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1

Information communication on complex networks  

NASA Astrophysics Data System (ADS)

Since communication networks such as the Internet, which is regarded as a complex network, have recently become a huge scale and a lot of data pass through them, the improvement of packet routing strategies for transport is one of the most significant themes in the study of computer networks. It is especially important to find routing strategies which can bear as many traffic as possible without congestion in complex networks. First, using neural networks, we introduce a strategy for packet routing on complex networks, where path lengths and queue lengths in nodes are taken into account within a framework of statistical physics. Secondly, instead of using shortest paths, we propose efficient paths which avoid hubs, nodes with a great many degrees, on scale-free networks with a weight of each node. We improve the heuristic algorithm proposed by Danila et. al. which optimizes step by step routing properties on congestion by using the information of betweenness, the probability of paths passing through a node in all optimal paths which are defined according to a rule, and mitigates the congestion. We confirm the new heuristic algorithm which balances traffic on networks by achieving minimization of the maximum betweenness in much smaller number of iteration steps. Finally, We model virus spreading and data transfer on peer-to-peer (P2P) networks. Using mean-field approximation, we obtain an analytical formulation and emulate virus spreading on the network and compare the results with those of simulation. Moreover, we investigate the mitigation of information traffic congestion in the P2P networks.

Igarashi, Akito; Kawamoto, Hiroki; Maruyama, Takahiro; Morioka, Atsushi; Naganuma, Yuki

2013-02-01

2

COMMUNICATION NETWORKS AND THE RISE OF AN INFORMATION ELITE  

E-print Network

? This essay develops a model to simulate the behavior of collaborative information networks, and reveals into dynamic information sharing behaviors. KEYWORDS: information networks, information economics, value addedCOMMUNICATION NETWORKS AND THE RISE OF AN INFORMATION ELITE CAN COMMUNICATION HELP THE INFORMATION

3

Information Delivery Through Broadcasting in Satellite Communication Networks  

E-print Network

Information Delivery Through Broadcasting in Satellite Communication Networks Leandros Tassiulas­range multicasting capability of satellites and the asymmetry of satellite communications (high bandwidth downlink. We consider a data broadcasting model that is encountered in most asymmetric satellite communication

Tassiulas, Leandros

4

Information Theory and Communication Networks: An Unconsummated Union  

Microsoft Academic Search

Information theory has not yet had a direct impact on networking, although there are similarities in concepts and methodologies that have consistently attracted the attention of researchers from both fields. In this paper, we review several topics that are related to communication networks and that have an information-theoretic flavor, including multiaccess protocols, timing channels, effective bandwidth of bursty data sources,

Anthony Ephremides; Bruce E. Hajek

1998-01-01

5

David Meets Goliath on the Information Superhighway: Venezuela in the Context of the Electronic Communication Networks.  

ERIC Educational Resources Information Center

Discusses Venezuela's information and communications technology infrastructure and usage patterns; examines future networking plans; and addresses political and economic considerations linked to the information and technology problems in Venezuela and in Latin America in general. (LRW)

Sanchez-Vegas, Saadia

1995-01-01

6

Advanced information processing system: Authentication protocols for network communication  

NASA Technical Reports Server (NTRS)

In safety critical I/O and intercomputer communication networks, reliable message transmission is an important concern. Difficulties of communication and fault identification in networks arise primarily because the sender of a transmission cannot be identified with certainty, an intermediate node can corrupt a message without certainty of detection, and a babbling node cannot be identified and silenced without lengthy diagnosis and reconfiguration . Authentication protocols use digital signature techniques to verify the authenticity of messages with high probability. Such protocols appear to provide an efficient solution to many of these problems. The objective of this program is to develop, demonstrate, and evaluate intercomputer communication architectures which employ authentication. As a context for the evaluation, the authentication protocol-based communication concept was demonstrated under this program by hosting a real-time flight critical guidance, navigation and control algorithm on a distributed, heterogeneous, mixed redundancy system of workstations and embedded fault-tolerant computers.

Harper, Richard E.; Adams, Stuart J.; Babikyan, Carol A.; Butler, Bryan P.; Clark, Anne L.; Lala, Jaynarayan H.

1994-01-01

7

Communicative networks  

Microsoft Academic Search

This essay introduces the concept of communicative networks by analyzing Jacob A. Riis's journalistic attempts to solve social problems in New York's slums at the turn of last century. This renowned social reformer not only believed in the mobilizing potential of various networks for public transportation, but also established networks of his own through his books and newspaper articles, which

Peter Bro

2004-01-01

8

Communication Networking: ICTs and health information in Africa  

Microsoft Academic Search

This paper examines the uses of information and communication technologies (ICTs) in the African health sector. In particular, it shows the benefits that ICTs can bring to African health care systems in the areas of medical information, clinical data exchange, treatment, health education campaigns and international collaboration between African medical experts and their colleagues abroad. Despite the potential benefits and

Tokunbo Ojo

2006-01-01

9

Health care communication networks: disseminating employee information for hospital security.  

PubMed

Health care in the United States is a system that, organizationally speaking, is fragmented. Each hospital facility is independently operated and is responsible for the hiring of its own employees. Corrupt individuals can take advantage of this fragmentation and move from hospital to hospital, gaining employment while hiding previous employment history. However, the need to exchange pertinent information regarding employees will become necessary as hospitals seek to fill positions throughout their organizations. One way to promote this information exchange is to develop trusted information sharing networks among hospital units. This study examined the problems surrounding organizational information sharing and the cultural factors necessary to enhance the exchange of employee information. Surveys were disseminated to 2,603 hospital chief executive officers and chief information officers throughout the nation. A sample of 154 respondents provided data into their current hiring practices and on their willingness to engage in the sharing of employee information. Findings indicated that, although fear of defamation and privacy violations do hinder the exchange of information between hospitals during the hiring process, by increasing external trust, linking the sharing process with the organizational goals of the hospital, and developing a "sharing culture" among hospitals, the exchange of employee information could be enhanced. PMID:19910705

Sumner, Jennifer; Liberman, Aaron; Rotarius, Timothy; Wan, Thomas T H; Eaglin, Ronald

2009-01-01

10

Communications Network  

NASA Technical Reports Server (NTRS)

The Multi-Compatible Network Interface Unit (MCNIU) is intended to connect the space station's communications and tracking, guidance and navigation, life support, electric power, payload data, hand controls, display consoles and other systems, and also communicate with diverse processors. Honeywell is now marketing MCNIU commercially. It has applicability in certain military operations or civil control centers. It has nongovernment utility among large companies, universities and research organizations that transfer large amounts of data among workstations and computers. *This product is no longer commercially available.

1990-01-01

11

A new generalized mechanism of secure internetworked information service creation for future personal communications networks. VI  

Microsoft Academic Search

In the next millennium, to globally provide versatile resource-rich multimedia-based internetworked broadband personal communications services (PCS) with and for everyone, at any time, on any place, and in any format, is the expected ultimate goal of telecommunications networks. The main purpose of this paper is to initially discuss a new generalized mechanism of secure internetworked information service creation using the

Geng-Sheng Kuo

1998-01-01

12

Regional-technical information network system by PC-based communication 'Kougi Net Niigata'  

NASA Astrophysics Data System (ADS)

'Regional-technical information' database was constructed by Industrial research institute of Niigata prefecture. This is available for industries in our prefecture with our PC-based communication network system. And also, it provides communication measures called BBS and electronic mail service with which they can communicate each other. This system is considered to give three effects. First of all, they can get technical information required in regional industries that is not provided by commercial database at their office or factory speedy and correctly. Secondly, they can easily survey technical background of local industries they want to take into partnership in their extension of work. Thirdly, since it provides a place where they can exchange information each other, it promotes their development of new commercial products and partnership.

Tanaka, Koichi; Kitagawa, Yoichi; Hoshino, Kimiaki

13

Communication Networks: The Hidden Organizational Chart  

ERIC Educational Resources Information Center

Communication networks are simply regular patterns of communication between people in an organization. Such networks are essential since they provide the basic structure or informal organizational chart through which information is exchanged throughout the organization. (Author)

Allen, T. Harrell

1976-01-01

14

Sensor Networks Communication strategies  

E-print Network

Outline Sensor Networks Communication strategies Follow on Distributed estimation in sensor@dsi.unifi.it February 1, 2007 A. Benavoli Fully Decentralized Networks #12;Outline Sensor Networks Communication strategies Follow on Outline 1 Sensor Networks An introduction to Sensor Networks Network architectures

Chisci, Luigi

15

Informing the network: Improving communication with interface communities during wildland fire  

USGS Publications Warehouse

An interagency research team studied fire communications that took place during different stages of two wildfires in southern California: one small fire of short duration and one large fire of long duration. This "quick- response" research showed that pre-fire communication planning was particularly effective for smaller fire events and parts of that planning proved invaluable for the large fire event as well. Information seeking by the affected public relied on locally convenient sources during the small fire. During the large fire, widespread evacuations disrupted many of the local informal communication networks. Residents' needs were for "real-time, " place-specific information: precise location, severity, size, and direction of spread of the fires. Fire management agencies must contribute real-time, place-specific fire information when it is most needed by the affected public, as they try to make sense out of the chaos of a wildland fire. Disseminating fire information as broadly as possible through multiple pathways will maximize the probability of the public finding the information they need. ?? Society for Human Ecology.

Taylor, J.G.; Gillette, S.C.; Hodgson, R.W.; Downing, J.L.; Burns, M.R.; Chavez, D.J.; Hogan, J.T.

2007-01-01

16

Experiences with using information and communication technology to build a multi-municipal support network for informal carers.  

PubMed

This multi-municipal intervention study explored whether informal carers of frail older people and disabled children living at home made use of information and communication technology (ICT) to gain knowledge about caring and to form informal support networks, thereby improving their health. Seventy-nine informal carers accessed web-based information about caring and an e-based discussion forum via their personal computers. They were able to maintain contact with each other using a web camera and via normal group meetings. After the first 12 months, 17 informal carers participated in focus group interviews and completed a short questionnaire. Four staff members were also interviewed. Participant carers who had prior experiences with a similar ICT-based support network reported greater satisfaction and more extensive use of the network than did participants with no such prior experience. It seems that infrequent usage of the service may be explained by too few other carers to identify with and inappropriate recruitment procedures. Nevertheless, carers of disabled children reported that the intervention had resulted in improved services across the participant municipalities. To achieve optimal effects of an ICT-based support network due attention must be given to recruitment processes and social environment building for which care practitioners require training and support. PMID:23245624

Torp, Steffen; Bing-Jonsson, Pia C; Hanson, Elizabeth

2013-09-01

17

A universal quantum information processor for scalable quantum communication and networks  

PubMed Central

Entanglement provides an essential resource for quantum computation, quantum communication, and quantum networks. How to conveniently and efficiently realize the generation, distribution, storage, retrieval, and control of multipartite entanglement is the basic requirement for realistic quantum information processing. Here, we present a theoretical proposal to efficiently and conveniently achieve a universal quantum information processor (QIP) via atomic coherence in an atomic ensemble. The atomic coherence, produced through electromagnetically induced transparency (EIT) in the ?-type configuration, acts as the QIP and has full functions of quantum beam splitter, quantum frequency converter, quantum entangler, and quantum repeater. By employing EIT-based nondegenerate four-wave mixing processes, the generation, exchange, distribution, and manipulation of light-light, atom-light, and atom-atom multipartite entanglement can be efficiently and flexibly achieved in a deterministic way with only coherent light fields. This method greatly facilitates the operations in quantum information processing, and holds promising applications in realistic scalable quantum communication and quantum networks. PMID:25316514

Yang, Xihua; Xue, Bolin; Zhang, Junxiang; Zhu, Shiyao

2014-01-01

18

Information in motion: road vehicles as wireless relay stations for an ad hoc communications network  

Microsoft Academic Search

There is growing interest among automobile engineers and wireless communications researchers in the concept of a Vehicular Ad-hoc NETwork (VANET). Each motor vehicle on the road today provides a natural platform for mobile communications. When equipped with suitable on-board device, the population of vehicles in a busy area becomes a wireless network capable of relaying signals across considerable distances, without

Penina Orenstein; Chris Wright

2008-01-01

19

Synchronization in digital communications networks  

Microsoft Academic Search

The general aspects of timing and synchronization in digital communications networks are reviewed. The properties of the links and nodes carrying and switching time-multiplexed digital signals determine the throughput and performance of a network. The continuity and integrity conditions for the digital information flow, where timing faults cause errors and loss of information, determine the requirements on accurate clock signal

PETER KARTASCHOFF

1991-01-01

20

Aboriginal Information & Communication Technologies  

E-print Network

preparation, communication skills, business understanding, ability to work within various projects, and solidAboriginal Information & Communication Technologies Diploma Program 2010/2011 Division of Continuing Education #12;Division of Continuing Education Aboriginal Information & Communication Technologies

Martin, Jeff

21

Information and Communications Technologies Tutorials  

NSDL National Science Digital Library

The Information and Communications Technologies Center (ICT) presents this collection of links to a number of online tutorials. The tutorials fall under the categories of electronics, fiber optics, general computing and programming, general telecommunications, java, math, matlab, networking and physics.

2012-12-17

22

Video Communication Networks Dan Schonfeld  

E-print Network

Video Communication Networks Dan Schonfeld Multimedia Communications Laboratory Department Chicago, IL 60607-7053 ds@ece.uic.edu Abstract In this presentation, a broad overview of video communication networks is provided. Numerous video communication applications are currently being developed

Schonfeld, Dan

23

A network information theory for wireless communication: scaling laws and optimal operation  

Microsoft Academic Search

How much information can be carried over a wireless network with a multiplicity of nodes, and how should the nodes cooperate to transfer information? To study these questions, we formulate a model of wireless networks that particularly takes into account the distances between nodes, and the resulting attenuation of radio signals, and study a performance measure that weights information by

Liang-liang Xie; Panganamala R. Kumar

2004-01-01

24

Digital information and communication networks and scientific research substance: An investigation of meteorology  

NASA Astrophysics Data System (ADS)

This study investigated research meteorologists' current usage and evaluation of information and communication technologies (ICT) in performing research tasks and the current relationship between meteorologists' ICT use and content characteristics of their research outputs. It surveyed research meteorologists working in three NOAA funded research institutes based at universities. Follow-up interviews with two selective samples of the survey participants were conducted to provide additional evidence to survey results and make suggestions for future measurement development work. Multiple regression analysis was performed to test the hypothesized relationships between meteorologists' ICT use and two substantive characteristics of their research---data integration and intra-/interdisciplinarity. Descriptive statistics were calculated to discern inferences of the scientists' current state of use and their degree of satisfaction with ICT tools. Follow-up interviews were transcribed and analyzed qualitatively with open coding and axial coding. The study findings contradicted the two assumptions of ICT effects on meteorological research by showing that the greater frequency of networked ICT use is not significantly associated with either greater data integration in research analysis, or greater intra- or interdisciplinary research. The major ICT barrier is the lack of a data and information infrastructure and support system for integrated, standardized, specialized, and easily accessible data and information from distributed servers. Suggestions were provided on the improvements of technical, social, political, and educational settings to promote large-scale date integration and intra-/interdisciplinary research. By moving further from theoretical assumptions to practical examinations, the research findings provide empirical evidence of Bowker's theories on the social shaping and social impact of infrastructure in sciences and affirmed some of Bowker's arguments regarding both social-political aspect and technical aspect of e-science practice. The results also provide implications for Computer-Mediated-Communication theories. The knowledge helps information system developers identify several important issues in current systems planning and development. The study also helps librarians, information scientists, and meteorologists both recognize the importance of and develop their collaboration in data, information, and knowledge management. Finally, the study could aid research institutes and government funding agencies to develop appropriate strategies to optimize the effective use of ICT resources and augment its positive impact on sciences.

Shen, Yi

25

Overview of the Space Station communications networks  

NASA Technical Reports Server (NTRS)

Within the Space Station Freedom program, the communications and data-processing capabilities that will be used to handle the operational and scientific information needs will be provided by a Space Station information and communications system. This system will be composed of a variety of elements, networks, and subnetworks. The networks and how they are interconnected are described. The discussion covers communications system elements and services, elements of the onboard systems, wide-area transport network elements, and command and control elements.

Smith, Joseph F.; Willett, Daniel; Paul, Sunil

1990-01-01

26

Covert Communication Networks  

E-print Network

of resilient covert communications networks that: (1) minimize the impact on the network in the event of a subverted node; and (2) maximize the connectivity of the survivor network with the removal of the subverted node and its closed neighborhood. We analyze...

Nix, Timothy Glen

2013-08-02

27

Architecting space communication networks  

E-print Network

Reliable communication and navigation services are critical to robotic and human space missions. NASA currently provides them through three independent and uncoordinated network that consist of both Earth-based and space-based ...

Sanchez Net, Marc

2014-01-01

28

Integrated text-communication services digital networks  

Microsoft Academic Search

Circuit and packet switched facilities as well as distributed information processing units handling new text communication services are part of future integrated services digital networks. The functional integration of text communicaton procedures with the digital network is discussed. Unified handling of batch and interactive text communications is proposed. The use of standardized protocols at both transport and user service levels

R. Montemurro; F. Villani

1980-01-01

29

Social network analysis and dual rover communications  

NASA Astrophysics Data System (ADS)

Social network analysis (SNA) refers to the collection of techniques, tools, and methods used in sociometry aiming at the analysis of social networks to investigate decision making, group communication, and the distribution of information. Human factors engineers at the National Aeronautics and Space Administration (NASA) conducted a social network analysis on communication data collected during a 14-day field study operating a dual rover exploration mission to better understand the relationships between certain network groups such as ground control, flight teams, and planetary science. The analysis identified two communication network structures for the continuous communication and Twice-a-Day Communication scenarios as a split network and negotiated network respectfully. The major nodes or groups for the networks' architecture, transmittal status, and information were identified using graphical network mapping, quantitative analysis of subjective impressions, and quantified statistical analysis using Sociometric Statue and Centrality. Post-questionnaire analysis along with interviews revealed advantages and disadvantages of each network structure with team members identifying the need for a more stable continuous communication network, improved robustness of voice loops, and better systems training/capabilities for scientific imagery data and operational data during Twice-a-Day Communications.

Litaker, Harry L.; Howard, Robert L.

2013-10-01

30

Chapter 5. Communications and Networking Communication and Network  

E-print Network

and Networking 5-2 RLE Progress Report 152 1. Future Optical Network Architecture Sponsors DARPA ­ FONA: HR0011 to the realization of Network-Centric Warfare in the defense world. Sustained exponential growth in communications cost-effective communications in the future. Cost optimized optical network architecture

31

Informal communication in organizations  

Microsoft Academic Search

Abstract: coordination. This paper uses a variety of data from R & D organizations to describeinformal communication and its functions in organizations. It argues that informalcommunication, generally mediated by physical proximity, is crucial for coordination tooccur. Informal communication is frequent in R&D organizations, it aids organizationalmembers in learning about each other and their work, it supports both production workand the

Il Kraut; Tl Fish; B. Root; B. Chalfonte

1992-01-01

32

Role of Directional Wireless Communication in Vehicular Networks  

E-print Network

Role of Directional Wireless Communication in Vehicular Networks Ashish Agarwal and Thomas D of an incident. Wireless radio communication has emerged as a key enabler for exchanging safety information safety communication. However, there are significant constraints to utilizing wireless radio

33

Quantum network communication -- the butterfly and beyond  

E-print Network

We study the k-pair communication problem for quantum information in networks of quantum channels. We consider the asymptotic rates of high fidelity quantum communication between specific sender-receiver pairs. Four scenarios of classical communication assistance (none, forward, backward, and two-way) are considered. (i) We obtain outer and inner bounds of the achievable rate regions in the most general directed networks. (ii) For two particular networks (including the butterfly network) routing is proved optimal, and the free assisting classical communication can at best be used to modify the directions of quantum channels in the network. Consequently, the achievable rate regions are given by counting edge avoiding paths, and precise achievable rate regions in all four assisting scenarios can be obtained. (iii) Optimality of routing can also be proved in classes of networks. The first class consists of directed unassisted networks in which (1) the receivers are information sinks, (2) the maximum distance from senders to receivers is small, and (3) a certain type of 4-cycles are absent, but without further constraints (such as on the number of communicating and intermediate parties). The second class consists of arbitrary backward-assisted networks with 2 sender-receiver pairs. (iv) Beyond the k-pair communication problem, observations are made on quantum multicasting and a static version of network communication related to the entanglement of assistance.

Debbie Leung; Jonathan Oppenheim; Andreas Winter

2009-12-03

34

Communicability betweenness in complex networks  

NASA Astrophysics Data System (ADS)

Betweenness measures provide quantitative tools to pick out fine details from the massive amount of interaction data that is available from large complex networks. They allow us to study the extent to which a node takes part when information is passed around the network. Nodes with high betweenness may be regarded as key players that have a highly active role. At one extreme, betweenness has been defined by considering information passing only through the shortest paths between pairs of nodes. At the other extreme, an alternative type of betweenness has been defined by considering all possible walks of any length. In this work, we propose a betweenness measure that lies between these two opposing viewpoints. We allow information to pass through all possible routes, but introduce a scaling so that longer walks carry less importance. This new definition shares a similar philosophy to that of communicability for pairs of nodes in a network, which was introduced by Estrada and Hatano [E. Estrada, N. Hatano, Phys. Rev. E 77 (2008) 036111]. Having defined this new communicability betweenness measure, we show that it can be characterized neatly in terms of the exponential of the adjacency matrix. We also show that this measure is closely related to a Frchet derivative of the matrix exponential. This allows us to conclude that it also describes network sensitivity when the edges of a given node are subject to infinitesimally small perturbations. Using illustrative synthetic and real life networks, we show that the new betweenness measure behaves differently to existing versions, and in particular we show that it recovers meaningful biological information from a protein-protein interaction network.

Estrada, Ernesto; Higham, Desmond J.; Hatano, Naomichi

2009-03-01

35

NASA technology transfer network communications and information system: TUNS user survey  

NASA Technical Reports Server (NTRS)

Applied Expertise surveyed the users of the deployed Technology Utilization Network System (TUNS) and surveyed prospective new users in order to gather background information for developing the Concept Document of the system that will upgrade and replace TUNS. Survey participants broadly agree that automated mechanisms for acquiring, managing, and disseminating new technology and spinoff benefits information can and should play an important role in meeting NASA technology utilization goals. However, TUNS does not meet this need for most users. The survey describes a number of systematic improvements that will make it easier to use the technology transfer mechanism, and thus expedite the collection and dissemination of technology information. The survey identified 26 suggestions for enhancing the technology transfer system and related processes.

1992-01-01

36

JAMMING COMMUNICATION NETWORKS UNDER COMPLETE ...  

E-print Network

This paper describes a problem of interdicting/jamming wireless communi- ... Jamming communication networks is an important problem but has ...... On connectivity in ad hoc networks under jamming using directional antennas and mobility,.

2007-02-08

37

Ultrawideband direct chaotic wireless communication systems and sensor networks  

Microsoft Academic Search

The ultrawideband communication facilities where chaotic radio pulses are used as an information carrier are considered. As perspective applications of such systems the wireless sensor networks are discussed.

A. S. Dmitriev; E. V. Efremova; A. V. Kletsov; L. V. Kuzmin; N. V. Rumyantsev

2010-01-01

38

Exploring the Use of information and communication technologies and social networks among university nursing faculty staff. An opinion survey.  

PubMed

Objective. This work sought to analyze the use of Information and Communication Technologies (ICTs) and social networks among the university nursing faculty staff in Spain. Methodology. This was a descriptive, cross-sectional study using a questionnaire on ICT skills designed to comply with the research objective, which was evaluated by experts and which was subjected to exploratory analysis of principal components; the reliability of this instrument measured with Cronbach's alpha was 0.85. The information technology tool used to publish the questionnaire on line was Limesurvey. The sample comprised 165 professors from 25 Nursing Faculties and Schools from universities in Spain. Results. Seventy one percent of the total surveyed used internet services to look for information, 63% used the internet as a means for formation and learning, and 72% used it as a communication platform (e-mail and virtual platforms like Sakai and Moodle). Although 51% of the teaching staff surveyed had more than 120 students registered in their courses, hypothesis testing revealed that the number of students in class is not a determining factor for the teaching staff to have greater interest to update its knowledge in ICTs. Younger professors use new technologies more profusely and the most-valued advantage of using ICTs was quick access to information. Professors perceive that after the Bologna Declaration, which requires modifying their teaching-learning processes through the new teaching methodologies, a drop has been produced in their performance and that of their peers in their area of knowledge. Conclusion. The nursing teaching staff is making strong efforts to confront the new challenges posed by ICTs to train the professionals of the 21st century. It is fundamental to pay special attention to improving the university teaching staff's skills in managing ICTs, promoting the implementation of the knowledge acquired. PMID:25504410

Fernndez-Alemn, Jos Luis; Snchez Garca, Ana Beln; Lpez Montesinos, Mara Jos; Marqus-Snchez, Pilar; Bayn Darkistade, Enrique; Prez Rivera, Francisco Javier

2014-12-01

39

Switch for serial or parallel communication networks  

DOEpatents

A communication switch apparatus and a method for use in a geographically extensive serial, parallel or hybrid communication network linking a multi-processor or parallel processing system has a very low software processing overhead in order to accommodate random burst of high density data. Associated with each processor is a communication switch. A data source and a data destination, a sensor suite or robot for example, may also be associated with a switch. The configuration of the switches in the network are coordinated through a master processor node and depends on the operational phase of the multi-processor network: data acquisition, data processing, and data exchange. The master processor node passes information on the state to be assumed by each switch to the processor node associated with the switch. The processor node then operates a series of multi-state switches internal to each communication switch. The communication switch does not parse and interpret communication protocol and message routing information. During a data acquisition phase, the communication switch couples sensors producing data to the processor node associated with the switch, to a downlink destination on the communications network, or to both. It also may couple an uplink data source to its processor node. During the data exchange phase, the switch couples its processor node or an uplink data source to a downlink destination (which may include a processor node or a robot), or couples an uplink source to its processor node and its processor node to a downlink destination.

Crosette, Dario B. (DeSoto, TX)

1994-01-01

40

Switch for serial or parallel communication networks  

DOEpatents

A communication switch apparatus and a method for use in a geographically extensive serial, parallel or hybrid communication network linking a multi-processor or parallel processing system has a very low software processing overhead in order to accommodate random burst of high density data. Associated with each processor is a communication switch. A data source and a data destination, a sensor suite or robot for example, may also be associated with a switch. The configuration of the switches in the network are coordinated through a master processor node and depends on the operational phase of the multi-processor network: data acquisition, data processing, and data exchange. The master processor node passes information on the state to be assumed by each switch to the processor node associated with the switch. The processor node then operates a series of multi-state switches internal to each communication switch. The communication switch does not parse and interpret communication protocol and message routing information. During a data acquisition phase, the communication switch couples sensors producing data to the processor node associated with the switch, to a downlink destination on the communications network, or to both. It also may couple an uplink data source to its processor node. During the data exchange phase, the switch couples its processor node or an uplink data source to a downlink destination (which may include a processor node or a robot), or couples an uplink source to its processor node and its processor node to a downlink destination. 9 figs.

Crosette, D.B.

1994-07-19

41

A Survey on Mix Networks and Their Secure Applications These networks are designed to use multiple-stage cryptography and permutation to protect communicated information such as medical records, personal opinions and electronic voting results  

Microsoft Academic Search

Anonymity is a subdiscipline of information hiding, required in a number of applications, such as in electronic voting. For network communications, anonymity can be provided by a mix network (mixnet). A mixnet is a multistage system that uses cryptography and permutations to provide anonymity. The basic idea of a mixnet has evolved into a number of different classes. In addition

Krishna Sampigethaya; Radha Poovendran

42

Information and communication technology  

NASA Technical Reports Server (NTRS)

NASA and the National Science Foundation (NSF) commissioned a panel of U.S. experts to study the international status of satellite communications systems and technology. The study covers emerging systems concepts, applications, services, and the attendant technologies. The panel members traveled to Europe, Japan, and Russia to gather information firsthand. They visited 17 sites in Europe, 20 in Japan, and 4 in Russia. These included major manufacturers, government organizations, service providers, and associated research and development facilities. The panel's report was reviewed by the sites visited, by the panel, and by representatives of U.S. industry. The report details the information collected and compares it to U.S. activities.

Edelson, Burton I.; Pelton, Joseph N.; Bostian, Charles W.; Brandon, William T.; Chan, Vincent W. S.; Hager, E. Paul; Helm, Neil R.; Jennings, Raymond D.; Kwan, Robert K.; Mahle, Christoph E.

1994-01-01

43

Quantum communication and information processing  

NASA Astrophysics Data System (ADS)

Quantum computers enable dramatically more efficient algorithms for solving certain classes of computational problems, but, in doing so, they create new problems. In particular, Shor's Algorithm allows for efficient cryptanalysis of many public-key cryptosystems. As public key cryptography is a critical component of present-day electronic commerce, it is crucial that a working, secure replacement be found. Quantum key distribution (QKD), first developed by C.H. Bennett and G. Brassard, offers a partial solution, but many challenges remain, both in terms of hardware limitations and in designing cryptographic protocols for a viable large-scale quantum communication infrastructure. In Part I, I investigate optical lattice-based approaches to quantum information processing. I look at details of a proposal for an optical lattice-based quantum computer, which could potentially be used for both quantum communications and for more sophisticated quantum information processing. In Part III, I propose a method for converting and storing photonic quantum bits in the internal state of periodically-spaced neutral atoms by generating and manipulating a photonic band gap and associated defect states. In Part II, I present a cryptographic protocol which allows for the extension of present-day QKD networks over much longer distances without the development of new hardware. I also present a second, related protocol which effectively solves the authentication problem faced by a large QKD network, thus making QKD a viable, information-theoretic secure replacement for public key cryptosystems.

Beals, Travis Roland

44

Cooperation in wireless communication networks  

Microsoft Academic Search

The concept of cooperation in wireless communication networks has drawn significant attention recently from both academia and industry as it can be effective in addressing the performance limitations of wireless networks due to user mobility and the scarcity of network resources. In this article, we aim to shed some light on potential benefits of such an approach and discuss its

Weihua Zhuang; Muhammad Ismail

2012-01-01

45

Integrated design of office communication and building automation networks  

Microsoft Academic Search

Building automation communication systems become today more and more integrated in office communication networks using Ethernet. The paper considers integrated design of both networks, which will allow to use the cable and server infrastructure more effectively. Types of information that should be exchanged between design tools are considered. An approach to contributive using and exchange of design information with the

Andriy Luntovskyy; Dietbert Gtter; Volodymyr Vasyutynskyy; A. Karavan; K. Kabitzsch

2006-01-01

46

Secure communication mechanisms for GSM networks  

Microsoft Academic Search

With the advance of wireless communications technology, mobile communications has become more convenient than ever. However, because of the openness of wireless communications, the protection of the privacy between communicating parties is becoming a very important issue. We focus on the security of the Global System for Mobile communication (GSM) networks. A secure communication architecture for the GSM network is

Chi-Chun Lo; Yu-Jen Chen

1999-01-01

47

An ad hoc networking scheme in hybrid networks for emergency communications  

Microsoft Academic Search

This paper describes an ad hoc networking scheme and routing protocol for emergency communications. The objec- tive of the network is to collect damage assessment information quickly and stably in a disaster. The network is con- figured with a hybrid wireless network, combining ad hoc networks and a cellular network to maintain connectivity between a base station (BS) and nodes

Takahiro Fujiwara; Takashi Watanabe

2005-01-01

48

Communication Dynamics in Finite Capacity Social Networks  

NASA Astrophysics Data System (ADS)

In communication networks, structure and dynamics are tightly coupled. The structure controls the flow of information and is itself shaped by the dynamical process of information exchanged between nodes. In order to reconcile structure and dynamics, a generic model, based on the local interaction between nodes, is considered for the communication in large social networks. In agreement with data from a large human organization, we show that the flow is non-Markovian and controlled by the temporal limitations of individuals. We confirm the versatility of our model by predicting simultaneously the degree-dependent node activity, the balance between information input and output of nodes, and the degree distribution. Finally, we quantify the limitations to network analysis when it is based on data sampled over a finite period of time.

Haerter, Jan O.; Jamtveit, Bjrn; Mathiesen, Joachim

2012-10-01

49

Communication dynamics in finite capacity social networks.  

PubMed

In communication networks, structure and dynamics are tightly coupled. The structure controls the flow of information and is itself shaped by the dynamical process of information exchanged between nodes. In order to reconcile structure and dynamics, a generic model, based on the local interaction between nodes, is considered for the communication in large social networks. In agreement with data from a large human organization, we show that the flow is non-Markovian and controlled by the temporal limitations of individuals. We confirm the versatility of our model by predicting simultaneously the degree-dependent node activity, the balance between information input and output of nodes, and the degree distribution. Finally, we quantify the limitations to network analysis when it is based on data sampled over a finite period of time. PMID:23215144

Haerter, Jan O; Jamtveit, Bjrn; Mathiesen, Joachim

2012-10-19

50

Radiological Workload Information As A Prerequisite For The Configuration Of A Medical Image Archive And Communication Network  

NASA Astrophysics Data System (ADS)

Within the Dutch BAZIS cooperation of 25 major hospitals the IMAGIS (Image Information System) project was started in 1984 to realize a working PACS (Picture Archiving and Communication System) prototype in the next few years. Such a prototype should be clinically evaluated primarily at the Utrecht University Hospital. Simulation has been chosen as a major tool for the set-up and study of a future medical PACS in Dutch hospitals. A pilot study conducted by us thusfar has indicated the usefulness of simulation for our purposes, and clearly indicated the need for information on the present use of images within both the radiological department and the hospital as a whole. We use two ways to collect these data. The first way is through a rough (written) inquiry to all participating hospitals. This will immediately be followed by a more detailed questionnaire to the most involved participants of the BAZIS organization. The second way of collecting crucial data is through a thorough observation of the image handling processes at the Radiology Departments of the Leiden and Utrecht University Hospitals. As may be expected, there will be quite some differences between university (teaching) hospitals and general hospitals, which we will take into account for the Dutch situation. The simulation model that is being extended now will be based upon our inquiry and observation results. The model will include as much components as feasible. Among these will be control layers, interfaces to the existing HIS, a multi-level archive, various numbers and types of imaging workstations, connected by different networks for images, graphics and text, each with specific requirements concerning media, speed and topology. Our final aim is twofold: the study of imaging procedures in existing hospitals and hospitals under construction, and the simulation and the realization of a feasible complete IMAGIS, evolving from a number of successive prototyping iteration cycles.

Bijl, K.; Didden, H.; de Valk, J. P... J...; Bakker, A. R.

1986-06-01

51

[Sensitization: information, education and communication].  

PubMed

IEC programs increase the knowledge and motivation of decision makers with power over determinants of population growth and socioeconomic development. Information may improve the awareness of public and private officials of population questions and of the form in which they are treated. Information activities involve demographic growth and spatial distribution of the population, the demographic and health benefits of family planning, and the danger of sexually transmitted diseases and AIDS. The mass media are the main source of information, but in developing countries various forms of folk media enjoyed by the public may also be used. Technical journals and other information networks are available for the professional audience. Population communication promotes acceptance and use of family planning. Radio and television series that incorporate family planning themes, popular music that mentions population problems, and broadcasts of telephone question and answer programs have been influential in some countries. Such informational programs may be very important in regions with low levels of literacy. Programs targeted to adolescents may help resolve problems of early pregnancy. More than 80 countries include population education in their school curriculum. The objectives vary, but they generally include making students aware of population problems and of their own responsibilities. Population questions are also included in many professional training programs. PMID:12289051

1993-01-01

52

Evaluation Number Two, Texas State Library Communication Network, 1969.  

ERIC Educational Resources Information Center

A companion to ED 029 678 which provided a preliminary evaluation for 1968, this evaluation covers the third six months of operation of the Texas State Library Communication Network. Background information on the Network and the evaluation criteria are given. Data sources included Network Transaction sheets, questionnaires completed by Network

Texas State Library, Austin. Field Services Div.

53

Developing the National Communications and Information Infrastructure.  

ERIC Educational Resources Information Center

Discusses the importance of developing a national communications and information infrastructure to meet short-term needs. The Electronic Frontier Foundation's Open Platform Proposal, based on ISDN (Integrated Services Digital Network) is described, and recommendations for public policy criteria for evaluating infrastructure proposals are included.

Kapor, Mitchell; Weitzner, Daniel J.

1993-01-01

54

Communication and information technology in medical education  

Microsoft Academic Search

The past few years have seen rapid advances in communication and information technology (C&IT), and the pervasion of the worldwide web into everyday life has important implications for education. Most medical schools provide extensive computer networks for their students, and these are increasingly becoming a central component of the learning and teaching environment. Such advances bring new opportunities and challenges

Jeremy PT Ward; Jill Gordon; Michael J Field; Harold P Lehmann

2001-01-01

55

Data communication network at the ASRM facility  

NASA Astrophysics Data System (ADS)

This report describes the simulation of the overall communication network structure for the Advanced Solid Rocket Motor (ASRM) facility being built at Yellow Creek near Iuka, Mississippi as of today. The report is compiled using information received from NASA/MSFC, LMSC, AAD, and RUST Inc. As per the information gathered, the overall network structure will have one logical FDDI ring acting as a backbone for the whole complex. The buildings will be grouped into two categories viz. manufacturing intensive and manufacturing non-intensive. The manufacturing intensive buildings will be connected via FDDI to the Operational Information System (OIS) in the main computing center in B_1000. The manufacturing non-intensive buildings will be connected by 10BASE-FL to the OIS through the Business Information System (BIS) hub in the main computing center. All the devices inside B_1000 will communicate with the BIS. The workcells will be connected to the Area Supervisory Computers (ASCs) through the nearest manufacturing intensive hub and one of the OIS hubs. Comdisco's Block Oriented Network Simulator (BONeS) has been used to simulate the performance of the network. BONeS models a network topology, traffic, data structures, and protocol functions using a graphical interface. The main aim of the simulations was to evaluate the loading of the OIS, the BIS, and the ASCs, and the network links by the traffic generated by the workstations and workcells throughout the site.

Moorhead, Robert J., II; Smith, Wayne D.

1993-08-01

56

Data communication network at the ASRM facility  

NASA Technical Reports Server (NTRS)

This report describes the simulation of the overall communication network structure for the Advanced Solid Rocket Motor (ASRM) facility being built at Yellow Creek near Iuka, Mississippi as of today. The report is compiled using information received from NASA/MSFC, LMSC, AAD, and RUST Inc. As per the information gathered, the overall network structure will have one logical FDDI ring acting as a backbone for the whole complex. The buildings will be grouped into two categories viz. manufacturing intensive and manufacturing non-intensive. The manufacturing intensive buildings will be connected via FDDI to the Operational Information System (OIS) in the main computing center in B_1000. The manufacturing non-intensive buildings will be connected by 10BASE-FL to the OIS through the Business Information System (BIS) hub in the main computing center. All the devices inside B_1000 will communicate with the BIS. The workcells will be connected to the Area Supervisory Computers (ASCs) through the nearest manufacturing intensive hub and one of the OIS hubs. Comdisco's Block Oriented Network Simulator (BONeS) has been used to simulate the performance of the network. BONeS models a network topology, traffic, data structures, and protocol functions using a graphical interface. The main aim of the simulations was to evaluate the loading of the OIS, the BIS, and the ASCs, and the network links by the traffic generated by the workstations and workcells throughout the site.

Moorhead, Robert J., II; Smith, Wayne D.

1993-01-01

57

Multiple-Ring Digital Communication Network  

NASA Technical Reports Server (NTRS)

Optical-fiber digital communication network to support data-acquisition and control functions of electric-power-distribution networks. Optical-fiber links of communication network follow power-distribution routes. Since fiber crosses open power switches, communication network includes multiple interconnected loops with occasional spurs. At each intersection node is needed. Nodes of communication network include power-distribution substations and power-controlling units. In addition to serving data acquisition and control functions, each node acts as repeater, passing on messages to next node(s). Multiple-ring communication network operates on new AbNET protocol and features fiber-optic communication.

Kirkham, Harold

1992-01-01

58

Computing, Information and Communications Technology (CICT) Website  

NASA Technical Reports Server (NTRS)

The Computing, Information and Communications Technology Program (CICT) was established in 2001 to ensure NASA's Continuing leadership in emerging technologies. It is a coordinated, Agency-wide effort to develop and deploy key enabling technologies for a broad range of mission-critical tasks. The NASA CICT program is designed to address Agency-specific computing, information, and communications technology requirements beyond the projected capabilities of commercially available solutions. The areas of technical focus have been chosen for their impact on NASA's missions, their national importance, and the technical challenge they provide to the Program. In order to meet its objectives, the CICT Program is organized into the following four technology focused projects: 1) Computing, Networking and Information Systems (CNIS); 2) Intelligent Systems (IS); 3) Space Communications (SC); 4) Information Technology Strategic Research (ITSR).

Hardman, John; Tu, Eugene (Technical Monitor)

2002-01-01

59

NASA Integrated Space Communications Network  

NASA Technical Reports Server (NTRS)

The NASA Integrated Network for Space Communications and Navigation (SCaN) has been in the definition phase since 2010. It is intended to integrate NASA s three existing network elements, i.e., the Space Network, Near Earth Network, and Deep Space Network, into a single network. In addition to the technical merits, the primary purpose of the Integrated Network is to achieve a level of operating cost efficiency significantly higher than it is today. Salient features of the Integrated Network include (a) a central system element that performs service management functions and user mission interfaces for service requests; (b) a set of common service execution equipment deployed at the all stations that provides return, forward, and radiometric data processing and delivery capabilities; (c) the network monitor and control operations for the entire integrated network are conducted remotely and centrally at a prime-shift site and rotating among three sites globally (a follow-the-sun approach); (d) the common network monitor and control software deployed at all three network elements that supports the follow-the-sun operations.

Tai, Wallace; Wright, Nate; Prior, Mike; Bhasin, Kul

2012-01-01

60

Hubless satellite communications networks  

NASA Astrophysics Data System (ADS)

Frequency Comb Multiple Access (FCMA) is a new combined modulation and multiple access method which will allow cheap hubless Very Small Aperture Terminal (VSAT) networks to be constructed. Theoretical results show bandwidth efficiency and power efficiency improvements over other modulation and multiple access methods. Costs of the VSAT network are reduced dramatically since a hub station is not required.

Robinson, Peter Alan

1994-02-01

61

Hubless satellite communications networks  

NASA Technical Reports Server (NTRS)

Frequency Comb Multiple Access (FCMA) is a new combined modulation and multiple access method which will allow cheap hubless Very Small Aperture Terminal (VSAT) networks to be constructed. Theoretical results show bandwidth efficiency and power efficiency improvements over other modulation and multiple access methods. Costs of the VSAT network are reduced dramatically since a hub station is not required.

Robinson, Peter Alan

1994-01-01

62

77 FR 36305 - Stream Communications Network & Media, Inc.; Order of Suspension of Trading  

Federal Register 2010, 2011, 2012, 2013, 2014

...SECURITIES AND EXCHANGE COMMISSION...Stream Communications Network & Media, Inc...It appears to the Securities and Exchange Commission...information concerning the securities of Stream Communications Network & Media, Inc....

2012-06-18

63

The Shared Information Network.  

ERIC Educational Resources Information Center

Discusses the use of shared information networks within organizations to decrease information hoarding and maximize operating efficiencies. Network development issues discussed include choosing the department responsible for development, selecting information to be included in the network, designing the information format, distribution strategies,

Stanat, Ruth

1990-01-01

64

Data communication network at the ASRM facility  

NASA Technical Reports Server (NTRS)

The main objective of the report is to present the overall communication network structure for the Advanced Solid Rocket Motor (ASRM) facility being built at Yellow Creek near Iuka, Mississippi. This report is compiled using information received from NASA/MSFC, LMSC, AAD, and RUST Inc. As per the information gathered, the overall network structure will have one logical FDDI ring acting as a backbone for the whole complex. The buildings will be grouped into two categories viz. manufacturing critical and manufacturing non-critical. The manufacturing critical buildings will be connected via FDDI to the Operational Information System (OIS) in the main computing center in B 1000. The manufacturing non-critical buildings will be connected by 10BASE-FL to the Business Information System (BIS) in the main computing center. The workcells will be connected to the Area Supervisory Computers (ASCs) through the nearest manufacturing critical hub and one of the OIS hubs. The network structure described in this report will be the basis for simulations to be carried out next year. The Comdisco's Block Oriented Network Simulator (BONeS) will be used for the network simulation. The main aim of the simulations will be to evaluate the loading of the OIS, the BIS, the ASCs, and the network links by the traffic generated by the workstations and workcells throughout the site.

Moorhead, Robert J., II; Smith, Wayne D.; Nirgudkar, Ravi; Zhu, Zhifan; Robinson, Walter

1993-01-01

65

Data communication network at the ASRM facility  

NASA Astrophysics Data System (ADS)

The main objective of the report is to present the overall communication network structure for the Advanced Solid Rocket Motor (ASRM) facility being built at Yellow Creek near Iuka, Mississippi. This report is compiled using information received from NASA/MSFC, LMSC, AAD, and RUST Inc. As per the information gathered, the overall network structure will have one logical FDDI ring acting as a backbone for the whole complex. The buildings will be grouped into two categories viz. manufacturing critical and manufacturing non-critical. The manufacturing critical buildings will be connected via FDDI to the Operational Information System (OIS) in the main computing center in B 1000. The manufacturing non-critical buildings will be connected by 10BASE-FL to the Business Information System (BIS) in the main computing center. The workcells will be connected to the Area Supervisory Computers (ASCs) through the nearest manufacturing critical hub and one of the OIS hubs. The network structure described in this report will be the basis for simulations to be carried out next year. The Comdisco's Block Oriented Network Simulator (BONeS) will be used for the network simulation. The main aim of the simulations will be to evaluate the loading of the OIS, the BIS, the ASCs, and the network links by the traffic generated by the workstations and workcells throughout the site.

Moorhead, Robert J., II; Smith, Wayne D.; Nirgudkar, Ravi; Zhu, Zhifan; Robinson, Walter

1993-02-01

66

Communications for unattended sensor networks  

NASA Astrophysics Data System (ADS)

The future model of the US Army's Future Combat Systems (FCS) and the Future Force reflects a combat force that utilizes lighter armor protection than the current standard. Survival on the future battlefield will be increased by the use of advanced situational awareness provided by unattended tactical and urban sensors that detect, identify, and track enemy targets and threats. Successful implementation of these critical sensor fields requires the development of advanced sensors, sensor and data-fusion processors, and a specialized communications network. To ensure warfighter and asset survivability, the communications must be capable of near real-time dissemination of the sensor data using robust, secure, stealthy, and jam resistant links so that the proper and decisive action can be taken. Communications will be provided to a wide-array of mission-specific sensors that are capable of processing data from acoustic, magnetic, seismic, and/or Chemical, Biological, Radiological, and Nuclear (CBRN) sensors. Other, more powerful, sensor node configurations will be capable of fusing sensor data and intelligently collect and process data images from infrared or visual imaging cameras. The radio waveform and networking protocols being developed under the Soldier Level Integrated Communications Environment (SLICE) Soldier Radio Waveform (SRW) and the Networked Sensors for the Future Force Advanced Technology Demonstration are part of an effort to develop a common waveform family which will operate across multiple tactical domains including dismounted soldiers, ground sensor, munitions, missiles and robotics. These waveform technologies will ultimately be transitioned to the JTRS library, specifically the Cluster 5 requirement.

Nemeroff, Jay L.; Angelini, Paul; Orpilla, Mont; Garcia, Luis; DiPierro, Stefano

2004-07-01

67

Congenital Heart Information Network  

MedlinePLUS

... heart defects. Important Notice The Congenital Heart Information Network website is temporarily out of service. Please join ... and Uwe Baemayr for The Congenital Heart Information Network Exempt organization under Section 501(c)3. Copyright ...

68

VSAT communications networks - An overview  

NASA Astrophysics Data System (ADS)

The very-small-aperture-terminal (VSAT) fixed satellite communication network is a star network in which many dispersed micro terminals attempt to send data in a packet form through a random access/time-division multiple-access (RA/TDMA) satellite channel with transmission delay. The basic concept of the VSAT and its service potential are discussed. Two classes of traffic are addressed, namely, business-oriented low-rate-data traffic and bulk data traffic of corporate networks. Satellite access, throughput, and delay are considered. The size of the network population that can be served in an RA/TDMA environment is calculated. User protocols are examined. A typical VSAT business scenario is described.

Chakraborty, D.

1988-05-01

69

Weather Information Communications (WINCOMM) Overview and Status  

NASA Technical Reports Server (NTRS)

The second annual project review of Weather Information Communications (WINCOMM) is presented. The topics of discussion include: 1) In-Flight Weather Information; 2) System Elements; 3) Technology Investment Areas; 4) NAS Information Exchange; 5) FIS Datalink Architecture Analyses; 6) Hybrid FIS Datalink Architecture; 7) FIS Datalink Architecture Analyses; 8) Air Transport: Ground and Satellite-based Datalinks; 9) General Aviation: Ground and Satellite-based Datalinks; 10) Low Altitude AutoMET Reporting; 11) AutoMET: Airborne-based Datalinks; 12) Network Protocols Development; and 13) FAA/NASA Collaboration. A summary of WINCOMM is also included. This paper is in viewgraph form.

Martzaklis, K.

2003-01-01

70

Recovery Protocol for Dynamic Network Reconstruction on Disaster Information System  

Microsoft Academic Search

So far, we have developed effective wide area disaster information network (WDN) using Internet over the combination of both wired and wireless network. In this information network, two important functions including resident safety information system and bidirectional video communication system between evacuation places and disaster information center are provided. However, in this WDM, system failure of network and computing facilities

Hideaki Asahi; Kazuo Takahata; Yoshitaka Shibata

2004-01-01

71

Information and Communications Technologies (ICT) Center Print Publications  

NSDL National Science Digital Library

This website from the Information and Communication Technology (ICT) Center provides a list of print publications from the ICT Center Delmar Learning Series, created by Delmar Learning and the ICT Center. Titles include Introduction to Telecommunications Networks, Basic Telecommunications: The Physical Layer, Fiber Optic Communications and Network Security. The listings for each book include links to information and sample chapters on Delmar Learning's website, as well as links to order the titles on Amazon.com.

72

Communication through Resonance in Spiking Neuronal Networks  

PubMed Central

The cortex processes stimuli through a distributed network of specialized brain areas. This processing requires mechanisms that can route neuronal activity across weakly connected cortical regions. Routing models proposed thus far are either limited to propagation of spiking activity across strongly connected networks or require distinct mechanisms that create local oscillations and establish their coherence between distant cortical areas. Here, we propose a novel mechanism which explains how synchronous spiking activity propagates across weakly connected brain areas supported by oscillations. In our model, oscillatory activity unleashes network resonance that amplifies feeble synchronous signals and promotes their propagation along weak connections (communication through resonance). The emergence of coherent oscillations is a natural consequence of synchronous activity propagation and therefore the assumption of different mechanisms that create oscillations and provide coherence is not necessary. Moreover, the phase-locking of oscillations is a side effect of communication rather than its requirement. Finally, we show how the state of ongoing activity could affect the communication through resonance and propose that modulations of the ongoing activity state could influence information processing in distributed cortical networks. PMID:25165853

Frgnac, Yves; Aertsen, Ad; Kumar, Arvind

2014-01-01

73

Sensor information networking architecture and applications  

Microsoft Academic Search

This article introduces a sensor information networking architecture, called SINA, that facilitates querying, monitoring, and tasking of sensor networks. SINA serves the role of middleware that abstracts a network of sensor nodes as a collection of massively distributed objects. SINA's execution environment provides a set of configuration and communication primitives that enable scalable and energy-efficient organization of and interactions among

Chien-Chung Shen; Chavalit Srisathapornphat; Chaiporn Jaikaeo

2001-01-01

74

SECURITY AND COMMUNICATION NETWORKS Security Comm. Networks. 2008; 1:375388  

E-print Network

SECURITY AND COMMUNICATION NETWORKS Security Comm. Networks. 2008; 1:375­388 Published online 2 of secure web based m-health services utilizing XML based security models Demosthenes Vouyioukas*,y , George of Information and Communication Systems Engineering, University of the Aegean, GR-83200 Samos, Greece Summary

Vouyioukas, Demosthenes

75

Communicability reveals a transition to coordinated behavior in multiplex networks  

NASA Astrophysics Data System (ADS)

We analyze the flow of information in multiplex networks by means of the communicability function. First, we generalize this measure from its definition from simple graphs to multiplex networks. Then, we study its relevance for the analysis of real-world systems by studying a social multiplex where information flows using formal-informal channels and an air transportation system where the layers represent different air companies. Accordingly, the communicability, which is essential for the good performance of these complex systems, emerges at a systemic operation point in the multiplex where the performance of the layers operates in a coordinated way very differently from the state represented by a collection of unconnected networks.

Estrada, Ernesto; Gmez-Gardees, Jess

2014-04-01

76

Networked UAV Command, Control and Communication  

E-print Network

Networked UAV Command, Control and Communication Jack Elston , Eric Frew , Brian Argrow University of Colorado, Boulder, CO, 80309, USA The networked UAV command, control, and communication project for UAVs. The system utilizes an existing ad-hoc network to demonstrate the ability of UAVs to make mission

Frew, Eric W.

77

HICCUPS: Hidden Communication System for Corrupted Networks  

Microsoft Academic Search

This article presents HICCUPS (HIdden Communication system for CorrUPted networkS), a steganographic system dedicated to shared medium networks including wireless local area networks. The novelty of HICCUPS is: usage of secure telecommunications network armed with cryptographic mechanisms to provide steganographic system and proposal of new protocol with bandwidth allocation based on corrupted frames. All functional parts of the system and

KRZYSZTOF SZCZYPIORSKI

78

College of Communication and Information COM Communication  

E-print Network

COMMUNICATION SKILLS. (1) Introduces students to fundamental oral communication skills needed to prepare, Basic Public Speaking. It will count toward partial completion of the oral communication skills-based approach. Students will be exposed to cultural communication situations and will apply skills using lecture

MacAdam, Keith

79

On the processing of metabolic information through metabolite-gene communication networks: an approach for modelling causality.  

PubMed

Gene-metabolite correlation networks of three independent biological systems were interrogated using an approach to define, and subsequently model, causality. The major goal of this work was to analyse how information from those metabolites, that displayed a rapid response to perturbation of the biological system, is processed through the response network to provide signal-specific adaptation of metabolism. For this purpose, comparison of network topologies was carried out on three different groups of system elements: transcription factors, other genes and metabolites, with special emphasis placed on those features which are possible sites of metabolic regulation or response propagation. The degree of connectivity in all three analysed gene-metabolite networks followed power-law and exponential functions, whilst a comparison of connectivities of the various cellular entities suggested, that metabolites are less involved in the regulation of the sulfur stress response than in the ripening of tomatoes (in which metabolites seem to have an even greater regulatory role than transcription factors). These findings reflect different degree of metabolic regulation for distinct biological processes. Implementing causality into the network allowed classification of metabolite-gene associations into those with causal directionality from gene to metabolite and from metabolite to gene. Several metabolites were positioned relatively early in the causal hierarchy and possessed many connections to the downstream elements. Such metabolites were considered to have higher regulatory potential. For the biological example of hypo-sulfur stress response in Arabidopsis, the highest regulatory potential scores were established for fructose and sucrose, isoleucine, methionine and sinapic acid. Further developments in profiling techniques will allow greater cross-systems comparisons, necessary for reliability and universality checks of inferred regulatory capacities of the particular metabolites. PMID:17544461

Szymanski, Jedrzej; Bielecka, Monika; Carrari, Fernando; Fernie, Alisdair R; Hoefgen, Rainer; Nikiforova, Victoria J

2007-01-01

80

On traffic analysis in anonymous communication networks  

E-print Network

In this dissertation, we address issues related to traffic analysis attacks and the engineering in anonymous communication networks. Mixes have been used in many anonymous communication systems and are supposed to provide countermeasures that can...

Zhu, Ye

2009-06-02

81

Information & Communication Technology Emergency Instructions  

E-print Network

Information & Communication Technology Emergency Instructions In the event of an EMERGENCY dial 403-220-5333 for Campus Security or dial 9-1-1 for Police, Fire or Ambulance Additional emergency instructions is found the area for Campus Security or emergency services to arrive Evacuation Procedures Activate the NEAREST

de Leon, Alex R.

82

The Changing Face of Africa's Information and Communication Scenario.  

ERIC Educational Resources Information Center

Provides a glimpse of the prevailing situation in the field of information and communication in African countries; reports on recent surveys and case studies which indicate both problems and encouraging efforts. Discusses developments of international and national electronic communication networks which indicate rapid changes in electronic

Chowdhury, G. G.

1998-01-01

83

PIPELINES AS COMMUNICATION NETWORK LINKS  

SciTech Connect

This report presents the results of an investigation into two methods of using the natural gas pipeline as a communication medium. The work addressed the need to develop secure system monitoring and control techniques between the field and control centers and to robotic devices in the pipeline. In the first method, the pipeline was treated as a microwave waveguide. In the second method, the pipe was treated as a leaky feeder or a multi-ground neutral and the signal was directly injected onto the metal pipe. These methods were tested on existing pipeline loops at UMR and Batelle. The results reported in this report indicate the feasibility of both methods. In addition, a few suitable communication link protocols for this network were analyzed.

Kelvin T. Erickson; Ann Miller; E. Keith Stanek; C.H. Wu; Shari Dunn-Norman

2005-03-14

84

Communications network design and costing model users manual  

NASA Technical Reports Server (NTRS)

The information and procedures needed to exercise the communications network design and costing model for performing network analysis are presented. Specific procedures are included for executing the model on the NASA Lewis Research Center IBM 3033 computer. The concepts, functions, and data bases relating to the model are described. Model parameters and their format specifications for running the model are detailed.

Logan, K. P.; Somes, S. S.; Clark, C. A.

1983-01-01

85

Performance studies of Low Earth Orbit Satellite (LEOS) communication networks for global communications  

SciTech Connect

Communicating appropriate information to desired destinations is of critical importance to the Air Force and the Department of Defense (DoD). The communications infrastructure used to provide this information must be reliable and also efficient in terms of minimizing delay. Additionally, {open_quotes}anytime and anywhere{close_quotes} communication capabilities are desired of the infrastructure. In order to provide global communications, satellite communication systems must be used for primary as well as supplemental communication mediums. Satellite communication systems can be used to provide the infrastructure with the {open_quotes}anytime and anywhere{close_quotes} capability. Recent advances in microelectronic and cellular radio technologies have allowed for the proposed implementation of low earth orbit satellite (LEOS) communication networks for global personal communications. This paper examines the performance of LEOS networks in a packet-switched environment. Performance is defined here in terms of link availability and reliability in a faulty environment. An overview of LEOS systems is provided, as well as critical issues associated with the implementation of such a system. To illustrate the nature of LEOS network communications, the commercially proposed system Iridium is examined. {copyright} {ital 1997 American Institute of Physics.}

Raines, R.A.; Janoso, R.F.; Stenger, D.K. [Department of Electrical and Computer Engineering Air Force Institute of Technology Wright-Patterson AFB, Ohio45433-7765 (United States)

1997-01-01

86

75 FR 49870 - Effects on Broadband Communications Networks of Damage to or Failure of Network Equipment or...  

Federal Register 2010, 2011, 2012, 2013, 2014

...Network Equipment or Severe Overload AGENCY: Federal Communications...submitting comments and additional information on the notice process, see the SUPPLEMENTARY INFORMATION section of this document. FOR FURTHER INFORMATION CONTACT: Jeffery...

2010-08-16

87

Direct Information Exchange in Wireless Networks: A Coding Perspective  

E-print Network

information exchange problems. First, algorithms are presented to increase the efficiency of cooperative communication in a network where the clients can communicate with each other through a broadcast channel. These algorithms are designed to minimize...

Ozgul, Damla

2011-10-21

88

Effective Protocols for Mobile Communications and Networking  

SciTech Connect

This report examines methods of mobile communications with an emphasis on mobile computing and wireless communications. Many of the advances in communications involve the use of Internet Protocol (IP), Asynchronous Transfer Mode (ATM), and ad hoc network protocols. However, many of the advances in these protocols have been focused on wired communications. Recently much focus has been directed at advancing communication technology in the area of mobile wireless networks. This report discusses various protocols used in mobile communications and proposes a number of extensions to existing protocols. A detailed discussion is also included on desirable protocol characteristics and evaluation criteria. In addition, the report includes a discussion on several network simulation tools that maybe used to evaluate network protocols.

Espinoza, J.; Sholander, P.; Van Leeuwen, B,

1998-12-01

89

Recent advances in underwater acoustic communications & networking  

Microsoft Academic Search

The past three decades have seen a growing interest in underwater acoustic communications. Continued research over the years has resulted in improved performance and robustness as compared to the initial communication systems. Research has expanded from point-to-point communications to include underwater networks as well. A series of review papers provide an excellent history of the development of the field until

Mandar Chitre; Shiraz Shahabudeen; Lee Freitag; Milica Stojanovic

2008-01-01

90

China Communications August 2006 27 Feature Articles: Network Security  

E-print Network

China Communications August 2006 27 Feature Articles: Network Security ABSTRACT Worms spread@engr.smu.edu FEATURE ARTICLES #12;China Communications August 200628 Feature Articles: Network Security outcome

Chen, Thomas M.

91

Center for Information & Communications Technology ResearchCenter for Information & Communications Technology Research (CICTR)(CICTR)  

E-print Network

Electronic Exchanges & Optical Systems & RF TechnologyComputers Wireless Multimedia Communications #12;NextCenter for Information & Communications Technology ResearchCenter for Information & Communications Technology Research (CICTR)(CICTR) Dept. of Electrical EngineeringDept. of Electrical Engineering

Yener, Aylin

92

PESTICIDE INFORMATION NETWORK  

EPA Science Inventory

The Pesticide Information Network (PIN) is an interactive database containing information about pesticides. PIN is a free service offered by the USEPAs Office of Pesticide Programs which provides contacts on pesticide issues, has a bulletin board network for public and private us...

93

Information Horizons in Networks  

Microsoft Academic Search

We investigate and quantify the interplay between topology and ability to\\u000asend specific signals in complex networks. We find that in a majority of\\u000ainvestigated real-world networks the ability to communicate is favored by the\\u000anetwork topology on small distances, but disfavored at larger distances. We\\u000afurther discuss how the ability to locate specific nodes can be improved if\\u000ainformation

A. Trusina; M. Rosvall; K. Sneppen

2004-01-01

94

Extracting association patterns in network communications.  

PubMed

In network communications, mixes provide protection against observers hiding the appearance of messages, patterns, length and links between senders and receivers. Statistical disclosure attacks aim to reveal the identity of senders and receivers in a communication network setting when it is protected by standard techniques based on mixes. This work aims to develop a global statistical disclosure attack to detect relationships between users. The only information used by the attacker is the number of messages sent and received by each user for each round, the batch of messages grouped by the anonymity system. A new modeling framework based on contingency tables is used. The assumptions are more flexible than those used in the literature, allowing to apply the method to multiple situations automatically, such as email data or social networks data. A classification scheme based on combinatoric solutions of the space of rounds retrieved is developed. Solutions about relationships between users are provided for all pairs of users simultaneously, since the dependence of the data retrieved needs to be addressed in a global sense. PMID:25679311

Portela, Javier; Villalba, Luis Javier Garca; Trujillo, Alejandra Guadalupe Silva; Orozco, Ana Lucila Sandoval; Kim, Tai-Hoon

2015-01-01

95

The National Biomedical Communications Network as a Developing Structure *  

PubMed Central

The National Biomedical Communications Network has evolved both from a set of conceptual recommendations over the last twelve years and an accumulation of needs manifesting themselves in the requests of members of the medical community. With a short history of three years this network and its developing structure have exhibited most of the stresses of technology interfacing with customer groups, and of a structure attempting to build itself upon many existing fragmentary unconnected segments of a potentially viable resourcesharing capability. In addition to addressing these topics, the paper treats a design appropriate to any network devoted to information transfer in a special interest user community. It discusses fundamentals of network design, highlighting that network structure most appropriate to a national information network. Examples are given of cost analyses of information services and certain conjectures are offered concerning the roles of national networks. PMID:5542912

Davis, Ruth M.

1971-01-01

96

Validation of network communicability metrics for the analysis of brain structural networks.  

PubMed

Computational network analysis provides new methods to analyze the brain's structural organization based on diffusion imaging tractography data. Networks are characterized by global and local metrics that have recently given promising insights into diagnosis and the further understanding of psychiatric and neurologic disorders. Most of these metrics are based on the idea that information in a network flows along the shortest paths. In contrast to this notion, communicability is a broader measure of connectivity which assumes that information could flow along all possible paths between two nodes. In our work, the features of network metrics related to communicability were explored for the first time in the healthy structural brain network. In addition, the sensitivity of such metrics was analysed using simulated lesions to specific nodes and network connections. Results showed advantages of communicability over conventional metrics in detecting densely connected nodes as well as subsets of nodes vulnerable to lesions. In addition, communicability centrality was shown to be widely affected by the lesions and the changes were negatively correlated with the distance from lesion site. In summary, our analysis suggests that communicability metrics that may provide an insight into the integrative properties of the structural brain network and that these metrics may be useful for the analysis of brain networks in the presence of lesions. Nevertheless, the interpretation of communicability is not straightforward; hence these metrics should be used as a supplement to the more standard connectivity network metrics. PMID:25549088

Andreotti, Jennifer; Jann, Kay; Melie-Garcia, Lester; Giezendanner, Stphanie; Abela, Eugenio; Wiest, Roland; Dierks, Thomas; Federspiel, Andrea

2014-01-01

97

Validation of Network Communicability Metrics for the Analysis of Brain Structural Networks  

PubMed Central

Computational network analysis provides new methods to analyze the brain's structural organization based on diffusion imaging tractography data. Networks are characterized by global and local metrics that have recently given promising insights into diagnosis and the further understanding of psychiatric and neurologic disorders. Most of these metrics are based on the idea that information in a network flows along the shortest paths. In contrast to this notion, communicability is a broader measure of connectivity which assumes that information could flow along all possible paths between two nodes. In our work, the features of network metrics related to communicability were explored for the first time in the healthy structural brain network. In addition, the sensitivity of such metrics was analysed using simulated lesions to specific nodes and network connections. Results showed advantages of communicability over conventional metrics in detecting densely connected nodes as well as subsets of nodes vulnerable to lesions. In addition, communicability centrality was shown to be widely affected by the lesions and the changes were negatively correlated with the distance from lesion site. In summary, our analysis suggests that communicability metrics that may provide an insight into the integrative properties of the structural brain network and that these metrics may be useful for the analysis of brain networks in the presence of lesions. Nevertheless, the interpretation of communicability is not straightforward; hence these metrics should be used as a supplement to the more standard connectivity network metrics. PMID:25549088

Andreotti, Jennifer; Jann, Kay; Melie-Garcia, Lester; Giezendanner, Stphanie; Abela, Eugenio; Wiest, Roland; Dierks, Thomas; Federspiel, Andrea

2014-01-01

98

Safety Information Dissemination in Vehicular Networks using Facilities Layer Mechanisms  

E-print Network

networks of vehicles, in which moving cars are nodes that communicate with each other and, possibly, published in "IEEE Wireless Communications and Networking Conference (WCNC) (2014)" #12;Mohammad Irfan KhanSafety Information Dissemination in Vehicular Networks using Facilities Layer Mechanisms Mohammad

Boyer, Edmond

99

77 FR 16837 - Information Collection Being Reviewed by the Federal Communications Commission Under Delegated...  

Federal Register 2010, 2011, 2012, 2013, 2014

...information burden for small business concerns with fewer...Herman, Federal Communications Commission, via the...collection. Respondents: Business or other for-profit...equal access to all the basic underlying network...payphones. Federal Communications Commission....

2012-03-22

100

A security architecture for health information networks.  

PubMed

Health information network security needs to balance exacting security controls with practicality, and ease of implementation in today's healthcare enterprise. Recent work on 'nationwide health information network' architectures has sought to share highly confidential data over insecure networks such as the Internet. Using basic patterns of health network data flow and trust models to support secure communication between network nodes, we abstract network security requirements to a core set to enable secure inter-network data sharing. We propose a minimum set of security controls that can be implemented without needing major new technologies, but yet realize network security and privacy goals of confidentiality, integrity and availability. This framework combines a set of technology mechanisms with environmental controls, and is shown to be sufficient to counter commonly encountered network security threats adequately. PMID:18693862

Kailar, Rajashekar; Muralidhar, Vinod

2007-01-01

101

Internetworking satellite and local exchange networks for personal communications applications  

NASA Technical Reports Server (NTRS)

The demand for personal communications services has shown unprecedented growth, and the next decade and beyond promise an era in which the needs for ubiquitous, transparent and personalized access to information will continue to expand in both scale and scope. The exchange of personalized information is growing from two-way voice to include data communications, electronic messaging and information services, image transfer, video, and interactive multimedia. The emergence of new land-based and satellite-based wireless networks illustrates the expanding scale and trend toward globalization and the need to establish new local exchange and exchange access services to meet the communications needs of people on the move. An important issue is to identify the roles that satellite networking can play in meeting these new communications needs. The unique capabilities of satellites, in providing coverage to large geographic areas, reaching widely dispersed users, for position location determination, and in offering broadcast and multicast services, can complement and extend the capabilities of terrestrial networks. As an initial step in exploring the opportunities afforded by the merger of satellite-based and land-based networks, several experiments utilizing the NASA ACTS satellite and the public switched local exchange network were undertaken to demonstrate the use of satellites in the delivery of personal communications services.

Wolff, Richard S.; Pinck, Deborah

1993-01-01

102

Review and evaluation of security threats on the communication networks in the smart grid  

Microsoft Academic Search

The smart grid, generally referred to as the next-generation power electric system, relies on robust communication networks to provide efficient, secure, and reliable information delivery. Thus, the network security is of critical importance in the smart grid. In this paper, we aim at classifying and evaluating the security threats on the communication networks in the smart grid. Based on a

Zhuo Lu; Xiang Lu; Wenye Wang; C. Wang

2010-01-01

103

UNINTERRUPTED NETWORK COMMUNICATION WITH EFFICIENT RESOURCE UTILIZATION  

E-print Network

A challenging issue for network communication is to provide uninterrupted network services even when a link failure occurs. Path protection offers a promising solution by employing a link-disjoint secondary backup path to protect the primary path. Existing path protection mechanisms can be classified into 1+1 protection, 1:1 protection 1:N protection and M:N protection. However, their implementation either consumes too much network resources, or cannot respond to link failure quickly enough without much awareness of users. In this paper, a resourceefficient protection scheme, referred to as ?+1 protection, is introduced. In ?+1 protection, only critical information of the primary path is duplicated and transferred through the secondary path. The benefit of ?+1 protection is twofold. Firstly, it reduces the redundancy of data transmission, and hence improves the efficiency of resource utilization. Secondly, ? is a flexible parameter that can be adjusted according to the requirements of different services or networks. Index Terms Link-disjoint paths, path protection, QOS, reliable routing

Ming-lee Gan; Soung-yue Liew

104

Great Lakes Information Network  

NSDL National Science Digital Library

The Great Lakes Information Network (GLIN) is a partnership that has compiled information relating to the binational Great Lakes-St. Lawrence region of North America. Sections of the site include an overview of the Great Lakes, the environment of the Great Lakes, the economy of the Great Lakes, education, maps and Geographic Information Systems (GIS), and tourism.

2007-10-26

105

Great Lakes Information Network  

NSDL National Science Digital Library

The Great Lakes Information Network (GLIN) is a partnership that has compiled information relating to the binational Great Lakes-St. Lawrence region of North America. Sections of the site include an overview of the Great Lakes, the environment of the Great Lakes, the economy of the Great Lakes, education, maps and Geographic Information Systems (GIS), and tourism.

106

Networks and our Limited Information Horizon  

Microsoft Academic Search

In this paper we quantify our limited information horizon, by measuring the\\u000ainformation necessary to locate specific nodes in a network. To investigate\\u000adifferent ways to overcome this horizon, and the interplay between\\u000acommunication and topology in social networks, we let agents communicate in a\\u000amodel society. Thereby they build a perception of the network that they can use\\u000ato

M. Rosvall; K. Sneppen

2007-01-01

107

Child Rights Information Network Newsletter, 1997.  

ERIC Educational Resources Information Center

These three newsletter issues communicate activities of the Child Rights Information Network (CRIN) and report on information resources and worldwide activities concerning children and child rights. The January 1997 issue profiles CRIN members in Costa Rica, Tanzania, Germany, and Switzerland; and provides updates on the activities of projects

Purbrick, Becky, Ed.

1997-01-01

108

EUROPEAN COMMISSION ICT -INFORMATION AND COMMUNICATION TECHNOLOGIES  

E-print Network

EUROPEAN COMMISSION ICT - INFORMATION AND COMMUNICATION TECHNOLOGIES A thematic priority and Communication Technologies ......................................................... 4 1 Objective sustainable and personalised healthcare ....................... 34 3.6 Challenge 6: ICT for Mobility

Meju, Max

109

National Network for Immunization Information  

MedlinePLUS

The National Network for Immunization Information (NNii) provides up-to-date, science-based information to healthcare professionals, the media, and the ... Fever Varicella (Chickenpox) Yellow Fever Copyright 2010. National Network for Immunization Information (NNii). The information contained in ...

110

STRUCTURE AND COMMUNICATION IN COMPLEX NETWORKS  

Microsoft Academic Search

Networks is tool to describe systems composed of many different units which each typically interact with a few of the other\\u000a units. Networks thus used to quantify complex systems from the intricate interactions of proteins inside a living cell, to\\u000a ecosystems, social systems and computer networks. In most cases the network quantify communication channels in the system.\\u000a Thus directly connected

KIM SNEPPEN

111

The Operation of a Specialized Scientific Information and Data Analysis Center With Computer Base and Associated Communications Network.  

ERIC Educational Resources Information Center

The Nuclear Safety Information Center (NSIC) is a highly sophisticated scientific information center operated at Oak Ridge National Laboratory (ORNL) for the U.S. Atomic Energy Commission. Its information file, which consists of both data and bibliographic information, is computer stored and numerous programs have been developed to facilitate the

Cottrell, William B.; And Others

112

Environmental Uncertainty and Communication Network Complexity: A Cross-System, Cross-Cultural Test.  

ERIC Educational Resources Information Center

An infographic model is proposed to account for the operation of systems within their information environments. Infographics is a communication paradigm used to indicate the clustering of information processing variables in communication systems. Four propositions concerning environmental uncertainty and internal communication network complexity,

Danowski, James

113

Laser satellite communication network-vibration effect and possible solutions  

Microsoft Academic Search

A number of serious consortiums develop satellite communication networks. The objective of these communication projects is to service personal communication users almost everywhere on Earth. The intersatellite links in those projects use microwave radiation as the carrier. Free-space optical communication between satellites networked together can make possible high-speed communication between different places on Earth. Some advantages of an optical communication

SHLOMI ARNON; N. S. Kopeika

1997-01-01

114

Optimizing secure communication standards for disadvantaged networks  

E-print Network

We present methods for optimizing standardized cryptographic message protocols for use on disadvantaged network links. We first provide an assessment of current secure communication message packing standards and their ...

Okano, Stephen Hiroshi

2009-01-01

115

[Modern network technologies for data communication in the hospital].  

PubMed

Modern network technologies provide the basic infrastructure for information and communication systems in the hospital today. The goal to build up a universal network infrastructure which meets the broadly varied requirements. Analysis of data communication in the hospital and the evaluation of established network technologies, as well as new developments, leads to the switching concept as the suitable solution. Two technologies play the major role in building enterprise networks: the Ethernet family, based on frame switching, and ATM, based on cell switching. Orientation on established standards is the key to free system choice and grants interoperability between systems from different manufacturers. However, the network design must meet the application and system architecture of the information technology in order to achieve successful mapping of the involved communication profiles. This means scaling of the bandwidth as needed, suitable segmenting of the network and resilient links. In a further step, policy-based networking takes advantages of prioritizing critical applications and therefore reduces interdependencies across the network. PMID:10337699

Pelikan, E; Kotter, E; Jger, D; Langer, M; Timmermann, U

1999-04-01

116

Net-centric optical communication for the global information grid  

NASA Astrophysics Data System (ADS)

Optical communications technologies are being actively explored by the defense and security communities as a potential solution to alleviate bandwidth bottlenecks and to provide covert, jam resistant communications without spectrum restrictions. While static fiber-optic networks are widely deployed in the Department of Defense (DoD) communications network, the integration of wireless, free space optical (FSO) communications technology is required to provide end-to-end high bandwidth paths to support mobile defense and security operations. This paper presents an analysis of inherent benefits of optical wireless communications technologies in enabling net-centric applications and discusses specific technology and architectural challenges that need to be overcome before these technologies can be seamlessly integrated in the Global Information Grid (GIG) to fully realize the net-centric vision.

Dwivedi, Anurag

2006-05-01

117

Earth System Science Informal Education Network (ESSIEN)  

NSDL National Science Digital Library

The Earth System Science Informal Education Network (ESSIEN) is dedicated to improving Earth system literacy through increased communication and collaboration among providers of informal Earth system education. The collection is designed for museum professionals (educators, exhibits designers, developers) as a resource of ideas, tools, traveling exhibits and online materials. The resources are web portals to organizations providing substantial informal Earth system science education. They describe educational programming, resources and exhibits that are pertinent to an informal educator.

118

Earth System Science Informal Education Network (ESSIEN)  

NSDL National Science Digital Library

The Earth System Science Informal Education Network (ESSIEN) is dedicated to improving Earth system literacy through increased communication and collaboration among providers of informal Earth system education. The collection is designed for museum professionals (educators, exhibits designers, developers) as a resource of ideas, tools, traveling exhibits and online materials. The resources are web portals to organizations providing substantial informal Earth system science education. They describe educational programming, resources and exhibits that are pertinent to an informal educator.

2007-04-03

119

College of Communication and Information IS Information Studies  

E-print Network

College of Communication and Information IS Information Studies KEY: # = new course * = course changed = course dropped University of Kentucky 2013-2014 Undergraduate Bulletin 1 IS 200 INFORMATION of information literacy. It explores how to effectively and ethically find

MacAdam, Keith

120

Quantum secure direct communication network with hyperentanglement  

NASA Astrophysics Data System (ADS)

We propose a quantum secure direct communication protocol with entanglement swapping and hyperentanglement. Any two users, Alice and Bob, can communicate with each other in a quantum network, even though there is no direct quantum channel between them. The trust center, Trent, who provides a quantum channel to link them by performing entanglement swapping, cannot eavesdrop on their communication. This protocol provides a high channel capacity because it uses hyperentanglement, which can be generated using a beta barium borate crystal.

Chang, Ho Hong; Jino, Heo; Jong In, Lim; Hyung, Jin Yang

2014-09-01

121

Structure and evolution of communication networks in organizations  

E-print Network

We study three types of communication data--emails, phone calls, and meetings-in a modern IT firm. Using network descriptive statistics, we show how communication networks in an organization differ from random networks and ...

Qian, Jichao, M. Eng. Massachusetts Institute of Technology

2008-01-01

122

Information transfer among widely spaced individuals: latrines as a basis for communication networks in the swift fox?  

Microsoft Academic Search

In species where individuals are widely spaced instantaneous signals cannot readily form the basis of com- munication networks, that is several individuals within signalling range of each other. However, markings, signals that remain in the environment after the signaller has left, may fulfil this role. In this study, we have investigated the possible function of swift fox, Vulpes velox, latrines,

Safi K. Darden; Lise K. Steffensen; Torben Dabelsteen

2008-01-01

123

Communicability reveals a transition to coordinated behavior in multiplex networks.  

PubMed

We analyze the flow of information in multiplex networks by means of the communicability function. First, we generalize this measure from its definition from simple graphs to multiplex networks. Then, we study its relevance for the analysis of real-world systems by studying a social multiplex where information flows using formal-informal channels and an air transportation system where the layers represent different air companies. Accordingly, the communicability, which is essential for the good performance of these complex systems, emerges at a systemic operation point in the multiplex where the performance of the layers operates in a coordinated way very differently from the state represented by a collection of unconnected networks. PMID:24827305

Estrada, Ernesto; Gmez-Gardees, Jess

2014-04-01

124

A Communication Network for Educational Researchers.  

ERIC Educational Resources Information Center

Discusses application of microcomputer technology to educational research and describes the possible uses of computer networking for communication with colleagues. Focuses on the organization and structure of the Education Research Forum on CompuServe. Considers advantages and costs of networking in general and for the American Educational

Pierce, Jean; Cooley, William W.

1985-01-01

125

TACNET: Mobile ad hoc Secure Communications Network  

Microsoft Academic Search

On the road and during tactical maneuvers, the Blue Force must maintain situational awareness to effectively react and respond. The Tactical Network, or TacNet, is a mobile ad hoc communications network developed by Sandia National Laboratories to provide Blue Force personnel with secure access to critical data, such as real-time maps of resource positions. During development of the system, the

L. E. Riblett; J. M. Wiseman

2007-01-01

126

Multigate Communication Network for Smart Grid  

Microsoft Academic Search

It is envisioned that one of the most important issues in smart grid will be to design a network architecture that is capable of providing secure and reliable two-way com- munication from meters to other Smart Grid domains. While networking technologies and systems have been greatly en- hanced, in wireless communication environments the smart grid faces new challenges in terms

Hamid Gharavi; Bin Hu

2011-01-01

127

Modeling and Performance Analysis of Communication Networks  

E-print Network

. The underlying principles of computer systems analysis (which are based on queuing theory) will be studied. Analytical methods based on queuing theory will be used to study the behavior of communication networks, for example, the time spent by a packet waiting to be transmitted on a given link or through a whole network

Xie,Jiang (Linda)

128

Iowa Communications Network Enhancing Education in Iowa.  

ERIC Educational Resources Information Center

Describes the Iowa Communications Network, a statewide fiber optic network capable of transporting interactive, two-way audio, video, voice, and data signals. Topics include statewide cooperation among educational and state organizations; classroom design, including interactive classrooms; access to the Internet; and use by noneducational

Ivanovic, Greta

1995-01-01

129

Stress Testing of Data-Communication Networks  

NASA Technical Reports Server (NTRS)

NetStress is a computer program that stress-tests a data-communication network and components thereof. NetStress comprises two components running, respectively, in a transmitting system and a receiving system connected to a network under test

Leucht, Kurt; Bedette, Guy

2006-01-01

130

Digital communication of voice: development of Integrated Services Digital Networks (ISDN) and its implications for Information Management  

Microsoft Academic Search

The implementation of a digital switched transmission net work, whilst primarily for voice, offers several advantages over the traditional analogue mode of transmission. One of the most important benefits to be offered by digital switched networks is that they provide the opportunity for the integration of a whole range of voice and non-voice traffic on an end-to-end digital link. Indeed,

George Philip

1985-01-01

131

Scalable Optical-Fiber Communication Networks  

NASA Technical Reports Server (NTRS)

Scalable arbitrary fiber extension network (SAFEnet) is conceptual fiber-optic communication network passing digital signals among variety of computers and input/output devices at rates from 200 Mb/s to more than 100 Gb/s. Intended for use with very-high-speed computers and other data-processing and communication systems in which message-passing delays must be kept short. Inherent flexibility makes it possible to match performance of network to computers by optimizing configuration of interconnections. In addition, interconnections made redundant to provide tolerance to faults.

Chow, Edward T.; Peterson, John C.

1993-01-01

132

Information Theory Methods in Communication Complexity  

Microsoft Academic Search

We use tools and techniques from information theory to study communication complexityproblems in the one-way and simultaneous communication models. Our results include:(1) A tight characterization of multi-party one-way communication complexity for productdistributions in terms of VC-dimension and shatter coefficients;(2) An equivalence of multi-party one-way and simultaneous communication models for productdistributions;(3) A suite of lower bounds for specific functions in the...

Ziv Bar-yossef; T. S. Jayram; Ravi Kumar; D. Sivakumar

2002-01-01

133

ICT Information Communication Technology CollegeofCommunicationandInformation  

E-print Network

ICT Information Communication Technology CollegeofCommunicationandInformation KEY: # = new course * = course changed =coursedropped University of Kentucky 2013-2014 Undergraduate Bulletin 1 #ICT 200. (Same as IS 200.) #ICT 201 GENERAL INFORMATION SOURCES. (3

MacAdam, Keith

134

Designing Satellite Communication Networks by Zero-One Quadratic Programming  

E-print Network

In satellite communications networks, distinctive facilities called homing stations perform special transmission functions. Local demand nodes clustered around each homing station communicate with each other via a local ...

Helme, Marcia P.

135

Social Networking and Smart Technology: Viable Environmental Communication Tools?  

NASA Astrophysics Data System (ADS)

To what extent do popular social networking channels represent a viable means for disseminating information regarding environmental change to the general public? Are new forms of communication such as YouTube, Facebook, MySpace and Twitter and smart devices such as iPhone and BlackBerry useful and effective in terms motivating people into social action and behavioural modification; or do they simply pay lip service to these pressing environmental issues? This project will explore the background connections between social networking and environmental communication and education; and outline why such tools might be an appropriate way to connect to a broad audience in an efficient and unconventional manner. Further, research will survey the current prevalence of reliable environmental change information on social networking Internet-based media; and finally, suggestions for improved strategies and new directions will be provided.

Montain, J.; Byrne, J. M.

2010-12-01

136

Apparatus and method for data communication in an energy distribution network  

DOEpatents

A system for communicating information on an energy distribution network is disclosed. In one embodiment, the system includes a local supervisor on a communication network, wherein the local supervisor can collect data from one or more energy generation/monitoring devices. The system also includes a command center on the communication network, wherein the command center can generate one or more commands for controlling the one or more energy generation devices. The local supervisor can periodically transmit a data signal indicative of the data to the command center via a first channel of the communication network at a first interval. The local supervisor can also periodically transmit a request for a command to the command center via a second channel of the communication network at a second interval shorter than the first interval. This channel configuration provides effective data communication without a significant increase in the use of network resources.

Hussain, Mohsin; LaPorte, Brock; Uebel, Udo; Zia, Aftab

2014-07-08

137

Airborne information and reconnaissance network  

Microsoft Academic Search

We describe a broadband\\/tactical communication network architecture for implementing a rapidly deployable, broadband, mobile, wireless network using unmanned airborne relay vehicles for extended LOS range. The essential concept consists of a deployed group of unmanned airborne vehicles (UAV) providing wireless network service among mobile terrestrial and airborne stations. Each UAV is linked via wireless to one or more of its

Arun Ayyagari; J. P. Harrang; S. Ray

1996-01-01

138

The NASA Space Communications Data Networking Architecture  

NASA Technical Reports Server (NTRS)

The NASA Space Communications Architecture Working Group (SCAWG) has recently been developing an integrated agency-wide space communications architecture in order to provide the necessary communication and navigation capabilities to support NASA's new Exploration and Science Programs. A critical element of the space communications architecture is the end-to-end Data Networking Architecture, which must provide a wide range of services required for missions ranging from planetary rovers to human spaceflight, and from sub-orbital space to deep space. Requirements for a higher degree of user autonomy and interoperability between a variety of elements must be accommodated within an architecture that necessarily features minimum operational complexity. The architecture must also be scalable and evolvable to meet mission needs for the next 25 years. This paper will describe the recommended NASA Data Networking Architecture, present some of the rationale for the recommendations, and will illustrate an application of the architecture to example NASA missions.

Israel, David J.; Hooke, Adrian J.; Freeman, Kenneth; Rush, John J.

2006-01-01

139

WATERSHED INFORMATION NETWORK  

EPA Science Inventory

Resource Purpose: The Watershed Information Network is a set of about 30 web pages that are organized by topic. These pages access existing databases like the American Heritage Rivers Services database and Surf Your Watershed. WIN in itself has no data or data sets. L...

140

Weight-Control Information Network  

MedlinePLUS

... Facebook Welcome to WIN The Weight-control Information Network provides the general public, health professionals, the media, ... niddk.nih.gov ; or write Weight-control Information Network, 1 WIN Way, Bethesda, MD 208923665. Last ...

141

Based on asynchronous communication protocol of geographic space information service access mechanism research  

NASA Astrophysics Data System (ADS)

At present, the traditional way of accessing to classified network in geographic spatial information services is using network gatekeeper and firewall etc. to ensure public and classified network communications links. However, the physical isolation between classified network and public network is crossed, which is bound to cause classified network potential security hazard. In Yunnan province space Land dynamic monitoring integration project, it proposed the point to point text message communication protocol and asynchronous transmission mechanism. Using geo-spatial information encryption processing and data compression processing method, it reduced the risk of data sensitivity and monitored, namely to ensure data security, which realized geographic spatial information services data communication effectively between classified network and public network in the rigid field conditions.

Chen, G.; Zhao, J.; Gu, M.; Li, D.

2014-04-01

142

Timber Wolf Information Network  

NSDL National Science Digital Library

Wolves in the United States have suffered from human extermination efforts, habitat loss, and perhaps most significantly, a bad reputation. The Timber Wolf Information Network (TWIN) is working to reverse that reputation by increasing "public awareness and acceptance of the wolf in its natural habitat and its ecological role in the environment.¯¿½ The award-winning TWIN website contains links to numerous references; news stories that feature wolves; information about global conservation efforts; a section for kids; and population updates for wolves across the country. The site also contains organizational information about TWIN, and hosts the cleverly titled online forum: Scent Post.

143

The Cancer Information Network  

NSDL National Science Digital Library

The Cancer Information Network is a noncommercial website that was "founded to provide support and information to cancer patients and their caregivers." The site offers access to a plethora of resources that can help patients and others find current high-quality information on many types of cancer. Resource links are provided for many specific cancer subject areas including Breast Cancer, Colorectal Cancer, Esophageal Cancer, Lung Cancer, and many more. The site includes sections on News & Features, Support, and Prevention as well. The site also offers lists of relevant websites, support organizations, and a dictionary of cancer-related terms.

144

The Deep Space Network. [tracking and communication functions and facilities  

NASA Technical Reports Server (NTRS)

The objectives, functions, and organization of the Deep Space Network are summarized. The Deep Space Instrumentation Facility, the Ground Communications Facility, and the Network Control System are described.

1974-01-01

145

China Communications June 2006 99 Feature Articles: Next Generation Network  

E-print Network

China Communications June 2006 99 Feature Articles: Next Generation Network ABSTRACT There are two@ibr.cs.tu-bs.de ` #12;China Communications June 2006100 Feature Articles: Next Generation Network can benefit

Roedig, Utz

146

A Communications Network for Cislunar Operations  

NASA Technical Reports Server (NTRS)

Reliable and efficient communications will be critical to the success of commercial flight operations in cislunar space. The Internet is not well-suited to meeting this requirement. But the Delay-Tolerant Networking (DTN) architecture is. The DTN protocols are well-documented and implementations are mature. We think DTN will be ready to support low-cost, low-risk cislunar networking by the time the vehicles are in place.

Burleigh, Scott

2012-01-01

147

Understanding learning: Applications to Information and Communication Technology (ICT)  

E-print Network

Understanding learning: Applications to Information and Communication Technology (ICT to Information and Communication Technology (ICT) and to Environmental Governance & Learning Pathways ................................................................................................................................................... 3 PART I : UNDERSTANDING LEARNING: APPLICATIONS TO INFORMATION AND COMMUNICATION TECHNOLOGY (ICT

Paris-Sud XI, Université de

148

INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS AND NETWORKING Int. J. Satell. Commun. Network. 2006; 24:261281  

E-print Network

INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS AND NETWORKING Int. J. Satell. Commun. Network: 10.1002/sat.841 Turbo-coded APSK modulations design for satellite broadband communications Riccardo phase shift keying (APSK) modulation with application to satellite broadband communications. APSK

149

Evaluating video as a technology for informal communication  

Microsoft Academic Search

Collaborations in organizations thrive on communication that is informal because informal communication is frequent, interactive, and expressive. Informal communication is crucial for the coordination of work, learning an organization's culture, the perpetuation of the social relations that underlie collaboration, and, in general, any situation that requires communication to resolve ambiguity. Informal communication is traditionally mediated by physical proximity, but physical

Robert S. Fish; Robert E. Kraut; Robert W. Root; Ronald E. Rice

1992-01-01

150

Topology design and performance analysis of an integrated communication network  

NASA Technical Reports Server (NTRS)

A research study on the topology design and performance analysis for the Space Station Information System (SSIS) network is conducted. It is begun with a survey of existing research efforts in network topology design. Then a new approach for topology design is presented. It uses an efficient algorithm to generate candidate network designs (consisting of subsets of the set of all network components) in increasing order of their total costs, and checks each design to see if it forms an acceptable network. This technique gives the true cost-optimal network, and is particularly useful when the network has many constraints and not too many components. The algorithm for generating subsets is described in detail, and various aspects of the overall design procedure are discussed. Two more efficient versions of this algorithm (applicable in specific situations) are also given. Next, two important aspects of network performance analysis: network reliability and message delays are discussed. A new model is introduced to study the reliability of a network with dependent failures. For message delays, a collection of formulas from existing research results is given to compute or estimate the delays of messages in a communication network without making the independence assumption. The design algorithm coded in PASCAL is included as an appendix.

Li, V. O. K.; Lam, Y. F.; Hou, T. C.; Yuen, J. H.

1985-01-01

151

Experimental performance evaluation of software defined networking (SDN) based data communication networks for large scale flexi-grid optical networks.  

PubMed

Software defined networking (SDN) has become the focus in the current information and communication technology area because of its flexibility and programmability. It has been introduced into various network scenarios, such as datacenter networks, carrier networks, and wireless networks. Optical transport network is also regarded as an important application scenario for SDN, which is adopted as the enabling technology of data communication networks (DCN) instead of general multi-protocol label switching (GMPLS). However, the practical performance of SDN based DCN for large scale optical networks, which is very important for the technology selection in the future optical network deployment, has not been evaluated up to now. In this paper we have built a large scale flexi-grid optical network testbed with 1000 virtual optical transport nodes to evaluate the performance of SDN based DCN, including network scalability, DCN bandwidth limitation, and restoration time. A series of network performance parameters including blocking probability, bandwidth utilization, average lightpath provisioning time, and failure restoration time have been demonstrated under various network environments, such as with different traffic loads and different DCN bandwidths. The demonstration in this work can be taken as a proof for the future network deployment. PMID:24787842

Zhao, Yongli; He, Ruiying; Chen, Haoran; Zhang, Jie; Ji, Yuefeng; Zheng, Haomian; Lin, Yi; Wang, Xinbo

2014-04-21

152

Information Communication Technology (ICT) Shaping Student Affairs.  

ERIC Educational Resources Information Center

This paper opens with the following questions: "How prepared are you as a student affairs professional for information communication technology (ICT)? Do you understand such concepts as portals, e-business, Napster, computer use policies, and wireless communication? Will student affairs be shaped by ICT or will student affairs help shape ICT on

Broughton, Elizabeth

153

Extracting Controller Area Network data for reliable car communications  

Microsoft Academic Search

Networked electronic control units (ECUs) are increasingly being deployed in automobiles to realize various functions and controller area network (CAN) is deployed for the communications among ECUs. Our primary objective is to build both hardware and software that interface and communicate directly with CAN network and extract CAN messages for reliable car communications. The hardware is a circuit board that

Huaqun Guo; Jun Jie Ang; Yongdong Wu

2009-01-01

154

A study on industrial communication networking: Ethernet based implementation  

Microsoft Academic Search

Recent enhancement of the industrial communications and networking are possible to apply in Ethernet networks system at all levels of industrial automation, especially in the controller level whereby the data exchanges in real-time communication is mandatory. This paper is about a study on the development of industrial communications network based on the Ethernet protocol and thus implement it into computer

Hairulazwan Hashim; Zainal Alam Haron

2007-01-01

155

Graphene-enabled Wireless Communication Networks  

E-print Network

Graphene-enabled Wireless Communication Networks at the Nanoscale 1 Ignacio Llatser Nanonetworking;Graphene Honeycomb lattice of carbon atoms 2-dimensional material Discovered by A. K. Geim and K. S. Novoselov 9 Graphene G. Liu, W. Stillman, S. Rumyantsev, Q. Shao, M. Shur, A. A. Balandin, "Low

Politècnica de Catalunya, Universitat

156

Real-Time Communication in FDDI Networks  

Microsoft Academic Search

This paper provides a comprehensive study of the use of FDDI networks to support real-time communication in mission-critical systems. Due to the potentially catastrophic results of failure in such systems, it is important to avoid message loss whenever possible. We develop efficient tests to check whether message loss may occur, either due to missing deadlines or due to buffer overflow.

Nicholas Malcolm; Sanjay Kamat; Wei Zhao

1996-01-01

157

Swarm intelligence for routing in communication networks  

Microsoft Academic Search

Swarm intelligence, as demonstrated by natural biological swarms, exhibits numerous powerful features that are desirable in many engineering systems, such as communication networks. In addition, new paradigms for designing autonomous and scalable systems may result from analytically understanding and extending the design principles and operations inherent in intelligent biological swarms. A key element of future design paradigms will be emergent

I. Kassabalidis; M. A. El-Sharkawi; P. Arabshahi; A. A. Gray

2001-01-01

158

Supporting fault-tolerant communication in networks  

E-print Network

communication link between two nodes in a network. We present a capacity reservation algorithm in the case for upper bounds on edge capacities and costs associated with using per unit capacity on any edge. We give a flow based approximation algorithm with cost...

Kanjani, Khushboo

2009-05-15

159

Research priorities in networking and communications  

NASA Astrophysics Data System (ADS)

The NSF Division of Networking and Communications Research and Infrastructure was established in 1987, shortly after the creation of the CISE Directorate. In 1989, a workshop was convened to assess the overall program and to suggest directions for networking and communications research. A similar group reconvened in April 1992 to consider the research program in the light of the evolution of technology, to update the suggestions made by the previous workshop, to reconsider the assessment of research directions vis-a-vis research opportunities and national needs, and to evaluate the educational and research base in these areas in the U.S. This document is the report of the April 1992 workshop. The principal findings of the workshop participants are the fields of networking and communications are developing rapidly, and their importance is continually increasing; major new applications of both communications and networking have emerged in the past three years; significant research progress has occurred; important new research problems have sprung up; and funding levels are still well short of the needs of the field relative to its national importance.

1992-04-01

160

Information Horizons in Complex Networks  

Microsoft Academic Search

We investigate how the structure constrain specific communication in social-, man-made and biological networks. We find that human networks of governance and collaboration are predictable on teat-a-teat level, reflecting well defined pathways, but globally inefficient (1). In contrast, the Internet tends to have better overall communication abilities, more alternative pathways, and is therefore more robust. Between these extremes are the

Kim Sneppen

2005-01-01

161

Reliable Communication Across Ad Hoc Networks  

Microsoft Academic Search

AbstractThis paper,presents,a fully decentralised,peer-to- peer voice communication,tool intended,for use across mobile ad hoc,networks,(MANET) by distributed groups,who,desired collaboration. We examined,the synergy,between,MANETs and peer-to-peer virtual overlay networks,which,allowed the creation of ad hoc applications. One style of communication,considered suitable,for,task,oriented,distributed,group,collaboration was,push-to-talk. This research,was,focused,on,providing,a push-to-talk communication,platform,suitable for deployment across,MANETs. The,research,methodology,employed,was a proof,of concept,approach,within,a classical experimental computer,science paradigm.,We developed,a prototype,which used JXTA, a peer-to-peer virtual overlay

Francois N. Daniels; William D. Tucker

162

Information and Communication in Lean Product Development  

E-print Network

In this thesis, the implications and influences that information and communication impose on lean product development in general, as well as the development of a lean Product Development Value Stream Display (lean PDVSD) ...

Graebsch, Martin

163

Computationally Private Information Retrieval with Polylogarithmic Communication  

Microsoft Academic Search

We present a single-database computationally private information retrieval scheme with poly- logarithmic communication complexity. Our construction is based on a new, but reasonable intractability assumption, which we call the -Hiding Assumption (HA): essentially the di-

Christian Cachin; Silvio Micali; Markus Stadler

1999-01-01

164

Communicating health information to disadvantaged populations.  

PubMed

Interest in the communication of health information among disadvantaged populations has increased in recent years with the shift from a model of patient-provider communication to one of a more empowered healthcare consumer; with the use of new communication technologies that increase the number of channels through which health information may be accessed; and with the steadily increasing number of people without health insurance. Three separate research literatures contribute to our current understanding of this issue. In the medicine and public health literature, disparities in health access and outcomes among socioeconomic, ethnic, and racial groups are now well documented. In the information sciences literature, scholars note that on a continuum of health information behaviors, ranging from information avoidance and nonseeking to active seeking, nonseeking behaviors are associated with disadvantaged populations. In the communication literature, enthusiasm over the technology-driven growth of online health information seeking is tempered by evidence supporting the knowledge gap hypothesis, which indicates that as potential access to health information increases, systematic gaps in health knowledge also increase as groups with higher socioeconomic status acquire this information at a faster rate than those with lower socioeconomic status. A number of diverse strategies show promise in reducing information and health disparities, including those that focus on technology, such as programs to increase computer and Internet access, skills, and comprehension; those that focus on interpersonal communication, such as the community health worker model; and those that focus on mass media channels, such as entertainment education. PMID:20216358

Beacom, Amanda M; Newman, Sandra J

2010-01-01

165

Canadian Heritage Information Network  

NSDL National Science Digital Library

The Canadian Heritage Information Network, provided by the Department of Canadian Heritage, contains an abundance of information about the resources in Canadian museums and galleries. Through either the Guide to Canadian Museums and Galleries or the Official Directory of Canadian Museums and Related Institutions, users can find information about thousands of museums, galleries, and associated institutions. Information can be searched or browsed by name or location. CHIN also features eleven virtual exhibits at this time, ranging from Hauling Job Sturge's House to Endangered Species in Endangered Places to In the Countries of the Francophonie. A new exhibit, Gestures and Words, a project on Francophone artists in Canada, is forthcoming. The site is rounded out by Artefacts Canada, a searchable and browsable database on "millions of museum objects, natural history specimens and archaeological sites" contributed by Canadian museums and heritage organizations, and a set of miscellaneous professional resources.

166

Graph analysis of cortical networks reveals complex anatomical communication substrate  

NASA Astrophysics Data System (ADS)

Sensory information entering the nervous system follows independent paths of processing such that specific features are individually detected. However, sensory perception, awareness, and cognition emerge from the combination of information. Here we have analyzed the corticocortical network of the cat, looking for the anatomical substrate which permits the simultaneous segregation and integration of information in the brain. We find that cortical communications are mainly governed by three topological factors of the underlying network: (i) a large density of connections, (ii) segregation of cortical areas into clusters, and (iii) the presence of highly connected hubs aiding the multisensory processing and integration. Statistical analysis of the shortest paths reveals that, while information is highly accessible to all cortical areas, the complexity of cortical information processing may arise from the rich and intricate alternative paths in which areas can influence each other.

Zamora-Lpez, Gorka; Zhou, Changsong; Kurths, Jrgen

2009-03-01

167

Communication services for advanced network applications.  

SciTech Connect

Advanced network applications such as remote instrument control, collaborative environments, and remote I/O are distinguished by traditional applications such as videoconferencing by their need to create multiple, heterogeneous flows with different characteristics. For example, a single application may require remote I/O for raw datasets, shared controls for a collaborative analysis system, streaming video for image rendering data, and audio for collaboration. Furthermore, each flow can have different requirements in terms of reliability, network quality of service, security, etc. They argue that new approaches to communication services, protocols, and network architecture are required both to provide high-level abstractions for common flow types and to support user-level management of flow creation and quality. They describe experiences with the development of such applications and communication services.

Bresnahan, J.; Foster, I.; Insley, J.; Toonen, B.; Tuecke, S.

1999-06-10

168

Distributed communications resource management for tracking and surveillance networks  

NASA Astrophysics Data System (ADS)

We present a market-like method for distributed communications resource management in the context of networked tracking and surveillance systems. This method divides communication resources according to the expected utility provided by information of particular types. By formulating the problem as an optimization of the joint utility of information flow rates, the dual of the problem can be understood to provide a price for particular routes. Distributed rate control can be accomplished using primal-dual iteration in combination with communication of these route prices. We extend the previous work on the subject in a few important ways. First, we consider utility functions that are jointly-dependent on flow rates, to properly account for geometric synergy that can occur in sensor fusion problems. Second, we do not require that the rate-update algorithms have explicit knowledge of utility functions. Instead, our update algorithms involve transmitting marginal utility values. We present simulation results to demonstrate the effectiveness of the technique.

Chong, Edwin K. P.; Brewington, Brian

2005-09-01

169

A Broadband Power-Line Communication System Design Scheme for Typical Tanzanian Low-Voltage Network  

Microsoft Academic Search

Information and communications technologies (ICTs) are gaining importance in developing countries. Power-line network is a potential infrastructure for ICT services provision. Power-lines are highly interconnected network with stochastic variation in number of branches. Under such distributed network conditions the design of a broadband power-line communication (BPLC) system is a challenge. In this paper a case study of an actual power-line

Justinian Anatory; Nelson Theethayi; Rajeev Thottappillil; Nerey H. Mvungi

2009-01-01

170

Lewis Information Network (LINK): Background and overview  

NASA Technical Reports Server (NTRS)

The NASA Lewis Research Center supports many research facilities with many isolated buildings, including wind tunnels, test cells, and research laboratories. These facilities are all located on a 350 acre campus adjacent to the Cleveland Hopkins Airport. The function of NASA-Lewis is to do basic and applied research in all areas of aeronautics, fluid mechanics, materials and structures, space propulsion, and energy systems. These functions require a great variety of remote high speed, high volume data communications for computing and interactive graphic capabilities. In addition, new requirements for local distribution of intercenter video teleconferencing and data communications via satellite have developed. To address these and future communications requirements for the next 15 yrs, a project team was organized to design and implement a new high speed communication system that would handle both data and video information in a common lab-wide Local Area Network. The project team selected cable television broadband coaxial cable technology as the communications medium and first installation of in-ground cable began in the summer of 1980. The Lewis Information Network (LINK) became operational in August 1982 and has become the backbone of all data communications and video.

Schulte, Roger R.

1987-01-01

171

CollegeofCommunicationandInformation CJT Communication, Journalism, Telecommunications  

E-print Network

.Thiswillhelpstudentsgainadeepunderstandingofparticipatorycommunicationtheoryandresearch, and their implications for such contexts as management and organizational communication, health communicationCollegeofCommunicationandInformation CJT Communication, Journalism, Telecommunications (Graduate Bulletin 1 CJT 601 PROSEMINAR IN COMMUNICATION. (3) Introduction to graduate study; theory and systems

MacAdam, Keith

172

Directory: Information Resources for Human Communication Disorders.  

ERIC Educational Resources Information Center

This directory is designed to encourage networking among individuals and organizations that have an interest in deafness and communication disorders. The main body of the directory includes descriptions and publications of 122 organizations that are national in scope and that focus on health issues relating to hearing, balance, smell, taste,

National Inst. on Deafness and Other Communications Disorders, Bethesda, MD.

173

Networked sensor communications for the objective force  

NASA Astrophysics Data System (ADS)

The US Army's Future Combat Systems (FCS) and Objective Force will rely heavily on the use of unattended sensor networks to detect, locate and identify enemy targets in order to survive with less armor protection on the future battlefield. Successful implementation of these critical communication networks will require the collection of the sensor data, processing and collating it with available intelligence, then transporting it in a format conducive to make quick and accurate command decisions based on the latest tactical situational awareness. The networked communications must support both static deployed and mobile ground and air robotic sensors with secure, stealthy, and jam resistant links for sensor fusion and command and control. It is envisioned for broadest application that sensor networks can be deployed in a two-tiered architecture. The architecture includes a lower sensor sub- layer consisting of mixes of acoustic, magnetic and seismic detectors and an upper sub-layer consisting of infrared or visual imagers. The upper sub-layer can be cued by the lower sub-layer and provides a gateway link to the higher echelon tactical maneuver layer networks such as the Tactical Internet. The sensor deployments, networking constraints and reach back distances to Command and Control (C2) nodes will be mission scenario specific, however, the architecture will also apply to tactical unattended sensor, munition and robotic application. Technologies from the Army Research Laboratory, Defense Research Projects Agency (DARPA), and commercial will be leveraged for this effort.

Nemeroff, Jay L.; Garcia, Luis; Hampel, Daniel; DiPierro, Stefano

2002-08-01

174

Networked sensor communications for the objective force  

NASA Astrophysics Data System (ADS)

The US Army's Future Combat Systems (FCS) and Objective Force will rely heavily on the use of unattended sensor networks to detect, locate and identify enemy targets in order to survive with less armor protection on the future battlefield. Successful implementation of these critical communication networks will require the collection of the sensor data, processing and collating it with available intelligence, then transporting it in a format conducive to make quick and accurate command decisions based on the latest tactical situational awareness. The networked communications must support both static deployed and mobile ground and air robotic sensors with secure, stealthy, and jam resistant links for sensor fusion and command and control. It is envisioned for broadest application that sensor networks can be deployed in a two-tiered architecture. The architecture includes a lower sensor sub-layer consisting of mixes of acoustic, magnetic and seismic detectors and an upper sub-layer consisting of infrared or visual imagers. The upper sub-layer can be cued by the lower sub-layer and provides a gateway link to the higher echelon tactical maneuver layer networks such as the Tactical Internet. The sensor deployments, networking constraints and reach back distances to Command and Control (C2) nodes will be mission scenario specific, however, the architecture will also apply to tactical unattended sensor, munition and robotic applications. Technologies from the Army Research Laboratory, Defense Advance Research Projects Agency (DARPA), and commercial will be leveraged for this effort.

Nemeroff, Jay L.; Garcia, Luis; Hampel, Daniel; Di Pierro, Stefano

2002-08-01

175

Southwest Environmental Information Network  

NSDL National Science Digital Library

The Southwest Environmental Information Network (SEINet) is a series of linked databases and accompanying web software helpful in using those databases, which will be of interest to the environmental research community in Arizona, the Southwest, and elsewhere. SEINet allows users to locate, access, and work with a variety of data, including biological collections, ecological research data, GIS data, taxonomic information, bibliographies, and research protocols. Searchable databases include herbaria; pollen, fruit and seed collections; and mammal, bird, reptile, and amphibian collections. There is also a library of plant and lichen images; links to identification keys and species checklists from various research projects; information on NaviKey (a Java applet and application for accessing descriptive data); and Symbiota web tools (which integrate biological community knowledge and data in order to help identify plants).

176

IVSS-2005-APS-05 Secure Protocol For Inter-Vehicle Communication Networks  

E-print Network

drivers with updated information on traffic and road conditions for efficient and safe driving. The main on Inter-Vehicle Communication (IVC) networks. ITS technologies will reduce the risk of traffic accidents to exchange data among each other. IVC networks provide drivers with updated information on traffic and road

Mahmud, Syed Masud

177

Robustness of Consensus Algorithms for Networks with Communication Delays and Switching Topology  

NASA Astrophysics Data System (ADS)

In this paper, we study consensus problems of continuous-time multiagent systems. A multiagent system forms a communication network where each agent receives information from its neighbors. This information is used to obtain the control inputs necessary for achieving consensus. It is assumed that delays exist in communication networks. Communication delays are time dependent and differ for each communication channel. In addition, it is assumed that communication networks have switching topologies, and feedback gains are time varying. Under these assumptions, we show that a network system consisting of first-order agents is bounded and find a condition under which it achieves consensus. Stability is shown by using the Lyapunov theorem. In addition, we extend the consensus algorithm for first-order systems to an output consensus algorithm for high-order systems.

Shida, Takanobu; Ohmori, Hiromitsu

178

Structural Changes in Data Communication in Wireless Sensor Networks  

E-print Network

Wireless sensor networks are an important technology for making distributed autonomous measures in hostile or inaccessible environments. Among the challenges they pose, the way data travel among them is a relevant issue since their structure is quite dynamic. The operational topology of such devices can often be described by complex networks. In this work, we assess the variation of measures commonly employed in the complex networks literature applied to wireless sensor networks. Four data communication strategies were considered: geometric, random, small-world, and scale-free models, along with the shortest path length measure. The sensitivity of this measure was analyzed with respect to the following perturbations: insertion and removal of nodes in the geometric strategy; and insertion, removal and rewiring of links in the other models. The assessment was performed using the normalized Kullback-Leibler divergence and Hellinger distance quantifiers, both deriving from the Information Theory framework. The re...

Cabral, Raquel S; Frery, Alejandro C; Rosso, Osvaldo A; Ramrez, Jaime A

2013-01-01

179

Supporting informal communication via ephemeral interest groups  

Microsoft Academic Search

In this paper, we introduce ephemeral interest groups for supporting informal communication. Ephemeral interest groups are electronic discussion groups that, in contrast to bulletin boards and the like, are short-lived and ad hoc. They are designed as a medium for informal discussions of items broadcast to a wider community. We have implemented a prototype system to explore ephemeral interest groups.

Laurence Brothers; James D. Hollan; Jakob Nielsen; Scott Stornetta; Steven P. Abney; George W. Furnas; Michael L. Littman

1992-01-01

180

Health Care Information and Communications Technology  

Microsoft Academic Search

Delivery of health care in any country is complicated by a variety of circumstances owing to characteristic organisation of health care. Information is central to health care delivery, meaning information and communications technology (ICT) offer considerable promise. Yet there are several barriers to successful health care ICT deployment. This article outlines the promises and challenges facing both governments and health

Robin Gauld

2005-01-01

181

TEXconnect: An Open Communication & Information Infrastructure  

E-print Network

electronic business-to-business commerce along the textile supply chain by providing an open informationTEXconnect: An Open Communication & Information Infrastructure for the Textile Supply Chain P electronic commerce: the lack of interoperability and integration of applications. The project will improve

Baumann, Peter

182

Integrating Information & Communications Technologies into the Classroom  

ERIC Educational Resources Information Center

"Integrating Information & Communications Technologies Into the Classroom" examines topics critical to business, computer science, and information technology education, such as: school improvement and reform, standards-based technology education programs, data-driven decision making, and strategic technology education planning. This book also

Tomei, Lawrence, Ed.

2007-01-01

183

The Refugee Health Information Network  

Microsoft Academic Search

The Refugee Health Information Network is an electronic resource designed to make accessible culturally and linguistically appropriate health and medical information in order to improve health services for refugees and asylees. Much of this information will clearly be of value to immigrants as well. This is also a network designed to facilitate collaboration and sharing among state refugee health coordinators

Gale A. Dutcher; John C. Scott; Stacey J. Arnesen

2008-01-01

184

Position estimation of transceivers in communication networks  

DOEpatents

This invention provides a system and method using wireless communication interfaces coupled with statistical processing of time-of-flight data to locate by position estimation unknown wireless receivers. Such an invention can be applied in sensor network applications, such as environmental monitoring of water in the soil or chemicals in the air where the position of the network nodes is deemed critical. Moreover, the present invention can be arranged to operate in areas where a Global Positioning System (GPS) is not available, such as inside buildings, caves, and tunnels.

Kent, Claudia A. (Pleasanton, CA); Dowla, Farid (Castro Valley, CA)

2008-06-03

185

Research on optic antenna of space laser communication networking  

NASA Astrophysics Data System (ADS)

With the highlights of the high transmission rate, large capacity, strong anti-interference and anti-capture ability, good security and small light, space laser communication becomes an important hotspot. At present, the focus of research of the laser communication system is point to point communication structure. However, from the application point of view, both the realization of space laser communication among multiple points and the establishment of the information transmission network can really have the practical value. Aiming at the problem of space laser communication network, this article puts forward the general idea about optical antenna to achieve multiple tracking goals at the same time. Through the analysis of the optical antenna, and the comparing of the current commonly used mirror driving mechanism, a new mirror driving mechanism is designed. The azimuth motion, containing circular grating feedback, is driven by torque motor?voice coil motor of fan produces pitch motion that has fan-shaped grating feedback, so that compression of the structure size to improve the efficiency of the reflector assembly. Through the establishment of the driving mechanism and the kinematic model of 3D entity, the relationship between the single drive azimuth and pitch angle following the angle of incident light is explained. The biggest ideal view area affecting the optical antenna is obtained by the simulation analysis of the kinematics model using MATLAB. The several factors of field overlap area and blind area offers a theoretical basis for structure optimization and control system for the subsequent optical antenna design.

Meng, Li-Xin; Li, Long; Zhang, Li-zhong; Zhao, Shan-shan; Jiang, Hui-lin

2013-08-01

186

Analyzing the Dynamics of Communication in Online Social Networks  

NASA Astrophysics Data System (ADS)

This chapter deals with the analysis of interpersonal communication dynamics in online social networks and social media. Communication is central to the evolution of social systems. Today, the different online social sites feature variegated interactional affordances, ranging from blogging, micro-blogging, sharing media elements (i.e., image, video) as well as a rich set of social actions such as tagging, voting, commenting and so on. Consequently, these communication tools have begun to redefine the ways in which we exchange information or concepts, and how the media channels impact our online interactional behavior. Our central hypothesis is that such communication dynamics between individuals manifest themselves via two key aspects: the information or concept that is the content of communication, and the channel i.e., the media via which communication takes place. We present computational models and discuss large-scale quantitative observational studies for both these organizing ideas. First, we develop a computational framework to determine the "interestingness" property of conversations cented around rich media. Second, we present user models of diffusion of social actions and study the impact of homophily on the diffusion process. The outcome of this research is twofold. First, extensive empirical studies on datasets from YouTube have indicated that on rich media sites, the conversations that are deemed "interesting" appear to have consequential impact on the properties of the social network they are associated with: in terms of degree of participation of the individuals in future conversations, thematic diffusion as well as emergent cohesiveness in activity among the concerned participants in the network. Second, observational and computational studies on large social media datasets such as Twitter have indicated that diffusion of social actions in a network can be indicative of future information cascades. Besides, given a topic, these cascades are often a function of attribute homophily existent among the participants. We believe that this chapter can make significant contribution into a better understanding of how we communicate online and how it is redefining our collective sociological behavior.

de Choudhury, Munmun; Sundaram, Hari; John, Ajita; Seligmann, Doree Duncan

187

Real-Time Communication in Multihop Networks  

Microsoft Academic Search

Communication in real-time systems has to be predictable, because unpredictable delaysin the delivery of messages can adversely affect the execution of tasks dependent onthese messages. We develop a scheme for providing predictable interprocesscommunication in real-time systems with (partially connected) point-to-pointinterconnection networks, which provide guarantees on the maximum delivery time formessages. This scheme is based on the concept of a real-time

Dilip D. Kandlur; Kang G. Shin; Domenico Ferrari

1994-01-01

188

ANALYSIS OF HANDOVER CHARACTERISTICS IN SHADOWED LEO SATELLITE COMMUNICATION NETWORKS  

E-print Network

ANALYSIS OF HANDOVER CHARACTERISTICS IN SHADOWED LEO SATELLITE COMMUNICATION NETWORKS£ YOUNG HOON In the near future low earth orbit (LEO) satellite communication networks will partially substitute for fixed communication networks more than one satellite need to be simultaneously visible in order to hand over a call

Sung, Dan Keun

189

Personal Mobility in the ICEBERG Integrated Communication Network  

E-print Network

Personal Mobility in the ICEBERG Integrated Communication Network Bhaskaran Raman Randy H. Katz in the ICEBERG Integrated Communication Network Bhaskaran Raman Randy H. Katz Anthony D. Joseph fbhaskar communication services in a personalized, unified, and clean fashion across these devices. The Iceberg Project

Joseph, Anthony D.

190

Organizational Information System Adoption: A Network Perspective  

Microsoft Academic Search

As distributed organizations increasingly rely on technological innovations to enhance organizational efficiency and competitiveness,\\u000a interest in agile environments that enhance the diffusion and adoption of innovations has grown. Although Information Systems\\u000a has confirmed that social influence factors play an important role in the adoption of technological innovations by individuals,\\u000a less is understood about the mechanisms within social communication networks that

Dirk S. Hovorka; Kai R. Larsen

191

GAS MAIN SENSOR AND COMMUNICATIONS NETWORK SYSTEM  

SciTech Connect

Automatika, Inc. was contracted by the Department of Energy (DOE) and with co-funding from the New York Gas Group (NYGAS), to develop an in-pipe natural gas prototype measurement and wireless communications system for assessing and monitoring distribution networks. A prototype system was built for low-pressure cast-iron mains and tested in a spider- and serial-network configuration in a live network in Long Island with the support of Keyspan Energy, Inc. The prototype unit combined sensors capable of monitoring pressure, flow, humidity, temperature and vibration, which were sampled and combined in data-packages in an in-pipe master-slave architecture to collect data from a distributed spider-arrangement, and in a master-repeater-slave configuration in serial or ladder-network arrangements. It was found that the system was capable of performing all data-sampling and collection as expected, yielding interesting results as to flow-dynamics and vibration-detection. Wireless in-pipe communications were shown to be feasible and valuable data was collected in order to determine how to improve on range and data-quality in the future.

Hagen Schempf, Ph.D.

2003-02-27

192

Evolving Perspectives of Human Information Behavior: Contexts, Situations, Social Networks and Information Horizons  

Microsoft Academic Search

This paper presents an evolving framework of human information behavior. The framework emerges from theories and empirical studies from a variety of research traditions, including information science, communication, sociology and psychology, that inform our understanding of human information behavior. First, fundamental concepts, such as context, situation, and social networks, are discussed. Using these concepts, a series of propositions that strive

Diane H. Sonnenwald

193

Social Networks in Health Care: Communication, collaboration and insights  

E-print Network

-to-one media, 2007. #12;Issue Brief: Social Networks in Health Care: Communication, collaboration and insights 2 Business use of social networks Social networks transmit media such as video, web logs (blogs of Online Social Networks: A look at the change in demographics of social network users over time. The Pe

Klein, Ophir

194

(CICT) Computing, Information, and Communications Technology Overview  

NASA Technical Reports Server (NTRS)

The goal of the Computing, Information, and Communications Technology (CICT) program is to enable NASA's Scientific Research, Space Exploration, and Aerospace Technology Missions with greater mission assurance, for less cost, with increased science return through the development and use of advanced computing, information and communications technologies. This viewgraph presentation includes diagrams of how the political guidance behind CICT is structured. The presentation profiles each part of the NASA Mission in detail, and relates the Mission to the activities of CICT. CICT's Integrated Capability Goal is illustrated, and hypothetical missions which could be enabled by CICT are profiled. CICT technology development is profiled.

VanDalsem, William R.

2003-01-01

195

On attractant scheduling in networks based on bacterial communication  

E-print Network

On attractant scheduling in networks based on bacterial communication Yunlong Gao Shanghai Jiaotong on bacterial communication. Bacterial communication is a communication paradigm between biological cells which involves the physical motion of flagellated bacteria such as E. coli from the transmitter to the receiver

Sivakumar, Raghupathy

196

10 CFR 75.12 - Communication of information to IAEA.  

Code of Federal Regulations, 2010 CFR

...false Communication of information to IAEA. 75.12 Section 75.12 Energy...NUCLEAR MATERIAL-IMPLEMENTATION OF US/IAEA AGREEMENT Facility and Location Information...12 Communication of information to IAEA. (a) Except as otherwise...

2010-01-01

197

Global Legal Information Network  

NSDL National Science Digital Library

Legal scholars and those with an interest in the law will definitely want to take a look at the Global Legal Information Network (GLIN) website. Here visitors can search official full text legal documents, including judicial decisions, legislation, and laws. The database is provided courtesy of the Law Library of the United States Congress, and it draws from countries from around the world who wish to provide access to their own legal documents. Some of the countries who participate in the program include Brazil, Costa Rica, Kuwait, Peru, and Romania. Visitors will find that the ways to search the database are extremely helpful. Options include searching by jurisdiction, publication date, subject terms, and language. The site is rounded out by a section that provides answers to frequently asked questions about using the database.

2005-01-01

198

Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking  

E-print Network

Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume, and wireless communication capabilities. CARNIVORE's compact, low-power, mobile animal-borne nodes collect, and thus difficult to monitor directly or capture for repetitive physiological measures. To overcome

Wilmers, Chris

199

Acoustic Propagation Considerations for Underwater Acoustic Communications Network Development  

E-print Network

Acoustic Propagation Considerations for Underwater Acoustic Communications Network Development Woods Hole, MA 02543 jpreisig@whoi.edu ABSTRACT Underwater acoustic communications systems are challenged by the characteristics of acoustic propagation through the underwater environment

Zhou, Shengli

200

Personal Mobility in the ICEBERG Integrated Communication Network  

E-print Network

Personal Mobility in the ICEBERG Integrated Communication Network Bhaskaran Raman bhaskar communication services in a personalized, unified, and clean fashion across these devices. The Iceberg Project as defined by Iceberg are much richer than the corresponding concepts in traditional telephony

Raman, Bhaskaran

201

An Interdisciplinary Network Making Progress on Climate Change Communication  

NASA Astrophysics Data System (ADS)

Public understanding of climate change continues to lag far behind the scientific consensus not merely because the public lacks information, but because there is in fact too much complex and contradictory information available. Fortunately, we can now (1) build on careful empirical cognitive and social science research to understand what people already value, believe, and understand; and then (2) design and test strategies for translating complex science so that people can examine evidence, make well-informed inferences, and embrace science-based solutions. Informal science education institutions can help bridge the gap between climate scientists and the public. In the US, more than 1,500 informal science venues (science centers, museums, aquariums, zoos, nature centers, national parks, etc.) are visited annually by 61% of the population. Extensive research shows that these visitors are receptive to learning about climate change and trust these institutions as reliable sources. Ultimately, we need to take a strategic approach to the way climate change is communicated. An interdisciplinary approach is needed to bring together three key areas of expertise (as recommended by Pidgeon and Fischhoff, 2011): 1. Climate and decision science experts - who can summarize and explain what is known, characterize risks, and describe appropriate mitigation and adaptation strategies; 2. Social scientists - who can bring to bear research, theory, and best practices from cognitive, communication, knowledge acquisition, and social learning theory; and 3. Informal educators and program designers - who bring a practitioner perspective and can exponentially facilitate a learning process for additional interpreters. With support from an NSF CCEP Phase I grant, we have tested this approach, bringing together Interdisciplinary teams of colleagues for a five month "study circles" to develop skills to communicate climate change based on research in the social and cognitive sciences. In 2011, social scientists, Ph.D. students studying oceanography, and staff from more than 20 institutions that teach science to the public came together in these learning groups. Most participants were motivated to create new or revised training or public programs based on lessons learned together. The success of this program rests on a twofold approach that combines collaborative learning with a cognitive and social sciences research based approach to communications. The learning process facilitated trust and experimentation among co-learners to practice applications for communications that has continued beyond the study circle experience through the networks established during the process. Examples drawn from the study circle outputs suggest that this approach could have a transformative impact on informal science education on a broad scale. Ultimately, we envision informal science interpreters as "vectors" for effective science communication, ocean and climate scientists with enhanced communication skills, and increased public demand for explanation and dialogue about global issues.

Spitzer, W.; Anderson, J. C.; Bales, S.; Fraser, J.; Yoder, J. A.

2012-12-01

202

Essays on social networks and information worker productivity by Lynn Wu.  

E-print Network

In this thesis, I examine how information, information technology, and social networks affect information worker productivity. The work is divided into three essays based on tracking detailed communication patterns of ...

Wu, Lynn, 1981-

2011-01-01

203

Communication Efficiency and Congestion of Signal Traffic in Large-Scale Brain Networks  

PubMed Central

The complex connectivity of the cerebral cortex suggests that inter-regional communication is a primary function. Using computational modeling, we show that anatomical connectivity may be a major determinant for global information flow in brain networks. A macaque brain network was implemented as a communication network in which signal units flowed between grey matter nodes along white matter paths. Compared to degree-matched surrogate networks, information flow on the macaque brain network was characterized by higher loss rates, faster transit times and lower throughput, suggesting that neural connectivity may be optimized for speed rather than fidelity. Much of global communication was mediated by a rich club of hub regions: a sub-graph comprised of high-degree nodes that are more densely interconnected with each other than predicted by chance. First, macaque communication patterns most closely resembled those observed for a synthetic rich club network, but were less similar to those seen in a synthetic small world network, suggesting that the former is a more fundamental feature of brain network topology. Second, rich club regions attracted the most signal traffic and likewise, connections between rich club regions carried more traffic than connections between non-rich club regions. Third, a number of rich club regions were significantly under-congested, suggesting that macaque connectivity actively shapes information flow, funneling traffic towards some nodes and away from others. Together, our results indicate a critical role of the rich club of hub nodes in dynamic aspects of global brain communication. PMID:24415931

Mii?, Bratislav; Sporns, Olaf; McIntosh, Anthony R.

2014-01-01

204

Social networks and the communication of norms about prenatal care in rural Mexico.  

PubMed

Many normative beliefs are shared and learned through interpersonal communication, yet research on norms typically focuses on their effects rather than the communication that shapes them. This study focused on interpersonal communication during pregnancy to uncover (a) the nature of pregnancy-related communication and (b) normative information transmitted through such communication. Results from interviews with pregnant women living in rural Mexico revealed limited social networks; often, only a woman's mother or the baby's father were consulted about prenatal care decisions. However, women also indicated that communication with others during pregnancy provided important normative information regarding prenatal care. First, most referents believed that women should receive prenatal care (injunctive norm), which was conceptualized by participants as biomedical, nonmedical, or a blend of both. Second, family members often received prenatal care, whereas friends did not (descriptive norms). These findings highlight the key role of personal and social networks in shaping personal pregnancy-related beliefs and behaviors. PMID:25116348

Lapinski, Maria Knight; Anderson, Jenn; Cruz, Shannon; Lapine, Peter

2015-01-01

205

School Leadership and Information Communication Technology  

ERIC Educational Resources Information Center

Leadership is an important component in guiding the teaching-learning process. Principal as school leaders have a major responsibility for initiating and implementing school change through the use of Information and Communication Technology (ICT) and can facilitate complex decision to integrate it into learning, teaching and school administration.

Afshari, Mojgan; Bakar, Kamariah Abu; Luan, Wong Su; Samah, Bahaman Abu; Fooi, Foo Say

2008-01-01

206

Information and Communications Technologies Center Video Library  

NSDL National Science Digital Library

The Information and Communications Technologies Center (ICT) presents this collection of useful videos. Most of the clips are from conferences such as the 2010 CTC Winter Retreat and feature talks given at the conferences. Several other clips involve discussions of ICT academics and technology. The clips vary in length.

207

Understanding Science: Studies of Communication and Information.  

ERIC Educational Resources Information Center

Sets bibliometrics in the context of the sociology of science by tracing the influences of Robert Merton, Thomas Kuhn, and D. J. Price. Explores the discovery of strong empirical relationships among measured communication and information that capture important features of social process and cognitive change in science. (SR)

Griffith, Belver C.

1989-01-01

208

Communicating Geospatial Information through the Web  

E-print Network

Communicating Geospatial Information through the Web Implementations of GeoRSS and KML at UAH ­ Simple · Growing (built-in) support in visualization tools #12;KML · XML representation of geographic missions in Alaska and Canada #12;Real-Time Mission Monitor (KML) Flight Plans Flight Path Tracks Parameter

Christian, Eric

209

Turkish entrepreneurs in information and communication industry  

Microsoft Academic Search

Summary form only given. As entrepreneurship is an important tool for the development of future growth sectors, this paper attempts to analyze the dynamics of entrepreneurs in information and communication technology-based firms. Except for a few studies, the literature about new economy and entrepreneurship is focused on the analysis of advanced countries. In order to catch up with advanced countries,

D. Cetindamar

2001-01-01

210

Global Raptor Information Network  

NSDL National Science Digital Library

The Global Raptor Information Network includes newly compiled species accounts for 331 species of diurnal raptors (hawks, eagles, falcons, vultures). These are linked to homepages of raptor researchers from 66 countries, and the site also offers a searchable bibliographic database (with nearly 39,000 records) on birds of prey. Other features include a species database, which includes distributional information and conservation status for raptors in 260 countries and island groups, links to raptor organizations, hawkwatches, database resources, and homepages of over 200 ornithological journals. There is also a bulletin board with notices of upcoming raptor meetings, recent raptor news, and appeals for assistance. The site is maintained by The Peregrine Fund in Boise, Idaho in an effort to create a global community of raptor researchers and to make its research library, which contains one of the largest collections of ornithological references (now about 21,000 titles) in the world, accessible to researchers in any locality. A free PDF service is maintained to provide researchers in library-poor areas with access to the technical literature.

Fund, The P.

211

Estimated network database transaction volume to support wireless personal data communications applications  

Microsoft Academic Search

The real-time transaction volume throughput requirements of network databases to support likely, near-term data communication applications involving wireless end-user access to personal communications services (PCSs) are estimated. These applications consist of electronic mail and facsimile messaging, file transfers, personal information retrieval, and a general class of transaction-oriented data communications associated with field sales, service and delivery. Calculations are based on

C. N. Lo; R. S. Wolff

1993-01-01

212

Cooperative UAV-Based Communications Backbone for Sensor Networks  

SciTech Connect

The objective of this project is to investigate the use of unmanned air vehicles (UAVs) as mobile, adaptive communications backbones for ground-based sensor networks. In this type of network, the UAVs provide communication connectivity to sensors that cannot communicate with each other because of terrain, distance, or other geographical constraints. In these situations, UAVs provide a vertical communication path for the sensors, thereby mitigating geographic obstacles often imposed on networks. With the proper use of UAVs, connectivity to a widely disbursed sensor network in rugged terrain is readily achieved. Our investigation has focused on networks where multiple cooperating UAVs are used to form a network backbone. The advantage of using multiple UAVs to form the network backbone is parallelization of sensor connectivity. Many widely spaced or isolated sensors can be connected to the network at once using this approach. In these networks, the UAVs logically partition the sensor network into sub-networks (subnets), with one UAV assigned per subnet. Partitioning the network into subnets allows the UAVs to service sensors in parallel thereby decreasing the sensor-to-network connectivity. A UAV services sensors in its subnet by flying a route (path) through the subnet, uplinking data collected by the sensors, and forwarding the data to a ground station. An additional advantage of using multiple UAVs in the network is that they provide redundancy in the communications backbone, so that the failure of a single UAV does not necessarily imply the loss of the network.

Roberts, R S

2001-10-07

213

Architecting Communication Network of Networks for Space System of Systems  

NASA Technical Reports Server (NTRS)

The National Aeronautics and Space Administration (NASA) and the Department of Defense (DoD) are planning Space System of Systems (SoS) to address the new challenges of space exploration, defense, communications, navigation, Earth observation, and science. In addition, these complex systems must provide interoperability, enhanced reliability, common interfaces, dynamic operations, and autonomy in system management. Both NASA and the DoD have chosen to meet the new demands with high data rate communication systems and space Internet technologies that bring Internet Protocols (IP), routers, servers, software, and interfaces to space networks to enable as much autonomous operation of those networks as possible. These technologies reduce the cost of operations and, with higher bandwidths, support the expected voice, video, and data needed to coordinate activities at each stage of an exploration mission. In this paper, we discuss, in a generic fashion, how the architectural approaches and processes are being developed and used for defining a hypothetical communication and navigation networks infrastructure to support lunar exploration. Examples are given of the products generated by the architecture development process.

Bhasin, Kul B.; Hayden, Jeffrey L.

2008-01-01

214

Communication Network Patterns and Employee Performance with New Technology.  

ERIC Educational Resources Information Center

Investigates the relationship between employee performance, new technology, employee communication network variables (activity, size, diversity, and integrativeness), and productivity at two corporate offices. Reports significant positive relationships between three of the network variables and employee productivity with new technology. Discusses

Papa, Michael J.

1990-01-01

215

Communication Inequalities and Public Health Implications of Adult Social Networking Site Use in the United States  

Microsoft Academic Search

Social media, and specifically social networking sites (SNSs), are emerging as an important platform for communication and health information exchange. Yet, despite the increase in popularity and use, only a limited number of empirical studies document which segments of the adult population are and are not using social networking sites and with what, if any, affect on health. The purpose

Emily Z. Kontos; Karen M. Emmons; Elaine Puleo; K. Viswanath

2010-01-01

216

Communication protocols for underwater data collection using a robotic sensor network  

Microsoft Academic Search

We examine the problem of collecting data from an underwater sensor network using an autonomous underwater vehicle (AUV). The sensors in the network are equipped with acoustic modems that provide noisy, range-limited communication to the AUV. One challenge in this scenario is to plan paths that maximize the information collected and minimize travel time. While executing a path, the AUV

Geoffrey A. Hollinger; Sunav Choudhary; Parastoo Qarabaqi; Christopher Murphy; Urbashi Mitra; Gaurav S. Sukhatme; Milica Stojanovic; Hanumant Singh; Franz Hover

2011-01-01

217

IEEE Network November/December 200042 he success of long-haul fiber optic communication sys-  

E-print Network

IEEE Network · November/December 200042 he success of long-haul fiber optic communication sys- tems. Now that vast quantities of information can be sent over thousands of kilometers at low cost has shifted the focus of optical networking to the shorter-haul metropolitan and local-area domains

218

Effects of urban information and communication technology on sustainable development  

Microsoft Academic Search

This paper examines the urban information and communication technology and its impacts on sustainable development. The findings are based on the views represented in literature and the relationship between information and communication technology and sustainability in urban development. Therefore, information and communication technology as the main component of the information society should be taken into consideration in sustainable development. In

M. Navabakhsh; M. Motlaq

2009-01-01

219

Proactive and adaptive reconfiguration for reliable communication in tactical networks  

NASA Astrophysics Data System (ADS)

Due to the layer-independency design, in current wireless networks, only after a complete failure occurs in one of the involved layers, is the next higher layer notified, and by then performance degradation may already be observed. Also, the new connection establishment process has to go through all the layers. It is time-consuming and usually results in an extra latency and resource unavailability within the transition region, which in turn leads to inefficient bandwidth usage and a poor user experience. Moreover, the root-cause of the connection termination is typically hidden, and not utilized for the repair or reestablishment. To mitigate the problem, in this paper, we propose a proactive and adaptive cross-layer reconfiguration (PACR) scheme for reliable communication in tactical networks. The PACR scheme allows the user (e.g., network operator) to adaptively reconfigure operating parameters in the corresponding layers through proactive prediction, root-cause identification, and cross-layer negotiations. The core of the PACR scheme is an integrated crosslayer information sharing architecture that expedites information exchange and inter-layer interactions between different network layers in a proactive manner. Through simulation and experiments, it has been shown that our proposed PACR scheme can significantly improve the network performance, and facilitate the nodes or users to make smart decisions accordingly in an adaptive manner.

Zeng, Hui; Kwak, Kyung Joon; Deng, Julia; Fu, Bo; Xiao, Yang; Jeski, John

2012-05-01

220

Information and Communications Technologies (ICT) Center  

NSDL National Science Digital Library

The National Center for Information and Communications Technologies, an Advanced Technology Education (ATE) resource center, aims to "contribute to scientific and technological innovation in telecommunications education" as well as to "provide appropriately skilled technicians and technologists" to information and communication technologies (ICT) businesses, industry, and users. In the "Publications" section of this site, visitors will find links to ICT textbooks and a helpful glossary of telecommunications terms. In the "Resources" section, there are a number of ICT workforce development presentations and Flash simulations on topics such as shift keying and Ethernet switching. Also in this section, there is a web tutorial on designing accessible web pages. This site has a great deal of information to assist students and technologists in telecommunications fields, as well as ready-to-use instructional materials for educators.

2007-08-20

221

GAS MAIN SENSOR AND COMMUNICATIONS NETWORK SYSTEM  

SciTech Connect

Automatika, Inc. was contracted by the Department of Energy (DOE) and with co-funding from the New York Gas Group (NYGAS), to develop an in-pipe natural gas prototype measurement and wireless communications system for assessing and monitoring distribution networks. In Phase II of this three-phase program, an improved prototype system was built for low-pressure cast-iron and high-pressure steel (including a no-blow installation system) mains and tested in a serial-network configuration in a live network in Long Island with the support of Keyspan Energy, Inc. The experiment was carried out in several open-hole excavations over a multi-day period. The prototype units (3 total) combined sensors capable of monitoring pressure, flow, humidity, temperature and vibration, which were sampled and combined in data-packages in an in-pipe master-repeater-slave configuration in serial or ladder-network arrangements. It was verified that the system was capable of performing all data-sampling, data-storage and collection as expected, yielding interesting results as to flow-dynamics and vibration-detection. Wireless in-pipe communications were shown to be feasible and the system was demonstrated to run off in-ground battery- and above-ground solar power. The remote datalogger access and storage-card features were demonstrated and used to log and post-process system data. Real-time data-display on an updated Phase-I GUI was used for in-field demonstration and troubleshooting.

Hagen Schempf

2004-09-30

222

Chain-based communication in cylindrical underwater wireless sensor networks.  

PubMed

Appropriate network design is very significant for Underwater Wireless Sensor Networks (UWSNs). Application-oriented UWSNs are planned to achieve certain objectives. Therefore, there is always a demand for efficient data routing schemes, which can fulfill certain requirements of application-oriented UWSNs. These networks can be of any shape, i.e., rectangular, cylindrical or square. In this paper, we propose chain-based routing schemes for application-oriented cylindrical networks and also formulate mathematical models to find a global optimum path for data transmission. In the first scheme, we devise four interconnected chains of sensor nodes to perform data communication. In the second scheme, we propose routing scheme in which two chains of sensor nodes are interconnected, whereas in third scheme single-chain based routing is done in cylindrical networks. After finding local optimum paths in separate chains, we find global optimum paths through their interconnection. Moreover, we develop a computational model for the analysis of end-to-end delay. We compare the performance of the above three proposed schemes with that of Power Efficient Gathering System in Sensor Information Systems (PEGASIS) and Congestion adjusted PEGASIS (C-PEGASIS). Simulation results show that our proposed 4-chain based scheme performs better than the other selected schemes in terms of network lifetime, end-to-end delay, path loss, transmission loss, and packet sending rate. PMID:25658394

Javaid, Nadeem; Jafri, Mohsin Raza; Khan, Zahoor Ali; Alrajeh, Nabil; Imran, Muhammad; Vasilakos, Athanasios

2015-01-01

223

IEEE Communications Magazine August 2002102 A Survey on Sensor Networks  

E-print Network

IEEE Communications Magazine · August 2002102 A Survey on Sensor Networks 0163 the develop- ment of low-cost sensor networks. The sensor networks can be used for various application areas that researchers are currently resolving. The current state of the art of sensor networks is captured

McCalley, James D.

224

The network and transmission of based on the principle of laser multipoint communication  

NASA Astrophysics Data System (ADS)

Space laser communication is the perfectly choose to the earth integrated information backbone network in the future. This paper introduces the structure of the earth integrated information network that is a large capacity integrated high-speed broadband information network, a variety of communications platforms were densely interconnected together, such as the land, sea, air and deep air users or aircraft, the technologies of the intelligent high-speed processing, switching and routing were adopt. According to the principle of maximum effective comprehensive utilization of information resources, get accurately information, fast processing and efficient transmission through inter-satellite, satellite earth, sky and ground station and other links. Namely it will be a space-based, air-based and ground-based integrated information network. It will be started from the trends of laser communication. The current situation of laser multi-point communications were expounded, the transmission scheme of the dynamic multi-point between wireless laser communication n network has been carefully studied, a variety of laser communication network transmission schemes the corresponding characteristics and scope described in detail , described the optical multiplexer machine that based on the multiport form of communication is applied to relay backbone link; the optical multiplexer-based on the form of the segmentation receiver field of view is applied to small angle link, the optical multiplexer-based form of three concentric spheres structure is applied to short distances, motorized occasions, and the multi-point stitching structure based on the rotation paraboloid is applied to inter-satellite communications in detail. The multi-point laser communication terminal apparatus consist of the transmitting and receiving antenna, a relay optical system, the spectroscopic system, communication system and communication receiver transmitter system. The communication forms of optical multiplexer more than four goals or more, the ratio of received power and volume weight will be Obvious advantages, and can track multiple moving targets in flexible.It would to provide reference for the construction of earth integrated information networks.

Fu, Qiang; Liu, Xianzhu; Jiang, Huilin; Hu, Yuan; Jiang, Lun

2014-11-01

225

Models, Entropy and Information of Temporal Social Networks  

NASA Astrophysics Data System (ADS)

Temporal social networks are characterized by heterogeneous duration of contacts, which can either follow a power-law distribution, such as in face-to-face interactions, or a Weibull distribution, such as in mobile-phone communication. Here we model the dynamics of face-to-face interaction and mobile phone communication by a reinforcement dynamics, which explains the data observed in these different types of social interactions. We quantify the information encoded in the dynamics of these networks by the entropy of temporal networks. Finally, we show evidence that human dynamics is able to modulate the information present in social network dynamics when it follows circadian rhythms and when it is interfacing with a new technology such as the mobile-phone communication technology.

Zhao, Kun; Karsai, Mrton; Bianconi, Ginestra

226

Airborne Communication Networks for Small Unmanned Aircraft Systems  

Microsoft Academic Search

This paper explores the role of meshed airborne communication networks in the operational performance of small unmanned aircraft systems. Small unmanned aircraft systems have the potential to create new applications and markets in civil domains, enable many disruptive technologies, and put considerable stress on air traffic control systems. We argue that of the existing networked communication architectures, only meshed ad

Eric W. Frew; Timothy X. Brown

2008-01-01

227

Communication Performance over a Gigabit Ethernet Network. Paul A. Farrell  

E-print Network

Communication Performance over a Gigabit Ethernet Network. Paul A. Farrell Hong Ong Department@mcs.kent.edu Abstract Cluster computing imposes heavy demands on the com- munication network. Gigabit Ethernet of Gigabit Ethernet technology and study the end-to-end Gigabit Ethernet communication bandwidth and latency

Farrell, Paul A.

228

Communication Infrastructures for Distributed Control of Power Distribution Networks  

Microsoft Academic Search

Power distribution networks with distributed gener- ators (DGs) can exhibit complex operational regimes which makes conventional management approaches no longer adequate. This paper looks into key communication infrastructure design aspects, and analyzes two representative evolution cases of Active Network Management (ANM) for distributed control. Relevant standard initiatives, communication protocols and technologies are intro- duced and underlying engineering challenges are highlighted.

Qiang Yang; Javier A. Barria; Tim C. Green

2011-01-01

229

LOCOMOTION (TERRESTRIAL AND AERIAL) AND COMMUNICATION OF AUTONOMOUS ROBOT NETWORKS  

E-print Network

1 LOCOMOTION (TERRESTRIAL AND AERIAL) AND COMMUNICATION OF AUTONOMOUS ROBOT NETWORKS Arvin Agah This report focuses on locomotion and communication aspects of mobile robot networks for harsh polar environments. The report is organized into seven sections: terrestrial locomotion, aerial locomotion, micro air

Kansas, University of

230

Building a Unified Information Network.  

ERIC Educational Resources Information Center

Discusses cooperative efforts between research organizations and libraries to create a national information network. Topics discussed include the Linked System Project (LSP); technical processing versus reference and research functions; Open Systems Interconnection (OSI) Reference Model; the National Science Foundation Network (NSFNET); and

Avram, Henriette D.

1988-01-01

231

Gas Main Sensor and Communications Network System  

SciTech Connect

Automatika, Inc. was contracted by the Department of Energy (DOE) and with co-funding from the Northeast Gas Association (NGA), to develop an in-pipe natural gas prototype measurement and wireless communications system for assessing and monitoring distribution networks. This projected was completed in April 2006, and culminated in the installation of more than 2 dozen GasNet nodes in both low- and high-pressure cast-iron and steel mains owned by multiple utilities in the northeastern US. Utilities are currently logging data (off-line) and monitoring data in real time from single and multiple networked sensors over cellular networks and collecting data using wireless bluetooth PDA systems. The system was designed to be modular, using in-pipe sensor-wands capable of measuring, flow, pressure, temperature, water-content and vibration. Internal antennae allowed for the use of the pipe-internals as a waveguide for setting up a sensor network to collect data from multiple nodes simultaneously. Sensor nodes were designed to be installed with low- and no-blow techniques and tools. Using a multi-drop bus technique with a custom protocol, all electronics were designed to be buriable and allow for on-board data-collection (SD-card), wireless relaying and cellular network forwarding. Installation options afforded by the design included direct-burial and external polemounted variants. Power was provided by one or more batteries, direct AC-power (Class I Div.2) and solar-array. The utilities are currently in a data-collection phase and intend to use the collected (and processed) data to make capital improvement decisions, compare it to Stoner model predictions and evaluate the use of such a system for future expansion, technology-improvement and commercialization starting later in 2006.

Hagen Schempf

2006-05-31

232

77 FR 30529 - Information Collection Being Reviewed by the Federal Communications Commission Under Delegated...  

Federal Register 2010, 2011, 2012, 2013, 2014

...Federal Communications Commission...the Federal Communications Commission...following information collection...information technology; and ways...reduce the information burden for...Federal Communications...

2012-05-23

233

78 FR 8526 - Information Collection(s) Being Reviewed by the Federal Communications Commission, Comments...  

Federal Register 2010, 2011, 2012, 2013, 2014

...Federal Communications Commission...the Federal Communications Commission...following information collection...information technology; and ways...reduce the information burden for...Federal Communications...

2013-02-06

234

78 FR 6100 - Information Collection(s) Being Reviewed by the Federal Communications Commission, Comments...  

Federal Register 2010, 2011, 2012, 2013, 2014

...Federal Communications Commission...the Federal Communications Commission...following information collection...information technology; and ways...reduce the information burden for...Federal Communications...

2013-01-29

235

77 FR 42728 - Information Collection(s) Being Reviewed by the Federal Communications Commission, Comments...  

Federal Register 2010, 2011, 2012, 2013, 2014

...Federal Communications Commission...the Federal Communications Commission...following information collection...information technology; and ways...reduce the information burden for...Federal Communications...

2012-07-20

236

Supporting healthcare communication enabled by Information and Communication Technology: can HCI and related cognitive aspects help?  

Microsoft Academic Search

Communication in healthcare makes up an important part of the healthcare professionals' daily practices. Communication encompasses different forms of interaction and dissemination of health-related information, and takes place in contexts such as patient\\/healthcare professional relationships, and collaborative care. While Information and Communication Technology (ICT) offers a useful means to support the accessibility, the exchange and the sharing of information, the

Laurence Alpay; Pieter Toussaint; Bertie Zwetsloot-Schonk

2004-01-01

237

Distributed communications and control network for robotic mining  

NASA Technical Reports Server (NTRS)

The application of robotics to coal mining machines is one approach pursued to increase productivity while providing enhanced safety for the coal miner. Toward that end, a network composed of microcontrollers, computers, expert systems, real time operating systems, and a variety of program languages are being integrated that will act as the backbone for intelligent machine operation. Actual mining machines, including a few customized ones, have been given telerobotic semiautonomous capabilities by applying the described network. Control devices, intelligent sensors and computers onboard these machines are showing promise of achieving improved mining productivity and safety benefits. Current research using these machines involves navigation, multiple machine interaction, machine diagnostics, mineral detection, and graphical machine representation. Guidance sensors and systems employed include: sonar, laser rangers, gyroscopes, magnetometers, clinometers, and accelerometers. Information on the network of hardware/software and its implementation on mining machines are presented. Anticipated coal production operations using the network are discussed. A parallelism is also drawn between the direction of present day underground coal mining research to how the lunar soil (regolith) may be mined. A conceptual lunar mining operation that employs a distributed communication and control network is detailed.

Schiffbauer, William H.

1989-01-01

238

Statistically validated mobile communication networks: the evolution of motifs in European and Chinese data  

NASA Astrophysics Data System (ADS)

Big data open up unprecedented opportunities for investigating complex systems, including society. In particular, communication data serve as major sources for computational social sciences, but they have to be cleaned and filtered as they may contain spurious information due to recording errors as well as interactions, like commercial and marketing activities, not directly related to the social network. The network constructed from communication data can only be considered as a proxy for the network of social relationships. Here we apply a systematic method, based on multiple-hypothesis testing, to statistically validate the links and then construct the corresponding Bonferroni network, generalized to the directed case. We study two large datasets of mobile phone records, one from Europe and the other from China. For both datasets we compare the raw data networks with the corresponding Bonferroni networks and point out significant differences in the structures and in the basic network measures. We show evidence that the Bonferroni network provides a better proxy for the network of social interactions than the original one. Using the filtered networks, we investigated the statistics and temporal evolution of small directed 3-motifs and concluded that closed communication triads have a formation time scale, which is quite fast and typically intraday. We also find that open communication triads preferentially evolve into other open triads with a higher fraction of reciprocated calls. These stylized facts were observed for both datasets.

Li, Ming-Xia; Palchykov, Vasyl; Jiang, Zhi-Qiang; Kaski, Kimmo; Kertsz, Jnos; Miccich, Salvatore; Tumminello, Michele; Zhou, Wei-Xing; Mantegna, Rosario N.

2014-08-01

239

A Bit More to It: Scholarly Communication Forums as Socio-Technical Interaction Networks.  

ERIC Educational Resources Information Center

Examines the conceptual models that help to understand the development and sustainability of scholarly and professional communication forums on the Internet. An alternative information processing model that considers information technologies as Socio-Technical Interaction Networks (STINs) and a method for modeling electronic forums as STINs are

Kling, Rob; McKim, Geoffrey; King, Adam

2003-01-01

240

Short communication: Use of genomic and metabolic information as well as milk performance records for prediction of subclinical ketosis risk via artificial neural networks.  

PubMed

Subclinical ketosis is one of the most prevalent metabolic disorders in high-producing dairy cows during early lactation. This renders its early detection and prevention important for both economical and animal-welfare reasons. Construction of reliable predictive models is challenging, because traits like ketosis are commonly affected by multiple factors. In this context, machine learning methods offer great advantages because of their universal learning ability and flexibility in integrating various sorts of data. Here, an artificial-neural-network approach was applied to investigate the utility of metabolic, genetic, and milk performance data for the prediction of milk levels of ?-hydroxybutyrate within and across consecutive weeks postpartum. Data were collected from 218 dairy cows during their first 5wk in milk. All animals were genotyped with a 50,000 SNP panel, and weekly information on the concentrations of the milk metabolites glycerophosphocholine and phosphocholine as well as milk composition data (milk yield, fat and protein percentage) was available. The concentration of ?-hydroxybutyric acid in milk was used as target variable in all prediction models. Average correlations between observed and predicted target values up to 0.643 could be obtained, if milk metabolite and routine milk recording data were combined for prediction at the same day within weeks. Predictive performance of metabolic as well as milk performance-based models was higher than that of models based on genetic information. PMID:25465566

Ehret, A; Hochstuhl, D; Krattenmacher, N; Tetens, J; Klein, M S; Gronwald, W; Thaller, G

2015-01-01

241

The Integration of the Information and Communication Functions, and the Marketing of the Resulting Products.  

ERIC Educational Resources Information Center

Discusses the theoretical basis for integration of information functions and communication functions, the relevance of this integration in the scientific information cycle, and its positive effect on commodity research networks. The application of this theory is described using three commodity programs of the Centro Internacional de Agricultura

Harris, Susan C.

1985-01-01

242

Workplace Learning in Informal Networks  

ERIC Educational Resources Information Center

Learning does not stop when an individual leaves formal education, but becomes increasingly informal, and deeply embedded within other activities such as work. This article describes the challenges of informal learning in knowledge intensive industries, highlighting the important role of personal learning networks. The article argues that

Milligan, Colin; Littlejohn, Allison; Margaryan, Anoush

2014-01-01

243

Cryptanalysis and improvement of quantum secure communication network protocol with entangled photons for mobile communications  

NASA Astrophysics Data System (ADS)

Recently, a communication protocol called controlled bidirectional quantum secret direct communication for mobile networks was proposed by Chou et al (2014 Mobile Netw. Appl. 19 121). We study the security of the proposed communication protocol and find that it is not secure. The controller, Telecom Company, may eavesdrop secret messages from mobile devices without being detected. Finally, we give a possible improvement of the communication protocol.

Gao, Gan

2014-12-01

244

The Effect of Branch Network in Broadband Power Line Communication  

Microsoft Academic Search

In this paper, a multi-branch Indoor Power Line Network for Broadband Communication is modeled on the basis of ABCD matrix of two port network which leads to the formation of a transfer matrix, the element of which are used to find the transfer function of the multi-branch transmission line network consisting of taps up to 10 number. From the calculation

Kalyan Mondal; Pabitra Kumar Ray

2011-01-01

245

Communication-Efficient Implementation of Join in Sensor Networks  

E-print Network

1 Communication-Efficient Implementation of Join in Sensor Networks Himanshu Gupta and Vishal Chowdhary SUNY, Stony Brook. Email: hgupta,vishal@cs.sunysb.edu Abstract A sensor network is a multi-hop wireless network of sensor nodes cooperatively solving a sensing task. Each sensor node generates data

Gupta, Himanshu

246

A hybrid wireless network enhanced with multihopping for emergency communications  

Microsoft Academic Search

This paper proposes a hybrid wireless network scheme enhanced with ad hoc networking for disaster damage assessment and emergency communications. The network aims to maintain the connection between a base station (BS) and nodes by way of multihopping. In the event that a direct link between BS and a node is disconnected, the node switches modes from cellular to ad

Takahiro Fujiwara; Noboru Iida; Takashi Watanabe

2004-01-01

247

A novel impulse radio network for tactical military wireless communications  

Microsoft Academic Search

Two of the major concerns in tactical military wireless communication networks are covertness and throughput. Impulse radio is an ultra-wideband code division multiple access (UWB-CDMA) technique being considered as the physical layer for future networks. Impulse radio exhibits low power spectral density and relatively high immunity to fading but suffers from relatively long acquisition times. In traditional packet radio networks

Santosh S. Kolenchery; J. K. Townsend; J. A. Freebersyser

1998-01-01

248

Robust Networking Architecture and Secure Communication Scheme for Heterogeneous Wireless Sensor Networks  

ERIC Educational Resources Information Center

Current networking architectures and communication protocols used for Wireless Sensor Networks (WSNs) have been designed to be energy efficient, low latency, and long network lifetime. One major issue that must be addressed is the security in data communication. Due to the limited capabilities of low cost and small sized sensor nodes, designing

McNeal, McKenzie, III.

2012-01-01

249

Power-law behavior in complex organizational communication networks during crisis  

NASA Astrophysics Data System (ADS)

Communication networks can be described as patterns of contacts which are created due to the flow of messages and information shared among participating actors. Contemporary organizations are now commonly viewed as dynamic systems of adaptation and evolution containing several parts, which interact with one another both in internal and in external environment. Although there is limited consensus among researchers on the precise definition of organizational crisis, there is evidence of shared meaning: crisis produces individual crisis, crisis can be associated with positive or negative conditions, crises can be situations having been precipitated quickly or suddenly or situations that have developed over time and are predictable etc. In this research, we study the power-law behavior of an organizational email communication network during crisis from complexity perspective. Power law simply describes that, the probability that a randomly selected node has k links (i.e. degree k) follows P(k)?k, where ? is the degree exponent. We used social network analysis tools and techniques to analyze the email communication dataset. We tested two propositions: (1) as organization goes through crisis, a few actors, who are prominent or more active, will become central, and (2) the daily communication network as well as the actors in the communication network exhibit power-law behavior. Our preliminary results support these two propositions. The outcome of this study may provide significant advancement in exploring organizational communication network behavior during crisis.

Uddin, Shahadat; Murshed, Shahriar Tanvir Hasan; Hossain, Liaquat

2011-08-01

250

Consensus in networks of mobile communicating agents  

NASA Astrophysics Data System (ADS)

Populations of mobile and communicating agents describe a vast array of technological and natural systems, ranging from sensor networks to animal groups. Here, we investigate how a group-level agreement may emerge in the continuously evolving network defined by the local interactions of the moving individuals. We adopt a general scheme of motion in two dimensions and we let the individuals interact through the minimal naming game, a prototypical scheme to investigate social consensus. We distinguish different regimes of convergence determined by the emission range of the agents and by their mobility, and we identify the corresponding scaling behaviors of the consensus time. In the same way, we rationalize also the behavior of the maximum memory used during the convergence process, which determines the minimum cognitive/storage capacity needed by the individuals. Overall, we believe that the simple and general model presented in this paper can represent a helpful reference for a better understanding of the behavior of populations of mobile agents.

Baronchelli, Andrea; Daz-Guilera, Albert

2012-01-01

251

The emergence of information networks  

Microsoft Academic Search

The information industry has introduced a proliferation of alternative products all supposedly open and capable of interworking. The Automobile Association (AA) responded by developing an information technology strategy based initially on three technology platforms-ICL VME mainframe, UNIX server, and PC\\/MS DOS-with long-distance connection through X25. Among the issues discussed are the concept of an information network, systems architecture, user presentation,

C. V. Calder

1990-01-01

252

Information Theory as a Comparative Measure of Animal Communication  

Microsoft Academic Search

Information theoretic measurements of communication repertoires quantify the organizational complexity and potential communication capacity of signaling systems with unknown structure and function. The most important advantage of measuring signaling systems quantitatively is that it allows one to examine qualitatively different communication systems on a truly comparative scale. We will illustrate the utility of this information theoretic approach by outlining various

Sean Hanser; Brenda McCowan; Laurance Doyle

2000-01-01

253

Unreduced Dynamic Complexity: Towards the Unified Science of Intelligent Communication Networks and Software  

E-print Network

Operation of autonomic communication networks with complicated user-oriented functions should be described as unreduced many-body interaction process. The latter gives rise to complex-dynamic behaviour including fractally structured hierarchy of chaotically changing realisations. We recall the main results of the universal science of complexity (physics/9806002) based on the unreduced interaction problem solution and its application to various real systems, from nanobiosystems (physics/0412097, physics/0502133) and quantum devices (physics/0211071) to intelligent networks (physics/0412058) and emerging consciousness (physics/0409140). We concentrate then on applications to autonomic communication leading to fundamentally substantiated, exact science of intelligent communication and software. It aims at unification of the whole diversity of complex information system behaviour, similar to the conventional, "Newtonian" science order for sequential, regular models of system dynamics. Basic principles and first applications of the unified science of complex-dynamic communication networks and software are outlined to demonstrate its advantages and emerging practical perspectives.

Andrei P. Kirilyuk

2006-03-16

254

Green upgrading power grid communication network using deployment of DWDM  

Microsoft Academic Search

More information should be gathered to make the power grid unified, robust and smart. Power grid transport network needs higher capacity and reliability. There are numerous SDH\\/PDH equipments employed in the present network. The requirement of upgrading from SDH network to WDM network is investigated. The specific features of power grid transport network are also studied in this paper. A

Liming Zhou; Mi Lin; Jinnan Zhang; Yangan Zhang; Minglun Zhang; Yongqing Huang

2010-01-01

255

Advanced Communication and Networking Technologies for Mars Exploration  

NASA Technical Reports Server (NTRS)

Next-generation Mars communications networks will provide communications and navigation services to a wide variety of Mars science vehicles including: spacecraft that are arriving at Mars, spacecraft that are entering and descending in the Mars atmosphere, scientific orbiter spacecraft, spacecraft that return Mars samples to Earth, landers, rovers, aerobots, airplanes, and sensing pods. In the current architecture plans, the communication services will be provided using capabilities deployed on the science vehicles as well as dedicated communication satellites that will together make up the Mars network. This network will evolve as additional vehicles arrive, depart or end their useful missions. Cost savings and increased reliability will result from the ability to share communication services between missions. This paper discusses the basic architecture that is needed to support the Mars Communications Network part of NASA's Space Science Enterprise (SSE) communications architecture. The network may use various networking technologies such as those employed in the terrestrial Internet, as well as special purpose deep-space protocols to move data and commands autonomously between vehicles, at disparate Mars vicinity sites (on the surface or in near-Mars space) and between Mars vehicles and earthbound users. The architecture of the spacecraft on-board local communications is being reconsidered in light of these new networking requirements. The trend towards increasingly autonomous operation of the spacecraft is aimed at reducing the dependence on resource scheduling provided by Earth-based operators and increasing system fault tolerance. However, these benefits will result in increased communication and software development requirements. As a result, the envisioned Mars communications infrastructure requires both hardware and protocol technology advancements. This paper will describe a number of the critical technology needs and some of the ongoing research activities.

Bhasin, Kul; Hayden, Jeff; Agre, Jonathan R.; Clare, Loren P.; Yan, Tsun-Yee

2001-01-01

256

Emerging information technology and the expanding role of technical communicators  

E-print Network

Emerging information technology is expanding the role of technical communicators. Functionality present in software tools contributes to a re-definition of what tasks technical communicators currently perform and how they will use object management...

McGuire, Richard Charles

2012-06-07

257

Ethics of Clear Health Communication: applying the CLean Look approach to Communicate Biobanking Information for Cancer research  

PubMed Central

Cancer innovations, such as biobanking technologies, are continuously evolving to improve our understanding and knowledge about cancer prevention and treatment modalities. However, the public receives little communication about biobanking and is often unaware about this innovation until asked to donate biospecimens. It is the researchers ethical duty to provide clear communications about biobanking and biospecimen research. Such information allows the public to understand biobanking processes and facilitates informed decision making about biospecimen donation. The aims of this paper are 1) to examine the importance of clear communication as an ethical imperative when conveying information about cancer innovations and 2) to illustrate the use of an organizing framework, the CLEAN (Culture, Literacy, Education, Assessment, and Networking) Look approach for creating educational priming materials about the topic of biobanking. PMID:23124500

Koskan, Alexis; Arevalo, Mariana; Gwede, Clement K.; Quinn, Gwendolyn P.; Noel-Thomas, Shalewa A.; Luque, John S.; Wells, Kristen J.; Meade, Cathy D.

2013-01-01

258

150 College of Communications and Information Studies 2007-2008 University of Kentucky Bulletin College of Communications and Information Studies  

E-print Network

and organizational communication, and com- munication theory and research. Graduates pursue a variety of career paths150 College of Communications and Information Studies 2007-2008 University of Kentucky Bulletin College of Communications and Information Studies J. David Johnson, Ph.D., is Dean of the College

MacAdam, Keith

259

[Information and communication technologies in nursing].  

PubMed

The application of information and communication technologies (ICT) in nursing is an integral part of the educational curriculum at the university graduate level of nursing, but also part of scientific and professional meetings on nursing informatics. As part of seminars, students are obliged to choose e-health topics from their working environment, to show them and discuss with colleagues. The same is happening at meeting on nursing informatics. Selected papers on the issue are chosen to cover information literacy of nurses, examples of e-nursing, ICT infrastructure, the possible future developments and organizational aspects of e-health at healthcare institutions. Among others, special attention is paid to improving the quality of work in nursing. PMID:24979889

Kern, Josipa

2014-03-01

260

Next generation information communication infrastructure and case studies for future power systems  

NASA Astrophysics Data System (ADS)

As power industry enters the new century, powerful driving forces, uncertainties and new functions are compelling electric utilities to make dramatic changes in their information communication infrastructure. Expanding network services such as real time measurement and monitoring are also driving the need for more bandwidth in the communication network. These needs will grow further as new remote real-time protection and control applications become more feasible and pervasive. This dissertation addresses two main issues for the future power system information infrastructure: communication network infrastructure and associated power system applications. Optical networks no doubt will become the predominant data transmission media for next generation power system communication. The rapid development of fiber optic network technology poses new challenges in the areas of topology design, network management and real time applications. Based on advanced fiber optic technologies, an all-fiber network is investigated and proposed. The study will cover the system architecture and data exchange protocol aspects. High bandwidth, robust optical networks could provide great opportunities to the power system for better service and efficient operation. In the dissertation, different applications are investigated. One of the typical applications is the SCADA information accessing system. An Internet-based application for the substation automation system will be presented. VLSI (Very Large Scale Integration) technology is also used for one-line diagrams auto-generation. High transition rate and low latency optical network is especially suitable for power system real time control. In the dissertation, a new local area network based Load Shedding Controller (LSC) for isolated power system will be presented. By using PMU (Phasor Measurement Unit) and fiber optic network, an AGE (Area Generation Error) based accurate wide area load shedding scheme will also be proposed. The objective is to shed the load in the limited area with minimum disturbance.

Qiu, Bin

261

10 CFR 73.54 - Protection of digital computer and communication systems and networks.  

Code of Federal Regulations, 2014 CFR

...2014-01-01 false Protection of digital computer and communication systems and networks...Sites 73.54 Protection of digital computer and communication systems and networks...shall provide high assurance that digital computer and communication systems and...

2014-01-01

262

10 CFR 73.54 - Protection of digital computer and communication systems and networks.  

Code of Federal Regulations, 2013 CFR

...2013-01-01 false Protection of digital computer and communication systems and networks...Sites 73.54 Protection of digital computer and communication systems and networks...shall provide high assurance that digital computer and communication systems and...

2013-01-01

263

10 CFR 73.54 - Protection of digital computer and communication systems and networks.  

Code of Federal Regulations, 2010 CFR

...2010-01-01 false Protection of digital computer and communication systems and networks...73.54 Protection of digital computer and communication systems and networks...provide high assurance that digital computer and communication systems and...

2010-01-01

264

On the capacity of information networks  

Microsoft Academic Search

Abstract We consider information networks in the absence of interference and noise, and present an upper bound on the rate at which information can be transmitted using network coding. Our upper bound is based on combining properties of entropy with a strong information inequality derived from,the structure of the network. The undirected k-pairs conjecture states that the information capacity of

Micah Adler; Nicholas J. A. Harvey; Kamal Jain; Robert D. Kleinberg; April Rasala Lehman

2006-01-01

265

Cooperative Congestion Control in Power Grid Communication Networks  

E-print Network

, Illinois 61801 Email: klara@illinois.edu Abstract--Power grid digital communication networks are needed and C are the power grid sensing stations (e.g., substations). Each utility contains PMU sensors

Nahrstedt, Klara

266

Ranking Information in Networks  

NASA Astrophysics Data System (ADS)

Given a network, we are interested in ranking sets of nodes that score highest on user-specified criteria. For instance in graphs from bibliographic data (e.g. PubMed), we would like to discover sets of authors with expertise in a wide range of disciplines. We present this ranking task as a Top-K problem; utilize fixed-memory heuristic search; and present performance of both the serial and distributed search algorithms on synthetic and real-world data sets.

Eliassi-Rad, Tina; Henderson, Keith

267

Information Recovery In Behavioral Networks  

E-print Network

In the context of agent based modeling and network theory, we focus on the problem of recovering micro behavior-related choice information from aggregate origin-destination data. As a basis for predicting agents' choices we emphasize the connection between adaptive intelligent behavior, causal entropy maximization and self-organized, equilibrium-seeking behavior in a dynamic system. We cast this problem in the form of a binary network and suggest information theoretic, entropy-driven methods to recover estimates of the unknown parameters connecting the behavioral data. Our objective is to recover the unknown behavioral binary parameters analytically, without explicitly sampling the configuration space. In order to do so, we enlarge the set of estimators commonly employed to make optimal use of the available information. More specifically, we consider the Cressie-Read family of entropic functionals and focus on three cases of particular interest. We then apply this information theoretic method to the analysis ...

Squartini, Tiziano; Garlaschelli, Diego; Judge, George

2015-01-01

268

Discrete Optimization Models for Cooperative Communication in Ad Hoc Networks  

Microsoft Academic Search

Ad hoc networks have recently been used as a communications medium on tasks that require high levels of communication and\\u000a coordination. We study the problem of determining an optimal route for a group of wireless units, such that the total connection\\u000a time among nodes in the resulting mobile ad hoc network is maximized, subject to a limit on the traveled

Carlos A. S. Oliveira

2006-01-01

269

Transparent self-healing communication networks via diversity coding  

Microsoft Academic Search

The authors present an error control based approach, called diversity coding, to provide nearly instantaneous self-healing digital communication networks. This is achieved by constructing an error-correcting code across logically independent channels and by treating link failures within the framework of an erasure channel model. Diversity coding is more efficient than the existing approaches to self-healing communication networks since it is

Chih-Lin I; Ender Ayanoglu; R. D. Gitlin; J. E. Mazo

1990-01-01

270

Project Universe - Local area networks and satellite communications  

Microsoft Academic Search

A high-speed digital communications system is discussed in which a satellite is used to link a number of local area networks which interconnect a variety of computer facilities. The advantages of satellite communications compared with terrestrial links are described, together with a historical survey of the use of the Orbital Test Satellite (OTS) for data experiments. A description of Project

B. R. Ackroyd

1983-01-01

271

Path Selection for Real-Time Communication in Wormhole Networks  

Microsoft Academic Search

For real-time communication, we must be able to guarantee timely delivery of messages. In a previous paper, Kim et al. presented a real-time communication method for networks which uses a deterministic wormhole routing algorithm. It would be more desirable to be able to use an adaptive wormhole routing algo- rithm. However, the use of an adaptive algorithm results in highly

Kyungwan Nam; Sunggu Lee; Jong Kim

1999-01-01

272

Davis Social Links: Leveraging Social Networks for Future Internet Communication  

E-print Network

to revoke access to itself (or its identity) if it is being abused. An email address, which al- lows anyDavis Social Links: Leveraging Social Networks for Future Internet Communication Lerone Banks communication ar- chitecture for future Internet designs. We begin with a con- ceptual discussion of how future

California at Davis, University of

273

Coalitional Game Theory for Communication Networks: A Tutorial  

Microsoft Academic Search

Game theoretical techniques have recently become prevalent in many engineering applications, notably in communica- tions. With the emergence of cooperation as a new communication paradigm, and the need for self-organizing, decentralized, and autonomic networks, it has become imperative to seek suitable game theoretical tools that allow to analyze and study the behavior and interactions of the nodes in future communication

Walid Saad; Zhu Han; Mrouane Debbah; Are Hjrungnes; Tamer Basar

2009-01-01

274

Standard Ethernet as an Embedded Communication Network Project Report  

E-print Network

the performance of the most popular LAN, IEEE 802.3 Ethernet, when used for embedded communication. We compare that because Ethernet operates at a higher bit rate than slow-speed embedded protocols, and is most effi- cientStandard Ethernet as an Embedded Communication Network Project Report For the Degree Of Master

Koopman, Philip

275

Mechatronics and communications technology: an approach based on networks integration  

Microsoft Academic Search

Shop floor communications networks are evolving towards the increased use of open connecting equipment, that meets standard protocols, under a client-server architecture. An implementation of a such communications server, based in a low cost PC with multiport and field bus cards, is presented. The first prototype has been designed as a black box transparent to flexible manufacturing plants, connecting to

P. Marino; F. Poza; J. B. Nogueira

1997-01-01

276

Fostering Information and Communication Technology Literacy: Insights from Telecommunications Services  

ERIC Educational Resources Information Center

The author argues that the rapid growth of information and communication technologies and an increasingly complex global environment have brought about the need for information and communication technology (ICT) literacy, the ability to use information technology effectively and evaluate its role in society critically. She presents a strategy for

Winter, Jenifer S.

2007-01-01

277

Design of Hybrid Mobile Communication Networks for Planetary Exploration  

NASA Technical Reports Server (NTRS)

The Mobile Exploration System Project (MEX) at NASA Ames Research Center has been conducting studies into hybrid communication networks for future planetary missions. These networks consist of space-based communication assets connected to ground-based Internets and planetary surface-based mobile wireless networks. These hybrid mobile networks have been deployed in rugged field locations in the American desert and the Canadian arctic for support of science and simulation activities on at least six occasions. This work has been conducted over the past five years resulting in evolving architectural complexity, improved component characteristics and better analysis and test methods. A rich set of data and techniques have resulted from the development and field testing of the communication network during field expeditions such as the Haughton Mars Project and NASA Mobile Agents Project.

Alena, Richard L.; Ossenfort, John; Lee, Charles; Walker, Edward; Stone, Thom

2004-01-01

278

Network analysis of team communication in a busy emergency department  

PubMed Central

Background The Emergency Department (ED) is consistently described as a high-risk environment for patients and clinicians that demands colleagues quickly work together as a cohesive group. Communication between nurses, physicians, and other ED clinicians is complex and difficult to track. A clear understanding of communications in the ED is lacking, which has a potentially negative impact on the design and effectiveness of interventions to improve communications. We sought to use Social Network Analysis (SNA) to characterize communication between clinicians in the ED. Methods Over three-months, we surveyed to solicit the communication relationships between clinicians at one urban academic ED across all shifts. We abstracted survey responses into matrices, calculated three standard SNA measures (network density, network centralization, and in-degree centrality), and presented findings stratified by night/day shift and over time. Results We received surveys from 82% of eligible participants and identified wide variation in the magnitude of communication cohesion (density) and concentration of communication between clinicians (centralization) by day/night shift and over time. We also identified variation in in-degree centrality (a measure of power/influence) by day/night shift and over time. Conclusions We show that SNA measurement techniques provide a comprehensive view of ED communication patterns. Our use of SNA revealed that frequency of communication as a measure of interdependencies between ED clinicians varies by day/night shift and over time. PMID:23521890

2013-01-01

279

Technology Developments Integrating a Space Network Communications Testbed  

NASA Technical Reports Server (NTRS)

As future manned and robotic space explorations missions involve more complex systems, it is essential to verify, validate, and optimize such systems through simulation and emulation in a low cost testbed environment. The goal of such a testbed is to perform detailed testing of advanced space and ground communications networks, technologies, and client applications that are essential for future space exploration missions. We describe the development of new technologies enhancing our Multi-mission Advanced Communications Hybrid Environment for Test and Evaluation (MACHETE) that enable its integration in a distributed space communications testbed. MACHETE combines orbital modeling, link analysis, and protocol and service modeling to quantify system performance based on comprehensive considerations of different aspects of space missions. It can simulate entire networks and can interface with external (testbed) systems. The key technology developments enabling the integration of MACHETE into a distributed testbed are the Monitor and Control module and the QualNet IP Network Emulator module. Specifically, the Monitor and Control module establishes a standard interface mechanism to centralize the management of each testbed component. The QualNet IP Network Emulator module allows externally generated network traffic to be passed through MACHETE to experience simulated network behaviors such as propagation delay, data loss, orbital effects and other communications characteristics, including entire network behaviors. We report a successful integration of MACHETE with a space communication testbed modeling a lunar exploration scenario. This document is the viewgraph slides of the presentation.

Kwong, Winston; Jennings, Esther; Clare, Loren; Leang, Dee

2006-01-01

280

Whether information network supplements friendship network  

NASA Astrophysics Data System (ADS)

Homophily is a significant mechanism for link prediction in complex network, of which principle describes that people with similar profiles or experiences tend to tie with each other. In a multi-relationship network, friendship among people has been utilized to reinforce similarity of taste for recommendation system whose basic idea is similar to homophily, yet how the taste inversely affects friendship prediction is little discussed. This paper contributes to address the issue by analyzing two benchmark data sets both including user's behavioral information of taste and friendship based on the principle of homophily. It can be found that the creation of friendship tightly associates with personal taste. Especially, the behavioral information of taste involving with popular objects is much more effective to improve the performance of friendship prediction. However, this result seems to be contradictory to the finding in Zhang etal. (2013) that the behavior information of taste involving with popular objects is redundant in recommendation system. We thus discuss this inconformity to comprehensively understand the correlation between them.

Miao, Lili; Zhang, Qian-Ming; Nie, Da-Cheng; Cai, Shi-Min

2015-02-01

281

Space division multiple access (SDMA) for robust ad hoc vehicle communication networks  

Microsoft Academic Search

Proposes a robust, self-organizing architecture for mobile ad hoc networks. The network architecture, space division multiple access (SDMA), relies on user location information and provides users access to the communication channel based on their location. SDMA divides the geographical space, where users are located, into smaller spaces. The key element of the design is a one-to-one map between the space

Soheila V. Bana; Pravin Varaiya

2001-01-01

282

Information Security and Privacy in Network Environments.  

ERIC Educational Resources Information Center

The use of information networks for business and government is expanding enormously. Government use of networks features prominently in plans to make government more efficient, effective, and responsive. But the transformation brought about by the networking also raises new concerns for the security and privacy of networked information. This

Congress of the U.S., Washington, DC. Office of Technology Assessment.

283

Mining heterogeneous information networks: the next frontier  

Microsoft Academic Search

Real world physical and abstract data objects are interconnected, forming gigantic, interconnected networks. By structuring these data objects into multiple types, such networks become semi-structured heterogeneous information networks. Most real world applications that handle big data, including interconnected social media and social networks, scientific, engineering, or medical information systems, online e-commerce systems, and most database systems, can be structured into

Jaiwei Han

2012-01-01

284

Family Health History Communication Networks of Older Adults: Importance of Social Relationships and Disease Perceptions  

ERIC Educational Resources Information Center

Older individuals play a critical role in disseminating family health history (FHH) information that can facilitate disease prevention among younger family members. This study evaluated the characteristics of older adults and their familial networks associated with two types of communication ("have shared" and "intend to share

Ashida, Sato; Kaphingst, Kimberly A.; Goodman, Melody; Schafer, Ellen J.

2013-01-01

285

Enhancements for integrated wireless personal communications over metropolitan area networks  

Microsoft Academic Search

The IEEE 802.6 metropolitan area network (MAN) has been proposed previously to provide for the distributed control of networks providing personal communications services (PCS). This paper continues investigations into voice transport on the MAN using pre-arbitrated (PA) bandwidth, and for signaling and data transport using queue arbitrated (QA) bandwidth. A new scheme for the transport of PCS voice is proposed.

Christopher M. Cobbold; Robert W. Donaldson

1996-01-01

286

Structure and tie strengths in mobile communication networks  

E-print Network

Structure and tie strengths in mobile communication networks J.-P. Onnela* , J. Sarama¨ki*, J. Hyvo consequence that social networks are robust to the removal of the strong ties but fall apart after a phase transition if the weak ties are removed. We show that this coupling significantly slows the diffusion process

Iamnitchi, Adriana

287

Synchronization for wireless multi-radar covert communication networks  

Microsoft Academic Search

The motivation for our current work is the need for a covert wireless communication network between multi-site radars. Such radars form an effective network-centric architecture that has intrinsic properties such as LPI, LPD, and good data dissemination capabilities. Our continuing work indicates that a notched UWB noise signal within which OFDM data symbols are embedded can be used as a

Shrawan C. Surender; Ram M. Narayanan

2007-01-01

288

Communications network design and costing model programmers manual  

NASA Technical Reports Server (NTRS)

Otpimization algorithms and techniques used in the communications network design and costing model for least cost route and least cost network problems are examined from the programmer's point of view. All system program modules, the data structures within the model, and the files which make up the data base are described.

Logan, K. P.; Somes, S. S.; Clark, C. A.

1983-01-01

289

Enabling Disconnected Transitive Communication in Mobile Ad Hoc Networks  

Microsoft Academic Search

Recently, mobile ad hoc computing has attracted much at- tentionintheresearchcommunity. Difierentfrommostcur- rentwirelessnetworks,mobilead-hocnetworkshavenoflxed infrastructure, all hosts are capable of movement, and the network is continuously reconstructed into multiple discon- nected clusters. In such environments, connection is unsta- ble, and communication is unpredictable. Current research mainly focuses on providing the same models of communi- cation in this environment as in flxed networks,

Xiangchuan Chen; Amy L. Murphy

2001-01-01

290

Short Communication Performance enhancement of Willshaw type networks through  

E-print Network

2387 Short Communication Performance enhancement of Willshaw type networks through the use of limit contains. A general algorithm for simulating neural networks with sparsely coded patterns is also discussed of ones is much smaller than the num- ber of zeros or minus ones, has been of interest to the neural

Paris-Sud XI, Université de

291

Novel Quantum Virtual Private Network Scheme for PON via Quantum Secure Direct Communication  

NASA Astrophysics Data System (ADS)

Two quantum secure direct communication (QSDC) protocols with quantum identification (QI) based on passive optical network (PON) architecture are proposed. One QSDC protocol can be implemented between two different optical network units just with simple configurations of PON by optical line terminal when they are in the same virtual private network after optical line terminal performing QI to the optical network units in the given PON architecture. The other QSDC protocol is also implemented between any two legitimated users in the virtual private network but with considerable reduction of workload of the optical line terminal. The security analysis shows that the proposed QSDC schemes with quantum identification are unconditionally secure and allow the legitimate users to exchange their secret information efficiently and to realize a quantum virtual private network in the PON networks ultimately.

Gong, Li-Hua; Liu, Ye; Zhou, Nan-Run

2013-09-01

292

75 FR 63473 - Notice of Public Information Collection(s) Being Reviewed by the Federal Communications...  

Federal Register 2010, 2011, 2012, 2013, 2014

...communications in the Nation's communications networks and critical...disruptions reporting from all communications providers (cable, satellite, wireline and wireless...voice and/or paging communications. As envisioned,...

2010-10-15

293

Design of a communication system for integration of industrial networks over public IP networks  

Microsoft Academic Search

The opportunity to integrate industrial automation applications from different cells over IP networks is a great advantage of such high level design over legacy proprietary data acquisition systems. The CyberOPC communication system is a research project in order to support and enhance all communications processes for manufacturing cells over Internet. That communication system was developed initially as variant of the

Nunzio Torrisi; Dennis Brando; Rodrigo P. Pantoni; Joo F. G. Oliveira

2007-01-01

294

Novel technology for enhanced security and trust in communication networks  

NASA Astrophysics Data System (ADS)

A novel technology that significantly enhances security and trust in wireless and wired communication networks has been developed. It is based on integration of a novel encryption mechanism and novel data packet structure with enhanced security tools. This novel data packet structure results in an unprecedented level of security and trust, while at the same time reducing power consumption and computing/communication overhead in networks. As a result, networks are provided with protection against intrusion, exploitation, and cyber attacks and posses self-building, self-awareness, self-configuring, self-healing, and self-protecting intelligence.

Milovanov, Alexander; Bukshpun, Leonid; Pradhan, Ranjit; Jannson, Tomasz

2011-06-01

295

Health care network communications infrastructure: an engineering design for the Military Health Service System.  

PubMed Central

The Military Health Service System (MHSS) provides health care for the Department of Defense (DOD). This system operates on an annual budget of $15 Billion, supports 127 medical treatment facilities (MTFs) and 500 clinics, and provides support to 8.7 million beneficiaries worldwide. To support these facilities and their patients, the MHSS uses more than 125 different networked automated medical systems. These systems rely on a heterogeneous telecommunications infrastructure for data communications. With the support of the Defense Medical Information Management (DMIM) Program Office, our goal was to identify the network requirements for DMIM migration and target systems and design a communications infrastructure to support all systems with an integrated network. This work used tools from Business Process Reengineering (BPR) and applied it to communications infrastructure design for the first time. The methodology and results are applicable to any health care enterprise, military or civilian. PMID:8563346

Hoffman, P.; Kline, E.; George, L.; Price, K.; Clark, M.; Walasin, R.

1995-01-01

296

Junior / Community College Students with Learning Disabilities and Their Use of Information and Communication Technologies (ICTs)  

ERIC Educational Resources Information Center

Junior / community college students who have learning disabilities (LD), such as dyslexia, often do not maximize their use of information and communication technologies (ICTs) for school work. They do not use many of these technologies nor do they know as much about them as other students. These are the results of an Adaptech Research Network

Nguyen, Mai Nhu; Fichten, Catherine; King, Laura; Barile, Maria; Mimouni, Zohra; Havel, Alice; Raymond, Odette; Juhel, Jean-Charles; Jorgensen, Shirley; Chauvin, Alexandre; Gutberg, Jennifer; Budd, Jillian; Hewlett, Maureen; Heiman, Tali; Gaulin, Chris; Asuncion, Jennison

2013-01-01

297

Information Communication Technology in Public Health: The Role of Systems Modelling  

Microsoft Academic Search

The National Health Service is being re-engineered. One of the components is that public health medicine needs to be delivered differently but effectively. It has been proposed that this should be done via managed public health networks (MPHNs). Underpinning this re-engineering there is an increasing role for ICT (information and communication technologies) and previous work suggests that most of the

D. K. Fahey; E. R. Carson; D. G. Cramp; J. A. Muir Gray

2003-01-01

298

The Implications of Information and Communications Technologies for Distance Education: Looking toward the Future. Final Report  

ERIC Educational Resources Information Center

One salient factor of increasing interest in distance education is advancement in information and communications technologies (ICTs). In particular, digital and networked technologies have had a wide range of effects on the educational materials, practices, and institutions involved in education, notably by improving time-and cost-efficient

Arafeh, Sousan

2004-01-01

299

Needs for Developing Culturally Oriented Supportive Learning with the Aid of Information and Communication Technologies  

ERIC Educational Resources Information Center

This article demonstrates the inadequacy of access and use of Information and Communication Technologies (ICTs) and networked learning for many people in non-Western societies and for those who belong to ethno-cultural minority groups. Especially, immigrants have great needs in the domain of learning the language of the host country as a foreign

Palaiologou, Nektaria

2009-01-01

300

Risk management communication system between a local government and residents using several network systems and terminal devices  

NASA Astrophysics Data System (ADS)

Most of Japan's local governments utilize municipal disaster-management radio communications systems to communicate information on disasters or terrorism to residents. The national government is progressing in efforts toward digitalization by local governments of these systems, but only a small number (approx. 10%) have introduced such equipment due to its requiring large amounts of investment. On the other hand, many local governments are moving forward in installation of optical fiber networks for the purpose of eliminating the "digital divide." We herein propose a communication system as an alternative or supplement to municipal disaster-management radio communications systems, which utilizes municipal optical fiber networks, the internet and similar networks and terminals. The system utilizes the multiple existing networks and is capable of instantly distributing to all residents, and controlling, risk management information. We describe the system overview and the field trials conducted with a local government using this system.

Ohyama, Takashi; Enomoto, Hiroyuki; Takei, Yuichiro; Maeda, Yuji

2009-05-01

301

Health information networks: enabling care management in IDSs.  

PubMed

To be successful, IDSs require streamlined, information integration across the continuum of care. Having this capability enables IDSs to manage care and costs efficiently, provide physicians with enterprisewide access to eligibility information, and respond to the communication and quality demands of patients. For most IDSs, the quickest and most cost-effective way to achieve overall information-system integration is to implement a health information network (HIN) based on Internet technologies. A HIN enables IDS providers and staff to access requisite administrative and clinical information from throughout the enterprise using a Web browser. PMID:10847912

McNamara, T M

2000-03-01

302

Adaptive protocols for information dissemination in wireless sensor networks  

Microsoft Academic Search

In this paper, we present a family of adaptive protocols, called SPIN (Sensor Protocols for Information via Negotia- tion), that efficiently disseminates information among sen- sors in an energy-constrained wireless sensor network. Nodes running a SPIN communication protocol name their data us- ing high-level data descriptors, called meta-data. They use meta-data negotiations to eliminate the transmission of re- dundant data

Wendi Rabiner Heinzelman; Joanna Kulik; Hari Balakrishnan

1999-01-01

303

PREFACE: Quantum Information, Communication, Computation and Cryptography  

NASA Astrophysics Data System (ADS)

The application of quantum mechanics to information related fields such as communication, computation and cryptography is a fast growing line of research that has been witnessing an outburst of theoretical and experimental results, with possible practical applications. On the one hand, quantum cryptography with its impact on secrecy of transmission is having its first important actual implementations; on the other hand, the recent advances in quantum optics, ion trapping, BEC manipulation, spin and quantum dot technologies allow us to put to direct test a great deal of theoretical ideas and results. These achievements have stimulated a reborn interest in various aspects of quantum mechanics, creating a unique interplay between physics, both theoretical and experimental, mathematics, information theory and computer science. In view of all these developments, it appeared timely to organize a meeting where graduate students and young researchers could be exposed to the fundamentals of the theory, while senior experts could exchange their latest results. The activity was structured as a school followed by a workshop, and took place at The Abdus Salam International Center for Theoretical Physics (ICTP) and The International School for Advanced Studies (SISSA) in Trieste, Italy, from 12-23 June 2006. The meeting was part of the activity of the Joint European Master Curriculum Development Programme in Quantum Information, Communication, Cryptography and Computation, involving the Universities of Cergy-Pontoise (France), Chania (Greece), Leuven (Belgium), Rennes1 (France) and Trieste (Italy). This special issue of Journal of Physics A: Mathematical and Theoretical collects 22 contributions from well known experts who took part in the workshop. They summarize the present day status of the research in the manifold aspects of quantum information. The issue is opened by two review articles, the first by G Adesso and F Illuminati discussing entanglement in continuous variable systems, the second by T Prosen, discussing chaos and complexity in quantum systems. Both topics have theoretical as well as experimental relevance and are likely to witness a fast growing development in the near future. The remaining contributions present more specific and very recent results. They involve the study of the structure of quantum states and their estimation (B Baumgartner et al, C King et al, S Olivares et al, D Petz et al and W van Dam et al), of entanglement generation and its quantification (G Brida et al, F Ciccarello et al, G Costantini et al, O Romero-Isart et al, D Rossini et al, A Serafini et al and D Vitali et al), of randomness related effects on entanglement behaviour (I Akhalwaya et al, O Dahlsten et al and L Viola et al), and of abstract and applied aspects of quantum computation and communication (K Audenart, G M D'Ariano et al, N Datta et al, L C Kwek et al and M Nathanson et al). We would like to express our gratitude to the European Commission, the Abdus Salam ICTP, SISSA and Eurotech SpA (Amaro, Udine, Italy) for financial and/or logistic support. Special thanks also go to the workshop secretary Marina De Comelli, and the secretaries of the Department of Theoretical Physics, University of Trieste, Sabrina Gaspardis and Rosita Glavina for their precious help and assistance.

Benatti, F.; Fannes, M.; Floreanini, R.; Petritis, D.

2007-07-01

304

Enhanced Communication Network Solution for Positive Train Control Implementation  

NASA Technical Reports Server (NTRS)

The commuter and freight railroad industry is required to implement Positive Train Control (PTC) by 2015 (2012 for Metrolink), a challenging network communications problem. This paper will discuss present technologies developed by the National Aeronautics and Space Administration (NASA) to overcome comparable communication challenges encountered in deep space mission operations. PTC will be based on a new cellular wireless packet Internet Protocol (IP) network. However, ensuring reliability in such a network is difficult due to the "dead zones" and transient disruptions we commonly experience when we lose calls in commercial cellular networks. These disruptions make it difficult to meet PTC s stringent reliability (99.999%) and safety requirements, deployment deadlines, and budget. This paper proposes innovative solutions based on space-proven technologies that would help meet these challenges: (1) Delay Tolerant Networking (DTN) technology, designed for use in resource-constrained, embedded systems and currently in use on the International Space Station, enables reliable communication over networks in which timely data acknowledgments might not be possible due to transient link outages. (2) Policy-Based Management (PBM) provides dynamic management capabilities, allowing vital data to be exchanged selectively (with priority) by utilizing alternative communication resources. The resulting network may help railroads implement PTC faster, cheaper, and more reliably.

Fatehi, M. T.; Simon, J.; Chang, W.; Chow, E. T.; Burleigh, S. C.

2011-01-01

305

77 FR 4816 - Information Collection Being Reviewed by the Federal Communications Commission  

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2012-01-31

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78 FR 70045 - Information Collection Being Reviewed by the Federal Communications Commission  

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2013-11-22

307

Interference alignment for wireless communication networks.  

E-print Network

??Interference has been a fundamental performance bottleneck in wireless communication. Conventional interference control schemes, which are mainly based on channel orthogonalization, are non-capacity achieving in (more)

Ruan, Liangzhong

2013-01-01

308

Computing, Information, and Communications Technology (CICT) Program Overview  

NASA Technical Reports Server (NTRS)

The Computing, Information and Communications Technology (CICT) Program's goal is to enable NASA's Scientific Research, Space Exploration, and Aerospace Technology Missions with greater mission assurance, for less cost, with increased science return through the development and use of advanced computing, information and communication technologies

VanDalsem, William R.

2003-01-01

309

Fading channels: information-theoretic and communications aspects  

Microsoft Academic Search

In this paper we review the most peculiar and interesting information-theoretic and communications features of fading channels. We first describe the statistical models of fading channels which are frequently used in the analysis and design of communication systems. Next, we focus on the information theory of fading channels, by emphasizing capacity as the most important performance measure. Both single-user and

Ezio Biglieri; John Proakis; Shlomo Shamai

1998-01-01

310

Fading Channels: Information-Theoretic and Communication Aspects  

Microsoft Academic Search

In this paper we review the most peculiar and interesting information-theoretic and communications features of fading channels. We first describe the statistical models of fading channels which are frequently used in the analysis and design of communication systems. Next, we focus on the information theory of fading channels, by emphasizing capacity as the most important performance measure. Both single-user and

Ezio Biglieri; John G. Proakis; Shlomo Shamai

1998-01-01

311

Information and Communications Technologies Center (ICT) YouTube Channel  

NSDL National Science Digital Library

This page presents the YouTube channel of the National Center for Information and Communications Technologies (ICT Center). There is a growing collection of videos - focusing on information and communication technologies - on topics such as Second Life, the oscilloscope, digital media production, games and gaming, as well as a number of interviews with others in the telecommunications technology field.

2008-09-08

312

Enforcing Security Policies in Large Scale Communication Networks  

Microsoft Academic Search

Due to unexpected network interconnection growth, the security of technological and information infrastructures is becoming difficult to be managed and controlled. In addition, security is becoming more and more crucial for an organisation's information systems operation. The management of an organisation has to establish rules and regulations in order to face the threats that its information systems face. The network

Theodore K. Apostolopoulos; Victoria C. Daskalou; Sokratis K. Katsikas; K. D. Moulinos

1998-01-01

313

Local, regional and large scale integrated networks: Volume 1. Large networks for defense communications: Strategies, performance measures and cost trends  

Microsoft Academic Search

Investigations into local, regional, and large scale packet switched network cost and performance for Defense Department communications are summarized. The issues examined include: (1) alternative large network architectures; (2) performance evaluation criteria; (3) formulation of the large network design problem; (4) defense communication requirements; (5) local access network tradeoffs; (6) backbone and total network performance and cost characteristics; and (7)

H. Frank; I. Gitman; R. Vanslyke

1976-01-01

314

Modern Aspects of Communication in Education of Teachers Using New Information and Communication Technologies (ICT)  

ERIC Educational Resources Information Center

This work deals with the need of introducing modern aspects of communication on higher education of future teachers using information and communication technologies. The emphasis is put on the importance for future teachers to have basic information science knowledge and skills and their preparations for using ICT. A growth of the number of

Tatkovic, Nevenka; Sehanovic, Jusuf; Ruzic, Maja

2005-01-01

315

Performance-aware Security of Unicast Communication in Hybrid Satellite Networks  

E-print Network

Performance-aware Security of Unicast Communication in Hybrid Satellite Networks Ayan Roy for securing the end-to-end communication in hybrid satellite networks. Satellite networks use TCP and HTTP communication in hybrid satellite networks. We therefore propose the use of the Layered IPSEC (LES) protocol

Baras, John S.

316

The deep space network, volume 18. [Deep Space Instrumentation Facility, Ground Communication Facility, and Network Control System  

NASA Technical Reports Server (NTRS)

The objectives, functions, and organization of the Deep Space Network are summarized. The Deep Space Instrumentation Facility, the Ground Communications Facility, and the Network Control System are described.

1973-01-01

317

Space-based Networking Technology Developments in the Interplanetary Network Directorate Information Technology Program  

NASA Technical Reports Server (NTRS)

Described recent development of communications protocols, services, and associated tools targeted to reduce risk, reduce cost and increase efficiency of IND infrastructure and supported mission operations. Space-based networking technologies developed were: a) Provide differentiated quality of service (QoS) that will give precedence to traffic that users have selected as having the greatest importance and/or time-criticality; b) Improve the total value of information to users through the use of QoS prioritization techniques; c) Increase operational flexibility and improve command-response turnaround; d) Enable new class of networked and collaborative science missions; e) Simplify applications interfaces to communications services; and f) Reduce risk and cost from a common object model and automated scheduling and communications protocols. Technologies are described in three general areas: communications scheduling, middleware, and protocols. Additionally developed simulation environment, which provides comprehensive, quantitative understanding of the technologies performance within overall, evolving architecture, as well as ability to refine & optimize specific components.

Clare, Loren; Clement, B.; Gao, J.; Hutcherson, J.; Jennings, E.

2006-01-01

318

Time Allocation in Social Networks: Correlation Between Social Structure and Human Communication Dynamics  

NASA Astrophysics Data System (ADS)

Recent research has shown the deep impact of the dynamics of human interactions (or temporal social networks) on the spreading of information, opinion formation, etc. In general, the bursty nature of human interactions lowers the interaction between people to the extent that both the speed and reach of information diffusion are diminished. Using a large database of 20 million users of mobile phone calls we show evidence this effect is not homogeneous in the social network but in fact, there is a large correlation between this effect and the social topological structure around a given individual. In particular, we show that social relations of hubs in a network are relatively weaker from the dynamical point than those that are poorer connected in the information diffusion process. Our results show the importance of the temporal patterns of communication when analyzing and modeling dynamical process on social networks.

Miritello, Giovanna; Lara, Rubn; Moro, Esteban

319

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2010-03-11

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2010-11-12

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2011-12-22

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2011-03-22

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2013-12-30

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2010-04-19

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2011-01-21

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2013-12-30

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2013-01-29

349

Information and communication in polygon theories  

E-print Network

Generalized probabilistic theories (GPT) provide a framework in which one can formulate physical theories that includes classical and quantum theories, but also many other alternative theories. In order to compare different GPTs, we advocate an approach in which one views a state in a GPT as a resource, and quantifies the cost of interconverting between different such resources. We illustrate this approach on polygon theories (Janotta et al. New J. Phys 13, 063024, 2011) that interpolate (as the number n of edges of the polygon increases) between a classical trit (when n=3) and a real quantum bit (when n=infinity). Our main results are that simulating the transmission of a single n-gon state requires more than one qubit, or more than log(log(n)) bits, and that n-gon states with n odd cannot be simulated by n'-gon states with n' even (for all n,n'). These results are obtained by showing that the classical capacity of a single n-gon state with n even is 1 bit, whereas it is larger than 1 bit when n is odd; by showing that transmitting a single n-gon state with n even violates information causality; and by showing studying the communication complexity cost of the nondeterministic not equal function using n-gon states.

Serge Massar; Manas K. Patra

2014-03-11

350

Information and communication in polygon theories  

NASA Astrophysics Data System (ADS)

Generalized probabilistic theories (GPTs) provide a framework in which one can formulate physical theories that includes classical and quantum theories, but also many other alternative theories. In order to compare different GPTs, we advocate an approach in which one views a state in a GPT as a resource and quantifies the cost of interconverting between different such resources. We illustrate this approach on polygon theories [New J. Phys. 13, 063024 (2011)., 10.1088/1367-2630/13/6/063024] that interpolate (as the number n of edges of the polygon increases) between a classical trit (when n =3) and a real quantum bit (when n =?). Our main results are that simulating the transmission of a single n-gon state requires more than one qubit, or more than log(log(n)) bits, and that n-gon states with n odd cannot be simulated by n'-gon states with n' even (for all n ,n'). These results are obtained by showing that the classical capacity of a single n-gon state with n even is 1 bit, whereas it is larger than 1 bit when n is odd; by showing that transmitting a single n-gon state with n even violates information causality; and by studying the communication complexity cost of the nondeterministic not-equal function using n-gon states.

Massar, Serge; Patra, Manas K.

2014-05-01

351

Incorporating existing network information into gene network inference.  

PubMed

One methodology that has met success to infer gene networks from gene expression data is based upon ordinary differential equations (ODE). However new types of data continue to be produced, so it is worthwhile to investigate how to integrate these new data types into the inference procedure. One such data is physical interactions between transcription factors and the genes they regulate as measured by ChIP-chip or ChIP-seq experiments. These interactions can be incorporated into the gene network inference procedure as a priori network information. In this article, we extend the ODE methodology into a general optimization framework that incorporates existing network information in combination with regularization parameters that encourage network sparsity. We provide theoretical results proving convergence of the estimator for our method and show the corresponding probabilistic interpretation also converges. We demonstrate our method on simulated network data and show that existing network information improves performance, overcomes the lack of observations, and performs well even when some of the existing network information is incorrect. We further apply our method to the core regulatory network of embryonic stem cells utilizing predicted interactions from two studies as existing network information. We show that including the prior network information constructs a more closely representative regulatory network versus when no information is provided. PMID:19710931

Christley, Scott; Nie, Qing; Xie, Xiaohui

2009-01-01

352

Information Management Methods in Sensor Networks1  

E-print Network

Information Management Methods in Sensor Networks1 L. MIHAYLOVA ,a 2 , A. NIX a , D. ANGELOVA b , D networks. The sensor management is treated in the light of different applications: detection are presented. Keywords: sensor networks, wireless networks, data fusion, mobility localisation 1. Motivation

Mihaylova, Lyudmila

353

SIA: secure information aggregation in sensor networks  

Microsoft Academic Search

Sensor networks promise viable solutions to many monitoring problems. However, the practical deployment of sensor networks faces many challenges imposed by real-world demands. Sensor nodes often have limited computation and communication resources and battery power. Moreover, in many applications sensors are deployed in open environments, and hence are vulnerable to physical attacks, potentially compromising the sensor's cryptographic keys.One of the

Bartosz Przydatek; Dawn Xiaodong Song; Adrian Perrig

2003-01-01

354

Progress on the Development of Future Airport Surface Wireless Communications Network  

NASA Technical Reports Server (NTRS)

Continuing advances in airport surface management and improvements in airport surface safety are required to enable future growth in air traffic throughout the airspace, as airport arrival and departure delays create a major system bottleneck. These airport management and safety advances will be built upon improved communications, navigation, surveillance, and weather sensing, creating an information environment supporting system automation. The efficient movement of the digital data generated from these systems requires an underlying communications network infrastructure to connect data sources with the intended users with the required quality of service. Current airport surface communications consists primarily of buried copper or fiber cable. Safety related communications with mobile airport surface assets occurs over 25 kHz VHF voice and data channels. The available VHF spectrum, already congested in many areas, will be insufficient to support future data traffic requirements. Therefore, a broadband wireless airport surface communications network is considered a requirement for the future airport component of the air transportation system. Progress has been made on defining the technology and frequency spectrum for the airport surface wireless communications network. The development of a test and demonstration facility and the definition of required testing and standards development are now underway. This paper will review the progress and planned future work.

Kerczewski, Robert J.; Budinger, James M.; Brooks, David E.; Franklin, Morgan; DeHart, Steve; Dimond, Robert P.; Borden, Michael

2009-01-01

355

The Intentional Distortion of Information in Organizational Communication: A Laboratory and Field Investigation  

Microsoft Academic Search

This report summarizes the results of several laboratory andfield studies in-vestigating antecedents to and consequences of the intentional distortion of information by senders in organizational communication networks. Lab-oratory studies were used to examine the impact of two interpersonal vari-ables (trust in the receiver, perceived influence of the receiver over the sender) and directionality of information flow (upward, lateral, and down-ward)

Charles A. OReilly

1978-01-01

356

AeroTCP: A Splitting Transport Protocol for an IP-based Satellite Network Supporting Aeronautical Communications  

E-print Network

Communications Yadong Shang* , Michael Hadjitheodosiou and John Baras Center for Satellite & Hybrid Communication to establish broadband aeronautical communication networks. Satellite network is recognized as one- ocean coverage. The expected advantages of the satellite systems for aeronautical communications also

Baras, John S.

357

TRYPNET. New hemoparasite information network.  

PubMed

Although Guyana, Suriname, and French Guiana share borders and climatic and geographic similarities, the countries have maintained little contact, due to language, political, and administrative differences. In 1993, two international organizations involved in the improvement of animal health, the Inter-American Institute for Cooperation on Agriculture (IICA) and CIRAD-EMVT (Centre de Cooperation Internationale en Recherche Agronomique pour le Developpement-Elevage et Medecine Veterinaire des Pays Tropicaux), jointly developed a collaborative project between the veterinary services of the three countries entitled "Hemoparasite Network for the Guianas." This project seeks to pool livestock, laboratory, and technical resources between the three countries in order to generate and exchange information on hemoparasites of livestock. A Hemoparasite Reference Laboratory for the Guianas has been created at the CIRAD-EMVT laboratory in Cayenne, French Guiana. Besides processing ruminant serum samples from the three countries, specialists from this organization conduct training in hemoparasite diagnostic techniques for laboratory personnel from Guyana and Suriname. A large-scale epidemiologic study of hemoparasites of cattle in the three countries is under way, to determine the prevalence, distribution, and clinical and economic significance of hemoparasites in the three countries, particularly Trypanosoma vivax and T. evansi. Preliminary results are presented and discussed. A Hemoparasite Information Network (TRYPNET) has been initiated, including a quarterly hemoparasite newsletter (TRYPNEWS), published in English and Spanish and disseminated to researchers in the Americas, Europe, and Africa. In 1995/96, it is proposed to expand the network's scope to include Venezuela and Brazil. PMID:8784498

Vokaty, S; Desquesnes, M; Applewhaite, L; Favre, J; Lieuw-A-Joe, R; Parris-Aaron, M; Bansse-Iisa, L

1996-07-23

358

Real-time communication in multi-hop networks  

Microsoft Academic Search

Communication in real-time systems has to be predictable, because unpredictable delays inthe delivery of messages can adversely affect the execution of tasks dependent on these messages.In this paper, we develop a scheme for providing predictable inter-process communication inreal-time systems with (partially connected) point--to--point interconnection networks, whichprovides guarantees on the maximum delivery time for messages. This scheme is based on theconcept

Dilip D. Kandlur; Kang G. Shin; Domenico Ferrari

1991-01-01

359

Real-time fieldbus communications using Profibus networks  

Microsoft Academic Search

This paper provides a comprehensive study on how to use Profibus fieldbus networks to support real-time industrial communications, that is, on how to ensure the transmission of real-time messages within a maximum bound time. Profibus is base on a simplified timed token (TT) protocol, which is a well-proved solution for real-time communication systems. However, Profibus differs with respect to the

Eduardo Tovar; Francisco Vasques

1999-01-01

360

Distance Preferences Small-World Communication Topology for Agent Network  

NASA Astrophysics Data System (ADS)

In multi-agent system (MAS), the communication topology of agent network plays a very important role in its collaboration. Small-world networks are the networks with high local clustering and small average path length, and the communication networks of MAS can be analyzed within the frame of small-world topology. Yet the real multiagent communication networks are abundant and the classical WS small-world model is not suitable for all cases. In this paper, two new small-world network models are presented. One is based on random graph substrate and local nodes preference reconnection and the other is based on regular graph substrate and long-range nodes preference reconnection. The characteristic of the network parameter such as the clustering coefficients, average path length, and eigenvalue ?2 and ?n of the Laplacian matrix for these two models and WS model is studied. The consensus problem that based on these three models is also studied. An example is given and the conclusions are made in the end.

Wu, Zhengping; Wang, Renming

361

Intrinsically secure communication in large-scale wireless networks  

E-print Network

The ability to exchange secret information is critical to many commercial, governmental, and military networks. Information-theoretic security - widely accepted as the strictest notion of security - relies on channel coding ...

Pinto, Pedro C. (Pedro Correia)

2010-01-01

362

Secure Communication among Cell Phones and Sensor Networks  

Microsoft Academic Search

Numerous applications, ranging from disaster management to smart buildings, have been proposed for sensor networks. The practicality of these applications depends on the ability of users to interact with these networks, in many cases in real time. In this paper we propose that cell phones interact with sensor networks and obtain the relevant information in real time. Cell phones can

Arjan Durresi; Vamsi Paruchuri

2009-01-01

363

Power, Avionics and Software Communication Network Architecture  

NASA Technical Reports Server (NTRS)

This document describes the communication architecture for the Power, Avionics and Software (PAS) 2.0 subsystem for the Advanced Extravehicular Mobile Unit (AEMU). The following systems are described in detail: Caution Warn- ing and Control System, Informatics, Storage, Video, Audio, Communication, and Monitoring Test and Validation. This document also provides some background as well as the purpose and goals of the PAS project at Glenn Research Center (GRC).

Ivancic, William D.; Sands, Obed S.; Bakula, Casey J.; Oldham, Daniel R.; Wright, Ted; Bradish, Martin A.; Klebau, Joseph M.

2014-01-01

364

Network Communication as a Service-Oriented Capability  

SciTech Connect

In widely distributed systems generally, and in science-oriented Grids in particular, software, CPU time, storage, etc., are treated as"services" -- they can be allocated and used with service guarantees that allows them to be integrated into systems that perform complex tasks. Network communication is currently not a service -- it is provided, in general, as a"best effort" capability with no guarantees and only statistical predictability. In order for Grids (and most types of systems with widely distributed components) to be successful in performing the sustained, complex tasks of large-scale science -- e.g., the multi-disciplinary simulation of next generation climate modeling and management and analysis of the petabytes of data that will come from the next generation of scientific instrument (which is very soon for the LHC at CERN) -- networks must provide communication capability that is service-oriented: That is it must be configurable, schedulable, predictable, and reliable. In order to accomplish this, the research and education network community is undertaking a strategy that involves changes in network architecture to support multiple classes of service; development and deployment of service-oriented communication services, and; monitoring and reporting in a form that is directly useful to the application-oriented system so that it may adapt to communications failures. In this paper we describe ESnet's approach to each of these -- an approach that is part of an international community effort to have intra-distributed system communication be based on a service-oriented capability.

Johnston, William; Johnston, William; Metzger, Joe; Collins, Michael; Burrescia, Joseph; Dart, Eli; Gagliardi, Jim; Guok, Chin; Oberman, Kevin; O'Conner, Mike

2008-01-08

365

Analysis of adaptive algorithms for an integrated communication network  

NASA Technical Reports Server (NTRS)

Techniques were examined that trade communication bandwidth for decreased transmission delays. When the network is lightly used, these schemes attempt to use additional network resources to decrease communication delays. As the network utilization rises, the schemes degrade gracefully, still providing service but with minimal use of the network. Because the schemes use a combination of circuit and packet switching, they should respond to variations in the types and amounts of network traffic. Also, a combination of circuit and packet switching to support the widely varying traffic demands imposed on an integrated network was investigated. The packet switched component is best suited to bursty traffic where some delays in delivery are acceptable. The circuit switched component is reserved for traffic that must meet real time constraints. Selected packet routing algorithms that might be used in an integrated network were simulated. An integrated traffic places widely varying workload demands on a network. Adaptive algorithms were identified, ones that respond to both the transient and evolutionary changes that arise in integrated networks. A new algorithm was developed, hybrid weighted routing, that adapts to workload changes.

Reed, Daniel A.; Barr, Matthew; Chong-Kwon, Kim

1985-01-01

366

A Secure Communication Suite for Underwater Acoustic Sensor Networks  

PubMed Central

In this paper we describe a security suite for Underwater Acoustic Sensor Networks comprising both fixed and mobile nodes. The security suite is composed of a secure routing protocol and a set of cryptographic primitives aimed at protecting the confidentiality and the integrity of underwater communication while taking into account the unique characteristics and constraints of the acoustic channel. By means of experiments and simulations based on real data, we show that the suite is suitable for an underwater networking environment as it introduces limited, and sometimes negligible, communication and power consumption overhead. PMID:23202204

Dini, Gianluca; Duca, Angelica Lo

2012-01-01

367

Non-line-of-sight underwater optical wireless communication network.  

PubMed

The growing need for ocean observation systems has stimulated considerable interest within the research community in advancing the enabling technologies of underwater wireless communication and underwater sensor networks. Sensors and ad hoc sensor networks are the emerging tools for performing extensive data-gathering operations on land, and solutions in the subsea setting are being sought. Efficient communication from the sensors and within the network is critical, but the underwater environment is extremely challenging. Addressing the special features of underwater wireless communication in sensor networks, we propose a novel non-line-of-sight network concept in which the link is implemented by means of back-reflection of the propagating optic signal at the ocean-air interface and derive a mathematical model of the channel. Point-to-multipoint links can be achieved in an energy efficient manner and broadcast broadband communications, such as video transmissions, can be executed. We show achievable bit error rates as a function of sensor node separation and demonstrate the feasibility of this concept using state-of-the-art silicon photomultiplier detectors. PMID:19252651

Arnon, Shlomi; Kedar, Debbie

2009-03-01

368

Simulation of Lunar Surface Communications Network Exploration Scenarios  

NASA Technical Reports Server (NTRS)

Simulations and modeling of surface-based communications networks provides a rapid and cost effective means of requirement analysis, protocol assessments, and tradeoff studies. Robust testing in especially important for exploration systems, where the cost of deployment is high and systems cannot be easily replaced or repaired. However, simulation of the envisioned exploration networks cannot be achieved using commercial off the shelf network simulation software. Models for the nonstandard, non-COTS protocols used aboard space systems are not readily available. This paper will address the simulation of realistic scenarios representative of the activities which will take place on the surface of the Moon, including selection of candidate network architectures, and the development of an integrated simulation tool using OPNET modeler capable of faithfully modeling those communications scenarios in the variable delay, dynamic surface environments. Scenarios for exploration missions, OPNET development, limitations, and simulations results will be provided and discussed.

Linsky, Thomas W.; Bhasin, Kul B.; White, Alex; Palangala, Srihari

2006-01-01

369

Enabling information management systems in tactical network environments  

NASA Astrophysics Data System (ADS)

Net-Centric Information Management (IM) and sharing in tactical environments promises to revolutionize forward command and control capabilities by providing ubiquitous shared situational awareness to the warfighter. This vision can be realized by leveraging the tactical and Mobile Ad hoc Networks (MANET) which provide the underlying communications infrastructure, but, significant technical challenges remain. Enabling information management in these highly dynamic environments will require multiple support services and protocols which are affected by, and highly dependent on, the underlying capabilities and dynamics of the tactical network infrastructure. In this paper we investigate, discuss, and evaluate the effects of realistic tactical and mobile communications network environments on mission-critical information management systems. We motivate our discussion by introducing the Advanced Information Management System (AIMS) which is targeted for deployment in tactical sensor systems. We present some operational requirements for AIMS and highlight how critical IM support services such as discovery, transport, federation, and Quality of Service (QoS) management are necessary to meet these requirements. Our goal is to provide a qualitative analysis of the impact of underlying assumptions of availability and performance of some of the critical services supporting tactical information management. We will also propose and describe a number of technologies and capabilities that have been developed to address these challenges, providing alternative approaches for transport, service discovery, and federation services for tactical networks.

Carvalho, Marco; Uszok, Andrzej; Suri, Niranjan; Bradshaw, Jeffrey M.; Ceccio, Philip J.; Hanna, James P.; Sinclair, Asher

2009-05-01

370

Networked sensors for the future force (NSFF) advanced technology demonstration (ATD) communications systems  

NASA Astrophysics Data System (ADS)

The U.S. Army"s Future Combat Systems (FCS) and Future Force Warrior (FFW) will rely on the use of unattended, tactical sensors to detect and identify enemy targets in order to avoid enemy fires and enable precise networked fire to survive on the future battlefield with less armor protection. Successful implementation of these critical sensor fields requires the development of a specialized communications network infrastructure needed to disseminate sensor data to provide relevant, timely and accurate situational awareness information to the tactical common operating picture. The sensor network communications must support both static deployed and mobile ground and air robotic sensor arrays with robust, secure, stealthy, and jam resistant links. It is envisioned that tactical sensor networks can be deployed in a two tiered communications architecture that includes a lower sensor sub-layer consisting of acoustic, magnetic, Chemical/Biological and seismic detectors and an upper sub-layer consisting of infrared or visual imaging cameras. The upper sub-layer can be cued by the lower sub-layer and provides a seamless gateway link to higher echelon backbone tactical networks. The NSFF Advanced Technology Demonstration (ATD) communications effort focuses on providing Future Force systems such as the FCS and the Future Force Warrior with critical situational awareness data needed for survivability. The communications systems supporting this functionality must be designed such that unattended ground sensor data can flow seamlessly from the lowest unattended tactical sensor echelons into the Army"s tactical backbone networks while also allowing the "fusing" of the data with other intelligence information for correlation within a tactical command and control node. NSFF is realizing this capability by using advanced communications technologies developed under the Soldier Level Integrated Communications Environment (SLICE) Soldier Radio Waveform (SRW) project. These technologies include robust, self-organizing/healing networking protocols, energy management techniques, and stealthy, secure, jam resistant radio equipment for a significantly enhanced communications capability for the Joint Tactical Radio System (JTRS). CERDEC laboratory and field demonstrations in 2004 will be reviewed to show early SRW development in preparation for the NSFF ATD as well as development of affordable systems for disposable sensor applications

Nemeroff, Jay; DiPierro, Stefano

2005-05-01

371

76 FR 25344 - Information Collection(s) Being Reviewed by the Federal Communications Commission  

Federal Register 2010, 2011, 2012, 2013, 2014

...AGENCY: Federal Communications Commission. ACTION...The Federal Communications Commission, as...the following information collection(s...of information technology; and (e) ways...further reduce the information collection burden...to the Federal Communications Commission....

2011-05-04

372

78 FR 76832 - Information Collection Being Reviewed by the Federal Communications Commission  

Federal Register 2010, 2011, 2012, 2013, 2014

...AGENCY: Federal Communications Commission. ACTION...The Federal Communications Commission (FCC...the following information collection, as...of information technology; and (e) ways...further reduce the information collection burden...to the Federal Communications Commission...

2013-12-19

373

76 FR 44007 - Information Collection Being Reviewed by the Federal Communications Commission  

Federal Register 2010, 2011, 2012, 2013, 2014

...AGENCY: Federal Communications Commission. ACTION...The Federal Communications Commission (FCC...the following information collection, as...of information technology; and (e) ways...further reduce the information collection burden...to the Federal Communications Commission...

2011-07-22

374

78 FR 12753 - Information Collection Being Reviewed by the Federal Communications Commission Under Delegated...  

Federal Register 2010, 2011, 2012, 2013, 2014

...Herman, Federal Communications Commission, via...First Responder Emergency Contact Information...first responder communications personnel, the...Commission will treat emergency contact information...and/or local emergency authorities...information. Federal Communications Commission....

2013-02-25

375

Topology-aware overlay networks for group communication  

Microsoft Academic Search

We propose an application level multicast approach, Topology Aware Grouping (TAG), which exploits underlying network topology information to build efficient overlay networks among multicast group members. TAG uses information about path overlap among members to construct a tree that reduces the overlay relative delay penalty, and reduces the number of duplicate copies of a packet on the same link. We

Minseok Kwon; Sonia Fahmy

2002-01-01

376

Evolutionary Information Diffusion over Social Networks  

E-print Network

Social networks have become ubiquitous in our daily life, as such it has attracted great research interests recently. A key challenge is that it is of extremely large-scale with tremendous information flow, creating the phenomenon of "Big Data". Under such a circumstance, understanding information diffusion over social networks has become an important research issue. Most of the existing works on information diffusion analysis are based on either network structure modeling or empirical approach with dataset mining. However, the information diffusion is also heavily influenced by network users' decisions, actions and their socio-economic connections, which is generally ignored in existing works. In this paper, we propose an evolutionary game theoretic framework to model the dynamic information diffusion process in social networks. Specifically, we analyze the framework in uniform degree and non-uniform degree networks and derive the closed-form expressions of the evolutionary stable network states. Moreover, t...

Jiang, Chunxiao; Liu, K J Ray

2013-01-01

377

Efficient data communication protocols for wireless networks  

NASA Astrophysics Data System (ADS)

In this dissertation, efficient decentralized algorithms are investigated for cost minimization problems in wireless networks. For wireless sensor networks, we investigate both the reduction in the energy consumption and throughput maximization problems separately using multi-hop data aggregation for correlated data in wireless sensor networks. The proposed algorithms exploit data redundancy using a game theoretic framework. For energy minimization, routes are chosen to minimize the total energy expended by the network using best response dynamics to local data. The cost function used in routing takes into account distance, interference and in-network data aggregation. The proposed energy-efficient correlation-aware routing algorithm significantly reduces the energy consumption in the network and converges in a finite number of steps iteratively. For throughput maximization, we consider both the interference distribution across the network and correlation between forwarded data when establishing routes. Nodes along each route are chosen to minimize the interference impact in their neighborhood and to maximize the in-network data aggregation. The resulting network topology maximizes the global network throughput and the algorithm is guaranteed to converge with a finite number of steps using best response dynamics. For multiple antenna wireless ad-hoc networks, we present distributed cooperative and regret-matching based learning schemes for joint transmit beanformer and power level selection problem for nodes operating in multi-user interference environment. Total network transmit power is minimized while ensuring a constant received signal-to-interference and noise ratio at each receiver. In cooperative and regret-matching based power minimization algorithms, transmit beanformers are selected from a predefined codebook to minimize the total power. By selecting transmit beamformers judiciously and performing power adaptation, the cooperative algorithm is shown to converge to pure strategy Nash equilibrium with high probability throughout the iterations in the interference impaired network. On the other hand, the regret-matching learning algorithm is noncooperative and requires minimum amount of overhead. The proposed cooperative and regret-matching based distributed algorithms are also compared with centralized solutions through simulation results.

Zeydan, Engin

378

On the capacity of information networks  

Microsoft Academic Search

An outer bound on the rate region of noise-free information networks is given. This outer bound combines properties of entropy with a strong information inequality derived from the structure of the network. This blend of information theoretic and graph theoretic arguments generates many interesting results. For example, the capacity of directed cycles is characterized. Also, a gap between the sparsity

Nicholas J. A. Harvey; Robert Kleinberg; April Rasala Lehman

2006-01-01

379

On the Capacity of Information Networks  

Microsoft Academic Search

An outer bound on the rate region of noise-free information networks is given. This outer bound combines prop- erties of entropy with a strong information inequality derived from the structure of the network. This blend of information theoretic and graph theoretic arguments generates many inter- esting results. For example, the capacity of directed cycles is characterized. Also, a gap between

Nicholas J. A. Harvey; Robert Kleinberg; April Rasala Lehman

2005-01-01

380

On the Capacity of Information Networks  

Microsoft Academic Search

We present the rst non-trivial outer bound on the rate region of general information networks, answering a question of Song, Yeung and Cai. This outer bound combines properties of entropy with a strong information inequality derived from the structure of the network. This blend of information theoretic and graph theoretic arguments generates many interesting results. For example, we exactly characterize

381

Signaling communication events in a computer network  

DOEpatents

A method, apparatus and program product for detecting a communication event in a distributed parallel data processing system in which a message is sent from an origin to a target. A low-level application programming interface (LAPI) is provided which has an operation for associating a counter with a communication event to be detected. The LAPI increments the counter upon the occurrence of the communication event. The number in the counter is monitored, and when the number increases, the event is detected. A completion counter in the origin is associated with the completion of a message being sent from the origin to the target. When the message is completed, LAPI increments the completion counter such that monitoring the completion counter detects the completion of the message. The completion counter may be used to insure that a first message has been sent from the origin to the target and completed before a second message is sent.

Bender, Carl A. (Highland, NY); DiNicola, Paul D. (Hurley, NY); Gildea, Kevin J. (Bloomington, NY); Govindaraju, Rama K. (Poughkeepsie, NY); Kim, Chulho (Poughkeepsie, NY); Mirza, Jamshed H. (Woodstock, NY); Shah, Gautam H. (Wappingers Falls, NY); Nieplocha, Jaroslaw (Richland, WA)

2000-01-01

382

Latin American Network Information Center  

NSDL National Science Digital Library

Started in 1992 and affiliated with the Lozano Long Institute of Latin American Studies at the University of Texas at Austin, the Latin American Network Information Center (LANIC) is designed to "facilitate access to Internet-based information to, from, or on Latin America." Their site was redesigned in the spring of 2008, and currently their various directories contain over 12,000 unique URLs for use by the general public. These links can be browsed by subject headings or by country, and visitors can look into more discrete topical headings like "food", "political science", and "social work". Along with these high-quality links, visitors can then click on over to their "Digital Initiatives" area. Here they will find digital collections that cover documents from the New Mexican Revolution and the full-text Fidel Castro Speech database. Visitors will also appreciate that many of the site's resources are available in Spanish and Portuguese.

383

Informing Workers of Chemical Hazards: The OSHA Hazard Communication Standard.  

ERIC Educational Resources Information Center

Practical information on how to implement a chemical-related safety program is outlined in this publication. Highlights of the federal Occupational Safety and Health Administrations (OSHA) Hazard Communication Standard are presented and explained. These include: (1) hazard communication requirements (consisting of warning labels, material safety

American Chemical Society, Washington, DC.

384

NICTA Report 2010 Information and Communications Technology (ICT) is  

E-print Network

NICTA Report 2010 #12;Information and Communications Technology (ICT) is everywhere, from fundamental advances in ICT R&D that are necessary to solve global challenges in areas such as health, safety and Communications Technology (ICT) Research Centre of Excellence, tackling the challenging problems in ICT research

Heiser, Gernot

385

Quantum Key Distribution in Large Scale Quantum Network Assisted by Classical Routing Information  

NASA Astrophysics Data System (ADS)

Recently, small-scale Quantum Key Distribution (QKD) networks have been demonstrated and continuously operated in field environment. However, nodes of these QKD networks are less than 10 nodes. When the scale and structure of these networks becomes large and complex, such networks will subject to problem of intractable routing selection and limited transmission distance. We present a novel quantum network model and the corresponding protocol to solve these problems. The proposed quantum network model integrates classical communication network with quantum key distribution layer. Nodes in this quantum network model are divided into communication nodes for classical communication and quantum nodes for quantum key distribution. We use atomic ensembles to create entangled photons inside quantum nodes. Quantum repeaters are used to establish entanglement between remote quantum nodes so the maximum distribution distance of entangled photons can be extended. The main idea is to establish an appropriate key distribution path in the quantum key distribution layer based on the routing information obtained by the upper classical communication network. After the entanglement has been established between remote quantum nodes, these nodes will use the Ekert91 or BBM92 protocol to generate secret keys shared between each other. Then, these keys can be used to ensure the security of communication in the classical communication network.

Wu, Diance; Yu, Wanrong; Zhao, Baokang; Wu, Chunqing

2014-10-01

386

Technology forecasting for space communication. [analysis of systems for application to Spacecraft Data and Tracking Network  

NASA Technical Reports Server (NTRS)

A study was conducted to determine techniques for application to space communication. The subjects considered are as follows: (1) optical communication systems, (2) laser communications for data acquisition networks, (3) spacecraft data rate requirements, (4) telemetry, command, and data handling, (5) spacecraft tracking and data network antenna and preamplifier cost tradeoff study, and (6) spacecraft communication terminal evaluation.

1973-01-01

387

The Effect of Cognitive Type and Communications Style on the Communication of Management Information System Concepts.  

ERIC Educational Resources Information Center

Results of exploratory investigation indicate that failures to communicate management information systems (MIS) concepts can result from the sender's communication style being inappropriate to the receiver's cognitive type. Details of the research methodology, analysis of variance, and summary of results are given, as well as recommendations for

Davis, Donald L.

1983-01-01

388

What is the role of constructivist teachers within faculty communication networks?  

NASA Astrophysics Data System (ADS)

Using the biology faculty of one high school (n = 9) and the mathematics faculty of another (n = 16), this study tested the hypothesis that constructivist teachers play an active role within teacher communication networks (the constructivist-teacher hypothesis). This hypothesis contrasts with the view that constructivist teachers operate alone and largely severed from communications among colleagues. Two types of representations of communication patterns among faculty members (i.e., sociographs) were created and analyzed for each faculty. One type of sociograph plotted communications concerning content/pedagogical issues while the other type plotted social/informal communications. Trained raters assessed constructivist-teaching practices using the Reformed Teaching Observation Protocol (RTOP). Positive relationships were found between constructivist-teaching practices and the frequency and significance of communications within both faculties - more so for content/pedagogical issues than for social/informal communications. Importantly, peers sought out constructivist teachers more often than they did traditional teachers, presumably seeking advice regarding teaching practice. Results support the constructivist-teacher hypothesis and indicate that constructivist teachers are not isolated from their peers. Instead, they appear to play an active role, particularly when colleagues are discussing issues related to content and pedagogy.

Judson, Eugene; Lawson, Anton E.

2007-03-01

389

A network model for wide area access to structural information.  

PubMed Central

Structural information in medicine is information about the physical body. Recent advances in medical imaging and biotechnology have greatly increased the amount and importance of structural information, and advances in networking envisioned by the High Performance Computing and Communication Initiative (HPCC) will allow this kind of information to be delivered to remote clients over wide area networks. One of the most important factors determining the usability of such a client-server configuration is the time delay between the request for information from the server, and its presentation to the user at the client. In this paper we present a model for predicting the performance of a structural information client based on the ping time, a simple, unobtrusive network measurement. Preliminary results suggest that the relationship between ping time and transfer time for large files is linear, which if borne out by more data, will allow the performance of structural information clients at remote sites to be predicted without the expense of installing them first. At the same time, such a model will be useful for planning improvements to the network in those sites which could most benefit by wide area access to structural information. PMID:8130523

Dailey, D. J.; Eno, K.; Zick, G. L.; Brinkley, J. F.

1993-01-01

390

Computer-Communications Networks and Teletraffic.  

ERIC Educational Resources Information Center

Bi-directional cable TV (CATV) systems that are being installed today may not be well suited for computer communications. Older CATV systems are being modified to bi-directional transmission and most new systems are being built with bi-directional capability included. The extreme bandwidth requirement for carrying 20 or more TV channels on a

Switzer, I.

391

Distributed sensing and communications in tactical robotic networks  

Microsoft Academic Search

In this paper, we address the issues of distributed sensing, communications, mobility control, and self-configuration in robotic networks. In particular, we develop a distributed algorithm that exploits the proactive movements of robotic platforms to achieve a perfect balance between providing sensing coverage and maintaining RF connectivity. The main elements of our proposed approach are based on the concept of virtual

Kyle Guan; Dominic Imbrenda; Reza Ghanadan; Jessica Hsu

2008-01-01

392

Generating UAV Communication Networks for Monitoring and Surveillance  

E-print Network

Generating UAV Communication Networks for Monitoring and Surveillance Per-Magnus Olsson, Jonas, especially when smaller UAVs are used. Both problems can be solved to creating relay chains for surveillance different trade-offs between the number of UAVs in the chain and the chain's cost. We also show new results

Doherty, Patrick

393

Adaptive MAC Protocol for UAV Communication Networks Using Directional Antennas  

E-print Network

Adaptive MAC Protocol for UAV Communication Networks Using Directional Antennas Abdel Ilah Alshbatat and Liang Dong, Senior Member, IEEE Abstract-- Unmanned aerial vehicle (UAV) has been used inspection and range extension. Moreover, UAVs are suited for situations that are too dangerous for direct

Dong, Liang

394

Role of Communication Networks in Behavioral Systems Analysis  

ERIC Educational Resources Information Center

This article provides an overview of communication networks and the role of verbal behavior in behavioral systems analysis. Our discussion highlights styles of leadership in the design and implementation of effective organizational contingencies that affect ways by which coordinated work practices are managed. We draw upon literature pertaining to

Houmanfar, Ramona; Rodrigues, Nischal Joseph; Smith, Gregory S.

2009-01-01

395

THE BEHAVIOR OF ETHERNET-LIKE COMPUTER COMMUNICATIONS NETWORKS  

E-print Network

THE BEHAVIOR OF ETHERNET-LIKE COMPUTER COMMUNICATIONS NETWORKS Guy T. Almes and Edward D. Lazowska the widespread influence of Ethernet, a surprising amount of confusion exists concerning various important the policies common to Ethernet-like systems and by using an analytic model to study their behavior. We

Anderson, Richard

396

Energy-Efficient Communication Protocol for Wireless Microsensor Networks  

Microsoft Academic Search

Wireless distributed microsensor systems will enable the reliable monitoring of a variety of environments for both civil and military applications. In this paper, we look at communication protocols, which can have significant im- pact on the overall energy dissipation of these networks. Based on our findings that the conventional protocols of direct transmission, minimum-transmission-energy, multi- hop routing, and static clustering

Wendi Rabiner Heinzelman; Anantha Chandrakasan; Hari Balakrishnan

2000-01-01

397

A k-anonymous communication protocol for overlay networks  

Microsoft Academic Search

Anonymity is increasingly important for network applica- tions concerning about censorship and privacy. The ex- isting anonymous communication protocols generally stem from mixnet and DC-net. They either cannot provide prov- able anonymity or sufier from transmission collision. In this paper, we introduce a novel approach which takes advan- tage of hierarchical ring structure and mix technique. This proposed protocol is

Pan Wang; Peng Ning; Douglas S. Reeves

2007-01-01

398

Indian-Spanish Communication Networks: Continuity in the Greater Southwest.  

ERIC Educational Resources Information Center

Trade and communication networks established by Indian groups in the 15th century A.D. linked the Southwest to Mesoamerica, the Plains and the Pacific littoral; these routes were later used by the Spanish and Americans, and today major highways follow ancient Indian routes. The main east-west route had major termini at Cibola (near Zuni) in the

Riley, Carroll L.; Manson, Joni L.

399

Communicability and Communities in Complex Socio-Economic Networks  

E-print Network

-8505, Japan Abstract The concept of communicability is introduced for complex socio-economic net- works of metal.' We determine the community structure of this network showing that there are 27 communities by these critical situations, i.e., economical crisis. These weakest links are clearly identified and represent

Mottram, Nigel

400

A NON-EQUILIBRIUM ANALYSIS & CONTROL FRAMEWORK FOR COMMUNICATION NETWORKS  

E-print Network

A NON-EQUILIBRIUM ANALYSIS & CONTROL FRAMEWORK FOR COMMUNICATION NETWORKS Tansu Alpcan Paul Wang@control.csl.uiuc.edu Abstract: We present a non-equilibrium analysis and control approach for the Active Queue Management (AQM of the complex dynamic queue behavior to show that non-equilibrium methods are essential for analysis

Alpcan, Tansu

401

ICEBERG: an Internet core network architecture for integrated communications  

Microsoft Academic Search

In the ICEBERG project at UC Berkeley, we are developing an Internet-based integration of telephony and data services spanning diverse access networks. Our primary goals are extensibility, scalability, robustness, and personalized communication. We leverage the Internet's low cost of entry for service creation, provision, deployment, and integration. We present our solutions to signaling, easy service creation, resource reservation, admission control,

Helen J. Wang; Bhaskaran Raman; Chen-Nee Chuah; Rahul Biswas; Ramakrishna Gummadi; Barbara Hohlt; Xia Hong; Emre Kiciman; Zhuoqing Mao; Jimmy S. Shih; L. Subraimanian; B. Y. Zhno; Anthony D. Joseph; Randy H. Katz

2000-01-01

402

Communication Network For Metropolitan Area Interhospital Image Exchange  

NASA Astrophysics Data System (ADS)

Electronic exchange of digital images among health care sites can be accomplished rapidly and economically. Data communications computers attached to existing municipal CATV cable systems can provide transfer of images to remote locations for viewing and archiving. A broadband image communication network has been constructed in the Lansing, Michigan area linking a central image display and interpretation center at Michigan State University to 3 Computed tomography (CT) scanners located in separate community hospitals up to eight miles away. Reconstructed compressed CT images are automatically transmitted from the hospitals to the central viewing site in a few seconds. An electronic mail facility provides for user communications among all network sites. Key to the economic and operational feasibility is the availability of leased channel bandwidth (3MHz total) supplied by two local CATV companies and a university cable service which are all interconnected. Channel characteristics and experience to date with such a complex cable network is reviewed. This demonstration of a metropolitan area image communication network opens new opportunities for expanded relationships and services among hospitals, outpatient clinics, and associated professional groups.

Siebert, James E.; Rosenbaum, Terry L.; Oosterwijk, Herman

1985-09-01

403

Demo Abstract: Claytronics Highly Scalable Communications, Sensing, and Actuation Networks  

E-print Network

out the possibility of radically altering the relationship between computation, humans.9 [Artificial Intelligence]: Robotics ­ modular reconfigurable robots. C.2.4 [Computer Communications Networks to morph into three-dimensional scenes, eventually with sufficient fidelity so as to convince a human

Gibbons, Phillip B.

404

ANU Service Desk project communication overview Further information  

E-print Network

supporting Alliance in the Information Literacy Program (ILP), Teaching and Learning Commons Support ServiceANU Service Desk project communication overview April 2013 Further information The most up of Information Technology Services (ITS) to the new Service Desk tool (ServiceNow) in March, statistics have

405

Inter-vehicle communications: assessing information dissemination under safety constraints  

Microsoft Academic Search

The main goal of inter-vehicle communication technologies is to provide each vehicle with the required information about its surrounding in order to assist the driver avoiding potential dangers. The required information level, or awareness, can be achieved by the exchange of periodic status messages (beacons) among neighboring vehicles together with the quick dissemination of information about potential hazards. In previous

Marc Torrent-Moreno

2007-01-01

406

Information theory, animal communication, and the search for extraterrestrial intelligence  

Microsoft Academic Search

We present ongoing research in the application of information theory to animal communication systems with the goal of developing additional detectors and estimators for possible extraterrestrial intelligent signals. Regardless of the species, for intelligence (i.e., complex knowledge) to be transmitted certain rules of information theory must still be obeyed. We demonstrate some preliminary results of applying information theory to socially

Laurance R. Doyle; Brenda McCowan; Simon Johnston; Sean F. Hanser

2011-01-01

407

Defining Information Needs of Computer Users: A Human Communication Problem.  

ERIC Educational Resources Information Center

This exploratory investigation of the process of defining the information needs of computer users and the impact of that process on information retrieval focuses on communication problems. Six sites were visited that used computers to process data or to provide information, including the California Department of Transportation, the California

Kimbrough, Kenneth L.

408

Tsallis information dimension of complex networks  

NASA Astrophysics Data System (ADS)

The fractal and self-similarity properties are revealed in many complex networks. The information dimension is a useful method to describe the fractal and self-similarity properties of the complex networks. In order to show the influence of different parts in the complex networks to the information dimension, we have proposed a new information dimension based on the Tsallis entropy namely the Tsallis information dimension. The proposed information dimension is changed according to the scale which is described by the nonextensivity parameter q, and it is inverse with the nonextensivity parameter q. The existing information dimension is a special case of the Tsallis information dimension when q = 1. The Tsallis information dimension is a generalized information dimension of the complex networks.

Zhang, Qi; Luo, Chuanhai; Li, Meizhu; Deng, Yong; Mahadevan, Sankaran

2015-02-01

409

Managing perceptions of information overload in computer-mediated communication  

E-print Network

Many studies report information overload (IO) as one of the main problems students encounter in computer-mediated communication (CMC). To date, researchers have paid little attention to the problem of IO?more specifically, to its impact on students...

Chen, Chun-Ying

2005-02-17

410

Analysis of network traffic in ad-hoc networks based on DSDV protocol with emphasis on mobility and communication patterns  

Microsoft Academic Search

An ad-hoc network is a collection of mobile nodes dynamically forming a temporary network without the use of any existing network infrastructure or centralized administration. Because of the limited communication range among mobile nodes in ad-hoc networks, several network hops may be needed to deliver a packet from one node to another one in the wireless network. In recent years,

V. Garousi

2005-01-01

411

An adaptive digital beamforming network for satellite communication systems  

NASA Astrophysics Data System (ADS)

The use of adaptive digital beamforming techniques has, until recently, been largely restricted to high performance military radar systems. Recent advances in digital technology, however, have enabled the design of single chip digital beamforming networks. This, coupled with advances in digital signal processor technology, enables complete beamforming systems to be constructed at a lower cost, thus making the application of these techniques to commercial communications systems attractive. The design and development of such an adaptative digital beamforming network are described. The system is being developed as a proof of concept laboratory based demonstrator to enable the feasibility of adaptive digital beamforming techniques for communication systems to be determined. Ultimately, digital beamforming could be used in conjunction with large array antennas for communication satellite systems. This will enable the simultaneous steering of high gain antenna beams in the direction of ground based users and the nulling of unwanted interference sources, such as radar systems, to be performed.

Barrett, M.; Fernandez, J.; Lagunas, M. A.; Coromina, F.

1991-10-01

412

HealthShare: Achieving secure and privacy-preserving health information sharing through health social networks  

E-print Network

As the ever-increasing demand for a secure and efficient health- care communication, health social networks and wireless communications have revealed the possibility of providing pervasive health monitoring to patientsHealthShare: Achieving secure and privacy-preserving health information sharing through health

Shen, Xuemin "Sherman"

413

Reliable information management in a low-cost wireless structural monitoring and control network  

E-print Network

as the primary communication link. Cable installation is labor intensive and time consuming, and can cost as muchReliable information management in a low-cost wireless structural monitoring and control network to transmit sensor data and actuation signals. With recent advances in wireless communication technology

Lynch, Jerome P.

414

What is GIS? Biomanufacturing Information and Communications Technologies  

NSDL National Science Digital Library

The ATETV project delivers web-based videos to connect students to careers in advanced technology. This episode from ATETV asks the question, "What is GIS?" and explores biomanufacturing and information and communications technologies. The episode can be watched in full or through the three segments: "What is GIS?," "Biomanufacturing Products from Living Cells," and "Information and Communications Technologies." Running time for the full episode of this streaming video is 7:22.

2010-07-20

415

Communications performance of an undersea acoustic large-area network  

NASA Astrophysics Data System (ADS)

The U.S. Navy is developing Seaweb acoustic networking capability for integrating undersea systems. Seaweb architectures generally involve a wide-area network of fixed nodes consistent with future distributed autonomous sensors on the seafloor. Mobile nodes including autonomous undersea vehicles (AUVs) and submarines operate in the context of the grid by using the fixed nodes as both navigation reference points and communication access points. In October and November 2004, Theater Anti-Submarine Warfare Exercise (TASWEX04) showcased Seaweb in its first fleet appearance. This paper evaluates the TASWEX04 Seaweb performance in support of networked communications between a submarine and a surface ship. Considerations include physical-layer dependencies on the 9-14 kHz acoustic channel, such as refraction, wind-induced ambient noise, and submarine aspect angle. [Work supported by SSC San Diego.

Kriewaldt, Hannah A.; Rice, Joseph A.

2005-04-01

416

Partial synchronization in stochastic dynamical networks with switching communication channels  

NASA Astrophysics Data System (ADS)

In this paper, the partial synchronization problem of stochastic dynamical networks (SDNs) is investigated. Unlike the existing models, the SDN considered in this paper suffers from a class of communication constraintonly part of nodes' states can be transmitted. Thus, less nodes' states can be used to synchronize the SDN, which makes the analysis of the synchronization problem much harder. A set of channel matrices are introduced to reflect such kind of constraint. Furthermore, due to unpredictable environmental changes, the channel matrices can switch among some communication modes. The switching considered here is governed by a Markov process. To overcome the difficulty, a regrouping method is employed to derive our main results. The obtained conditions guarantee that partial synchronization can be achieved for SDNs under switching communication constraint. Finally, numerical examples are given to illustrate the effectiveness of the theoretical results and how the communication constraint influences synchronization result.

Huang, Chi; Ho, Daniel W. C.; Lu, Jianquan; Kurths, Jrgen

2012-06-01

417

Sailor: Maryland's Online Public Information Network  

NSDL National Science Digital Library

Sailor - Maryland's Information Network - provides general Maryland government information and a wide variety of Internet jump-points. The gopher is run by the Pratt Free Library and also has local dialup numbers in Maryland.

1999-01-01

418

NETWORKS, NETWAR, AND INFORMATION AGE TERRORISM  

Microsoft Academic Search

The rise of network forms of organization is a key consequence of the ongoing information revolution. Business organizations are being newly energized by networking, and many professional militaries are experimenting with flatter forms of organization. In this chapter, we explore the impact of networks on terrorist capabilities, and consider how this development may be associated with a move away from

John Arquilla; David Ronfeldt; Michele Zanini

419

Information Spread of Emergency Events: Path Searching on Social Networks  

PubMed Central

Emergency has attracted global attentions of government and the public, and it will easily trigger a series of serious social problems if it is not supervised effectively in the dissemination process. In the Internet world, people communicate with each other and form various virtual communities based on social networks, which lead to a complex and fast information spread pattern of emergency events. This paper collects Internet data based on data acquisition and topic detection technology, analyzes the process of information spread on social networks, describes the diffusions and impacts of that information from the perspective of random graph, and finally seeks the key paths through an improved IBF algorithm. Application cases have shown that this algorithm can search the shortest spread paths efficiently, which may help us to guide and control the information dissemination of emergency events on early warning. PMID:24600323

Hu, Hongzhi; Wu, Tunan

2014-01-01

420

Wireless communication between AGVs (autonomous guided vehicles) and the industrial network CAN (controller area network)  

Microsoft Academic Search

The wireless communications and industrial networks are two powerful technologies for the rapidly growing manufacturing industry. The combination of the above is the key to productivity with the lowest possible cost. The technology of wireless AGVs is mature enough to be widely utilized to industrial automation. In addition, the development of industrial network CAN is able to offer a robust

Valentinos K. Kongezos; Charles R. Allen

2002-01-01

421

Adaptive Information Coding for Secure and Reliable Telesurgery Communications  

E-print Network

TRS robots aim to perform robotic surgery over nearly any type of communication networks including.edu Abstract--Telesurgical Robot Systems (TRS) have been the focus of research in academic, military specified to allow interoperability of these surgical robots and surgical robot controllers. However

Wang, Yongge

422

Mobile power management for wireless communication networks  

Microsoft Academic Search

For fixed quality-of-service constraints and varying channel interference, how should a mobile node in a wireless network adjust its transmitter power so that energy consumption is minimized? Several transmission schemes are considered, and optimal solutions are obtained for channels with stationary, extraneous interference. A simple dynamic power management algorithm based on these solutions is developed. The algorithm is tested by

John M. Rulnick; Nicholas Bambos

1997-01-01

423

Technische Universitt Mnchen Institute of Communication Networks  

E-print Network

. EberspächerNK L CENTER FOR DIGITAL TECHNOLOGY & MANAGEMENT Technische Universität München CHAIR OF GEODESY Faculty of Civil Engineering and Geodesy Univ. Prof. Dr.-Ing. habil. Thomas A. Wunderlich Maximilian Networks, 245Chair of Software and Systems Engineering, 3Chair of Geodesy, Technical University of Munich

424

Fast massive preventive security and information communication systems  

NASA Astrophysics Data System (ADS)

We present a fast massive information communication system for data collection from distributive sources such as cell phone users. As a very important application one can mention preventive notification systems when timely notification and evidence communication may help to improve safety and security through wide public involvement by ensuring easy-to-access and easy-to-communicate information systems. The technology significantly simplifies the response to the events and will help e.g. special agencies to gather crucial information in time and respond as quickly as possible. Cellular phones are nowadays affordable for most of the residents and became a common personal accessory. The paper describes several ways to design such systems including existing internet access capabilities of cell phones or downloadable specialized software. We provide examples of such designs. The main idea is in structuring information in predetermined way and communicating data through a centralized gate-server which will automatically process information and forward it to a proper destination. The gate-server eliminates a need in knowing contact data and specific local community infrastructure. All the cell phones will have self-localizing capability according to FCC E911 mandate, thus the communicated information can be further tagged automatically by location and time information.

Akopian, David; Chen, Philip; Miryakar, Susheel; Kumar, Abhinav

2008-04-01

425

Cooperative Planning for UAS-based Sensor Networks In Realistic Communication Environments  

NASA Astrophysics Data System (ADS)

This dissertation develops a unified, tractable algorithm for distributed planning for multiple unmanned aircraft based sensor networks with performance bounds. An information-theoretic objective function is derived that incorporates sensing and communication to guide a cooperative team of unmanned aircraft. The communication is modelled with packet erasure channels for each link in a multi-hop mesh network. This objective is shown to be intractable and assumptions are made to find a tractable formulation. This tractable formulation is then distributed using the chain rule of mutual information and optimization algorithms are designed with performance bounds for different scenarios and compared against the fully centralized mutual information approach. This comparison is done analytically using submodularity under certain assumptions and Monte Carlo simulations to evaluate the algorithms when these assumptions break down. A novel unmanned aircraft system platform was developed to facilitate experiments with multiple unmanned aircraft utilizing sensing and multi-hop mesh networking. This system was used to perform localization experiments of radio frequency emitters based on the received signal strength measurement. The planning algorithms were demonstrated with multiple aircraft to show there validity and tractability on a real world scenario. These experiments were used to asses the algorithms performance showing the improvement in sensing is appreciable and specifically the benefits of utilizing multi-hop communication.

Stachura, M.

426

Protocol for a Delay-Tolerant Data-Communication Network  

NASA Technical Reports Server (NTRS)

As its name partly indicates, the Delay-Tolerant Networking (DTN) Bundle Protocol is a protocol for delay-tolerant transmission of data via communication networks. This protocol was conceived as a result of studies of how to adapt Internet protocols so that Internet-like services could be provided across interplanetary distances in support of deep-space exploration. The protocol, and software to implement the protocol, is being developed in collaboration among experts at NASA's Jet Propulsion Laboratory and other institutions. No current Internet protocols can accommodate long transmission delay times or intermittent link connectivity. The DTN Bundle Protocol represents a departure from the standard Internet assumption that a continuous path is available from a host computer to a client computer: It provides for routing of data through networks that may be disjointed and may be characterized by long transmission delays. In addition to networks that include deepspace communication links, examples of such networks include terrestrial ones within which branches are temporarily disconnected. The protocol is based partly on the definition of a message-based overlay above the transport layers of the networks on which it is hosted.

Torgerson, Jordan; Hooke, Adrian; Burleigh, Scott; Fall, Kevin

2004-01-01

427

77 FR 37041 - Information Collection(s) Being Reviewed by the Federal Communications Commission for Extension...  

Federal Register 2010, 2011, 2012, 2013, 2014

...Reviewed by the Federal Communications Commission for Extension...Requested AGENCY: Federal Communications Commission. ACTION...3502-3520), the Federal Communications Commission invites...comment on the following information collection(s...forms of information technology; and ways to...

2012-06-20

428

77 FR 20021 - Information Collection Being Reviewed by the Federal Communications Commission Under Delegated...  

Federal Register 2010, 2011, 2012, 2013, 2014

...Reviewed by the Federal Communications Commission Under Delegated...Authority AGENCY: Federal Communications Commission. ACTION...3501-3520), the Federal Communications Commission invites...comment on the following information collection(s...forms of information technology; and (e) ways...

2012-04-03

429

76 FR 66065 - Information Collection(s) Being Reviewed by the Federal Communications Commission Comments Requested  

Federal Register 2010, 2011, 2012, 2013, 2014

...Reviewed by the Federal Communications Commission Comments...Requested AGENCY: Federal Communications Commission. ACTION...3501-3520), the Federal Communications Commission invites...comment on the following information collection(s...forms of information technology; and (e) ways...

2011-10-25

430

76 FR 28843 - Meeting of Advisory Committee on International Communications and Information Policy  

Federal Register 2010, 2011, 2012, 2013, 2014

...foreign industrial and regulatory policy, the activities of international...Communications and Information Policy. The meeting's agenda will...importance to U.S. communications policy interests including information and communications technology (ICT) and international...

2011-05-18

431

Future large broadband switched satellite communications networks  

NASA Technical Reports Server (NTRS)

Critical technical, market, and policy issues relevant to future large broadband switched satellite networks are summarized. Our market projections for the period 1980 to 2000 are compared. Clusters of switched satellites, in lieu of large platforms, etc., are shown to have significant advantages. Analysis of an optimum terrestrial network architecture suggests the proper densities of ground stations and that link reliabilities 99.99% may entail less than a 10% cost premium for diversity protection at 20/30 GHz. These analyses suggest that system costs increase as the 0.6 power of traffic. Cost estimates for nominal 20/30 GHz satellite and ground facilities suggest optimum system configurations might employ satellites with 285 beams, multiple TDMA bands each carrying 256 Mbps, and 16 ft ground station antennas. A nominal development program is outlined.

Staelin, D. H.; Harvey, R. R.

1979-01-01

432

Clinical grade - a foundation for healthcare communications networks  

Microsoft Academic Search

Healthcare is adopting information technology as an integral part of clinical workflows and processes themselves. This places substantial demands upon the performance and behavior of such networks, especially as the paper records systems are retired, leading to the fundamental attributes of clinical grade networks for healthcare.

AlanF Graves; B. Wallace; S. Periyalwar; C. Riccardi

2005-01-01

433

Network Management for Picture Archiving and Communication Systems (PACS)  

E-print Network

in hospital Simple Network Management Protocol (SNMP) overview Software design Software functions Conclusions #12;3 Project scope Investigate the possibility of applying SNMP to information systems in hospital Develop software to monitor PACS using SNMP Demonstrate the use of SNMP for managing hospital network #12

Trajkovic, Ljiljana

434

76 FR 5159 - Notice of Public Information Collection(s) Being Reviewed by the Federal Communications...  

Federal Register 2010, 2011, 2012, 2013, 2014

...The Federal Communications Commission...the following information collection...information technology, and (e...The required information shall be filed...authorization. This information is also used...involving new technologies or new uses...spectrum. Federal Communications...

2011-01-28

435

78 FR 64212 - Information Collections Being Reviewed by the Federal Communications Commission; Comments Requested  

Federal Register 2010, 2011, 2012, 2013, 2014

...the Federal Communications Commission...the following information collections...information technology; and ways...proposed in this information collection...the Geocoded Information for Phase I...Broadband Technology Opportunities...instructions. Federal Communications...

2013-10-28

436

Scaling of data communications for an advanced supercomputer network  

NASA Technical Reports Server (NTRS)

The goal of NASA's Numerical Aerodynamic Simulation (NAS) Program is to provide a powerful computational environment for advanced research and development in aeronautics and related disciplines. The present NAS system consists of a Cray 2 supercomputer connected by a data network to a large mass storage system, to sophisticated local graphics workstations and by remote communication to researchers throughout the United States. The program plan is to continue acquiring the most powerful supercomputers as they become available. The implications of a projected 20-fold increase in processing power on the data communications requirements are described.

Levin, E.; Eaton, C. K.; Young, Bruce

1986-01-01

437

Aerial networking communication solutions using Micro Air Vehicle (MAV)  

NASA Astrophysics Data System (ADS)

The application of a Micro Air Vehicle (MAV) for wireless networking is slowly gaining significance in the field of network robotics. Aerial transport of data requires efficient network protocols along with accurate positional adjustment of the MAV to minimize transaction times. In our proof of concept, we develop an Aerial networking protocol for data transfer using the technology of Disruption Tolerant Networks (DTN), a store-and-forward approach for environments that deals with disrupted connectivity. Our results show that close interaction between networking and flight behavior helps in efficient data exchange. Potential applications are in areas where network infrastructure is minimal or unavailable and distances may be large. For example, forwarding video recordings during search and rescue, agriculture, swarm communication, among several others. A practical implementation and validation, as described in this paper, presents the complex dynamics of wireless environments and poses new challenges that are not addressed in earlier work on this topic. Several tests are evaluated in a practical setup to display the networking MAV behavior during such an operation.

Balasubramanian, Shyam; de Graaf, Maurits; Hoekstra, Gerard; Corporaal, Henk; Wijtvliet, Mark; Cuadros Linde, Javier

2014-10-01

438

Effective integration of information and communications technology in teacher education  

Microsoft Academic Search

Effective delivery of the new information technology (IT) curriculum for student teachers in the United Kingdom, which started in September 1998, is an important challenge for initial teacher training institutions. This article identifies three main obstacles that may limit its successful implementation student access to computers, the communications and information technology (ICT) policy adopted by initial teacher training providers

Colette Murphy; Lillian Greenwood

1998-01-01

439

PIR-Tor: Scalable Anonymous Communication Using Private Information Retrieval  

E-print Network

PIR-Tor: Scalable Anonymous Communication Using Private Information Retrieval Prateek Mittal1 Femi like Tor do not scale well as they require all users to maintain up-to- date information about all available Tor relays in the sys- tem. Current proposals for scaling anonymous commu- nication advocate

Goldberg, Ian

440

Nonlinear limits to the information capacity of optical fiber communications  

Microsoft Academic Search

The exponential growth in the rate at which information can be communicated through an optical fiber is a key element in the so called information revolution. However, like all exponential growth laws, there are physical limits to be considered. The nonlinear nature of the propagation of light in optical fiber has made these limits difficult to elucidate. Here we obtain

Partha P. Mitra; Jason B. Stark

2000-01-01

441

Communicating Ocean Sciences to Informal Audiences (COSIA): Interim Evaluation Report  

ERIC Educational Resources Information Center

Communicating Ocean Sciences to Informal Audiences (COSIA) is a National Science Foundation (NSF)-funded project consisting of seven long-term three-way partnerships between the Lawrence Hall of Science (LHS) and an informal science education institution (ISEI) partnered with an institution of higher education (IHE). Together, educators from the

St. John, Mark; Phillips, Michelle; Smith, Anita; Castori, Pam

2009-01-01

442

Communicating Ocean Sciences to Informal Audiences (COSIA): Final Evaluation Report  

ERIC Educational Resources Information Center

Communicating Ocean Sciences to Informal Audiences (COSIA) is a National Science Foundation (NSF)-funded project consisting of six three-way partnerships between the Lawrence Hall of Science (LHS) and an informal science education institution (ISEI) partnered with an institution of higher education (IHE). Together, educators from the ISEI (often

Phillips, Michelle; St. John, Mark

2010-01-01

443

Information and communication tools as aids to collaborative sensemaking  

Microsoft Academic Search

Collaborative sensemaking occurs when multiple actors engage in understanding an unfamiliar, information-rich environment. We present preliminary results from a field study of the collaborative activities of healthcare providers in an emergency department. The goal of our study was to explore the nature of collaborative sensemaking and the role various information and communication tools play in the process. We describe how

Sharoda A. Paul; Madhu C. Reddy; Christopher J. deFlitch

2008-01-01

444

Scalable Foveated Visual Information Coding and Communications Ligang Lu,1  

E-print Network

Scalable Foveated Visual Information Coding and Communications Ligang Lu,1 Zhou Wang2 and Alan C Abstract: This paper introduces our recent research work on the development of a scalable foveated visual rate in terms of foveated visual quality measurement. Such a scalable foveated vi- sual information

Wang, Zhou

445

78 FR 17418 - Rural Health Information Technology Network Development Grant  

Federal Register 2010, 2011, 2012, 2013, 2014

...Administration Rural Health Information Technology Network Development Grant AGENCY: Health Resources...the Rural Health Information Technology Network Development Grant (RHITND) to Grace...the Rural Health Information Technology Network Development (RHITND) Grant to the...

2013-03-21

446

Three-Party Quantum Network Communication Protocols Based on Quantum Teleportation  

NASA Astrophysics Data System (ADS)

By utilizing the delocalized correlation of entangled states in quantum information theory, a novel method on acknowledgments of quantum information among three-party is presented, and then two three-party quantum network communication protocols based on quantum teleportation are presented, namely, three-party stop-wait quantum communication protocol and three-party selective automatic repeat quantum communication protocol. In the two proposed protocols, the data frames composed of qubits are teleported via three-party quantum teleportation, the two receivers simultaneously receive quantum frames from the sender, and then return quantum acknowledgment frames or quantum negative acknowledgment frames via quantum entanglement channels. The sender simultaneously receives and deals with quantum acknowledgment frames and quantum negative acknowledgment frames from the two receivers, thus the processing delay on returning quantum frames is reduced. And due to the transience of transferring quantum information, the returning of quantum acknowledgment frames and quantum negative acknowledgment frames are completed instantaneously, the proposed protocols reduce the transmission delay and improve the communication efficiency. During the whole course of communications, the classical channels are only used to transmit the measurement message, so the burdens of classical channels are reduced.

Zhou, Nan-Run; Cheng, Hu-Lai; Gong, Li-Hua; Li, Chi-Sheng

2014-04-01

447

ECE 333: Introduction to Communication Networks Lecture 2: Network Architectures  

E-print Network

,... Processor --- Control unit, arithmetic unit, I/O unit,... Arithmetic unit --- Adders, accumulators, ... 4 Layer 2 Layer 2 Packet pipe #12;7 Notes: Slide 1: By "network architecture", we mean a global view

Berry, Randall

448

A Mathematical Model of the Effects of Internal Group Pressures, of Group Communication, and of Out-Group Communication on Attitude Change in Human Communication Networks.  

ERIC Educational Resources Information Center

A mathematical model that describes attitude change in human communication networks is developed in this paper. The parameters of the model are drawn from a review of the literature related to network analysis, small group influence, mass communication, and attitude change. The literature review identifies key variables that influence attitude

Johnson, J. David

449

Communicating oscillatory networks: Frequency Domain Analysis  

E-print Network

in the stochastic model. We specu- late that this is due to the system being neutrally stable at this point and the stochastic noise re-ignites the oscilla- tory behaviour. The corresponding frequency spectra (Figure 3A, right panel) are shown on a logarithmic... negative influence on spe- cies B when B is consumed in a reaction and A is either an enzyme or substrate in the same reaction: the more A that exists, the more B is consumed. Using this network abstraction we evaluated the correlation between the dis...

Ihekwaba, Adaoha E C; Sedwards, Sean

2011-12-22

450

Information theory, animal communication, and the search for extraterrestrial intelligence  

NASA Astrophysics Data System (ADS)

We present ongoing research in the application of information theory to animal communication systems with the goal of developing additional detectors and estimators for possible extraterrestrial intelligent signals. Regardless of the species, for intelligence (i.e., complex knowledge) to be transmitted certain rules of information theory must still be obeyed. We demonstrate some preliminary results of applying information theory to socially complex marine mammal species (bottlenose dolphins and humpback whales) as well as arboreal squirrel monkeys, because they almost exclusively rely on vocal signals for their communications, producing signals which can be readily characterized by signal analysis. Metrics such as Zipf's Law and higher-order information-entropic structure are emerging as indicators of the communicative complexity characteristic of an "intelligent message" content within these animals' signals, perhaps not surprising given these species' social complexity. In addition to human languages, for comparison we also apply these metrics to pulsar signalsperhaps (arguably) the most "organized" of stellar systemsas an example of astrophysical systems that would have to be distinguished from an extraterrestrial intelligence message by such information theoretic filters. We also look at a message transmitted from Earth (Arecibo Observatory) that contains a lot of meaning but little information in the mathematical sense we define it here. We conclude that the study of non-human communication systems on our own planet can make a valuable contribution to the detection of extraterrestrial intelligence by providing quantitative general measures of communicative complexity. Studying the complex communication systems of other intelligent species on our own planet may also be one of the best ways to deprovincialize our thinking about extraterrestrial communication systems in general.

Doyle, Laurance R.; McCowan, Brenda; Johnston, Simon; Hanser, Sean F.

2011-02-01

451

Adaptive swarm-based routing in communication networks.  

PubMed

Swarm intelligence inspired by the social behavior of ants boasts a number of attractive features, including adaptation, robustness and distributed, decentralized nature, which are well suited for routing in modern communication networks. This paper describes an adaptive swarm-based routing algorithm that increases convergence speed, reduces routing instabilities and oscillations by using a novel variation of reinforcement learning and a technique called momentum. Experiment on the dynamic network showed that adaptive swarm-based routing learns the optimum routing in terms of convergence speed and average packet latency. PMID:15495316

Lu, Yong; Zhao, Guang-Zhou; Su, Fan-Jun; Li, Xiao-Run

2004-07-01

452

Multiply-agile encryption in high speed communication networks  

SciTech Connect

Different applications have different security requirements for data privacy, data integrity, and authentication. Encryption is one technique that addresses these requirements. Encryption hardware, designed for use in high-speed communications networks, can satisfy a wide variety of security requirements if that hardware is key-agile, robustness-agile and algorithm-agile. Hence, multiply-agile encryption provides enhanced solutions to the secrecy, interoperability and quality of service issues in high-speed networks. This paper defines these three types of agile encryption. Next, implementation issues are discussed. While single-algorithm, key-agile encryptors exist, robustness-agile and algorithm-agile encryptors are still research topics.

Pierson, L.G. [Sandia National Labs., Albuquerque, NM (United States); Witzke, E.L. [RE/SPEC Inc., Albuquerque, NM (United States)

1997-05-01

453

ECS: Efficient Communication Scheduling for Underwater Sensor Networks  

PubMed Central

TDMA protocols have attracted a lot of attention for underwater acoustic sensor networks (UWSNs), because of the unique characteristics of acoustic signal propagation such as great energy consumption in transmission, long propagation delay and long communication range. Previous TDMA protocols all allocated transmission time to nodes based on discrete time slots. This paper proposes an efficient continuous time scheduling TDMA protocol (ECS) for UWSNs, including the continuous time based and sender oriented conflict analysis model, the transmission moment allocation algorithm and the distributed topology maintenance algorithm. Simulation results confirm that ECS improves network throughput by 20% on average, compared to existing MAC protocols. PMID:22163775

Hong, Lu; Hong, Feng; Guo, Zhongwen; Li, Zhengbao

2011-01-01

454

Center for Networked Information Discovery and Retrieval  

NSDL National Science Digital Library

The prototype AIDS patent library is a system designed by MCNC's Clearinghouse for Networked Information Discovery and Retrieval (CNIDR) for the U.S. Patent and Trademark Office (PTO) and will serve as a model for storing and disseminating government and other public documents in the future. The system uses CNIDR-developed information retrieval software and supports direct access to patents through a variety of popular network information services such as Z39.50, World Wide Web and electronic mail.

1994-01-01

455

Destination-directed, packet-switched architecture for a geostationary communications satellite network  

NASA Technical Reports Server (NTRS)

A major goal of the Digital Systems Technology Branch at the NASA Lewis Research Center is to identify and develop critical digital components and technologies that either enable new commercial missions or significantly enhance the performance, cost efficiency, and/or reliability of existing and planned space communications systems. NASA envisions a need for low-data-rate, interactive, direct-to-the-user communications services for data, voice, facsimile, and video conferencing. The network would provide enhanced very-small-aperture terminal (VSAT) communications services and be capable of handling data rates of 64 kbps through 2.048 Mbps in 64-kbps increments. Efforts have concentrated heavily on the space segment; however, the ground segment has been considered concurrently to ensure cost efficiency and realistic operational constraints. The focus of current space segment developments is a flexible, high-throughput, fault-tolerant onboard information-switching processor (ISP) for a geostationary satellite communications network. The Digital Systems Technology Branch is investigating both circuit and packet architectures for the ISP. Destination-directed, packet-switched architectures for geostationary communications satellites are addressed.

Ivancic, William D.; Shalkhauser, Mary JO; Bobinsky, Eric A.; Soni, Nitin J.; Quintana, Jorge A.; Kim, Heechul; Wager, Paul; Vanderaar, Mark

1993-01-01

456

Passing crisis and emergency risk communications: The effects of communication channel, information type, and repetition.  

PubMed

Three experiments explore several factors which influence information transmission when warning messages are passed from person to person. In Experiment 1, messages were passed down chains of participants using five different modes of communication. Written communication channels resulted in more accurate message transmission than verbal. In addition, some elements of the message endured further down the chain than others. Experiment 2 largely replicated these effects and also demonstrated that simple repetition of a message eliminated differences between written and spoken communication. In a final field experiment, chains of participants passed information however they wanted to, with the proviso that half of the chains could not use telephones. Here, the lack of ability to use a telephone did not affect accuracy, but did slow down the speed of transmission from the recipient of the message to the last person in the chain. Implications of the findings for crisis and emergency risk communication are discussed. PMID:25683552

Edworthy, Judy; Hellier, Elizabeth; Newbold, Lex; Titchener, Kirsteen

2015-05-01

457

Program Support Communications Network (PSCN) facsimile system directory  

NASA Technical Reports Server (NTRS)

This directory provides a system description, a station listing, and operating procedures for the Program Support Communications Network (PSCN) NASA Facsimile System. The NASA Facsimile System is a convenient and efficient means of spanning the distance, time, and cost of transmitting documents from one person to another. In the spectrum of communication techniques, facsimile bridges the gap between mail and data transmission. Facsimile can transmit in a matter of minutes or seconds what would take a day or more by mail delivery. The NASA Facsimile System is composed of several makes and models of facsimile machines. The system also supports the 3M FaxXchange network controllers located at Marshall Space Flight Center (MSFC).

1992-01-01

458

Modeling and Analysis of Mobility Management in Mobile Communication Networks  

PubMed Central

Many strategies have been proposed to reduce the mobility management cost in mobile communication networks. This paper studies the zone-based registration methods that have been adopted by most mobile communication networks. We focus on two special zone-based registration methods, called two-zone registration (2Z) and two-zone registration with implicit registration by outgoing calls (2Zi). We provide a new mathematical model to analyze the exact performance of 2Z and 2Zi. We also present various numerical results, to compare the performance of 2Zi with those of 2Z and one-zone registration (1Z), and show that 2Zi is superior to 2Z as well as 1Z in most cases. PMID:24883368

Yoon, Ji Hyun; Kim, Chesoong

2014-01-01

459

Testbed for the evaluation of battlefield information management techniques applied to a low-bandwidth tactical wireless communications environment  

NASA Astrophysics Data System (ADS)

Mobile communication is an important military requirement. Voice communication still occupy a pre-eminent place in Army operations. Present-generation digital data communications at the tactical level are often accomplished using radio system designed primarily with voice in mind. Data throughput tends to be very limited and highly variable. If one regards the wireless communication network as a data pipeline, there are essentially three possible ways of improving the situation: (1) increase the size of the pipeline; (2) optimize transmission through the pipeline; or (3) be as smart and efficient as possible about what is put into the pipeline. The potential of the third approach is often overlooked. This paper describes a testbed being developed to study the impact of information management techniques, applied at the level of the application database in each participating node of a simulated tactical radio network on the quality and timeliness of information distribution across nodes.

Gibb, Allan W.; St-Jacques, Jean-Claude

1999-07-01

460

Aviation Weather Information Communications Study (AWIN). Phase 1 and 2  

NASA Technical Reports Server (NTRS)

This two part study examines the communication requirements to provide weather information in the cockpit as well as public and private communication systems available to address the requirements. Ongoing research projects combined with user needs for weather related information are used to identify and describe potential weather products that address decision support in three time frames: Far-Term Strategic, Near-Term Strategic and Tactical. Data requirements of these future products are identified and quantified. Communications systems and technologies available in the public as well as private sector are analyzed to identify potential solutions. Recommendations for further research identify cost, performance, and safety benefits to justify the investment. The study concludes that not all weather information has the same level of urgency to safety-of-flight and some information is more critical to one category of flight than another. Specific weather products need to be matched with communication systems with appropriate levels of reliability to support the criticality of the information. Available bandwidth for highly critical information should be preserved and dedicated to safety. Meanwhile, systems designed for in-flight-entertainment and other passenger/crew services could be used to support less critical information that is used only for planning and economic decision support.

Ball, J. W.; Herron, R. G.; Nozawa, E. T.; Thomas, E. A.; Witchey, R. D.

2000-01-01

461

Visual Communications for Heterogeneous Networks/Visually Optimized Scalable Image Compression. Final Report for September 1, 1995 - February 28, 2002  

SciTech Connect

The authors developed image and video compression algorithms that provide scalability, reconstructibility, and network adaptivity, and developed compression and quantization strategies that are visually optimal at all bit rates. The goal of this research is to enable reliable ''universal access'' to visual communications over the National Information Infrastructure (NII). All users, regardless of their individual network connection bandwidths, qualities-of-service, or terminal capabilities, should have the ability to access still images, video clips, and multimedia information services, and to use interactive visual communications services. To do so requires special capabilities for image and video compression algorithms: scalability, reconstructibility, and network adaptivity. Scalability allows an information service to provide visual information at many rates, without requiring additional compression or storage after the stream has been compressed the first time. Reconstructibility allows reliable visual communications over an imperfect network. Network adaptivity permits real-time modification of compression parameters to adjust to changing network conditions. Furthermore, to optimize the efficiency of the compression algorithms, they should be visually optimal, where each bit expended reduces the visual distortion. Visual optimality is achieved through first extensive experimentation to quantify human sensitivity to supra-threshold compression artifacts and then incorporation of these experimental results into quantization strategies and compression algorithms.

Hemami, S. S.

2003-06-03

462

Technology developments integrating a space network communications testbed  

NASA Technical Reports Server (NTRS)

As future manned and robotic space explorations missions involve more complex systems, it is essential to verify, validate, and optimize such systems through simulation and emulation in a low cost testbed environment. The goal of such a testbed is to perform detailed testing of advanced space and ground communications networks, technologies, and client applications that are essential for future space exploration missions. We describe the development of new technologies enhancing our Multi-mission Advanced Communications Hybrid Environment for Test and Evaluation (MACHETE) that enables its integration in a distributed space communications testbed. MACHETE combines orbital modeling, link analysis, and protocol and service modeling to quantify system performance based on comprehensive considerations of different aspects of space missions.

Kwong, Winston; Jennings, Esther; Clare, Loren; Leang, Dee

2006-01-01

463

A reputation-based anonymous communication strategy in overlay networks  

Microsoft Academic Search

In order to degrade the self participants in the peer-to-peer overlay networks, a rerouting-based anonymous communication strategy respect with reputation mechanism, which does not need an administrating node, is put forward in this paper. The degree of anonymity of the inactive participant is degraded by the value of reputation, and the active participants achieve better degree of anonymity in the

Yanhui Wu; Sichun Wang

2010-01-01

464

Energy efficient communication protocol for wireless sensor networks  

Microsoft Academic Search

Abstract Wireless distributed microsensor systems will enable the reliable monitoring of a variety of environments,for both civil and military applications. In this paper, we look at communication protocols, which can have signicant im- pact on the overall energy dissipation of these networks. Based on our ndings,that the conventional protocols of direct transmission, minimum-transmission-energy, multi- hop routing, and static clustering may

W. Rabiner Heinzelman; A. Chandrakasan; H. Balakrish-nan

2000-01-01

465

Communications of the Association for Information Systems  

E-print Network

Report: Open Access Publishing to Nurture the Sprouts of Knowledge and the Future of Information Systems to Nurture the Sprouts of Knowledge and the Future of Information Systems Research Michel Avital, Bo with a working prototype of an Open Access disciplinary repository entitled Sprouts (http://sprouts

Crowston, Kevin

466

Gigabit Satellite Network for NASA's Advanced Communication Technology Satellite (ACTS)  

NASA Technical Reports Server (NTRS)

The advanced communication technology satellite (ACTS) gigabit satellite network provides long-haul point-to-point and point-to-multipoint full-duplex SONET services over NASA's ACTS. at rates up to 622 Mbit/s (SONET OC-12), with signal quality comparable to that obtained with terrestrial fiber networks. Data multiplexing over the satellite is accomplished using time-division multiple access (TDMA) techniques coordinated with the switching and beam hopping facilities provided by ACTS. Transmissions through the satellite are protected with Reed-Solomon encoding. providing virtually error-free transmission under most weather conditions. Unique to the system are a TDMA frame structure and satellite synchronization mechanism that allow: (a) very efficient utilization of the satellite capacity: (b) over-the-satellite dosed-loop synchronization of the network in configurations with up to 64 ground stations: and (c) ground station initial acquisition without collisions with existing signalling or data traffic. The user interfaces are compatible with SONET standards, performing the function of conventional SONET multiplexers and. as such. can be: readily integrated with standard SONET fiber-based terrestrial networks. Management of the network is based upon the simple network management protocol (SNMP). and includes an over-the-satellite signalling network and backup terrestrial internet (IP-based) connectivity. A description of the ground stations is also included.

Hoder, Douglas; Bergamo, Marcos

1996-01-01

467

Theoretical and methodological approaches to the study of information need in the context of the impact of new information and communications technologies on the communication of parliamentary information  

Microsoft Academic Search

This paper discusses critically the theoretical and methodological background to an Economic and Social Research Council (ESRC) research project designed to investigate the impact of information and communications technologies (ICTs) on the communication of parliamentary and legislative information to the general public or citizen. It sets out the context of the study in terms of the changes in governance, resulting

Rita Marcella; Graeme Baxter; Nick Moore

2002-01-01

468

COMMUNICATING SCIENCE TO THE YOUNG -FUTURE NETWORKS ECFUN SYMPOSIUM VIENNA, JAN 31ST  

E-print Network

COMMUNICATING SCIENCE TO THE YOUNG - FUTURE NETWORKS ECFUN SYMPOSIUM ­ VIENNA, JAN 31ST ­ FEB 2ND understand science? An analysis of models for communicating science to the young." ­ Ulrike Felt, Head globally" #12;COMMUNICATING SCIENCE TO THE YOUNG - FUTURE NETWORKS ECFUN SYMPOSIUM ­ VIENNA, JAN 31ST ­ FEB

Brückl, Ewald

469

Topology Control for Fault-Tolerant Communication in Wireless Ad Hoc Networks  

E-print Network

Topology Control for Fault-Tolerant Communication in Wireless Ad Hoc Networks Bernd Thallner Paths, Fault-Tolerant Communication 1. Introduction During recent years, wireless multi-hop networks control. By select- ing the particular neighbors a node may directly communicate with, topology control

470

Eavesdropping and communication networks revealed through playback and an acoustic location system  

Microsoft Academic Search

Our understanding of animal communication is expanding from a dyadic framework of one signaler and one receiver to a broader communication network model, yet empirical studies of communication networks are scarce. To investigate whether territorial males eavesdrop on interactions occurring outside of their territory boundaries and to quantify the neighborhood-level effects of song contests, we simulated diurnal dyadic countersinging exchanges

Lauren P. Fitzsimmons; Jennifer R. Foote; Laurene M. Ratcliffe; Daniel J. Mennill

2008-01-01

471

The Role of Communication Practices in the Strengthening of Counter Networks: Case  

E-print Network

and communication technology (ICT) within the primary health care (PHC) sector of Mozambique. The theoretical lens countries. C 2005Wiley Periodicals, Inc. Keywords: counter networks; communication practices; primary healthThe Role of Communication Practices in the Strengthening of Counter Networks: Case Experiences From

Sahay, Sundeep

472

A Real-Time Communication Framework for Wireless Sensor-Actuator Networks  

E-print Network

1 A Real-Time Communication Framework for Wireless Sensor-Actuator Networks Abstract--Wireless sensor-actuator network (WSAN) comprises of a group of distributed sensors and actuators that communicate, and communication capabilities responsible for observing the physical world. On the other hand, actuators

Ngai, Edith Cheuk-Han

473

Remote Network Monitoring Management Information Base for High Capacity Networks  

Microsoft Academic Search

This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in TCP\\/IP-based internets. In particular, it defines objects for managing remote network monitoring (RMON) devices for use on high speed networks. This document contains a MIB Module that defines these new objects and also contains definitions of some updated objects from the RMON-MIB

S. Waldbusser

2002-01-01

474

The World Information Network on Biodiversity  

NSDL National Science Digital Library

The World Information Network on Biodiversity (REMIB) is organized and provided by Mexico's National Commission for the Knowledge and Use of the Biodiversity. REMIB is a network of shared biological information databases from research centers in Mexico, the US, Costa Rica, and Spain. The databases contain "curatorial, taxonomic, ecological, cartographic, bibliographic, ethno-biological type, use of catalogues on natural resources and other subject matters." Currently, REMIB gathers information on taxonomic groups of plants, as well as terrestrial and aquatic vertebrates, and invertebrates. The network contains information on over 6 million specimens from over 200 countries, and will be soon be incorporating collections from additional sources, such as the Smithsonian Institution and the Kew Herbarium. Users must first click on Access to the Information and accept the conditions for data use before reaching the network's search engine. The main page includes links to the home pages of partner institutions.

1969-12-31

475

Efficient data communication techniques for controller area network (CAN) protocol  

Microsoft Academic Search

Summary form only given. Single bus based distributed embedded systems are used in several real time control applications such as automobiles, aircraft, industrial automation, off-road vehicles etc. The single bus based multiplexing network allows information sharing among various intelligent modules inside a microcontroller based multimaster system. In order to achieve an optimum functionality, the information should be exchanged among various

S. Misbahuddin; N. Al-Holou

2003-01-01

476

Information theoretical assessment of visual communication with wavelet coding  

NASA Astrophysics Data System (ADS)

A visual communication channel can be characterized by the efficiency with which it conveys information, and the quality of the images restored from the transmitted data. Efficient data representation requires the use of constraints of the visual communication channel. Our information theoretic analysis combines the design of the wavelet compression algorithm with the design of the visual communication channel. Shannon's communication theory, Wiener's restoration filter, and the critical design factors of image gathering and display are combined to provide metrics for measuring the efficiency of data transmission, and for quantitatively assessing the visual quality of the restored image. These metrics are: a) the mutual information (Eta) between the radiance the radiance field and the restored image, and b) the efficiency of the channel which can be roughly measured by as the ratio (Eta) /H, where H is the average number of bits being used to transmit the data. Huck, et al. (Journal of Visual Communication and Image Representation, Vol. 4, No. 2, 1993) have shown that channels desinged to maximize (Eta) , also maximize. Our assessment provides a framework for designing channels which provide the highest possible visual quality for a given amount of data under the critical design limitations of the image gathering and display devices. Results show that a trade-off exists between the maximum realizable information of the channel and its efficiency: an increase in one leads to a decrease in the other. The final selection of which of these quantities to maximize is, of course, application dependent.

Rahman, Zia-ur

1995-06-01

477

Fault-tolerant onboard digital information switching and routing for communications satellites  

NASA Technical Reports Server (NTRS)

The NASA Lewis Research Center is developing an information-switching processor for future meshed very-small-aperture terminal (VSAT) communications satellites. The information-switching processor will switch and route baseband user data onboard the VSAT satellite to connect thousands of Earth terminals. Fault tolerance is a critical issue in developing information-switching processor circuitry that will provide and maintain reliable communications services. In parallel with the conceptual development of the meshed VSAT satellite network architecture, NASA designed and built a simple test bed for developing and demonstrating baseband switch architectures and fault-tolerance techniques. The meshed VSAT architecture and the switching demonstration test bed are described, and the initial switching architecture and the fault-tolerance techniques that were developed and tested are discussed.

Shalkhauser, Mary JO; Quintana, Jorge A.; Soni, Nitin J.; Kim, Heechul

1993-01-01

478

Disclosure Control of Natural Language Information to Enable Secure and Enjoyable Communication over the Internet  

NASA Astrophysics Data System (ADS)

Disclosure control of natural language information (DCNL), which we are trying to realize, is described. DCNL will be used for securing human communications over the internet, such as through blogs and social network services. Before sentences in the communications are disclosed, they are checked by DCNL and any phrases that could reveal sensitive information are transformed or omitted so that they are no longer revealing. DCNL checks not only phrases that directly represent sensitive information but also those that indirectly suggest it. Combinations of phrases are also checked. DCNL automatically learns the knowledge of sensitive phrases and the suggestive relations between phrases by using co-occurrence analysis and Web retrieval. The users' burden is therefore minimized, i.e., they do not need to define many disclosure control rules. DCNL complements the traditional access control in the fields where reliability needs to be balanced with enjoyment and objects classes for the access control cannot be predefined.

Kataoka, Haruno; Utsumi, Akira; Hirose, Yuki; Yoshiura, Hiroshi

479

Data Gathering in Networks of Bacteria Colonies: Collective Sensing and Relaying Using Molecular Communication  

E-print Network

The prospect of new biological and industrial applications that require communication in micro-scale, encourages research on the design of bio-compatible communication networks using networking primitives already available in nature. One of the most promising candidates for constructing such networks is to adapt and engineer specific types of bacteria that are capable of sensing, actuation, and above all, communication with each other. In this paper, we describe a new architecture for networks of bacteria to form a data collecting network, as in traditional sensor networks. The key to this architecture is the fact that the node in the network itself is a bacterial colony; as an individual bacterium (biological agent) is a tiny unreliable element with limited capabilities. We describe such a network under two different scenarios. We study the data gathering (sensing and multihop communication) scenario as in sensor networks followed by the consensus problem in a multi-node network. We will explain as to how th...

Einolghozati, Arash; Beirami, Ahmad; Fekri, Faramarz

2012-01-01

480

Network Infusion to Infer Information Sources in Networks  

E-print Network

Several models exist for diffusion of signals across biological, social, or engineered networks. However, the inverse problem of identifying the source of such propagated information appears more difficult even in the ...

Feizi, Soheil

2014-12-02

481

The Teen Health Information Network (THINK).  

ERIC Educational Resources Information Center

Discusses the Teen Health Information Network (THINK), a grant-funded partnership of Aurora, Illinois, public libraries, schools, and community agencies to provide materials, information, and programming on issues related to teen health. Seven appendixes provide detailed information on survey results, collection evaluation and development,

Kuzel, Judith; Erickson, Su

1995-01-01

482

The next frontier for communications networks: power management  

NASA Astrophysics Data System (ADS)

Performance evaluation is used to gain an understanding of how to make the best use of scarce resources. Storage, memory, processing, and communications bandwidth are all relatively plentiful and inexpensive. What is the next frontier for communications networks and performance evaluation? I will argue that it is power management to achieve cost-effective operation. In the past few years, entirely new network protocols have been developed for battery-hungry sensor networks. But, what about the existing Internet? Estimates place the Internet as consuming from 2% to 8% of the total electricity produced in the USA - much of this power consumption is unnecessary. Do our "always on" desktop computers really need to be fully powered-up all the time? What can be done to achieve power-savings in these computers? The goal is to eliminate unnecessary energy usage by desktop computers in the near future and by networked embedded systems in the longer term. Traffic characterization is the first step towards this goal. Traffic characterization at inter-flow, intra-flow, and protocol levels is being done to investigate power management. The resulting savings achievable from relatively simple power management schemes are measured in TWh per year - or roughly equivalent to the electricity generated by one nuclear power plant. This is cost-effectiveness on a large scale!

Christensen, Kenneth J.

2003-08-01

483

Optimizing the interaction of children with information and communication technologies.  

PubMed

This paper outlines the major changes in the lives of children in industrially advanced countries associated with the increased interaction with information and communication technologies. The potential opportunities and threats to the cognitive, social, physical and visual development of children are reviewed to emphasize the importance of optimizing the interaction. The change in children's use of technology also poses opportunities and threats for ergonomics that should be noted if the profession is to continue being relevant and useful into this century. The paper ends with a pathway to the development and implementation of guidelines about child information and communication technology use for different groups of guideline users. PMID:16040523

Straker, L; Pollock, C

2005-04-15

484

Participatory sensing platform to revive communication network in post-disaster scenario  

Microsoft Academic Search

Disaster responses are severely hindered due to the destruction or non-availability of the communication network. This research work proposes mobile adhoc network architecture integrated with participatory sensing concepts, for reviving the communication network in disaster hit areas. The development of such an architecture requires a new routing methodology to cater to the challenging environment. This paper proposes a design that

Maneesha V. Ramesh; Anoop Jacob

2012-01-01

485

GGOS Working Group on Ground Networks and Communications  

NASA Astrophysics Data System (ADS)

Properly designed and structured ground-based geodetic networks materialize the reference systems to support sub-mm global change measurements over space, time and evolving technologies. Over this past year, the Ground Networks and Communications Working Group (GN&C WG) has been organized under the Global Geodetic Observing System (GGOS) to work with the IAG measurement services (the IGS, ILRS, IVS, IDS and IGFS) to develop a strategy for building, integrating, and maintaining the fundamental network of instruments and sup-porting infrastructure in a sustainable way to sat-isfy the long-term (10-20 year) requirements identified by the GGOS Science Council. Activities of this Working Group include the investigation of the status quo and the develop-ment of a plan for full network integration to sup-port improvements in terrestrial reference frame establishment and maintenance, Earth orientation and gravity field monitoring, precision orbit de-termination, and other geodetic and gravimetric applications required for the long-term observa-tion of global change. This integration process includes the development of a network of funda-mental stations with as many co-located tech-niques as possible, with precisely determined intersystem vectors. This network would exploit the strengths of each technique and minimize the weaknesses where possible.

Pearlman, M.; Altamimi, Z.; Beck, N.; Forsberg, R.; Gurtner, W.; Kenyon, S.; Behrend, D.; Lemoine, F. G.; Ma, C.; Noll, C. E.; Pavlis, E. C.; Malkin, Z.; Moore, A. W.; Webb, F. H.; Neilan, R. E.; Ries, J. C.; Rothacher, M.; Willis, P.

486

75 FR 4389 - Notice of Public Information Collection Being Reviewed by the Federal Communications Commission...  

Federal Register 2010, 2011, 2012, 2013, 2014

...COMMISSION Notice of Public Information Collection Being Reviewed by the Federal Communications Commission, Comments...SUMMARY: The Federal Communications Commission, as part...comment on the following information collection(s...forms of information technology; and (e) ways...

2010-01-27

487

The Deep Space Network: A Radio Communications Instrument for Deep Space Exploration  

NASA Technical Reports Server (NTRS)

The primary purpose of the Deep Space Network (DSN) is to serve as a communications instrument for deep space exploration, providing communications between the spacecraft and the ground facilities. The uplink communications channel provides instructions or commands to the spacecraft. The downlink communications channel provides command verification and spacecraft engineering and science instrument payload data.

Renzetti, N. A.; Stelzried, C. T.; Noreen, G. K.; Slobin, S. D.; Petty, S. M.; Trowbridge, D. L.; Donnelly, H.; Kinman, P. W.; Armstrong, J. W.; Burow, N. A.

1983-01-01

488

Performance Limitations of a Free-Space Optical Communication Satellite Network Owing to Vibrations: Heterodyne Detection  

Microsoft Academic Search

Free-space optical communication between satellites in a distributed network can permit high data rates of communication between different places on Earth. To establish optical communication between any two satellites requires that the line of sight of their optics be aligned during the entire communication time. Because of the large distance between the satellites and the alignment accuracy required, the pointing

Shlomi Arnon; Stanley R. Rotman; Norman S. Kopeika

1998-01-01

489

Long-distance quantum communication over noisy networks without long-time quantum memory  

E-print Network

The problem of sharing entanglement over large distances is crucial for implementations of quantum cryptography. A possible scheme for long-distance entanglement sharing and quantum communication exploits networks whose nodes share Einstein-Podolsky-Rosen (EPR) pairs. In Perseguers et al. [Phys. Rev. A 78, 062324 (2008)] the authors put forward an important isomorphism between storing quantum information in a dimension $D$ and transmission of quantum information in a $D+1$-dimensional network. We show that it is possible to obtain long-distance entanglement in a noisy two-dimensional (2D) network, even when taking into account that encoding and decoding of a state is exposed to an error. For 3D networks we propose a simple encoding and decoding scheme based solely on syndrome measurements on 2D Kitaev topological quantum memory. Our procedure constitutes an alternative scheme of state injection that can be used for universal quantum computation on 2D Kitaev code. It is shown that the encoding scheme is equivalent to teleporting the state, from a specific node into a whole two-dimensional network, through some virtual EPR pair existing within the rest of network qubits. We present an analytic lower bound on fidelity of the encoding and decoding procedure, using as our main tool a modified metric on space-time lattice, deviating from a taxicab metric at the first and the last time slices.

Pawe? Mazurek; Andrzej Grudka; Micha? Horodecki; Pawe? Horodecki; Justyna ?odyga; ?ukasz Pankowski; Anna Przysi??na

2015-01-28

490

Long-distance quantum communication over noisy networks without long-time quantum memory  

NASA Astrophysics Data System (ADS)

The problem of sharing entanglement over large distances is crucial for implementations of quantum cryptography. A possible scheme for long-distance entanglement sharing and quantum communication exploits networks whose nodes share Einstein-Podolsky-Rosen (EPR) pairs. In Perseguers et al. [Phys. Rev. A 78, 062324 (2008), 10.1103/PhysRevA.78.062324] the authors put forward an important isomorphism between storing quantum information in a dimension D and transmission of quantum information in a D +1 -dimensional network. We show that it is possible to obtain long-distance entanglement in a noisy two-dimensional (2D) network, even when taking into account that encoding and decoding of a state is exposed to an error. For 3D networks we propose a simple encoding and decoding scheme based solely on syndrome measurements on 2D Kitaev topological quantum memory. Our procedure constitutes an alternative scheme of state injection that can be used for universal quantum computation on 2D Kitaev code. It is shown that the encoding scheme is equivalent to teleporting the state, from a specific node into a whole two-dimensional network, through some virtual EPR pair existing within the rest of network qubits. We present an analytic lower bound on fidelity of the encoding and decoding procedure, using as our main tool a modified metric on space-time lattice, deviating from a taxicab metric at the first and the last time slices.

Mazurek, Pawe?; Grudka, Andrzej; Horodecki, Micha?; Horodecki, Pawe?; ?odyga, Justyna; Pankowski, ?ukasz; Przysie?na, Anna

2014-12-01

491

Technology and Research Requirements for Combating Human Trafficking: Enhancing Communication, Analysis, Reporting, and Information Sharing  

SciTech Connect

DHS Science & Technology Directorate directed PNNL to conduct an exploratory study on the domain of human trafficking in the Pacific Northwest in order to examine and identify technology and research requirements for enhancing communication, analysis, reporting, and information sharing activities that directly support efforts to track, identify, deter, and prosecute human trafficking including identification of potential national threats from smuggling and trafficking networks. This effort was conducted under the Knowledge Management Technologies Portfolio as part of the Integrated Federal, State, and Local/Regional Information Sharing (RISC) and Collaboration Program.

Kreyling, Sean J.; West, Curtis L.; Olson, Jarrod

2011-03-17

492

Image-based information, communication, and retrieval  

NASA Technical Reports Server (NTRS)

IBIS/VICAR system combines video image processing and information management. Flexible programs require user to supply only parameters specific to particular application. Special-purpose input/output routines transfer image data with reduced memory requirements. New application programs are easily incorporated. Program is written in FORTRAN IV, Assembler, and OS JCL for batch execution and has been implemented on IBM 360.

Bryant, N. A.; Zobrist, A. L.

1980-01-01

493

Groupware: Improving Group Communication and Information Dissemination.  

ERIC Educational Resources Information Center

Faced with increased public expectations and decreased funding, the Hawaii Department of Education chose Lotus Notes groupware technology as an efficient means to support statewide collaboration and information dissemination among 4,200 users in 231 schools. Although initially resistant, respondents to a year-end evaluation of the project in one

Saka, Thomas; Shiigi, Clyde

1996-01-01

494

Middle East Mass Communications: Selected Information Sources  

ERIC Educational Resources Information Center

A brief discussion of bibliographical sources for research on the Middle East is followed by a bibliography of information and research from 1950-1971. The Middle East is defined as that group of countries bounded on the north by Turkey, on the east by Iran, on the south by the Persian Gulf, and on the west by Egypt. (JEG)

Mowlana, Hamid

1977-01-01

495

Information and communication technology needs for distributed communication and coordination during expedition-class spaceflight.  

PubMed

AO-lU. Expedition-class missions are distinct from historical human presence in space in ways that significantly affect information flow and information technology designs for such missions. The centrality of Mission Control in these missions is challenged by the distances, associated communication delays, and durations of expeditions, all of which require crews to have more local resources available to manage on-board situations. The author's current research investigates how ground controllers effectively allocate communications bandwidth, cognitive resources, and knowledge sharing skills during time critical routine and non-routine situations. The research focus is on team-based information and communication technology (ICT) use to provide recommendations for improvements to support adaptive bandwidth allocations and improved sharing of data and knowledge in Mission Control contexts. In order to further improve communication and coordination between controllers and crew, additional ICT support resources will be needed to provide shared context knowledge and dynamic assessment of costs and benefits for accessing local information vs. remote expertise. Crew members will have critical needs to understand the goals, intentions, and situational constraints associated with mission information resources in order to use them most effectively in conditions where ground-based expertise is insufficient or requires more time to access and coordinate than local task demands permit. Results of this research will serve to improve the design and implementation of ICT systems to improve human performance capabilities and system operating tolerances for exploration missions. (Specific research data were not available at the time of publication.) PMID:10993302

Caldwell, B S

2000-09-01

496

Negotiation-Based Protocols for Disseminating Information in Wireless Sensor Networks  

Microsoft Academic Search

In this paper, we present a family of adaptive protocols, called SPIN (Sensor Protocols for Information via Negotiation), that efficiently disseminate information among sensors in an energy-constrained wireless sensor network. Nodes running a SPIN communication protocol name their data using high-level data descriptors, called meta-data. They use meta-data negotiations to eliminate the transmission of redundant data throughout the network. In

Joanna Kulik; Wendi Rabiner Heinzelman; Hari Balakrishnan

2002-01-01

497

Impact of Information and Communication Technology on Information Seeking Behavior of Users in Astronomy and Astrophysics Centers of India: A Survey  

NASA Astrophysics Data System (ADS)

This study is based on a survey designed to determine the Information Seeking Behavior (ISB) of Astronomy and Astrophysics users in India. The main objective of the study is to determine the sources consulted and the general pattern of the information-gathering system of users and the impact of Information and Communication Technology (ICT) on the Astronomy and Astrophysics user's Information Seeking Behavior. It examines various Information and Communication Technology-based resources and methods of access and use. A descriptive sample stratified method has been used and data was collected using a questionnaire as the main tool. The response rate was 72%. Descriptive statistics were also employed and data have been presented in tables and graphs. The study is supported by earlier studies. It shows that Astronomy and Astrophysics users have developed a unique Information Seeking Behavior to carry out their education and research. The vast majority of respondents reported that more information is available from a variety of e-resources. Consequently, they are able to devote more time to seek out relevant information in the current Information and Communication Technology scenario. The study also indicates that respondents use a variety of information resources including e-resources for teaching and research. Books and online databases such as the NASA Astrophysics Data System (ADS) were considered more important as formal sources of information. E-mail and face-to-face communications are used extensively by users as informal sources of information. It also reveals that despite the presence of electronic sources, Astronomy and Astrophysics users are still using printed materials. This study should to help to improve various Information and Communication Technology-based services. It also suggests that GOI should adopt Information and Communication Technology-based Information Centers and Libraries services and recommends a network-based model for Astronomy and Astrophysics users.

Sahu, H. K.; Singh, S. N.

2010-10-01

498

Preliminary Measurement of Communication Rates on the Cray T3D Interprocessor Network  

NASA Technical Reports Server (NTRS)

None given.(from task description): Objectives: test the communication network, determine how communication rates scale with message size, test the effect of contention, show the effect of contention.

Springer, Paul; Peterson, John; Numrich, Robert

1993-01-01

499

Dynamical networks for information processing  

Microsoft Academic Search

Coupled evolution of state and topology of dynamical networks is introduced. Due to a well organized tensor structure, the governing equations are presented in a canonical form, and required attractors as well as their basins can be easily placed and controlled. This new class of dynamical networks can represent phenomenological models for self-organization in physics and biology. Applications of these

Michail Zak

2004-01-01

500

Simulation study of unmanned aerial vehicle communication networks addressing bandwidth disruptions  

NASA Astrophysics Data System (ADS)

To date, Unmanned Aerial Vehicles (UAVs) have been widely used for numerous applications. UAVs can directly connect to ground stations or satellites to transfer data. Multiple UAVs can communicate and cooperate with each other and then construct an ad-hoc network. Multi-UAV systems have the potential to provide reliable and timely services for end users in addition to satellite networks. In this paper, we conduct a simulation study for evaluating the network performance of multi-UAV systems and satellite networks using the ns-2 networking simulation tool. Our simulation results show that UAV communication networks can achieve better network performance than satellite networks and with a lower cost and increased timeliness. We also investigate security resiliency of UAV networks. As a case study, we simulate false data injection attacks against UAV communication networks in ns-2 and demonstrate the impact of false data injection attacks on network performance.

Wei, Sixiao; Ge, Linqiang; Yu, Wei; Chen, Genshe; Pham, Khanh; Blasch, Erik; Shen, Dan; Lu, Chao

2014-06-01