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Automatic Mobile Vehicle for Adaptive Real-Time Communication Relay

Automatic Mobile Vehicle for Adaptive Real-Time Communicatio...

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international conference on distributed computing systems Workshop

作者： Hai Hu Furong Wang Fan Zhang Weijia Jia Ge Tang Department of Electronics & Information Engineering Huazhong University of Science and Technology Wuhan China Department of Computer Science City University of Hong Kong Hong Kong China State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing Wuhan University of China Wuhan China

For the currently popular WiFi networks, the problem of communication blind spots is more acute, since the access points (APs) are not placed according to a central plan. In this paper, we design an Cyber physical system (CPS) based on an automatic mobile vehicle (AMV) to guarantee the quality of service (QoS) of real-time applications in WiFi networks. When a user enters the blind spot regions, the AMV is able to detect the deterioration of the userpsilas service quality and then move automatically to an appropriate position between the user and AP to serve as a multimedia repeater for the user and maintain the communication quality. Technologies in many fields, such as WiFi and sensor detection, are integrated in our system. In WiFi networks, AMV makes use of received signal strength indicator (RSSI) to evaluate the network quality. through configuring many types of sensors, such as acceleration sensors and supersonic sensors, we are able to control the speed and direction of AMV, and effect obstacle avoidance. AMV can intelligently compute the best location to perform relaying based on collected statistics of peripheral sensors. It can also support uninterrupted real-time video transmission.

关键词： Vehicles Mobile communication Relays Intelligent sensors Quality of service Real time systems Repeaters sensor systems Acceleration Computer peripherals

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A commutative replicated data type for cooperative editing

A commutative replicated data type for cooperative editing

引用

ieee international conference on distributed computing systems

作者： Nuno Preguiga Joan Manuel Marques Marc Shapiro Mihai Letia CITI/FCT-Universidade Nova de Lisboa Universitat Oberta de Catalunya INRIA Paris-Rocquencourt and LIP6 Ecole Normale Suprieure de Lyon and LIP6

ISBN: (纸本)9781424444816

A Commutative Replicated Data Type (CRDT) is one where all concurrent operations commute. the replicas of a CRDT converge automatically, without complex concurrency control. this paper describes Treedoc, a novel CRDT design for cooperative text editing. An essential property is that the identifiers of Treedoc atoms are selected from a dense space. We discuss practical alternatives for implementing the identifier space based on an extended binary tree. We also discuss storage alternatives for data and meta-data, and mechanisms for compacting the tree. In the best case, Treedoc incurs no overhead with respect to a linear text buffer. We validate the results with traces from existing edit histories.

关键词： data types concurrency operation Metadata REPLICA Commutative editing text processing

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Synthesis of a fuzzy controller for the navigation of an electricwheelchair for handicapped

Synthesis of a fuzzy controller for the navigation of an ele...

引用

ieee SSD international Multi-conference on systems, Signals and Devices

作者： Malek Njah Mohamed Jallouli Research unit on Intelligent Control design & Optimization of complex Systems (ICOS) Sfax Engineering School University of Sfax Sfax Tunisia

Many researchers are interested in electric wheelchair automation because of the mobility problemsmet by a certain number of disabled and aged people. In this paper, we propose to associate a system's help navigation to a standard electric *** system is equipped with unit control and sensors to extract some *** elaborate a fuzzy controller which generates speed wheels orders in order to join the target position.

关键词： Fuzzy control Navigation Automatic generation control Control systems Control system synthesis Automatic control Wheelchairs Automation Aging sensor systems

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Ratio-based zero-profiling indoor localization

Ratio-based zero-profiling indoor localization

引用

ieee Internatonal conference on Mobile Adhoc and sensor systems (MASS)

作者： Xiaoyan Li Department of Computer Science Lafayette College Easton PA USA

ISBN: (纸本)9781424451142

Wireless signal propagation in indoor environments is generally affected by various factors such as multi-path fading, temperature and humidity. It is thus challenging to use the simple metric of Received Signal Strength (RSS) for indoor localization. Prior work often requires manual profiling of each indoor environment to achieve good accuracy. We, instead, propose a simple generic localization algorithm that can be applied in any indoor environment without profiling. Our algorithm makes use of a simple signal propagation model and accepts a broad characterization of the environmental effect. the algorithm's simplification results in some accuracy loss compared to profiling-based algorithms. We, however, believe that our algorithm's zero-profiling requirement would make it favorable in many scenarios, especially when extensive profiling is not affordable or it is favored to trade a little accuracy for saved human effort. Evaluations also show that deployment of additional landmarks can be combined with our algorithm to compensate the accuracy loss, thus achieving good accuracy without profiling.

关键词： Indoor environments Fingerprint recognition Wireless sensor networks Humans Electromagnetic scattering Computer science Educational institutions Fading Temperature Humidity

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A global scheme for multiple and simultaneous faults in system actuators and sensors

A global scheme for multiple and simultaneous faults in syst...

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ieee SSD international Multi-conference on systems, Signals and Devices

作者： D. Fragkoulis G. Roux B. Dahhou Department of Automation TEI of Pireaus Athens Greece LAAS-CNRS Université de Toulouse Toulouse France UPS Université de Toulouse France

In this paper, we study the case of more than one faults can occur in the system with a small delay between them or in the same time. We assume that only one type of fault can occur and we will focus on the actuator and sensor faults. the sensor fault problem will be reformulated to an actuator fault one by introducing a state variable transformation, so that an augmented system is constructed. thus we will design a nonlinear model based adaptive observer method, for detection, isolation and identification of actuator and sensor multiple and simultaneous faults. these approaches use the system model and the outputs of the adaptive observers to generate residuals. Residuals are defined in such way to isolate the faulty instrument after detecting the fault. the validity of the method will be tested in simulation of a nonlinear waste water treatment process.

关键词： Actuators sensor systems Fault detection Fault diagnosis Nonlinear systems Wastewater treatment Delay effects Instruments Testing Real time systems

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iTracking: Accurate light-based location-tracking in wireless sensor networks

iTracking: Accurate light-based location-tracking in wireles...

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ieee Internatonal conference on Mobile Adhoc and sensor systems (MASS)

作者： Andong Zhan Shen Li Tao Li Lubin Guan Panlong Yang Xiaobing Wu Guihai Chen State Key Laboratory of Novel Software Technology Nanjing University Nanjing China Institute of Communication Engineering of PLAUST Nanjing China

Most previous localization and tracking systems in wireless sensor networks are based on RF signals, ultrasounds, and UWB. However, systems using RF signals suffer accuracy fluctuations and systems using ultrasound or UWB need extra hardware. In our paper, we propose to utilize light, an easily accessible and pervasive resource in our daily life, and off-the-shelf TelosB Motes to achieve the goal of stability and high accuracy in localization and tracking. the iTracking system is a mobile light source location-tracking system based on light intensity. Our main contribution is the first demonstration to track mobile light sources based on light intensity with high accuracy, which may provide an alternative method for localization and tracking or inspire game designers. We examine point light based tracking and flashlight based tracking in our demonstrations, which proves these two main sources of light in our daily life can achieve centimeter-level location-tracking requirements. Our future work will focus on enabling the iTracking system to writing Chinese characters in flashlight.

关键词： Wireless sensor networks Light sources Ultrasonic imaging Fluctuations Hardware Light emitting diodes Tracking Laboratories Communication system software Stability

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A Proportional Fair Backoff scheme for wireless sensor networks

A Proportional Fair Backoff scheme for wireless sensor netwo...

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ieee Internatonal conference on Mobile Adhoc and sensor systems (MASS)

作者： Yuanfang Chen Mingchu Li Lei Wang Zhuxiu Yuan Weiping Sun Chunsheng Zhu Ming Zhu Lei Shu School of Software Dalian University of Technology China Digital Enterprise Research Institute National University of Ireland Galway Ireland

this paper aims at improving the throughput of the wireless sensor networks (WSNs), particularly to overcome the so-called funneling effect for WSNs with converge-cast patterns. Due to the disproportionate larger number of packets accumulated in the sensors that are closer to the sink, there is a need to decrease the collisions and increase the throughput around the sink area as well as the nodes that experience a heavy pass-through traffic. In this paper, we proposed a new scheme, namely PFB (Proportional Fairness Backoff), which provides additional scheduling opportunities to nodes closer to the sink. the new scheme employs Kelly's shadow price theory to achieve the proportional fairness, which takes advantage of the tree topology that is the de facto standard in today's WSNs. In PFB, the size of backoff window is dynamically adjusted with respect to the height of nodes belong in the tree. With close-form analysis and extensive simulations, we show that PFB can achieve up to 100% throughput increase over the widely used CSMA when the network is highly loaded.

关键词： Wireless sensor networks throughput Media Access Protocol Road accidents Multiaccess communication Analytical models Collision avoidance Base stations Sun Paper technology

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Focused-coverage by mobile sensor networks

Focused-coverage by mobile sensor networks

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ieee Internatonal conference on Mobile Adhoc and sensor systems (MASS)

作者： Xu Li Hannes Frey Nicola Santoro Ivan Stojmenovic SITE University of Ottawa Canada CS University of Paderborn Germany SCS Carleton University Canada

ISBN: (纸本)9781424451142

We pinpoint a new sensor self-deployment problem, constructing focused coverage around a point of interest (POI), and introduce an evaluation metric, coverage radius. We propose two solutions, greedy advance (GA) and greedy-rotation-greedy (GRG), which are to our knowledge the first sensor self-deployment algorithms that operate in a purely localized manner and yet provide coverage guarantee. the two algorithms drive sensors to move along a locally-computed equilateral triangle tessellation (TT) to surround POI. In GA, nodes greedily proceed as close to POI as they can; in GRG, when their greedy advance is blocked, nodes rotate around POI to a TT vertex where greedy advance can resume. they both yield a connected network of TT layout with hole-free coverage; GRG furthermore assures a hexagon coverage shape centered at POI. We prove their correctness and analyze their coverage radius property. Our study shows that GRG guarantees optimal hexagonal coverage radius and near optimal circular coverage radius. through extensive simulation we as well evaluate their performance on convergence time, energy consumption, and node collision.

关键词： Resumes Shape Convergence Energy consumption

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Secure self-adaptive mission-critical communication for distributed smart home sensor network

Secure self-adaptive mission-critical communication for dist...

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international conference on Mobile and Ubiquitous systems: Networking and Services (MobiQuitous)

作者： Rajani Muraleedharan Lisa Ann Osadciw Department of Electrical Engineering and Computer Science Syracuse University Syracuse NY USA

the inexpensive tiny wireless sensor can be embedded in devices to enable any commercial application, but are prone to intruder attacks. Due to the limited resource constraint in wireless sensor network, security in protocols is sacrificed or kept minimal. the distributive and self-organizing nature of sensor based on environment requires protocol to be adaptive, energy efficient and secure. In this paper, we analyze the different encryption schemes and their shortcoming in providing an energy efficient solution for sensor network. Secondly, we propose a communication protocol that balances resources while achieving mission critical solution using bio-inspired multi-objective algorithm. thirdly, the accuracy of threat detection is analyzed using threshold approach based on sensor characteristics.

关键词： Mission critical systems Smart homes Intelligent sensors Biosensors Wireless sensor networks Energy efficiency sensor phenomena and characterization Communication system security Wireless application protocol Cryptography

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Electron-beam processed SAW devices for sensor applications

Electron-beam processed SAW devices for sensor applications

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ieee SSD international Multi-conference on systems, Signals and Devices

作者： Marc Loschonsky David Eisele Jeremy Masson Sebastien Alzuaga Armin Dadgar Sylvain Ballandras Leonhard Reindl Department of Microsystem Engineering (IMTEK) University of Freiburg Freiburg im Breisgau Germany SENSeOR SAS Sophia-Antipolis France FEMTO-ST Institute Besancon France Azzurro Semiconductors AG Magdeburg Germany

In this paper, electron-beam (e-beam) lithography for processing of surface acoustic wave devices is investigated, and its suitability for large-scale processing discussed. Electron-beam lithography is used for exposure of surface acoustic wave (SAW) resonator patterns on polymethyl methacrylate (PMMA) coated piezoelectric substrates. Electron-beam lithography can be used for high frequency SAW designs, due to a minimal finger width of 100 nm to 400 nm. Such SAW devices can be used for high-frequency sensor applications. this contribution will consider processing, on-wafer characterization, and characterization of sensor effects in instrumentation applications.

关键词： Surface acoustic wave devices Lithography Acoustic sensors Acoustic waves Surface acoustic waves sensor phenomena and characterization Large-scale systems Frequency Fingers Instruments

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