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Dissertations / Theses on the topic 'Hierarchical cellular'

Author: Grafiati

Published: 4 June 2021

Last updated: 2 February 2022

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1

Williams, Brian Geoffrey. "Hierarchical and cellular structures in cosmology." Thesis, University of Edinburgh, 1992. http://hdl.handle.net/1842/27678.

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Though great advances have been made in the field of cosmology by using numerical <i>n</i>-body techniques to investigate large-scale structure formation, these have been hampered by limited dynamic range. Thus there still remains considerable motivation for finding simple methods that link either the final structure or its statistical properties (such as mass and correlation functions) to the initial conditions. This thesis investigates two such approaches - linear theory and the Voronoi foam. <i>(i) Linear Theory</i> This is based on the principle of smoothing the non-linear density field in

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2

Karlsson, Robert S. "Radio resource sharing in hierarchical cellular systems /." Stockholm, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3200.

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3

Giang, Truong Minh Triet, and trietgiang@yahoo com. "Efficient Admission Control Schemes in Cellular IP Networks." RMIT University. Electrical and Computer Engineering, 2006. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20060829.113000.

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The thesis reviews current admission control schemes in cellular IP networks. It proposes an improved version of Threshold Access Sharing and a new scheme: weight-based scheme. Finally, an admission control scheme for hierarchical cellular network is introduced.

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Borchardt, Lars, Claudia Hoffmann, Martin Oschatz, Lars Mammitzsch, Uwe Petasch, Mathias Herrmann, and Stefan Kaskel. "Preparation and application of cellular and nanoporous carbides." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-138910.

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A tutorial review on cellular as well as nanoporous carbides covering their structure, synthesis and potential applications. Especially new carbide materials with a hierarchical pore structure are in focus. As a central theme silicon carbide based materials are picked out, but also titanium, tungsten and boron carbides, as well as carbide-derived carbons, are part of this review<br>Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich

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Borchardt, Lars, Claudia Hoffmann, Martin Oschatz, Lars Mammitzsch, Uwe Petasch, Mathias Herrmann, and Stefan Kaskel. "Preparation and application of cellular and nanoporous carbides." Royal Society of Chemistry, 2012. https://tud.qucosa.de/id/qucosa%3A27792.

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A tutorial review on cellular as well as nanoporous carbides covering their structure, synthesis and potential applications. Especially new carbide materials with a hierarchical pore structure are in focus. As a central theme silicon carbide based materials are picked out, but also titanium, tungsten and boron carbides, as well as carbide-derived carbons, are part of this review.<br>Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.

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Režnáková, Ema. "Příprava a charakterizace lehčených polymerních materiálů s hierarchickou celulární strukturou." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2020. http://www.nusl.cz/ntk/nusl-414127.

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The asymmetrical arrangement of cellular structure allows for an accurate functional adaptation at all levels of hierarchy, which derives excellent features for the development of new materials. The main objective of introducing a hierarchy into cellular structures is to improve the mechanical behaviour of the material while maintaining its elastic properties. A part of this work is devoted to the literature review related to the lightened cellular polymeric materials with hierarchical cellular structure. The rest is focused on the preparation of PLA based polymer structures using 3D printing,

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Zabanoot, Zaid Ahmed Said. "Modelling and Analysis of Resource Management Schemes in Wireless Networks. Analytical Models and Performance Evaluation of Handoff Schemes and Resource Re-Allocation in Homogeneous and Heterogeneous Wireless Cellular Networks." Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5383.

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Over recent years, wireless communication systems have been experiencing a dramatic and continuous growth in the number of subscribers, thus placing extra demands on system capacity. At the same time, keeping Quality of Service (QoS) at an acceptable level is a critical concern and a challenge to the wireless network designer. In this sense, performance analysis must be the first step in designing or improving a network. Thus, powerful mathematical tools for analysing most of the performance metrics in the network are required. A good modelling and analysis of the wireless cellular networks wi

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8

Ou, Xiaoxia. "Developing hierarchically structured catalysts on cellular foams for continuous flow catalysis." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/developing-hierarchically-structured-catalysts-on-cellular-foams-for-continuous-flow-catalysis(e3fb780b-5212-4428-894d-288d4b819c6c).html.

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The development of modern chemical and environmental industry requires novel reactor concepts to enable the transfer of catalysts developed in laboratories into the industrial context. The applications of structured reactors/catalysts such as cellular foams are one of the most promising technologies that can facilitate this crucial step. Open-cell foams with stochastically interconnected cells and high porosities (>60%) can promote the low pressure drop during operation and improve the transport phenomena, overtaking the conventional fixed beds for continuous flow catalysis. In this PhD projec

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Genovese, Sara. "Emergence and regulation of cell hierarchy in a Drosophila model of neuro-developmental tumor." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0482.

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Dans les tumeurs hiérarchiques, les cellules souches du cancer (CSC), au sommet de la hiérarchie tumorale, peuvent s'auto-renouveler et se différencier en progéniteurs amplificateurs transitoires (TAP) avec un potentiel d'auto-renouvellement limité. Au cours du développement, les cellules souches neurales de Drosophile, appelées neuroblastes (NB), expriment en séquence deux protéines antagonistes se liant à l'ARN, Imp et Syncrip (Syp), qui respectivement favorise et réprime l'auto-renouvellement des NB. La perturbation de mécanismes de division asymétrique des NB peut générer leur amplificatio

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10

Deschanels, Fabrice. "Pilotage d'une cellule flexible d'usinage." Besançon, 1989. http://www.theses.fr/1989BESA2013.

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On propose un modèle organisationnel de la cellule et du poste base sur la notion d'élément productif constitue par les matériels et logiciels spécifiques a une activité et décompose en un système de communication, de décision et d'application, ce dernier assurant la commande des éléments hiérarchiques inférieurs et la détection des dysfonctionnements

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HAJHOUJ, MOUAMD. "Programmation hors ligne : emulation des composants d'une cellule robotisee." Paris, ENSAM, 1988. http://www.theses.fr/1988ENAM0005.

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On traite du cas d'une cellule robotisee comportant plusieurs chaines cinematiques. Le module d'execution gene la synchronisation et la communication entr les differentes taches. Le passage au robot reel montre que l'emulation de la commande elimine les erreurs dues a l'utilisation d'algorithmes generaux

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Lo, Kuen-Rong, and 羅坤榮. "Channel Assignment Schemes for Hierarchical Cellular Systems." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/84177540136138851638.

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博士<br>國立交通大學<br>電子工程系<br>88<br>In this dissertation, channel assignment schemes of hierarchical cellular systems with overlaying macrocells and overlaid microcells are studied. First, a combined channel assignment (CCA) mechanism is proposed. The objective of the proposed CCA mechanism is to reduce the new-call blocking probability, decrease forced termination probability, and increase the channel utilization for the whole system. The proposed CCA mechanism combines overflow, underflow, and reversible schemes to redu

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Lin, Yung-Chun, and 林湧鈞. "Repacking on Demand for Hierarchical Cellular Networks." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/18481228547125557489.

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碩士<br>國立交通大學<br>資訊工程系<br>91<br>In mobile telecommunications operation, radio channels are scarce resources and should be carefully assigned. One possibility is to deploy the hierarchical cellular network (HCN). This thesis studies a HCN channel assignment scheme called repacking on demand (RoD). RoD was originally proposed for wireless local loop networks. We expend this work to accommodate mobile networks. Moreover, for non-speed-sensitive and speed-sensitive cases, we propose different channel assignment and repacking procedures for RoD.

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14

Ying-Yu, Chen. "Prioritized Handoff Dynamic Channel Allocation in Hierarchical Cellular Systems." 2000. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0021-2603200719110569.

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Li, Min-Tsang, and 李敏滄. "Soft Handoff Queueing Strategy in Hierarchical Cellular CDMA Network." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/50255207567756895012.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>90<br>The key goals of the next generation wireless networks include high utilization of frequency spectrum, improvement of quality of service and provision of various multimedia services. Code division multiple access (CDMA) cellular communication systems utilize diversity technology to perform soft handoff. Compared to break-before-make hard handoff, make-before-break soft handoff can provide higher quality of service during handoff. On the other hand, mobile users can possess different mobility, e.g., move at vehicular or pedestrian speed. If the cell size is too

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Chen, Ying-Yu, and 陳瀅羽. "Prioritized Handoff Dynamic Channel Allocation in Hierarchical Cellular Systems." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/5y56yt.

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碩士<br>國立臺灣師範大學<br>資訊教育研究所<br>89<br>We propose a channel assignment strategy, called Hierarchical cellular system - Prioritized Handoff Dynamic Channel Allocation strategy (HPHDCA), for use in hierarchical cellular networks, in which channel resources are shared by both tiers of cells. The HPHDCA is essentially a DCA scheme with additional operational features including prioritized-handoff, local-packing, reservation-sharing and overflow. In distributed operation environment, these features are achieved through looking up channel status maintained in an ACOR table. The ACOR table is developed t

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Ho, Chia-hui, and 何家卉. "Multiuser Beamforming and Opportunistic Scheduling for Transparent Hierarchical Cellular Systems." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/xzn49r.

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碩士<br>國立中央大學<br>通訊工程學系<br>102<br>The idea of cognitive radio (CR) has embodied concretely in hierarchical cellular systems by deploying an underlying microcellular system to reuse the underutilized spectrum licensed by a macrocellular system. The fundamental challenges for successfully realizing such hierarchical systems are to manage the intercell interference between the macrocell and microcell and to pursue the goal of maximizing the spectrum recycling efficiency. Recently, the idea of interference alignment has been emerged to utilize the spatial dimension offered by multiple antennas to o

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Lu, Ssu-Han, and 呂思翰. "Smart Antenna Techniques for Interference Management in Hierarchical Cellular Systems." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/34864371791740949996.

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博士<br>國立交通大學<br>電信工程研究所<br>102<br>With the increasing demand for high data rates service, macro-cell and small cell coexist hierarchical cellular architecture become an extremely important issue which can improve signal quality of cell edge users and offer huge spectrum efficiency gain in current and future wireless communication systems. In such hierarchical cellular systems, the spectrum efficiency can be further enhanced by managing the inter-cell interference (ICI) between macro-cells and small cells. In this dissertation, we investigate smart multiple-input multiple-output (MIMO) antenna

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Tsai, Chia-Sheng, and 蔡佳勝. "Radio Resource Allocation Strategies for Satellite and Hierarchical Cellular Systems." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/65344825687537801616.

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博士<br>國立成功大學<br>電機工程學系碩博士班<br>91<br>Future IMT-2000 (International Mobile Telecommunications after the year 2000) are expected to be integrated by terrestrial and satellite components to provide a seamless, wide rang of coverage areas, system capacity, and available service types for personal communications. In the space segment, low-earth orbit (LEO) satellite based systems are preferred with the consideration of some technical issues such as transmission delay, path loss, antenna aize, etc.. However, because of the short period for which the satellites are visible, users of LEO satellite sy

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HUANG, JUN-REN, and 黃俊仁. "A dynamic hierarchical structure for cellular mobile packet radio networks." Thesis, 1990. http://ndltd.ncl.edu.tw/handle/05805902050524902353.

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Tsai, Chi-Hao, and 蔡祈豪. "The Effect of Channel Connection Pool Techniquewith CDMA Based Hierarchical Cellular Network." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/27462903226066542682.

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碩士<br>大同大學<br>資訊工程學系(所)<br>97<br>Nowadays, both wireless network technology and coverage are widely developing and more mature. 3G or upcoming 4G cell based wireless network is the infrastructure in order to provide more high speed network services. No doubt, a large number of multimedia applications and more voice calls will consume more bandwidth as well as channel resources. An efficient channel assignment scheme could increase resources utilization and decrease drop rate and blocking rate. Therefore, the hierarchical cellular network is proposed for solving this issue. According to the bas

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Lue, Yan-Nan, and 劉彥男. "The Efficiency of Self-adaptive Subrating Channel Assignment for Hierarchical Cellular Network." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/16769052986355015472.

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碩士<br>大同大學<br>資訊工程學系(所)<br>99<br>Hierarchical Cellular Network architecture (HCN) is the most common architecture that widely used in the mobile telecommunications operation. Channel assignment is the key issue to improve System performance. Different kind of traffic types is applicable to recent proposed methods such as guard channel, overflow and subrating. But in real world, these traffics are intermixture. A fuzzy model for Self-adaptive Subrating Channel Assignment could trigger subrating ratio and overflow method. In the complex traffic environment, this channel assignment strategy can p

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Lin, Yi-Liang, and 林奕良. "Cell Site Selection for CDMA Hierarchical Cellular System with Multi-Class Traffic." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/93189464063020437122.

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碩士<br>國立交通大學<br>電信工程系<br>90<br>CDMA is one of the most potential techniques in the third generation mobile communication system because of its resistance of interference and high frequency efficiency. Because the CDMA system can serve many users with various services requirements at the same time, radio resource management (RRM) becomes a very important issue. The goal of this thesis is to study cell site selection technique for hierarchical CDMA networks with multi class traffic. Data services, such as WWW, E-mail and video, etc, will become primary services in the next generation

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Lai, Wen-Pin, and 賴文彬. "Time Domain Coordination for Intercell Interference Reduction in LTE Hierarchical Cellular Systems." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/96239642963758103965.

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碩士<br>國立交通大學<br>電信工程研究所<br>101<br>In this thesis, we present an interference-aware slot allocation technique for improve the system performance of the low-power pico-cells and overlaying macro-cells. In the 3rd Generation Partnership Project (3GPP) Long-Term Evolution- Advanced (LTE-A), this kind of interference between pico-cells and its overlaying macro-cell is called the interference in heterogeneous network (HetNet), which will decrease the coverage area of pico-cells and overall system throughput. In the 3GPP LTE-A cellular system, enhanced inter-cell interference coordination (eICIC) tec

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Jhan, Jhih-Dao, and 詹志道. "Analysis of Hierarchical Cellular CDMA Networks for Intelligent Transportation Systems with Multimedia Services." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/12891521271039030055.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>93<br>We consider two-tier cellular CDMA networks for ITS (Intelligent Transpor- tation System), where mobile users can move in only one of two directions. Both narrowband voice service and broadband services are supported in the considered system. The broadband calls are assigned to the associated macrocell in order to reduce the times of handoff and the voice calls are assigned to the associated microcell. One guard channel scheme is implemented to prioritize handoff calls over new calls in the system. To avoid macrocell resource under-utilization, voice calls in m

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Chou, Yu-Yun, and 周雨韻. "A Study of the Hierarchical Cellular-Based Management Worked by Power-Aware Technology." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/k548ey.

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碩士<br>朝陽科技大學<br>資訊管理系碩士班<br>93<br>In recent years, people are more inclined to depend on wireless network services so that they may obtain latest information at any time anywhere. Of wireless networks, to effectively allow several or more mobile devices to send data with one another has become an important research topic. Our research carries the topic discussion under Mobile Ad-Hoc Network. MANET is one type of non-fixed infrastructure mobile networks and consists of many Mobile Hosts in which these can be cellular phones. The power consumption rate and bandwidth of each mobile host device be

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Yuan-Cheng, Chan. "A Hybrid Measurement-based Model for Hierarchical Location Area Design in Wireless Cellular Networks." 2006. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0009-1207200611535100.

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Chen, Yeu-An, and 陳禹安. "Joint Antenna Beamforming and Power Allocation for Hierarchical Non-Orthogonal Multiple Access Cellular System." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/sf3uce.

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碩士<br>國立中央大學<br>通訊工程學系<br>107<br>In this thesis, we investigate a hierarchical Non-orthogonal multiple access cellular system simultaneously shares the macrocell uplink spectrum with the microcell secondary user who is unlicensed. We also attempt the NOMA which is expected to improve the system capacity of wireless communication systems. We jointly design the allocated power and the beamforming weights for each downlink microcell user to maximize the capacity of the hierarchical NOMA cellular system. We consider two methods: (1) Using minimax decision theory to find the user rate. (2) Using th

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Chan, Yuan-Cheng, and 詹淵程. "A Hybrid Measurement-based Model for Hierarchical Location Area Design in Wireless Cellular Networks." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/27583323733810730720.

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碩士<br>元智大學<br>資訊工程學系<br>94<br>Location area design plays an important role to reduce the supererogatory traffic cost for location management which is due to rapidly increasing mobile users. This thesis proposes a hybrid measurement-based model to design the size of location area and group the cells into hierarchical location area architecture for minimizing signaling cost. By this proposed model, wireless cellular system would be assisted to improve traffic performance and traffic cost analysis of various network elements is included for optimizing location area design. The most appropriate si

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Huang, Pei-Ching, and 黃珮菁. "An H.263-based Hierarchical Coder and Packet Discard Policies for 3G Cellular Networks." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/69925105218985552575.

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Peng, Lin-Yi, and 彭令儀. "Fuzzy-based Cell Selection and Adaptive Repacking Strategy for Channel Assignment in Hierarchical Cellular Systems." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/56521897885795301368.

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碩士<br>國立臺灣師範大學<br>應用電子科技研究所<br>95<br>Since the traffic in mobile communication system increase rapidly, the radio channels are unable to meet the demand and must be assigned more accurately. It is possible to improve the channel allocation efficiency by upgrading the utility rate of spectrum. Further, the flexible application of hierarchical structure can be used to increase the coverage area and improve the utility rate of channels. In this thesis, Fuzzy Path Selector was developed to make path selection to meet the property of balanced-load cellular network. Fuzzy Cell Selector then was u

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Griffin, Paula Jean. "Biological network models for inferring mechanism of action, characterizing cellular phenotypes, and predicting drug response." Thesis, 2016. https://hdl.handle.net/2144/14516.

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A primary challenge in the analysis of high-throughput biological data is the abundance of correlated variables. A small change to a gene's expression or a protein's binding availability can cause significant downstream effects. The existence of such chain reactions presents challenges in numerous areas of analysis. By leveraging knowledge of the network interactions that underlie this type of data, we can often enable better understanding of biological phenomena. This dissertation will examine network-based statistical approaches to the problems of mechanism-of-action inference, characterizat

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Isik, Seckin Sinan. "Phosphoproteomic study on osmotic shock in Saccharomyces cerevisiae over sub-minute and half- hour timescales." Thèse, 2018. http://hdl.handle.net/1866/22274.

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