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1

Animal and Human Communication.  

ERIC Educational Resources Information Center

Several misconceptions regarding the status of human communication systems relative to the systems of other animals are discussed in this paper. Arguments are offered supporting the expansion of the communication discipline to include the study of the communication systems of other species. The "communicative continuity" view which ranks man at…

Rummel, Lynda

2

Exms: an animated and avatar-based messaging system for expressive peer communication  

Microsoft Academic Search

While many synchronous computer-mediated communication systems have failed to encourage users to make use of the expressive capabilities of their avatars, asynchronous systems may hold better chance. This paper reports on the design and user study of a message system that allows users to concatenate and annotate avatar animations and send them to peers. During three weeks, a group of

Per Persson

2003-01-01

3

Animal Communications Through Seismic Vibrations  

SciTech Connect

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.

Hill, Peggy (University of Tulsa) [University of Tulsa

2001-05-02

4

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

5

Communication Engineering Systems Introduction to Communication Systems  

E-print Network

Communication Engineering Systems Introduction to Communication Systems (1) Assoc .. 4 #12;Outline Variety of Today's Communication SystemsVariety of Today s Communication Systems Design Challenges Basic of Communication Systems F d t l Li it tiFundamental Limitation Bandwidth

Kovintavewat, Piya

6

Communication Systems Chair of Communication Systems  

E-print Network

1 | 36 Communication Systems 24th lecture Chair of Communication Systems Department of Applied Sciences University of Freiburg 2009 #12;2 | 36 Communication Systems last to final lecture Extension;3 | 36 Communication Systems GSM interfaces and components #12;4 | 36 Communication Systems GSM

Schindelhauer, Christian

7

Communication Systems Chair of Communication Systems  

E-print Network

1 | 28 Communication Systems 15th lecture Chair of Communication Systems Department of Applied Sciences University of Freiburg 2008 #12;2 | 28 Communication Systems Organization Last lecture networking issues Starting into second part of "Communication Systems" ­ I. Data and voice communication

Schindelhauer, Christian

8

Communication Systems Chair of Communication Systems  

E-print Network

1 | 47 Communication Systems 11th lecture Chair of Communication Systems Department of Applied Sciences University of Freiburg Winter Term 2008 #12;2 | 47 Communication Systems Organization and Q&A Any by these protocols? #12;3 | 47 Communication Systems open shortest path first (OSPF) Last lecture: OSPF

Schindelhauer, Christian

9

Communication Systems Chair of Communication Systems  

E-print Network

1 | 47 Communication Systems 13th lecture Chair of Communication Systems Department of Applied Sciences University of Freiburg 2008 #12;2 | 45 Communication Systems Organization and Q&A Any questions;3 | 47 Communication Systems What is DNS? Imagine: Try to remember the telephone numbers of your friends

Schindelhauer, Christian

10

Communication Systems Chair of Communication Systems  

E-print Network

1 | 29 Communication Systems 3rd lecture Chair of Communication Systems Department of Applied Sciences University of Freiburg Winter Term 2008 #12;2 | 29 Communication Systems Organization and Q&A Any Ethernet adapter is plugged into the old-standard PCI? #12;3 | 29 Communication Systems 10GBit/s Ethernet

Schindelhauer, Christian

11

Communication Systems Chair of Communication Systems  

E-print Network

1 | 69 Communication Systems 22nd lecture Chair of Communication Systems Department of Applied Sciences University of Freiburg 2009 #12;2 | 69 Communication Systems Q&A How does the codec used in a Vo of security implications does SIP has? #12;3 | 69 Communication Systems plan for this lecture Voice over IP

Schindelhauer, Christian

12

Communication Systems Chair of Communication Systems  

E-print Network

1 | 27 Communication Systems 21st lecture Chair of Communication Systems Department of Applied NATed and proxied HTTP connection of a client? Communication Systems Q&A #12;3 | 27 3rd and last part of the communication systems lecture: digital telephony For a rather long time telephone and data networks were

Schindelhauer, Christian

13

Communication Systems Chair of Communication Systems  

E-print Network

1 | 24 Communication Systems 20th lecture Chair of Communication Systems Department of Applied Sciences University of Freiburg 2009 #12;2 | 24 Communication Systems Organization We will offer an oral to a bounded constant Communication systems network security ­ firewalls, packet filtering #12;4 | 24 Packet

Schindelhauer, Christian

14

Communication Systems Chair of Communication Systems  

E-print Network

1 | 18 Communication Systems 4th lecture Chair of Communication Systems Department of Applied Sciences University of Freiburg Winter Term 2008 #12;2 | 18 Communication Systems Organization and Q&A Any in Ethernet channel bonding, but why might it a be a good idea nevertheless? #12;3 | 18 Communication Systems

Schindelhauer, Christian

15

Communication Systems Chair of Communication Systems  

E-print Network

1 | 29 Communication Systems 9th lecture Chair of Communication Systems Department of Applied Sciences University of Freiburg Winter Term 2008 #12;2 | 29 Communication Systems Organization and Q&A Any? ­ Why are the header checksums of TCP and UDP to be recalculated? #12;3 | 29 Communication Systems

Schindelhauer, Christian

16

Communication Systems Chair of Communication Systems  

E-print Network

1 | 29 Communication Systems 14th lecture Chair of Communication Systems Department of Applied Sciences University of Freiburg 2008 #12;2 | 29 Communication Systems Organization and Q&A Any questions? ­ How is this number is increased nevertheless? #12;3 | 29 Communication Systems Operating the database

Schindelhauer, Christian

17

Communication Systems Chair of Communication Systems  

E-print Network

1 | 19 Communication Systems 10th lecture Chair of Communication Systems Department of Applied Sciences University of Freiburg Winter Term 2008 #12;2 | 19 Communication Systems Organization and Q&A Any start? ­ Which other protocols use multicast for message exchange? #12;3 | 19 Communication Systems

Schindelhauer, Christian

18

Communication Systems Chair of Communication Systems  

E-print Network

1 | 27 Communication Systems 12th lecture Chair of Communication Systems Department of Applied Sciences University of Freiburg 2008 #12;2 | 27 Communication Systems Organization and Q&A Any questions addresses was dropped? #12;3 | 27 Communication Systems IP v6 ­ header format Some important changes within

Schindelhauer, Christian

19

Communication Systems Chair of Communication Systems  

E-print Network

1 | 34 Communication Systems 7th lecture Chair of Communication Systems Department of Applied Sciences University of Freiburg Winter Term 2008 #12;2 | 34 Communication Systems Organization and Q&A Any is not configured at the client yet)? #12;3 | 34 Communication Systems Organization and Q&A Why wouldn

Schindelhauer, Christian

20

Communication Systems Chair of Communication Systems  

E-print Network

1 | 32 Communication Systems 8th lecture Chair of Communication Systems Department of Applied Sciences University of Freiburg Winter Term 2008 #12;2 | 32 Communication Systems Organization and Q&A Any Communication Systems Organization and Q&A Please specify what kind of an IP address/network this is: ­ 0

Schindelhauer, Christian

21

Communication Systems Chair of Communication Systems  

E-print Network

1 | 26 Communication Systems 6th lecture Chair of Communication Systems Department of Applied Sciences University of Freiburg Winter Term 2008 #12;2 | 26 Communication Systems Organization and Q&A Any a smaller MTU rather than the standard one introduce? #12;3 | 26 Communication Systems Organization and Q

Schindelhauer, Christian

22

Communication Systems Chair of Communication Systems  

E-print Network

1 | 45 Communication Systems 2nd lecture Chair of Communication Systems Department of Applied Sciences University of Freiburg Winter Term 2008 #12;2 | 45 Communication Systems Organization and Q&A Everybody should have gotten two emails of the comsysWS08 mailing list ­ Communicating organizational issues

Schindelhauer, Christian

23

Communication Systems Chair of Communication Systems  

E-print Network

1 | 19 Communication Systems 19th lecture Chair of Communication Systems Department of Applied Sciences University of Freiburg 2009 #12;2 | 19 Communication Systems Organization Last lectures we ensure this way, that nobody can read/alter the packets of a communication during transit We do

Schindelhauer, Christian

24

Communication Systems Chair of Communication Systems  

E-print Network

1 | 18 Communication Systems 17th lecture Chair of Communication Systems Department of Applied Sciences University of Freiburg 2009 #12;2 | 18 Communication Systems Organization Exam: Please do in the practical part Concepts of certification and authorities useful in several setups #12;3 | 18 Communication

Schindelhauer, Christian

25

Communication Systems last lecture  

E-print Network

1 | 70 Communication Systems last lecture Chair of Communication Systems Department of Applied Sciences University of Freiburg 2009 #12;2 | 70 Communication Systems final lecture Start with last part, power control and hand-over ­ Authentication and security #12;3 | 70 Communication Systems GSM

Schindelhauer, Christian

26

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

27

Introduction The structure and function of animal communication signals, like  

E-print Network

200 Introduction The structure and function of animal communication signals, like all traits, can that animals allocate to communication signals depends on a suite of physical and life history factors (Fig.1 of the animal's energy budget. Where the interests of signaler and receiver are strategically aligned (Searcy

Stoddard, Philip

28

Communication Systems Chair of Communication Systems  

E-print Network

(standard CRC) ­ Flag 0111 1110 Communication Systems point-to-point protocol #12;9 | 29 PPP byte stuffing Serial Line Internet Protocol (SLIP) or Telco standards such as Link Access Protocol Balanced (LAPB) part configuration ­ Looped link detection via magic numbers in control protocol Communication Systems point

Schindelhauer, Christian

29

Creating Automated Interactive Video Playback for Studies of Animal Communications  

E-print Network

Video playback is a technique used to study the visual communication and behaviors of animals. While video playback is a useful tool, most experiments lack the ability for the visual stimulus to interact with the live animal. The limited number...

Butkowski, Trisha

2010-01-16

30

Redefining animal signaling: influence versus information in communication  

E-print Network

Redefining animal signaling: influence versus information in communication Michael J. Owren · Drew � Springer Science+Business Media B.V. 2010 Abstract Researchers typically define animal signaling influence rather than transmission of encoded information the central function of animal signaling

Rendall, Drew

31

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

32

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

33

Binary and Communication Systems  

NSDL National Science Digital Library

Students are introduced to the concept of binary coding as a language and its practical applications in digital and communication systems.This project gives students a deeper appreciation for communication systems and an understanding of how binary symbols are used to transmit information.

Center For Engineering Educational Outreach

34

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.

35

Improving Communications Systems  

NASA Technical Reports Server (NTRS)

The Space Shuttle has many communications systems which are used throughout a typical mission. Given that the radio spectrum has become increasingly congested, the ability to hear extremely weak signals requires greater receiver sensitivity. Dryden Flight Research Center approached Angle Linear, a manufacturer of linear radio frequency products and peripherals for communications, to solve the problem. The solution was a receiving preamplifier specially crafted for NASA. Communications with the Space Shuttle are now more reliable,with Dryden being able to also support local missions without purchasing additional equipment. The work has carried over into the Mir Space Station communication support effort and is under evaluation by other NASA centers. The company's preamplifier line was greatly expanded to cover a broader range of frequencies, providing the same sensational improvement to other areas of communication including business, government, trucking, land mobile, cellular and broadcast.

1997-01-01

36

Digital communication system  

NASA Technical Reports Server (NTRS)

A digital communication system is reported for parallel operation of 16 or more transceiver units with the use of only four interconnecting wires. A remote synchronization circuit produces unit address control words sequentially in data frames of 16 words. Means are provided in each transceiver unit to decode calling signals and to transmit calling and data signals. The transceivers communicate with each other over one data line. The synchronization unit communicates the address control information to the transceiver units over an address line and further provides the timing information over a clock line. A reference voltage level or ground line completes the interconnecting four wire hookup.

Monford, L. G., Jr. (inventor)

1974-01-01

37

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

2007-01-01

38

Risk communication related to animal products derived from biotechnology.  

PubMed

Previous chapters of this review have dealt with the key considerations related to the application of biotechnology in veterinary science and animal production. This article explores the theory and practice of risk communication and sets out the basic principles for good risk communication when dealing with new technologies, uncertainty, and cautious and sceptical consumers. After failure to communicate with consumers and stakeholders about the risk to human health from bovine spongiform encephalopathy (BSE) in the 1990s, Government Agencies in the United Kingdom have made significant improvements in risk communication. The official inquiry that followed the BSE crisis concluded that a policy of openness was the correct approach, and this article emphasises the importance of consultation, consistency and transparency. There are, however, many different factors that affect public perception of risk (religious, political, social, cultural, etc.) and developing effective risk communication strategies must take all of these complex issues into consideration. PMID:16110884

McCrea, D

2005-04-01

39

Airborne wireless communication systems, airborne communication methods, and communication methods  

DOEpatents

An airborne wireless communication system includes circuitry configured to access information describing a configuration of a terrestrial wireless communication base station that has become disabled. The terrestrial base station is configured to implement wireless communication between wireless devices located within a geographical area and a network when the terrestrial base station is not disabled. The circuitry is further configured, based on the information, to configure the airborne station to have the configuration of the terrestrial base station. An airborne communication method includes answering a 911 call from a terrestrial cellular wireless phone using an airborne wireless communication system.

Deaton, Juan D. (Menan, ID); Schmitt, Michael J. (Idaho Falls, ID); Jones, Warren F. (Idaho Falls, ID)

2011-12-13

40

Space Launch System Animation  

NASA Video Gallery

NASA is ready to move forward with the development of the Space Launch System -- an advanced heavy-lift launch vehicle that will provide an entirely new national capability for human exploration be...

41

Neural communication systems Pter Andrs  

E-print Network

Neural communication systems Péter András School of Computing Science University of Newcastle communication systems. Such systems use pattern languages formulated as probabilistic continuation rules that determine which communications follow other communications. We apply this framework to define neural

Andras, Peter

42

Wireless Headset Communication System  

NASA Technical Reports Server (NTRS)

System combines features of pagers, walkie-talkies, and cordless telephones. Wireless headset communication system uses digital modulation on spread spectrum to avoid interference among units. Consists of base station, 4 radio/antenna modules, and as many as 16 remote units with headsets. Base station serves as network controller, audio-mixing network, and interface to such outside services as computers, telephone networks, and other base stations. Developed for use at Kennedy Space Center, system also useful in industrial maintenance, emergency operations, construction, and airport operations. Also, digital capabilities exploited; by adding bar-code readers for use in taking inventories.

Lau, Wilfred K.; Swanson, Richard; Christensen, Kurt K.

1995-01-01

43

A system for algorithm animation  

Microsoft Academic Search

A software environment is described which provides facilities at a variety of levels for “animating” algorithms: exposing properties of programs by displaying multiple dynamic views of the program and associated data structures. The system is operational on a network of graphics-based, personal workstations and has been used successfully in several applications for teaching and research in computer science and mathematics.

Marc H. Brown; Robert Seclgewick

1984-01-01

44

Communication systems for load management  

SciTech Connect

Load management and distribution automation schemes of electric utilities require an extensive, reliable and economical communication system. Several communication technologies have been investigated, tested and employed to optimize these schemes. This paper examines these communication techniques, discusses advantages and disadvantages of each with a special emphasis on power line carrier system (PLC), and finally presents recommendations and suggests areas for future research.

Sherif, Y.S.; Zahir, S.S.

1985-12-01

45

Satellite communications system  

NASA Astrophysics Data System (ADS)

A satellite communication system is disclosed which provides an increased probability of reception by selective call receivers. In carrying out the invention in one form, there is provided a method comprising the step of relaying, from two or more locations via at least one satellite, a transmission to a receiver. By relaying the information being transmitted from two different locations (angles) at different points in time, the probability of reception is increased. Programming means are provided for determining the first and second locations and times of transmitting the information.

Schwendeman, Robert J.

1993-04-01

46

Real-time speech animation system  

E-print Network

We optimize the synthesis procedure of a videorealistic speech animation system [7] to achieve real-time speech animation synthesis. A synthesis rate must be high enough for real-time video streaming for speech animation ...

Fu, Jieyun

2011-01-01

47

Digital and analog communication systems  

NASA Technical Reports Server (NTRS)

The book presents an introductory treatment of digital and analog communication systems with emphasis on digital systems. Attention is given to the following topics: systems and signal analysis, random signal theory, information and channel capacity, baseband data transmission, analog signal transmission, noise in analog communication systems, digital carrier modulation schemes, error control coding, and the digital transmission of analog signals.

Shanmugam, K. S.

1979-01-01

48

Degree project in Communication Systems  

E-print Network

Degree project in Communication Systems First level, 15.0 HEC Stockholm, Sweden R A F I D K A R I M and Communication Technology (ICT) KTH Royal Institute of Technology Stockholm, Sweden #12;#12;i Abstract Most major cell phone manufacturers have been releasing cell phones equipped with Near Field Communication (NFC

Maguire Jr., Gerald Q.

49

The Picture Exchange Communication System  

Microsoft Academic Search

A variety of strategies have been used to help children with autism acquire functional communication skills. The Picture Exchange Communication System (PECS) is a unique communication training program that was developed as a means of circumventing some shortcomings associatd with these strategies. A description of the steps within PECS is provided. Long-term group data have indicated that a large proportion

Andrew S. Bondy; Lori A. Frost

1994-01-01

50

Crises Communication Systems at UCAR  

E-print Network

Crises Communication Systems at UCAR Presented to the UCAR Board of Trustees- Audit and Finance Committee By Stephen Sadler, UCAR Director Safety and Site Services #12;Types of Crises Communication or Program Emergency · Natural Event · Political #12;Communication Issues During A Crises · May occur during

51

Information Systems and Business Communication.  

ERIC Educational Resources Information Center

Intended to provide orientation about the integration of business communication, business systems, and the researching and teaching of business communication, this books offers articles on a variety of topics concerning business communication. Titles of the articles and their authors are as follows: (1) "Office Technology: Voice Store-and-Forward"…

Beswick, Raymond W., Ed.; Williams, Alfred B., Ed.

52

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

53

Communications systems checkout study  

NASA Technical Reports Server (NTRS)

The results and conclusions of an engineering study of Space Station communications subsystem checkout are reported. The primary purpose of the study is to recommend specific guidelines and constraints for the design and utilization of the communications subsystem leading to a practical and effective means of onboard checkout implementation. Major study objectives are as follows: (1) identify candidate communications subsystem checkout concepts, (2) determine implementation impacts of feasible concepts, (3) evaluate practicality and effectiveness of alternative concepts, (4) propose baseline modifications to accommodate preferred concepts, and (5) recommend areas for additional investigation. In addition, study results are interpreted, where appropriate, in terms of their applicability to checkout of Shuttle-Orbiter communications subsystem.

Ginter, W. G.

1972-01-01

54

Alma: a Generic Program Animation System  

Microsoft Academic Search

In this paper, a system for program animation is presented. Alma system receives as input a computer program and produces a sequence of visualizations that will describe it s functionality. The system generates automatically progra m animations basing this process on the internal representa- tion of those programs. We do not rely upon any source program annotations (visual\\/animation statements, or

Maria Joao Varanda Pereira; Pedro Rangel Henriques

2003-01-01

55

Degree project in Communication Systems  

E-print Network

Degree project in Communication Systems Second level, 30.0 HEC Stockholm, Sweden M U H A M M A D I, Sweden #12;#12;i Abstract A Controller Area Network (CAN) is a multi-master serial data communication bus in the Volvo group which develops and manufactures steer-by-wire systems based on the CAN technology, wishes

Maguire Jr., Gerald Q.

56

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

57

Ultramicrowave communications system, phase 3  

NASA Technical Reports Server (NTRS)

The ultramicrowave communications system program investigated the feasibility of a solid state system that meets the projected space to space requirements, while using the advantages of the 100 to 200 GHz band. The program successfully demonstrated a laboratory model of a high frequency communications system operating between 100 to 200 GHz. In the process, vendor claims for performance specifications of discrete components were evaluated, and a window was provided into system design and integration problems.

1981-01-01

58

TETRAD: an on-line telematic surveillance system for animal transports  

Microsoft Academic Search

A new concept for on-line surveillance of animal transports is presented, comprising telemetry and wireless data communication. The concept has two major objectives: (1) to improve animal disease prevention and control and (2) to enable monitoring of animal welfare during transport. The system allows on-line collection on the transport lorry of data with respect to animal identification, body temperature and

R Geers; H. W Saatkamp; K Goossens; B Van Camp; J Gorssen; G Rombouts; P Vanthemsche

1998-01-01

59

Degree project in Communication Systems  

E-print Network

Degree project in Communication Systems Second level, 30.0 HEC Stockholm, Sweden PAV E L L E G O N of Information and Communication Technology KTH Royal Institute of Technology Stockholm, Sweden July 4, 2012 wireless cell. The performance of wireless equipment manufactured by several vendors has been measured

Maguire Jr., Gerald Q.

60

Natural communication with information systems  

Microsoft Academic Search

Pervasive networking and sophisticated computing open opportunities for collaborative information processing independent of time and space. In this instance the information system becomes an enhancer of human intellect, as well as a mediator for communication among participants. The human user favors the sensory dimensions of sight, sound, and touch as primary channels of communication. Machines that can accommodate these modes

IVAN MARSIC; ATTILA MEDL; JAMES FLANAGAN

2000-01-01

61

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

62

Designing complementary communication systems  

E-print Network

We have long assumed that being face to face is the best environment for social interaction. But is "being there" the best we can aspire to? One common approach to improving face-to-face contexts is to add new communication ...

Harry, Drew

2012-01-01

63

33 CFR 127.111 - Communications systems.  

...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...

2014-07-01

64

Animal Inspired Peripheral Interaction Evaluating a Dog-Tail Interface for Communicating Robotic States  

E-print Network

Animal Inspired Peripheral Interaction Evaluating a Dog-Tail Interface for Communicating Robotic-inspired interfaces (e.g., dog ears and tails). Zoological research tells us that dogs can convey a broad range, Canada R3T 2N2 {ashish, young}@cs.umanitoba.ca Abstract. Animals use emotions for communicating how

65

The systemic approach to the communicative silence  

Microsoft Academic Search

According to implicit theories of communication as well as to Shannon-Weaver mathematical theory, silence does not communicate. On the contrary Watzlawick holds it communicates, on the ground that every behavior communicates. Besides, according to Anolli, silence helps to communicate. The systemic perspective, relying on observer's inferential process allows to catch the emergence of the communicative value of silence in an

Maria Pietronilla Penna; Sandro Mocci

66

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

67

49 CFR 193.2519 - Communication systems.  

Code of Federal Regulations, 2012 CFR

...000 liters) storage capacity must have an emergency communication system that provides for verbal communications...operation of safety equipment in time of emergency. The emergency communication system must be independent of and...

2012-10-01

68

49 CFR 193.2519 - Communication systems.  

Code of Federal Regulations, 2011 CFR

...000 liters) storage capacity must have an emergency communication system that provides for verbal communications...operation of safety equipment in time of emergency. The emergency communication system must be independent of and...

2011-10-01

69

49 CFR 193.2519 - Communication systems.  

Code of Federal Regulations, 2013 CFR

...000 liters) storage capacity must have an emergency communication system that provides for verbal communications...operation of safety equipment in time of emergency. The emergency communication system must be independent of and...

2013-10-01

70

49 CFR 193.2519 - Communication systems.  

Code of Federal Regulations, 2010 CFR

...000 liters) storage capacity must have an emergency communication system that provides for verbal communications...operation of safety equipment in time of emergency. The emergency communication system must be independent of and...

2010-10-01

71

Three Corner Sat Communications System  

NASA Technical Reports Server (NTRS)

Three Corner Satellite is a constellation of three nanosatellites designed and built by students. New Mexico State University has taken on the design of the communications system for this constellation. The system includes the forward link, return link, and the crosslink. Due to size, mass, power, and financial constraints, we must design a small, light, power efficient, and inexpensive communications system. This thesis presents the design of a radio system to accomplish the data transmission requirements in light of the system constraints. In addition to the hardware design, the operational commands needed by the satellite's on-board computer to control and communicate with the communications hardware will be presented. In order for the hardware to communicate with the ground stations, we will examine the link budgets derived from the radiated power of the transmitters, link distance, data modulation, and data rate for each link. The antenna design for the constellation is analyzed using software and testing the physical antennas on a model satellite. After the analysis and testing, a combination of different systems will meet and exceed the requirements and constraints of the Three Corner Satellite constellation.

Anderson, Bobby; Horan, Stephen

2000-01-01

72

Advanced satellite communication system  

NASA Astrophysics Data System (ADS)

The objective of this research program was to develop an innovative advanced satellite receiver/demodulator utilizing surface acoustic wave (SAW) chirp transform processor and coherent BPSK demodulation. The algorithm of this SAW chirp Fourier transformer is of the Convolve - Multiply - Convolve (CMC) type, utilizing off-the-shelf reflective array compressor (RAC) chirp filters. This satellite receiver, if fully developed, was intended to be used as an on-board multichannel communications repeater. The Advanced Communications Receiver consists of four units: (1) CMC processor, (2) single sideband modulator, (3) demodulator, and (4) chirp waveform generator and individual channel processors. The input signal is composed of multiple user transmission frequencies operating independently from remotely located ground terminals. This signal is Fourier transformed by the CMC Processor into a unique time slot for each user frequency. The CMC processor is driven by a waveform generator through a single sideband (SSB) modulator. The output of the coherent demodulator is composed of positive and negative pulses, which are the envelopes of the chirp transform processor output. These pulses correspond to the data symbols. Following the demodulator, a logic circuit reconstructs the pulses into data, which are subsequently differentially decoded to form the transmitted data. The coherent demodulation and detection of BPSK signals derived from a CMC chirp transform processor were experimentally demonstrated and bit error rate (BER) testing was performed. To assess the feasibility of such advanced receiver, the results were compared with the theoretical analysis and plotted for an average BER as a function of signal-to-noise ratio. Another goal of this SBIR program was the development of a commercial product. The commercial product developed was an arbitrary waveform generator. The successful sales have begun with the delivery of the first arbitrary waveform generator.

Staples, Edward J.; Lie, Sen

1992-05-01

73

Advanced satellite communication system  

NASA Technical Reports Server (NTRS)

The objective of this research program was to develop an innovative advanced satellite receiver/demodulator utilizing surface acoustic wave (SAW) chirp transform processor and coherent BPSK demodulation. The algorithm of this SAW chirp Fourier transformer is of the Convolve - Multiply - Convolve (CMC) type, utilizing off-the-shelf reflective array compressor (RAC) chirp filters. This satellite receiver, if fully developed, was intended to be used as an on-board multichannel communications repeater. The Advanced Communications Receiver consists of four units: (1) CMC processor, (2) single sideband modulator, (3) demodulator, and (4) chirp waveform generator and individual channel processors. The input signal is composed of multiple user transmission frequencies operating independently from remotely located ground terminals. This signal is Fourier transformed by the CMC Processor into a unique time slot for each user frequency. The CMC processor is driven by a waveform generator through a single sideband (SSB) modulator. The output of the coherent demodulator is composed of positive and negative pulses, which are the envelopes of the chirp transform processor output. These pulses correspond to the data symbols. Following the demodulator, a logic circuit reconstructs the pulses into data, which are subsequently differentially decoded to form the transmitted data. The coherent demodulation and detection of BPSK signals derived from a CMC chirp transform processor were experimentally demonstrated and bit error rate (BER) testing was performed. To assess the feasibility of such advanced receiver, the results were compared with the theoretical analysis and plotted for an average BER as a function of signal-to-noise ratio. Another goal of this SBIR program was the development of a commercial product. The commercial product developed was an arbitrary waveform generator. The successful sales have begun with the delivery of the first arbitrary waveform generator.

Staples, Edward J.; Lie, Sen

1992-01-01

74

Degree project in Communication Systems  

E-print Network

, Sweden #12;Abstract The project focuses on the packaging process of the smart card manufacturing industryDegree project in Communication Systems Second level, 30.0 HEC Stockholm, Sweden S A A D A H M E D at an Oberthur Technologies manufacturing site. Two production lines were selected to test the system

Maguire Jr., Gerald Q.

75

Degree project in Communication Systems  

E-print Network

Degree project in Communication Systems Second level, 30.0 HEC Stockholm, Sweden S A U L I U S A L, Sweden 30 of June 2013 #12;#12;i Abstract Currently, Android is the most popular operating system of available versions, types of devices, models, form-factors and manufactures. As a result, it is virtually

Maguire Jr., Gerald Q.

76

Failure Detection in Communication Systems  

Microsoft Academic Search

Summary The purpose of this paper is to demonstrate the Sample Space Algorithm that can be used to monitor the QoS and, while monitoring, detect the occurrence of failures in wireless and wireline communication systems. The algorithm is based in the analyzes of data stored in Call Detail Records. Each time a call is made in a voice system, VoIP

Gean D. Breda; S. Mendes; Maurício L. Bottoli

77

Multipass communication systems for tiled processor architectures  

E-print Network

Multipass communication systems utilize multiple sets of parallel baseband receiver functions to balance communication data rates and available computation capabilities. This is achieved by spatially pipelining baseband ...

Shnidman, Nathan R. (Nathan Robert)

2006-01-01

78

Secure communications system  

NASA Technical Reports Server (NTRS)

System employs electronically randomized variant of quadraphase modulation and demodulation between two synchronized transceivers. System uses off-the-shelf components. It may be used with digital data, command signals, delta-modulated voice signals, digital television signals, or other data converted to digital form.

Doland, G. D.

1977-01-01

79

C. elegans ciliated sensory neurons release extracellular vesicles that function in animal communication.  

PubMed

Cells release extracellular vesicles (ECVs) that play important roles in intercellular communication and may mediate a broad range of physiological and pathological processes. Many fundamental aspects of ECV biogenesis and signaling have yet to be determined, with ECV detection being a challenge and obstacle due to the small size (100 nm) of the ECVs. We developed an in vivo system to visualize the dynamic release of GFP-labeled ECVs. We show here that specific Caenorhabdidits elegans ciliated sensory neurons shed and release ECVs containing GFP-tagged polycystins LOV-1 and PKD-2. These ECVs are also abundant in the lumen surrounding the cilium. Electron tomography and genetic analysis indicate that ECV biogenesis occurs via budding from the plasma membrane at the ciliary base and not via fusion of multivesicular bodies. Intraflagellar transport and kinesin-3 KLP-6 are required for environmental release of PKD-2::GFP-containing ECVs. ECVs isolated from wild-type animals induce male tail-chasing behavior, while ECVs isolated from klp-6 animals and lacking PKD-2::GFP do not. We conclude that environmentally released ECVs play a role in animal communication and mating-related behaviors. PMID:24530063

Wang, Juan; Silva, Malan; Haas, Leonard A; Morsci, Natalia S; Nguyen, Ken C Q; Hall, David H; Barr, Maureen M

2014-03-01

80

The ORBCOMM data communications system  

NASA Technical Reports Server (NTRS)

The ORBCOMM system is designed to provide low-cost, two-way data communications for mobile and remote users. The communications system is ideally configured for low data rate applications where communicating devices are geographically dispersed and two-way communications through terrestrial means is cumbersome and not cost effective. The remote terminals use VHF frequencies which allow for the use of very small, low-cost terminals. ORBCOMM has entered into joint development agreements with several large manufacturers of both consumer and industrial electronics to design and build the remote terminals. Based on prototype work, the estimated retail cost of these units will range from $50 to $400 depending on the complexity of the design. Starting in the fall of 1993, ORBCOMM will begin service with a demonstration network consisting of two operating satellites. By the end of 1994, a full operating network of 26 satellites, four Gateway Earth Stations, and a Network Control Center will be in place. The full constellation will provide full coverage of the entire world with greater than 94 percent communications availability for the continental U.S. This paper describes the ORBCOMM system, the technology used in its implementation, and its applications.

Schoen, David C.; Locke, Paul A.

1993-01-01

81

The ORBCOMM data communications system  

NASA Astrophysics Data System (ADS)

The ORBCOMM system is designed to provide low-cost, two-way data communications for mobile and remote users. The communications system is ideally configured for low data rate applications where communicating devices are geographically dispersed and two-way communications through terrestrial means is cumbersome and not cost effective. The remote terminals use VHF frequencies which allow for the use of very small, low-cost terminals. ORBCOMM has entered into joint development agreements with several large manufacturers of both consumer and industrial electronics to design and build the remote terminals. Based on prototype work, the estimated retail cost of these units will range from $50 to $400 depending on the complexity of the design. Starting in the fall of 1993, ORBCOMM will begin service with a demonstration network consisting of two operating satellites. By the end of 1994, a full operating network of 26 satellites, four Gateway Earth Stations, and a Network Control Center will be in place. The full constellation will provide full coverage of the entire world with greater than 94 percent communications availability for the continental U.S. This paper describes the ORBCOMM system, the technology used in its implementation, and its applications.

Schoen, David C.; Locke, Paul A.

82

Learning Communication for Multi-agent Systems  

E-print Network

agents on tasks with little environmental communication, and that more complex communication strategiesLearning Communication for Multi-agent Systems C. Lee Giles1,2 and Kam-Chuen Jim2 1 School@research.nj.nec.com Abstract. We analyze a general model of multi-agent communication in which all agents communicate

Giles, C. Lee

83

Video Communications Systems 2 LifeSize Video Communications Systems User Guide  

E-print Network

LifeSize® Video Communications Systems User Guide #12;2 LifeSize Video Communications Systems User-9301 #12;LifeSize Video Communications Systems User Guide 3 Welcome to LifeSize Video Communications Systems LifeSize high definition video communications systems enable anyone with dispersed colleagues

84

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

85

Zinc fate in animal husbandry systems.  

PubMed

Zinc (Zn) is considered in animal production systems as both an essential nutrient and a possible pollutant. While it is generally supplemented at low levels in animal diets, with less than 200 mg kg(-1) in complete feeds, it is under scrutiny due to potential accumulation in the environment. This explains why international regulations limit maximum supplementation levels in animal feeds in a stricter way. This article gives an overview of the current knowledge on the fate of zinc in animal production systems, from animal diets to animal wastes. Some analytical methods can be used for the quantification and qualification of Zn chemical forms: X-ray crystallography, electrospray tandem mass spectrometry, separation techniques, hyphenated techniques… Analysis of chelated forms issued from complex matrices, like hydrolysed proteins, remains difficult, and the speciation of Zn in diluted carriers (premix and feed) is a challenge. Our understanding of Zn absorption has made progress with recent research on ZnT/Zip families and metallothioneins. However, fine-tuned approaches towards the nutritional and metabolic interactions for Zn supplementation in farm conditions still require further studies. The speciation of zinc in pig manure and poultry litter has been a priority as monogastric animals are usually raised under intensive conditions and fed with high quantities of trace minerals, leading to high animal density and elevated quantities of zinc from animal wastes. PMID:25209575

Romeo, A; Vacchina, V; Legros, S; Doelsch, E

2014-10-22

86

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

87

Odyssey personal communications satellite system  

NASA Technical Reports Server (NTRS)

The spectacular growth of cellular telephone networks has proved the demand for personal communications. Large regions of the world are too sparsely populated to be economically served by terrestrial cellular communications. Since satellites are well suited to this application, TRW filed with the FCC on May 31, 1993 for the Odyssey construction permit. Odyssey will provide high quality wireless communication services worldwide from satellites. These services will include: voice, data, paging, and messaging. Odyssey will be an economical approach to providing communications. A constellation of 12 satellites will be orbited in three, 55 deg. inclined planes at an altitude of 10,354 km to provide continuous coverage of designated regions. Two satellites will be visible anywhere in the world at all times. This dual visibility leads to high line-of-sight elevation angles, minimizing obstructions by terrain, trees and buildings. Each satellite generates a multibeam antenna pattern that divides its coverage area into a set of contiguous cells. The communications system employs spread spectrum CDMA on both the uplinks and downlinks. This signaling method permits band sharing with other systems and applications. Signal processing is accomplished on the ground at the satellite's 'Gateway' stations. The 'bent pipe' transponders accommodates different regional standards, as well as signaling changes over time. The low power Odyssey handset will be cellular compatible. Multipath fade protection is provided in the handset.

Spitzer, Christopher J.

1993-01-01

88

Animal production systems in the industrialised world.  

PubMed

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 on food safety promotes systems with a high degree of biosecurity, often associated with an increase in herd size and self-containment. The globalisation of agricultural trade and increased competition also favours an increase in herd size and specialisation. These trends also lead to regions with livestock-dense areas, giving rise to environmental concerns. Therefore, good farming practice regulations and systems to provide a higher level of transparency, such as quality risk management programmes, are being developed. PMID:17094692

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

2006-08-01

89

Ultramicrowave communications system, phase 2  

NASA Technical Reports Server (NTRS)

Communications system design was completed and reviewed. Minor changes were made in order to make it more cost effective and to increase design flexibility. System design activities identified the techniques and procedures to generate and monitor high data rate test signals. Differential bi-phase demodulation is the proposed method for this system. The mockup and packaging designs were performed, and component layout and interconnection constraints were determined, as well as design drawings for dummy parts of the system. The possibility of adding a low cost option to the transceiver system was studied. The communications program has the advantage that new technology signal processing devices can be readily interfaced with the existing radio frequency subsystem to produce a short range radar.

1980-01-01

90

Degree project in Communication Systems  

E-print Network

Degree project in Communication Systems Second level, 30.0 HEC Stockholm, Sweden J U L I O VA R G Technology (ICT) KTH Royal Institute of Technology Stockholm, Sweden #12;Abstract Product Lifecycle. It integrates different concepts that have emerged due to changes in the manufacturing process as a result

Maguire Jr., Gerald Q.

91

Encrypted IP video communication system  

NASA Astrophysics Data System (ADS)

Digital video transmission is a permanent subject of development, research and improvement. This field of research has an exponentially growing market in civil, surveillance, security and military aplications. A lot of solutions: FPGA, ASIC, DSP have been used for this purpose. The paper presents the implementation of an encrypted, IP based, video communication system having a competitive performance/cost ratio .

Bogdan, Apetrechioaie; Lumini?a, Mateescu

2010-11-01

92

CCD filters for communication systems  

Microsoft Academic Search

CCD filters implement the concept of digital, sample-data nonrecursive filters in an analog manner using the analog delay line properties of charge-coupled semiconductor devices, thereby bringing the main features of monolithic ICs into the realm of analog filtering. The paper examines the CCD filter technology, its promises and problems, from the viewpoint of the user and designer of communication systems.

O. Mueller

1975-01-01

93

INTELLIGENCE IN MODERN COMMUNICATION SYSTEMS  

Microsoft Academic Search

Modern communication systems encompass noise sup- pression algorithms to compensate for recording and transmission errors as well as multimedia data repre- sentation modules offering both expressive and discrim- inating capabilities. Fusion of decisions derived by mono-modal detectors and features extracted separately for each data type should be supported. In addition, modern terminals should be equipped with human- cen- tered interfaces

C. Kotropoulos; I. Pitas

94

Communications satellite systems capacity analysis  

NASA Technical Reports Server (NTRS)

Analog and digital modulation techniques are compared with regard to efficient use of the geostationary orbit by communications satellites. Included is the definition of the baseline systems (both space and ground segments), determination of interference susceptibility, calculation of orbit spacing, and evaluation of relative costs. It is assumed that voice or TV is communicated at 14/11 GHz using either FM or QPSK modulation. Both the Fixed-Satellite Service and the Broadcasting-Satellite Service are considered. For most of the cases examined the digital approach requires a satellite spacing less than or equal to that required by the analog approach.

Browne, L.; Hines, T.; Tunstall, B.

1982-01-01

95

A conceptual model for particle systems animation  

E-print Network

Particle systems represent a technique for creating a special class of computer generated images. This class of imagery would be difficult or impossible to create using traditional surface based representations found in current computer animation...

Flaherty, Eric Wayne

2012-06-07

96

A Knowledge-Based Computer Animation System  

E-print Network

This paper reproduces part of a doctoral thesis proposal describing the design of a system capable of generating animated drawings in response to a simple story. The representation and interaction of the various sources ...

Kahn, Kenneth M.

97

The HTV Proximity Communication System  

NASA Astrophysics Data System (ADS)

National Space Development Agency of Japan (NASDA) is developing the H-II Transfer Vehicle (HTV) as an unmanned logistic support vehicle for the International Space Station (ISS). The HTV, which is launched by the H-IIA rocket, transports both pressurized and un-pressurized cargoes to the ISS, reloads disposal items from the ISS and performs destructive reentry over ocean area. NASDA plans the first flight of HTV in 2005 for demonstration. The HTV will contribute the ISS assembly and logistic re-supply operations with international commonality. For unmanned vehicle operation, communication link is critical with commanding and control, especially in proximity region to the ISS. As for the HTV operation, NASDA is developing dedicated communication system installed on the Japanese Experiment Module (JEM) of the ISS, which is called the Proximity Communication System (PROX). The HTV receives commands and transmits telemetry data through the PROX in its proximity operation to the ISS. To achieve this, the PROX can communicate with the HTV on its nominal trajectory within 23km of the ISS. Especially within 3km of the ISS, the PROX has capability to perform omni-directional communication to the HTV. The PROX also has GPS receiver and send GPS data to the HTV to support the HTV navigation for relative GPS navigation used in "far" range (500m away from the ISS). In addition to the above fundamental functions, the PROX has a capability of range and range-rate measurement between the ISS and the HTV by the pseudo noise (PN) code epoch and the Doppler shift frequency. This provides a reference data independent of "main" navigation methods (rendezvous sensor navigation or GPS navigation) of the HTV. The PROX also assists the ISS crew with its commanding device, called the Hardware Command Panel (HCP), to issue time-dependent safety-related critical commands for HTV berthing/un-berthing operation. When a failure occurs somewhere on "communication path" from the PROX Base Band Processor (BBP) to the HTV Guidance and Control Computer (GCC) including data handling and communication equipments, the PROX detects it by monitoring interruption of the "heartbeat" signal and conducts automatic redundancy switching of all the equipments on that "communication path" including those of the HTV. This paper describes the PROX functions such as communication, data handling and GPS navigation and some unique functions for the HTV proximity operation to the ISS.

Harada, Motoyuki; Takahashi, Tetsuo; Tanaka, Tetsuo

2002-01-01

98

Animations for communicating the science of underwater sound.  

PubMed

For several years, the author has been developing a popular website (http://www.acs.psu.edu/drussell/demos.html) consisting of a variety of computer animations illustrating acoustic phenomena involving wave propagation and vibration [Russell, J. Acoust. Soc. Am., 114, 2308 (2003)]. This paper will showcase a subset of those animations, including several new animations of acoustic wave phenomena and interactive plots created using the Wolfram Mathematica Computable Document Format, which are specifically geared toward enhancing student understanding of the propagation and radiation of sound underwater. Animation examples will include wave propagation; sound radiation from simple sources; directivity patterns for dipoles, doublets, line arrays, and the baffled piston; refraction and reflection; absorption of sound; and waveguides. PMID:25236018

Russell, Daniel A

2014-04-01

99

Acoustical Communications for Wireless Downhole Telemetry Systems  

E-print Network

This dissertation investigates the use of advanced acoustical communication techniques for wireless downhole telemetry systems. Using acoustic waves for downhole telemetry systems is investigated in order to replace the wired communication systems...

Farraj, Abdallah

2012-08-22

100

Cell-to-cell communication in plants, animals, and fungi: a comparative review  

NASA Astrophysics Data System (ADS)

Cell-to-cell communication is a prerequisite for differentiation and development in multicellular organisms. This communication has to be tightly regulated to ensure that cellular components such as organelles, macromolecules, hormones, or viruses leave the cell in a precisely organized way. During evolution, plants, animals, and fungi have developed similar ways of responding to this biological challenge. For example, in higher plants, plasmodesmata connect adjacent cells and allow communication to regulate differentiation and development. In animals, two main general structures that enable short- and long-range intercellular communication are known, namely gap junctions and tunneling nanotubes, respectively. Finally, filamentous fungi have also developed specialized structures called septal pores that allow intercellular communication via cytoplasmic flow. This review summarizes the underlying mechanisms for intercellular communication in these three eukaryotic groups and discusses its consequences for the regulation of differentiation and developmental processes.

Bloemendal, Sandra; Kück, Ulrich

2013-01-01

101

The central importance of information in studies of animal communication Robert M. Seyfarth a,*, Dorothy L. Cheney b  

E-print Network

The Association for the Study of Animal Behaviour. Published by Elsevier Ltd. All rights reserved. The conceptEssay The central importance of information in studies of animal communication Robert M. Seyfarth a Available online 21 May 2010 MS. number: AE-09-00802 Keywords: animal communication animal signal

102

Low Altitude Space Communication System  

NASA Astrophysics Data System (ADS)

We describe a new Low Altitude Space Communication System (LASCOS), which was completed in 1996 by the Institute of Space and Astronautical Science in Japan. This system consists of a mobile balloon tracking and receiving station and networks which connect them to the Sanriku Balloon Center in Iwate Municipality and the Institute of Space and Astronautical Science (ISAS) in Kanagawa Municipality. This station and the SBC receiving station are connected via telephone lines, i. e. an Integrated Services Digital Network (ISDN) or an analog communication network. Balloon trajectory monitoring, telecommand transmission operation and telemetry data acquisition can be done from any computer terminal through the LASCOS. LASCOS has built-in flexibility to adapt to a foreign balloon station. The number of individuals necessary to operate it minimum. LASCOS will be used for long range tracking and balloon expedition. We present the results of its first test with an actual balloon flight

Namiki, Michiyoshi; Matsuzaka, Yukihiko; Honda, Hideyuki; Toriumi, Michihiko; Kamioka, Eiji; Saito, Yoshitaka; Izutsu, Naoki; Ohta, Sigeo; Yamagami, Takamasa; Yajima, Nobuyuki; Hirosawa, Haruto; Ohya, Nobuhiko; Takezawa, Fukashi; Yamaguchi, Kenji

103

Short-range communication system  

NASA Technical Reports Server (NTRS)

A short-range communication system includes an antenna, a transmitter, and a receiver. The antenna is an electrical conductor formed as a planar coil with rings thereof being uniformly spaced. The transmitter is spaced apart from the plane of the coil by a gap. An amplitude-modulated and asynchronous signal indicative of a data stream of known peak amplitude is transmitted into the gap. The receiver detects the coil's resonance and decodes same to recover the data stream.

Alhorn, Dean C. (Inventor); Howard, David E. (Inventor); Smith, Dennis A. (Inventor)

2012-01-01

104

Trends in Automotive Communication Systems  

Microsoft Academic Search

The use of networks for communications between the electronic control units (ECU) of a vehicle in production cars dates from the beginning of the 1990s. The specific requirements of the different car domains have led to the development of a large number of automotive networks such as Local Interconnect Network, J1850, CAN, TTP\\/C, FlexRay, media-oriented system transport, IDB1394, etc. This

NICOLAS NAVET; YEQIONG SONG; FRANÇOISE SIMONOT-LION; CÉDRIC WILWERT

2005-01-01

105

46 CFR 130.440 - Communications system.  

Code of Federal Regulations, 2010 CFR

...DEPARTMENT OF HOMELAND SECURITY (CONTINUED) OFFSHORE SUPPLY VESSELS VESSEL CONTROL, AND MISCELLANEOUS EQUIPMENT AND SYSTEMS Automation of Unattended Machinery Spaces § 130.440 Communications system. (a) Each OSV must have a communications...

2010-10-01

106

46 CFR 130.440 - Communications system.  

Code of Federal Regulations, 2011 CFR

...DEPARTMENT OF HOMELAND SECURITY (CONTINUED) OFFSHORE SUPPLY VESSELS VESSEL CONTROL, AND MISCELLANEOUS EQUIPMENT AND SYSTEMS Automation of Unattended Machinery Spaces § 130.440 Communications system. (a) Each OSV must have a communications...

2011-10-01

107

46 CFR 130.440 - Communications system.  

Code of Federal Regulations, 2012 CFR

...DEPARTMENT OF HOMELAND SECURITY (CONTINUED) OFFSHORE SUPPLY VESSELS VESSEL CONTROL, AND MISCELLANEOUS EQUIPMENT AND SYSTEMS Automation of Unattended Machinery Spaces § 130.440 Communications system. (a) Each OSV must have a communications...

2012-10-01

108

46 CFR 130.440 - Communications system.  

Code of Federal Regulations, 2013 CFR

...DEPARTMENT OF HOMELAND SECURITY (CONTINUED) OFFSHORE SUPPLY VESSELS VESSEL CONTROL, AND MISCELLANEOUS EQUIPMENT AND SYSTEMS Automation of Unattended Machinery Spaces § 130.440 Communications system. (a) Each OSV must have a communications...

2013-10-01

109

Complexity in Animal Communication: Estimating the Size of N-Gram Structures  

NASA Astrophysics Data System (ADS)

In this paper, new techniques that allow conditional entropy to estimate the combinatorics of symbols are applied to animal communication studies to estimate the communication's repertoire size. By using the conditional entropy estimates at multiple orders, the paper estimates the total repertoire sizes for animal communication across bottlenose dolphins, humpback whales, and several species of birds for N-grams length one to three. In addition to discussing the impact of this method on studies of animal communication complexity, the reliability of these estimates is compared to other methods through simulation. While entropy does undercount the total repertoire size due to rare N-grams, it gives a more accurate picture of the most frequently used repertoire than just repertoire size alone.

Smith, Reginald

2014-01-01

110

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

111

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

112

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.

113

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

114

Communication System Architecture for Planetary Exploration  

NASA Technical Reports Server (NTRS)

Future human missions to Mars will require effective communications supporting exploration activities and scientific field data collection. Constraints on cost, size, weight and power consumption for all communications equipment make optimization of these systems very important. These information and communication systems connect people and systems together into coherent teams performing the difficult and hazardous tasks inherent in planetary exploration. The communication network supporting vehicle telemetry data, mission operations, and scientific collaboration must have excellent reliability, and flexibility.

Braham, Stephen P.; Alena, Richard; Gilbaugh, Bruce; Glass, Brian; Norvig, Peter (Technical Monitor)

2001-01-01

115

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

116

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 ha...

117

American Sign Language & Heterogeneous Communication Systems.  

ERIC Educational Resources Information Center

This study seeks to understand American Sign Language (ASL) as heterogeneous communication and to use it as a model for developing in other modalities alternative heterogeneous communication systems with the same advantages. (26 references) (CK)

Macken, Elizabeth; And Others

1995-01-01

118

33 CFR 127.1111 - Communication systems.  

Code of Federal Regulations, 2013 CFR

(a) The marine transfer area for LHG must possess a communication system that enables continuous two way voice communication between the person in charge of transfer aboard the vessel and the person in charge of transfer for the...

2013-07-01

119

Complex biological memory conceptualized as an abstract communication system -human  

E-print Network

's evolutionary history; and in the second place by the selective pressure of the organism's continued experience1 Complex biological memory conceptualized as an abstract communication system -human long term, Newcastle upon TYne, NE1 7RU, UK 1.1 Summary Biological memory in humans and other animals with a central

Newcastle upon Tyne, University of

120

SHORT COMMUNICATION An audio/video surveillance system for wildlife  

E-print Network

widely used to document the presence and behaviour of animals at nests, trap sites and wildlife passagesSHORT COMMUNICATION An audio/video surveillance system for wildlife Roman Gula & Jörn Theuerkauf frequently visited by wildlife. Keywords Methods . Video surveillance . Nest monitoring . Digital video

Paris-Sud XI, Université de

121

Ris Energy Report 4 System control and communication 4 9 System control and communication  

E-print Network

Risø Energy Report 4 System control and communication 4 9 System control and communication HENRIK b rooms. Robustness in communication and information systems is very important and decen- tralised control and balance markets. To operate successfully, all these markets require a good communication infrastructure

122

Advances in Small Animal Imaging Systems  

NASA Astrophysics Data System (ADS)

The rapid growth in genetics and molecular biology combined with the development of techniques for genetically engineering small animals has led to an increased interest in in vivo laboratory animal imaging during the past few years. For this purpose, new instrumentation, data acquisition strategies, and image processing and reconstruction techniques are being developed, researched and evaluated. The aim of this article is to give a short overview of the state of the art technologies for high resolution and high sensitivity molecular imaging techniques, primarily positron emission tomography (PET) and single photon emission computed tomography (SPECT). The basic needs of small animal imaging will be described. The evolution in instrumentation in the past two decades, as well as the commercially available systems will be overviewed. Finally, the new trends in detector technology and preliminary results from challenging applications will be presented. For more details a number of references are provided.

Loudos, George K.

2007-11-01

123

A Reconfigurable Communications System for Small Spacecraft  

NASA Technical Reports Server (NTRS)

Two trends of NASA missions are the use of multiple small spacecraft and the development of an integrated space network. To achieve these goals, a robust and agile communications system is needed. Advancements in field programmable gate array (FPGA) technology have made it possible to incorporate major communication and network functionalities in FPGA chips; thus this technology has great potential as the basis for a reconfigurable communications system. This report discusses the requirements of future space communications, reviews relevant issues, and proposes a methodology to design and construct a reconfigurable communications system for small scientific spacecraft.

Chu, Pong P.; Kifle, Muli

2004-01-01

124

47 CFR 90.465 - Control of systems of communication.  

Code of Federal Regulations, 2011 CFR

... false Control of systems of communication. 90.465 Section 90.465 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) SAFETY...465 Control of systems of communication. (a) Depending on...

2011-10-01

125

47 CFR 90.465 - Control of systems of communication.  

Code of Federal Regulations, 2010 CFR

... false Control of systems of communication. 90.465 Section 90.465 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) SAFETY...465 Control of systems of communication. (a) Depending on...

2010-10-01

126

47 CFR 90.465 - Control of systems of communication.  

Code of Federal Regulations, 2013 CFR

... false Control of systems of communication. 90.465 Section 90.465 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) SAFETY...465 Control of systems of communication. (a) Depending on...

2013-10-01

127

Spacecraft Multiple Array Communication System Performance Analysis  

NASA Technical Reports Server (NTRS)

The Communication Systems Simulation Laboratory (CSSL) at the NASA Johnson Space Center is tasked to perform spacecraft and ground network communication system simulations, design validation, and performance verification. The CSSL has developed simulation tools that model spacecraft communication systems and the space and ground environment in which the tools operate. In this paper, a spacecraft communication system with multiple arrays is simulated. Multiple array combined technique is used to increase the radio frequency coverage and data rate performance. The technique is to achieve phase coherence among the phased arrays to combine the signals at the targeting receiver constructively. There are many technical challenges in spacecraft integration with a high transmit power communication system. The array combining technique can improve the communication system data rate and coverage performances without increasing the system transmit power requirements. Example simulation results indicate significant performance improvement can be achieved with phase coherence implementation.

Hwu, Shian U.; Desilva, Kanishka; Sham, Catherine C.

2010-01-01

128

Human-robot mutual communication system  

Microsoft Academic Search

The paper explores a human-robot mutual communication system, which human users can either communicate with or use as an information terminal. In particular, we propose a robotic vision system, which changes its visual attention according to the environment. We also propose a deformation based facial expression system. Firstly, the system must have advanced abilities to express its intention by making

Toshio Fukuda; Daisuke Tachibana; Fumihito Arai; Jun Taguri; Masakazu Nakashima; Yasuhisa Hasegawa

2001-01-01

129

Smart Grid Communications System Blueprint  

NASA Astrophysics Data System (ADS)

Telecommunications operators are well versed in deploying 2G and 3G wireless networks. These networks presently support the mobile business user and/or retail consumer wishing to place conventional voice calls and data connections. The electrical power industry has recently commenced transformation of its distribution networks by deploying smart monitoring and control devices throughout their networks. This evolution of the network into a `smart grid' has also motivated the need to deploy wireless technologies that bridge the communication gap between the smart devices and information technology systems. The requirements of these networks differ from traditional wireless networks that communications operators have deployed, which have thus far forced energy companies to consider deploying their own wireless networks. We present our experience in deploying wireless networks to support the smart grid and highlight the key properties of these networks. These characteristics include application awareness, support for large numbers of simultaneous cell connections, high service coverage and prioritized routing of data. We also outline our target blueprint architecture that may be useful to the industry in building wireless and fixed networks to support the smart grid. By observing our experiences, telecommunications operators and equipment manufacturers will be able to augment their current networks and products in a way that accommodates the needs of the emerging industry of smart grids and intelligent electrical networks.

Clark, Adrian; Pavlovski, Chris

2010-10-01

130

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

131

Degree project in Communication Systems  

E-print Network

to enhance internal communication within and across a large enterprise KTH Information and Communication and across a large enterprise Improving a Corporate Social Network Jesus Paredes Sanz 2013.04.08 School technologies' communication power has begun to be leveraged by enterprises in order to gain competitive

Maguire Jr., Gerald Q.

132

Software-defined Quantum Communication Systems  

SciTech Connect

We show how to extend the paradigm of software-defined communication to include quantum communication systems. We introduce the decomposition of a quantum communication terminal into layers separating the concerns of the hardware, software, and middleware. We provide detailed descriptions of how each component operates and we include results of an implementation of the super-dense coding protocol. We argue that the versatility of software-defined quantum communication test beds can be useful for exploring new regimes in communication and rapidly prototyping new systems.

Humble, Travis S [ORNL] [ORNL; Sadlier, Ronald J [ORNL] [ORNL

2013-01-01

133

Parallel Communicating Grammar Systems with Regular Control  

NASA Astrophysics Data System (ADS)

Parallel communicating grammar systems with regular control (RPCGS, for short) are introduced, which are obtained from returning regular parallel communicating grammar systems by restricting the derivations that are executed in parallel by the various components through a regular control language. For the class of languages that are generated by RPCGSs with constant communication complexity we derive a characterization in terms of a restricted type of freely rewriting restarting automaton. From this characterization we obtain that these languages are semi-linear, and that centralized RPCGSs with constant communication complexity are of the same generative power as non-centralized RPCGSs with constant communication complexity.

Pardubská, Dana; Plátek, Martin; Otto, Friedrich

134

Animal-Inspired Human-Robot Interaction: A Robotic Tail for Communicating State  

E-print Network

@cs.umanitoba.ca ABSTRACT We present a robotic tail interface for enabling a robot to communicate its state to people. Our, leveraging people's existing knowledge of and experiences with animals for human-robot interaction are designed and built as utility robots to help people in their homes and workplaces. Some argue

135

Animal Communication: What Makes a Dog Able to Understand its Master?  

E-print Network

Animal Communication: What Makes a Dog Able to Understand its Master? Richard W. Byrne The dog has, chimpanzees still seems to find it difficult to follow the hint. Yet domestic dogs learn this task easily, even those not from breeds specifically bred as `pointers'. Dogs are able to follow pointing by head

136

A review of mobile satellite communication systems  

NASA Astrophysics Data System (ADS)

This article describes mobile satellite systems in the planning or development stage such as MSAT, AMSC and Geostar and mobile satellite communication experiments such as PRODAT. Studies on the system such as T-SAT are also reviewed. In addition, Japanese ETS-V and ETS-VI are described. The development of mobile-satellite communication systems is promoted along with those of communication and satellite technologies.

Kondo, Kimio

1990-03-01

137

Software-defined Quantum Communication Systems  

E-print Network

Quantum communication systems harness modern physics through state-of-the-art optical engineering to provide revolutionary capabilities. An important concern for quantum communication engineering is designing and prototyping these systems to evaluate proposed capabilities. We apply the paradigm of software-defined communication for engineering quantum communication systems to facilitate rapid prototyping and prototype comparisons. We detail how to decompose quantum communication terminals into functional layers defining hardware, software, and middleware concerns, and we describe how each layer behaves. Using the super-dense coding protocol as an example, we describe implementations of both the transmitter and receiver, and we present results from numerical simulations of the behavior. We conclude that software-defined quantum communication provides a robust framework in which to explore the large design space offered by this new regime of communication.

Travis S. Humble; Ronald J. Sadlier

2014-03-13

138

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

139

COMMANIMATION : a speech-controlled animation system  

E-print Network

In order to make the task of animation creation easy, a different approach should be presented to the user. This thesis describes a new approach to animation creation. In this approach, the representation of animation is ...

Kho, Nancy Ellen, 1981-

2004-01-01

140

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

141

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

E-print Network

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

142

Output Synchronization of Multi-Agent Systems with Event-Driven Communication: Communication Delay and  

E-print Network

synchronization, event-driven communication, quantization effects, communication delay, passivity, graph theoryOutput Synchronization of Multi-Agent Systems with Event-Driven Communication: Communication Delay-Agent Systems with Event-Driven Communication: Communication Delay and Signal Quantization Han Yu, Student

Antsaklis, Panos

143

Sign Language: A Communication System.  

ERIC Educational Resources Information Center

The manual is intended as a course resource to help hearing secondary students learn to communicate with deaf peers or family members. The total communication approach is described and reasons for its use advanced. An introductory section explains the philosophy, general goals, and program objectives of the course. Ten lesson plans are then…

New York State Education Dept., Albany. Bureau of Curriculum Development.

144

Augmentative Communication: Assessment, System Selection, and Usage.  

ERIC Educational Resources Information Center

Augmentative communication systems for the nonspeaking brain-injured should be carefully selected to serve a variety of functions. These include the utilization of systems for communication purposes, assessment of cognitive-linguistic deficits, integration and participation by the individual in the rehabilitation program, and improvement in an…

DeRuyter, Frank; Becker, Mary R.

1988-01-01

145

System Design for Cognitive Radio Communications  

E-print Network

System Design for Cognitive Radio Communications Mustafa E. S¸ahin and H¨useyin Arslan Electrical about an increasing demand for frequency spectrum. Cognitive radio offers a tempting solution radio communications. In this paper, a comprehensive system design for cognitive radio is presented

Arslan, Hüseyin

146

Microbes and animal olfactory communication: Where do we go from here?  

PubMed

We know that microbes contribute to the production of odors that some animals use to communicate, but how common is this phenomenon? Recent studies capitalizing on new molecular technologies are uncovering fascinating associations between microbes and odors of wild animals, but causality is difficult to ascertain. Fundamental questions about the nature of these unique host-microbe interactions also remain unanswered. For instance, do microbes benefit from signaling associations with hosts? How does microbial community structure influence signal production? How do hosts regulate microbes in order to generate appropriate signals? Here, we review the current state of knowledge on microbially produced signals in animals and discuss key research foci that can advance our understanding of microbial-based signaling in the animal world. PMID:24986361

Ezenwa, Vanessa O; Williams, Allison E

2014-09-01

147

Roadside-based communication system and method  

NASA Technical Reports Server (NTRS)

A roadside-based communication system providing backup communication between emergency mobile units and emergency command centers. In the event of failure of a primary communication, the mobile units transmit wireless messages to nearby roadside controllers that may take the form of intersection controllers. The intersection controllers receive the wireless messages, convert the messages into standard digital streams, and transmit the digital streams along a citywide network to a destination intersection or command center.

Bachelder, Aaron D. (Inventor)

2007-01-01

148

Animal biocalorimeter and waste management system  

NASA Technical Reports Server (NTRS)

A biocalorimeter and waste management system is provided for making metabolic heat release measurements of animals or humans in a calorimeter (enclosure) using ambient air as a low velocity source of ventilating air through the enclosure. A shroud forces ventilating air to pass over the enclosure from an end open to ambient air at the end of the enclosure opposite its ventilating air inlet end and closed around the inlet end of the enclosure in order to obviate the need for regulating ambient air temperature. Psychrometers for measuring dry- and wet-bulb temperature of ventilating air make it possible to account for the sensible and latent heat additions to the ventilating air. A waste removal system momentarily recirculates high velocity air in a closed circuit through the calorimeter wherein a sudden rise in moisture is detected in the ventilating air from the outlet.

Poppendiek, Heinz F. (Inventor); Trimailo, William R. (Inventor)

1995-01-01

149

Animal Care and Biosafety The present SOP has been adapted from McGill Crisis Management and Communication Plan 1  

E-print Network

Animal Care and Biosafety Committee The present SOP has been adapted from McGill Crisis Management and Communication Plan 1 BUACBC-SOP-6: SPECIFIC RESPONSE PLAN FOR ANIMAL USE Crisis Management (SRPA) must always be available in spaces where animals are used. An emergency is defined as any

150

SRS Computer Animation and Drive Train System  

NASA Technical Reports Server (NTRS)

The spinning rocket simulator (SRS) is an ongoing project at Oral Roberts University. The goal of the SRS is to gather crucial data concerning a spinning rocket under thrust for the purpose of analysis and correction of the coning motion experienced by this type of spacecraft maneuver. The computer animation simulates a virtual, scale model of the component of the SRS that represents the spacecraft itself. This component is known as the (VSM), or virtual spacecraft model. During actual physical simulation, this component of the SRS will experience a coning. The goal of the animation is to cone the VSM within that range to accurately represent the motion of the actual simulator. The drive system of the SRS is the apparatus that turns the actual simulator. It consists of a drive motor, motor mount and chain to power the simulator into motion. The motor mount is adjustable and rigid for high torque application. A digital stepper motor controller actuates the main drive motor for linear acceleration. The chain transfers power from the motor to the simulator via sprockets on both ends.

Arthun, Daniel; Schachner, Christian

2001-01-01

151

Energy-aware portable video communication system design for wildlife activity monitoring  

Microsoft Academic Search

In this paper, we introduce our recent research and development effort on energy-efficient portable video communication system design for wildlife activity monitoring. The capability of seeing what an animal sees in the field is very important for wildlife activity monitoring and research. We design an integrated video and sensor system, called DeerCam and mount it on animals so as to

Zhihai He; Jay Eggert; Wenye Cheng; Xiwen Zhao; Joshua Millspaugh; Remington Moll; Jeff Beringer; Joel Sartwell

2008-01-01

152

Modeling Multimodal Communication as a Complex System  

E-print Network

of their interactions. Embodied natural communication belongs to this class of systems, encompassing many cognitive mechanisms that interact in highly complex ways, both within and between communicating individuals in certain ways and not others by certain drugs such as alcohol. A basic theory of human dialogue presupposes

Thórisson, Kristinn Rúnar

153

How to Bootstrap a Human Communication System  

ERIC Educational Resources Information Center

How might a human communication system be bootstrapped in the absence of conventional language? We argue that motivated signs play an important role (i.e., signs that are linked to meaning by structural resemblance or by natural association). An experimental study is then reported in which participants try to communicate a range of pre-specified…

Fay, Nicolas; Arbib, Michael; Garrod, Simon

2013-01-01

154

Integrating Two Organizational Systems Through Communication Genres  

E-print Network

Integrating Two Organizational Systems Through Communication Genres Carlos J. Costa1, Pedro Antunes-to-one communication. Our main scenario is a meeting room where people meet face-to-face, use any desktop computers. This paper describes the integration of two different types of support to the coordination of organizational

Antunes, Pedro

155

Simulating Rain Fade In A Communication System  

NASA Technical Reports Server (NTRS)

Automated, computer-controlled assembly of electronic equipment developed for use in simulation testing of downlink portion of Earth/satellite microwave digital communication system. Designed to show effects upon performance of system of rain-induced fading in received signal and increases in transmitted power meant to compensate for rain-induced fading. Design of communication system improved iteratively in response to results of simulations, leading eventually to design ensuring clear, uninterrupted transmission of digital signals.

Shalkhauser, Kurt A.; Nagy, Lawrence A.; Svoboda, James K.

1994-01-01

156

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

157

Degree project in Communication Systems  

E-print Network

and reliability. Today there is a practical need for quantitative analysis regarding the socio-economic impacts Socio-economic Impact of Fiber to the Home in Sweden KTH Information and Communication Technology #12;S of fiber-based access networks. This analysis could be used as an indicator/reference for all

Maguire Jr., Gerald Q.

158

Communication Systems at Millimeter Waves  

Microsoft Academic Search

The technical advantages of mm-waves for short range and high data rate radio communications are well known: The availability of bandwidth, the robustness against interception and jamming, and the possibility of repeated frequence reuse after considerably small distances given by a high basic path attenuation and by certain propagation limits of atmosphere. Otherwise some unsolved problems are existing, which hinder

B. Rembold

1992-01-01

159

21 CFR 892.2050 - Picture archiving and communications system.  

Code of Federal Regulations, 2010 CFR

...archiving and communications system. 892.2050 Section 892...archiving and communications system. (a) Identification...archiving and communications system is a device that provides...Std., Joint Photographic Experts Group (JPEG) Std.,...

2010-04-01

160

Tags, wireless communication systems, tag communication methods, and wireless communications methods  

DOEpatents

Tags, wireless communication systems, tag communication methods, and wireless communications methods are described. In one aspect, a tag includes a plurality of antennas configured to receive a plurality of first wireless communication signals comprising data from a reader, a plurality of rectifying circuits coupled with. respective individual ones of the antennas and configured to provide rectified signals corresponding to the first wireless communication signals, wherein the rectified signals are combined to produce a composite signal, an adaptive reference circuit configured to vary a reference signal responsive to the composite signal, a comparator coupled with the adaptive reference circuit and the rectifying circuits and configured to compare the composite signal with respect to the reference signal and to output the data responsive to the comparison, and processing circuitry configured to receive the data from the comparator and to process the data.

Scott; Jeff W. (Pasco, WA), Pratt; Richard M. (Richland, WA)

2006-09-12

161

TANGO: A FRAMEWORK AND SYSTEM FOR ALGORITHM ANIMATION  

Microsoft Academic Search

Algorithm animation is the process of abstracting the data, operations, and semantics of computer programs, and then creating animated graphical views of those abstractions. Although a handful of algorithm animation systems have been developed in recent years, relatively little work has been done on the theoretical foundations of such systems. In this work we develop a conceptual framework with formal

John T. Stasko

1990-01-01

162

Degree project in Communication Systems  

E-print Network

K U R I Y O a n d M O H A M M A D A B D U L L A Toward a Network Based 3D Printing Service KTH Information and Communication Technology #12;Toward a Network Based3D Printing Service Laurier Ndikuriyo realized and is left as future work. Keywords: 3D-printing, MakerBot Thing-o-Matic, Replicatorg, LAMP, Open

Maguire Jr., Gerald Q.

163

Considering Hierarchical Hybrid Systems for Intelligent Animated Agents  

Microsoft Academic Search

\\u000a We consider potential benefits of representing intelligent animated agents as hierarchical hybrid dynamical systems (i.e., systems with both continuous and discrete dynamics). We begin by directly applying hybrid systems theory to animation,\\u000a using a general-purpose hybrid system specification tool to generate multi-agent animations. This application illustrates\\u000a that a hybrid system architecture can provide a systematic, modular way to incorporate low-level

Eric Aaron; Dimitris N. Metaxas

2002-01-01

164

Software-defined Quantum Communication Systems  

SciTech Connect

Quantum communication systems harness modern physics through state-of-the-art optical engineering to provide revolutionary capabilities. An important concern for quantum communication engineering is designing and prototyping these systems to prototype proposed capabilities. We apply the paradigm of software-defined communica- tion for engineering quantum communication systems to facilitate rapid prototyping and prototype comparisons. We detail how to decompose quantum communication terminals into functional layers defining hardware, software, and middleware concerns, and we describe how each layer behaves. Using the super-dense coding protocol as a test case, we describe implementations of both the transmitter and receiver, and we present results from numerical simulations of the behavior. We find that while the theoretical benefits of super dense coding are maintained, there is a classical overhead associated with the full implementation.

Humble, Travis S [ORNL; Sadlier, Ronald J [ORNL

2014-01-01

165

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. PMID:21777495

2011-01-01

166

Intelligent Network Communications for Distributed Database Systems  

Microsoft Academic Search

Customizing network sites have become an increasingly important issue in distributed database systems. This will improve the network system performance by reducing the number of communications required for query processing in terms of retrieval and update transactions. This paper presents an intelligent clustering method for distributed database system that provides a structure for organizing large number of network sites into

Ismail Omar Hababeh

2010-01-01

167

Tactical Automated Security System (TASS) RF communications  

SciTech Connect

The Tactical Automated Security System (TASS) spearheads a new way of performing security for the US Air Force: a portable, relocatable security system that deploys and moves with the troops. TASS applications will range from temporary assets located in remote areas to performing traditional, semipermanent roles on main operating bases. In addition, the system is designed for tactical and covert applications. The main elements of TASS include tactical and relocatable sensors, thermal imagers and assessment devices, data communications, alarm annunciation and power. A primary requirement for the TASS system is to utilize wireless communications links to the maximum extent possible. Current wireless technology best supports TASS with radio frequency (RF) based links, but other techniques may eventually be used. This paper addresses the TASS data communications requirements, actions taken to fulfill these requirements, and continuing challenges to operating in the RF mode.

Thurber, J. [AVJG, Hanscom AFB, MA (United States). Electronic Systems Center; Dumais, B. [Horizons Technology, Inc., Billerica, MA (United States); Kenyon, D. [Analytical Systems Engineering Corp., Bedford, MA (United States); Harrington, J. [Sandia National Labs., Albuquerque, NM (United States)

1993-12-31

168

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

169

Communication Theory of Secrecy Systems?  

Microsoft Academic Search

detailed study is made of the many standard types of codes and ciphers, and of the ways of breaking them. We will be more concerned with the general mathematical structure and properties of secrecy systems. The treatment is limited in certain ways. First, there are three general types of secrecy system: (1) concealment systems, including such methods as invisible ink,

C. E. SHANNON

170

Optic communication and sensor systems  

Microsoft Academic Search

Development of an optic serial data system along with a set of passive optic sensor systems that are suitable for use in turbine engine controls will be discussed. Component development covered includes electro-optic interfaces, custom digital GaAs IC circuit design and custom silicon IC design. The passive optic sensor systems include wavelength division multiplexed displacement sensors, short coherence length interferometric

E. M. Arnett; S. M. Emo; T. R. Kinney

1988-01-01

171

Differential phase shift keyed communication system  

NASA Technical Reports Server (NTRS)

A communication system using differential phase-shift-keying (DPSK) transmits and receives binary data without requiring timing or phase reference signals. The system encodes and modulates the data at the transmitter, and decodes and demodulates the data at the receiver, without ambiguity as to the data content.

Hopkins, P. M.; Wallingford, W. M. (inventors)

1974-01-01

172

School Planning, Evaluation and Communication System (SPECS).  

ERIC Educational Resources Information Center

A comprehensive school planning tool is available from General Learning Corporation and the Center for the Advanced Study of Educational Administration at the University of Oregon. This School Planning, Evaluation and Communication System (SPECS) provides a deliverable system of training, implementation strategies and materials and technical…

Flocco, Edward C.

173

Checking of communications and radio navigation systems  

Microsoft Academic Search

The testing of aircraft communications and radio navigation systems is addressed. Limited assessments need to take account of variations in ground station performance, and uncertainty regarding radio wave propagation conditions. Antenna performance can vary markedly in different aircraft to affect the radial coverage of all systems, or the accuracy achieved by direction finding equipment. Aircraft transmitting antenna characteristics can be

H. Maidment

1980-01-01

174

Towards an interactive high visual complexity animation system  

Microsoft Academic Search

A computer animation system is discussed which employs interactive techniques and presents a unified approach to the graphical display of complex three dimensional data. The system facilitates the generation, manipulation and display of highly detailed data with the aid of interactive devices and a video interface to a standard color TV monitor. The system enables the animator to create a

C. Csuri; R. Hackathorn; R. Parent; W. Carlson; M. Howard

1979-01-01

175

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

176

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

177

Shuttle communication systems compatibility and performance testing  

NASA Technical Reports Server (NTRS)

The Shuttle communications system consists of major space and ground elements. The compatibility and performance of each of these major elements functioning as a complete system must be certified prior to operational missions. This paper discusses the Shuttle communication systems compatibility and performance testing. The system test philosophy for the complex communication channels is described in terms of the major phases, which include early breadboard system design evaluation tests, system development tests with prototype hardware, and system certification testing with qualifiable (flight) hardware. The system hardware configuration, facility requirements, test and evaluation techniques, and operational approaches required to accomplish each major phase of testing are reviewed. Results of recently completed space-to-space and space-to-ground system tests are presented. Test techniques and measurement accuracies proven over ten years of unique system-evaluation experience are reviewed. Techniques used in relating experimental and predicted system performance, and conclusions regarding the effectiveness of system level testing of such complex hardware, are addressed.

Seyl, J. W.; Travis, A. D.

1977-01-01

178

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

179

Wireless Communications Systems, I Cellular Telephone System  

E-print Network

.g., push-to-talk citizen radio, walkie-talkies) ­ Full-duplex (simultaneous two way transmission due to interference FM push-to-talk telephone: 120kHz of RF BW is needed for one channel (1950: 60k (Data services added to 2G) 1994: FCC auctioned spectrum in Personal Communication Service (PCS) band

Cetiner, Bedri A.

180

RESTRAINING SYSTEM FOR PLETHYSMOGRAPHY IN SMALL ANIMALS  

EPA Science Inventory

A restraining technique for immobilizing awake guinea pigs and rats during physiological measurements is described. The basic device consists of an adjustable acrylic holder that supports the animal in a standing position while restricting movement of the four legs. The holder al...

181

Evolution of a radio communication relay system  

NASA Astrophysics Data System (ADS)

Providing long-distance non-line-of-sight control for unmanned ground robots has long been recognized as a problem, considering the nature of the required high-bandwidth radio links. In the early 2000s, the DARPA Mobile Autonomous Robot Software (MARS) program funded the Space and Naval Warfare Systems Center (SSC) Pacific to demonstrate a capability for autonomous mobile communication relaying on a number of Pioneer laboratory robots. This effort also resulted in the development of ad hoc networking radios and software that were later leveraged in the development of a more practical and logistically simpler system, the Automatically Deployed Communication Relays (ADCR). Funded by the Joint Ground Robotics Enterprise and internally by SSC Pacific, several generations of ADCR systems introduced increasingly more capable hardware and software for automatic maintenance of communication links through deployment of static relay nodes from mobile robots. This capability was finally tapped in 2010 to fulfill an urgent need from theater. 243 kits of ruggedized, robot-deployable communication relays were produced and sent to Afghanistan to extend the range of EOD and tactical ground robots in 2012. This paper provides a summary of the evolution of the radio relay technology at SSC Pacific, and then focuses on the latest two stages, the Manually-Deployed Communication Relays and the latest effort to automate the deployment of these ruggedized and fielded relay nodes.

Nguyen, Hoa G.; Pezeshkian, Narek; Hart, Abraham; Burmeister, Aaron; Holz, Kevin; Neff, Joseph; Roth, Leif

2013-05-01

182

Human Communication Systems Evolve by Cultural Selection  

E-print Network

Human communication systems, such as language, evolve culturally; their components undergo reproduction and variation. However, a role for selection in cultural evolutionary dynamics is less clear. Often neutral evolution (also known as 'drift') models, are used to explain the evolution of human communication systems, and cultural evolution more generally. Under this account, cultural change is unbiased: for instance, vocabulary, baby names and pottery designs have been found to spread through random copying. While drift is the null hypothesis for models of cultural evolution it does not always adequately explain empirical results. Alternative models include cultural selection, which assumes variant adoption is biased. Theoretical models of human communication argue that during conversation interlocutors are biased to adopt the same labels and other aspects of linguistic representation (including prosody and syntax). This basic alignment mechanism has been extended by computer simulation to account for the em...

Fay, Nicolas; Ellison, T Mark; Barr, Dale

2014-01-01

183

Electronics systems test laboratory testing of shuttle communications systems  

NASA Technical Reports Server (NTRS)

Shuttle communications and tracking systems space to space and space to ground compatibility and performance evaluations are conducted in the NASA Johnson Space Center Electronics Systems Test Laboratory (ESTL). This evaluation is accomplished through systems verification/certification tests using orbiter communications hardware in conjunction with other shuttle communications and tracking external elements to evaluate end to end system compatibility and to verify/certify that overall system performance meets program requirements before manned flight usage. In this role, the ESTL serves as a multielement major ground test facility. The ESTL capability and program concept are discussed. The system test philosophy for the complex communications channels is described in terms of the major phases. Results of space to space and space to ground systems tests are presented. Several examples of the ESTL's unique capabilities to locate and help resolve potential problems are discussed in detail.

Stoker, C. J.; Bromley, L. K.

1985-01-01

184

The Anima Animation System, Version 2.0  

E-print Network

The Anima Animation System, Version 2.0 Danielle Sauer, Jared Gabruch, Cara Gibbs, Howard Hamilton Department of Computer Science University of Regina Regina, Saskatchewan, CANADA S4S 0A2 ISSN 0828-3494 ISBN ...............................................................................................................20 1 #12;The Anima Animation System, Version 2.0 Danielle Sauer, Jared Gabruch, Cara Gibbs, Howard

Hamilton, Howard J.

185

A packet switched communications system for GRO  

NASA Technical Reports Server (NTRS)

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

1993-01-01

186

Degree project in Communication Systems  

E-print Network

A R A D O G A N Evaluating WebSocket and WebRTC in the Context of a Mobile Internet of Things Gateway of a Mobile Internet of Things Gateway Gunay Mert Karadogan Master of Science Thesis Embedded Systems School to the Internet in order to foster an Internet of Things (IoT). This thesis project aims to solve the problem

Maguire Jr., Gerald Q.

187

Evaluations of gestural animations to convey feelings in asynchronous network communication  

Microsoft Academic Search

The paper deals with nonverbal communication in asynchronous networks. It is well known that nonverbal communication plays an important role in interpersonal communication. However, nonverbal communication has not been used in traditional character based network communication until now, yet the need for conveying feelings has increased. Due to the development of multimedia networks, it is thought that nonverbal communication can

Tomoo Inoue; Ken-ichi Okada; Y. Matsushita

1995-01-01

188

Clock Sources for Synchronized Communication Systems  

Microsoft Academic Search

The ideal clock source will have start-stop capability, maintain known phase with respect to a start signal and combine high-frequency stability with voltage tuning to permit phase lock and Doppler correction. These properties define a clock source suitable for synchronized communication systems in which a remote unit must be started in synchronism with the signal received from a local unit.

Richard C. Mackey

1962-01-01

189

Communication protocol standards for space data systems  

Microsoft Academic Search

The main elements and requirements of advanced space data networks are identified. The communication protocol standards for use on space missions during the coming decades are described. In particular, the blending of high-performance space-unique data transmission techniques with off-the-shelf open systems interconnection (OSI) protocols is described.

Adrian J. Hooke; Richard Desjardins

1990-01-01

190

Communication protocol standards for space data systems  

Microsoft Academic Search

The main elements and requirements of advanced space data networks are identified. The communication protocol standards for use on space missions during the coming decades are described. In particular, the blending of high-performance space-unique data transmission techniques with off-the-shelf open systems interconnection (OSI) protocols is described

A. J. Hooke; R. des Jardins

1990-01-01

191

Mobility of a Disaster Recover Communication System  

Microsoft Academic Search

What is the best platform to build a Disaster Management Communication System (DMCS)? There is a need to investigate how to best use a DMCS. The two most important uses of a DMCS for any size disaster, is the need for information and getting relief to those that need it. The DMCS needs to collect information from the people affected

Edward Sobanski; Barbara Nicolai

2011-01-01

192

How information systems communicate as documents  

E-print Network

the mechanism of voice may work to persuasively communicate a point of view on the materials being collected and described by the information system. Design/methodology/approach ­ The paper synthesizes a conceptual is shown to function as a persuasive element by enabling identification, the rhetorical construct defined

Feinberg, Melanie

193

Wideband heterodyne receiver for laser communication system  

NASA Technical Reports Server (NTRS)

A heterodyne receiver for laser communication is described which includes a front end having a cooled photomixer contained in a hermetically sealed spaced quality housing designed for wide bandwidth transmission. The photomixer is coupled through a wideband preamplifier to the receiver back end which includes a frequency tracking network and demodulating equipment. The receiver is capable of tracking a Doppler frequency shift of 750 MHz, positive or negative, and has an instantaneous intermediate frequency information bandwidth of 400 MHz. The receiver system is also capable of operating over a wide temperature range and is designed to be suitable for use in outer space communication.

Flattau, T.; Lange, R. A.; Mellars, B.; Peyton, J.; Wolczok, J. M. (inventors)

1977-01-01

194

Animations  

NSDL National Science Digital Library

This collection contains animations of a nuclear chain reaction, nuclear fission and nuclear fusion. It also showcases interactive models of the first atomic bombs and simulation of the "Nuclear Winter" effect.

Griffith, Christopher

195

Parallel processing spacecraft communication system  

NASA Technical Reports Server (NTRS)

An uplink controlling assembly speeds data processing using a special parallel codeblock technique. A correct start sequence initiates processing of a frame. Two possible start sequences can be used; and the one which is used determines whether data polarity is inverted or non-inverted. Processing continues until uncorrectable errors are found. The frame ends by intentionally sending a block with an uncorrectable error. Each of the codeblocks in the frame has a channel ID. Each channel ID can be separately processed in parallel. This obviates the problem of waiting for error correction processing. If that channel number is zero, however, it indicates that the frame of data represents a critical command only. That data is handled in a special way, independent of the software. Otherwise, the processed data further handled using special double buffering techniques to avoid problems from overrun. When overrun does occur, the system takes action to lose only the oldest data.

Bolotin, Gary S. (Inventor); Donaldson, James A. (Inventor); Luong, Huy H. (Inventor); Wood, Steven H. (Inventor)

1998-01-01

196

Energy efficiency in wireless communication systems  

DOEpatents

Wireless communication systems and methods utilize one or more remote terminals, one or more base terminals, and a communication channel between the remote terminal(s) and base terminal(s). The remote terminal applies a direct sequence spreading code to a data signal at a spreading factor to provide a direct sequence spread spectrum (DSSS) signal. The DSSS signal is transmitted over the communication channel to the base terminal which can be configured to despread the received DSSS signal by a spreading factor matching the spreading factor utilized to spread the data signal. The remote terminal and base terminal can dynamically vary the matching spreading factors to adjust the data rate based on an estimation of operating quality over time between the remote terminal and base terminal such that the amount of data being transmitted is substantially maximized while providing a specified quality of service.

Caffrey, Michael Paul; Palmer, Joseph McRae

2012-12-11

197

Land-mobile satellite communication system  

NASA Technical Reports Server (NTRS)

A satellite communications system includes an orbiting communications satellite for relaying communications to and from a plurality of ground stations, and a network management center for making connections via the satellite between the ground stations in response to connection requests received via the satellite from the ground stations, the network management center being configured to provide both open-end service and closed-end service. The network management center of one embodiment is configured to provides both types of service according to a predefined channel access protocol that enables the ground stations to request the type of service desired. The channel access protocol may be configured to adaptively allocate channels to open-end service and closed-end service according to changes in the traffic pattern and include a free-access tree algorithm that coordinates collision resolution among the ground stations.

Yan, Tsun-Yee (Inventor); Rafferty, William (Inventor); Dessouky, Khaled I. (Inventor); Wang, Charles C. (Inventor); Cheng, Unjeng (Inventor)

1993-01-01

198

Active Sensing by Unmanned Aircraft Systems in Realistic Communication  

E-print Network

Active Sensing by Unmanned Aircraft Systems in Realistic Communication Environments Eric W. Frew-theoretic framework for active sensing by unmanned aircraft systems in realistic communication environments of the active sensing framework. Keywords: active sensing, unmanned aircraft systems, stochastic approximation

Frew, Eric W.

199

64 FR 18652 - Design Approval of Aircraft Data Communications Systems  

Federal Register 2010, 2011, 2012, 2013

...Communication Systems. The proposed...of aircraft data communication systems and applications...Aircraft Engineering Division...Aircraft Engineering Division, Avionic Systems Branch, AIR-130...such written data, views,...

1999-04-15

200

Communication System Recognition by Modulation Recognition  

Microsoft Academic Search

\\u000a Communication system recognition is major part of some civilian and military applications. The recognition of the system is\\u000a done by inspecting the received signal properties like modulation type, carrier frequency, baud rate and so on. Therefore\\u000a we need Automatic Modulation Recognition (AMR) methods plus carrier and baud rate estimation methods. In this paper we introduce\\u000a a new AMR method based

Ali Reza Attar; Abbas Sheikhi; Ali Zamani

2004-01-01

201

CLASSIFICATION OF THE MGR SITE COMMUNICATIONS SYSTEM  

SciTech Connect

The purpose of this analysis is to document the Quality Assurance (QA) classification of the Monitored Geologic Repository (MGR) site communications system structures, systems and components (SSCs) performed by the MGR Safety Assurance Department. This analysis also provides the basis for revision of YMP/90-55Q, Q-List (YMP 1998). The Q-List identifies those MGR SSCs subject to the requirements of DOE/RW-0333P, ''Quality Assurance Requirements and Description'' (QARD) (DOE 1998).

J. Ziegler

1999-08-31

202

Vocal Corollary Discharge Communicates Call Duration to Vertebrate Auditory System  

PubMed Central

Corollary discharge is essential to an animal's ability to filter self-generated from external stimuli. This includes acoustic communication, although direct demonstration of a corollary discharge that both conveys a vocal motor signal and informs the auditory system about the physical attributes of a self-generated vocalization has remained elusive for vertebrates. Here, we show the underlying synaptic activity of a neuronal vocal corollary discharge pathway in the hindbrain of a highly vocal species of fish. Neurons carrying the vocal corollary discharge are specifically adapted for the transmission of duration information, a predominant acoustic cue. The results reveal that vertebrates, like some insects, have a robust corollary discharge conveying call duration. Along with evidence for the influence of vocal duration on auditory encoding in mammals, these new findings suggest that linking vocal motor and corollary discharge pathways with pattern generating, call duration neurons is a shared network character across the animal kingdom. PMID:24285884

2013-01-01

203

Map synchronization in optical communication systems  

NASA Technical Reports Server (NTRS)

The time synchronization problem in an optical communication system is approached as a problem of estimating the arrival time (delay variable) of a known transmitted field. Maximum aposteriori (MAP) estimation procedures are used to generate optimal estimators, with emphasis placed on their interpretation as a practical system device, Estimation variances are used to aid in the design of the transmitter signals for best synchronization. Extension is made to systems that perform separate acquisition and tracking operations during synchronization. The closely allied problem of maintaining timing during pulse position modulation is also considered. The results have obvious application to optical radar and ranging systems, as well as the time synchronization problem.

Gagliardi, R. M.; Mohanty, N.

1973-01-01

204

Communications and tracking expert systems study  

NASA Technical Reports Server (NTRS)

The original objectives of the study consisted of five broad areas of investigation: criteria and issues for explanation of communication and tracking system anomaly detection, isolation, and recovery; data storage simplification issues for fault detection expert systems; data selection procedures for decision tree pruning and optimization to enhance the abstraction of pertinent information for clear explanation; criteria for establishing levels of explanation suited to needs; and analysis of expert system interaction and modularization. Progress was made in all areas, but to a lesser extent in the criteria for establishing levels of explanation suited to needs. Among the types of expert systems studied were those related to anomaly or fault detection, isolation, and recovery.

Leibfried, T. F.; Feagin, Terry; Overland, David

1987-01-01

205

Acoustic system for communication in pipelines  

DOEpatents

A system for communication in a pipe, or pipeline, or network of pipes containing a fluid. The system includes an encoding and transmitting sub-system connected to the pipe, or pipeline, or network of pipes that transmits a signal in the frequency range of 3-100 kHz into the pipe, or pipeline, or network of pipes containing a fluid, and a receiver and processor sub-system connected to the pipe, or pipeline, or network of pipes containing a fluid that receives said signal and uses said signal for a desired application.

Martin, II, Louis Peter (San Ramon, CA); Cooper, John F. (Oakland, CA)

2008-09-09

206

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

207

Farm animal well-being and intensive production systems.  

PubMed

Animal welfare, or well-being, is a social issue with ethical, scientific, political, and aesthetic properties. Answering questions about the welfare of animals requires scientific definition, assessment, solutions, and public acceptance. With respect to the actual well-being of the animal, most issues are centered on how the animal "feels" when managed within a specific level of confinement, during special agricultural practices (e.g., tail docking, beak trimming, etc.) and handling. Questions of this nature may require exploration of animal cognition, motivation, perception, and emotional states in addition to more commonly recognized indicators of well-being. Several general approaches have emerged for solving problems concerning animal well-being in intensive production systems: environmental, genetic, and therapeutic. Environmental approaches involve modifying existing systems to accommodate specific welfare concerns or development of alternative systems. Genetic approaches involve changing the behavioral and (or) physiological nature of the animal to reduce or eliminate behaviors that are undesirable within intensive system. Therapeutic approaches of a physical (tail docking, beak trimming) and physiological (drug and nutritional therapy) nature bring both concern and promise with regard to the reduction of confinement stress. Finally, the recent focus on commodity quality assurance programs may indirectly provide benefits for animal well-being. Although research in the area of animal well-being will provide important information for better animal management, handling, care, and the physical design of intensive production systems there is still some uncertainty regarding public acceptance. The aesthetics of modern intensive production systems may have as much to do with public acceptance as with science. PMID:8582867

Swanson, J C

1995-09-01

208

Integrated communications and optical navigation system  

NASA Astrophysics Data System (ADS)

The Integrated Communications and Optical Navigation System (ICONS) is a flexible navigation system for spacecraft that does not require global positioning system (GPS) measurements. The navigation solution is computed using an Unscented Kalman Filter (UKF) that can accept any combination of range, range-rate, planet chord width, landmark, and angle measurements using any celestial object. Both absolute and relative orbit determination is supported. The UKF employs a full nonlinear dynamical model of the orbit including gravity models and disturbance models. The ICONS package also includes attitude determination algorithms using the UKF algorithm with the Inertial Measurement Unit (IMU). The IMU is used as the dynamical base for the attitude determination algorithms. This makes the sensor a more capable plug-in replacement for a star tracker, thus reducing the integration and test cost of adding this sensor to a spacecraft. Recent additions include an integrated optical communications system which adds communications, and integrated range and range rate measurement and timing. The paper includes test results from trajectories based on the NASA New Horizons spacecraft.

Mueller, J.; Pajer, G.; Paluszek, M.

2013-12-01

209

Orbiter Interface Unit and Early Communication System  

NASA Technical Reports Server (NTRS)

This report describes the Orbiter Interface Unit (OIU) and the Early Communication System (ECOMM), which are systems of electronic hardware and software that serve as the primary communication links for the International Space Station (ISS). When a space shuttle is at or near the ISS during assembly and resupply missions, the OIU sends groundor crew-initiated commands from the space shuttle to the ISS and relays telemetry from the ISS to the space shuttle s payload data systems. The shuttle then forwards the telemetry to the ground. In the absence of a space shuttle, the ECOMM handles communications between the ISS and Johnson Space Center via the Tracking and Data Relay Satellite System (TDRSS). Innovative features described in the report include (1) a "smart data-buffering algorithm that helps to preserve synchronization (and thereby minimize loss) of telemetric data between the OIU and the space-shuttle payload data interleaver; (2) an ECOMM antenna-autotracking algorithm that selects whichever of two phased-array antennas gives the best TDRSS signal and electronically steers that antenna to track the TDRSS source; and (3) an ECOMM radiation-latchup controller, which detects an abrupt increase in current indicative of radiation-induced latchup and temporarily turns off power to clear the latchup, restoring power after the charge dissipates.

Cobbs, Ronald M.; Cooke, Michael P.; Cox, Gary L.; Ellenberger, Richard; Fink, Patrick W.; Haynes, Dena S.; Hyams, Buddy; Ling, Robert Y.; Neighbors, Helen M.; Phan, Chau T.; Prendergast, Kelly M.; Siekierski, James D.; Wade, Randall S.; Weisskopf, George A.; Yim, Hester J.; Adkins, Antha A.; Carl, James R..; Loh, Y. C.; Roberts, Charles; Steele, Douglas J.; DeSilva, Buveneka Kanishka; Killenb, Harold B.; Williams, Robert M.

2004-01-01

210

Tri-modality small animal imaging system  

SciTech Connect

Our group is developing a scanner that combines x-ray, single gamma, and optical imaging on the same rotating gantry. Two functional modalities (SPECT and optical) are included because they have different strengths and weaknesses in terms of spatial and temporal decay lengths in the context of in vivo imaging, and because of the recent advent of multiple reporter gene constructs. The effect of attenuation by biological tissue on the detected intensity of the emitted signal was measured for both gamma and optical imaging. Attenuation by biological tissue was quantified for both the bioluminescent emission of luciferace and for the emission light of the near infrared fluorophore cyanine 5.5, using a fixed excitation light intensity. Experiments were performed to test the feasibility of using either single gamma or x-ray imaging to make depth-dependent corrections to the measured optical signal. Our results suggest that significant improvements in quantitation of optical emission are possible using straightforward correction techniques based on information from other modalities. Development of an integrated scanner in which data from each modality are obtained with the animal in a common configuration will greatly simplify this process.

Kundu, B.K.; Stolin, A.V.; Pole, J.; Baumgart, L.; Fontaine, M.; Wojcik, R.; Kross, B.; Zorn, C.; Majewski, S.; Williams, M.B.

2006-02-01

211

Multi-access laser communications transceiver system  

NASA Technical Reports Server (NTRS)

A satellite system for optical communications such as a multi-access laser transceiver system. Up to six low Earth orbiting satellites send satellite data to a geosynchronous satellite. The data is relayed to a ground station at the Earth's surface. The earth pointing geosynchronous satellite terminal has no gimbal but has a separate tracking mechanism for tracking each low Earth orbiting satellite. The tracking mechanism has a ring assembly rotatable about an axis coaxial with the axis of the field of view of the geosynchronous satellite and a pivotable arm mounted for pivotal movement on the ring assembly. An optical pickup mechanism at the end of each arm is positioned for optical communication with one of the orbiting satellites by rotation of the ring.

Ross, Monte (Inventor); Lokerson, Donald C. (Inventor); Fitzmaurice, Michael W. (Inventor); Meyer, Daniel D. (Inventor)

1993-01-01

212

Space Station Information System integrated communications concept  

NASA Technical Reports Server (NTRS)

This paper presents a model for integrated communications within the Space Station Information System (SSIS). The SSIS is generally defined as the integrated set of space and ground information systems and networks which will provide required data services to the Space Station flight crew, ground operations personnel, and customer communities. This model is based on the International Standards Organization (ISO) layered model for Open Systems Interconnection (OSI). The requirements used to develop the model are presented, and the various elements of the model described.

Muratore, J.; Bigham, J.; Whitelaw, V.; Marker, W.

1987-01-01

213

VHF downlink communication system for SLAR data  

NASA Technical Reports Server (NTRS)

This paper describes a real-time VHF downlink communication system for transmitting side-looking airborne-radar (SLAR) data directly from an aircraft to a portable ground/shipboard receiving station. Use of this receiving station aboard the U.S. Coast Guard icebreaker Mackinaw for generating real-time photographic quality radar images will be discussed. The system was developed and demonstrated in conjunction with the U.S. Coast Guard and NOAA National Weather Service as part of the Project Icewarn all-weather ice information system for the Great Lakes Winter Navigation Program.

Schertler, R. J.; Chase, T. L.; Mueller, R. A.; Kramarchuk, I.; Jirberg, R. J.; Gedney, R. T.

1979-01-01

214

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, Shyhliang A.; Wong, Albert W. K.; Andriole, Katherine P.; Bazzill, Todd M.; Avrin, David A.; Gould, Robert G.

1994-05-01

215

Electronic circuits for communications systems: A compilation  

NASA Technical Reports Server (NTRS)

The compilation of electronic circuits for communications systems is divided into thirteen basic categories, each representing an area of circuit design and application. The compilation items are moderately complex and, as such, would appeal to the applications engineer. However, the rationale for the selection criteria was tailored so that the circuits would reflect fundamental design principles and applications, with an additional requirement for simplicity whenever possible.

1972-01-01

216

Channel simulation for optical communication systems  

NASA Technical Reports Server (NTRS)

A technique is reported for simulating the signal fading that will be experienced by typical optical communication systems. The desired irradiance or amplitude fading statistics can be simulated by incorporating a linearized optical modulator subsystem between the transmitter and receiver. This technique has been implemented in the design and construction of a laboratory channel simulator. The design of the processing electronics is discussed along with the results of tests performed for each mode of operation.

Tycz, M.; Fitzmaurice, M. W.

1974-01-01

217

46 CFR 169.713 - Engineroom communication system.  

Code of Federal Regulations, 2011 CFR

...2011-10-01 false Engineroom communication system. 169.713 Section...SECURITY (CONTINUED) NAUTICAL SCHOOLS SAILING SCHOOL VESSELS Vessel Control... § 169.713 Engineroom communication system. An efficient...

2011-10-01

218

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

2007-04-01

219

Animation of Dawn's Path Through the Solar System  

NASA Video Gallery

This animation shows the path of NASA's Dawn spacecraft through the solar system, on its way to orbit the two most massive objects in the main asteroid belt. Dawn arrives at the protoplanet Vesta i...

220

Low-frequency wireless communications System-infrared laboratory experiments  

Microsoft Academic Search

A communications systems course laboratory component using an infrared (IR) communication system has been developed as part of the wireless education initiative at the Rose-Hulman Institute of Technology (RHIT), Terre Haute, IN. Students build the system up over several laboratory periods from distinct subsystems, each of which illustrates specific communications concepts. The multiweek laboratory project has the features of being

Wayne T. Padgett; Bruce A. Black; Bruce A. Ferguson

2006-01-01

221

Integrated Energy and Communications System Architecture  

NSDL National Science Digital Library

A consortium of the Electricity Innovation Institute is developing an "an open, standards-based systems architecture for the data communications and distributed computing infrastructure that will enable the integration of a wide variety of intelligent electric power system components." Citing the overloaded U.S. power grid and changing trends in electricity demand, the consortium is advocating new technologies such as a self-healing grid and advanced monitoring capabilities. This Web site outlines the scope of the project and the motivation for conducting the work. Additionally, a white paper is provided that discusses the finer technical and implementation details of the proposed changes.

222

Odyssey, an optimized personal communications satellite system  

NASA Astrophysics Data System (ADS)

Personal communications places severe demands on service providers and transmission facilities. Customers are not satisfied with the current levels of service and want improvements. Among the characteristics that users seek are: lower service rates, hand held convenience, acceptable time delays, ubiquitous service, high availability, reliability, and high quality. The space industry is developing commercial space systems for providing mobile communications to personal telephones. Provision of land mobile satellite service is fundamentally different from the fixed satellite service provided by geostationary satellites. In fixed service, the earth based antennas can depend on a clear path from user to satellite. Mobile users in a terrestrial environment commonly encounter blockage due to vegetation, terrain or buildings. Consequently, high elevation angles are of premium value. TRW studied the issues and concluded that a Medium Earth Orbit constellation is the best solution for Personal Communications Satellite Service. TRW has developed Odyssey, which uses twelve satellites in medium altitude orbit to provide personal communications satellite service. The Odyssey communications system projects a multibeam antenna pattern to the Earth. The attitude control system orients the satellites to ensure constant coverage of land mass and coastal areas. Pointing can be reprogrammed by ground control to ensure optimized coverage of the desired service areas. The payload architecture features non-processing, "bent pipe" transponders and matrix amplifiers to ensure dynamic power delivery to high demand areas. Circuit capacity is 3000 circuits per satellite. Each satellite weighs 1917 kg (4226 pounds) at launch and the solar arrays provide 3126 Watts of power. Satellites are launched in pairs on Ariane, Atlas, or other vehicles. Each satellite is placed in a circular orbit at an altitude of 10,354 km. There are three orbit planes inclined at 55° to the equatorial plane. Deployment of the satellites permits phased introduction of service. After only three launches, in which two satellites are launched into each plane, continuous service can be provided to most of the world. After three more launches for a total of 12 satellites, service can be expanded to all populated regions of the Earth with path diversity to most regions. The Odyssey system is superior to both geostationary satellites and low earth orbiting satellites. Odyssey provides many benefits to the end user which are described in the paper. These include: low cost, convenience, high availability, reliability, and acceptable time delay. Odyssey exhibits benefits for telecommunications operators: simple operations, incremental, phased startup, long space segment life-time, high profitability, dynamic flexibility for adjustment and short time to market. Since submission of an FCC application in 1991, TRW has continued to explore ways to further improve the Odyssey approach by expanding coverage to the entire world and reducing the initial investment while maintaining high quality service.

Rusch, Roger J.

223

Human Factors Aspects of Power System Flow Animation  

E-print Network

system flows can be used successfully in displays to improve both the speed and accuracy of certain tasks. Index Terms--Power System Operations and Planning, Power System Visualization, Animation, Human Factors operators and engineers to quickly process a vastly increased amount of information. To meet this need

224

COMMUNICATION SYSTEMS AND STUDY METHOD FOR ACTIVE DISTRIBUTION POWER SYSTEMS  

E-print Network

of Intelligent Electronic Devices (IED) in modern distributed power system need to exchange large amount of information for system monitoring, protection and control. Therefore the alternative communication techniques toward Smart Grid, which means an electricity network that can intelligently integrate the actions of all

Chen, Zhe

225

On Communication and Flocking in Multi-Robot Systems  

E-print Network

with obstacle avoidance. The communication-aware trajectory tracking is adapted to radio communica- tionOn Communication and Flocking in Multi-Robot Systems MAGNUS LINDHÃ? Licentiate Thesis Stockholm;Abstract Coordination of multi-robot systems to improve communication and achieve ock- ing is the topic

Johansson, Karl Henrik

226

Communication and System Relevance in Liver Damage and Regeneration  

E-print Network

SFB 974 Communication and System Relevance in Liver Damage and Regeneration Speaker: Prof. Dr "Communication and System Relevance in Liver Damage and Regeneration" is inviting medical students to apply insights into mechanisms, communication and decision processes that govern liver regeneration and damage

Schiller, Stephan

227

A Dispatch-Mediated Communication Model for Emergency Response Systems  

E-print Network

2 A Dispatch-Mediated Communication Model for Emergency Response Systems ROHIT VALECHA and RAJ of emergency communication is dispatch-mediated (the messages from the scene are directed towards, dispatch-mediated communication, emergency response systems ACM Reference Format: Valecha, R., Sharman, R

Upadhyaya, Shambhu

228

Crew/computer communications study. Volume 1: Final report. [onboard computerized communications system for spacecrews  

NASA Technical Reports Server (NTRS)

Techniques, methods, and system requirements are reported for an onboard computerized communications system that provides on-line computing capability during manned space exploration. Communications between man and computer take place by sequential execution of each discrete step of a procedure, by interactive progression through a tree-type structure to initiate tasks or by interactive optimization of a task requiring man to furnish a set of parameters. Effective communication between astronaut and computer utilizes structured vocabulary techniques and a word recognition system.

Johannes, J. D.

1974-01-01

229

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

2013-01-01

230

Photodiodes for ten micrometer laser communication systems  

NASA Technical Reports Server (NTRS)

The performance is discussed of 10-micron mercury-cadmiumtelluride and lead-tin-telluride photodiodes in laser heterodyne communication systems. The dependence of detector quantum efficiency, resistance, frequency response, and signal-to-noise ratio on temperature, bias, and local oscillator power are examined. Included in the discussion is an analysis of the feasibility of high temperature operation, and ability of the detector to dissipate power to a heat sink is explored. Some aspects of direct detection response are considered and figures showing flux levels from a blackbody presented.

Cohen, S. C.

1972-01-01

231

Communicating Research to Small Drinking Water Systems: Dissemination by Researchers  

EPA Science Inventory

This talk discusses the challenges of disseminating research relevant to small systems. The presentation discusses efforts by the U.S. EPA’s Office of Research and Development to effectively communicating drinking water information. In particular, communication approaches ...

232

Random digital encryption secure communication system  

NASA Technical Reports Server (NTRS)

The design of a secure communication system is described. A product code, formed from two pseudorandom sequences of digital bits, is used to encipher or scramble data prior to transmission. The two pseudorandom sequences are periodically changed at intervals before they have had time to repeat. One of the two sequences is transmitted continuously with the scrambled data for synchronization. In the receiver portion of the system, the incoming signal is compared with one of two locally generated pseudorandom sequences until correspondence between the sequences is obtained. At this time, the two locally generated sequences are formed into a product code which deciphers the data from the incoming signal. Provision is made to ensure synchronization of the transmitting and receiving portions of the system.

Doland, G. D. (inventor)

1982-01-01

233

Navy satellite communications systems in transition  

NASA Astrophysics Data System (ADS)

Navy SATCOM programs require advanced system engineering, program management, and long range planning to improve satellite and ground system technology. Solutions are being sought to develop Navy transitional issues within the framework of the total Defense MILSATCOM architecture. Several of the Navy SATCOM transition issues are discussed: the current Navy SATCOM baseline, consisting of three GAPFILLER (MARISAT) satellites and a constellation of geosynchronous FLTSATCOM satellites; a Demand Assignment time-division Multiple Access (DAMA) system, which permits a more efficient use of the 25 kHz FLTSAT hard-limiting transponders. A leased satellite (LEASAT) will provide extended UHF SATCOM service at four geosynchronous orbital locations. The navy also plans to increase connectivity, capacity, and AJ protection of Fleet Satellite Communications by introduction of SHF service.

Newell, J. W.

234

Field Programmable Communication Emulation and Optimization for Embedded System Design  

Microsoft Academic Search

The generation of application-specific communication architectures is a time consuming and error prone task in embedded system\\u000a design. In most design environments the evaluation of generated communication structures is done by cosimulation only. In\\u000a this paper we present an approach to architecture-precise embedded system communication emulation using a reconfigurable rapid\\u000a prototyping platform, hardware monitoring of the emulated communication structure as

Frank-michael Renner; Jürgen Becker; Manfred Glesner

2000-01-01

235

Integrated source and channel encoded digital communication system design study  

NASA Technical Reports Server (NTRS)

This study investigated the configuration and integration of a wideband communication system with a Ku-band rendezvous radar system. The goal of the study was to provide as much commonality between the two systems as possible. The antenna design was described with the only change being the requirement for dual polarization (linear for the radar system and circular for the communication system).

Huth, G. K.; Udalov, S.

1974-01-01

236

Ultrasonic speech translator and communications system  

SciTech Connect

A wireless communication system undetectable by radio frequency methods for converting audio signals, including human voice, to electronic signals in the ultrasonic frequency range, transmitting the ultrasonic signal by way of acoustical pressure waves across a carrier medium, including gases, liquids, or solids, and reconverting the ultrasonic acoustical pressure waves back to the original audio signal. The ultrasonic speech translator and communication system includes an ultrasonic transmitting device and an ultrasonic receiving device. The ultrasonic transmitting device accepts as input an audio signal such as human voice input from a microphone or tape deck. The ultrasonic transmitting device frequency modulates an ultrasonic carrier signal with the audio signal producing a frequency modulated ultrasonic carrier signal, which is transmitted via acoustical pressure waves across a carrier medium such as gases, liquids or solids. The ultrasonic receiving device converts the frequency modulated ultrasonic acoustical pressure waves to a frequency modulated electronic signal, demodulates the audio signal from the ultrasonic carrier signal, and conditions the demodulated audio signal to reproduce the original audio signal at its output. 7 figs.

Akerman, M.A.; Ayers, C.W.; Haynes, H.D.

1996-07-23

237

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

238

Laser Communication Demonstration System (LSCS) and Future Mobile Satellite Services  

NASA Technical Reports Server (NTRS)

The Laser Communications Demonstration System (LCDS) is a proposed in-orbit demonstration of high data rate laser communications technology conceived jointly by NASA and U.S. industry. The program objectives are to stimulate industry development and to demonstrate the readiness of high data rate optical communications in Earth Orbit. For future global satellite communication systems using intersatellite links (ISLs), laser communications technology can offer reduced mass , reduced power requirements, and increased channel bandwidths without regulatory restraint. This paper provides comparisons with radio systems and status of the program.

Chen, C. -C.; Lesh, J. R.

1995-01-01

239

Odyssey, an optimized personal communications satellite system  

NASA Astrophysics Data System (ADS)

Personal communications places severe demands on service providers and transmission facilities. Customers are not satisfied with the current levels of service and want improvements. Among the characteristics that users seek are: lower service rates, hand held convenience, acceptable time delays, ubiquitous service, high availability, reliability, and high quality. The space industry in developing commercial space systems for providing mobile communications to personal telephones. Provision of land mobile satellite service is fundamentally different from the fixed satellite service provided by geostationary satellites. In fixed service, the earth based antennas can depend on a clear path from user to satellite. Mobile users in a terrestrial environment commonly encounter blockage due to vegetation, terrain or buildings. Consequently, high elevation angles are of premium value. TRW studied the issues and concluded that a Medium Earth Orbit constellation is the best solution for Personal Communications Satellite Service. TRW has developed Odyssey, which uses twelve satellites in medium altitude orbit to provide personal communications satellite service. The Odyssey communications system projects a multibeam antenna pattern to the Earth. The attitude control system orients the satellites to ensure constant coverage of land mass and coastal areas. Pointing can be reprogrammed by ground control to ensure optimized coverage of the desired service areas. The payload architecture features non-processing, 'bent pipe' transponders and matrix amplifiers to ensure dynamic power delivery to high demand areas. Circuit capacity is 3000 circuits per satellite. Each satellite weighs 1917 kg (4226 pounds) at launch and the solar arrays provide 3126 watts of power. Satellites are launched in pairs on Ariane, Atlas, or other vehicles. Each satellite is placed in a circular orbit at an altitude of 10,354 km. system is superior to both geostationary satellites and low earth orbiting satellites. -Odyssey provides many benefits to the end user which are described in the paper. These include: low cost, convenience, high availability, reliability, and acceptable time delay. Odyssey exhibits benefits for telecommunications operators: simple operations, incremental, phased startup, long space segment life-time, high profitability, dynamic flexibility for adjustment and short time to market. %Since submission of an FCC application in 1991, TRW has continued to explore ways to further improve the Odyssey approach by expanding coverage to the entire world and reducing the initial investment while maintaining high quality service.

Rusch, Roger J.

240

Designing a wireless underwater optical communication system  

E-print Network

Though acoustic modems have long been the default wireless communication method for underwater applications due to their long range, the need for high speed communication has prompted the exploration of non-acoustic methods ...

Brundage, Heather

2010-01-01

241

Tone-activated, remote, alert communication system  

NASA Technical Reports Server (NTRS)

Pocket sized transmitter, frequency modulated by crystal derived tones, with integral loop antenna provides police with easy operating alert signal communicator which uses patrol car radio to relay signal. Communication channels are time shared by several patrol units.

Baker, C. D.; Couvillon, L. A.; Hubbard, W. P.; Kollar, F. J.; Postal, R. B.; Tegnelia, C. R.

1971-01-01

242

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.

243

Application of the Iridium Satellite System to Aeronautical Communications  

NASA Technical Reports Server (NTRS)

The next generation air transportation system will require greater air-ground communications capacity to accommodate more air traffic with increased safety and efficiency. Communications will remain primarily terrestrially based, but satellite communications will have an increased role. Inmarsat s aeronautical services have been approved and are in use for aeronautical safety communications provided by geostationary satellites. More recently the approval process for the Iridium low earth orbit constellation is nearing completion. The current Iridium system will be able to provide basic air traffic services communications suitable for oceanic, remote and polar regions. The planned second generation of the Iridium system, called Iridium NEXT, will provide enhanced capabilities and enable a greater role in the future of aeronautical communications. This paper will review the potential role of satellite communications in the future of air transportation, the Iridium approval process and relevant system testing, and the potential role of Iridium NEXT.

Kerczewski, Robert J.; Meza, Mike; Gupta, Om

2008-01-01

244

“KUPON” spacecraft of “Bankir” satellite communication and data transmitting system  

Microsoft Academic Search

The “KUPON” spacecraft is designed for data retranslation (data transmission, telefax, telephone) between subscribers of the satellite communication network. It was developed for the “Bankir” satellite communication and data transmitting system of the Central Bank of Russian Federation. The spacecraft was designed on the basis of the Lavochkin satellite communications. That has led to a decrease in terms of development

S. D. Koulikov; K. M. Pitchkhadze; V. I. Makarov; V. I. Kouznetsov

1998-01-01

245

A Robust Communication-Based Special Protection System  

Microsoft Academic Search

This article investigates the application of an exponential weighted moving average (EWMA) scheme to a previously introduced communication-based special protection system (SPS). The EWMA adds buffering to increase the robustness of the SPS in the presence of network congestion and other forms of communication disruption. The EWMA-enhanced SPS compensates for the network layer's lack of a communication guarantee to provide

Kenneth M. Hopkinson; Xiaoru Wang; Todd R. Andel; Ryan W. Thomas

2010-01-01

246

Establishing Conventional Communication Systems: Is Common Knowledge Necessary?  

ERIC Educational Resources Information Center

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…

Barr, Dale J.

2004-01-01

247

COMMUNICATION SKILLS USED BY INFORMATION SYSTEMS GRADUATES  

Microsoft Academic Search

Communication skills are consistently ranked as the most important skills for success by top executives. Effective communication is an essential component of organizational success. One estimate is that employees spend more than 75 percent of their time communicating in interpersonal situations, as well as on a variety of other levels within the organization and externally (7). Crucial to the future

Nancy Csapo; Richard D. Featheringham

248

Communication in reactive multiagent robotic systems  

Microsoft Academic Search

Multiple cooperating robots are able to complete many tasks more quickly and reliably than one robot alone. Communication between the robots can multiply their capabilities and effectiveness, but to what extent? In this research, the importance of communication in robotic societies is investigated through experiments on both simulated and real robots. Performance was measured for three different types of communication

Tucker R. Balch; Ronald C. Arkin

1994-01-01

249

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

250

Space-to-Space Communications System  

NASA Technical Reports Server (NTRS)

The Space-to-Space Communications System (SSCS) is an Ultra High Frequency (UHF) Time-Division-Multiple Access (TDMA) system that is designed, developed, and deployed by the NASA Johnson Space Center (JSC) to provide voice, commands, telemetry and data services in close proximity among three space elements: International Space Station (ISS), Space Shuttle Orbiter, and Extravehicular Mobility Units (EMU). The SSCS consists of a family of three radios which are, Space-to-Space Station Radio (SSSR), Space-to-Space Orbiter Radio (SSOR), and Space-to-Space Extravehicular Mobility Radio (SSER). The SSCS can support up to five such radios at a time. Each user has its own time slot within which to transmit voice and data. Continuous Phase Frequency Shift Keying (CPFSK) carrier modulation with a burst data rate of 695 kbps and a frequency deviation of 486.5 kHz is employed by the system. Reed-Solomon (R-S) coding is also adopted to ensure data quality. In this paper, the SSCS system requirements, operational scenario, detailed system architecture and parameters, link acquisition strategy, and link performance analysis will be presented and discussed

Tu, Kwei; Gaylor, Kent; Vitalpur, Sharada; Sham, Cathy

1999-01-01

251

17 A theory for complex systems: reactive animation  

E-print Network

17 A theory for complex systems: reactive animation Sol Efroni a,c , David Harelb and Irun R Approaches to Theory in Medicine'' is the name of this book. Multidisciplinary is easy to understand discuss concepts of theory, complexity, and understanding, and describe a visually dynamic way

Harel, David

252

40 CFR 792.90 - Animal and other test system care.  

Code of Federal Regulations, 2013 CFR

... 2013-07-01 false Animal and other test system care...LABORATORY PRACTICE STANDARDS Testing Facilities Operation § 792.90 Animal and other test system care...feeding, handling, and care of animals and other test...

2013-07-01

253

40 CFR 160.90 - Animal and other test system care.  

Code of Federal Regulations, 2013 CFR

... 2013-07-01 false Animal and other test system care...LABORATORY PRACTICE STANDARDS Testing Facilities Operation § 160.90 Animal and other test system care...feeding, handling, and care of animals and other test...

2013-07-01

254

40 CFR 792.90 - Animal and other test system care.  

Code of Federal Regulations, 2012 CFR

... 2012-07-01 false Animal and other test system care...LABORATORY PRACTICE STANDARDS Testing Facilities Operation § 792.90 Animal and other test system care...feeding, handling, and care of animals and other test...

2012-07-01

255

40 CFR 792.90 - Animal and other test system care.  

Code of Federal Regulations, 2011 CFR

... 2011-07-01 false Animal and other test system care...LABORATORY PRACTICE STANDARDS Testing Facilities Operation § 792.90 Animal and other test system care...feeding, handling, and care of animals and other test...

2011-07-01

256

40 CFR 160.90 - Animal and other test system care.  

Code of Federal Regulations, 2011 CFR

... 2011-07-01 false Animal and other test system care...LABORATORY PRACTICE STANDARDS Testing Facilities Operation § 160.90 Animal and other test system care...feeding, handling, and care of animals and other test...

2011-07-01

257

40 CFR 160.90 - Animal and other test system care.  

Code of Federal Regulations, 2012 CFR

... 2012-07-01 false Animal and other test system care...LABORATORY PRACTICE STANDARDS Testing Facilities Operation § 160.90 Animal and other test system care...feeding, handling, and care of animals and other test...

2012-07-01

258

40 CFR 160.90 - Animal and other test system care.  

Code of Federal Regulations, 2010 CFR

... 2010-07-01 false Animal and other test system care...LABORATORY PRACTICE STANDARDS Testing Facilities Operation § 160.90 Animal and other test system care...feeding, handling, and care of animals and other test...

2010-07-01

259

40 CFR 792.90 - Animal and other test system care.  

Code of Federal Regulations, 2010 CFR

... 2010-07-01 true Animal and other test system care...LABORATORY PRACTICE STANDARDS Testing Facilities Operation § 792.90 Animal and other test system care...feeding, handling, and care of animals and other test...

2010-07-01

260

16.36 Communication Systems Engineering, Spring 2003  

E-print Network

Introduces the fundamentals of digital communications and networking. Topics covered include elements of information theory, sampling and quantization, coding, modulation, signal detection and system performance in the ...

Modiano, Eytan H.

261

Channel and Delay Estimation Algorithms for Wireless Communication Systems.  

E-print Network

??This thesis addresses the problem of channel and propagation delay estimation in wireless communication systems. Channel estimation and equalization compensate for channel distortions. Consequently, transmitted… (more)

Sirbu, Marius

2003-01-01

262

Channel and delay estimation algorithms for wireless communication systems.  

E-print Network

??This thesis addresses the problem of channel and propagation delay estimation in wireless communication systems. Channel estimation and equalization compensate for channel distortions. Consequently, transmitted… (more)

Sirbu, Marius

2003-01-01

263

21 CFR 890.3700 - Nonpowered communication system.  

...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....

2014-04-01

264

21 CFR 890.3710 - Powered communication system.  

Code of Federal Regulations, 2012 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....

2012-04-01

265

21 CFR 890.3710 - Powered communication system.  

Code of Federal Regulations, 2011 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....

2011-04-01

266

21 CFR 890.3700 - Nonpowered communication system.  

Code of Federal Regulations, 2012 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....

2012-04-01

267

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 departure,…

Strauss, Andre

268

Architecting Communication Network of Networks for Space System of Systems  

NASA Technical Reports Server (NTRS)

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

Bhasin, Kul B.; Hayden, Jeffrey L.

2008-01-01

269

The Picture Exchange Communication System: Digital Photographs versus Picture Symbols  

ERIC Educational Resources Information Center

The Picture Exchange Communication System (PECS) is an augmentative and alternative system (AAC) used to improve and increase communication for children with Autism Spectrum Disorder (ASD) and other developmental disorders. Research addressing the efficacy of this system is increasing; however, there is limited information published that evaluates…

Jonaitis, Carmen

2011-01-01

270

A Proof Environment for the Development of Group Communication Systems  

E-print Network

deduction applicable to the imple- mentation of real-world systems by linking the Ensemble group com to the implementation of a real-world system. Our approach links Ensemble [11], a exible group communication toolkit system in order to improve its performance in concrete applications. 1 Introduction Group communication

271

A Proof Environment for the Development of Group Communication Systems  

E-print Network

deduction applicable to the imple- mentation of real-world systems by linking the Ensemble group com to the implementation of a real-world system. Our approach links Ensemble [11], a flexible group communication toolkit system in order to improve its performance in concrete applications. 1 Introduction Group communication

Kreitz, Christoph

272

A Communication-Centric Embedded System Architecture (ACCESA)  

Microsoft Academic Search

In the era of application convergence, the embedded systems are required to support multiple applications with different traffic patterns and quality of service (QoS) requirements. But continual process technology's shrinking trend makes the communication network of the embedded system the performance bottleneck for its increased latency. To ameliorate this problem, a communication-centric embedded system architecture (ACCESA) is proposed in this

Radha Guha

2009-01-01

273

A System for Inter-Library Communication (SILC). Final Report.  

ERIC Educational Resources Information Center

A study was made of the use of time-sharing computer systems as a means of communication, accounting, message switching, and referral in a System for Inter-Library Communication (SILC). The purpose of the study was to develop data on which to evaluate the feasibility of such a system; the results are reported in terms of four issues: technical…

Hayes, R. M.

274

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

275

Superconductors and cryogenics for future communication systems  

Microsoft Academic Search

In the framework of a German research program on “superconductors and ceramics for future communication technology”, efforts are undertaken to demonstrate the feasibility of cryogenic and high-temperature superconductor technology for applications in communication satellites and base transceiver stations (BTS's) for terrestrial mobile communication. For the receiver front end of C-band satellites, noise reduction filters as well as input-multiplexer channel filters

Matthias Klauda; T. Kasser; B. Mayer; C. Neumann; F. Schnell; B. Aminov; A. Baumfalk; H. Chaloupka; S. Kolesov; H. Piel; N. Klein; S. Schornstein; M. Bareiss

2000-01-01

276

50-Hz magnetic field exposure system for small animals.  

PubMed

The design, construction, and results of evaluation of an animal-exposure system for the study of biological effects of extremely low frequency (ELF) magnetic fields are described. The system uses a square coil arrangement based on a modification of the Helmholtz coil. Due to the cubic configuration of this exposure system, horizontal and vertical magnetic fields as high as 0.3 mT can be generated. Circularly polarized magnetic fields can also be generated by changing the current and phase difference between two sets of coils. Tests were made for uniformity of the magnetic field, stray fields, sham-exposure ratio of stray field, changes of temperature and humidity, light intensity and distribution inside the animal-housing space, and noise due to air-conditioning equipment. Variation of the magnetic field was less than 2% inside the animal housing. The stray-field level inside the sham-exposure system is less than 2% of experimental exposure levels. The system can be used for simultaneous exposure of 48 rats (2 to a cage) or 96 mice (4 to a cage). PMID:8494553

Shigemitsu, T; Takeshita, K; Shiga, Y; Kato, M

1993-01-01

277

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

278

MSFC Skylab instrumentation and communication system mission evaluation  

NASA Technical Reports Server (NTRS)

An evaluation of the in-orbit performance of the instrumentation and communications systems installed on Skylab is presented. Performance is compared with functional requirements and the fidelity of communications. In-orbit performance includes processing engineering, scientific, experiment, and biomedical data, implementing ground-generated commands, audio and video communication, generating rendezvous ranging information, and radio frequency transmission and reception. A history of the system evolution based on the functional requirements and a physical description of the launch configuration is included. The report affirms that the instrumentation and communication system satisfied all imposed requirements.

Adair, B. M.

1974-01-01

279

Suitability of ANSI standards for quantifying communication satellite system performance  

NASA Technical Reports Server (NTRS)

A study on the application of American National Standards X3.102 and X3.141 to various classes of communication satellite systems from the simple analog bent-pipe to NASA's Advanced Communications Technology Satellite (ACTS) is discussed. These standards are proposed as means for quantifying the end-to-end communication system performance of communication satellite systems. An introductory overview of the two standards are given followed by a review of the characteristics, applications, and advantages of using X3.102 and X3.141 to quantify with a description of the application of these standards to ACTS.

Cass, Robert D.

1988-01-01

280

Communications and control for electric power systems  

NASA Technical Reports Server (NTRS)

A long-term strategy for the integration of new control technologies for power generation and delivery is proposed: the industry would benefit from an evolutionary approach that would adapt to its needs future technologies as well as those that it has so far not heeded. The integrated operation of the entire system, including the distribution system, was proposed as a future goal. The AbNET communication protocols are reviewed, and additions that were made in 1991 are described. In the original network, traffic was controlled by polling at the master station, located at the substation, and routed by a flooding algorithm. In a revised version, the polling and flooding are modified. The question of interfacing low-energy measurement transducers or instrument transformers is considered. There is presently little or no agreement on what the output of optical current transducers (CT's) should be. Appendices deal with the calibration of current transducers; with Delta modulation, a simple means of serially encoding the output of an OCT; and with noise shaping, a method of digital signal processing that trades off the number of bits in a digital sample for a higher number of samples.

Kirkham, H.

1992-01-01

281

NASA Workshop on Animal Gravity-Sensing Systems  

NASA Technical Reports Server (NTRS)

The opportunity for space flight has brought about the need for well-planned research programs that recognize the significance of space flight as a scientific research tool for advancing knowledge of life on Earth, and that utilize each flight opportunity to its fullest. For the first time in history, gravity can be almost completely eliminated. Thus, studies can be undertaken that will help to elucidate the importance of gravity to the normal functioning of living organisms, and to determine the effects microgravity may have on an organism. This workshop was convened to organize a plan for space research on animal gravity-sensing systems and the role that gravity plays in the development and normal functioning of these systems. Scientists working in the field of animal gravity-sensing systems use a wide variety of organisms in their research. The workshop presentations dealt with topics which ranged from the indirect gravity receptor of the water flea, Daphnia (whose antennal setae apparently act as current-sensing receptors as the animal moves up and down in water), through specialized statocyst structures found in jellyfish and gastropods, to the more complex vestibular systems that are characteristic of amphibians, avians, and mammals.

Corcoran, M. L. (editor)

1986-01-01

282

Communication Systems for Grid Integration of Renewable Energy Resources  

E-print Network

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 extremely important role in monitoring, operating, and protecting both renewable energy generators and power systems. In this paper, we review some communication technologies available for grid integration of renewable energy resources. Then, we present the communication systems used in a real renewable energy project, Bear Mountain Wind Farm (BMW) in British Columbia, Canada. In addition, we present the communication systems used in Photovoltaic Power Systems (PPS). Finally, we outline some research challenges and possible solutions about the communication systems for grid integration of renewable energy resources.

Yu, F Richard; Xiao, Weidong; Choudhury, Paul

2011-01-01

283

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

284

Online and Offline Algorithmic Techniques for Communication Performance Optimization in Distributed Systems  

E-print Network

Online and Offline Algorithmic Techniques for Communication Performance Optimization in Distributed of communication optimization in distributed systems. Communication is a key issue in every distributed system and, since good communication performance is often difficult to achieve, optimization techniques are welcome

Paris-Sud XI, Université de

285

Accountable Anonymous Service Usage in Mobile Communication Systems \\Lambda  

E-print Network

Accountable Anonymous Service Usage in Mobile Communication Systems \\Lambda Levente Butty Abstract We introduce a model that allows of anonymous yet accountable service usage in mo­ bile communication systems. This model is based on the introduction of a new business role, called the customer care

Bencsáth, Boldizsár

286

Multifunction personal and mobile SMM antenna for satellite communications systems  

Microsoft Academic Search

There are a number of personal and mobile communications systems based on the use of microwave links relayed by Earth-orbiting satellites between small, low-cost Earth terminals using antennas of low directivity and broad beam aiming at the appropriate satellites. These satellite communications systems are now either deployed or in various stages of development and planning. For example, there are the

J. J. H. Wang; J. K. Tillery

1997-01-01

287

Response to a Community-Based Information and Communication System.  

ERIC Educational Resources Information Center

A study investigated the introduction of an experimental school-centered and neighborhood-oriented communication system in a small midwestern town. It was anticipated that normal parent-teacher-school communication would be enhanced by the electronic messaging potential of the system. Researchers observed the entire adoption process from the…

Trachtman, Leon E.; And Others

288

Live, Audio-Visual Communication Systems for Distance Learning  

E-print Network

of the experience of managers, tutors and learners who have used live, audio-visual communication systemsLive, Audio-Visual Communication Systems for Distance Learning: Experience, Heuristics and ISDN, WC1H 0AP, U.K. tel: (44) (0)71 387 7050 ext. 5315 fax: (44) (0)71 580 1100 #12;Submission Live, Audio-Visual

Finkelstein, Anthony

289

Key Technologies for IMT-Advanced Mobile Communication Systems  

E-print Network

Key Technologies for IMT-Advanced Mobile Communication Systems Carl WIJTING1 , Klaus DOPPLER1 and assessment of key technologies for IMT-Advanced mobile communication systems. WINNER has devised an OFDMA- Advanced technology proposals has been issued by the International Telecommunication Union (ITU) [2

290

A System for Inter-Library Communication (SILC).  

National Technical Information Service (NTIS)

A study was made of the use of time-sharing computer systems as a means of communication, accounting, message switching, and referral in a System for Inter-Library Communication (SILC). The purpose of the study was to develop data on which to evaluate the...

R. M. Hayes

1973-01-01

291

Bioluminescent system for dynamic imaging of cell and animal behavior  

SciTech Connect

Highlights: Black-Right-Pointing-Pointer We combined a yellow variant of GFP and firefly luciferase to make ffLuc-cp156. Black-Right-Pointing-Pointer ffLuc-cp156 showed improved photon yield in cultured cells and transgenic mice. Black-Right-Pointing-Pointer ffLuc-cp156 enabled video-rate bioluminescence imaging of freely-moving animals. Black-Right-Pointing-Pointer ffLuc-cp156 mice enabled tracking real-time drug delivery in conscious animals. -- Abstract: The current utility of bioluminescence imaging is constrained by a low photon yield that limits temporal sensitivity. Here, we describe an imaging method that uses a chemiluminescent/fluorescent protein, ffLuc-cp156, which consists of a yellow variant of Aequorea GFP and firefly luciferase. We report an improvement in photon yield by over three orders of magnitude over current bioluminescent systems. We imaged cellular movement at high resolution including neuronal growth cones and microglial cell protrusions. Transgenic ffLuc-cp156 mice enabled video-rate bioluminescence imaging of freely moving animals, which may provide a reliable assay for drug distribution in behaving animals for pre-clinical studies.

Hara-Miyauchi, Chikako [Department of Physiology, Keio University School of Medicine, Tokyo 160-8582 (Japan) [Department of Physiology, Keio University School of Medicine, Tokyo 160-8582 (Japan); Laboratory for Cell Function Dynamics, Brain Science Institute, RIKEN, Saitama 351-0198 (Japan); Department of Biophysics and Biochemistry, Graduate School of Health Care Sciences, Tokyo Medical and Dental University, Tokyo 113-8510 (Japan); Tsuji, Osahiko [Department of Physiology, Keio University School of Medicine, Tokyo 160-8582 (Japan) [Department of Physiology, Keio University School of Medicine, Tokyo 160-8582 (Japan); Department of Orthopedic Surgery, Keio University School of Medicine, Tokyo 160-8582 (Japan); Hanyu, Aki [Division of Biochemistry, The Cancer Institute of the Japanese Foundation for Cancer Research, Tokyo 135-8550 (Japan)] [Division of Biochemistry, The Cancer Institute of the Japanese Foundation for Cancer Research, Tokyo 135-8550 (Japan); Okada, Seiji [Department of Advanced Medical Initiatives, Faculty of Medical Sciences, Kyushu University, Fukuoka 812-8582 (Japan)] [Department of Advanced Medical Initiatives, Faculty of Medical Sciences, Kyushu University, Fukuoka 812-8582 (Japan); Yasuda, Akimasa [Department of Physiology, Keio University School of Medicine, Tokyo 160-8582 (Japan) [Department of Physiology, Keio University School of Medicine, Tokyo 160-8582 (Japan); Department of Orthopedic Surgery, Keio University School of Medicine, Tokyo 160-8582 (Japan); Fukano, Takashi [Laboratory for Cell Function Dynamics, Brain Science Institute, RIKEN, Saitama 351-0198 (Japan)] [Laboratory for Cell Function Dynamics, Brain Science Institute, RIKEN, Saitama 351-0198 (Japan); Akazawa, Chihiro [Department of Biophysics and Biochemistry, Graduate School of Health Care Sciences, Tokyo Medical and Dental University, Tokyo 113-8510 (Japan)] [Department of Biophysics and Biochemistry, Graduate School of Health Care Sciences, Tokyo Medical and Dental University, Tokyo 113-8510 (Japan); Nakamura, Masaya [Department of Orthopedic Surgery, Keio University School of Medicine, Tokyo 160-8582 (Japan)] [Department of Orthopedic Surgery, Keio University School of Medicine, Tokyo 160-8582 (Japan); Imamura, Takeshi [Department of Molecular Medicine for Pathogenesis, Ehime University Graduate School of Medicine, Toon, Ehime 791-0295 (Japan) [Department of Molecular Medicine for Pathogenesis, Ehime University Graduate School of Medicine, Toon, Ehime 791-0295 (Japan); Core Research for Evolutional Science and Technology, The Japan Science and Technology Corporation, Tokyo 135-8550 (Japan); Matsuzaki, Yumi [Department of Physiology, Keio University School of Medicine, Tokyo 160-8582 (Japan)] [Department of Physiology, Keio University School of Medicine, Tokyo 160-8582 (Japan); Okano, Hirotaka James, E-mail: hjokano@jikei.ac.jp [Department of Physiology, Keio University School of Medicine, Tokyo 160-8582 (Japan); Division of Regenerative Medicine Jikei University School of Medicine, Tokyo 150-8461 (Japan); and others

2012-03-09

292

a System Design and Analysis for Satellite Communication Link  

NASA Astrophysics Data System (ADS)

A satellite RF communication link is analyzed based on a simple fundamental equations by systematic approach in this paper. The number of variables related to a design and analysis of satellite RF link is often a dozen or more, thus it is a tedious and time-consuming task. With the given input data, the important parameters are calculated step by step and three communication characteristics such as communication channel capacity, carrier-to-noise ratio (CNR) at the satellite and ground station are analyzed. It gives very useful information to the system engineers for designing and analyzing the overall satellite communication system in the conceptual design phase.

Chung, Tae-Jin; Eun, Jong-Won

2000-12-01

293

A wireless diabetes management and communication system.  

PubMed

Current diabetes management requires the collection of a large volume of data by the patient for analysis by his or her provider. There are numerous practical and technical barriers to doing this effectively and efficiently. In addition, the calculation of the correct insulin dose is complex because it requires considering anticipated carbohydrate consumption and exercise in addition to the current blood glucose level. A Diabetes Management and Communication System (DMCS) has been developed using a Compaq iPAQ Pocket PC with a Sprint PCS wireless AirCard. This system circumvents the problem of multiple proprietary programs for each brand of meter and permits the accurate determination of the proper insulin dose. Privacy is maintained by using only the iPAQ serial number as the patient identifier with access to the website protected by unique patient and provider passwords. The iPAQ was programmed with formulas that included: insulin sensitivity factor, current glucose level, amount of carbohydrates, appropriate carbohydrate:insulin ratio for that meal, and duration/intensity of exercise. Once the information is entered, an insulin dose is calculated, although an alternative dose can be selected. The data are downloaded to http://www.HealthSentry.net, where they are displayed in both tabular and graphic form. The patient may view the glucose data in both tabular and graphic form on the iPAQ. Thus a DMCS has been developed to assist patients and providers in improving glycemic control. A proof-of-concept study is underway to determine the effectiveness of the DMCS in patients with Type 1 diabetes mellitus who are currently using insulin pumps. PMID:14511424

Vigersky, Robert A; Hanson, Eric; McDonough, Edward; Rapp, Timothy; Pajak, John; Galen, Robert S

2003-01-01

294

An optical system for line-of-sight communication  

E-print Network

We design and implement a system for short and medium range directional two-way wireless communication. The system uses infrared radiation to transmit and receive voice data digitally. We utilize narrow angle infrared light ...

Mehta, Agustya R

2009-01-01

295

Specifying and Verifying Systems of Communicating Agents  

E-print Network

]. This approach can be contrasted with the mentalistic approach, which describes the semantics of communication of all the allowed action sequences by means of finite state diagrams, as in a behavioral approach

Giordano, Laura

296

Communication architecture based power management for battery efficient system design  

Microsoft Academic Search

Communication-based power management (CBPM) is a new battery-driven system-level power management methodology in which the system-level communication architecture regulates the execution of various system components, with the aim of improving battery efficiency, and hence, battery life. Unlike conventional power management policies (that attempt to efficiently shut down idle components), CBPM may delay the execution of selected system components even when

Kanishka Lahiri; Sujit Dey; Anand Raghunathan

2002-01-01

297

System integration: Development of a global network communication protocol  

Microsoft Academic Search

In the era of globalization and standardization, in the perspective of industrial system integration, the implementation of a network framework able to interconnect any type of device and supporting both real-time (RT) and time-uncritical communication is becoming a must. This paper proposes an original entirely software-based communication framework to support RT communication over standard Ethernet, and compares it with the

Sarah Cosentino; Massimiliano Zecca

2010-01-01

298

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

299

Neuropathic Pain in Animal Models of Nervous System Autoimmune Diseases  

PubMed Central

Neuropathic pain is a frequent chronic presentation in autoimmune diseases of the nervous system, such as multiple sclerosis (MS) and Guillain-Barre syndrome (GBS), causing significant individual disablement and suffering. Animal models of experimental autoimmune encephalomyelitis (EAE) and experimental autoimmune neuritis (EAN) mimic many aspects of MS and GBS, respectively, and are well suited to study the pathophysiology of these autoimmune diseases. However, while much attention has been devoted to curative options, research into neuropathic pain mechanisms and relief has been somewhat lacking. Recent studies have demonstrated a variety of sensory abnormalities in different EAE and EAN models, which enable investigations of behavioural changes, underlying mechanisms, and potential pharmacotherapies for neuropathic pain associated with these diseases. This review examines the symptoms, mechanisms, and clinical therapeutic options in these conditions and highlights the value of EAE and EAN animal models for the study of neuropathic pain in MS and GBS. PMID:23737643

Tian, David H.; Perera, Chamini J.; Moalem-Taylor, Gila

2013-01-01

300

Research Summary Assessing and communicating animal disease risks for countryside users  

E-print Network

initially on Lyme disease, an infection caused by a spiral bacteria Borrelia burgdorferi that is found methods mpropose a communication strategy, identifying the various audiences that need information an understanding of public users' and land owners/managers' perception of risk, identifying possible responses

301

Space-based laser systems for inter-satellite communications  

NASA Astrophysics Data System (ADS)

Space-based optical communications using satellites in low earth orbit (LEO) and Geo synchronous orbits (GEO) hold great promise for the proposed Internet in the Sky network of the future. Building high speed communications network using optical links in space has proven to be an extremely complicated task and many such schemes were tried without success in the past. However in the last few years, there has been impressive progress made to bring the concept of space based laser systems for inter-satellite communications to fruition in civilian and government-non classified projects. Laser Communications High data rate, small antenna size, narrow beam divergence, and a narrow field of view are characteristics of laser communications that offer a number of potential advantages for system design. Also discussed are the laser based optical inter-satellite communication equipment which enables large capacity communication, and the advantage of their systems. Laser-based communications offer a viable alternative to established RF communications for inter-satellite links and other applications where high performance links are a necessity.

Kazemi, Alex A.; Panahi, Allen

2012-06-01

302

Communications system using a sharply bandlimited keying waveform  

NASA Astrophysics Data System (ADS)

It is the object of this invention to transform a communications sequence in a communications system into an analog signal which is spectrally confined to the band available for the transmission within a band limited communications channel without compromising communication accuracy. Another object of this invention is to improve spectral confinement thereby allowing closer channel spacing and better electromagnetic compatibility among radar, navigation, and communications systems. These and other objects are achieved by a communication system using sharply bandlimited signals for sampled data communications wherein a sharply bandlimited waveform is computed for each sample value in a sequence of data samples. Each waveform is centered at a sample point, is weighted by the corresponding data value, and is truncated outside an appropriate time interval. Resulting data-weighted waveforms are summed in the computer for all data samples of the sequence to be communicated, and the result is converted to analog form, up-converted to the desired carrier frequency, and transmitted. Because the signal spectrum is sharply bandlimited, communication channels may be spaced more closely, permitting more channels in the same frequency band.

Waters, William M.

1995-03-01

303

Satellite communications systems and technology. Volume 1; Analytic Chapters  

NASA Technical Reports Server (NTRS)

Volume 1 (Analytical Chapters) of the final report of the NASA/NSF Panel Satellite Communications Systems and Technology is presented. The panel surveyed advanced technology being developed for commercial use in the satellite communications field in Europe, Japan, and Russia. All aspects of satellite communications were considered, including fixed, broadcast, mobile, personal communications, navigation, low earth orbit, and small satellites. The focus of the study was on experimental and advanced technology being developed in R&D and demonstration programs rather than on today's production capabilities. The report focuses on commercial satellite technology, and does not review defense-related or other confidential satellite communications capabilities. The NASA/NSF panel concluded that the United States has lost its leading position in many critical satellite communications technologies. Although U.S. industry retains a leading position in today's marketplace for satellite communications systems and services, this position is largely founded on technologies and capabilities developed in the 1960s and 1970s. Because the United States is losing ground with respect to a wide range of technologies and systems that will be key to future communications markets, the market share of the U.S. satellite communications industry is at risk.

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

1993-01-01

304

Satellite communications systems and technology. Volume 1: Analytical chapters  

NASA Technical Reports Server (NTRS)

This is Volume 1 (Analytical Chapters) of the final report of the NASA/NSF Panel Satellite Communications Systems and Technology. The panel surveyed advanced technology being developed for commercial use in the satellite communications field in Europe, Japan, and Russia. All aspects of satellite communications were considered, including fixed, broadcast, mobile, personal communications, navigation, low earth orbit, and small satellites. The focus was on experimental and advanced technology being developed in R&D and demonstration programs rather than on today's production capabilities. Focus was on commercial satellite technology, and does not review defense-related or other confidential satellite communications capabilities. The NASA/NSF panel concluded that the United States has lost its leading position in many critical satellite communications technologies. Although U.S. industry retains a leading position in today's marketplace for satellite communications systems and services, this position is largely founded on technologies and capabilities developed in the 1960's and 1970's. Because the United States is losing ground with respect to a wide range of technologies and systems that will be key to future communications markets, the market share of the U.S. satellite communications industry is at risk.

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

1993-01-01

305

COMMUNICATION www.rsc.org/loc | Lab on a Chip Sub-cellular precision on-chip small-animal immobilization, multi-photon  

E-print Network

COMMUNICATION www.rsc.org/loc | Lab on a Chip Sub-cellular precision on-chip small-animal on the web 2nd April 2008 DOI: 10.1039/b804808h Techniques for stable, rapid and repeatable small-animal immobilization are necessary for high-throughput in vivo genetic/drug screens using cellular and sub

Yanik, Mehmet Fatih

306

Communication technology is integral to most aerospace systems. Communication satel-lites bring us live coverage of events from around the world, deep-space communication  

E-print Network

#12;Communication technology is integral to most aerospace systems. Communication satel- lites bring us live coverage of events from around the world, deep-space communication links offer vivid images from outer space, and aircraft rely on communications for com- mand and control. In many locations

Peraire, Jaime

307

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

2006-02-01

308

Limitation to Communication of Fermionic System in Accelerated Frame  

NASA Astrophysics Data System (ADS)

In this article, we investigate communication between an inertial observer and an accelerated observer, sharing fermionic system, when they use classical and quantum communication using single rail or dual rail encoding. The purpose of this work is to understand the limit to the communication between an inertial observer and an accelerated observer, with single rail or dual rail encoding of fermionic system. We observe that at the infinite acceleration, the coherent information of single(or double) rail quantum channel vanishes, but those of classical ones may have finite values. In addition, we see that even when considering a method beyond the single-mode approximation, for the communication between Alice and Bob, the dual rail entangled state seems to provide better information transfer than the single rail entangled state, when we take a fixed choice of the Unruh mode. Moreover, we find that the single-mode approximation may not be sufficient to analyze communication of fermionic system in an accelerated frame.

Chang, Jinho; Kwon, Younghun

2014-09-01

309

Most theories of animal communication emphasise the importance of conspicuousness in signal design. Effective  

E-print Network

Amphibolurus muricatus visual display reveal a different design: the introductory tail-flick has a lower video footage of a lizard tail-flick with those to a precisely matched 3-D animation (Experiment 1). We mediate recognition. Two follow-up studies assessed the importance of tail-flick amplitude (Experiment 3

Peters, Richard

310

Relating Communications Mode Choice and Teamwork Quality: Conversational versus Textual Communication in IT System and Software Development Teams  

ERIC Educational Resources Information Center

This cross-sectional study explored how IT system and software development team members communicated in the workplace and whether teams that used more verbal communication (and less text-based communication) experienced higher levels of collaboration as measured using the Teamwork Quality (TWQ) scale. Although computer-mediated communication tools…

Smith, James Robert

2012-01-01

311

Accent: A Communication Oriented Network Operating System Kernel  

Microsoft Academic Search

Accent is a communication oriented operating system kernel being built at Carnegie-Mellon University to support the distributed personal computing project, Spice, and the development of a fault-tolerant distributed sensor network (DSN). Accent is. built around a single, powerful abstraction of communication between processes, with all kernel functions, such as device access and virtual memory management accessible through messages and distributable

Richard F. Rashid; George G. Robertson

1981-01-01

312

An Experimental Study of the Emergence of Human Communication Systems  

Microsoft Academic Search

The emergence of human communication systems is typically investigated via 2 approaches with complementary strengths and weaknesses: naturalistic studies and computer simulations. This study was conducted with a method that combines these approaches. Pairs of participants played video games requiring communication. Members of a pair were physically separated but exchanged graphic signals through a medium that prevented the use of

Bruno Galantucci

2005-01-01

313

Emerging System for Affectively Charged Interpersonal Communication Alena Neviarouskaya1  

E-print Network

- 3376 - Emerging System for Affectively Charged Interpersonal Communication Alena Neviarouskaya1 Department of Information and Communication Engineering, University of Tokyo, Tokyo, Japan (Tel : +81@nii.ac.jp) 4 Graduate School of Media Design, Keio University, Tokyo, Japan (E-mail: tachi

Tachi, Susumu

314

H? control for networked systems with random communication delays  

Microsoft Academic Search

This note is concerned with a new controller design problem for networked systems with random communication delays. Two kinds of random delays are simultaneously considered: i) from the controller to the plant, and ii) from the sensor to the controller, via a limited bandwidth communication channel. The random delays are modeled as a linear function of the stochastic variable satisfying

Fuwen Yang; Zidong Wang; Y. S. Hung; Mahbub Gani

2006-01-01

315

Survey on the Future Aeronautical Communication System and its development  

E-print Network

1 Survey on the Future Aeronautical Communication System and its development for continental for the evolution of the aeronautical com- munication infrastructure. Motivated by studies that estimate a growth to the future aeronautical scenario (air-air communication, traffic optimization...). This project is entitled

Paris-Sud XI, Université de

316

Secure electronic commerce communication system based on CA  

NASA Astrophysics Data System (ADS)

In this paper, we introduce the situation of electronic commercial security, then we analyze the working process and security for SSL protocol. At last, we propose a secure electronic commerce communication system based on CA. The system provide secure services such as encryption, integer, peer authentication and non-repudiation for application layer communication software of browser clients' and web server. The system can implement automatic allocation and united management of key through setting up the CA in the network.

Chen, Deyun; Zhang, Junfeng; Pei, Shujun

2001-07-01

317

Effective Testing and Debugging Techniques for a Group Communication System  

Microsoft Academic Search

View-oriented group communication is an important and widely used building block for constructing highly- available fault-tolerant systems. Unfortunately, group- communication based systems are extremely hard to test and debug due to a number of stateful complex algorithms deployed in parallel and the unique combination of distrib- uted and concurrent programming paradigms that amplifies the non-determinism in the system behavior. In

Eitan Farchi; Gabriel Kliot; Yoel Krasny; Alex Krits; Roman Vitenberg

2005-01-01

318

Facility for the evaluation of space communications and related systems  

NASA Technical Reports Server (NTRS)

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 instrumentation, testbed hardware, and experiment control and monitor software for the evaluation of components, subsystems, systems, and networks. The ASC lab has capabilities to perform radiofrequency (RF), microwave, and millimeter-wave characterizations as well as measurements using low, medium, or high data rate digital signals. In addition to laboratory measurements, the ASC Lab also includes integrated satellite ground terminals allowing experimentation and measurements accessing operational satellites through real space links.

Kerczewski, Robert J.; Svoboda, James S.; Kachmar, Brian A.

1995-01-01

319

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

320

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

2012-06-30

321

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

322

MAge-AniM: a system for visual modeling of embodied agent animations and their replay on mobile devices  

Microsoft Academic Search

Embodied agents are employed in several applications (e.g. computer-based presentations, help systems, e-learning and training, sign language communication for the deaf), but the process of developing them is still complex (e.g., modeling animations is one of the difficult and time-consuming tasks). Moreover, although mobile devices have recently reached a performance level that allows them to manage 3D graphics, most embodied

Luca Chittaro; Fabio Buttussi; Daniele Nadalutti

2006-01-01

323

A New Remote-controlled Animal Robot Training System  

Microsoft Academic Search

This paper presents a new scatheless platform for training remote-controlled animal robot, which can be used to analyze the relations between electrical stimulation and animal behavior. It will not only provide a convenient platform and method to research the controllability of animal behavior and the possibility of training animal robots, but also open new possibilities for biomedical, artificial intelligence and

Yongling Wang; Kui Yuan; Jianfeng Li; Weiguo Song

2007-01-01

324

DIFAR PROCESSING IN UNDERWATER DSSS COMMUNICATION SYSTEMS  

Microsoft Academic Search

This paper presents a new approach to combat multiple access interference in underwater acoustic DSSS communications. The proposed technique employs directional frequency analysis and recording (DIFAR) sonobuoys, which is used in oceanography for surveillance of marine mammals. The solution offers an efficient alternative when compared with other techniques that use large linear hydrophone arrays. The proposed technique is particularly attractive

Juan Pons; Juan E. Cousseau; Stefan Werner

325

IEPLC Framework, Automated Communication in a Heterogeneous Control System Environment  

E-print Network

In CERN accelerators control system several components are essential such as: Programmable Logic Controller (PLC), PCI Extensions for Instrumentation (PXI), and other micro-controller families. Together with their weaknesses and their strength points they typically present custom communication protocols and it is therefore difficult to federate them into the control system using a single communication strategy. Furthermore this dependency to the physical device interfaces and protocols makes most of the code not reusable and the replacement of old technology a difficult problem. The purpose of IEPLC ([1]) is to mitigate the communication issues given by this heterogeneity; it proposes a framework to define communication interfaces in a hardware independent manner. In addition it automatically generates all the resources needed on master side (typically represented by a FEC: Front-End Computer) and slave side (typically represented by the controller) to implement a common and generic Ethernet communication. Th...

Locci, F

2014-01-01

326

Transmission Communication  

E-print Network

ELEC3028 Digital Transmission -- MODEM S Chen Digital Communication System . Purpose: communicate Communication System (continue) . A pair of transmitter (coder, modulator) and receiver (demodulator, decoder) is called transceiver . Information theory provides us basic communication theory for communication system

Chen, Sheng

327

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

Code of Federal Regulations, 2013 CFR

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

2013-01-01

328

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

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

2014-01-01

329

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

Code of Federal Regulations, 2012 CFR

...2012-01-01 false Protection of digital computer and communication systems and networks...Sites § 73.54 Protection of digital computer and communication systems and networks...shall provide high assurance that digital computer and communication systems and...

2012-01-01

330

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

Code of Federal Regulations, 2011 CFR

...2011-01-01 false Protection of digital computer and communication systems and networks...Sites § 73.54 Protection of digital computer and communication systems and networks...shall provide high assurance that digital computer and communication systems and...

2011-01-01

331

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

Code of Federal Regulations, 2010 CFR

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

2010-01-01

332

14 CFR 1221.108 - Establishment of the NASA Unified Visual Communications System.  

Code of Federal Regulations, 2010 CFR

...Establishment of the NASA Unified Visual Communications System. 1221.108 Section...the Agency's Unified Visual Communications System § 1221.108 Establishment of the NASA Unified Visual Communications System. (a) The NASA...

2010-01-01

333

Time and Frequency Synchronization in OFDM Communication Systems  

E-print Network

of each carrier. OFDM enables maximum loading, practically up to the capacity of every channel, equalized. Keywords: synchronization, cycle stationarity, blind evaluation. Introduction The technology of OFDM86 Time and Frequency Synchronization in OFDM Communication Systems Zdravko Nikolov, Georgi Horozov

Borissova, Daniela

334

21 CFR 892.2050 - Picture archiving and communications system.  

Code of Federal Regulations, 2012 CFR

... Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES RADIOLOGY DEVICES Diagnostic Devices § 892.2050 Picture archiving and communications system. (a)...

2012-04-01

335

21 CFR 892.2050 - Picture archiving and communications system.  

Code of Federal Regulations, 2013 CFR

... Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES RADIOLOGY DEVICES Diagnostic Devices § 892.2050 Picture archiving and communications system. (a)...

2013-04-01

336

Circuit-aware system design techniques for wireless communication  

E-print Network

When designing wireless communication systems, many hardware details are hidden from the algorithm designer, especially with analog hardware. While it is difficult for a designer to understand all aspects of a complex ...

Huang, Everest W. (Everest Wang)

2006-01-01

337

80. Survivable lowfrequency communications system receiver, teletypewriter set, radio, teleprinter, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

80. Survivable low-frequency communications system receiver, teletypewriter set, radio, teleprinter, south side - Ellsworth Air Force Base, Delta Flight, Launch Control Facility, County Road CS23A, North of Exit 127, Interior, Jackson County, SD

338

21 CFR 890.3710 - Powered communication system.  

...Examples of powered communication systems include the following: a specialized typewriter, a reading machine, and a video picture and word screen. (b) Classification. Class II (special controls). The device is exempt from the premarket...

2014-04-01

339

47 CFR 90.465 - Control of systems of communication.  

Code of Federal Regulations, 2012 CFR

(a) Depending on design considerations, control of a system of communication may be exercised in varying ways. In single frequency simplex, base/mobile operations, control may be exercised by the control operator at the fixed control...

2012-10-01

340

7. Survivable low frequency communication system pathway, looking east ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

7. Survivable low frequency communication system pathway, looking east - Ellsworth Air Force Base, Delta Flight, Launch Control Facility, County Road CS23A, North of Exit 127, Interior, Jackson County, SD

341

Predictive Compensation for Communication Outages in Networked Control Systems  

E-print Network

Predictive Compensation for Communication Outages in Networked Control Systems Erik Henriksson Henrik Sandberg Karl Henrik Johansson Abstract-- A predictive outage compensator co for Strategic Research. E. Henriksson, H. Sandberg and K. H. Johansson are with the AC- CESS Linnaeus Center

Johansson, Karl Henrik

342

Cultural selection drives the evolution of human communication systems  

PubMed Central

Human communication systems evolve culturally, but the evolutionary mechanisms that drive this evolution are not well understood. Against a baseline that communication variants spread in a population following neutral evolutionary dynamics (also known as drift models), we tested the role of two cultural selection models: coordination- and content-biased. We constructed a parametrized mixed probabilistic model of the spread of communicative variants in four 8-person laboratory micro-societies engaged in a simple communication game. We found that selectionist models, working in combination, explain the majority of the empirical data. The best-fitting parameter setting includes an egocentric bias and a content bias, suggesting that participants retained their own previously used communicative variants unless they encountered a superior (content-biased) variant, in which case it was adopted. This novel pattern of results suggests that (i) a theory of the cultural evolution of human communication systems must integrate selectionist models and (ii) human communication systems are functionally adaptive complex systems. PMID:24966310

Tamariz, Monica; Ellison, T. Mark; Barr, Dale J.; Fay, Nicolas

2014-01-01

343

A Wireless Broadband Integrated Services Communications System at 60 GHz  

Microsoft Academic Search

The paper presents a wireless integrated services communications system for indoor and campus use. Whereas most current indoor wireless systems are distinct solutions for different services, our network, WISCS, covers the entire range from low-rate mobiles to high-speed portables. The system employs a picocellular structure in the 60 GHz band to provide capacity demanded by broadband services. The system concept

V. Aue; G. Fettweis; A. Finger; E. Förster; J. Hübner; H. Kaluzni; K. Kojucharow; R. Lehnert; W. Nowak; H. Nuszkowski; F. Poegel; M. Riedel; M. Sauer; B. Stantchev; J. Voigt; J. Wagner; S. Zimmermann

1996-01-01

344

Communication integrity for slow-dynamic critical embedded systems  

E-print Network

systems. The critical property induces high safety requirements. It means the system is low fault tolerantCommunication integrity for slow-dynamic critical embedded systems Amira Zammali (1),(2) (1) CNRS codes and targets slow-dynamic critical embedded systems. The novelty of this approach lies in the fact

Paris-Sud XI, Université de

345

New inclined synchronous satellite system for mobile communications and radiodetermination  

Microsoft Academic Search

A new satellite system using inclined synchronous satellites is proposed. This system can provide radiodetermination services as well as communication services for mobile earth stations in the common satellite system. In this system, two or more satellites can be always observed at the same time from any mobile terminal on the earth (including the polar regions) with an elevation angle

Fumiaki Sugaya; Yutaka Yasuda; Yasuo Hirata

1988-01-01

346

Dreamweaver and Flash: Strategies for Updating Communication Systems Instruction  

ERIC Educational Resources Information Center

The rate of innovation and change impacting technology education communication systems instruction has been vigorous for longer than most people can remember. Trends have included analog systems being replaced by digital systems, integration of networks and system devices, computerization, optical storage, and wireless transmission of data. The…

Hill, Roger B.

2004-01-01

347

Providing ordered message delivery in communication network systems  

E-print Network

PROVIDING ORDERED MESSAGE DELIVERY IN COMMUNICATION NETWORK SYSTEMS A Thesis by JULI0 A. RIVERA-HERNANDEZ Submitted to the Oflice of Graduate Studies of Texas AkM University in partial fulfillment of the requirements for the degree of MASTER... OF SCIENCE May 1995 Major Subject: Computer Science PROVIDING ORDERED MESSAGE DELIVERY IN COMMUNICATION NETWORK SYSTEMS A Thesis by JULIO A. RIVERA-HERNANDEZ Submitted to Texas ARM University in partial fulfillment of the requirements for the degree...

Rivera-Hernandez, Julio A

2012-06-07

348

Communications protocol for RF-based indoor wireless localization systems  

Microsoft Academic Search

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

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

2006-01-01

349

Nonlinear filter based decision feedback equalizer for optical communication systems.  

PubMed

Nonlinear impairments in optical communication system have become a major concern of optical engineers. In this paper, we demonstrate that utilizing a nonlinear filter based Decision Feedback Equalizer (DFE) with error detection capability can deliver a better performance compared with the conventional linear filter based DFE. The proposed algorithms are tested in simulation using a coherent 100 Gb/sec 16-QAM optical communication system in a legacy optical network setting. PMID:24718240

Han, Xiaoqi; Cheng, Chi-Hao

2014-04-01

350

Design and performance evaluation of a communication protocol for an information communication processing system  

Microsoft Academic Search

The problem of how to manage communication networks and network construction systems that are diverse and complex is discussed. The authors consider the necessity of network management systems which can supply information users with enhanced information services as well as monitoring and controlling network resources. The International Standard Organization (ISO) and ITU-T have been actively executing special studies on the

Won Ryu; Jae-Ho You; Dong-Won Kim; Tae-Joon Kim; Byeong-Nam Yoon

1994-01-01

351

Laser Communication Demonstration System (LCDS) and future mobile satellite services  

NASA Technical Reports Server (NTRS)

The Laser Communications Demonstration System (LCDS) is a proposed in-orbit demonstration of high data rate laser communications technology conceived jointly by NASA and U.S. industry. The program objectives are to stimulate industry development and to demonstrate the readiness of high data rate optical communications in Earth orbit. For future global satellite communication systems using intersatellite links, laser communications technology can offer reduced mass and power requirements and higher channel bandwidths without regulatory constraints. As currently envisioned, LCDS will consist of one or two orbiting laser communications terminals capable of demonstrating high data rate (greater than 750Mbps) transmission in a dynamic space environment. Two study teams led by Motorola and Ball Aerospace are currently in the process of conducting a Phase A/B mission definition study of LCDS under contracts with JPL/NASA. The studies consist of future application survey, concept and requirements definition, and a point design of the laser communications flight demonstration. It is planned that a single demonstration system will be developed based on the study results. The Phase A/B study is expected to be completed by the coming June, and the current results of the study are presented in this paper.

Chen, Chien-Chung; Wilhelm, Michael D.; Lesh, James R.

1995-01-01

352

Methods for operating parallel computing systems employing sequenced communications  

DOEpatents

A parallel computing system and method 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 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.

Benner, Robert E. (Albuquerque, NM); Gustafson, John L. (Albuquerque, NM); Montry, Gary R. (Albuquerque, NM)

1999-01-01

353

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

354

Study and design of laser communications system for space shuttle  

NASA Technical Reports Server (NTRS)

The design, development and operation are described of the laser communications system developed for potential space shuttle application. A brief study was conducted to identify the need, if any, for narrow bandwidth space-to-space communication on the shuttle vehicles. None have been specifically identified that could not be accommodated with existing equipments. The key technical features developed in this hardware are the conically scanned tracker for optimized track while communicating with a single detector, and the utilization of a common optical carrier frequency for both transmission and detection. This latter feature permits a multiple access capability so that several transceivers can communicate with one another. The conically scanned tracker technique allows the received signal energy to be efficiently divided between the tracking and communications functions within a common detector.

1973-01-01

355

A systems engineering initiative for NASA's space communications  

NASA Technical Reports Server (NTRS)

In addition to but separate from the Red and Blue Teams commissioned by the NASA Administrator, NASA's Associate Administrator for Space Communications commissioned a Blue Team to review the Office of Space Communications (Code O) Core Program and determine how the program could be conducted faster, better, and cheaper, without compromising safety. Since there was no corresponding Red Team for the Code O Blue Team, the Blue Team assumed a Red Team independent attitude and challenged the status quo. The Blue Team process and results are summarized. The Associate Administrator for Space Communications subsequently convened a special management session to discuss the significance and implications of the Blue Team's report and to lay the groundwork and teamwork for the next steps, including the transition from engineering systems to systems engineering. The methodology and progress toward realizing the Code O Family vision and accomplishing the systems engineering initiative for NASA's space communications are presented.

Hornstein, Rhoda S.; Hei, Donald J., Jr.; Kelly, Angelita C.; Lightfoot, Patricia C.; Bell, Holland T.; Cureton-Snead, Izeller E.; Hurd, William J.; Scales, Charles H.

1993-01-01

356

Consumer Attitudes Towards the Development of Animal-Friendly Husbandry Systems  

Microsoft Academic Search

Recent policy developments in the area of livestock husbandry have suggested that, from the perspective of optimizing animal welfare, new animal husbandry systems should be developed that provide opportunities for livestock animals to be raised in environments where they are permitted to engage in “natural behavior.” It is not known whether consumers regard animal husbandry issues as important, and whether

L. J. Frewer; A. P. W. Kole; S. M. A. Van de Kroon; C. de Lauwere

2005-01-01

357

Integrated source and channel encoded digital communication system design study  

NASA Technical Reports Server (NTRS)

The particular Ku-band carrier, PN despreading, and symbol synchronization strategies, which were selected for implementation in the Ku-band transponder aboard the orbiter, were assessed and evaluated from a systems performance viewpoint, verifying that system specifications were met. A study was performed of the design and implementation of tracking techniques which are suitable for incorporation into the Orbiter Ku-band communication system. Emphasis was placed on maximizing tracking accuracy and communication system flexibility while minimizing cost, weight, and system complexity of Orbiter and ground systems hardware. The payload communication study assessed the design and performance of the forward link and return link bent-pipe relay modes for attached and detached payloads. As part of this study, a design for a forward link bent-pipe was proposed which employs a residual carrier but which is tracked by the existing Costas loop.

Alem, W. K.; Huth, G. K.; Simon, M. K.

1978-01-01

358

Effect of latrogenic trauma on the bone scintigram: an animal study. Concise communication. [Rabbits  

SciTech Connect

An animal study was performed to assess the effect on the Tc-99m phosphate bone scintigram of injury by needle aspiration or drill hole to metaphyseal and diaphyseal areas in immature and mature bones. Results showed that in 12 immature rabbits such trauma to metaphyseal regions had no effect on the bone image. Similar metaphyseal trauma in two mature dogs showed definite abnormalities on the bone image, but in one mature rabbit, no abnormality could be identified by scintigram. Diaphyseal trauma always gave a definitely abnormal bone image. Extrapolation of these results to humans should be cautious, but it suggests that needling or drilling in metaphyseal regions in neonates or young children probably does not affect later bone images.

Alazraki, N.; Moitoza, J.; Heaphy, J.; Taylor, A. Jr.

1984-09-01

359

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. PMID:18465970

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

2008-01-01

360

International Journal of Vehicle Information and Communication Systems (IJVICS)  

E-print Network

International Journal of Vehicle Information and Communication Systems (IJVICS) Volume 1 - Issue 3 of a vehicle over wires to a traffic control center. Within the automotive telematics industry, currently all commercialized traffic information systems are centralized systems, either integrated within an in-vehicle

Detwiler, Russell

361

29 CFR 1915.85 - Vessel radar and communication systems.  

(b) The employer shall secure each vessel's radar and communication system so it is incapable of energizing or emitting radiation before any employee begins work: (1) On or in the vicinity of the system; (2) On or in the vicinity of a system equipped with a dummy load;...

2014-07-01

362

29 CFR 1915.85 - Vessel radar and communication systems.  

Code of Federal Regulations, 2013 CFR

(b) The employer shall secure each vessel's radar and communication system so it is incapable of energizing or emitting radiation before any employee begins work: (1) On or in the vicinity of the system; (2) On or in the vicinity of a system equipped with a dummy load;...

2013-07-01

363

Event storm detection and identification in communication systems  

Microsoft Academic Search

Event storms are the manifestation of an important class of abnormal behaviors in communication systems. They occur when a large number of nodes throughout the system generate a set of events within a small period of time. It is essential for network management systems to detect every event storm and identify its cause, in order to prevent and repair potential

Mouayad Albaghdadi; Bruce Briley; Martha Evens

2006-01-01

364

Use of low orbital satellite communications systems for humanitarian programs  

NASA Technical Reports Server (NTRS)

Communication and information exchange play a decisive role in progress and social development. However, in many parts of the world the communication infrastructure is inadequate and the capacity for on-line exchange of information may not exist. This is true of underdeveloped countries, remote and relatively inaccessible regions, sites of natural disasters, and of all cases where the resources needed to create complex communication systems are limited. The creation of an inexpensive space communications system to service such areas is therefore a high priority task. In addition to a relatively low-cost space segment, an inexpensive space communications systems requires a large number of ground terminals, which must be relatively inexpensive, energy efficient (using power generated by storage batteries, or solar arrays, etc.), small in size, and must not require highly expert maintenance. The ground terminals must be portable, and readily deployable. Communications satellites in geostationary orbit at altitudes of about 36,000 km are very expensive and require complex and expensive ground stations and launch vehicles. Given current technology, it is categorically impossible to develop inexpensive satellite systems with portable ground terminals using such satellites. To solve the problem of developing an inexpensive satellite communications system that can operate with relatively small ground stations, including portable terminals, we propose to use a system with satellites in low Earth orbit, at an altitude of 900-1500 km. Because low orbital satellites are much closer to the Earth than geostationary ones and require vastly less energy expenditure by the satellite and ground terminals for transmission of messages, a system using them is relatively inexpensive. Such a system could use portable ground terminals no more complex than ordinary mobile police radios.

Vlasov, Vladimir N.; Gorkovoy, Vladimir

1991-01-01

365

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

366

High speed laser communication network for satellite systems  

NASA Astrophysics Data System (ADS)

Using optical links in space and building high speed laser communications network has proven to be an extremely complicated task and many such schemes were tried without success in the past. However, in the last few years, there has been impressive progress made to bring the concept to fruition in civilian and government-non classified projects. In this paper we will focus on the requirements of the space-based lasers and optics used for beam forming, as well as receiver antenna gain and detectors used in free space communications. High data rate, small antenna size, narrow beam divergence, and a narrow field of view are characteristics of laser communications that offer a number of potential advantages for system design. Space-based optical communications using satellites in low earth orbit (LEO) and Geo-synchronous orbits (GEO) hold great promise for the proposed Internet in the Sky network of the future. Also discussed are the critical parameters in the transmitter, channel, receiver, and link budget that are employed in successful inter-satellite communications system. We cover that Laser Communications offer a viable alternative to established RF communications for inter-satellite links and other applications where high performance links are a necessity.

Panahi, Allen; Kazemi, Alex A.

2011-06-01

367

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

368

Exploiting Reconfigurable Antennas in Communication Systems with Delay-Sensitive Applications  

E-print Network

Wireless communication systems continue to face the challenge of time varying quality of the underlying communication channel. When a slow fading channel goes into a deep fade, the corresponding communication system might face successive decoding...

Hammad, Eman

2012-02-14

369

26 CFR 49.4253-9 - Exemption for certain interior communication systems.  

Code of Federal Regulations, 2011 CFR

... Exemption for certain interior communication systems. 49.4253-9 Section...FACILITIES AND SERVICES EXCISE TAXES Communications § 49.4253-9 Exemption for certain interior communication systems. (a) In...

2011-04-01

370

26 CFR 49.4253-9 - Exemption for certain interior communication systems.  

Code of Federal Regulations, 2010 CFR

... Exemption for certain interior communication systems. 49.4253-9 Section...FACILITIES AND SERVICES EXCISE TAXES Communications § 49.4253-9 Exemption for certain interior communication systems. (a) In...

2010-04-01

371

Swiss Federal Institute of Technology, Lausanne (EPFL) School of Computer and Communication Systems (I&C)  

E-print Network

Swiss Federal Institute of Technology, Lausanne (EPFL) School of Computer and Communication Systems (I&C) Graduate School in Communication Systems 2001-2002 Analyzing RBP, a Total Order Broadcast....................................................................................................6 3.1.1 Reliable Communication and Reliable Broadcast

Paris-Sud XI, Université de

372

Gigabit optical wireless communication system for indoor applications  

NASA Astrophysics Data System (ADS)

In this paper a novel high bandwidth optical wireless communication system for indoor personal area networking applications with both ubiquitous coverage and mobility feature is proposed and tradeoffs are studied. Gigabit-per-second optical wireless communication system with limited mobility provided to users has been demonstrated by proof-of- concept experiments for the first time. It has also been shown that when incorporating with the WiFi-based localization system, our proposed system can provide high-speed error-free operation with mobility over the entire room.

Wang, Ke; Nirmalathas, Ampalavanapillai; Lim, Christina; Skafidas, Efstratios

2010-12-01

373

Communications Solutions for Heterogeneous Systems Based on SOA  

NASA Astrophysics Data System (ADS)

In order to address the gaps which widely used in business application architecture and problems of heterogeneous system communication, this paper provides a standardized framework of SOA, built in the application of a loose coupling between systems “server + proxy” data exchange platform, to achieve heterogeneous data exchange and data sharing, and developed a business based on Web services platform, making full use of the Web service, which makes the system has good scalability and maintainability, to solve the problem of heterogeneous system communication and widely used to make up for the current architecture lack of business applications.

Wei, Xianmin

374

Integrated source and channel encoded digital communications system design study  

NASA Technical Reports Server (NTRS)

Studies on the digital communication system for the direct communication links from ground to space shuttle and the links involving the Tracking and Data Relay Satellite (TDRS). Three main tasks were performed:(1) Channel encoding/decoding parameter optimization for forward and reverse TDRS links,(2)integration of command encoding/decoding and channel encoding/decoding; and (3) modulation coding interface study. The general communication environment is presented to provide the necessary background for the tasks and to provide an understanding of the implications of the results of the studies.

Huth, G. K.

1974-01-01

375

Communications  

NASA Technical Reports Server (NTRS)

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. Effective communication between the several programs, NASA Headquarters, and NASA field centers also is required. Further, communication among the above program elements, industry, local and state government, and the public also are necessary for meeting program objectives.

Stouffer, Donald D.

1990-01-01

376

Communications.  

ERIC Educational Resources Information Center

This manual, prepared by a distributive education (DE) class at Delaware State College, was designed for use by DE teacher-coordinators who teach communication skills. Included are lessons, activities, and resource materials relating to the following communication skills: functional speaking, written communication, telephone etiquette, customer…

Grandfield, Raymond J., Ed.

377

Simulation of ultra wide-band communication systems  

Microsoft Academic Search

The objective is to present and analyse the UWB communication systems signal processing point of view on the receiver side, with the purpose of using the technology for wireless high data-rate short range communication. The simulation was to use the tedious Monte-Carlo simulation to match the semi-analytic experiment shown in the original paper (M.Z. Win and R.A. Scholtz, 1998). This

S. H. Chen; P. Shum; E. H. Chua

2005-01-01

378

MLCD: Overview of NASA's Mars Laser Communications Demonstration System  

Microsoft Academic Search

NASA is presently overseeing a project to create the world's first free-space laser communications system that can be operated over a range much larger than the near-earth ranges that have been demonstrated to date. To be flown on the Mars Telecom Orbiter, planned for launch by NASA in 2009, it will demonstrate high-rate laser communications from Mars orbit to one

D. M. Boroson; A. Biswas; B. L. Edwards

379

Queueing models of picture archiving and communication systems  

NASA Astrophysics Data System (ADS)

At present the management of radiological information is done manually in most hospitals. Images from the digital modalities (e.g. Computer- tomography scanners, X-ray machines) are converted into films and stored in a room. These films are then distributed manually and interpretation is done by reading the films through light boxes. With the advances in semiconductor technology and digital processing techniques it is now possible to automate these operations by using a digital system for archiving and communication of images. A Picture Archiving and Communication System (PACS), is a digital system for acquiring, storing, moving and displaying picture or image information .These systems are highly dependent on the new technology for mass storage of data on optical disks. In the medical environment, the ultimate goal of using digital images and PACS is tohave a radiology department without filmjackets 2,3 A typical PACS consists of a database of medical images, display stations, acquisition systems and the communications medium. There are two possible architectures for PACS, one is the distributed PACS where all the modules are linked together through a high speed communication medium, and the other is a centralized PACS where the acquisition nodes and the display stations are part of the system which comprises the image database 4. In this paper we present analytical queueing models of distributed PACS used in the medical environments. These models are for the image database, the picture viewing stations, and the communication channels.

Khanmoradi, Hassan; Nilsson, Arne A.

1990-08-01

380

Animation of multi-flexible body systems and its use in control system design  

NASA Technical Reports Server (NTRS)

Animation can greatly assist the structural dynamicist and control system analyst with better understanding of how multi-flexible body systems behave. For multi-flexible body systems, the structural characteristics (mode frequencies, mode shapes, and damping) change, sometimes dramatically with large angles of rotation between bodies. With computer animation, the analyst can visualize these changes and how the system responds to active control forces and torques. A characterization of the type of system we wish to animate is presented. The lack of clear understanding of the above effects was a key element leading to the development of a multi-flexible body animation software package. The resulting animation software is described in some detail here, followed by its application to the control system analyst. Other applications of this software can be determined on an individual need basis. A number of software products are currently available that make the high-speed rendering of rigid body mechanical system simulation possible. However, such options are not available for use in rendering flexible body mechanical system simulations. The desire for a high-speed flexible body visualization tool led to the development of the Flexible Or Rigid Mechanical System (FORMS) software. This software was developed at the Center for Simulation and Design Optimization of Mechanical Systems at the University of Iowa. FORMS provides interactive high-speed rendering of flexible and/or rigid body mechanical system simulations, and combines geometry and motion information to produce animated output. FORMS is designed to be both portable and flexible, and supports a number of different user interfaces and graphical display devices. Additional features have been added to FORMS that allow special visualization results related to the nature of the flexible body geometric representations.

Juengst, Carl; Stahlberg, Ron

1993-01-01

381

Market Related System Analysis of Satellite Communication Networks  

NASA Astrophysics Data System (ADS)

The report is devoted to the technique of effectiveness analysis of communication space system with satellites in geostationary orbit using market models. The technique is worked out in order to choose the most optimal alternative of communication space system design. The alternative considered optimal and the system effective when the maximum profit from the system with limited system costs is achieved. The key point of the technique is a wide use of market models and application of market related parameters as an integral part of the design technique in order to secure the high commercial output of the communication space system. A range of models for decisive characteristics of communication space system is synthesized in terms of the technique. Flexible market model with detailed insight into the structure of the given market sector and its trends is created. The technique enables to choose the image and key parameters of the future system such as payload and ground sector characteristics so as to make the system most cost-effective and profitable. It is shown that such factors as the choice of launch vehicle can influence the system effectiveness rather dramatically. In particular, it is shown that under certain conditions delivering the small (five hundred kg) satellite to the geostationary orbit with the help of light-weight launch vehicle and the satellite's own electro-rocket thrusters is forty per cent more cost- effective than when the satellite is delivered with the help of the medium-size launch vehicle. The latter case can lead to the significant losses due to high launch costs that are nearly two times higher for the medium size launch vehicle than for the light launce vehicle. The technique is applicable both for designing a wide range of communication space systems and is recommended for those dealing with designing commercial systems. It can also be used to update and improve the systems that are already in operation.

Malyshev, V. V.; Panasenkova, M. V.

2002-01-01

382

Computer-aided communication satellite system analysis and optimization  

NASA Technical Reports Server (NTRS)

The capabilities and limitations of the various published computer programs for fixed/broadcast communication satellite system synthesis and optimization are discussed. A satellite Telecommunication analysis and Modeling Program (STAMP) for costing and sensitivity analysis work in application of communication satellites to educational development is given. The modifications made to STAMP include: extension of the six beam capability to eight; addition of generation of multiple beams from a single reflector system with an array of feeds; an improved system costing to reflect the time value of money, growth in earth terminal population with time, and to account for various measures of system reliability; inclusion of a model for scintillation at microwave frequencies in the communication link loss model; and, an updated technological environment.

Stagl, T. W.; Morgan, N. H.; Morley, R. E.; Singh, J. P.

1973-01-01

383

Communications satellite systems operations with the space station, volume 2  

NASA Technical Reports Server (NTRS)

A financial model was developed which described quantitatively the economics of the space segment of communication satellite systems. The model describes the economics of the space system throughout the lifetime of the satellite. The expected state-of-the-art status of communications satellite systems and operations beginning service in 1995 were assessed and described. New or enhanced space-based activities and associated satellite system designs that have the potential to achieve future communications satellite operations in geostationary orbit with improved economic performance were postulated and defined. Three scenarios using combinations of space-based activities were analyzed: a spin stabilized satellite, a three axis satellite, and assembly at the Space Station and GEO servicing. Functional and technical requirements placed on the Space Station by the scenarios were detailed. Requirements on the satellite were also listed.

Price, K.; Dixon, J.; Weyandt, C.

1987-01-01

384

Data link communications in the National Airspace System  

NASA Technical Reports Server (NTRS)

In the near future, conventional radio communications, currently the primary medium for the transfer of information between aircraft and ground stations, will be replaced by digital data link. This paper briefly describes this technology and summarizes what are believed to be the principal human factor issues associated with data link implementation in the airspace system. Integration of data link communications with existing systems on the flight deck and in the Air Traffic Control system is discussed with regard for both near term implementation and longer term operational issues.

Lee, Alfred T.

1989-01-01

385

Applications of a global small animal tracking system Songbird movements as an example  

E-print Network

biologists may find a global small-animal tracking system helpful in testing, validating and expanding181 Applications of a global small animal tracking system Songbird movements as an example Imagine, 1989). Queleas can migrate long distances, sometimes more Tracking animals over large temporal

Thorup, Kasper

386

A Fast full-body fluorescence/bioluminescence imaging system for small animals  

E-print Network

A Fast full-body fluorescence/bioluminescence imaging system for small animals Jong Hwan Lee, USA 10032 ABSTRACT Whole body in vivo optical imaging of small animals has widened its applications image entire surface of a target animal simultaneously. This system uses double mirror reflection scheme

Hielscher, Andreas

387

5 Traditional Communication Architectures Existing multiprocessor systems do not provide a communication architecture in the sense that they do  

E-print Network

107 5 Traditional Communication Architectures Existing multiprocessor systems do not provide, efficiency, and incrementality. These traditional low-level communication layers are not well suited) traditional communication models, not just one. To the high-level language implementor it means more optimiza

von Eicken, Thorsten

388

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

Microsoft Academic Search

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

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

2008-01-01

389

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

390

Faults, errors and failures in communications: a systems theory perspective on organisational structure  

Microsoft Academic Search

Abstract communications systems theory may be a valuable tool for the description, prediction and control of organizations. An organization is conceptualized as an abstract system of inter-human communications; humans are the main organization 'communication units' which produce and receive communications (but humans are not part of the abstract system). Organization systems tend to grow in complexity, enabling a more complete

Peter Andras; Bruce Charlton

391

NOTE ON ANTENNA DESIGN IN UWB WIRELESS COMMUNICATION SYSTEMS  

E-print Network

-wideband (UWB) radio has a long history from the 1960s, in radar and communication appli- cations [1 antenna shares the same history with UWB radio since it is an indispensable component in UWB systems.Y.W. Chia1 1 Department of Radio Systems, Institute for Infocomm Research 20 Science Park Road, #02

Arslan, Hüseyin

392

Analysis of submarine cable and communication satellite systems reliabilities  

Microsoft Academic Search

The performance of AT&T's overseas message telephone circuits for the years 1970-1975 was the basis for ana analysis of the reliability of submarine cables and communication satellite systems. Data presented in 24 tables is devided into three categories: (1) over cable and satellite system outage statistics for each of the six years and the six year average, (2) detailed cable

G. S. Li

1977-01-01

393

Unmanned Aircraft Systems for Communication and Atmospheric Sensing Missions  

E-print Network

Unmanned Aircraft Systems for Communication and Atmospheric Sensing Missions Eric W. Frew, Brian Argrow, Dale Lawrence, Jack Elston, and Maciej Stachura, Research and Engineering Center for Unmanned and Engineer- ing Center for Unmanned Vehicles Heterogeneous Unmanned Aircraft System. The unmanned aircraft

Frew, Eric W.

394

Kansas Communication and Instruction System through Fiber-Optic Transmission.  

ERIC Educational Resources Information Center

Schools and communities will restructure as they move into the next decade. The success of this restructuring will be dependent upon access to and sharing of quality teaching and information through an expanded communication system. One of the major two-way interactive technologies is the fiber-optic cable: a delivery system that will provide…

Kansas State Dept. of Education, Topeka.

395

Computer-Aided Communication Satellite System Analysis and Optimization.  

ERIC Educational Resources Information Center

Various published computer programs for fixed/broadcast communication satellite system synthesis and optimization are discussed. The rationale for selecting General Dynamics/Convair's Satellite Telecommunication Analysis and Modeling Program (STAMP) in modified form to aid in the system costing and sensitivity analysis work in the Program on…

Stagl, Thomas W.; And Others

396

Use of adaptive filtering for noise reduction in communications systems  

Microsoft Academic Search

This article deals with noise reduction in modern communication systems. Primarily it focuses on cases where conventional filtering techniques based on linear filtering fail. It is modern based approach to adaptive filtering. The article presents a comprehensive hardware and software solutions to the adaptive system using the two main leaders of adaptive LMS (least mean square) and RLS (recursive least

Radek Martinek; J. Zidek

2010-01-01

397

PLANNING AND DEVELOPMENT OF INDONESIA'S DOMESTIC COMMUNICATIONS SATELLITE SYSTEM PALAPA  

Microsoft Academic Search

On that thirty-first anniversary of Indonesian independence, the country's PALAPA domestic communication satellite system was inaugurated by President Suharto. This occasion made Indonesia the first developing country to acquire its own domestic satellite. This article aims to trace back the decision making process that led Indonesia to acquire its domestic satellite system, far ahead of other developing countries, i.e., six

Marwah Daud Ibrahim

398

New binocular vision system for human-robot communications  

Microsoft Academic Search

Concerns artificial vision for human-robot communications. This paper reported on a new binocular stereovision system to solve the problems of virtual images and occlusion. It introduced the principle of the rotation disparity mechanism, the theoretical principle of detecting and canceling virtual images, and the concept of a technique to detect occlusion. An experimental prototype system was introduced to demonstrate these

J. Takeno; Zichuan Xu

1999-01-01

399

Systems and methods for free space optical communication  

DOEpatents

Free space optical communication methods and systems, according to various aspects are described. The methods and systems are characterized by transmission of data through free space with a digitized optical signal acquired using wavelength modulation, and by discrimination between bit states in the digitized optical signal using a spectroscopic absorption feature of a chemical substance.

Harper, Warren W [Benton City, WA; Aker, Pamela M [Richland, WA; Pratt, Richard M [Richland, WA

2011-05-10

400

A queuing model for meteor burst packet communication systems  

Microsoft Academic Search

A discrete-time queuing model for the performance of a meteor-burst packet communication system is analyzed using matrix analytic methods. Not only is the system subject to interruptions due to the intermittence of the ionization layer, but its analysis is further complicated by the necessity to retransmit packets that have error or that occur at the tail end of a period

Y. Chandramouli; M. F. Neuts; V. Ramaswami

1989-01-01

401

Channel simulation for direct detection optical communication systems  

NASA Technical Reports Server (NTRS)

A technique is described for simulating the random modulation imposed by atmospheric scintillation and transmitter pointing jitter on a direct detection optical communication system. The system is capable of providing signal fading statistics which obey log normal, beta, Rayleigh, Ricean or chi-squared density functions. Experimental tests of the performance of the Channel Simulator are presented.

Tycz, M.; Fitzmaurice, M. W.

1974-01-01

402

Channel simulation for direct-detection optical communication systems  

NASA Technical Reports Server (NTRS)

A technique is described for simulating the random modulation imposed by atmospheric scintillation and transmitter pointing jitter on a direct-detection optical communication system. The system is capable of providing signal fading statistics which obey log-normal, beta, Rayleigh, Ricean, or chi-square density functions. Experimental tests of the performance of the channel simulator are presented.

Tycz, M.; Fitzmaurice, M. W.

1974-01-01

403

Unmanned Aircraft System Control and ATC Communications Bandwidth Requirements  

NASA Technical Reports Server (NTRS)

There are significant activities taking place to establish the procedures and requirements for safe and routine operation of unmanned aircraft systems (UAS) in the National Airspace System (NAS). Among the barriers to overcome in achieving this goal is the lack of sufficient frequency spectrum necessary for the UAS control and air traffic control (ATC) communications links. This shortcoming is compounded by the fact that the UAS control communications links will likely be required to operate in protected frequency spectrum, just as ATC communications links are, because they relate to "safety and regularity of flight." To support future International Telecommunications Union (ITU) World Radio Conference (WRC) agenda items concerning new frequency allocations for UAS communications links, and to augment the Future Communications Study (FCS) Technology Evaluation Group efforts, NASA Glenn Research Center has sponsored a task to estimate the UAS control and ATC communications bandwidth requirements for safe, reliable, and routine operation of UAS in the NAS. This report describes the process and results of that task. The study focused on long-term bandwidth requirements for UAS approximately through 2030.

Henriksen, Steve

2008-01-01

404

Fast massive preventive security and information communication systems  

NASA Astrophysics Data System (ADS)

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

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

2008-04-01

405

Potential markets for a satellite-based mobile communications system  

NASA Technical Reports Server (NTRS)

The objective of the study was to define the market needs for improved land mobile communications systems. Within the context of this objective, the following goals were set: (1) characterize the present mobile communications industry; (2) determine the market for an improved system for mobile communications; and (3) define the system requirements as seen from the potential customer's viewpoint. The scope of the study was defined by the following parameters: (1) markets were confined to U.S. and Canada; (2) range of operation generally exceeded 20 miles, but this was not restrictive; (3) the classes of potential users considered included all private sector users, and non-military public sector users; (4) the time span examined was 1975 to 1985; and (5) highly localized users were generally excluded - e.g., taxicabs, and local paging.

Jamieson, W. M.; Peet, C. S.; Bengston, R. J.

1976-01-01

406

Communicating from the edge of the solar system  

NASA Technical Reports Server (NTRS)

Communication technology for deep-space scientific missions is surveyed, with a focus on systems being developed for Galileo, a NASA orbiter/probe mission to Jupiter. The problems faced in designing the links from the probe (descending into the Jovian atmosphere) to the orbiter and from the orbiter to earth are examined; the technological solutions adopted for Galileo are discussed; the expansion of the Deep Space Network for the mission is described; the advantages and limitations of cm-band communication systems being considered to meet the data-rate requirements of future deep-space missions are outlined; and the potential of optical communication for the 21st century is indicated. Also included are tables listing past and planned deep-space missions and a brief description of the use of spacecraft radio signals by radio and planetary scientists to probe solar-system plasmas and gravitational fields.

Posner, E. C.; Horttor, R. L.; Grant, T. L.

1986-01-01

407

MUAN: A Stop Motion Animation System Margareth Catoia Varela1  

E-print Network

: the Development of Animation Animation is the art of creating movement through a series of fixed images. Although the basic explanation for the whole cinematic phenomenon (including film and television). Plateau is American James Stuart Blackton, who did his first experiences using stop-motion. In "The Haunted Hotel

408

Development of A General Principle Solution Forisoagrinet Compliant Networking System Components in Animal Husbandry  

NASA Astrophysics Data System (ADS)

In pig production software and electronic systems are widely used for process control and management. Unfortunately most devices on farms are proprietary solutions and autonomically working. To unify data communication of devices in agricultural husbandry, the international standard ISOagriNET (ISO 17532:2007) was developed. It defines data formats and exchange protocols, to link up devices like climate controls, feeding systems and sensors, but also management software. The aim of the research project, "Information and Data Collection in Livestock Systems" is to develop an ISOagriNET compliant IT system, a so called Farming Cell. It integrates all electronic components to acquire the available data and information for pig fattening. That way, an additional benefit to humans, animals and the environment regarding process control and documentation, can be generated. Developing the Farming Cell is very complex; in detail it is very difficult and long-winded to integrate hardware and software by various vendors into an ISOagriNET compliant IT system. This ISOagriNET prototype shows as a test environment the potential of this new standard.

Kuhlmann, Arne; Herd, Daniel; Rö?ler, Benjamin; Gallmann, Eva; Jungbluth, Thomas

409

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

410

Performance simulation in high altitude platforms (HAPs) communications systems  

NASA Astrophysics Data System (ADS)

This paper considers the analysis by simulation of a digital narrowband communication system for an scenario which consists of a High-Altitude aeronautical Platform (HAP) and fixed/mobile terrestrial transceivers. The aeronautical channel is modelled considering geometrical (angle of elevation vs. horizontal distance of the terrestrial reflectors) and statistical arguments and under these circumstances a serial concatenated coded digital transmission is analysed for several hypothesis related to radio-electric coverage areas. The results indicate a good feasibility for the communication system proposed and analysed.

Ulloa-Vásquez, Fernando; Delgado-Penin, J. A.

2002-07-01

411

An Isolated Working Heart System for Large Animal Models  

PubMed Central

Since its introduction in the late 19th century, the Langendorff isolated heart perfusion apparatus, and the subsequent development of the working heart model, have been invaluable tools for studying cardiovascular function and disease1-15. Although the Langendorff heart preparation can be used for any mammalian heart, most studies involving this apparatus use small animal models (e.g., mouse, rat, and rabbit) due to the increased complexity of systems for larger mammals1,3,11. One major difficulty is ensuring a constant coronary perfusion pressure over a range of different heart sizes – a key component of any experiment utilizing this device1,11. By replacing the classic hydrostatic afterload column with a centrifugal pump, the Langendorff working heart apparatus described below allows for easy adjustment and tight regulation of perfusion pressures, meaning the same set-up can be used for various species or heart sizes. Furthermore, this configuration can also seamlessly switch between constant pressure or constant flow during reperfusion, depending on the user’s preferences. The open nature of this setup, despite making temperature regulation more difficult than other designs, allows for easy collection of effluent and ventricular pressure-volume data. PMID:24962492

Schechter, Matthew A.; Southerland, Kevin W.; Feger, Bryan J.; Linder, Dean; Ali, Ayyaz A.; Njoroge, Linda; Milano, Carmelo A.; Bowles, Dawn E.

2014-01-01

412

ROBUS-2: A Fault-Tolerant Broadcast Communication System  

NASA Technical Reports Server (NTRS)

The Reliable Optical Bus (ROBUS) is the core communication system of the Scalable Processor-Independent Design for Enhanced Reliability (SPIDER), a general-purpose fault-tolerant integrated modular architecture currently under development at NASA Langley Research Center. The ROBUS is a time-division multiple access (TDMA) broadcast communication system with medium access control by means of time-indexed communication schedule. ROBUS-2 is a developmental version of the ROBUS providing guaranteed fault-tolerant services to the attached processing elements (PEs), in the presence of a bounded number of faults. These services include message broadcast (Byzantine Agreement), dynamic communication schedule update, clock synchronization, and distributed diagnosis (group membership). The ROBUS also features fault-tolerant startup and restart capabilities. ROBUS-2 is tolerant to internal as well as PE faults, and incorporates a dynamic self-reconfiguration capability driven by the internal diagnostic system. This version of the ROBUS is intended for laboratory experimentation and demonstrations of the capability to reintegrate failed nodes, dynamically update the communication schedule, and tolerate and recover from correlated transient faults.

Torres-Pomales, Wilfredo; Malekpour, Mahyar R.; Miner, Paul S.

2005-01-01

413

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

414

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

415

Integrated communication and control systems. I - Analysis  

NASA Technical Reports Server (NTRS)

The paper presents the results of an ICCS analysis focusing on discrete-time control systems subject to time-varying delays. The present analytical technique is applicable to integrated dynamic systems such as those encountered in advanced aircraft, spacecraft, and the real-time control of robots and machine tools via a high-speed network within an autonomous manufacturing environment. The significance of data latency and missynchronization between individual system components in ICCS networks is discussed in view of the time-varying delays.

Halevi, Yoram; Ray, Asok

1988-01-01

416

Reactive system verification case study: Fault-tolerant transputer communication  

NASA Technical Reports Server (NTRS)

A reactive program is one which engages in an ongoing interaction with its environment. A system which is controlled by an embedded reactive program is called a reactive system. Examples of reactive systems are aircraft flight management systems, bank automatic teller machine (ATM) networks, airline reservation systems, and computer operating systems. Reactive systems are often naturally modeled (for logical design purposes) as a composition of autonomous processes which progress concurrently and which communicate to share information and/or to coordinate activities. Formal (i.e., mathematical) frameworks for system verification are tools used to increase the users' confidence that a system design satisfies its specification. A framework for reactive system verification includes formal languages for system modeling and for behavior specification and decision procedures and/or proof-systems for verifying that the system model satisfies the system specifications. Using the Ostroff framework for reactive system verification, an approach to achieving fault-tolerant communication between transputers was shown to be effective. The key components of the design, the decoupler processes, may be viewed as discrete-event-controllers introduced to constrain system behavior such that system specifications are satisfied. The Ostroff framework was also effective. The expressiveness of the modeling language permitted construction of a faithful model of the transputer network. The relevant specifications were readily expressed in the specification language. The set of decision procedures provided was adequate to verify the specifications of interest. The need for improved support for system behavior visualization is emphasized.

Crane, D. Francis; Hamory, Philip J.

1993-01-01

417

Intelligent fault isolation and diagnosis for communication satellite systems  

NASA Technical Reports Server (NTRS)

Discussed here is a prototype diagnosis expert system to provide the Advanced Communication Technology Satellite (ACTS) System with autonomous diagnosis capability. The system, the Fault Isolation and Diagnosis EXpert (FIDEX) system, is a frame-based system that uses hierarchical structures to represent such items as the satellite's subsystems, components, sensors, and fault states. This overall frame architecture integrates the hierarchical structures into a lattice that provides a flexible representation scheme and facilitates system maintenance. FIDEX uses an inexact reasoning technique based on the incrementally acquired evidence approach developed by Shortliffe. The system is designed with a primitive learning ability through which it maintains a record of past diagnosis studies.

Tallo, Donald P.; Durkin, John; Petrik, Edward J.

1992-01-01

418

Statistical risk estimation for communication system design  

E-print Network

Spacecraft are complex systems that involve many subsystems and multiple relationships among them. The design of a spacecraft is an evolutionary process that starts from requirements and evolves over time. During this ...

Babuscia, Alessandra

2012-01-01

419

Specification for installation of the crew activity planning system coaxial cable communication system  

NASA Technical Reports Server (NTRS)

The specification used to install a broadband coaxial cable communication system to support remote terminal operations on the Crew Activity Planning system at the Lyndon B. Johnson Space Center are reported. The system supports high speed communications between a Harris Slash 8 computer and one or more Sanders Graphic 7 displays.

Allen, M. A.; Roman, G. S.

1979-01-01

420

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

421

Title: Digital Infrastructure: Reducing Energy Cost and Environmental Impacts of Information Processing and Communications Systems  

E-print Network

Title: Digital Infrastructure: Reducing Energy Cost and Environmental Impacts of Information Processing and Communications Systems Abstract: Creating a Sustainable Information and Communication Infrastructure Modern society's dependence on information and communication infrastructure (ICI) is so deeply

422

Automatic real-time pair-feeding system for animals  

NASA Technical Reports Server (NTRS)

A pair feeding method and apparatus are provided for experimental animals wherein the amount of food consumed is immediately delivered to a normal or control animal so that there is a qualitative, quantitative and chronological correctness in the pair feeding of the two animals. This feeding mechanism delivers precisely measured amounts of food to a feeder. Circuitry is provided between master and slave feeders so that there is virtually no chance of a malfunction of the feeding apparatus, causing erratic results. Recording equipment is also provided so that an hourly record is kept of food delivery.

Leon, H. A.; Connolly, J. P.; Hitchman, M. J.; Humbert, J. E. (inventors)

1974-01-01

423

A general analysis of anti-jam communication systems  

NASA Technical Reports Server (NTRS)

A general error bound is derived for a general anti-jam communication system which will serve as the basis for evaluating the performance of all such complex communication systems. The two most common spread spectrum techniques, coherent DS/BPSK and noncoherent FH/MFSK, are analyzed. Pulse jamming represents the worst type of jammer for DS/BPSK systems, and several receiver structures against such a jammer are examined. It is found that for low values of chip energy-to-noise ratios of O dB or less there is little difference between having or not having jammer state knowledge with a hard decision receiver. Soft decision receivers are shown to be useless against very narrow pulses without jammer state knowledge. Partial band jammers are close to the worst case jammer for FH/MFSK systems. The conclusions found for these systems are similar to those for the DS/BPSK systems.

Omura, J. K.; Levitt, B. K.

1981-01-01

424

A backup data network for power system automations based on satellite communication  

Microsoft Academic Search

Power system automations technologies are essential for power system operations and controls. A variety of communication systems including optical fiber, microwave and power line communications are used to transmit these EMS\\/SCADA data. In these communication modes, fiber communication is used to transmit IEC 101\\/104 protocol data in most power grids due to its large bandwidth and high reliability. However, fiber

Xingquan Xiao; Zhong Fu; Ge Liu; Chuang Deng

2010-01-01

425

Research on Application and RF EMC of Bidirectional Wireless Communication System in Nuclear Power Plant  

Microsoft Academic Search

The wireless communication means is necessary for routine work and emergency operating in nuclear power station. With the developments of wireless technical and nuclear power plant, wireless communication system requires more comprehensive and widespread application. The secure and stable bidirectional wireless communication system is to have an important status in plant communication systems. In certain regions of nuclear power plant,

Yao Yu; Bing Chen; Yi Luo

2011-01-01

426

Aeronautical Mobile Airport Communications System (AeroMACS)  

NASA Technical Reports Server (NTRS)

To help increase the capacity and efficiency of the nation s airports, a secure wideband wireless communications system is proposed for use on the airport surface. This paper provides an overview of the research and development process for the Aeronautical Mobile Airport Communications System (AeroMACS). AeroMACS is based on a specific commercial profile of the Institute of Electrical and Electronics Engineers (IEEE) 802.16 standard known as Wireless Worldwide Interoperability for Microwave Access or WiMAX (WiMax Forum). The paper includes background on the need for global interoperability in air/ground data communications, describes potential AeroMACS applications, addresses allocated frequency spectrum constraints, summarizes the international standardization process, and provides findings and recommendations from the world s first AeroMACS prototype implemented in Cleveland, Ohio, USA.

Budinger, James M.; Hall, Edward

2011-01-01

427

RESOLUTION: Reconfigurable Systems for Mobile Local Communication and Positioning  

Microsoft Academic Search

RESOLUTION aims at developing a wireless three-dimensional (3-D) local positioning system with measurement accuracy in the centimetre regime and real-time ability. A novel frequency modulated continuous wave (FMCW) radar principle with pulsed active reflector is employed. This High-Precision-Localisation-System (HPLS) will be implemented together with common WLAN systems that are used for data communication purposes. Due to its high data rate

Philippos Tragas; Antonis Kalis; Constantinos Papadias; Frank Ellinger; Ralf Eickhoff; Thomas Ussmuller; Ralf Mosshammer; Mario Huemer; Alexander Dabek; Dimosthenes Doumenis; Anastassios Kounoudes

2007-01-01

428

Optical communication system performance with tracking error induced signal fading.  

NASA Technical Reports Server (NTRS)

System performance is determined for an optical communication system using noncoherent detection in the presence of tracking error induced signal fading assuming (1) binary on-off modulation (OOK) with both fixed and adaptive threshold receivers, and (2) binary polarization modulation (BPM). BPM is shown to maintain its inherent 2- to 3-dB advantage over OOK when adaptive thresholding is used, and to have a substantially greater advantage when the OOK system is restricted to a fixed decision threshold.

Tycz, M.; Fitzmaurice, M. W.; Premo, D. A.

1973-01-01

429

Fault-tolerant control of process systems using communication networks  

Microsoft Academic Search

A methodology for the design of fault-tolerant control systems for chemical plants with distributed interconnected processing units is presented. Bringing together tools from Lyapunov-based nonlinear control and hybrid systems theory, the approach is based on a hierarchical architecture that integrates lower-level feedback control of the individual units with upper-level logic-based supervisory control over communication networks. The local control system for

Nael H. El-Farra; Adiwinata Gani; Panagiotis D. Christofides

2005-01-01

430

The Globalstar mobile satellite system for worldwide personal communications  

NASA Technical Reports Server (NTRS)

Loral Aerospace Corporation along with Qualcomm Inc. have developed a satellite system which offers global mobile voice and data services to and from handheld and mobile user terminals with omni-directional antennas. By combining the use of low-earth orbit (LEO) satellites with existing terrestrial communications systems and innovative, highly efficient spread spectrum techniques, the Globalstar system provides users with low-cost, reliable communications throughout the world. The Globalstar space segment consists of a constellation of 48 LEO satellites in circular orbits with 750 NM (1389 km) altitude. Each satellite communicates with the mobile users via the satellite-user links and with gateway stations. The gateway stations handle the interface between the Globalstar network and the OSTN/PLMN systems. Globalstar transceivers are similar to currently proposed digital cellular telephones in size and have a serial number that will allow the end user to make and receive calls from or to that device anywhere in the world. The Globalstar system is designed to operate as a complement to existing local, long-distance, public, private and specialized telecommunications networks. Service is primarily designed to serve the rural and thin route communications needs of consumers, government users, and private networks.

Wiedeman, Robert A.; Viterbi, Andrew J.

1993-01-01

431

A Low Earth Orbit satellite marine communication system demonstration  

NASA Technical Reports Server (NTRS)

An application of Low Earth Orbit (LEO) satellite communications technology was investigated during a joint Canadian/American scientific expedition to the north pole in the summer of 1994. The Canadian ice breaker involved, was equipped with a store-and-forward LEO satellite terminal which was linked to a ground station in St. John's, Newfoundland, via the near-polar-orbiting satellite, HealthSat-l. The objective was to evaluate the performance of such a system while providing an alternate means of communications in the far north. The system performed well, given its inherent limitations. All 151 attempts to send data files to the ship were successful. Only two (2) of the 35 attempts to send files from the ship were unsuccessful. The files ranged in size from 0.1 to 60 Kbytes. In the high arctic, above 80 deg north, this system often provided the only practical means of data communications. This experiment demonstrated the potential of such a system for not-real-time communications with remote and/or mobile stations, and highlighted the many issues involved. This paper describes the project objectives, system configuration and experimental procedure used, related technical issues, trial results, future work, and conclusions.

Elms, T. Keith; Butt, Kenneth A.; Asmus, Ken W.

1995-01-01

432

Corona Considerations in Submarine Cable Communications Systems  

Microsoft Academic Search

Underwater repeatered telephone cable systems are series powered by high-voltage dc. Each repeater and equalizer contains a power separation filter (PSF) for extracting the dc current from the center conductor of the coaxial cable while allowing signal transmission. Corona discharges occurring across the high-voltage components are coupled through reactive components to the repeater's terminals. Each of the experimentally observed pulse

Earnest Franke

1974-01-01

433

Impedance matching techniques for ethernet communication systems  

E-print Network

requirements for individual components within the Gigabit Ethernet port, such as the RJ45 magjack or the physical layer, the system can easily be out of tolerance for return loss error. A simple impedance matching circuit could match the CAT5 cable...

Kamprath, Richard Alan

2007-09-17

434

Communications of the Association for Information Systems  

E-print Network

systems and the media. It concerns a form of potential "bait and switch" advertising where a consumer a form of potential bait and switch advertising where a consumer, searching using the brand name of one as Keywords in Sponsored Search Advertising Mark A. Rosso Bernard J. Jansen School of Business, North

Jansen, James

435

EVALUATION FOR DARPA COMMUNICATOR SPOKEN DIALOGUE SYSTEMS  

Microsoft Academic Search

The overall objective of the DARPA COMMUNICATORproject is to support rapid, cost-effective development of multi-modal speech- enabled dialogue systems with advanced conversational capabilities, such as plan optimization, explanation and nego tiation. In order to make this a reality, we need to find methods for evaluating the contribution of various techniques to the users' willingne ss and ability to use the

Marilyn Walker; Lynette Hirschman; John Aberdeen

2000-01-01

436

A System for Interlibrary Communication (SILC).  

ERIC Educational Resources Information Center

The minutes of a meeting sponsored by the Association of Research Libraries (ARL) is presented. Thirty-one representatives, primarily from the library community, met at the Brookings Institution in Washington, D.C. on July 19, 1974, for an ARL-sponsored meeting to discuss a recently-completed feasibility study of a computer-based system for…

Association of Research Libraries, Washington, DC.

437

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

438

Solid state laser communications in space (SOLACOS) high data rate satellite communication system verification program  

NASA Astrophysics Data System (ADS)

This paper gives an overview on the current development status of the SOLACOS program and presents the highlights of the program. SOLACOS (Solid State Laser Communications in Space) is the national German program to develop a high performance laser communication system for high data rate transmission between LEO and GEO satellites (Inter Orbit Link, IOL). Two experimental demonstrator terminals are designed and developed in the SOLACOS program. The main development objectives are the Pointing Acquisition and Tracking subsystem (PAT) and the high data rate communication system. All key subsystems and components are straightway developed to be upgraded in follow- on projects to full space qualification. The main design objective for the system is a high degree of modularity which allows to easily upgrade the system with new upcoming technologies. Therefore, all main subsystems are interconnected via fibers to ease replacement of subsystems. The system implements an asymmetric data link with a 650 MBit/s return channel and a 10 MBit/s forward channel. The 650 MBit/s channel is based on a diode pumped Nd:YAG, Integrated Optics Modulator and uses the syncbit transmission scheme. In the syncbit system synchronization information which is necessary to maintain phase lock of the local oscillator of the coherent receiver is transmitted time multiplexed into the data stream. The PAT system comprises two beam detection sensors and three beam steering elements. For initial acquisition and tracking of the remote satellite a high speed CCD camera with an integrated image processing unit, the Acquisition and Tracking Sensor (ATS) is used. In the tacking mode the beam position is sensed via the Fibernutator sensor which is also used to couple the incoming signal into the receiver fiber. Incoming and outgoing beams are routed through the telescopes which are positioned with a 2 axis gimbal mechanism and a high speed beam steering mirror. The PAT system is controlled by a digital signal processor. For beam control advanced PAT algorithms are under development.

Pribil, Klaus; Flemmig, Joerg

1994-09-01

439

A distributed power generation communication system  

Microsoft Academic Search

A distributed power generation system (DPGS) consists of a number of small-scale power generation sources (SSPGS) that provide electric power at a site closer to the user than the central power generation station. Small-scale power generation technologies currently available include wind turbines, fuel cells, micro gas\\/diesel turbines, small hydro generators and photovoltaic panels. Currently, most SSPGSs are locally controlled and

Julian Meng

2003-01-01

440

The Business Communication Course and the Moodle Framework System  

ERIC Educational Resources Information Center

In this article I will argue that the use of learning content management systems is also justified in full-time education, especially in business education and communication studies. Nowadays not only multinational companies, but domestic medium enterprises also manage the training of new employees and existing staff with LCMSs. Companies in…

Krisko, Edina

2011-01-01

441

Information versus Communication in Course Management System Participation  

ERIC Educational Resources Information Center

Web resources in Latin American higher education institutions have been reported to show a much stronger emphasis on Information than on Communication. A Course Management System (CMS), according to Social Constructivism framework, is an opportunity for fostering learning through interaction in a virtual environment for learning; hence,…

Hamuy, Eduardo; Galaz, Mirtha

2010-01-01

442

Scattering Analysis for the Modeling of THz Communication Systems  

Microsoft Academic Search

Modeling propagation channels for future pico-cellular indoor THz communication systems requires the knowledge of the reflective properties of building materials. The reflectivity of smooth, optically thick materials can be modeled with Fresnel equations. In case of materials with a rough surface, diffuse scattering reduces the power reflected in the specular direction. Kirchhoff scattering theory can be employed to derive modified

Radoslaw Piesiewicz; Christian Jansen; Daniel Mittleman; Thomas Kleine-Ostmann; Martin Koch; Thomas Kurner

2007-01-01

443

New communication network protocol for a data acquisition system  

Microsoft Academic Search

An event builder based on communication networks has been used in high-energy physics experiments, and various networks have been adopted, for example, IEEE 802.3 (Ethernet), asynchronous transfer mode (ATM), and so on. In particular, Ethernet is widely used because its infrastructure is very cost effective. Many systems adopt standard protocols that are designed for a general network. However, in the

Tomohisa Uchida; Hirofumi Fujii; Yasushi Nagasaka; Manobu Tanaka

2006-01-01

444

Electronic Communication Systems and Social Networking Employee Social Media Policy  

E-print Network

Electronic Communication Systems and Social Networking Employee Social Media Policy The Fogelman impact. Beware of comments that could reflect poorly on you and the College. Social media sites/or bullying apply to content posted online. Violating any University policy while using social media could

Dasgupta, Dipankar

445

Emotions and Communication as a Dynamic Developmental System  

Microsoft Academic Search

This paper presents a qualitative case study of emotional development in the context of early mother-infant communication. Emotions and communi- cation are conceptualized as an integral part of a dynamic developmental system. The fundamental design principle employed is to isolate a key devel- opmental transition and then to closely examine micro- and macro-changes across that transition. In this study, the

Andrea Garvey; Alan Fogel

2008-01-01

446

46 CFR 169.713 - Engineroom communication system.  

Code of Federal Regulations, 2013 CFR

An efficient communication system must be provided between the principal steering station and the engineroom on vessels which are not equipped with pilothouse controls if, in the opinion of the Officer in Charge, Marine Inspection, this is necessary for proper operation of the...

2013-10-01

447

46 CFR 169.713 - Engineroom communication system.  

Code of Federal Regulations, 2010 CFR

An efficient communication system must be provided between the principal steering station and the engineroom on vessels which are not equipped with pilothouse controls if, in the opinion of the Officer in Charge, Marine Inspection, this is necessary for proper operation of the...

2010-10-01

448

46 CFR 169.713 - Engineroom communication system.  

Code of Federal Regulations, 2012 CFR

An efficient communication system must be provided between the principal steering station and the engineroom on vessels which are not equipped with pilothouse controls if, in the opinion of the Officer in Charge, Marine Inspection, this is necessary for proper operation of the...

2012-10-01

449

Understanding and Influencing the Informal Communication System in the University  

ERIC Educational Resources Information Center

The university grapevine is described as an informal communication system developed out of basic human needs of belonging, influencing, and being accepted by a group. This article discusses when and why it becomes most active in the institution, and how it can be controlled. (LBH)

Mandel, Jerry E.; Hellweg, Susan A.

1977-01-01

450

TD-LTE maritime trunking communication system based on TVWS  

NASA Astrophysics Data System (ADS)

This paper collects the measurement results of 470 MHZ-960MHZ spectrum in the coastal areas, and analyzes the characteristics of TV broadcast spectrum occupancy in the measurement region. Moreover, this article proposes construct the TD-LTE maritime trunking communication system using geolocation database, television database (TVDB) and cognitive radio (CR) technology.

Ren, Chunxiang; Chen, Xing; Li, Wanchao; Chen, Baodan

2014-10-01

451

RICE UNIVERSITY Rapid Prototyping of Wireless Communications Systems  

E-print Network

RICE UNIVERSITY Rapid Prototyping of Wireless Communications Systems by Bryan A. Jones A Thesis Aazhang J. S. Abercrobmie Professor of Electrical and Computer Engineering Don H. Johnson J. S to type-based theory, and for the fun of talking with a fellow cyclist. The RENE team at Rice is excellent

Cavallaro, Joseph R.

452

Channel Shortening for Bit Rate Maximization in DMT Communication Systems  

E-print Network

Channel Shortening for Bit Rate Maximization in DMT Communication Systems Karima Ragoubi, Maryline.ragoubi@insa-rennes.fr Abstract--This paper considers the problem of impulse re- sponse shortening for discrete multitone (DMT subscriber line (ADSL) and very high data rate digital subscriber line (VDSL) as described in [1]. In DMT

Paris-Sud XI, Université de

453

Compensating for Unreliable Communication Links in Networked Control Systems  

E-print Network

Compensating for Unreliable Communication Links in Networked Control Systems ERIK HENRIKSSON, Kungliga Tekniska högskolan, Osquldas väg 6, Stockholm. © Erik Henriksson, september 2009 Tryck main advisor Karl Henrik Johansson for taking me on as his Ph.D. student. Your enthusiasm is contagious

Johansson, Karl Henrik

454

Spectrally Efficient Modulation and Turbo Coding for Communication Systems  

E-print Network

Spectrally Efficient Modulation and Turbo Coding for Communication Systems Amer H. Alhabsi. · Modulation. · Turbo coding. · Spectral efficient modulation with TC. · Parity Assisted Decoding. · Summary encoder · It expands the data by adding redundancy. · Redundancy is added in a systematic fashion

Akl, Robert

455

Role of Communication Networks in Behavioral Systems Analysis  

ERIC Educational Resources Information Center

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

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

2009-01-01

456

Simulating channel losses in an underwater optical communication system.  

PubMed

A Monte Carlo numerical simulation for computing the received power for an underwater optical communication system is discussed and validated. Power loss between receiver and transmitter is simulated for a variety of receiver aperture sizes and fields of view. Additionally, pointing-and-tracking losses are simulated. PMID:24979623

Cox, William; Muth, John

2014-05-01

457

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.

458

Integrated source and channel encoded digital communication system design study  

NASA Technical Reports Server (NTRS)

Various aspects of space shuttle communication systems were studied. The following major areas were investigated: burst error correction for shuttle command channels; performance optimization and design considerations for Costas receivers with and without bandpass limiting; experimental techniques for measuring low level spectral components of microwave signals; and potential modulation and coding techniques for the Ku-band return link. Results are presented.

Huth, G. K.; Trumpis, B. D.; Udalov, S.

1975-01-01

459

Overlap Area Assisted Call Admission Control Scheme for Communications System  

Microsoft Academic Search

In this paper we propose a novel call admission control scheme named overlap area assisted new call blocking scheme (NCBS-OA) for High Altitude Platform (HAP) based communications systems, which utilizes both the geographical information and the overlap area to intelligently decide when to block a new call to help avoid possible handover failure. An approximate analytical model is derived to

Shufeng Li; David Grace; Yanchen Liu; Jibo Wei; Dongtang Ma

2011-01-01

460

A web-based flexible communication system in radiology.  

PubMed

A web-based system for rapid multidirectional communication has been created in the Radiology department at San Francisco General Hospital. The system allows messaging among radiology attendings, residents, and technologists, as well as other members of the hospital community, such as Emergency Department physicians and nurses. Instead of being tied to a particular workflow, this system provides a flexible communication infrastructure which can be easily adapted for different functions and user roles. The system has so far been configured to successfully support the standard "wet reading" workflow, to support marking and tracking of critical results, as well as multiple educational and quality improvement workflows. In the 19 months of operation, the system has gained over 1,800 users (virtually all providers at our institution), it has been accessed by radiologists over 39,000 times and by non-radiologists over 34,000 times. It has become an integral part of the radiology department operations and non-radiology clinical workflows. Unlike most existing softwares, our system is not a task-specific application, but a multipurpose communication system. It is able to effectively accommodate multiple workflows and user roles through configuration (without additional programming). This flexibility has helped this system to be rapidly and widely adopted within our enterprise. The extended reach of the system enables improved monitoring and documentation of workflows, helping with management decision making, and quality assurance. We report a successful radiology communication system based on the principles of flexibility and inclusiveness of users inside and outside the radiology department. PMID:21152949

Rybkin, Alexander Valentine; Wilson, Mark

2011-10-01

461

Payload system tradeoffs for mobile communications satellites  

NASA Technical Reports Server (NTRS)

System level trade-offs carried out during Mobile Satellite (M-SAT) design activities are described. These trade-offs relate to the use of low level beam forming, flexible power and spectrum distribution, and selection of the number of beams to cover the service area. It is shown that antenna performance can be improved by sharing horns between beams using a low level beam forming network (BFN). Additionally, greatly increased power utilization is possible using a hybrid matrix concept to share power between beams.

Moody, H. J.

1990-01-01

462

Conformal, Transparent Printed Antenna Developed for Communication and Navigation Systems  

NASA Technical Reports Server (NTRS)

Conformal, transparent printed antennas have advantages over conventional antennas in terms of space reuse and aesthetics. Because of their compactness and thin profile, these antennas can be mounted on video displays for efficient integration in communication systems such as palmtop computers, digital telephones, and flat-panel television displays. As an array of multiple elements, the antenna subsystem may save weight by reusing space (via vertical stacking) on photovoltaic arrays or on Earth-facing sensors. Also, the antenna could go unnoticed on automobile windshields or building windows, enabling satellite uplinks and downlinks or other emerging high-frequency communications.

Lee, Richard Q.; Simons, Rainee N.

1999-01-01

463

47 CFR 4.13 - Reports by the National Communications System (NCS) and by special offices and facilities, and...  

Code of Federal Regulations, 2010 CFR

...false Reports by the National Communications System (NCS) and by special...related responsibilities of communications providers. 4.13 Section...Telecommunication FEDERAL COMMUNICATIONS COMMISSION GENERAL...

2010-10-01

464

Internet-Based System for Voice Communication With the ISS  

NASA Technical Reports Server (NTRS)

The Internet Voice Distribution System (IVoDS) is a voice-communication system that comprises mainly computer hardware and software. The IVoDS was developed to supplement and eventually replace the Enhanced Voice Distribution System (EVoDS), which, heretofore, has constituted the terrestrial subsystem of a system for voice communications among crewmembers of the International Space Station (ISS), workers at the Payloads Operations Center at Marshall Space Flight Center, principal investigators at diverse locations who are responsible for specific payloads, and others. The IVoDS utilizes a communication infrastructure of NASA and NASArelated intranets in addition to, as its name suggests, the Internet. Whereas the EVoDS utilizes traditional circuitswitched telephony, the IVoDS is a packet-data system that utilizes a voice over Internet protocol (VOIP). Relative to the EVoDS, the IVoDS offers advantages of greater flexibility and lower cost for expansion and reconfiguration. The IVoDS is an extended version of a commercial Internet-based voice conferencing system that enables each user to participate in only one conference at a time. In the IVoDS, a user can receive audio from as many as eight conferences simultaneously while sending audio to one of them. The IVoDS also incorporates administrative controls, beyond those of the commercial system, that provide greater security and control of the capabilities and authorizations for talking and listening afforded to each user.

Chamberlain, James; Myers, Gerry; Clem, David; Speir, Terri

2005-01-01

465

Communication and control in an integrated manufacturing system  

NASA Technical Reports Server (NTRS)

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 Multi-Robot System (IMRS) was developed. The IMRS can be viewed as a distributed real time system. Some of the current research issues being examined to extend the framework of the IMRS to meet its performance goals are presented. These issues include the use of communication coprocessors to enhance performance, the distribution of tasks and the methods of providing fault tolerance in the IMRS. An application example of real time collision detection, as it relates to the IMRS concept, is also presented and discussed.

Shin, Kang G.; Throne, Robert D.; Muthuswamy, Yogesh K.

1987-01-01

466

Assessing and communicating animal  

E-print Network

provision University of Oxford, Department of Zoology Sarah Randolph, Andrew Dobson, Jenny Taylor Risk pleasure in spending time in the great outdoors and still more are being encouraged to visit green spaces the degree of risk and encourage preventative action. #12;Research team Forest Research and the Universities

467

Advanced Communications Technology Satellite (ACTS): Four-Year System Performance  

NASA Technical Reports Server (NTRS)

The Advanced Communications Technology Satellite (ACTS) was conceived at the National Aeronautics and Space Administration (NASA) in the late 1970's as a follow-on program to ATS and CTS to continue NASA's long history of satellite communications projects. The ACTS project set the stage for the C-band satellites that started the industry, and later the ACTS project established the use of Ku-band for video distribution and direct-to-home broadcasting. ACTS, launched in September 1993 from the space shuttle, created a revolution in satellite system architecture by using digital communications techniques employing key technologies such as a fast hopping multibeam antenna, an on-board baseband processor, a wide-band microwave switch matrix, adaptive rain fade compensation, and the use of 900 MHz transponders operating at Ka-band frequencies. This paper describes the lessons learned in each of the key ACTS technology areas, as well as in the propagation investigations.

Acosta, Roberto J.; Bauer, Robert; Krawczyk, Richard J.; Reinhart, Richard C.; Zernic, Michael J.; Gargione, Frank

1999-01-01

468

Shuttle/payload communications and data systems interface analysis  

NASA Technical Reports Server (NTRS)

The payload/orbiter functional command signal flow and telemetry signal flow are discussed. Functional descriptions of the various orbiter communication/avionic equipment involved in processing a command to a payload either from the ground through the orbiter by the payload specialist on the orbiter are included. Functional descriptions of the various orbiter communication/avionic equipment involved in processing telemetry data by the orbiter and transmitting the processed data to the ground are presented. The results of the attached payload/orbiter single processing and data handling system evaluation are described. The causes of the majority of attached payload/orbiter interface problems are delineated. A refined set of required flux density values for a detached payload to communicate with the orbiter is presented.

Huth, G. K.

1980-01-01

469

Communicating with Virtual Humans.  

ERIC Educational Resources Information Center

The face is a small part of a human, but it plays an essential role in communication. An open hybrid system for facial animation is presented. It encapsulates a considerable amount of information regarding facial models, movements, expressions, emotions, and speech. The complex description of facial animation can be handled better by assigning…

Thalmann, Nadia Magnenat

470

Software-Implemented Fault Tolerance in Communications Systems  

NASA Technical Reports Server (NTRS)

Software-implemented fault tolerance (SIFT) is used in many computer-based command, control, and communications (C(3)) systems to provide the nearly continuous availability that they require. In the communications subsystem of Space Station Alpha, SIFT algorithms are used to detect and recover from failures in the data and command link between the Station and its ground support. The paper presents a review of these algorithms and discusses how such techniques can be applied to similar systems found in applications such as manufacturing control, military communications, and programmable devices such as pacemakers. With support from the Tracking and Communication Division of NASA's Johnson Space Center, researchers at the University of Wyoming are developing a testbed for evaluating the effectiveness of these algorithms prior to their deployment. This testbed will be capable of simulating a variety of C(3) system failures and recording the response of the Space Station SIFT algorithms to these failures. The design of this testbed and the applicability of the approach in other environments is described.

Gantenbein, Rex E.

1994-01-01

471

47 CFR 11.47 - Optional use of other communications methods and systems.  

Code of Federal Regulations, 2012 CFR

...methods and systems. 11.47 Section 11.47 Telecommunication FEDERAL COMMUNICATIONS COMMISSION GENERAL EMERGENCY ALERT SYSTEM (EAS) Organization § 11.47 Optional use of other communications methods and systems. (a)...

2012-10-01

472

47 CFR 11.47 - Optional use of other communications methods and systems.  

Code of Federal Regulations, 2011 CFR

...methods and systems. 11.47 Section 11.47 Telecommunication FEDERAL COMMUNICATIONS COMMISSION GENERAL EMERGENCY ALERT SYSTEM (EAS) Organization § 11.47 Optional use of other communications methods and systems. (a)...

2011-10-01

473

47 CFR 11.47 - Optional use of other communications methods and systems.  

Code of Federal Regulations, 2013 CFR

...methods and systems. 11.47 Section 11.47 Telecommunication FEDERAL COMMUNICATIONS COMMISSION GENERAL EMERGENCY ALERT SYSTEM (EAS) Organization § 11.47 Optional use of other communications methods and systems. (a)...

2013-10-01

474

47 CFR 11.47 - Optional use of other communications methods and systems.  

Code of Federal Regulations, 2010 CFR

...methods and systems. 11.47 Section 11.47 Telecommunication FEDERAL COMMUNICATIONS COMMISSION GENERAL EMERGENCY ALERT SYSTEM (EAS) Organization § 11.47 Optional use of other communications methods and systems. (a)...

2010-10-01

475

Challenge for Full Control of Polarization in Optical Communication Systems  

NASA Astrophysics Data System (ADS)

Countermeasures against the receiver sensitivity degradation due to the state of polarization change in single-mode fibers in coherent optical communication systems are reviewed from early efforts in 1980s to the latest research results. It is pointed out that the polarization-diversity schemes are considered to be the most promising solutions among various countermeasures for the future applications owing to its applicability to the systems with analogue as well as digital signal processing.

Ryu, Shiro

476

Evaluation of communications management in a decentralized target tracking system  

NASA Astrophysics Data System (ADS)

Communication management is discussed in the context of a decentralized target tracking system, based on a simulated aircraft scenario. An intelligent algorithm, motivated by information theory, is generally found to outperform a simple non-intelligent algorithm. These results depend, for example, on the maneuverability of the targets that are being tracked. They are indicative of the performance trade- offs (e.g. tracking accuracy vs. numerical processing load) that will be required in the design of future decentralized tracking systems.

Deaves, Rob H.; Nicholson, David; Greenway, Phil

1997-07-01

477

Experimental evaluation of subcarrier modulation in chaotic optical communication systems.  

PubMed

Data streams with bit rates of up to 1 Gbit/s have been applied though the subcarrier modulation technique in an experimentally deployed optical communication system based on chaos data encryption and have been recovered efficiently. By shifting the spectral components of the encrypted data in regions where the chaotic carrier is powerful, a more efficient encryption and final message recovery is recorded with respect to the baseband modulation technique, improving the up-to-date performance of analogous systems. PMID:20081967

Argyris, A; Bogris, A; Hamacher, M; Syvridis, D

2010-01-15

478

Constructing social systems through computer-mediated communication  

Microsoft Academic Search

The question of whether computer-mediated communication can support the formation of genuine social systems is addressed in this paper. Our hypothesis, that technology creates new forms of social systems beyond real-life milieus, includes the idea that the technology itself may influence how social binding emerges within online environments. In real-life communities, a precondition for social coherence is the existence of

Barbara Becker; Gloria Mark

1999-01-01

479

Hybrid power system for remote communications stations. Master's thesis  

SciTech Connect

Distress Network. The VHF-FM Search and Rescue sites are powered by a primary power system consisting of a thermoelectric generator. Thermoelectric generators are very inefficient devices which consume vast quantities of propane to create electricity. The upgrade necessitates added power requirements on the power supply system at the remote sites. These requirements compel the redesign and/or upgrade of the power system. If thermoelectric generators continue to be utilized as the primary power system, additional helicopter visits to the sites to deliver propane will be required. These helicopter flights are costly and sometimes hazardous due to severe weather. This thesis investigates a variety of power system options capable of providing electrical power to the communications sites. Specifically, this thesis addresses three objectives. The first is a discussion of current alternative energy source technology available to supply the required power. The second is an analysis of the specific power system requirements and constraints. The third objective and major thrust of the research, is the design of a reliable hybrid power system for this application, capable of utilizing the inexhaustible natural energy available at the remote sites. The engineering parameters for a hybrid power system were studied and calculations made based on commercially available components. The difficulties in the design due to extreme weather conditions and unavailability of natural power resource information at specific sites are addressed. This thesis presents the groundwork associated with hybrid power system designs for use at remote communications sites. Hybrid power system, Solar power system, Wind Power system, Photovoltaic.

Pietras, C.R.

1993-09-01

480

The Iridium (tm) system: Personal communications anytime, anyplace  

NASA Technical Reports Server (NTRS)

The Iridium system is designed to provide handheld personal communications between diverse locations around the world at any time and without prior knowledge of the location of the personal units. This paper provides an overview of the system, the services it provides, its operation, and an overview of the commercial practices and relatively high volume satellite production techniques which will make the system cost effective. A constellation of 66 satellites will provide an orbiting, spherical-shell, infrastructure for this global calling capability. The satellites act as tall cellular towers and allow convenient operation for portable handheld telephones. The system will provide a full range of services including voice, paging, data, geolocation, and fax capabilities. Motorola is a world leader in the production of high volume, high quality, reliable telecommunications hardware. One of Iridium's goals is to apply these production techniques to high reliability space hardware. Concurrent engineering, high performance work teams, advanced manufacturing technologies, and improved assembly and test methods are some of the techniques that will keep the Iridium system cost effective. Mobile, global, flexible personal communications are coming that will allow anyone to call or receive a call from/to anyplace at anytime. The Iridium system will provide communications where none exist today. This connectivity will allow increased information transfer, open new markets for various business endeavors, and in general increase productivity and development.

Hatlelid, John E.; Casey, Larry

1993-01-01

481

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

482

Interactive video audio system: communication server for INDECT portal  

NASA Astrophysics Data System (ADS)

The paper deals with presentation of the IVAS system within the 7FP EU INDECT project. The INDECT project aims at developing the tools for enhancing the security of citizens and protecting the confidentiality of recorded and stored information. It is a part of the Seventh Framework Programme of European Union. We participate in INDECT portal and the Interactive Video Audio System (IVAS). This IVAS system provides a communication gateway between police officers working in dispatching centre and police officers in terrain. The officers in dispatching centre have capabilities to obtain information about all online police officers in terrain, they can command officers in terrain via text messages, voice or video calls and they are able to manage multimedia files from CCTV cameras or other sources, which can be interesting for officers in terrain. The police officers in terrain are equipped by smartphones or tablets. Besides common communication, they can reach pictures or videos sent by commander in office and they can respond to the command via text or multimedia messages taken by their devices. Our IVAS system is unique because we are developing it according to the special requirements from the Police of the Czech Republic. The IVAS communication system is designed to use modern Voice over Internet Protocol (VoIP) services. The whole solution is based on open source software including linux and android operating systems. The technical details of our solution are presented in the paper.

Mikulec, Martin; Voznak, Miroslav; Safarik, Jakub; Partila, Pavol; Rozhon, Jan; Mehic, Miralem

2014-05-01

483

Animal health in organic livestock production systems: a review  

Microsoft Academic Search

Organic livestock production is a means of food production with a large number of rules directed towards a high status of animal welfare, care for the environment, restricted use of medical drugs and the production of a healthy product without residues (pesticides or medical drugs). The intentions of organic livestock production have been formulated by the International Federation of Organic

A. Kijlstra; I. A. J. M. Eijck

2006-01-01

484

Animated pedagogical agents: How the presence and nonverbal communication of a virtual instructor affect perceptions and learning outcomes in a computer-based environment about basic physics concepts  

NASA Astrophysics Data System (ADS)

One important but under-researched area of instructional technology concerns the effects of animated pedagogical agents (APAs), or lifelike characters designed to enhance learning in computer-based environments. This research sought to broaden what is currently known about APAs' instructional value by investigating the effects of agents' visual presence and nonverbal communication. A theoretical framework based on APA literature published in the past decade guided the design of the study. This framework sets forth that APAs impact learning through their presence and communication. The communication displayed by an APA involves two distinct kinds of nonverbal cues: cognitive (hand and arm gestures) and affective (facial expressions). It was predicted that the presence of an agent would enhance learning and that nonverbal communication would amplify these effects. The research utilized a between-subjects experimental design. Participants were randomly assigned to treatment conditions in a controlled lab setting, and group means were compared with a MANCOVA. Participants received (1) a non-animated agent, (2) an agent with hand and arm gestures, (3) an agent with facial expressions, or (4) a fully animated agent. The agent appeared in a virtual learning environment focused on Kepler's laws of planetary motion. A control group did not receive the visual presence of an agent. Two effects were studied: participants' perceptions and their learning outcomes. Perceptions were measured with an attitudinal survey with five subscales. Learning outcomes were measured with an open-ended recall test, a multiple choice comprehension test, and an open-ended transfer test. Learners presented with an agent with affective nonverbal communication comprehended less than learners exposed to a non-animated agent. No significant differences were observed when a group exposed to a fully animated agent was compared to a group with a non-animated agent. Adding both nonverbal communication channels mitigated the disadvantages of adding just one kind of nonverbal cue. No statistically significant differences were observed on measures of recall or transfer, or on the attitudinal survey. The research supports the notion that invoking a human-like presence in a virtual learning environment prompts strong expectations about the character's realism. When these expectations are not met, learning is hindered.

Frechette, M. Casey

485

Space Station Information System requirements for integrated communications  

NASA Technical Reports Server (NTRS)

Space Station Information System (SSIS) requirements for integrated end-to-end communications are presented. The SSIS is defined as the integrated set of space and ground data and information systems and networks which will provide required data services to the Space Station flight crew, ground operations personnel, and customer communities. This model is based on the International Standards Organization (ISO) layered model for Open System Interconnection (OSI). These SSIS requirements include grades of service, priority classifications, systems management, flow control, bandwidth allocation, and standard SSIS data services.

Marker, W.; Whitelaw, V.; Muratore, J.; Bigham, J., Jr.

1987-01-01

486

PAPR reduction techniques for asymmetrically clipped optical OFDM communication system  

NASA Astrophysics Data System (ADS)

In the ultraviolet communication system, ACO-OFDM technology can effectively suppress inter-symbol interference on the system performance, and further improve the transmission rate of the system. However, ACO-OFDM has a high peak to average power ratio (PAPR), and high PAPR not only reduces the power efficiency of the optical modulator, but also bring damage to the human eye or skin. In order to solve the above problem, according to ACO-OFDM signal characteristics, two clipping and filtering algorithms are used, and its performance is simulated, the simulations show that the two algorithms are able to inhibit well the PAPR of ACO-OFDM system.

Wang, Yong; Zhang, Zhaojun; Sun, Lu

2014-07-01

487

The 30/20 GHz communications system functional requirements  

NASA Technical Reports Server (NTRS)

The characteristics of 30/20 GHz usage in satellite systems to be used in support of projected communication requirements of the 1990's are defined. A requirements analysis which develops projected market demand for satellite services by general and specialized carriers and an analysis of the impact of propagation and system constraints on 30/20 GHz operation are included. A set of technical performance characteristics for the 30/20 GHz systems which can serve the resulting market demand and the experimental program necessary to verify technical and operational aspects of the proposed systems is also discussed.

Siperko, C. M.; Frankfort, M.; Markham, R.; Wall, M.

1981-01-01

488

Radio frequency communication system utilizing radiating transmission lines  

DOEpatents

A radio communication system for use in tunnels, mines, buildings or other shielded locations in which a pair of radiating transmission lines (30), (31) extend through such location in spaced coextensive relation to each other. Each transmission line (30), (31) has at least one unidirectional amplifier (32), (33) interposed therein with the sense of the unidirectional amplifier (32) of one transmission line (30) being opposite to the sense of the unidirectional amplifier (33) of the other transmission line (31). Each of the amplifiers (32), (33) has a gain which is less than the coupling loss between the transmission lines (30), (31). Two or more mobile transceivers (35) in the location served by the system are coupled to the transmission lines (30), (31) by electromagnetic wave propagation in space in order to communicate directly with each other at a given radio frequency within the frequency range of the system.

Struven, Warren C. (San Carlos, CA)

1984-01-01

489

Comparison of Communication Architectures for Spacecraft Modular Avionics Systems  

NASA Technical Reports Server (NTRS)

This document is a survey of publicly available information concerning serial communication architectures used, or proposed to be used, in aeronautic and aerospace applications. It focuses on serial communication architectures that are suitable for low-latency or real-time communication between physically distributed nodes in a system. Candidates for the study have either extensive deployment in the field, or appear to be viable for near-term deployment. Eleven different serial communication architectures are considered, and a brief description of each is given with the salient features summarized in a table in appendix A. This survey is a product of the Propulsion High Impact Avionics Technology (PHIAT) Project at NASA Marshall Space Flight Center (MSFC). PHIAT was originally funded under the Next Generation Launch Technology (NGLT) Program to develop avionics technologies for control of next generation reusable rocket engines. After the announcement of the Space Exploration Initiative, the scope of the project was expanded to include vehicle systems control for human and robotics missions. As such, a section is included presenting the rationale used for selection of a time-triggered architecture for implementation of the avionics demonstration hardware developed by the project team

Gwaltney, D. A.; Briscoe, J. M.

2006-01-01

490

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

2006-05-01

491

Security analysis of communication system based on the synchronization of different order chaotic systems  

E-print Network

This work analyzes the security weakness of a recently proposed communication method based on chaotic modulation and masking using synchronization of two chaotic systems with different orders. It is shown that its application to secure communication is unsafe, because it can be broken in two different ways, by high-pass filtering and by reduced order system synchronization, without knowing neither the system parameter values nor the system key.

G. Alvarez; L. Hernandez; J. Munoz; F. Montoya; Shujun Li

2005-06-27

492

A communication model for interlinking national tsunami early warning systems  

NASA Astrophysics Data System (ADS)

The integration of national Tsunami Early Earning Systems (TEWS) to ocean-wide networks is a main objective of the UNESCO Intergovernmental Oceanic Commission (IOC) tsunami programme. The intention is to interlink national TEWSs leveraging warning communication during hazards. For this purpose a communication model has been developed enabling an efficient message exchange within a centre-to-centre (C2C) communication in a system-of-systems environment. The model, designed to be robust and simple, is based on existing interoperability standards from the Open Geospatial Consortium (OGC) and the Organization of the Advancement of Structured Information Standards (OASIS). For the exchange of tsunami warning bulletins the Common Alerting Protocol (CAP) is used. It supports geospatial referencing by addressing geocoded Points of Interests (POIs), Areas of Interest (AOIs) and Coastal Forecast Zones (CFZs). Moreover it supports hazard classification by standardized criticality parameters and the transmission of attachments, e.g. situation maps. The communication model also supports the exchange of sensor observations and measurements such as sea level data or earthquake parameters. For this purpose markup languages of the Sensor Web Enablement (SWE) suite are used. Both communication products, warning bulletins and sensor observations, are embedded in an envelope providing addressing and routing information using the Emergency Data Exchange Language Distribution Element (EDXL-DE). The communication model has been implemented in a first pilot based on Message Oriented Middleware (MOM). Implementation, test and validation was started in the European research project Distant Early Warning System (DEWS) and is continued successively in the project Collaborative, Complex, and Critical Decision Processes in Evolving Crises (TRIDEC). Stimulated by the concepts and results of the German Indonesian Tsunami Early Warning System (GITEWS) and based on its sensor integration platform forming the upstream information flow, the DEWS project focused on the improvement of downstream capacities of warning centres especially by improving information logistics for effective and targeted warning message aggregation for a multilingual environment. Based on these results, TRIDEC continues this task focusing on real-time intelligent information management in Earth management. The addressed challenges include the design and implementation of a robust and scalable service infrastructure supporting the integration and utilisation of existing resources with accelerated generation of large volumes of data.

Lendholt, M.; Hammitzsch, M.; Esbri Palomares, M. A.

2012-04-01

493

Understanding Mechanical Systems Through Computer Animation and Kinematic Imagery. Final Report.  

ERIC Educational Resources Information Center

One purpose of this research is to develop models of cognitive processes in understanding mechanical systems. A particular focus was on the processes in mentally animating the representation of a mechanical system, and the contribution of animation graphics in comprehension. Several studies, involving eye fixations, verbal protocols, and process…

Carpenter, Patricia A.; Just, Marcel Adam

494

Interactive 3D Animation System for Web3D Masayuki Furukawa, Shinya Fukumoto, Hiroshi Kawasaki  

E-print Network

of state model using a printer as a 3D object. In the example, three states of 3D object are defined can try 3D manual of printer by using tablet PC to learn the effectiveness of our 3D animation systemInteractive 3D Animation System for Web3D Masayuki Furukawa, Shinya Fukumoto, Hiroshi Kawasaki

Tokyo, University of

495

Human-induced changes in animal populations and distributions, and the subsequent effects on fluvial systems  

Microsoft Academic Search

Humans have profoundly altered hydrological pathways and fluvial systems through their near-extirpation of native populations of animal species that strongly influenced hydrology and removal of surface sediment, and through the introduction of now-feral populations of animals that bring to bear a suite of different geomorphic effects on the fluvial system. In the category of effects of extirpation, examples are offered

David R. Butler

2006-01-01