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Security analysis and improvement of hsu et al.'s threshold proxy signature scheme

International Journal of Network Security 2006年第1期2卷 69-72页

作者： Guo, Lifeng Cheng, Xiangguo Liu, Yang Institute of Systems Science Academy of Mathematics and System Sciences Chinese Academy of Sciences Graduate School of Chinese Academy of Sciences Beijing 100080 China 21 Heng Mui Keng Terrace Singapore State Key Laboratory of Integrated Services Network Xidian University Xi'an 710071 China Software Institute School of Electronic Engineering and Computer Science Peking University 100871 China

In 1999, Sun et al. proposed a new (t, n) threshold proxy signature scheme based on Zhang's threshold proxy signature scheme. But in 2003 Hsu et al. pointed out that Sun's scheme suffered from a drawback and demonstrated an improvement to counter it. In this paper we point out that Hsu's scheme suffers from an insider attack against their scheme. That is, a malicious proxy signer can forge a valid threshold proxy signature on any message. To thwart this attack, some improvements are further proposed.

关键词： Authentication

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A web-based integrated education system for a seamless environment among teachers, students, and administrators

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systems and computers in Japan 2006年第5期37卷 14-24页

作者： Hanakawa, Noriko Akazawa, Yoshiko Mori, Akira Maeda, Toshiyuki Inoue, Shunji Tsutsui, Shigeyoshi Faculty of Management Information Hannan University Matsubara 580-8502 Japan System Engineering Division Solutions and Services Educational Solutions Group Fujitsu Limited Tokyo 105-7123 Japan Research Center for Computer Science Hannan University Matsubara 580-8502 Japan Faculty of Management Information Hannan University Corporate Information Graduate School Information Processing Society of Japan IEEE System Engineering Division Solutions and Services Educational Solutions Group Research Center for Computer Science Faculty of Management Information Hannan University Institute of Electrical Engineers of Japan Japanese Society for Artificial Intelligence Japan Fuzzy Knowledge and Information Society Institute of Systems Control and Information Engineers

The authors created a Web-based integrated education support system that unified the data in the administrative system and the education system in a university. The purpose of the system was to make the administrative system and education system data that had previously been separated seamless, and to implement seamless access from inside and outside the university while maintaining security. Moreover, the authors emphasized the development of a portal site as a point of contact for the system. As a result of using software packages and existing technology for the other servers and databases, and making a policy of not changing the administrative system at all, the authors were able to create the system in a short period of 5 months. After the system was operational, preparation and review for class could be done at home, and evaluations of reports and final determinations of grades could be done from outside the university. This confirmed that the education system was effective. Finally, the authors looked at the trouble and performance problems that occurred involving local rules in the business department during operation, as well as countermeasures for them. © 2006 Wiley Periodicals, Inc.

关键词： Learning systems

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Hemodynamic Responses during Simulated Automobile Driving in a Monotonous Situation

Hemodynamic Responses during Simulated Automobile Driving in...

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

作者： T. Yamakoshi K. Yamakoshi S. Tanaka M. Nogawa Y. Sawada P. Rolfe Graduate School of Natural Science & Technology Kanazawa University Kanazawa Japan Institute of Nature and Environmental Technology Kanazawa University Kanazawa Japan Department of Human and Mechanical Systems Engineering Kanazawa University Kanazawa Japan Faculty of Medicine Sapporo Medical University Sapporo Japan Department of Communication Computer & System Science University of Geneva Genoa Italy

Long hours of automobile driving under monotonous situations may cause the lowering of what we term a driver's activation state (DAS) or in other words the production of drowsiness, resulting in an increased risk of a traffic accident. There is therefore a need to create a newly advanced system focused on the DAS in-car, hopefully thus avoiding potentially dangerous situations. In order to develop such a system as a final goal, we have firstly set out to acquire such cardiovascular variables as beat-by-beat blood pressure (BP), RR interval from ECG and normalized pulse volume (NPV) used as a peripheral vascular tone of alpha-adrenergic sympathetic activity, during presentation to the driver of a screen movie simulating monotonous travel at constant speed on a test-course. Subsequently, we have investigated the reactivity in terms of the driver's cardiovascular hemodynamics. Through the successful monitoring of cardiovascular parameters during the movie presentation obtained in 11 healthy male subjects, the following results were obtained: The monotonous driving produces a statistically significant gradual rise in BP following drowsiness, which could be explained by enhancement of sympathetic activity using a time-frequency analysis of BP and RR. This finding strongly indicates that continuous driving in such monotonous situations can make a driver considerably stressful and thus may cause a gradual increase in BP, and that this gradual BP increase may be used as a possible index relevant to the DAS. This finding was also confirmed by the analysis of NPV, suggesting that the gradual increase in BP during the monotonous driving would be rather caused by a regulation of peripheral vasomotor constriction

关键词： Hemodynamics Automobiles Cardiology Motion pictures Production Road accidents Blood pressure Biomedical monitoring Electrocardiography system testing

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Chitosan for Biofunctionalization of Microsystems

Chitosan for Biofunctionalization of Microsystems

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IEEE/NLM Life Science systems and Applications Workshop

作者： Stephan T. Koev Michael A. Powers Vlad Badilita Hyunmin Yi William E. Bentley Gregory F. Payne Gary W. Rubloff Reza Ghodssi Institute for Systems Research ISR University of Maryland College Park MD USA University System of Maryland Adelphi MD US Department of Materials Science and Engineering University of Maryland College Park MD USA Department of Chemical Engineering University of Maryland College Park MD 20742 University of Maryland Biotechnology Institute (UMBI) University of Maryland College Park MD 20742 Bioengineering Graduate Program University of Maryland College Park MD 20742 University of Maryland College Park MD USA University of Maryland Biotechnology Institute College Park MD USA Institute for Systems Research (ISR) University of Maryland College Park MD 20742 Department of Materials Science and Engineering University of Maryland College Park MD 20742 Department of Electrical and Computer Engineering University of Maryland College Park MD 20742 Institute for Systems Research (ISR) University of Maryland College Park MD 20742

ISBN: (纸本)1424402778

We present the use of the polysaccharide chitosan for immobilizing biomolecules on microfabricated device surfaces. The main advantages of chitosan are its abundance of primary amine groups and its ability to be electrodeposited. Biomolecules are easily attached to chitosan 's amines by standard glutaraldehyde chemistry. The electrodeposition of chitosan allows accurate spatial and temporal control of biomolecule placement. We have demonstrated this biofunctionalization method for two different bioMEMS devices: a biophotonic sensor and a micromechanical biosensor. We have successfully assembled probe DNA on each of them and detected hybridization with target DNA as a demonstration of sensor operation. Here, we briefly present the fabrication procedure and testing results for both of these bioMEMS sensing devices

关键词： DNA Biosensors Molecular biophysics Probes Micromechanical devices Optical sensors Optical surface waves Optical interferometry Assembly Biomedical optical imaging

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First steps towards organic computing systems -Monitoring an adaptive protocol stack with a fuzzy classifier system

First steps towards organic computing systems -Monitoring an...

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2005 Computing Frontiers Conference

作者： Schölar, Thorsten Müller-Schloer, Christian University of Hannover Institute of Systems Engineering System and Computer Architecture Appelstraße 4 30167 Hannover Germany

ISBN: (纸本)1595930183

Protocol stacks for small devices like mobile phones have to fulfill multiple functions in different environments. This has lead to highly complex solutions with alternative stacks. It is more economical to construct new stacks from building blocks on the fly depending on the current requirements. Such an adaptive architecture is an example of an organic computing system. In this paper we show how a proposed monitoring architecture for adaptive protocol stacks fits into the observer/controller pattern of organic computing. The protocol stack framework and the observer/controller pattern are briefly described. Subsequently the observer/controller pattern is mapped onto the framework architecture. Two implementations for monitoring agents are described, a finite state machine solution and a fuzzy classifier approach. The fuzzy classifier system is described in detail. It is shown that a finite state machine and a standard Markovian classifier system can be generalised into a non-Markovian learning classifier system, combining the advantages of both parents. Copyright 2005 ACM.

关键词： Computation theory

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Background initialization with a new robust statistical approach

Background initialization with a new robust statistical appr...

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2nd Joint IEEE International Workshop on Visual Surveillance and Performance Evaluation of Tracking and Surveillance, VS-PETS

作者： Wang, Hanzi Suter, David Institute for Vision System Engineering Department of Electrical. and Computer Systems Engineering Monash University Clayton Vic. 3800 Australia

ISBN: (纸本)0780394240

Initializing a background model requires robust statistical methods as the task should be robust against random occurrences of foreground objects, as well as against general image noise. The Median has been employed for the problem of background initialization. However, the Median has only a breakdown point of 50%. In this paper, we propose a new robust method which can tolerate more than 50% of noise and foreground pixels in the background initialization process. We compare our new method with five others and give quantitative evaluations on background initialization. Experiments show that the proposed method achieves very promising results in background initialization. ©2005 IEEE.

关键词： Space surveillance

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Background initialization with a new robust statistical approach

Background initialization with a new robust statistical appr...

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Joint IEEE International Workshop on Visual Surveillance and Performance Evaluation of Tracking and Surveillance

作者： Hanzi Wang D. Suter Institute for Vision System Engineering Department of . Electrical. and Computer Systems Engineering Monash University Clayton VIC Australia

Initializing a background model requires robust statistical methods as the task should be robust against random occurrences of foreground objects, as well as against general image noise. The median has been employed for the problem of background initialization. However, the median has only a breakdown point of 50%. In this paper, we propose a new robust method which can tolerate more than 50% of noise and foreground pixels in the background initialization process. We compare our new method with five others and give quantitative evaluations on background initialization. Experiments show that the proposed method achieves very promising results in background initialization.

关键词： Noise robustness Layout Background noise systems engineering and theory Training data Machine vision Australia Statistical analysis Electric breakdown Tracking

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Non-parametric ML channel estimator and detector for OFDM

Non-parametric ML channel estimator and detector for OFDM

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13th European Signal Processing Conference, EUSIPCO 2005

作者： Bhatia, Vimal Mulgrew, Bernard Falconer, David D. Institute for Digital Communications School of Engineering and Electronics University of Edinburgh Edinburgh EH9 3JL United Kingdom Broadband Communications and Wireless System Department of Systems and Computer Engineering Carleton University Ottawa ON K1S 5B6 Canada

ISBN: (纸本)1604238216

A maximum-likelihood channel estimator for the orthogonal frequency division multiplexing (OFDM) communication environments, in presence of interference is discussed here. We study a training based scenario, where the channel is estimated based on pilots that precede the transmission of the information. To reduce the number of estimation parameters, we estimate the channel iteratively in timedomain. Since interference from other users provides no useful information we do not estimate parameters of the interference and neither we neglect the affect of the interference instead interference along with Gaussian noise is perceived as non-Gaussian noise. The algorithm assumes no apriori knowledge about the interfering channel and signal at the receiver, further no-assumption on the statistical properties of the interferer is assumed which makes this algorithm robust. The estimated channel information along with the estimated distribution are then utilized to equalize the subsequent data blocks.

关键词： Orthogonal frequency division multiplexing

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Towards a Framework and a Design Methodology for Autonomic SoC

Towards a Framework and a Design Methodology for Autonomic S...

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International Conference on Autonomic Computing (ICAC)

作者： G. Lipsa A. Herkersdorf W. Rosenstiel O. Bringmann W. Stechele Microelectronic System Design FZI Karlsruhe Germany Institute for Integrated Systems Technical University Munich Germany Department of Computer Engineering University of Tubingen Germany

This paper proposes autonomic or organic computing principles to be applied to hardware design methods for future SoC solutions. Incorporating self-calibration, fault tolerance or even self-healing concepts into integrated circuit systems represents a major conceptual shift, which requires new design processes and tools. In the future, guarantee of functional correctness at the chip level includes self configuration of adaptable components and flexible interfaces supporting a flexible component composition within complex SoC systems

关键词： Design methodology Hardware Fault tolerant systems Temperature Frequency Switches Libraries Microelectronics Design engineering Process design

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Development of the balloon-cable driven robot for information collection from sky and proposal of the search strategy at a major disaster

Development of the balloon-cable driven robot for informatio...

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IEEE/ASME (AIM) International Conference on Advanced Intelligent Mechatronics

作者： F. Takemura M. Enomoto T. Tanaka K. Denou Y. Kobayashi S. Tadokoro International Rescue System Institute Kobe Japan Department of Computer and Systems Engineering Kobe University Kobe Japan Graduate School of Information Sciences University of Tohoku Sendai Japan

At large-scale urban earthquake disaster, the human search and the information collection are the most important process of rescue activities. This research develops the balloon-cable driven robot for information acquisition from sky at crushed structures at landslide caused by huge earthquake. The balloon, which hangs up several sensors (sensor unit, SU), uses "a natural shape balloon". Three cables are connected to the SU, and the balloon with sensors is driven by expansion and contraction of the cables length. Moreover, we propose the human search system by electromagnetic waves. Recently, a lot of people have cellphones or mobile devices. Our proposing search system is the position of a human body using this robot with the electromagnetic waves coming from the direction finder (ESPAR antenna). This paper describes the usefulness of the human body searching strategy by several experimental results

关键词： Proposals Humans Earthquakes Robot sensing systems Cables Electromagnetic scattering Large-scale systems Terrain factors Shape Cellular phones

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