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1TACTICAL UNMANNED AERIAL SYSTEM CAPABILITIES IMPACT ANALYSIS IN SUPPORT OF THE EXPEDITIONARY MARINE AIR GROUND TASK FORCE USING COMPUTER MODELING AND SIMULATION

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The Marine Corps of the future is one that will increasingly rely on unmanned aerial systems (UASs) integrating directly with Marines’ fire and maneuver. As UAS technology evolves, so, too, should the Marine Corps’ understanding and utilization of this technology in an increasingly complex operation environment evolve. The most powerful measure of effectiveness for the operational contributions of UASs is in Marine lives that the UAS helps to preserve. This research uses design of experiment principles and computer modeling to simulate a Marine Expeditionary Unit (MEU) conducting an amphibious assault against a peer-level adversary. Through a series of increasingly refined and focused experiments, a wide variety and range of UAS capabilities are explored to determine their impact on the Marines of that MEU. UAS capabilities explored include speed, stealth, air-to-ground missiles, ground support capability, and more. Through this analysis, sensor range and the number of UASs employed simultaneously are determined to be the most important UAS attributes in saving Marine lives. These factors are found to be more significant than armament, airspeed, stealth, or rate of detection.

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  • Title: ➤  TACTICAL UNMANNED AERIAL SYSTEM CAPABILITIES IMPACT ANALYSIS IN SUPPORT OF THE EXPEDITIONARY MARINE AIR GROUND TASK FORCE USING COMPUTER MODELING AND SIMULATION
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  • Language: English

“TACTICAL UNMANNED AERIAL SYSTEM CAPABILITIES IMPACT ANALYSIS IN SUPPORT OF THE EXPEDITIONARY MARINE AIR GROUND TASK FORCE USING COMPUTER MODELING AND SIMULATION” Subjects and Themes:

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2Analysis And Modeling Of The Virtual Human Interface For The MARG Body Tracking System Using Quaternions

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Mathematicians have used quaternions for about a hundred years. Today they are an important part of computer graphics and simulation systems. This thesis takes an analytical approach to quaternions by using them in the construction of a virtual human for sourceless Magnetic Accelerometer Rate Sensor (MARG) body tracking system. Virtual citizens will be a reflection of our personalities in cyberspace. Prophecies say they may take control in the virtual world and govern themselves too. One of the objectives of this thesis is to design a seamless and realistic humanoid from laser scan data clouds. This humanoid will be compatible with motion capture systems and networked virtual environments. Second objective of this thesis is to search for the answers related to the optimal real-time representation of an articulated virtual human, maintaining a high level of visual fidelity within networked cyberspace. While visual detail and fidelity have been and will continue to be a major ongoing interest within the computer graphics community, the idea of sourceless body tracking is still in its early stages. MARG body tracking is one of the successful approaches to body tracking systems. This thesis proposes a networked quaternion based real-time virtual human interface for the MARG body tracking system.

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3DTIC ADA489861: A Modeling And Simulation Approach To Analysis Of Stressors On Non-Line Of Sight Launch System (NLOS-LS) Control Cell Crew

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HUMAN CENTRIC NETWORK ENABLED BATTLE COMMAND. Part of the RDECOM MATREX Program * Focused on HPM/HBM of warfighters * Command Control and Communications Human Performance Model (C3HPM) * Historical Models * FCS SO1 NLOS-LS Modeling and Analysis.

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  • Title: ➤  DTIC ADA489861: A Modeling And Simulation Approach To Analysis Of Stressors On Non-Line Of Sight Launch System (NLOS-LS) Control Cell Crew
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4DTIC ADA454666: Study Of Experimental Aspects Of Dynamic Modeling And Control System Analysis Of Hovering Fights Of Eristalis Hoverflies

By

This is the final report for the project under Contract No. F61775-02-C4048. The main motivation for the project was to explore suitable theoretical and experimental approaches to characterise flight dynamics and control of insects, originally focusing on the hovering flight of Eristalis hoverflies. The study was soon re-scoped to investigate the desert locust Schistocerca gregaria. Although the locust is an interesting insect in its own right, there were two main motivations for this change of focus. Firstly, it proved prudent from the experimental viewpoint to work with the larger and more robust locust, thus allowing us to perfect the experimental set-up and techniques before proceeding to the smaller hoverflies. Secondly, although forward flight was not originally envisaged as forming part of the study, it quickly became apparent that the greatest difficulties in experimentation were those associated with forward flight, not hover. Simulating forward flight poses such a significant challenge but is so important to reverse engineering insect flight control that we elected to develop from the outset a system capable of simulating natural forward flight. This approach has thus allowed us not only to re-focus, but also to broaden the study.

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  • Title: ➤  DTIC ADA454666: Study Of Experimental Aspects Of Dynamic Modeling And Control System Analysis Of Hovering Fights Of Eristalis Hoverflies
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  • Language: English

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5NASA Technical Reports Server (NTRS) 20070018831: A Conceptual Aerospace Vehicle Structural System Modeling, Analysis And Design Process

By

A process for aerospace structural concept analysis and design is presented, with examples of a blended-wing-body fuselage, a multi-bubble fuselage concept, a notional crew exploration vehicle, and a high altitude long endurance aircraft. Aerospace vehicle structures must withstand all anticipated mission loads, yet must be designed to have optimal structural weight with the required safety margins. For a viable systems study of advanced concepts, these conflicting requirements must be imposed and analyzed early in the conceptual design cycle, preferably with a high degree of fidelity. In this design process, integrated multidisciplinary analysis tools are used in a collaborative engineering environment. First, parametric solid and surface models including the internal structural layout are developed for detailed finite element analyses. Multiple design scenarios are generated for analyzing several structural configurations and material alternatives. The structural stress, deflection, strain, and margins of safety distributions are visualized and the design is improved. Over several design cycles, the refined vehicle parts and assembly models are generated. The accumulated design data is used for the structural mass comparison and concept ranking. The present application focus on the blended-wing-body vehicle structure and advanced composite material are also discussed.

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  • Title: ➤  NASA Technical Reports Server (NTRS) 20070018831: A Conceptual Aerospace Vehicle Structural System Modeling, Analysis And Design Process
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  • Language: English

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6NASA Technical Reports Server (NTRS) 20020016718: Space Station Environmental Control And Life Support System Purge Control Pump Assembly Modeling And Analysis

By

Preliminary results from a thermal/flow analysis of the Purge Control Pump Assembly (PCPA) indicate that pump performance (mass flow rate) is enhanced via cooling of the housing and lowering of the inlet vapor quality. Under a nominal operational profile (25% duty cycle or less), at the maximum motor dissipation, it appears that the peristaltic tubing temperature will still remain significantly below the expected UPA condenser temperature (78 F max versus approximately 105 F in the condenser) permitting condensation in the pump head.

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7DTIC ADA403544: Analysis And Modeling Of The Virtual Human Interface For The MARG Body Tracking System Using Quaternions

By

Mathematicians have used quaternions for about a hundred years. Today they are an important part of computer graphics and simulation systems. This thesis takes an analytical approach to quaternions by using them in the construction of a virtual human for sourceless Magnetic Accelerometer Rate Sensor (MARG) body tracking system. Virtual citizens will be a reflection of our personalities in cyberspace. Prophecies say they may take control in the virtual world and govern themselves too. One of the objectives of this thesis is to design a seamless and realistic humanoid from laser scan data clouds. This humanoid will be compatible with notion capture systems and networked virtual environments. Second objective of this thesis is to search for the answers related to the optimal real-time representation of an articulated virtual human, maintaining a high level of visual fidelity within networked cyberspace. While visual detail and fidelity have been and will continue to be a major ongoing interest within the computer graphics community, the idea of sourceless body tracking is still in its early stages. MARG body tracking is one of the successful approaches to body tracking systems. This thesis proposes a networked quaternion based real-time virtual human interface for the MARG body tracking system.

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8DTIC ADA269782: The Development Of An Automated Cognitive Task Analysis And Modeling Process For Intelligent Tutoring System Development

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Studies have shown that 98% of students with private tutors do better than students in the traditional classroom. This has initiated research and the development of computerized intelligent tutoring systems based upon research related to cognitive learning and the communication of knowledge between a tutor and a student. Intelligent tutoring systems have demonstrated a 65% improvement in what can be learned in a given period of time as compared to traditional computer aided instruction in Navy tasks. The principle component of these computerized tutors is a model of the knowledge which makes up the cognitive task to be learned by a student. Creating these cognitive models requires an extensive analysis of the task knowledge. This process is expensive yet critical to the success of these tutors. This research has produced a software tool which interacts with a subject matter expert and conducts an analysis of his/her knowledge, building the needed cognitive task model for use in intelligent tutoring system development. An evaluation of the system was conducted to determine the degree of variation in models generated by experts on a specific highly proceduralized task. The subject generated models were also compared to a model generated by a cognitive analyst. The results demonstrated a high degree of consistency in the models developed between subjects although subjects tended to organize their knowledge of procedures into units of differing size. Cognitive task analysis, Cognitive simulation modeling intelligent tutoring systems, GOMS, Human systems interaction transfer of training, Training time prediction.

“DTIC ADA269782: The Development Of An Automated Cognitive Task Analysis And Modeling Process For Intelligent Tutoring System Development” Metadata:

  • Title: ➤  DTIC ADA269782: The Development Of An Automated Cognitive Task Analysis And Modeling Process For Intelligent Tutoring System Development
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  • Language: English

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9NASA Technical Reports Server (NTRS) 19780006635: Multispectral System Analysis Through Modeling And Simulation

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The design and development of multispectral remote sensor systems and associated information extraction techniques should be optimized under the physical and economic constraints encountered and yet be effective over a wide range of scene and environmental conditions. Direct measurement of the full range of conditions to be encountered can be difficult, time consuming, and costly. Simulation of multispectral data by modeling scene, atmosphere, sensor, and data classifier characteristics is set forth as a viable alternative, particularly when coupled with limited sets of empirical measurements. A multispectral system modeling capability is described. Use of the model is illustrated for several applications - interpretation of remotely sensed data from agricultural and forest scenes, evaluating atmospheric effects in LANDSAT data, examining system design and operational configuration, and development of information extraction techniques.

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  • Title: ➤  NASA Technical Reports Server (NTRS) 19780006635: Multispectral System Analysis Through Modeling And Simulation
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  • Language: English

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10Modeling And Dynamic Analysis Of Multi Spool Rotor System

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Book Source: Digital Library of India Item 2015.199022 dc.date.accessioned: 2015-07-08T13:03:24Z dc.date.available: 2015-07-08T13:03:24Z dc.date.digitalpublicationdate: 2005-08-27 dc.identifier.barcode: 5990010101435 dc.identifier.origpath: /rawdataupload/upload/0101/437 dc.identifier.copyno: 1 dc.identifier.uri: http://www.new.dli.ernet.in/handle/2015/199022 dc.description.scannerno: 14 dc.description.scanningcentre: IIIT, Allahabad dc.description.main: 1 dc.description.tagged: 0 dc.description.totalpages: 132 dc.format.mimetype: application/pdf dc.language.iso: English dc.publisher: Indian Institute Of Technology Kanpur dc.rights: Out_of_copyright dc.source.library: Indian Institute Of Technology Kanpur dc.title: Modeling And Dynamic Analysis Of Multi Spool Rotor System

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11DTIC ADA205674: A User's Guide To The Molecular Modeling, Analysis And Display System (MMADS)

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The Molecular Modeling, Analysis, and Display System (MMADS) provides a chemist's workbench - a users-friendly, integrated suite of programs organized around a common data structure. The guiding principle throughout the development of MMADS has been to provide the user with the largest practical number of programs in an environment conducive to their use. With MMADS, a tool has been constructed that incorporates application programs for quantum, physical, and physical organic chemistry, as well as state-of-the-art molecular graphics routines, in a coherent whole. Molecular modeling, Computational chemistry, Quantitative structure, Activity relationships, Molecular graphics, Quantum chemistry.

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  • Title: ➤  DTIC ADA205674: A User's Guide To The Molecular Modeling, Analysis And Display System (MMADS)
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  • Language: English

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12ERIC ED032994: System Analysis, Program Development, And Cost-Effectiveness Modeling Of Indian Education For The Bureau Of Indian Affairs. Volume V, Appendices.

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Sample forms are presented for interview information obtained from teachers, administrators, students, guidance counselors, and dormitory staff personnel in Bureau of Indian Affairs schools, from parents of Indian students, and from community leaders. A classroom observation guide and checklists for dormitory and school facilities, curriculum and school services, and school atmosphere are included. Two educational planning games are presented which reflect teacher and student preferences and priorities. A section on program descriptions includes the problem which a program seeks to alleviate and the rationale for the program with specific information on pilot programs in operation. Management report forms, a cost-effectiveness model, and bibliographic citations are also included. Related documents are RC 003 749, RC 003 750, and RC 003 751. [Not available in hard copy due to marginal legibility of original document. (JH)

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13Dynamic System Identification And Modeling Of A Rotary Wing UAV For Stability And Control Analysis

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This thesis presents a method for the dynamic system identification and simulation model development of a small rotary wing UAV. Using aerodynamic parameterization and linear state-space modeling techniques, the Bergen Industrial UAV was modeled for computer simulation to analyze its inherent stability and control characteristics. The NPS designed JANRAD software was utilized to determine the stability and control derivatives used in the simulation model. The identification of the UAV dynamic model will aid in the development of closed-loop controllers capable of autonomous UAV control. The fidelity of the simulation model was verified by comparing the simulation responses with data collected from on-board sensors during test flight

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14DTIC ADA570834: Modeling Terrorism Risk To The Air Transportation System: An Independent Assessment Of TSA's Risk Management Analysis Tool And Associated Methods

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In establishing the Department of Homeland Security (DHS) in 2002, Congress directed DHS to develop risk-management principles for protecting critical infrastructure sectors such as transportation. This requirement was elaborated by Homeland Security Presidential Directive 7, the National Infrastructure Protection Plan, and other legislation and policies. These highlighted the importance of developing reliable and valid assessments of security risks that account systematically for the threats, vulnerabilities, and consequences to which transportation systems and other critical infrastructure are exposed. Early DHS and Transportation Security Administration (TSA) risk-analysis efforts revealed the complexity of critical infrastructure risks when threats involve intelligent adversaries who may adapt to security countermeasures and whose number, location, and intentions are poorly known. Tools such as the Risk Analysis and Management for Critical Asset Protection and TSA s National Transportation Sector Risk Analysis were soon abandoned because of the challenges of accurately measuring key inputs, such as the likelihoods of different attack scenarios and the expected direct and indirect consequences of successful attacks.

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15DTIC ADA465613: Multi-Scale Behavioral Modeling And Analysis Promoting A Fundamental Understanding Of Agent-Based System Design And Operation

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This research project used a combination of theory and experimentation to advance both the design methods and delivered functionality of Multi-Agent Systems in the context of military-relevant problem domains. The experiments conducted tested new theories about how systems of agents acting as distributed decision-makers should: (1) reorganize by allocating decision-making control to maximize system performance, (2) assess the trustworthiness of information by determining the level of information uncertainty and reliability of information source, and (3) coordinate by exchanging their preferences for actions under varying organizations and situations.

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16NASA Technical Reports Server (NTRS) 19960022226: Modeling And Analysis Of The DSS-14 Antenna Control System

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An improvement of pointing precision of the DSS-14 antenna is planned for the near future. In order to analyze the improvement limits and to design new controllers, a precise model of the antenna and the servo is developed, including a finite element model of the antenna structure and detailed models of the hydraulic drives and electronic parts. The DSS-14 antenna control system has two modes of operation: computer mode and precision mode. The principal goal of this investigation is to develop the model of the computer mode and to evaluate its performance. The DSS-14 antenna computer model consists of the antenna structure and drives in azimuth and elevation. For this model, the position servo loop is derived, and simulations of the closed-loop antenna dynamics are presented. The model is significantly different from that for the 34-m beam-waveguide antennas.

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17NASA Technical Reports Server (NTRS) 20120000079: Air Force Reusable Booster System: A Quick-look, Design Focused Modeling And Cost Analysis Study

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This paper presents a method and an initial analysis of the costs of a reusable booster system (RBS) as envisioned by the US Department of Defense (DoD) and numerous initiatives that form the concept of Operationally Responsive Space (ORS). This paper leverages the knowledge gained from decades of experience with the semi-reusable NASA Space Shuttle to understand how the costs of a military next generation semi-reusable space transport might behave in the real world - and how it might be made as affordable as desired. The NASA Space Shuttle had a semi-expendable booster, that being the reusable Solid Rocket MotorslBoosters (SRMlSRB) and the expendable cryogenic External Tank (ET), with a reusable cargo and crew capable orbiter. This paper will explore DoD concepts that invert this architectural arrangement, using a reusable booster plane that flies back to base soon after launch, with the in-space elements of the launch system being the expendable portions. Cost estimating in the earliest stages of any potential, large scale program has limited usefulness. As a result, the emphasis here is on developing an approach, a structure, and the basic concepts that could continue to be matured as the program gains knowledge. Where cost estimates are provided, these results by necessity carry many caveats and assumptions, and this analysis becomes more about ways in which drivers of costs for diverse scenarios can be better understood. The paper is informed throughout with a design-for-cost philosophy whereby the design and technology features of the proposed RBS (who and what, the "architecture") are taken as linked at the hip to a desire to perform a certain mission (where and when), and together these inform the cost, responsiveness, performance and sustainability (how) of the system. Concepts for developing, acquiring, producing or operating the system will be shown for their inextricable relationship to the "architecture" of the system, and how these too relate to costs. Design and technology features bear special relevance to early program research and development directions. Given the uncertainties involved in both their actual performance promise and their relation to costs of operational systems, this later relationship is also given special attention.

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18NASA Technical Reports Server (NTRS) 20110005491: Parametric Mass Modeling For Mars Entry, Descent And Landing System Analysis Study

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This paper provides an overview of the parametric mass models used for the Entry, Descent, and Landing Systems Analysis study conducted by NASA in FY2009-2010. The study examined eight unique exploration class architectures that included elements such as a rigid mid-L/D aeroshell, a lifting hypersonic inflatable decelerator, a drag supersonic inflatable decelerator, a lifting supersonic inflatable decelerator implemented with a skirt, and subsonic/supersonic retro-propulsion. Parametric models used in this study relate the component mass to vehicle dimensions and mission key environmental parameters such as maximum deceleration and total heat load. The use of a parametric mass model allows the simultaneous optimization of trajectory and mass sizing parameters.

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19Mathematical Modeling And System Analysis Of Cattle Feedlot Runoff

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This volume was digitized and made accessible online due to deterioration of the original print copy.

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20DTIC ADA354423: Dynamic Modeling Of The Polaris Sportsman 500 ATV Using Dynamic Analysis And Design System (DADS).

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A dynamic model of the Polaris Sportsman 500 All-Terrain Vehicle (ATV) was built using Dynamic Analysis and Design System (DADS) version 8.5. Aspects of the model included the front MacPherson struts and rear independent suspension. The model also allowed control over the path and speed of the vehicle using the DADS control elements. The modeling methods discussed here are general in nature and may be applied to other DADS vehicle models of similar systems. This report also provides a usefull reference source to those using this model.

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21ERIC ED032993: System Analysis, Program Development, And Cost-Effectiveness Modeling Of Indian Education For The Bureau Of Indian Affairs. Volume IV, Internal School Models.

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Models for planned changes in schools are presented in this document and are aimed at increasing student achievement and satisfaction. Following a brief introduction which highlights a challenge for effective change and some suggested procedures for implementing the models, each model is presented in detail. The four models are: (1) The School Process Model, (2) The Teacher Evaluation Model, (3) The Curriculum Evaluation Model, and (4) The Instructional Process Model. The models are complete and show all phases and related materials for each. Included are flow charts within the models plus a chart showing the working relationship of the models to each other and their relationship to the entire elementary and secondary school program. Related documents are RC 003 749, RC 003 750, and RC 003 752. (DB)

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22NASA Technical Reports Server (NTRS) 20160013836: Evaluation Of Contamination Inspection And Analysis Methods Through Modeling System Performance

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Contamination is usually identified as a risk on the risk register for sensitive space systems hardware. Despite detailed, time-consuming, and costly contamination control efforts during assembly, integration, and test of space systems, contaminants are still found during visual inspections of hardware. Improved methods are needed to gather information during systems integration to catch potential contamination issues earlier and manage contamination risks better. This research explores evaluation of contamination inspection and analysis methods to determine optical system sensitivity to minimum detectable molecular contamination levels based on IEST-STD-CC1246E non-volatile residue (NVR) cleanliness levels. Potential future degradation of the system is modeled given chosen modules representative of optical elements in an optical system, minimum detectable molecular contamination levels for a chosen inspection and analysis method, and determining the effect of contamination on the system. By modeling system performance based on when molecular contamination is detected during systems integration and at what cleanliness level, the decision maker can perform trades amongst different inspection and analysis methods and determine if a planned method is adequate to meet system requirements and manage contamination risk.

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23NASA Technical Reports Server (NTRS) 19760014117: Modeling And Analysis Of The TF30-P-3 Compressor System With Inlet Pressure Distortion

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Circumferential inlet distortion testing of a TF30-P-3 afterburning turbofan engine was conducted at NASA-Lewis Research Center. Pratt and Whitney Aircraft analyzed the data using its multiple segment parallel compressor model and classical compressor theory. Distortion attenuation analysis resulted in a detailed flow field calculation with good agreement between multiple segment model predictions and the test data. Sensitivity of the engine stall line to circumferential inlet distortion was calculated on the basis of parallel compressor theory to be more severe than indicated by the data. However, the calculated stall site location was in agreement with high response instrumentation measurements.

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24ERIC ED180443: The Financial Analysis System: An Integrated Software System For Financial Analysis And Modeling.

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This paper discusses the Financial Analysis System (FAS), a software system for financial analysis, display, and modeling of the data found in the COMPUSTAT Annual Industrial, Over-the-Counter and Canadian Company files. The educational utility of FAS is also discussed briefly. (Author)

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25DTIC ADA530143: Integrating System Dynamics Modeling And Knowledge Value Added For Improved Analysis Of Alternatives: A Proof Of Concept Study

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Effective and efficient DoD acquisition programs require the analysis of a wide range of materiel alternatives. Alternative diversity, difficulties in selecting metrics and measuring performance, and other factors make the Analysis of Alternatives (AoA) difficult. The benefits of alternatives should be included in AoA, but cost estimates predominate most AoA processes. Incorporating benefits into AoA is particularly difficult because of the intangible nature of many important benefits. The current work addresses the need to improve the use of benefits in AoA by building a system dynamics model of a military operation and integrating it with the Knowledge Value Added (KVA) methodology. The synergies may be able to significantly improve the accuracy of KVA estimates in the AoA process. A notional mobile weapon system was modeled and calibrated to reflect four weaponized Unmanned Aerial Vehicles (UAV). Modeling a hypothetical AoA for upgrading one of the UAV indicated that there were potentially significant synergies that can increase the number of alternatives that could be analyzed, establishing common units of benefit estimates for an AoA, improved reliability of an AoA, and improved justification of AoA results. These can improve alternative selection, thereby improving final materiel effectiveness, thereby improving DoD acquisition processes.

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26NASA Technical Reports Server (NTRS) 20130014755: Comprehensive Modeling And Analysis Of Rotorcraft Variable Speed Propulsion System With Coupled Engine/Transmission/Rotor Dynamics

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This project develops comprehensive modeling and simulation tools for analysis of variable rotor speed helicopter propulsion system dynamics. The Comprehensive Variable-Speed Rotorcraft Propulsion Modeling (CVSRPM) tool developed in this research is used to investigate coupled rotor/engine/fuel control/gearbox/shaft/clutch/flight control system dynamic interactions for several variable rotor speed mission scenarios. In this investigation, a prototypical two-speed Dual-Clutch Transmission (DCT) is proposed and designed to achieve 50 percent rotor speed variation. The comprehensive modeling tool developed in this study is utilized to analyze the two-speed shift response of both a conventional single rotor helicopter and a tiltrotor drive system. In the tiltrotor system, both a Parallel Shift Control (PSC) strategy and a Sequential Shift Control (SSC) strategy for constant and variable forward speed mission profiles are analyzed. Under the PSC strategy, selecting clutch shift-rate results in a design tradeoff between transient engine surge margins and clutch frictional power dissipation. In the case of SSC, clutch power dissipation is drastically reduced in exchange for the necessity to disengage one engine at a time which requires a multi-DCT drive system topology. In addition to comprehensive simulations, several sections are dedicated to detailed analysis of driveline subsystem components under variable speed operation. In particular an aeroelastic simulation of a stiff in-plane rotor using nonlinear quasi-steady blade element theory was conducted to investigate variable speed rotor dynamics. It was found that 2/rev and 4/rev flap and lag vibrations were significant during resonance crossings with 4/rev lagwise loads being directly transferred into drive-system torque disturbances. To capture the clutch engagement dynamics, a nonlinear stick-slip clutch torque model is developed. Also, a transient gas-turbine engine model based on first principles mean-line compressor and turbine approximations is developed. Finally an analysis of high frequency gear dynamics including the effect of tooth mesh stiffness variation under variable speed operation is conducted including experimental validation. Through exploring the interactions between the various subsystems, this investigation provides important insights into the continuing development of variable-speed rotorcraft propulsion systems.

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27Cost Analysis For Aircraft System Test And Evaluation: Empirical Survey Data Structuring And Parameteric Modeling

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There is an increasing requirement from high levels within the Government that the Navy's aircraft cost estimators and analysts provide explicit estimates for the sub-elements of Aircraft System Test and Evaluation (AST&E) efforts. The data required to produce more accurate and detailed estimates represent lower levels in the Aircraft Work Breakdown Structure (WBS) than previously available. This is a two volume thesis. Volume I examines the WBS and Contractor Cost Data Reporting (CCDR) system with a description of current reporting practices and implementation shortcomings. Recommended courses of action to improve reporting requirements and thereby improve data quality and cost estimates are proposed. Major cost drivers for AST&E, from both the perspective of Defense Contractors and Military Flight Test Centers, are discussed. Beginning in Volume II, a relational data base system is introduced to more easily evaluate AST&E cost elements and physical/performance characteristics. A Contractor Flight Test cost estimating relationship (CER) is developed through step-wise multiple regression analysis of data gathered from Defense Contractors and Naval Air Systems Command (NAVAIR).

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28DTIC AD1026108: A Model-Based Systems Engineering Methodology For Employing Architecture In System Analysis: Developing Simulation Models Using Systems Modeling Language Products To Link Architecture And Analysis

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This dissertation contributes to model-based systems engineering (MBSE) by formally defining an MBSE methodology for employing architecture in system analysis (MEASA) that presents a comprehensive framework detailing the relationship between system architecture products and external models and simulations used to analyze system performance and feasibility. Specifically, the research combines the use of Systems Modeling Language (SysML) products and operational simulation models to support assessment of system requirements for systems engineering. The MBSE MEASA transforms operational needs into preferred system configurations through the analysis of detailed simulation models. The research does this by using designed experiments to generate architecture tradespace visualizations that highlight the impact that system design parameters, system-environment interactions, system operational implementation, and system component interactions have on system performance. The research demonstrates a procedure for iterations of the methodology when analysis suggests potentially impactful design, operational, or environmental variables (as well as potential interactions between those variables). The research develops and analyzes notional architecture products and simulation models of United States Navy mine warfare systems to demonstrate an application of the MBSE MEASA.

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29DTIC ADA268070: System Performance Modeling And Analysis Of A Fault-Tolerant, Real Time Parallel Processor

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The use of fault-tolerant, real-time systems for the control of life- critical processes is becoming increasingly common, with examples including flight and nuclear reactor control systems. In such systems, the overhead associated with managing redundancy, communication, and task scheduling is critical due to real-time constraints imposed by the application; missed time deadlines can be viewed as system failures, with results as consequential as hardware failures. The Fault-Tolerant Parallel Processor (FTPP) was developed by Draper Laboratory as a fault-tolerant, real-time computing platform. This thesis analyzes the FTPP prototype operating system overhead through the use of empirical performance measurement and two performance models based on these measurements. One model is developed to predict the operating system overhead under various configurations and workloads; accurate prediction of overhead provides confidence that real-time constraints can be satisfied. Because the system communication overhead may vary depending upon the amount of contention by Processing Elements for service by the Network Element, a second model is developed to account for performance delays that may result from this contention. When such performance analysis and modeling are an integral part of a concurrent build-analyze-improve methodology, performance bottlenecks can be cost effectively removed at an early stage in development.

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30DTIC ADA410703: Dynamic Analysis And Design System Modeling Of The Experimental Unmanned Vehicle

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The Weapons Analysis Branch, Ballistics and Weapons Concepts Division, Weapons and Materials Research Directorate of the U.S. Army Research Laboratory (ARL) built a multi-body engineering-level model of the unmanned ground vehicle platform used in the Office of the Secretary of Defense Demo III Robotics program during fiscal years 2000 and 2001. The intended role of the autonomous robotic vehicle was to be a technology demonstrator to assess the possibility of an unmanned vehicle performing the armor scout mission. The unaided vehicle would travel ahead of the troop section and provide scout reconnaissance without the need for placing a human being into a hostile environment. The vehicle platform used as the basis for the model was the experimental unmanned vehicle (XUV) developed and built by General Dynamics Robotic Systems (GDRS). The XUV is a four-wheeled, Ackerman-steered, all-wheel-drive autonomous vehicle that is approximately 10 feet long, 5 feet wide, and 4 feet high and has a curb weight of=3000 pounds. The XUV uses a four-cylinder, 78-hp diesel engine that powers a four-wheel hydraulic drive system. A computer model of the XUV was subsequently developed as a further extension of the modeling tools used for analyzing robotic vehicle off-highway mobility and chassis dynamics and to further enhance the fidelity of battlefield simulations in which these vehicles are employed. The XUV is shown in Figure 1 and the XUV with revised body structure is shown in Figure 2.

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31Dynamic Modeling And Analysis Of A Remote Hybrid Power System With Pumped Hydro Storage

In this research, dynamic modeling of a remote hybrid power system and feasibility of a pumped hydro storage system is presented. Current hybrid system in Ramea, Newfoundland has an electrolyzer, storage and hydrogen generator system. This research proposes a pumped hydro storage as a replacement to the hydrogen system. Detailed MATLAB‐Simulink modeling has been done for every component of the Ramea hybrid power system. Incorporation of a pumped hydro system and some lead acid batteries will eliminate the low turn around efficiency of the electrolyzer and hydrogen generator system. The system dynamic model presented here is fast, accurate and includes dynamic and supervisory controllers. The proposed real time supervisory controller algorithm observes the available surplus/missing power in the system and regulates pump/turbine and charging/discharging of the battery bank to maintain a stable system frequency. This paper presents dynamic model, supervisory controller design and algorithm, six case studies and detailed simulation results.

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  • Title: ➤  Dynamic Modeling And Analysis Of A Remote Hybrid Power System With Pumped Hydro Storage
  • Language: English

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32Development Computer System Of Modeling And Analysis Of Poincare Sections

By

In the present papers of an envelope of a surface with the help of the designed multifunction interactive computer system working in a mode of substantial calculations are prolonged initiated in [1-4]. By development of the computer system such composite computational problems, as are decided: a numerical integration of equations of motion at the arbitrary initial conditions and parameters, construction of phase sections of integral varieties and their projections, construction of phase trajectories and an envelope of a surface, visualization of conduct, conservation - loading of large scale arrays of data, etc. The Introduced program ministers the universal tool for study of some other dynamic systems. 

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  • Title: ➤  Development Computer System Of Modeling And Analysis Of Poincare Sections
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33ERIC ED591953: Engaging All Readers Through Explorations Of Literacy, Language, And Culture. The Fortieth Yearbook: A Double Peer-Reviewed Publication Of The Association Of Literacy Educators And Researchers For Their 61st Annual Conference, The Association Of Literacy Educators And Researchers (ALER) Met In St. Petersburg, Florida. This Year's Conference Theme Was "Engaging All Readers Through Explorations Of Literacy, Language, And Culture," Which Was Also Used As The Title For This Year's "Yearbook." This "Yearbook" Contains Articles About Innovative Strategies For Teachers And Teacher Leaders, Research Trends Within Teacher Education Programs, And Innovative And Seminal Strategies For Preservice Teachers. Included Are Double-peer Reviewed Papers, The Presidential Address, And The Keynote Address: (1) Systems Without A Process: Know What To Do And Then Do It Well (David D. Paige); (2) Reclaiming Creative Literacy Practices (Thomas W. Bean); (3) Understanding Reasoning And Academic Language In Economics (Chang Yuan); (4) "There Might Be Words On The Screen, But It's Not The Same": Engaging Tweens In Literacy Through Minecraft Book Groups (Carolyn Stufft); (5) Stranger Than Nonfiction: Identifying And Modeling Text Structures In Fiction Picturebooks (Tracey S. Hodges And Sharon D. Matthews); (6) "Es Lo Que Hacemos"/It's What We Do: Translanguaging To Make Meaning During Read Alouds (Erin Greeter); (7) Research On Reader's Theater (Faida Stokes And Chase Young); (8) What DO They Do All Day?: Field Experiences In Literacy Coaching (Katherine Brodeur, Susan Massey, Lisa Ortmann, And Cynthia Bertelsen); (9) The Engaged Learning Model: The Impact Of Digital Literacy And Problem-Based Learning On Fourth Graders' Vocabulary And General Reading Outcomes (James E. Gentry, Chris Sloan, And Robin Pate); (10) Teachers Implementing Coaching Mindsets: A Path To Literacy Leadership (Aimee Morewood, Susan Taylor, Julie Ankrum, Allison Swan Dagen, And Angela Curfman); (11) High Stakes Testing In Teacher Education: Responses And Implications (Maryann Mraz, Bob Rickelman, S. Michael Putman, Paola Pilonieta, And Jean Vintinner); (12) The Lasting Impact Of A University Common Reading Program (Kristen Ferguson, Natalya Brown, And Linda Piper); (13) Honoring All Of The Language Arts: A Constructivist Approach To Preservice Teachers' Classroom Observations (Delane Bender-Slack And Teresa Young); (14) Preservice Teachers' Sense Of Efficacy For Literacy Instruction: Examination Of An Undergraduate Delivery System (Corinne Valadez, Tomas Espinosa, Johnathan Hill, And Maureen Sullivan); (15) Cohort Participation: Impact On Personal Learning Networks (Caryssa K. Retrum, Elizabeth Alderton, Glady Van Harpen, And Stephanie Bernander); (16) Disrupting The University Curriculum: Engaging Preservice Teachers In A Study Abroad "Passport" Activity (Virginia R. Massaro, Joan A. Rhodes, And Sharon Zumbrunn); (17) "If You're Not Reading, You're Not Growing": Exploring The Reading Habits Of Preservice Teachers In A Children's Literature Course (Bethanie Pletcher And Tomas Espinosa); (18) Shaping And Being Shaped: Exploring Preservice Teachers' Literacy Autobiographies (Stacey J. Korson And Connie Beckner Hodge); (19) Supporting Literacy Teaching Through Rehearsal (Nicholas Husbye); (20) Phonics And Phonemic Awareness In A Teacher Preparation Program: An Analysis Of The Achievement And Perceptions Of Pre-Service Teachers (Stacey Bose); (21) The Power Of Family Involvement: Preparing Preservice Teachers To Understand More About The Out Of School Literacy Lives And Cultures Of Children (Kathryn V. Dixon, Martha M. Foote, And Juan J. Araujo With Rhonda Clark, Carol Revelle, And Tami Morton); (22) Supporting The Literacy Development Of At-Risk First Time College Students Through The Exploration Of Language And Culture (Connie Briggs, Patricia A. Watson, And Ivan Dole); And (23) Exploring The Reading Strategy Use Of EFL College Students: Tri-lingual Chinese Students Attending A University In Korea (Kay Hong-Nam And Susan Szabo). [For The Thirty-Ninth Yearbook, See ED594524.]

By

For their 61st annual conference, the Association of Literacy Educators and Researchers (ALER) met in St. Petersburg, Florida. This year's conference theme was "Engaging All Readers through Explorations of Literacy, Language, and Culture," which was also used as the title for this year's "Yearbook." This "Yearbook" contains articles about innovative strategies for teachers and teacher leaders, research trends within teacher education programs, and innovative and seminal strategies for preservice teachers. Included are double-peer reviewed papers, the presidential address, and the keynote address: (1) Systems Without a Process: Know What To Do and Then Do It Well (David D. Paige); (2) Reclaiming Creative Literacy Practices (Thomas W. Bean); (3) Understanding Reasoning and Academic Language in Economics (Chang Yuan); (4) "There Might Be Words on the Screen, but it's Not the Same": Engaging Tweens in Literacy through Minecraft Book Groups (Carolyn Stufft); (5) Stranger than Nonfiction: Identifying and Modeling Text Structures in Fiction Picturebooks (Tracey S. Hodges and Sharon D. Matthews); (6) "Es Lo Que Hacemos"/It's What We Do: Translanguaging to Make Meaning During Read Alouds (Erin Greeter); (7) Research on Reader's Theater (Faida Stokes and Chase Young); (8) What DO they do all day?: Field Experiences in Literacy Coaching (Katherine Brodeur, Susan Massey, Lisa Ortmann, and Cynthia Bertelsen); (9) The Engaged Learning Model: The Impact of Digital Literacy and Problem-Based Learning on Fourth Graders' Vocabulary and General Reading Outcomes (James E. Gentry, Chris Sloan, and Robin Pate); (10) Teachers Implementing Coaching Mindsets: A Path to Literacy Leadership (Aimee Morewood, Susan Taylor, Julie Ankrum, Allison Swan Dagen, and Angela Curfman); (11) High Stakes Testing in Teacher Education: Responses and Implications (Maryann Mraz, Bob Rickelman, S. Michael Putman, Paola Pilonieta, and Jean Vintinner); (12) The Lasting Impact of a University Common Reading Program (Kristen Ferguson, Natalya Brown, and Linda Piper); (13) Honoring All of the Language Arts: A Constructivist Approach to Preservice Teachers' Classroom Observations (Delane Bender-Slack and Teresa Young); (14) Preservice Teachers' Sense of Efficacy for Literacy Instruction: Examination of an Undergraduate Delivery System (Corinne Valadez, Tomas Espinosa, Johnathan Hill, and Maureen Sullivan); (15) Cohort Participation: Impact on Personal Learning Networks (Caryssa K. Retrum, Elizabeth Alderton, Glady Van Harpen, and Stephanie Bernander); (16) Disrupting the University Curriculum: Engaging Preservice Teachers in a Study Abroad "Passport" Activity (Virginia R. Massaro, Joan A. Rhodes, and Sharon Zumbrunn); (17) "If You're Not Reading, You're Not Growing": Exploring the Reading Habits of Preservice Teachers in a Children's Literature Course (Bethanie Pletcher and Tomas Espinosa); (18) Shaping and Being Shaped: Exploring Preservice Teachers' Literacy Autobiographies (Stacey J. Korson and Connie Beckner Hodge); (19) Supporting Literacy Teaching Through Rehearsal (Nicholas Husbye); (20) Phonics and Phonemic Awareness in a Teacher Preparation Program: An Analysis of the Achievement and Perceptions of Pre-Service Teachers (Stacey Bose); (21) The Power of Family Involvement: Preparing Preservice Teachers to Understand More about the Out of School Literacy Lives and Cultures of Children (Kathryn V. Dixon, Martha M. Foote, and Juan J. Araujo with Rhonda Clark, Carol Revelle, and Tami Morton); (22) Supporting the Literacy Development of At-Risk First Time College Students through the Exploration of Language and Culture (Connie Briggs, Patricia A. Watson, and Ivan Dole); and (23) Exploring the Reading Strategy Use of EFL College Students: Tri-lingual Chinese Students Attending a University in Korea (Kay Hong-Nam and Susan Szabo). [For the Thirty-Ninth Yearbook, see ED594524.]

“ERIC ED591953: Engaging All Readers Through Explorations Of Literacy, Language, And Culture. The Fortieth Yearbook: A Double Peer-Reviewed Publication Of The Association Of Literacy Educators And Researchers For Their 61st Annual Conference, The Association Of Literacy Educators And Researchers (ALER) Met In St. Petersburg, Florida. This Year's Conference Theme Was "Engaging All Readers Through Explorations Of Literacy, Language, And Culture," Which Was Also Used As The Title For This Year's "Yearbook." This "Yearbook" Contains Articles About Innovative Strategies For Teachers And Teacher Leaders, Research Trends Within Teacher Education Programs, And Innovative And Seminal Strategies For Preservice Teachers. Included Are Double-peer Reviewed Papers, The Presidential Address, And The Keynote Address: (1) Systems Without A Process: Know What To Do And Then Do It Well (David D. Paige); (2) Reclaiming Creative Literacy Practices (Thomas W. Bean); (3) Understanding Reasoning And Academic Language In Economics (Chang Yuan); (4) "There Might Be Words On The Screen, But It's Not The Same": Engaging Tweens In Literacy Through Minecraft Book Groups (Carolyn Stufft); (5) Stranger Than Nonfiction: Identifying And Modeling Text Structures In Fiction Picturebooks (Tracey S. Hodges And Sharon D. Matthews); (6) "Es Lo Que Hacemos"/It's What We Do: Translanguaging To Make Meaning During Read Alouds (Erin Greeter); (7) Research On Reader's Theater (Faida Stokes And Chase Young); (8) What DO They Do All Day?: Field Experiences In Literacy Coaching (Katherine Brodeur, Susan Massey, Lisa Ortmann, And Cynthia Bertelsen); (9) The Engaged Learning Model: The Impact Of Digital Literacy And Problem-Based Learning On Fourth Graders' Vocabulary And General Reading Outcomes (James E. Gentry, Chris Sloan, And Robin Pate); (10) Teachers Implementing Coaching Mindsets: A Path To Literacy Leadership (Aimee Morewood, Susan Taylor, Julie Ankrum, Allison Swan Dagen, And Angela Curfman); (11) High Stakes Testing In Teacher Education: Responses And Implications (Maryann Mraz, Bob Rickelman, S. Michael Putman, Paola Pilonieta, And Jean Vintinner); (12) The Lasting Impact Of A University Common Reading Program (Kristen Ferguson, Natalya Brown, And Linda Piper); (13) Honoring All Of The Language Arts: A Constructivist Approach To Preservice Teachers' Classroom Observations (Delane Bender-Slack And Teresa Young); (14) Preservice Teachers' Sense Of Efficacy For Literacy Instruction: Examination Of An Undergraduate Delivery System (Corinne Valadez, Tomas Espinosa, Johnathan Hill, And Maureen Sullivan); (15) Cohort Participation: Impact On Personal Learning Networks (Caryssa K. Retrum, Elizabeth Alderton, Glady Van Harpen, And Stephanie Bernander); (16) Disrupting The University Curriculum: Engaging Preservice Teachers In A Study Abroad "Passport" Activity (Virginia R. Massaro, Joan A. Rhodes, And Sharon Zumbrunn); (17) "If You're Not Reading, You're Not Growing": Exploring The Reading Habits Of Preservice Teachers In A Children's Literature Course (Bethanie Pletcher And Tomas Espinosa); (18) Shaping And Being Shaped: Exploring Preservice Teachers' Literacy Autobiographies (Stacey J. Korson And Connie Beckner Hodge); (19) Supporting Literacy Teaching Through Rehearsal (Nicholas Husbye); (20) Phonics And Phonemic Awareness In A Teacher Preparation Program: An Analysis Of The Achievement And Perceptions Of Pre-Service Teachers (Stacey Bose); (21) The Power Of Family Involvement: Preparing Preservice Teachers To Understand More About The Out Of School Literacy Lives And Cultures Of Children (Kathryn V. Dixon, Martha M. Foote, And Juan J. Araujo With Rhonda Clark, Carol Revelle, And Tami Morton); (22) Supporting The Literacy Development Of At-Risk First Time College Students Through The Exploration Of Language And Culture (Connie Briggs, Patricia A. Watson, And Ivan Dole); And (23) Exploring The Reading Strategy Use Of EFL College Students: Tri-lingual Chinese Students Attending A University In Korea (Kay Hong-Nam And Susan Szabo). [For The Thirty-Ninth Yearbook, See ED594524.]” Metadata:

  • Title: ➤  ERIC ED591953: Engaging All Readers Through Explorations Of Literacy, Language, And Culture. The Fortieth Yearbook: A Double Peer-Reviewed Publication Of The Association Of Literacy Educators And Researchers For Their 61st Annual Conference, The Association Of Literacy Educators And Researchers (ALER) Met In St. Petersburg, Florida. This Year's Conference Theme Was "Engaging All Readers Through Explorations Of Literacy, Language, And Culture," Which Was Also Used As The Title For This Year's "Yearbook." This "Yearbook" Contains Articles About Innovative Strategies For Teachers And Teacher Leaders, Research Trends Within Teacher Education Programs, And Innovative And Seminal Strategies For Preservice Teachers. Included Are Double-peer Reviewed Papers, The Presidential Address, And The Keynote Address: (1) Systems Without A Process: Know What To Do And Then Do It Well (David D. Paige); (2) Reclaiming Creative Literacy Practices (Thomas W. Bean); (3) Understanding Reasoning And Academic Language In Economics (Chang Yuan); (4) "There Might Be Words On The Screen, But It's Not The Same": Engaging Tweens In Literacy Through Minecraft Book Groups (Carolyn Stufft); (5) Stranger Than Nonfiction: Identifying And Modeling Text Structures In Fiction Picturebooks (Tracey S. Hodges And Sharon D. Matthews); (6) "Es Lo Que Hacemos"/It's What We Do: Translanguaging To Make Meaning During Read Alouds (Erin Greeter); (7) Research On Reader's Theater (Faida Stokes And Chase Young); (8) What DO They Do All Day?: Field Experiences In Literacy Coaching (Katherine Brodeur, Susan Massey, Lisa Ortmann, And Cynthia Bertelsen); (9) The Engaged Learning Model: The Impact Of Digital Literacy And Problem-Based Learning On Fourth Graders' Vocabulary And General Reading Outcomes (James E. Gentry, Chris Sloan, And Robin Pate); (10) Teachers Implementing Coaching Mindsets: A Path To Literacy Leadership (Aimee Morewood, Susan Taylor, Julie Ankrum, Allison Swan Dagen, And Angela Curfman); (11) High Stakes Testing In Teacher Education: Responses And Implications (Maryann Mraz, Bob Rickelman, S. Michael Putman, Paola Pilonieta, And Jean Vintinner); (12) The Lasting Impact Of A University Common Reading Program (Kristen Ferguson, Natalya Brown, And Linda Piper); (13) Honoring All Of The Language Arts: A Constructivist Approach To Preservice Teachers' Classroom Observations (Delane Bender-Slack And Teresa Young); (14) Preservice Teachers' Sense Of Efficacy For Literacy Instruction: Examination Of An Undergraduate Delivery System (Corinne Valadez, Tomas Espinosa, Johnathan Hill, And Maureen Sullivan); (15) Cohort Participation: Impact On Personal Learning Networks (Caryssa K. Retrum, Elizabeth Alderton, Glady Van Harpen, And Stephanie Bernander); (16) Disrupting The University Curriculum: Engaging Preservice Teachers In A Study Abroad "Passport" Activity (Virginia R. Massaro, Joan A. Rhodes, And Sharon Zumbrunn); (17) "If You're Not Reading, You're Not Growing": Exploring The Reading Habits Of Preservice Teachers In A Children's Literature Course (Bethanie Pletcher And Tomas Espinosa); (18) Shaping And Being Shaped: Exploring Preservice Teachers' Literacy Autobiographies (Stacey J. Korson And Connie Beckner Hodge); (19) Supporting Literacy Teaching Through Rehearsal (Nicholas Husbye); (20) Phonics And Phonemic Awareness In A Teacher Preparation Program: An Analysis Of The Achievement And Perceptions Of Pre-Service Teachers (Stacey Bose); (21) The Power Of Family Involvement: Preparing Preservice Teachers To Understand More About The Out Of School Literacy Lives And Cultures Of Children (Kathryn V. Dixon, Martha M. Foote, And Juan J. Araujo With Rhonda Clark, Carol Revelle, And Tami Morton); (22) Supporting The Literacy Development Of At-Risk First Time College Students Through The Exploration Of Language And Culture (Connie Briggs, Patricia A. Watson, And Ivan Dole); And (23) Exploring The Reading Strategy Use Of EFL College Students: Tri-lingual Chinese Students Attending A University In Korea (Kay Hong-Nam And Susan Szabo). [For The Thirty-Ninth Yearbook, See ED594524.]
  • Author:
  • Language: English

“ERIC ED591953: Engaging All Readers Through Explorations Of Literacy, Language, And Culture. The Fortieth Yearbook: A Double Peer-Reviewed Publication Of The Association Of Literacy Educators And Researchers For Their 61st Annual Conference, The Association Of Literacy Educators And Researchers (ALER) Met In St. Petersburg, Florida. This Year's Conference Theme Was "Engaging All Readers Through Explorations Of Literacy, Language, And Culture," Which Was Also Used As The Title For This Year's "Yearbook." This "Yearbook" Contains Articles About Innovative Strategies For Teachers And Teacher Leaders, Research Trends Within Teacher Education Programs, And Innovative And Seminal Strategies For Preservice Teachers. Included Are Double-peer Reviewed Papers, The Presidential Address, And The Keynote Address: (1) Systems Without A Process: Know What To Do And Then Do It Well (David D. Paige); (2) Reclaiming Creative Literacy Practices (Thomas W. Bean); (3) Understanding Reasoning And Academic Language In Economics (Chang Yuan); (4) "There Might Be Words On The Screen, But It's Not The Same": Engaging Tweens In Literacy Through Minecraft Book Groups (Carolyn Stufft); (5) Stranger Than Nonfiction: Identifying And Modeling Text Structures In Fiction Picturebooks (Tracey S. Hodges And Sharon D. Matthews); (6) "Es Lo Que Hacemos"/It's What We Do: Translanguaging To Make Meaning During Read Alouds (Erin Greeter); (7) Research On Reader's Theater (Faida Stokes And Chase Young); (8) What DO They Do All Day?: Field Experiences In Literacy Coaching (Katherine Brodeur, Susan Massey, Lisa Ortmann, And Cynthia Bertelsen); (9) The Engaged Learning Model: The Impact Of Digital Literacy And Problem-Based Learning On Fourth Graders' Vocabulary And General Reading Outcomes (James E. Gentry, Chris Sloan, And Robin Pate); (10) Teachers Implementing Coaching Mindsets: A Path To Literacy Leadership (Aimee Morewood, Susan Taylor, Julie Ankrum, Allison Swan Dagen, And Angela Curfman); (11) High Stakes Testing In Teacher Education: Responses And Implications (Maryann Mraz, Bob Rickelman, S. Michael Putman, Paola Pilonieta, And Jean Vintinner); (12) The Lasting Impact Of A University Common Reading Program (Kristen Ferguson, Natalya Brown, And Linda Piper); (13) Honoring All Of The Language Arts: A Constructivist Approach To Preservice Teachers' Classroom Observations (Delane Bender-Slack And Teresa Young); (14) Preservice Teachers' Sense Of Efficacy For Literacy Instruction: Examination Of An Undergraduate Delivery System (Corinne Valadez, Tomas Espinosa, Johnathan Hill, And Maureen Sullivan); (15) Cohort Participation: Impact On Personal Learning Networks (Caryssa K. Retrum, Elizabeth Alderton, Glady Van Harpen, And Stephanie Bernander); (16) Disrupting The University Curriculum: Engaging Preservice Teachers In A Study Abroad "Passport" Activity (Virginia R. Massaro, Joan A. Rhodes, And Sharon Zumbrunn); (17) "If You're Not Reading, You're Not Growing": Exploring The Reading Habits Of Preservice Teachers In A Children's Literature Course (Bethanie Pletcher And Tomas Espinosa); (18) Shaping And Being Shaped: Exploring Preservice Teachers' Literacy Autobiographies (Stacey J. Korson And Connie Beckner Hodge); (19) Supporting Literacy Teaching Through Rehearsal (Nicholas Husbye); (20) Phonics And Phonemic Awareness In A Teacher Preparation Program: An Analysis Of The Achievement And Perceptions Of Pre-Service Teachers (Stacey Bose); (21) The Power Of Family Involvement: Preparing Preservice Teachers To Understand More About The Out Of School Literacy Lives And Cultures Of Children (Kathryn V. Dixon, Martha M. Foote, And Juan J. Araujo With Rhonda Clark, Carol Revelle, And Tami Morton); (22) Supporting The Literacy Development Of At-Risk First Time College Students Through The Exploration Of Language And Culture (Connie Briggs, Patricia A. Watson, And Ivan Dole); And (23) Exploring The Reading Strategy Use Of EFL College Students: Tri-lingual Chinese Students Attending A University In Korea (Kay Hong-Nam And Susan Szabo). [For The Thirty-Ninth Yearbook, See ED594524.]” Subjects and Themes:

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Find ERIC ED591953: Engaging All Readers Through Explorations Of Literacy, Language, And Culture. The Fortieth Yearbook: A Double Peer-Reviewed Publication Of The Association Of Literacy Educators And Researchers For Their 61st Annual Conference, The Association Of Literacy Educators And Researchers (ALER) Met In St. Petersburg, Florida. This Year's Conference Theme Was "Engaging All Readers Through Explorations Of Literacy, Language, And Culture," Which Was Also Used As The Title For This Year's "Yearbook." This "Yearbook" Contains Articles About Innovative Strategies For Teachers And Teacher Leaders, Research Trends Within Teacher Education Programs, And Innovative And Seminal Strategies For Preservice Teachers. Included Are Double-peer Reviewed Papers, The Presidential Address, And The Keynote Address: (1) Systems Without A Process: Know What To Do And Then Do It Well (David D. Paige); (2) Reclaiming Creative Literacy Practices (Thomas W. Bean); (3) Understanding Reasoning And Academic Language In Economics (Chang Yuan); (4) "There Might Be Words On The Screen, But It's Not The Same": Engaging Tweens In Literacy Through Minecraft Book Groups (Carolyn Stufft); (5) Stranger Than Nonfiction: Identifying And Modeling Text Structures In Fiction Picturebooks (Tracey S. Hodges And Sharon D. Matthews); (6) "Es Lo Que Hacemos"/It's What We Do: Translanguaging To Make Meaning During Read Alouds (Erin Greeter); (7) Research On Reader's Theater (Faida Stokes And Chase Young); (8) What DO They Do All Day?: Field Experiences In Literacy Coaching (Katherine Brodeur, Susan Massey, Lisa Ortmann, And Cynthia Bertelsen); (9) The Engaged Learning Model: The Impact Of Digital Literacy And Problem-Based Learning On Fourth Graders' Vocabulary And General Reading Outcomes (James E. Gentry, Chris Sloan, And Robin Pate); (10) Teachers Implementing Coaching Mindsets: A Path To Literacy Leadership (Aimee Morewood, Susan Taylor, Julie Ankrum, Allison Swan Dagen, And Angela Curfman); (11) High Stakes Testing In Teacher Education: Responses And Implications (Maryann Mraz, Bob Rickelman, S. Michael Putman, Paola Pilonieta, And Jean Vintinner); (12) The Lasting Impact Of A University Common Reading Program (Kristen Ferguson, Natalya Brown, And Linda Piper); (13) Honoring All Of The Language Arts: A Constructivist Approach To Preservice Teachers' Classroom Observations (Delane Bender-Slack And Teresa Young); (14) Preservice Teachers' Sense Of Efficacy For Literacy Instruction: Examination Of An Undergraduate Delivery System (Corinne Valadez, Tomas Espinosa, Johnathan Hill, And Maureen Sullivan); (15) Cohort Participation: Impact On Personal Learning Networks (Caryssa K. Retrum, Elizabeth Alderton, Glady Van Harpen, And Stephanie Bernander); (16) Disrupting The University Curriculum: Engaging Preservice Teachers In A Study Abroad "Passport" Activity (Virginia R. Massaro, Joan A. Rhodes, And Sharon Zumbrunn); (17) "If You're Not Reading, You're Not Growing": Exploring The Reading Habits Of Preservice Teachers In A Children's Literature Course (Bethanie Pletcher And Tomas Espinosa); (18) Shaping And Being Shaped: Exploring Preservice Teachers' Literacy Autobiographies (Stacey J. Korson And Connie Beckner Hodge); (19) Supporting Literacy Teaching Through Rehearsal (Nicholas Husbye); (20) Phonics And Phonemic Awareness In A Teacher Preparation Program: An Analysis Of The Achievement And Perceptions Of Pre-Service Teachers (Stacey Bose); (21) The Power Of Family Involvement: Preparing Preservice Teachers To Understand More About The Out Of School Literacy Lives And Cultures Of Children (Kathryn V. Dixon, Martha M. Foote, And Juan J. Araujo With Rhonda Clark, Carol Revelle, And Tami Morton); (22) Supporting The Literacy Development Of At-Risk First Time College Students Through The Exploration Of Language And Culture (Connie Briggs, Patricia A. Watson, And Ivan Dole); And (23) Exploring The Reading Strategy Use Of EFL College Students: Tri-lingual Chinese Students Attending A University In Korea (Kay Hong-Nam And Susan Szabo). [For The Thirty-Ninth Yearbook, See ED594524.] at online marketplaces:


34Radar System Analysis And Modeling

By

For their 61st annual conference, the Association of Literacy Educators and Researchers (ALER) met in St. Petersburg, Florida. This year's conference theme was "Engaging All Readers through Explorations of Literacy, Language, and Culture," which was also used as the title for this year's "Yearbook." This "Yearbook" contains articles about innovative strategies for teachers and teacher leaders, research trends within teacher education programs, and innovative and seminal strategies for preservice teachers. Included are double-peer reviewed papers, the presidential address, and the keynote address: (1) Systems Without a Process: Know What To Do and Then Do It Well (David D. Paige); (2) Reclaiming Creative Literacy Practices (Thomas W. Bean); (3) Understanding Reasoning and Academic Language in Economics (Chang Yuan); (4) "There Might Be Words on the Screen, but it's Not the Same": Engaging Tweens in Literacy through Minecraft Book Groups (Carolyn Stufft); (5) Stranger than Nonfiction: Identifying and Modeling Text Structures in Fiction Picturebooks (Tracey S. Hodges and Sharon D. Matthews); (6) "Es Lo Que Hacemos"/It's What We Do: Translanguaging to Make Meaning During Read Alouds (Erin Greeter); (7) Research on Reader's Theater (Faida Stokes and Chase Young); (8) What DO they do all day?: Field Experiences in Literacy Coaching (Katherine Brodeur, Susan Massey, Lisa Ortmann, and Cynthia Bertelsen); (9) The Engaged Learning Model: The Impact of Digital Literacy and Problem-Based Learning on Fourth Graders' Vocabulary and General Reading Outcomes (James E. Gentry, Chris Sloan, and Robin Pate); (10) Teachers Implementing Coaching Mindsets: A Path to Literacy Leadership (Aimee Morewood, Susan Taylor, Julie Ankrum, Allison Swan Dagen, and Angela Curfman); (11) High Stakes Testing in Teacher Education: Responses and Implications (Maryann Mraz, Bob Rickelman, S. Michael Putman, Paola Pilonieta, and Jean Vintinner); (12) The Lasting Impact of a University Common Reading Program (Kristen Ferguson, Natalya Brown, and Linda Piper); (13) Honoring All of the Language Arts: A Constructivist Approach to Preservice Teachers' Classroom Observations (Delane Bender-Slack and Teresa Young); (14) Preservice Teachers' Sense of Efficacy for Literacy Instruction: Examination of an Undergraduate Delivery System (Corinne Valadez, Tomas Espinosa, Johnathan Hill, and Maureen Sullivan); (15) Cohort Participation: Impact on Personal Learning Networks (Caryssa K. Retrum, Elizabeth Alderton, Glady Van Harpen, and Stephanie Bernander); (16) Disrupting the University Curriculum: Engaging Preservice Teachers in a Study Abroad "Passport" Activity (Virginia R. Massaro, Joan A. Rhodes, and Sharon Zumbrunn); (17) "If You're Not Reading, You're Not Growing": Exploring the Reading Habits of Preservice Teachers in a Children's Literature Course (Bethanie Pletcher and Tomas Espinosa); (18) Shaping and Being Shaped: Exploring Preservice Teachers' Literacy Autobiographies (Stacey J. Korson and Connie Beckner Hodge); (19) Supporting Literacy Teaching Through Rehearsal (Nicholas Husbye); (20) Phonics and Phonemic Awareness in a Teacher Preparation Program: An Analysis of the Achievement and Perceptions of Pre-Service Teachers (Stacey Bose); (21) The Power of Family Involvement: Preparing Preservice Teachers to Understand More about the Out of School Literacy Lives and Cultures of Children (Kathryn V. Dixon, Martha M. Foote, and Juan J. Araujo with Rhonda Clark, Carol Revelle, and Tami Morton); (22) Supporting the Literacy Development of At-Risk First Time College Students through the Exploration of Language and Culture (Connie Briggs, Patricia A. Watson, and Ivan Dole); and (23) Exploring the Reading Strategy Use of EFL College Students: Tri-lingual Chinese Students Attending a University in Korea (Kay Hong-Nam and Susan Szabo). [For the Thirty-Ninth Yearbook, see ED594524.]

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35NASA Technical Reports Server (NTRS) 20030000769: Space Station Environment Control And Life Support System Pressure Control Pump Assembly Modeling And Analysis

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This paper presents the Modeling and Analysis of the Space Station Environment Control and Life Support System Pressure Control Pump Assembly (PCPA). The contents include: 1) Integrated PCPA/Manifold Analyses; 2) Manifold Performance Analysis; 3) PCPA Motor Heat Leak Study; and 4) Future Plans. This paper is presented in viewgraph form.

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36NASA Technical Reports Server (NTRS) 20150000250: Propulsion System Simulation Using The Toolbox For The Modeling And Analysis Of Thermodynamic System (T-MATS)

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A simulation toolbox has been developed for the creation of both steady-state and dynamic thermodynamic software models. This presentation describes the Toolbox for the Modeling and Analysis of Thermodynamic Systems (T-MATS), which combines generic thermodynamic and controls modeling libraries with a numerical iterative solver to create a framework for the development of thermodynamic system simulations, such as gas turbine engines. The objective of this presentation is to present an overview of T-MATS, the theory used in the creation of the module sets, and a possible propulsion simulation architecture.

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37NASA Technical Reports Server (NTRS) 19930016624: A Spatial Analysis And Modeling System (SAMS) For Environment Management

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This is a proposal to develop a uniform global environmental data gathering and distribution system to support the calibration and validation of remotely sensed data. SAMS is based on an enhanced version of FE MA's Integrated Emergency Management Information Systems and the Department of Defense's Air Land Battlefield Environment Software Systems. This system consists of state-of-the-art graphics and visualization techniques, simulation models, database management and expert systems for conducting environmental and disaster preparedness studies. This software package will be integrated into various Landsat and UNEP-GRID stations which are planned to become direct readout stations during the EOS timeframe. This system would be implemented as a pilot program to support the Tropical Rainfall Measuring Mission (TRMM). This will be a joint NASA-FEMA-University-Industry project.

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38Improvement Of An Automated CAN Packaging System Based On Modeling And Analysis Approach Through Robot Simulation Tools

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The application of robot simulation tools for modelling, analysis and improvement of existing industrial manufacturing cells is presented with reference to the development and implementation of the digital factory concept. A real case study of aerosol can packaging and palletizing cell scenario in the metal can manufacturing industry for containing food and products is used as a reference in this paper. For studying manual aerosol can packaging and palletizing conditions of the worker, a detailed Time and Motion analysis of workers is carried out. On the basis of cycle time analysis results, an alternative to the manual operation, a more sophisticated automated packaging and palletizing system is suggested. A proposed system which uses a robotic manipulator including automated production machine and devices are also developed and tested. The viability of the suggested system is checked through simulation and cycle time analysis. A fuzzy logic software, MATLAB is employed in order to analyse the actual system’s behaviour in terms of productivity, and utilization of the available facilities. The 3D simulation software, DELMIA V6 is additionally employed to perform a detailed design phase of the manufacturing cell. From the simulation results, this gives a rough approximation that the production of one robotized manipulator, and automated packaging and palletizing cell is equal to the production of about 4.3 manual packaging and palletizing cells. These results have shown the need for change to automation in the aerosol can packaging and palletizing system.

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39DTIC ADA615556: Modeling, Simulation, And Analysis Of A Decoy State Enabled Quantum Key Distribution System

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Quantum Key Distribution (QKD) is an emerging technology which uses the principles of quantum mechanics to provide unconditionally secure key distribution. QKD systems are unique in their ability to detect an eavesdropper's presence and are being marketed for applications where high levels of secrecy are required such as banking, government, and military environments. QKD systems are composed of electrical, optical, and electrooptical components. Their design requires expertise across multiple disciplines including computer science, computer engineering, electrical engineering, information theory, optical physics, and quantum physics. This multidisciplinary nature makes QKD an ideal candidate for study using Model Based Systems Engineering (MBSE) Processes, Methods, and Tools (PMTs). The primary research goal is to gain understanding of the operation and performance of the QKD decoy state protocol through the use of MBSE PMTs. The main research contributions include development of a decoy state model, validation of the this protocol in a QKD system model implementation, and confirmation that application of MBSE PMTs are critical to the understanding and analysis of complex systems. This work presents the first known application of MBSE PMTs to analyze a QKD system and provides utility to system developers, designers and analysts who seek to quantify performance and security.

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40DTIC ADA219653: Failure Analysis And Modeling Of A Multicomputer System

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This thesis describes the results of an extensive measurement-based analysis of real error data collected from a 7-machine DEC VaxCluster multicomputer system. In addition to evaluating basic system error and failure characteristics, we develop reward models to analyze the impact of failures and errors on the system. The results show that, although 98% of errors in the shared resources recover, they result in 48% of all system failures. The analysis of rewards shows that the expected reward rate for the Vax Cluster decreases to 0.5 in 100 days for a 3 out of 7 model, which is well over a 100 times that for a 7-out-of-7 model. A comparison of the reward rates for a range of k-out-of-n models indicates that the maximum increase in reward rate (0.25) occurs in going from the 6-out-of-7 model to the 5-out-of-7 model. The analysis also shows that software errors have the lowest reward (0.2 vs. 0.91 for network errors). The large loss in reward rate for software errors is due to the fact that a large proportion (94%) of software errors lead to failure. In comparison, the high reward rate for network errors is due to fast recovery from a majority of these errors (median recovery duration is 0 seconds).

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41DTIC ADA446849: Modeling And Analysis Of A Robust Thermal Control System Based On Forced Convection Thermal Switches

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There is a critical need, not just in the Department of Defense (DOD) but the entire space industry, to reduce the development time and overall cost of satellite missions. To that end, the DOD is actively pursuing the capability to reduce the deployment time of a new system from years to weeks or even days. The goal is to provide the advantages space affords not just to the strategic planner but also to the battlefield commanders. One of the most challenging aspects of this problem is the satellite's thermal control system (TCS). Traditionally the TCS must be vigorously designed, analyzed, tested, and optimized from the ground up for every satellite mission. This reinvention of the wheel is costly and time intensive. The next generation satellite TCS must be modular and scalable in order to cover a wide range of applications, orbits, and mission requirements. To meet these requirements a robust thermal control system utilizing forced convection thermal switches was investigated. The problem was investigated in two separate stages. The first focused on the overall design of the bus. The second stage focused on the overarching bus architecture and the design impacts of employing a thermal switch based TCS design. For the hot case, the fan provided additional cooling to increase the heat transfer rate of the subsystem. During the cold case, the result was a significant reduction in survival heater power.

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42NASA Technical Reports Server (NTRS) 20040129726: Assessment Of Technologies For The Space Shuttle External Tank Thermal Protection System And Recommendations For Technology Improvement. Part 2; Structural Analysis Technologies And Modeling Practices

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A technology review and assessment of modeling and analysis efforts underway in support of a safe return to flight of the thermal protection system (TPS) for the Space Shuttle external tank (ET) are summarized. This review and assessment effort focuses on the structural modeling and analysis practices employed for ET TPS foam design and analysis and on identifying analysis capabilities needed in the short-term and long-term. The current understanding of the relationship between complex flight environments and ET TPS foam failure modes are reviewed as they relate to modeling and analysis. A literature review on modeling and analysis of TPS foam material systems is also presented. Finally, a review of modeling and analysis tools employed in the Space Shuttle Program is presented for the ET TPS acreage and close-out foam regions. This review includes existing simplified engineering analysis tools are well as finite element analysis procedures.

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43ERIC ED032991: System Analysis, Program Development, And Cost-Effectiveness Modeling Of Indian Education For The Bureau Of Indian Affairs. Volume II, Education Systems Analysis & Programs Development.

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The general objective of the analysis of the Bureau of Indian Affairs (BIA) education system is the identification and definition of the principal problems in the system, so that programs to alleviate them may be planned, developed, tested, and implemented. This volume of the analysis presents a systems analysis of Indian education in the BIA schools. Objectives, methodology, and findings are presented relative to education and the interaction of economic factors and the community with education. Following the above presentation alternative plans and programs and presented relative to the findings of the analysis. The films "Problems of American Education" and "Alternatives for American Indian Education" were developed concurrent to and in conjunction with this document and were designed to give visual and auditory support to the findings of the study. Related documents are RC 003 750, RC 003 751, and RC 003 752. (DK)

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44NASA Technical Reports Server (NTRS) 19950010767: Earth Observing System (EOS) Communication (Ecom) Modeling, Analysis, And Testbed (EMAT) Activiy

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This paper describes the Earth Observing System (EOS) Communication (Ecom) Modeling, Analysis, and Testbed (EMAT) activity performed by Code 540 in support of the Ecom project. Ecom is the ground-to-ground data transport system for operational EOS traffic. The National Aeronautic and Space Administration (NASA) Communications (Nascom) Division, Code 540, is responsible for implementing Ecom. Ecom interfaces with various systems to transport EOS forward link commands, return link telemetry, and science payload data. To understand the complexities surrounding the design and implementation of Ecom, it is necessary that sufficient testbedding, modeling, and analysis be conducted prior to the design phase. These activities, when grouped, are referred to as the EMAT activity. This paper describes work accomplished to date in each of the three major EMAT activities: modeling, analysis, and testbedding.

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45NASA Technical Reports Server (NTRS) 20010069508: Modeling And Test Data Analysis Of A Tank Rapid Chill And Fill System For The Advanced Shuttle Upper Stage (ASUS) Concept

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The Advanced Shuttle Upper Stage (ASUS) concept addresses safety concerns associated .with cryogenic stages by launching empty, and filling on ascent. The ASUS employs a rapid chill and fill concept. A spray bar is used to completely chill the tank before fill, allowing the vent valve to be closed during the fill process. The first tests of this concept, using a flight size (not flight weight) tank. were conducted at Marshall Space Flight Center (MSFC) during the summer of 2000. The objectives of the testing were to: 1) demonstrate that a flight size tank could be filled in roughly 5 minutes to accommodate the shuttle ascent window, and 2) demonstrate a no-vent fill of the tank. A total of 12 tests were conducted. Models of the test facility fill and vent systems, as well as the tank, were constructed. The objective of achieving tank fill in 5 minutes was met during the test series. However, liquid began to accumulate in the tank before it was chilled. Since the tank was not chilled until the end of each test, vent valve closure during fill was not possible. Even though the chill and fill process did not occur as expected, reasonable model correlation with the test data was achieved.

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46The Use Of System Dynamics Analysis And Modeling Techniques To Explore Policy Levers In The Fight Against Middle Eastern Terrorist Groups

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The objective of this project is to use analysis and modeling techniques of Systems Dynamics to capture the causal relationships of Middle Eastern groups' terrorist activities against the U.S. based on their ideological drivers, as well as the effect of U.S. policies that create dynamics and affect performance and outcomes. The main focus of this analysis is the terrorist groups' human resources. The hypothesis is that Middle Eastern terrorism against the U.S. is affected by the U.S. level of military presence and/or investment in the Middle Eastern nations. A considerable and lasting reduction in fatalities originated by Middle Eastern groups' terrorist attacks against the U.S. can be achieved through a policy that reduces both the human resources available to terrorist groups and their attack capability (level of sophistication). The study covers the implications of this resource reduction policy, which may include incremental military investment, defection motivators, antiterrorism and the use of counter-terrorism operations. These operations will reduce the sophistication as well as the recruitment rate to levels where cells' functionality will be impaired, and thus unable to carry high lethality attacks.

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47Dynamic System Identification And Modeling Of A Rotary Wing UAV For Stability And Control Analysis

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Thesis advisor(s): Russel W. Duren

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48ERIC ED060970: System Analysis, Program Development, And Cost-Effectiveness Modeling Of Indian Education For The Bureau Of Indian Affairs. Volume I, Summary And Recommendations.

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The objectives of this project to increase the effectiveness and efficiency of American Indian education through the Bureau of Indian Affairs (BIA) were (1) a system analysis of the BIA schools to identify educational goals and objectives and the critical factors contributing to or impeding eeducational effectiveness in achieving the goals; (2) formulation of alternative programs responsive to the educational goals and objectives, taking into account the critical factors previously identified; and (3) development of cost-effectiveness models for estimating the probable impacts and relative efficiencies of alternative programs for rational planning and budgeting. Goals and objectives were identified by a process of interviews and projective exercises with educational change agents in the BIA education system. Actual operations were observed in 30 BIA schools on 6 reservations and in Alaska and Oklahoma. Some 150 programs were formulated to satisfy several degrees of budget constraint. Twelve district models were designed to deal with specific school system planning, school management, and instructional problems. The document contains objectives, methods, and results of the project; a discussion of goals of Indian education; a summary of programs developed to respond to the goals of Indian education and its problems; narrative sketches of the models that were designed; and a discussion of the processes of change and implementation. Related documents are ED 032 991 through ED 032 994. (JH)

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49Mantis: Predicting System Performance Through Program Analysis And Modeling

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We present Mantis, a new framework that automatically predicts program performance with high accuracy. Mantis integrates techniques from programming language and machine learning for performance modeling, and is a radical departure from traditional approaches. Mantis extracts program features, which are information about program execution runs, through program instrumentation. It uses machine learning techniques to select features relevant to performance and creates prediction models as a function of the selected features. Through program analysis, it then generates compact code slices that compute these feature values for prediction. Our evaluation shows that Mantis can achieve more than 93% accuracy with less than 10% training data set, which is a significant improvement over models that are oblivious to program features. The system generates code slices that are cheap to compute feature values.

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50Modeling, Control And Steady State Analysis Of Back To Back VSC HVDC System

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This paper proposes a dynamic model of a VSC (voltage source converter) based Back to Back HVDC system and its control technique. From the system model, the corresponding relationship between the controlling and the controlled variables of the VSC is determined. The vector control technique is used to control the working of converters. The control structure consists of outer control loop and inner control loop. The outer loop controller controls the active and reactive power separately. The inner loop controller which is a fast working controller provides the reference d- axis and q- axis voltages which are required by the PWM for generating the triggering pulse. The validity of the model and the feasibility of the control method have been proved by the simulation results. In this paper the system performance is studied under steady state condition.

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