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A high-order log barrier-based mesh generation and warping method

Procedia engineering 2017年 203卷 180-192页

作者： Mike Stees Suzanne M. Shontz Department of Electrical Engineering and Computer Science Information and Telecommunication Technology Center The University of Kansas Lawrence KS 66045 USA Department of Electrical Engineering and Computer Science Bioengineering Graduate Program Information and Telecommunication Technology Center The University of Kansas Lawrence KS 66045 USA

The ability to generate high-order meshes that conform to the boundary of curved geometries is a hurdle in the adoption of high-order computational methods for the numerical solution of partial differential equations. In this paper, we propose a method for generating and warping second-order Lagrange triangular and tetrahedral meshes based on a log barrier method. In the case of generation, the approach consists of modifying an initial linear mesh by first, adding nodes at the midpoint of each edge; second, displacing the newly added boundary midpoints to the curved boundary, and third, solving for the final positions of the interior nodes based on the boundary deformation. By allowing all of the boundary nodes to move, the approach can also be used to warp second-order triangular and tetrahedral meshes. We present several numerical examples in both two and three dimensions which demonstrate the capabilities of our method in generating and warping second-order curvilinear meshes.

关键词： high-order mesh generation curvilinear high-order mesh high-order mesh warping numerical optimization

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Calibrationless parallel imaging reconstruction based on structured low-rank matrix completion

Calibrationless parallel imaging reconstruction based on str...

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作者： Shin, Peter J. Larson, Peder E. Z. Ohliger, Michael A. Elad, Michael Pauly, John M. Vigneron, Daniel B. Lustig, Michael Department of Radiology and Biomedical Imaging University of California at San Francisco San FranciscoCA United States UC Berkeley-UCSF Graduate Program in Bioengineering CA United States Department of Electrical Engineering and Computer Science University of California at Berkeley BerkeleyCA United States Department of Computer Science Technion'Israel Institute of Technology Haifa Israel Magnetic Resonance Systems Research Laboratory Department of Electrical Engineering Stanford University StanfordCA United States

Purpose: A calibrationless parallel imaging reconstruction method, termed simultaneous autocalibrating and k-space estimation (SAKE), is presented. It is a data-driven, coil-by-coil reconstruction method that does not require a separate calibration step for estimating coil sensitivity information. Methods: In SAKE, an undersampled, multichannel dataset is structured into a single data matrix. The reconstruction is then formulated as a structured low-rank matrix completion problem. An iterative solution that implements a projection-ontosets algorithm with singular value thresholding is described. Results: Reconstruction results are demonstrated for retrospectively and prospectively undersampled, multichannel Cartesian data having no calibration signals. Additionally, non-Cartesian data reconstruction is presented. Finally, improved image quality is demonstrated by combining SAKE with wavelet-based compressed sensing. Conclusion: Because estimation of coil sensitivity information is not needed, the proposed method could potentially benefit MR applications where acquiring accurate calibration data is limiting or not possible at all. © 2013 Wiley Periodicals, Inc.

关键词： Compressed sensing

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electrical characteristics of biomodified electrodes using nonfaradaic electrochemical impedance spectroscopy

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World Academy of science, engineering and Technology 2011年 73卷 295-299页

作者： Yusof, Yusmeeraz Yanagimoto, Yoshiyuki Uno, Shigeyasu Nakazato, Kazuo Department of Electrical Engineering and Computer Science Graduate School of Engineering Nagoya University Japan Agilent Technologies International Japan Ltd Kobe 651-2241 Japan

We demonstrate a nonfaradaic electrochemical impedance spectroscopy measurement of biochemically modified gold plated electrodes using a two-electrode system. The absence of any redox indicator in the impedance measurements provide more precise and accurate characterization of the measured bioanalyte at molecular resolution. An equivalent electrical circuit of the electrodeelectrolyte interface was deduced from the observed impedance data of saline solution at low and high concentrations. The detection of biomolecular interactions was fundamentally correlated to electrical double-layer variation at modified interface. The investigations were done using 20mer deoxyribonucleic acid (DNA) strands without any label. Surface modification was performed by creating mixed monolayer of the thiol-modified single-stranded DNA and a spacer thiol (mercaptohexanol) by a two-step self-assembly method. The results clearly distinguish between the noncomplementary and complementary hybridization of DNA, at low frequency region below several hundreds Hertz.

关键词： DNA

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Hybrid clutter canceler with feedback guided predicative filtering on a heterogeneous parallel processing system

Hybrid clutter canceler with feedback guided predicative fil...

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international Waveform Diversity and Design Conference

作者： Jeffrey M. Brinkhus Joseph A. Jezak Charles Berdanier Steven P. Levitan Donald M. Chiarulli Electical and Computer Engineering University of Pittsburgh Computer Engineering Graduate Program University of Pittsburgh Electrical Engineering Wright State University Computer Science Department University of Pittsburgh

In this paper we describe a novel clutter cancellation platform based on a two stage approach that combines a feedback guided predictive front-end hybrid clutter canceller with high performance back-end filtering and target detection. The front-end architecture is based on an FPGA implementation of a Kalman filter that predicts target locations in real time and removes the target signals from the incoming data prior to hybrid cancellation. The back-end is user configurable and exploits high performance GPU and multi-core parallel hardware to simultaneously compute multiple clutter suppression and target detection algorithms coupled to an intelligent selection strategy for selecting the most accurate result. These target locations are fed back to the FPGA Kalman filter periodically to update the target predictions.

关键词： Clutter Kalman filters Mathematical model Field programmable gate arrays Radar Clocks Algorithm design and analysis

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A reconfigurable arbitrary retarder array as complex structured matter

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Nature communications 2025年第1期16卷 4902页

作者： Chao He Binguo Chen Zipei Song Zimo Zhao Yifei Ma Honghui He Lin Luo Tade Marozsak An Aloysius Wang Rui Xu Peixiang Huang Jiawen Li Xuke Qiu Yunqi Zhang Bangshan Sun Jiahe Cui Yuxi Cai Yun Zhang Andong Wang Mohan Wang Patrick Salter Julian Aj Fells Ben Dai Shaoxiong Liu Limei Guo Yonghong He Hui Ma Daniel J Royston Steve J Elston Qiwen Zhan Chengwei Qiu Stephen M Morris Martin J Booth Andrew Forbes Department of Engineering Science University of Oxford Parks Road Oxford OX1 3PJ UK. chao.he@eng.ox.ac.uk. Institute of Biopharmaceutical and Health Engineering Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen 518055 China. Department of Engineering Science University of Oxford Parks Road Oxford OX1 3PJ UK. Institute of Biopharmaceutical and Health Engineering Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen 518055 China. he.honghui@***. College of Engineering Peking University Beijing 100871 China. luol@***. College of Engineering Peking University Beijing 100871 China. Key Laboratory of Archaeological Sciences and Cultural Heritage Chinese Academy of Social Sciences Beijing 102488 China. Department of Statistics The Chinese University of Hong Kong Shatin HK SAR China. Shenzhen Sixth People's Hospital Huazhong University of Science and Technology Union Shenzhen Hospital 518052 Shenzhen China. Department of Pathology School of Basic Medical Science Peking University Health Science Center Peking University Third Hospital Beijing China. Nuffield Division of Clinical Laboratory Sciences Radcliffe Department of Medicine University of Oxford Oxford UK. Department of Pathology Oxford University Hospitals NHS Foundation Trust Oxford UK. School of Optical‑Electrical and Computer Engineering University of Shanghai for Science and Technology Shanghai 200093 China. Department of Electrical and Computer Engineering National University of Singapore Singapore 117583 Singapore. School of Physics University of the Witwatersrand Private Bag 3 Johannesburg 2050 South Africa.

Tuneable retarder arrays, such as spatially patterned liquid crystal devices, have given rise to impressive photonic functionality, fuelling diverse applications ranging from microscopy and holography to encryption and communications. Presently these solutions are limited by the controllable degrees of freedom of structured matter, hindering applications that demand photonic systems with high flexibility and reconfigurable topologies. Here we demonstrate a compound modulator that implements a synthetic tuneable arbitrary retarder array as virtual pixels derived by cascading low functionality tuneable devices, realising full dynamic control of its arbitrary elliptical axis geometry, retardance value, and induced phase. Our approach offers unprecedented functionality that is user-defined and possesses high flexibility, allowing our modulator to act as a new beam generator, analyser, and corrector, opening an exciting path to tuneable topologies of light and matter.

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Development of a smartphone-based app for determination of formaldehyde concentration indoors 15

Development of a smartphone-based app for determination of f...

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15th Conference of the international Society of Indoor Air Quality and Climate, INDOOR AIR 2018

作者： Zhang, Siyang Shapiro, Nicholas Gehrke, Gretchen Castner, Jessica Liu, Zhenlei Guo, Beverly Zhang, Jianshun Haines, Sarah Kormos, David Frey, Paige Qin, Rongjun Dannemiller, Karen C. Department of Computer Science and Engineering Ohio State University United States Public Laboratory for Open Technology and Science Department of Mechanical and Aerospace Engineering Syracuse University Environmental Science Graduate Program Ohio State University United States Department of Civil Environmental and Geodetic Engineering College of Engineering Ohio State University United States Strand Associates Incorporated Department of Electrical and Computer Engineering Ohio State University United States Department of Environmental Health Sciences College of Public Health Ohio State University United States

ISBN: (纸本)9781713826514

Formaldehyde is a ubiquitous contaminant in the indoor environment that is both a carcinogen and irritant. The goal of this project is to develop a smartphone-based app for use by citizen scientists or researchers that can be paired with low-cost colorimetric badges for detection of indoor formaldehyde. We conducted both national and geographically-targeted surveys prior to app design. We have subsequently developed the app and conducted a beta test. Surveys of 147 individuals indicated broad public interest in formaldehyde testing using smartphone technology. Testing of the badges indicated consistent change in illumination with increasing formaldehyde exposure. Beta testing indicated users were able to navigate the existing app, and highlighted areas for improvement including incorporation of public surveys. Planned future analysis includes extensive calibration testing and a community-based field test. © 2018 15th Conference of the international Society of Indoor Air Quality and Climate, INDOOR AIR 2018. All rights reserved.

关键词： Formaldehyde

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Simulation for Image Traffic Sensor in Malaysia Traffic Dilemma Control Systems

Simulation for Image Traffic Sensor in Malaysia Traffic Dile...

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Asian Simulation Conference/The 6th international conference on system Simulation and Scientific Computing

作者： Nadiah Hanim Mohd Nazmi Sadao TAKABA Graduate Student Department of Computer Science Graduate School Tokyo University of Technology Lecturer Department of Electrical and Computer Engineering International Islamic University Malaysia Professor School of Computer Science Tokyo University of Technology

This paper focuses on the method used for traffic control system in dilemma-zone detection. Our research systems based on a general purpose of minimizing the probability for accident that resulted from signal phase termination especially at night. This objective is accomplished by using image detectors to monitor vehicle existence in the dilemma zone and then extending the phase until the dilemma zone is cleared or until a maximum green is reached. The systems described have additional objectives that are intended to provide other safety or operational benefits. Arena simulations are used to determine the existence of vehicle in the dilemma zone. Our main goal is to instruct drivers' decision while approaching the intersection by using the traffic signal control.

关键词： Dilemma Zone, Sensing Technology, System Control Online System and Simulation

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System dynamics of supply chain network organization structure

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Information Systems and e-Business Management 2004年第2期2卷 187-206页

作者： Zhang, Yong Dilts, David Management of Technology Program Vanderbilt University Electrical Engineering & Computer Science Department School of Engineering Nashville USA Owen Graduate School of Management Vanderbilt University Nashville USA

Information technology is providing manufacturers with additional flexibility with regard to their supply chain network choices. Our research studies supply chain network organization structures categorized by the organic and mechanistic management control structures. The structural impacts on cost and fill rate performance are studied in two-echelon and two-supply-chain network organization models under different market coordination conditions using system dynamic simulations. Our results show significant effects of demand and network structural factors, and their interactions, on these measures. As demand becomes dynamic, the cooperative interaction model, where supply chains cooperate to satisfy customer demand, is found to have better system performance than the competitive supply chain model. The analysis also suggests that increasing the responsiveness at the downstream plant is particularly important to the overall system performance improvement.

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Simulation and Evaluation for Decentralized Signal Control on Four Intersections in Malaysia Traffic Systems

Simulation and Evaluation for Decentralized Signal Control o...

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Asian Simulation Conference/The 6th international conference on system Simulation and Scientific Computing

作者： Mohd Nazmi Nadiah Hanim Sadao TAKABA Lecturer Department of Electrical and Computer Engineering International Islamic University Malaysia Graduate Student Department of Computer Science Graduate School Tokyo University of Technology Professor School of Computer Science Tokyo University of Technology

This research is to propose and develop the new signal control system which is to be integrated into Malaysia Traffic System. The control system obtains information from image detectors which are installed inside the intersection;predict the future traffic flows at various levels and conditions. A dynamic network system could capture the problem of the network traffic congestions, estimates the information on each particular link (neighboring intersection), in terms of vehicles flow and traffic can be calculated. Referring to the network flow control, the information data let the system to set the parameter itself then allow the system to allocate green time for each different demand pattern and each phase. These decisions are determined not at a central system but at the intersection control system. Simulation is done to find any difficulty of the system.

关键词： Decentralized Intersection, Signal Control System, Traffic Flows, Simulation System, Real-time Network

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Dilatometric study of ferroelectric Rb2CdI4 monoclinic crystal grown by czochralski method

Dilatometric study of ferroelectric Rb2CdI4 monoclinic cryst...

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12th international Meeting on Ferroelectricity, IMF-12 and the 18th IEEE international Symposium on Applications of Ferroelectrics, ISAF-18

作者： Yamaguchi, T. Gotou, S. Miyoshi, T. Kasano, H. Mitsui, T. Kurihama, T. Shimizu, F. Takashige, M. Department of Electrical Engineering School of Science and Engineering Meisei University Hino-shi Tokyo 191-8506 Japan Electrical Engineering Graduate School of Science and Engineering Meisei University Hino-shi Tokyo 191-8506 Japan Department of Physics Graduate School of Science and Engineering Yamaguchi University Yamaguchi-shi Yamaguchi 753-8512 Japan Laboratory of Developmental Program Faculty of Pharmaceutical Sciences Teikyo University Sagamihara-shi Kanagawa 229-0195 Japan Department of Electronics and Information Engineering College of Engineering Chubu University Kasugai-shi Aichi 487-8501 Japan Department of Electronics and Computer Science College of Science and Engineering Iwaki Meisei University Iwaki-shi Fukushima 970-8551 Japan

Crystal growth of Rb2CdI4 was performed by Czochralski method. Transparent colourless crystals with monoclinic structure were obtained. Temperature dependence of the dielectric constant along the b-axis was measured with variation of frequency. The thermal expansions x i (i = a, b, c and a′;a′ = a + c) along the four independent axes were measured both by clip-type strain-gauge dilatometer and X-ray diffraction methods. These results show distinct anomalies associated with the ferroelectric transition at TC= 210 K. Copyright © 2010 Taylor & Francis Group, LLC.

关键词： X ray diffraction

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