Thematische Bibliographien / Ws1s

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Auswahl der wissenschaftlichen Literatur zum Thema „Ws1s“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 4. Februar 2022

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Zeitschriftenartikel zum Thema "Ws1s"

Fiedor, Tomáš, Lukáš Holík, Ondřej Lengál und Tomáš Vojnar. „Nested antichains for WS1S“. Acta Informatica 56, Nr. 3 (01.01.2019): 205–28. http://dx.doi.org/10.1007/s00236-018-0331-z.

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D, Khureldavaa, Odontuya G, Tsiiregzen A, Oyuntsetseg D, Daariimaa B und Amarsanaa B. „Comparative study of the chemical composition of submineral water from the central and east part of Mongolia“. Bulletin of Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences, Nr. 5 (30.11.2018): 33–40. http://dx.doi.org/10.5564/bicct.v0i5.1071.

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We conducted the study of physico-chemical characteristics as hydrochemical composition and micro-elements in submineral water samples from Khuvsgul (WS1, WS2), Arkhangai (WS3-WS5), Khentii (WS6-WS11) and Dornogovi (WS12) provinces in 2017 and 2018. The pH data of submineral water in the Central part (WS1-WS5) were determined as 7.21 to 7.65, but in the East part (WS6-WS12) were showed less acidic as 5.68 to 7.86. The elec-trical conductivity (EC) and oxidation-reduction potential (ORP) in submineral water samples were ranged from 10.1 to 56.5 mS/m and -236 to 184 mV, respectively. Specifically, ORP in samples WS1, WS8 and WS10 were -236 mV, -22 mV and -56 mV, which are indicates the reducing property of samples. The hydrogeochemical results indicate that WS1-WS4 and WS6 submineral water are belong to the HCO3-Ca-Mg type, but WS5, WS7-WS10 and WS12 are belong to the HCO3-Ca-Mg-Na type water. The WS11 submineral water is alone belonging to the HCO3-Na-Ca type. Based on the geochemical compositions, the all studied submineral water were belong to the rock dominating area which were enriched by rock-water interaction. The radioactivity concentrations of 222Rn and its decay products 214Pb and 214Bi in samples WS11 and WS12 were 241-339 Bq/l and 307-315 Bq/l, 268-371 Bq/l, respectively. Thus, such submineral water is classifying to the radon-containing mineral water. Төвийн болон зүүн бүсийн рашаан төст булгуудын химийн найрлагын харьцуулсан судалгаа Хураангуй: Энэхүү судалгаагаар Хөвсгөл (WS1, WS2), Архангай (WS3-WS5), Хэнтий (WS6-WS11), Дорноговь (WS12) аймгуудын 2017, 2018 онуудад цуглуулсан рашаант төст булгуудын усны дээжинд физик-химийн үзүүлэлт болон микроэлементүүдийн шинжилгээ хийж, химийн найрлагыг тодорхойлсон. Төвийн бүсийн рашаант төст (WS1-WS5) булгуудын ус нь саармагаас сул шүлтлэг (рН-7.21-7.65) байхад зүүн бүсийн рашаант төст (WS6-WS12) булгуудын ус нь сул хүчиллэгээс сул шүлтлэг орчинтой (5.68-7.86) байгаа ба цахилгаан дамжуулах чанар (EC) нь 10.1-56.5 mS/m, исэлдэн ангижрах потенциал (ORP) -236-184 mV байна. Эдгээрээс WS1, WS8, WS10 зэрэг рашаан төст булгийн усанд ORP нь -236 mV, -22 mV, -56 mV илэрсэн нь бусад рашаан төст булгуудаасаа ихээхэн онцлогтой бөгөөд эдгээр уснууд нь ангижрах шинж чанартай байгааг илтгэж байна. WS1-WS4, WS6 зэрэг рашаант төст булгийн ус нь HCO3-Ca-Mg-ийн төрлийн байхад WS5, WS7-10, WS12 рашаан төст булгийн уснууд нь HCO3-Ca-Mg-Na-ийн төрлийн холимог найрлагатай, харин зөвхөн WS11 рашаан төст булгийн ус нь HCO3-Na-Ca-ийн төрлийн усны ангилалд тус тус багтаж байгааг тодорхойлсон. Судалгаанд хамрагдсан рашаан төст булгуудын ус нь Гиббсийн диаграмаар чулуулаг давамгайлсан бүсэд оршиж байгаа бөгөөд эдгээр рашаан төст булгууд нь ус-чулуулгийн харилцан үйлчлэлд орж байгааг харуулж байна. WS11 болон WS12 рашаан төст булгуудын усанд цацраг идэвхит 222Rn (241-339 Бк/л) болон түүний задралын бүтээгдэхүүн болох 214Pb (307-315 Бк/л), 214Bi (268-371 Бк/л) илэрсэн нь бусад рашаан төст булгуудаас онцлог бөгөөд радонтай рашааны ангилалд хамаарагдаж байна.Түлхүүр үг: Рашаан төст булаг, микроэлемент, химийн найрлага, цацраг идэвх, радон

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KLARLUND, NILS, ANDERS MØLLER und MICHAEL I. SCHWARTZBACH. „MONA IMPLEMENTATION SECRETS“. International Journal of Foundations of Computer Science 13, Nr. 04 (August 2002): 571–86. http://dx.doi.org/10.1142/s012905410200128x.

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The MONA tool provides an implementation of automaton-based decision procedures for the logics WS1S and WS2S. It has been used for numerous applications, and it is remarkably efficient in practice, even though it faces a theoretically non-elementary worst-case complexity. The implementation has matured over a period of six years. Compared to the first naive version, the present tool is faster by several orders of magnitude. This speedup is obtained from many different contributions working on all levels of the compilation and execution of formulas. We present an overview of MONA and a selection of implementation "secrets" that have been discovered and tested over the years, including formula reductions, DAGification, guided tree automata, three-valued logic, eager minimization, BDD-based automata representations, and cache-conscious data structures. We describe these techniques and quantify their respective effects by experimenting with separate versions of the MONA tool that in turn omit each of them.

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Lee, Dongmin, Lazaros Oreopoulos, George J. Huffman, William B. Rossow und In-Sik Kang. „The Precipitation Characteristics of ISCCP Tropical Weather States“. Journal of Climate 26, Nr. 3 (01.02.2013): 772–88. http://dx.doi.org/10.1175/jcli-d-11-00718.1.

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Abstract The authors examine the daytime precipitation characteristics of the International Satellite Cloud Climatology Project (ISCCP) weather states in the extended tropics (35°S–35°N) for a 10-yr period. The main precipitation dataset used is the Tropical Rainfall Measuring Mission (TRMM) Multisatellite Precipitation Analysis operational product 3B42 dataset, but Global Precipitation Climatology Project daily data are also used for comparison. It is found that the most convectively active ISCCP weather state (WS1), despite an occurrence frequency below 10%, is the most dominant state with regard to surface precipitation, producing both the largest mean precipitation rates when present and the largest percent contribution to the total precipitation of the tropics; yet, even this weather state appears to not precipitate about half the time, although this may be to some extent an artifact of detection and spatiotemporal matching limitations of the precipitation dataset. WS1 exhibits a modest annual cycle of the domain-average precipitation rate, but notable seasonal shifts in its geographic distribution. The precipitation rates of the other weather states appear to be stronger when occurring before or after WS1. The precipitation rates of the various weather states are different between ocean and land, with WS1 producing higher daytime rates on average over ocean than land, likely because of the larger size and more persistent nature of oceanic WS1s. The results of this study, in addition to advancing the understanding of tropical hydrology, can serve as higher-order diagnostics for evaluating the realism of tropical precipitation distributions in large-scale models.

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Haider, Husnain, Rehan Sadiq und Solomon Tesfamariam. „Performance indicators for small- and medium-sized water supply systems: a review“. Environmental Reviews 22, Nr. 1 (März 2014): 1–40. http://dx.doi.org/10.1139/er-2013-0013.

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Water supply systems (WSSs) are one of the most important and expensive core public infrastructures. The primary objective of a water supply utility is to have this valuable asset operate at its maximum possible efficiency with minimum cost throughout its design period. To achieve this objective, the first step is to evaluate the existing efficiency of all the components of the WSS using suitable performance indicators (PIs). Various agencies and organizations worldwide have developed detailed performance evaluation frameworks including several indicators to comprehensively cover all the aspects (e.g., physical asset, staffing, operational, customer satisfaction, economical) of the WSSs. Most of these frameworks and indicators have been developed for large-sized WSSs. Small- and medium-sized water supply systems (SM-WSSs) have specific performance-related issues, ranging from difficulties in collecting the data required to use the available systems of PIs to lack of skilled personnel and financial resources for efficient operations. A comprehensive review of the literature has been carried out to assess the suitability of reported performance evaluation systems for SM-WSSs in terms of their simplicity (easy and simple data requirements) and comprehensiveness (i.e., all the components of a WSS). This review also evaluates the individual PI with respect to its understandability, measurability, and comparability (i.e., within and across utility comparisons). On the basis of this detailed review, a conceptual performance evaluation system for SM-WSSs, consisting of a list of PIs grouped into their respective categories, has been proposed. The proposed system provides a stepwise approach, starting the performance evaluation process with the most significant and easy to measure PIs for small-sized WSSs and moving to a relatively complex set of indicators for SM-WSS depending on the availability of resources and specific operating conditions.

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Zanfei, Ariele, Andrea Menapace, Giuseppe Roberto Pisaturo und Maurizio Righetti. „Calibration of Water Leakages and Valve Setting in a Real Water Supply System“. Environmental Sciences Proceedings 2, Nr. 1 (03.09.2020): 41. http://dx.doi.org/10.3390/environsciproc2020002041.

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Water leakages are one of the most significant uncertainties affecting water supply system (WSSs) modelling. Due to the dependence between water losses and pressure, the WSSs characterised by high values of pressure in the distribution network are strongly affected by this problem. High-pressure conditions are typical of WSSs in the mountain areas. In this study, a real WSS of the Alpine region is analysed through simultaneous calibration of water losses and pressure-reducing valves with a genetic algorithm. The demand is represented by a uniformly distributed along the network pipes scheme, dealing with the water request separately from the losses.

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Haziq, Mohammad Aslam, Abdul Rahman Mosameem, Esmatullah Muslim, Rahmatullah Dost und Nazir Ahmad Qani. „Performance Benchmarking of Water Supply Systems in Kandahar City using Data Envelopment Analysis (DEA)“. European Journal of Engineering Research and Science 4, Nr. 5 (19.05.2019): 88–97. http://dx.doi.org/10.24018/ejers.2019.4.5.1313.

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Two Water Supply Systems (WSSs) have been operating and providing drinking water services to two discrete districts, namely, Second Ayno Maina (AM-WSS), District 10, owned and managed by a private sector: AFCO Corporation, and Central Kandahar (CK-WSS), Share-Naw, District 2, owned and managed by government entity: Department of Kandahar Water Supply and Sewerage, for four and ten years respectively. Both the WSSs use groundwater as source of drinking water, and due to overpopulation and urbanization, they tend to expand their services and improve their performances, despite the fact that the primary step to do so is the performance assessment of the existing systems, lacking at the moment and needs a careful consideration. Therefore, the research study is aimed at assisting the responsible authorities of the performances being carried by their existing systems and satisfaction level of their customers against the services provided, along with their international comparisons, with similar-typed associated water supply schemes. Two sets of primary data were collected, including service-provider-driven and customer-driven, from relevant authorities and districts respectively. More specifically, for consumer-driven data collection, 66 and 75 questionnaires were distributed to the consumers of (AM-WSS) and (CK-WSS) respectively. Both the data set was classified as the input and output performance indicators (PIs), and was analyzed using SPSS, DEAP and Ms. Excel softwares, in compliance with Data Envelopment Analysis (DEA) methodology. The findings showed that (AM-WSS) had a relative technical efficiency, te of 1 (100 %), whereas CK-WSS had a te of 0.545. As a result, CK-WSS was the only System considered and recommended for amendments. Furthermore, the analysis of the findings showed that CK-WSS needed to focus on decreasing the staff size and total expenditure by 45 % to comply with optimization. The team recommends to train their personnel and reduce the number by 45 %, and additionally recommends to collect, keep and register all the necessary data of the schemes in an organized manner for future demands, plans, rehabilitation, performance, and improvements of the corresponding components of their systems.

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Kang, Hyeong-Seok, Hyunook Kim, Jaekyeong Lee, Ingyu Lee, Byoung-Youn Kwak und Hyungjoon Im. „Optimization of pumping schedule based on water demand forecasting using a combined model of autoregressive integrated moving average and exponential smoothing“. Water Supply 15, Nr. 1 (15.10.2014): 188–95. http://dx.doi.org/10.2166/ws.2014.104.

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Stable water supply to end users is the most important element in water supply systems (WSSs). The portion of energy used by the water distribution system is up to 40% of the total energy consumed by WSSs. To save energy cost for pumping systems, a number of attempts have been made. Especially, an optimization scheme for scheduling the water-pumping operation has attracted the interest of water engineers. In this paper, a binary integer program was applied to optimize pumping schedule of a WSS in Polonnaruwa, Sri Lanka based on the hourly water demands for the next day. The water demands were forecasted by a combined model consisting of an autoregressive integrated moving average (ARIMA) model and an error compensation routine based on exponential smoothing technique. The result showed that the optimization system could reduce the operation cost of the WSS by minimizing electricity for water pumping; electricity cost for pump operation could be reduced by 55%.

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Elfirdoussi, Selwa, Zahi Jarir und Mohamed Quafafou. „Ranking Web Services using Web Service Popularity Score“. International Journal of Information Technology and Web Engineering 9, Nr. 2 (April 2014): 78–89. http://dx.doi.org/10.4018/ijitwe.2014040105.

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Due to the increase of published Web Services (WSs), finding the suitable WS that satisfies the user goals among discovered WSs still needs deep investigations. Certainly, QoS requirements represent a more appropriate and decisive factor to distinguish similar WSs. A lot of research efforts in this direction have been made but are still limited due to the complexity and diversity of QoS constraints. The novelty of our approach lies in its simplicity since it is based on WS Popularity Score (WSPS). This score is computed using an algorithm based on both user's requirements and quality measures of each discovered WSs such as pertinence, age, frequency, etc. The paper reports a validation of the proposed algorithm, its implementation and evaluation trough Information Extraction (IE), in order to illustrate, and assess the convenience of our approach.

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Meng, Fanxue, Nan Mei, Jian Yan, Xiaoqing Guo, Patricia A. Richter, Tao Chen und Mamata De. „Comparative potency analysis of whole smoke solutions in the bacterial reverse mutation test“. Mutagenesis 36, Nr. 4 (16.06.2021): 321–29. http://dx.doi.org/10.1093/mutage/geab021.

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Abstract Short-term in vitro genotoxicity assays are useful tools to assess whether new and emerging tobacco products potentially have reduced toxicity. We previously demonstrated that potency ranking by benchmark dose (BMD) analysis quantitatively identifies differences among several known carcinogens and toxic chemicals representing different chemical classes found in cigarette smoke. In this study, six whole smoke solution (WSS) samples containing both the particulate and gas phases of tobacco smoke were generated from two commercial cigarette brands under different smoking-machine regimens. Sixty test cigarettes of each brand were machine-smoked according to the International Organization for Standardization (ISO) puffing protocol. In addition, either 60 or 20 test cigarettes of each brand were machine-smoked with the Canadian Intense (CI) puffing protocol. All six WSSs were evaluated in the bacterial reverse mutation (Ames) test using Salmonella typhimurium strains, in the presence or absence of S9 metabolic activation. The resulting S9-mediated mutagenic concentration–responses for the four WSSs from 60 cigarettes were then compared using BMD modelling analysis and the mutagenic potency expressed as number of revertants per μl of the WSS. The quantitative approaches resulted in a similar rank order of mutagenic potency for the Ames test in both TA98 and TA100. Under the conditions of this study, these results indicate that quantitative analysis of the Ames test data can discriminate between the mutagenic potencies of WSSs on the basis of smoking-machine regimen (ISO vs. CI), and cigarette product (differences in smoke chemistry).

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Dissertationen zum Thema "Ws1s"

Ali, Mahmood, und Kumar Ravula Sai. „Real-Time Support and Energy Efficiency In Wireless Sensor Networks“. Thesis, Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-1150.

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Wireless sensors nodes are made up of small electronic devices which are capable of sensing, computing and transmitting data from harsh physical environments like a surveillance field. These sensor nodes majorly depend on batteries for energy, which get depleted at a faster rate because of the computation and communication operations they have to perform. Communication protocols can be designed to make efficient utilization of energy resources of a sensor node and to obtain real time functionality. A set of previously reported routing and MAC (Medium Access Control) layer protocols has abilities to achieve energy efficiency and supports real-time functionality. A detailed study of these protocols has been carried out and comparison tables give an overview of the protocol’s performance on some factors like latency, scalability and energy awareness. Conclusions have been drawn using the comparison table parameters of how the protocol performs when utilized for a surveillance application and what kind of tradeoff they show.

The conclusions and tabular information drawn here are from our theoretical analysis of protocols referred from journals; there is no simulation work done in this thesis.

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Doddapaneni, Krishna. „Energy aware performance evaluation of WSNs“. Thesis, Middlesex University, 2014. http://eprints.mdx.ac.uk/17460/.

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Distributed sensor networks have been discussed for more than 30 years, but the vision of Wireless Sensor Networks (WSNs) has been brought into reality only by the rapid advancements in the areas of sensor design, information technologies, and wireless networks that have paved the way for the proliferation of WSNs. The unique characteristics of sensor networks introduce new challenges, amongst which prolonging the sensor lifetime is the most important. Energy-efficient solutions are required for each aspect of WSN design to deliver the potential advantages of the WSN phenomenon, hence in both existing and future solutions for WSNs, energy efficiency is a grand challenge. The main contribution of this thesis is to present an approach considering the collaborative nature of WSNs and its correlation characteristics, providing a tool which considers issues from physical to application layer together as entities to enable the framework which facilitates the performance evaluation of WSNs. The simulation approach considered provides a clear separation of concerns amongst software architecture of the applications, the hardware configuration and the WSN deployment unlike the existing tools for evaluation. The reuse of models across projects and organizations is also promoted while realistic WSN lifetime estimations and performance evaluations are possible in attempts of improving performance and maximizing the lifetime of the network. In this study, simulations are carried out with careful assumptions for various layers taking into account the real time characteristics of WSN. The sensitivity of WSN systems are mainly due to their fragile nature when energy consumption is considered. The case studies presented demonstrate the importance of various parameters considered in this study. Simulation-based studies are presented, taking into account the realistic settings from each layer of the protocol stack. Physical environment is considered as well. The performance of the layered protocol stack in realistic settings reveals several important interactions between different layers. These interactions are especially important for the design of WSNs in terms of maximizing the lifetime of the network.

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Peng, Bo. „Energy-efficient geographic routing in realistic WSNs“. Thesis, University of Leeds, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.522967.

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Toussi, Ahora Mehdi. „Energy and QoS aware routing for WSNs“. Thesis, Kingston University, 2017. http://eprints.kingston.ac.uk/41130/.

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The advancement of Wireless Sensor Networks (WSNs), necessitate optimisation of their algorithms and their performance. More specifically, network coverage and preservation of nodes energy to increase the network's lifetime are among the core objectives of routing and clustering methods. This thesis constitutes of a literature review of WSNs' routing protocols in a categorised manner followed by proposing an energy efficient and QoS aware paradigm (PUSH) for flat network that outperform other similar paradigms in terms of collective delay and energy dissipation within the network. We have proposed a new clustering model, known as Energy Aware and Address Free Clustering (EAAFC) in which, no global addressing is required. In other words, nodes are assigned with an ID, based on local information. EAAFC clusters nodes with minimum number of cluster heads which in turn results in less in network energy consumption. Cluster heads are then re-elected frequently based on nodes' energy and distribution. EAAFC does not require geographical location of nodes nor time synchronisation. We compare performance results of our proposed clustering model, against two of well received algorithms, namely LEACH and EECF to demonstrate the advantages of EAAFC. In chapters 1 and 2, the major routing protocols have been studied over the years of research and strength and weaknesses of each protocol has been scrutinised. Further, objectives, motivation and methodology of the research are discussed. In chapter 3 and 4 the proposed routing paradigm for flat networks (PUSH) as well as the clustering protocol, EAAFC, and its advantages over other protocols is discussed in depth. Several scenarios based on similar well-known routing protocols have been implemented and tested to use as comparison and to evaluate the performance of paradigm and protocol presented in this thesis. These scenarios have been implemented in the simulator environment. The simulation results confirm the theoretic evaluation and support that PUSH and EAAFC outperforms the other protocols in compared criteria as they can achieve less latency, better coverage, preserve more energy and achieve more equally distributed energy dissipation across the network which result in longer network life time and full functionality.

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Fiedor, Tomáš. „A Decision Procedure for the WSkS Logic“. Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2014. http://www.nusl.cz/ntk/nusl-236065.

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Různé typy logik se často používají jako prostředky pro formální specifikaci systémů. Slabá monadická logika druhého řádu s k následníky (WSkS) je jednou z nich a byť má poměrně velkou vyjadřovací sílu, stále je rozhodnutelná. Ačkoliv složitost testování splnitelnosti WSkS formule není ani ve třídě ELEMENTARY, tak existují přístupy založené na deterministických automatech, implementované např. v nástroji MONA, které efektně řeší omezenou třídu praktických příkladů, nicméně nefungují pro jiné. Tato práce rozšiřuje třídu prakticky řešitelných příkladů, a to tak, že využívá nedávno vyvinutých technik pro efektní manipulaci s nedeterministickými automaty (jako je například testování universality jazyka pomocí přístupu založeného na antichainech) a navrhuje novou rozhodovací proceduru pro WSkS využívající právě nedeterministické automaty. Procedura je implementována a ve srovnání s nástrojem MONA dosahuje v některých případech řádově lepších výsledků.

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Kamsuvan, Thanisara. „Power management in Wireless Sensor Networks (WSNs)“. Thesis, Brunel University, 2016. http://bura.brunel.ac.uk/handle/2438/13499.

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The wireless sensor network (WSN) is increasingly used in many areas nowadays. It can be applied to provide the solutions to environmental problems, help increasing security and safety systems, and make the detection of the problems more efficient, e.g. the earthquake or tidal wave, which will harmful to humans. The WNS is durable and resistant to all types of terrain and climate, but while the WSN system is more and more widespread, one of the obstacles hindering the growth of this technology and the demand for WSN applications is the limited battery lifespan. Consequently, there is a significant requirement for techniques for prolonging the battery’s lifespan. Therefore, one potential solution is to use alternative energy sources combined with the sensor nodes in WSN, specifically energy harvesting from existing environmental sources. This research project reviews the characteristics of each kind of energy harvesting, understanding the various energy sources (solar energy, vibration energy and wind power), including wireless power transfer (WPT) by using electromagnetic (EM) radiation energy transfer or RF radio-frequency emission and magnetic coupled energy transfer. They are adopted for extending node’s life in the WSN, based on published information. Then it compares these diverse alternative energy methods and identifies for the most suitable energy harvesting method for application to wireless sensor nodes in order to prolong the lifespan of the battery. The major findings from the researcher include that wireless power transfer energy harvesting (WPT) using the magnetic field is the most appropriate tool for extending the lifespan of the WSN system. In addition, the author also designed an experiment to test this alternative energy, achieving by modelling the wireless power transfer with four coils. From the experimental results, it can be seen that the WPT technique using energy harvesting with magnetic inductive source can be applied to prolong the lifespan of the WSN system.

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Drira, Wassim. „Secure collection and data management system for WSNs“. Phd thesis, Institut National des Télécommunications, 2012. http://tel.archives-ouvertes.fr/tel-00814664.

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Nowadays, each user or organization is already connected to a large number of sensor nodes which generate a substantial amount of data, making their management not an obvious issue. In addition, these data can be confidential. For these reasons, developing a secure system managing the data from heterogeneous sensor nodes is a real need. In the first part, we developed a composite-based middleware for wireless sensor networks to communicate with the physical sensors for storing, processing, indexing, analyzing and generating alerts on those sensors data. Each composite is connected to a physical node or used to aggregate data from different composites. Each physical node communicating with the middleware is setup as a composite. The middleware has been used in the context of the European project Mobesens in order to manage data from a sensor network for monitoring water quality. In the second part of the thesis, we proposed a new hybrid authentication and key establishment scheme between senor nodes (SN), gateways (MN) and the middleware (SS). It is based on two protocols. The first protocol intent is the mutual authentication between SS and MN, on providing an asymmetric pair of keys for MN, and on establishing a pairwise key between them. The second protocol aims at authenticating them, and establishing a group key and pairwise keys between SN and the two others. The middleware has been generalized in the third part in order to provide a private space for multi-organization or -user to manage his sensors data using cloud computing. Next, we expanded the composite with gadgets to share securely sensor data in order to provide a secure social sensor network

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Rukpakavong, Wilawan. „Energy-efficient and lifetime aware routing in WSNs“. Thesis, Loughborough University, 2014. https://dspace.lboro.ac.uk/2134/14497.

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Network lifetime is an important performance metric in Wireless Sensor Networks (WSNs). Transmission Power Control (TPC) is a well-established method to minimise energy consumption in transmission in order to extend node lifetime and, consequently, lead to solutions that help extend network lifetime. The accurate lifetime estimation of sensor nodes is useful for routing to make more energy-efficient decisions and prolong lifetime. This research proposes an Energy-Efficient TPC (EETPC) mechanism using the measured Received Signal Strength (RSS) to calculate the ideal transmission power. This includes the investigation of the impact factors on RSS, such as distance, height above ground, multipath environment, the capability of node, noise and interference, and temperature. Furthermore, a Dynamic Node Lifetime Estimation (DNLE) technique for WSNs is also presented, including the impact factors on node lifetime, such as battery type, model, brand, self-discharge, discharge rate, age, charge cycles, and temperature. In addition, an Energy-Efficient and Lifetime Aware Routing (EELAR) algorithm is designed and developed for prolonging network lifetime in multihop WSNs. The proposed routing algorithm includes transmission power and lifetime metrics for path selection in addition to the Expected Transmission Count (ETX) metric. Both simulation and real hardware testbed experiments are used to verify the effectiveness of the proposed schemes. The simulation experiments run on the AVRORA simulator for two hardware platforms: Mica2 and MicaZ. The testbed experiments run on two real hardware platforms: the N740 NanoSensor and Mica2. The corresponding implementations are on two operating systems: Contiki and TinyOS. The proposed TPC mechanism covers those investigated factors and gives an overall performance better than the existing techniques, i.e. it gives lower packet loss and power consumption rates, while delays do not significantly increase. It can be applied for single-hop with multihoming and multihop networks. Using the DNLE technique, node lifetime can be predicted more accurately, which can be applied for both static and dynamic loads. EELAR gives the best performance on packet loss rate, average node lifetime and network lifetime compared to the other algorithms and no significant difference is found between each algorithm with the packet delay.

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Maheshwari, Hemat Kumar. „Optimizing range aware localization in wireless sensor networks (WSNs)“. Thesis, University of Leeds, 2011. http://etheses.whiterose.ac.uk/1743/.

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The adoption of wireless sensor networks (WSNs) in numerous emerging applications have prevailed us to realize that smart living is no longer an imagination, it already exists. In emerging applications, localization is an essential function so that all the sensed information can be responded carefully. Among the range free and range aware localization, range aware localization has been the most promising for fine-grained accuracy. Range aware localization has two phases, ranging and localization. Location errors always exist no matter which ranging or localization technique is used. Therefore, there is a need to optimize range aware localization for better performance. Firstly, this thesis investigates the performance of time-of-flight (ToF) and received signal strength (RSS) based ranging using IEEE 802.1.5.4 compliant WSNs nodes in outdoor and indoor for both line-of-sight (LOS) and non-line-of-sight (NLOS) paths. The fundamental Cram´er- Rao lower bound (CRLB) on ToF and RSS ranging performance is compared with the performance limits of IEEE 802.1.5.4 compliant modules. The experimental results for both outdoor and indoor LOS path demonstrated that RSS is a good candidate for range estimation at ranges less than 7m. Further analysis over long range demonstrates that ToF is a good candidate for range estimation at greater than 7m. In addition to the ranging error, another well-known error mechanism is the poor geometric anchors placement, which can significantly degrade localization performance. In the Global Positioning System (GPS) community, geometric dilution of precision (GDOP) is a well-known problem which illustrates the geometric configuration impacting localization accuracy. To analyse the impact of anchor placement on localization, performance of three lateration based approaches is compared in a cooperative fashion. Through results, It is confirmed that lateration based approaches presents a trade-off for complex computation, thus energy consumption and accuracy. It provided the needed motivation to investigate and optimize the anchor placement for better localization accuracy. The impact of anchor placement for quality reliable localization has been limited to 3-4 anchors with respect to a single subject node for 2-D. Therefore, to model reality most clearly, it makes sense to step beyond the easy and secure reach of unrealistic and mostly researched 2-dimensional representations to the pragmatic world in 3-dimensional visualization. In addition, previous work for optimal anchors placement has been limited to only additive noise. To the best of our knowledge, there is no study of optimization of anchor placement with respect to the multiplicative noise. Therefore, the optimal anchor placements are determined for both signal models based on minimum mean CRLB (m-CRLB). It is confirmed that optimal anchor placement for both signal models is different and have a serious impact on localization accuracy. The optimal anchor placement is further verified by developing a new Range Aware Localization System (RALS) using IEEE 802.15.4 compliant devices. In LOS, quality reliable localization performance can be achieved but as propagation criteria change from LOS to NLOS, localization performance also changes. In an indoor environment, localization performance degrades significantly due to multipath components. To overcome, a new 3-D scheme named Range Estimate Threshold (RET) is proposed which exploits field dimensions based on the signal model and optimal anchor placement to define a threshold. Based on the defined threshold, RET mitigates the poor range estimates from Measured Estimation (ME) for better localization accuracy. The ramification of RET on ME is explored through additive, multiplicative and log-normal shadowing models. It is confirmed that localization based on RET compared to ME showed improved accuracy.

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Khemapech, Ittipong. „PoRAP : an energy aware protocol for cyclic monitoring WSNs“. Thesis, University of St Andrews, 2011. http://hdl.handle.net/10023/1899.

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This work starts from the proposition that it is beneficial to conserve communication energy in Wireless Sensor Networks (WSNs). For WSNs there is an added incentive for energy-efficient communication. The power supply of a sensor is often finite and small. Replenishing the power may be impractical and is likely to be costly. Wireless Sensor Networks are an important area of research. Data about the physical environment may be collected from hostile or friendly environments. Data is then transmitted to a destination without the need for communication cables. There are power and resource constraints upon WSNs, in addition WSN networks are often application specific. Different applications will often have different requirements. Further, WSNs are a shared medium system. The features of the MAC (Medium Access Control) protocol together with the application behaviour shape the communication states of the node. As each of these states have different power requirements the MAC protocol impacts upon the operation and power consumption efficiency. This work focuses on the development of an energy conservation protocol for WSNs where direct communication between sources and a base station is feasible. Whilst the multi-hop approach has been regarded as the underlying communication paradigm in WSNs, there are some scenarios where direct communication is applicable and a significant amount of communication energy can be saved. The Power & Reliability Aware Protocol has been developed. Its main objectives are to provide efficient data communication by means of energy conservation without sacrificing required reliability. This has been achieved by using direct communication, adaptive power adaptation and intelligent scheduling. The results of simulations illustrate the significance of communication energy and adaptive transmission. The relationship between Received Signal Strength Indicator (RSSI) and Packet Reception Rate (PRR) metrics is established and used to identify when power adaptation is required. The experimental results demonstrate an optimal region where lower power can be used without further reduction in the PRR. Communication delays depend upon the packet size whilst two-way propagation delay is very small. Accurate scheduling is achieved through monitoring the clock drift. A set of experiments were carried out to study benefits of direct vs. multi-hop communication. Significant transmitting current can be conserved if the direct communication is used. PoRAP is compared to Sensor-MAC (S-MAC), Berkeley-MAC (B-MAC) and Carrier Sense Multiple Access (CSMA). Parameter settings used in the Great Duck Island (GDI) a production habitat monitoring WSNs were applied. PoRAP consumes the least amount of energy.

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Bücher zum Thema "Ws1s"

Kluger, Yoram, Federico Coccolini, Fausto Catena und Luca Ansaloni, Hrsg. WSES Handbook of Mass Casualties Incidents Management. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-319-92345-1.

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Sharma, Sudhir Kumar, Bharat Bhushan, Raghvendra Kumar, Aditya Khamparia und Narayan C. Debnath, Hrsg. Integration of WSNs into Internet of Things. First edition. | Boca Raton, FL : CRC Press, 2021. |: CRC Press, 2021. http://dx.doi.org/10.1201/9781003107521.

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Expert WSS 3.0 and MOSS 2007 programming. Indianapolis, IN: Wiley, 2009.

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Matthews, Joseph R. Service providers: ASPs, ISPs, MSPs, and WSPs : a Wiley tech brief. New York: John Wiley & Sons, 2002.

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Olubamise, Bankole. WSIS and rest of us: Resources for participating in the emerging world information society. Lagos, Nigeria: Development Information Network, 2006.

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WSS'97 (3rd Santa Barbara, Calif.). Self-stabilizing systems: 3rd Workshop, WSS'97, Santa Barbara, California, August 1997 : proceedings. Ottawa: Carleton University Press, 1997.

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Kleinwächter, Wolfgang. Macht und Geld im Cyberspace: Wie der Weltgipfel zur Informationsgesellschaft (WSIS) die Weichen für die Zukunft stellt. Hannover: Heise, 2004.

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World, Summit on the Knowledge Society (1st 2008 Athens Greece). Emerging technologies and information systems for the knowledge society: First World Summit on the Knowledge Society, WSKS 2008, Athens, Greece, September 24-26, 2008 : proceedings. Berlin: Springer, 2008.

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1973-, Lytras Miltiadis D., Hrsg. Emerging technologies and information systems for the knowledge society: First World Summit on the Knowledge Society, WSKS 2008, Athens, Greece, September 24-26, 2008 : proceedings. Berlin: Springer, 2008.

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Buchteile zum Thema "Ws1s"

Owre, Sam, und Harald Rueß. „Integrating WS1S with PVS“. In Computer Aided Verification, 548–51. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/10722167_42.

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Fiedor, Tomáš, Lukáš Holík, Ondřej Lengál und Tomáš Vojnar. „Nested Antichains for WS1S“. In Tools and Algorithms for the Construction and Analysis of Systems, 658–74. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-46681-0_59.

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Elgaard, Jacob, Nils Klarlund und Anders Møller. „MONA 1.x: New techniques for WS1S and WS2S“. In Computer Aided Verification, 516–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/bfb0028773.

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Fiedor, Tomáš, Lukáš Holík, Petr Janků, Ondřej Lengál und Tomáš Vojnar. „Lazy Automata Techniques for WS1S“. In Tools and Algorithms for the Construction and Analysis of Systems, 407–25. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54577-5_24.

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Glenn, James, und William Gasarch. „Implementing WS1S via finite automata“. In Lecture Notes in Computer Science, 50–63. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/3-540-63174-7_5.

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Glenn, James, und William Gasarch. „Implementing WS1S via finite automata: Performance issues“. In Lecture Notes in Computer Science, 75–86. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/bfb0031382.

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Baukus, Kai, Saddek Bensalem, Yassine Lakhnech und Karsten Stahl. „Abstracting WS1S Systems to Verify Parameterized Networks“. In Tools and Algorithms for the Construction and Analysis of Systems, 188–203. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/3-540-46419-0_14.

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Klaedtke, Felix. „Decision Procedure for an Extension of WS1S“. In Computer Science Logic, 384–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/3-540-44802-0_27.

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Fahmy, Hossam Mahmoud Ahmad. „WSNs Applications“. In Signals and Communication Technology, 69–213. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-0412-4_3.

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Fahmy, Hossam Mahmoud Ahmad. „WSNs Manufacturers“. In Signals and Communication Technology, 495–509. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-0412-4_7.

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Konferenzberichte zum Thema "Ws1s"

Himeno, M., S. Noda, R. Himeno und K. Fukasaku. „Application of Genetic Algorithm to Prediction of Artery Geometry“. In ASME/JSME 2007 5th Joint Fluids Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/fedsm2007-37241.

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We used the genetic algorithm (GA) and two-dimensional blood flow analysis to examine the fluid dynamic and engineering factors in multi-objective optimization of blood tubes (vessels). We supposed two factors from fluid dynamics: the wall shear stress (WSS) and the pressure loss, and one materials saving factor: the artery length. As a result, we could get the optimum shapes for each factor. In the case of WSS and artery length, both smoothly curved artery shapes and shapes with bulges were obtained as lower WSS cases. The shapes with bulges were similar to those of aneurysms. In this case, it was found that the WSS increases after the bulge is removed. This means bulges in artery vessel areas with higher WSSs effectively reduce the WSS value. Only the case of WSS and artery length produced a shape like an aneurysm. These results indicate that WSS and artery length are significant factors in determining artery shape.

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Molony, David S., Andrew Nencka, Zhixin Li, Ming Zhao und Don P. Giddens. „Hemodynamics of the Rat Aortic Arch“. In ASME 2012 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/sbc2012-80371.

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Hemodynamics have been linked to the genesis and progress of vascular disease in humans and animals1. Disturbed flow patterns such as stagnant flow or flow reversal lead to low or oscillating wall shear stress (WSS). Several in-vivo studies have correlated these types of WSS with disease formation1, 2. The desire to find correlations between markers of vascular disease and mechanical stimuli and because of their easier availability has led to an increasing number of animal model studies. The mouse, in particular, is a commonly used animal for investigating vascular disease formation and progression. Suo et al., were one of the first to relate findings on the molecular level with WSS1. They found increased VCAM and ICAM expression in areas of low WSS. More recently Hoi et al.2, have shown a correlation between atherosclerotic plaque development and hemodynamic parameters such as low time averaged wall shear stress (TAWSS) and Oscillatory Shear Index (OSI).

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Kawahara, Hiroki, Akio Sahara, Yoshiaki Sone, Shingo Kawai, Mitsunori Fukutoki, Yutaka Miyamoto, Keita Yamaguchi, Kenya Suzuki und Toshikazu Hashimoto. „First investigation and reduction of inter-WSS crosstalk in multiple-arrayed WSSs for large-scale optical node“. In 2017 Opto-Electronics and Communications Conference (OECC) and Photonics Global Conference (PGC). IEEE, 2017. http://dx.doi.org/10.1109/oecc.2017.8114997.

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„WSNS Organization“. In 2011 IEEE 8th International Conference on Mobile Ad-Hoc and Sensor Systems (MASS). IEEE, 2011. http://dx.doi.org/10.1109/mass.2011.148.

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Armando, Alessandro, und Hilarie Orman. „Preface - WSCS 2012“. In 2012 IEEE Security and Privacy Workshops (SPW). IEEE, 2012. http://dx.doi.org/10.1109/spw.2012.9.

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Chou, Yu-Cheng. „A Hybrid Energy-Efficient Itinerary Planning for Mobile Agents in Wireless Sensor Networks“. In ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/detc2013-12920.

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Wireless sensor networks (WSNs) are limited to resources including computing power, storage capacity, and especially energy supply. Thus, energy consumption of sensor nodes has become a dominant performance index for a WSN. In addition, data transmission between sensor nodes is a main energy consumer of WSNs. This paper presents a method called immune genetic algorithm based multiple-mobile-agent itinerary planning (IGA-M2IP) that addresses issues of energy consumption in large-scale WSNs. The IGA-M2IP preserves a GA’s advantages, and further improves a GA’s efficiency by restraining possible degenerative phenomena during the evolutionary process.

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„Title Page i“. In IEEE International Workshop on Semantic Computing and Systems. IEEE, 2008. http://dx.doi.org/10.1109/wscs.2008.1.

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Lee, Myung-Eun, Wan-Hyun Cho, Sun-Worl Kim, Soo-Hyung Kim und Xin Zhao. „Intensity-Based Registration of Medical Images Using Penalized Maximum Likelihood“. In 2008 IEEE International Workshop on Semantic Computing and Systems (WSCS). IEEE, 2008. http://dx.doi.org/10.1109/wscs.2008.10.

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Li, Kangshun, Lanlan Kang, Wensheng Zhang und Bing Li. „Comparative Analysis of Genetic Algorithm and Ant Colony Algorithm on Solving Traveling Salesman Problem“. In 2008 IEEE International Workshop on Semantic Computing and Systems (WSCS). IEEE, 2008. http://dx.doi.org/10.1109/wscs.2008.11.

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Yang, Hua, Yanxiang He, Donghong Ji und Dexi Liu. „A Research on Connectivity of Undirected Basic Element Complex Network of Topic-Related Documents“. In 2008 IEEE International Workshop on Semantic Computing and Systems (WSCS 2008). IEEE, 2008. http://dx.doi.org/10.1109/wscs.2008.12.

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