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Dissertations / Theses on the topic 'Cluster heads'

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Published: 3 June 2025
Last updated: 31 July 2025

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1

Song, Liumeng. "Cluster heads selection and cooperative nodes selection for cluster-based Internet of Things networks." Thesis, Queen Mary, University of London, 2017. http://qmro.qmul.ac.uk/xmlui/handle/123456789/24778.

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Clustering and cooperative transmission are the key enablers in power-constrained Internet of Things (IoT) networks. The challenges for power-constrained devices in IoT networks are to reduce the energy consumption and to guarantee the Quality of Service (QoS) provision. In this thesis, optimal node selection algorithms based on clustering and cooperative communication are proposed for different network scenarios, in particular: • The QoS-aware energy efficient cluster heads (CHs) selection algorithm in one-hop capillary networks. This algorithm selects the optimum set of CHs and construct clu
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Lim-Chan, Grace Cheow Yong. "The role of heads of department in cluster secondary schools in Singapore." Thesis, University of Leicester, 2007. http://hdl.handle.net/2381/30923.

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This study investigated the role of heads of department in Singapore cluster secondary schools against the backdrop of a major educational reform in the Singapore education system, namely, the implementation of the School Cluster system in 1997, and a host of new initiatives including self-appraisal of schools and performance appraisal in the education service. Heads of department in a school cluster participated in a questionnaire survey, and the findings were triangulated with data from interviews as well as documentary analysis. The study found that external educational policy changes such
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Ferreira, Leonardo Nascimento. "Técnica de agrupamento de dados baseada em redes complexas para o posicionamento de cluster heads em rede de sensores sem fio." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-18022013-162410/.

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Redes de Sensores Sem Fio são um tipo especial de rede ad-hoc que são posicionadas em uma região para monitorar fenômenos físicos. Considerando que os sensores dessas redes são independentes e possuem um raio de cobertura pequeno, é comum a utilização de um grande número de sensores para monitorar uma área grande. Um problema nesses tipos de redes é garantir que o máximo de dados capturados por esses sensores sejam coletados e transmitidos até uma estação base para que possam ser analisados por usuários. Uma abordagem para resolver esse problema é por meio da utilização de sensores especiais c
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Randriatsiferana, Rivo Sitraka A. "Optimisation énergétique des protocoles de communication des réseaux de capteurs sans fil." Thesis, La Réunion, 2014. http://www.theses.fr/2014LARE0019/document.

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Pour augmenter la durée de vie des réseaux de capteurs sans fil, une solution est d'améliorer l'efficacité énergétique des protocoles de communication. Le regroupement des nœuds du réseau de capteurs sans fil en cluster est l'une des meilleures méthodes. Cette thèse présente propose plusieurs améliorations en modifiant les paramètres du protocole de référence LEACH. Pour améliorer la distribution énergétique des "cluster-heads", nous proposons deux protocoles de clustering centralisés k-LEACH et sa version optimisée k-LEACH-VAR. Un algorithme distribué, appelé e-LEACH, est également proposé po
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Ahmed, Irfanuddin. "Energy Efficient Cluster Head Selection in Fixed Wireless Sensor Networks." ScholarWorks@UNO, 2006. http://scholarworks.uno.edu/td/476.

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Energy is the main bottleneck for wireless sensor networks and it has dominating effects on network lifetime. Sensors have finite energy and during the process of sensing and transmitting data to the cluster head they lose energy. Sensors that are furthest away from the cluster head require more energy than the closer ones. These losses of energy cause sensors to die faster, lower coverage area and hence network death. In this paper we investigate techniques to maximize the network lifetime by selecting the most optimal cluster head. The proposed technique is in context of cluster-based
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Vargas-Orellana, Julio. "A Distributed Approach for Global Product Lifecycle Management." Thesis, KTH, Radio Systems Laboratory (RS Lab), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-139105.

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Product Lifecycle Management (PLM) is a holistic approach for managing product information throughout its life cycle. It integrates different concepts that have emerged due to changes in the manufacturing process as a result of globalization, increased competition, demand for more innovative products, and other reasons. These changes have leaded to a shift from a model with a single-location for product development to a model in which a complex network of specialized companies collaborate. This global collaborative PLM implies that companies from different parts of the world work together and
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Abusaimeh, Hesham. "Energy-aware routing protocols in Wireless Sensor Networks." Thesis, Loughborough University, 2009. https://dspace.lboro.ac.uk/2134/8141.

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Saving energy and increasing network lifetime are significant challenges in the field of Wireless Sensor Networks (WSNs). Energy-aware routing protocols have been introduced for WSNs to overcome limitations of WSN including limited power resources and difficulties renewing or recharging sensor nodes batteries. Furthermore, the potentially inhospitable environments of sensor locations, in some applications, such as the bottom of the ocean, or inside tornados also have to be considered. ZigBee is one of the latest communication standards designed for WSNs based on the IEEE 802.15.4 standard. The
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Blacher, Zak. "Cluster-Slack Retention Characteristics: A Study of the NTFS Filesystem." Thesis, Karlstad University, Faculty of Economic Sciences, Communication and IT, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-6000.

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<p>This paper explores the statistical properties of microfragment recovery techniques used on NTFS filesystems in the use of digital forensics. A microfragment is the remnant file-data existing in the cluster slack after this file has been overwritten. The total amount of cluster slack is related to the size distribution of the overwriting files as well as to the size of cluster. Experiments have been performed by varying the size distributions of the overwriting files as well as the cluster sizes of the partition. These results are then compared with existing analytical models.</p><br>FIVES
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Almaharmah, Rani [Verfasser]. "Multi-Aware Cluster Head Maintenance for Mobile Ad Hoc Networks with Wireless Power Transfer Capabilities / Rani Almaharmah." München : Verlag Dr. Hut, 2016. http://d-nb.info/1111160376/34.

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10

Kulasinghe, Arutha Jeevana. "Circulating tumour cells in head and neck cancers." Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/110534/1/Arutha%20Jeevana_Kulasinghe_Thesis.pdf.

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Metastasis in head and neck cancer patients is responsible for over 50% of deaths. There are currently no tools to identify patients at risk of developing metastasis. Circulating tumour cells (CTC) represent a transient cancer cell population in the blood. In this study, the researcher has developed CTC isolation methodologies and used novel culture formulations to expand patient derived CTCs for therapy testing. Furthermore, the researcher identified biomarkers present on CTCs which could select patients for immunotherapies, a current unmet need. This work sets the foundation for a personaliz
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Abdul, Rehman Bin Omer. "Mobile Edge Computing Clustering Algorithms for Pedestrian Mobility Scenarios." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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The purpose of this study is to provide a general framework for the latest trends of mobile network architectures. Edge computing brings the computing capability of the cloud to the edge of the network for minimizing the latency. In the D2D mode, Fog Nodes interact with each other. With the help of clustering, Fog nodes are categorized into two types: Fog Cluster Head (FCH) and Fog Cluster Member (FCM). In each cluster, FCMs offload the task towards their respective FCHs for computation. The characterization of the performance of system model taking into account the average energy consumption,
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SILVA, Alexandre Márcio Melo da. "Controle energeticamente eficiente de múltiplos saltos para redes de sensores sem fio heterogêneas utilizando lógica fuzzy." Universidade Federal do Pará, 2014. http://repositorio.ufpa.br/jspui/handle/2011/9016.

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Submitted by Hellen Luz (hellencrisluz@gmail.com) on 2017-08-01T18:31:48Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Dissertacao_ControleEnergeticamenteEficiente.pdf: 1174753 bytes, checksum: 5cd54c6a58e7be0ea1b96f19908312ce (MD5)<br>Approved for entry into archive by Irvana Coutinho (irvana@ufpa.br) on 2017-08-22T13:01:13Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Dissertacao_ControleEnergeticamenteEficiente.pdf: 1174753 bytes, checksum: 5cd54c6a58e7be0ea1b96f19908312ce (MD5)<br>Made
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MACIEL, Christiano do Carmo de Oliveira. "Estratégia de redução de consumo de energia em redes de sensores sem fio heterogêneas utilizando lógica fuzzy." Universidade Federal do Pará, 2012. http://repositorio.ufpa.br/jspui/handle/2011/3373.

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Submitted by Irvana Coutinho (irvana@ufpa.br) on 2013-01-23T15:09:34Z No. of bitstreams: 2 license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Dissertacao_EstrategiaReducaoConsumo.pdf: 2434652 bytes, checksum: bf2428fb8f0caeaf3737a7f0ba4cd7e5 (MD5)<br>Approved for entry into archive by Ana Rosa Silva(arosa@ufpa.br) on 2013-01-23T17:11:16Z (GMT) No. of bitstreams: 2 license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Dissertacao_EstrategiaReducaoConsumo.pdf: 2434652 bytes, checksum: bf2428fb8f0caeaf3737a7f0ba4cd7e5 (MD5)<br>Made available in DS
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多叢集首之叢集式無線感測網路之研究 and 張景閔. "A study in clustered wireless sensor network with multiple cluster heads." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/34148298722435176903.

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碩士<br>聖約翰科技大學<br>電子工程系碩士班<br>101<br>Wireless sensor network is composed by a large number of sensor nodes and a base station. Sensor nodes have many advantages, such as: cheap cost, small size, low power, making a very broad range of applications of wireless sensor networks, whether it is in the military, sinister environment (such as volcanoes, deep-sea) medical, home, entertainment, and so you can see an example of the use of wireless sensor networks, sensor nodes are usually battery as its power source, the use in unattended or sinister environment, not through artificial way to replace the
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Shih, Ting-Yu, and 施庭宇. "On Selection of Cluster Heads in Cluster-based Wireless Sensor Networks." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/t9radc.

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碩士<br>國立交通大學<br>電信工程研究所<br>106<br>Machine to machine(M2M) communication is a key technology for 5G radio access. Wireless Sensor Networks we focus on here is a special use case in the M2M communication. Its characteristic is that the sensing devices or sensor nodes in the system are low mobility. With this characteristic, we can divide the field spread with sensor nodes into clusters and select a node in the cluster to be cluster head. The duty of cluster head is to aggregate the data or message from Non-head nodes(member nodes) and then transmit the data to the sink node (maybe an eNB). In th
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CHEN, HSIANG-CHUN, and 陳湘軍. "A Study on Indexing Cycle-based Clusters of the Matching Composition Network with Prescribed Cluster Heads." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/92476888455506362357.

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碩士<br>靜宜大學<br>資訊工程學系<br>104<br>For large-scale networking environments, grouping network nodes into clusters is a key technique to achieve the scalability objective. This thesis addresses cycle-based node clustering in network systems. Let r be a positive integer. For any r distinct vertices v_1 ,··· ,v_r of a network G= (V,E), G is said to be spanning (v_1 ,··· ,v_r)-cyclable if there exists a set of r vertex-disjoint cycles C_1,··· ,C_r in G such that min{l(C_1),···,l(C_r)}≥ 4, ∑_(i=1)^r▒〖C_i=|V|〗, and v_i ∈ V (C_i ) for 1 ≤ i ≤ r, where ℓ(Ci) denotes the length of cycle C_i, |V | is the
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Lin, Jia-Wei, and 林家維. "Distributed Fault Detection of Wireless Sensor Networks Based on Cluster Heads." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/55018221539202473566.

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碩士<br>國立暨南國際大學<br>資訊工程學系<br>98<br>Since the high development of wireless sensor networks, the real condition of the event can be known according to the information reported from sensor nodes and does not need to be seen by ourselves. In this approach, people can make a decision to reduce the damage to us via the information reported from sensor nodes. A wireless sensor network (WSN) consists of a large number of tiny sensor nodes. A sensor node collects information from the environment like temperature, sound, vibration, pressure or humidity. The advantages of using sensor nodes are low cost a
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Chen, Tai-an, and 陳泰安. "An adaptive algorithm of Energy-Balanced cluster-heads selection in Wireless Sensor Networks." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/99798667370136986710.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>100<br>We propose a new clustering algorithm based on far and near cluster-heads selection mechanism which partition the sensing area into far and near regions. The selected coordinator can unify the cluster –heads in each round to solve the cluster-head collision problem. Furthermore, the selected coordinator can adaptively adjust the far and near regions to balance the energy consumption of the far and near regions, resulting in extending the life time of the sensor networks significantly. With the exclude distance of cluster-heads, cluster-heads can be distribute
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LIN, CHIEN HUNG, and 林建宏. "An Adaptive Algorithm of Energy-Balanced Cluster-Heads Selection with Dynamic Coordinator Election in Wireless Sensor Networks." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/82858708176465072417.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>101<br>In recent years, wireless sensor networks are extensively employed in the environment monitoring. It provides intensive environment monitoring in temporal and spatial respects, while the traditional environment monitoring can’t afford it. Due to the limited energy of sensor nodes, it is of researching goal that the lifetime of sensor networks is prolonged by transmitting the sensed data to the base station in the energy-saving way. We propose a new clustering algorithm (DC-ENBACH) based on two-stage cluster-heads selection mechanism which partition the sensin
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Jan, Mian Ahmad. "Energy-efficient routing and secure communication in wireless sensor networks." Thesis, 2016. http://hdl.handle.net/10453/43497.

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University of Technology Sydney. Faculty of Engineering and Information Technology.<br>Wireless Sensor Networks (WSNs) consist of miniature sensor nodes deployed to gather vital information about an area of interest. The ability of these networks to monitor remote and hostile locations has attracted a significant amount of research over the past decade. As a result of this research, WSNs have found their presence in a variety of applications such as industrial automation, habitat monitoring, healthcare, military surveillance and transportation. These networks have the ability to operate in hum
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Hung-ChiTsai and 蔡宏基. "Cluster Head Election in M2M Communications." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/80962503701641400154.

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碩士<br>國立成功大學<br>工程科學系<br>104<br>This thesis is based on machine to machine type communications to self form the cluster group and network. The idea was inspired by the growing popularity of smart phone, smart appliance, smart home, and smart grid. Because of the growing up number of machines will be huge, the huge number of data transfer will bring the serious collision in the machine type communications network. So we need an new mechanism to deal with the serious collision. There is a challenge in machine to machine communications which is the cluster formation of machine type communications
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Wu, Tein-Hui, and 吳典輝. "Equalization of Energy Consumption of Cluster Head for Cluster-Based Wireless Sensor Networks." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/96057060953211523557.

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碩士<br>朝陽科技大學<br>網路與通訊研究所<br>96<br>In cluster-based wireless sensor networks (WSNs), the most of energy is consumed in cluster head (CH) which performs data aggregations and relaying. The lifetime in cluster-based WSN is subjected by the lifetime of CHs. Therefore, in this paper, we equalize the energy consumption of the CHs to prolong the lifetime of WSNs. After equalization, we obtain the length of sides of cluster area. Numerical results show that the length of far site cluster is shorter than the nearest cluster to perform equalization for all three routing schemes. Moreover, the circular
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Tseng, Chi-Shung, and 曾志翔. "New Cluster-Head Selection Strategy in Wireless Sensor Network." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/58794030398617822227.

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碩士<br>國立成功大學<br>電機工程學系碩博士班<br>95<br>In sensor network, we focus on the energy-saving issues by the limited power and un-chargeable battery. In LEACH algorithm, the operation runs a model to divide the system into many clusters which has one cluster-head. The cluster-head nodes collect information transmitted from the cluster-members and do some process and relay the data to the base station far beyond. In LEACH algorithm, the cluster-head selection model has some drawbacks such as unstable number of cluster-head and unevenly distributed cluster-head. In this paper, we propose an improved clu
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Huang, Chi-ming, and 黃啟銘. "PERFORMANCE EVALUATION OF CLUSTER-HEAD SELECTION FOR WIRELESS SENSOR NETWORKS." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/41715731132835363322.

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碩士<br>大同大學<br>通訊工程研究所<br>97<br>In recent years, wireless distributed microsensor systems enable the reliable monitoring of a variety of environments for military applications. Clustering in the LEACH scheme for wireless sensor network is one of the important research issues. Although clustering can reduce more energy consumption than direct transmitting, selecting cluster heads randomly may increase the energy consumption due to the communication between each cluster member and its cluster head. In this thesis, we combine a cluster-head selection algorithm with cluster heads rotation to send d
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HUANG, YU-TING, and 黃郁婷. "An Improved Cluster Head Selection Approach to Mobile Sensor Networking Applications." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/s5r8s2.

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碩士<br>國立臺北科技大學<br>電機工程系<br>107<br>Since the invention of smart dust, wireless sensor networks has been widely concern. Especially in the well developed advancement of semiconductor manufacturing and wireless communication technologies, make more applied in daily life. However, well developed of IoT make WSN be widely discussed. The wireless sensor network is composed of sensing nodes. In reality, nodes are small in size and low in cost, and it has advantages of adaptability and fault tolerance. With the wireless sensing unit, many scenes that can’t be wiring is benefited to use. To select a pr
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MEHROTRA, SAURABH. "ENHANCED CLUSTER HEAD SELECTION STRATEGY FOR EFFICIENT ROUTING IN ADHOC NETWORK." Thesis, 2013. http://dspace.dtu.ac.in:8080/jspui/handle/repository/16154.

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present that users wanting to communicate with each other form a temporary network, without any form of centralized administration. Each node participating in the network acts both as host and a router therefore, it is capable of forwarding packets for other nodes. For this purpose a routing protocol is needed i.e. it should try to minimize control traffic, such as periodic update messages. Clustering in Mobile Ad Hoc Networks (MANETs) has many advantages compared to the traditional networks. But the highly dynamic and unstable nature of MANETs makes it difficult for the cluster based routi
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Tsai, Ming-Yu, and 蔡明宇. "A Virtual Cluster Head Election Clustering Scheme for Heterogeneous Wireless Sensor Network." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/40452842201892051861.

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碩士<br>國立交通大學<br>資訊科學與工程研究所<br>103<br>Wireless Sensor Networks (WSN) with lots of small sensor nodes can be used as an effective tool for gathering data in various environments. Cluster routing mechanisms provide an efficient way for prolonging the network lifetime and increase its stability. In the past, most researchers work hard on homogeneous WSNs, but the trend of heterogeneity of network nodes is unavoidable. Some researches try to get better performance by previous assumption of initial power and nodes ratio, but these mechanisms are not flexible enough. Besides, previous researches rare
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CHUANG, JING-SHIAUN, and 莊鈞翔. "Design of Area-Partitioned Clustering and Cluster Head Rotation for Wireless Sensor Networks." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/72170467431718674223.

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碩士<br>國立臺灣科技大學<br>資訊工程系<br>102<br>A wireless sensor network is composed of power-limited devices with constraints of size, condition, and etc. Due to impossibility to recharge or to replace the batteries of sensors, power control becomes a challenging issue in WSN. To prolong the network lifetime, clustering is one of viable approaches. Among the clustering approaches, static clustering avoids the energy consumption in periodical re-clustering. However, how to achieve balanced members in a cluster for static clustering forms another issue. In this thesis, an area-partitioned clustering with a
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Jiang, Bing-Shiuan, and 江秉軒. "An Improvement on Cluster-Head Selection of Leach Protocol in Wireless Sensor Networks." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/91354733158941081903.

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碩士<br>元智大學<br>資訊工程學系<br>98<br>Wireless Sensor Networks consist of a lot of sensor nodes. They can be applied to environmental monitor, traffic and military surveillance, …etc. Since the electrical powers of the sensor nodes are limited, how to extend the lifetime of the networks has become an important issue. Leach (Low-Energy Adaptive Clustering Hierarchy) is a clustering-based protocol. Due to its randomized selection of local cluster-heads, Leach has a drawback that the clusters are not evenly distributed and the power will be consumed quickly. In this thesis, we present an improved me
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ROHATGI, KSHITIZ. "ENERGY EFFICIENT CLUSTER BASED ADAPTIVE THRESHOLD SENSITIVE PROTOCOL IN WIRELESS SENSOR NETWORK." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14783.

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The Wireless Sensor Network consists of a large number of limited battery powered sensor nodes. These networks have wide range of applications related to areas like weather monitoring, forest monitoring, security and target monitoring, etc. The limited powered battery affects the network‟s lifetime. Various protocols have been developed to increase the network‟s lifetime. In this dissertation, we developed EECHR protocol, a clustering protocol for reactive network with threshold sensitive homogeneous sensor nodes. It includes an energy efficient cluster head selection and cluster formation tec
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Chiang, Su-Hua, and 江淑華. "Symptom Clusters in Post-operative Patients with Head and Neck Cancer." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/32450557860443654736.

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碩士<br>臺北醫學大學<br>護理學研究所<br>94<br>Abstract Symptoms may affect the function and quality of life of cancer patients and affect the patient’s compliance to cancer treatment. It’s commonly acknowledged for patients experienced pain、dry mouth、sleep disturbance during radiotherapy, but lack of knowledge about the symptom distress severity、symptom numbers and symptom cluster. A symptoms was highly prevalent across tumor types, the purpose of this study is to analysize the symptom cluster in operation head and neck cancer patients who receive radiotherapy from the first to sixth week by using a Longi
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SIOTRA, AASHISH. "AN ENERGY EFFICIENT ROUTING ALGORITHM BASED ON PRIORITY FOR WIRELESS SENSOR NETWORK." Thesis, 2018. http://dspace.dtu.ac.in:8080/jspui/handle/repository/16243.

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An efficient design for a Wireless Sensor Network has become a leading area of research nowadays. We have application of Wireless Sensor Networks in many areas like health care, remote area monitoring, Environmental sensing, Agriculture sector, Military operations. There are large number of challenges in Wireless Sensor network because of the areas in which these networks are deployed and the limited resources that we have in WSN. One of the main challenge in WSN is the efficient use of the limited power supply. All the protocols in WSN should be designed by keeping limited power supply constr
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Chien, Chih-teng, and 簡志騰. "A Study on Controlling Mechanisms for Saving Cluster Head Energy Consumption in Wireless Sensor Network." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/77611043958446928794.

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碩士<br>朝陽科技大學<br>資訊管理系碩士班<br>97<br>In wireless sensor networks, since the sensor nodes have limited available power, how to reduce energy consumption and efficiently use energy is one of most important issues. In this thesis, we propose a novel method, Weight-based Cluster Head Evaluation Method (WCHEM), to save power consumes. Through the evaluation mechanisms for optimal cluster heads, the regions are divided by the distribution of the energy loading evenly among the nodes in sensor networks. Traditional LEACH(Low Energy Adaptive Clustering Hierarchy) method will be added weight concepts to s
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Cheng, Wei-Liang, and 成威良. "An Improved Cluster Head Selection Algorithm Based on Fuzzy Logic System Using Expected Energy Consumption." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/s97w2v.

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碩士<br>國立臺北科技大學<br>電機工程系研究所<br>99<br>In wireless sensor networks (WSN), most nodes have limited energy for working, so WSN’s routing algorithm has to consider energy problem. For this, low energy adaptive clustering hierarchy (LEACH) solves energy problem by rotation as cluster head (CH), and be able to raise network energy efficiency. However LEACH uses random mechanism to select CH, the energy of selected node may not be enough to be the CH. To solve this problem, we have provided a novel CH selection algorithm. This algorithm uses expected energy consumption (EEC) and residual energy to
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Teng, Chih-Lin, and 鄧芝琳. "An Improved Cluster Head Selection Algorithm Based on Fuzzy Logic System for Mobile Sensor Networks." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/fxaz7m.

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碩士<br>國立臺北科技大學<br>電機工程系研究所<br>102<br>In recent years, more and more exploration of sensor networks are used in mobile network architecture. In the mobile environment, sensor nodes collect large amount of information, exchange and process. However, if the traditional static routing protocol was directly used in the mobile sensor networks, there will be no cluster head (CH) within the cluster because mobile sensor nodes and the network topology need to be rebuilt constantly to result in losing large number of messages from the process. In the existing cluster head selection method of mobile sens
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LAKSH. "BALANCED CLUSTERING APPROACH TO OPTIMIZE THE LIFETIME OF WIRELESS SENSOR NETWORKS." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/15373.

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Wireless Sensor Network is made up of a huge number of devices known as the sensor nodes. The nodes installed are confined with the battery and other resources. Energy conservation of the nodes is the prime issue in all the applications. As the overall lifetime of the network depends on the energy of these nodes, so maintaining the energy of the nodes becomes an important issue. This dissertation deals with the network which has nodes whose position is not fixed. The main concern in this work is to balance the load on the all the cluster heads. To balance the load on the CHs, every CH has bee
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KUMAR, ANIL. "SPATIAL CORRELATION MODELS ANALYSIS FOR WIRELESS SENSOR NETWORK." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14839.

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Wireless sensor networks (WSN) are deployed very densely so that accurate monitoring can be achieved in many applications. For example, the deployment density can be as high as 20 nodes/m3[1]. As sensor nodes are deployed with high density, the information observed and transmitted by sensor nodes in an area at the time an event is occurred is spatially correlated. It means there is spatial correlation in the sensors observations. The spatial correlation along with collaborative nature of the Wireless sensor networks (WSN) has potential advantages in designing energy-efficient models of Communi
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Chung, Hui-Ju, and 鍾惠如. "An Energy Conservation Communication Protocol for Wireless Sensor Networks with a Time and Space Based Cluster-Head Selection Mechanism." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/27727041597521466542.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>97<br>In recent years, wireless sensor networks widely applied in the environment monitoring. It provides a high density the time and the spatial monitor. This is for traditional monitoring ecology way. How to conserve energy effectively transmits the data the base station and the extension sensing network's network lifetime is related the research the goal. Prolonged network lifetime, scalability, and load balancing are important requirements for many sensor networks applications. Clustering sensor nodes are an effective technique for achieving these goals. Based on
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Hsieh, Pei-Jen, and 謝培仁. "An election strategy of cluster head based on the transmission rate and energy efficiency for Heterogeneous Wireless Sensor Networks." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/45513575454480578547.

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碩士<br>國立交通大學<br>資訊科學與工程研究所<br>103<br>Heterogeneous wireless sensor network contains lots of nodes with different capabilities and energy. While comparing the traditional homogeneous wireless sensor network, utilizing the heterogeneity for the network can raise the throughput. In this thesis, we propose a scheme to balance energy load on each node, control the number of cluster head to save energy, and elect the node with higher bandwidth to be a cluster head to increase the throughput. Our scheme may be applied to the emerging machine to machine communications which usually consists of a large
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CHANG, WEI-MIN, and 張偉民. "The Molecular Regulation Network between Osteoblast Differentiation Pathway and 14q32.2 microRNA Cluster and Their Roles in Head and Neck Squamous Cell Carcinoma Progression." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/aw7szp.

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博士<br>國防醫學院<br>醫學科學研究所<br>105<br>Epigenetic changes of head and neck cancer may illuminate its pathogenic roots. Through gene set enrichment analysis, we found that the oncogenic transcription factor, RUNX2, belongs to the osteoblast differentiation pathway and is widely upregulated in head and neck squamous cell carcinoma (HNSCC) with lymph node metastasis and cell proliferation. The presence of oncogenic RUNX2 also predicts poor prognosis in HNSCC patients. Enforced expression of ectopic RUNX2 promoted the cancer progression of HNSCC, whereas silencing RUNX2 impedes progression. Investigatin
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