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Assessing the Energy Efficiency of Localization in Wireless Sensor Networks

Assessing the Energy Efficiency of Localization in Wireless ...

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Consumer Communications and Networking Conference, CCNC IEEE

作者： Dominik Lieckfeldt Jiaxi You Ralf Behnke Jakob Salzmann Dirk Timmermann Institute of Applied Microelectronics and Computer Engineering University of Rostock Rostock Germany

We propose a measure to characterize the energy efficiency of algorithms for localization in wireless networks. The measure presented differs from previous approaches in that it is bounded and supports objective comparison. Furthermore, it corresponds to the general understanding that a high value should indicate high efficiency. Simulation results for localization using maximum likelihood estimation (MLE), for least squares estimation (LS) and for multidimensional scaling (MDS) are briefly discussed.

关键词： Energy efficiency Wireless sensor networks Sensor phenomena and characterization Energy measurement Maximum likelihood estimation Wireless communication Energy consumption Signal processing algorithms microelectronics computer networks

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GAF&Co: Connectivity aware topology management for sensor networks

GAF&Co: Connectivity aware topology management for sensor ne...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Jiaxi You Dominik Lieckfeldt Jakob Salzmann Dirk Timmermann Institute of Applied Microelectronics and Computer Engineering University of Rostock Germany

In order to achieve energy conservation in WSNs, most topology management protocols use a subset of sensor nodes for global routing. Using fewer nodes results in a reduced connectivity of the network, which eventually increases the number of routing holes. Holes in networks often cause failures in message routing due to the local minimum problem. Therefore, traditional geographic routing protocols cannot be applied with such topology management protocols. In this paper, we propose a novel topology management protocol derived from the Geographical Adaptive Fidelity (GAF) protocol, called GAF with COnnectivity-awareness (GAF&Co). Instead of using virtual grids in GAF, our approach employs hierarchical hexagonal cells to avoid local minimums in WSNs. The purpose is to schedule redundant nodes into energy-saving mode, while maintaining the connectivity of a network for simple geographic routing protocols. Comparing to GAF, the number of cells as well as the overall energy consumption of a WSN also drops dramatically with the proposed protocol.

关键词： Network topology Routing protocols Wireless sensor networks computer network management Energy management engineering management Energy conservation microelectronics computer networks Power engineering and energy

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Exploiting Malicious Node Detection for Lifetime Extension of Sensor Networks

Exploiting Malicious Node Detection for Lifetime Extension o...

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Consumer Communications and Networking Conference, CCNC IEEE

作者： R. Behnke J. Salzmann D. Lieckfeldt K. Thurow F. Golatowski D. Timmermann Institute of Applied Microelectronics and Computer Engineering University of Rostock Germany

Wireless Sensor Networks (WSN) have attracted considerable research effort in the community during the past couple of years. One of the most challenging issues so far is the extension of network lifetime with regards to small battery capacity and self-sustained operation. Endeavors to save energy have been made on various frontiers, ranging from hardware improvements over medium access and routing protocols to network clustering and role changing strategies. In addition some authors studied failures in communication regarded as error detection. Yet, only weak attention has been paid to the detection of malicious nodes and its potential for lifetime extension. In this work, we present a short overview of detection and classification of malicious nodes in WSN and describe its potential in terms of network lifetime and reliability.

关键词： Wireless sensor networks Routing protocols Chemical sensors Access protocols Fault detection Costs Fault diagnosis Batteries Hardware Knowledge management

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Devices Profile for Web Services in Wireless Sensor Networks: Adaptations and enhancements

Devices Profile for Web Services in Wireless Sensor Networks...

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： Guido Moritz Elmar Zeeb Steffen Prüter Frank Golatowski Dirk Timmermann Regina Stoll Institute of Applied Microelectronics and Computer Engineering University of Rostock Rostock Germany Institute of Preventive Medicine University of Rostock Rostock Germany

ISBN: (纸本)9781424427277

For Service-oriented Architectures, Web Services are claimed as state of the art to connect business execution layers as well as networking devices. Additionally, the deployment of Wireless Sensor Networks became applicable over the last years. The usage of application layer gateways and proxy concepts allow the integration of these sensor networks into real world scenarios and existing networks that make use of Web Services. This paper presents a new approach to adapt and enhance the Devices Profile for Web Services to be applied in Wireless Sensor Networks directly. Thus, seamless connectivity between business layers, device level networks, and Wireless Sensor Networks are possible.

关键词： Web services Wireless sensor networks Sensor phenomena and characterization Probes Service oriented architecture Hardware computer network reliability Energy consumption Design engineering Application software

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FPGA-based implementation alternatives for keyed-hash message authentication code in networked embedded systems

FPGA-based implementation alternatives for keyed-hash messag...

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： Enrico Heinrich Marian Lüder Ralf Joost Ralf Salomon Faculty of Computer Science and Electrical Engineering Institute of Applied Microelectronics and Computer Engineering University of Rostock Germany

ISBN: (纸本)9781424427277

Field-programmable gate arrays provide a very flexible implementation platform that supports the development of tamper-proof networked embedded systems. In order to achieve a secure mode of operation, many of these systems employ keyed-hash message authentication code, to provide security against intentional tampering. Since this algorithm is of high computational complexity, this paper utilizes various hardware-software co-design techniques for its implementation, and compares the results to standard software. The considered techniques vary in the degree of required design expertise and of how (software) functionalities are implemented in hardware logic.

关键词： Message authentication Embedded system Hardware Security Field programmable gate arrays Cryptography Logic design Real time systems Protection computer science

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Platform and language independent service life cycle management for device centric SOAs

Platform and language independent service life cycle managem...

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IEEE International Conference on Industrial Informatics (INDIN)

作者： Christian Fabian Elmar Zeeb Dirk Timmermann Frank Golatowski Institute of Applied Microelectronics and Computer Engineering University of Rostock Rostock Germany Center for Life Science and Automation Rostock Germany

Service-oriented architectures (SOA) are nowadays a wide-spread software building approach. The fields of application ranges from embedded devices up to enterprise and business solutions. For distributed services and devices it makes sense to have a mechanism for remote administration to manage their life cycle. Technological standards like OSGi (see section 3) provide such a life cycle management, but device-oriented Web service technologies like the devices profile for Web services (DPWS) do not specifies such a mechanism as a standard. In this paper we present a service-based life cycle manager for an implementation of DPWS to manage the services of a device during runtime through remote reconfiguration. The advantage of the presented solution is the ability to be platform and language independent by using a script-based interaction between the life- cycle-manager and the individual services.

关键词： Web services Service oriented architecture Runtime Protocols Java Gravity computer architecture Application software Software architecture Home automation

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Generic sensor network gateway architecture for plug and play data management in smart laboratory environments

Generic sensor network gateway architecture for plug and pla...

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： Elmar Zeeb Ralf Behnke Christian Hess Dirk Timmermann Frank Golatowski Kerstin Thurow Institute of Applied Microelectronics and Computer Engineering University of Rostock Rostock Germany Center for Life Science and Automation Rostock Germany

ISBN: (纸本)9781424427277

During the last years, recent technological advances enabled the development of tiny devices equipped with radio, micro controller and sensors, called sensor nodes. Collaborating networks of such devices, known as wireless sensor networks (WSNs), are subject of many researches. A couple of network centric tasks like data transmission and aggregation, self-organisation, localization and energy awareness have been focused in various publications. Researches, e.g. IPv6 over low power WPAN (6LoWPAN), are going to standardize the connection of sensor nodes with common Internet protocols. Nevertheless, until now proprietary techniques are used within most networks, especially for the coupling towards the outside world as well as the data management. Depending on WSN hardware and software, the gateway software as well as storage and presentation of data differs for most sensor networks. In this work we present an infrastructure which bases upon a generic gateway. Standardized dataset will be stored by this device using sensor Web enablement (SWE) and standard protocols. By use of devices profile for Web services (DPWS) plug and play abilities as well as a comfortable query interface for presentation is realized.

关键词： Intelligent sensors Plugs Environmental management Wireless sensor networks Couplings Protocols Radio control Collaboration Data communication Internet

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Strategies to overcome border area effects of coarse grained localization

Strategies to overcome border area effects of coarse grained...

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Workshop on Positioning, Navigation and Communication, WPNC

作者： Ralf Behnke Jakob Salzmann Ralf Grossmann Dominik Lieckfeldt Dirk Timmermann Kerstin Thurow Institute of Applied Microelectronics and Computer Engineering University of Rostock Germany Center for Life Science Automation Rostock Germany

Localization of sensor nodes is one of the key issues in wireless sensor networks. Next to the ability, to assign a phenomenon to a position, localization is a precondition for sensor network algorithms like geographic clustering and routing. A simple approach for coarse grained localization is centroid localization (CL), which was firstly presented by Bulusu et al. and assumes regularly arranged beacons. The localization accuracy was improved by various centroid-based algorithms, which use approximate distances to improve location estimation through weighting beacons in range, e.g. weighted centroid localization (WCL). Nevertheless, all these approaches have in common an increased localization error near network borders. In this work, we investigate this error and present two strategies to reduce the localization error of border area nodes.

关键词： Wireless sensor networks Navigation computer networks Sensor phenomena and characterization Clustering algorithms Routing Algorithm design and analysis microelectronics Automation LAN interconnection

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A method for flexible aircraft LFT modelling

A method for flexible aircraft LFT modelling

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European Control Conference (ECC)

作者： J. Torralba F. Demourant G. Puyou G. Ferreres Department of Electronic Engineering Federal University of Minas Gerais Brazil Institute of Applied Microelectronics and Computer Engineering University of Rostock Rostock Germany

This paper presents a method to obtain a Linear Fractional Transformation (LFT) model from a set of numerical flexible aircraft models. The core of the method lies in a polynomial interpolation, but before this step, some cautious treatments must be applied to the numerical models for them to be interpolable. First the models have to be reduced to be exploitable, while ensuring they all keep the same consistent modal content and avoiding numerical problems. Second the interpolation of the reduced models state representations can only be processed if the state vector has the same physical meaning for the whole model set (state vector consistency). For this problem, a specific state coordinate transformation is emphasized. After models are interpolated, the LFT is computed with the LFR toolbox's generalized Morton method. Then the LFT accuracy can be improved through a biconvex optimization.

关键词： Atmospheric modeling Numerical models Aircraft Computational modeling Vectors Mathematical model Interpolation

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Web Services to improve interoperability of home healthcare devices

Web Services to improve interoperability of home healthcare ...

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International Conference on Pervasive Computing Technologies for Healthcare, PervasiveHealth

作者： Guido Moritz Elmar Zeeb Frank Golatowski Dirk Timmermann Regina Stoll Institute of Applied Microelectronics and Computer Engineering University of Rostock Rostock Germany Center for Life Science and Automation Rostock Germany Institute of Preventive Medicine University of Rostock Rostock Germany

Home healthcare can be divided into monitoring and assistance scenarios. In both scenarios, miscellaneous devices are applied for dedicated sensor or actuator functionalities. The requirements and assumptions for the different nodes split the devices in three different classes with particular characteristics concerning energy consumption, power supply, memory, computing power, and bandwidth. Nevertheless, the number of nodes and complexity of setups require new concepts like Service-oriented Architectures to solve arising problems. In this paper, the Devices Profile for Web Services is suggested as comprehensive middleware for all three device classes. Hence, Web services technologies, which are already applied in the internet and in automation industry, can avoid interoperability problems of sensors and actors in the domain of home healthcare also.

关键词： Web services Medical services Monitoring Sensor phenomena and characterization Actuators Energy consumption Power supplies Bandwidth Service oriented architecture Middleware

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