Дисертації з теми "Directional probes"
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Gelaye, Ababu A. "UPSCALING OF A THERMAL EVOLUTION EXPERIMENT ON SHREDDED-TIRE MONOFILLS." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1512762530668535.
Повний текст джерелаO'Gorman, William Thomas. "Development of a directional flow probe for the hypersonic regime." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq29370.pdf.
Повний текст джерелаJackson, Laura Elizabeth. "The Directional p-Median Problem with Applications to Traffic Quantization and Multiprocessor Scheduling." NCSU, 2003. http://www.lib.ncsu.edu/theses/available/etd-11052003-111956/.
Повний текст джерелаJonsson, B. Lars G. "Directional Decomposition in Anisotropic Heterogeneous Media for Acoustic and Electromagnetic Fields." Doctoral thesis, Stockholm : Tekniska högsk, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3099.
Повний текст джерелаAhmad, Iftikhar [Verfasser], and Günter [Akademischer Betreuer] Schmidt. "Analysis of algorithms for online uni-directional conversion problems / Iftikhar Ahmad. Betreuer: Günter Schmidt." Saarbrücken : Saarländische Universitäts- und Landesbibliothek, 2013. http://d-nb.info/1053679491/34.
Повний текст джерелаKunemund, Rachel. "TEACHER-CHILD RELATIONSHIPS, INTERACTIONS, AND PROBLEM BEHAVIOR: A LONGITUDINAL ANALYSIS EXAMINING BI-DIRECTIONAL ASSOCIATIONS." VCU Scholars Compass, 2019. https://scholarscompass.vcu.edu/etd/5979.
Повний текст джерелаAl-Wali, Azzam Ahmad. "Explicit alternating direction methods for problems in fluid dynamics." Thesis, Loughborough University, 1994. https://dspace.lboro.ac.uk/2134/6840.
Повний текст джерелаKemin, O. "The main problems and development directions of nontraditional banking services." Thesis, Ukrainian Academy of Banking of the National Bank of Ukraine, 2009. http://essuir.sumdu.edu.ua/handle/123456789/61282.
Повний текст джерелаShao, Meiyu, A. O. Bieliatynskyi, and V. M. Pershаkov. "Existing problems and development direction of green airport in China." Thesis, National Aviation University, 2021. https://er.nau.edu.ua/handle/NAU/52916.
Повний текст джерелаMitradjieva-Daneva, Maria. "Feasible Direction Methods for Constrained Nonlinear Optimization : Suggestions for Improvements." Doctoral thesis, Linköping : Department of Mathematics, Linköping University, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8811.
Повний текст джерелаAuepanwiriyakul, Raweewan. "Inheritance Problems in Object-Oriented Database." Thesis, University of North Texas, 1989. https://digital.library.unt.edu/ark:/67531/metadc330898/.
Повний текст джерелаFAMEGA, CHRISTINE NATALIE. "DISCRETION OR DIRECTION?: AN ANALYSIS OF PATROL OFFICER DOWNTIME." University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1057691086.
Повний текст джерелаFerreira, Filho Milton Pinto. "Fast high-resolution techniques applied to the Direction of Arrival (DOA) of signals problem." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School; Available from the National Technical Information Service, 1992. http://edocs.nps.edu/npspubs/scholarly/theses/1992/Sep/92Sep_Ferreira.pdf.
Повний текст джерелаAlonso, Nicomedes III. "An alternating-direction Sinc-Galerkin method for elliptic problems on finite and infinite domains." Diss., Montana State University, 2009. http://etd.lib.montana.edu/etd/2009/alonso/AlonsoN0509.pdf.
Повний текст джерелаGretsistas, Aris. "Sparse representations & compressed sensing with application to the problem of direction-of-arrival estimation." Thesis, Queen Mary, University of London, 2013. http://qmro.qmul.ac.uk/xmlui/handle/123456789/8463.
Повний текст джерелаGu, Yan. "STUDIES ON ALTERNATING DIRECTION METHOD OF MULTIPLIERS WITH ADAPTIVE PROXIMAL TERMS FOR CONVEX OPTIMIZATION PROBLEMS." Kyoto University, 2020. http://hdl.handle.net/2433/259758.
Повний текст джерелаTsung, Chang Che. "Investigation on a change in response direction of Ga doped ZnO nanoparticles resistive sensors on exposure to NO." Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-80111.
Повний текст джерелаHögdahl, Johan. "Conditional steepest descent directions over Cartesian product sets : With application to the Frank-Wolfe method." Thesis, Linköpings universitet, Optimeringslära, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-123730.
Повний текст джерелаAleksanyan, Hayk. "Periodic homogenization of Dirichlet problem for divergence type elliptic operators." Thesis, University of Edinburgh, 2015. http://hdl.handle.net/1842/15958.
Повний текст джерелаVorlická, Adéla. "Zvýšení efektivity pracoviště pro výrobu obalů." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2009. http://www.nusl.cz/ntk/nusl-222236.
Повний текст джерелаKokten, Selen. "Bounding Procedures On Bi-directional Labeling Algorithm Of Time Dependent Vehicle Routing Problem With Time Windows In Branch-and-cut-and-price Framework." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613790/index.pdf.
Повний текст джерелаs future distribution network by a simulation study.
Chen, Zhouye. "Reconstruction of enhanced ultrasound images from compressed measurements." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30222/document.
Повний текст джерелаThe interest of compressive sampling in ultrasound imaging has been recently extensively evaluated by several research teams. Following the different application setups, it has been shown that the RF data may be reconstructed from a small number of measurements and/or using a reduced number of ultrasound pulse emissions. According to the model of compressive sampling, the resolution of reconstructed ultrasound images from compressed measurements mainly depends on three aspects: the acquisition setup, i.e. the incoherence of the sampling matrix, the image regularization, i.e. the sparsity prior, and the optimization technique. We mainly focused on the last two aspects in this thesis. Nevertheless, RF image spatial resolution, contrast and signal to noise ratio are affected by the limited bandwidth of the imaging transducer and the physical phenomenon related to Ultrasound wave propagation. To overcome these limitations, several deconvolution-based image processing techniques have been proposed to enhance the ultrasound images. In this thesis, we first propose a novel framework for Ultrasound imaging, named compressive deconvolution, to combine the compressive sampling and deconvolution. Exploiting an unified formulation of the direct acquisition model, combining random projections and 2D convolution with a spatially invariant point spread function, the benefit of this framework is the joint data volume reduction and image quality improvement. An optimization method based on the Alternating Direction Method of Multipliers is then proposed to invert the linear model, including two regularization terms expressing the sparsity of the RF images in a given basis and the generalized Gaussian statistical assumption on tissue reflectivity functions. It is improved afterwards by the method based on the Simultaneous Direction Method of Multipliers. Both algorithms are evaluated on simulated and in vivo data. With regularization techniques, a novel approach based on Alternating Minimization is finally developed to jointly estimate the tissue reflectivity function and the point spread function. A preliminary investigation is made on simulated data
Stejskalová, Sylva. "Nároky na funkci hudební režie v digitálním vícestopém nahrávacím procesu." Doctoral thesis, Akademie múzických umění v Praze.Hudební a taneční fakulta. Knihovna, 2018. http://www.nusl.cz/ntk/nusl-390785.
Повний текст джерелаWells, Diane. "Modelling problems of independent sector media : an analysis of market-production relationships with reference to independent film and video in Canada." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63882.
Повний текст джерелаHopkins, Britney Henderson Johnny. "Multiplicity of positive solutions of even-order nonhomogeneous boundary value problems." Waco, Tex. : Baylor University, 2009. http://hdl.handle.net/2104/5323.
Повний текст джерелаShain, Lindsey Marie. "Aging and the Perception of Coherent Motion." TopSCHOLAR®, 2018. https://digitalcommons.wku.edu/theses/2070.
Повний текст джерелаKyriakides, Anestis H. "The spiritual approach to the problem of "athumia" (depression) in St. John Chrysostom's letters to Olympias." Theological Research Exchange Network (TREN) Theological Research Exchange Network (TREN) Access this title online, 2006. http://www.tren.com.
Повний текст джерелаCalatroni, Luca. "New PDE models for imaging problems and applications." Thesis, University of Cambridge, 2016. https://www.repository.cam.ac.uk/handle/1810/256139.
Повний текст джерелаNárožný, Jakub. "Zefektivnění pracovních procesů ve firmě." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2011. http://www.nusl.cz/ntk/nusl-223298.
Повний текст джерелаVeselý, Jiří. "Zhodnocení projektu centralizace vybraných procesů v podniku." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2011. http://www.nusl.cz/ntk/nusl-223114.
Повний текст джерелаHarrison, Jullian. "PUSHED WITHOUT DIRECTION: Privileged Problems and the Configuration of Class and Race. How Latent Class Differences, Supported Through Racial Inequities, Maintain the Achievement Gap for Upper Class Black Students." VCU Scholars Compass, 2016. http://scholarscompass.vcu.edu/etd/4301.
Повний текст джерелаWirfält, Petter. "Exploiting Prior Information in Parametric Estimation Problems for Multi-Channel Signal Processing Applications." Doctoral thesis, KTH, Signalbehandling, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-134034.
Повний текст джерелаDenna doktorsavhandling behandlar parameterestimeringsproblem inom flerkanals-signalbehandling. Den gemensamma förutsättningen för dessa problem är att det finns information om de sökta parametrarna redan innan data analyseras; tanken är att på ett så finurligt sätt som möjligt använda denna kunskap för att förbättra skattningarna av de okända parametrarna. I en uppsats studeras kovariansmatrisskattning när det är känt att den sanna kovariansmatrisen har Kronecker- och Toeplitz-struktur. Baserat på denna kunskap utvecklar vi en metod som säkerställer att även skattningarna har denna struktur, och vi kan visa att den föreslagna skattaren har bättre prestanda än existerande metoder. Vi kan också visa att skattarens varians når Cram\'er-Rao-gränsen (CRB). Vi studerar vidare olika sorters förhandskunskap i riktningsbestämningsscenariot: först i det fall då riktningarna till ett antal av sändarna är kända. Sedan undersöker vi fallet då vi även vet något om kovariansen mellan de mottagna signalerna, nämligen att vissa (eller alla) signaler är okorrelerade. Det visar sig att just kombinationen av förkunskap om både korrelation och riktning är speciellt betydelsefull, och genom att utnyttja denna kunskap på rätt sätt kan vi skapa skattare som är mycket noggrannare än tidigare möjligt. Vi härleder även CRB för fall med denna förhandskunskap, och vi kan visa att de föreslagna skattarna är effektiva. Slutligen behandlar vi även frekvensskattning. I detta problem är data en en-dimensionell temporal sekvens som vi modellerar som en spatiell fler-kanalssignal. Fördelen med denna modelleringsstrategi är att vi kan använda liknande metoder i estimatorerna som vid sensor-signalbehandlingsproblemen. Vi utnyttjar återigen förhandskunskap om källsignalerna: i ett av bidragen är antagandet att vissa frekvenser är kända, och vi modifierar en existerande metod för att ta hänsyn till denna kunskap. Genom att tillämpa den föreslagna metoden på experimentell data visar vi metodens användbarhet. Det andra bidraget inom detta område studerar data som erhålls från exempelvis experiment inom kärnmagnetisk resonans. Vi introducerar en ny modelleringsmetod för sådan data och utvecklar en algoritm för att skatta de önskade parametrarna i denna modell. Vår algoritm är betydligt snabbare än existerande metoder, och skattningarna är tillräckligt noggranna för typiska tillämpningar.
QC 20131115
Bertka, Christopher M. "Descriptions of Floating Bodies in 2 Dimensions." Kent State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=kent159077009117022.
Повний текст джерелаScrivanti, Gabriele Luca Giovanni. "Nonsmooth Nonconvex Variational Reconstruction for Electrical Impedance Tomography." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20700/.
Повний текст джерелаHolmgren, Johan. "Efficient Updating Shortest Path Calculations for Traffic Assignment." Thesis, Linköping University, Department of Mathematics, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2573.
Повний текст джерелаTraffic planning in a modern congested society is an important and time consuming procedure. Finding fast algorithms for solving traffic problems is therefore of great interest for traffic planners allover the world.
This thesis concerns solving the fixed demand traffic assignment problem (TAP) on a number of different transportation test networks. TAP is solved using the Frank-Wolfe algorithm and the shortest path problems that arise as subproblems to the Frank-Wolfe algorithm are solved using the network simplex algorithm. We evaluate how a number of existing pricing strategies to the network simplex algorithm performs with TAP. We also construct a new efficient pricing strategy, the Bucket Pricing Strategy, inspired by the heap implementation of Dijkstra's method for shortest path problems. This pricing strategy is, together with the actual use of the network simplex algorithm, the main result of the thesis and the pricing strategy is designed to take advantage of the special structure of TAP. In addition to performing tests on the conventional Frank-Wolfe algorithm, we also test how the different pricing strategies perform on Frank-Wolfe algorithms using conjugate and bi-conjugate search directions.
These test results show that the updating shortest path calculations obtained by using the network simplex outperforms the non-updating Frank-Wolfe algorithms. Comparisons with Bar-Gera's OBA show that our implementation, especially together with the bucket pricing strategy, also outperforms this algorithm for relative gaps down to 10E-6.
Пряхін, Є. В., та Ye V. Priakhin. "Адміністративно-правове регулювання і забезпечення дотримання правил благоустрою населених пунктів в Україні: дисертація". Thesis, ЛьвДУВС, 2007. http://dspace.lvduvs.edu.ua/handle/1234567890/353.
Повний текст джерелаДисертацію присвячено комплексному дослідженню законо-давчих, теоретичних та практичних проблем діяльності, пов’язаної з благоустроєм населених пунктів. Проаналізовано основні етапи роз-витку суспільних відносин у сфері благоустрою, розкрито компе-тенції органів публічної влади у регулюванні питань благоустрою. Дано характеристику взаємодії органів з питань благоустрою. Сформульовано висновки та пропозиції, спрямовані на підвищення ефективності адміністративно-правового регулювання і забезпе-чення благоустрою населених пунктів. The dissertation deals with the complex investigation of legislative, theoretical, practical problems at the activity connected with public wel-fare of inhabited settlements. The main steps of social relations develop-ment at the public welfare sphere are analyzed, the public authority competence in planning and organization of public service is considered. The interaction characteristic of competent bodies is given. The conclusions and suggestions to raise the efficiency of administrative-legal regulation and public welfare enforcement are formulated.
Lahiani, Nouha. "Méthode hybride d'affectation des ressources humaines pour l'amélioration de la performance de la maintenance." Thesis, Paris 8, 2015. http://www.theses.fr/2015PA080037.
Повний текст джерелаIn this thesis, a decision-making tool for maintenance management process based on assignment ofhuman resources is proposed in order to improve maintenance performance. An optimal maintenanceperformance is indispensable to guarantee the productivity and competitiveness of manufacturingcompanies.The proposed approach provides a framework of different possible levers to measure, evaluate,improve and optimize the maintenance performance. The assignment of human resources problem isconsidered. It takes into account different constraints like human resources availability, competences,urgency degree management of interventions requests etc.The proposed method is based on a discrete event simulation model, providing a better presentation ofthe maintenance service and better comprehensive thanks to the performance indicators. To improveuntil optimize the model, a simulation-based Pareto optimization method is introduced. Optimizationmodule was coded on independent programs in order to provide an opportunity of control thesimulation based optimization process.The proposed simulation based optimization method find good solutions in a reasonable amount oftime. Applying this technique on an industrial case-study, we show that it is more effective indetecting real faults than existing alternatives. The approach can be extended to cover other domainsand other types of simulation models
Бабій, І. А. "Активізація економічного зростання на регіональному рівні (на прикладі Одеської області)". Thesis, Одеський національний економічний університет, 2021. http://local.lib/diploma/Babii3.pdf.
Повний текст джерелаУ роботі розглядаються теоретичні аспекти економічного розвитку, фактори його забезпечення, індикатори та державне стимулювання економічного зростання на регіональному рівні. Проаналізовано основні складові економічного потенціальну Одеської області Запропоновано пріоритетні напрямки для активізації економічного зростання в Одеській області.
The theoretical aspects of economic development, factors of its provision, indicators and state stimulation of economic growth at the regional level are considered in the work. The main components of the economic potential of Odessa region are analyzed Priority directions for intensification of economic growth in Odessa region are offered.
Villafañe, Roca Laura. "Experimental Aerothermal Performance of Turbofan Bypass Flow Heat Exchangers." Doctoral thesis, Universitat Politècnica de València, 2014. http://hdl.handle.net/10251/34774.
Повний текст джерелаVillafañe Roca, L. (2013). Experimental Aerothermal Performance of Turbofan Bypass Flow Heat Exchangers [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/34774
TESIS
Teng, Sin Yong. "Intelligent Energy-Savings and Process Improvement Strategies in Energy-Intensive Industries." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-433427.
Повний текст джерелаRamakrishnan, Vijay. "Development of an omni-directional weather-monitoring anemometer." Thesis, 2006. http://hdl.handle.net/1969.1/150920.
Повний текст джерелаWu, Mao-Cheng, and 吳茂成. "On Target Coverage Problem of Angle Rotatable Directional Sensor Networks." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/93871248409032455212.
Повний текст джерела亞洲大學
資訊工程學系碩士班
101
In this thesis, we study the target coverage problem of directed sensor networks with rotatable angles. The main purpose of this problem is to maximize number of targets to be covered while minimize number of activated directional sensors. Coverage problem is well-studied for omni-directional sensors; however, it is still a challenge task for directional sensor. The directional sensor nodes used in the previous works are composed of fixed number of sensors, and the orientations of sensors are fixed. In this study, we consider the directional sensors with arbitrary sensing orientations. Our algorithm constructs sectors of sensors based on targets within the sensing distance of sensors to gain higher coverage rate and lower ratio of active sensors. To evaluate the performance of proposed algorithm, several simulations are conducted. Experimental results show that our algorithm can contribute to increase the coverage rate of targets and decrease the ratio of activated directional sensors obviously than previous algorithms, thus gain better coverage performance and longer lifetime for directed sensor networks.
Chen, Kuan-Hua, and 陳冠樺. "Heterogeneous Directional Sensors Self-Deployment Problem in a Bounded Monitoring Area." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/83803676049073499870.
Повний текст джерела國立交通大學
電信工程研究所
99
Good deployment of sensors empowers the network with effective monitoring ability. Different from omnidirectional sensors, the coverage region of a directional sensor is determined by not only the sensing radius (distance), but also its sensing orientation and spread angle. Heterogeneous sensing distances and spread angles are likely to exist among directional sensors, to which we refer as heterogeneous directional sensors. In this thesis, we target on a bounded monitoring area and deal with heterogeneous directional sensors equipped with locomotion and rotation facilities to enable the sensors self-deployment. Our base and optimized deployment algorithms are proposed to achieve high sensing coverage ratio in the monitored field. These algorithms leverage the concept of virtual forces (for sensors movements) and virtual boundary torques (for sensors rotations). Performance results demonstrate that our optimized deployment mechanism is capable of providing desirable surveillance level, while consuming moderate moving and rotating energy.
SU, WEN-CHING, and 蘇文清. "Vehicle Routing Problem with Soft Time Window for Concurrent Bi-Directional Logistics." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/82379886639362879885.
Повний текст джерела國立中央大學
土木工程研究所
93
Abstract The introduction of reverse logistics may significantly reduce the cost of returned merchandise, improve the customer’s satisfaction, and therefore increase enterprise profit. Recently, most of enterprises pay their great attention to the inclusion of reverse logistics to proceed hand in hand with already regularly-operated forward logistics. Transportation of physical distribution plays a critical role in logistics. In general, transportation cost is the majority of the total cost in supply chain, fifty-two percent approximately. The principal objective of the study is therefore to concurrently accomplish the delivery and pickup commodities at customer’s specified time window, i.e. to perform forward and reverse logistics at the identical trip. It may be classified as a vehicle routing problem with soft time window for simultaneous commodity delivery and pickup. The traditional vehicle routing problem is mostly considered the single object, the total distance, however the operation of companies is based on multiple objects rather than a single object. Therefore this study is to integrate the shortest distance and the fewest penalty cost by the weighting method in terms of both the cost and the level of service. This study suggested that pickup during the delivery only requires the rest capacity enough for the goods. There is no such constraint that pickup only can be performed when the certain capacity of the car is left. We solved the modified Solomon benchmark with random pickup demand by using Genetic Algorithms with soft time window (The penalty is dramatically increased by increasing the time of being late and waiting to emphasize the value of time for customers). In addition, we program a computer to demonstrate the accuracy of this idea. The results showed that total cost was slightly increased by increasing the demand of pickup and the cost was increased maximally about 6.44% when the quantity of pickup was about half of that of delivery. As a result, the idea, pickup during the delivery, actually improved the efficiency of the vehicle usage and reduced the waste of the capacity of returned vehicles.
LUO, YU-SHU, and 羅玉樹. "Using Genetic Algorithms on the Target Coverage Problem in Directional Sensor Networks." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/xuzrpa.
Повний текст джерела中華大學
資訊工程學系
107
With the development of technology, the technological advancement of wireless sensing networks has made the application of wireless sensing networks more popular in the civilian Sector, such as home, medical, ecological and road traffic. However, with the wide application, after the wireless sensing network is deployed, the coverage rate will lead to the subsequent application, and the coverage of the wireless sensing network is discussed and studied by many researchers. The problems covered in the wireless sensing network can be roughly divided into two categories: (1) monitoring the area coverage problem of the region of interest, and (2) monitoring the target coverage problem of the specific target. However, on these issues, it is assumed that the sensor has omnidirectional sensing capability. In real life, considering the limitations of technology and hardware, the sensing area of the sensor will present a limited angle sensing area. It is called a directional sensor. Different from the traditional omnidirectional sensor, the sensing range of the directional sensor is a Sector-like sensing area composed of a fixed sensing radius and a limited sensing angle. In this thesis, we focus on how to use a limited number of directional sensors in a sensing range and use the mechanism of rotating the sensor angle to achieve optimal target coverage. We have proposed a genetic algorithm to solve this problem. I hope that we can refer to the rules of the biological world, "natural selection, survival of the fittest", through the evolution of iteration to get a set of best solutions with better fitness values to obtain better target coverage.
Hsu, Yin-Chung, and 徐寅鐘. "A Study on the Coverage Problem in Directional Sensor Networks with Rotatable Sensors." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/75811595617080584610.
Повний текст джерела中華大學
資訊工程學系碩士班
100
In wireless sensor networks (WSNs), many applications in military and civilian operations, such as environmental monitoring, battlefield surveillance, health care and volcanoes monitoring become more popular in recent years, since more powerful sensors with high capabilities are being designed at rapidly decreasing costs. However, the coverage of sensor deployment which is good or bad must be affect these applications, so the coverage problem in sensor network has received a lot of attention from many researchers and has been widely discussed. The overage problem can be broadly divided into two categories: target coverage problem and area coverage problem. Most of the past work on the problem is based on the assumption of omni-directional sensors that have an omni-angle of sensing range. In real-world, most sensors may have a limited angle of sensing range due to technical constraints or cost considerations. s In this thesis, we propose a Maximum Coverage with Rotatable Sensors (MCRS) problem in which coverage in terms of the number of targets to be covered is maximized whereas the rotated angles of sensors are minimized. We present two distributed greedy algorithm solutions for the MCRS problem. The second objective is to solve the area coverage problem. We proposed a greed algorithm to decrease the overlapping area and maximize the area coverage of a randomly deployed directional sensor network. Finally, simulation results show that the proposed algorithms are more effective than the previous methods of the coverage rate.
Chen, Yen-Ting, and 陳彥廷. "A Study on the Target Coverage Problem in Directional Sensor Networks with Rotatable Sensors." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/g7vz48.
Повний текст джерела中華大學
資訊工程學系碩士班
99
Recently directional sensor networks have gained attention. Target coverage problem is still an important issue in directional sensor networks. Sensor networks consist of large number of sensors that measure their environment. Unlike conventional omni-directional sensors that always have an omni-angle of sensing range; directional sensors may have a limited angle of sensing range due to technical constraints, energy constraint or cost considerations. Directional sensors can through switching direction or rotating orientation to get better coverage in an interested region. Therefore, it is possible that when directional sensor nodes are randomly scattered in the environment, some interested targets cannot be covered even if the targets are located in the sensing range of sensors. We propose a Maximum Coverage with Rotatable Angles (MCRA) problem and a Maximum Coverage with Rotatable Sensors (MCRS) problem that in two different models in which coverage in terms of the number of targets to be covered is maximized whereas the angle’s degrees to be rotated is minimized. We present two centralized greedy algorithms for MCRA problem, each two centralized and distributed greedy algorithm solutions for the MCRS problem. Simulation results are presented to apply angle adjustment algorithm to enhance the coverage of the directional sensor networks.
Chung, Cheng-Yen, and 鐘政諺. "An Improvement for the Area Coverage Problem in Directional Sensor Networks with Rotatable Sensors." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/94518273569467962625.
Повний текст джерела中華大學
資訊工程學系碩士班
102
In wireless sensor networks (WSNs), many applications in military and civilian operations, such as environmental monitoring, battlefield surveillance, health care and volcanoes monitoring become more popular in recent years, since more powerful sensors with high capabilities are being designed at rapidly decreasing costs. However, the coverage of sensor deployment which is good or bad must be affect these applications, so that the coverage problem in the sensor network has received a lot of attention of many researchers and widely discussed. The coverage problem can be broadly divided into two categories: target coverage problem and area coverage problem. Most of the past work to solve the problem is always based on the assumption of omni-directional sensors that have an omni-angle of sensing range. In real-world, most sensors may have a limited angle of sensing range due to technical constraints or cost considerations. In this thesis, we proposed a Maximum Coverage with Rotatable Sensors (MCRS) problem. We proposed a greed algorithm to use the Voronoi-based to decrease the overlapping area and maximize the area coverage of a randomly deployed directional sensor network. Finally, simulation results show that our proposed algorithms are more effective than the previous methods of the coverage rate.
He, Meng-Chia, and 何孟佳. "A Study on the Area Coverage Problem in Directional Sensor Networks with Mobile Sensors." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/07411685226092710128.
Повний текст джерела中華大學
資訊工程學系碩士班
99
A directional sensor network is composed of many directional sensor nodes. Unlike conventional omni-directional sensors that always have an omni-angle of sensing range, directional sensors may have a limited angle of sensing range due to technical constraints or cost considerations. Area coverage is still an essential issue in a directional sensor network. In this thesis, we study the area coverage problem in directional sensor networks with mobile sensors, which can move to the correct places to get high coverage. We present distributed self-deployment schemes of mobile sensors. After sensors are randomly deployed, each sensor calculates its next new location to move in order to obtain a better coverage than previous one. The locations of sensors are adjusted round by round so that the coverage is gradually improved. Based on circumcenter and incenter of sensing direction of the directional sensors, we design two schemes, namely Circumcenter-based and Incenter-based schemes respectively, to guide the moving direction. And we also proposed a virtual force scheme to increase the coverage. Simulation results show the effectiveness of our schemes in term of the coverage improvement.
Yang, Bo-kai, and 楊博凱. "An Orthogonal-direction Near-field Magnetic Probe Based on Folded-loop Structure." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/39677181935785229714.
Повний текст джерела國立臺灣大學
電信工程學研究所
99
Near-field magnetic probes are often used to measure the magnetic fields above a printed circuit board in order to identify the sources and coupling paths of an electromagnetic interference (EMI) or radio frequency interference (RFI) problem. This thesis introduced a magnetic probe structure using two folding loop to measurement magnetic fields in two orthogonal direction. This orthogonal-direction magnetic probe using differential-mode signal and common-mode signal to distinguish orthogonal magnetic fields, has better sensitivity and E-field coupling suppression than traditional orthogonal magnetic probe. The effects of this probe are analyzed using full-wave simulations and measurements.