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SICE Annual Conference

作者： Seiji Tanaka Xin Xin Taiga Yamasaki Faculty of Computer Science and System Engineering Okayama Prefectural University Okayama Japan

This paper studies how to design a congestion controller in TCP/AQM networks. In Hollot et al. (IEEE Trans. on Automatic Control, Vol. 47, No.6, 2002), the congestion controller is conservatively designed due to using the linearized model of the TCP/AQM networks in which a structured time-delay related term is treated as an unstructured uncertainty. Without treating any time-delay related term as uncertainty, we provide a necessary and sufficient a condition of existence of PI stabilizing controller for the system, and we propose a new design of the congestion controller via solving a stabilization problem of the system with a time delay in the variables of both state and input. The simulation results are provided to validate the proposed design method.

关键词： Delay effects Control systems Communication system control Automatic control Uncertainty Pi control Electronic mail Differential equations computer science Design engineering

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A novel astronomical application for formation flying small satellites

A novel astronomical application for formation flying small ...

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60th International Astronautical Congress 2009, IAC 2009

作者： Bentum, M.J. Verhoeven, C.J.M. Boonstra, A.J. Van Der Veen, A.J. Gill, E.K.A. University of Twente Faculty of Electrical Engineering Mathematics and Computer Science P.O. Box 217 7500 AE Enschede Netherlands ASTRON P.O. Box 2 7990 AA Dwingeloo Netherlands Technical University of Delft Faculty of Aerospace Engineering - Space System Engineering Kluyverweg 1 2629 HS Delft Netherlands Technical University of Delft Faculty of Electrical Engineering Mathematics and Computer Science Mekelweg 4 2628 CD Delft Netherlands

ISBN: (纸本)9781615679089

OLFAR, Orbiting Low Frequency Antennas for Radio Astronomy, will be a space mission to observe the universe frequencies below 30 MHz, as it was never done before with an orbiting telescope. Because of the ionospheric scintillations below 30 MHz and the opaqueness of the ionosphere below 15 MHz, a space mission is the only opportunity for this as yet unexplored frequency range in radio astronomy. The frequency band is scientifically very interesting for exploring the early cosmos at high hydrogen redshifts, the so-called dark-ages and the epoch of reionization, the discovery of planetary and solar bursts in other solar systems, for obtaining a tomographic view of space weather, ultra-high energy cosmic rays and for many other astronomical areas of interest. Because of the low observing frequency the aperture size of the instrument must be in the order of 100 km. This requires a distributed space mission which is proposed to be implemented using formation flying of small satellites. The individual satellites are broken down in five major subsystems: the spacecraft bus, the antenna design, the frontend, backend and data transport. One of the largest challenges is the inter-satellite communication. In this paper the concept and design considerations of OLFAR are presented.

关键词： Cosmology

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Iris Biometric Cryptography for Identity Document

Iris Biometric Cryptography for Identity Document

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International Conference of Soft Computing and Pattern Recognition (SOCPAR)

作者： Sim Hiew Moi Nazeema Binti Abdul Rahim Puteh Saad Pang Li Sim Zalmiyah Zakaria Subariah Ibrahim Department of Software Engineering Faculty of Computer Science and Information System Universiti Teknologi Malaysia Johor Malaysia Department of System & Communication Faculty of Computer Science and Information System Universiti Teknologi Malaysia Johor Malaysia

Currently, it is noticed that users tend to choose shorter password as their authentication which can be easily attacked. Biometric technologies such as fingerprint scanning, voice authentication, face recognition, signature, hand geometry and iris recognition is now playing an important role especially in application related to security issue. In this work, we present an approach to generate a unique and more secure cryptographic key from iris template. The iris images are processed to produce iris template or code to be utilized for the encryption and decryption tasks. AES cryptography algorithm are employed to encrypt and decrypt the identity data. Distance metric such as hamming distance and Euclidean distance are used for the template matching identification process. Experimental results show that this system can obtain a higher security with a low false rejection or false acceptance rate.

关键词： Biometrics Cryptography Authentication Fingerprint recognition Face recognition Geometry Iris recognition Security Identity-based encryption Hamming distance

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Motion planning in unknown environment using an interval fuzzy type-2 and neural network classifier

Motion planning in unknown environment using an interval fuz...

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IEEE International Conference on Computational Intelligence for Measurement systems and Applications (CIMSA)

作者： Siti Nurmaini Siti Zaiton Mohd Hashim Department of Computer Engineering Faculty of Computer Science University of Sriwijaya Indonesia Department of Software Engineering Faculty of Computer Science and Information System Universiti Teknologi Malaysia Johor Bahru Malaysia

This paper describes environmental recognition and motion control using weightless neural network classifier and interval type-2 fuzzy logic controller. The weightless neural network classifies geometric feature such as U-shape, corridor and left or right corner using ultrasonic sensors. The neural network utilizes previous sensor data and analyzes the situation of the current environment. The behavior of mobile robot is implemented by means of fuzzy control rules. Based on the performance criteria the quality of controller is evaluated to make navigation decisions. This functionality is demonstrated on a mobile robot using modular platform and containing several microcontrollers implies the implementation of a robust architecture. The proposed architecture implemented using low cost range sensor and low cost microprocessor. The experiment results show that the mobile robot can recognize the current environment and was able to successfully avoid obstacle in real time.

关键词： Fuzzy neural networks Neural networks Mobile robots Motion control Costs Fuzzy logic Data analysis Fuzzy control Navigation Microcontrollers

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Making applications more intelligent: A case study of optimizing route selection for emergency vehicles

Making applications more intelligent: A case study of optimi...

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Annual IEEE Symposium on computer-Based Medical systems

作者： Sandi Pohorec Mateja Verlic Milan Zorman Laboratory of system design Faculty of electrical engineering and computer science University of Maribor Slovenia

We present the results of a data mining research on the use of GPS positions and speed of travel of vehicles in urban areas to determine optimal travel routes for emergency vehicles. A new approach using predictive programming is presented. The approach focuses on using data mining of existing data as the key factor in the application logic where various decisions are to be made. The main appeal of such an approach is that the application logic evolves over time according to the application data. As the data changes the decisions soon follow. This gives the impression of intelligent behavior of the application.

关键词： Intelligent vehicles Global Positioning system Data mining Mobile handsets Poles and towers Logic programming Satellite navigation systems Roads Velocity measurement Earth

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Broad-band cruciform substrate integrated waveguide couplers

Broad-band cruciform substrate integrated waveguide couplers

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Asia-Pacific Conference on Microwave

作者： Mitsuyoshi Kishihara Motoyuki Komatsubara Kensuke Okubo Isao Ohta Faculty of Computer Science and System Engineering Okayama Prefectural University Soja Okayama Japan

This paper describes a method to broaden the bandwidth of cruciform substrate-integrated waveguide couplers. The design and the analysis of the couplers are performed using the H-plane planar circuit approach, and the frequency characteristics of the couplers designed at 24 GHz are shown. As a result, fractional bandwidths of 30% for a 3 dB coupler and 16% for a 1.7 dB coupler can be realized. The design results are verified numerically and experimentally.

关键词： Couplers Circuits Bandwidth Impedance Frequency Performance analysis Millimeter wave technology Dielectric substrates computer science systems engineering and theory

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Context assessment strategies for Ubiquitous Robots

Context assessment strategies for Ubiquitous Robots

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IEEE International Conference on Robotics and Automation (ICRA)

作者： Fulvio Mastrogiovanni Antonio Sgorbissa Renato Zaccaria The Department of Communication Computer and System Science Faculty of Engineering University of Genova Genoa Italy

This paper presents an architecture for context-aware Ubiquitous Robotics applications, where mobile robots cooperate with intelligent environments to fulfill their tasks. Specifically, the work is focused on distributed knowledge representation issues and context assessment strategies, and introduces a technique for on-line context recognition in highly dynamic environments. Experimental validation, performed in a civillian hospital building, is described and discussed.

关键词： Intelligent robots Mobile robots Context awareness Robot sensing systems Intelligent sensors Intelligent actuators Cognitive robotics Robotics and automation Knowledge representation Context modeling

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Can the Energy and Actuated Variables of Underactuated Mechanical systems be Controlled? –Example of the Acrobot with Counterweight

Can the Energy and Actuated Variables of Underactuated Mecha...

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Joint 48th IEEE Conference on Decision and Control and 28th Chinese Control Conference

作者： Xin Xin Lei Guo Faculty of Computer Science and System Engineering Okayama Prefectural University School of Instrument Science and OptoElectronics Engineering Beihang University

The energy-based control approach aiming to control the total mechanical energy and actuated variables of underactuated mechanical systems has generated renewed interests in studying these *** applications of the approach to the swing-up control for the Acrobot(2-link planar robot with passive first joint),the Pendubot(2-link planar robot with passive second joint),and an n-link revolute planar robot with a passive joint robot,have been *** paper investigates whether the objective of controlling the energy and actuated variables to some given desired values can be achieved for any underactuated mechanical *** aim to answer this question by studying the problem of swinging up a modified Acrobot,which has a counterweight connected to its first link and is called CWA(Counter-Weighted Acrobot) *** analyzing globally the behavior of the solution of the closed-loop system consisted of the CWA and the controller designed via the energy-based control approach,we show that unless the mechanical parameters of the CWA satisfying a constraint,the swing-up controller fails to achieve the goal of stabilizing the energy to the potential energy at the upright position and stabilizing the actuated joint variable to *** simulation results are provided to validate the theoretical results.

关键词： Acrobot Can the Energy and Actuated Variables of Underactuated Mechanical systems be Controlled Example of the Acrobot with Counterweight

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SR direct etching of PTFE and its application to millimeter-wave PTFE-filled waveguide

IEEJ Transactions on Electronics, Information and Systems

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IEEJ Transactions on Electronics, Information and systems 2009年第2期129卷 259-266+9页

作者： Kishihara, Mitsuyoshi Ukita, Yoshiaki Yamamoto, Shigeaki Ohta, Isao Utsumi, Yuichi Faculty of Computer Science and System Engineering Okayama Prefectural University 111 Kuboki Soja-shi Okayama 719-1197 Japan Japan Laboratory of Advanced Science and Technology for Industry University of Hyogo 3-1-2 Kamigori Ako Hyogo 678-1205 Japan University of Hyogo 2167 Shosha Himeji-shi Hyogo 671-2280 Japan

Microdevices have recently been developed by various micromachining technologies such as laser cutting, lithography, etc. PTFE is widely used as a microwave and millimeter-wave material. However, it is known that PTFE is too difficult to process with high precision by conventional machining, or even by laser cutting or electrical discharge machining. It has been reported that PTFE microstructures can be fabricated by direct exposure to synchrotron radiation. In this paper, the SR direct etching of PTFE is introduced and a trial fabrication of millimeter-wave PTFE-filled waveguide by sputter deposition of metal is attempted. © 2009 The Institute of Electrical Engineers of Japan.

关键词： Millimeter waves

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Local search engine with global content based on domain specific knowledge

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WSEAS Transactions on Information science and Applications 2009年第9期6卷 1544-1554页

作者： Pohorec, Sandi Verlič, Mateja Zorman, Milan Laboratory for System Design University of Maribor Faculty of Electrical Engineering and Computer Science Smetanova 17 2000 Maribor Slovenia

In the growing need for information we have come to rely on search engines. The use of large scale search engines, such as Google, is as common as surfing the World Wide Web. We are impressed with the capabilities of these search engines but still there is a need for improvment. A common problem with searching is the ambiguity of words. Their meaning often depends on the context in which they are used or varies across specific domains. To resolve this we propose a domain specific search engine that is globally oriented. We intend to provide content classification according to the target domain concepts, access to privileged information, personalization and custom ranking functions. Domain specific concepts have been formalized in the form of ontology. The paper describes our approach to a centralized search service for domain specific content. The approach uses automated indexing for various content sources that can be found in the form of a relational database, web service, web portal or page, various document formats and other structured or unstructured data. The gathered data is tagged with various approaches and classified against the domain classification. The indexed data is accessible through a highly optimized and personalized search service.

关键词： Search engines

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