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IEEE EMBS International Conference on Information Technology Applications in Biomedicine (ITAB)

作者： M. Cerny M. Penhaker Biomedical Engineering Laboratory Faculty of Electrical Engineering and Computer Science Department of Measurement and Control Technical University of Ostrava Ostrava Czech Republic Department of Measurement and Control Vice director Biomedical Engineering Laboratory Director Faculty of Electrical Engineering and Computer Science Technical University of Ostrava Ostrava Czech Republic

The HomeCare is a special monitoring system of the basic life functions. It has been primarily designed to take care for elderly people. But many of the designed devices could be used in the other branches of biotelemetry. Our HomeCare system is designed with respect to user comfort and it uses as cheap technical solutions as possible. In cooperation with the Ostrava University a Homecare Testing Flat has been realized. There are tested our Homecare solutions in vivo. This article is focused on the designed HomeCare system, on measured parameters and on used wireless technologies. The Circadian rhythm measurement and its usage in the HomeCare system are discussed in the article too.

关键词： Circadian rhythm Biomedical measurements Electrocardiography Biomedical engineering Laboratories Biomedical monitoring computer science Blood Testing Medical control systems

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Using process control to increase the energy efficiency of mineral and metal processing plants

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International Journal of Power and Energy Systems 2008年第2期28卷 146-151页

作者： Desbiens, A. Núñez, E. Del Villar, R. Hodouin, D. Poulin, É. Department of Electrical and Computer Engineering Pavillon Pouliot Québec City QC G1V 0A6 Canada Process Control Group Xstrata Process Support Centre P.O. Box 40 Falconbridge ON P0M 1S0 Canada Department of Mining Metallurgical and Materials Engineering Pavillon Pouliot Québec City QC G1V 0A6 Canada

Because of globalization and international competition, mineral processing plant managers seek at reducing production costs. These plants are major energy consumers and therefore energy efficiency is becoming an important objective. Other incentives are the energy cost that will probably continue to rise and the environmental and social pressures for reducing energy consumption. Using more energy efficient equipment is a first approach. Better plant operation using on-line data processing, as described in this paper, is another way to improve energy efficiency. On-line data processing consists in using the measurements provided by sensors and the knowledge of the plant behaviour to automatically, continuously and adequately manipulate plant actuators. An ideal on-line data processing is made up of three hierarchic layers: process observation, process control and process optimization. The layers, their interaction and their energetic benefits are described. Some case studies illustrate the energy efficiency improvements provided to mineral processing plants by using on-line data processing techniques.

关键词： Process control

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An error-locating signature analyzer to identify faulty units in digital systems

An error-locating signature analyzer to identify faulty unit...

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Canadian Conference on electrical and computer engineering (CCECE)

作者： Vadim Geurkov Vladimir Dynkin Reza Sedaghat Electrical and Computer Engineering Department Ryerson University Toronto Canada Department of System Identification Institute for Control Science Moscow Russia

In conventional signature analysis, faulty units are identified by mismatch between the actual and reference signatures. The amount of reference signatures can be quite large for a complex system that requires high testing resolution. This complicates the diagnosis procedure. We show how under certain restrictions this amount can be reduced, preserving the diagnosis resolution and the aliasing rate. We construct a signature analyzer that is capable of locating faulty units. If the analyzer is implemented in the external automated test equipment, its throughput requirements can be diminished.

关键词： Error analysis Fault diagnosis Digital systems Circuit faults System testing Hardware computer errors Error correction Redundancy Fault detection

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Convex relaxation approach to the identification of the Wiener-Hammerstein model

Convex relaxation approach to the identification of the Wien...

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IEEE Conference on Decision and control

作者： Kin Cheong Sou Alexandre Megretski Luca Daniel Department of Automatic Control Lund Institute of Technology Sweden Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology USA

ISBN: (纸本)9781424431236

In this paper, an input/output system identification technique for the Wiener-Hammerstein model and its feedback extension is proposed. In the proposed framework, the identification of the nonlinearity is non-parametric. The identification problem can be formulated as a non-convex quadratic program (QP). A convex semidefinite programming (SDP) relaxation is then formulated and solved to obtain a sub-optimal solution to the original non-convex QP. The convex relaxation turns out to be tight in most cases. Combined with the use of local search, high quality solutions to the Wiener-Hammerstein identification can frequently be found. As an application example, randomly generated Wiener-Hammerstein models are identified.

关键词： System identification Quadratic programming Output feedback Power system modeling Piecewise linear techniques Polynomials Gaussian noise Least squares approximation Maximum likelihood estimation Noise measurement

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Excess Noise control in Gaussian-modulated Coherent State Quantum Key Distribution System

Excess Noise Control in Gaussian-modulated Coherent State Qu...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Bing Qi Lei-Lei Huang Yue-Meng Chi Li Qian Hoi-Kwong Lo Center for Quantum Information and Quantum Control Department of Electrical and Computer Engineering and Department of Physics University of Toronto Toronto ONT Canada

A novel polarization-frequency-multiplexing scheme is implemented to suppress noise in a fiber-based Gaussian-modulated coherent-state quantum key distribution system. The achievable secrete key rate is 0.30 bit/pulse... 详细信息

ISBN: (纸本)9781557528599

关键词： control systems Gaussian noise Gaussian distribution Quantum computing Optical fiber polarization Optical noise Fiber lasers Laser theory Phase modulation Optical pulses

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Real-Time Level Plant control Using Improved BELBIC

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IFAC Proceedings Volumes 2008年第2期41卷 4631-4635页

作者： M. Masoudinejad R. Khorsandi A. Fatehi C. Lucas S. Fakhimi Derakhshan M.R. Jamali Advanced Process Automation & Control (APAC) Research Group Faculty of Electrical Engineering K. N. Toosi University of Technology Tehran Iran Center of Excellence for Control and Intelligent Processing Electrical and Computer engineering Department University of Tehran Iran

Brain emotional learning based intelligent controller (BELBIC) is based on computational model of limbic system in the mammalian brain. In recent years, this model was applied in many linear and nonlinear control applications. Previous studies show that this controller has fast response, simple implementation and robustness with respect to disturbances. It is also possible to define emotional signal based on control application objectives. But in the previous studies, internal instability of this controller was not considered and control task were done in limited time period. In this article mathematical description of BELBIC is investigated and improved to avoid internal instability. Simulation and implementation of improved model was done on level plant. The obtained results showed that instability of model has been solved in the new model without loss of performance by using Integral Anti Windup (IAW).

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Random-party entanglement distillation in multiparty states

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Physical Review A 2008年第1期78卷 012348-012348页

作者： Ben Fortescue Hoi-Kwong Lo []Center for Quantum Information and Quantum Control Department of Electrical and Computer Engineering and Department of Physics University of Toronto Toronto Ontario Canada M5S 3G4

We describe various results related to the random-party distillation of multiparty entangled states—that is, conversion of such states into entangled states shared between fewer parties, where those parties are not predetermined. In previous work we showed that certain output states (namely Einstein-Podolsky-Rosen pairs) could be reliably acquired from a prescribed initial multipartite state [namely the W state |W⟩=13(|100⟩+|010⟩+|001⟩)] via random-party distillation that could not be reliably created between predetermined parties. Here we provide a more rigorous definition of what constitutes “advantageous” random-party distillation. We show that random-party distillation is always advantageous for W-class three-qubit states (but only sometimes for Greenberger-Horne-Zeilinger class states). We show that the general class of multiparty states known as symmetric Dicke states can be readily converted to many other states in the class via random-party distillation. Finally we show that random-party distillation is provably not advantageous in the limit of multiple copies of pure states.

关键词： Distillation

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Quantum key distribution with an unknown and untrusted source

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Physical Review A 2008年第5期77卷 052327-052327页

作者： Yi Zhao Bing Qi Hoi-Kwong Lo Center for Quantum Information and Quantum Control Department of Physics and Department of Electrical and Computer Engineering University of Toronto Toronto Ontario Canada M5S 3G4

The security of a standard bidirectional “plug-and-play” quantum key distribution (QKD) system has been an open question for a long time. This is mainly because its source is equivalently controlled by an eavesdropper, which means the source is unknown and untrusted. Qualitative discussion on this subject has been made previously. In this paper, we solve this question directly by presenting the quantitative security analysis on a general class of QKD protocols whose sources are unknown and untrusted. The securities of standard Bennett-Brassard 1984 protocol, weak+vacuum decoy state protocol, and one-decoy state protocol, with unknown and untrusted sources are rigorously proved. We derive rigorous lower bounds to the secure key generation rates of the above three protocols. Our numerical simulation results show that QKD with an untrusted source gives a key generation rate that is close to that with a trusted source.

关键词： UNCONDITIONAL SECURITY CRYPTOGRAPHY SYSTEM FIBER

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Quantum hacking: Experimental demonstration of time-shift attack against practical quantum-key-distribution systems

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Physical Review A 2008年第4期78卷 042333-042333页

作者： Yi Zhao Chi-Hang Fred Fung Bing Qi Christine Chen Hoi-Kwong Lo Center for Quantum Information and Quantum Control Department of Physics and Department of Electrical and Computer Engineering University of Toronto Toronto Ontario M5S 3G4 Canada

Quantum-key-distribution (QKD) systems can send quantum signals over more than 100km standard optical fiber and are widely believed to be secure. Here, we show experimentally a technologically feasible attack—namely, the time-shift attack—against a commercial QKD system. Our result shows that, contrary to popular belief, an eavesdropper, Eve, has a non-negligible probability (∼4%) to break the security of the system. Eve’s success is due to the well-known detection efficiency loophole in the experimental testing of Bell’s inequalities. Therefore, the detection efficiency loophole plays a key role not only in fundamental physics, but also in technological applications such as QKD systems.

关键词： Optical fibers

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Distributed Digital Content Access In a Virtual Community Based E-Learning Platform

Distributed Digital Content Access In a Virtual Community Ba...

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IEEE Frontiers in Education Conference 2008

作者： Pastor, Rafael Ros, Salvador Hernandez, Roberto Read, Timothy Castro, Manuel National Distance Learning University of Spain (UNED) Spain Centre for Technological Innovation and Development National Distance Learning University of Spain (UNED) Spain Computer Science Faculty National Distance Learning University of Spain (UNED) Spain Electrical Engineering Electronic and Control Department National Distance Learning University of Spain (UNED) Spain

ISBN: (纸本)9781424419692

Eight years on from the start of the development of the aLF (active Learning Framework) platform, by the Innova group (in the LINED, Spain), we have approximately 100,000 users grouped in more than 500 virtual learning communities. The development of an integrated space of communities and courses has provided a unified model adapted to the new European Higher Education Area (EHEA). In the first part of the paper the fundamentals of aLF are discussed, and the service model provided based on the concept of virtual community. Following the description of aLF, how the official digital repository (based on an application of Fedora) has been integrated into aLF to allow professors and students to search for (and retrieve) digital content (audio and video generated from more than 30 years of LINED activity and references from papers) is described. The paper will discuss the application developed together with the advantages of using it: recorded classes reused in the courses, access to institutional library material in a distance education model and a simple way of consulting related content to help students in their learning activities.

关键词： Digital content E-learning Federated Repositories Virtual communities

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