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IEEE International Conference on networking, Sensing and Control

作者： Michiel Houwing Rudy R. Negenborn Marija D. Ilic Bart De Schutter Electic Energy Systems Group of Carnegie Mellon University Pittsburgh PA USA Faculty of Technology Policy and Management Delft University of Technnology Delft Netherlands Delft Center of Systems and Control Delft University of Technnology Delft Netherlands Departments of Electrical and Computer Engineering and Engineering and Public Policy Carnegie Mellon University Pittsburgh PA USA Control of Future Electricity Network Operations Faculty of Technology Delft University of Technnology Delft Netherlands Marine and Transport Technology Department Delft University of Technnology Netherlands

With the increasing application of distributed energy resources and information technologies in the electricity infrastructure, innovative possibilities for incorporating the demand side more actively in power system operation are enabled. At the residential level energy costs could be reduced with intelligent price-based control concepts (demand response). A promising, controllable, residential distributed generation technology is micro cogeneration (micro-CHP). Micro-CHP is an energy efficient technology that simultaneously provides heat and electricity to households during operation. This paper presents a detailed model of a household using a proton exchange membrane fuel cell (PEMFC) micro-CHP system in conjunction with heat storage options to fulfil its heat and part of its electricity demand. Furthermore, a decentralised controller based on a model predictive control (MPC) strategy is proposed. MPC can take benefit of future knowledge on prizes and energy demands and can therefore lead to better system performance. In simulations the performance of the MPC-controlled PEMFC system is illustrated under different conditions regarding energy pricing, domestic energy demand, and system configuration.

关键词： Predictive models Predictive control Fuel cells Cogeneration Resistance heating Power system modeling Distributed control Energy resources Information technology Costs

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Gate-induced g-factor control and dimensional transition for donors in multivalley semiconductors

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Physical Review B 2009年第15期80卷 155301-155301页

作者： Rajib Rahman Seung H. Park Timothy B. Boykin Gerhard Klimeck Sven Rogge Lloyd C. L. Hollenberg Network for Computational Nanotechnology Purdue University West Lafayette Indiana 47907 USA Department of Electrical Engineering University of Alabama Huntsville Alabama 35899 USA Jet Propulsion Laboratory California Institute of Technology Pasadena California 91109 USA Kavli Institute of Nanoscience Delft University of Technology Lorentzweg 1 2628 CJ Delft The Netherlands Center for Quantum Computer Technology School of Physics University of Melbourne Victoria 3010 Australia

The dependence of the g factors of semiconductor donors on applied electric and magnetic fields is of immense importance in spin-based quantum computation and in semiconductor spintronics. The donor g-factor Stark shift is sensitive to the orientation of the electric and magnetic fields and is strongly influenced by the band-structure and spin-orbit interactions of the host. Using a multimillion atom tight-binding framework, the spin-orbit Stark parameters are computed for donors in multivalley semiconductors, silicon, and germanium. Comparison with limited experimental data shows good agreement for a donor in silicon. Results for gate-induced transition from three-dimensional to two-dimensional wave-function confinement show that the corresponding g-factor shift in Si is experimentally observable, and at modest B field, O(1 T) can exceed the Stark shift of the hyperfine interaction.

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A demonstration of video over a user centric prioritization scheme for wireless LANs

A demonstration of video over a user centric prioritization ...

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5th Annual IEEE Communications Society Conference on Sensor, Mesh and Ad Hoc Communications and networks, SECON 2008

作者： Choumas, Konstantinos Korakis, Thanasis Tassiulas, Leandros Department of Computer and Network Engineering University of Thessaly Volos 38221 Greece Department of Electrical and Computer Engineering Polytechnic University Brooklyn NY 10021 United States

ISBN: (纸本)9781424417773

Due to the unreliable nature of the wireless medium, provisioning of the Quality of Service (QoS) in wireless LANs is by far more complicated than in wired networks. In this demo we show the efficiency of a new QoS support scheme that is based on an user centric approach. The new mechanism takes under consideration the identification of the station that generates the traffic additionally to the traffic itself. Therefore, it uses a second prioritization level on the top of the one that is implemented in IEEE 802.11e. It first defines groups of stations based on their MAC addresses and it assigns different priorities to different groups. Under this classification, stations are served based on the prioritization of the group they belong. Among stations with same priority, traffic is scheduled based on the priorities given by 802.11e. The new scheme is implemented using open source drivers and 802.11g WiFi cards. In the demo, a video clip is streamed from a server to a client with high priority under heavy traffic load. The underlying wireless transport alternates between the classic IEEE 802.11e and the new prioritization scheme. The new scheme delivers a smooth and jitter-free user experience, while the video playout over IEEE 802.11e experiences noticeable jitter and frequent distortions. The demo clearly demonstrates the performance superiority of the new implemented scheme, as compared to the legacy IEEE 802.11e. © 2008 IEEE.

关键词： Quality of service

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A history based semantic aware access control model using logical time

A history based semantic aware access control model using lo...

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11th International Conference on computer and Information Technology, ICCIT 2008

作者： Ravari, Ali Noorollahi Amini, Morteza Jalili, Rasool Jafarian, Jafar Haadi Network Security Center Computer Engineering Department Sharif University Of Technology Tehran Iran

ISBN: (纸本)9781424421367

With the advent of semantic technology' access control cannot be done in a safe way unless the access decision takes into account the semantic relationships among the entities in a semantic-aware environment. The SBAC model (Semantic Based Access Control model) considers this issue in its decision making process. However' time plays a crucial role in new computing environments'which is not supported in SBAC. In this paper' we propose the Temporal Semantic Based Access Control (TSBAC) model' as an extension of SBAC' which enhances the specification of user-defined authorization rules by constraining time interval and temporal expression over users' history of accesses. TSBAC uses logical time' rather than to real time' in its authorization rules. A formal semantics for temporal authorizations is provided and conflicting situations (due to the semantic relations of the SBAC model and a sub-interval relation between authorizations) are investigated and resolved in our proposed model. An architecture for the access control system based on TSBAC is presented.©2008 IEEE.

关键词： Access control models

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A temporal semantic-based access control model

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13th International computer Society of Iran computer Conference on Advances in computer Science and engineering, CSICC 2008

作者： Noorollahi Ravari, Ali Amini, Morteza Jalili, Rasool Network Security Center Computer Engineering Department Sharif University of Technology Tehran Iran

ISBN: (纸本)3540899847

With the advent of semantic technology, access control cannot be done in a safe way unless the access decision takes into account the semantic relationships between entities in a semantic-aware environment. SBAC model considers this issue in the decision making process. However, time plays a crucial role in new computing environments which is not supported in this model. In this paper we introduce temporal semantic based access control model (TSBAC), as an extension of SBAC model, which enhances the specification of user-defined authorization rules by constraining time interval and temporal expression over users' history of accesses. A formal semantics for temporal authorizations is provided and conflicting situations (due to the semantic relations of the SBAC model and a sub-interval relation between authorizations) are investigated and resolved in our proposed model. © 2008 Springer-Verlag.

关键词： Semantics

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Designing a groupware with handheld devices for learning mathematics

Designing a groupware with handheld devices for learning mat...

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5th IEEE International Workshop on Wireless, Mobile and Ubiquitous Technologies in Education

作者： Tao, Shu-Yuan Ho, Kuang-Wen Chung, Chen-Wei Liu, Baw-Jhiune Liu, Chen-Chung Department of Computer Science and Engineering Yuan Ze University Taiwan Department of Information Management Chungyu Institute of Technology Taiwan Department of Computer Science and Information Engineering Central University Taiwan Graduate Institute of Network Learning Technology Central University Taiwan

ISBN: (纸本)9780769531083

This study proposed a groupware and a flow of learning activity to guide students in learning arithmetic word problem with handheld devices. Appropriating the concept of semi-situated learning which was aided by the 4-frame comic embedded into the PDA, this study expected the comic to play as a catalyst to trigger students in articulating some theme associated with the content of the 4-frame comic. The scenario and features of this groupware are presented in the paper and a preliminary study at an elementary school is also described and discussed.

关键词： Students

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Exemplar-based image inpainting base on structure construction

Journal of Software

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Journal of Software 2008年第8期3卷 57-64页

作者： Hung, Jason C. Hwang, Chun-Hong Liao, Yi-Chun Tang, Nick C. Chen, Ta-Jen Department of Information Technology The Overseas Chinese Institute of Technology Taichung Taiwan Department of Computer Information and Network Engeering Lunghwa University of Science and Technology Taoyuan County Taiwan Department of Computer Science and Information Engineering China University of Technology Hsinchu County Taiwan Department of Computer Science and Information Engineering Tamkang University Taipei County Taiwan

Image inpainting technique is that repairs damaged area or remove areas in an image. In order to deal with this kind of problems, not only a robust image inpainting algorithm should be used, technique of structure generation is also needs to adopt in inpainting procedure. In this paper, we extend an exemplar-based image inpainting method by incorporating Bézier curves to construct missing edge information. Before we apply our inpainting procedure to a damaged image, mean shift segmentation is used to extract contours of each region. After the structure information of an image is determined, destroyed contours will be connected in curve fitting process and damaged regions will be inpainted by using exemplar-based inpainting method. The experimental results show that our proposed method could deal with several kinds of pictures well. © 2008 ACADEMY PUBLISHER.

关键词： Curve fitting

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Distributed and adaptive framework for provisioning QoS in IPv6 networks

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Journal of Shanghai Jiaotong University (Science) 2008年第1期13 E卷 97-101页

作者： Shao, Hua-Gang Chen, Xiao Wang, Wei-Nong Department of Computer Science and Engineering Shanghai Jiaotong University Shanghai 200240 China Network Center Shanghai Jiaotong University Shanghai 200030 China

A distributed and adaptive framework (DAF) was proposed for provisioning quality of service (QoS) in IPv6 network. In DAF, per-flow admission control and resource reservation, in conjunction with a new IPv6 flow label mechanism, can be performed instantaneously in a fully distributed and independent fashion at the edge of network without hop-by-hop signaling. The flow label helps in resource reservation and packets forwarding for aggregated traffic on an edge-to-edge path basis. In addition, a bounded directional probing technique for DAF was designed to reconfigure resource reservation adaptively between every pair of edge router for aggregated traffic according to the fluctuation of its traffic load. The simulation results show that DAF provides QoS guarantees to individual flows with minimal overhead, as well as keeping the scalability characteristic like DiffServ.

关键词： Internet protocols

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Rotation-invariant iris recognition -: Boosting 1D spatial-domain signatures to 2D

Rotation-invariant iris recognition -: Boosting 1D spatial-d...

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5th International Conference on Informatics in Control, Automation and Robotics

作者： Matschitsch, Stefan Stoegner, Herbert Tschinder, Martin Uhl, Andreas School of Telematics and Network Engineering Carinthia Tech Institute Austria Department of Computer Sciences University of Salzburg Austria

ISBN: (纸本)9789898111326

An iris recognition algorithm based on 1D spatial domain signatures is improved by extending template data from mean vectors to 2D histogram information. EER and shape of the FAR curve is clearly improved as compared to the original algorithm, while rotation invariance and the low computational demand is maintained. The employment of the proposed scheme remains limited to the similarity ranking scenario due to its overall FAR/FRR behaviour.

关键词： biometric authentication iris recognition rotation invariance

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Green supercomputing comes of age

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IT Professional 2008年第1期10卷 17-23页

作者： Feng, Wu-Chun Feng, Xizhou Ge, Rong Department of Computer Science and Electrical and Computer Engineering Virginia Tech. Network Dynamics and Simulation Science Laboratory Virginia Tech. Center for High-End Computing Systems Virginia Tech.

Energy-efficient (green) supercomputing has evolved to improve system reliability and provide better availability and productivity. Green Destiny supercomputing system is a Linux-based cluster that uses low-power components whose performance could be optimized for supercomputing. Low-power supercomputing focuses on energy efficiency at system integration time, selects low-power chips as the building blocks for power reduction and system reliability, and achieves better performance by scaling up to a larger number of processors. Researchers have implemented various power-aware software prototypes for commodity supercomputing starting with cluster of high-performance, high-power processors that support mechanism called dynamic voltage and frequency scaling (DVFS). Various approaches for parallel supercomputing nodes are studied by aiming execution phases that are not on the critical execution path.

关键词： Supercomputers

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