Note: This page contains sample records for the topic animal communication systems from Science.gov.
While these samples are representative of the content of Science.gov,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of Science.gov
to obtain the most current and comprehensive results.
Last update: November 12, 2013.
1

Computer Animation and Communicability in Multimedia System: A Trichotomy Evaluation  

Microsoft Academic Search

We present the results obtained through a heuristic assessment of the 2D and 3D animations in commercial off-line and on line\\u000a multimedia systems. Additionally, a set of quality metrics known as CAC -Computer Animation and Communicability, has been\\u000a established as well as a communicability guideline, which is a guide that can be applied by the communicability expert at\\u000a the moment

Francisco V. Cipolla Ficarra; Miguel Cipolla Ficarra

2

Quantitative tools for comparing animal communication systems: information theory applied to bottlenose dolphin whistle repertoires  

Microsoft Academic Search

Comparative analysis of nonhuman animal communication systems and their complexity, particularly in comparison to human language, has been generally hampered by both a lack of sufficiently extensive data sets and appropriate analytic tools. Information theory measures provide an important quantitative tool for examining and comparing communication systems across species. In this paper we use the original application of information theory,

BRENDA McCOWAN; SEAN F. HANSER; LAURANCE R. DOYLE

1999-01-01

3

Ways Animals Communicate  

ERIC Educational Resources Information Center

|The authors describe a set of upper-elementary activities that focuses on how animals communicate. The activities describe procedures that students working in groups can use to investigate the topic of animal communication. An initial information sheet, resource list, and grading rubric are provided. The lesson plan was field-tested in an…

Curry, Kristen; Sumrall, William J.; Moore, Jerilou; Daniels, Anniece

2008-01-01

4

The Animal Communication Project  

NSDL National Science Digital Library

This streamlined website is very accessible to the lay reader, while it also has enough references to scientific studies to appeal to teachers, researchers, and students of animal communication and biology in general. The site contains the full-text of the (now out-of-print) book, The Language of Animals, in addition to "Research News" and some multimedia features. The type of animal communication this website refers to is not that between animals and humans, but among animals. Visitors with pet dogs or cats might enjoy the section on "Cats and Dogs" that explains how lions communicate, and why the domesticated dog barks, but other members of the dog family, such as wolves and coyotes, do not.

5

Information Theory Applied to Animal Communication Systems and Its Possible Application to SETI  

NASA Astrophysics Data System (ADS)

Information theory, as first introduced by Claude Shannon (Shannon &Weaver 1949) quantitatively evaluates the organizational complexity of communication systems. At the same time George Zipf was examining linguistic structure in a way that was mathematically similar to the components of the Shannon first-order entropy (Zipf 1949). Both Shannon's and Zipf's mathematical procedures have been applied to animal communication and recently have been providing insightful results. The Zipf plot is a useful tool for a first estimate of the characterization of a communication system's complexity (which can later be examined for complex structure at deeper levels using Shannon entropic analysis). In this paper we shall discuss some of the applications and pitfalls of using the Zipf distribution as a preliminary evaluator of the communication complexity of a signaling system.

Hanser, Sean F.; Doyle, Laurance R.; McCowan, Brenda; Jenkins, Jon M.

2004-06-01

6

Simulating Affective Communication with Animated Agents  

Microsoft Academic Search

This paper introduces a model of interaction between users and animated agents as well as inter-agent interaction that supports basic features of affective communication. As essential requirements for animated agents' capability to engage in and exhibit affective communication we motivate reasoning about emotions and emotion expression, personality, and social role awareness. Our implemented, entirely web-based system demonstrates animated agents based

Helmut Prendinger; Mitsuru Ishizuka

2001-01-01

7

Animal Communications Through Seismic Vibrations  

ScienceCinema

Substrate vibration has been important to animals as a channel of communication for millions of years, but our literature on vibration in this context of biologically relevant information is only decades old. The jaw mechanism of the earliest land vertebrates allowed them to perceive substrate vibrations as their heads lay on the ground long before airborne sounds could be heard. Although the exact mechanism of vibration production and the precise nature of the wave produced are not always understood, recent development of affordable instrumentation to detect and measure vibrations has allowed researchers to answer increasingly sophisticated questions about how animals send and receive vibration signals. We now know that vibration provides information used in predator defense, prey detection, recruitment to food, mate choice, intrasexual competition, and maternal/brood social interactions in a variety of insect orders, spiders, crabs, scorpions, chameleons, frogs, golden moles, mole rats, kangaroos rats, wallabies, elephants and bison.

8

Animation-Based Explanation of Basic Data Communication Principles  

Microsoft Academic Search

The complexity of communication systems is high. Hence, the presentation of modern communication methods to undergraduate students is difficult. A graphic presentation, and especially an animation can be much more effective than a bare text. The animations must concentrate on basic methods, be enough abstract, user friendly, aesthetic, and possess some kind of flexibility concerning animated scenarios, speed of presentation,

Drago Hercog

9

Song type matching is an honest early threat signal in a hierarchical animal communication system.  

PubMed

Aggressive encounters between animals often involve significant amounts of signalling before or in lieu of physical fights. When, as is often the case, these apparent threat signals are neither inherently costly nor inherently indicative of fighting ability, we should ask whether they are in fact honest signals, i.e. do they predict that escalation is imminent? While signalling theories have indicated that such 'conventional' threat signals can honestly predict escalation, attempts to gather supporting empirical evidence have mostly failed. For example, recent studies in songbirds of song type matching (replying to an opponent's song with the same song type he has just sung) have failed to confirm that it predicts an eventual attack by the signaller. In the present study of song sparrows (Melospiza melodia), we tested the hypothesis that song type matching is an early threat signal in a hierarchical signalling system. We used an improved model-playback design that simulated an escalating intrusion onto the subject's territory: the simulated opponent first sang in hiding from the boundary before moving to the centre of the territory, where he revealed himself and continued to sing. We found that type matching beginning in the boundary phase and continuing into the escalation phase, or beginning immediately after the escalation, reliably predicted both subsequent escalated signalling (soft songs and wing waves) and subsequent attack on the model, supporting the hypothesis that type matching is a reliable early threat signal. PMID:23378665

Akçay, Ça?lar; Tom, Mari E; Campbell, S Elizabeth; Beecher, Michael D

2013-02-01

10

COMMUNICATION AWARENESS WITH ANIMAL WELFARE CASES  

Microsoft Academic Search

Summary: This session will provide a discussion of how veterinary professionals can effectively communicate with clients when there are concerns about animal abuse and neglect. In particular, we will provide a model for engaging the client in the interview, building and enhancing the relationship, and also effectively communicating about decisions in animal welfare cases. In working with these types of

Chandra Grabill

11

Science 101: How do animals communicate underwater?  

NSDL National Science Digital Library

Well, they often use hand signals, such as the "OK" sign, and sometimes they write on message boards. So much for how SCUBA divers (classified as animals) communicate! Other than the authors' knowledge of sound waves and how they move air and water, along with the fact that whales and dolphins make cool sounds, SCUBA diver communication was about the extent of his understanding of how animals' communicate underwater. So, he did a bit of research and discovered lots of interesting things, which he shares in this month's column.

Robertson, William C.

2008-04-01

12

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 signals—perhaps (arguably) the most "organized" of stellar systems—as 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

13

Clandestine Communication Systems.  

National Technical Information Service (NTIS)

Subversive elements, whether insurgent, terrorist, or criminal, all require a communication system to coordinate and control operations. The development of a clandestine communication system requires special considerations in the development of the nodes ...

J. T. COrley

2001-01-01

14

The IRIDIUM communications system  

Microsoft Academic Search

A description is given of the IRIDIUM communication system, so-called because the system design originally consisted of 77 networked satellites, and the element iridium has the atomic number 77. The goal is to make instant global communications a reality. The system design now consists of 60 satellites, a system control facility, gateways, and subscriber units. Each of these components is

R. J. Leopold; A. Miller

1993-01-01

15

Integrated Communication Systems.  

ERIC Educational Resources Information Center

Describes the Internet-based information system that has provided effective communications and reporting for the upgrade to K-12 schools in Scottsdale, Arizona. The Website and software applications created valuable communications in the construction process and improved reporting on progress. (SLD)

Simpson, Ward

2003-01-01

16

Child's Modes of Communication with the Animal.  

ERIC Educational Resources Information Center

|The paper reviews ways in which animals have been used in a therapeutic way with disturbed persons and suggests that animals may help to reduce anxiety and reestablish the socialization process with autistic children and their parents. An etiological study is described of the verbal and nonverbal behavior of four disturbed children (9-11 years…

Salomon, Anne; Comeau, Judith

17

Communicating Networked Control Systems.  

National Technical Information Service (NTIS)

This report describes research conducted over a twelve month period under support from a multi-university research grant whose focus is the technological foundations of Communicating Networked Control Systems. Coordinated efforts at four participating ins...

J. Baillieul P. R. Kumar P. S. Krishnaprasad R. W. Brockett

2007-01-01

18

Bus Communications Systems.  

National Technical Information Service (NTIS)

The thesis addresses problems associated with the design of computer communications systems which have buses as their basic structure. Three major areas of study are treated. These are the problem of synchronizing the sender and receiver of each transmiss...

R. Chia-Hua Chen

1974-01-01

19

Alert signals enhance animal communication in "noisy" environments.  

PubMed

Environmental noise that reduces the probability that animals will detect communicative signals poses a special challenge for long-range communication. The application of signal-detection theory to animal communication lead to the prediction that signals directed at distant receivers in noisy environments will begin with conspicuous "alerting" components to attract the attention of receivers, before delivery of the information-rich portion of the signal. Whether animals actually adopt this strategy is not clear, despite suggestions that alerts might exist in a variety of taxa. By using a combination of behavioral observations and experimental manipulations with robotic lizard "playbacks," we show that free-living territorial Anolis lizards add an "alert" to visual displays when communicating to distant receivers in situations of poor visibility, and that these introductory alerts in turn enhance signal detection in adverse signaling conditions. Our results show that Anolis lizards are able to evaluate environmental conditions that affect the degradation of long-distance signals and adjust their behavior accordingly. This study demonstrates that free-living animals enhance the efficiency of long-range communication through the modulation of signal design and the facultative addition of an alert. Our findings confirm that alert signals are an important strategy for communicating in "noisy" conditions and suggest a reexamination of the existence of alerts in other animals relying on long-range communication. PMID:19033197

Ord, Terry J; Stamps, Judy A

2008-11-24

20

Animal Communication and Its Cognitive Indications.  

ERIC Educational Resources Information Center

|Various examples of communication in species ranging from bumble bees to dolphins are examined in this paper. Focus is directed to indications of the cognitive ability of each species. The signals of cognition include evidence of: adaptability to a new situation; long term memory; and the property of displacement. Most of the sources reviewed…

McLean, Laura L.

21

Animal Communication and Its Cognitive Indications.  

ERIC Educational Resources Information Center

Various examples of communication in species ranging from bumble bees to dolphins are examined in this paper. Focus is directed to indications of the cognitive ability of each species. The signals of cognition include evidence of: adaptability to a new situation; long term memory; and the property of displacement. Most of the sources reviewed…

McLean, Laura L.

22

Patient communication: a multidisciplinary approach using animated cartoons.  

PubMed

Communication is a major problem in the management of patients. Miscommunication occurs frequently in populations with low reading skills, illiteracy does not completely account for the observed low rates of recall of communicated information. Transmission of the message also plays an important role. Successful strategies to improve communication with patients include the use of videotapes, videotape modeling or cartoon illustrations. Do these products communicate effectively because they overcome illiteracy or because they also transmit a very clear message? Can good transmission of messages overcome illiteracy? In this study, we compared the effectiveness of a printed message about polio vaccinations with the same message converted into a production of animated cartoons using marketing and advertising techniques. The production that resulted from using this strategy showed that in the setting of this study, a well-designed animated cartoon is more effective in delivering a message than the same information provided in written instructional materials. PMID:15150139

Leiner, Marie; Handal, Gilbert; Williams, Darryl

2004-05-17

23

Communication Systems. Laboratory Activities.  

ERIC Educational Resources Information Center

|This communication systems guide provides teachers with learning activities for secondary students. Introductory materials include an instructional planning outline and worksheet, an outline of essential elements, a list of objectives, a course description, and a content outline. The guide contains 32 modules on the following topics: story…

Sutherland, Barbara, Ed.

24

The risk communication challenges of mass animal destruction.  

PubMed

Mass animal destruction strategies present a major risk communication challenge. While mass culling, stamping out, and depopulation may be scientifically and economically justified during emergency response to exotic disease incursions and eradication programmes, their use may be limited in the future due to public concerns over animal welfare, environmental contamination and unintended social consequences. To address this dilemma, official veterinary services must move from unidirectional communications strategies to active engagement of all potentially affected stakeholders. Case studies of recent disease outbreaks demonstrate the critical role that communications play in influencing public reaction to disease management strategies. An evaluation of these case studies provides support for the implementation of risk communication best practices: incorporating risk communications into the policy-development process, conducting pre-event planning, fostering partnerships with the public, collaborating with credible sources, meeting the needs of the media, listening to and addressing public concerns, communicating with compassion and empathy, demonstrating honesty and openness, acknowledging uncertainty and providing messages that give people meaningful things to do. Implementing the risk communication best practices requires veterinary services to move from a more technocratic approach to a participatory model where the potentially affected public play an active role in risk assessment and policy making. PMID:20411519

Hueston, William D

25

Behaviour Computer Animation, Communicability and Education for All  

Microsoft Academic Search

\\u000a We are making a heuristic study to determine the benefits of computer animation to improve communicability in the educational\\u000a processes. A diachronic analysis allows to research the influence of the design of the first animations of the 20th century\\u000a on the current 2D and\\/or 3D characters. We are also examining the existing link between the artistic and technical context\\u000a at

Francisco V. Cipolla Ficarra; Jacqueline Alma; Miguel Cipolla-Ficarra

26

The Timewheel Group Communication System  

Microsoft Academic Search

This paper describes a group communication system called the timewheel group communication system that has been designed for a timed asynchronous distributed system model. The timewheel group communication system consists of three protocols: a clock synchronization, an atomic broadcast protocol, and a group membership protocol. All these protocols have been designed to be fail-aware in the sense that a process

Shivakant Mishra; Christof Fetzer; Flaviu Cristian

2002-01-01

27

Animal: A System for Supporting Multiple Roles in Algorithm Animation  

Microsoft Academic Search

Many algorithm animation tools have been developed over the last years.The users of such tools can be separated into four roles: the original algorithm programmer, devel- opers of the animation tool, visualizers that generate the animation and end users viewing the animation. Most tools focus on providing features for only one or at most two of these roles.The ANIMAL system

GUIDO RO; BERND FREISLEBENw

2002-01-01

28

Insat communication system  

NASA Astrophysics Data System (ADS)

The Insat-1 domestic satellite system has been planned as a cost-effective multipurpose system for providing long distance telecommunications, direct TV broadcasting, to rural areas, and meteorological services, and is due to be operational in early 1982. The system will consist of two body-stabilized satellites in geostationary orbit and 34 earth stations, operating in the 6/4 GHz band for telecommunications. This paper describes the salient features of the Insat system. The domestic telecommunication requirements are presented, and the main characteristics of the spacecraft communication subsystem and earth stations are given. The transmission parameters of the Insat carriers are discussed, and the features of network operation and the control center are examined.

Nayak, U. V.; Matapurkar, K. G.

29

Interactive Communication Systems Modeling Study.  

National Technical Information Service (NTIS)

This report deals with an effort to develop an interactive computer model for analysis and design of digital communications systems. In this report concepts are formulated and described for a Model for Interactive design and Analysis of Communication Syst...

R. W. Moss R. W. Rice D. R. Sentz

1977-01-01

30

Animal breeding systems  

Microsoft Academic Search

The study of breeding systems explores relationships between mating behaviour and parental care. Recent findings have shown that in many birds, fishes, anurans, and insects, females play a more active role than previously thought, by engaging in mate choice, mating with more than one male, and selecting genetic partners separately from social partners. Theoretical advances have improved our understanding of

John D. Reynolds

1996-01-01

31

Mine Multimedia Emergency Communication System  

Microsoft Academic Search

Mine multimedia rescue communication has the paroxysmal of time, uncertainty of place, complicacy of condition and multiformity of information, which has more strict requirements. Mine multimedia rescue communication system adopts an integration of MPEG4, VOIP, TCP\\/IP and self-organizing technology etc. It is carried by the rescue workers, and the system adopts a cooperation method of wireless communication and wire communication

Li Wenfeng; Gao Jie; Bai Peng

2007-01-01

32

Voice communication research evaluation system  

Microsoft Academic Search

Aircraft voice communications may be degraded by a variety of sources such as electrical and\\/or acoustical noise, radio interference, jamming and various other forms of distraction. The Voice Communication Research and Evaluation System, located in the Biodynamics and Bioengineering Division of the Aerospace Medical Research Laboratory, has been developed for the comprehensive analysis and enhancement of operational voice communication. The

R. L. McKinley

1980-01-01

33

Security for Industrial Communication Systems  

Microsoft Academic Search

Modern industrial communication networks are increasingly based on open protocols and platforms that are also used in the office IT and Internet environment. This reuse facilitates development and deployment of highly connected systems, but also makes the communication system vulnerable to electronic attacks. This paper gives an overview of IT security issues in industrial automation systems which are based on

DACFEY DZUNG; MARTIN NAEDELE; THOMAS P. VON HOFF; MARIO CREVATIN

2005-01-01

34

Monitoring system for animal husbandry  

US Patent & Trademark Office Database

A monitoring system (800) is operative for receiving sensor signals and analyzing the sensor signals to identify events or conditions of interest, such as colic, with respect to a monitored animal. The sensors may be animal-borne sensors such as motion related sensors. The system (800) includes a processor (802) operative to identify the conditions of interest based on a stored pattern database (806), threshold tables (808) and heuristic engines (812). Upon identification of a condition of interest, a human expert may be consulted and alerts may be generated as required.

Rugg; Geoffrey B. (Boulder, CO)

2008-02-26

35

Communications in Electronic Textile Systems  

Microsoft Academic Search

Electronic textiles (e-textiles) are emerging as a novel method for constructing electronic systems in wearable and large area applications. This new type of processing system merges textile and electronic technologies. This paper studies the communication requirements between the computing and sensing elements of an e-textile. This communication is studied through the construction of a prototype as well as through modeling

Zahi Nakad; Mark T. Jones; Thomas Martin

2003-01-01

36

Iridium® worldwide personal communication system  

NASA Astrophysics Data System (ADS)

The IRIDIUM system is a personal worldwide communication system designed to support portable, low power subscriber units through the use of a constellation of satellites in low earth polar orbit. The satellites are networked together to form a system which provides continuous line-of-sight communications between the IRIDIUM system and any point within 30 km of the earth's surface. The system architecture and operation are described.

Helm, Jim

1997-01-01

37

INMARSAT communications system: A systems approach  

NASA Astrophysics Data System (ADS)

This study describes the history of satellite communications from its beginning to the current date and explains the major components of satellite communications. It describes the satellite communications technology, and identifies some of its problems such as speech echo, data transmission, and digital network synchronization. It deals with U.S. military and international satellite communications systems, and especially with Inmarsat. It also presents the possible threats for a satellite communications system and discusses how to deal with them. Finally, it introduces some conditions and technical considerations of the Inmarsat system in the Hellenic environment and provides some basic information for choosing a satellite system from an economic point of view.

Fasoulas, Aristides I.

1991-06-01

38

Intersputnik communications systems  

NASA Astrophysics Data System (ADS)

The legal and technical bases for "Intersputnik" were developed within the framework of cooperation among the socialist countries in the sphere of conquering and using outer space for peaceful purposes in the "Intercosmos" program. Its activities are based on respect of sovereignty, noninterference in internal affairs, mutual assistance, and mutual benefit. "Intercosmos" is an open intergovernmental organization in which any state may become a member that recognizes its aims and principles of activity, and undertakes the obligations which ensue from the agreement. Its ruling body is the Council, composed of one individual per number nation. The executive and administrative body is the Directorate. The "Intersputnik" system of communications consists of a space complex and Earth stations. Under lease agreements, Soviet artificial Earth satellites of the "Statsionar" type are used. They are located on a geocentric, circular orbit at points 14 degrees west longitude (Atlantic region) and 53 degrees east longitude (Indian region). The orbit lies in the plane of the equator at an altitude of about 36,000 km from the Earth's surface.

Romantsov, V.

1982-03-01

39

Fiber-optic communication systems  

NASA Astrophysics Data System (ADS)

A comprehensive study of the state-of-the-art fiber-optic communication systems is presented which can be used as both a textbook and a reference monograph. The emphasis is place on a physical understanding of this complex technology, from the most basic concepts to the latest innovations. Engineering aspects of these systems are also briefly considered throughout the text. Topics under consideration include optical fibers; optical sources and transmitters, optical detectors and receivers; coherent lightwave systems; multichannel communications systems; optical amplifiers; and soliton communication systems.

Agrawal, Govind P.

40

Intelligibility of Diver Communication Systems.  

National Technical Information Service (NTIS)

The purposes of the project were (1) to develop a method for evaluating the intelligibility of underwater communication systems and (2) to make comparative evaluations of the systems currently available (both military and civilian). Speech materials consi...

H. Hollien R. F. Coleman C. L. Thompson K. Hunter

1968-01-01

41

Towards multiscale communication systems  

Microsoft Academic Search

Forty years after AT&T's Picturephone, video is still mainly considered as a way to enhance audio communication in an attempt to reproduce face-to-face conditions. In a 1992 paper, Hollan and Stornetta argued that we should develop communication tools that go beyond being there. In this paper, I discuss two different interpretations of their analysis. I then propose the concept of

Nicolas Roussel

2006-01-01

42

Voice communication research evaluation system  

NASA Astrophysics Data System (ADS)

Aircraft voice communications may be degraded by a variety of sources such as electrical and/or acoustical noise, radio interference, jamming and various other forms of distraction. The Voice Communication Research and Evaluation System, located in the Biodynamics and Bioengineering Division of the Aerospace Medical Research Laboratory, has been developed for the comprehensive analysis and enhancement of operational voice communication. The basic system is comprised of a multi-station voice communication network consisting of the USAF standard aircraft intercommunication system, a standard A-19 diluter-demand oxygen regulation system and an on line computer data collection and data analysis system that displays results in real time. The system is housed in a large reverberation chamber containing a programmable sound source capable of reproducing the spectrum and level of any AF operational noise environment. Standardized voice communication effectiveness test materials are used to assess the performance of any aspect of the total voice communication link, however, emphasis is usually placed upon the performance of the aircrew members. This paper will descibe the salient features of this unique system and provide examples of its application to voice communication problems.

McKinley, R. L.

1980-05-01

43

Communication, Work Systems and HRD  

ERIC Educational Resources Information Center

|Purpose: The purpose of this article is to show the foundational place that communication theory and its practice occupies in functioning work systems. Design/methodology/approach: This paper defines the word communication in terms of the creation and interpretation of displays, describes what it means to have a theoretical foundation for a…

Pace, R. Wayne

2013-01-01

44

Smart communications system (SMARTCOMMS)  

Microsoft Academic Search

A small, 15.2 cm (6 in) diameter autonomous vehicle is under development at the Naval Undersea Warfare Center in Newport, Rhode Island. The objective of the vehicle is to complete an underwater fiber optic communications link. As an expendable device, low cost is a primary consideration. This factor in turn leads to numerous potential dual-use applications

T. A. Frank; A. L. Sheridan

1994-01-01

45

Animal production systems in the industrialised world  

Microsoft Academic Search

Summary The production of food from animal origin is relatively stable in the industrialised world. However, animal production systems are changing dramatically with respect to location, herd size and specialisation. Increased pressure from a critical public is moving animal-based production towards systems such as organic production and loose-housing systems which allow the animals to better express normal behaviour. The focus

J. T. Sørensen; S. Edwards; J. Noordhuizen; S. Gunnarsson

2006-01-01

46

33 CFR 127.111 - Communications systems.  

Code of Federal Regulations, 2013 CFR

...Liquefied Natural Gas § 127.111 Communications systems. (a) The marine transfer...LNG must have a ship-to-shore communication system and a separate emergency ship-to-shore communication system. (b) Each...

2013-07-01

47

Interactive Communication Systems Modeling Study.  

National Technical Information Service (NTIS)

This interim report deals with the initial activities under an effort to develop an interactive computer model for analysis and design of digital communications systems. In this report concepts are formulated and described for a model for Interactive Desi...

R. W. Moss J. L. Hammond E. E. Donaldson

1976-01-01

48

Communication and Information Systems Infrastructure.  

ERIC Educational Resources Information Center

Provides a conceptualization of a communication and information system's infrastructure in order to help campus leaders plan more effectively. Discusses its elements, creating access to information, infrastructure maturity, infrastructure assessment, and technology planning for higher education. (EV)

Maughan, George R.

2001-01-01

49

Frequency-Hopping Communication Systems.  

National Technical Information Service (NTIS)

This report presents a current review and analysis of the most important aspects of frequency-hopping communication systems. Frequency synthesis and other implementation issues are discussed. The effects and suitability of various modulations is examined....

D. Torrieri

2003-01-01

50

Trustable Communication Between Mathematics Systems  

Microsoft Academic Search

This paper presents a rigorous, unified framework for facilitating com- munication between mathematics systems. A mathematics system is given one or more interfaces which oer deductive and computational services to other mathematics systems. To achieve communication be- tween systems, a client interface is linked to a server interface by an asymmetric connection consisting of a pair of translations. Answers to

Jacques Carette; William M. Farmer; Jeremie Wajs

2003-01-01

51

The evolving defense communications system  

NASA Astrophysics Data System (ADS)

Command, control, and communications (C3) systems 'help lift the fog of war that adds uncertainty to any military operation.' They multiply the effectiveness of weapon systems and are critical components of our nation's warfighting capability. One of these critical systems is the Defense Communications System (DCS) which evolved over the past 30 years. Several factors drove this evolution, including constrained budgets, the need to improve the effectiveness and efficiency of the service provided, compatibility and interoperability, and technological advances. Based on lessons learned from Desert Shield/Desert Storm and the changing environment, force structure, and strategy, it is time to advance the DCS to its next stage. The future DCS must be flexible enough to adapt to any situation anywhere in the world. Mobile, modular building block packages of communications equipment must be available to provide effective communications capability to deployed units immediately upon arrival. Total integration and interoperability among military, commercial, and other government agencies' communication systems is a must if survivable, robust connectivity is going to be available when needed. Integration planning must begin now.

Testa, Ann M.; Jones, Walter I.

1992-05-01

52

Patient Communication: A Multidisciplinary Approach Using Animated Cartoons  

ERIC Educational Resources Information Center

|Communication is a major problem in the management of patients. Miscommunication occurs frequently in populations with low reading skills, illiteracy does not completely account for the observed low rates of recall of communicated information. Transmission of the message also plays an important role. Successful strategies to improve communication

Leiner, Marie; Handal, Gilbert; Williams, Darryl

2004-01-01

53

Patient Communication: A Multidisciplinary Approach Using Animated Cartoons  

ERIC Educational Resources Information Center

Communication is a major problem in the management of patients. Miscommunication occurs frequently in populations with low reading skills, illiteracy does not completely account for the observed low rates of recall of communicated information. Transmission of the message also plays an important role. Successful strategies to improve communication

Leiner, Marie; Handal, Gilbert; Williams, Darryl

2004-01-01

54

Designing communication activation system in group communication  

Microsoft Academic Search

Our community is facing serious problem: aging society. The population of elderly people is now increasing in Japan. Especially over 75 years old people is estimated to be up to 20 million in 2030. We have investigated in one day care centers which are facilities for elderly care. And we realized that communication is needed for its own sake in

Yoichi Matsuyama; H. Taniyama; Shinya Fujie; Tetsunori Kobayashi

2008-01-01

55

Time reversal communication system  

SciTech Connect

A system of transmitting a signal through a channel medium comprises digitizing the signal, time-reversing the digitized signal, and transmitting the signal through the channel medium. The channel medium may be air, earth, water, tissue, metal, and/or non-metal.

Candy, James V. (Danville, CA); Meyer, Alan W. (Danville, CA)

2008-12-02

56

Senior citizen communication system  

US Patent & Trademark Office Database

A system and method is disclosed whereby a patient at a senior care facility can send and receive messages via the inter-net. Tools are provided to manage the patients, the patient's relative contact, mail and photo collection. Relatives can be designated to suggest changes to the contacts and edit the contents of the patient's contacts files. The messages may be audio, video or text and the user friendly system helps the patients navigate through the process. Notification is provided so that the relatives and patients know when a message had been received. Further notification is provided if a prolonged period lapses after receipt of a message to a patient and the message has not been read.

2010-05-25

57

Coherent OCDMA communication systems  

NASA Astrophysics Data System (ADS)

Coherent optical code division multiple access (OCDMA) technique, where encoding and decoding are based on the phase and amplitude of optical field instead of its intensity, is receiving much attention for the overall superior performance over incoherent OCDMA and the development of compact and reliable en/decoders (E/D) such as spatial light phase modulator (SLPM), superstructured fiber Bragg grating (SSFBG) and multi-port array waveguide grating (AWG)-type E/D. In this paper, we will discuss several recent progresses in coherent OCDMA: a. Novel coding technology such as multi-phase-level SSFBG encoder, 50x50 multiport en/decoder and reconfigurable time domain spectral phase en/decoding; b. New signal modulation formats in OCDMA including DPSK, DQPSK, CSK and M-ary CSK; and c. Field trials of high capacity WDM/OCDMA systems.

Wang, Xu

2012-01-01

58

New system improves diver communications  

SciTech Connect

Utilizing a microprocessor-based speech unscrambler, and acoustic through-water transmission, a communication system introduced in the North Sea allows a diver to talk directly with the surface and other divers free of vulnerable, inhibiting cable links. Advantages include full mobility for divers. Key to the system is a single silicon chip microprocessor housed in a 300 by 60-mm tube for belt mounting.

Baggoft, M.

1982-08-01

59

ToonFace: A System for Creating and Animating Interactive Cartoon Faces  

Microsoft Academic Search

The majority of facial animation work has focused on realistic rendering, often with complex underlying models of muscles and sometimes of facial tissue. A system for facial animation is described that takes a simpler, more artistic aproach. A face animated in this system is an effective vehicle for emotional and communicative expression. The scheme emplyed divides the face into seven

60

Animal Behavior & Communication. Animal Life in Action[TM]. Schlessinger Science Library. [Videotape].  

ERIC Educational Resources Information Center

|This 23-minute videotape for grades 5-8, presents the myriad of animal life that exists on the planet. Students can view and perform experiments and investigations that help explain animal traits and habits. The way an animal acts or behaves helps it get what it needs to survive. Students find out why some animal behaviors are instinctive while…

2000

61

Animal communication: reading lizards' body language in context.  

PubMed

A recent study has shown that Jacky lizards adjust their movement-based visual signaling in response to the varying environmental conditions; the results indicate that this species has highly sophisticated communication and sensory processing strategies. PMID:17878050

Zanker, Johannes M

2007-09-18

62

wildCENSE: GPS based animal tracking system  

Microsoft Academic Search

wildCENSE is a Wireless Sensor Network (WSN) system which attempts to monitor the behaviour and migration patterns of Barasingha (Swamp Deer). The system would collect the micro-climatic as well as positional information of the animal and communicate it to a base station through flooding of data using peer-to-peer network. The base station, using a gateway, will upload all the collected

V. R. Jain; R. Bagree; A. Kumar; P. Ranjan

2008-01-01

63

Interactive Communication Systems Simulation Model (ICSSM) Extension.  

National Technical Information Service (NTIS)

The Interactive Communication System Simulation Model (ICSSM), developed for the Rome Air Development Center, is capable of simulating a point-to-point communication system including its functional elements, components, propagation effects, and transmissi...

I. Gerry M. Mammone W. D. Wade

1983-01-01

64

PERSONAL NETWORKS AND THE PERSONAL COMMUNICATION SYSTEM  

Microsoft Academic Search

In contrast to technologically deterministic approaches that focus on how communication technology affects social relationships, this paper examines how individuals draw on a variety of commonly used communication media in conjunction with in-person contact to stay connected to their personal networks. I term this use of multiple communication media the ‘personal communication system’. Findings are based on a random sample

Jeffrey Boase

2008-01-01

65

Research and implementation of multimedia communication systems  

Microsoft Academic Search

Because of the special nature of communications systems, designing and developing a simple and targeted multimedia communications platform is the focus of this work. The main features of the platform are applying the existing messaging middleware technology to the system in order to meet the messaging needs communication system, extending the message middleware, adding configurable signaling and encryption Function, providing

Yang Xi; Xue Fei

2011-01-01

66

The Appraisal of Organizational Communication Systems.  

ERIC Educational Resources Information Center

|The purpose of this paper is to present a practical model for maintenance of organizational communication systems through the use of effective appraisal systems. The paper includes a detailed definition of organizational communication, an identification of the components of a communication appraisal system appropriate to such definition, a…

Greenbaum, Howard H.

67

Communications Systems for Mobile Robotics  

SciTech Connect

Performance Confirmation is the activity by which the Yucca Mountain Project confirms that the engineered and natural containment barriers of this national nuclear waste repository are performing as predicted, so that an eventual decision to close the repository can be made. This activity involves systems that must be inspected and, in some cases, serviced by mobile robots. This paper discusses systems for underground mobile robot communications, including requirements, environments, options, issues, and down-select criteria. We reviewed a variety of systems, including Slotted Waveguide, Powerline Carrier, Leaky Feeder, Photonic Bandgap Fiber, Free-Space Optics, Millimeter Waves, Terahertz Systems, and RF Systems (including IEEE 802.11 a,b, and g, and Ultra-Wideband radio).

Futterman, J A; Pao, H

2003-12-08

68

Pheromones and Animal Behaviour: Communication by Smell and Taste by Tristram D. Wyatt  

Microsoft Academic Search

Tristram D. Wyatt's scholarly text intricately details ubiquitous chemical communication among animals from a diverse range of species. The Asian ele- phant shares a component of its female sex pheromone with140 species of moth. Thus, evolutionary theory provides the backdrop for an interdisciplinary approach to chemical communication that includes information from neurobiological, hor- monal, behavioral and ecological research. The book's

James V. Kohl

69

Practice and communications systems: a word processor based communications system.  

PubMed

The majority of computerized systems currently available for the orthodontic office have been designed for and aimed at those offices that have a volume practice and frequently have multiple practitioners. The stand-alone practitioner and the small office have been grossly ignored. Systems designed for large practices are frequently too complex, too involved in business administration, and too costly for the small office to use effectively. This article describes how an office communications system can be assembled by using commercially available programs. For background information and definition of terms used in this article, I suggest referring to "An Introduction to the Computerization of the Orthodontic Practice," in the Oct. issue of this Journal. PMID:1456238

Abelson, M N

1992-12-01

70

Animal communication: sniffing is about more than just smell.  

PubMed

A recent study shows that subordinate rats reduce their rate of sniffing while dominants explore their faces thus delaying dominants' subsequent aggression. Sniffing not only facilitates acquisition of olfactory information, but unexpectedly, also serves as a medium for communication. PMID:23578872

Galef, Bennett G

2013-04-01

71

Towards a Distributed Crisis Response Communication System  

Microsoft Academic Search

Reliable communication systems are one of the key success factors for a successful first response mission. Current crisis response communication systems suffer from damaged or destroyed infrastructure or are just overstressed in the case of a large scale disaster. We provide an outline for a distributed communication approach, which fulfills the requirements of first responders. It is based on a

Dirk Bradler; TU Darmstadt; Benjamin Schiller; Erwin Aitenbichler; Nicolas Liebau

72

Communication delays in wide area measurement systems  

Microsoft Academic Search

This paper provides a tutorial introduction to phasor measurement units (PMU) when applied in a power system environment, provides an overview of communication alternatives for wide area measurement systems (WAMS), and computes the delay budget for each type of communication link. The goal of this study is to provide data regarding the communication delay that can be incorporated into the

Biju Naduvathuparambil; Matthew C. Valenti; Ali Feliachi

2002-01-01

73

Communications satellite system for Africa  

NASA Astrophysics Data System (ADS)

Earlier established requirement estimations were improved upon by contacting African administrations and organizations. An enormous demand is shown to exist for telephony and teletype services in rural areas. It is shown that educational television broadcasting should be realized in the current African transport and communications decade (1978-1987). Radio broadcasting is proposed in order to overcome illiteracy and to improve educational levels. The technical and commercial feasibility of the system is provided by computer simulations which demonstrate how the required objectives can be fulfilled in conjunction with ground networks.

Kriegl, W.; Laufenberg, W.

1980-09-01

74

SEAFARER: Extremely Low Frequency Naval Communications System.  

National Technical Information Service (NTIS)

Ballistic missile submarines (SSBNs) and nuclear attack submarines (SSNs) cannot perform all of their missions effectively under current communications limitations. Existing communications systems require these submarines to approach the surface and deplo...

E. J. Gannon

1978-01-01

75

How plant–animal interactions signal new insights in communication  

Microsoft Academic Search

Fundamental concepts about the diversity and evolution of signals have been developed mainly in the context of sexual selection. Here, we review the functional ecology of signals in a different context, that of plant-animal interactions. The visual signals of fruits and flowers are relatively constant and clear in the message that they convey. Thus, plant signals present a particularly suitable,

H. Martin Schaefer; Veronika Schaefer; Douglas J. Levey

2004-01-01

76

Animal and\\/as Medium: Symbolic Work in Communicative Regimes  

Microsoft Academic Search

This paper addresses the widespread imagery of animals in contemporary media culture. Focusing on advertising for cell phones, it suggests that dogs and monkeys mediating between phones and users carry pedagogical messages that work across and underneath the surfaces of corporate advertising. Images from this well orchestrated campaign reveal a shift in how technologies are marketed to youths. Analyzing first

Jody Berland

2009-01-01

77

Animal communication: ideas derived from Tiribergen’s activities  

Microsoft Academic Search

When I was a new research student in the late 1960s, four things struck me about Niko Tinbergen. The first was the breadth\\u000a of his approach. I personally benefited greatly from this because I wanted to study a problem in population ecology and I\\u000a ended up in his Animal Behaviour Group. Niko quite rightly saw no real distinction between the

John R. Krebs

78

Redefining animal signaling: influence versus information in communication  

Microsoft Academic Search

Researchers typically define animal signaling as morphology or behavior specialized for transmitting encoded information from a signaler to a perceiver. Although intuitively appealing, this conception is inherently metaphorical and leaves concepts\\u000a of both information and encoding undefined. To justify relying on the information construct, theorists often appeal to Shannon\\u000a and Weaver’s quantitative definition. The two approaches are, however, fundamentally at

Michael J. OwrenDrew; Drew Rendall; Michael J. Ryan

2010-01-01

79

Optimal communication logics in networked control systems  

Microsoft Academic Search

This paper addresses the control of spatially distributed processes over a network that imposes bandwidth constraints and communication delays. Optimal communication policies are derived for an estimator-based networked control system architecture to reduce the communication load. These policies arise as solutions of an average cost optimization problem, which is solved using dynamic programming. The optimal policies are shown to be

Yonggang Xu; J. P. Hespanha

2004-01-01

80

Disaster Tolerant Computer and Communication Systems  

Microsoft Academic Search

Disaster Tolerance is the characteristic attributed to a system that can withstand a catastrophic failure and still function with some degree of normality. Disaster tolerance of computer and communication systems is described and methods for modeling this form of system robustness are described. Definitions and descriptions of disaster tolerant computing and communications systems are provided and related to more familiar

Stephen A. SZYGENDA; Mitchell A. THORNTON

81

Expert Systems as Tools for Technical Communicators.  

ERIC Educational Resources Information Center

Discusses expertise, what an expert system is, what an expert system shell is, what expert systems can and cannot do, knowledge engineering and technical communicators, and planning and managing expert system projects. (SR)

Grider, Daryl A.

1994-01-01

82

49 CFR 193.2519 - Communication systems.  

Code of Federal Regulations, 2012 CFR

...AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION (CONTINUED) PIPELINE SAFETY LIQUEFIED NATURAL GAS FACILITIES: FEDERAL SAFETY STANDARDS Operations § 193.2519 Communication systems. (a) Each LNG...

2012-10-01

83

Project Management Communication: a Systems Approach  

Microsoft Academic Search

This discussion analyzes and reviews verbal and non-verbal communication issues that have an impact on information resource project managers. The concepts are presented in a familiar information systems model framework showing open and closed-loop systems as well as a communication flow system. It provides theoretical underpinnings for project managers who strive to develop proactive management of the environmental influences surrounding

Sharlett Gillard; Jane Johansen

2004-01-01

84

Communication architecture of an early warning system  

NASA Astrophysics Data System (ADS)

This article discusses aspects of communication architecture for early warning systems (EWS) in general and gives details of the specific communication architecture of an early warning system against tsunamis. While its sensors are the "eyes and ears" of a warning system and enable the system to sense physical effects, its communication links and terminals are its "nerves and mouth" which transport measurements and estimates within the system and eventually warnings towards the affected population. Designing the communication architecture of an EWS against tsunamis is particularly challenging. Its sensors are typically very heterogeneous and spread several thousand kilometers apart. They are often located in remote areas and belong to different organizations. Similarly, the geographic spread of the potentially affected population is wide. Moreover, a failure to deliver a warning has fatal consequences. Yet, the communication infrastructure is likely to be affected by the disaster itself. Based on an analysis of the criticality, vulnerability and availability of communication means, we describe the design and implementation of a communication system that employs both terrestrial and satellite communication links. We believe that many of the issues we encountered during our work in the GITEWS project (German Indonesian Tsunami Early Warning System, Rudloff et al., 2009) on the design and implementation communication architecture are also relevant for other types of warning systems. With this article, we intend to share our insights and lessons learned.

Angermann, M.; Guenther, M.; Wendlandt, K.

2010-11-01

85

How do communication systems emerge?  

PubMed

Communication involves a pair of behaviours--a signal and a response--that are functionally interdependent. Consequently, the emergence of communication involves a chicken-and-egg problem: if signals and responses are dependent on one another, then how does such a relationship emerge in the first place? The empirical literature suggests two solutions to this problem: ritualization and sensory manipulation; and instances of ritualization appear to be more common. However, it is not clear from a theoretical perspective why this should be the case, nor if there are any other routes to communication. Here, we develop an analytical model to examine how communication can emerge. We show that: (i) a state of non-interaction is evolutionarily stable, and so communication will not necessarily emerge even when it is in both parties' interest; (ii) the conditions for sensory manipulation are more stringent than for ritualization, and hence ritualization is likely to be more common; and (iii) communication can arise by a third route, when the intention to communicate can itself be communicated, but this may be limited to humans. More generally, our results demonstrate the utility of a functional approach to communication. PMID:22217724

Scott-Phillips, Thomas C; Blythe, Richard A; Gardner, Andy; West, Stuart A

2012-01-04

86

How do communication systems emerge?  

PubMed Central

Communication involves a pair of behaviours—a signal and a response—that are functionally interdependent. Consequently, the emergence of communication involves a chicken-and-egg problem: if signals and responses are dependent on one another, then how does such a relationship emerge in the first place? The empirical literature suggests two solutions to this problem: ritualization and sensory manipulation; and instances of ritualization appear to be more common. However, it is not clear from a theoretical perspective why this should be the case, nor if there are any other routes to communication. Here, we develop an analytical model to examine how communication can emerge. We show that: (i) a state of non-interaction is evolutionarily stable, and so communication will not necessarily emerge even when it is in both parties' interest; (ii) the conditions for sensory manipulation are more stringent than for ritualization, and hence ritualization is likely to be more common; and (iii) communication can arise by a third route, when the intention to communicate can itself be communicated, but this may be limited to humans. More generally, our results demonstrate the utility of a functional approach to communication.

Scott-Phillips, Thomas C.; Blythe, Richard A.; Gardner, Andy; West, Stuart A.

2012-01-01

87

System Models of Information, Communication and Mass Communication: Revaluation of Some Basic Concepts of Communication.  

ERIC Educational Resources Information Center

|A more unified approach to communication theory can evolve through systems modeling of information theory, communication modes, and mass media operations. Such systematic analysis proposes, as is the case care here, that information models be based upon combinations of energy changes and exchanges and changes in receiver systems. The mass media…

Wiio, Osmo A.

88

Animal-inspired human-robot interaction: a robotic tail for communicating state  

Microsoft Academic Search

We present a robotic tail interface for enabling a robot to communicate its state to people. Our interface design follows an animal-inspired methodology where we map the robot's state to its tail output, leveraging people's existing knowledge of and experiences with animals for human-robot interaction. In this paper we detail our robotic-tail design approach and our prototype implementations, and outline

Ashish Singh; James E. Young

2012-01-01

89

Communications Interface Driver (CID) System User's Manual.  

National Technical Information Service (NTIS)

This user's manual for the Communications Interface Driver (CID) systems is used to describe the operating procedures of the CID. The CID system is a test tool intended to supply or receive a capacity level of communications messages to and from the air t...

T. Bratton C. Dudas M. Schoenthal J. Davis A. Leone

1989-01-01

90

Communications track for systems engineering majors  

Microsoft Academic Search

The Weapons and Systems Engineering Department at the United States Naval Academy offers an undergraduate degree in Systems Engineering (Controls) to approximately 100 midshipmen annually. Fourth year students are allowed to specialize by taking a two-course track chosen from several areas of interest. Our communications track is one of these areas. The communication track integrates signal analysis and processing methods,

Svetlana Avramov-Zamurovic; Carl Wick; Terry Dwan

1998-01-01

91

The Spread Wide Area Group Communication System  

Microsoft Academic Search

Building a wide area group communication system is a challenge. This paper presents the design and pro tocols of the Spread wide area group communication system. Spread integrates two low-level protocols: one for lo cal area networks called Ring, and one for the wide area net work connecting them, called Hop. Spread decouples the dissemination and local reliability mechanisms from

Yair Amir; Jonathan Stanton

1998-01-01

92

An Overview of SDMA in Communications Systems  

Microsoft Academic Search

Space Division Multiple Access (SDMA) is a technology that permits the increase of capacity and performance of communications systems. In this paper, the main characteristics, advantages, disadvantages and the effects of the use of SDMA on a communication system are showed. Additionally an overview of smart antenna technology is given.

Iclia Villordo-Jimenez; Ignacio E. Zaldivar-Huerta; G. M. Galvan-Tejada

2006-01-01

93

The Roles of Animated Pedagogical Agents' Presence and Nonverbal Communication in Multimedia Learning Environments  

Microsoft Academic Search

We examined how the presence and nonverbal communication of an animated pedagogical agent affects students’ perceptions and learning. College students learned about astronomy either without an agent’s image or with an agent under one of the following conditions: a static agent (S), an agent with deictic movements (D), an agent with facial expressions (E), or an agent with both deictic

Casey Frechette; Roxana Moreno

2010-01-01

94

Simple models to assist in communicating key principles of animal disease control  

Microsoft Academic Search

Summary Aggressive actions for disease eradication, including animal disposal, can have serious impacts on the livestock industry, environment and public confidence. Coordinated efforts are required for effective, efficient and acceptable disease control and eradication. The authors summarise concepts from previous publications into a group of simple examples, schematic diagrams and basic equations. These simplified models may be used to communicate

W. Bruce McNab; Caroline Dubé

95

Adaptive Antenna Arrays for Coded Communications Systems.  

National Technical Information Service (NTIS)

An adaptive antenna array suitable for rejecting undesired signals in a coded, digital communication system is described. The signal received by each array element is adjusted in amplitude and phase by an adaptive, feedback-control system designed to mini...

K. L. Reinhard

1974-01-01

96

Communication Theory of Quantum Systems.  

National Technical Information Service (NTIS)

The primary concern in this research is with communication theory problems incorporating quantum effects for optical-frequency applications. Under suitable conditions, a unique quantum channel model corresponding to a given calssical space-time varying li...

H. P. H. Yuen

1971-01-01

97

Learning Communication for Multi-agent Systems  

Microsoft Academic Search

We analyze a general model of multi-agent communication in which all agents communicate simultaneously to a message board. A ge- netic algorithm is used to learn multi-agent languages for the predator agents in a version of the predator-prey problem. The resulting evolved behavior of the communicating multi-agent system is equivalent to that of a Mealy machine whose states are determined

C. Lee Giles; Kam-chuen Jim

2002-01-01

98

Collaborative Networked Communication: MUDs as Systems Tools  

Microsoft Academic Search

A systems administration group is only as effective as its internal communication mechanisms. On-line communication has traditionally been managed via electronic mail or news, which are neither real-time nor truly collaborative. Communication tools which let multiple parties work together in real-time have become widespread on the Internet in the last several years. In an effort to keep a physically disjoint

Rémy Evard

1993-01-01

99

Non-verbal Communication System Using Pictograms  

Microsoft Academic Search

A system is described that uses pictograms to support interactive non-verbal communication. While pictograms are typically\\u000a used with objects, this system uses them for events as well. Moreover, whereas communication systems using pictograms are\\u000a generally designed for people with disabilities, this system is designed for people in general. It can thus be used between\\u000a a non-disabled person and a person

Makiko Okita; Yuki Nakaura; Hidetsugu Suto

2009-01-01

100

TS-Animation: A Track-Based Sketching Animation System  

Microsoft Academic Search

Computer has been widely used in classroom. Yet most of them can only provide static slides in the project mode, which are\\u000a not attractive to children, especially to the younger ones. On contrast animations are not only attractive but also expressive.\\u000a Using some animations in classroom makes the children more active and enhances their learning efficiency. However, most of\\u000a current

Guangyu Wu; Danli Wang; Guozhong Dai

2008-01-01

101

PEDRO: A hybrid small animal imaging system  

Microsoft Academic Search

The pixelated emission detector for radioisotopes (PEDRO) is a hybrid emission imaging system designed for the measurement of single photon emission from small animals. The PEDRO is based on the combination of mechanical and electronic collimation (through the Compton effect). It utilizes a Compton-camera stack geometry situated behind an aperture array to modulate the incident radiation. The geometry is intended

J. J. C. Brown; M. R. Dimmock; J. E. Gillam; M. Jones; R. A. Lewis; A. Lynch; G. Panjkovic; C. Hall

2009-01-01

102

Dependent Failures in Data Communication Systems  

Microsoft Academic Search

Although almost all published analyses of the reliability of communication systems assume failures of different lines are independent, such failures are actually highly correlated. A description of why this is true is given. This is followed by an approximate theoretical analysis of some measurement data. Both approaches yield the inescapable conclusion that assuming failures of different communications lines serving one

J. Spragins

1977-01-01

103

ISS Update: High Rate Communications System  

NASA Video Gallery

ISS Update Commentator Pat Ryan interviews Diego Serna, Communications and Tracking Officer, about the High Rate Communications System. Questions? Ask us on Twitter @NASA_Johnson and include the hashtag #askStation. For the latest news about the space station, visit http://www.nasa.gov/station.

Mark Garcia

2012-03-27

104

The Roles of Mental Animations and External Animations in Understanding Mechanical Systems  

Microsoft Academic Search

The effects of computer animations and mental animation on people's mental mod- els of a mechanical system are examined. In 3 experiments, students learned how a mechanical system works from various instructional treatments including viewing a static diagram of the machine, predicting motion from static diagrams, viewing computer animations, and viewing static and animated diagrams accompanied by verbal commentaries. Although

Mary Hegarty; Sarah Kriz; Christina Cate

2003-01-01

105

Reliability consideration of a mobile communication system with network congestion  

Microsoft Academic Search

High quality traffic for networks is urgently needed for mobile communication systems. Mobile stations frequently become unavailable due to communication errors generated by network congestion. Traffic congestion in a network system may occur intermittently and continue for a length of time, sometimes causing communication errors. If congestions happens during communication, communication errors occur and the communication is rejected. This paper

Mitsutaka Kimura; Kazumi Yasui; Toshio Nakagawa; Naohiro Ishii

2006-01-01

106

Communication mode of distributed multisensor detection system  

Microsoft Academic Search

Distributed Multi-sensor Detection System is a wide field distributed wireless detection system, which is composed of Command Center and varieties of Detection Units. The Command Center acquires a lot of real-time information from the area that has been monitored by means of bi-directional communication between it and each unit. Communication mode that has been adopted in this detection system will

Min Hua; Yingjun Meng; Dongsheng Gu; Ying Liu

2002-01-01

107

Introduction to Picture Archive and Communication Systems  

Microsoft Academic Search

Picture Archive and Communication Systems (PACS) are comprehensive management systems for diagnostic imaging studies that are increasingly used in hospitals and health care systems. It is essential for PACS to be an integrated part of the total hospital electronic information system in order to be maximally effective. The main objective of any new information system in health care is to

Maureen N. Hood; Hugh Scott

2006-01-01

108

Preliminary Thoughts on Netted Cable Communication Systems.  

ERIC Educational Resources Information Center

There are five categories of cable communication systems: Conventional Community Antenna Television (CATV), Pay-TV, Subscriber Response Systems, Electronic Information Handling Systems, and Two-Way Audio/Visual Systems. CATV and Pay-TV systems are designed for the one-way transmission of programs, the former providing for better quality…

Eldridge, Frank; Mason, William

109

Preliminary Thoughts on Netted Cable Communication Systems.  

ERIC Educational Resources Information Center

|There are five categories of cable communication systems: Conventional Community Antenna Television (CATV), Pay-TV, Subscriber Response Systems, Electronic Information Handling Systems, and Two-Way Audio/Visual Systems. CATV and Pay-TV systems are designed for the one-way transmission of programs, the former providing for better quality…

Eldridge, Frank; Mason, William

110

Underground communications and tracking systems update  

SciTech Connect

Today, when it comes to having systems to communicate with track and locate underground coal miners, mining companies have many equipment choices, as a direct response to the USA's 2006 MINER Act and the West Virginia Legislative Rule 56-4-8. Coal Age spoke to several companies about their leaky feeder and purely wireless systems which are either approved by the US MSHA or have been submitted for approval. The article gives details of: a UHF leaky feeder system developed by Pillar Innovations, designed to exit a mine at multiple points and then tie the leads back together on the surface; the Venture/Helicomm MineTrader system for tracking, monitoring and emergency messaging for mines; Rajant Corp.'s BreadCrumb wireless system using battery-powered wireless access nodes that enable voice and data communications across a self-healing network; the SubterraCom Wireless Solution's communications systems; a wireless mesh peer-to-peer communications system and an ultra widebade (UWB)-base real-time location tracking system from L-3 Communications; and VHF and UHF leaky feeder amplifiers from Tunnel Radio. MSHA approved communications and tracking systems are tabulated. 11 photos., 1 tab.

Fiscor, S.

2008-01-15

111

Anima II: a 3-D color animation system  

Microsoft Academic Search

An animation software system has been developed at The Computer Graphics Research Group which allows a person with no computer background to develop an animation idea into a finished color video product which may be seen and recorded in real time. The animation may include complex polyhedra forming words, sentences, plants, animals and other creatures. The animation system, called Anima

Ronald J. Hackathorn

1977-01-01

112

Public perception and risk communication in regard to bioterrorism against animals and plants.  

PubMed

This paper examines the total international prohibition on the use of disease to attack humans, animals and plants, noting that in the past several countries had developed programmes for attacks on animals and plants as well as humans. Current activities undertaken by intergovernmental organisations - the World Health Organization (WHO), Food and Agricultural Organization (FAO) and World Organisation for Animal Health (OIE)--to counter the threat of attacks on humans, animals and plants are examined. Effective countermeasures to deliberate attacks need to be developed in harmony with existing measures to control natural or accidental outbreaks of disease. Finally the paper assesses the risk and the public perception of it, and considers what risk communication is needed and to whom. Clear mandates are needed for the FAO and OIE to be prepared to deal with outbreaks of disease, and with contamination of the food supply chain, whether accidental or intentional. PMID:16796037

Pearson, G S

2006-04-01

113

Bases and Consequences of Systems of Communication.  

National Technical Information Service (NTIS)

A series of studies has been undertaken since 1960 specifically dealing with the bases and consequences of systems of communication. This final report summarizes those studies completed under the following three categories: (A) the study of personal relat...

K. W. Back

1967-01-01

114

Federal Communications Commission Advanced Television System Recommendation  

Microsoft Academic Search

The recently released Federal Communications Commission ATV System Recommendation put forth by the FCC's Advisory Committee on Advanced Television Service is reprinted in its entirety. This report summarizes some very significant tests and highly detailed technological advances

P. A. Rubin

1993-01-01

115

Visual and acoustic communication in non-human animals: a comparison.  

PubMed

The visual and auditory systems are two major sensory modalities employed in communication. Although communication in these two sensory modalities can serve analogous functions and evolve in response to similar selection forces, the two systems also operate under different constraints imposed by the environment and the degree to which these sensory modalities are recruited for non-communication functions. Also, the research traditions in each tend to differ, with studies of mechanisms of acoustic communication tending to take a more reductionist tack often concentrating on single signal parameters, and studies of visual communication tending to be more concerned with multivariate signal arrays in natural environments and higher level processing of such signals. Each research tradition would benefit by being more expansive in its approach. PMID:11022231

Rosenthal, G G; Ryan, M J

2000-09-01

116

Genre Systems: Structuring Interaction through Communicative Norms  

Microsoft Academic Search

In this paper we demonstrate that teams may use genre systems-sequences of interrelated communicative actions-deliberately or habitually, to structure their collaboration. Using data over a seven-month period from three teams' use of a collaborative electronic technology, Team Room, we illustrate that genre systems are a means of structuring six dimensions of communicative interaction: purpose (why), content (what), participants (who\\/m), form

JoAnne Yates; Wanda Orlikowski

2002-01-01

117

Scripting Affective Communication with Life-Like Characters in Web-Based Interaction Systems  

Microsoft Academic Search

In this paper, we discuss scripting tools that aim at facilitating the design of web-based interactions with animated characters capable of afiective communication. Speciflcally, two systems are developed. The SCREAM system is a scripting tool that enables au- thors to create emotionally and socially appropriate responses of animated characters. Content authors may design the mental make-up of a character by

Helmut Prendinger; Sylvain Descamps; Mitsuru Ishizuka

2002-01-01

118

Mobile satellite communications systems - Toward global personal communications  

NASA Astrophysics Data System (ADS)

The constraints imposed by the RF environment are reviewed. An overview of present and planned mobile satellite systems is given. Present systems refer to those already in operation, while planned systems refer to those that have authority to offer the services and have either a satellite in orbit or one being built to support the systems. Future directions for mobile satellite communications systems are discussed. One approach emerging is the use of large satellites, with large antennas, operating at much higher carrier frequencies. A second approach is to use low-earth orbiting (LEO) satellites, in order to reduce the path loss. The LEO approach also results in much smaller propagation delays than those experienced with geostationary satellites.

Lodge, John H.

1991-11-01

119

Unique features of animal mitochondrial translation systems  

PubMed Central

In animal mitochondria, several codons are non-universal and their meanings differ depending on the species. In addition, the tRNA structures that decipher codons are sometimes unusually truncated. These features seem to be related to the shortening of mitochondrial (mt) genomes, which occurred during the evolution of mitochondria. These organelles probably originated from the endosymbiosis of an aerobic eubacterium into an ancestral eukaryote. It is plausible that these events brought about the various characteristic features of animal mt translation systems, such as genetic code variations, unusually truncated tRNA and rRNA structures, unilateral tRNA recognition mechanisms by aminoacyl-tRNA synthetases, elongation factors and ribosomes, and compensation for RNA deficits by enlarged proteins. In this article, we discuss molecular mechanisms for these phenomena. Finally, we describe human mt diseases that are caused by modification defects in mt tRNAs.

Watanabe, Kimitsuna

2010-01-01

120

Security Communication Systems for Nuclear Fixed Site Facilities.  

National Technical Information Service (NTIS)

This report presents a basic discussion of communication techniques and factors relevant to designing communication systems for nuclear fixed site facility security systems. The reader is provided communication fundamentals, design considerations, and spe...

L. C. Howington L. L. Taylor

1980-01-01

121

Facility for the Evaluation of Space Communications and Related Systems.  

National Technical Information Service (NTIS)

NASA Lewis Research Center's Communications Projects Branch has developed a facility for the evaluation of space communications systems and related types of systems, called the Advanced Space Communications (ASC) Laboratory. The ASC Lab includes instrumen...

R. J. Kerczewski J. S. Svoboda B. A. Kachmar

1995-01-01

122

Iterative design of video communication systems  

Microsoft Academic Search

This paper reviews the design and implementation of several video telephony systems at Bellcore as a case study in iterative design. In contrast to single user compuer applications, communication systems consists of both the interconnection technology and the people who are interconnected. From a user’s point of view, the capabilities provided by the system, the rules for its use, and

Colleen Cool; Robert S. Fish; Robert E. Kraut; C. M. Lowery

1992-01-01

123

Communication Research in the Design of Communication Interfaces and Systems.  

ERIC Educational Resources Information Center

Suggests that over the next 20 years the evolution of communication technologies may offer a critical opportunity for researchers to positively shape the channels of mediated human communication. Focuses on communication research's role in new communication media. Sketches out a possible research response: a "human factors approach" to…

Biocca, Frank

1993-01-01

124

Monsanto's computer animal proposal system (CAPS).  

PubMed

Regulations and standards must include the minimum requirements with respect to veterinary care, sanitation, handling, feeding, and housing. Part 1 of the Animal Welfare Act regulations was amended to update, clarify, and expand the list of definitions of terms and standards. Section 9 CFR, Part 1, contains definitions and deals with animal welfare, animal housing, dealers, exhibitors, research facilities, and humane animal handling. The subjects in 9 CFR, Part 2, pertain to licensing, registration, identification of animals, records, institutional animal care and use committees, and adequate veterinary care. Animal welfare, humane animal handling, pets, transportation, and reporting and recordkeeping requirements are the subjects listed in 9 CFR, Part 3. PMID:7804639

Russell, C K; Buckingham, F X; Daniels, R; Bertan, L; Fetty, P; Klein, D

1994-06-01

125

The Roles of Mental Animations and External Animations in Understanding Mechanical Systems  

ERIC Educational Resources Information Center

The effects of computer animations and mental animation on people's mental models of a mechanical system are examined. In 3 experiments, students learned how a mechanical system works from various instructional treatments including viewing a static diagram of the machine, predicting motion from static diagrams, viewing computer animations, and…

Hegarty, Mary; Kriz, Sarah; Cate, Christina

2003-01-01

126

The contribution of applied ethology in judging animal welfare in farm animal housing systems  

Microsoft Academic Search

In 1981, the Swiss animal welfare legislation introduced an authorisation procedure for mass-produced farm animal housing systems. If appropriate, practical tests are carried out to identify animal welfare problems in systems or devices that are proposed by manufacturers. Such tests may include veterinary, physiological and behavioural measurements. We briefly review practical tests of group cages for laying hens, electric cow-trainers

Beat Wechsler; Ernst Fröhlich; Hans Oester; Thomas Oswald; Josef Troxler; Roland Weber; Hans Schmid

1997-01-01

127

A native IP satellite communications system  

NASA Astrophysics Data System (ADS)

? In the framework of ESA's ARTES-5 program the Institute of Applied Systems Technology (Joanneum Research) in cooperation with the Department of Communications and Wave Propagation has developed a novel meshed satellite communications system which is optimised for Internet traffic and applications (L*IP—Local Network Interconnection via Satellite Systems Using the IP Protocol Suite). Both symmetrical and asymmetrical connections are supported. Bandwidth on demand and guaranteed quality of service are key features of the system. A novel multi-frequency TDMA access scheme utilises efficient methods of IP encapsulation. In contrast to other solutions it avoids legacy transport network techniques. While the DVB-RCS standard is based on ATM or MPEG transport cells, the solution of the L*IP system uses variable-length cells which reduces the overhead significantly. A flexible and programmable platform based on Linux machines was chosen to allow the easy implementation and adaptation to different standards. This offers the possibility to apply the system not only to satellite communications, but provides seamless integration with terrestrial fixed broadcast wireless access systems. The platform is also an ideal test-bed for a variety of interactive broadband communications systems. The paper describes the system architecture and the key features of the system.

Koudelka, O.; Schmidt, M.; Ebert, J.; Schlemmer, H.; Kastner-Puschl, S.; Riedler, W.

2004-08-01

128

Animals  

NSDL National Science Digital Library

Explore the wonderful world of animals Listen to the animal sound. See if you can identify the animal.Animal sounds. Explore and find out about different animals.Kids Planet Create a animal report using one of the animals found in the web site.Kids Planet,SeaWorld/animals Create a picture of your animal examples are found...Your big backyard ...

Unsworth, Mrs.

2005-03-31

129

COVICS: A covert video communications system  

NASA Astrophysics Data System (ADS)

A covert video communications system compatible with narrow band satellite use has been developed. The system communications by modulating reflected energy. This means that no energy is actively generated at the passive end of the link. Only the antenna is impedance is modulated to return the information. The recovered signal is then coherently demodulated to recover the information. The system uses microstrip antennas, operates at 10 GHz, and has a range of about 5 km. The video is slow scan and is updated every 2 seconds, and can be sent over a 2400 baud line such as is required for some satellite communications systems. A combination of discrete cosine transform and video differencing was used to achieve a high degree of video compression.

Bracht, Roger; Kuckertz, Tom

130

Telecom 1: French domestic communications satellite system  

NASA Astrophysics Data System (ADS)

Services supplied by TELECOM 1, the components of the TELECOM 1 system, the industrial organization, and the project schedule are described. The TELECOM 1 system: provides broadband digital links between companies in France and neighboring states; routes telephone communications and television broadcasts between France and its overseas territories; and handles government communications. A ground control and monitoring station operates the TDMA system and supervises ground station performance, synchronizes the bursts from each station, surveys the repeaters and provides the billing. Three satellites, including one spare, developed from OTS, MARECS and ECS designs, are launched by Ariane.

1981-05-01

131

Construction of a Communication Audit: An Examination of Communication Systems and Their Effectiveness.  

ERIC Educational Resources Information Center

Abstracts of 12 papers concerning the effectiveness of various communication systems are printed here. Subjects of the papers are: the appraisal of organizational communication systems, and evaluation of ECCO analysis as a communication audit methodology, assessment of attitude and opinion change effects of the communication audit, organizational…

Peterson, Brent D., Ed.; Greenbaum, Howard H., Ed.

132

Establishing Communication Systems without Explicit Meaning Transmission  

Microsoft Academic Search

This paper investigates the development of experience-based meaning creation and explores the problem of establishing successful communication systems in a population of agents. The aim of the work is to investigate how such systems can develop, without reliance on phe- nomena not found in actual human language learning, such as the explicit transmission of meaning or the provision of reliable

Andrew D. M. Smith

2001-01-01

133

The Changing System of Scholarly Communication.  

ERIC Educational Resources Information Center

The purposes of this paper are twofold: to present perceptions held within the research library community about changes taking place in the scholarly communication system and through the presentation of these views to stimulate dialog among the major participants in the system. The paper comprises five major sections. A section on the scholarly…

Association of Research Libraries, Washington, DC.

134

Internet Pajama: A Mobile Hugging Communication System  

Microsoft Academic Search

Internet Pajama is a novel wearable system aimed at pro- moting physical interaction in remote communication be- tween parent and child. This system enables parent and child to hug one another through a novel hugging interface device and a wearable, hug reproducing jacket connected through the Internet. The hugging device is a small, mobile doll with embedded pressure sensing circuit

James Keng; Soon Teh; Adrian David Cheok; Tim Merritt; Roshan Peiris

135

School Planning Evaluation Communication System. Consultant's Manual.  

ERIC Educational Resources Information Center

This manual is intended to assist facilitators helping educational organizations plan and implement the School Planning, Evaluation, and Communication System (SPECS). The first section describes each component of SPECS and includes information about documents and data necessary for implementing the system. Section Two provides actual activities to…

Cole, Barbara, Ed.

136

A Systemic Perspective of Communication and Sexism.  

ERIC Educational Resources Information Center

Communication and sexism are analyzed from a systemic perspective, illustrating how sexism is perpetuated through sexist interaction and symbol systems. Sexism is shown to be a disease in our society, which creates a societal situation with double-binding sex-role symbols which limit our adaptability. A remedy for sexism is suggested which…

Drecksel, Debra

137

A 1000+ Channel Bionic Communication System  

Microsoft Academic Search

The wireless electronic nervous system interface known as the functional electrical stimulation-battery powered bionreg system is being developed at the Alfred Mann Foundation. It contains a real-time propagated wave micro-powered multichannel communication system. This system is designed to send bi-directional messages between an external master controller unit (MCU), and each one of a group of injectable stimulator-sensor battery powered bionreg

Joseph H. Schulman; J. Phil Mobley; James Wolfe; Howard Stover; Adrian Krag

2006-01-01

138

Expert system to design communications circuits  

SciTech Connect

An expert system has been created to aid the design of fiber optic based communications circuits. The design system is based on an Apollo workstation, LISP and CPSL, an in-house developed expert system language. The optical circuit is taken from design specification through hardware selection and circuit routing to the production of detailed schematics and routing guides. A database containing the entire fiber optic trunk system is also maintained.

Tolendino, L.F.; Vahle, M.O.

1986-07-01

139

Optical communication systems and applications in railway transportation systems  

Microsoft Academic Search

In this study, signalling in railway transportation systems are considered and their working mechanism is investigated. The applications and structures of the communications systems in railway transportation industry where high speed communications are essential for safety are assessed, within the framework of the broad band and high data transmission rates of optical fibers due to their operation in THz level.

N. Ozlem Unverdi; N. Aydin Unverdi

2012-01-01

140

Communication in production animal medicine: modelling a complex interaction with the example of dairy herd health medicine  

PubMed Central

Background The importance of communication skills in veterinary medicine is increasingly recognised. Appropriate communication skills towards the client are of utmost importance in both companion animal practice and production animal field and consultancy work. The need for building a relationship with the client, alongside developing a structure for the consultation is widely recognised and applies to both types of veterinary practice. Results Veterinary advisory practice in production animal medicine is, however, characterised by a more complex communication on different levels. While the person-orientated communication is a permanent process between veterinarian and client with a rather personal perspective and defines the roles of interaction, the problem-orientated communication deals with emerging difficulties; the objective is to solve an acute health problem. The solution - orientated communication is a form of communication in which both veterinarian and client address longstanding situations or problems with the objective to improve herd health and subsequently productivity performance. All three forms of communication overlap. Conclusions Based on this model, it appears useful for a veterinary practice to offer both a curative and an advisory service, but to keep these two separated when deemed appropriate. In veterinary education, the strategies and techniques necessary for solution orientated communication should be included in the teaching of communication skills.

2011-01-01

141

Microcells in personal communications systems  

Microsoft Academic Search

Research projects involving fiber-connected microcell base units, measurements and models of propagation in urban microcells, and radio link performance in urban microcells are summarized. Developments in microcell system issues, such as channel assignments and handoff in microcells and architectures for combining microcells with traditional macrocells, are discussed. Research on both indoor radio propagation and wireless indoor systems is reviewed

L. J. Greenstein; N. Amitay; Ta-Shing Chu; G. J. Foschini; M. J. Gans; I. Chih-Lin; R. A. Valenzuela; G. Vannucci

1992-01-01

142

Timing and synchronization for modern communications systems  

NASA Astrophysics Data System (ADS)

An overview is given of the principles of timing and synchronization for modern communications systems. Sources of frequency and time information include quartz, rubidium and cesium oscillators and a disciplined frequency standard that is referenced either to a cesium standard over a communications net or to a time and frequency service such as Loran-C. The Global Positioning System (GPS), not being fully operational, is not described but will provide an excellent source of accurate time and frequency information using 18 satellites with atomic standards onboard. Services available around the world are noted, and characteristics including equipment cost are tabulated.

Porter, J.

143

Optical System in Laser Inter-Satellites Communication  

Microsoft Academic Search

We know that Inter-satellites communication is a very important to us. However, real global coverage can only be achieved by satellite systems. Satellites communication is the most important mean of the communication network. The traditional satellites communication and inter-satellites links are built by microwave. Recent years, laser links for inter-satellites communication are becoming more and more important.

Zhou Li; Wen Chuanhua; Liu Baoming

2008-01-01

144

System for synchronizing synthesizers of communication systems  

Microsoft Academic Search

Frequency synthesizers at first and second stations that communicate with each other via a transmission link having a constant propagation delay time are started and synchronized by transmitting a tone from the first station to the second station via the link. The frequencies derived from the synthesizer at the second station are received at the first station and are combined

E. A. Enriquez; R. E. Gookin

1979-01-01

145

A bidirectional fiber optic communication system  

NASA Astrophysics Data System (ADS)

A novel bidirectional fiber optic communication system has been designed and developed at the Defence Research Establishment Pacific (DREP). It is part of a new magnetic anomaly detection (MAD) system currently under development by the MAD group. The fiber optic system is designed to transfer asynchronous data through a single optical fiber between an aircraft and a tethered bird. Low magnetic content, minimal size and weight, low power consumption, and wide temperature range operation of the bird section of the system are requirements that are critical to the proper functioning of the entire MAD system. The communication system described in this paper meets all of these requirements as well as providing exceptional accuracy and reliability.

Schattschneider, George K.

1991-06-01

146

Dust inhalation system for small laboratory animals.  

PubMed

In order to stabilize the dust concentration for animal inhalation studies, two feedback systems were introduced. Dusts generated were passed through two cyclone separators and stored first in a storage chamber. Then they were aspirated into an ejector by compressed carrier air, mixed with filtered room air in a mixing box, and introduced into an exposure chamber. The first feedback system was for dust generation. Dusts were reaerosolized by on-off control using the output signals from a light-scattering dust detector connected to a storage chamber. The second system was for the control of compressed carrier air flow into an ejector. Compressed air flow was automatically regulated by a PID-controller in combination with a mass flow controller. The PID-controller processed continuous signals from another dust detector connected to an exposure chamber and fed control signals to a mass flow controller for regulation of the compressed air flow. This automatic control system could not only reduce hunchings of dust concentration following on-off control of a dust generator but also reduce overshooting of dust concentration in the exposure chamber following the detachment and dispersion of dusts adhering to the inner walls of the dust-supplying route. The system could also maintain a desired dust concentration in the exposure chamber for up to 180 days (20 hr/day, 7 days/week). In addition, this system could simultaneously introduce different doses of dust to other exposure chambers stably while maintaining similar size distribution of the dusts if additional identical exposure units were used. These results indicate that this dust inhalation system is suitable both for long-term studies and for investigating a dose-response relationship. PMID:8519290

Negishi, T; Nishimura, I

1993-04-01

147

Simple models to assist in communicating key principles of animal disease control.  

PubMed

Aggressive actions for disease eradication, including animal disposal, can have serious impacts on the livestock industry, environment and public confidence. Coordinated efforts are required for effective, efficient and acceptable disease control and eradication. The authors summarise concepts from previous publications into a group of simple examples, schematic diagrams and basic equations. These simplified models may be used to communicate principles of disease control to livestock owners and workers, and to regulatory officials and policy-makers. Such stakeholders may not have time to study more complex models. It is hoped that a broader appreciation of key principles will compel stakeholders to act routinely in a manner that improves the prevention and control of infectious animal diseases. PMID:20411520

McNab, W Bruce; Dubé, Caroline

148

An authorisation procedure for mass-produced farm animal housing systems with regard to animal welfare  

Microsoft Academic Search

In 1981, an authorisation procedure regarding animal welfare was introduced in Switzerland for mass-produced housing systems and equipment for farm animals. When asking for an authorisation, the manufacturer or importer of a housing system or equipment must send detailed documentation (plans, measures, technical data) to the Federal Veterinary Office. The authorisation can only be given if the housing system or

Beat Wechsler

2005-01-01

149

A packet switched communications system for GRO  

NASA Astrophysics Data System (ADS)

This paper describes the packet switched Instrumenters Communication System (ICS) that was developed for the Command Management Facility at GSFC to support the Gamma Ray Observatory (GRO) spacecraft. The GRO ICS serves as a vital science data acquisition link to the GRO scientists to initiate commands for their spacecraft instruments. The system is ready to send and receive messages at any time, 24 hours a day and seven days a week. The system is based on X.25 and the International Standard Organization's (ISO) 7-layer Open Systems Interconnection (OSI) protocol model and has client and server components. The components of the GRO ICS are discussed along with how the Communications Subsystem for Interconnection (CSFI) and Network Control Program Packet Switching Interface (NPSI) software are used in the system.

Husain, Shabu; Yang, Wen-Hsing; Vadlamudi, Rani; Valenti, Joseph

1993-11-01

150

Photonic Antennas for Wireless Communication System  

Microsoft Academic Search

In recently years, we have introduced a new concept of photonic antennas for wireless communication system using radio-over-fiber technology. The photonic antenna is a functional device in which a photonic device such as photodetector and a planar antenna are directly integrated to form a photonic feeding RF (Radio Frequency) transmitter. This paper presented our recent research activities on the experiments

Keren Li; Masayuki Izutsu

2004-01-01

151

A storage model for data communication systems  

Microsoft Academic Search

We consider a storage model where the input and demand are modulated by an underlying Markov chain. Such models arise in data communication systems. The input is a Markov-compound Poisson process and the demand is a Markov linear process. The demand is satisfied if physically possible. We study the properties of the demand and its inverse, which may be viewed

N. U. Prabhu; António Pacheco

1995-01-01

152

Architecture for Group Communication in Mobile Systems  

Microsoft Academic Search

In mobile computing systems the network configuration changes due to node mobility. The paper identifies the issues a group communication service has to take into account in order to handle node mobility. These include the need to identify the location of a node, and the ability to cope with inaccuracies in the determination of a group membership. A multi level

Ravi Prakash; Roberto Baldoni

1998-01-01

153

Future communication satellite systems and technology trends  

Microsoft Academic Search

Technological trends in communication satellite design and requirements were identified. The Intelsat program, TDR satellite systems, and the European large GEO platforms project were reviewed. There is a tendency towards modularized satellite buildup, large unfurlable lightweight multiple beam antennas 4 to 10 m for high frequencies (12 to 30 GHz) and up to larger than 100 m for lower frequencies,

H. Kellermeier; D. E. Koelle

1981-01-01

154

Multi-Eva Communications System Analysis.  

National Technical Information Service (NTIS)

A communications concept is analyzed to establish requirements of a confident candidate system for space shuttle. Conceptual baseline configurations, EVA's-to-spacecraft via PCM/FDM and spacecraft-to-EVA via PAM/FM, and respective functional performance r...

1972-01-01

155

Propagation prediction models for wireless communication systems  

Microsoft Academic Search

A comprehensive review of the propagation prediction models for terrestrial wireless communication systems is presented in this paper. The classic empirical models are briefly described and the focus is placed on the application of ray-tracing techniques to the development of deterministic propagation models. Schemes to increase the computational efficiency and accuracy are discussed. Traditional statistical models are also briefly reviewed

Magdy F. Iskander; Zhengqing Yun

2002-01-01

156

A Subjectively Adapted Image Communication System  

Microsoft Academic Search

An interactive image communication system is described transmitting image information stored in a central database over low-bitrate channels. To shorten the transmission time, a data compression technique is applied in combination with a progressive image transmission procedure. Furthermore, human interaction is implemented in order to select specific areas for picture buildup or to reject additional image sharpening completely. The mean

HERBERT LOHSCHELLER

1984-01-01

157

Small Submersible Acoustic Communications System Design  

Microsoft Academic Search

A design is presented for a system providing highly reliable command and control acoustic communications between a mother ship and a number of small, fast submersibles. The small submersibles may be employed for underwater mining, exploration, bottom mapping, or military surveillance. Modulation and coding design is presented; the techniques discussed provide multiple protection against multipath and fading, high reliability, acceptable

Salvatore D. Morgera

1978-01-01

158

Multiple terminal acoustic communications system design  

Microsoft Academic Search

A design is presented for a system providing highly reliable command and control acoustic communications between a mother ship and a number of small fast submersibles. The small submersibles may be employed for underwater mining, exploration, bottom mapping, or military surveillance. Modulation and coding design is presented; the techniques discussed provide multiple protection against multipath and fading, high reliability, acceptable

SALVATORE D. MORGERA

1980-01-01

159

Coke oven battery with communication system  

US Patent & Trademark Office Database

A coke oven communication and control system uses high frequency spread spectrum transceivers which are land based (connected to a central controller) and machine based (on a charging car, door machine, pusher, or quench car). Each land based transceiver communicates with a single corresponding machine based transceiver, there being different frequencies for each of the machines. Except for the quenching car transceivers, the other land and machine transceivers all are selectively connected to a pair of antennas which are alternately used to overcome interference. An advantageous communication technique is used to send data between a central controller, known as a battery programmable logic controller (PLC), and the machines. Control strategies are used to minimize malfunctioning of the coke oven battery.

1997-02-04

160

A systemic focus for communications research, debate and policy  

Microsoft Academic Search

Communications content is manipulable only with extreme difficulty, and communications technology is only tenuously directable towards the social objectives of policy. Therefore a new, 'systemic' focus for communications policy, and the research and debate which support it is needed. A descriptive and analytical model of communications systems (called the CETTEMometer) is presented and demonstrated which focuses neither on content nor

Roger D. Popper

1982-01-01

161

Communication modeling for system-level design  

Microsoft Academic Search

Multiprocessor systems-on-chip (MPSoCs) are emerging as a popular SoC design platform. However, major challenges arise from nonscaling global wire delay and from the reuse of intellectual properties (IPs) from different vendors to meet tight time-to-market constraints. Designing the appropriate communication fabrics for such heterogeneous systems becomes a challenging task. In this paper, we present accurate delay, power, and area models

Andrew B. Kahng; Kambiz Samadi

2008-01-01

162

Design aspects of soliton communication systems  

NASA Astrophysics Data System (ADS)

We examine the main constraints on the design of single- channel, high-bit rate soliton communication systems. In the average soliton regime, the main limitation for transoceanic fiber links is the Gordon-Haus jitter, while for shorter transmission distances it arises from the discrete in-line amplification. The use of dispersion-decreasing fibers and of periodic optical phase conjugation can increase the system capacity.

Ferreira, Mario F.

1999-07-01

163

The role of communication systems in emergency medical services  

Microsoft Academic Search

The important role that land mobile communication systems play in the effective operation of an emergency medical services (EMS) system is discussed. The need for EMS systems, classification of types of communication subsystems, FCC Rules and Regulations for EMS, what to do before designing communication systems, and examples of several systems are given.

1976-01-01

164

E-COSMIC: embodied communication system for mind connection  

Microsoft Academic Search

On the basis of the embodied entrainment between speech and body motions such as nodding in face-to-face communication, embodied communication system for mind connection (E-COSMIC) is developed for supporting essential human interaction and communication. E-COSMIC consists of the embodied virtual communication system for human interaction analysis by synthesis and the speech-driven embodied interaction system for embodied interaction and communication support

Tomio Watanabe

2004-01-01

165

SLCSAT (Submarine Laser Communication Satellite) communication system design study  

Microsoft Academic Search

This report summarizes the results of a Lincoln Laboratory study of issues affecting Submarine Laser Communication Satellite (SLCSAT) implementation. The study compares alternative SLCSAT downlink implementations using semiconductor and solid-state lasers in terms of the satellite transmitter power required to provide a given level of communication service. Signal coding is applied to increase transmitter design flexibility by accommodating a wider

S. L. Bernstein; R. S. Bondurant; E. A. Bucher; V. W. Chan; F. G. Walther

1989-01-01

166

Proceedings of the Military Communications System Control Symposium  

NASA Astrophysics Data System (ADS)

Contents: Perspective on Communications System Control, Navy Force Coordination and the Requirements for Communications Network Management, On the Functions of a Network Management Agency, Improved Control and Technical Management of DCS Theater Assets Under Crisis and Wartime Conditions, Survivability Performance of MX Communication System, System Control for the Tactical/Strategic Interface, Tactical Circuit-Switched Network Control, Systems Control in Tactical Digital Communications Systems - a Study in Distributed Control, the NATO III Satellite Communications Control System, Network Control in NATO Integrated Communications Systems - Stage I, Evolution of Control in the Defense Satellite Communication System, System Control Considerations for Next Generation DCS Switches, Evolving Approaches to System control in the Defense Communications Systems(DCS), and Network control and the CRM Make Possible Automated Digital Patching.

Harris, S.; Heller, J.

1980-11-01

167

A system for monitoring and improving animal visibility and its implications for zoological parks.  

PubMed

With the growing trend in zoos to build complex, naturalistic exhibits comes the potential for exhibits to be so densely vegetated or complex that animals are not easily seen by zoo visitors. This can negatively impact the visitor's visiting experience and the zoo's ability to communicate conservation and education messages. Over the past 9 years, Disney's Animal Kingdom has developed a process for monitoring and improving the visibility of animals on display to the public. This animal visibility process utilizes a data collection system whereby systematic observations are collected each week. The percentage of observations where at least one animal was visible is recorded for each species and compared to an 80% visibility criterion. Species that do not reach this criterion for 4 consecutive weeks are discussed at animal management meetings. If the problems associated with animal visibility cannot be easily solved, the animal-care teams partner with the research team to conduct a second process, called the Visibility Issues Process. This process provides additional information for the animal-care team to utilize in developing a plan to improve visibility. Although the processes described here are specific to the infrastructure at Disney's Animal Kingdom, the basic concepts of (1) a formalized visibility data collection process, (2) a visibility criterion to which managers of species are held accountable, and (3) a process for planning to improve animal visibility without negatively impacting animal welfare are fundamental concepts that can be developed at individual institutions and incorporated into that zoo's existing infrastructure. PMID:19382165

Kuhar, C W; Miller, L J; Lehnhardt, J; Christman, J; Mellen, J D; Bettinger, T L

168

System and Method of Animal Identification and Animal Transaction Authorization Using Iris Patterns.  

National Technical Information Service (NTIS)

A system and method of identification of an animal based on features of the iris of an eye are disclosed. An image of the animal's eye is captured using an iris acquisition device that combines a camera, an optical system, an illumination source, and a vi...

C. Musgrave J. L. Cambier

1999-01-01

169

A new optical secure communication system  

NASA Astrophysics Data System (ADS)

An optical secure communication system based on digital chaos and Polarization Shift Keying (PolSK) technology is proposed. In several selected PolSK schemes, states of polarization are partially or totally uniform on Poincare sphere. Different PolSK schemes are chosen according to the real-time chaos-based pseudo-random sequences to modulate original information in different periods of clock of the transmitter. In the receiver, according to the synchronous chaotic sequences, corresponding PolSK schemes are used to demodulate the information. Simulation is carried out by using the softwares of OptiSystem and Matlab. Some analysis results are presented. In the conclusion, this system works well in communication and has strong anti-attack capacity.

Luo, Fan; Fang, Nian; Huang, Zhaoming; Wang, Chunhua

2007-10-01

170

Distributed algorithms over communicating membrane systems.  

PubMed

This paper presents fundamental distributed algorithms over membrane systems with antiport carriers. We describe distributed algorithms for collecting and dispersing information, leader election in these systems, and the mutual exclusion problem. Finally, we consider membrane systems producing correct results despite some failures at some of the components or the communication links. We show that membrane systems with antiport carriers provide an appropriate model for distributed computing, particularly for message-passing algorithms interpreted here as membrane transport in both directions, namely when two chemicals behave as input and output messages and pass the membranes in both directions using antiport carriers. PMID:12915270

Ciobanu, Gabriel

2003-07-01

171

Secure Communication in Global Systems for Mobile Telecommunications  

Microsoft Academic Search

The digital cellular mobile telecommunication systems have become the trend of future personal communications services (PCS). In order to satisfy the high quality of services, security functions have been embedded into new mobile communication systems. In this paper, we investigate the security issues in the mobile communication systems and focus especially on the security functions of the Global Systems for

Shiuh-Pyng Shieh; Chern-Tang Lin; Jung-Tao Hsueh

172

Advanced nurse-patient communication system.  

PubMed

Effective communication is the most important part of any healthcare organization. For many years, hospital nurse call solutions had been stand-alone systems with occasional integration to pocket paging for outputting patient call alerts to mobile staff. In the late 1990's, technology enabled in-building wireless phones to supplement or replace paging systems as a means of not only sending alerts, but also enabling voice communication between mobile staff and patients. Today's nurse call market requires integration of additional information from location and ADT (admit, discharge, transfer) systems into what have traditionally been nurse call applications. This system information is required not only at the nursing station, pagers, and phones, but also at PC's placed on each patient care floor in hallways, nurse stations, and offices, and at areas away from the patients, including administrator and clinical engineering offices. It is crucial that nurses have the latest patient information in their hand wherever they go in the hospital. In this paper, MatchMaker.NET has been developed to integrate all these technologies into the hospital's LAN to improve nurse-patient communication. PMID:21541690

Unluturk, Mehmet S

2011-05-04

173

Building intelligent communication systems for handicapped aphasiacs.  

PubMed

This paper presents an intelligent system allowing handicapped aphasiacs to perform basic communication tasks. It has the following three key features: (1) A 6-sensor data glove measures the finger gestures of a patient in terms of the bending degrees of his fingers. (2) A finger language recognition subsystem recognizes language components from the finger gestures. It employs multiple regression analysis to automatically extract proper finger features so that the recognition model can be fast and correctly constructed by a radial basis function neural network. (3) A coordinate-indexed virtual keyboard allows the users to directly access the letters on the keyboard at a practical speed. The system serves as a viable tool for natural and affordable communication for handicapped aphasiacs through continuous finger language input. PMID:22315546

Fu, Yu-Fen; Ho, Cheng-Seen

2010-01-05

174

Second generation picture archiving and communication systems  

NASA Astrophysics Data System (ADS)

A modern radiology department utilizes multimedia technologies to facilitate its operation. Multimedia technologies include hardware platform, information systems, databases, communication protocols, display technology and system interface and integration. Current existing PACS can not handle this multimedia information because of its closed architectural design. This paper describes the concept of second generation PACS and its design and implementation at the University of California, San Francisco. The second generation PACS concept consists of four major components: folder manager, platter manager, image and data format standardization, and integration of heterogeneous information systems.

Huang, H. K.; Arenson, Ronald L.; Lou, Shyh-Liang; Wong, Albert W.; Andriole, Katherine P.; Bazzill, Todd M.; Avrin, David A.; Gould, Robert G.

1994-05-01

175

Emergence of a Communication System: International Sign  

NASA Astrophysics Data System (ADS)

International Sign (henceforth IS) is a communication system that is used widely in the international Deaf Community. The present study is one of the first to research extensively the origin of both the IS lexicon and grammatical structures. Findings demonstrate that IS is both influenced by naturally evolved sign languages used in grown deaf communities (henceforth SLs) and relies heavily on iconic, universal structures. This paper shows that IS continues to develop from a simplistic iconic system into a conventionalized system with increasingly complex rules.

Rosenstock, Rachel

176

Components for optical communications systems - A review  

Microsoft Academic Search

Current trends in research and development of components for optical communication are reviewed. Emphasis is placed on active components for fiber-optic systems which have undergone recent major advances. Basic properties of optical fibers and recent technological improvements in splices, connectors, and source\\/detector-fiber couplers are presented first. This background information serves as a basis for describing recent developments in optical sources

D. Botez; G. J. Herskowitz

1980-01-01

177

Optical communication system for drill hole logging  

SciTech Connect

An optical communication system for drill hole logging comprises an armored cable containing one or more glass clad optical fibers inside a tubular moisture barrier, a neodymium laser in the cable reel radiates infrared light into one of the fibers, a modulator in the downhole cable-head connector shell modulates light and returns it to the surface, and a semiconductor detector in the reel demodulates the data signal from the returning light.

Gould, G.

1985-10-15

178

A new optical secure communication system  

Microsoft Academic Search

An optical secure communication system based on digital chaos and Polarization Shift Keying (PolSK) technology is proposed. In several selected PolSK schemes, states of polarization are partially or totally uniform on Poincare sphere. Different PolSK schemes are chosen according to the real-time chaos-based pseudo-random sequences to modulate original information in different periods of clock of the transmitter. In the receiver,

Fan Luo; Nian Fang; Zhaoming Huang; Chunhua Wang

2007-01-01

179

Space-Based Optical Communication System Utilizing Fiber Optics.  

National Technical Information Service (NTIS)

The use of fiber optics to simplify the design of free-space laser communication systems is explored. The potential advantages of fiber optics within free-space optical communication systems are not widely recognized. The current generation of spaceborne ...

E. A. Swanson R. S. Bondurant

1989-01-01

180

Study on application of DSR protocol to mobile communication system  

Microsoft Academic Search

In general, the base station (BS) is fixed in the mobile communication system, however, which will be altered in some especial situations. To ensure the better communication, both BSs and mobile stations (MSs) of mobile communication network should be able to move in the network, namely entire mobility, which doesn't affect the communication of MSs. However, the route between BSs

Zhiyong Shi; Shenquan Zhu; Zhenyu Zhang

2005-01-01

181

A Systems Theory View of Organizations as Communication Networks.  

ERIC Educational Resources Information Center

|Focusing on the analysis of communication networks within organizations with an eye toward implications for study of external communication, this paper (1) develops a systems theory/communication view of the nature of formal organizations, (2) illustrates the notion of holistic organizational communication networks in organizations which include…

Schwartz, Donald F.

182

Walk to here: a voice driven animation system  

Microsoft Academic Search

We present a novel interface for directing the actions of computer animated characters and camera movements. Our system takes spoken input in combination with mouse pointing to generate desired character animation based on motion capture data. The aim is to achieve a more natural animation interfac e by supporting the types of di- alogue and pointing that might be used

Z. Wang; M. Van De Panne

2006-01-01

183

Therapeutic Ultrasound to Non-Invasively Create Intra-Cardiac Communications in an Intact Animal Model  

PubMed Central

Objective To determine if pulsed cavitational ultrasound therapy (histotripsy) can accurately and safely generate ventricular septal defects (VSDs) through the intact chest of a neonatal animal, with the eventual goal of developing a non-invasive technique of creating intra-cardiac communications in patients with congenital heart disease. Background Histotripsy is an innovative ultrasonic technique that generates demarcated, mechanical tissue fractionation utilizing high intensity ultrasound pulses. Previous work has shown that histotripsy can create atrial septal defects in a beating heart in an open-chest canine model. Methods Nine neonatal pigs were treated with transcutaneous histotripsy targeting the ventricular septum. Ultrasound pulses of 5?s duration at a peak negative pressure of 13 MPa and a pulse repetition frequency of 1 kHz were generated by a 1 MHz focused transducer. The procedure was guided by real-time ultrasound imaging. Results VSDs were created in all pigs with diameters ranging from 2–6.5mm. Six pigs were euthanized within 2 hrs of treatment, while 3 were recovered and maintained for 2–3 days to evaluate lesion maturation and clinical side effects. There were only transient clinical effects and pathology revealed mild collateral damage around the VSD with no significant damage to other cardiac or extra-cardiac structures. Conclusions Histotripsy can accurately and safely generate VSDs through the intact chest in a neonatal animal model. These results suggest that with further advances, histotripsy can be a useful, non-invasive technique to create intra-cardiac communications, which currently require invasive catheter-based or surgical procedures, to clinically stabilize newborn infants with complex congenital heart disease.

Owens, Gabe E.; Miller, Ryan M.; Ensing, Greg; Ives, Kimberly; Gordon, David; Ludomirsky, Achi; Xu, Zhen

2010-01-01

184

A hybrid communication architecture for intelligent shared vehicle systems  

Microsoft Academic Search

There has been a large degree of activity in the communications arena of intelligent transportation systems. Various communication linkages are being developed for a variety of ITS applications for different purposes. Shared vehicle systems, as a relatively new transportation paradigm, are very well suited for the application of ITS technology, including advanced communication techniques. In general, a shared vehicle system

Matthew Barth; Lei Xue; Yi Chen; Michael Todd

2002-01-01

185

The antenna system for the base station of mobile communication  

Microsoft Academic Search

The antenna system for a mobile communication base station in the meter (UHF) waveband is presented. Calculation of the antenna system is given and the effect of a mast on its radiation pattern rated. The designed antenna system allows the number of communication channels to be increased, increasing the communication range and improving its quality.

Aleksander V. Antonov; Yury M. Gerasimov

2003-01-01

186

Cassegrain antenna system based on free-space laser communication  

Microsoft Academic Search

Antenna, which whether transmits or receives correct signal or not is our main care and our direction, is an important part in any communication systems. Because of the characteristics of laser different from radio, the antenna system of point-to-point laser communication system must be designed strictly. In this paper, we mainly study the optical antenna in the space communication. We

Zhou Li

2006-01-01

187

A space-based optical communication system utilizing fiber optics  

Microsoft Academic Search

The use of fiber optics to simplify the design of free-space laser communication systems is explored. The potential advantages of fiber optics within free-space optical communication systems are not widely recognized. The current generation of spaceborne optical communication systems relies on the use of bulk optics rigidly mounted to an optical bench to get light from the optical sources to

Eric A. Swanson; Roy S. Bondurant

1989-01-01

188

Modelling and Evaluating Verbal and Non-Verbal Communication in Talking Animated Interface Agents  

Microsoft Academic Search

The use of animated talking agents is a novel feature of many multimodal experimental spoken dialogue systems. The addition\\u000a and integration of a virtual talking head has direct implications for the way in which users approach and interact with such\\u000a systems. Established techniques for evaluating the quality, efficiency, and other impacts of this technology have not yet\\u000a appeared in standard

Björn Granström; David House

189

Rendering systems for processing animal by-product materials  

Microsoft Academic Search

These systems are divided into two classes, edible rendering of animal fatty tissue into edible fats and proteins for human\\u000a consumption, and inedible rendering of animal by-product materials into animal fats and proteins for animal feed and other\\u000a non-edible applications.\\u000a \\u000a The inedible rendering process consists of two basic steps: “cooking” or moisture removal by evaporation, and separation of\\u000a the melted

William H. Prokop

1985-01-01

190

Affective Communication Remapping in MusicFace System  

Microsoft Academic Search

This paper addresses the issue of affective communication remapping, i.e. translation of affecti ve content from one communication form to another. We propose a method to extract the affective data from a piece of music and then use that to animate a face. The method is based on studies of emotional aspect of music and our behavioural head model for

Steve DiPaola; Ali Arya

191

Social-Communicative Effects of the Picture Exchange Communication System (PECS) in Autism Spectrum Disorders  

ERIC Educational Resources Information Center

|Background: The Picture Exchange Communication System (PECS) is a common treatment choice for non-verbal children with autism. However, little empirical evidence is available on the usefulness of PECS in treating social-communication impairments in autism. Aims: To test the effects of PECS on social-communicative skills in children with autism,…

Lerna, Anna; Esposito, Dalila; Conson, Massimiliano; Russo, Luigi; Massagli, Angelo

2012-01-01

192

76 FR 72897 - Privacy Act Systems of Records; APHIS Animal Health Surveillance and Monitoring System  

Federal Register 2010, 2011, 2012, 2013

...DEPARTMENT OF AGRICULTURE Animal and Plant Health Inspection Service [Docket...Privacy Act Systems of Records; APHIS Animal Health Surveillance and Monitoring System AGENCY: Animal and Plant Health Inspection Service,...

2011-11-28

193

Animation  

Microsoft Academic Search

\\u000a Right from its inception, a main strength of Flash has been its animation capabilities. Despite the arrival of ActionScript\\u000a programming shifting the focus somewhat, animation (or tweening in Flash authoring terms) is still considered a core feature of Flash. As yet, we have no timeline functionality for animating\\u000a 3D objects aside from some limited 2.5 effects (the “postcards in space”

Rob Bateman; Richard Olsson

194

Animation  

Microsoft Academic Search

\\u000a Ah, animation! Where would we be without the likes of Disney, Warner Bros., Walter Lanz, Hanna-Barbera, and dozens more like\\u000a them? For many people, animation is the reason to get involved with Flash as a creative outlet. This makes perfect sense, because Flash began life more than a decade ago\\u000a as an animation tool. Supplemental features like ActionScript, XML parsing,

Tom Green; David Stiller

195

Lifeline Communication System in the Internet  

Microsoft Academic Search

The spread of the Internet has made it important as a potential means of lifeline communication. The Internet can fulfill a role in the everyday life of citizens by offering lifeline communication services such as the police, ambulance, gas, electricity, water service when an emergency occurs. In these lifeline communications, a caller needs to be able to communicate with the

Takahiro Kikuchi; Masaaki Noro; Katsuyuki Yamazaki; Hideki Sunahara; Shinji Shimojo

2004-01-01

196

An undergraduate degree program for communication systems engineering  

Microsoft Academic Search

The increasing demand for skilled engineers in the fields of data communications and telecommunications industries called for the introduction of a new and unique undergraduate degree program for communication systems engineering. The methodology for determining the needs of this program, the formulation of its curriculum, a description of the communication systems engineer, and the student reaction to the program is

Ran Giladi

1999-01-01

197

Signal environment response of a generic mobile communication system  

Microsoft Academic Search

Mobile communication has been, and continues to be, an essential tactical requirement for many types of commercial and military operations involving cellular mobile communication systems, radio communication stations and mobile forces. Specific mobile unit requirements vary widely because of different needs and different traditional methods of satisfying such needs within the several branches of the customer. The system in object,

Servilio Sebastiani

1999-01-01

198

Fault detection of networked control systems with limited communication  

Microsoft Academic Search

Fault detection (FD) of networked control systems (NCS) with limited communication is addressed in this article. In periodic communication sequence-based NCS, at each time instant only parts of the actuators and sensors are allowed to communicate with the central FD system, which leads to incomplete plant information at the central station. In this article, a parity space based multi-solution FD

Yongqiang Wang; Hao Ye; Steven X. Ding; Yue Cheng; Ping Zhang; Guizeng Wang

2009-01-01

199

Dynamic communication models in embedded system co-simulation  

Microsoft Academic Search

Many co-simulation techniques either suffer from poor performancewhen simulating communications intensive systems, or theyrepresent communications with a uniformly low level of detail.This paper presents a technique which allows communication tobe represented at multiple levels of detail and which gives a designerthe ability to dynamically choose the appropriate level fordifferent parts of the system. This paper also presents a tool whichuses

Ken Hines; Gaetano Borriello

1997-01-01

200

Optical communication system expands CORK seafloor observatory's bandwidth  

Microsoft Academic Search

An important aspect of deploying scientific sensors in the deep sea is reliable underwater communication. We have developed an optical communication system that complements and integrates with an acoustic system to provide underwater communications that is capable of high data-rates and low latency in clear water combined with long range and robustness in the presence of high turbidity. This combined

N. Farr; J. Ware; C. Pontbriand; T. Hammar; M. Tivey

2010-01-01

201

Talk to the Virtual Hands: Self-Animated Avatars Improve Communication in Head-Mounted Display Virtual Environments  

PubMed Central

Background When we talk to one another face-to-face, body gestures accompany our speech. Motion tracking technology enables us to include body gestures in avatar-mediated communication, by mapping one's movements onto one's own 3D avatar in real time, so the avatar is self-animated. We conducted two experiments to investigate (a) whether head-mounted display virtual reality is useful for researching the influence of body gestures in communication; and (b) whether body gestures are used to help in communicating the meaning of a word. Participants worked in pairs and played a communication game, where one person had to describe the meanings of words to the other. Principal Findings In experiment 1, participants used significantly more hand gestures and successfully described significantly more words when nonverbal communication was available to both participants (i.e. both describing and guessing avatars were self-animated, compared with both avatars in a static neutral pose). Participants ‘passed’ (gave up describing) significantly more words when they were talking to a static avatar (no nonverbal feedback available). In experiment 2, participants' performance was significantly worse when they were talking to an avatar with a prerecorded listening animation, compared with an avatar animated by their partners' real movements. In both experiments participants used significantly more hand gestures when they played the game in the real world. Conclusions Taken together, the studies show how (a) virtual reality can be used to systematically study the influence of body gestures; (b) it is important that nonverbal communication is bidirectional (real nonverbal feedback in addition to nonverbal communication from the describing participant); and (c) there are differences in the amount of body gestures that participants use with and without the head-mounted display, and we discuss possible explanations for this and ideas for future investigation.

Dodds, Trevor J.; Mohler, Betty J.; Bulthoff, Heinrich H.

2011-01-01

202

Communication Systems through Artificial Earth Satellites (Selected Pages).  

National Technical Information Service (NTIS)

Contents: Principles of the Construction of Communication Systems Through Artificial Earth Satellites; Motion of Satellites and Duration of Periods of Communication; Signal Level at the Input of Receiver; Noise Level at the Input of a Receiver; Calculatio...

N. I. Kalashnikov

1987-01-01

203

Stabilization of Networked Control Systems: Designing Effective Communication Sequences.  

National Technical Information Service (NTIS)

This paper discusses the stabilization of a networked control system (NCS) whose sensors and actuators exchange information with a remote controller over a shared communication medium. Access to that medium is governed by a pair of periodic communication ...

L. Zhang D. Hristu-Varsakelis

2004-01-01

204

National Airspace System. Communications Operational Concept NAS-SR-136.  

National Technical Information Service (NTIS)

A requirement of the National Airspace System (NAS) is to provide for communications, as identified in the NAS Requirement Specification, NAS-SR-1000 (NASSRS). A concept of operation for air-ground, ground-ground communications connectivity and capability...

W. Trent T. Pickerell H. Nelson

1991-01-01

205

21 CFR 892.2050 - Picture archiving and communications system.  

Code of Federal Regulations, 2013 CFR

...Diagnostic Devices § 892.2050 Picture archiving and communications system. (a) Identification. A picture archiving and communications...Group (JPEG) Std., Society of Motion Picture and Television Engineers...

2013-04-01

206

Farm Animal Welfare: A Systemic Challenge  

Microsoft Academic Search

There are two questions that are central to talk of improvements in any particular human enterprise: Who decides what constitutes\\u000a “better” in any specific context– And what particular criteria for betterment are privileged in that context– As animal scientist\\u000a David Fraser illustrates in his chapter on the intensification of livestock production, even in the case of something as seemingly\\u000a straightforward

Richard Bawden

207

Ten years' work on the World Organisation for Animal Health (OIE) Worldwide Animal Disease Notification System.  

PubMed

This article gives an overview of the World Organisation for Animal Health (OIE) Worldwide Animal Disease Notification System and highlights the major achievements during the past decade. It describes the different types of disease notification reports received and processed by the OIE. It also evaluates the three strategies implemented by the OIE in the recent years aimed at improving disease notification: introduction and use of a secure online notification system World Animal Health Information System (WAHIS) and its database interface World Animal Health Information Database (WAHID); implementation of active search and verification procedures for non-official information; and enhanced building of capacity for animal disease notification to the OIE by Members Countries. The improvements are evidenced by the increasing number of reports submitted on an annual basis and the reduction in submission time together with an improvement in the quality and quantity of the immediate notifications and follow-up reports, six-monthly and annual reports submitted by Veterinary Authorities. In the recent years, the OIE's notification system provides an early warning system more sensitive and global. Consequently, there is a greater knowledge of animal diseases' distribution worldwide. As a result, it is possible to ensure better prevention, more accurate risk assessment and evaluation by diminishing the spread of known or newly emerging pathogens. PMID:22947122

Jebara, Karim Ben; Cáceres, Paula; Berlingieri, Francesco; Weber-Vintzel, Laure

2012-09-01

208

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

209

A 3-D Traffic Animation System with Storm Surge Response  

Microsoft Academic Search

This paper presents a 3D traffic animation system that provides features of vehicle interaction and storm surge response to emulate realistic scenarios in a hurricane affected area. The proposed system constructs road objects based on a series of line segments. Vehicles on the roads are animated by keeping them coherent with the direction of the road segment and adjusting their

Yudan Li; Kasturi Chatterjee; Shu-Ching Chen; Keqi Zhang

2009-01-01

210

A silicon early visual system as a model animal  

Microsoft Academic Search

Examples that show the transfer of our basic knowledge of brain function into practical electronic models are rare. Here we present a user-friendly silicon model of the early visual system that contributes to animal welfare. The silicon chip emulates the neurons in the visual system by using analog Very Large Scale Integration (aVLSI) circuits. It substitutes for a live animal

Tobi Delbrück; Shih-Chii Liu

2004-01-01

211

Children's Interactions with Animated Agents in an Intelligent Tutoring System  

Microsoft Academic Search

Although animated pedagogical agents are frequently found in intelligent tutoring systems and interactive learning environments, their effect on users' attitudes and learning requires further investigation. This paper reports findings of a field study designed to investigate the impact of animated pedagogical agents on primary school children's attitudes to and interactions with the StoryStation system. Sixty pupils used either a version

Judy Robertson; Beth Cross; Hamish Macleod; Peter M. Wiemer-hastings

2004-01-01

212

National airspace system air-ground communications operational concept  

Microsoft Academic Search

A requirement for the National Airspace System (NAS) is to provide for air-ground communications, as identified in the NAS System Requirement Specification, NAS-SR-1000. A concept of operations for air-ground communications is presented. Air-ground communications capabilities are described and the relationships are shown between subsystems, facilities, information, and operators\\/users. A common perspective is provided for personnel involved in air-ground communication activities.

William Trent; Rodney Kuhn; Thomas Pickerell

1990-01-01

213

A personal and inter-vehicle cordless communications system  

Microsoft Academic Search

The Northrop Grumman cordless communications system (CCS) is a state-of-the-art, wireless communications system targeted for tomorrow's armored battlefield. Through a single, hand-held or body-mounted personal communications unit (PCU), the CCS provides the soldier with access to a digital, full-duplex wireless intercom, as well as the capability to simultaneously communicate over a point-to-point digital data link. In addition, through the use

W. Jacklin; S. Collar; S. Stratmoen; B. Fitzpatrick; J. Stone

1999-01-01

214

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

215

Passive monitoring for automated MMPP communication systems  

NASA Astrophysics Data System (ADS)

A recently completed study of passive sensing techniques for hf communication systems has shown that these sensing techniques can yield data which may be of use in the control of adaptive hf communication systems. The aim of this paper is to review work carried out to date on these techniques and to examine the feasibility of applying similar techniques to radio systems utilizing higher carrier frequencies, up to around 200MHz, where many propagation modes other than ionospheric skywave may exist. Whilst inputs for the control of adaptive radio systems may be derived from a number of sources, many techniques, such as pilot-tone soundings and the transmission of training sequences, involve radiation of signals which may be undesirable in a tactical situation. System control information may also be derived by monitoring other signals which are already present in related parts of the radio spectrum, allowing more covert operation and avoiding unnecessary pollution of the radio spectrum. Derivation of such control information for use in hf systems has been studied in some detail, utilizing the following types of radio signals existing in the hf band: swept frequency sounder signals radiated by other uses of the hf spectrum, broadcast signals, standard time signals, meteorological data signals (RTTY), and overall statistical occupancy measurements of the spectrum. Some of these techniques would also be applicable to the multimechanism case, provided that the more complex propagation inversion, which is due to the greater range of propagation mechanisms available, can be taken into account. Additional, higher frequency, sources of RF energy which may provide data through passive monitoring, include aeronautical navigation beacons, amateur beacons and various types of radar signals. Use may also be made of low-orbiting satellite signals, although these present tracking problems in terms of doppler shift and give data mainly related to ionospheric scintillation and hence magnetic storm effects.

Riley, N. G.

1994-07-01

216

Mission Science Value-Cost Savings from the Advanced Imaging Communication System (AICS) (Advanced Imaging Communication System).  

National Technical Information Service (NTIS)

An Advanced Imaging Communication System (AICS) was proposed in the mid-1970s as an alternative to the Voyager data/communication system architecture. The AICS achieved virtually error free communication with little loss in the downlink data rate by conca...

R. F. Rice

1984-01-01

217

Development of an Integrated Wheelchair Tray System for Augmentative Communication  

Microsoft Academic Search

This paper describes the development of a wheelchair tray system for persons with physical disabilities who require an augmentative communication system. The tray system offers advantages over existing systems by providing a convenient anterior\\/posterior tilt feature, a means for stowing the tray when not in use, and a method of accommodating communication systems and powered wheelchair controls. Caregivers of seven

Susie Blackstien-Adler; Steve Ryan; Stephen Naumann; Penny Parnes

1990-01-01

218

NPSNET: Object Animation Script Interpretation System.  

National Technical Information Service (NTIS)

NPSNET is a real-time, 3D visual simulation system capable of displaying various types of vehicles - ground, ships, and aircraft. The system is capable of displaying additional objects such as missiles, buildings, trees, and environmental effects, such as...

P. D. West

1991-01-01

219

Communication.  

ERIC Educational Resources Information Center

|The following essays on communication are presented: communication as a condition of survival, communication for special purposes, the means of transmission of communication, communication within social and economic structures, the teaching of communication through the press, the teaching of modern languages, communication as a point of…

Strauss, Andre

220

Dimensioning of communication links for base-station and MSC interconnection in CDMA mobile communication systems  

Microsoft Academic Search

In CDMA mobile communication systems, voice is encoded and packaged in variable length packets that are transported between the mobile station and the switching center. While the packetization provides great flexibility in resource allocation, it poses a QOS challenge on voice. We discuss link dimensioning for a typical CDMA system. We consider a communication link connecting a CDMA base-station and

Khaled M. F. Elsayed

1997-01-01

221

Communications technology guidelines for EMS\\/SCADA systems  

Microsoft Academic Search

The purpose of this Guideline Technical Paper is to provide a summary of the different communications technologies available for use or application with EMS\\/SCADA system projects. All of the various communication media are addressed with a brief description along with tables of the advantages and disadvantages of each and recommendations for choosing the most appropriate communication technology. The technologies discussed

Donald J. Marihart

2001-01-01

222

Communication and control co-design for networked control systems  

Microsoft Academic Search

This paper discusses the stabilization of a networked control system (NCS) in which sensors and actuators of a plant exchange information with a remote controller via a shared communication medium. Access to that medium is governed by a pair of periodic communication sequences. Under the model utilized here, the controller and plant handle communication disruptions by “ignoring” (in a sense

Lei Zhang; Dimitrios Hristu-varsakelis

2006-01-01

223

Establishing conventional communication systems: Is common knowledge necessary?  

Microsoft Academic Search

How do communities establish shared communication systems? The Common Knowledge view assumes that symbolic conventions develop through the accumulation of common knowledge regarding communication practices among the members of a community. In contrast with this view, it is proposed that coordinated communication emerges a by-product of local interactions among dyads. A set of multi-agent computer simulations show that a population

Dale J. Barr

2004-01-01

224

Base station layout support system for indoor visible light communication  

Microsoft Academic Search

In this paper, we propose a base station layout support system for indoor visible light communication using LED for general indoor lighting. Recently, LED comes into practical use and visible light communications using LED have been proposed. However, a method which provides an optimal base station layout for visible light communications based on some environments and conditions has not been

Ikutake Miya; Yoshinobu Kajikawa

2010-01-01

225

Revolutionary next generation satellite communications architectures and systems  

Microsoft Academic Search

This paper describes possible revolutionary next generation communications satellite missions and architectures. The satellite communications evolutionary background, current GSO's (geostationary orbit satellites), `Little', `Big' and `Broadband' NGSO's (non-GSO's), and enabling satellite technologies are briefly discussed. Converging technological and economic forces will drive us inevitably to the next decade's communication satellite systems and network architectures. The increasing pace of new capabilities,

J. R. Stuart; J. G. Stuart

1997-01-01

226

Shared Communications: Volume 2. In-Depth Systems Research  

SciTech Connect

This report is the second of two documents that examine the literature for actual examples of organizations and agencies that share communications resources. While the primary emphasis is on rural, intelligent transportation system (ITS) communications involving transit, examples will not be limited to rural activities, nor to ITS implementation, nor even to transit. In addition, the term ''communication'' will be broadly applied to include all information resources. The first document of this series, ''Shared Communications: Volume I. A Summary and Literature Review'', defines the meaning of the term ''shared communication resources'' and provides many examples of agencies that share resources. This document, ''Shared Communications: Volume II. In-Depth Systems Research'', reviews attributes that contributed to successful applications of the sharing communication resources concept. A few examples of each type of communication sharing are provided. Based on the issues and best practice realworld examples, recommendations for potential usage and recommended approaches for field operational tests are provided.

Truett, LF

2004-09-22

227

Group Support Systems and Deceptive Communication  

Microsoft Academic Search

Electronic communication is becoming more pervasive worldwide with the spread of the Internet, especially through the World Wide Web and electronic mail. Yet, as with all human communication, electronic communication is vulnerable to deceit on the part of senders, and to the less than stellar performance of most people at defecting deceit aimed at them. Despite considerable research over the

Joey F. George; John R. Carlson

1999-01-01

228

Abstract Communication Model for Distributed Systems  

Microsoft Academic Search

Abstract, In some distributed and mobile communication models, a message disappears in one place and miraculously appears in another. In reality, of course, there are no miracles. A message goes from one network to another; it can be lost or corrupted in the process. Here, we present a realistic but high-level communication model where abstract communicators represent various nets and

Uwe Glässer; Yuri Gurevich; Margus Veanes

2004-01-01

229

Computing effective communication policies in multiagent systems  

Microsoft Academic Search

1. ABSTRACT Communication is a key tool for facilitating multiagent coordination in cooperative and uncertain domains. We focus on a class of multiagent problems modeled as De- centralized Markov Decision Processes with Communication (DEC-MDP-COM) with local observability. The planning problem for computing the optimal communication strategy in such domains is often formulated with the assumption of the knowledge of optimal

Doran Chakraborty; Sandip Sen

2007-01-01

230

Communication and management support in system development environments  

Microsoft Academic Search

A System Development Support Environment that assists in communication and management tasks of software project members should aid the development of large, evolutionary computer systems. The environment proposed in this paper will include integrated capabilities for project management, system evaluation, documentation\\/help, and intelligent communication between designers\\/users, and either the system or other designers. The goal is to have the environment

Beverly I. Kedzierski

1982-01-01

231

A digital transmission system for global maritime satellite communications  

Microsoft Academic Search

A digital transmission system for global maritime satellite communications has been designed, and experimental communications equipment has been developed, taking account of its potential application to the Inmarsat system where analog modulation is currently used for telephone signal transmission. This paper discusses possible digital technologies to realize an efficient digital transmission system, and presents a concept for the designed system.

Y. Hirata; Y. Yasuda; H. Okinaka; K. Kashiki

1984-01-01

232

A Fault Tree Approach to Analysis of Organizational Communication Systems.  

ERIC Educational Resources Information Center

|Fault Tree Analysis (FTA) is a method of examing communication in an organization by focusing on: (1) the complex interrelationships in human systems, particularly in communication systems; (2) interactions across subsystems and system boundaries; and (3) the need to select and "prioritize" channels which will eliminate noise in the system and…

Witkin, Belle Ruth; Stephens, Kent G.

233

Communicating Earth System Science Through Exhibitions  

NASA Astrophysics Data System (ADS)

The general public's knowledge of earth system science has lagged behind the extraordinary discoveries that scientists are now making. And yet, as can be seen in the daily news, we are constantly confronted with the impacts of Earth's systems. Enhancing the public's understanding of earth system science is vitally important. The Space Science Institute is a national leader in developing space-themed exhibitions. One of its exhibit projects, still in the development stage, is called Interactive Earth. The major goal of the exhibit is to introduce students and the public to the complexity of the interconnections in the earth system, and thereby, to inspire them to see the world in new ways. The exhibit will be divided into five areas: Spaceship Earth, Water World, Rock and Roll, Web of Life, and Earthworks for Kids. This division allows the exhibit to address major components of the earth system: the geosphere (Rock and Roll), hydrosphere (Water World), biosphere (Web of Life), and atmosphere, which pervades every area. Each area lends itself to opportunities to illustrate interconnections between the exhibit areas. This report will focus on the front-end evaluation results that were conducted several years ago for the project. These results will then be compared to other evaluation studies (both formal & informal) in order to paint a more thorough picture of how best to communicate this important but difficult science to the public.

Dusenbery, P. B.

2004-12-01

234

Radiation-hardened microwave communications system  

SciTech Connect

To develop a wireless communication system to meet the stringent requirements for a nuclear hot cell and similar environments, including control of advanced servomanipulators, a microwave signal transmission system development program was established to produce a demonstration prototype for the Consolidated Fuel Reprocessing Program at Oak Ridge National Laboratory (ORNL). Proof-of-principle tests in a partially metal lined enclosure at ORNL successfully demonstrated the feasibility of directed microwave signal transmission techniques for remote systems applications. The potential for much more severe radio-frequency (RF) multipath propagation conditions in fully metal lined cells led to a programmatic decision to conduct additional testing in more typical hot-cell environments at other sites. Again, the test results were excellent. Based on the designs of the earlier systems, an advanced microwave signal transmission system configuration was subsequently developed that, in highly reflective environments, will support both high-performance video channels and high baud-rate digital data links at total gamma dose tolerance levels exceeding 10{sup 7} rads and at elevated ambient temperatures.

Smith, S.F.; Bible, D.W.; Crutcher, R.I.; Hannah, J.H.; Moore, J.A.; Nowlin, C.H.; Vandermolen, R.I. [Oak Ridge National Lab., TN (United States); Chagnot, D.; LeRoy, A. [CEA Centre d`Etudes Nucleaires de Grenoble, 38 (France)

1993-03-01

235

Radiation-hardened microwave communications system  

SciTech Connect

To develop a wireless communication system to meet the stringent requirements for a nuclear hot cell and similar environments, including control of advanced servomanipulators, a microwave signal transmission system development program was established to produce a demonstration prototype for the Consolidated Fuel Reprocessing Program at Oak Ridge National Laboratory (ORNL). Proof-of-principle tests in a partially metal lined enclosure at ORNL successfully demonstrated the feasibility of directed microwave signal transmission techniques for remote systems applications. The potential for much more severe radio-frequency (RF) multipath propagation conditions in fully metal lined cells led to a programmatic decision to conduct additional testing in more typical hot-cell environments at other sites. Again, the test results were excellent. Based on the designs of the earlier systems, an advanced microwave signal transmission system configuration was subsequently developed that, in highly reflective environments, will support both high-performance video channels and high baud-rate digital data links at total gamma dose tolerance levels exceeding 10[sup 7] rads and at elevated ambient temperatures.

Smith, S.F.; Bible, D.W.; Crutcher, R.I.; Hannah, J.H.; Moore, J.A.; Nowlin, C.H.; Vandermolen, R.I. (Oak Ridge National Lab., TN (United States)); Chagnot, D.; LeRoy, A. (CEA Centre d'Etudes Nucleaires de Grenoble, 38 (France))

1993-01-01

236

Attacks on Inter Vehicle Communication Systems - an Analysis  

Microsoft Academic Search

Abstract—Inter-vehicle communication,systems are a new paradigm,of networking.,Largely related to mobile,ad hoc networks and their distributed, self-organizing structure, they also introduce,new,threats. In order,to assess these threats we introduce,a model,of attacks on an inter-vehicle communication,system in this paper. This model,is used to re- fine the system model of the NoW communication,system and to find potential weaknesses,during,the specification phase of the NoW communication,system.

Amer Aijaz; Bernd Bochow; Andreas Festag; Matthias Gerlach; Rainer Kroh

237

Static and Animated Presentations in Learning Dynamic Mechanical Systems  

ERIC Educational Resources Information Center

|In two experiments, we investigated how learners comprehend the functioning of a three-pulley system from a presentation on a computer screen. In the first experiment (N = 62) we tested the effect of static vs. animated presentations on comprehension. In the second experiment (N = 45), we tested the effect of user-control of an animated

Boucheix, Jean-Michel; Schneider, Emmanuel

2009-01-01

238

SRec: an animation system of recursion for algorithm courses  

Microsoft Academic Search

In this paper we describe SRec, a system to animate recursion in Java programs. It is intended to assist in algorithm courses to better understand and analyze algorithm behavior. We make several contributions. Firstly, SRec exhibits a comprehensive set of animation and educational features. It provides three complem- entary, coordinated views of recursion: traces, the execution stack and activation trees.

J. Ángel Velázquez-Iturbide; Antonio Pérez-Carrasco; Jaime Urquiza-Fuentes

2008-01-01

239

Static and Animated Presentations in Learning Dynamic Mechanical Systems  

ERIC Educational Resources Information Center

In two experiments, we investigated how learners comprehend the functioning of a three-pulley system from a presentation on a computer screen. In the first experiment (N = 62) we tested the effect of static vs. animated presentations on comprehension. In the second experiment (N = 45), we tested the effect of user-control of an animated

Boucheix, Jean-Michel; Schneider, Emmanuel

2009-01-01

240

Conference circuit for a digital communication system  

US Patent & Trademark Office Database

A 001 conference circuit for a digital communication system in which the analog-to-digital and digital-to-analog converters of at least two subscriber terminal stations have different bandwidth of their processable analog signals or in the code format of the digital signals or in the bit rate of the digital signals. It is not necessary for any conference participant to adapt to the equipment of any one of the other participants because the conference circuit comprises transcoders and corresponding transdecoders of different construction for each conference participant. This anoids the requirement that all conference participants must agree on the same bandwidth, the same code and the same bit rate. When establishing a conference connection, a control circuit actuates the appropriate transcoder and the corresponding transdecoder required for each conference participant. Each conference participant receives signals from the other participants during the conference, having the same quality as in the case of a connection between only two participants.

1989-07-04

241

Pursuit-deterrent communication between prey animals and timber rattlesnakes ( Crotalus horridus ): the response of snakes to harassment displays  

Microsoft Academic Search

A thorough understanding of communication requires an evaluation of both the signaler and receiver. Most analyses of prey–predator communication are incomplete because they examine only the behavior of the prey. Predators in these systems may be understudied because they are perceived as less tractable research subjects, due to their more cryptic hunting behaviors and secretive lifestyles. For example, research on

Rulon W. Clark

2005-01-01

242

High capacity satellite communication system and key technologies  

Microsoft Academic Search

A high-capacity satellite communication system for Japan, with multiple beams and key technologies for onboard equipment, is described. The system will provide trunk transmission, digital business communication, and mobile communication. Advantages of the multibeam system include increased transmission capacity, reduction in earth-station antenna diameter, and frequency reuse. Onboard technologies discussed include cluster-feed horn design, reflector deployment, antenna pointing control (accurate

Y. Nagai; S. Okasaka; K. Nakagawa

1986-01-01

243

Animal eyes in homeland security systems  

NASA Astrophysics Data System (ADS)

In this paper, biologically-inspired optical imaging systems, including fish eye, bug eye, lobster eye, and RGB color vision, are discussed as new lensing systems for military and homeland security applications. This new area of interest includes UV, VIS, IR, and X-ray part of electromagnetic spectrum. In particular, recent progress at Physical Optics Corporation will be discussed, including such applications as hyperspectral/multi-spectral imagery, video surveillance, and X-ray inspection.

Jannson, Tomasz; Kostrzewski, Andrew; Gertsenshteyn, Michael; Grubsky, Victor; Shnitser, Paul; Agurok, Ilya; Bennahmias, Mark; Lee, Kang; Savant, Gajendra

2007-05-01

244

NPOESS McMurdo Multimission Communications System  

NASA Astrophysics Data System (ADS)

The National Oceanic & Atmospheric Administration (NOAA), Dept. of Defense (DoD), and National Aeronautics & Space Administration (NASA) are jointly acquiring the next-generation weather/environmental satellite system - the National Polar-orbiting Operational Environmental Satellite System (NPOESS). NPOESS replaces the current NOAA Polar-orbiting Operational Environmental Satellites (POES) and DoD Defense Meteorological Satellite Program (DMSP). NPOESS sensors will collect meteorological, oceanographic, climatological and solar-geophysical data of the earth, atmosphere and space. Northrop Grumman Aerospace Systems (NGAS), NPOESS’ prime contractor, provides the Space Segment (SS). The NPOESS command & data distribution part known as the Command, Control & Communications Segment (C3S), developed by Raytheon Intelligence & Information Systems, manages the overall mission from control & status of the space & ground assets to ensuring delivery of timely, high-quality data from the SS to the Interface Data Processing Segment (IDPS). A C3S data-delivery system key feature is SafetyNetTM (a NGAS trademark), 15 globally-distributed ground receptors developed by Raytheon. These antennae will collect up to 5X as much environmental data about 4X faster than current polar-orbiting weather satellites. These data will then be forwarded nearly at once to US weather centrals via the global fiber optic network for processing & production of data records for use in environmental prediction models. McMurdo Antarctica is a significant SafetyNetTM antenna site due to its high-latitude location. C3S, working with the National Science Foundation to upgrade & expand the existing off-continent satellite communications (SATCOM) link at McMurdo, will provide 60 Mbps of bandwidth outbound from McMurdo and 20 Mbps inbound to those missions. The 1st major upgrade milestone (2008) increased the bandwidth from 3 Mbps to/from Antarctica to 10 Mbps. Additionally, Raytheon’s C3S is upgrading the network infrastructure at both McMurdo and the Belrose Earth Station, Australia SATCOM site to provide routing support for several missions, as well as expansion capabilities to support future missions at McMurdo. The upgrade completes in early 2011 to support new downlink capabilities called the ‘McMurdo Multimission Communications System.’ The big increase of available bandwidth to/from McMurdo allows more polar-orbiting environmental/weather satellite missions to use McMurdo as a 2nd downlink site. Two added missions, European Organisation for the Exploitation of Meteorological Satellites’ (EUMETSAT) MetOp polar system and the NOAA-operated DMSP, will downlink mission data to McMurdo. The NASA McMurdo Ground Station antenna will support the EUMETSAT mission. The NPOESS receptor at McMurdo will be a special dual-band antenna receiving both a NPOESS Ka-Band downlink and DMSP S-Band downlink. These upgrades will support routing data from Antarctica and distribution to each mission’s processing facility via the NPOESS Wide Area Network. The resulting acceleration across the SATCOM link allows each mission’s bandwidth use to vary based on the link usage and requirements. This flexibility ultimately allows the SATCOM link to handle more missions compared to static bandwidth allocations to each individual mission.

Paciaroni, J.; Higgins, C.; Jamilkowski, M. L.

2010-12-01

245

21 CFR 890.3700 - Nonpowered communication system.  

Code of Federal Regulations, 2013 CFR

...AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES PHYSICAL MEDICINE DEVICES Physical Medicine Prosthetic Devices § 890.3700 Nonpowered communication system. (a) Identification....

2013-04-01

246

21 CFR 890.3710 - Powered communication system.  

Code of Federal Regulations, 2013 CFR

...AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES PHYSICAL MEDICINE DEVICES Physical Medicine Prosthetic Devices § 890.3710 Powered communication system. (a) Identification....

2013-04-01

247

Chaotic optical communications using delayed feedback systems  

NASA Astrophysics Data System (ADS)

Chaotic dynamics produced by optical delay systems have interesting applications in telecommunications. Optical chaos can be used to transmit secretly, in real-time, a message between an emitter and a receiver. The noise-like appearance of chaos is used to conceal the message, and the synchronization of the receiver with the chaotic emitter is used to decode the message. This work focuses on the study of two crucial topics in the field of chaotic optical communications. The first topic is the synchronization of chaotic external-cavity laser diodes, which are among the most promising chaotic emitters for secure communications. It is shown that, for edge-emitting lasers, two drastically different synchronization regimes are possible. The regimes differ in terms of the delay time in the synchronization and in terms of the robustness of the synchronization with respect to parameter mismatches between the emitter and the receiver. In vertical-cavity surface-emitting lasers, the two linearly-polarized components of the electric field also exhibit isochronous and anticipating synchronization when the coupling between the lasers is isotropic. When the coupling is polarized, the linearly-polarized component that is parallel to the injected polarization tends to synchronize isochronously with the injected optical field, while the other component tends to be suppressed, but it can also be antisynchronized. The second topic is the analysis of time series produced by optical chaotic emitters subjected to a delayed feedback. First, we verify with experimental data that chaos produced by optical delay systems is highly complex. This high complexity is demonstrated by estimating chaos dimension and entropy from experimental time series and from models of optical delay systems. Second, by analyzing chaotic time series, it is shown that the value of the delay of a single-delay system can always be identified, independently of the type of system used and of its complexity. Unfortunately, an eavesdropper can use this information on the delay value to break the cryptosystem. We propose a new cryptosystem with two delayed feedback loops that increases the difficulty of the delay identification problem.

Locquet, Alexandre

248

Animation of the Origin of the Solar System  

NSDL National Science Digital Library

This animation depicts the solar system forming from an immense rotating cloud of gas and dust called the solar nebula and the planets forming by accumulating material within the swirling currents of the cloud.

Terc, Center F.

249

EHF space systems: Experimental missions for broadband communications  

Microsoft Academic Search

In the last years scientific community has been witness of the growing interest in global EHF satellite systems for broadband communications; these systems can help national and regional telecommunications service operators to provide broadband communications in areas not adequately served by terrestrial systems. In this paper main EHF satellite missions are presented, outlining challenges and future perspectives.

Marina Ruggieri; E rnestina Cianca; Tommaso Rossi; Marco Lucente; Cosimo Stallo; Giuseppe Codispoti; Lamberto Zuliani

2009-01-01

250

Robust Speech Recognition System for Communication Robots in Real Environments  

Microsoft Academic Search

The application range of communication robots could be widely expanded by the use of an automatic speech recognition (ASR) system with improved robustness for noise and for speakers of different ages. In this paper, we describe an ASR system which can robustly recognize speech by adults and children in noisy environments. We evaluate the ASR system in a communication robot

Carlos Toshinori Ishit; Shigeki Matsudatt; Takayuki Kandat; Takatoshi Jitsuhirottt; Hiroshi Ishigurot; Satoshi Nakamuratt; Norihiro Hagita

2006-01-01

251

A novel approach to knowledge-based communication system design  

Microsoft Academic Search

A new approach to assist communication system design at an early stage and at a high level is presented. A knowledge-based design tool for the class of spread spectrum communication systems is described which is capable of providing basic system concepts and design recommendations based on abstract specifications of functional requirements, restrictions, and a set of optimizing criteria. By the

Michael Edrich

1992-01-01

252

Underwater optical communications systems. Part 2: basic design considerations  

Microsoft Academic Search

Acoustic systems may provide suitable underwater communications because sound propagates well in water. However, the maximum data transmission rates of these systems in shallow littoral waters are ~10 kilobits per second (kbps) which may be achieved only at ranges of less than 100 m. Although underwater (u\\/w) wireless optical communications systems can have even shorter ranges due to greater attenuation

J. W. Giles; I. N. Bankman

2005-01-01

253

A Signal Processing System for Underwater Acoustic ROV Communication  

Microsoft Academic Search

A high performance system for communication with untethered underwater vehicles is presented. The system is centered around multiple digital processors which perform a variety of signal processing tasks. The processors are combined into an array using a flexible architecture designed for communication prcessing. A basic system has been tested at 5 kbit\\/sec over the Rayleigh-fading multipath channel in Woods Hole

Lee E. Freitag; J. A. Catipovic

1989-01-01

254

Learning Classifier Systems and Behavioural Animation of Virtual Characters  

Microsoft Academic Search

Producing intuitive systems for the directing of virtual actors is one of the major objectives of research in virtual animation.\\u000a So, it is often interesting to conceive systems that enable behavioral animation of autonomous characters, able to correctly\\u000a fulfill directives from a human user considering their goal and their perception of the virtual environment. Common ways to\\u000a generate behaviors of

Stéphane Sanchez; Hervé Luga; Yves Duthen

2006-01-01

255

A Colorization Based Animation Broadcast System with Traitor Tracing Capability  

Microsoft Academic Search

Distributing video contents via broadcasting network mechanisms has become a promising business opportunity for the entertainment\\u000a industry. However, since content piracy is always a serious problem, broadcasted contents must be adequately protected. Rather\\u000a than implementing sophisticate key-management schemes for access control, an animation broadcast system based on colorization\\u000a techniques is proposed. In the proposed system, gray-level animation video sequences are

Chih-chieh Liu; Yu-feng Kuo; Chun-hsiang Huang; Ja-ling Wu

2006-01-01

256

DOLPHIN for inter-vehicle communications system  

Microsoft Academic Search

Inter-vehicle communications (IVC) technology for group cooperative driving has been studied by the Association of Electronic Technology for Automobile Traffic and Driving (JSK) since 1980 in Japan. The study of the IVC technology has been focussed on the communication protocol. This paper proposes DOLPHIN (dedicated omni-purpose inter-vehicle communication linkage protocol for highway automation) and presents its performance evaluation results

K. Tokuda; M. Akiyama; H. Fujii

2000-01-01

257

Advanced integrated WDM system for POF communication  

NASA Astrophysics Data System (ADS)

Polymer Optical Fibres (POFs) show clear advantages compared to copper and glass fibres. In essence, POFs are inexpensive, space-saving and not susceptible to electromagnetic interference. Thus, the usage of POFs have become a reasonable alternative in short distance data communication. Today, POFs are applied in a wide number of applications due to these specific advantages. These applications include automotive communication systems and in-house-networks. State-of-the-art is to transmit data with only one channel over POF, this limits the bandwidth. To solve this problem, an integrated MUX/DEMUX-element for WDM over POF is designed and developed to use multiple channels. This integration leads to low costs, therefore this component is suitable for mass market applications. The fundamental idea is to separate the chromatic parts of the light in its monochromatic components by means of a grating based on an aspheric mirror. Due to the high NA of the POF the setup has to be designed in a 3D-approach. Therefore this setup cannot be compared with the planar solutions available on market, they would result high losses in the 3rd dimension. To achieve a fast and optimized design an optical simulation program is used. Particular attention has to be paid to the design of the POF as a light source in the simulation program and the optimisation of the grating. The following realization of the demultiplexer is planed to be done with injection molding. This technology offers easy and very economical processing. These advantages make this technology first choice for optical components in the low-cost array.

Haupt, M.; Fischer, U. H. P.

2009-01-01

258

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

259

RFID for Cattle Traceability System at Animal Checkpoint  

Microsoft Academic Search

Healthy living style generates the demand for high quality of food. However, traceability system across the supply chain is still facing many challenges from technical perspectives. This paper aims to study the feasibility of traceability system at the government animal checkpoint and how UHF-radio frequency identification (RFID) technology can be deployed for enabling such system. UHF-RFID technical approach faces many

U. Ketprom; C. Mitrpant; P. Makhapun; S. Makwimanloy; S. Laokok

2011-01-01

260

Using Grazing Animals to Restore Resilience in our Agricultural Systems  

Microsoft Academic Search

A key feature of agricultural intensification has been specialization in crop and livestock production in monoculture systems that capture economies of scale and have contributed to increased animal and plant production. Concerns are growing over the ability to maintain long-term intensive monoculture agriculture and increasingly, these systems are recognized as extracting a non-sustainable environmental cost. Such systems are also more

Vivien Gore Allen; Charles Philip Brown

2006-01-01

261

Rapid Polarization Activity in Optical Communication Systems  

NASA Astrophysics Data System (ADS)

We have recently analyzed the high-speed polarization and polarization-mode-dispersion (PMD) transients associated with mechanical impacts on a dispersion compensation module consisting of several km of optical fiber. These generate in our experiments rotational frequencies of up to several hundred radians/sec on the Poincare sphere that can severely degrade the performance of both standard and non-conventional communications systems. Accordingly, we implemented several procedures for performing high-speed polarization measurements, employed these to analyze small and large amplitude excitations and compared the results with a heuristic fiber model. Theoretically, we extended our previous work on applying the Magnus expansion to the analysis of the dependence of the PMD and polarization-dependent-loss (PDL) on frequency. From these, we obtained simple procedures for modeling polarization behavior over a wide frequency range from a small number of experimental measurements. Finally, we analyzed the applicability of various models of stochastic time-dependent refractive index variations to system outage prediction.

Yevick, David; Reimer, Michael; Soliman, George

2010-03-01

262

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

263

Human body communication system with FSBT  

Microsoft Academic Search

There are some leakage radiations from human body depending on incoming signals to it. As there are many noises in the frequency band spanning several MHz, human body communication (HBC), which is a technique to transfer various information through the human body as a communication channel, requires a limitation of frequencies and data rates to support a reliable network that

Hyung-il Park; In-gi Lim; Sungweon Kang; Whan-woo Kim

2010-01-01

264

Single Switch Chinese Phonetic Communication System  

Microsoft Academic Search

Morse code, with its single switch operation, has been shown to be an excellent adaptive communication device for the disabled, especially those with impaired hand coordination and dexterity. Because a stable typing rate is required for an accurate rec- ognition of Morse code, it presents a major hindrance to disabled persons in applying Morse code as a useful communication tool.

Cheng-hong Yang; Cheng-huei Yang; Li-yeh Chuang; Ching-hsing Luo

2002-01-01

265

Electromagnetic compatibility problems in mobile communication systems  

Microsoft Academic Search

Summary form only given, as follows. Personal wireless communication services are considered as a subset technology of the information age. They have gained importance and visibility over the 1990s, and future technological advancements in this field will be unprecedented. As the thrust into wireless personal communication continues with more advanced and compact technologies the risks increase of \\

D. C. Pande

1999-01-01

266

An integrated, underwater optical \\/acoustic communications system  

Microsoft Academic Search

Communication underwater is severely limited when compared to communications in air because water is essentially opaque to electromagnetic radiation except in the visible band. Even in the visible band, light penetrates only a few hundred meters in the clearest waters and much less in waters made turbid by suspended sediment or high concentrations of marine life. Consequently, acoustic techniques have

N. Farr; A. Bowen; J. Ware; C. Pontbriand; M. Tivey

2010-01-01

267

Talk to the Virtual Hands: Self-Animated Avatars Improve Communication in Head-Mounted Display Virtual Environments  

Microsoft Academic Search

BackgroundWhen we talk to one another face-to-face, body gestures accompany our speech. Motion tracking technology enables us to include body gestures in avatar-mediated communication, by mapping one's movements onto one's own 3D avatar in real time, so the avatar is self-animated. We conducted two experiments to investigate (a) whether head-mounted display virtual reality is useful for researching the influence of

Trevor J. Dodds; Betty J. Mohler; Heinrich H. Bülthoff; Manos Tsakiris

2011-01-01

268

Bonneville Power Administration Communication Alarm Processor expert system:  

SciTech Connect

This report describes the Communications Alarm Processor (CAP), a prototype expert system developed for the Bonneville Power Administration by Oak Ridge National Laboratory. The system is designed to receive and diagnose alarms from Bonneville's Microwave Communications System (MCS). The prototype encompasses one of seven branches of the communications network and a subset of alarm systems and alarm types from each system. The expert system employs a backward chaining approach to diagnosing alarms. Alarms are fed into the expert system directly from the communication system via RS232 ports and sophisticated alarm filtering and mailbox software. Alarm diagnoses are presented to operators for their review and concurrence before the diagnoses are archived. Statistical software is incorporated to allow analysis of archived data for report generation and maintenance studies. The delivered system resides on a Digital Equipment Corporation VAX 3200 workstation and utilizes Nexpert Object and SAS for the expert system and statistical analysis, respectively. 11 refs., 23 figs., 7 tabs.

Goeltz, R.; Purucker, S.; Tonn, B. (Oak Ridge National Lab., TN (USA)); Wiggen, T. (Oak Ridge Associated Universities, Inc., TN (USA)); MacGregor, D. (MacGregor-Bates, Inc., Eugene, OR (USA))

1990-06-01

269

Awareness-based communication management in the MASSIVE systems  

Microsoft Academic Search

The MASSIVE-1 and MASSIVE-2 distributed virtual environment systems are based on an explicit model of user communication requirements known as the spatial model of interaction; this model addresses the general issue of managing communication in large space-based systems such as DVEs. The goals of the spatial model are to guide the distribution and presentation of information in a way which

Chris Greenhalgh

1998-01-01

270

Ultra-Wideband Multifunctional Communications\\/Radar System  

Microsoft Academic Search

We have designed, simulated, fabricated, and tested an ultra-wideband (UWB) multifunctional communication and radar system utilizing a single shared transmitting antenna aperture. Two surface acoustic wave bandpass chirp filters were used to modulate the radar and communications pulses, generating linear frequency modulation waveforms with opposite slope factors. The system operates at a center frequency of 750 MHz with 500 MHz

George N. Saddik; Rahul S. Singh; Elliott R. Brown

2007-01-01

271

Timing acquisition in ultra-wideband communication systems  

Microsoft Academic Search

The goal of this paper is to highlight the significance of the timing acquisition problem in ultra-wideband (UWB) communication systems and discuss efficient solutions to the problem. We discuss how the distinguishing features of UWB communication systems, such as their wide bandwidth and low transmission power constraints, are responsible for making the acquisition of UWB signals a difficult task. A

Sandeep R. Aedudodla; Saravanan Vijayakumaran; Tan F. Wong

2005-01-01

272

Optical Fiber Feeder for Microcellular Mobile Communication Systems (H-015)  

Microsoft Academic Search

The authors investigate the feasibility of using an optical fiber feeder for microcellular mobile communication systems. The optical feeder enables compact and low-cost base stations, easy radio channel control, and flexible mobile communication systems. Basic transmission characteristics were investigated through optical transmission experiments. Using these results, it is estimated that the optical feeder can transmit 880 telephone channels for digital

Makoto Shibutani; Toshihito Kanai; Watani Domom; Katsumi Emura; Junji Namiki

1993-01-01

273

Potential performance of PLC systems composed of several communication links  

Microsoft Academic Search

We consider data transmission over a bus system composed of several communication links. All users of the system simultaneously receive transmitted signals with different reliabilities depending on their distance from the sender. Two possible ways of organizing communication are analyzed. The first algorithm includes transmission in a few steps, where each step is devoted to a reliable delivery of the

Vladimir B. Balakirsky; A. J. Han Vinck

2005-01-01

274

A New Receiving System of Visible Light Communication for ITS  

Microsoft Academic Search

This paper discusses a new receiving system for visible light communication applied to intelligent transport systems (ITS). We use a light emitting diode (LED) traffic signal as a transmitter that sends information to vehicles that feature a receiver. There are, however, several problems associated with applying visible light communication to the field of ITS. First, we have to transmit information

Toshiki HARA; Shinya Iwasaki; Tomohiro YENDO; Toshiaki FUJII; Masayuki TANIMOTO

2007-01-01

275

Wireless communication systems with-spatial diversity: a volumetric model  

Microsoft Academic Search

This paper presents a novel physical-modeling approach to wireless systems with multiple antennas. The fundamental problem of modeling the communication channel is studied, where the channel consists of a finite spatial volume for transmitting, a finite spatial volume for reception, and an arbitrary set of reflective-scattering bodies. The number of communication modes (or degrees of freedom) for such a system

Leif Hanlen; Minyue Fu

2006-01-01

276

The Cost of Adding Security Services to Group Communication Systems  

Microsoft Academic Search

Numerous applications requiring information delivery from one sender to many receivers are based on a group communication model. Group communication systems are used in industry and military systems where relia- bility and high-availability are required. With the growth of the Internet, the number of applications that can take advantage of a group communicationinfrastructure increased (teleconferences, white-boards, video confer- ences, distributed

Cristina Nita-Rotaru; Yair Amir

2000-01-01

277

Radio-wave propagation for space communications systems  

Microsoft Academic Search

The most recent information on the effects of Earth's atmosphere on space communications systems is reviewed. The design and reliable operation of satellite systems that provide the many applications in space which rely on the transmission of radio waves for communications and scientific purposes are dependent on the propagation characteristics of the transmission path. The presence of atmospheric gases, clouds,

L. J. Ippolito

1981-01-01

278

Physical constraints on acoustic communication in the atmosphere: Implications for the evolution of animal vocalizations  

Microsoft Academic Search

1.Acoustic communication requires not only detection of the signal but also discrimination of differences among signals by the receiver. Attenuation and degradation of acoustic signals during transmission through the atmosphere will impose limits on acoustic communication. Attenuation of sound during atmospheric transmission results primarily from atmospheric absorption, ground attenuation, scattering of a sound beam, and deflection of sound by stratified

R. Haven Wiley; Douglas G. Richards

1978-01-01

279

Defense satellite communications system - Past, present, and future  

NASA Astrophysics Data System (ADS)

This is a critical point in the long history of the Defense Satellite Communications System. This workhorse communications system has developed from the humble beginnings in the 1960s into today's highly capable backbone of U.S. Government Communications. After a long delay these satellites are being launched again and plan to quickly rebuild this critical national asset which has been held together by determination and sweat following the Challenger disaster. The critical issue is what services shall DSCS provide in the future. The process of defining the SHF communications capability of the next generation of these satellites to support the military needs of the next century is under way.

Cook, Robert G.

1992-03-01

280

Trends in Global Nitrous Oxide Emissions from Animal Production Systems  

Microsoft Academic Search

Wastes from animal production systems contribute as much as 30–50% to the global N2O emissions from agriculture, but relatively little attention has been given on improving the accuracy of the estimates and on developing mitigation options. This paper discusses trends and uncertainties in global N2O emission from animal waste and discusses possible mitigation strategies, on the basis of literature data

Oene Oenema; Nicole Wrage; Gerard L. Velthof; Jan Willem van Groenigen; Jan Dolfing; Peter J. Kuikman

2005-01-01

281

Animating an interactive conversational character for an educational game system  

Microsoft Academic Search

Within the framework of the project NICE (Natural Interactive Communication for Edutainment) [2], we have been developing an educational and entertaining computer game that allows children and teenagers to interact with a conversational character impersonating the fairy tale writer H.C. Andersen (HCA). The rationale behind our system is to make kids learn about HCA's life, fairy tales and historical period

Andrea Corradini; Manish Mehta; Niels-Ole Bernsen; Marcela Charfuelan

2005-01-01

282

LAN based data communication in modern energy management systems (EMS)  

SciTech Connect

The use of energy management systems (EMS) demands high reliability, real-time behavior and more and more economical systems. The last demand requires use of inexpensive standard components, whenever possible. The following article discusses realization of EMS, especially system communication, with respect to these constraints. Problems due to conventional use of standardized communication protocols in distributed supervisory systems in general and highly-reliable systems in particular are shown. Multicast communication concepts are presented as solutions, using standardized protocols in a problem specific way. The presented concepts fulfill the necessity of using standard components as well as the specific demands towards EMS.

Dieterle, W.; Kochs, H.D. [Univ. of Duisburg (Germany). Dept. of Computer Science; Dittmar, E. [ABB Netzleittechnik Gmbh, Ladenburg (Germany)

1996-02-01

283

The ESA technological development activity for domestic communications satellite systems  

NASA Astrophysics Data System (ADS)

Domestic and rural satellite communications, when compared to more traditional satellite systems such as Intelsat and Eutelsat, present different system requirements which result in different technological solutions both for the space segment and the ground segment. In view of preparing European industry to be competitive in an international 'Call for Tenders' expected for such systems, especially from less developed countries, the European Space Agency started in 1982 a program of technological development of specific components, subsystems, and systems described in this communication. After introducing background concepts of Domestic Communication Satellite Systems, the article reviews the technological developments in both the space segment and the earth segment.

Bichi, A. F.

1986-10-01

284

Expression systems and species used for transgenic animal bioreactors.  

PubMed

Transgenic animal bioreactors can produce therapeutic proteins with high value for pharmaceutical use. In this paper, we compared different systems capable of producing therapeutic proteins (bacteria, mammalian cells, transgenic plants, and transgenic animals) and found that transgenic animals were potentially ideal bioreactors for the synthesis of pharmaceutical protein complexes. Compared with other transgenic animal expression systems (egg white, blood, urine, seminal plasma, and silkworm cocoon), the mammary glands of transgenic animals have enormous potential. Compared with other mammalian species (pig, goat, sheep, and cow) that are currently being studied as bioreactors, rabbits offer many advantages: high fertility, easy generation of transgenic founders and offspring, insensitivity to prion diseases, relatively high milk production, and no transmission of severe diseases to humans. Noticeably, for a small- or medium-sized facility, the rabbit system is ideal to produce up to 50 kg of protein per year, considering both economical and hygienic aspects; rabbits are attractive candidates for the mammary-gland-specific expression of recombinant proteins. We also reviewed recombinant proteins that have been produced by targeted expression in the mammary glands of rabbits and discussed the limitations of transgenic animal bioreactors. PMID:23586046

Wang, Yanli; Zhao, Sihai; Bai, Liang; Fan, Jianglin; Liu, Enqi

2013-03-17

285

Expression Systems and Species Used for Transgenic Animal Bioreactors  

PubMed Central

Transgenic animal bioreactors can produce therapeutic proteins with high value for pharmaceutical use. In this paper, we compared different systems capable of producing therapeutic proteins (bacteria, mammalian cells, transgenic plants, and transgenic animals) and found that transgenic animals were potentially ideal bioreactors for the synthesis of pharmaceutical protein complexes. Compared with other transgenic animal expression systems (egg white, blood, urine, seminal plasma, and silkworm cocoon), the mammary glands of transgenic animals have enormous potential. Compared with other mammalian species (pig, goat, sheep, and cow) that are currently being studied as bioreactors, rabbits offer many advantages: high fertility, easy generation of transgenic founders and offspring, insensitivity to prion diseases, relatively high milk production, and no transmission of severe diseases to humans. Noticeably, for a small- or medium-sized facility, the rabbit system is ideal to produce up to 50?kg of protein per year, considering both economical and hygienic aspects; rabbits are attractive candidates for the mammary-gland-specific expression of recombinant proteins. We also reviewed recombinant proteins that have been produced by targeted expression in the mammary glands of rabbits and discussed the limitations of transgenic animal bioreactors.

Wang, Yanli; Zhao, Sihai; Bai, Liang; Fan, Jianglin; Liu, Enqi

2013-01-01

286

Antenna systems with embodied cognition for next generation wireless communications  

Microsoft Academic Search

In this contribution, the embodied cognition antenna system has been introduced as a possible approach to design an efficient communication system operating in a wide set of scenarios. Some results obtained in a practical application have been shown.

Marco Briasco; Andrea F. Cattoni; Giacomo Oliveri; Marina Ottonello; Mirco Raffetto; Carlo S. Regazzoni

2007-01-01

287

47 CFR 90.465 - Control of systems of communication.  

Code of Federal Regulations, 2010 CFR

...control point or control station, control may be exercised...control point or control station. In mobile-only systems...the mobile operator. In communication systems involving multiple base stations or fixed relays...

2010-10-01

288

47 CFR 90.465 - Control of systems of communication.  

Code of Federal Regulations, 2010 CFR

...control point or control station, control may be exercised...control point or control station. In mobile-only systems...the mobile operator. In communication systems involving multiple base stations or fixed relays...

2009-10-01

289

Communication and Control in an Integrated Manufacturing System.  

National Technical Information Service (NTIS)

Typically, components in a manufacturing system are all centrally controlled. Due to possible communication bottlenecking, unreliability, and inflexibility caused by using a centralized controller, a new concept of system integration called an Integrated ...

K. G. Shin R. D. Throne Y. K. Muthuswamy

1987-01-01

290

A wireless electroencephalogram telemetry recording system for roaming animals  

Microsoft Academic Search

A wireless portable electroencephalogram (EEG) recording system for animals is designed, manufactured and then tested in a rat. The system basically consists of four modules: 1) EEG collecting module with the wireless transmitter and receiver (designed by NRF24LE1), 2) filter bank consisting of preamplifier, band pass filter and 50 Hz trapper, 3) power management module and 4) display interface for

Dian Zhang; Xin Gao; Dong Chuan Yu

2011-01-01

291

Communication satellite system beyond the year 2000  

NASA Astrophysics Data System (ADS)

The primary evolutionary factors of satellite communications technologies are reviewed based on the results of a study of novel satellite developments. A critical evaluation of the viability and availability of the technologies is utilized in conjunction with market forecasts to determine promising commercial strategies. Modern technologies are almost prepared for the development of a class of communications satellites and include bandwidth utilization, spacecraft bus modularity, and functional integration.

Robertson, G. J.; Fourquet, J. M.

1991-10-01

292

Effects on Communicative Requesting and Speech Development of the Picture Exchange Communication System in Children with Characteristics of Autism  

Microsoft Academic Search

Few studies on augmentative and alternative communication (AAC) systems have addressed the potential for such systems to impact word utterances in children with autism spectrum disorders (ASD). The Picture Exchange Communication System (PECS) is an AAC system designed specifically to minimize difficulties with communication skills experienced by individuals with ASD. The current study examined the role of PECS in improving

Jennifer B. Ganz; Richard L. Simpson

2004-01-01

293

PM: An Operating System Coordinated High Performance Communication Library  

Microsoft Academic Search

. We have developed a new communication library, called PM,for the Myrinet gigabit LAN card, that has a dedicated processor andon-board memory to handle a communication protocol. In order to obtainhigh performance communication and support a multi-user environment,we have co-desgined PM, an operating system realized by adaemon process, and the run-time routine for a programming language.Several unique features, e.g., network

Hiroshi Tezuka; Atsushi Hori; Yutaka Ishikawa; Mitsuhisa Sato

1997-01-01

294

A new communication support system employing a tablet computer.  

PubMed

A new communication support system has been developed for assisting elderly people communicating by telephone and e-mail. The system consists of a conventional tablet computer, a computer-telephony interface board, a microphone, a speaker, a telephone line and the Internet. The tablet liquid crystal screen (TLCS) is used as a display device and an entry device, instead of a keyboard. When an elderly person telephones or sends an email, they then choose a communication person from the registered support personnel pictures displayed on the TLCS. The computer dials or sends e-mail, which is directly handwritten on the TLCS. When their home system receives a telephone call or e-mail, the computer displays the calling communication person's picture and name on the TLCS. The elderly person can therefore easily recognize and verify the person. Since this newly-developed communication support system does not employ a keyboard, it is easily operated by elderly persons. PMID:16817640

Minami, Takashi; Ogawa, Hidekuni; Yonezawa, Yoshiharu; Maki, Hiromichi; Hahn, Allen W; Caldwell, W Morton

2006-01-01

295

Spread spectrum communication system with chaotic frequency modulation.  

PubMed

A new spread spectrum communication system utilizing chaotic frequency modulation of sinusoidal signals is discussed. A single phase lock loop (PLL) system in the receiver is used both to synchronize the local chaotic oscillator and to recover the information signal. We study the dynamics of the synchronization process, stability of the PLL system, and evaluate the bit-error-rate performance of this chaos-based communication system. PMID:16252975

Volkovskii, A R; Tsimring, L Sh; Rulkov, N F; Langmore, I

2005-09-01

296

The communications system architecture of the North American Advanced Train Control System  

Microsoft Academic Search

The Advanced Train Control System (ATCS) communications system, which provides for the information flow in the North American ATCS, is presented in the context of the overall ATCS plan. The major components and basic operation of ATCS are described. The features, functions, and connectivity of the nodes in the communication system are defined. The communications system is based on the

D. C. Coll; A. U. H. Sheikh; R. G. Ayers; J. H. Bailey

1990-01-01

297

The transmission link of CAPS navigation and communication system  

NASA Astrophysics Data System (ADS)

The Chinese Area Positioning System (CAPS) is based on communication satellites with integrated capability, which is different from the Global Positioning System (GPS), the International Maritime Satellite Organization (Inmarsat) and so on. CAPS works at C-band, and its navigation information is not directly generated from the satellite, but from the master control station on the ground and transmitted to users via the satellite. The slightly inclined geostationary-satellite orbit (SIGSO) satellites are adopted in CAPS. All of these increase the difficulty in the design of the system and terminals. In this paper, the authors study the CAPS configuration parameters of the navigation master control station, information transmission capability, and the selection of the antenna aperture of the communication center station, as well as the impact of satellite parameters on the whole communication system from the perspective of the transmission link budget. The conclusion of availability of the CAPS navigation system is achieved. The results show that the CAPS inbound communication system forms a new low-data-rate satellite communication system, which can accommodate mass communication terminals with the transmission rate of no more than 1 kbps for every terminal. The communication center station should be configured with a large-aperture antenna (about 10-15 m); spread spectrum communication technology should be used with the spreading gain as high as about 40 dB; reduction of the satellite transponder gain attenuation is beneficial to improving the signal-to-noise ratio of the system, with the attenuation value of 0 or 2 dB as the best choice. The fact that the CAPS navigation system has been checked and accepted by the experts and the operation is stable till now clarifies the rationality of the analysis results. The fact that a variety of experiments and applications of the satellite communication system designed according to the findings in this paper have been successfully carried out confirms the correctness of the study results.

Cui, Junxia; Shi, Huli; Chen, Jibin; Pei, Jun

2009-03-01

298

Technical comparison of several global mobile satellite communications systems  

NASA Astrophysics Data System (ADS)

The era of satellite-based mobile satellite communications (MSC) systems started with the first MARISAT satellite which was launched into a geostationary orbit over the Pacific Ocean in 1976 to provide communications between ships and shore stations. The combination of high cost and unacceptably large equipment has kept the space-based MSC systems from appealing to the wider market of personal mobile communications. The progress made over the last ten years, however, in digital voice processing, satellite technology, and component miniaturization has resulted in the viability of satellite-based mobile satellite communications systems to meet the growing market in personal mobile communications using handsets similar to those currently in use with land-based cellular systems. Three of the more mature LEO/MEO satellite systems are addressed in this paper including GLOBALSTAR, Iridium, and Odyssey. The system architectures of each system are presented along with a description of the satellite and user handset designs and the multiaccess techniques employed. It will be shown that, although a number of similarities exist among the system addressed, each system is unique in a variety of significant design areas. It is concluded that the technical feasibility of satellite-based mobile satellite communications systems seems to be secure. It will be challenging, however, for the vendors to actually develop and deploy these systems in a cost effective, timely, and reliable way that meets a continually evolving set of requirements based upon a rapidly changing technology base.

Comparetto, Gary M.

299

Public perception and risk communication in regard to bioterrorism against animals and plants  

Microsoft Academic Search

Summary This paper examines the total international prohibition on the use of disease to attack humans, animals and plants, noting that in the past several countries had developed programmes for attacks on animals and plants as well as humans. Current activities undertaken by intergovernmental organisations - the World Health Organization (WHO), Food and Agricultural Organization (FAO) and World Organisation for

G. S. Pearson

2006-01-01

300

622 Mbps High-speed satellite communication system for WINDS  

NASA Astrophysics Data System (ADS)

WINDS is the experimental communications satellite currently under joint development by Japanese Aerospace Exploration Agency (JAXA) and the National Institute of Information and Communications Technology (NICT). The high-speed satellite communication system is very effective for quick deployment of high-speed networks economically. The WINDS will realize ultra high-speed networking and demonstrate operability of satellite communication systems in high-speed internet. NICT is now developing high-speed satellite communication system for WINDS. High-speed TDMA burst modem with high performance TPC error correction is underdevelopment. Up to the DAC on the transmitter and from the ADC on the receiver, all modem functions are performed in the digital processing technology. Burst modem has been designed for a user data rate up to 1244 Mbps. NICT is developing the digital terminal as a user interface and a network controller for this earth station. High compatibility with the Internet will be provided.

Ogawa, Yasuo; Hashimoto, Yukio; Yoshimura, Naoko; Suzuki, Ryutaro; Gedney, Richard T.; Dollard, Mike

2006-07-01

301

System, method and article of manufacture for a mobile communication network utilizing a distributed communication network  

US Patent & Trademark Office Database

A system, method, and article of manufacture are provided for obtaining information on a mobile computing environment utilizing a distributed communication network. A pattern template is generated. This pattern template is stored on a thin client computer. A query is then created on the thin client computer based in part on user input. A network is queried for information utilizing a distributed communication network. A response is then received to the query from the distributed communication network. This response is processed utilizing an application tool on the thin client computer. The response is filtered by the application tool based on the pattern template. Information is then displayed to a user.

Gershman; Anatole Vitaly (Chicago, IL); Swaminathan; Kishore Sundaram (Downers Grove, IL); Meyers; James L. (Chicago, IL); Fano; Andrew Ernest (Evanston, IL)

2001-03-06

302

Adaptive base station antennas for mobile communication systems  

Microsoft Academic Search

There has been a rapid increase in the number of mobile communication users, resulting in an equally rapid need for increased capacity in the networks. Extensive research and development work on advanced base station antennas for mobile communication is in progress at Ericsson. This includes both active and adaptive antenna systems. With the introduction of active antenna products, it is

Bjorn Johannisson

1998-01-01

303

Security Versus Performance Requirements in Data Communications Systems  

Microsoft Academic Search

The research activities in secure computer networks have paid little attention to the tradeoff between security and other quality requirements of the communication service. This paper aims to introduce performance aspects regarding secure computer networks. First, we attempt to quantify the tradeoff between security and performance in secure data communication systems by means of queueing theory. Our second target is

Vasilios Zorkadis

1994-01-01

304

Design and Performance of Horus: A Lightweight Group Communications System  

Microsoft Academic Search

The Horus project seeks to develop a communication system addressing the requirementsof a wide variety of distributed applications. Horus implements the groupcommunications model providing (among others) unreliable or reliable FIFO, causal,or total group multicasts. It is extensively layered and highly reconfigurable allowingapplications to only pay for services they use. This architecture enables groups withdifferent communication needs to coexist in a

Robbert Van Renesse; Takako M. Hickey; Kenneth P. Birman

1994-01-01

305

Light communication systems. Citations from the NTIS data base  

NASA Astrophysics Data System (ADS)

The design, performance, and application of laser, infrared, and visual communication systems are covered in the cited research reports. Transmission and equipment studies for space, atmospheric, and underwater light communication are presented. Topics covered include lasers, fiber optics, signal processing, transmission links, and data transmission. This updated bibliography contains 87 citations, 59 of which are new entries to the previous edition.

Reed, W. E.

1980-09-01

306

A Web-Based Flexible Communication System in Radiology  

Microsoft Academic Search

A web-based system for rapid multidirectional communication has been created in the Radiology department at San Francisco\\u000a General Hospital. The system allows messaging among radiology attendings, residents, and technologists, as well as other members\\u000a of the hospital community, such as Emergency Department physicians and nurses. Instead of being tied to a particular workflow,\\u000a this system provides a flexible communication infrastructure

Alexander Valentine Rybkin; Mark Wilson

307

Secret data communication system using steganography, AES and RSA  

Microsoft Academic Search

The paper introduces a new secret data communication system that employs the usage of two state-of-the art cryptographic algorithms (RSA with asymmetric keys and AES with symmetric key) together with steganography. The joining of these three techniques builds a robust steganography-based communication system capable of withstanding multiple types of attacks, detection and reverse engineering. Our system was designed in a

Septimiu Fabian Mare; Mircea Vladutiu; Lucian Prodan

2011-01-01

308

ATCOM: Automatically Tuned Collective Communication System for SMP Clusters  

SciTech Connect

Conventional implementations of collective communications are based on point-to-point communications, and their optimizations have been focused on efficiency of those communication algorithms. However, point-to-point communications are not the optimal choice for modern computing clusters of SMPs due to their two-level communication structure. In recent years, a few research efforts have investigated efficient collective communications for SMP clusters. This dissertation is focused on platform-independent algorithms and implementations in this area. There are two main approaches to implementing efficient collective communications for clusters of SMPs: using shared memory operations for intra-node communications, and overlapping inter-node/intra-node communications. The former fully utilizes the hardware based shared memory of an SMP, and the latter takes advantage of the inherent hierarchy of the communications within a cluster of SMPs. Previous studies focused on clusters of SMP from certain vendors. However, the previously proposed methods are not portable to other systems. Because the performance optimization issue is very complicated and the developing process is very time consuming, it is highly desired to have self-tuning, platform-independent implementations. As proven in this dissertation, such an implementation can significantly out-perform the other point-to-point based portable implementations and some platform-specific implementations. The dissertation describes in detail the architecture of the platform-independent implementation. There are four system components: shared memory-based collective communications, overlapping mechanisms for inter-node and intra-node communications, a prediction-based tuning module and a micro-benchmark based tuning module. Each component is carefully designed with the goal of automatic tuning in mind.

Meng-Shiou Wu

2005-12-17

309

Forms of Expression for Designing Visual Languages for Animation  

Microsoft Academic Search

We present further steps in our research into visual languages for animation. Animation is a rich mode of communication that is currently accessible to few, because animation systems are complex. Some systems try to make animation simple but put severe limits on users' creative expression. Our field studies are demonstrating that would-be animators need to express animation in a wide

Richard C. Davis; James A. Landay

2005-01-01

310

A novel telemetry system for recording EEG in small animals.  

PubMed

It has become increasingly evident that continuous EEG monitoring is necessary to observe the development of epilepsy in animals, and to determine the effect of drugs on spontaneous seizures. Telemetric recording systems have been increasingly used to monitor EEG in freely moving animals. One challenge faced by such systems is to monitor frequencies above 80Hz continuously for weeks. We present an implantable, 2.4-ml, telemetric sensor that can monitor EEG at 512 samples per second for eight weeks in a freely moving animal. With minor modifications, the same transmitter can operate at higher sample rates with a proportional decrease in operating life. Signal transmission is through bursts of 915-MHz radio power. The burst transmission and several other novel techniques reduce the transmitter's power consumption by two orders of magnitude while allowing 8 transmitters to share the same recording system. The use of radio-frequency transmission permits digitization within the sensor to sixteen-bit resolution, thus eliminating transmission-generated signal noise. The result is a signal with dynamic range 9mV, bandwidth 160Hz, input noise 12?V, and AC power interference less than 1?V. All circuit diagrams are open-source. Data acquisition takes place over the Internet using open-source software that works on multiple operating systems. The resulting system permits long-term, continuous, monitoring of EEG signals, therefore providing continuous and reliable data upon which to base studies of epilepsy in freely moving animals. PMID:21820010

Chang, Pishan; Hashemi, Kevan S; Walker, Matthew C

2011-07-26

311

Capacity Consideration in Reliability Analysis of Communication Systems  

Microsoft Academic Search

This paper presents a simple method for deriving a symbolic reliability expression of some practical systems such as a communication system having fixed channel capacities of its links, a power distribution system having limited power ratings of its power lines, a transport system which might not allow traffic more than a particular value, or a chemical system in which oil

K. K. Aggarwal; Y. C. Chopra; J. S. Bajwa

1982-01-01

312

A polarization shift-keying system for underwater optical communications  

Microsoft Academic Search

A compact and simple setup for testing polarization modulation in the underwater channel is demonstrated. The results from this system compare favorably to a non-polarization modulation system utilizing on-off keying modulation. This system will allow future work to explore using polarization in optical communication systems underwater. The advantages of such systems include ability to monitor the water quality of the

William C. Cox; Brian L. Hughes; John F. Muth

2009-01-01

313

Communication-based positioning systems: past, present and prospects  

NASA Astrophysics Data System (ADS)

This paper reviews positioning systems in the context of communication systems. First, the basic positioning technique is described for location based service (LBS) in mobile communication systems. Then the high integrity global positioning system (iGPS) is introduced in terms of aspects of what it is and how the low Earth orbit (LEO) Iridium telecommunication satellites enhance the global positioning system (GPS). Emphasis is on the Chinese Area Positioning System (CAPS) which is mainly based on commercial geostationary (GEO) communication satellites, including decommissioned GEO and inclined geosynchronous communication satellites. Characterized by its low cost, high flexibility, wide-area coverage and ample frequency resources, a distinctive feature of CAPS is that its navigation messages are generated on the ground, then uploaded to and forwarded by the communication satellites. Fundamental principles and key technologies applied in the construction of CAPS are presented in detail from the CAPS validation phase to its experimental system setup. A prospective view of CAPS has concluded it to be a seamless, high accuracy, large capacity navigation and communication system which can be achieved by expanding it world wide and enhancing it with LEO satellites and mobile base stations. Hence, this system is a potential candidate for the next generation of radio navigation after GPS.

Ma, Guan-Yi; Wan, Qing-Tao; Gan, Tong

2012-06-01

314

The effects of hands-free communication device systems: communication changes in hospital organizations  

PubMed Central

Objective To analyze the effects that hands-free communication device (HCD) systems have on healthcare organizations from multiple user perspectives. Design This exploratory qualitative study recruited 26 subjects from multiple departments in two research sites located in Portland, Oregon: an academic medical center and a community hospital. Interview and observation data were gathered January through March, 2007. Measurements Data were analyzed using a grounded theory approach. Because this study was exploratory, data were coded and patterns identified until overall themes ‘emerged’. Results Five themes arose: (1) Communication access—the perception that HCD systems provide fast and efficient communication that supports workflow; (2) Control—social and technical considerations associated with use of an HCD system; (3) Training—processes that should be used to improve use of the HCD system; (4) Organizational change—changes to organizational design and behavior caused by HCD system implementation; and (5) Environment and infrastructure—HCD system use within the context of physical workspaces. Conclusion HCD systems improve communication access but users experience challenges integrating the system into workflow. Effective HCD use depends on how well organizations train users, adapt to changes brought about by HCD systems, and integrate HCD systems into physical surroundings.

Richardson, Joshua E; Ash, Joan S

2010-01-01

315

Wireless Communications Technology in Telehealth Systems  

Microsoft Academic Search

Telehealth is an inter-disciplinary area and is basi- cally the delivery of health and medical information and services over large and small distances using electronic information and communication technologies. Broadband wireless services available today, along with more powerful and convenient hand- held devices, will enable a transformational change in health management and healthcare with the introduction of real-time ...

Aravind Kailas; Mary Ann Ingram

2007-01-01

316

The Changing System of Scholarly Communication.  

ERIC Educational Resources Information Center

Examines the effects of new technologies on scholarly communications, including changes in scholarly research and writings, the publishing industry, documentation of scholarly works, and users of records of scholarship. The research library's responsibility to collect, preserve, and make available records of scholarship is also discussed. (CLB)

Information Reports and Bibliographies, 1986

1986-01-01

317

Reliable Group Communication in Distributed Systems  

Microsoft Academic Search

The design and implementation of a reliable group communication mechanism is presented. The mechanism guarantees a form of atomicity in that the messages are received by all operational members of the group or by none of them. Since the overhead in enforcing the order of messages is nontrivial, the mechanism provides two types of message transmission: one guarantees delivery of

S. Navaratnam; Samuel T. Chanson; Gerald W. Neufeld

1988-01-01

318

Information Theory, The Copernician System of Communications  

Microsoft Academic Search

IT IS ARGUED that Shannon's theory of information is the scientific basis of commumcataons in the same sense that Copernicus' heliocentric theory is the scientific basis of astronomy. Some parallels between Copernicus and Shannon are drawn. It is further argued that the fundamental thesis of information theory is that all communications is essentially digital and that the main theorem of

James L. Massey

1984-01-01

319

Computerized Biotelemetry System for Environmental Research on Dairy Animals1  

Microsoft Academic Search

A data collection and data analysis system has been developed for monitor- ing animals in typical livestock environ- ments through biotelemetry. The equipment consists of a PDP 11V03 microcomputer interfaced to a telemetry receiver and time interval digitizer. Radio- telemetry provides information on diurnal temperature patterns in dairy cattle at monitoring intervals anywhere from once a minute to once a

C. T. Araki; R. M. Nakamura; G. L. Seawright; R. R. Brown

1984-01-01

320

46 CFR 27.205 - What are the requirements for internal communication systems on towing vessels?  

Code of Federal Regulations, 2010 CFR

...are the requirements for internal communication systems on towing vessels...are the requirements for internal communication systems on towing vessels...are not required to have internal communication systems. (c)...

2010-10-01

321

46 CFR 27.205 - What are the requirements for internal communication systems on towing vessels?  

Code of Federal Regulations, 2010 CFR

...are the requirements for internal communication systems on towing vessels...are the requirements for internal communication systems on towing vessels...are not required to have internal communication systems. (c)...

2009-10-01

322

75 FR 8400 - In the Matter of Certain Wireless Communications System Server Software, Wireless Handheld...  

Federal Register 2010, 2011, 2012, 2013

...Wireless Communications System Server Software, Wireless Handheld Devices and Battery Packs; Notice...wireless communications system server software, wireless handheld devices and battery packs by...wireless communications system server software, wireless handheld devices or battery packs...

2010-02-24

323

Synchronization of APIIS based farm animal biodiversity systems  

PubMed Central

One of the major problems in the management of farm animal and biodiversity information is the exchange of data and keeping it up-to-date, an issue that is very common with distributed information systems consisting of number of databases. This article describes the synchronization protocol developed in APIIS (adaptable platform independent information system) framework and reviews the basic considerations required when building distributed information system that has to exchange information in a network of APIIS based systems. The protocol is designed to synchronize a common part of different database structures. It is developed without any intended use of proprietary database engine and can work with a variety of RDBMS (relational database management system). The main targets of the protocol are animal biodiversity information systems without permanently connected nodes. The EFABIS (European farm animal biodiversity information system) is reviewed as an example of the implementation. Availability The synchronization protocol is integrated as a part of the APIIS framework, which is freely available from the authors.

Duchev, Zhivko; Groeneveld, Eildert

2006-01-01

324

Towards communication network development (structural systems issues, combinatorial models)  

Microsoft Academic Search

This paper focuses on systems development issues (i.e., improvement, extension) for composite (modular) systems. First, systems approaches are considered: (a) improvement of systems components and\\/or their interconnections, (b) improvement\\/extension of a system structure, (c) “space” (e.g., geographical) extension of a system as designing an additional system part, and (d) combined system improvement\\/extension. Communication networks are examined as a basic applied

M. S. Levin; Russian Acad

2010-01-01

325

Protocol for Secure Communication in Large Distributed Systems.  

National Technical Information Service (NTIS)

A mechanism for secure communication in large distributed systems is proposed. The mechanism, called Authenticated Datagram Protocol (ADP), provides message authentication and, optionally, privacy of data. ADP is a host-to-host datagram protocol, position...

D. P. Anderson D. Ferrari P. V. Rangan B. Sartirana

1987-01-01

326

Stabilization of Networked Control Systems Under Feedback-based Communication.  

National Technical Information Service (NTIS)

We study the stabilization of a networked control system (NSC) in which multiple sensors and actuators of a physical plant share a communication medium to exchange information with a remote controller. The plant's sensors and actuators are allowed only li...

L. Zhang D. Hristu-Varsakelis

2004-01-01

327

Joint Adaptive Communications System (JACS) Concept Validation Study.  

National Technical Information Service (NTIS)

The Concept Validation Study of Joint Adaptive Communication System (JACS), conducted by David Sarnoff Research Center (Sarnoff) under contract to Air Force, focused on evaluation of network algorithms for a self-organizing, self-routing, self-maintaining...

N. P. Newman T. Stiller W. E. Stephens

1997-01-01

328

National Science Foundation Division Plan: Electrical, Communications and Cyber Systems.  

National Technical Information Service (NTIS)

The Division of Electrical, Communications and Cyber Systems (ECCS) of the National Science Foundation (NSF) addresses fundamental research issues underlying device and component technologies, power and energy, controls, computation, networks, communicati...

U. Varshney

2008-01-01

329

Coast Guard's Boat Crew Communications System Is Unreliable.  

National Technical Information Service (NTIS)

This report addresses the effectiveness of the Coast Guard's boat crew communications system to support maritime operations. We conducted this work as part of our audit to determine whether the current Maritime Safety and Security Team (MSST) program and ...

2010-01-01

330

Compressed Sensing Based Ultra-Wideband Communication System.  

National Technical Information Service (NTIS)

Sampling is the bottleneck for ultra-wideband (UWB) communication. Our major contribution is to exploit the channel itself as part of compressed sensing, through waveformbased pre-coding at the transmitter. We also have demonstrated a UWB system baseband ...

B. M. Sadler P. Zhang R. C. Qiu Z. Hu

2009-01-01

331

Quadratic-Exponential Moment Error Bounds for Digital Communication Systems.  

National Technical Information Service (NTIS)

By utilizing the theory of moment spaces, upper and lower bounds to error probability of digital communication systems, based on the use of quadratic-exponential moments of the intersymbol interference random variables, are obtained. Some bounds can be ev...

K. Yao

1976-01-01

332

Army Communications Objectives Measurement System (ACOMS): Survey Analysis Plan.  

National Technical Information Service (NTIS)

This is the second of two design reports that document the plans for the Army Communications Objectives Measurement System (ACOMS). This report discusses the general plan to analyze youth and parent survey data and specific plans by topic: tracking respon...

G. H. Gaertner T. W. Elig

1988-01-01

333

Structuring computer-mediated communication systems to avoid information overload  

Microsoft Academic Search

Unless computer-mediated communication systems are structured, users will be overloaded with information. But structure should be imposed by individuals and user groups according to their needs and abilities, rather than through general software features.

Starr Roxanne Hiltz; Murray Turoff

1985-01-01

334

ELF Communications System Ecological Monitoring Program: Upland Flora Studies.  

National Technical Information Service (NTIS)

The U.S. Navy has completed a program monitoring flora, fauna, and ecological relationships for possible effects from electromagnetic (EM) fields produced by its Extremely Low Frequency (ELF) Communications System. This report documents studies of upland ...

E. A. Jones G. D. Mroz M. F. Jurgensen M. R. Gale P. J. Cattelino

1994-01-01

335

Queueing Models for Designing Digital Communication Satellite Systems.  

National Technical Information Service (NTIS)

Satellites have an enormous potential for providing efficient communication links between many widely scattered ground stations. By interpreting the messages as customers in a queueing system, an unusual type of queueing model can be formulated to describ...

F. S. Hillier B. Jabbari

1982-01-01

336

Field Demonstrations of Communication Systems for Distribution Automation.  

National Technical Information Service (NTIS)

The Electric Power Research Institute and the US Department of Energy have completed a jointly sponsored program to develop and test communication systems for distribution automation and load management. This program included three power-line-carrier proj...

V. T. Rhyne

1982-01-01

337

Research of a portable atmospheric laser communication system  

NASA Astrophysics Data System (ADS)

A kind of portable atmosphere laser communication system based on fiber technology is designed by using Ethernet transceiver terminal and video-audio transceiver terminal with diode laser module and PIN diode, while a flexible connection is built between the terminal and the optical antenna connected by laser fiber. The application of EDFA technology, which realizes the amplification of the power of the 1550nm laser diode module, brings forth a more stable structure and easier deployment and testing in wild environment, and the communication distance can reach 2 kilometers with a transmission bandwidth of 100 MBit/s. Prototype experiments prove the good communication performance of this system.

Zeng, Wen-feng; Li, Dong; Li, Shen-peng; Tan, Wei; Yi, Zhigang

2013-08-01

338

A Geometrical Study of Transmitted Reference Communication Systems  

Microsoft Academic Search

Digital communication systems utilizing wide-band carriers require a coherent reference for optimal data processing. This reference may be either locally generated or transmitted simultaneously with the data. The latter system completely avoids the synchronization problem of locally generated reference systems but is degraded by the fact that two receivers are required, excess system dimension must be used, and the transmitter

R. Gagliardi

1964-01-01

339

Secure Communications System Through Concurrent AJ and LPD Evaluation  

Microsoft Academic Search

In this paper, a systematic approach and their corresponding metrics for concurrent anti-jamming (AJ) and low probability\\u000a of detection (LPD) performance evaluations of a secure communications system are investigated. In general, it is necessary\\u000a to deal simultaneously with adversary threats of both active jamming and passive detection for a secure communications system\\u000a concern. For independent or concurrent AJ and LPD

Chien-Hsing Liao; Mu-King Tsay; Ze-Shin Lee

2009-01-01

340

Installation of the fiber optic communications underwater system (FOCUS)  

Microsoft Academic Search

The fiber optic communication underwater system (FOCUS) replaces the microwave communication system linking the Naval Air Warfare Center-Weapons Division Point Mugu facility with their San Nicolas Island (SNI) facility. The MariPro operation of Science Applications International Corporation (SAIC\\/MariPro) was the prime contractor and performed all engineering; furnishing of equipment and installation (EF&I) tasks. The FOCUS will eventually consist of additional

R. Polley; P. B. Yinger

1993-01-01

341

IRECIN Nano-satellite communication system and ground segment  

Microsoft Academic Search

On board resources necessary to perform the mission tasks are very limited in nano-satellites. This paper proposes a real-time multi-processing system for the communication system between ground segment and IRECIN nano-satellite.The first microprocessor is devoted to interface to the rice-transceiver subsystem decoding packet information and the second one is in charge to communicate with the other subsystems through I2C bus.

M. Ferrante; M. Povia; L. Di Ciolo; A. Ortenzi; M. Petrozzi

2005-01-01

342

Communications.  

National Technical Information Service (NTIS)

Communication in its many forms is a critical component for an effective Space Grant Program. Good communication is needed within individual Space Grant College/Consortia, for example between consortium affiliates and the consortium program office. Effect...

D. D. Stouffer

1990-01-01

343

A Peer-to-Peer Communication System  

Microsoft Academic Search

The demand of communicating anywhere, anytime on any device is growing with the development of modern information technology.\\u000a Current instant messaging services enable people to be aware of each other’s presence and to exchange text information. However,\\u000a almost all of these services are based on client\\/server architecture. If servers crash, all connections are lost. As an alternative,\\u000a peer-to-peer architecture basically

Yong Li; Jiang Li; Keman Yu; Kaibo Wang; Shipeng Li; Ya-qin Zhang

2002-01-01

344

Baseband system for human body channel communication  

Microsoft Academic Search

Biomedical sensor research is moving towards portable, wearable and implantable designs. Human body communication (HBC) is a promising data transmission method for low-power and high-speed biomedical sensors. Using the conductive human body as transmission medium, HBC trials has significant potential applications for personal healthcare and sports performance. The human body channel investigation identifies an optimum channel bandwidth of 1MHz to

Lin-hua Zhang; Xin-zhuo Liu; Jin Huang; Lei Wang

2010-01-01

345

Wireless communications technology in telehealth systems  

Microsoft Academic Search

Telehealth is an inter-disciplinary area and is basically the delivery of health and medical information and services over large and small distances using electronic information and communication technologies. Broadband wireless services available today, along with more powerful and convenient hand-held devices, will enable a transformational change in health management and healthcare with the introduction of real-time monitoring and timely responses

Aravind Kailas; Mary Ann Ingram

2009-01-01

346

Subsea wellhead with annulus communicating system  

SciTech Connect

This patent describes a subsea wellhead. It comprises: a wellhead housing having an interior surface, an upper surface and a landing seat at the lower end of the inner surface, a series of hangers landed within the wellhead housing, each of the hangers having an exterior sealing surface and a series of seal assemblies having a seal for sealing between the exterior sealing surface of a hanger and the interior surface of the wellhead housing. The sealing of the seal assemblies providing a plurality of annuli between the hangers and the wellhead housing, a plurality of passages in the wellhead housing communicating from the upper surface of the wellhead housing to the annuli with each of the passages communicating with a single one of the annuli, means associated with the passages for isolating the annuli from each other and to prevent flow from one annulus into another, and means for communicating fluid pressure changes at the upper surface of the wellhead housing to the surface.

Hynes, J.H.

1990-01-01

347

A silicon early visual system as a model animal.  

PubMed

Examples that show the transfer of our basic knowledge of brain function into practical electronic models are rare. Here we present a user-friendly silicon model of the early visual system that contributes to animal welfare. The silicon chip emulates the neurons in the visual system by using analog Very Large Scale Integration (aVLSI) circuits. It substitutes for a live animal in experiment design and lecture demonstrations. The neurons on this chip display properties that are central to biological vision: receptive fields, spike coding, adaptation, band-pass filtering, and complementary signaling. Unlike previous laboratory devices whose complexity was limited by the use of discrete components on printed circuit boards, this battery-powered chip is a self-contained patch of the visual system. The realistic responses of the chip's cells and the self-contained adjustment-free correct operation of the chip suggest the possibility of implementation of similar circuits for visual prosthetics. PMID:15149839

Delbrück, Tobi; Liu, Shih-Chii

2004-01-01

348

Integrated communication/environmental controller system for the physically disabled.  

PubMed

A wireless integrated communication/environmental controller system (ICECS) is described, which offers total communication as well as environmental control for the disabled person. The system is flexible and simple enough to be used from the wheelchair by patients with spinal cord injuries. The system has three parts: the mobile unit, the base unit, and a set of remote-control receiver modules. The mobile unit and the base unit are linked together by radio, while the base unit and the remote receiver modules communicate over a power line carrier. The telephone mode allows telephone calls to be placed and received. Different electrical devices are controlled by the environmental control mode. The intercom mode permits two-way communication with an attendant or the nursing station. The modes can be switched simply by pressing a button on the mobile unit. Sixteen soft-touch switches arranged in a 4 X 4 matrix allow operation by hand or mouthstick. PMID:2950838

Fatehi, M T; Balmaseda, M T; Koozekanani, S H

1987-03-01

349

DOE Integrated Security System (DISS) preliminary communication security analysis  

SciTech Connect

The purpose of this analysis is to document a technical approach to improve DOE Integrated Security System (DISS) dial-up communications security and the requirements to address them. This document is not intended as a comprehensive analysis of the security aspects of the DISS computer system but rather as an analysis of the dial-up communications security as it pertains to the use of the DISS database in the new DOE Automated Visitors Access Control System (DAVACS) procedures. Current access controls into the DISS will be discussed with emphasis on the DAVACS procedures. Recommendations will be provided for increasing the dial-up communications security into DISS as it relates to the automated visit procedures. Finally a design for an encrypted dial-up communication link to DISS will be given.

Sweeney, D.J.

1993-10-01

350

Methods for operating parallel computing systems employing sequenced communications  

DOEpatents

A parallel computing system and method are disclosed having improved performance where a program is concurrently run on a plurality of nodes for reducing total processing time, each node having a processor, a memory, and a predetermined number of communication channels connected to the node and independently connected directly to other nodes. The present invention improves performance of the parallel computing system by providing a system which can provide efficient communication between the processors and between the system and input and output devices. A method is also disclosed which can locate defective nodes with the computing system. 15 figs.

Benner, R.E.; Gustafson, J.L.; Montry, G.R.

1999-08-10

351

A Dynamic System for Personal Communications: The Opportunistic Chat  

Microsoft Academic Search

Most of currently available inter-personal instant messaging systems are client-server based. Users of such systems need to be connected to some centralized entity which goal is to supply them with information needed to make the communication possible, such as the list of connected users, their status, and the address of their devices. Our proposed system for an \\

Salvatore Sorce; Francesco Cinquegrani; Salvatore Maria Anzalone; Dario Caccìa; Antonio Gentile; Alessandro Genco

2007-01-01

352

An Improved Importance Sampling Method for Digital Communication System Simulations  

Microsoft Academic Search

The use of importance sampling techniques can substantially reduce the variance of probability of error estimates obtained by Monte Carlo type simulations of digital communication systems. However, the advantages of importance sampling diminish as the memory length of the system becomes greater. This paper presents a modified importance sampling method which achieves substantial variance reduction for systems with memory.

BRUCE R. DAVIS

1986-01-01

353

Green Power Amplification Systems for 3G+ Wireless Communication Infrastructure  

Microsoft Academic Search

This paper presents an overview of system-level solutions for green wireless communication infrastructure. It illustrates that a combination of high efficiency amplification system with a linearity restoration technique is unavoidable. Currently, Doherty power amplifiers along with digital predistortion technique are able to achieve high power efficiency. However, due to the limited bandwidth of digital predistortion systems (typically 20 MHz), feedforward

Oualid Hammi; Andrew K. C. Kwan; Mohamed Helaoui; Fadhel M. Ghannouchi

2010-01-01

354

Design of Mass Information Communication System Based on MCF52223  

Microsoft Academic Search

To mass data transmission and storage, a USB Mass Information Communication System, based on Freescale's 32-bit MCU - MCF52223, is designed in the paper. The MCF52223 integrates a USB module. The system can access document and data stored in U disk under the circumstance of no-PC. The system includes software part and hardware part. The software part based on the

Dejun Meng; Zhigui Lin; Qingqing Zhong

2011-01-01

355

Parameter optimization of wireless communication system in video surveillance network  

Microsoft Academic Search

Aiming at the more and more serious traffic problem in large cities, this paper proposes a new architecture of urban traffic surveillance system based on the concept of sensor network. Since the speed and quality of communication system has a critical effect on the performance of the overall system, the optimal combination of duty cycle, one of the most important

Xi Shi; Jianming Hu; Jingyan Song; Yangsheng Xu

2005-01-01

356

Social networking for anonymous communication systems: A survey  

Microsoft Academic Search

Anonymous communication systems have been around for sometime, providing anonymity, enhanced privacy, and censorship circumvention. A lot has been done, since Chaum's seminal paper on mix networks, in preventing attacks able to undermine the anonymity provided by these systems. This, however, is goal difficult to achieve due to the de-centralized nature of these systems. In the end it boils down

Rodolphe Marques; Andre Zuquete

2011-01-01

357

Authentication of mobile users in personal communication system  

Microsoft Academic Search

The logical structure of a personal communication system (PCS) is divided into three layers: intelligent layer, transmission layer and access layer. The authentication of mobile users is realized in the intelligent layer. The database structure of the PCS, different from the existing systems such as GSM and IS-41 etc., is centralized. Therefore the authentication schemes used in existing systems cannot

Liu Jianwei; Wang Yumin

1996-01-01

358

Building reliable, high-performance communication systems from components  

Microsoft Academic Search

Although building systems from components has attractions, this approach also has problems. Can we be sure that a certain configuration of components is correct? Can it perform as well as a monolithic system? Our paper answers these questions for the Ensemble communication architecture by showing how, with help of the Nuprl formal system, configurations may be checked against specifications, and

Xiaoming Liu; Christoph Kreitz; Robbert van Renesse; Jason Hickey; Mark Hayden; Kenneth P. Birman; Robert L. Constable

1999-01-01

359

Italsat, an advanced on board processing satellite communication system  

NASA Astrophysics Data System (ADS)

The paper presents the Italsat satellite communication system developed by the Italian Space Agency. The system is based on a regenerative switching satellite payload operating at 20 and 30 GHz. The coverage of the Italian territory is achieved by six spot beams controlled by an antenna fine pointing subsystem. This payload is called multibeam payload. A second communication payload covers Italy with a global beam. This payload has three transparent transponders at 20 and 30 GHz. To establish an operative system a second flight unit is now in production. The launch is expected the end of 1993. The operative system will provide up to 24,000 bidirectional telephone connections.

Marconicchio, F.; Morelli, G.; Valdoni, F.

1992-03-01

360

Chaos-based communication systems in non-ideal channels  

NASA Astrophysics Data System (ADS)

Recently, many chaos-based communication systems have been proposed. They can present the many interesting properties of spread spectrum modulations. Besides, they can represent a low-cost increase in security. However, their major drawback is to have a Bit Error Rate (BER) general performance worse than their conventional counterparts. In this paper, we review some innovative techniques that can be used to make chaos-based communication systems attain lower levels of BER in non-ideal environments. In particular, we succinctly describe techniques to counter the effects of finite bandwidth, additive noise and delay in the communication channel. Although much research is necessary for chaos-based communication competing with conventional techniques, the presented results are auspicious.

Eisencraft, M.; Fanganiello, R. D.; Grzybowski, J. M. V.; Soriano, D. C.; Attux, R.; Batista, A. M.; Macau, E. E. N.; Monteiro, L. H. A.; Romano, J. M. T.; Suyama, R.; Yoneyama, T.

2012-12-01

361

A multibanded system architecture for ultra-wideband communications  

Microsoft Academic Search

The FCC ruling in 2002 allowing for the unlicensed deployment of ultra-wideband (UWB) devices for communications purposes in the 3.1-10.6 GHz band has sparked great interest in the industry. In particular, the IEEE 802.15.3a task group is currently developing a standard for high-rate, short-range wireless communication systems that is expected to use UWB technology. One of the main challenges for

Jefiey R. Foerster; V. Somayazulu; Sumit Roy

2003-01-01

362

Communications-computer systems and plans in Air Combat Command  

Microsoft Academic Search

Air Combat Command (ACC) focused on in the communications-computer (C2) systems arena is discussed. The paper is divided into three sections, the first of which introduces ACC's mission and operational deployments. The second section outlines the health, status and planning challenges of the communications-computer arena, and the last section is an overview of the new direction the Air Force is

1996-01-01

363

Complex network demonstration: Topology of instant communication systems  

Microsoft Academic Search

ICS have become very popular communication tolls nowadays. They can provide instant, multi-directed and multi-types of communications which makes the message spreading in ICS different from those in WWW, Blog and email systems. Groups have great impacts on message spreading in ICS. The research demonstrates the power law distribution of groups in MSN with parameter Upsi ranging from 0.76 to

Qiang Yan; Huaying Shu; Xiaoyan Huang; Xicheng Zhang

2007-01-01

364

Propagation losses for satellite-to-submarine optical communication systems  

Microsoft Academic Search

Water absorption characteristics limit the useable electromagnetic carrier frequencies for underwater communication to either less than a few hundred hertz (ELF) or the blue-green optical wavelengths. This paper considers the case of a satellite-borne blue-green laser transmitter communicating at low data rates to a deeply submerged receiver. One difficulty in designing such a system is the uncertainty in propagation losses.

G. Lee; G. Schroeder; C. Ciany

1978-01-01

365

Improving Literacy Skills in Students with Complex Communication Needs Who Use Augmentative/Alternative Communication Systems  

ERIC Educational Resources Information Center

|A structured intervention package including direct, scaffolded, instructional lessons was implemented using an error correction learning system and a picture book-based phonological and phonemic awareness activity for four participants with complex communication needs, ranging from 12 to 15 years, in a junior high school setting. Although…

Bailey, Rita L.; Angell, Maureen E.; Stoner, Julia B.

2011-01-01

366

Design and realization of communication mechanism of autonomous robot soccer based on multi-agent system  

Microsoft Academic Search

Autonomous robot soccer system consists of a multi-agent system that need to cooperate in unknown, dynamic, and competitive environment. Thus, it is a crucial issue how to realize effective and real time communications among soccer robots. There are three problems need to solve about the communication, they are dialog management, communication language, and communication protocol. Thereinto, communication language is a

Xie Yun; Yang Yiming; Deng Zeming; Liu Bingru; Yi Bo

2003-01-01

367

Engineering of synthetic intercellular communication systems.  

PubMed

The introduction of synthetic devices that provide precise fine-tuning of transgene expression has revolutionized the field of biology. The design and construction of sophisticated and reliable genetic control circuits have increased dramatically in complexity in recent years. The norm when creating such circuits is to program the whole network in a single cell. Although this has been greatly successful, the time will soon come when the capacity of a single cell is no longer adequate. Therefore, synthetic biology-inspired research has started to shift towards a multicellular approach in which specialized cells are constructed and then interconnected, enabling the creation of higher-order networks that do not face the same limitations as single cells. This approach is conceptually appealing in many respects. The fact that overall workload can be easily divided between cells eliminates the problem of limited program capacity of a single cell. Furthermore, engineering of specialized cells will enable a plug-and-play approach in which cells are combined into multicellular consortia depending on the requested task. Recent advances in synthetic biology to implement intercellular communication and multicellular consortia have demonstrated an impressive arsenal of new devices with novel functions that are unprecedented even in engineered single cells. Engineering of such devices have been achieved in bacteria, yeast and mammalian cells, all of which is covered in this review. The introduction of synthetic intercellular communication into the cell engineering toolbox will open up new frontiers and will greatly contribute to the future success of synthetic biology and its clinical applications. PMID:23246522

Bacchus, William; Fussenegger, Martin

2012-12-14

368

Energy-quality system design for in-body communication.  

PubMed

With the explosive development of wireless communication technology, more and more implanted medical devices appear in everyday life. Because of the limited energy resource in implanted devices, the energy-quality wireless system design is the biggest challenge. In this paper, we update our former system level energy model and make it suitable for implantable medical communication system. In the new model, the impacts of human body tissue on the signal transmission are considered. The wireless system energy consumption is minimized by adjusting the digital base-band and RF parameters such as signal bandwidth, peak-to-average ratio (PAR), modulation levels, data rates etc. In the communication quality evaluation, we consider the effects of 1/f noise and the third-order harmonic distortion in addition to normal channel noise. PMID:19963632

Zhang, Yuwei; Li, Ye; Qiao, Dengyu; Zhang, Yuanting

2009-01-01

369

Wavefront sensor alignment and calibration techniques for laser communication systems  

NASA Astrophysics Data System (ADS)

Laser communication systems operate in the presence of strong atmospheric turbulence, affecting communication platform by broadening of the laser footprint, random jitter of the laser beam, and high spatial frequency intensity fluctuations referred to as scintillation. The prediction of the effects induced by the atmospheric turbulence is a crucial task for reliable data transmission. Equipping the lasercom platform with adaptive optics system capable of probing the atmospheric turbulence and generating the data on wave front errors in real time improves performance and extends the range of optical communications systems. Most adaptive optics systems implement wavefront sensors to measure the errors induced by the atmospheric turbulence. Real time analysis of the data received from the wavefront sensor is used for outgoing laser beam compensation significantly improves the lasercom performance. To obtain reliable data, the wavefront sensor needs to be accurately aligned and calibrated. To model the performance of a laser communication system operating in the real world we have developed an outdoor 3.2 km, partially over water, turbulence measurement and monitoring communication link. The developed techniques of wavefront sensor alignment and calibration led to the successful data collection and analysis are discussed in this paper.

Sergeyev, Aleksandr V.; Levin, Eugene; Roggemann, Michael C.

2012-05-01

370

Marco (Medical Record Communications) - System Concept, Design and Evaluation  

PubMed Central

MARCO, an interfacility communication system, has been designed to promote safe relevant health care delivery to the inner city pediatric patient receiving care in a network consisting of Boston City Hospital and its affiliated Neighborhood Health Centers. This application of computer technology to communication of medical information compiled on an individual patient in multiple locations has implications for private group practice as well as other urban networks similar to our own. This paper provides the MARCO system concept, the system design and evaluation of its success after two years of operation.

Moffatt, P. H.; Heisler, B. D.; Mela, W. D.; Alpert, J. J.; Goldstein, H.M.

1978-01-01

371

Research on standardization of vehicle terminals communication protocols in intelligent public traffic system  

Microsoft Academic Search

It is necessary to develop the relevant communication protocol standards to support the construction of intelligent public traffic system. This article first analyzes the status of communication standardization of intelligent public traffic system. Further it introduces the constitution of communication protocol system of intelligent public traffic system. It proposes communication protocol layered model and the protocol constitution content of vehicle

Xiao-kun Wang; Wei-qiang Chen; Xin Liu; Yue-gao Li; San-gang Mu

2011-01-01

372

Communicating Earth System Science Through Exhibitions  

Microsoft Academic Search

The general public's knowledge of earth system science has lagged behind the extraordinary discoveries that scientists are now making. And yet, as can be seen in the daily news, we are constantly confronted with the impacts of Earth's systems. Enhancing the public's understanding of earth system science is vitally important. The Space Science Institute is a national leader in developing

P. B. Dusenbery

2004-01-01

373

Communication synthesis for distributed embedded systems  

Microsoft Academic Search

Designers of distributed embedded systems face many challenges in determining the appropriate tradeoffs to make when defining a system architecture or retargeting an existing design. Communica- tion synthesis, the automatic generation of the necessary software and hardware needed for system components to exchange data, is required to more effectively explore the design space and automate what are very error-prone tasks.

Ross B. Ortega; Gaetano Borriello

1998-01-01

374

Huggy Pajama: a mobile parent and child hugging communication system  

Microsoft Academic Search

Huggy Pajama is a novel wearable system aimed at promoting physical interaction in remote communication between parent and child. This system enables parents and children to hug one another through a novel hugging interface device and a wearable, hug reproducing pajama connected through the Internet. The hugging device is a small, mobile doll with an embedded pressure sensing circuit that

James Keng Soon Teh; Adrian David Cheok; Roshan Lalintha Peiris; Yongsoon Choi; Vuong Thuong; Sha Lai

2008-01-01

375

An overview of limited feedback in wireless communication systems  

Microsoft Academic Search

It is now well known that employing channel adaptive signaling in wireless communication systems can yield large improvements in almost any performance metric. Unfortunately, many kinds of channel adaptive techniques have been deemed impractical in the past because of the problem of obtaining channel knowledge at the transmitter. The transmitter in many systems (such as those using frequency division duplexing)

David James Love; Robert W. Heath Jr.; Vincent K. N. Lau; David Gesbert; Bhaskar D. Rao; Matthew Andrews

2008-01-01

376

An Evaluation of the Amoeba Group Communication System  

Microsoft Academic Search

The Amoeba group communication system has two unique aspects: (1) it uses a sequencer-based protocol with negative acknowledgements for achieving a total order on all group messages; and (2) users choose the degree of fault tolerance they desire. This paper reports on our design de- cisions in retrospect, the performance of the Amoeba group system, and our experiences using the

M. Frans Kaashoek; Andrew S. Tanenbaum

1996-01-01

377

On the analysis and modelling of computer communication systems  

Microsoft Academic Search

As new computer communication systems, such as distributed computer networks or mobile data networks, grow in scale and complexity, the problem of being able to understand and to predict system behaviour becomes increasingly important. To their behaviour analysis we can use both analytical and simulation methods. Principally the application of analytical queuing theory results belongs to the preferred method in

Ivan Hanuliak

2002-01-01

378

Replicated document management in a group communication system  

Microsoft Academic Search

This paper is about the design and implementatbn of a repllwted database that forms the basis for the N&s*gray, communication system The system supports groups of people working on shared sets of donunents and is intended jor use in a perso~l computer network enulronment in which the database servers are 'tarely connected\\

Leonard Kawell Jr.; Steven Beckhardt; Timothy Halvorsen; Raymond Ozzie; Irene Greif

1988-01-01

379

Using deadbands to reduce communication in networked control systems  

Microsoft Academic Search

The most effective way to improve networked control systems (NCSs) performance is to reduce network traffic. By adapting a system to a network configuration, the communication medium is more efficiently used and time-delays are minimized. Adjustable deadbands are explored as a solution to reduce network traffic in NCSs. The stability of deadband control is derived and then verified via simulation.

P. G. Otanez; J. R. Moyne; Dawn M. Tilbury

2002-01-01

380

Creating natural dialogs in the carnegie mellon communicator system  

Microsoft Academic Search

The Carnegie Mellon Communicator system helps users create complex travel itineraries through a conversational interface. Itineraries consist of (multi-leg) flights, hotel and car reser- vations and are built from actual travel informa- tion for North America, obtained from the Web. The system manages dialog using a schema-based approach. Schemas correspond to major units of task information (such as a flight

Alexander I. Rudnicky; Eric H. Thayer; Paul C. Constantinides; Chris Tchou; R. Shern; Kevin A. Lenzo; W. Xu; Alice Oh

1999-01-01

381

Safety conditions verification of communication in distributed control system  

Microsoft Academic Search

The subject of the paper is the presentation of the methodology for automated verification of safety conditions of a fieldbus communication in a distributed control system. The methodology is based on a compositional verification method. The composition of partial specifications constitutes a system specification and proves that it satisfies a safety conditions. The safety conditions are formulated for verification as

Waldemar Mikluszka

2010-01-01

382

A low-power wireless mobile communications system  

Microsoft Academic Search

The paper describes a wireless mobile communication system which employs a high gain electronically steered array antenna connected to a radio receiver at a base station. By using a steerable, narrow beamwidth, high gain antenna pattern, the receiver can detect much weaker signals than receivers connected to conventional fixed pattern antennas. Since this system can detect weaker signals, either the

Steven A. Harbin; B. Keith Rainer

1994-01-01

383

Fault Detection of Computer Communication Networks Using an Expert System  

Microsoft Academic Search

The main objective of this study was to build an expert system for assisting the network administrator in his work of management and administration of the computer communication network. Theory of operation of the proposed expert system depends on using a time series model capable of forecasting the various performance parameters as: delay, utilization and collision frequency. When the expert

Ibrahiem M. M. El Emary

384

The effects of multiplexing on a computer-communications system  

Microsoft Academic Search

A study is made of the way in which asynchronous time division multiplexing changes the stochastic nature of the arrival process from a user to the computer and, consequently, affects the performance of a time-shared computer-communications system. It is concluded that while, for certain values of system parameters, there is noticeable improvement in the performance of the computer (model), in

Charles D. Pack

1973-01-01

385

Communicate!  

ERIC Educational Resources Information Center

|This ten chapter book is designed to provide high school students with an understanding of basic communication processes. The first five chapters include discussions of language development, function, and acquisition in relation to both human and non-human communication. The sixth chapter contains specimen linguistic analyses of speech and…

Chase, Stuart

386

Complex Biological Memory Conceptualized as an Abstract Communication System–Human Long Term Memories Grow in Complexity during Sleep and Undergo Selection while Awake  

Microsoft Academic Search

Biological memory in humans and other animals with a central nervous system is often extremely complex in its organization\\u000a and functioning.A description of memory from the perspective of complex systems may therefore be useful to interpret and understand\\u000a existing neurobiological data and to plan future research. We define systems in terms of communications.A system does not\\u000a include the communication units

Bruce G. Charlton; Peter Andras

387

Development of the optical biopsy system for small experimental animals  

NASA Astrophysics Data System (ADS)

Development of the optical biopsy system for experimental small animals is in progress. A prototype of the system which consists of a miniaturized gastro endoscope unit and Raman probes has been completed by now. The system is developed to study a gastric cancer rat model. The endoscope is 2.5 mm in diameter and is equipped an imaging bundle fiber, illumination fibers, a channel and a mechanism to angle the probe head. The head of the Raman probe comes out through the channel and it is possible to aim the probe to the target watching on the monitor. The endoscope was inserted into the anaesthetized healthy rat under the breathing support. It was successfully observed inside of the stomach of the living rat and measured Raman spectra. The spectrum of blood vessels contains the strong contribution from lipids. The present results demonstrate high potential of the system in the in vivo Raman study using the rat model.

Sato, Hidetoshi; Hattori, Yusuke; Oshima, Yusuke; Komachi, Yuichi; Katagiri, Takashi; Asakura, Toru; Shimosegawa, Toru; Matsuura, Yuji; Miyagi, Mitsunobu; Kanai, Gen'ichi; Ura, Nobuo; Masutani, Koji; Tashiro, Hideo

2006-03-01

388

Adaptive carrier recovery systems for digital data communications receivers  

Microsoft Academic Search

Adaptive or predictive carrier recovery systems, which are essential in high-performance quadrature-amplitude-modulated (QAM) data communications systems to correct for phase jitter and frequency offset, are considered. Analytical and experimental results are presented for two structures that implement a predictive carrier recovery system. These systems, which adapt their structure to match the spectral properties of the impairments, avoid the conflict between

Robert L. Cupo; Richard D. Gitlin

1989-01-01

389

A Broadcast Vehicle to Vehicle Communication System in Railway Environments  

Microsoft Academic Search

Current statistics in railway transportation systems show that the number of accidents is still too high, despite of huge investments in infrastructure-based safety systems. We show that a infrastructure-less cross-layer train-to-train commu- nication system exploiting all characteristics of a pervasive computing system, like direct communication in mobile ad- hoc networks (MANETs), exchange of location and other relevant context information provided

Cristina Rico García; Thomas Strang; Andreas Lehner

2008-01-01

390

Nationwide mobile communication systems, volume 1, chapters 1 thru 4  

NASA Astrophysics Data System (ADS)

This thesis provides a basic understanding of nationwide terrestrial and satellite mobile communications and tracking technologies. Covered are systems currently available and in development. An analysis of user costs is performed for comparison. A more detailed satellite cost/benefit analysis for use by the trucking industry is also presented. Follow-on chapters contain discussions of the basic economic issues faces by satellite system operators and the regulatory history of mobile satellite services. Contained in the appendices are a more detailed discussion of mobile satellite systems and a layman's explanation of communication and navigation technologies. The conclusion presents comments on the possible future direction of these new mobile communication services and makes recommendations for trucking industry use.

Schworer, William Joseph, III

1990-06-01

391

Theater/user-dedicated communications satellite system concept  

NASA Astrophysics Data System (ADS)

The results of an ongoing study of a theater/user-dedicated communications satellite system concept, which would augment the existing satellite systems (DSCS and MILSTAR), are presented. The system attempts to satisfy a user requirement in incremental amounts. The study entails requirements analysis, concept exploration, and cost and risk analysis. User requirements are determined from contact with theater users, from requirements generated by other ongoing studies, and from requirements compiled by US Air Force Space Command. The study defined and evaluated ground and space systems and communications payload concepts. Some of the issues analyzed during the study include system capacity, compatibility, and interoperability with other systems; satellite orbit; constellation size; survivability; responsiveness; and launch options. Communications signal options analyzed were RF frequency, modulation, and link power margins in order to determine system capacity and antijam performance. Command and control concepts and issues were also addressed. A wide variety of potential communications payload concepts that meet the needs of present satellite users were explored, primarily in the SHF and EHF frequency regimes. All payload concepts were evaluated with the intent of minimizing the satellite size, weight, power, risk, and cost.

Bennett, Roger R.

392

Humans mimicking animals: A cortical hierarchy for human vocal communication sounds  

PubMed Central

Numerous species possess cortical regions that are most sensitive to vocalizations produced by their own kind (conspecifics). In humans, the superior temporal sulci (STS) putatively represent homologous voice-sensitive areas of cortex. However, STS regions have recently been reported to represent auditory experience or “expertise” in general rather than showing exclusive sensitivity to human vocalizations per se. Using functional magnetic resonance imaging and a unique non-stereotypical category of complex human non-verbal vocalizations – human-mimicked versions of animal vocalizations – we found a cortical hierarchy in humans optimized for processing meaningful conspecific utterances. This left-lateralized hierarchy originated near primary auditory cortices and progressed into traditional speech-sensitive areas. These results suggest that the cortical regions supporting vocalization perception are initially organized by sensitivity to the human vocal tract in stages prior to the STS. Additionally, these findings have implications for the developmental time course of conspecific vocalization processing in humans as well as its evolutionary origins.

Talkington, William J.; Rapuano, Kristina M.; Hitt, Laura; Frum, Chris A.; Lewis, James W.

2012-01-01

393

Insect sensory systems inspired computing and communications  

Microsoft Academic Search

Insects are the most successful group of living things in terms of the number of species, the biomass and their distribution. Entomological research has revealed that the insect sensory systems are crucial for their success. Compared to human brains, the insect central nerve systems are extremely primitive and simple, both structurally and functionally, and are of minimal learning ability. Faced

Axel W. Krings

2009-01-01

394

Advance Computer Communication Systems in Hybrid Vehicles  

Microsoft Academic Search

This paper presents an overview of advance signal processors and computer systems in present day hybrid vehicles. The increase in processing speeds of the present day digital signal processors has helped in development of hybrid cars at commercial level. Hybrid vehicles make use of computer control systems that are extremely complicated. The recent advances in processing speed and power, the

P. V. Suryavanshi; V. K. Sharma; R. Sharma

2006-01-01

395

Communication Systems for Building Automation and Control  

Microsoft Academic Search

Building automation systems (BAS) provide automatic control of the conditions of indoor environments. The historical root and still core domain of BAS is the automation of heating, ventilation and air-conditioning systems in large functional buildings. Their primary goal is to realize significant savings in energy and reduce cost. Yet the reach of BAS has extended to include information from all

WOLFGANG KASTNER; GEORG NEUGSCHWANDTNER; STEFAN SOUCEK; H. MICHAEL NEWMAN

2005-01-01

396

Design and characteristics of a multiband communication satellite antenna system  

NASA Astrophysics Data System (ADS)

Feasibility studies on a multiband communication satellite antenna system and the key technologies involved in devising this system are described. The proposed multiband communication satellite utilizes four frequency bands: Ka (30/20 GHz), Ku (14/12 GHz), C (6/4 GHz), and S (2.6/2.5 GHz). It has six beam configurations, three multibeam and three shaped-beam. The following key technologies are presented: (1) a low-loss frequency selective subreflector (FSR) for compact feeds, (2) a low-loss and broadband frequency selective surface (FSS), and (3) a highly accurate and reliable mesh reflector.

Ueno, Kenji; Itanami, Takao; Kumazawa, Hiroyuki; Ohtomo, Isao

1995-04-01

397

GPS synchronized UV communication system performance based on USRP  

NASA Astrophysics Data System (ADS)

Recently, Ultraviolet communication is paid more and more attention, with its solar blind and Non-Line-of-Sight characteristic. However, it is hard to capture and recover the transmitted signal outdoor without synchronized signal. In this work, we integrate Universal Software Radio Peripheral (USRP) into UV communication system and employ GPS as synchronized signal. At receive side, photon counting and adaptive threshold method are used to recover original signal. Through experiments, we test path loss and BER of the system under di erent con guration geometries. Some results are compared to the previous proposed path loss and BER models.

Liao, Linchao; Chen, Gang; Sadler, Brian M.; Li, Zening

2013-09-01

398

Low level communication management for e-health systems  

NASA Astrophysics Data System (ADS)

The heterogeneity of e-health systems encourages the use of standards such as Health Level 7 (HL7v3) to ensure interoperability. Many actual implementations address this problem by unoptimized high level programming of top-range portable computing platforms. However, this approach could pose excessive demands on battery-powered mid-range terminals. In this work, we propose low-level support for portable HL7v3-compatible embedded systems in order to better exploit their limited processing and communications capabilities. In particular, we present our experience in mobile communication management through two different approaches, which proves the feasibility of this proposal.

Riva, Guillermo; Zerbini, Carlos; Voos, Javier; Centeno, Carlos; González, Eduardo

2011-12-01

399

Reverberation and frequency attenuation in forests-implications for acoustic communication in animals  

NASA Astrophysics Data System (ADS)

Rates of reverberative decay and frequency attenuation are measured within two Australian forests. In particular, their dependence on the distance between a source and receiver, and the relative heights of both, is examined. Distance is always the most influential of these factors. The structurally denser of the forests exhibits much slower reverberative decay, although the frequency dependence of reverberation is qualitatively similar in the two forests. There exists a central range of frequencies between 1 and 3 kHz within which reverberation varies relatively little with distance. Attenuation is much greater within the structurally denser forest, and in both forests it generally increases with increasing frequency and distance, although patterns of variation differ between the two forests. Increasing the source height generally reduces reverberation, while increasing the receiver height generally reduces attenuation. These findings have considerable implications for acoustic communication between inhabitants of these forests, particularly for the perching behaviors of birds. Furthermore, this work indicates the ease with which the general acoustic properties of forests can be measured and compared.

Padgham, Mark

2004-01-01

400

Characterizing Computation-Communication Overlap in Message-Passing Systems  

SciTech Connect

Effective overlap of computation and communication is a well understood technique for latency hiding and can yield significant performance gains for applications on high-end computers. In this report, we describe an instrumentation framework developed for message-passing systems to characterize the degree of overlap of communication with computation in the execution of parallel applications. The inability to obtain precise time-stamps for pertinent communication events is a significant problem, and is addressed by generation of minimum and maximum bounds on achieved overlap. The overlap measures can aid application developers and system designers in investigating scalability issues. The approach has been used to instrument two MPI implementations as well as the ARMCI system. The implementation resides entirely within the communication library and thus integrates well with existing approaches that operate outside the library. The utility of the framework is demonstrated by analyzing communication-computation overlap for micro-benchmarks and the NAS benchmarks, and the insights obtained are used to modify the NAS SP benchmark, resulting in improved overlap.

David E. Bernholdt; Jarek Nieplocha; P. Sadayappan; Aniruddha G. Shet; Vinod Tipparaju

2008-01-31

401

Characterizing Computation-Communication Overlap in Message-Passing Systems  

SciTech Connect

Effective overlap of computation and communication is a well understood technique for latency hiding and can yield significant performance gains for applications on high-end computers. In this report, we describe an instrumentation framework developed for messagepassing systems to characterize the degree of overlap of communication with computation in the execution of parallel applications. The inability to obtain precise time-stamps for pertinent communication events is a significant problem, and is addressed by generation of minimum and maximum bounds on achieved overlap. The overlap measures can aid application developers and system designers in investigating scalability issues. The approach has been used to instrument two MPI implementations as well as the ARMCI system. The implementation resides entirely within the communication library and thus integrates well with existing approaches that operate outside the library. The utility of the framework is demonstrated by analyzing communication-computation overlap for micro-benchmarks and the NAS benchmarks, and the insights obtained are used to modify the NAS SP benchmark, resulting in improved overlap.

David E. Bernholdt; Jarek Nieplocha; P. Sadayappan; Aniruddha G. Shet; Vinod Tipparaju

2008-01-31

402

An ethanol vapor chamber system for small animals.  

PubMed

Ethanol vapor chambers have been utilized widely in alcohol research since their introduction in 1971, and implementations of these systems are now available commercially. Here, we present a modification of the chamber that can be built at lower cost and greater simplicity of operation. The six-chamber system for rats has multiple air pumps. Ethanol vapor levels are adjusted with the air flow rate, ethanol drip rate, and dilution with room air, without a heater or fans. Ethanol vapor concentrations are measured with a breathalyzer, using room air to dilute the vapor chamber output into the range of the breathalyzer. Multiple pumps provide backup to ensure animal survival in the case of failure of the primary air pump. Tests in animals demonstrated comfortable and stable elevation of blood ethanol, with tight control of the ethanol vapor concentrations and the ability to select from a broad range of levels. The ethanol vapor measurement was rapid and efficient. The parts cost was a few thousand U.S. dollars. This vapor chamber system features low cost, ease of use, and convenient and inexpensive measurement of ethanol vapor concentrations. The lack of a heater and electrical components that could come into contact with ethanol in our case facilitated institutional approval. PMID:22575431

Wang, Jie; Jiang, Lihong; Du, Hongying; Mason, Graeme F

2012-05-07

403

An Ethanol Vapor Chamber System for Small Animals  

PubMed Central

Ethanol vapor chambers have been utilized widely in alcohol research since their introduction in 1971, and implementations of these systems are now available commercially. Here, we present a modification of the chamber that can be built at lower cost and greater simplicity of operation. The six-chamber system for rats has multiple air pumps. Ethanol vapor levels are adjusted with the air flow rate, ethanol drip rate, and dilution with room air, without a heater or fans. Ethanol vapor concentrations are measured with a breathalyzer, using room air to dilute the vapor chamber output into the range of the breathalyzer. Multiple pumps provide backup to ensure animal survival in the case of failure of the primary air pump. Tests in animals demonstrated comfortable and stable elevation of blood ethanol, with tight control of the ethanol vapor concentrations and the ability to select from a broad range of levels. The ethanol vapor measurement was rapid and efficient. The parts cost was a few thousand U.S. dollars. This vapor chamber system features low cost, ease of use, and convenient and inexpensive measurement of ethanol vapor concentrations. The lack of a heater and electrical components that could come into contact with ethanol in our case facilitated institutional approval.

Wang, Jie; Jiang, Lihong; Du, Hongying; Mason, Graeme F.

2012-01-01

404

Comparative Work Environment Perceptions of Operating Personnel within Experimental and Standard Communication Systems.  

National Technical Information Service (NTIS)

An experimental semi-automated field communication system was evaluated in comparison with the current standard communication system. Scanners in the experimental system and operators and transcribers on the standard system completed two questionnaires de...

S. L. Cohen

1975-01-01

405

Research on Optimization of Data Communication in Battle Damage Simulation System  

Microsoft Academic Search

Data communication is deeply studied to solve the real-time property and the stability of the data communication that is the key problem in the battle damage simulation system, following the logic process of data generating, sending, transmitting, receiving. Meanwhile, a series of optimized methods are proposed from the aspects of communication interface, communication server working model, concurrent communication method, and

Qingtang Su

2009-01-01

406

Central projections of sensory systems involved in honey bee dance language communication.  

PubMed

Honey bee dance language is a unique and complex form of animal communication used to inform nest mates in the colony about the specific location of food sources or new nest sites. Five different sensory systems have been implicated in acquiring and communicating the information necessary for dance language communication. We present results from neuronal tracer studies identifying the central projections from four of the five. Sensory neurons of the dorsal rim area of the compound eyes, involved in acquiring sun-compass based information, project to the dorsal-most part of the medulla. Sensory neurons of the neck hair plates, required to transpose sun-compass based information to gravity-based information in the dark hive, project to the dorsal labial neuromere of the subesophageal ganglion. Sensory neurons from the antennal joint hair sensilla and the Johnston's organ, which perceive information on dance direction and distance from mechanostimuli generated by abdomen waggling and wing vibration, project to the deutocerebral dorsal lobe and the subesophageal ganglion, and the posterior protocerebrum, respectively. We found no 'dance-specific' projections relative to those previously described for drone and queen honey bees and other insect species that do not exhibit dance communication. We suggest that the evolution of dance language communication was likely based on the modification of central neural pathways associated with path integration, the capability to calculate distance, and directional information during flight. PMID:17519525

Brockmann, Axel; Robinson, Gene E

2007-05-18

407

Mobile communications and the federal telecommunications system  

Microsoft Academic Search

The first major radio program of the Federal Telecommunications System has been the installation of an extended-coverage VHF Mobile Telephone System for evaluation of the common-user concept of reducing the number of frequencies required by several users by time-sharing. Subscribers are provided three-channel full-duplex dial-up service, with such features as direct dialing of any other mobile, as well as any

R. B. Conrad

1959-01-01

408

Sustainability Communication: A Systemic-Constructivist Perspective  

Microsoft Academic Search

\\u000a Systems theory and constructivism as background theories are widely discussed. This chapter gives an overview of the core\\u000a theses, key terms and observer perspectives of this paradigm, with reference to the special features of systemic thinking.\\u000a The interconnectedness of cognition and emotion as well as the construction of reality through language are important for\\u000a the sustainability discussion.

Horst Siebert

409

CATV Transmission in Optical Communication System  

NASA Astrophysics Data System (ADS)

In this paper we analyze analog CATV transmission system where only one wavelength is used for transmission on which multiple analog RF channels modulated. We analyze different modulation distortions such as composite second order (CSO), composite triple beat (CTB) and intermodulation distortions at different frequencies. Good performance of CSO > -36 dBc and CTB > -41 dBc are obtained at 62.5 MHz, 125 MHz and 187.5 MHz in three tone directly modulated CATV transmission system.

Kaur, Amandeep; Kaur, Amanpreet; Bhatia, Kamaljit Singh; Singh, Kulwinder

2013-09-01

410

Variable structure multiple model tracking for airborne laser communication systems  

NASA Astrophysics Data System (ADS)

Free space laser communication based on airborne platforms will play a important role on the future space communications, high precision tracking system for airborne laser communication has been already the one of the best difficult problem. Because of diversity of maneuvering forms and high nonlinear problem, it is usual to adopt multiple models algorithm with a fixed structure for tracking system, which brings unnecessary inter-competition among the amount of models and calculation burden, in order to resolve this contradiction, a variable structure multiple-model (VSMM)based on digraph switching is presented, the particle filter (PF) can deal with nonlinear/non-Guassian problems, it can be introduced into VSMM framework. Simulation results show that the algorithm improves the accuracy of tracking by reducing the competition of the models as well as reducing the computation burden.

Cao, Yang; Guo, Jing; Huang, Liwen

2013-08-01

411

Humans mimicking animals: a cortical hierarchy for human vocal communication sounds.  

PubMed

Numerous species possess cortical regions that are most sensitive to vocalizations produced by their own kind (conspecifics). In humans, the superior temporal sulci (STSs) putatively represent homologous voice-sensitive areas of cortex. However, superior temporal sulcus (STS) regions have recently been reported to represent auditory experience or "expertise" in general rather than showing exclusive sensitivity to human vocalizations per se. Using functional magnetic resonance imaging and a unique non-stereotypical category of complex human non-verbal vocalizations-human-mimicked versions of animal vocalizations-we found a cortical hierarchy in humans optimized for processing meaningful conspecific utterances. This left-lateralized hierarchy originated near primary auditory cortices and progressed into traditional speech-sensitive areas. Our results suggest that the cortical regions supporting vocalization perception are initially organized by sensitivity to the human vocal tract in stages before the STS. Additionally, these findings have implications for the developmental time course of conspecific vocalization processing in humans as well as its evolutionary origins. PMID:22674283

Talkington, William J; Rapuano, Kristina M; Hitt, Laura A; Frum, Chris A; Lewis, James W

2012-06-01

412

Communication  

Microsoft Academic Search

\\u000a Communication impairment is a core deficit associated with autism spectrum disorder (ASD). Therefore, it should not be surprising\\u000a that this topic has become a major thrust of assessment and treatment in applied behavior analysis (ABA). The types of communication\\u000a skills to target for intervention and the behavioral assessment methods that can be used to identify these target behaviors\\u000a are reviewed

Jeff Sigafoos; Mark F. O’Reilly; Giulio E. Lancioni

413

A Proof Environment for the Development of Group Communication Systems  

Microsoft Academic Search

We present a theorem proving environment for the devel- opment of reliable and ecient group communication systems. Our ap- proach makes methods of automated deduction applicable to the imple- mentation of real-world systems by linking the Ensemble group com- munication toolkit to the NuPRL proof development system. We present tools for importing Ensemble's code into NuPRL and ex- porting it

Christoph Kreitz; Mark Hayden; Jason Hickey

1998-01-01

414

Research paper: The effects of hands-free communication device systems: communication changes in hospital organizations  

Microsoft Academic Search

ObjectiveTo analyze the effects that hands-free communication device (HCD) systems have on healthcare organizations from multiple user perspectives.DesignThis exploratory qualitative study recruited 26 subjects from multiple departments in two research sites located in Portland, Oregon: an academic medical center and a community hospital. Interview and observation data were gathered January through March, 2007.MeasurementsData were analyzed using a grounded theory approach.

Joshua E. Richardson; Joan S. Ash

2010-01-01

415

THROUGH-THE-EARTH (TTE) COMMUNICATIONS SYSTEM AND THE IN-MINE POWER LINE (IMPL) COMMUNICATIONS SYSTEM  

SciTech Connect

Work has progressed on both subsystems: the Through-the-Earth (TTE) Communications system and the In-Mine Power Line (IMPL) Communications system. The TTE system: The system was fabricated and repackaged as an industrial product enclosed in a commercial rugged, waterproof housing suitable for installation in mines. Features were added to the system to appeal to the preferences of different mine managers. Arrangements were made with NIOSH to install the system in the Lake Lynn underground mine for evaluation and demonstration to potential users. The IMPL system: Voice compression was successfully implemented and incorporated into the laboratory model. Compressed voice was transmitted through a power line, expanded at the receiving end, and received with high clarity.

Zvi H. Meiksin

2002-01-01

416

Raman amplification for fiber communications systems  

Microsoft Academic Search

Raman amplification has enabled dramatic increases in the reach and capacity of lightwave systems. This tutorial explains why, starting with the fundamental properties of gain from stimulated Raman scattering. Next, noise accumulation from amplified spontaneous emission is reviewed, and the merits of distributing Raman gain along a transmission fiber are explained. Other sources of noise that are particularly relevant for

Jake Bromage

2004-01-01

417

Communication systems in transport — Hybrid ITS interface  

Microsoft Academic Search

The goal of this paper is to analyse, define, and summarise the requirements on networks connecting telematic technologies based on Intelligent Transport Systems (ITS). The paper describes the methodics of setting and a general concept of technological networks interface based on available and applicable standards Focus is set on data transmission in form of a video-stream and its tunnelling through

Peter Holecko; Emilia Bubenikova; Rastislav Pirnik

2012-01-01

418

Radiation-hardened microwave communications system  

SciTech Connect

The consolidated fuel reprocessing program (CFRP) at the Oak Ridge National Laboratory (ORNL) has been developing signal transmission techniques and equipment to improve the efficiency of remote handling operations for nuclear applications. These efforts have been largely directed toward the goals of (a) remotely controlling bilateral force-reflecting servomanipulators for dexterous manipulation-based operations in remote maintenance tasks and (b) providing television viewing of the work site. In September 1987, developmental microwave transceiving hardware operating with dish antennas was demonstrated in the advanced integrated maintenance system (AIMS) facility at ORNL, successfully implementing both high-quality one-way television transmissions and simultaneous bidirectional digital control data transmissions with very low error rates. Initial test results based on digital transmission at a 1.0-Mbaud data rate indicated that the error rates of the microwave system were comparable to those of a hardwired system. During these test intervals, complex manipulator operations were performed, and the AIMS transporter was moved repeatedly without adverse effects on data integrity. Results of these tests have been factored into subsequent phases of the development program, with an ultimate goal of designing a fully radiation-hardened microwave signal transmission system for use in nuclear facilities.

Smith, S.F.; Crutcher, R.I.; Vandermolen, R.I. (Oak Ridge National Lab., TN (United States))

1990-01-01

419

A high-sensitivity small animal SPECT system  

NASA Astrophysics Data System (ADS)

Medical imaging using single gamma-ray-emitting radionuclides typically makes use of parallel hole collimators or pinholes in order to achieve good spatial resolution. However, a tradeoff in sensitivity is inherent in the use of a collimator, and modern preclinical single photon emission computed tomography (SPECT) systems detect a very small fraction of emitted gamma rays, often less than 0.1%. A system for small animal SPECT imaging which uses no collimators could potentially achieve very high sensitivity—several tens of percent—with reasonably sized detectors. This would allow two significant improvements in preclinical studies: images could be obtained more rapidly, allowing higher throughput for screening applications, or for dynamic processes to be observed with very good time resolution; and images could be obtained with less radioactive tracer, making possible the in vivo imaging of low-capacity receptor systems, aiding research into new tracer compounds, and reducing the cost and easing the regulatory burden of an experiment. Of course, a system with no collimator will not be able to approach the submillimeter spatial resolutions produced by the most advanced pinhole and collimated systems, but a high-sensitivity system with resolution of order 1 cm could nonetheless find significant and new use in the many molecular imaging applications which do not require good spatial resolution—for example, screening applications for drug development or new imaging agents. Rather than as an alternative to high-resolution SPECT systems, the high-sensitivity system is proposed as a radiotracer alternative to optical imaging for small animals. We have developed a prototype system for mouse imaging applications. The scanner consists of two large, thin, closely spaced scintillation detectors. Simulation studies indicate that a FWHM spatial resolution of 7 mm is possible. In an in vivo mouse imaging study using the 99mTc labeled tracer MAG-3, the sensitivity of the system is measured to be 40%. Simple projection images created by analytically combining the two detectors' data show sufficient resolution to observe the dynamic distribution of the radiotracer in the mouse.

Mitchell, Gregory S.; Cherry, Simon R.

2009-03-01

420

Autonomous control system for offshore oil exploitation using digital acoustic communication  

Microsoft Academic Search

Underwater acoustic communication systems are the best choice to implement a cableless communication system suitable for the expected setups at subsea oil production systems. The main points at these systems are the communication reliability and the hardware reliability. Usually the control or monitoring systems could operate at a very low data rate. Typically, these acoustic systems need to operate at

Cassio Kuchpil; A. L. F. Xavier; J. A. P. da Silva; M. R. B. P. L. Jimenez

1997-01-01

421

Photonic design automation of optical communication systems  

NASA Astrophysics Data System (ADS)

Photonic Design Automation (PDA) describes the design methodologies, software tools and services used to engineer complex photonic networks and products. It offers software integration along the signal path from transmitter to receiver, across the value chain from component and systems manufacturer to network operator, and allows to reduce number of costly and time consuming lab experiments and field trials investigating new system architectures and characterizing optical components. This presentation discusses various modeling aspects along the optical propagation channel. The concept of multiple optical signal representations is briefly introduced, which allows distinguishing between data signals, optical noise, distortions and crosstalk throughout the fiber transmission. The trends of modeling optical transmitters, fibers, doped fiber amplifiers, and of estimating the bit-error rate are outlined. The optimization of multiple pump lasers to achieve high-gain bandwidth fiber Raman amplifiers is discussed. The link of simulation models with real-world component measurement is discussed on an exemplary basis.

Richter, Andre; Koltchanov, Igor; Lowery, Arthur

2005-02-01

422

A digital satellite communications system for SPRINT  

NASA Astrophysics Data System (ADS)

Switched voice, digital data and private line traffic are scheduled to be implemented in 1984-1988 by a digital satellite system encompassing the Spacenet and Gstar satellites. This system features TDMA terminals operating at 60, 90, and 120 Mbps with 36, 54 or 72 MHz-bandwidth transponders, respectively. The network topology will identify two application types: that designated 'on-net', whose earth stations will be strategically located at major junctions of the existing microwave backbone, near the larger cities, and will carry long haul, heavy route traffic between those junctions; and that designated 'off-net', whose earth stations are located off the microwave backbone at smaller cities and will access the backbone, and thence the entire SPRINT network, via gateway earth stations located at major junction sites.

Pourmand, B.; Jacobs, A.

423

A Prototype HTML Training System for Graphic Communication Majors  

ERIC Educational Resources Information Center

|This design research demonstrates a prototype content management system capable of training graphic communication students in the creation of basic HTML web pages. The prototype serve as a method of helping students learn basic HTML structure and commands earlier in their academic careers. Exposure to the concepts of web page creation early in…

Runquist, Roger L.

2010-01-01

424

Communication systems for grid integration of renewable energy resources  

Microsoft Academic Search

There is growing interest in renewable energy around the world. Since most renewable sources are intermittent in nature, it is a challenging task to integrate renewable energy resources into the power grid infrastructure. In this grid integration, communication systems are crucial technologies, which enable the accommodation of distributed renewable energy generation and play an extremely important role in monitoring, operating,

F. Richard Yu; Peng Zhang; Weidong Xiao; Paul Choudhury

2011-01-01

425

The Global System for Mobile Communications Short Message Service  

Microsoft Academic Search

This tutorial presents an overview of the Global System for Mobile Communications Short Message Service from the viewpoint of implementing new telematic services. The SMS offers the users of GSM networks the ability to exchange alphanumeric messages up to the limit of 160 characters. The tutorial is motivated by an acute absence of research publications in this field. The information

C. Peersman; S. Cvetkovic; P. Griffiths; H. Spear

2000-01-01

426

Prediction analysis of the electromagnetic interfering signal in communication systems  

Microsoft Academic Search

This paper is devoted to investigation on prediction analyzing of the electromagnetic interfering signal in communication systems. In this paper, we proposed the concept of mathematical model group, and discussed the problem from several aspects which is listed below: frequency band of the transmitter, clutter and harmonic model of the receiver, the radiation power of the receiver, the modulation envelope

Liu Ping; Xie Yongping; Ma Youjun; Zhang Ruihua

2003-01-01

427

National Institute for Literacy. Literacy Information and Communication System ("LINCS")  

ERIC Educational Resources Information Center

Each month, the Literacy Information and Communication System ("LINCS") will feature one of the three LINCS Resource Collections--Basic Skills, Program Management, and Workforce Competitiveness--and introduce research-based resources that practitioners can use in their adult and family literacy programs and classrooms. This edition features the…

National Institute for Literacy, 2010

2010-01-01

428

Training Paraprofessionals to Implement the Picture Exchange Communication System (PECS)  

ERIC Educational Resources Information Center

|Based on Skinner's "Verbal Behavior" (1957), the picture exchange communication system (PECS) was designed to teach children with autism functional verbal behavior. Much research has demonstrated the effectiveness and efficiency of PECS in building verbal behavior. However, because PECS training is typically presented in a group format and later…

Sloman, Glenn Matthew

2010-01-01

429

Development of a globally harmonized system for hazard communication  

Microsoft Academic Search

As a result of an international mandate adopted in 1992 at the United Nations Conference on the Environment and Development (UNCED), a globally harmonized system (GHS) for hazard communication has been developed. The work has involved significant contributions from numerous countries and international organizations. The GHS is designed to be a common and coherent approach to defining and classifying hazards

Jennifer C. Silk

2003-01-01

430

Open information system and crisis communication in China  

Microsoft Academic Search

This paper discusses the role of media and communication at times of public crisis and contends that a modern, open information system is a precondition for good crisis management. It traces evolving policy discourse in Mainland China with a special focus on the relationship between the authorities and media. An overview is provided to contextualize and historicize the contemporary development.

Lidan Chen

2008-01-01

431

Design of Experiments to Quantify Communication Satellite System Performance.  

National Technical Information Service (NTIS)

The report describes the steps for designing experiments to quantify the performance of a communication satellite system according to the methods specified by ANS X3.141. Performance is described in terms of performance parameters that are user-oriented a...

R. D. Cass M. J. Miles

1990-01-01

432

Communication Systems Simulator with Error Correcting Codes Using MATLAB  

ERIC Educational Resources Information Center

|In this work, the characteristics of a simulator for channel coding techniques used in communication systems, are described. This software has been designed for engineering students in order to facilitate the understanding of how the error correcting codes work. To help students understand easily the concepts related to these kinds of codes, a…

Gomez, C.; Gonzalez, J. E.; Pardo, J. M.

2003-01-01

433

Error Probability of Asynchronous Spread Spectrum Multiple Access Communication Systems  

Microsoft Academic Search

Several approaches for the evaluation of upper and lower bounds on error probability of asynchronous spread spectrum multiple access communication systems are presented. These bounds are obtained by utilizing an isomorphism theorem in the theory of moment spaces. From this theorem, we generate closed, compact, and convex bodies, where one of the coordinates represents error probability, while the other coordinate

Kung Yao

1977-01-01

434

A data communications and processing system for cardiac analysis  

Microsoft Academic Search

Many aspects of medical diagnoses involve extensive, tedious procedures in which the capabilities of a digital computer can provide the physician an invaluable aid. Because of the complexity and cost of modern computers, systems to aid in diagnostic procedures must generally be centrally located and be capable of serving many physicians. Thus, data communication links between the physicians and the

M. D. Balkovic; C. A. Steinberg; P. C. Pfunke; C. A. Caceres

1962-01-01

435

Performance of dimming control scheme in visible light communication system.  

PubMed

We investigate the performance of visible light communication (VLC) system with a pulse width modulation (PWM) dimming control scheme. Under this scheme, the communication quality in terms of number of transmitted bits and bit error rate (BER) of less than 10(-3) should be guaranteed. However, for on-off-keying (OOK) signal, the required data rate becomes 10 times as high as the original data rate when the duty cycle of dimming control signal is 0.1. To make the dimming control scheme easy to be implemented in VLC system, we propose the variable M-QAM OFDM VLC system, where M is adjusted according to the brightness of LED light in terms of duty cycle. The results show that with different duty cycles the required data rates are not higher than the original value and less LED lamp power is required to guarantee the communication quality, which makes the dimming control system that satisfies both communication and illumination requirements easy to be implemented and power-saving. PMID:23038525

Wang, Zixiong; Zhong, Wen-De; Yu, Changyuan; Chen, Jian; Francois, Chin Po Shin; Chen, Wei

2012-08-13

436

Designing MIMO communication systems: constellation choice and linear transceiver design  

Microsoft Academic Search

This papers considers the design of a mutiple-input multiple-output (MIMO) communication system with channel knowledge at the transmitter and receiver. The design methods available in the literature have addressed the following two aspects of the problem: a) choice of the symbol constellations for a given transmission scheme or b) choice of the optimal (linear) precoder and equalizer for a given

Daniel Perez Palomar; Sergio Barbarossa

2005-01-01

437

Performance of CDMA\\/OFDM for mobile communication system  

Microsoft Academic Search

The OFDM technique is an interesting approach in mobile communications in order to achieve a high spectral efficiency and to combat the frequency selectivity of the channel. Another interesting technique is a CDMA system with Rake-receiver. The main advantages of CDMA are well known, but its capacity is limited by multiuser interference. The aim of this study is to combine

K. Fazel

1993-01-01

438

Comparison of upgrade techniques for mobile communication systems  

Microsoft Academic Search

For current mobile communication systems, two limitations exist which restrict their capacity and range of application. They can be characterised as an equipment limit which is determined by the maximum number of mobile stations that can be supported by a base station with given equipment, and an interference limit, which corresponds to a maximum number of carriers that can be

Michael Tangemann; Rupert Rheinschmitt

1994-01-01

439

Group Communication in Partitionable Systems: Specification and Algorithms  

Microsoft Academic Search

Abstract: We give a formal specification and an implementation for a partitionable group communication servicein asynchronous distributed systems. Our specification is motivated by the requirements for building"partition-aware" applications that can continue operating without blocking in multiple concurrent partitionsand reconfigure themselves dynamically when partitions merge. The specified service guaranteesliveness and excludes trivial solutions; it constitutes a useful basis for building...

Özalp Babaoglu; Renzo Davoli; Alberto Montresor

2001-01-01

440

Terrestrial Communications Systems in Distance Education. A Reference Booklet.  

ERIC Educational Resources Information Center

|This booklet is intended as a reference on the application of the technology of communication systems to distance education. An introductory section addresses the nature of the interaction imposed by use of various technologies. The next section overviews current telecommunications applications based on these major technologies: radio, television…

Worthington, Ross

441

Field demonstrations of communication systems for distribution automation. Final report  

SciTech Connect

This report summarizes the results of a field demonstration of the use of UHF radio links in the 950-MHz portion of the spectrum as a communication medium for performing automated electric power distribution. Prototype radiohardware was combined with logic and control equipment developed by Westinghouse for power-line carrier automated distribution systems. Transceivers were used in the remote interactive terminals. 3dbm transceivers were used in the Central Base Station and the three Primary Radio Terminals, which functioned as system repeaters. Pre-installation field-strength measurements were made along selected radials and in spot locations to characterize the anticipated field-strength contours that would be encountered during the operational testing. A propagation model was developed that accurately predicted the conditions actually recorded. Post-installation measurements were used to further calibrate the computer model. The resulting propagation analysis proved exceedingly effective in characterizing a UHF radio system for digital communication. Data collected during a 10-month operational period supports the conclusion that 950-MHz radio is a viable communications medium for performing utility automated distribution functions. The system consists of 250 remote terminals, each interrogated from three sites. This provides 750 paths for communication performance evaluation.The reliability of the prototype radio units used in this project fell below that predicted through MTBF analysis, and did not meet utility reliability standards. The logic and control circuitry and central station required very little maintenance during the test.

Not Available

1981-06-01

442

Evaluating the Effectiveness of Anonymity Communication Systems Against Malicious Insiders  

Microsoft Academic Search

The traffic analysis problem is one in which the communication partners of Internet users are learned by unrelated parties. Few works have been devoted to evaluating the effectiveness of the proposed anonymity designs. This paper proposes a unique adversary model to quantitatively measure how much precise information an attacker can obtain while subverting anonymity systems. The results of simulation experiments

Gen-Yih Liao

2007-01-01

443

Modeling Communication Networks with Hybrid Systems: Extended Version  

Microsoft Academic Search

This paper introduces a general hybrid systems framework to model the flow of traffic in communication networks. The proposed models use averaging to continuously approximate discrete variables such as congestion window and queue size. Because averaging occurs over short time intervals, discrete events such as the occurrence of a drop and the consequent reaction by congestion control can still be

Junsoo Lee; Stephan Bohacek; P. Hespanha; Katia Obraczka

444

Group communication in the Amoeba distributed operating system  

Microsoft Academic Search

Primitives for broadcast communication that have been integrated with the Amoeba distributed operating system are introduced. The semantics of the broadcast primitives are simple and easy to understand, but are still powerful. The proposed primitives, for example, guarantee global ordering of broadcast messages. The proposed primitives are also efficient: a reliable broadcast can be done in just slightly more than

M. Frans Kaashoek; Andrew S. Tanenbaum

1991-01-01

445

Range predictions for a CO2 laser communication system  

NASA Astrophysics Data System (ADS)

Calculations are presented to permit range predictions of a CO2 laser communication system when attenuation statistics are available. Both TV and digital transmission are considered. In the former case, an AM-FM modulation scheme is used. Direct demodulation is assumed. Examples are given in the use of the results to obtain range probabilities based on reported propagation statistics.

Waksberg, A.

1981-08-01

446

Communication-system blackout during reentry of large vehicles  

Microsoft Academic Search

Much of the theoretical research on reentry blackout is in a format difficult for the communications design engineer to use in his system analysis. This paper derives simplified equations for the average sheath power loss that may be added (in dB) to the usual space loss to obtain an approximate total propagation loss. The plasma and sheath properties are discussed

1967-01-01

447

Optical antenna design for indoor optical wireless communication systems  

Microsoft Academic Search

In the present paper, the design of the non-imaging totally internally reflecting concentrator family denominated optical antennas (OAs) is discussed, and its use for indoor optical wireless communication systems is explained. The lenses presented here can be designed to provide a prescribed angular response in order to limit the central wavelength shift in thin-film optical filters. They can also be

Roberto Ramirez-Iniguez; R. J. Green

2005-01-01

448

The Role of the Limbic System in Human Communication.  

ERIC Educational Resources Information Center

|Linguistics has chosen as its niche the language component of human communication and, naturally enough, the neurolinguist has concentrated on lateralized language systems of the cerebral hemispheres. However, decoding a speaker's total message requires attention to gestures, facial expressions, and prosodic features, as well as other somatic and…

Lamendella, John T.

449

Empirical Macromodeling of Operating System Communication Primitives  

Microsoft Academic Search

The capability of estimating the energy consumption of soft- ware in multi-processor systems-on-chip (MPSoCs) is cru- cial for enabling quick evaluation of both software and hard- ware optimizations. However, true high-level power estima- tion should be applicable at the software level, possibly through ee ctive power models depending on parameters which can be derived directly from the characteristics of the

Mirko Loghi; Massimo Poncino; Luca Benini

450

Multimodal communication in animals, humans and robots: An introduction to perspectives in brain-inspired informatics  

Microsoft Academic Search

Recent years have seen convergence in research on brain mechanisms and neurocomputational approaches, culminating in the creation of a new generation of robots whose artificial “brains” respect neuroscience principles and whose “cognitive” systems venture into higher cognitive domains such as planning and action sequencing, complex object and concept processing, and language. The present article gives an overview of selected projects

Stefan Wermter; M. Page; M. Knowles; Vittorio Gallese; Friedemann Pulvermüller; J. Taylor

2009-01-01

451

A unique multi-access laser communications transceiver system  

NASA Astrophysics Data System (ADS)

A 'many points in one point' multiaccess laser system has been examined, and results are reported which indicating the feasibility of optical communications multiaccess communications is feasible and that the resultant terminal size and with savings are very substantial compared to the dedicated optical terminals or RF multiaccess approaches. A preliminary design has been accomplished of a package that can weigh less than 150 pounds and which uses a 10-in. effective diameter fixed telescope and requires less than 100 W of regulated power and less than 8 cu ft of space.

Ross, Monte

1990-07-01

452

Evaluation Indicator System and Weights Research of Communication Effects in ERP Implementation Project  

Microsoft Academic Search

Based on communication theory and characteristics of communication in ERP implementation project, this paper focuses on communication influencing factors analysis and proposes a new two level evaluation indicator system of communication effects for ERP implementation project. Besides, this paper carries on a weights research of the indicator system by means of the analytic hierarchy process (AHP) method, questionnaire survey and

Zhang Yuying; Xu Yanan

2009-01-01

453

Waveguide communication system for centralized railway traffic control  

Microsoft Academic Search

A new microwave communication system for centralized train traffic control, utilizing TE01mode propagating circular waveguide as a transmission line is discussed. The system was developed for control of 100 ultra-high-speed trains on a railroad 500 km in length. The aluminum waveguide of 132-mm ID, with measured attenuation of 2.0 db\\/km on 7500- Mc band, with a helical waveguide as a

T. Kawakami; T. Maruhama; T. Takeya; S. Kohno

1959-01-01

454

Lattice-reduction-aided detectors for MIMO communication systems  

Microsoft Academic Search

Lattice-reduction (LR) techniques are developed for enhancing the performance of multiple-input multiple-output (MIMO) digital communication systems. When used in conjunction with traditional linear and nonlinear detectors, LR techniques substantially close the gap to fundamental performance limits with little additional system complexity. Results for individual channels and ensembles are developed, and illustrated in detail for the case of small (2 ×

Huan Yao; Gregory W. Wornell

2002-01-01

455

Noise Resistant OFDM for Power-Line Communication Systems  

Microsoft Academic Search

In this paper, we present a new approach to noise suppression for power-line communications based on orthogonal frequency-division multiplexing (OFDM). Previous work for wireless systems has suggested that augmentation of OFDM using spreading codes prior to modulation offers some narrowband interference (NBI) resistant capabilities. We present a study of the performance of such a system for power-line networks-well known to

Jun Zhang; Julian Meng

2010-01-01

456

Fuzzy-based health information monitoring and communication system  

Microsoft Academic Search

In this paper, a fuzzy-based information monitoring and communication system especially developed for helping care givers to provide better care to the cared person in a healthcare center is introduced. The fuzzy-based expert system is also developed to conduct the analysis of care-receivers' vital signs which are collected from the vital sign sensors carried by the cared person who maybe

Ruey-Kei Chiu; Chia-Lung Ho; Yen-Chun Chang; Hsiu-Mei Tu

2010-01-01

457

Evolving perspectives of 4th generation mobile communication systems  

Microsoft Academic Search

The last decade of the 20th century has been witness to remarkable technological developments in the area of wireless communication technologies. Following the commercial deployment-and subsequent worldwide success-of 2nd generation mobile telecommunication systems, such as GSM, standardization bodies, industry partners and regulatory fora from around the globe joined forces in producing the standards for 3rd generation mobile telecommunication systems. In

Vangelis Gazis; Nikos Houssos; Anastasia Alnnistiotil; Lazaros Merakos

2002-01-01

458

Millimeter-wave fiber optics systems for personal radio communication  

Microsoft Academic Search

System concepts for millimeter-wave personal communication systems and the advantages of millimeter-wave band usage are briefly described. Demonstration of broadband millimeter-wave subcarrier transmission concepts over fiber-optic links is performed. Several fiber-optic link architectures, including one using a combination of direct laser modulation and indirect (external) optical modulation, are outlined with respect to signal transmission at millimeter-wave frequencies. Several configurations are

Hiroyo Ogawa; David Polifko; Seiichi Banba

1992-01-01

459

The transmission link of CAPS navigation and communication system  

Microsoft Academic Search

The Chinese Area Positioning System (CAPS) is based on communication satellites with integrated capability, which is different\\u000a from the Global Positioning System (GPS), the International Maritime Satellite Organization (Inmarsat) and so on. CAPS works\\u000a at C-band, and its navigation information is not directly generated from the satellite, but from the master control station\\u000a on the ground and transmitted to users

Junxia Cui; Huli Shi; Jibin Chen; Jun Pei

2009-01-01

460

The Autonomic Nervous System as a Communication Channel between the Brain and the Immune System  

Microsoft Academic Search

Much evidence from various fields has revealed multiple channels of communication between the brain and the immune system. Among the routes of signal transmission, this review focuses on the roles and mechanisms of neural communication between the two systems. As for the centrifugal neural pathway by which the brain modulates immunity, there are various requirements for the noradrenergic sympathetic innervation

Tetsuro Hori; Toshihiko Katafuchi; Sachiko Take; Nobuaki Shimizu; Akira Niijima

1995-01-01

461

Investigation of a Photovoltaic/Battery Hybrid System for Powering the High Arctic Data Communications System.  

National Technical Information Service (NTIS)

The High Arctic Data Communications System (HADCS) was established to provide reliable communication between CFS Alert and Ottawa. This system includes a ground link from Alert to Eureka and a satellite link from Eureka to Ottawa. The ground link is neces...

C. L. Gardner

1989-01-01

462

Method and apparatus for animal positioning in imaging systems  

SciTech Connect

An apparatus for imaging an animal includes a first mounting surface, a bed sized to support the animal and releasably secured to or integral with the first mounting surface. The apparatus also includes a plurality of straps, each having a first end in a fixed position relative to the bed and a second end for tightening around a limb of the animal. A method for in-vivo imaging of an animal includes providing an animal that has limbs, providing a first mounting surface, and providing a bed removably secured to or integral with the mounting surface and sized to support the animal as well as being coupled to a plurality of straps. The method also includes placing the animal on the bed between the plurality of straps and tightening at least two of the plurality of straps around at least two of the limbs such that the animal is substantially secured in place relative to the bed.

Hadjioannou, Arion-Xenofon; Stout, David B.; Silverman, Robert W.

2013-01-01

463

Statistical Rick Estimation for Communication System Design --- A Preliminary Look  

NASA Astrophysics Data System (ADS)

Spacecraft are complex systems that involve different subsystems with multiple relationships among them. For these reasons, the design of a spacecraft is a time-evolving process that starts from requirements and evolves over time across different design phases. During this process, a lot of changes can happen. They can affect mass and power at the component level, at the subsystem level, and even at the system level. Each spacecraft has to respect the overall constraints in terms of mass and power: for this reason, it is important to be sure that the design does not exceed these limitations. Current practice in system models primarily deals with this problem, allocating margins on individual components and on individual subsystems. However, a statistical characterization of the fluctuations in mass and power of the overall system (i.e., the spacecraft) is missing. This lack of adequate statistical characterization would result in a risky spacecraft design that might not fit the mission constraints and requirements, or in a conservative design that might not fully utilize the available resources. Due to the complexity of the problem and to the different expertise and knowledge required to develop a complete risk model for a spacecraft design, this article is focused on risk estimation for a specific spacecraft subsystem: the communication subsystem. The current research aims to be a proof of concept of a risk-based design optimization approach, which can then be further expanded to the design of other subsystems as well as to the whole spacecraft. The objective of this research is to develop a mathematical approach to quantify the likelihood that the major design drivers of mass and power of a space communication system would meet the spacecraft and mission requirements and constraints through the mission design lifecycle. Using this approach, the communication system designers will be able to evaluate and to compare different communication architectures in a risk trade-off perspective. The results described in this article include a baseline communication system design tool and a statistical characterization of the design risks through a combination of historical mission data and expert opinion contributions. An application example of the communication system of a university spacecraft is presented. IPNPR Volume 42-189 Tagged File.txt

Babuscia, A.; Cheung, K.-M.

2012-02-01

464

Awareness-based communication management in the MASSIVE systems  

NASA Astrophysics Data System (ADS)

The MASSIVE-1 and MASSIVE-2 distributed virtual environment systems are based on an explicit model of user communication requirements known as the spatial model of interaction; this model addresses the general issue of managing communication in large space-based systems such as DVEs. The goals of the spatial model are to guide the distribution and presentation of information in a way which facilitates collaboration between participants (based on observed patterns of interaction in real-world environments) and which is also efficient and appropriate. The MASSIVE-1 system emphasized the spatial model's `aura' concept as the basis for a distinct shared service in an otherwise wholly unicast peer-to-peer system. This approach was effective for relatively small systems but could not be extended to make general use of multicast communication (to reduce total bandwidth requirements). The MASSIVE-2 system added the concept of `third-party objects' which support the definition and management of multiple multicast groups for updates and continuous media distribution.

Greenhalgh, Chris

1998-09-01

465

Curved array photoacoustic tomographic system for small animal imaging  

PubMed Central

We present systematic characterization of a photoacoustic imaging system optimized for rapid, high-resolution tomographic imaging of small animals. The system is based on a 128-element ultrasonic transducer array with a 5-MHz center frequency and 80% bandwidth shaped to a quarter circle of 25 mm radius. A 16-channel data-acquisition module and dedicated channel detection electronics enable capture of a 90-deg field-of-view image in less than 1 s and a complete 360-deg scan using sample rotation within 15 s. Measurements on cylindrical phantom targets demonstrate a resolution of better than 200 ?m and high-sensitivity detection of 580-?m blood tubing to depths greater than 3 cm in a turbid medium with reduced scattering coefficient ?s?=7.8cm?1. The system is used to systematically investigate the effects of target size, orientation, and geometry on tomographic imaging. As a demonstration of these effects and the system imaging capabilities, we present tomographic photoacoustic images of the brain vasculature of an ex vivo mouse with varying measurement aperture. For the first time, according to our knowledge, resolution of sub-200-?m vessels with an overlying turbid medium of greater than 2 cm depth is demonstrated using only intrinsic biological contrast.

Gamelin, John; Aguirre, Andres; Maurudis, Anastasios; Huang, Fei; Castillo, Diego; Wang, Lihong V.; Zhu, Quing

2008-01-01

466

Physical Geography: Science and Systems of the Human Environment; Animations  

NSDL National Science Digital Library

This website contains Flash animations and real footage movies (QuickTime format) from a physical geography textbook. Animations show phenomena associated with the atmosphere, biosphere, lithosphere, and hydrosphere/cryosphere. Animations are slow to download and cannot be rewound to stress important points. Users may also follow links to PowerPoint slides, interactive activities, an image library and an instructor's manual.

Strahler, Alan H.; University, Boston; Education, Wiley H.

467

Making recombinant proteins in animals – different systems, different applications  

Microsoft Academic Search

Transgenic animal bioreactors represent a powerful tool to address the growing need for therapeutic recombinant proteins. The ability of transgenic animals to produce complex, biologically active recombinant proteins in an efficient and economic manner has stimulated a great deal of interest in this area. As a result, genetically modified animals of several species, expressing foreign proteins in various tissues, are

Michael K. Dyck; Dan Lacroix; François Pothier; Marc-André Sirard

2003-01-01

468

Pitfalls of animal model systems in ageing research  

Microsoft Academic Search

Often, reports of anti-ageing research using animal models are overly optimistic and incomplete. Without having the details of the study (issues inherent with the animal models, the condition of the animal colony, the replicability of the findings, for example), even the educated public can find it difficult to interpret the reports accurately. This chapter provides background information about ageing research

Kevin Flurkey; Joanne M Currer

2004-01-01

469

Alhambra: A System for Producing 2D Animation  

Microsoft Academic Search

There is a great interest in producing computer animation that looks like 2D classic animation. The flat shading, silhouettes and inside contour lines are all visual characteristics that, joined to flexible expressiveness, constitute the basic elements of 2D animation. We have developed methods for obtaining the silhouettes and interior curves from polygonal models. Virtual lights is a new method for

Domingo Martín; Juan Carlos Torres

1999-01-01

470

Systems biotechnology of animal cells: the road to prediction.  

PubMed

A central concern of biopharmaceutical R&D is the production of sufficient quantities of recombinant products from manufacturing processes based on animal cell culture. The way in which bioprocess researchers have addressed this question experienced a tremendous shift over the years, progressing from almost empirical to more rational approaches. A step further is the application of systems biotechnology: recent technological advances for large-scale cell state characterization and creative methods for host cell modeling are becoming crucial for next-generation bioprocess optimization. Here we provide an overview of the main trends towards this goal, with a focus on metabolic models as central scaffolds for data integration and prediction of bioprocess outcomes. PMID:22541337

Carinhas, Nuno; Oliveira, Rui; Alves, Paula Marques; Carrondo, Manuel J T; Teixeira, Ana P

2012-04-26

471

A simple integrated system for electrophysiologic recordings in animals  

PubMed Central

This technical note describes a modification to a fundus camera that permits simultaneous recording of pattern electroretinograms (pERGs) and pattern visual evoked potentials (pVEPs). The modification consists of placing an organic light-emitting diode (OLED) in the split-viewer pathway of a fundus camera, in a plane conjugate to the subject’s pupil. In this way, a focused image of the OLED can be delivered to a precisely known location on the retina. The advantage of using an OLED is that it can achieve high luminance while maintaining high contrast, and with minimal degradation over time. This system is particularly useful for animal studies, especially when precise retinal positioning is required.

Slater, Bernard J.; Miller, Neil R.; Bernstein, Steven L.; Flower, Robert W.

2009-01-01

472

Comprehending emergent systems phenomena through direct-manipulation animation  

NASA Astrophysics Data System (ADS)

This study seeks to understand the type of interaction mode that best supports learning and comprehension of emergent systems phenomena. Given that the literature has established that students hold robust misconceptions of such phenomena, this study investigates the influence of using three types of interaction; speed-manipulation animation (SMN), post-manipulation animation (PMA) and direct-manipulation animation (DMA) for increasing comprehension and testing transfer of the phenomena, by looking at the effect of simultaneous interaction of haptic and visual channels on long term and working memories when seeking to comprehend emergent phenomena. The questions asked were: (1) Does the teaching of emergent phenomena, with the aid of a dynamic interactive modeling tool (i.e., SMA, PMA or DMA), improve students' mental model construction of systems, thus increasing comprehension of this scientific concept? And (2) does the teaching of emergent phenomena, with the aid of a dynamic interactive modeling tool, give the students the necessary complex cognitive skill which can then be applied to similar (near transfer) and/or novel, but different, (far transfer) scenarios? In an empirical study undergraduate and graduate students were asked to participate in one of three experimental conditions: SMA, PMA, or DMA. The results of the study found that it was the participants of the SMA treatment condition that had the most improvement in post-test scores. Students' understanding of the phenomena increased most when they used a dynamic model with few interactive elements (i.e., start, stop, and speed) that allowed for real time visualization of one's interaction on the phenomena. Furthermore, no indication was found that the learning of emergent phenomena, with the aid of a dynamic interactive modeling tool, gave the students the necessary complex cognitive skill which could then be applied to similar (near transfer) and/or novel, but different, (far transfer) scenarios. Finally, besides treatment condition, gender and age were also shown to be predictors of score differences; overall, males did better than females, and younger students did better than older students.

Aguirre, Priscilla Abel

473

Slotted-FIFO Communication for Asynchronous Distributed Systems  

Microsoft Academic Search

Communication protocols designed for database applications are not necessarily suitable for other applications, like multimedia communication, due to the former's requirement of reliable and ordered communication, and the latter's ability to withstand occasional losses and misordering of messages as long as real-time communication can be supported. This paper presents the slotted- FIFO communication mode that supports communication primitives for the

ROBERTO BALDONI; R OBERTO BERALDI; RAVI PRAKASH

1998-01-01

474

Augmentative and alternative communication in autism: A comparison of the Picture Exchange Communication System and speech-output technology  

Microsoft Academic Search

The purpose of this comparative efficacy study was to investigate the Picture Exchange Communication System (PECS) and a speech-generating device (SGD) in developing requesting skills, social-communicative behavior, and speech for three elementary-age children with severe autism and little to no functional speech. Requesting was selected as the primary measure while social-communicative behavior (eye contact, smiling, and physical proximity) and speech

Miriam Chacon Boesch

2011-01-01

475

Silex - The first European optical space communications system  

NASA Astrophysics Data System (ADS)

Silex (Semiconductor Laser Intersatellite Link Experiment), an experimental space communication system aimed at demonstrating in orbit, and in full scale, the feasibility and performances of optical communications between satellites, is discussed. The baseline system configuration comprises a GEO terminal aboard the ESA SAT 2 satellite and a LEO terminal aboard the French SPOT IV remote-sensing satellite. Silex uses semiconductor laser diodes operating in the 0.8-0.95-micron wavelength range as transmitters, and offers a capacity of 65 Mb/s at BER less than 10 to the -6th over a 45,000-km range on a single channel. A pointing, acquisition, and tracking system is used to align the very narrow optical antenna beams and to maintain the pointing error in the submicroradian region. The Silex terminals are designed to maximize commonality between LEO and GEO.

Laurent, B.; Camus, J. P.; Sein, E.

1989-10-01

476

On the design of chaos-based secure communication systems  

NASA Astrophysics Data System (ADS)

This paper discusses the topic of using chaotic models for constructing secure communication systems. It investigates three different case studies that use encryption/decryption functions with varying degrees of complexity and performance. The first case study explores synchronization of identical chaotic systems, which is considered the most crucial step when developing chaos-based secure communication systems. It proposes a fast mechanism for synchronizing the transmitter and the receiver that is based on the drive-response approach. The superiority and causality of this mechanism is demonstrated via contrasting its performance and practical implementation against that of the traditional method of Pecora and Carroll. The second case study explores the use of an improved cryptography method for improving the scrambling of the transmitted signals. The improvement is based on using both the transmitter states and parameters for performing the encryption. The security analysis of this method is analyzed, highlighting its advantages and limitation, via simulating intruder attacks to the communication channel. Finally, the third case study augments a parameter update law to the previous two designs such that the encryption method is more robust. It uses a decoupling technique for which the synchronization process is completely isolated from the parameter identification algorithm. The Lorenz system was used to exemplify all the suggested techniques, and the transmission of both analog and digital signals was explored, while investigating various techniques to optimize the performance of the proposed systems.

Zaher, Ashraf A.; Abu-Rezq, Abdulnasser

2011-09-01

477

Communications protocol for RF-based indoor wireless localization systems  

NASA Astrophysics Data System (ADS)

A novel application-specific communications scheme for RF-based indoor wireless localization networks is proposed. In such a system wireless badges, attached to people or objects, report positions to wireless router units. Badges have very limited communication, energy, and processing capabilities. Routers are responsible for propagating collected badge information hop-by-hop toward one central unit of the system and are significantly less constrained by battery than the badges. Each unit can radiate a special sequence of bits at selected frequencies, so that any router in the wireless neighborhood can sense, store, aggregate and forward Received Signal Strength Indicator (RSSI) information. Once the central unit receives RSSI from routers, it calculates the overall relative position of each unit in the system. This new scheme has been developed based on the Chipcon CC1010 Evaluation Module with limited communication capabilities. The implemented protocol rules allow scalability of numerous system parameters. The feasibility of the proposed protocol is simulated on a typical floor: 2-dimensional topology where routers are deployed in a grid fashion. Results show that assuming normal operation and a maximum of thousand badges the system can periodically report about every five seconds. Different scenarios are compared, and the proposed scheme is demonstrated to meet strict reliability requirements while providing energy-efficient badges and an acceptable level of latency.

Kasza, Tamas; Shahsavari, Mehdi M.; Kepuska, Veton; Pinzone, Maria

2006-06-01

478

Animals, Animals, Animals  

NSDL National Science Digital Library

Third grade students may use this page for additional resources for their animal research. Use these links as part of your animal research: Desert Biome What Swims Beneath: Creatures of the Sea Scaly Surprises (ScienceWorld) Manatees AnimalPlanet.com: Mammal Guide Endangered Species Picture Book MIKIDS!: Mammals ZOOM MAMMALS - EnchantedLearning.com Smithsonian National Zoological Park Enchanted Learning: Zoom Sharks Shark School Sharks: Did You Know? Sharks: Myth and Mystery The Secret World of Sharks and Rays ...

Laz, Mrs.

2006-12-16

479

IRECIN Nano-satellite communication system and ground segment  

NASA Astrophysics Data System (ADS)

On board resources necessary to perform the mission tasks are very limited in nano-satellites. This paper proposes a real-time multi-processing system for the communication system between ground segment and IRECIN nano-satellite. The first microprocessor is devoted to interface to the rice-transceiver subsystem decoding packet information and the second one is in charge to communicate with the other subsystems through I2C bus. It uses UHF band and less than 1 W in RF. All electronic components are SMD technology in order to reduce weight and size. The realized electronic boards are completely developed, realized and tested at the Vitrociset S.P.A. under control of Research and Develop Group. This multi-processor system even allows managing the tasks of the microprocessor eventually damaged, the microprocessor still working takes the functionalities of the first one using simpler algorithms. This choice assures an increasing nano-satellite life time. Moreover, the depicted method allows to free the on-board main microprocessor from the control functions of the communication data, increasing its communication capabilities with the other subsystems. The proposed system is implemented on the IRECIN, a modular nano-satellite weighing less than 1.5 kg, constituted by 16 external sides with surface-mounted solar cells and three internal Al plates, kept together by four steel bars. Lithium-ion batteries are added for eclipse operations. Attitude is determined by two three-axis magnetometers and the solar panel data. Control is provided by an active magnetic control system. The spacecraft will be spin-stabilized with the spin-axis normal to the orbit.

Ferrante, M.; Povia, M.; di Ciolo, L.; Ortenzi, A.; Petrozzi, M.

2005-01-01

480

Communications and control for electric power systems: Final report  

SciTech Connect

This report is a summary of some of the work done on the Communications and Control project, with particular emphasis on the achievements during the years 1986--1996. During those years, the project moved away from concern with dispersed storage and generation and its impact on power system operation (the team was responsible for studies in this area, and for making a power system simulator that included DSG), and became involved in more concrete work aimed at applying high-tech solutions to problems of power system communications and control. This report covers work done at JPL on the following topics: (1) the measurement of electric and magnetic fields, both ac and dc; (2) the use of optical power to supply low-power electronics; (3) the design of a fault-tolerant communication system designed for distribution automation; and (4) a digital phase locked loop that allows the use of low-power transmitting electronics to recreate a good-quality signal at the receiver. In a report of this kind, only the results and highlights of the work are described.

Kirkham, H.

1998-04-01

481

Blood compatible microfluidic system for pharmacokinetic studies in small animals.  

PubMed

New radiotracer developments for nuclear medicine imaging require the analysis of blood as a function of time in small animal models. A microfluidic device was developed to monitor the radioactivity concentration in the blood of rats and mice in real time. The microfluidic technology enables a large capture solid angle and a reduction in the separation distance between the sample and detector, thus increasing the detection efficiency. This in turn allows a reduction of the required detection volume without compromising sensitivity, an important advantage with rodent models having a small total blood volume (a few ml). A robust fabrication process was developed to manufacture the microchannels on top of unpackaged p-i-n photodiodes without altering detector performance. The microchannels were fabricated with KMPR, an epoxy-based photoresist similar to SU-8 but with improved resistance to stress-induced fissuring. Surface passivation of the KMPR enables non-diluted whole blood to flow through the channel for up to 20 min at low speed without clotting. The microfluidic device was embedded in a portable blood counter with dedicated electronics, pumping unit and computer control software for utilisation next to a small animal nuclear imaging scanner. Experimental measurements confirmed model predictions and showed a 4- to 19-fold improvement in detection efficiency over existing catheter-based devices, enabling a commensurate reduction in sampled blood volume. A linear dose-response relationship was demonstrated for radioactivity concentrations typical of experiments with rodents. The system was successfully used to measure the blood input function of rats in real time after radiotracer injection. PMID:23000896

Convert, Laurence; Baril, Frédérique Girard; Boisselle, Vincent; Pratte, Jean-François; Fontaine, Réjean; Lecomte, Roger; Charette, Paul G; Aimez, Vincent

2012-11-21

482

Effects of Implementing the Picture Exchange Communication System (PECS) with Adults with Developmental Disabilities and Severe Communication Deficits  

ERIC Educational Resources Information Center

The purpose of this study is to evaluate the effects of "Picture Exchange Communication System" (PECS) training, using a multiple baseline design on the independent initiations of three adults with developmental disabilities and severe communication deficits. All participants increased their independent initiations, although at different levels of…

Conklin, Carl G.; Mayer, G. Roy

2011-01-01

483

Augmentative and Alternative Communication in Autism: A Comparison of the Picture Exchange Communication System and Speech-Output Technology  

ERIC Educational Resources Information Center

|The purpose of this comparative efficacy study was to investigate the Picture Exchange Communication System (PECS) and a speech-generating device (SGD) in developing requesting skills, social-communicative behavior, and speech for three elementary-age children with severe autism and little to no functional speech. Requesting was selected as the…

Boesch, Miriam Chacon

2011-01-01

484

A process for free-space laser communications system design  

NASA Astrophysics Data System (ADS)

We present a design methodology for free-space laser communications systems. The first phase includes a characterization through numerical simulations of the channel to evaluate the range of extinction and scintillation. The second phase is the selection of fade mitigation schemes, which would incorporate pointing, acquisition, tracking, and communication system parameters specifically tailored to the channel. Ideally, the process would include sufficient flexibility to adapt to a wide range of channel conditions. We provide an example of the successful application of this design approach to a recent set of field experiments. This work was sponsored by the Department of Defense, RRCO DDR&E, under Air Force Contract FA8721-05-C-0002. Opinions, interpretations, conclusions and recommendations are those of the authors and are not necessarily endorsed by the United States Government.

Walther, Frederick G.; Moores, John D.; Murphy, Robert J.; Michael, Steven; Nowak, George A.

2009-08-01

485

Development of a globally harmonized system for hazard communication.  

PubMed

As a result of an international mandate adopted in 1992 at the United Nations Conference on the Environment and Development (UNCED), a globally harmonized system (GHS) for hazard communication has been developed. The work has involved significant contributions from numerous countries and international organizations. The GHS is designed to be a common and coherent approach to defining and classifying hazards of chemicals, and communicating information on labels and substance data sheets. The target audiences for the information include workers, consumers, transport workers, and emergency responders. The GHS can provide an informational infrastructure for countries establishing national, comprehensive programs for the sound management of chemicals. Adoption of the GHS by the United Nations is expected in December 2002, and it will be available for countries to adopt in 2003. The purpose of this discussion is to describe the work to develop the system, the primary components of the GHS, and efforts to promote implementation. PMID:12971700

Silk, Jennifer C

2003-08-01

486

Design constraints of high-bit-rate soliton communication systems  

NASA Astrophysics Data System (ADS)

We have examined the main constraints on the design of single-channel, high-capacity soliton communication systems. In the average soliton regime, the Gordon-Haus timing jitter limits the bit rate to less than 7 Gb/s for transoceanic fiber links, while for shorter transmission distances the main limitation is fiber perturbations arising from discrete in-line amplification. The use of dispersion-decreasing fibers and of periodic optical phase conjugation for jitter control can increase significantly the capacity of soliton communication systems. We found that the third-order dispersion assumes a prominent role in this case. Reducing this effect sufficiently, the main constraint becomes the soliton-soliton interactions and bit rates superior to 110 Gb/s can be achieved for amplifier spacings less than 80 km. For higher amplifier spacings the bit rate is limited by the Raman induced timing jitter.

Ferreira, Mario F.

1999-10-01

487

Non-invasive, in vivo fluorescent imaging of the nervous system in whole living animal  

US Patent & Trademark Office Database

A method is disclosed involving detecting the expression of a fluorescent protein of interest in an animal, wherein the animal is a transgenic animal having in its genome nucleic acid encoding said fluorescent protein operably linked to promoter nucleic acid from a protein that is normally expressed in the nervous system of the animal, the method comprising the step of non-invasively detecting fluorescence from said protein when expressed in said animal.

2013-08-20

488

A Dual Communication and Imaging Underwater Acoustic System  

NASA Astrophysics Data System (ADS)

A dual communication and imaging underwater acoustic system is proposed and developed throughout this dissertation. Due to the wide variation in underwater channel characteristics, the research here focuses more on robustness to multipath in the shallow underwater acoustic environment, rather than high bit-rate applications and signaling schemes. Lower bit-rate (in the hundreds of bits per second (bps) to low kbps), applications such as the transfer of ecological telemetry data, e.g. conductivity or temperature data, are the primary focus of this dissertation. The parallels between direct sequence spread spectrum in digital communication and pulse-echo with pulse compression in imaging, and channel estimation in communication and range profile estimation in imaging are drawn, leading to a unified communications and imaging platform. A digital communication algorithm for channel order and channel coefficient estimation and symbol demodulation using Matching Pursuit (MP) with Generalized Multiple Hypothesis Testing (GMHT) is implemented in programmable DSP in real time with field experiment results in varying underwater environments for the single receiver (Rx), single transmitter (Tx) case. The custom and off-the-shelf hardware used in the single receiver, single transmitter set of experiments are detailed as well. This work is then extended to the single-input multiple-output (SIMO) case, and then to the full multiple-input multiple-output (MIMO) case. The results of channel estimation are used for simple range profile imaging reconstructions. Successful simulated and experimental results for both transducer array configurations are presented and analyzed. Non-real-time symbol demodulation and channel estimation is performed using experimental data from a scaled testing environment. New hardware based on cost-effective fish-finder transducers for a 6 Rx--1 Tx and 6 Rx--4 Tx transducer array is detailed. Lastly, in an application that is neither communication nor imaging, a generalized successive interference cancellation (GSIC)-based localization algorithm is used to localize discrete scatterers which are assumed to be more prominent than the surrounding clutter. Theory and experimental results are provided to support the feasability of GSIC localization for use with a dual communication and imaging underwater acoustic system.

Fu, Tricia C.

489

Speech and gesture share the same communication system.  

PubMed

Humans speak and produce symbolic gestures. Do these two forms of communication interact, and how? First, we tested whether the two communication signals influenced each other when emitted simultaneously. Participants either pronounced words, or executed symbolic gestures, or emitted the two communication signals simultaneously. Relative to the unimodal conditions, multimodal voice spectra were enhanced by gestures, whereas multimodal gesture parameters were reduced by words. In other words, gesture reinforced word, whereas word inhibited gesture. In contrast, aimless arm movements and pseudo-words had no comparable effects. Next, we tested whether observing word pronunciation during gesture execution affected verbal responses in the same way as emitting the two signals. Participants responded verbally to either spoken words, or to gestures, or to the simultaneous presentation of the two signals. We observed the same reinforcement in the voice spectra as during simultaneous emission. These results suggest that spoken word and symbolic gesture are coded as single signal by a unique communication system. This signal represents the intention to engage a closer interaction with a hypothetical interlocutor and it may have a meaning different from when word and gesture are encoded singly. PMID:16005477

Bernardis, Paolo; Gentilucci, Maurizio

2005-07-07

490

Feasibility study of a personal communications system IRIDIUM-like  

NASA Astrophysics Data System (ADS)

A candidate architecture applicable to personal communications systems, via Low Earth Orbit (LEO) satellites is outlined. The concept of the IRIDIUM Motorola system has been adopted as derived from the available public documentation. The following topics are covered: system architecture (IRIDIUM like concept) and scenario; constellation characteristics, user links, coverage and frequency reuse; Leostar-E spacecraft and payload architecture definition; traffic management (access, routing, networking); and organization aspects and manufacturing strategies. Additional efforts are required in order to assess a convenient cost/technology tradeoff.

Caporicci, L.; Delricco, R.; Digirolamo, S.; Soddu, C.; Rondinelli, G.

1993-01-01

491

Corona: a communication service for scalable, reliable group collaboration systems  

Microsoft Academic Search

We consider the problem of providing communication pro- tocol support for large-scale group collaboration systems for use in environments such as the Internet which are subject to packet loss, wide variations in end-to-end delays, and transient partitions. We identify a set of requirements that are critical for the design of such group collaboration sys- tems. These include dynamic awareness notifications,

Robert W. Hall; Amit G. Mathur; Farnam Jahanian; Atul Prakash; Craig Rassmussen

1996-01-01

492

The capacity of an UWB multiple-access communications system  

Microsoft Academic Search

In this paper we compute the channel capacity of M-ary pulse position modulation ultra-wideband (UWB) communications over multiple-access channels. Under certain assumptions, the multiple-access noise component at the receiver can be modeled as Gaussian. An expression for the signal-to-noise ratio is developed for UWB utilizing rectangular pulses. The information theoretic capacity of the UWB system is expressed as a function

Li Zhao; Alexander M. Haimovich

2002-01-01

493

Robust noncoherent PN-code acquisition for CDMA communication systems  

Microsoft Academic Search

We are proposing a new noncoherent pseudonoise code acquisition method for code-division multiple-access (CDMA) mobile communication systems. The proposed method employs two digital matched filters, and the code acquisition is based on a double dwell process. Through serial cascading of the dual-matched filters, the proposed code acquisition method does not lose the track of the incoming sequence even after returning

Jung H. Kim; Shanuj V. Sarin; Moritoshi Yasunaga; Hyunseo Oh

2001-01-01

494

Multilayer thin-film coatings for optical communication systems  

Microsoft Academic Search

Recent developments in thin-film coatings for optical communication systems are reviewed. Particular emphasis is given to thin-film designs with dispersion related to the photonic crystal superprism effect. A single dispersive coating may be used for multiplexing or demultiplexing several wavelength channels by spatial beam shifting. ?2004 Optical Society of America OCIS codes: (310.0310) Thin films, (060.2340) Fiber optics components; (260.2030)

Martina Gerken; David A. B. Miller

2004-01-01

495

Narrowband Interference Avoidance in OFDM-Based UWB Communication Systems  

Microsoft Academic Search

In this letter we present a new method for mitigating narrowband interference in orthogonal frequency-division multiplexing-based ultra-wideband communication systems. The proposed narrowband interference avoidance (NBIA) method performs spectral shaping of the transmitted signal using binary signature sequences with minimum total squared correlation (TSC) to avoid the narrowband interfering signal. We illustrate the proposed method with plots that show the spectrum

Dimitrie C. Popescu; Prasad Yaddanapudi

2007-01-01

496

A variable-rate filtering system for digital communications  

Microsoft Academic Search

We propose an efficient programmable transmit-receive digital filter structure consisting of a pulse shaping filter (PSF) and a cascaded integrator-comb (CIC) filter which is applicable to variable-rate digital communication systems. The CIC structure is a hardware-efficient means of constructing programmable interpolation and decimation filters, but it introduces a large amount of intersymbol interference (ISI). We solve this problem by proposing

L. Wasserman

1999-01-01

497

HIBI v.2 Communication Network for System-on-Chip  

Microsoft Academic Search

This paper presents a communication network targeted for complex system-on-chip (SoC) and network-on-chip (NoC) designs. The Heterogeneous IP Block Interconnection (HIBI) aims at maximum effi- ciency and minimum energy per transmitted bit combined with quality-of-service (QoS) in transfers. Other features include support for hierarchical topologies with several clock domains, flexible scalability, and runtime recon- figuration of network parameters. HIBI is

Erno Salminen; Vesa Lahtinen; Tero Kangas; Jouni Riihimäki; Kimmo Kuusilinna; Timo D. Hämäläinen

2004-01-01

498

Using a Course Management System to Improve Classroom Communication  

NSDL National Science Digital Library

Unfortunately, commercial Course Management Systems (CMS) are often expensive to purchase and maintain, removing them from the reach of many K-12 schools. An alternative is Moodle--Modular Object-Oriented Dynamic Learning Environment-- a free, open-source software program that provides teachers with a variety of tools to support student learning and parental communication. This article takes an in-depth look at Moodle and discusses how to utilize this internet technology in your science classroom.

Pfaffman, Jay; Perkins, Matthew

2006-10-01

499

Adaptive Morse code communication system for severely disabled individuals  

Microsoft Academic Search

Morse code with an easy-to-operate, single switch input system has been shown to be an excellent communication adaptive device. Because maintaining a stable typing rate is not easy for the disabled, the automatic recognition of Morse code is difficult. Therefore, a suitable adaptive automatic recognition method is needed. This paper presents the application of a Least-Mean-Square algorithm to adaptive Morse

C. H. Yang

2000-01-01

500

Picture Archiving and Communication Systems planning: A methodology  

Microsoft Academic Search

This article presents the Picture Archiving and Communication Systems (PACS) planning methodology used by the Department of\\u000a Defense’s (DOD) Joint Imaging Technology Project Office (JITPO). This methodology evaluates four areas of PACS planning and\\u000a implementation: strategic planning, clinical scenario planning, installation planning, and implementation planning. The first\\u000a task is to develop a PACS team, from the local facility, that will

Paul J. Unkel; Philip D. Shelton; Rohit Inamdar

1999-01-01