Dissertations / Theses on the topic 'Marine communications'
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Monaghan, Joseph Francis. "Evaluation of digital communications using the Marine Corps Communications Architecture Analysis Model." Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/23661.
Full textThe United States Marine Corps (USMC) is currently evolving to digital communications. This change has created a need for an analysis tool capable of analyzing digital architectures. Traditional communications are being supplemented, and in some cases, replaced by automated systems like the Marine Tactical Command and Control System (MTACCS) Older equipment, the PRC-77 and AN/VRC-12 family of radios, is being replaced by lighter, more efficient equipment like SINCGARS and the Digital Communications Terminal (DCT). Protocols like the Marine Tactical System (MTS) Broadcast Protocol are being implemented to orchestrate this new way of communicating. To assist in the transition, this thesis modified the Marine Corps Communications Architecture Analysis Model (MCCAAM) so it could measure the impact of changing from voice to digital communications. The Fidelity Enhancement Process (FEP) , a comprehensive methodology for model upgrades, was used to systematically modify the model. The model's usefulness is demonstrated in an analysis example by comparing three separate partially digital communications architectures.
Amin, Kruna, Jeffrey Dixon, Kathryn Hunt, Peter Manternach, Brenda Roach, Larry Bochenek, Richard Elgart, Yancy Jeleniewski, Jonathan Reap, and Brian Song. "United States Marine Corps Expeditionary Rifle Squad Communications." Thesis, Monterey, California. Naval Postgraduate School, 2009. http://hdl.handle.net/10945/6942.
Full textEynard, Goulven. "Techniques de synchronisation pour les communications acoustiques sous-marine." Télécom Bretagne, 2009. http://www.theses.fr/2008TELB0094.
Full textAllen, Bernal B. "Meteor burst communications for the U.S. Marine Corps Expeditionary Force." Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/27131.
Full textMeteor Burst Communications (MBC) is explored in relation to its usefulness to Marine Expeditionary Force Communications. A description of the physics and geometry of meteor trail propagation is presented. Communication techniques used to exploit the phenomenon are discussed. Current MBC circuits have operational ranges of 1200 miles without relay and maintain average data rates of 60 to 150 Bits per Second(BPS). MBC is primarily limited by the physics and geometry of the propagation medium and its usefulness is bounded by its slow data rate. Within these boundaries however, several significant use of MBC are identified. Keywords: Theses. (fr)
Long, John M. "Junior officer oral communications in the Navy and Marine Corps." access online version, LEAD access online version, NPS access online version, DTIC, 2004. http://handle.dtic.mil/100.2/ADA424715.
Full textLabat, Joël. "Apport de l'égalisation auto-adaptative en communications acoustiques sous-marines." Brest, 1994. http://www.theses.fr/1994BRES2004.
Full textWest, Michael Brooks. "Object-oriented modelling and analysis of a Marine Corps communications architecture." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/27176.
Full textThe United States Marine Corps (USMC) will be fielding the SINCGARS frequency-hopping radio system during the next 5 years. There will be units within the Corps during the transition period in which both the conventional fixed-frequency radio and the SINCGARS radio will be employed in the same area at the same time. The Marine Corps Communications Architecture Analysis Model (MCCAAM) presented in this thesis will give Marine Corps decision makers, analysts, and communications officers the ability to quantify the effectiveness of alternative tactical radio system configurations within a given Marine Air-Ground Task Force (MAGTF) environment. Using a unique traffic workload paradigm to generate realistic message traffic, this object-oriented simulation model assesses the overall performance of a given architecture with a specified mix of fixed-frequency and frequency-hopping radios through a penalty accrual process or through aggregating traditional communications MOEs. USMC decision makers and communications officers can use the results of the system performance rankings and associated sensitivity trade-off analysis to determine where best to allocate the new frequency hopping radios, as they become available, in order to maximize the overall FM communications performance of a given MAGTF.
Bonnifay, Sandrine. "Séparation de sources appliquée aux communications sous-marines." Brest, 2001. http://www.theses.fr/2001BRES2020.
Full textKing, Zaffrenarda L. "An analysis of Marine Corps beyond line of sight wideband satellite communications requirements." Thesis, Monterey, California. Naval Postgraduate School, 2010. http://hdl.handle.net/10945/5152.
Full textSatellite communications are critical to Marine Corps command and control. Capabilities in the domain of beyond line of sight systems, such as wideband SATCOM, must periodically be assessed for alignment with relevant strategy, policy, and doctrinal publications. The National Security Strategy and other documents are periodically updated to provide direction to the U.S. Armed Forces. This thesis provides an analysis of a broad range of publications that extend from national level strategy documents down to service level doctrinal publications that specifically address how the Marine Corps conducts military operations. The focus is to identify how beyond LOS SATCOM systems can support the key tenets of the NSS and USMC doctrine. The analysis forms the basis for an assessment of current USMC SATCOM systems and capabilities, followed by considerations for future USMC SATCOM systems and capabilities. SATCOM provides capacity, range, and coverage that allow expeditionary forces such as the Marine Corps to operate anywhere, anytime. Beyond LOS capabilities allow us to mass effects from fewer, more widely dispersed forces. This thesis provides an analytical foundation to help shape future USMC SATCOM operational concepts. It may then help shape USMC SATCOM requirements that must be satisfied by new systems.
Schneider, Toby Edwin. "Advances in integrating autonomy with acoustic communications for intelligent networks of marine robots." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/79162.
Full textThis 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 (p. 151-161).
Autonomous marine vehicles are increasingly used in clusters for an array of oceanographic tasks. The effectiveness of this collaboration is often limited by communications: throughput, latency, and ease of reconfiguration. This thesis argues that improved communication on intelligent marine robotic agents can be gained from acting on knowledge gained by improved awareness of the physical acoustic link and higher network layers by the AUV's decision making software. This thesis presents a modular acoustic networking framework, realized through a C++ library called goby-acomms, to provide collaborating underwater vehicles with an efficient short-range single-hop network. goby-acomms is comprised of four components that provide: 1) losslessly compressed encoding of short messages; 2) a set of message queues that dynamically prioritize messages based both on overall importance and time sensitivity; 3) Time Division Multiple Access (TDMA) Medium Access Control (MAC) with automatic discovery; and 4) an abstract acoustic modem driver. Building on this networking framework, two approaches that use the vehicle's "intelligence" to improve communications are presented. The first is a "non-disruptive" approach which is a novel technique for using state observers in conjunction with an entropy source encoder to enable highly compressed telemetry of autonomous underwater vehicle (AUV) position vectors. This system was analyzed on experimental data and implemented on a fielded vehicle. Using an adaptive probability distribution in combination with either of two state observer models, greater than 90% compression, relative to a 32-bit integer baseline, was achieved. The second approach is "disruptive," as it changes the vehicle's course to effect an improvement in the communications channel. A hybrid data- and model-based autonomous environmental adaptation framework is presented which allows autonomous underwater vehicles (AUVs) with acoustic sensors to follow a path which optimizes their ability to maintain connectivity with an acoustic contact for optimal sensing or communication.
by Toby Edwin Schneider.
Ph.D.
Mariotte, Hubert. "Caractérisation d'un canal non stationnaire et sélectif : Application aux communications numériques acoustiques sous-marines." Brest, 1995. http://www.theses.fr/1995BRES2018.
Full textParker, Michael A. Arp Lance T. "Scalability study of wireless tactical communications in support of a Marine Corps Expeditionary Brigade." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA379706.
Full textThesis advisors: Osmundson, John ; Kemple, William. "June 2000." Includes bibliographical references (p. 213). Also available online.
Foster, Joseph D. "Swarming unmanned aerial vehicles (UAVs): extending Marine aviation ground task force communications using UAVs." Thesis, Monterey, California: Naval Postgraduate School, 2014. http://hdl.handle.net/10945/44564.
Full textApproved for public release; distribution is unlimited
Reissued 2 Mar 2015 to correct degree earned
Technological advances and research are pushing the application of unmanned vehicles in exciting directions. This thesis emphasis is on cost estimation for a new unmanned aerial vehicle (UAV) with swarm applications. The new swarm UAV theoretical can be designed to emulate the current unmanned aerial system (UAS) mission, and expand upon the communication relay mission. Small UASs have a line-of-sight capability limitation that leaves room for improvement. The UAVs organic to the U.S. Marine Corps (USMC) are the primary focus for this analysis because organic USMC UAVs are habitually small UAVs. The analysis will determine a rough cost estimation range for a future AV with new technology. Based on the adaptation of networking topologies and research, the communication relay mission is a feasible capability to Peruse in future swarm UAVs. The analysis suggests that a swarm UAV is comparable in cost to legacy UAVs currently in service in the USMC.
Parker, Michael A., and Lance T. Arp. "Scalability study of wireless tactical communications in support of a Marine Corps Expeditionary Brigade." Thesis, Monterey, California. Naval Postgraduate School, 2000. http://hdl.handle.net/10945/7784.
Full textThis thesis reports the findings of a simulation modeling the communications architecture used during Major System Demonstrations 1 (MSD-1) of the Extended Liftoral Battlespace (ELB) Advanced Concept Technology Demonstration (ACTD) and a suitable architecture for a large-scale battlespace. The simulation was accomplished with the use of a leading edge simulation tool, EXTENDTM, and the specifications inherent to wireless communications. Specifically, EXTEND was used to replicate the protocols that are inherent within the WaveLAN and VRC-99A systems. A feasible sized architecture was modeled utilizing scaling techniques, which simulated the operation of a Marine Expeditionary Brigade (MEB), covering a 2OOX2OO mile wireless tactical battlespace. This thesis further investigates the validity of a completely wireless tactical network versus the additional use of ground relays. This thesis demonstrates that the wireless tactical battlespace is scalable to satisfy the requirements of a Marine Expeditionary Brigade. Lastly, this thesis demonstrates the effects of an all WaveLAN architecture
Youcef, Abdelhakim. "Amélioration des performances du traitement des interférences dans le domaine fréquentiel pour les communications acoustiques sous marines." Télécom Bretagne, 2013. http://www.telecom-bretagne.eu/publications/publication.php?idpublication=14141.
Full textUnderwater acoustic (UWA) communications allow wireless transmission between the surface and the bottom of a subsea environment based on acoustic waves. The wireless acoustic link reduces the physical infrastructure cost compared to the cable-based underwater communications. However, underwater acoustic channel imposes severe degradations on the transmitted signal. Its propagation characteristics are widely different from those of the radio channel. The multipath propagation caused by multiple reflections on the bottom and the surface, causes intersymbol interference (ISI) which must be compensated at the receiver. Furthermore, by the movement of the transmitting and receiving platforms, the UWA channel is time-variant yielding Doppler spread which induces a compression/expansion phenomenon of the symbol duration, associated to a frequency shift of the signal spectrum. The objective of this thesis is to propose low-complexity communication techniques in the UWA channel, in order to remove interferences while ensuring energy-efficient transmission link. The reduction in complexity is achieved by treating interferences in the frequency-domain which minimizes the energy consumption of the transmission system. We first propose adaptive frequency-domain equalization techniques in a decision directed mode, in order to remove ISI and track the time-variation in the UWA channel. Then, we propose a single-user SC-FDMA transmission scheme with a uniform distributed subcarrier allocation and using frequency-domain interval guards, in order to improve the robustness of the receiver against the Doppler effect in the UWA channel. Finally, we propose an adaptive frequency-domain turbo equalizer using iterative receiver, which allows to significantly reduce the bit error rate over iterations. Note that multiple-input receiver is considered in order to benefit from the diversity combining gain to achieve a higher signal to noise ratio (SNR). Furthermore, equalization is optimized jointly with phase synchronization to compensate residual frequency offsets at the equalizer output. The performance of the proposed solutions are measured over real time-variant underwater acoustic channel in the Atlantic Ocean
Mokhtari, Kambiz. "Advanced risk management in offshore terminals and marine ports." Thesis, Liverpool John Moores University, 2011. http://researchonline.ljmu.ac.uk/6094/.
Full textPottier, Antony. "Méthodes décentralisées d'allocation des ressources dans le canal d'interférence acoustique sous-marin." Thesis, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2018. http://www.theses.fr/2018IMTA0095/document.
Full textUnderwater acoustic waves are used by many systems and biologic organisms to communicate, navigate or infer information about the environment. Future developments of human maritime activities imply an increase of the number of active acoustic sources in the oceans. The underwater environment is therefore shared by many heterogeneous sources (sonars, modems, marine mammals, ...) competing involuntarily for using the physical resources offered by the communication channel.The goal of this thesis is to provide solutions allowing autonomous and decentralized adaptation of the transmission strategies of underwater acoustic communication systems, according to the environment. To some extent, this work deals with topics that are closely related to what has motivated the first researches on cognitive radio systems. However, the specific properties of the underwater environment, the heterogeneity of interfering acoustic sources, and the absence of communication standards rise new difficulties
YE, Zi. "Traitement statistique de l'information et du signal pour l'internet des objets sous-marins." Thesis, Institut polytechnique de Paris, 2021. https://tel.archives-ouvertes.fr/tel-03179373.
Full textThere has been recently a large development of human activities associated to the ocean world, where no standard has emerged for the Internet of Things (IoT) linked to marine autonomous objects. Though it has a limited bandwidth, the acoustic wave is the only way to communicate over average to large distances and it is thus used by many underwater systems to communicate, navigate, or infer information about the environment. This led to a high demand for wireless networks that require both spectral efficiency and energy efficiency with the associated low-complexity algorithms. Therefore, in this Ph.D. thesis, we proposed several original solutions to face this challenge.Indeed, due to the inherent Signal Space Diversity (SSD), rotated constellations allow better theoretical performance than conventional constellations with no spectral spoilage. We review the structural properties of uniformly projected rotated M-QAM constellations, so as to propose a low complexity soft demapping technique for fading channels. Then, we present an original blind technique for the reduction of the PAPR for OFDM systems using the rotated constellations with SSD. In order to reduce the complexity of blind decoding for this technique, we again rely on the properties of uniformly projected M-QAM rotated constellations to design a low-complexity estimator. Moreover, to face the selectivity of the acoustic channel, we suggest a sparse adaptive turbo detector with only a few taps to be updated in order to lower down the complexity burden. Finally, we have proposed an original self-optimized algorithm for which the step-sizes of both the equalizer and the phase estimator are updated adaptively and assisted by soft-information in an iterative manner, so as to meet the requirement of fast convergence and low MSE over time-varying channels
Thome, Geoffrey D. "U.S. Marine specific software interoperability requirements of the AFATDS and IOS software suites." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02sep%5FThome.pdf.
Full textThesis advisor(s): John Osmundson, Richard Riehle. Includes bibliographical references (p. 119-123). Also available online.
Rautio, Leonard J. "Study of standards used to screen recruits for assignment to the communications field in the U.S. Marine Corps." Thesis, Monterey, California. Naval Postgraduate School, 2011. http://hdl.handle.net/10945/5791.
Full textThis thesis examines the relationship between ASVAB composite scores and success at the 06 Occupational Field Schools. The author analyzes Marine Corps personnel data obtained from the Total Force Data Warehouse. The range of the data studied covers a period from fiscal year 2006 through fiscal year 2009, including 9,921 Marines. Several multivariate regression models are estimated to determine the effects of ASVAB composites and other measures of performance on success at the Communications Schools. Results indicate that the Electronics aptitude test composite has a significant positive effect on success at the Communications Schools. Additional variables that have a positive effect on the probability of success are being married, Hispanic, American Indian, the Clerical aptitude test composite score, enlisting in fiscal year 2007 (compared to 2009), and attending 0612 or 0651 MOS schools (when compared to 0621). Factors that had a negative effect on success include being female, having fewer than 12 years of education, and attending 0613, 0614, 0622, 0623, 0628, or 0656 MOS schools (when compared to 0621). Further research is recommended to examine additional factors and to refine the variable for years of education.
Travis, William L. "The economic and risk constraints in the feasibility analysis of wireless communications in Marine Corps Combat Operation Centers." Thesis, Monterey, California: Naval Postgraduate School, 2013. http://hdl.handle.net/10945/37735.
Full textThis thesis will provide Marine Corps acquisitions and communications personnel a general understanding of wireless communications capabilities, financial feasibility, benefits and the risks of implementing a wireless solution into the current existing communications infrastructure in particular, the Combat Operations Center (COC) CapSet models already employed and deployed throughout the Marine Corps Air Ground Task Force. The content of this thesis is of an unclassified nature. This thesis is intended to serve as a reference for acquisitions or communications personnel dealing with the acquisition, procurement, planning, and implementation of wireless technologies in the Marine Corps, so that they will be able to intelligently articulate the financial feasibility, benefits, and risks of adopting or implementing a wireless solution to the Marine Corps Enterprise Network and COC infrastructure, and make informed decisions on the subject.
Simmons, Randall J. Curran Christopher C. "Mesh networks within a distributed operations framework utilizing IP based radios." Monterey, Calif. : Naval Postgraduate School, 2007. http://bosun.nps.edu/uhtbin/hyperion-image.exe/07Sep%5FSimmons.pdf.
Full textThesis Advisor(s): Bordetsky, Alex. "September 2007." Description based on title screen as viewed on Oct. 22, 2007. Includes bibliographical references (p. 93-95). Also available in print.
Saintier, David. "Caractérisation numérique d’antennes VLF-LF en environnement réel." Thesis, Université Côte d'Azur (ComUE), 2018. http://www.theses.fr/2018AZUR4081/document.
Full textSubmarine communications are the main usage of the very low frequency (VLF). This frequency band allows to radiate up to a few tens meter of depth and to a very long distance. Antennas for such telecommunications are necessarily small in regard to the wavelength. However, these structures are composed of hundred meters of thin metallic cables and their locations are often chosen for their dielectric characteristics or the structural advantage provided by the relief. To evaluate such antennas, we propose to use a home-made software, based on the TLM method. Such technique can be efficient for studying wide band electromagnetic problems in complex dielectric environment. Then we have improved the TLM Thin Wire model and we have evaluated its performances in realistic environment. In this document, we present our work and its validation by comparing our results to those obtained with the commercial software FEKO, based on the MoM, considered as the most suitable technique for this kind of problem. A solution assuring a good accuracy of the model for an arbitrary orientation of the Thine Wire in the 3D cartesian grid was proposed. We have also specified the limitations of the bent wire and the wires junction. In addition, we have studied the interaction between the wire and inhomogeneous media. This is an ambitious problem for which we brought some elements of answer but which remains a challenge. Finally, we have tested our software on some realistic antenna systems. The simulations of a valley span T antennas system allow to understand the functioning of such radiating structure and to show the interest of our method. The computation times are significantly lower with the TLM method than with FEKO to deal with antennas above such complex ground. However, the simulations of a Trideco antenna with aerial or buried radial ground plane showed the actual limitations of the TLM software which remains handicapped by an insufficient accuracy of the wires junction model and the inhomogeneous media interactions
Wappelhorst, Annika. "In the Net : The Visual and Verbal Rhetoric of the Campaign “Operation Dolphin Bycatch” by Sea Shepherd France." Thesis, Jönköping University, HLK, Medie- och kommunikationsvetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-54617.
Full textL’organisation de conservation du milieu marin Sea Shepherd est surtout connue pour ses méthodes d’action directe radicale, par exemple contre le braconnage des baleines. Ce mémoire de master examine la campagne « Opération Dolphin Bycatch », qui est coordonnée par la branche française de l’ONG, à travers une analyse multimodale du discours et des entretiens avec des bénévoles de Sea Shepherd France (SSF). Les dauphins sont l’espèce porte-drapeau de la campagne. Ils permettent ainsi à SSF de critiquer les méthodes de pêche non sélectives qui provoquent la mort accidentelle de dauphins dans le Golfe de Gascogne. Avec des expressions provenant des champs lexicaux de la guerre et de la religion, SSF dépeint le gouvernement français et la plupart des pêcheurs comme poursuivant des valeurs lucratives égoïstes à l’encontre du bien-être des dauphins. Il s’avère que SSF se positionne comme radicale dans sa vision du monde plus que dans ses approches. Sa philosophie biocentrée de l’environnement contredit l’anthropocentrisme qui domine la société. Dans cette campagne, l’ONG utilise des tactiques « extérieures », c’est-à-dire qu’elle exerce une pression sur les décideurs politiques français avec des images de prises accessoires de dauphins et prend soin de maintenir une légitimité internationale en restant dans un cadre légal.
Die Meeresschutzorganisation Sea Shepherd ist vor allem für ihre radikalen „Direct Action“-Methoden bekannt, beispielsweise gegen Wal-Wilderei. Diese Arbeit untersucht die Kampagne „Operation Dolphin Bycatch“, die vom französischen Zweig der NGO koordiniert wird, durch multimodale Diskursanalyse und Interviews mit Mitgliedern von Sea Shepherd Frankreich (SSF). Delfine dienen als Flaggschiff-Art der Kampagne. Sie ermöglichen es SSF, die nicht-selektiven Fischereimethoden zu kritisieren, die das versehentliche Töten von Delfinen im Golf von Biskaya verursachen. Mit Begriffen aus Krieg und Religion schreibt SSF der französischen Regierung und den meisten Fischerleuten eigennützige Profitinteressen zu und stellt sie als Feinde des Wohlergehens der Delfine dar. Es zeigt sich, dass SSF eher in ihrer Weltanschauung als in ihren Ansätzen eine radikale Position beansprucht. Ihre biozentrische Umwelt-Philosophie steht im Widerspruch zum Anthropozentrismus, der in der Gesellschaft vorherrscht. Bei dieser Kampagne bedient sich die NGO „Außenseiter“-Taktiken: Sie übt Druck auf französische Politiker*innen aus, indem sie Filmaufnahmen von Delfin-Beifang zeigt, und achtet durch das Einhalten gesetzlicher Vorgaben darauf, internationale Legitimität zu wahren.
Sauvadet, Anne-Laure. "Interactions entre ciliés et métazoaires dans deux environnements marins contrastés : les sources hydrothermales et les sédiments anoxiques." Paris 6, 2010. http://www.sb-roscoff.fr/images/stories/sbr/Edition-communication/theses/these_sauvadet.pdf.
Full textPhillips, Bradley W. "Beyond the space cadre." Quantico, VA : Marine Corps Command and Staff College, 2008. http://handle.dtic.mil/100.2/ADA490929.
Full textLong, John M. "Junior Officer oral communication in the Navy and Marine Corps." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Jun%5FLong.pdf.
Full textThesis advisor(s): Gail Fann Thomas, Anne-Marie Drew. Includes bibliographical references (p. 95-99). Also available online.
Justice, Barry D. "A scheduling model for the U.S. Marine Corps Communication-Electronics School." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from the National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA274958.
Full textThesis advisor(s): Brown, Gerald Gerard ; Wood, R. Kevin. "September 1993." Includes bibliographical references. Also available online.
Campbell, Maria Shauna. "Fisheries, marine conservation, marine renewable energy and displacement : a fresh approach." Thesis, University of Plymouth, 2017. http://hdl.handle.net/10026.1/8336.
Full textJefferson, Rebecca Louise. "Communicating marine environmental health : connecting science, social and policy values." Thesis, University of Plymouth, 2010. http://hdl.handle.net/10026.1/2666.
Full textJohansson, Björn G. "Chemical Communication and Mate Choice : Investigations into the Meaning of a Fruit Fly Pheromone." Doctoral thesis, Uppsala University, Department of Ecology and Evolution, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4840.
Full textChemical signals are the most widely used form of sexual communication throughout the living world. However, there is in general little knowledge about what these signals actually communicate. The role of chemical signals, i.e. pheromones, in sexual behaviour has traditionally been seen as restricted to mate attraction and species recognition. This thesis reviews the evidence for pheromones as indicators of mate quality, and then investigates three important factors for mate quality signals – individual variation, heritability and cost – by using the male pheromone of the lekking fruit fly Drosophila grimshawi as a model.
The experiments presented indicate that the pheromone of D. grimshawi has multiple functions, and that these functions vary with social context. Thus, with regard to females, the pheromone seems to act mainly as a species/mate recognition signal, since females show little preference for the amount of pheromone deposited by a male. Moreover, males invest less in pheromone production when subjected to females as compared to when subjected to rival males. However, the pheromone seems to be costly in production since males that invest much in pheromone deposition has a shorter lifespan. This suggests a function for the pheromone in male-male interactions. Males can distinguish their own pheromone depositions from those of a strange male, and also discriminate between pheromone depositions from one and two strange males. This might give them the ability to assess the size of a lek and the competitive capacities of rivals, information that should be useful when optimizing sexual behaviour.
In conclusion, the pheromone seems to act as an honest mate/competitor quality signal in some social contexts, and as a non-costly species/mate recognition signal in other. In addition, I show for the first time that a chemical signal has differential fitness costs, and that an insect is able to distinguish between individual odour signatures.
Noel, Allen L. "Performance study of a Marine Expeditionary Force radio system." Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA238486.
Full textThesis Advisor(s): Ha, Tri T. Second Reader: Myers, Glen A. "September 1990." Description based on title screen as viewed on March 22, 2010. DTIC Identifier(s): Marine Corps Equipment, Theses. Author(s) subject terms: VHF radio, HF radio, Single channel radio, Circuit switching, Voice Communication, Engset distribution. Includes bibliographical references (p. 63). Also available in print.
Wierucka, Kaja. "Multimodal mother-offspring recognition in the Australian sea lion, Neophoca cinerea." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS432.
Full textRecognition plays an important role in animal communication systems and individuals often employ different sensory modalities to enact this activity. Although recognition has been widely investigated, especially for mother-offspring interactions, there is a dearth of information about multimodal recognition and the relative importance and interactions of various sensory cues. In this thesis, I explored multimodal communication in a colonial mammal – the Australian sea lion (Neophoca cinerea). Communication during mother-pup reunions is known to be multimodal in this species, yet the underlying processes of olfactory and visual recognition, as well as the interactions between acoustic, visual and olfactory cues remain unclear. Through chemical analyses, I determined whether chemical profiles differ among sex and age classes, colonies, and body regions of animals. Chemical similarities between mothers and pups indicate that phenotype matching may be used by Australian sea lions for olfactory recognition. I examined the role of visual cues in mother-pup recognition and found that age-specific visual cues assist mothers to refine their search for their offspring in the colony. Pups are capable of distinguishing various visual cues that can be used in the assessment of conspecifics. Having provided baseline information about the role of sensory cues in isolation, I determined how acoustic, olfactory, and visual cues are used in a synergistic way to ensure accurate mutual recognition and then interpreted the results using a cost-benefit perspective to disentangle the evolutionary pressures on each component of this communication system. I showed that although cues have the ability to convey given information in isolation, their role may be different when other sensory cues are present. Furthermore, there is a mutual dependency in the communication system, where the limitations imposed on one participant of the dyad affect cue use by the other. These findings contribute to a better understanding of mammal mother-offspring recognition and communication mechanisms in vertebrates
Moshiri, Hesam. "Implementation of a Generic Gateway as a Multipurpose Communication Node." Thesis, Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-24840.
Full textBrossier, Jean-Marc. "Egalisation adaptative et estimation de phase : application aux communications sous-marines." Grenoble INPG, 1992. http://www.theses.fr/1992INPG0124.
Full textBird, Corey D. "Investigation and suppression of multipath communication signals with applications to a marine environment." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq23119.pdf.
Full textNeu, Charles R. Davenport Jon Smith William R. "U.S. Marine communication-electronics school training process discrete event simulation and lean options /." Monterey, Calif. : Naval Postgraduate School, 2007. http://bosun.nps.edu/uhtbin/hyperion-image.exe/07Dec%5FNeu%5FMBA.pdf.
Full textAdvisor(s): Heath, Susan ; Simon, Cary ; Summers, Don. "December 2007." "MBA professional report"--Cover. Description based on title screen as viewed on January 10, 2008. Includes bibliographical references (p. 91-94). Also available in print.
Neu, Charles R., William R. Smith, and Jon Davenport. "U.S. Marine communication-electronics school training process: discrete event simulation and lean options." Thesis, Monterey, California. Naval Postgraduate School, 2007. http://hdl.handle.net/10945/10217.
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This paper uses discrete-event simulation modeling, inventory-reduction, and process improvement concepts to identify and analyze possibilities for improving the training continuum at the Marine Corps Communication-Electronics School (MCCES), specifically in terms of reducing adverse effects of lost-time spent in the Marines Awaiting Training (MAT) Platoon queue. Every possible improvement that the local commander could make without spending any capital was tested using the Process Analyzer Function (PAN) in Arena. The researchers also tested increasing the number of instructors up to the quantity authorized. Potential effects on the MCCES operating budget are offered, i.e., a cost-benefit analysis based on average salaries was conducted with recommendations for making the training system more efficient while examining potential changes to reduce costs. The premise of the study is that Marines Awaiting Training (MAT) are potential warfighters not gaining value-added training nor benefiting the Marine Corps when waiting in a queue to begin Military Occupational Specialty (MOS) training, i.e., adversely affecting Fleet Marine Forces operational readiness. The study coincides with current emphasis on reducing the Training, Transients, Patients, and Prisoners (T2P2) account. The researchers determined that changing from the present MCCES process of scheduling classes to an on-demand scheduling method, and, in some MOSs, changes to the minimum and maximum class sizes and the number of instructors, would result in a reduction in the average days spent in MAT and the average number of Marines in MAT. By utilizing all recommendations, the researchers identified a potential value savings in terms of salary of $1 1.6 million and a potential cost savings to the barracks and base support costs of $1 .9 million.
Lyonnet, Bastien. "Diversité spatiale et compensation Doppler en communication sous-marine sur signaux large-bandes." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00664710.
Full textOGOR, MARIELLE. "Communications electromagnetiques sous-marines par ondes laterales dans la gamme elf/vlf." Nice, 1998. http://www.theses.fr/1998NICE5236.
Full textBishop, John. "Application of radio-navigation systems to the remote tracking of marine animals." Thesis, Bangor University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360999.
Full textParameshwara, Vinayak Kota. "ENHANCEMENT OF NORTH CAROLINA AGRICULTURAL AUTOMATED WEATHER NETWORK AND DEVELOPMENT OF ADVANCED COMMUNICATION, DATA ACQUISITION, AND DISSEMINATION SYSTEMS." NCSU, 2000. http://www.lib.ncsu.edu/theses/available/etd-20000606-114101.
Full textAgNET is a weather network, which collects surface and subsurface meteorological data in North Carolina. Each AgNet weather station measures a variety of weather parameters such as air temperature, relative humidity, wind speed and direction, barometric pressure, solar radiation, photosynthetically active radiation, soil temperature, soil moisture and precipitation. The station summarizes the above parameters for every hour and stores them in its local memory. Currently the data collected over the entire day are then transferred to a central server through phone lines. The data collected at the central server are published on the Internet and disseminated by other means as well. The purpose of this thesis is to describe the modernization of the AgNet weather network by making the network conform to standards, implement a uniform sensor configuration and improve the methods of data acquisition, dissemination and display of weather data.Since phone-based communication is not economical for real time data transfers other techniques such as Radio Frequency (RF) communication and satellite based communication were evaluated. RF communication was the most promising communication technique. Since RF is limited by distance, a combination of RF and Internet was designed. In this type of communication, data are transmitted from the weather station and received by a base station that is on the Internet. The received data are then forwarded to a central server at the State Climate Office where they are archived and disseminated. A successful test was conducted as proof of concept between Lake Wheeler road Field laboratory site, Raleigh and Varsity Laboratory, NC State University.Since every system has inherent noise, data collected at each station have to go through different quality control algorithms to insure data quality. Different Quality Control (QC) algorithms were implemented which are discussed in the thesis.
Hamza, Tasnim. "Communications optiques sous-marines : transmission longue-portée haut débit et analyse des performances." Thesis, Ecole centrale de Marseille, 2017. http://www.theses.fr/2017ECDM0002.
Full textToday we are witnessing a growing need to high-rate data transmission in underwater missions in a wide range of application areas. Within this context, traditional cable- or fiber-based communications imply costly deployments with very limited flexibility, and the conventional acoustic communications offer very low operational performance. Recently, with the development of small and low-cost optoelectronic components and devices, it has become feasible to realize small and compact wireless optical communication transceivers providing unprecedentedly high transmission rates and energy efficiency. However, there still remain several shortcomings of this technology, in particular to attain high data rates over relatively long communication ranges. In order to overcome some of these limitations, this PhD thesis considers the use of advanced optoelectronic components and signal processing techniques in order to improve the performance of underwater wireless optical communication (UWOC) links. In this view, after studying the effect of solar background noise on the performance of these links, we investigate the use of the recent promising Silicon photo-multipliers (SiPMs) in UWOC receivers and study the corresponding system performance in different conditions of water turbidity. We also propose efficient transmission solutions, mainly based on pulse amplitude modulation and frequency domain equalization in order to surpass the bandwidth limitation of the emitters and SiPMs to allow high rate data transmission. The benefits of the proposed solutions are further validated through experimental measurements
Woodward, John A. "A proposed architecture for communication planning in support of Marine Air Ground Task Force operations." Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/26184.
Full textPsillas, Christopher F. "A preliminary economic evaluation of Marine Corps acquisition practices: UHF satellite communication ground terminal acquisitions." Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/27220.
Full textBen, Rhouma Ons. "Diversité en émission dans un contexte de communication autodidacte." Télécom Bretagne, 2007. http://www.theses.fr/2007TELB0037.
Full textAlayrangues, Pierre. "Madame du deffand epistoliere ou l'impossible communication." Paris 4, 1986. http://www.theses.fr/1986PA040042.
Full textFor madame du deffand, letter-writing is the thorough means of an endless selfinvestigation (or quest), of an exerlasting wondering about one's existence which reminds of a personal diary, of "essays" such as montaigne wrote them. She felt alien to her background, her world, her age and even to her own self all through her life ; she was disgusted with everything (first and foremost with her own self) she tried to turn her pen friends into the auxiliaries of this quest for living through disappointing attempts at identification (such as highly idealistic parents'images, voltaire's and madame de choiseul's out of reach gifts), at adoption (as a matter of fact, attempts at shaping up beings that reflect her expectation, with julie de lespinasse's and d'alembert's filial relation-ships), at last at self-surrender in a thwarted relationship (which meant to be a loving one) with the other one perfectly embodied in walpole. As a matter of fact, blocked up by an ineradicable narcissism, a definitely pathological, chronical melancholy mania, she couldn't adjust herself to the outside world that set in action against the free expansion of her ego, its standing value or its lack of meaning. This kind of spiritual biography can be read as a deep, emotional frustration which leads to a "value" crisis (or upheaval), to a thorough change of the sensitivity, to a giddy feeling when living has to be faced, the risk of which must be run, alone, in a world doesn't provide any support because it keeps vanishing and because self growth can only be achieved from an empty span of time
Fangbemi, Kossivi Agbessi. "Collaborative control of wave glider platforms - Local Communication and Sea State Estimation." Master's thesis, Faculty of Engineering and the Built Environment, 2019. http://hdl.handle.net/11427/31411.
Full textStoffle, Richard W., and Jessica Minnis. "Resilience at Risk: Epistemological and Social Construction Barriers to Risk Communication." Journal of Risk Research, 2008. http://hdl.handle.net/10150/292434.
Full textNachabe, Yasmine. "Marie al-Khazen's photographs of the 1920s and 1930s." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=107742.
Full textMarie al-Khazen est une photographe libanaise qui vécut entre 1899 et 1983. La plupart de ses photos furent prises dans les années vingt et trente dans la région de Zgharta au Nord du Liban. Ces photos font partie de la collection de Mohsen Yammine, un collectionneur libanais. Elles sont actuellement conservées dans les archives de la Fondation de l'image Arabe à Beyrouth et sont disponibles en ligne sur le site internet de la Fondation. Le corpus d'al-Khazen est constitué d'un ensemble de photographies captivantes qui représentent le quotidien de sa famille et de ses amis à Zgharta. Al-Khazen saisissait son milieu social grâce à son appareil photo. Néanmoins, elle ne se contentait pas de documenter ses excursions touristiques au Liban; elle explorait également les capacités techniques de son appareil photo en inventant des scènes photographiques et en manipulant les ombres dans l'espace photographique. Au travers de ses photos on retrouve les effets surréalistes qu'elle créait – peut-être intentionnellement – en faisant des tirages de deux négatifs superposés. Dans le cadre de ces images, on retrouve des bédouins et des Européens, des paysans et des bourgeois, des femmes et des hommes se partageant le même espace. La plupart des photos de Marie al-Khazen évoquent les destins de femmes indépendantes et engagées. Ces photos sont chargées de symboles qui suggèrent une représentation de la femme émancipée. A travers le corpus d'al-Khazen, des femmes apparaissent en train de fumer des cigarettes et de conduire des automobiles. On retrouve également des femmes qui accompagnaient les hommes dans leurs excursions de chasse. Ces photos semblent incompatibles avec la façon dont les femmes étaient représentées dans la presse des années vingt au Moyen Orient où les femmes, en général, évitaient de se montrer dans des endroits publiques. Je propose une lecture qui articule la façon dont al-Khazen a utilisé l'espace photographique pour manifester sa vision de la nouvelle femme: la femme moderne comme celle décrite par Tani Barlow et ses collègues dans The Modern Girl Around the World. Cette anthologie représente la "modern girl" qui, selon Barlow et ses collègues, "disregards the roles of dutiful daughter, wife and mother," en recherchant une émancipation sexuelle, économique et politique.Les photos d'al-Khazen m'incitent à interroger de façons multiples la représentation de la femininité et la masculinité à travers le comportement, le raisonnement, et les activités des femmes et des hommes dans ces photographies. Ces questions s'adressent à la sociologie de l'identité sexuelle et se proposent d'analyser la façon dont cette identité est évoquée dans les photos de Marie al-Khazen.