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This thesis provides the concepts for the construction of an integrated computer communications network, as would be appropriate for the Republic of Korea (ROK) Defense Data Network (DDN). The current ROK military communications system and its problems are discussed, along with the requirements of the ROK Armed Forces. The basic concepts of data communications and the United States DDN are also analyzed. Through synthesis of these concepts, the goals of the required system and a proposed ROKM DDN model are provided. Keywords: Systems engineering, Systems analysis.

One of the primary if not the central motivating rationale for Network-Centric Warfare (NCW) is that NCW provides an enabling mechanism for information sharing and shared understanding and awareness of military situations of interest, that in turn allows the realization of entirely new concepts of C2 that are advertised as providing greatly increased agility, speed of command, and synchronization in C2. In turn, the underlying enabling IT mechanism for NCW is the Service-Oriented Architecture (SOA) concept, within which all functional services, to include Data Fusion Services, will presumably operate. These attractive but as-yet-not-fully-defined concepts represent a challenge to the Data Fusion community in terms of understanding the implications of the evolving NCW, SOA, and new C2 concepts on the design of Data Fusion Services. Key to this understanding in particular is the need for a close dialog with the C2 research community on exactly what the information needs of new C2 concepts will be and how those needs can best be met by appropriately-designed Data Fusion Services. This talk will address each of these issues and argue for the need for both: (1) a multi-community approach to the architecting of effective and efficient SOA's, and (2) for new initiatives in distributed Data Fusion to address the specific technical challenges of NCW-specific Data Fusion Service design and implementation. (It should be noted that this paper is drawn largely from US literature and so presents a US-based viewpoint developed by the author; the paper does not represent any official US governmental views.) This brief paper is intended to sketch the topical areas that will be addressed in the associated Keynote speech.

To accommodate changes in digital data requirements and to capitalize on the evolution of the DCS to digital operation, a Data Transmission Network (DTN) is being planned to achieve a more efficient and effective transmission of data. This report documents the system engineering required for the DTN by establishing the transmission equipment configurations to be employed, defines user and subsystem interfaces, and describes circuit engineering criteria.

Using data assimilation framework, to merge information from model and measurement, an optimal reconstruction of the neutronic activity field can be determined for a nuclear reactor core. In this paper, we focus on solving the inverse problem of determining an optimal repartition of the measuring instruments within the core, to get the best possible results from the data assimilation reconstruction procedure. The position optimisation is realised using Simulated Annealing algorithm, based on the Metropolis-Hastings one. Moreover, in order to address the optimisation computing challenge, algebraic improvements of data assimilation have been developed and are presented here.

This study examines the benefits of implementing the Defense Data Network at a military organization. The effects of computer-mediated communication, both intended and unintended, are examined. Sociotechnical design is discussed as one effective means to implement the DDN in order to maximize its benefits; this theory contends that the social as well as technical aspects of a system must be considered to generate improved performance. A technical analysis of applying this theory to DDN implementation is provided. A social analysis, the result of a questionnaire administered to three independent samples of DDN users, also is included. Conclusions and recommendations for the study are: Keywords: Sociotechnical, Computer communications, Training, Theses, Management engineering, Computer communications. (jes)

This study examines the benefits of implementing the Defense Data Network at a military organization. The effects of computer-mediated communication, both intended and unintended, are examined. Sociotechnical design is discussed as one effective means to implement the DDN in order to maximize its benefits; this theory contends that the social as well as technical aspects of a system must be considered to generate improved performance. A technical analysis of applying this theory to DDN implementation is provided. A social analysis, the result of a questionnaire administered to three independent samples of DDN users, also is included.

This study examines the benefits of implementing the Defense Data Network at a military organization. The effects of computer-mediated communication, both intended and unintended, are examined. Sociotechnical design is discussed as one effective means to implement the DDN in order to maximize its benefits; this theory contends that the social as well as technical aspects of a system must be considered to generate improved performance. A technical analysis of applying this theory to DDN implementation is provided. A social analysis, the result of a questionnaire administered to three independent samples of DDN users, also is included.

The ACTS High Data-Rate Ground stations were built to support the ACTS Gigabit Satellite Network (GSN). The ACTS GSN was designed to provide fiber-compatible SONET service to remote nodes and networks through a wideband satellite system. The ACTS satellite is unique in its extremely wide bandwidth, and electronically controlled spot beam antennas. This paper discusses the requirements, design and performance of the RF section of the ACTS High Data-Rate Ground Stations and constituent hardware. The ACTS transponder systems incorporate highly nonlinear hard limiting. This introduced a major complexity in to the design and subsequent modification of the ground stations. A discussion of the peculiarities of the A CTS spacecraft transponder system and their impact is included.

The ACTS High Data-Rate Ground stations were built to support the ACTS Gigabit Satellite Network (GSN). The ACTS GSN was designed to provide fiber-compatible SONET service to remote nodes and networks through a wideband satellite system. The ACTS satellite is unique in its extremely wide bandwidth, and electronically controlled spot beam antennas. This paper discusses the requirements, design and performance of the RF section of the ACTS High Data-Rate Ground Stations and constituent hardware. The ACTS transponder systems incorporate highly nonlinear hard limiting. This introduced a major complexity in to the design and subsequent modification of the ground stations. A discussion of the peculiarities of the A CTS spacecraft transponder system and their impact is included.

We examine the problem of optimal design in the context of filtering multiple random walks. Specifically, we define the steady state E-optimal design criterion and show that the underlying optimization problem leads to a second order cone program. The developed methodology is applied to tracking network flow volumes using sampled data, where the design variable corresponds to controlling the sampling rate. The optimal design is numerically compared to a myopic and a naive strategy. Finally, we relate our work to the general problem of steady state optimal design for state space models.

Design and implementation of energy-efficient hybrid data aggregation in heterogeneous wireless sensor network

Design and implementation of energy-efficient hybrid data aggregation in heterogeneous wireless sensor network

Available from National Technical Information Service, Springfield, Va

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

This thesis explores transparent internetwork connectivity requirements for SPLICE (Stock Point Logistics Integrated Communications Environment). SPLICE nodes shall be interconnected via the DDN (Defense Data Network) to form a wide area network supporting distributed processing. Implementation problems, short and long-term requirements for user terminal to server host transparent connectivity, electronic mail, and process to process internetworking connectivity are presented. Distributed processing through implementation of a DDS (Directory/Dictionary System) is explored. MILSTRIP requisition referral by Stock Points through distributed processing is presented. Implementation of Tandem Corporation's EXPAND/X.25 protocols versus DDN TCP/IP and higher level DDN protocols are discussed. Packet switching, - the CCITT X.25 and X.75 protocol standards, and an overview of the DDN TCP/IP protocols are offered in the Appendices.

This thesis explores transparent internetwork connectivity requirements for SPLICE (Stock Point Logistics Integrated Communications Environment). SPLICE nodes shall be interconnected via the DDN (Defense Data Network) to form a wide area network supporting distributed processing. Implementation problems, short and long-term requirements for user terminal to server host transparent connectivity, electronic mail, and process to process internetworking connectivity are presented. Distributed processing through implementation of a DDS (Directory/Dictionary System) is explored. MILSTRIP requisition referral by Stock Points through distributed processing is presented. Implementation of Tandem Corporation's EXPAND/X.25 protocols versus DDN TCP/IP and higher level DDN protocols are discussed. Packet switching, - the CCITT X.25 and X.75 protocol standards, and an overview of the DDN TCP/IP protocols are offered in the Appendices.

Data centers (DCs) have emerged as a viable and  efficient infrastructure for storing data and enabling the launch  of diverse network services and applications alongside the  proliferation of online applications and data volumes (e.g., cloud  computing, video streaming). The underlying infrastructure is  frequently burdened with the diverse resource demands  (storage, computation power, bandwidth, latency) by these  applications and services. The study explores various aspects of data center design, architecture, and the challenges faced by  modern data center infrastructures.

The basic design of an experimental distributed data management system is presented. The system is based upon the relational model. (Author)

The basic design of an experimental distributed data management system is presented. The system is based upon the relational model. (Author)

Design of Sports Decision Model Based on Data Mining and Neural Network

Development of the Network Virtual Data Base System (NVDBS) and the Adaptive User Interface (AUI) address several needs of DOD intelligence systems. The NVDBS could provide a bridge between different data base management systems (DMBSs)) on different host computers (nodes) linked through a network, without being required to know how to access each DBMS directly. The network level description of the information and its logical structures would be interactively available to the casual user. The informed user could then 'navigate' through the Network Data Model (NDM). Further, the analyst could discover and link correlated data, for the NVDBS will support 'virtual linkages' between records physically located on different DBMSs of the NVDBS network. For a DBMS to be accessible on the NVDBS network, it must be on a node of the network, and must be linked to the NVDBS through an interface tailored to the idiosyncrasies of the particular DBMS and node. The NVDBS will behave as an ordinary user of each DBMS on the network. The NVDBS also will support the creation of 'virtual linkages' between record instances physically located on different hosts. This report overviews the preliminary design study. (Author)

Analytical tools, methods and techniques for assessing the design and performance of the space shuttle orbiter data processing system (DPS) are provided. The computer data processing network is evaluated in the key areas of queueing behavior synchronization and network reliability. The structure of the data processing network is described as well as the system operation principles and the network configuration. The characteristics of the computer systems are indicated. System reliability measures are defined and studied. System and network invulnerability measures are computed. Communication path and network failure analysis techniques are included.

Access to network traffic records is an integral part of recognizing and addressing network security breaches. Even with the increasing sophistication of network attacks, basic network events such as connections between two IP addresses play an important role in any network defense. Given the duration of current attacks, long-term data archival is critical but typically very little of the data is ever accessed. Previous work has provided tools and identified the need to trace connections. However, traditional databases raise performance concerns as they are optimized for querying rather than ingestion. The study of write-optimized data structures (WODS) is a new and growing field that provides a novel approach to traditional storage structures (e.g., B-trees). WODS trade minor degradations in query performance for significant gains in the ability to quickly insert more data elements, typically on the order of 10 to 100 times more inserts per second. These efficient, out-of-memory data structures can play a critical role in enabling robust, long-term tracking of network events. In this paper, we present TWIAD, the Write-optimized IP Address Database. TWIAD uses a write-optimized B-tree known as a B {\epsilon} tree to track all IP address connections in a network traffic stream. Our initial implementation focuses on utilizing lower cost hardware, demonstrating that basic long-term tracking can be done without advanced equipment. We tested TWIAD on a modest desktop system and showed a sustained ingestion rate of about 20,000 inserts per second.

Supporting programmable states in the data plane of a forwarding element, e.g., a switch or a NIC, has recently attracted the interest of the research community, which is now looking for the right abstraction to enable the programming of stateful network functions in hardware at line rate. We challenge the conservative assumptions of state-of-the-art abstractions in this field, e.g. always assuming minimum size packets arriving back-to-back. Using trace-based simulations we show that by making more realistic assumptions on the traffic characteristics, e.g. larger average packet size, we can relax the design constraints that currently limit the set of functions that can be implemented at line rate, allowing for more complex functions, with no harm for performance.

The basic design of an experimental distributed data management system is presented. The system is based upon the relational model. (Author)

The basic design of an experimental distributed data management system is presented. The system is based upon the relational model. (Author)

The Mobile Data System, which is intended to provide for packet switched data services is currently under development. The system is based on a star network topology consisting of a centralized Data Hub (DH) serving a large number of mobile terminals. Through the Data Hub, end-to-end connections can be established between terrestrial users on public or private data networks and mobile users. The MDS network will be capable of offering a variety of services some of which are based on the standard X.25 network interface protocol, and others optimized for short messages and broadcast messages. A description of these services and the trade-offs in the DH design are presented.

The Mobile Data System, which is intended to provide for packet switched data services is currently under development. The system is based on a star network topology consisting of a centralized Data Hub (DH) serving a large number of mobile terminals. Through the Data Hub, end-to-end connections can be established between terrestrial users on public or private data networks and mobile users. The MDS network will be capable of offering a variety of services some of which are based on the standard X.25 network interface protocol, and others optimized for short messages and broadcast messages. A description of these services and the trade-offs in the DH design are presented.

The Mobile Data System, which is intended to provide for packet switched data services is currently under development. The system is based on a star network topology consisting of a centralized Data Hub (DH) serving a large number of mobile terminals. Through the Data Hub, end-to-end connections can be established between terrestrial users on public or private data networks and mobile users. The MDS network will be capable of offering a variety of services some of which are based on the standard X.25 network interface protocol, and others optimized for short messages and broadcast messages. A description of these services and the trade-offs in the DH design are presented.

The report contains data on antenna configurations for the low data rate users of the Tracking and Data Relay Satellite System (TDRSS). It treats the coverage and mutual visibility considerations between the user satellites and the relay satellites and relates these considerations to requirements of antenna beamwidth and fractional user orbital coverage. A final section includes user/TDRS telecommunication link budgets and forward and return link data rate tradeoffs.

The ACTS High Data-Rate Ground stations were built to support the ACTS Gigabit Satellite Network (GSN). The ACTS GSN was designed to provide fiber-compatible SONET service to remote nodes and networks through a wideband satellite system. The ACTS satellite is unique in its extremely wide bandwidth, and electronically controlled spot beam antennas. This paper discusses the requirements, design and performance of the RF section of the ACTS High Data-Rate Ground Stations and constituent hardware. The ACTS transponder systems incorporate highly nonlinear hard limiting. This introduced a major complexity in to the design and subsequent modification of the ground stations. A discussion of the peculiarities of the A CTS spacecraft transponder system and their impact is included.

The ACTS High Data-Rate Ground stations were built to support the ACTS Gigabit Satellite Network (GSN). The ACTS GSN was designed to provide fiber-compatible SONET service to remote nodes and networks through a wideband satellite system. The ACTS satellite is unique in its extremely wide bandwidth, and electronically controlled spot beam antennas. This paper discusses the requirements, design and performance of the RF section of the ACTS High Data-Rate Ground Stations and constituent hardware. The ACTS transponder systems incorporate highly nonlinear hard limiting. This introduced a major complexity in to the design and subsequent modification of the ground stations. A discussion of the peculiarities of the A CTS spacecraft transponder system and their impact is included.

The ACTS High Data-Rate Ground stations were built to support the ACTS Gigabit Satellite Network (GSN). The ACTS GSN was designed to provide fiber-compatible SONET service to remote nodes and networks through a wideband satellite system. The ACTS satellite is unique in its extremely wide bandwidth, and electronically controlled spot beam antennas. This paper discusses the requirements, design and performance of the RF section of the ACTS High Data-Rate Ground Stations and constituent hardware. The ACTS transponder systems incorporate highly nonlinear hard limiting. This introduced a major complexity in to the design and subsequent modification of the ground stations. A discussion of the peculiarities of the A CTS spacecraft transponder system and their impact is included.

Bell System Technical Journal, 61: 7. September 1982 pp 1779-1797. Stored Program Controlled Network: Data Base Administration System - Architecture and Data Base Design. (Sampson, S.F.; Tietz, D.W.)

This thesis provides the concepts for the construction of an integrated computer communications network, as would be appropriate for the Republic of Korea (ROK) Defense Data Network (DDN). The current ROK military communications system and its problems are discussed, along with the requirements of the ROK Armed Forces. The basic concepts of data communications and the United States DDN are also analyzed. Through synthesis of these concepts, the goals of the required system and a proposed ROKM DDN model are provided.

This thesis provides the concepts for the construction of an integrated computer communications network, as would be appropriate for the Republic of Korea (ROK) Defense Data Network (DDN). The current ROK military communications system and its problems are discussed, along with the requirements of the ROK Armed Forces. The basic concepts of data communications and the United States DDN are also analyzed. Through synthesis of these concepts, the goals of the required system and a proposed ROKM DDN model are provided.

Thesis advisor(s): Lind, Judith H

Thesis advisor(s): Lind, Judith H. ; Roberts, Benjamin J

The majority of the system on chip (SoC) uses the network on chip (NoC) as routing ports for data transfer from node-to-node with minimal power consumption and low latency and high throughput. This paper concentrates on the ability to model the asynchronous NoCs on the asynchronous circuits on field programmable gate arrays (FPGAs). A 3×3 NoC and its universal asynchronous receiver transmitter (UART) protocol is designed and its simulation of the Verilog hardware description language (VHDL) code is done and tested on the Artix-7 FPGA kit, the testing processes in done using the Chipscope tool. In order to meet target requirements in terms of power consumption and latency, the label switching (LS) technique is used as routing. The proposed LS-NoC with level-encoded dual-rail (LEDR) encoding technique provides throughput by registering the packet between the different routers and it helps to improve throughput and speed. The effectiveness of the data transfer is measured and analyzed through a synthesis summary in terms of lookup table’s (LUT’s), slice registers, flip flops’s (FF’s), latency, and packet delivery ratio (PDR) for the traffic pattern generator. The proposed NoC is designed for 8×8 and each port size is 21 bits including ID’s of source and destination routers. The results can be justified by following results: improvement of LUTs is about 12%, flip-flops are 7%, improvement of throughput is 23% and delay is reduced by 26%