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On-Chip 2-Axis Optical Fiber Actuator Using Gray-Scale Technology

On-Chip 2-Axis Optical Fiber Actuator Using Gray-Scale Techn...

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IEEE International Conference on Micro Electro Mechanical systems

作者： B. Morgan R. Ghodssi MEMS Sensors and Actuators Laboratory (MSAL) Department of Electrical and Computer Engineering The Institute for Systems Research University of Maryland College Park MD USA

We report a new on-chip method for actuating an optical fiber in 2-axes. Opposing comb-drive actuators with integrated 3-D wedges (fabricated using gray-scale technology [ 1, 2]) create a translatable, variable height v-groove to alter the horizontal and vertical alignment of an optical fiber cantilever. Such an actuator is attractive for on-chip active alignment of fiber optics to edge-coupled optoelectronic devices. The design and fabrication of this variable height actuator is conducive to batch fabrication since all structural components are fabricated in silicon using a single lithography and dry-etching step. Actuation of a cleaved fiber tip > 20 µ m in each direction is demonstrated.

关键词： Optical fibers Actuators Gray-scale Optical fiber devices Micromechanical devices Packaging Optical device fabrication Optical fiber testing Optical waveguides System-on-a-chip

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Analysis of Common Mode Voltage in Fuel Cell Power Conditioners Connected to Electric Utility

Analysis of Common Mode Voltage in Fuel Cell Power Condition...

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IEEE International Conference on Industrial Technology (ICIT)

作者： L. Palma P. Enjeti Power Electronics & Fuel Cell Power Systems Laboratory Department of Electrical & Computer Engineering Texas A and M University College Station TX USA

Fuel cell stacks produce a DC output with a 2:1 variation in output voltage from no load to full load. A power conditioner consisting of DC-DC and DC-AC converters is required for utility interface. The DC-DC and DC-AC stages are operated in high frequency employing PWM control for voltage and current regulation. The switch mode nature of the power converter generates common mode voltage with respect to ground. The presence of high frequency common mode voltage with respect to ground contributes to circulating ground current which can interfere with ground fault protection system and also contribute to neutral shift and electro magnetic interference (EMI). This paper presents an analysis of common mode voltage in fuel cell powered converters connected to electric utility and discusses several mitigation methods. Several possible fuel cell power converter topologies are considered for utility scale generation.

关键词： Fuel cells Power industry Frequency Pulse width modulation Switches Power generation DC-DC power converters Voltage control Current control Switching converters

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Single differential modulation and detection for MPSK in the presence of unknown frequency offset

Single differential modulation and detection for MPSK in the...

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40th Asilomar Conference on Signals, systems, and computers, ACSSC '06

作者： Liu, Jianhua Stoica, Petre Simon, Marvin Li, Jian Department of Electrical and Systems Engineering Embry-Riddle Aeronautical University Daytona Beach FL 32114 United States Department of Systems and Control Uppsala University P.O. Box 337 SE-75105 Uppsala Sweden Jet Propulsion Laboratory MS 238-343 4800 Oak Grove Drive Pasadena CA 91109 United States Department of Electrical and Computer Engineering University of Florida P.O. Box 116130 Gainesville FL 32611-6130 United States

ISBN: (纸本)1424407850

We consider improving the performance of communications over unknown channels with unknown frequency offsets. In lieu of the commonly suggested double differential (DD) modulation/detection, we consider single differential (SD) modulation/detection. We propose an approach that first estimates and compensates for the frequency offset and then detects using an existing multiple symbol detector for SD modulation. We introduce a simple data-symbol- independent frequency offset estimation method, which is reasonably accurate when using a data block larger than the one used for detection. Simulation results show that the SD modulation/detection approach proposed herein can significantly outperform the DD modulation/detection schemes.

关键词： Signal detection

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Integrated information processing and communications: Complexity analysis

Integrated information processing and communications: Comple...

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IASTED International Conference on COMMUNICATION systems AND APPLICATIONS Part of the Sixth IASTED International Multi-Conference on WIRELESS AND OPTICAL COMMUNICATIONS

作者： Huyu, Qu Le, Yi Wang Yaprak, Ece Hong, Wang Yanlong, Zhao Department of Electrical and Computer Engineering Wayne State University Detroit MI 48202 United States Division of Engineering Technology Wayne State University Detroit MI 48202 United States Department of Anesthesiology Wayne State University Detroit MI 48202 United States Key Laboratory of System and Control Academy of Mathematics and Systems Science Chinese Academy of Sciences China

Accuracy of information transmission when a signal must be transmitted through a communication channel is of essential importance in design of communication systems. When system resources are limited, such as transmission bandwidths assigned to a wireless communication channel, appropriate utility of available resources becomes imperative. This paper investigates fundamental relationships between accuracy of information exchange and communication resources, on a platform of wireless communication channels that involve typical system blocks of data compression, quantization, and stochastic wireless channels. The main complexity relationships developed in this paper provide rigorous trade-off between resource consumptions and information processing errors of each block. When these relationships are integrated, an optimization procedure emerges that allows optimal allocation of resources to each system block, such as compression ratio, quantization levels, and transmission speed, to maximize overall information accuracy. Consequently, the overall errors of the transmitted signal will be minimized at the receiver end.

关键词： Data processing

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A Reinforcement Learning Framework for Medical Image Segmentation

A Reinforcement Learning Framework for Medical Image Segment...

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International Joint Conference on Neural Networks (IJCNN)

作者： F. Sahba H.R. Tizhoosh M.M.A. Salama Pattern Analysis and Machine Intelligence Laboratory Department of System Design Engineering University of Waterloo Waterloo ONT Canada Department of Electrical and Computer Engineering University of Waterloo Waterloo ONT Canada

This paper introduces a new method to medical image segmentation using a reinforcement learning scheme. We use this novel idea as an effective way to optimally find the appropriate local thresholding and structuring element values and segment the prostate in ultrasound images. Reinforcement learning agent uses an ultrasound image and its manually segmented version and takes some actions (i.e., different thresholding and structuring element values) to change the environment (the quality of segmented image). The agent is provided with a scalar reinforcement signal determined objectively. The agent uses these objective reward/punishment to explore/exploit the solution space. The values obtained using this way can be used as valuable knowledge to fill a Q-matrix. The reinforcement learning agent can use this knowledge for similar ultrasound images as well. The results demonstrate high potential for applying reinforcement learning in the field of medical image segmentation.

关键词： Learning Biomedical imaging Image segmentation Ultrasonic imaging Medical diagnostic imaging Pattern analysis Machine intelligence Laboratories System analysis and design design engineering

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design of Compliant MEMS Grippers for Micro-Assembly Tasks

Design of Compliant MEMS Grippers for Micro-Assembly Tasks

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2006 IEEE/RSJ International Conference on Intelligent Robots and systems

作者： Byoung Hun Kang John T. Wen Department of Mechanical Design Engineering Korea Polytechnic University Kyunggi South Korea Mechanical AeroSpace and Nuclear Engineering Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY USA

Due to their monolithic construction and superior wear and loss properties, flexure joints have been used to reduce the mechanism size and increase the positioning accuracy. The compliance of flexure joints, however, can affect the static and dynamic characteristics of the overall mechanism. To design mechanisms containing flexure joints, we have proposed a multi-objective optimization approach to take into account the multitude of performance metrics and design constraints. A Pareto frontier is first computed, and secondary design criteria, such as sensitivity and dynamic characteristics, are then applied to select the final design. To reduce the computation load and facilitate design iteration, a lumped spring approximation, the Paros-Weisbord model, is used to characterize the flexure joints and the pseudo-rigid-body model is used as an approximate description of mechanisms. This paper presents this approach applied to the design of a micro-gripper. The performance metrics are chosen to be the manipulability of the gripper opening and the decoupling of a stiffness matrix (reflecting the remote center of compliance criterion). Different design and initial fabrication results are included

关键词： Micromechanical devices Grippers design optimization Topology Stress design engineering Fabrication Assembly Aerodynamics Measurement

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The robot software communications architecture (RSCA): embedded middleware for networked service robots 06

The robot software communications architecture (RSCA): embed...

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International Symposium on Parallel and Distributed Processing (IPDPS)

作者： Seongsoo Hong Jaesoo Lee Hyeonsang Eom Gwangil Jeon Real-Time Operation Systems Laboratory School of Electrical Engineering and Computer Science Seoul National University of Technology Seoul South Korea Distributed Information Processing Laboratory School of Computer Science and Computer Engineering Seoul National University of Technology Seoul South Korea Department of Computer Engineering Korea Polytechnic University Siheung Gyeonggi South Korea

ISBN: (纸本)9781424400546

In this paper, we present a robot middleware technology named robot software communications architecture (RSCA) for its use in networked home service robots. The RSCA provides a standard operating environment for the robot applications together with a framework that expedites the development of such applications. The operating environment is comprised of a real-time operating system, a communication middleware, and a deployment middleware. Particularly, the deployment middleware supports the reconfiguration of component-based robot applications including installation, creation, start, stop, tear-down, and un-installation. In designing RSCA, we have adopted a middleware called SCA from the software defined radio domain and extend it since the original SCA lacks the real-time guarantees and appropriate event services. We have fully implemented RSCA and performed measurements to quantify its run-time performance. Our implementation clearly shows the viability of RSCA

关键词： Embedded software computer architecture Middleware Service robots Application software Standards development Real time systems Operating systems Software radio Performance evaluation

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Effect of RObust Header Compression (ROHC) and Packet Aggregation on Multi-hop Wireless Mesh Networks

Effect of RObust Header Compression (ROHC) and Packet Aggreg...

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International Conference on computer and Information Technology (CIT)

作者： Sangkil Jung Sangjin Hong Peom Park Mobile Systems Design Laboratory Department of Electrical and Computer Engineering Stony Brook University-SUNY Stony Brook NY USA Humintec Company Limited Suwon South Korea Department of Industrial and Information Engineering Ajou University South Korea

This paper evaluates the behavioral effect of RObust Header Compression (ROHC) and packet aggregation in multi-hop wireless mesh networks. ROHC itself shows around 20% achieved rate improvement on a line of wireless link even if as the number of mesh router increases, total achieved rate gradually decreases. Packet aggregation cooperating with ROHC provides 4 to 10 times achieved rate improvement and results in maximum 6 times reduction of end-to-end delay. Even if the ROHC and packet aggregation gives such a promising improvement, we need to identify effect of the processing time of the two schemes on overall wireless mesh network behaviors. To do this work, we measure/use ROHC processing time from Pentium 4 and RouterBOARD 230, and apply the results into NS-2 simulations. The simulation results show high performance improvement from ROHC and packet aggregation deteriorates as a general purpose processor in a mesh router takes much time to deal with the two schemes. This result motivates a hardware design be required to speed up the processing units of the two schemes. Consequently, we propose a hardware system model for ROHC and packet aggregation by using SystemC Hardware Description Language (HDL). From the SystemC results, we conclude the proposed built-in processor design for the two schemes keeps performance improvement by enhancing the low speed processing power of general purpose processors.

关键词： Robustness Spread spectrum communication Wireless mesh networks Wireless sensor networks Hardware design languages Land mobile radio cellular systems Delay IP networks Mesh networks Time measurement

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Power System Control with an Embedded Neural Network in Hybrid System Modeling

Power System Control with an Embedded Neural Network in Hybr...

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： Seung-mook Baek Jung-wook Park Ganesh K. Venayagamoorthy Power IT and System Laboratory School of Electrical and Electronic Engineering YONSEI University Seoul South Korea Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla MO USA

The output limits of the power system stabilizer (PSS) can improve the system damping performance immediately following a large disturbance. Due to non-smooth nonlinearities from the saturation limits, these values cannot be determined by the conventional tuning methods based on linear analysis. Only ad hoc tuning procedures can be used. A feedforward neural network (FFNN) (with a structure of multilayer perceptron neural network) is applied to identify the dynamics of an objective function formed by the states, and thereafter to compute the gradients required in the nonlinear parameter optimization. Moreover, its derivative information is used to replace that obtained from the trajectory sensitivities based on the hybrid system model with the differential-algebraic-impulsive-switched (DAIS) structure. The optimal output limits of the PSS tuned by the proposed method are evaluated by time-domain simulation in both a single machine infinite bus system (SMIB) and a multi-machine power system (MMPS)

关键词： Power system control Neural networks Hybrid power systems Power system modeling Multi-layer neural network Feedforward neural networks Power system simulation Power system analysis computing Damping Multilayer perceptrons

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Introducing RapidHDL: A New Library to design FPGA Hardware in Microsoft. Net and Automatically Generate Verilog Netlists

Introducing RapidHDL: A New Library to Design FPGA Hardware ...

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IEEE International Conference on Electro-Information Technology

作者： Jacob N. Allen Hoda S. Abdel-aty-zohdy Robert L. Ewing Microelectronics System Design Lab Department of Electrical and Computer Engineering Oakland University Rochester MI USA Information Directorate Air Force Research Laboratory USA

RapidHDL is introduced as a new object oriented hardware description library for C# developers. RapidHDL seeks to speed up FPGA development by applying best practices used in software engineering to increase productivity. Logic is rapidly defined in component classes using a structure of truth-table definitions, sink nodes, source nodes, and pass-through nodes. Hardware simulation co-runs with C# programs, and a linked-list of clock events simulates propagation delays. A standardized testing framework allows the developer to write test benches, hardware, and software in a single language. Algorithms are presented to automatically transform RapidHDL objects to Verilog netlist that can be synthesized by calling 3rd party tools

关键词： Field programmable gate arrays Hardware design languages Software libraries Object oriented modeling Discrete event simulation Software testing Best practices Software engineering Productivity Logic

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