Dissertations / Theses on the topic 'Communcation'
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Axehill, Daniel. "Integer quadratic programming for control and communcation /." Linköping : Department of Electrical Engineering, Linköping University, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-10642.
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Demirci, Ali. "Performance Evaluation Of Flexray Networks For In-vehicle Communcation." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12611239/index.pdf.
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The increasing use of electronic components in today&rsquos automobiles demands more powerful in-vehicle network communication protocols. FlexRay protocol, which is expected be the de-facto standard in the near future, is a deterministic, fault tolerant and fast protocol designed for in vehicle communication. In the near future, safety critical X-by-Wire applications will be available in the automobiles and FlexRay networks can be used to provide communication for the Electronic Control Units (ECUs) that perform related functions of X-by-Wire applications. In this thesis the performance of the FlexRay networks with various communication scenarios is evaluated in a real time environment and the results are presented. Communication scenarios investigate both static and dynamic segment of the FlexRay and allow evaluating the capabilities of the protocol. Several performance metrics such as utilization, static slot allocation, jitter are defined for the evaluation of the results.
3
Jones, Christopher Richard. "Context, content and cooperation : an ethnographic study of collaborative learning online." Thesis, Manchester Metropolitan University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267538.
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Pringle, Gwendolyn. "COMPARING ACQUISITION RATES OF VOCAL MANDS IN CHILDREN WITH AUTISM: VOCAL ALONE vs. MODIFIED TOTAL COMMUNCATION." Master's thesis, Temple University Libraries, 2018. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/530761.
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Applied Behavioral AnalysisM.S.Ed.
Total communication (TC) involves the teaching of a manual sign language response while simultaneously presenting the corresponding vocal stimulus. TC procedures have been shown to increase the acquisition of vocal responding for children with autism spectrum disorder (ASD). This study attempted to systematically replicate the findings in Carbone et al. (2006), who found TC training to have a superior advantage over vocal alone (VA) procedures in the acquisition of vocal tacts. An alternating treatments design with initial baseline was implemented to compare two conditions in teaching vocal mands to children with ASD. In the VA condition, the researcher presented a vocal prompt to evoke vocal behavior. In the modified total communication (MTC) condition, the researcher presented the vocal prompt along with the corresponding manual sign. Participants were only required to vocally respond to produce reinforcement in both conditions. Sign language responses also produced reinforcement. Four children diagnosed with ASD and varying speech delays participated in this study. A multiple stimulus without replacement (MSWO) preference assessment (DeLeon & Iwata, 1996) was used to identify each participants’ preference to 15- 20 different stimuli. Following baseline, one to two highly preferred target stimuli were assigned to each condition. Four sessions were conducted during the intervention phase, two sessions of the VA condition and two sessions of the MTC condition. Conditions were counterbalanced by alternating each session with no more than two consecutive sessions of the same condition introduced first to control for sequential confounds. Sessions included three trial presentations of each stimulus. Sessions took place one to three times a week. Previous research suggested MTC to have an advantage in higher acquisition rates of vocal responses than the VA condition. The study outcome led to mixed results; three participants demonstrated slightly better acquisition of vocal mands in the MTC condition compared to the VA condition. The MTC condition also yielded slightly better acquisition of full word vocalizations and independent vocalizations for two participants. Results of this study were marginal and inconsistent but could suggest MTC training to have a slight advantage in the acquisition of vocal responses in individuals with speech delays. It also appears that teaching sign language to individuals with communication delays does not hinder natural speech development. Keywords: Vocal alone, total communication, modified total communication, manding, vocal prompt, alternating treatments design, autism spectrum disorder
Temple University--Theses
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Gyamfi, Samuel. "Demand Response Assessment and Modelling of Peak Electricity Demand in the Residential Sector: Information and Communcation Requirements." Thesis, University of Canterbury. Mechanical Engineering Department, 2010. http://hdl.handle.net/10092/5063.
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Peak demand is an issue in power supply system when demand exceeds the available capacity. Continuous growth in peak demand increases the risk of power failures, and increases the marginal cost of supply. The contribution of the residential sector to the system peak is quite substantial and has been a subject of discussion internationally. For example, a study done in New Zealand in 2007 attributed about half of system peak load to the residential sector. International research has attributed a significant influence of human behaviour on households energy use. “Demand Response” is a demand side management tool aimed at achieving peak energy demand reduction by eliciting behaviour change. It encompasses energy needs analysis, information provision to customers, behaviour induction, smart metering, and new signalling and feedback concepts. Demand response is far advanced in the industrial and commercial demand sectors. In the residential sector, information barriers and a lack of proper understanding of consumers’ behaviour have impeded the development of effective response strategies and new enabling technologies in the sector. To date, efforts to understanding residential sector behaviour for the purpose of peak demand analysis has been based on pricing mechanism. However, not much is known about the significance of other factors in influencing household customers’ peak electricity demand behaviour. There is a tremendous amount of data that can be analyzed and fed back to the user to influence behaviour. These may include information about energy shortages, supply security and environmental concerns during the peak hours.
This research is intended to begin the process of understanding the importance of some of these factors in the arena of peak energy consumption behaviour.
Using stated preference survey and focus group discussions, information about household customers’ energy use activities during winter morning and evening peak hours was collected. Data about how customers would modify their usage behaviour when they receive enhanced supply constraint information was also collected. The thesis further explores households’ customer demand response motivation with respect to three factors: cost (price), environment (CO2-intensity) and security (risk of black-outs). Householders were first informed about the relationship between these factors and peak demand. Their responses were analyzed as multi-mode motivation to energy use behaviour change.
Overall, the findings suggest that, household customers would be willing to reduce their peak electricity demand when they are given clear and enhanced information. In terms of motivation to reduce demand the results show customers response to the security factor to be on par with the price factor. The Environmental factor also produced a strong response; nearly two-thirds of that of price or security.
A generic modelling methodology was developed to estimate the impact of households’ activity demand response on the load curve of the utility using a combination of published literature reviews and resources, and own research work. This modelling methodology was applied in a case study in Halswell, a small neighbourhood in Christchurch, New Zealand, with approximately 400 households. The results show that a program to develop the necessary technology and provide credible information and understandable signals about risks and consequences of peak demand could provide up to about 13% voluntary demand reduction during the morning peak hours and 8% during the evening peak hours.
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Diaz, Römmesmo Lorena. "Att härbärgera det ohållbara : - en ministudie av härbärgerande och hållande i kliniska samtal." Thesis, Ersta Sköndal högskola, S:t Lukas utbildningsinstitut, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:esh:diva-1771.
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Shepherd, Melvin D. "A study using communcation practices, motivation principles and high performance learning strategies to aid students in the classroom with emotional disabilities." Menomonie, WI : University of Wisconsin--Stout, 2005. http://www.uwstout.edu/lib/thesis/2004/2004shepherdm.pdf.
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Ekman, Rasmus. "Automobile Control Systems : Transition from Controller Area Networks to Ethernets." Thesis, KTH, Radio Systems Laboratory (RS Lab), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-148052.
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Due to concerns about the negative impacts of powering vehicles using fossil fuel and the future availability of fossil fuel, there has been an increased focus on electric vehicles. However, current electric vehicle energy efficiency is a key problem as these vehicles are not as efficient as fossil-fueled vehicles. One way of decreasing a vehicle’s energy consumption is to reduce the weight of the vehicle, while still ensuring the safety and reliability of the vehicle. Controller Area Network (CAN) systems have been used in vehicles to realize real-time applications, however the low peak data rates of CAN have begun to limit the applications that can be realized. This bachelor’s thesis project focuses on secure communication within a vehicle using Ethernet. Additionally, the use of Power over Ethernet can be used for powering some of the network attached devices within the vehicle. The goal is to reduce the number of components and the weight of the vehicle while continuing to ensure the security and reliability of the communication – even when the network grows in size (either in physical size or in number of connected devices). This thesis shows that an Ethernet based system can serve as a possible replacement candidate for the CAN system due to its low latencies and high bandwidth. Ethernet is also a very scalable system with none of the limitations that a CAN system have.Den negativa påverkan av fossila bränslen har de senaste årtionden haft en negativ på planeten, mängden fossila bränslen över världen konsumeras även i en högre takt än vad som produceras. Därför har fokusen för att finna förnybara energi källor som både är effektiva och inte påverkar miljön på ett negativt sätt ökat. Därför är elbilar en viktig del i konverteringen av enheter som drivs av fossila bränslen till förnybara energikällor. Ett av problemen i en elbil är att energi konsumptionen är inte lika effektiv som fossila bränslen inom bil industrin. Ett sätt att sänka energi konsumptionen är att minska mängden komponenter inom en bil för att minska på vikten, utan att påverka säkerheten och tillförlitligheten. Tidigare har man använt sig av ett CAN system för att försäkra sig om systemet fungerar felfritt i realtid, problematiken med detta system är att när nätverket ökar i storlek så sätter de fysiska begränsningarna av detta system stop för den garanterade säkerheten. Detta kandidatexamensarbete kommer att fokusera på den interna kommunikationen i en elbil med hjälp av ett ethernet baserat kommunkations system över CAN systemet. Power over Ethernet tekinken kommer att tillämpas för de systemen som kan drivas av detta system. Målet är att reducera antalet komponenter som behövs och att garantera säkerheten och tillförlitligheten av den interna kommunikationen när nätverket av komponenter ökar i storlek. Det här kandidatarbetet visar att Ethernet kan ersätta det nuvarande CAN systemet ef-tersom att Ethernet erbjuder låga latenser och hög bandbredd. Detta arbete visar även att Et-hernet är väldigt skalbart och har inte begränsingarna som ett CAN system har.
9
Krejčová, Šárka. "Koncepce komunikačního a distribučního systému webového portálu." Master's thesis, Vysoká škola ekonomická v Praze, 2012. http://www.nusl.cz/ntk/nusl-162460.
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This thesis deals with the design of functional solutions for the communication and distribution system project web portal AkceZ.cz. It was prepared on the basis of personal experience and knowledge of the author of the process of creation and functioning of the communication portal. The main goal of this work is to create a realistic picture of the communication and distribution system implementated still alive and functioning project.
10
Халезова, Л. В. "Формування навичок публічної комунікації як одного з основних чинників підготовки конкурентноспроможного професіонала." Thesis, Рибэст, 2012. http://essuir.sumdu.edu.ua/handle/123456789/63719.
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Проаналізовано необхідність формування спеціальних комунікативних навичок для публічної комунікації на прикладі складання та проведення бізнес-презентацій.The paper analyzes the need for specific communication skills forming using creating and performing business-presentations as an example that will later help in a career of a student majoring in international economics because of the need to develop concepts of intercultural communication.
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Norvell, Karen. "In good communication and in bad: A study of premarital counseling and communication skills in newlywed couples." Thesis, University of North Texas, 2009. https://digital.library.unt.edu/ark:/67531/metadc9836/.
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This study examined the effects of premarital counseling on newlywed communication. It was predicted that individuals who had participated in premarital counseling would have lower levels of demand/withdrawal communication and higher levels of spousal support. The effects of the format of the counseling were also examined. Individuals who had been married less than two years completed a survey measuring their marital satisfaction, levels of demand/withdraw, and perceived spousal support. Social learning theory was used as a theoretical lens. Results suggested that participating in premarital counseling has no affect on newlywed communication. Newlyweds who had been exposed to a group format during their counseling had higher marital satisfaction than those who had just participated in a one-on-one format with a counselor.
12
Howard, Laura. "Technical Communication Strategies in Marketing." Miami University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=miami1304622588.
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Saloma, Anjara. "Humpback whales (Megaptera novaeangliae) mother-calf interactions." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS138.
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Chez les baleines à bosse (Megaptera novaeangliae), le maintien des liens sociaux entre les femelles et leurs nouveau-nés implique différentes modalités sensorielles telles que l'ouïe, le toucher et la vision. Si la communication acoustique chez les mâles chanteurs de cette espèce a été largement étudiée, les sons sociaux, en particulier ceux produits par les femelles et leurs nouveau-nés, ont été peu reportés. Cette étude décrit les sons sociaux présents dans les enregistrements acoustiques axés sur les groupes mère-baleineau et discute des vocalisations produites par les femelles et les baleineaux dans les interactions mère-jeune. En considérant les sons les plus fréquents de ce répertoire vocal, une analyse centrée sur la détermination de la source des sons de bass fréquence produits par la mère a été effectuée et des analyses ont été réalisées pour mettre en évidence l'individualité de certaines vocalisations appartenant à la mère et à son petit. Une description du contexte comportemental de leur production vocale a été réalisée et parallèlement, les profils de plongée des mères et de leurs nouveau-nés ont été décrits. En outre, les femelles et leurs petits passent beaucoup de temps à la surface de l'eau. Les mères sont souvent statiques à la surface tandis que les baleineaux évoluent autour d'elles. Cette étude est également consacrée à la compréhension de leurs comportements de surface, en tenant compte des comportements initiés par les baleineaux. Des séries d’analyses ont été réalisées pour déterminer si les baleineaux présentaient des comportements de latéralisation par rapport à leur mère. Enfin, en utilisant la méthode de photogrammétrie, les tailles des femelles et des nouveau-nés ont été mesurées, ainsi que l'espace utilisée par les baleineaux autour de leur mèreIn humpback whales (Megaptera novaeangliae), maintaining social bonds between females and their newborns involves different sensory modalities such as hearing, touching and vision. While acoustic communication in male singers of this species has been extensively studied, social sounds, especially those produced by the females and their newborns have been poorly documented. This study describes the social sounds present in acoustic recordings focused on mother-calf groups and discusses the vocalizations used by females and calves in mother-offspring interactions. By considering the most frequent sounds from their vocal repertoire, an analysis focused on the determination of the source of the low-frequency sounds produced by the mother have been carried out and analyses were performed to investigate the individuality of some vocalizations belonging to the mothers and the calves. A description of the behavioural context of their vocal production was performed and the diving profiles of mother-calf pairs were described. Moreover, females with their calves spend a lot of time on the water surface. Mothers are often static at the surface while calves move around them. This study is also dedicated to the understanding of their surface behaviours, considering the behaviours initiated by calves. A series of analyses were carried out to determine whether calves exhibited lateralization behaviours in relation to their mothers. Finally, by using photogrammetry method, mother-calf lengths were measured, and calves spatial range around their mothers was investigated
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Hogan, Bernard Michael, and n/a. "The Internet as a Research and/or Communication Tool to Support Classroom-Based Instruction: Usage, Value, and Utility for Post-Secondary Students." Griffith University. School of Film, Media and Cultural Studies, 2004. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20040719.124141.
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Recent research indicates that the Internet (or Net) is currently being used at many post-secondary institutions in support of traditional, classroom-based instruction. From 1994 to 2002, the percentage of post-secondary classes using the Web as a research tool and E-mail as a method of communication has increased almost ten fold. An extensive literature on the evaluation of the Internet as an educational technology has developed in recent years; however, there are some gaps that need to be filled to provide a more complete understanding of the Internet and its use by post-secondary students. First, most of the studies focus primarily on student usage of the Net, and less so on the value (or the advantages and disadvantages) and the utility (or usefulness) associated with that usage. Second, many of these studies make a distinction between the research and communication functions of the Internet. While I argue that this is an appropriate distinction, many examine one function or the other only and not both simultaneously. The central research problem that this study addresses is helping to fill those two gaps in the evaluation literature by examining in detail student usage, value and utility of the Net as a research and/or communication tool for post-secondary students in support of classroom-based instruction. Drawing upon work from the fields of media studies, learning theory, and theories of communication, I establish a "Net as Tool" framework and adopt a uses and gratifications approach to examine student use of the Net. The three main inter-related concepts of usage, value and utility are used as organizing themes for the study, and I designed and developed a survey instrument to gather original quantitative data from post-secondary students in both Canada and Australia to fully examine those concepts. Two focus group sessions were designed to supplement this quantitative data with qualitative findings (and to generate more in-depth insights into student usage, value and utility of the Net as a research and/or communication tool). The results presented in this study have both theoretical and practical importance. In regards to the theoretical side, I have identified the underlying dimensions of usage, value, and utility, and highlighted what makes the Net valuable and useful as a research and/or communication tool. Additionally, I have identified the factors which are related to usage, value, and utility, and explored the inter-related nature of those three concepts. I concluded my study with an outline of the importance of the skill of digital literacy so that students can cope effectively with the online environment. These findings are significant because they help to fill some specific gaps in the evaluation knowledge of the Net in post-secondary education. In addition, I have developed a practical strategy which suggests how the Net could be used most effectively by students as a research and/or communication tool in support of classroom based instruction. The areas addressed by the strategy include access, infrastructure, technical support, training, integration into the curriculum, and appropriate use of the tool. The overall strategy is important because it contributes to our understanding of the Net as an educational tool, and it outlines ways to address the issue of the digital divide within post-secondary education. It is hoped the strategy will be useful to training staff, post-secondary administrators, instructors, and students.
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Hogan, Bernard Michael. "The Internet as a Research and/or Communication Tool to Support Classroom-Based Instruction: Usage, Value, and Utility for Post-Secondary Students." Thesis, Griffith University, 2004. http://hdl.handle.net/10072/366273.
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Recent research indicates that the Internet (or Net) is currently being used at many post-secondary institutions in support of traditional, classroom-based instruction. From 1994 to 2002, the percentage of post-secondary classes using the Web as a research tool and E-mail as a method of communication has increased almost ten fold. An extensive literature on the evaluation of the Internet as an educational technology has developed in recent years; however, there are some gaps that need to be filled to provide a more complete understanding of the Internet and its use by post-secondary students. First, most of the studies focus primarily on student usage of the Net, and less so on the value (or the advantages and disadvantages) and the utility (or usefulness) associated with that usage. Second, many of these studies make a distinction between the research and communication functions of the Internet. While I argue that this is an appropriate distinction, many examine one function or the other only – and not both simultaneously. The central research problem that this study addresses is helping to fill those two gaps in the evaluation literature by examining in detail student usage, value and utility of the Net as a research and/or communication tool for post-secondary students in support of classroom-based instruction.
Drawing upon work from the fields of media studies, learning theory, and theories of communication, I establish a "Net as Tool" framework and adopt a uses and gratifications approach to examine student use of the Net. The three main inter-related concepts of usage, value and utility are used as organizing themes for the study, and I designed and developed a survey instrument to gather original quantitative data from post-secondary students in both Canada and Australia to fully examine those concepts. Two focus group sessions were designed to supplement this quantitative data with qualitative findings (and to generate more in-depth insights into student usage, value and utility of the Net as a research and/or communication tool). The results presented in this study have both theoretical and practical importance. In regards to the theoretical side, I have identified the underlying dimensions of usage, value, and utility, and highlighted what makes the Net valuable and useful as a research and/or communication tool. Additionally, I have identified the factors which are related to usage, value, and utility, and explored the inter-related nature of those three concepts. I concluded my study with an outline of the importance of the skill of digital literacy so that students can cope effectively with the online environment.
These findings are significant because they help to fill some specific gaps in the evaluation knowledge of the Net in post-secondary education. In addition, I have developed a practical strategy which suggests how the Net could be used most effectively by students as a research and/or communication tool in support of classroom based instruction. The areas addressed by the strategy include access, infrastructure, technical support, training, integration into the curriculum, and appropriate use of the tool. The overall strategy is important because it contributes to our understanding of the Net as an educational tool, and it outlines ways to address the issue of the digital divide within post-secondary education. It is hoped the strategy will be useful to training staff, post-secondary administrators, instructors, and students.Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Film, Media and Cultural Studies
Faculty of Arts
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Lowes, Philip. "Radio antennas on glass." Thesis, Northumbria University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367424.
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Clarke, Richard. "On Synchronisation Issues in Wireless Mobile Digital Communications." Thesis, University of Canterbury. School of Engineering, 2002. http://hdl.handle.net/10092/1156.
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Symbol timing recovery is an important function of any digital receiver. In the wireless mobile data field the task of establishing accurate symbol timing at the receiver is complicated by the time varying channel. This time varying channel also makes the use of coherent modulation schemes significantly more difficult. This is one of the major reasons that almost all existing mobile wireless digital standards utilise some form of differential modulation and detection. This thesis takes a primarily practical approach to the investigation of timing and phase estimation problems. The main focus of the work is on the comparison of three existing all digital timing synchronisation algorithms, two of which were originally designed for the AWGN channel, and the third was designed from ML principles for the Rayleigh fading channel. In order to test these sub-systems in the wider context of receiver performance, a pilot symbol assisted (PSAM) receiver was simulated to compare the effects of the different synchronisers on receiver steady state performance. Finally, because the real time implementation aspects of software radio are of considerable interest to the author, some attempt has been made to migrate the MATLAB synchronisation simulations to a real time DSP platform, specifically the TMS320C6701 Texas Instruments floating point device.
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Stucki, Eric Thomas. "Medium Access Control and Networking Protocols for the Intra-Body Network." Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1182.pdf.
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Taylor, Howard. "The effects of interpersonal communication style on task performance and well being." Thesis, Bucks New University, 2007. http://bucks.collections.crest.ac.uk/10118/.
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This thesis is based around five studies examining the psychology of interpersonal communication applied to organizational settings. The studies are designed to examine the question of how the way that people in positions of power in organizations communicate with subordinates, affects various measures of health, well-being and productivity. It is impossible to study modern organisational communication without recognising the importance of electronic communication. The use of e-mail and other forms of text messaging is now ubiquitous in all areas of communication. The studies in this thesis include the use of e-mail as a medium of communication and examine some of the potential effects of electronic versus face-to-face and verbal communication. The findings of the studies support the basic hypothesis that: it is not what is said that matters but how it is said. The results showed that an unsupportive, formal, authoritarian style of verbal or written communication is likely to have a negative effect on health, well-being and productivity compared with a supportive, informal and egalitarian style. There are also indications that the effects of damaging communications may not be confined to the initial recipient of the message. Organizational communication does not take place in a vacuum. Any negative consequences are likely to be transmitted by the recipient, either back to the sender or on to other colleagues with implications for the wider organisational climate. These findings are based on communications that would not necessarily be immediately recognised as obviously offensive or bullying, or even uncivil. The effects of these relatively mild but unsupportive communications may have implications for the selection and training of managers. In the final section of the thesis there is a discussion of how examples of various electronically recorded messages might be used as training material.
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Chen, Reler, and 陳瑞樂. "Implementing Internetwork Group Communcation on heterogeneous UNIX systems." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/91174074799115652080.
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碩士淡江大學
資訊工程研究所
83
The paper introduces a practical system for achieving a reliable globally ordered broadcast services and illustrates how that can be used to provide group communication. A group communication has the key property that when any member sends a message to its own group, all members within this group will receive it. The broadcast primitives is supported by UDP/IP which reduces the overhead of communication traffic by TCP/IP. The protocol of group communication is a modified version of that introduced by Kaashoek and Tanenbaum[9]. The purpose of the work is to describe a protocol which supports more convenient interfaces than the existing transport layer for building the needed primitives, such as creat-group, joing- group,send-to-group,receive-from-group and so on, to implement group communication systems. In addition, we provide a reliable communication for user applications in the presence of processor failures. Another important purpose of our paper is implementing group communication on heterogeneous UNIX systems (SunOS 4.1.x, Linux 1.1.x) and providing a good performance for a group with N members on different subnets.
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Li, Shu-Ya, and 李舒雅. "A Down-Conversion Mixer for Multiband Wireless Communcation Systems." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/w4xky3.
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碩士國立東華大學
電機工程學系
96
Mixers are responsible for the frequency converting in the wireless communication systems. The operating frequency bands of the wireless communication systems include narrow band, wideband, or multi-band under various applications. Hence, mixers are designed according to different system specifications. On the other hand, the linearity of a wireless system is mainly decided by a mixer. It is difficult for wideband or multi-band systems to have a mixer which can remain both high linearity and good flatness of conversion gain at the same time. A down-conversion mixer for multi-band wireless systems is presented in this thesis. The proposed mixer is implemented with tsmc 0.18-
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Wu, Yi-Feng, and 吳翊逢. "Internal Penta-Band Antenna Designs for Mobile Communcation Applications." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/04588158082121267417.
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碩士國防大學理工學院
電子工程碩士班
97
In this thesis, three internal antennas for mobile communication systems are proposed. Two wide operating bands are obtained for the proposed antennas to cover all the five bands of GSM850/GSM900/GSM1800/GSM1900/UMTS. The penta-band operation and lower-height construction provided by the proposed antennas are advantageous features. Because the former two antenna designs were proposed for mobile phone applications, they are restricted to have total length of not larger than 45 mm. The first promising mobile phone antenna with inverted-F-shaped construction has total height of not higher than 15 mm. To achieve the antenna design goal having a height of not larger than 10 mm, the second promising mobile phone antenna has the similar construction as the first one and a matching circuit to improve impedance match within the abovementioned five bands. The last antenna design for laptop computer based on a simple design idea and structure can be developed to achieve a final construction with a smaller size than that of the conventional designs. Moreover, good radiation characteristics make the proposed antennas very promising for applications in mobile communication device.
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CHIU, CHIH-KAI, and 邱智凱. "Design and Implementation of Low-Power Frequency Synthesizer for 5-GHz Wireless Communcation System." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/47qd9u.
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碩士東海大學
電機工程學系
105
With the rapid development of semiconductor manufacturing process, the requirement of chip operating speed is become more faster and faster, so the design of frequency synthesizer is more challenging in the wireless communication system. In the thesis, we propose two frequency synthesizer using different architectures to achieve low supply voltage and low power targets for the protocol of IEEE 802.11 system. There are mainly divided into three parts in this thesis to discussed. The first part will introduce the phase-locked loop and the principles of each sub-circuits, and the phase noise analysis of the oscillator and frequency synthesizer. The second part introduces a low-voltage frequency synthesizer which adopt the inductance coupled topology. Implemented by TSMC 0.18μm CMOS process, the frequency synthesizer provides the tuning range of 4.58-GHz to 5.02-GHz and the phase noise is −117.53 dBc/Hz at 1-MHz frequency offset. The overall power consumption of the whole circuit is 5.02mW at 0.8v power supply. Finally, the last part discuss a low-power frequency synthesizer realized by using current-reuse principles. The chip is implemented by TSMC 0.18μm CMOS process with an operating frequency of 4.83-GHz to 5.03-GHz and its phase noise is −111.02 dBc/Hz at 1-MHz frequency offset. The overall power consumption of the frequency synthesizer is 3.58mW.
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Hsin-Hua, Lo, and 羅心華. "The relationship among consumer’s mood, emotion, store atmosphere and impulsive buying behavior from an intergated marketing communcation perspective." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/ppqj84.
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碩士國立交通大學
傳播研究所
94
Facing the time of experience economy, recently more and more industries and companies emphasize on satisfied consumers’ mental and emotional needs. As a result, Industries of retailing are conscious of store atmospherics. All physical surrounding in a store is store atmosphere and befitting store atmospherics will bring some particular react on mentality, Sometimes, it’ll be impulse buying. For this reason, some dealers in retailing try to use store design, product display and so on to increase the probability of impulse buying. This research chooses purposive sampling and Shin Kong Mitsukoshi Department stores and Idee Department stores to conduct the survey. Tree hundreds tree questionnaires returned from these four department stores. The results indicated that the male is more than female in the percentage of impulse buying and impulse buying behavior only correlates with sex distinction. There is no significance in impulse buying about age, educational background, marriage, and occupation. Part of store atmosphere, the most important factor is the insider and outsider shopfitting, because it can solicit the highest emotion for consumer. The second important factor is the decoration of no functional use, and it also can solicit consumers’ emotion. At last, the lamplight and illumination can’t solicit consumers’ positive emotion.
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Rapakwana, Ngwako Johannah. "The effect of a provincial communcation strategy to address HIV, AIDS, STIs and TB (HAST) in the Limpopo Province." Thesis, 2017. http://hdl.handle.net/10500/23605.
Full textAbstract:
The lack of a contextualised, relevant communication strategy focusing specifically on
HAST diseases in the Limpopo Province was the impetus for this research. The
purpose of this study was, therefore, to explore the knowledge, perceptions and
utilisation of health facilities for HAST in order to develop an acceptable and effective
communication strategy for the Province to address the high rate of HAST diseases.
The study followed a qualitative approach guided by the major tenets of the Health
Belief Model, namely, to determine modifying factors, individual beliefs and cues for
action. An in-depth literature review was followed by focus group interviews with the
community members and personal interviews with District and Provincial Deputy
Directors. Based on these findings, a communication strategy was drafted and piloted
for three months in one of the districts in Limpopo. Further refinement of the
communication strategy followed after member-checking and further interviews with
directors HAST.
The final strategy specifically focused on risk groups with each of the diseases in terms
of their beliefs and perceptions. It further resulted in guidelines for health providers in terms of the content and implementation of effective communication strategies within
the context of educational, cultural, social and economic factors relevant to LimpopoHealth Studies
D. Litt. et Phil. (Health Studies)
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Lin, Nicole, and 林珮玉. "Assessing Key Factors for Affecting Turnover Intention - A Case Study of R&;D Staff in C Network Communcation Corporation." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/m8539k.
Full textAbstract:
碩士中原大學
企業管理研究所
100
Indicated from statistics of MIC (2012), the output value throughout Taiwan's communication industry (hereinafter referred to as “the Industry”) will reach about NT $ 2.32 trillion (77.9 billion US dollars approximately) with the annual growth rate of 14.2%, in other words, even under global chaotic economy, the Industry remains uprising a trend of growth opportunities, hence, each network communication manufacturer is involved in research and development (R&;D) for preliminary market opportunities. Ability in R&;D is a critical source to create competitive advantage in network communication industry, while R &; D staffs become assets with significance, also the key to a company's innovation and R &; D capabilities, likewise, R &; D staffs are the core in the company; therefore, their resignations will cause massive influence on the competitive advantages and business performance in view of this, supposed that factors to R &; D staff’s turnover intention are seized well, which will drive development of strategies for maintenance of talents, stabilization of operational performance and competitiveness in the market. This study was based on a listed communication company which has been in Hsinchu area for more than 15 years as the case subject, where it produces routers and VoIP switches mainly. It is featured with its multipurpose and high reliability as the core value of product in the network communication market; besides, with strategies schemed for branding on their won, it has have massive sales of Taiwan LOGO worldwide, which has more than seventy partners globally in Five Continents, also has cooperative relationship with UK BT, Slovakia T-Com and other famous telecommunication bureaus. It is even the most common network communication brand which is widely used by small to medium enterprises in the UK. In 2012, it was even selected as the backbone enterprise by the Ministry of Economic Affairs. With its emphasis on the brand, the case company has more than 40% of R &; D team members of all; this team masters the product line made by key technology become the core, also a critical series of resource in the company. Among literatures as to resignation historically, most of them were discussions based on some factors to turnover intention including but not limited to job satisfaction, work pressure and incentive system; however, practically, there shall be a wide range of aspects forming employee turnover where other factors might coexist behind, such as job adaption, employee’s impersonal relationship, factors as to organization, remuneration &; salary, better recruitment from other companies and so forth; and for research methods, the most were regression analysis methods, but, such method would be expressed in adder form among factors, which has difficulty to exhibit relation variables influence mutually. As a result that DEMATEL-based Analytic Network Process (DANP) emphasizes more or less independence among guidelines and it is also an effective tools to figure out key factors; hence, it was used in this study to clarify relation variables influence mutually and identify key factors to R&;D staff’s turnover intention. Indicated from the findings herein, the key factors to a staff’s turnover intention shall include but not limited to leadership, remuneration &; salary and promotion opportunities. Among of them, leadership constitutes the most critical role as good leadership leads to good atmosphere filled in the workplace, improved morality and happy to work as a team, further systemizing the organization for effective achievement of targets. The more brilliant performance, the lower a staff’s turnover intention shall be. For causality of such key factors, the findings suggest that improvement of leadership drives that of performance behind other key factors effectively. Here comes other portion of causality as follows: 1. Leadership affects promotion opportunity Under a manager with his leadership built on will to considerate subordinates, staff has more obvious will to seek for getting promoted and brilliant performance, so is a leadership of a manager with more concern of organizational structure; likewise, it also satisfies ambitious R&;D staff by such promotion throughout his career life and target of maintaining R&;D elites shall be achieved to assure competitiveness within the organization. 2. Leadership affects Work Independence Democratic leadership leads to more obvious trend of independence during works performed by a staff and manager would have more time spent on the product line and tasks; although a number of managers in R&;D department of technology industries imitated so historically, with growth and expansion, this way fails to improve performance in the management effectively further. Supposed that managers utilizes specialty of every subordinate in his job, not only it improves manger’s leadership, but also it facilitates subordinate’s executing capabilities, further overall operational performance; only robust organization retains elite. 3. Leadership affects personal factor Scholars, Daniel Goleman et al. suggested that managers shall play a role which cares for others appropriately; these managers shall brew teamwork manner in harmony diligently, intensifying morality and urging more opportunities of exchange among staffs, as well as mutual trust and so forth. Managers’ maintenance of harmonious interaction with staffs will definitely centralize cohesion R&;D staff to the organization, which not only improves degrees staff spends in the job, but also reduces his intention to resign, further enhancing overall organizational performance. This study suggests case company and related industries to master key factors to R&;D staff’s turnover intention, also hereby suggests strategies as to elite maintenance; for preventive measures on resignation and management, this study also suggested strategies positioning staffs and maintaining staffs.
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Perera, Sean. "Exploring the implication of science communication practices on a model for teacher professional development: Serving up the Pierian Waters." Phd thesis, 2009. http://hdl.handle.net/1885/7105.
Full textAbstract:
Science communication, over the last two decades, has shifted its onus from public understanding to public engagement. These efforts have been paralleled in science education, which strives to promote continued student engagement with science. Persistence with more traditional forms of pedagogy by teachers in middle school is a chief deterrent to this endeavour. Since many teachers' inadequate understanding about science is regarded as inhibiting their use of inquiry-based pedagogy, professional development based on constructivist principles has been identified to remedy this problem. This study investigates the constructivist basis for a model of short-term professional development, which has not been addressed in the literature. The one-day workshops offered to middle school science teachers in Australia and overseas by the Centre for the Public Awareness of Science (ANU, Canberra) are investigated here. While the workshops did facilitate conceptual change in the teachers, it was found that the constructivist principles which were incorporated into the workshops' design and delivery were underpinned by science communication practices. The conclusions presented include: the possibility of a constructivist framework for short-term professional development; the need for greater involvement of science communication in science education reform; and the unique challenges which confront science teachers from non-Western cultures.
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Dippenaar, Jacques Roché. "The licence as a mechanism to improve performance : the case of Cell C." Diss., 2011. http://hdl.handle.net/10500/6709.
Full textAbstract:
The licence is a regulatory tool that regulatory use to assist in their regulatory functions. Licences restricts operator’s’ functions, but also serve as a guideline of acceptable conduct because a licence is a legally binding document containing prescribed conditions that the licencee must meet. If the licencee does not comply with these prescribed obligations and requirements, the licence may be revoked or the licencee may be penalized (Bladwin & Cave 1999). However, in order fro the mechanism of issuing a licence to be an effective mechanism of regulation, the regulator needs to regulate effectively in order to ensure that the licencee’s performance is of acceptable standard.
The purpose of this study is to investigate the relationship between issuing a licence and the licencee’s performance; to investigate whether the performance indicators, as defined by ICASA, are adequate, and to develop appropriate performance indicators in order to evaluate Cell C’s performance. Issuing a licence to licencee does not guarantee that the performance of the licencee, such as Cell C, will be effective. Thus, the licencee needs to be evaluated.
The case study design has been used for this project. The methodology includes in-dept interviews, documentary analysis, and implementation evaluation research. The report concludes that Cell C has met its licence obligations, that licencing is coupled with effective mechanisms to ensure that the licencee complies with performance requirements, but that, in order for the licencee to improve its performance, effective regulatory intervention is needed.Communication Science
MA (International Communication)
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Tien, Po-Lung, and 田伯隆. "Intra-media Synchronization Techniques for Multimedia Communcations." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/79197809233498041911.
Full textAbstract:
博士國立交通大學
資訊工程系
88
For transporting vedio and voice data over the network, the problem of jitter introduced from the network often renders the playout discontinuity and speech unintelligible. It is thus indispensable to offer intramedia synchronization to remove jitter while retaining satisfactory playout throughput and minimal playout delay. In this thesis, we propose two smoothing mechanisms, operating at the application layer of the receiving end system, for video and voice communications: Intelligent Vedio Smoother(IVS) and Intelligent Voice Smoother (IVoS). IVS is composed of a Neural Network (NN) Traffic Predictor, an NN Window Determinator, and a window-based playout smoothing algorithm. The NN Traffic Predictor employs an on-line-trained Back Propagation Neural Network (BPNN) to periodically predict the characteristics of traffic modelled by a generic Interrupted Bernoulli Process (IBP) over a future fixed time period. With the predicted traffic characteristics, the NN Window Determinator determines the corresponding optimal window by means of an off-line-trained BPNN in an effort to achieve a maximum of the playout Quality (Q) value. The window-based playout smoothing algorithm then dynamically adopts various playout rates according to the window and the number of packets in the buffer. Finally, we show that, via simulation results and live video scenes, compared to two other playout approaches, IVS achieves high-throughput and low-discontinuity playout under a mixture of IBP arrivals. IVoS is composed of three components: Smoother Buffer, Neural Network (NN) Traffic Predictor, and Constant Bit Rate (CBR) Enforcer. Newly arriving frames, being assumed to follow a generic Markov Modulated Bernoulli Process (MMBP), are queued in the Smoother Buffer. The NN Traffic Predictor employs an on-line-trained Back Propagation Neural Network (BPNN) to predict three traffic characteristics of every newly encountered talkspurt period. Based on the predicted characteristics, the CBR Enforcer derives an adaptive buffering delay by means of a near-optimal, simple, closed-form formula. It then imposes such delay on the playout of the first frame in the talkspurt period. The CBR Enforcer in turn regulates CBR-based departures for the remaining frames of the talkspurt, aiming at assuring minimal mean and variance of Distortion of Talkspurts (DOT) and mean Playout Delay (PD). Simulation results reveal that, compared to three other playout approaches, IVoS achieves superior playout yielding negligible DOT and PD irrespective of traffic variation.
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Růžičková, Nicole. "Katastrofa? Události ve změněných souvislostech - inspirace pro vlastní tvorbu i výtvarnou výchovu." Master's thesis, 2017. http://www.nusl.cz/ntk/nusl-346712.
Full textAbstract:
This dissertation follows the topic of media and visual communication with relations to art. The theoretical part explains the usage and influence of such medias in the past and present, the communication between people and their visual statements, their psychological effects in connection to the manipulation of the picture. The practial part on the other hand, further explains the precise catastrophical events in the news and their overall effect in connection to personal explenations of said catastrophy. The last, Didaktical part, goes into detail on the transformation of catastrophies and possibility of applicating the medial education into the general creative uprbringing. Key Words Media, communcation, visual statements, manipulation of picture, catastrophy, medial education Powered by TCPDF (www.tcpdf.org)
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Ananya, S. N. "On The Best-m Feedback Scheme In OFDM Systems With Correlated Subchannels." Thesis, 2015. http://etd.iisc.ernet.in/handle/2005/2637.
Full textAbstract:
Orthogonal frequency division multiplexing (OFDM) in next generation wireless systems provides high downlink data rates by employing frequency-domain scheduling and rate adaptation at the base station (BS). However, in order to control the significant feedback overhead required by these techniques, feedback reduction schemes are essential. Best-m feedback is one such scheme that is implemented in OFDM standards such as Long Term Evolution. In it, the sub channel (SC) power gains of only the m strongest SCs and their corresponding indices are fed back to the BS.
However, two assumptions pervade most of the literature that analyze best-m feedback in OFDM systems. The first one is that the SC gains are uncorrelated. In practice, however, the SC gains are highly correlated, even for dispersive multipath channels. The second assumption deals with the treatment of unreported SCs, which are not fed back by the best-m scheme. If no user reports an SC, then no data transmission is assumed to occur. In this thesis, we eschew these assumptions and investigate best-m feedback in OFDM systems with correlated SC gains.
We, first, characterize the average throughput as a function of correlation and
m. A uniform correlation model is assumed, i.e., the SC gains are correlated with each other by the same correlation coefficient. The system model incorporates greedy, modified proportional- fair, and round robin schedulers, discrete rate adaptation, and non-identically distributed SC gains of different users. We, then, generalize the model to account for feedback delay. We show in all these cases that correlation degrades the average throughput. We also show that this effect does not arise when users report all the SC power gains to the BS.
In order to mitigate the reduction in the average throughput caused by unreported SCs, we derive a novel, constrained minimum mean square error channel estimator for the best-m scheme to estimate the gains of these unreported SCs. The estimator makes use of the additional information, which is unique to the best-m scheme, that the estimated SC power gains must be less than those that were reported. We, then, study its implications on the downlink average cell throughput, again for different schedulers. We show that our approach reduces the root mean square error and increases the average throughput compared to several approaches pursued in the literature. The more correlated the SC gains, greater is the improvement.
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Pennington, Wayne Phillip. "Testing digital receiver performance through an HF environment simulator." 2005. http://hdl.handle.net/2440/37788.
Full text
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Pennington, Wayne Phillip. "Testing digital receiver performance through an HF environment simulator." Thesis, 2005. http://hdl.handle.net/2440/37788.
Full text
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(8151186), Paul Christian Thieme. "Long-Range High-Throughput Wireless Communication Using Microwave Radiation Across Agricultural Fields." Thesis, 2019.
Find full textAbstract:
Over the past three decades,
agricultural machinery has made the transition from purely mechanical systems
to hybrid machines, reliant on both mechanical and electronic systems. A this
transformation continues, the most modern agricultural machinery uses networked
systems that require a network connection to function to their full potential. In
rural areas, providing this network connection has proven difficult. Obstacles,
distance from access points, and incomplete coverage of cellular connection are
all challenges to be overcome. “Off the shelf” commercial-grade Wi-Fi
equipment, including many products from Ubiquiti like the Bullet M2 transceiver
and the PowerBeam point-to-point linking system, as well as antennas by
Terrawave, Crane, and Hawking, were installed in a purpose-built system which
could be implemented on a production farm. This system consisted of a
tower-mounted access point which used an antenna with a 65o
beamwidth, and the test included distances up to 1150 meters in an agricultural
setting with corn and soybeans. Some sensors were stationary and the other
platform was a tractor following a path around the farm with both 8dBi and
15dBi gain antennas. Through all tests, throughput never dropped below 5 Mb/s,
and the latency of successful connections never exceeded 20ms. Packets were
rarely dropped and never accounted for a significant portion of all packet
transmission attempts. Environmental effects like immediate precipitation, crop
heights, recent rainfall, and ambient temperature had little or no effect on
wireless network characteristics. As a result, it was proven that as long as
line-of-sight was maintained, reliable wireless connectivity could be achieved
despite varying conditions using microwave radiation. Network throughput was
marginally affected by the change in free space path loss due to increased
distance between the access point and the client, as well as travel by the
mobile client outside the beamwidth of the access point. By enabling this coverage, it is hoped that the implementation of new
agricultural technology utilizing a live network connection will progress more
rapidly.
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Krishna, Kumar S. "Blind Detection Techniques For Spread Spectrum Audio Watermarking." Thesis, 2007. http://hdl.handle.net/2005/588.
Full textAbstract:
In spreads pectrum (SS)watermarking of audio signals, since the watermark acts as an additive noise to the host audio signal, the most important challenge is to maintain perceptual transparency. Human perception is a very sensitive apparatus, yet can be exploited to hide some information, reliably. SS watermark embedding has been proposed, in which psycho-acoustically shaped pseudo-random sequences are embedded directly into the time domain audio signal. However, these watermarking schemes use informed detection, in which the original signal is assumed available to the watermark detector. Blind detection of psycho-acoustically shaped SS watermarking is not well addressed in the literature. The problem is still interesting, because, blind detection is more practical for audio signals and, psycho-acoustically shaped watermarks embedding offers the maximum possible watermark energy under requirements of perceptual transparency.
In this thesis we study the blind detection of psycho-acoustically shaped SS watermarks in time domain audio signals. We focus on a class of watermark sequences known as random phase watermarks, where the watermark magnitude spectrum is defined by the perceptual criteria and the randomness of the sequence lies in their phase spectrum. Blind watermark detectors, which do not have access to the original host signal, may seem handicapped, because an approximate watermark has to be re-derived from the watermarked signal. Since the comparison of blind detection with fully informed detection is unfair, a hypothetical detection scheme, denoted as semi-blind detection, is used as a reference benchmark. In semi-blind detection, the host signal as such is not available for detection, but it is assumed that sufficient information is available for deriving the exact watermark, which could be embedded in the given signal. Some reduction in performance is anticipated in blind detection over the semi-blind detection. Our experiments revealed that the statistical performance of the blind detector is better than that of the semi-blind detector. We analyze the watermark-to-host correlation (WHC) of random phase watermarks, and the results indicate that WHC is higher when a legitimate watermark is present in the audio signal, which leads to better detection performance. Based on these findings, we attempt to harness this increased correlation in order to further improve the performance. The analysis shows that uniformly distributed phase difference (between the host signal and the watermark) provides maximum advantage. This property is verified through experimentation over a variety of audio signals.
In the second part, the correlated nature of audio signals is identified as a potential threat to reliable blind watermark detection, and audio pre-whitening methods are suggested as a possible remedy. A direct deterministic whitening (DDW) scheme is derived, from the frequency domain analysis of the time domain correlation process. Our experimental studies reveal that, the Savitzky-Golay Whitening (SGW), which is otherwise inferior to DDW technique, performs better when the audio signal is predominantly low pass. The novelty of this work lies in exploiting the complementary nature of the two whitening techniques and combining them to obtain a hybrid whitening (HbW) scheme. In the hybrid scheme the DDW and SGW techniques are selectively applied, based on short time spectral characteristics of the audio signal. The hybrid scheme extends the reliability of watermark detection to a wider range of audio signals. We also discuss enhancements to the HbW technique for robustness to temporal offsets and filtering. Robustness of SS watermark blind detection, with hybrid whitening, is determined through a set of experiments and the results are presented. It is seen that the watermarking scheme is robust to common signal processing operations such as additive noise, filtering, lossy compression, etc.