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Impact of the quality of spatial 3D city models on sensor networks placement optimization

Geomatica 2012年第4期66卷 291-305页

作者： Argany, Meysam Mostafavi, Mir Abolfazl Akbarzadeh, Vahab Gagné, Christian Yaagoubi, Reda Centre for Research in Geomatics Department of Geomatics Université Laval QC Canada Computer Vision and System Laboratory Department of Electrical Engineering and Computer Engineering Université Laval QC Canada Department of Geomatics Faculty of Environmental Design King Abdulaziz University Jeddah Saudi Arabia

Sensor networks are increasingly used for tracking, monitoring, and observing spatial dynamic phenomena in the real world (e.g. urban area). In order to ensure an efficient deployment of a sensor network, several optimization algorithms have been proposed in recent years. Most of these algorithms often rely on oversimplified sensor models. In addition, they do not consider information on the terrain topography, city models, and the presence of diverse obstacles in the sensing area (e.g. buildings, trees, poles). Only some of those optimization algorithms attempt to consider the terrain information in the optimization of a sensor network deployment. However, most of these algorithms consider that the spatial models used for this purpose are perfect representations of the reality and are not sensitive to the quality of the information. However, spatial models are simplified representations of a complex reality, and hence are inherently uncertain. In this paper we will investigate the impact of the spatial data quality on the optimization of a sensor network and its spatial coverage in an urban area. For this purpose, we will investigate specific implications of spatial data quality criteria for a 3D city model that will be used in sensor network optimization algorithms. Then, we will analyze the impact of some of those criteria on the estimation of sensor network coverage.!Afterwards, a case study for sensor network deployment in an urban area will be presented. This case study will demonstrate the impact of 3D city models quality on the estimation of coverage using global and local optimization algorithms. Finally, the results obtained from this experimentation will be presented and discussed.

关键词： Sensor networks

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design of Global Power systems Stabilizer to Damp Interarea Oscillations Based on Wide-Area Collocated Control Technique

Design of Global Power Systems Stabilizer to Damp Interarea ...

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IEEE Power and Energy Society General Meeting

作者： Jing Ma Tong Wang Zengping Wang Jie Wu James S. Thorp School of Electrical and Electronic Engineering North China Electric Power University and also with the Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University State Nuclear Electric Power Planning Design and Research Institute Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University

ISBN: (纸本)9781457710001

This paper develops a systematic procedure of designing global power system stabilizers (GPSSs) based on collocated control to enhance the damping during interarea oscillations. The availability of remote signals from phasor measurement units (PMUs) enables the wide-area control in large scale systems. The closed loop eigenvalues are excluded from a region of the complex plane by the collocated control algorithm guaranteeing that low frequency modes must be damped. The optimum locations for GPSSs were selected using controllability. The damping performance of a 16-machine, 68-bus study system reinforced with GPSSs is examined in the frequency and time domains. The simulation results show that the control scheme is able to damp out interarea oscillations following possible disturbances.

关键词： PMUs Interarea oscillations Collocated control Global power system stabilizers Phasor measurement units absorption of shock dinitrophenyl-aminopropyl-methylamine Oscillations Control technology Complex Plane Power system stability computer algorithms

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Digitally controlled integrated pseudo-CCM SIMO converter with adaptive freewheel current modulation

Digitally controlled integrated pseudo-CCM SIMO converter wi...

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Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： Yi Zhang Dongsheng Ma Integrated System Design Laboratory Department of Electrical and Computer Engineering University of Arizona Tucson Tucson AZ USA

ISBN: (纸本)9781424447824

In this paper, a digitally controlled integrated single-inductor multiple-output (SIMO) converter operating in pseudo-CCM (PCCM) mode is presented. With an adaptive freewheel current modulation (AFCM) technique, conduction loss of the freewheel switch is significantly reduced in unbalanced load conditions. Moreover, cross-regulation and switching noise are both effectively restricted. A prototype of a single-inductor dual-output (SIDO) boost converter was designed with a 130-nm CMOS process. The two outputs are regulated at 2.5 V and 1.8 V respectively, at a switching frequency of 500 KHz. The simulation results indicate that the expectant specifications are well implemented.

关键词： Digital control Programmable control Adaptive control Digital modulation Inductors Switches Switching converters Control systems Dynamic voltage scaling DC-DC power converters

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integrated switched-capacitor voltage doubler with clock transition periods boosting and transfer blocking techniques

Integrated switched-capacitor voltage doubler with clock tra...

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Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： Phong Ngo Dongsheng Ma Integrated System Design Laboratory Department of Electrical and Computer Engineering University of Arizona Tucson Tucson AZ USA

In this paper, a CMOS switched-capacitor voltage doubler is proposed. It employs the techniques of clock synchronization and charge transfer blocking to minimize the reversion loss. The clock transition period detection and boosting circuit modules allow continuous charge action to the output node, which significantly improves operation performances. The proposed voltage doubler was designed using IBM 180 nm CMOS process, with a 1.2 V supply voltage. Under no-load condition, it achieves 99.92% of ideal voltage level with 8 mV voltage ripple, while consuming only 9.6 ¿W of quiescent power. With a load ranging from 20 k¿ to 200 k¿, the up-conversion ratio performs 45% better than the prior arts.

关键词： Clocks Boosting Charge transfer Switching converters Charge pumps Power supplies Timing Capacitors Threshold voltage Topology

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Rendering Adaptation to Address Communication and Computation Constraints in Cloud Mobile Gaming

Rendering Adaptation to Address Communication and Computatio...

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2010 IEEE Global Telecommunications Conference GLOBECOM 2010

作者： Shaoxuan Wang Sujit Dey Mobile System Design Laboratory Department of Electrical and Computer Engineering University of California San Diego USA

A new Cloud Mobile Gaming (CMG) approach, where the responsibility of executing the gaming engines, including the most compute intensive tasks of graphic rendering, is put on cloud servers instead of the mobile devices, has the potential for enabling mobile users to play the same rich Internet games available to PC users. However, the mobile gaming user experience may be limited by the communication constraint imposed by available wireless networks and computation constraint imposed by the cost and availability of cloud servers. In this paper, we propose a rendering adaptation technique which can adapt the game rendering parameters to satisfy CMG communication and computation constraints, such that the overall mobile gaming user experience is maximized. Experiments conducted on a commercial UMTS network demonstrate that the proposed rendering adaptation techniques can make the CMG approach feasible: ensuring protection against wireless network conditions, and ensuring server computation scalability, thereby ensuring acceptable mobile gaming user experience.

关键词： Rendering (computer graphics) Games Servers Mobile communication Engines Graphics processing unit

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Map Based Indoor Robot Navigation and Localization Using Laser Range finder

Map Based Indoor Robot Navigation and Localization Using Las...

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International Conference on Control, Automation, Robotics and Vision

作者： Shung Han Cho Sangjin Hong Department of Electrical and Computer Engineering Mobile System Design Laboratory Stony Brook University - SUNY Stony Brook NY USA

ISBN: (纸本)9781424478149

This paper presents a map based robot navigation and localization algorithm using laser range finder for indoor environments. A navigation path is given by the sequence of grids and global map information is represented by the list of vertexes. The grid based navigation facilities path planning as well as complements localization with priori information of the grid sequence. The pattern of vertexes is represented by distance, adjacency, and slant among them for the comparison between map information and range data. A mobile robot is globally localized by finding the matched pattern between the set of vertexes from the map and the set of vertexes from the range data. The proposed method is verified with actual range data from laser range finder.

关键词： map representation indoor robot navigation localization laser range finder

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Random force based algorithm for local minima escape of potential field method

Random force based algorithm for local minima escape of pote...

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International Conference on Control, Automation, Robotics and Vision (ICARCV)

作者： Jinseok Lee Yunyoung Nam Sangjin Hong Department of Electrical and Computer Engineering Mobile System Design Laboratory Stony Brook University-SUNY Stony Brook NY USA

We address a new inherent limitation of potential field methods, which is symmetrically aligned robot-obstacle-goal (SAROG). The SAROG involves one critical risk of local minima trap. For dealing with the problem, we investigate the way how the local minima trap is recognized, and present our random force algorithm. The force algorithm has two categories of random unit total force (RUTF) and random unit total force with repulsion removal (RUTF-RR) which are selected based on the conditions of a robot, an obstacle and a goal.

关键词： Force Collision avoidance Robot kinematics Robot sensing systems Mobile robots Oscillators

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XML defined custom microprocessors using Rapid Hardware Definition Language

XML defined custom microprocessors using Rapid Hardware Defi...

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IEEE National Conference on Aerospace and Electronics (NAECON)

作者： Jacob N. Allen Hoda S. Abdel-Aty-Zohdy Robert L. Ewing Microelectronics System Design Laboratory Department of Electrical and Computer Engineering Oakland University Rochester Hills MI USA Air Force Research Laboratory OH USA

Rapid HDL is an object oriented software library for scripting the generation of synthesizable Verilog. A fully functional customized microprocessor is defined and automatically synthesized for an FPGA from an XML specification file. Using a library of blocks, a microprocessor fabric is defined in XML. Control states specify the connections between the fabric blocks during microprocessor operation. Opcodes sequence the control states and provide a vocabulary for assembly programs, which are compiled and executed on the microprocessor.

关键词： Microprocessors Hardware design languages Hardware XML Registers Fabrics Software

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A DLL-regulated SIMO power converter for DVS-enabled power-aware VLSI systems

A DLL-regulated SIMO power converter for DVS-enabled power-a...

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Midwest Symposium on Circuits and systems (MWSCAS)

作者： Rajdeep Bondade Dongsheng Ma Integrated System Design Laboratory Department of Electrical & Computer Engineering University of Arizona Tucson Tucson AZ USA

A delay-locked loop (DLL) regulated single-inductor multiple-output (SIMO) power converter is presented. It takes advantage of the fast phase locking property of a DLL to identify the SIMO converter's regulation errors between the output voltages and their corresponding references. In response to these errors, an adaptive peak current modulation technique is proposed to adjust the instantaneous duty ratios, and thus minimize the regulation errors in the converter. The DLL acquires locking within 350 ns, allowing it to respond to load dynamics promptly, which is very desirable for DVS-enabled power-efficient VLSI systems. The system was designed and simulated in IBM 130-nm CMOS process. Fully transistor-based HSPICE simulations show that, with a 1.8 V nominal input supply, the converter precisely regulates two independent output voltages at 0.9 V and 1.5 V, respectively. It achieves the maximum efficiency of 87.2% at a total power of 104.8 mW and a switching frequency of 500 kHz.

关键词： Very large scale integration Pulse width modulation Error correction Voltage control Delay Inductors integrated circuit noise DC-DC power converters Network-on-a-chip Power dissipation

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Modeling and Characterizing User Experience in a Cloud Server Based Mobile Gaming Approach

Modeling and Characterizing User Experience in a Cloud Serve...

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GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

作者： Shaoxuan Wang Sujit Dey Mobile System Design Laboratory Department of Electrical and Computer Engineering University of California Los Angeles San Diego USA

With the evolution of mobile devices and networks, and the growing trend of mobile Internet access, rich, multi-player gaming using mobile devices, similar to PC-based Internet games, has tremendous potential and interest. However, the current client-server architecture for PC-based Internet games, where most of the storage and computational burden of the game lies with the client device, does not work with mobile devices, constraining mobile gaming to either downloadable, single player games, or very light non-interactive versions of the rich multi-player Internet games. In this paper, we study a cloud server based approach, termed Cloud Mobile Gaming (CMG), where the burden of executing the gaming engines is put on cloud servers, and the mobile devices just communicate the users' gaming commands to the servers. We analyze the factors affecting the quality of user experience using the CMG approach, including the game genres, video encoding factors, and the conditions of the wireless network. Based on the above analysis, we develop a model for Mobile Gaming User Experience (MGUE), and develop a prototype for real-time measurement of MGUE that can be used in real networks. We validate MGUE model using controlled subjective testing, and then use it to characterize user experience achievable using the CMG approach in wireless networks.

关键词： Clouds Web server Network servers IP networks Internet Mobile computing Wireless networks computer architecture Search engines Games

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