Дисертації з теми "Science communications"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-50 дисертацій для дослідження на тему "Science communications".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
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.
Повний текст джерелаThough 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.
Lacayo, Virginia. "Communicating Complexity: A Complexity Science Approach to Communication for Social Change." Ohio University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1367522049.
Повний текст джерелаAbramsky, R. S. "Lay empowerment in science." Thesis, Loughborough University, 1999. https://dspace.lboro.ac.uk/2134/33212.
Повний текст джерелаTerzic, Marilyn. "Understanding television: the art and science of aesthetic response." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=104508.
Повний текст джерелаCette thèse étudie les processus de perception et de cognition et démontre leurs applications à la création de contenu télévisuel ayant une valeur artistique et esthétique. En réexaminant les connaissances et hypothèses antérieures, les façons dont les artistes et les producteurs de médias ont manipulé les facultés de traitement des informations de leurs auditoires, et donc la signification qu'ils attribuaient à des images fixes et animées, sont explorées. Pour refléter la nature multidisciplinaire de l'esthétique de la télévision, cette recherche ne se limite pas à une discipline académique particulière. Au lieu de cela, elle s'appuie sur divers courants de recherche et domaines d'érudition (études sur les médias, le marketing, la psychologie, les neurosciences, et les beaux-arts) pour combler le fossé entre la théorie scientifique et la pratique artistique, afin de formuler des recommandations visant à la création de matériel audiovisuel qui remplit les trois fonctions de l'art: l'intensification, la clarification, et l'interprétation de l'expérience.
Vantine, Karin. "Communications sourcebook /." Online version of thesis, 1992. http://hdl.handle.net/1850/11867.
Повний текст джерелаFay, Leon. "Equalizers for communications satellites." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/45992.
Повний текст джерелаIncludes bibliographical references (p. 57).
This thesis investigates equalization for advanced protected satellite communications systems in development at MIT Lincoln Laboratory. Equalizers facilitate high data rate communication by correcting dispersion in the transmitter and receiver signal chains. An automated calibration procedure for finding optimal equalizers was developed. Repeated testing addressed questions about noise amplification, filter complexity requirements, and narrow band performance degradation. After examining various architectures, it was determined that the FIR filter was the best equalizer structure given the nature of the channel. The basic calibration procedure was also extended for use at high RF frequencies by using a spectrum analyzer as a tuned receiver.
by Leon Fay.
M.Eng.
Yu, Hua-Long. "Testability-directed specification of communications software." Thesis, University of Ottawa (Canada), 1992. http://hdl.handle.net/10393/7560.
Повний текст джерелаMao, Chunxu. "Integrated filtering antennas for wireless communications." Thesis, University of Kent, 2017. https://kar.kent.ac.uk/69475/.
Повний текст джерелаCarter, Nicholas Brent. "The communication of science to the public: A philosophy of television /." The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487944660929608.
Повний текст джерелаRugbeer, Hemduth. "Communicating by ordering electrons : the development of electronic communication as part of a secondary school Communication Science curriculum in the Language, Literacy and Communication learning area." Thesis, University of Zululand, 2001. http://hdl.handle.net/10530/314.
Повний текст джерелаIn this thesis I focus on the introduction of Electronic Cornmunication as part of an envisaged Communication Science curriculum in the Language, Literacy and Communication Learning area of the Further Education and Training band. In the course of my thesis I will show that the requisite elements of verbal and written cornmunication are dispersed throughout the Language, Literacy and Communication learning area in the General Education and Training band, and that they can be utilised as basis for formally introducing Communication Science, as a subject in the Language, literacy and Communication learning area in the Further Education and Train¬ing band. I also show that electronic communication will form a crucial area of study in such a Communication Science curriculum. I argue that due to the diversity of cultures in South Africa, cross-cultural cornmunication is required in such a curriculum. I also argue that by the very na¬ture of Outcomes-Based Education it is necessary to have a subject into our school curriculum that will form an interface with conceptual learning and experiential learning, that will contextu-alise language study within the more comprehensive scope of forms of human communication, and that will form an interface between the humanities and science to prevent the humanities from becoming soft options in Further Education and Training band learning programmes. To this effect I focus on the crucial role of Constructivism as integrating theory to account for vari¬ous approaches to motivational learning, the primary form of learning required in Outcomes-Based Education. I examine the principles of curriculum construction in OBE and its associated culture of learn¬ing against the backdrop of the theory of Situated Cognition. This presents a platform to argue the case for Electronic Communication as part of Communication Science in the Further Edu¬cation and Training band curricula in South African schools.
National Research Foundation
Luchina, Anna, and Giacomo Codazzi. "Marketing Communication Strategy for a Science Park." Thesis, Högskolan Dalarna, Företagsekonomi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:du-30795.
Повний текст джерелаXu, Zhe. "Real-time expressive Internet communications." Thesis, Bournemouth University, 2005. http://eprints.bournemouth.ac.uk/437/.
Повний текст джерелаLeuca, Magdalena. "Security issues in wireless communications." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/10266.
Повний текст джерелаIncludes bibliographical references (leaves 99-103).
by Magdalena Leuca.
M.Eng.
Papastavrou, Jason D. "Distributed detection with selective communications." Thesis, Massachusetts Institute of Technology, 1986. http://hdl.handle.net/1721.1/15013.
Повний текст джерелаMICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING
Bibliography: leaves 117-118.
by Jason D. Papastavrou.
M.S.
Aleem, Syed A. "Protocol engineering issues for open systems communications." Thesis, University of Ottawa (Canada), 1990. http://hdl.handle.net/10393/6011.
Повний текст джерелаLei, Zhijun. "Video transcoding techniques for wireless video communications." Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/29134.
Повний текст джерелаSun, Min-Te. "Supporting communications in ad hoc network systems /." The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486462702466432.
Повний текст джерелаGiroudeau, Rodolphe. "ordonnancement et communications." Habilitation à diriger des recherches, Université Montpellier II - Sciences et Techniques du Languedoc, 2012. http://tel.archives-ouvertes.fr/tel-00797855.
Повний текст джерелаDong, Chen. "Buffer-aided multihop wireless communications." Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/364737/.
Повний текст джерелаXu, Chao. "Reduced-complexity communications system design." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/381515/.
Повний текст джерелаDoser, Adele Beatrice 1967. "Multiple user communications for telescience." Thesis, The University of Arizona, 1992. http://hdl.handle.net/10150/291989.
Повний текст джерелаBhardwaj, Manish 1976. "Communications in the observation limited regime." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/53191.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (p. 141-145).
We consider the design of communications systems when the principal cost is observing the channel, as opposed to transmit energy per bit or spectral efficiency. This is motivated by energy constrained communications devices where sampling the signal, rather than transmitting or processing it, dominates energy consumption. We show that sequentially observing samples with the maximum a posteriori entropy can reduce observation costs by close to an order of magnitude using a (24,12) Golay code. This is the highest performance reported over the binary input AWGN channel, with or without feedback, for this blocklength. Sampling signal energy, rather than amplitude, lowers circuit complexity and power dissipation significantly, but makes synchronization harder. We show that while the distance function of this non-linear coding problem is intractable in general, it is Euclidean at vanishing SNRs, and root Euclidean at large SNRs. We present sequences that maximize the error exponent at low SNRs under the peak power constraint, and under all SNRs under an average power constraint. Some of our new sequences are an order of magnitude shorter than those used by the 802.15.4a standard.
(cont.) In joint work with P. Mercier and D. Daly, we demonstrate the first energy sampling wireless modem capable of synchronizing to within a ns, while sampling energy at only 32 Msamples per second, and using no high speed clocks. We show that traditional, minimum distance classifiers may be highly sensitive to parameter estimation errors, and propose robust, computationally efficient alternatives. We challenge the prevailing notion that energy samplers must accurately shift phase to synchronize with high precision.
by Manish Bhardwaj.
Ph.D.
Barber, Thomas J. (Thomas James). "BodyLAN--a low-power communications system." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/32684.
Повний текст джерелаAzizoḡlu, Murat. "Phase noise in coherent optical communications." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/13463.
Повний текст джерелаIncludes bibliographical references (p. 201-206).
by Murat AzizoÄlu.
Ph.D.
Zhu, Keqin. "QoS-based multicast routing for real-time communications." Thesis, University of Ottawa (Canada), 2003. http://hdl.handle.net/10393/29007.
Повний текст джерелаQuesnell, Bethany. "Trust me, I have a PhD: the effects of religion, political conservatism, and exposure to science feature stories on trust in science." Thesis, Kansas State University, 2015. http://hdl.handle.net/2097/19709.
Повний текст джерелаJournalism and Mass Communications
Joye C. Gordon
Widespread debates about scientific issues, from global warming to vaccinations, have raised questions about public trust in science and scientists. Many studies have attempted to determine the cause of observed declines in public trust. This project employs framing theory, suggesting that the way science frames research might improve public trust. Research questions explore whether political conservatism, public religiosity, and exposure to a feature story about a scientist affects trust in science and scientists. A between-subjects quasi-experiment exposed participants to feature articles about scientists in either controversial or non-controversial fields, and asked a series of questions in order to measure the participant’s trust in science and scientists. Results indicated that participants who were male or participants who had some college education and who read the non-controversial feature story were statistically more likely to have a higher level of trust in science and scientists than any other group. Suggestions for future studies are discussed.
Chiu, William Franklin. "The Internet, Political Communications Research and the Search for a New Information Paradigm." Thesis, University of California, Irvine, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3565847.
Повний текст джерелаThe Internet, as a digital record of human discourse, provides an opportunity to directly analyze political communicative behavior. The rapid emergence of social online networks augurs a transformation in the quality and quantity of information people have to evaluate their political system. Digital formats instantiate new categories of actors and new capacities to intervene in political discourse. Existing theories of political communication fail to account for the time lag, speed, anonymity and nature of replication inherent in digital formats. To fully investigate the digital record, scholars need a new framework that apprehends the complex density of a multidirectional political discourse that defies traditional time controls.
Using information and linguistic theory we develop and apply a functional, information flow model that illuminates the conceptual relationships and capacities of people to shape their information environment. Actors are defined in terms of their communicative role in idea exchange and the logic of communication is alloyed with political considerations to examine the scopes of action and immersion scenarios that affect communicants.
Our modular and scalable theory offers a way to measure signal fidelity, node activation, and message branching. We define signaling and amplification schemes and effects and explore the benefits and disadvantages of amplification devices for speakers and recipients. We show how individual actors are linked by the micro information streams they receive and transmit. We are therefore able to model exposure conditions of a multiple input, noisy spectrum for citizens and provide a counterpoint to the simple, controlled environment of agenda-setting experiments.
Finally, due to its foundation in information theory, our framework provides a natural platform by which to organize and develop a research program that uses computational linguistics and data mining techniques.
Herman, Jennifer Linda. "Effecting Science in Affective Places: The Rhetoric of Science in American Science and Technology Centers." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1396961008.
Повний текст джерелаLarsson, Johannes. "Streamline Communications in Radiology." Thesis, Linköping University, Department of Computer and Information Science, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-17421.
Повний текст джерелаThe background to the study was Unified Communications (UC), defined as Communications integrated to optimize business processes. A case study design is used to develop a LoFi-prototype. The prototype investigateswhat components an integrated communication solution should provide,for the people in radiology. The design was inspired by consumer products likeSkype. In these consumer products were functionality and look studied. The reason for integrate it into Sectra MEI, was that Sectra believed the system’s features could be even more useful, when used together with a communication solution. The prototype is tested on users (usability tested). To bundle the growing pile of requirements in the design process was a requirement specification produced.
Lu, Ying. "Agent-based service discovery in ad-hoc communications environments." Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/26703.
Повний текст джерелаAsikhan-Berlinguette, Nursel. "Communications service synthesis from informal specifications and sequence diagrams." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0015/MQ57081.pdf.
Повний текст джерелаWey, Shou-Jen. "Performance analysis of error control protocols in computer communications /." The Ohio State University, 1990. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487681788254348.
Повний текст джерелаTelatar, Ä°brahim Emre. "Multi-access communications with decision feedback decoding." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/13237.
Повний текст джерелаIncludes bibliographical references (leaves 84-85) and index.
by Ä°brahim Emre Telatar.
Ph.D.
Cox, Robert Williams 1979. "Laboratory experiments for a wireless communications course." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/87221.
Повний текст джерелаIncludes bibliographical references (p. 123-124).
by Robert Williams Cox, IV.
M.Eng.
Wilcoxson, Donald C. (Donald Craig). "Phase noise in low-power radio communications." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/38178.
Повний текст джерелаIncludes bibliographical references (leaves 99-101).
by Donald C. Wilcoxson.
Elec.E.
Mohapi, Setumo J. (Setumo James). "Power control for spread spectrum communications systems." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/39756.
Повний текст джерелаWelborn, Matthew Lee 1966. "Flexible signal processing algorithms for wireless communications." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/86556.
Повний текст джерелаIncludes bibliographical references (p. 129-132).
by Matthew Lee Welborn.
Ph.D.
Mastin, Alan. "Human-Machine Interface for Tactical Air Traffic Control Communications." UNF Digital Commons, 1990. http://digitalcommons.unf.edu/etd/133.
Повний текст джерелаCorser, George P. "Securing location privacy in vehicular applications and communications." Thesis, Oakland University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10169186.
Повний текст джерелаVehicular communications systems may one day save lives, reduce fuel consumption, and advance connectivity, but they may also transmit information which could be deanonymized to obtain personal information. Vehicle location data are of special concern because they could be used maliciously. This dissertation presents a systematic study resulting in novel definitions, metrics and methods for evaluating and applying location privacy preserving protocols specifically in vehicular settings.
Previous work in vehicular network privacy has not thoroughly considered vehicular mobility patterns. Previous work in vehicular network privacy has not solved the problem of collusion between MAC layer and application layer attackers. As defenses against location privacy attacks, previous work has favored the privacy methods of anonymization and obfuscation, but these methods have weaknesses. Spatial-temporal cloaking, for example, requires overhead of trusted third parties, and provides little protection in low vehicle densities especially when applications require frequent precise location data. Little published work has addressed the "location" part of location privacy, the geographical distance of location privacy, focusing instead on the size of the anonymity set. The need for new metrics is indicated.
The present research addresses these issues. In addition to new definitions and metrics, this study develops privacy methods which would (1) accommodate vehicular mobility patterns, (2) defend against collusion by MAC and application layer attackers, (3) produce privacy solutions which depend on cooperation neither by large numbers of other motorists nor by trusted third parties, and (4) function in low vehicle densities, notably during the transition period between system initialization and full saturation, (5) provide protection even when applications require frequent and precise location queries, and (6) provide protection over a geographical range beyond a vehicle's wireless communications range and provide protection over measurable and lengthy spans of time. Finally, it presents a new metric for measuring privacy (KDT), an equation to estimate the safety impact of privacy protocols (SSTE), and three new privacy models, Endpoint Protection Zones (EPZ), Privacy by Decoy (PBD) and Random Rotation of Vehicular Trajectory (RRVT).
Zhang, Rong. "Non-orthogonal random waveform based multiuser communications." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/66594/.
Повний текст джерелаCheng, Raymond (Raymond Y. ). "WhanauSIP : a secure peer-to-peer communications platform." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62637.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (p. 61-63).
This thesis presents a novel mechanism for achieving secure and reliable peer-to-peer communications on the Internet. WhanauSIP merges a Sybil-proof distributed hash table with the session initiation protocol (SIP) to enable instant messaging, audio chat, and video conferencing that is resilient to censoring, eavesdropping, and forgery. Performance and security evaluations performed on the PlanetLab network demonstrate that the majority of resource lookups return within five seconds. These results indicate that WhanauSIP delivers practical performance with respect to call session initialization latency for voice-over-IP, without having to rely on any central servers. Furthermore, the tests demonstrated that lookup performance was minimally affected during a Sybil key-clustering attack, illustrating the network's resilience to malicious adversaries. This thesis delivers three software packages for public use: a general Whanau distributed hash table implementation, a WhanauSIP gateway, and a desktop IM/VoIP client.
by Raymond Cheng.
M.Eng.
Gu, Keren M. Eng Massachusetts Institute of Technology. "Enabling supportive communications in decentralized multi-agent teams." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/100597.
Повний текст джерелаThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 33-36).
Supportive communication is an eective collaboration behavior identied in human teams in which team members share information proactively to improve overall team performance. Prior work formulated this objective as the Single-Agent in a Team Decision Problem (SAT-DP) where agents decide whether or not to communicate an unexpected observation during execution time. We extend the SAT-DP denition to include sequential observations, highlighting the need for belief updates of attributed mental models of agents. These updates must be performed effectively and eciently to minimize model divergence and maximize the utility of future communications. In this paper, we present a decision-theoretic solution to the sequential SAT-DP. In our solution, we propose the use of Bayesian plan recognition as one of the methods for reducing divergence in mental models. To achieve computational tractability, we use probabilistic ordered AND/OR trees to compactly represent distributions over possible solutions of hierarchical planning problems. Finally, we evaluate and demonstrate the eectiveness of our proposed approach on decentralized agents collaborating in partially observable environments.
by Keren Gu.
M. Eng.
Erkmen, Baris Ibrahim 1980. "Performance analysis for near-field atmospheric optical communications." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/28469.
Повний текст джерелаIncludes bibliographical references (p. 143-146).
Establishing, high data rate communication links over short distances via fiber-optic cables may prove costly and time consuming, particularly in urban areas. Through-the-air optical communication systems are a reliable and cost effective alternative for establishing high data rate links when the two terminals have a clear line-of-sight. Bad weather conditions, such as rain, snow or fog, degrade performance severely for such links. However, even in clear weather conditions, local refractive index fluctuations in the atmosphere known as atmospheric turbulence, may drastically impair performance. Most optical links are set up to operate in the far-field power transfer regime, in which diffraction spread is the dominant effect on the beam. Therefore, a very small portion of the beam is captured at the receiver, resulting in very weak power coupling between the transmitter and the receiver. However, it is also possible to establish geometries such that the link operates in the near-field regime, where, in absence of turbulence, it is possible to focus the beam onto the receiver with almost perfect power coupling. Work on performance of near-field atmospheric optical communication systems is scarce in existing literature, perhaps due to increased complexity in prescribed models. In this thesis, we analyze error probabilities of binary optical communication links operating in the near-field regime, utilizing on-off keying (OOK) or pulse position modulation (PPM) signaling techniques. We also obtain bounds on the capacity of a single-input, single-output (SISO) atmospheric optical communication link with a coherent-detection receiver operating in the near field.
by Baris Ibrahim Erkmen.
M.Eng.
Wu, Cynara C. "Dynamic resource allocation in CDMA cellular communications systems." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9332.
Повний текст джерелаIncludes bibliographical references (p. 115-117).
Efficient resource utilization is the primary problem in cellular communication systems. In this thesis, we combine the main resource issues for CDMA systems, admission control and power control, in a single framework. The framework uses a formulation that is general enough to incorporate all significant parameters of a system, yet tractable to compute. We formulate the resource allocation problem as a Markov decision process. Due to the enormous size of the state space, applying the traditional solution technique, dynamic programming, is impractical. We therefore consider approximation techniques. As a first step towards simplification, we divide the problem into two subproblems: optimal admission control with heuristic power control and optimal power control with heuristic admission control. We formulate the problem of optimal admission control as a Markov decision process and consider several approximate dynamic programming techniques. We apply these techniques to a simulated system and obtain results that improve significantly upon two commonly used policies, the greedy policy and the reservation policy. We then consider the minimization of the total power transmitted over given discrete sets of available power levels subject to maintaining an acceptable signal quality for each mobile. We develop sequential and distributed iterative algorithms for solving a more general version of this integer programming problem and show that they find the optimal solution in a finite number of iterations which is polynomial in the number of power levels and the number of mobiles.
by Cynara C. Wu.
Ph.D.
Bellei, Francesco. "Superconducting nanowire single photon detectors for infrared communications." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/109008.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 113-120).
The ever-increasing data sharing demands of modern technologies forces scientists to adopt new methods that can surpass the approaching limits of classical physics. Quantum optical communications and information, based on single-photon detectors offer the most promising possibility to reach new levels of data rate and communication security. Superconducting nanowire single-photon detectors (SNSPDs) have already been used in the past to demonstrate new protocols of quantum key distribution and are currently the best single-photon detection technology to enable quantum optical communication. With the goal of creating a global quantum communication network, both optical fiber and free-space optical communication technologies have been explored. In addition, the scientific community started pursuing smaller and cheaper cryogenic solutions to enable the use of SNSPDs on a large scale. In this thesis, I describe the design and development of a cryogenic SNSPD receivers in free-space and optical-fiber configurations for 1550-nm-wavelength. The first configuration was created with the goal of enabling optical communication in the mid-IR. I present future steps to achieve this goal. The second configuration was designed to enable a compact and scalable integration of multiple SNSPD channels in the same system. Our approach has the potential of enabling SNSPD systems with more than 64 channels.
by Francesco Bellei.
Ph. D.
Yates, Roy D. "Methods of multiple access communications with energy detectors." Thesis, Massachusetts Institute of Technology, 1986. http://hdl.handle.net/1721.1/15085.
Повний текст джерелаMICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING
Bibliography: leaf 31.
by Roy D. Yates.
M.S.
Horkley, Benjamin William. "Optical communications with a Geiger mode APD array." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/106009.
Повний текст джерелаThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 47-48).
In this thesis, I evaluated the theoretical and practical performance of a Geiger mode avalanche photodiode (GM-APD, or Geiger mode APD) array for use in optical communications systems. I designed and implemented a test pattern generator, capable of producing waveforms with OOK and PPM modulations at a variety of symbol rates and duty cycles. Using this pattern generator, I tested the receiver properties over a wide range of data rates and illumination levels, and was able to demonstrate the capability for error-free communications in both modulation formats, up to 78.8 Mbps at a sensitivity of 1.8 photons per bit for OOK, and 34.9 Mbps at 2 photons per bit for PPM.
by Benjamin William Horkley.
M. Eng.
Cox, Criston W. "Optimizing bandwidth of tactical communications systems." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Jun%5FCox.pdf.
Повний текст джерелаThesis Advisor(s): William Kemple, John Osmundson. Includes bibliographical references (p. 59-60). Also available online.
Manco, Vega Alejandra. "Early career researchers and PhD students from the social sciences use of Social Networking Sites (SNS) for science communication: an affordances approach." Thesis, Uppsala universitet, Institutionen för informatik och media, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-332028.
Повний текст джерелаMorford, Gary D. "Cooperative Science in a Computer-Mediated Communications Environment Effects on Developing the Integrated Science Process Skills of Secondary Students In Pennsylvania." NSUWorks, 1992. http://nsuworks.nova.edu/gscis_etd/735.
Повний текст джерела