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International Journal of Interactive Mobile Technologies 2012年第1期6卷 25-32页

作者： Setyono, A. Alam, M.J. Eswaran, C. Faculty of Information technology Multimedia University Cyberjaya Malaysia Faculty of Computer Science Dian Nuswantoro University Semarang Indonesia Faculty of Information Technology Center for Multimedia Computing Multimedia University Cyberjaya Malaysia Department of electrical engineering Indian Institute of Technology Madras India

Limitation of message size of the MMS technology is one of the important factors which make this technology less attractive. This limitation restricts the system developers in developing new mobile applications using MMS technology. This research attempts to improve the capacity of the maximum message size by implementing compression, splitting and cropping techniques for MMS application on the mobile phone devices. This paper presents the architecture to enhance the multimedia capabilities of the MMS technology and also the implementation details for developing client-server system applications. The modified MMS technology can be used to develop practical client-server applications. © 2012, International Federation of engineering Education Societies (IFEES). All rights reserved.

关键词： Cost effectiveness

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A pipeline for the Simulation of Transcranial Direct Current Stimulation for Realistic Human Head Models using SCIRun/BioMesh3D

A pipeline for the Simulation of Transcranial Direct Current...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society

作者： Moritz Dannhauer Dana Brooks Don Tucker Rob MacLeod is with Scientific Computing and Imaging Institute 72 So. Central Campus Drive Salt Lake City Utah 84112 USA Department of Electrical and Computer Engineering 409 Dana Center 360 Huntington Avenue Boston MA 02115 USA Department of Psychology Clinical Cognitive Neuroscience University of Oregon

ISBN: (纸本)9781424441198

The current work presents a computational pipeline to simulate transcranial direct current stimulation from image based models of the head with SCIRun [15]. The pipeline contains all the steps necessary to carry out the simulations and is supported by a complete suite of open source software tools: image visualization, segmentation, mesh generation, tDCS electrode generation and efficient tDCS forward simulation.

关键词： the Simulation SCIRun/BioMesh3D segmentation

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Photonic crystals in proton-exchanged LiNbO3 waveguides for photonic applications

Photonic crystals in proton-exchanged LiNbO3 waveguides for ...

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IEEE PhotonicsGlobal@Singapore, IPGC

作者： Deng Jun Jia Wei Vanga Sudheer Kumar Ching Eng Png Andrew A. Bettiol Aaron J. Danner Institute of High Performance Computing Agency for Science Technology and Research (ASTAR) Singapore Department of Electrical and Computer Engineering National University of Singapore Singapore Henan Key Laboratory of Laser and O pto-electric Information Technology Zhengzhou University Henan China Department of Physics National University of Singapore Singapore

Photonic crystals realized in LiNbO 3 have a great potential to reduce the size and increase the functionality of integrated optical devices. In order to accomplish these aims, fabrication know-how must be mastered yet it remains relatively uncharted. In this work we report the fabrication and optical characterization of photonic crystal structures in annealed proton exchanged (APE) LiNbO 3 waveguides. In our work, channel waveguides were fabricated by photolithography patterning followed by immersing LiNbO 3 wafers in molten benzoic acid at 235°C for 5 h. The thickness and the composition profiles of the APE waveguides were measured using the secondary ion mass spectroscopy (SIMS) method. The experimental characterization of the photonic crystal waveguides was performed and a photonic stop band with good sharpness can be observed from the transmission spectra.

关键词： Photonics Optical fibers Optical device fabrication Optical imaging Optical polarization

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Maximally permissive control of flexible manufacturing systems with fewest disjunctive constraints

Maximally permissive control of flexible manufacturing syste...

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International Conference on Advanced Mechatronic Systems (ICAMechS)

作者： YuFeng Chen MengChu Zhou XiaoOu Li School of Electro-Mechanical Engineering Xidian University Xi'an China Key Laboratory of Embedded System and Service Computing Ministry of Education University of Tongji Shanghai China Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA Departamento de Computacion CINVESTAVIPN Mexico Distrito Federal Mexico

For Petri net models whose legal reachability spaces are non-convex, one cannot optimally control them by the conjunctions of linear constraints. This work proposes a method to find a set of linear constraints such that each constraint can forbid all first-met bad markings and every legal marking satisfies at least one constraint. Then, the disjunctions of the obtained constraints can make all legal markings reachable and forbid all first-met bad markings, i.e., the controlled net is live and maximally permissive. The work also develops an integer linear programming model to minimize the number of the constraints. Finally, an example is provided to illustrate the proposed method.

关键词： Law Optimal control Vectors Aerospace electronics Petri nets System recovery

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Lasing in Thue-Morse structure with optimal aperiodicity

Lasing in Thue-Morse structure with optimal aperiodicity

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Conference on Lasers and Electro-Optics

作者： Jin-Kyu Yang Heeso Noh Svetlana V. Boriskina Michael J. Rooks Glenn S. Solomon Luca Dal Negro Hui Cao Department of Applied Physics Yale University Department of Electrical and Computer Engineering and Photonics Center Boston University Joint Quantum Institute NIST and University of Maryland

We demonstrated lasing in two-dimensional Thue-Morse structures fabricated in InAs quantum dots embedded GaAs membrane. We optimized structural aperiodicity by gradually changing the relative size of two scatters for ... 详细信息

ISBN: (纸本)9781467318396

关键词： Semiconductor laser Photonic crystal

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Phase encoding schemes for measurement-device-independent quantum key distribution with basis-dependent flaw

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Physical Review A 2012年第4期85卷 042307-042307页

作者： Kiyoshi Tamaki Hoi-Kwong Lo Chi-Hang Fred Fung Bing Qi NTT Basic Research Laboratories NTT Corporation 3-1 Morinosato Wakamiya Atsugi-Shi Kanagawa 243-0198 Japan National Institute of Information and Communications Technology 4-2-1 Nukui-Kita Koganei Tokyo 184-8795 Japan Center for Quantum Information and Quantum Control Department of Electrical & Computer Engineering and Department of Physics University of Toronto Toronto Ontario M5S 3G4 Canada Department of Physics and Center of Computational and Theoretical Physics University of Hong Kong Pokfulam Road Hong Kong

In this paper, we study the unconditional security of the so-called measurement-device-independent quantum key distribution (MDIQKD) with the basis-dependent flaw in the context of phase encoding schemes. We propose two schemes for the phase encoding: The first one employs a phase locking technique with the use of non-phase-randomized coherent pulses, and the second one uses conversion of standard Bennett-Brassard 1984 (BB84) phase encoding pulses into polarization modes. We prove the unconditional security of these schemes and we also simulate the key generation rate based on simple device models that accommodate imperfections. Our simulation results show the feasibility of these schemes with current technologies and highlight the importance of the state preparation with good fidelity between the density matrices in the two bases. Since the basis-dependent flaw is a problem not only for MDIQKD but also for standard quantum key distribution (QKD), our work highlights the importance of an accurate signal source in practical QKD systems.

关键词： quantum cryptography

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Spectroscopy of low-frequency noise and its temperature dependence in a superconducting qubit

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Physical Review B 2012年第17期85卷 174521-174521页

作者： Fei Yan Jonas Bylander Simon Gustavsson Fumiki Yoshihara Khalil Harrabi David G. Cory Terry P. Orlando Yasunobu Nakamura Jaw-Shen Tsai William D. Oliver Department of Nuclear Science and Engineering Massachusetts Institute of Technology (MIT) Cambridge Massachusetts 02139 USA Research Laboratory of Electronics MIT Cambridge Massachusetts 02139 USA Institute of Physical and Chemical Research (RIKEN) Wako Saitama 351-0198 Japan Institute for Quantum Computing and Department of Chemistry University of Waterloo Ontario Canada N2L 3G1 Perimeter Institute for Theoretical Physics Waterloo Ontario Canada N2J 2W9 Department of Electrical Engineering and Computer Science MIT Cambridge Massachusetts 02139 USA Green Innovation Research Laboratories NEC Corporation Tsukuba Ibaraki 305-8501 Japan MIT Lincoln Laboratory 244 Wood Street Lexington Massachusetts 02420 USA

We report a direct measurement of the low-frequency noise spectrum in a superconducting flux qubit. Our method uses the noise sensitivity of a free-induction Ramsey interference experiment, comprising free evolution in the presence of noise for a fixed period of time followed by single-shot qubit-state measurement. Repeating this procedure enables Fourier-transform noise spectroscopy with access to frequencies up to the achievable repetition rate, a regime relevant to dephasing in ensemble-averaged time-domain measurements such as Ramsey interferometry. Rotating the qubit's quantization axis allows us to measure two types of noise: effective flux noise and effective critical-current or charge noise. For both noise sources, we observe that the very same 1/f-type power laws measured at considerably higher frequencies (0.2−20 MHz) are consistent with the noise in the 0.01−100-Hz range measured here. We find no evidence of temperature dependence of the noises over 65−200 mK, and also no evidence of time-domain correlations between the two noises. These methods and results are pertinent to the dephasing of all superconducting qubits.

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Using Data-Level Parallelism to Accelerate Instruction -Level Redundancy

Using Data-Level Parallelism to Accelerate Instruction -Leve...

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World Automation Congress

作者： Yu Hu Zhong liang Chen Xiaowei Li Key Laboratory of Computer System and Architecture Institute of Computing Technology CAS Beijing 100190 China Department of Electrical and Computer Engineering Northeastern University Boston MA 02115 USA

ISBN: (纸本)9781467344975

Instruction-level redundancy is an effective scheme to reduce the susceptibility of microprocessors to soft errors, offering high error detection and recovery capability;however, it usually incurs significant performance degradation due to resource racing. Motivated by the fact that narrow-width operands are commonly seen in applications, we exploit data-level parallelism to accelerate instruction-level redundancy. For the instructions within sphere of replication (SoR) of data-level redundancy, normal and redundant versions of the narrow-width operand of the instruction are folded into one register to share the same functional unit during execution hence alleviating resource racing. The other instructions are all protected by instructionlevel redundancy. We run SPECint2000 benchmarks on a modified version of SimpleScalar simulator, and synthesize the extra hardware to evaluate area overhead of the proposed pipeline. Experimental results show that our acceleration scheme outperforms conventional instruction-level redundancy by 13% in IPC. Besides, the extra area overhead is negligible.

关键词： Keywords Data-level redundancy Instruction-level redundancy Narrow-width value Sphere of replication

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Decoding Hand Trajectories from Micro-Electrocorticography in Human Patients

Decoding Hand Trajectories from Micro-Electrocorticography i...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society

作者： Spencer Kellis Sara Hanrahan Tyler Davis Paul A. House Richard Brown Bradley Greger Division of Biology California Institute of Biology Pasadena CA 91125 USA Dept. of Bioengineering University of Utah Salt Lake City UT 84112 USA Department of Neurosurgery University of Utah Salt Lake City UT 84132 USA Department of Electrical and Computer Engineering the School of Computing and the Department of Bioengineering University of Utah Salt Lake City UT 84112 USA

ISBN: (纸本)9781424441198

A Kalman filter was used to decode hand trajectories from micro-electrocorticography recorded over motor cortex in human patients. In two cases, signals were recorded during stereotyped tasks, and the trajectories were decoded offline, with maximum correlation coefficients between actual and predicted trajectories of 0.51 (x-direction position) and 0.54 (y-direction position). In a third setting, a human patient with full neural control of a computer cursor acquired onscreen targets within 6.24 sec on average, with no algorithmic constraints on the output trajectory. These practical results illustrate the potential utility of signals recorded at the cortical surface with high spatial resolution, demonstrating that surface potentials contain relevant and sufficient information to drive sophisticated brain-computer interface systems.

关键词： micro-electrocorticography stereotyped tasks output trajectory

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Selective coupling of quantum dot exciton spin states to a photonic crystal cavity using magnetic field tuning

Selective coupling of quantum dot exciton spin states to a p...

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2011 International Semiconductor Device Research Symposium, ISDRS 2011

作者： Kim, Hyochul Shen, Thomas C. Sridharan, Deepak Solomon, Glenn Waks, Edo Department of Electrical and Computer Engineering IREAP and Joint Quantum Institute University of Maryland College Park United States Joint Quantum Institute National Institute of Standards and Technology United States

ISBN: (纸本)9781457717550

Semiconductor quantum dots (QDs) coupled to high quality optical microcavities provide essential components for solid state cavity quantum electrodynamics systems. Indium Arsenide (InAs) QDs are one of the most promising candidates for quantum emitters due to their discrete density of states and high oscillator strength. When they are combined with small mode volume and high quality microcavities, strong light-matter interaction can be observed. Application of a magnetic field to QDs is necessary for several quantum information applications which require multi-level emitter structures [1-2]. Magnetic field lifts the degeneracy of QD exciton spin states due to the Zeeman effect, providing access to the individual QD spin states. In addition, a magnetic field can be useful as a method to tune QD emission frequency, which can be used to control the interaction between quantum emitters and an optical cavity [3-5]. We apply a magnetic field to photonic crystal cavity devices with embedded InAs QDs, and demonstrate strong coupling between individual QD exciton spin states and a photonic crystal cavity. © 2011 IEEE.

关键词： Indium arsenide

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