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1
Cullen, Cionaith. "Network and signalling aspects of satellite personal communication networks". Thesis, University of Surrey, 1995. http://epubs.surrey.ac.uk/842984/.
Testo completoAbstract (sommario):
The use of satellites for mobile communication applications has become a global issue. The use of handheld, vehicle mounted and transportable terminals is a key feature of Satellite Personal Communication Networks (S-PCNs). Due to the higher eirp requirements on the Earths surface and also because of their inherent delay, geostationary (GEO) satellites are not considered suitable for such applications. Instead, constellations of satellites at lower altitudes have been proposed for use in what are termed 2nd generation mobile satellite communication systems. Low intensity regions in the Earths surrounding trapped radiation bands, have resulted in two altitude bands of specific interest, resulting in two constellation types - LEO (Low Earth Orbit) constellations at around 1,000 km and MEO (Medium Earth Orbit) constellations at around 10,000 km. A satellite constellation consists of a number of satellites orbiting at the same altitude and inclination and phased in a specific way. The work reported in this thesis proposes a network control architecture for LEO or MEO based S-PCN systems. Air-interface signalling aspects are then considered for mobility management and call setup signalling. LEO and MEO constellation design aspects and properties are initially considered. Important implications on the control network are drawn based on constellation coverage and connectivity properties. Other system constraints such as terrestrial network interworking considerations as well as user, network operator and regulator requirements are also considered. Finally network and more specifically satellite control signalling is examined before a S-PCN architecture is proposed. The reference architecture results in constellation control being distributed globally with individual satellite control, at any one time, being located at a specific earth station. The use of two earth station types allows network administration to be separated from traffic channel carrying aspects. In order to reduce system setup cost and delay, the reuse of network related standards from the GSM terrestrial mobile communication system is envisaged. An equivalence is made between the S-PCN architecture and the GSMs terrestrial architecture. Network implementation aspects are considered for a 14 satellite MEO constellation. Network implications resulting from the use of LEO and MEO constellations are considered. After an examination of S-PCN traffic demand on a MEO constellation, mobility management signalling is considered. A new approach is proposed based on the use of a positioning system. The performance of this approach is examined from a system signalling viewpoint for both LEO and MEO constellations and a method to minimise the required amount of signalling is described. The air interface signalling procedure for location update, based on a modified GSM network layer protocol, is simulated from a delay point of view for both LEO and MEO constellations. User-originated, user-terminated and user-to-user call setup signalling were also simulated and their delay performance examined. The importance of random access channel delay and of user cooperation with the link were highlighted as aspects which have a significant influence on the average signalling delay. Finally, the effect of common and dedicated control channel system signalling on satellite power consumption, based on busy hour call setup and mobility management signalling estimates, was examined for a MEO constellation. From this, conclusions can be made on the signalling power efficiency of S-PCN systems.
2
Janssen, Miriam. "Personal networks of chronic patients". [Maastricht : Maastricht : Rijkuniversiteit Limburg] ; University Library, Maastricht University [Host], 1992. http://arno.unimaas.nl/show.cgi?fid=5690.
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3
Zhou, Yuanyuan. "Energy-efficient protocols and topologies for sensor and personal-area networks". Online access for everyone, 2007. http://www.dissertations.wsu.edu/Dissertations/Summer2007/y_zhou_072307.pdf.
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4
Ho, Joseph S. M. "Mobility management for personal communications networks". Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/14882.
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5
Mirzadeh, Shahab. "Secure key management for personal networks". Thesis, University of Surrey, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.543916.
Testo completo
6
Ayrault, Cécile. "Service discovery for Personal Area Networks". Thesis, KTH, Mikroelektronik och Informationsteknik, IMIT, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-99125.
Testo completoAbstract (sommario):
With the increasing use of electronic devices, the need for affordable wireless services specifically context-aware services, in a so-called Personal Area Network (PAN) is becoming an area with significant potential. Service discovery is a basic function. Even though a number of service discovery protocols have been implemented, a specific protocol for a PAN environment may need to be developed, as the characteristics of a PANs differ from other networking environments. Thus, the specific requirements for service discovery from a PAN perspective were studied. Methods for service discovery will be described that take into account both local and remote services. These methods will then be evaluated in a SIP telephony infrastructure to decide where a call should be delivered. The location of a person is done by using the implemented service discovery.Med en ökad användning av elektroniska enheter blir behovet av trådlösa tjänster, speciellt context-medvetna tjänster i så kallade Personal Area Network (PAN), ett område med betydlig potential. Service Discovery är en grundläggande funktion. Även om flera service discovery protocols har implementerats finns det behov av ett specifikt protokoll för PAN-miljöer då egenskaperna hos ett PAN skiljer sig från andra nätverksmiljöer. Således studerades de specifika krav för service discovery från ett PAN perspektiv. Metoder för service discovery kommer att ta med i beräkningen båda lokala och avlägna tjänster. Dessa metoder utvärderas i en SIP telephony infrastructure för att avgöra var en påringning ska levereras. Lokalisering av en användare sker genom det implementerade service discovery-protokollet.
7
Abbadi, Imad Mahmoud Aref. "Digital Rights Management for Personal Networks". Thesis, Royal Holloway, University of London, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.487274.
Testo completoAbstract (sommario):
The thesis is concerned with Digital Rights Management (DRM), and in particular with DRM for networks of devices owned by a single individual. This thesis focuses on the problem of preventing illegal copying of digital assets without jeopardising the right of legitimate licence holders to transfer content between their own devices, which collectively make up what we refer to as an authorised domain. An ideal list of DRM requirements is specified, which takes into account the points of view of users, content providers and copyright law. An approach is then developed for assessing DRM systems based on the defined DRM requirements; the most widely discussed DRM schemes are then analysed and assessed, where the main focus is on schemes which address the concept of an authorised domain. Based on this analysis we isolate the issues underlying the content piracy problem, and then provide a generic framework for a DRM system addressing the identified content piracy issues. The defined generic framework has been designed to avoid the weaknesses found in other schemes. The main contributions of this thesis include developing four new approaches that can be used to implement the proposed generic framework for managing an authorised domain. The four novel solutions all involve secure means for creating, managing and using a secure domain, which consists of all devices owned by a single owner. The schemes allow secure content sharing between devices in a domain, and prevent the illegal copying of content to devices outside the domain. In addition, each solution incorporates a method for binding a domain to a single owner, ensuring that only a single consumer owns and manages a domain. This enables binding of content licences to a single owner, thereby limiting illicit content proliferation. In the first solution, domain owners are authenticated using two-factor authentication, which involves 'something the domain owner has', Le. a master control device that controls and manages consumers domains, and binds devices joining a domain to itself, and 'something the domain owner is or knows', i.e. a biometric or password/PIN authentication mechanism that is implemented by the master control device. In the second solution, domain owners are authenticated using their payment cards, building on existing electronic payment systems by ensuring that the name and the date of birth of a domain creator are the same for all devices joining a domain. In addition, this solution helps to protect consumers' privacy; unlike in existing electronic payment systems, payment card details are not exposed to third parties. The third solution involves the use of a domain-specific mobile phone and the mobil~ phone network operator to authenticate a domain owner before devices can join a domain. The fourth solution involves the use of location-based services, ensuring that devices joining a consumer domain are located in physical proximity to the addresses registered for this domain. This restricts domain membership to devices in predefined geographical locations, helping to ensure that a single consumer owns and manages each domain.
8
Zhu, Shaozhen. "Wearable antennas for personal wireless networks". Thesis, University of Sheffield, 2008. http://etheses.whiterose.ac.uk/10318/.
Testo completoAbstract (sommario):
In this study, we mainly characterize the wearable antenna system for off-body communications with respect to two conventional wireless communication systems as, cellular mobile systems (pes, GSM and UMTS) and wireless local area networks (WLAN). Unlike antennas embedded in portable devices, the complicated bodycentric environment has emerged with special requirements for wearable antennas design, like compact dimensions, light weight and flexible structure, hidden or water proofmg, and most importantly, capable of providing certain radiation shielding into the human body. This thesis aims to fmd an optimum solution to meet the particular requirements ofwearable antenna design. The first part is primarily concerned with characterising the electromagnetic properties of some textile and leather materials. Both insulating and conducting materials are investigated for using as substrate and radiating elements of high perfonnance textile antennas. Then a few of new antenna designs are proposed in the second part. These antennas are made out of textile and leather materials. They are low profIle, planar in geometry, and most importantly, they are capable to provide multi-operations with considerable wide bandwidth. An electromagnetic band gap structure is studied as it can provide a high impedance ground plane for low profIle antennas. The EBG plane can provide a perfect shielding layer for the body, and reduce the radiation toward the body significantly. Furthermore, the EBG plane is able to reduce the detuning of the antenna when placing near the body without serious bandwidth reduction, increase antenna gain and reduce mutual coupling from other devices. The final part carries out a series ofexperiments which can represent the body-centric environment These include bending, washing, wearing, coupling and SAR investigations. Antenna and EBG performances under body worn environment are tested and discussed in this thesis.
9
Schaefer, Cora. "Personal networks on social network sites (SNS) - Context and personality influences". [S.l. : s.n.], 2008. http://digbib.ubka.uni-karlsruhe.de/volltexte/1000009431.
Testo completo
10
Cismasu, Codrut Octavian. "Distributed simulation of personal communication service networks". Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=32986.
Testo completoAbstract (sommario):
Parallel and distributed simulation is recognized as a viable method for the modeling of complex dynamic systems. The main benefits of using a parallel versus a sequential technique in solving these problems are decreasing execution time and distributing the memory used in the simulation over a number of processors.Parallel simulation techniques have successfully been applied to the modeling of cellular communication services. They focus on defining efficient models for simulation, on the study of protocols or on the performance analysis of resource allocation algorithms. In this thesis, we continue the research in this domain by defining a model focusing on simulation accuracy. We will also test the limits on the size of the application model that can be simulated. Two channel allocation techniques are implemented. The first is based on fixed channel allocation and the second on a technique known as channel segregation. The latter technique requires that interference data be computed. For this purpose, we describe a brute force interference calculation algorithm. (Abstract shortened by UMI.)
11
Robinson, Craig. "Optimisation of Bluetooth wireless personal area networks". Thesis, Durham University, 2004. http://etheses.dur.ac.uk/2822/.
Testo completoAbstract (sommario):
In recent years there has been a marked growth in the use of wireless cellular telephones, PCs and the Internet. This proliferation of information technology has hastened the advent of wireless networks which aim to increase the accessibility and reach of communications devices. Ambient Intelligence (Ami) is a vision of the future of computing in which all kinds of everyday objects will contain intelligence. To be effective, Ami requires Ubiquitous Computing and Communication, the latter being enabled by wireless networking. The IEEE's 802.11 task group has developed a series of radio based replacements for the familiar wired ethernet LAN. At the same time another IEEE standards task group, 802.15, together with a number of industry consortia, has introduced a new level of wireless networking based upon short range, ad-hoc connections. Currently, the most significant of these new Wireless Personal Area Network (WPAN) standards is Bluetooth, one of the first of the enabling technologies of Ami to be commercially available. Bluetooth operates in the internationally unlicensed Industrial, Scientific and Medical (ISM) band at 2.4 GHz. unfortunately, this spectrum is particularly crowded. It is also used by: WiFi (IEEE 802.11); a new WPAN standard called Zig- Bee; many types of simple devices such as garage door openers; and is polluted by unintentional radiators. The success of a radio specification for ubiquitous wireless communications is, therefore, dependant upon a robust tolerance to high levels of electromagnetic noise. This thesis addresses the optimisation of low power WPANs in this context, with particular reference to the physical layer radio specification of the Bluetooth system.
12
Huang, Xin. "Multi-channel security protocols in personal networks". Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:e0217f2f-4b8f-4ee4-bb34-03cd03e6f68b.
Testo completoAbstract (sommario):
Personal computing devices are becoming more and more popular. These devices are able to collaborate with each other using wireless communication technologies, and then support many applications. Some interesting examples of these are healthcare, context-aware computing, and sports training. In any such applications, security is of vital importance. Firstly, sensitive personal data is always collected in these applications, thus confidentiality is usually required. Secondly, authenticity and integrity of data or instructions are always critical; incorrect data or instructions are not only useless, but also harmful in some cases. This thesis analyses the security requirements of personal networks, and develops a number of multi-channel security protocols. With the help of out-of-band channels, especially no-spoofing and no-blocking out-of-band channels, these protocols can bootstrap security in personal networks. In particular, three kinds of security protocols have been studied: protocols that use human-controlled channels, protocols that use visible light communications, and protocols that use intra-body communications. Interesting trade-offs have been discovered among communication, computation and security, resulting from different channel implementations and protocols.
13
Ghader, Majid. "Service discovery and use in personal networks". Thesis, University of Surrey, 2008. http://epubs.surrey.ac.uk/842849/.
Testo completoAbstract (sommario):
Personal and Body Area Networks (PAN/BAN) are spontaneously formed through the participation of a number of devices, using wireless technologies. They are considered to be components of larger Personal Networks (PN), which include clusters formed at a user's points of interest. In such a dynamic environment, a Service Discovery (SD) process is required for the detection of participating devices and their offered services and capabilities. In the course of this research, SD requirements in wireless personal networks were identified and the suitability of some of the existing protocols was investigated. Contributions of the research are listed below. 1) New PN Service Discovery and Management Platform (PNSDP & PNSMP): This is a generic platform that considers the characteristics of PNs, and is inter-operable with Bluetooth Service Discovery Protocol (SDP), Simple Service Discovery Protocol (SSDP) of Universal Plug and Play (UPnP) and Service Location Protocol (SLP). Furthermore, a new solution for enabling IP Multimedia Subsystem (IMS) and Service Session Management in PNs was proposed. 2) Optimised structure for PNSDP: An analytical evaluation was performed to aid in the proposal of the optimised structure for PNSDP. The results suggest that the most appropriate solutions are registry-based discovery within the clusters, peer-to-peer discovery in the infrastructure network, and the use of the binary format for SD messaging. 3) Interoperability between SD legacy protocols within PNSDP: The results of an experimental evaluation of the performance of the Bluetooth SDP suggest that it is better to use the search operation instead of the browse. In ad hoc networks, the SD time and the success rate (SR) of the SSDP were evaluated (through computing simulations) employing different levels and types of background traffics, showing the non-sensitivity of the SD time to congestion. A new (single- and multi-PAN) mobility model was proposed and the SLP was evaluated in terms of the SR, SD time and cost. One of the important results in using registry-based SLP was the increasing of the SR by ~60% at an energy cost increase of ~25% in the multi-PAN case. 4) Enhanced SLP (ESLP): Three new techniques were proposed and evaluated: sleep mode for the service nodes (ESLPi), multi-tier discovery for the convergence algorithm (ESLP2), and scope-based clustering (ESLP3). The achieved results indicate a reduction in energy expenditure of up to 3-5%, as well as a lower SD time in ESLP1 and ESLP3 and a higher SR in ESLP3.
14
Mackie, David Sean. "Extending the reach of personal area networks by transporting Bluetooth communications over IP networks". Thesis, Rhodes University, 2007. http://hdl.handle.net/10962/d1006551.
Testo completoAbstract (sommario):
This thesis presents an investigation of how to extend the reach of a Bluetooth personal area network by introducing the concept of Bluetooth Hotspots. Currently two Bluetooth devices cannot communicate with each other unless they are within radio range, since Bluetooth is designed as a cable-replacement technology for wireless communications over short ranges. An investigation was done into the feasibility of creating Bluetooth hotspots that allow distant Bluetooth devices to communicate with each other by transporting their communications between these hotspots via an alternative network infrastructure such as an IP network. Two approaches were investigated, masquerading of remote devices by the local hotspot to allow seamless communications and proxying services on remote devices by providing them on a local hotspot using a distributed service discovery database. The latter approach was used to develop applications capable of transporting Bluetooth’s RFCOMM and L2CAP protocols. Quantitative tests were performed to establish the throughput performance and latency of these transport applications. Furthermore, a number of selected Bluetooth services were tested which lead us to conclude that most data-based protocols can be transported by the system.
15
Konovalov, Oleg. "Personal networks in Russian business : structure, rules, trust". Thesis, Durham University, 2011. http://etheses.dur.ac.uk/3254/.
Testo completoAbstract (sommario):
The phenomenon of personal networks in Russian business received inadequate attention from academics to-date even being historically an important part of Russian cultural and business life. To break into Russian market strategic opportunities must be examined. Personal networks play a big role in achieving this, more so than institutions in creation of social capital in Russia. Butler and Purchase (2008) confirm that dynamic changes in the Russian political economy during the 1990s led to a unique combination of low levels of social capital at the general (state) level and very high levels of social capital at the interpersonal level; and highlight how critical developing social capital is to ensure long-term continuous business survival in Russia. At the same time being in control of a lot of resources, personal networks that exist in Russian business remain a mystery for Western businesses. Exploring the phenomenon from inside this descriptive doctoral study is using a chance of accessing hidden from previous researchers’ research data and advance understanding of the phenomenon of Russian personal networks inner life, norms, and rules. Having defined personal networks existing in Russian business present study confirms more complex structure of relations and different to those offered by Granovetter (1973); defines trust and explains how trust develops and mature; explains the role of emotional attachment which makes Russian networks so different; exploring importance of fulfilment of social norms which defines how networks operate. The findings show that it is not easy to establish relations in Russia but those relations will last longer providing network members with group’s emotional and functional support, and access to different resources. The phenomenon of “shadow” business groups existing in Russian business had been explored and discussed. Present doctoral study provides deeper understanding of Russian business networks helping foreign practitioners and investors to conduct business more effectively in Russia and particularly specialists in organisational change, strategy, strategic marketing, and HRM.
16
Persson, Karl E. "A PROTOCOL SUITE FOR WIRELESS PERSONAL AREA NETWORKS". UKnowledge, 2009. http://uknowledge.uky.edu/gradschool_diss/698.
Testo completoAbstract (sommario):
A Wireless Personal Area Network (WPAN) is an ad hoc network that consists of devices that surround an individual or an object. Bluetooth® technology is especially suitable for formation of WPANs due to the pervasiveness of devices with Bluetooth® chipsets, its operation in the unlicensed Industrial, Scientific, Medical (ISM) frequency band, and its interference resilience. Bluetooth® technology has great potential to become the de facto standard for communication between heterogeneous devices in WPANs.
The piconet, which is the basic Bluetooth® networking unit, utilizes a Master/Slave (MS) configuration that permits only a single master and up to seven active slave devices. This structure limitation prevents Bluetooth® devices from directly participating in larger Mobile Ad Hoc Networks (MANETs) and Wireless Personal Area Networks (WPANs). In order to build larger Bluetooth® topologies, called scatternets, individual piconets must be interconnected. Since each piconet has a unique frequency hopping sequence, piconet interconnections are done by allowing some nodes, called bridges, to participate in more than one piconet. These bridge nodes divide their time between piconets by switching between Frequency Hopping (FH) channels and synchronizing to the piconet's master.
In this dissertation we address scatternet formation, routing, and security to make Bluetooth® scatternet communication feasible. We define criteria for efficient scatternet topologies, describe characteristics of different scatternet topology models as well as compare and contrast their properties, classify existing scatternet formation approaches based on the aforementioned models, and propose a distributed scatternet formation algorithm that efficiently forms a scatternet topology and is resilient to node failures.
We propose a hybrid routing algorithm, using a bridge link agnostic approach, that provides on-demand discovery of destination devices by their address or by the services that devices provide to their peers, by extending the Service Discovery Protocol (SDP) to scatternets.
We also propose a link level security scheme that provides secure communication between adjacent piconet masters, within what we call an Extended Scatternet Neighborhood (ESN).
17
Ali, R. "Improving forwarding mechanisms for mobile personal area networks". Thesis, University College London (University of London), 2011. http://discovery.ucl.ac.uk/1301268/.
Testo completoAbstract (sommario):
This thesis presents novel methods for improving forwarding mechanisms for personal area networks. Personal area networks are formed by interconnecting personal devices such as personal digital assistants, portable multimedia devices, digital cameras and laptop computers, in an ad hoc fashion. These devices are typically characterised by low complexity hardware, low memory and are usually batterypowered. Protocols and mechanisms developed for general ad hoc networking cannot be directly applied to personal area networks as they are not optimised to suit their specific constraints. The work presented herein proposes solutions for improving error control and routing over personal area networks, which are very important ingredients to the good functioning of the network. The proposed Packet Error Correction (PEC) technique resends only a subset of the transmitted packets, thereby reducing the overhead, while ensuring improved error rates. PEC adapts the number of re-transmissible packets to the conditions of the channel so that unnecessary retransmissions are avoided. It is shown by means of computer simulation that PEC behaves better, in terms of error reduction and overhead, than traditional error control mechanisms, which means that it is adequate for low-power personal devices. The proposed C2HR routing protocol, on the other hand, is designed such that the network lifetime is maximised. This is achieved by forwarding packets through the most energy efficient paths. C2HR is a hybrid routing protocol in the sense that it employs table-driven (proactive) as well as on-demand (reactive) components. Proactive routes are the primary routes, i.e., packets are forwarded through those paths when the network is stable; however, in case of failures, the protocol searches for alternative routes on-demand, through which data is routed temporarily. The advantage of C2HR is that data can still be forwarded even when routing is re-converging, thereby increasing the throughput. Simulation results show that the proposed routing method is more energy efficient than traditional least hops routing, and results in higher data throughput. C2HR relies on a network leader for collecting and distributing topology information, which in turn requires an estimate of the underlying topology. Thus, this thesis also proposes a new cooperative leader election algorithm and techniques for estimating network characteristics in mobile environments. The proposed solutions are simulated under various conditions and demonstrate appreciable behaviour.
18
Liu, Liang Qui. "Dynamic anticipatory mobility management for personal communication networks". Thesis, University of Bristol, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284844.
Testo completo
19
Fredrik, Schlyter. "Predicting Personal Taxi Destinations Using Artificial Neural Networks". Thesis, Linköpings universitet, Statistik och maskininlärning, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-148427.
Testo completoAbstract (sommario):
Taxi Stockholm is a Swedish taxi company which would like to improve their mobile phone application with a destination prediction feature. This thesis has created an algo- rithm which predicts a destination to which a taxi customer would like to go. The problem is approached using the KDD process and data mining methods. A dataset consisting of previous taxi rides is cleaned, transformed, and then used to evaluate the performance of three machine learning models. More specifically a neural network model paired with K- Means clustering, a random forest model, and a k-nearest neighbour model. The results show that the models that were developed in this thesis could be used as a first step in a destination prediction system. The results also show that personal data increase the accu- racy of the neural network model and that there exists a threshold for how much personal information is needed to increase the performance.
20
He, Xiaoping. "The signalling system in satellite personal communication networks". Thesis, University of Surrey, 1996. http://epubs.surrey.ac.uk/844181/.
Testo completoAbstract (sommario):
Recent advances in both satellite and terrestrial mobile communications technologies are now leading to the realisation of the dream of the global personal communications within a few years. Satellite systems, as a complement to terrestrial cellular systems, are introduced into the future Personal Communication Networks (S-PCN) to provide global coverage and to allow global roaming. The inter-working and the integration between the satellite and the terrestrial cellular systems (e.g. GSM system) are the key issues in developing the network architecture and designing the control functions and signalling protocols of satellite systems. This thesis focuses on the design of a satellite signalling control system. The coverage and link properties of ICO10 and LE066 satellite constellations, the representatives of low earth orbit (LEO) and medium earth orbit (MEO) satellite systems, are considered. A satellite specific network architecture is proposed to accommodate the requirements of satellite dynamics and resource control function. The physical layer of satellite signalling links are designed to cope with the specific features of LEO or MEO satellite air-interfaces. In order to overcome problems specific to LEO or MEO satellite systems and to provide call set-up control function, three important signalling protocols are proposed for the S-PCNs. The priority based fast access scheme is designed for the satellite random access channel allowing low access delay for the call set-up related access packets, even when the channel load is high. The satellite diversity based paging approach is proposed to optimize the paging performance. The modified selective re-transmission (M-SRT) and Go-Back-N (M-GBN) protocols are proposed to cope with the transaction type transmission on the dedicated control channel. Simulation results have shown siginficant improvement of the M-SRT and M-GBN protocols in call setup delay. Two protocols are also compared in the aspects of implementation complexity and call set-up performance. Finally, the integration scenarios between satellite and GSM system have been examined for S-PCN in the call handling related functions and associated signalling protocols. The GSM higher layer signalling protocols are tailored to provide the call control related functions. The optimum integration scenario is derived under the criterion of minimum modifications to the GSM higher layer signalling protocols and minimum complexities of the control functions.
21
Sammut, Anthony J. R. "Radio resource management for satellite personal communication networks". Thesis, University of Surrey, 1999. http://epubs.surrey.ac.uk/843349/.
Testo completoAbstract (sommario):
A novel flexible channel allocation scheme is proposed which is applicable to medium altitude, high diversity satellite personal communication systems with an interconnected ground control segment. The scheme is built upon the establishment of several temporal master-slave network hierarchies in distinct areas of the Earth, whereby the control of radio resources in each area is granted to a single network entity, the master, located at one of the network's fixed earth station sites. The master station is entrusted with the radio resource management functionality equivalent to a base station controller in GSM, whereas the slaves, which consist of all FES sites which control satellites that have a current connectivity with the master's area, share the functionality of a GSM base transceiver station with the satellites under their control. The master maintains a table of all channel allocations within its control area in real-time, its objective is to maximise the number of channels which can be provided in its area, in response to channel requests by users, subject to known interference criteria. It can achieve this by optimising the existing and future channel allocations through the use of predictive satellite coverage, spotbeam gain models and genetic algorithms. Radio resource related signalling between master and slave stations is performed through a dedicated terrestrial fibre-optic network which interconnects the FES sites, based upon GSM interface specifications which are adapted to account for the increased propagation delays and signalling load associated with the regional network. The potential capacity gain which is available through a centralised optimisation approach over a fixed channel allocation scheme is determined through simulation. The instantaneous capacity of each scheme is highly dependent on the traffic distribution and the positions of the satellites, which causes an analytical approach to be too restrictive or simplistic. The capacity gain estimation is performed over a time period for which several samples are taken and a powerful adapted genetic algorithm is applied to the NP complete problem to determine the maximum capacity. The flexible dynamic system, entitled the hybrid-centralised DCA scheme, is shown to have a raw capacity potential in excess of the FCA scheme under the traffic distribution scenario adopted.
22
Pampalona, Tarrés Judith. "Be good with your neighbours. Support networks of immigrant entrepreneurs in a microstate". Doctoral thesis, Universitat Autònoma de Barcelona, 2017. http://hdl.handle.net/10803/456029.
Testo completoAbstract (sommario):
El campo del empresariado inmigrante ha sido ampliamente estudiado a lo largo de las últimas décadas (Solé y Parella, 2005; Villares- Varela, 2010), contribuyendo a la literatura con estudios centrados en las motivaciones y estrategias de los inmigrantes para iniciar y sacar adelante nuevos negocios en el país de destinación. Además, algunos estudios también ponen énfasis en la importancia de los contactos y las redes de soporte, tanto en el momento de la puesta en marcha como durante todo el desarrollo del negocio (Granovetter, 1983; Valenzuela- García et al., 2014). En este sentido, el modelo teórico de mixed embeddedness (arraigo mixto) propuesto por Kloosterman, Van der Leun y Rath (1999) defiende la importancia de las relaciones y el arraigo simultáneo de los emprendedores inmigrantes a distintos ámbitos institucionales, económicos y sociales, tanto en la comunidad de acogida como en la comunidad local y transnacional de compatriotas. Sin embargo, la mayoría de estos estudios se han centrado en regiones o ciudades que forman parte de países más extensos (García-Macías, 2013; Sommer & Gamper, 2017) y se ha puesto poca atención a los contextos de microestado, que están caracterizados por una estructura de oportunidades más reducida y por sistemas legislativos que presentan particularidades específicas.
Esta tesis doctoral está enfocada hacia los negocios regentados por inmigrantes en un microestado, más concretamente en el Principado de Andorra. El principal objetivo de la investigación es observar los efectos que tienen las particularidades de los contextos microestado sobre la estructura y la composición de las redes de soporte de los emprendedores, tanto inmigrantes como nacidos en Andorra. Para ello, han sido entrevistados treinta y tres emprendedores inmigrantes y diez emprendedores nativos, todos ellos establecidos en Andorra. La investigación se ha basado en una entrevista semi- estructurada, combinada con una parte estructurada que ha permitido delinear y comparar las redes personales de los emprendedores.
Los resultados obtenidos muestran que las ayudas fronterizas provienen sobretodo de colaboraciones en el ámbito empresarial, aportando sobretodo soporte logístico. En este sentido, cabe diferenciar a los contactos transfronterizos de los transnacionales, quién también aportan soporte logístico pero de otra naturaleza, dado que el marco geográfico en este caso es mucho más amplio e ilimitado. En términos generales, los contactos establecidos en Andorra son el grupo que aporta más soporte en las redes de los emprendedores inmigrantes. Este grupo de contactos se compone tanto por individuos nacidos en Andorra como por inmigrantes y principalmente tienen el rol de socios mayoritarios, consejeros legales y/o administrativos y prestanombres. Finalmente, los contactos transnacionales tienen más presencia en las redes de los nuevos emprendedores inmigrantes.
También el tamaño reducido del país y su estructura de oportunidades tienen efectos sobre las redes estudiadas, que muestran valores altos de densidad y bajos indicadores de centralización. Esto facilita a los emprendedores el acceso a la estructura de oportunidades, pero también supone una limitación para el crecimiento de los negocios, teniendo en cuenta que los recursos existentes son menos exclusivos. Esto hace necesario establecer contactos en distintos ámbitos sociales y geográficos para acceder a nuevas oportunidades.
En este sentido, tanto las redes de los emprendedores inmigrantes como las de los fronterizos mostraban un arraigo mixto (mixed embeddedness). Este indicador ha sido observado en negocios en todos los niveles de crecimiento, dado que todas las redes muestran una proporción de nativos, compatriotas y otros inmigrantes establecidos en Andorra en mayor o menor medida; así como una mayor o menor proporción de contactos transnacionales. Es interesante ver, en este sentido, como no solamente las redes de los inmigrantes muestran mixed embeddedness, sino que las redes de los nativos andorranos muestran patrones muy similares. Este resultado indica que esta teoría no es, por lo tanto, aplicable a contextos de microestado, debido a que que existen patrones de relaciones muy similares en las redes personales de los inmigrantes y los nativos.The field of immigrant entrepreneurship has been widely studied along the last decades (Solé & Parella, 2005; Villares- Varela, 2010), contributing to the literature with studies about motivations and strategies of immigrants to start up and develop new entrepreneurial activities in the destination country. Literature about personal and social networks further contributes in this field, emphasizing on the relevance of contacts and support networks for business starting up, development and success (Granovetter, 1983; Valenzuela- García et al., 2014). In this vein, the mixed embeddedness model proposed by Kloosterman, Van der Leun and Rath (1999) postulates the importance of the embeddedness in different institutional, economic and social backgrounds of the host community, as well as in both transnational and local co-national communities. However, all these studies have only been conducted in larger nations, or in particular regions or cities within larger nations (García- Macías, 2013; Solano, 2016; Sommer &Gamper, 2017). Nevertheless, little attention has been paid to microstates so far, which are characterized by a smaller opportunity structure and by distinctive legislative systems. This dissertation is thus focused on businesses managed by immigrants in a microstate, more precisely in the Principality of Andorra. The main purpose of the research is to observe the effects of the particularities of a microstate on the structure and composition of migrant and non-migrant entrepreneurial networks. Thirty three immigrant and ten native entrepreneurs have been interviewed in this research, all of them holding businesses in the Principality of Andorra. Data collection has been based on a semi- structured interviewing, which was combined with some elements of structured interviewing, in order to delineate and analyze the entrepreneurs’ personal support networks. Results show that cross-border support comes mainly from business-oriented collaborations, which mainly provide logistic support. Cross- border contacts need to be differentiate from transnationals, which also provide mainly logistic support, although their aids seem to be of a different nature since transnational relations are settled in a further and unlimited area. In general terms, contacts settled in Andorra provide main support for immigrant entrepreneurs’ networks. This group of contacts is made up by both native Andorrans and non-Andorrans, mainly developing the role of major shareholders, legal/administrative advisers and figureheads. Finally, transnational contacts are more relevant in networks of new immigrant entrepreneurs, those not having created their businesses under legislative restrictions, so they did not found limitations for starting up their ventures. On the other hand, the clearest influence of the small jurisdictional area is the small size of the population, which also implies a small opportunity structure. Entrepreneurs’ networks reveal high density values and therefore low betweenness centralization. This facilitates access to the opportunity structure, although it also make resources of this structure more accessible and thus less exclusive, which could be seen as a limitation for business growth. This highlights the need of adding contacts from different social and geographical backgrounds, regardless of growth stage the business is in or the social group of the entrepreneur. Therefore, both immigrant and cross- border entrepreneurs of this research were found to have a mixed embeddedness in terms of their social networks. This was observed in businesses of all growth stages, since the networks of all the groups show a proportion of natives, compatriots and other immigrants settled in Andorra, as well as a proportion of transnational contacts. Interestingly, not only immigrant networks show mixed embeddedness, but very similar patterns of mixed embeddedness were found among Andorran natives’ networks. This result indicates that this theory is therefore not applicable in microstates, since similar relation patterns exist in both personal networks of immigrants and natives.
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Nilsson, Joackim. "Dynamic Personal Networks for Location-Based Applications : Within MediaSense". Thesis, Mid Sweden University, Department of Information Technology and Media, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-11782.
Testo completoAbstract (sommario):
As the development of context aware applications has evolved, there has been a corresponding increase in need for more sophisticated system. The aim for this thesis is the development of a dynamical P2P network system which is based on locations. The P2P network is self organizing and in a lightweight format. Modern technical solutions including AGPS have facilitated the work associated with the ability to position users and modern mathematical solutions such as spherical trigonometry provides the P2P system with the necessary accuracy even for short distances. The P2P system works on different Java platforms including JSE, JME and Android. Unfortunately the 3G network distributor has not yet solved a NAT traversal problem, which means that the P2P network self organization and architecture has only been proved by means of simulations. Another problem is that certain mathematical formulas are required for the spherical trigonometry and the limitation for JME is that it is unable to handle inverse trigonometry. However, the Android and JSE versions can form a correct P2P network, under the condition that the Android device uses a WIFI connection point outside the 3G distributor network system. This thesis reports the successful testing of the locations-based P2P network.
MediaSense
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Huang, Pi. "Wireless personal area networks and free-space optical links". Thesis, Bournemouth University, 2006. http://eprints.bournemouth.ac.uk/338/.
Testo completoAbstract (sommario):
This thesis is concerned with the link layer design of indoor (IrDA) and outdoor infrared links, as well as the performance of the higher layers of two major Wireless Personal Area Network (WPAN) technologies: IrDA and Bluetooth. Recent advancesin wireless technology have made it possible to put networking technology into small portable devices. During the past few years, WPAN technologies have been the subject of a tremendous growth both in research and development. Although many studies have been conducted on wireless links to address different issues on physical and link layers, wireless communications are still characterised by high error rates becauseof the frequently changing medium. On the other hand, performance studies of the higher layers are also very important. In this thesis, for the first time, a comprehensivestudy of the interactions betweenthe higher and the lower protocol layers of IrDA and Bluetooth has been carried out to improve the overall system performance. Mathematical models for the link layers are introduced for the infrared systems: infrared data association (IrDA) and free space optics (FSO). A model for the IrDA (indoor infrared) link layer is developed by considering the presence of bit errors. Based on this model, the effect of propagation delay on the link through put is investigated. An optimization study is also carried out to maximize the link throughput. FSO (outdoor infrared) links are often characterized by high speed and long link distance. A mathematical model for the FSO link layer is also developed. Significant improvement of the link throughput is achieved by optimizing the link parameters. Based on the link layer model, the performance of the IrDA higher layers (transport, session and application layers) is investigated. First, a mathematical model of TinyTP (transport protocol) is elaborated and subsequently verified by simulations. The effects of multiple connections and available buffer size are investigated. The throughput at the TinyTP level is optimized for different buffer sizes. Subsequently, the session layer, including Object Exchange (OBEX) and IrDA Burst (IrBurst) protocols, is studied and modelled. The derived mathematical model is verified by simulation results. A set of protocol parameters and hardware selection guidelines is proposed to optimize the overall system performance while also keeping the hardware requirementto a minimum. Finally, two rapidly developing IrDA applications, IrDA financial messaging(IrFM) and IrDA simple connection (IrSC), are studied. IrFM is investigated by comparison to other digital payment technologies, while the performance of IrSC is compared in two different technical approaches. In order to improve the throughput and minimize the transmission delay for the Bluetooth data applications, a systematic analysis is carried out for the Bluetooth Logical Link Control and Adaptation Layer Protocol (L2CAP). L2CAP is layered above the Bluetooth link layer (Baseband) and is essential to Bluetooth data applications. A simple and intuitive mathematical model is developed to derive simple equations for the L2CAP throughput and the average packet delay. The derived throughput equation, which is validated by simulations, takes into account bit errors as well as packet retry limits. Finally, a number of easy-to-implement performance enhancement schemes are proposed, including the optimum use of the protocol parameters.
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McDermott, Todd P. (Todd Patrick) Carleton University Dissertation Engineering Systems and Computer. "Personal communications networks and call interception for law enforcement". Ottawa, 1994.
Cerca il testo completo
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Zimmerman, Thoams Guthrie. "Personal area networks (PAN) : near-field intra-body communication". Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/29101.
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Biswas, Subir Kumar. "Handling realtime traffic in mobile networks". Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320943.
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Tebje, Lars. "Kabellose Datenübertragung am menschlichen Körper - neuartige Prinzipien für body area networks (BANs)". Berlin : Logos-Verl, 2006. http://deposit.d-nb.de/cgi-bin/dokserv?id=2850262&prov=M&dokv̲ar=1&doke̲xt=htm.
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Chan, Ka-Lok. "Intra and inter piconet scheduling in Bluetooth personal area networks /". View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?COMP%202003%20CHANK.
Testo completoAbstract (sommario):
Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2003.Includes bibliographical references (leaves 79-81). Also available in electronic version. Access restricted to campus users.
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Perumana, Bevin George. "Low-power CMOS front-ends for wireless personal area networks". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/26712.
Testo completoAbstract (sommario):
Thesis (Ph.D)--Electrical and Computer Engineering, Georgia Institute of Technology, 2008.Committee Chair: Laskar, Joy; Committee Member: Chakraborty, Sudipto; Committee Member: Chang, Jae Joon; Committee Member: Divan, Deepakraj; Committee Member: Kornegay, Kevin; Committee Member: Tentzeris, Emmanouil. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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Fylan, Gwynn Elizabeth Margaret Mary. "Medicines management after hospital discharge : patients' personal and professional networks". Thesis, University of Bradford, 2015. http://hdl.handle.net/10454/14465.
Testo completoAbstract (sommario):
Improving the safety of medicines management when people leave hospital is an international priority. There is evidence that poor co-ordination of medicines between providers can cause preventable harm to patients, yet there is insufficient evidence of the structure and function of the medicines management system that patients experience. This research used a mixed-methods social network analysis to determine the structure, content and function of that system as experienced by patients. Patients’ networks comprised a range of loosely connected healthcare professionals in different organisations and informal, personal contacts. Networks performed multiple functions, including health condition management, and orienting patients concerning their medicines. Some patients experienced safety incidents as a function of their networks. Staff discharging patients from hospital were also observed. Contributory factors that were found to risk the safety of patients’ discharge with medicines included active failures, individual factors and local working conditions. System defences involving staff and patients were also observed. The study identified how patients often co-ordinated a system that lacked personalisation and there is a need to provide more consistent support for patients’ self-management of medicines after they leave hospital. This could be achieved through interventions that include patients’ informal contacts in supporting their medicines use, enhancing their resilience to preventable harm, and developing and testing the role of a ‘medicines key worker’ in safely managing the transfer of care. The role of GP practices in co-ordinating the involvement of multiple professionals in patient polypharmacy needs to be further explored.
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Lin, Tao. "Personal social networks, neighborhood social environments and activity-travel behavior". HKBU Institutional Repository, 2015. https://repository.hkbu.edu.hk/etd_oa/224.
Testo completoAbstract (sommario):
Rapidly rising levels of car ownership in newly developed economies and increasing travel demand worldwide over the past several decades have intensified the negative externalities of transportation, such as traffic congestion and air pollution. To develop policies that mitigate these problems through managing and controlling travel demand, it is important to have a comprehensive understanding of the determinants of individuals’ activity-travel behavior. A considerable amount of research has been conducted around the impact of the built environment on travel behavior. As well, over the past decade, the social contexts of travel have gradually been recognized as important explanatory factors of activity-travel behavior. Thus, the link between social contexts and activity-travel behavior has become a much discussed research topic recently. This study aims to contribute to this growing literature by investigating three important but under-explored areas related to the connection between social contexts and activity-travel behavior: 1) how social network attributes influence the choice of companions for conducting daily activities and travel; 2) how personal social networks and neighborhood social environments influence activity location choices and time use; and 3) how the dynamics of social networks and changes in residential social environments induce activity-travel behavior changes as a result of home relocation. This study adopts a longitudinal design and uses both cross-sectional data and longitudinal panel data. Multivariate modelling approaches including Structure Equation Modelling (SEM), multilevel logistic regression and a doubly censored Tobit model are employed. Findings from this study show that social network variables are significant determinants in explaining individuals’ engagements in joint/solo activities/travel and choices of companions for joint activities. Social network attributes and neighborhood social environments are also found to significantly influence individuals’ choices between in- and out-of-neighborhood locations for activities and time use. The study also demonstrates that changes in travel after residential relocation are induced by changes both in the built and social environments as well as the geography of social networks. These findings contribute to the knowledge about the social contexts of activity-travel behavior.
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Fylan, Beth. "Medicines Management after Hospital Discharge: Patients’ Personal and Professional Networks". Thesis, University of Bradford, 2015. http://hdl.handle.net/10454/14465.
Testo completoAbstract (sommario):
Improving the safety of medicines management when people leave hospital is an international priority. There is evidence that poor co-ordination of medicines between providers can cause preventable harm to patients, yet there is insufficient evidence of the structure and function of the medicines management system that patients experience. This research used a mixed-methods social network analysis to determine the structure, content and function of that system as experienced by patients. Patients’ networks comprised a range of loosely connected healthcare professionals in different organisations and informal, personal contacts. Networks performed multiple functions, including health condition management, and orienting patients concerning their medicines. Some patients experienced safety incidents as a function of their networks. Staff discharging patients from hospital were also observed. Contributory factors that were found to risk the safety of patients’ discharge with medicines included active failures, individual factors and local working conditions. System defences involving staff and patients were also observed. The study identified how patients often co-ordinated a system that lacked personalisation and there is a need to provide more consistent support for patients’ self-management of medicines after they leave hospital. This could be achieved through interventions that include patients’ informal contacts in supporting their medicines use, enhancing their resilience to preventable harm, and developing and testing the role of a ‘medicines key worker’ in safely managing the transfer of care. The role of GP practices in co-ordinating the involvement of multiple professionals in patient polypharmacy needs to be further explored.University of Bradford studentship
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Wang, Qihe. "Scheduling and Simulation of Large Scale Wireless Personal Area Networks". University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1148050113.
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TOSHNIWAL, RISHI. "DYNAMIC CONFIGURATION AND LOAD BALANCING IN BLUETOOTH PERSONAL AREA NETWORKS". University of Cincinnati / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1037911162.
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Rosen, Joel Louis. "Friends with benefits : an investigation into the social dynamics of network creation in the born-global SME". Diss., University of Pretoria, 2012. http://hdl.handle.net/2263/22826.
Testo completoAbstract (sommario):
Previous literature on the social dynamics of network creation in enterprises has drawn a sharp division between the utility of personal and professional networks. This has been particularly marked in social network analysis of born-global SMEs operating in emerging markets and seeking to internationalise. Using the case study of International Housing Solutions (Pty) Ltd (IHS) – a born global SME with both a global and a regional network – this research creates a deeper and more nuanced understanding of what such networks look like, what human factors are key to their operation, and what the relative importance is of the personal and professional drivers of networking.The study employs a mixed-method research design including network mapping and both qualitative and quantitative analysis of questionnaire responses from 35 participants in the IHS network, providing both hard data and rich qualitative insights into the ingredients and processes required for effective networking in such an enterprise.The results provide robust evidence for crossover between professional and personal networking activities; both are equally relevant in enabling the born-global SME to grow networks, increase innovation and enter otherwise impenetrable markets. Though the weighting of networking attributes is marginally different – for personal networks, the key attributes are advice, trust, friendship and communication; for professional networks, knowledge and referrals – in practice, both the personal and the professional are assimilated into a single complex of network activity and cannot be viewed in isolation.The research thus contributes innovative findings to a hitherto under-researched aspect of networking in the born-global SME.Dissertation (MBA)--University of Pretoria, 2012.
Gordon Institute of Business Science (GIBS)
unrestricted
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Wahab, Junaid, e Zubair Ali. "Improved Energy Modelling of Wireless Personal Area Network". Thesis, Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-2615.
Testo completoAbstract (sommario):
Wireless sensors networks are used in a variety of environments ranging from environment
monitoring such as humidity and temperature, to environments like patient monitoring, habitat
monitoring etc. Sometimes sensors are deployed in inaccessible or hazardous places, and they
are battery operated; recharging or changing the sensor’s battery is almost impossible.
In such scenarios, where the battery can not be recharged or changed, it is crucial to know in
advance how long the battery will last so that the old sensor node can be replaced by a new
one. Normally, in order to effectively utilize the battery the components of a wireless sensor
node are turned off when not needed.
This paper presents an in-depth analysis of the importance of switching sensor node
components, and its impact on the life time prediction. A new energy model is presented
which caters for the current and time consumed in switching from one mode to another. A
comparison is made between scenarios where current consumption while switching is catered
with the one where it is not catered. This was achieved by using on chip fuel gauge, with
some limitation, which was verified by using digital multimeter.
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Daptardar, Aniruddha Shriram. "Meshes and cubes distributed scatternet formations for bluetooth personal area networks /". Online access for everyone, 2004. http://www.dissertations.wsu.edu/Thesis/Spring2004/A%5FDaptardar%5F050404.pdf.
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Grande, Pablo De. "Personal networks and locus of control in large urban centers of Argentina". Pontificia Universidad Católica del Perú, 2013. http://repositorio.pucp.edu.pe/index/handle/123456789/100188.
Testo completoAbstract (sommario):
This study analyzes the relationship between locus of control and interpersonal relations structures in Argentina. After a representative sample (n = 1500) of households in seven major urban centers (>200,000 inhabitants), it examines the relationship between the externality of locus of control and different aspects of personal networks of each respondent. The results show that people having more relations experiment lower levels of externality of locus of control. Likewise, lower levels of externality are informed when personal ties outside the neighborhood are available, as well as ties high educational level. In this regard, significant associations are verified between control and personal relations structures.El presente estudio se propone analizar la relación entre la representación del locus de control y las estructuras de vínculos interpersonales en la Argentina. A partir de una muestra (n=1500) de hogares representativa de siete grandes centros urbanos (>200 mil habitantes) se examina la relación entre la externalidad del locus de control y diferentes aspectos de las redes personales de cada participante. Los resultados muestran que a mayor cantidad de relaciones disponibles se encuentran niveles inferiores de externalidad del locus de control, así como también menores niveles de externalidad al disponerse de lazos interpersonales fuera del barrio y con vínculos de nivel socioeducativo alto. En este sentido, se verifican asociaciones significativas entre representación de control del entorno y estructuras vinculares.
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Eller, Linda S. "Social media as avenue for personal learning for educators: Personal learning networks encourage application of knowledge and skills". PEPPERDINE UNIVERSITY, 2012. http://pqdtopen.proquest.com/#viewpdf?dispub=3498101.
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Karavanov, Anna. "Factors affecting entrapment bias justification needs, face concerns and personal networks /". College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/3505.
Testo completoAbstract (sommario):
Thesis (Ph. D.) -- University of Maryland, College Park, 2006.Thesis research directed by: Communication. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Ma, Junkang. "Ubiquitous communications for wireless personal area networks in a heterogeneous environment". Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/6497.
Testo completoAbstract (sommario):
The widespread use of wireless technologies has led to a tremendous development in wireless communication systems. Currently, an individual mobile user may carry multiple personal devices with multiple wireless interfaces, which can interconnect with each other to form a Wireless Personal Area Network (WPAN) which moves with this user. These devices exist in a heterogeneous environment which is composed of various wireless networks with differing coverage and access technologies and also the topology, device conditions and wireless connections in the WPAN may be dynamically changing. Such individual mobile users require ubiquitous communications anytime, anywhere, with any device and wish content to be efficiently and continuously transferred across the various wireless networks both outside and inside WPANs, wherever they move. This thesis presents research carried out into how to implement ubiquitous communications for WPANs in such an environment. Two main issues are considered. The first is how to initiate content transfer and keep it continuous, no matter which wireless network is used as a user moves or how the WPAN changes dynamically. The second is how to implement this transfer in the most efficient way: selecting the most suitable transfer mode for a WPAN according to the user’s and application’s requirements. User-centric (personal-area-centric) and contentcentric mechanisms are proposed in this thesis to address these issues. A scheme based on a Personal Distributed Environment (PDE) concept and designed as a logical user-based management entity is presented. This is based on three mechanisms which are proposed to overcome the technical problems in practical scenarios, which cannot be solved by existing approaches. A novel mechanism is proposed to combine local direct and global mobile communications, in order to implement ubiquitous communications in both infrastructure-less and infrastructurebased networks. This enables an individual user’s ubiquitous communications to be initiated in an infrastructure-less network environment and kept continuous when they move across infrastructure-based networks. Its advantages are evaluated by a performance analysis model and compared to existing solutions and verified by experiments. A cooperation and management scheme is also proposed for dynamic changes of multiple mobile routers and flexible switching of personal device roles in a WPAN while keeping ongoing ubiquitous communications continuous. This adopts a novel view of WPANs which solves the addressing problems caused by changes of mobile routers and makes these transparent to personal devices in the WPAN and external content sources. It provides an efficient method for changing the mobile router of a single WPAN or a WPAN merging with another moving network. Its benefits are demonstrated through performance analysis models. Finally, a novel user-centric and contentcentric mechanism for decision making, to select the most appropriate mobile router in a dynamically changing WPAN environment is proposed. This selects the most suitable content transfer mode for the WPAN to fulfil an individual user’s various requirements. It has different strategies to suit various types of applications. Selection results are demonstrated to verify the proposed mechanism in multiple scenarios of changing user requirements, applications and WPAN conditions.
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DUGGIRALA, RANGANATH. "EFFICIENT BRIDGE NEGOTIATION AND MANAGEMENT FOR BLUETOOTH-BASED PERSONAL AREA NETWORKS". University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1076334358.
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Kanter, Theo. "Adaptive Personal Mobile Communication, Service Architecture and Protocols". Doctoral thesis, KTH, Microelectronics and Information Technology, IMIT, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3273.
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Yu, Sam Shaokai. "Performance analysis and call control procedures in high-speed multimedia personal wireless communications /". Title page, abstract and contents only, 1999. http://web4.library.adelaide.edu.au/theses/09PH/09phy936.pdf.
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Carinus, Suzaan. "Articulating a personal social media strategy". Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/95672.
Testo completoAbstract (sommario):
Thesis (MBA)--Stellenbosch University, 2012.ENGLISH ABSTRACT: History and statistics confirm that social media and the internet has come a long way and is bound to keep evolving and growing in the future. But many opposing views and criticism surround the ubiquitous use thereof. One’s personal social media strategy is the basis of personal branding. Managing the strategy pro-actively and creatively is thus very important. The report gives a quick overview of the web key concepts, technologies and tools currently available for social media participation. These tools are grouped by looking at various current social media classification frameworks that exist. Alas, classification must also somehow make provision for forthcoming platforms – and is thus not conclusive. A discussion of the latest technological, digital and social media trends and adoption factors were also included. Knowledge of the trends influence the personal social media strategy formulation heavily. Intermediaries can also assist to provide the required knowledge or experience and also more extensive services if chosen, because creating content is much different from merely consuming it and the technologies, tools and trends change incredibly fast. Several case studies were analysed to gain insights about guidelines, etiquette, risks, challenges and achievements in the social media arena. The various lessons demonstrated the importance of establishing guidelines for social media participation. The case studies further demonstrated that the level of transparency the world has now, won’t support having different identities for a person. Everybody need to understand and accept the societal shift and adjust their behaviour accordingly, if they want to achieve success in the digital arena. This is also of the essence to CEO’s – as their companies will increasingly require their involvement in the social media arena, in order to remain relevant. All the relevant factors were taken into consideration in order to compile a suggested framework for personal social media strategy compilation. Following the framework, not as a recipe but as a mere guideline, will assist individuals to draw up their own personal social media strategy. The strategy consists of four phases, namely planning, organising, execution and monitoring and are set out with several building blocks contained in each, as well as advice on how to approach each building block. Despite the formality of the given framework, it is imperative to remember to have fun – if the creator is not, the audience certainly also won’t and all the effort will most definitely be wasted. Key words: Personal social media strategy; Social media; Social networking; Social media guidelines; Personal social media strategy framework
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Aydinli, Aykut. "Interface Design: Personal Preference Analysis". Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12610035/index.pdf.
Testo completoAbstract (sommario):
This thesis analyzes the relationship between users&rsquocharacteristics and users&rsquo
interface preferences. An online survey is developed for this study. This survey composed of two types of questions: (1) users&rsquo
personal information such as age, gender, country, cognitive structure, and also computer experience and (2) user interface elements. More than 2,500 participants from 120 different countries throughout the world completed our survey. Results were analyzed using cross tables. Our findings show that there is a relationship between users&rsquo
characteristics and users&rsquo
interface preferences. In the presence of this relationship, an artificial neural network model is developed for the estimation of the interface preferences based on the user characteristics.
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Alim, Sophia. "Vulnerability in online social network profiles : a framework for measuring consequences of information disclosure in online social networks". Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5507.
Testo completoAbstract (sommario):
The increase in online social network (OSN) usage has led to personal details known as attributes being readily displayed in OSN profiles. This can lead to the profile owners being vulnerable to privacy and social engineering attacks which include identity theft, stalking and re identification by linking. Due to a need to address privacy in OSNs, this thesis presents a framework to quantify the vulnerability of a user's OSN profile. Vulnerability is defined as the likelihood that the personal details displayed on an OSN profile will spread due to the actions of the profile owner and their friends in regards to information disclosure. The vulnerability measure consists of three components. The individual vulnerability is calculated by allocating weights to profile attribute values disclosed and neighbourhood features which may contribute towards the personal vulnerability of the profile user. The relative vulnerability is the collective vulnerability of the profiles' friends. The absolute vulnerability is the overall profile vulnerability which considers the individual and relative vulnerabilities. The first part of the framework details a data retrieval approach to extract MySpace profile data to test the vulnerability algorithm using real cases. The profile structure presented significant extraction problems because of the dynamic nature of the OSN. Issues of the usability of a standard dataset including ethical concerns are discussed. Application of the vulnerability measure on extracted data emphasised how so called 'private profiles' are not immune to vulnerability issues. This is because some profile details can still be displayed on private profiles. The second part of the framework presents the normalisation of the measure, in the context of a formal approach which includes the development of axioms and validation of the measure but with a larger dataset of profiles. The axioms highlight that changes in the presented list of profile attributes, and the attributes' weights in making the profile vulnerable, affect the individual vulnerability of a profile. iii Validation of the measure showed that vulnerability involving OSN profiles does occur and this provides a good basis for other researchers to build on the measure further. The novelty of this vulnerability measure is that it takes into account not just the attributes presented on each individual profile but features of the profiles' neighbourhood.
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Pelica, Rita Alexandra Oliveira. "Análise qualitativa sobre a relação existente entre os conceitos de networking e de marketing pessoal". Master's thesis, Instituto Superior de Economia e Gestão, 2011. http://hdl.handle.net/10400.5/4598.
Testo completoAbstract (sommario):
Mestrado em MarketingNa sociedade de conhecimento em que vivemos, networking e marketing pessoal são conceitos muito actuais, a julgar pelo crescente número de iniciativas que têm surgido a nível global. Verifica-se que os portugueses são early adopters, não só pela utilização e adaptação no mercado português de conceitos e plataformas já testados internacionalmente, como no desenvolvimento de iniciativas próprias (empreendedorismo 100% português), tanto a nível presencial (por ex., na organização e participação em workshops e eventos), como online (nas designadas redes sociais e plataformas de colaboração). Falar de networking implica falar de marketing pessoal, na perspectiva de que este é um marketing de referências, de word of mouth e de partilha, resultante das relações que se criam e que são fortalecidas social e profissionalmente, tendo em vista a "qualidade dos relacionamentos". Cada indivíduo deve definir se quer ser encarado como líder ou como participante nos círculos de influência nos quais se insere. Face à escassez de literatura científica existente sobre a relação entre estes dois conceitos, academicamente detectou-se a oportunidade de investigar a natureza dessa relação. Foi realizada uma investigação qualitativa e exploratória, para se procurar obter uma perspectiva portuguesa. As questões de investigação que se colocaram evidenciaram que (1) o networking é utilizado, consciente e objectivamente, como ferramenta de marketing pessoal; (2) os indivíduos têm uma clara noção da importância da sua marca pessoal (personal brand); (3) existem motivações subjacentes ao desenvolvimento das actividades de networking; (4) há características, competências e valores pessoais associados ao perfil pessoal de um networker; (5) os indivíduos criam, mantêm e actualizam as suas redes pessoais para atingirem determinados objectivos (pessoais e/ou profissionais); (6) existem benefícios reais que os networkers têm retirado das suas actividades; (7) existem várias ferramentas de networking (presenciais e online) utilizadas por networkers portugueses.
In the knowledge society we are living in, networking and personal marketing are quite actual concepts, judging from the rising number of initiatives that have appeared at a global level. The Portuguese people are early adopters, not only just for using and adapting to the Portuguese market concepts and platforms internationally tested, but also developing initiatives of their own (100% Portuguese entrepreneurship), in a presential manner (for instance, organizing and participating in workshops and events) and online (on the social networks and collaboration platforms). Talking about networking implies talking about personal marketing, in the perspective that this is a referral marketing, of word of mouth and sharing, resulting from the relationships that are build and grow socially and professionally, on the pursuit of the relationships quality. Each individual should define if he wants to be considered a leader or a participant on the influential circles where he stands. Due to the lack of scientific literature about the existing relationship between these two concepts, academically was detected the opportunity to investigate the nature of this relationship. It was conducted a qualitative and exploratory research, in order to get a Portuguese perspective. The formulated research questions highlighted that (1) networking is used, conscious and objectively, as a personal marketing tool; (2) individuals have a clear notion of the importance of their personal brand; (3) there are motivations underneath the development of networking activities; (4) there are characteristics, skills and personal values associated to the personal profile of a networker; (5) individuals build, maintain and update their personal networks to achieve determinate objectives (personal and/or professional); (6) there are real benefits that networkers have obtained from their activities; (7) there are several networking tools (presential and online) used by the Portuguese networkers.
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Herborn, Stephen Electrical Engineering & Telecommunications Faculty of Engineering UNSW. "PACMAN: a personal-network centric approach to context and mobility aware networking". Awarded by:University of New South Wales. Electrical Engineering and Telecommunications, 2006. http://handle.unsw.edu.au/1959.4/31217.
Testo completoAbstract (sommario):
Users (or software agents) are served by multiple networked terminal devices, each of which may in turn have multiple network interfaces. This multi-homing at both ???user??? and ???device??? level presents new opportunities for mobility handling. Mobility may be handled by switching ongoing application data streams between devices, by utilising intermediary adaptation or connectivity enhancement services, or both. However this requires middleware support that is not provided by current systems. This thesis presents a set of integrated solutions to enable this kind of mobility handling, based on concept of Personal Networks (PN). Personal Networks (PN) consist of dynamic conglomerations of terminal and service devices tasked to facilitate the delivery of information to and from a single focal point, which may be a human user or software agent. This concept creates the potential to view mobility handling as a path selection problem, since there may be multiple valid terminal device and service proxy configurations that can successfully carry a given communication session from one PN to another PN. Depending on context, it may be necessary to switch between paths. To this end, this thesis proposes and evaluates a set of inter-dependent mechanisms to facilitate the discovery and use of different candidate end-to-end paths. The proposal comprises mechanisms for secure inter-device mobility using delegated cryptographic identifiers, autonomous service proxy selection and composition, and distributed resolution of cryptographic identifiers to lower layer addresses.