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International Workshop on technology for Education, T4E

作者： Rwitajit Majumdar Sridhar Iyer Inter-Disciplinary Program in Educational Technology Indian Institute of Technology Bombay Department of Computer Science and Engineering Indian Institute of Technology Bombay

Muddy Points (MP) is a strategy to elicit and address individual students' doubts. While this can be effectively implemented in small classes, it is a challenge to do so in a large class. In this paper we propose LAMP, a framework for Large-scale Addressing of Muddy Points, as a mechanism for instructors to ensure that every individual student's doubts are addressed even in large classes. LAMP has three phases: Collection, Addressal, and Closure. In the collection phase, MPs are systematically collected through four different modes. In the addressal phase, MPs are categorized into six categories and addressed accordingly. In the closure phase, the discussions on MPs are summarized. We investigated the effectiveness of LAMP in an introductory computer science course having 450 students. We found that 68% of students confirmed they were able to pose their questions and 57% of students confirmed that there was closure to their questions.

关键词： Systematics computer science Education Message systems Multicore processing Physics

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Guidelines and Templates for Planning, Conducting and Reporting Educational technology Research

Guidelines and Templates for Planning, Conducting and Report...

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International Workshop on technology for Education, T4E

作者： Sridhar Iyer Sahana Murthy Inter-Disciplinary Program in Educational Technology Indian Institute of Technology Bombay Department of Computer Science and Engineering Indian Institute of Technology Bombay

Educational technology (ET) research encompasses a wide range of areas, including the development of technology tools for learning and teaching, pedagogies for technology enhanced learning, and use of ICT-based materials or tools for learning. The interdisciplinary nature of ET leads to a wide variation in the focus and quality of research articles. Hence there is a need for guidelines for planning, conducting and reporting ET research studies. Such guidelines are also useful to instructors, as they are often well-positioned to carry out applied ET research studies. This article is a mini-tutorial that provides guidelines and templates to conduct ET research studies. The emphasis of this tutorial is on criteria that reviewers use to evaluate research papers and how the criteria can be met. This tutorial is designed to be used with an accompanying set of templates that we have created. The templates offer scaffolds to the researcher during various stages of research, so that reviewers. criteria are effectively addressed.

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Compressive phase space tomography

Compressive phase space tomography

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Frontiers in Optics, FIO 2013

作者： Barbastathis, George Tian, Lei Petruccelli, Jonathan C. Zhang, Zhengyun Rehman, Shakil Lee, Justin W. Pan, Adam Department of Mechanical Engineering Massachusetts Institute of Technology Cambridge MA United States Singapore-MIT Alliance for Research and Technology Centre Massachusetts Institute of Technology Singapore UM-SJTU Joint Institute Shanghai Jiaotong University Shanghai China Department of Electrical Engineering and Computer Science University of California at Berkeley Berkeley CA United States Department of Physics State University of New York at Albany Albany NY United States Program in health Sciences and Technology Massachusetts Institute of Technology Cambridge MA United States

We present compressive sensing techniques to overcome the challenge of sampling the fourdimensional (4D) mutual intensity function, thus recovering complete information about the second-order statistical properties of... 详细信息

ISBN: (纸本)9781557529879

关键词： Compressed sensing

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Optimization of a z-source DC circuit breaker

Optimization of a z-source DC circuit breaker

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2013 5th IEEE Electric Ship Technologies Symposium, ESTS 2013

作者： Prempraneerach, P. Angle, M.G. Kirtley Jr., J.L. Karniadakis, G.E. Chryssostomidis, C. Mechanical Engineering Department Rajamangala University of Technology Thunyaburi Pathumthani 12110 Thailand Electrical Engineering and Computer Science Department Research Laboratory for Electronics MIT Cambridge MA 02139 United States Division of Applied Mathematics Brown University Providence RI 02912 United States MIT Sea Grant College Program Department of Mechanical Engineering MIT Cambridge MA 02138 United States

ISBN: (纸本)9781467352437

DC faults may cause severe disruptions in continuity of service to vital loads in a shipboard integrated power system, hence detection, isolation, and protection against such faults must be incorporated in both medium-voltage DC (MVDC) and low-voltage DC (LVDC) systems. Here we consider the effectiveness of existing z-source breakers and propose several new designs more appropriate for fault detection in MVDC and LVDC systems. In particular, we perform an optimization study that aims to minimize dissipation and weight and we identify the key parameters for use in MVDC and LVDC systems. Preliminary verification and validation studies are also included. © 2013 IEEE.

关键词： Electric circuit breakers

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Low-power signal processing methodologies for implantable biosensing platforms

Low-power signal processing methodologies for implantable bi...

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2013 IEEE Signal Processing in Medicine and Biology Symposium, SPMB 2013

作者： Croce Jr., Robert A. Vaddiraju, Santhisagar Legassey, Allen Islam, Syed K. Papadimitrakopoulos, Fotios Jain, Faquir C. IBiorasis Inc. Technology Incubation Program Storrs CT 06269 United States Dept. of Chemistry Institute of Materials Science University of Connecticut Storrs CT 06269 United States Department of Electrical and Computer Engineering University of Connecticut Storrs CT 06269 United States Analog VLSI and Devices Laboratory Department of Electrical Engineering and Computer Science University of Tennessee Knoxville TN 37996 United States

ISBN: (纸本)9781479930074

This paper presents the design and implementation of highly-miniaturized, low-power CMOS signal conditioning schemes intended for use in a totally implantable biomedical sensor platform. Due to the thrust for the development implantable biomedical sensing systems for health management and disease prevention, there exists a need for signal processing schemes which occupy very little on-chip real estate and consume negligible amounts of power. In light of this, this paper presents both a CMOS current-to-frequency converter and voltage-tofrequency converter which have been designed primarily for use in implantable biosensing platforms and applications. Such designs can be implemented in stand-alone single sensor designs, or in tandem to create multi-analyte architectures. The versatility of employing current-to-frequency as well as voltageto- frequency signal transduction schemes presents an avenue for the integration with any electrochemical sensing element which has been fabricated in an amperometric or voltammetric fashion. Furthermore, we demonstrate the efficacy of both these circuit designs by integrating them together with high performance electrochemical implantable glucose and pH sensors. The low power consumption and miniature size of the amperometric and voltammetric signal processing units (0.25 mm2 and 18 IlW / 0.045 mm2 and 122 IlW, respectively) presents an ideal design for signal processing in implantable continuous metabolic monitoring devices.

关键词： Signal processing

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Optics: Large-Field-of-View Wide-Spectrum Artificial Reflecting Superposition Compound Eyes (Small 15/2014)

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Small 2014年第15期10卷

作者： Chi-Chieh Huang Xiudong Wu Hewei Liu Bader Aldalali John A. Rogers Hongrui Jiang Department of Electrical and Computer Engineering University of Wisconsin – Madison Madison WI 53706 USA Department of Materials Science and Engineering Beckman Institute for Advanced Science and Technology and Frederick Seitz Materials Research Laboratory University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA Department of Electrical and Computer Engineering McPherson Eye Research Institute Materials Science Program Department of Biomedical Engineering University of Wisconsin – Madison Madison WI 53706 USA

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Implementation of Rössler chaotic system through inherent exponential nonlinearity of a diode with two-channel chaotic synchronization applications

Implementation of Rössler chaotic system through inherent e...

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International Conference on Intelligent Control and Information Processing (ICICIP)

作者： S. Larptwee W. San-Um Engineering Program and Basic Science Department Faculty of Engineering Thai-Nichi Institute of Technology Thailand Intelligent Electronic Systems Research laboratory and Computer Engineering Department Faculty of Engineering Thai-Nichi Institute of Technology Bangkok Thailand

ISBN: (纸本)9781467362481

This paper presents a new Rössler chaotic system using exponential nonlinearity and its application to two-channel synchronization. The proposed chaotic system exhibits a chaotic attractor that resembles the original Rössler system with only six-term in three-dimensional ordinary equation systems using the exponential nonlinearity. Chaotic dynamics are described in terms of equilibria, Jacobian matrix, time domain waveforms, chaotic attractors, and bifurcation diagram. The circuit implementation is relatively compact and simple sine the exponential nonlinearity can be achieved by an inherent nonlinearity of single diode. An application to a two-channel secure communication are also demonstrated, showing a fast, low-error and robust synchronization processes.

关键词： Chaotic communication Synchronization Equations Transmitters Receivers Mathematical model

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Periodic dynamics, localization metastability, and elastic interaction of colloidal particles with confining surfaces and helicoidal structure of cholesteric liquid crystals

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Physical Review E 2014年第6期90卷 062502-062502页

作者： Michael C. M. Varney Qiaoxuan Zhang Mykola Tasinkevych Nuno M. Silvestre Kris A. Bertness Ivan I. Smalyukh Department of Physics University of Colorado at Boulder Boulder Colorado 80309 USA Materials Science and Engineering Program University of Colorado at Boulder Boulder Colorado 80309 USA Max-Planck-Institut für Intelligente Systeme D-70569 Stuttgart Germany Institut für Theoretische Physik IV Universität Stuttgart D-70569 Stuttgart Germany Centro de Física Teórica e Computacional and Faculdade de Ciências da Universidade de Lisboa Av. Prof. Gama Pinto 2 1649-003 Lisboa Portugal National Institute of Standards and Technology Boulder Colorado 80305 USA Department of Electrical Computer and Energy Engineering and Liquid Crystals Materials Research Center University of Colorado at Boulder Boulder Colorado 80309 USA Renewable and Sustainable Energy Institute National Renewable Energy Laboratory and University of Colorado at Boulder Boulder Colorado 80309 USA

Nematic and cholesteric liquid crystals are three-dimensional fluids that possess long-range orientational ordering and can support both topological defects and chiral superstructures. Implications of this ordering remain unexplored even for simple dynamic processes such as the ones found in so-called “fall experiments,” or motion of a spherical inclusion under the effects of gravity. Here we show that elastic and surface anchoring interactions prompt periodic dynamics of colloidal microparticles in confined cholesterics when gravity acts along the helical axis. We explore elastic interactions between colloidal microparticles and confining surfaces as well as with an aligned ground-state helical structure of cholesterics for different sizes of spheres relative to the cholesteric pitch, demonstrating unexpected departures from Stokes-like behavior at very low Reynolds numbers. We characterize metastable localization of microspheres under the effects of elastic and surface anchoring periodic potential landscapes seen by moving spheres, demonstrating the important roles played by anchoring memory, confinement, and topological defect transformation. These experimental findings are consistent with the results of numerical modeling performed through minimizing the total free energy due to colloidal inclusions at different locations along the helical axis and with respect to the confining substrates. A potential application emerging from this work is colloidal sorting based on particle shapes and sizes.

关键词： Cholesteric liquid crystals

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Modeling nanorobot control for blood vessel repair: A non-Newtonian blood model

Modeling nanorobot control for blood vessel repair: A non-Ne...

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Biomedical engineering International Conference (BMEiCON)

作者： Supatchaya Trihirun Tiranee Achalakul Boonserm Kaewkamnerdpong Department of Computer Engineering King Mongkut's University of Technology Thonburi Bangkok Thailand Biological Engineering Program King Mongkut's University of Technology Thonburi Bangkok Thailand

Using nanorobots for medical diagnostics and treatment has been an intriguing idea since the concept of nanotechnology was introduced. This study investigated the control mechanism for locomotion of nanorobots in blood vessel repair application. Each nanorobot operating as artificial platelets has only essential characteristics for self-assembling into a mass at the injured blood vessel wall to reduce blood loss. This follows the idea of the early stage nanorobots that could be realized in the near future based on examples seen in biological systems and current development in nanotechnology. Canonical Particle Swarm Optimization (PSO) that are inspired by social insects was employed for controlling the nanorobots as they are similar in the way that individuals have simple characteristics but can robustly work in dynamic environment. In simulation, this study used Herschel-Bulkley fluid model to simulate non-Newtonian blood flow in a rigid tube. The performance of canonical PSO-based control mechanism was demonstrated and investigated to provide guidelines for the realization of nanorobots in the future.

关键词： Fluids Blood Nanobioscience Stress Wounds Blood flow

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Branched Nanowire Heterostructures for Efficient and Durable Solar-Driven Hydrogen Production

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ECS Meeting Abstracts 2014年第17期MA2014-01卷

作者： Alireza Kargar Sung Joo Kim Chulmin Choi Paniz Allameh Huisu Jeong Gun Young Jung Sungho Jin Xiaoqing Pan Deli Wang University of California - San Diego Department of Materials Science and Engineering University of Michigan Ann Arbor Materials Science and Engineering Program University of California-San Diego Department of Electrical and Computer Engineering University of California-San Diego School of Materials Science and Engineering Gwangju Institute of Science and Technology Qualcomm Institute (QI) University of California-San Diego

Branched nanowire (NW) heterostructures have recently been attracted considerable attention for solar water splitting and clean hydrogen production due to their unique properties such as nanoscale integration of different functional materials, greatly enhanced junction and surface area, enhanced gas evolution efficiency, broadband light absorption, etc. Moreover, branched NWs can be fabricated using facile and scalable fabrication methods such as hydrothermal or solvothermal growth methods. In this presentation, we show branched NWs of different compositions for core (or trunk) and branch NWs which were fabricated with facile and low-cost synthesis methods using cheap, non-toxic, and earth abundant materials including Si, CuO, Cu2O, ZnO, TiO2, and Fe2O3. The branched NW structures and the heterostructures' interfaces are investigated in detail using different characterization techniques such as SEM/HRSEM, TEM/HRTEM, STEM/HRSETM, etc. The photoelectrochemical (PEC) performances including photocurrent turn-on potential, photocurrent, solar conversion efficiency, and incident photon-to-current efficiency (IPCE) are studied systematically and optimized, based on different core and branch NW dimensions, for each specific branched NW heterostructure to provide efficient water splitting in a neutral medium. The electrode stability of different branched NWs is also investigated and long-term stability of over one day or several hours using a thin passivation layer or robust branched NWs are presented. The achieved results pave the way for accomplishing spontaneous overall solar water splitting for clean, efficient, cost-effective and durable solar hydrogen generation at large scales.

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