Relevant bibliographies by topics / And Communications

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'And Communications'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 February 2022

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Journal articles on the topic "And Communications"

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Mitchell, Don C. "Communications on Communication." Contemporary Psychology: A Journal of Reviews 33, no. 1 (January 1988): 75–76. http://dx.doi.org/10.1037/025318.

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Torikai, Tsutomu. "Satellite application technology on communications; Data communication via communications satellite." Journal of the Institute of Television Engineers of Japan 43, no. 9 (1989): 913–15. http://dx.doi.org/10.3169/itej1978.43.913.

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Vemou, Konstantina, and Maria Karyda. "Requirements for private communications over public spheres." Information & Computer Security 28, no. 1 (November 11, 2019): 68–96. http://dx.doi.org/10.1108/ics-01-2019-0002.

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Purpose In the Web 2.0 era, users massively communicate through social networking services (SNS), often under false expectations that their communications and personal data are private. This paper aims to analyze privacy requirements of personal communications over a public medium. Design/methodology/approach This paper systematically analyzes SNS services as communication models and considers privacy as an attribute of users’ communication. A privacy threat analysis for each communication model is performed, based on misuse scenarios, to elicit privacy requirements per communication type. Findings This paper identifies all communication attributes and privacy threats and provides a comprehensive list of privacy requirements concerning all stakeholders: platform providers, users and third parties. Originality/value Elicitation of privacy requirements focuses on the protection of both the communication’s message and metadata and takes into account the public–private character of the medium (SNS platform). The paper proposes a model of SNS functionality as communication patterns, along with a method to analyze privacy threats. Moreover, a comprehensive set of privacy requirements for SNS designers, third parties and users involved in SNS is identified, including voluntary sharing of personal data, the role of the SNS platforms and the various types of communications instantiating in SNS.
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Murano, Kazuo. "Future Image Communication. Communication Services. Multimedia Communications Services." Journal of the Institute of Television Engineers of Japan 47, no. 3 (1993): 290–92. http://dx.doi.org/10.3169/itej1978.47.290.

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Imre, S. "Quantum communications: explained for communication engineers." IEEE Communications Magazine 51, no. 8 (August 2013): 28–35. http://dx.doi.org/10.1109/mcom.2013.6576335.

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Amit, Elinor, Cheryl Wakslak, and Yaacov Trope. "The Use of Visual and Verbal Means of Communication Across Psychological Distance." Personality and Social Psychology Bulletin 39, no. 1 (October 4, 2012): 43–56. http://dx.doi.org/10.1177/0146167212460282.

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The current study investigated the effect of distance on medium preferences in interpersonal communication. Five experiments showed that people’s preference for using pictures (vs. words) is increasingly higher when communicating with temporally, socially, or geographically proximal (vs. distal) others. In contrast, preference for words is increasingly higher when communicating with those who were distal. A sixth experiment showed that communication’s medium influences distance preferences, such that people’s preference for communicating a message to a distant (vs. proximal) target is greater for verbal compared with pictorial communications. A seventh experiment showed that recipients are more likely to heed a sender’s suggestions when the medium and distance are congruent. These findings reflect the suitability of pictures for communication with proximal others and words with distal others. Implications of these findings for construal-level theory, perspective taking, embodied cognition, the development of language, and social skills with children are discussed.
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Sidorkina, Olena, Tetiana Poda, Oksana Skyba, Natalia Chenbai, and Ivan Skyba. "Internet communications in the information age: socio-cultural and environmental context." E3S Web of Conferences 258 (2021): 07051. http://dx.doi.org/10.1051/e3sconf/202125807051.

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The article deals with specifics of Internet communications functioning in the information technology era. The emergence and development of Internet communications in human life promote the creation of virtual reality, which significantly changes the forms of relationships between people. Instead of personal meetings and direct communication, people get used to communicating in virtual space. It affects their professional activity, studying, personal life, leisure, etc. The latest forms of Internet communication not only open up to mankind the unique opportunities for a person’s creative self-realization but also make a new socio-cultural reality. Therefore, it is necessary to study the peculiarities of the new forms of Internet communications’ functioning and their impact on social development.
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Handayani, Tri Febriana, Pande Ketut Sudiarta, and I. Made Oka Widyantara. "UJI KEAMANAN KOMUNIKASI VOIP MENGGUNAKAN SISTEM KEAMANAN SRTP-TLS PADA JARINGAN NIRKABEL." Jurnal SPEKTRUM 5, no. 1 (June 25, 2018): 13. http://dx.doi.org/10.24843/spektrum.2018.v05.i01.p02.

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VoIP is a technology used to communicate voice remotely and directly using data communication lines with TCP / IP protocol. But basically, VoIP communication does not guarantee data security when doing communication. A very important security system is added in VoIP communications to maintain the confidentiality of communication, so that communication can not be recorded and played back. To build a security when communicating VoIP, then in this study added an SRTP-TLS security system. The study was conducted on wireless networks by comparing the security of data communications when using the SRTP-TLS security system and without using a security system.Keywords: Wireless, Security System, VoIP
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MOTAI, AKIO. "Multimedia Mobile Communication System. Multimedia Mobile Communications." Journal of the Institute of Electrical Engineers of Japan 116, no. 7 (1996): 401–3. http://dx.doi.org/10.1541/ieejjournal.116.401.

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Wang, Haichao, Jinlong Wang, Guoru Ding, and Zhu Han. "D2D Communications Underlaying Wireless Powered Communication Networks." IEEE Transactions on Vehicular Technology 67, no. 8 (August 2018): 7872–76. http://dx.doi.org/10.1109/tvt.2018.2832068.

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Dissertations / Theses on the topic "And Communications"

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Kodikara, Patabandi C. K. "Multimedia communications over 3G wireless communication systems." Thesis, University of Surrey, 2004. http://epubs.surrey.ac.uk/844270/.

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This thesis addresses the transmission of video over third generation radio access networks. The first part of the thesis investigates the capabilities of Universal Terrestrial Radio Access Networks (UTRAN) in terms of the provision of multimedia communications. The error performance and traffic requirements of real-time video transmission over circuit switched and packet switched connections are examined. The effect of network parameter settings upon video performances is evaluated, and optimum radio bearer configurations for the transmission of video are derived. A method of estimating received video quality after transmission over error prone environments is developed. The quality estimation is based on a distortion model, which accurately models the overall distortion seen in decoder frame reconstruction. This includes quantisation distortion, concealment distortion, and error propagation. Based on the developed performance model, optimum MTU (Maximum Transfer Unit) size for efficient wireless video communications over a packet switched access network is derived. The second part of the thesis investigates quality enhancement techniques for multimedia traffic transmitted over wireless channels. Quality enhancement is achieved at three levels of the transmission process: link level, application level and system level. Link level quality enhancement techniques are designed to optimise the allocation of link level parameter values according to the media characteristics. A novel Unequal Error Protection scheme and a novel Unequal Power Allocation scheme are designed to exploit the inherent diversity in the subjective importance of different sections of compressed media. The algorithms are developed and analysed for transmission of video over 3G wireless systems. The effectiveness of these algorithms is demonstrated through the results of simulated transmission over a UMTS channel. Application level quality enhancement techniques are designed to explore the time-varying nature of the wireless channel. A number of link adaptation schemes are proposed for real time video communication and real-time video streaming over 3G wireless systems. These algorithms are designed to enhance the perceptual video quality, and the system utilisation. This is achieved by adapting the allocated radio network parameters and the source parameters, according to a feedback channel condition. Simulation results show a significant performance improvement compared to non-adaptive schemes. Finally, system level adaptation techniques are designed for efficient radio resource allocation in multi-user scenarios. Two adaptive resource allocation schemes are proposed and analysed for real-time video communications in a UMTS system. The proposed algorithms are shown to provide improved performances in terms of average received video quality and user satisfaction. Key words: Wireless Communication, Multimedia communication. Video Transmission.
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Bezuidenhout, Quintus. "Satellite communications strategy selection for optimal LEO satellite communication." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71930.

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Thesis (MScEng)--Stellenbosch University, 2012.
ENGLISH ABSTRACT: A low earth orbit satellite system can be useful in numerous communication applications where physical connections are not possible. Communication time available from any point on earth to the satellite is less than one hour per day. This one hour is fragmented into smaller time slots due to the satellite orbiting. This is not much time to transfer data and there is even less time available to transfer data when there are other external factors affecting the system. It is thus crucial to optimise the satellite communications link so that more data can be transferred per orbit. The goal of this thesis is to improve the performance of a low earth orbit satellite communication channel by varying certain parameters of the system, such as the protocol used, modulation scheme, packet size, transmission power etc. and then to observe how these parameters influence the system. The protocols that were chosen to be implemented are CSMA-CA, CSMA-CA with DSSS technology and Round-Robin Polling. A simulator for each protocol was designed with the Opnet platform, so that specific parameters could be changed and the results observed, in order to optimise the communications link between the satellite and ground stations. The results showed that there is no particular configuration of modulation scheme, packet size, transmission power etc. presenting the best overall solution for LEO satellite communications. It must be considered what the specific LEO satellite application would be used for and the characteristics required by that specific application. A suitable configuration must subsequently be chosen from the set of configurations available to satisfy most of the application requirements.
AFRIKAANSE OPSOMMING: ’n Satelliet met ’n lae wentelbaan kan gebruik word in verskeie kommunikasie toepassings waar fisiese verbindinge nie noodwendig moontlik is nie. Die kommunikasietyd van enige punt van aarde af na die satelliet, is minder as een uur per dag. Hierdie tyd word nog verder verklein omdat die satelliet besig is om, om die aarde te wentel. ’n Uur is glad nie baie tyd om data oor te dra nie en in realiteit is daar nog minder tyd beskikbaar as daar eksterne faktore op die sisteem inwerk. Dus is dit baie belangrik om die satelliet kommunikasiekanaal te optimiseer sodat soveel moontlik data as moontlik oorgedra kan word per omwenteling. Die doel van hierdie tesis is om die deurset van die kommunikasiekanaal van n lae wentelbaan satelliet te optimiseer, deur verskeie parameters te verander soos, protokol wat gebruik word, modulasie skema, pakkie grootte, transmissiekrag ens. en dan waar te neem hoe dit die sisteem beïnvloed. Die protokolle wat geïmplementeer is, is CSMA-CA, CSMA-CA met DSSS tegnologie en Round-Robin Polling. ’n Simulator vir elke protokol was ontwerp in die Opnet simulasie platform, sodat die spesifieke parameters verander kon word om die resultate te bestudeer met die doel om die kommunikasiekanaal tussen die satelliet en grond stasies optimaal te benut. Die resultate het bewys dat daar geen spesifieke konfigurasie van modulasie skema, pakkie grootte, transmissiekrag ens. is wat die algehele beste oplossing is nie. Die spesifieke applikasie waarvoor die lae wentelbaan satelliet gaan gebruik word moet geanaliseer word sowel as die spesifieke karakteristieke van daai applikasie. Daarvolgens moet n unieke konfigurasie opgestel word wat meeste van die applikasie se behoeftes bevredig.
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Radford, Benjamin. "Misinformation in eating disorder communications| Implications for science communication policy." Thesis, State University of New York at Buffalo, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1546959.

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Though eating disorders are a serious public health threat, misinformation about these potentially deadly diseases is widespread. This study examines eating disorder information from a wide variety of sources including medical journals, news reports, and popular social activist authors. Examples of misinformation were identified, and three aspects of eating disorders (prevalence, mortality, and etiology) were chosen as key indicators of scientific illiteracy about those illnesses. A case study approach was then adopted to trace examples of misinformation to their original sources whenever possible. A dozen examples include best-selling books, national eating disorder information clearinghouses; the news media; documentary feature films; and a PBS television Nova documentary program. The results provide an overview of the ways in which valid information becomes flawed, including poor journalism, lack of fact-checking, plagiarism, and typographical errors. Less obvious—and perhaps even more important—much of the misinformation results from scientific research being co-opted to promote specific sociopolitical agendas. These results highlight a significant gap in science communication between researchers, the medical community, and the public regarding these diseases, and recommendations to address the problem are offered.

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Rajapakshalage, D. (Dhanushka). "Infrastructure based communication architecture to facilitate autonomous driving and communications." Master's thesis, University of Oulu, 2019. http://jultika.oulu.fi/Record/nbnfioulu-201909242926.

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Abstract. The traditional autonomous vehicle (AV) architecture places a heavy burden on graphics processing units of the vehicle due to heavy signal processing requirements. Ultimately this results in performance degradation in AVs. This is mainly due to advanced sensors, which enable the vision for AVs, like Light Detection and Ranging (LiDAR), radars and cameras. In most of the AV models accepted by many leading automobile companies, LiDAR plays a significant role. It generates a high definition (HD) point cloud of the surroundings to obtain a precise map. AV makes decisions based on that by processing Terabyte (Tb) scale data within the AV. Still, vehicle-mounted LiDARs are not capable of providing information beyond a human driver’s vision. To provide a solution for the above-mentioned drawbacks of the traditional AVs, we propose an infrastructure based communication architecture to facilitate autonomous driving and communications. A set of coordinated LiDAR modules with integrated transceivers, which are mounted at an elevation with a bird’s eye view, can provide a much larger field of vision (FoV). Decisions are taken from a centralized body. We prove the technical feasibility of the system from sensing and communication point of view. The proposed architecture can play a supportive role with traditional AV architectures and it can be applied to many cases such as to automate harbours and factory floors. In the second part of the thesis, we address a resource allocation problem with ultra-reliable and low latency communication (URLLC) for a factory floor. We have analytically proven the capability of the proposed system to establish a reliable (packet error probability less than 10^(-5)) and low latency (less than 1 ms transmission delay) links with sufficient throughput (kilobit scale) using a convex optimization problem. Latency, throughput and reliability variations are studied under the short packet transmission of the proposed system.
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Murphy, Melvin Murphy. "Internal Strategies for Assessing Organizational Communication Channel Effectiveness." ScholarWorks, 2017. https://scholarworks.waldenu.edu/dissertations/3406.

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Evolving communication technology, the increased volume of information needed by businesses, and the intensified competitive environment have made internal company communication more critical to business success. The purpose of this multiple case study was to explore strategies used by managers and leaders of 3 law firms in the Commonwealth of Virginia for assessing the effectiveness of their organization's internal communication channels. The participating firms were recognized by their peers as being exceptionally well-managed. Data from interviews and company documents were analyzed through the conceptual lens of the channel expansion theory and the use of software coding to identify patterns and themes. Three important themes emerged: informal assessment strategies, indirect assessment strategies, and efficient versus timely assessments. The first theme suggested the effectiveness of an informal assessment strategy, depending on the size and complexity of the organization. The second theme reflected the effectiveness of an indirect assessment for organizations that lack the resources to support a more direct and specific assessment process. The third theme reflected the participants' perceptions of informal and indirect assessments may be more efficient, the feedback from the assessments are often less timely. Managers may consider these themes in formulating communication policies. The findings of this case study may have implications for positive social and economic change. Small professional service firms, such as legal firms, provide important services to individuals, families, and businesses in their community.
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Gregersen, Svein Erik Søndervik. "Underwater Communications : An OFDM-system for Underwater Communications." Thesis, Norwegian University of Science and Technology, Department of Electronics and Telecommunications, 2007. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-8735.

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In the fall 2006 NTNU (The Norwegian University and Science and Technology) initiated a strategic project in cooperations with SINTEF where the aim is to gain more knowledge about underwater acoustic communications. This study is a part of this project and focuses on a system for underwater communication. A orthogonal frequency division multiplexing (OFDM) system using differential quadrature phase shift keying (DQPSK) has been defined and implemented in MATLAB. The system has been characterized through thorough simulations and testing. Initial measurements has also been carried out in order to test the developed system on a real underwater acoustic channel and the results have been analysed.

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Puglia, Vincent. "Unified communications : the search for ROI through tomorrow's business communication solutions /." Online version of thesis, 2010. http://hdl.handle.net/1850/11590.

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Vantine, Karin. "Communications sourcebook /." Online version of thesis, 1992. http://hdl.handle.net/1850/11867.

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Wong, Chi Chong. "Personal communications." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/70862.

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Lichtman, Marc Louis. "Antifragile Communications." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/72267.

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Jamming is an ongoing threat that plagues wireless communications in contested areas. Unfortunately, jamming complexity and sophistication will continue to increase over time. The traditional approach to addressing the jamming threat is to harden radios, such that they sacrifice communications performance for more advanced jamming protection. To provide an escape from this trend, we investigate the previously unexplored area of jammer exploitation. This dissertation develops the concept of antifragile communications, defined as the capability for a communications system to improve in performance due to a system stressor or harsh condition. Antifragility refers to systems that increase in capability, resilience, or robustness as a result of disorder (e.g., chaos, uncertainty, stress). An antifragile system is fundamentally different from one that is resilient (i.e., able to recover from failure) and robust (i.e., able to resist failure). We apply the concept of antifragility to wireless communications through several novel strategies that all involve exploiting a communications jammer. These strategies can provide an increase in throughput, efficiency, connectivity, or covertness, as a result of the jamming attack itself. Through analysis and simulation, we show that an antifragile gain is possible under a wide array of electronic warfare scenarios. Throughout this dissertation we provide guidelines for realizing these antifragile waveforms. Other major contributions of this dissertation include the development of a communications jamming taxonomy, feasibility study of reactive jamming in a SATCOM-type scenario, and a reinforcement learning-based reactive jamming mitigation strategy, for times when an antifragile approach is not practical. Most of the jammer exploitation strategies described in this dissertation fall under the category of jammer piggybacking, meaning the communications system turns the jammer into an unwitting relay. We study this jammer piggybacking approach under a variety of reactive jamming behaviors, with emphasis on the sense-and-transmit type. One piggybacking approach involves transmitting using a specialized FSK waveform, tailored to exploit a jammer that channelizes a block of spectrum and selectively jams active subchannels. To aid in analysis, we introduce a generalized model for reactive jamming, applicable to both repeater-based and sensing-based jamming behaviors. Despite being limited to electronic warfare scenarios, we hope that this work can pave the way for further research into antifragile communications.
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Books on the topic "And Communications"

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Communication et réseaux de communications: Séminaire. 7th ed. Paris: Editions ESF, 1988.

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Police, Illinois State. Communications: Communications equipment technician. Springfield, Ill: ISP Central Printing Section, 2003.

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Police, Illinois State. Communications: Communications equipment technician. Springfield, Ill: ISP Central Printing Section, 2008.

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Sauvain, Philip Arthur. Communications. Austin, Tex: Raintree Steck-Vaughan, 1994.

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Kerrod, Robin. Communications. Oxford: Heinemann Library, 1995.

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America, Boy Scouts of. Communications. Irving, Tex: Boy Scouts of America, 2001.

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Communications. New York: Twenty-First Century Books, 1994.

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Communications. Chicago, Ill: Heinemann Library, 2002.

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Police, Illinois State. Communications. Springfield, Ill.]: [ISP], 1999.

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Communications. New York: Marshall Cavendish, 1989.

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Book chapters on the topic "And Communications"

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Noll, Roger G. "Communications." In The World of Economics, 87–98. London: Palgrave Macmillan UK, 1991. http://dx.doi.org/10.1007/978-1-349-21315-3_13.

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Hargitay, Stephen, and Timothy Dixon. "Communications." In Software Selection for Surveyors, 92. London: Palgrave Macmillan UK, 1991. http://dx.doi.org/10.1007/978-1-349-21696-3_17.

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Brown, J. Frank. "Communications." In The Global Business Leader, 19–30. London: Palgrave Macmillan UK, 2007. http://dx.doi.org/10.1057/9780230579453_3.

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Bartle, Ian. "Communications." In Handbook of Public Policy in Europe, 217–28. London: Palgrave Macmillan UK, 2004. http://dx.doi.org/10.1057/9780230522756_20.

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Westphal, Louis C. "Communications." In Handbook of Control Systems Engineering, 129–46. Boston, MA: Springer US, 2001. http://dx.doi.org/10.1007/978-1-4615-1533-3_7.

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Paul, Aidan. "Communications." In Flemings, 99–107. London: Macmillan Education UK, 1989. http://dx.doi.org/10.1007/978-1-349-10985-2_10.

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Mason, S. "Communications." In Work Out Social and Economic History GCSE, 186–221. London: Macmillan Education UK, 1988. http://dx.doi.org/10.1007/978-1-349-10295-2_10.

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Sanchez, Andres R. "Communications." In Technical Support Essentials, 225–41. Berkeley, CA: Apress, 2009. http://dx.doi.org/10.1007/978-1-4302-2548-5_11.

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Bradley, D. A., D. Dawson, N. C. Burd, and A. J. Loader. "Communications." In Mechatronics, 257–79. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-3068-8_15.

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Noll, Roger G. "Communications." In The New Palgrave Dictionary of Economics, 1879–88. London: Palgrave Macmillan UK, 2018. http://dx.doi.org/10.1057/978-1-349-95189-5_50.

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Conference papers on the topic "And Communications"

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Zhdanova, Svetlana Nikolaevna. "INTERCULTURAL COMMUNICATIONS AS A SCIENTIFIC AND PROFESSIONAL PHENOMENON." In Сollection of articles. Publishing house Sreda, 2019. http://dx.doi.org/10.31483/r-53723.

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In the course of a theoretical analysis, the concepts of “communication” and “intercultural communication” are clarified, the relevance of intercultural professional and scientific - pedagogical communications in an information society, expanding the scale of intercultural interaction of teachers, is revealed. The necessity of the development of intercultural communicative competence of the teacher as a result of the development of intercultural communications in professional - pedagogical activity is substantiated.
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Takahashi, Takashi, Naoko Yoshimura, Akira Akaishi, Norihiko Katayama, Morio Toyoshima, Naoto Kadowaki, Shojiro Ishibashi, Tatsuya Fukuda, and Hiroshi Yoshida. "The Tele-Operation Experiment of the Hybrid Remotely Operated Vehicle Using Satellite Link." In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-41645.

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Communication via satellite is the only method for communicating between the ocean and land. However, present commercial satellites cannot provide sufficient bandwidth to transmit the requisite volume of data. The National Institute of Information and Communications Technology (NICT) and the Japan Agency for Marine-Earth Science and Technology (JAMSTEC) conducted broadband satellite communication experiments with the Wideband Inter-Networking engineering test and Demonstration Satellite (WINDS). Using WINDS, the tele-operation of a hybrid remotely operated vehicle (HROV), Otohime, was also carried out successfully.
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Li, Le, Zhaoyang Ma, and Fei Zhou. "FPGA-Based Technologies Improving the Efficiency of Point to Point Communications in Safety-Related DCSs." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-67903.

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As a part of a reactor protection system in safety-related Distributed Control Systems (DCSs) applied in nuclear power plants, Point to Point Communications (PPC) mostly influence the response time of shutdown of a nuclear reactor. A new solution to improve efficiency for point to point communications is receiving increased attention. In this paper, a FPGA-based point to point communications system is proposed, which extremely enhances the communication efficiency for the network communication card with multi-ports. It also delivers a method to meet the requirement of high safety and reliability. In addition, the contribution of shortening the response time of shutdown of a nuclear reactor is presented, which is derived from analysing and calculating the response time based on FirmSys, the first DCS with safety class 1E produced by China with proprietary intellectual property. A validation scheme is also established for verifying the new proposed FPGA-based point to point communications system. The validated platform is built based on the current FirmSys system. The experimental data and calculated result are present in the article. In conclusion, it is proved that the FPGA-based point to point communications could be used to promote the efficiency of point to point communications and shorten the response time of shutdown of a nuclear reactor.
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Himsoon, T. Kee, and W. Pam Siriwongpairat. "Design and Analysis of 220 MHz RF Communications for Interoperable Positive Train Control System." In 2011 Joint Rail Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/jrc2011-56073.

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The interoperable positive train control (PTC) system uses radio frequency (RF) in the 220 MHz band for wireless communications. Robust and reliable 220 MHz RF communication is critical to the success of the interoperable PTC system. To ensure proper operation of the interoperable PTC system, it is thus crucial to properly engineer and evaluate RF performance of communications from wayside devices and base stations to trains operating along PTC controlled track. This paper presents a design of wireless communications over the 220 MHz band for the interoperable PTC system. Performance of the designed 220 MHz PTC communications is analyzed and theoretical predictions are provided. The paper also presents a simulation system architecture for analyzing the performance of PTC communications over the 220 MHz band. The simulation system test bed integrates a message generator, RF channel simulator, and PTC software-defined radio prototypes configured as a base, locomotive, or wayside radio. Extensive simulations were conducted to determine RF performance of PTC radio communications in various scenarios including flat terrain and city environments. Simulation results are given and compared to the theoretical predictions.
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Fitzmaurice, Michael. "Survey and Examination of Various CBTC Data Communications Subsystems." In 2013 Joint Rail Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/jrc2013-2494.

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This paper will survey and describe the various data communication subsystems (DCSs) used on many communications based train control (CBTC) system projects planned and in service throughout North America, Europe and Asia. The paper will focus on the RF characteristics of the DCS so as to highlight the similarities and common challenges that all DCSs face with a view to presenting best practice and innovative design.
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Fluker, Joy, and Meg Coffin Murray. "Transforming Communications in the Workplace: The Impact of UC on Perceived Productivity in a Multi-national Corporation." In InSITE 2017: Informing Science + IT Education Conferences: Vietnam. Informing Science Institute, 2017. http://dx.doi.org/10.28945/3714.

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[This Proceedings paper was revised and published in the Interdisciplinary Journal of Information, Knowledge, and Management (IJIKM)] Aim/Purpose: Unified Communications (UC) is touted as a technology that will transform business communication. While positive claims abound, the factors of UC attributable to its success have yet to be identified. By examining how users perceive UC impacts productivity, this study aids organizations in making better decisions regarding investments in and usage of communications technologies. Background: Unified Communications integrates disparate communications and information sharing applications into a single platform. The promise of UC is that it will revolutionize the workplace by providing a more synchronized fit between the way people communicate and the technology they use. Methodology: Through case study research conducted within a large multinational corporation (the Hewlett Packard Company), this study investigated the impact of UC on productivity. Interview narratives were examined using an open coding technique to capture individual perceptions of productivity. Further, to assess the role UC plays in facilitating relationship building and its connection to productivity, participant responses were mapped to the key factors of technology that influence relationships within an organization as identified by Dillon and Montano (2005). Contribution: This research contributes to studies on the impact of UC on productivity in the workplace. Findings: UC was found to increase personal productivity, remove communication barriers, and create a more positive work environment. Recommendations for Practitioners : The findings of this study will aid organizations in making investment decisions as they evolve their business communications strategy. Impact on Society : Unified Communications will play an increasingly important role as people adapt to the evolving digital world through which they communicate and collaborate. Future Research: Little research exists that examines the impact of UC within an organization. Additional research investigating the use of UC in a variety of business sectors is needed.
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Różański, Grzegorz. "Security of communication in the special communications systems." In Radioelectronic Systems Conference 2019, edited by Piotr Kaniewski and Jan Matuszewski. SPIE, 2020. http://dx.doi.org/10.1117/12.2565307.

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Tsiligkaridis, Theodoros, Keith W. Forsythe, and David W. Browne. "Optimal communication jamming rate tradeoff for MIMO communications." In 2015 IEEE Wireless Communications and Networking Conference (WCNC). IEEE, 2015. http://dx.doi.org/10.1109/wcnc.2015.7127444.

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Wei Li, Mingfeng Li, and Yanyan Hao. "A high reliable satellite communication for emergency communications." In IET International Conference on Communication Technology and Application (ICCTA 2011). IET, 2011. http://dx.doi.org/10.1049/cp.2011.0781.

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Little, Thomas D. C., Ashish Agarwal, Jimmy Chau, Matt Figueroa, Aaron Ganick, Johnathan Lobo, Travis Rich, and Peter Schimitsch. "Directional communication system for short-range vehicular communications." In 2010 IEEE Vehicular Networking Conference (IEEE VNC). IEEE, 2010. http://dx.doi.org/10.1109/vnc.2010.5698230.

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Reports on the topic "And Communications"

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Galassi, Mark C. DIORAMA Communications. Office of Scientific and Technical Information (OSTI), May 2016. http://dx.doi.org/10.2172/1253557.

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Reid, D. Crisis communications. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1994. http://dx.doi.org/10.4095/193905.

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Mahadevan, L., David Walt, and George M. Whitesides. Chemical Communications. Fort Belvoir, VA: Defense Technical Information Center, April 2012. http://dx.doi.org/10.21236/ada577781.

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Omenetto, Fiorenzo G., and David L. Kaplan. Chemical Communications. Fort Belvoir, VA: Defense Technical Information Center, October 2012. http://dx.doi.org/10.21236/ada577840.

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Tailor, Sanjay. Wireless Communications. Fort Belvoir, VA: Defense Technical Information Center, June 1996. http://dx.doi.org/10.21236/ada310023.

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Preckshot, G. G. Data communications. Office of Scientific and Technical Information (OSTI), August 1993. http://dx.doi.org/10.2172/10178199.

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SECRETARY OF THE AIR FORCE WASHINGTON DC. Communications and Information: Communications Security (COMSEC) User Requirements. Fort Belvoir, VA: Defense Technical Information Center, November 1997. http://dx.doi.org/10.21236/ada404977.

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Bohl, Dwight. Communications and Information. Communications Security: Protected Distribution Systems (PDS). Fort Belvoir, VA: Defense Technical Information Center, December 2000. http://dx.doi.org/10.21236/ada404837.

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SECRETARY OF THE AIR FORCE WASHINGTON DC. Communications and Information: Compendium of Communications and Information Terminology. Fort Belvoir, VA: Defense Technical Information Center, February 2002. http://dx.doi.org/10.21236/ada404985.

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Waltjen, K., C. Romero, S. Azevedo, F. Dowla, A. Spiridon, D. Benzel, and P. Haugen. Ultra-wideband Communications. Office of Scientific and Technical Information (OSTI), February 2004. http://dx.doi.org/10.2172/15013960.

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