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Design of fuzzy controller for automatic steering

Design of fuzzy controller for automatic steering

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作者： Ko, Sang-Jin Lee, Jun-Woo Choi, Byoung-Suk Lee, Ju-Jang Graduate School of Automobile Technology KAIST Daejeon Korea Republic of Robotics Program KAIST Daejeon Korea Republic of Department of Electrical Engineering and Computer Science KAIST Daejeon Korea Republic of

ISBN: (纸本)9784990288020

Unmanned vehicle is future vehicle technology. Lateral control technology and longitudinal control technology are needed for unmanned vehicle. Automatic steering system is lateral control technology. A automatic steering system automatically controls the steering to keep the vehicle in its land and also to follow the lane as it curves around. This paper proposes automatic steering system based on fuzzy logic. If the fuzzy rules are set properly, the fuzzy controller can control the objective system nicely. To design an automatic steering system, lateral error dynamics of a vehicle is derived. The proposed automatic steering system is evaluated by SIMULINK in MATLAB. The simulation results show that the proposed automatic steering system works satisfactorily for keeping the vehicle in its land and following the lane. ©ISAROB 2008.

关键词： Fuzzy control

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An analysis of the modes of wave propagation in cylindrical shells

An analysis of the modes of wave propagation in cylindrical ...

引用

7th European Conference on Noise Control 2008, EURONOISE 2008

作者： Liu, Y.-C. Hwang, Y.-F. Huang, J.-H. Graduate Institute of the Mechanical and Aeronautical Engineering Feng Chia University No. 100 Wenhwa Rd. Seatwen 40724 Taichung Taiwan Electroacoustic Graduate Program No. 100 Wenhwa Rd. Seatwen 40724 Taichung Taiwan Department of Mechanical and Computer-Aided Engineering No. 100 Wenhwa Rd. Seatwen 40724 Taichung Taiwan

The dynamic stiffness method is proposed to examine the dispersion of waves in an inclusion-reinforced composite plate. The shape of inclusion is modelled as spheroid that enables the composite reinforcement geometrical configurations ranging from sphere to short and continuous fiber. Using the Mori-Tanaka mean-field theory, the effective elastic moduli of the composite plate are predicted explicitly and are able to elucidate the effect of inclusion's shape and volume fraction on the composite elastic behaviour. The resulting moduli are then applied to the dynamic stiffness matrix. From these findings indispensable information on the requirements for examining the dispersion of waves in the plate in vacuo are obtained. Numerical simulations have been given for dispersions in various wave types at various inclusion shape, inclusion content, and plate thickness as well. The results indicate that the inclusion content, aspect ratio and the plate thickness affect the propagation velocity and wavenumbers. Larger aspect ratios generally possess higher propagation speed. In other words, using short fibers generally results in a lower propagation speed.

关键词： Stiffness

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Fuzzy Fusion for Affective State Assessment in Distance Learning Based on Image Detection

Fuzzy Fusion for Affective State Assessment in Distance Lear...

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2008 International Conference on Audio，Language and Image Processing(2008国际声音、语言、图像过程大会)

作者： Kuoan Hwang Chiahao Yang Department of Computer Science and Information Engineering & Graduate Institute of Networking and Co Graduate Institute of Informatics Doctoral program Chaoyang University of Technology

Distance learning is a learning style that can overcome the limitation of time and space. Because of the distance, teachers can not handle the student's learning situation, and they do not know whether the student is attentive, drowsy or absent. If teachers can know the student's affective state, they can overcome the difficult. The research applies the image recognition technologies to capture the face images of students when they are learning and analyzes their face features to evaluate the student's affective state by Fuzzy Integral. Finally, teachers can monitor the student's behavior by the detection results on the system interface.

关键词： Distance learning Skin computers Distance measurement Face Image color analysis Education

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A Progress Report and a Proposal: Interactivity in Ubiquitous Learning Enhanced by Virtual Tutors in e-Learning Contents

A Progress Report and a Proposal: Interactivity in Ubiquitou...

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IEEE International Conference on Sensor Networks, Ubiquitous, and Trustworthy Computing

作者： Toshiyuki Yamamoto Ryo Miyashita Department of Media Informatics Kanazawa Institute of Technology Japan Graduate Program in Information andComputer Engineering Kanagawa Institute of Technology Japan Graduate Program in Information and Computer Engineering Kanazawa Institute of Technology Japan

ISBN: (纸本)9780769531588;9780769534114

It is proposed in this session that the interactivity necessary in ubiquitous learning can be enhanced by the virtual tutor who mediates between the learner and the e-learning contents. Arousing students' intellectual curiosity and raising their motivation to learn are the two great goals for e-learning contents developers. It is supposed that the interaction in the communication between the teacher and his/her students in a regular classroom can be maintained in e-learning with the help of virtual tutor, which appears on the learning contents in a timely fashion to give learners advice, encouragement, reminders, and such. The session includes discussions to develop such a system making use of the most updated technology as well as demonstrations of such a system which has been experimented at Department of Media Informatics. It is proved that the learning environment where human interactivity is essential can be reconstructed in terms of the proposed virtual tutor. This paper presentation includes demonstrations of QED as well as a discussion of the importance of interactivity in ubiquitous e-learning.

关键词： Proposals Electronic learning Educational institutions computer networks computer displays Pervasive computing Informatics Humans computer science education computer graphics

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Light scattering by white-emitting CdSe nanocrystals and traditional YAG:Ce3+ phosphor particles

Light scattering by white-emitting CdSe nanocrystals and tra...

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2008 MRS Fall Meeting

作者： Gosnell, Jonathan D. Weiss, Sharon M. Interdisciplinary Graduate Program in Materials Science Vanderbilt University Station B 350106 Nashville TN 37235 United States Department of Electrical Engineering and Computer Science Vanderbilt University Station B 351824 Nashville TN 37235 United States

ISBN: (纸本)9781615677740

In order for solid state lighting technology to become a mainstream technology, one of the major challenges to overcome is increasing the efficiency of these devices while maintaining a proper color balance. A significant source of efficiency loss in commercial phosphor-based white light-emitting diodes (LEDs) is light scattering off large, micron-sized phosphor particles. The use of recently reported single-size CdSe white-light nanocrystals in place of traditional phosphors, such as YAG:Ce3+, could lead to lower scattering losses and higher device efficiencies as a result of the extremely small CdSe core diameter of approximately 1.5 nm. This work theoretically and experimentally investigates the absorption, scattering, and extinction coefficients and cross sections of CdSe white-light nanocrystals in comparison to YAG:Ce3+ phosphor particles. Calculations were performed based on the Rayleigh approximation and Mie theory of scattering. Experiments were carried out using thin films of encapsulated nanocrystals. By measuring the absorbance and thickness of the films, in addition to the concentration of the nanocrystals, extinction coefficients and cross sections were determined using the Beer-Lambert law. A reasonable agreement was obtained between theoretical and experimental data showing that the size of the particle has a significant impact on the extinction, absorption, and scattering properties of thin films. The considerably reduced scattering from the nanocrystals compared to traditional phosphors, along with their inherent high quality white light emission, makes them a promising candidate for future solid state lighting applications. © 2009 Materials Research Society.

关键词： Cadmium compounds

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6GLAD: IPv6 Global to Link-layer ADdress Translation for 6LoWPAN Overhead Reducing

6GLAD: IPv6 Global to Link-layer ADdress Translation for 6Lo...

引用

Conference on Next Generation Internet Networks, NGI

作者： Andre Zimmermann Jorge Sa Silva Joao Bosco Mangueira Sobral Fernando Boavida CISUC Department of Informatics Engineering University of Coimbra Portugal Graduate Program Computer Sciences Federal University of Santa Catarina Brazil

The next generation of wireless sensor networks will integrate communication systems beyond the third generation paradigm. As a result of this integration, the new communication systems will be fed by the sensor networks with information gathered from the environment, achieving context awareness. To reach the necessary end-to-end connectivity between all-IP networks and sensor networks, the IETF 6LoWPAN working group has designed an IPv6 adaptation layer for low power devices. This protocol stack provides IPv6 interoperability to the sensor networks, thus avoiding as much overhead as possible. This paper analyses and evaluates the associated IP communication overhead in each possible 6LoWPAN scenario, from intra to inter network communication. We conclude that, even the 6LoWPAN offering a light weight IP solution for link local sensor network communication, it has a relatively high overhead when data flows between different networks. In order to avoid the communication overhead when global IPv6 addressing is necessary we propose a new solution based on a 6LoWPAN global-to-link-layer address translation.

关键词： Wireless sensor networks Access protocols Costs Batteries Network topology Informatics computer networks Electronic mail Next generation networking Sensor systems

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Attentiveness Assessment in Learning Based on Fuzzy Logic Analysis

Attentiveness Assessment in Learning Based on Fuzzy Logic An...

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International Conference on Intelligent Systems Design and Applications (ISDA)

作者： Kuo-An Hwang Chia-Hao Yang Department of Computer Science and Information Engineering & Graduate Institute of Networking and CommunicationEngineering ChaoYang University of Technology Taiwan Graduate Institute of Informatics Doctoral program ChaoYang University of Technology Taiwan

Learner attention affects learning efficiency. However, in many classes, teachers cannot assess the degree of attention of every student. When a teacher is capable of addressing inattentive students immediately, he can avoid situations in which students are inattentive. Many studies have analyzed student attentiveness by the applying of image detection technologies. If this mechanism can be applied to in-class learning, it will help teachers keep students attentive, and reduce teacher load during class. This study mainly applies fuzzy logic analysis of student facial images when participating in class. Applying fuzzy logic can prevent erroneous judgments associated with a single term, and help teachers deal with student attentiveness.

关键词： Fuzzy logic Face detection Image analysis Image color analysis Education Eyes Design engineering Chaotic communication Image processing Face recognition

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Two-dimensional location and direction estimating method

Two-dimensional location and direction estimating method

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

作者： Teruhiro Haga Sosuke Tsukamoto Hiroshi Hoshino Masters Program in Electronic and Computer Engineering Graduate School of Science and Engineering Tokyo Denki University Hiki Saitama Japan School of Science and Engineering Tokyo Denki University Hiki Saitama Japan

In this paper, a method of estimating both the position and the rotation angle of an object on a measurement stage was proposed. The system utilizes the radio communication technology and the directivity of an antenna. As a prototype system, a measurement stage (a circle 240mm in diameter) with 36 antennas that placed in each 10 degrees was developed. Two transmitter antennas are settled in a right angle on the stage as the target object, and the position and the rotation angle is estimated by measuring efficiency of the radio communication of each 36 antennas. The experimental result revealed that even when the estimated location is not so accurate (about a 30 mm error), the rotation angle is accurately estimated (about 2.33 degree error on average). The result suggests that the proposed method will be useful for estimating the location and the direction of an object.

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A handle electrode system for measuring heart rate while riding a bicycle

A handle electrode system for measuring heart rate while rid...

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

作者： Masutaka Watanabe Sosuke Tsukamoto Hiroshi Hoshino Masters Program in Electronic and Computer Engineering Graduate School of Science and Engineering Tokyo Denki University Hiki Saitama Japan School of Science and Engineering Tokyo Denki University Hiki Saitama Japan

In this paper, a handle-electrode system is proposed for obtaining the heart rate of a user while riding a bicycle. The system was designed to measure the user's heart rate by only gripping the handle of a bicycle. Three electrodes made from conductive cloth were adhered to the handle. A method detecting heart-rate from the obtained electrocardiogram was also proposed. To assess the applicability of the proposed system, a simple experiment was performed. The experiment was performed in four conditions of road surfaces; lawn, asphalt, a tiled, and an uneven road. Experimental result suggests that the proposed system can be useful for obtaining R waves while riding a bicycle.

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Recommending mobile content using content diffusion and user preference transition

Recommending mobile content using content diffusion and user...

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2008 International Conference on e-Learning, e-Business, Enterprise Information Systems, and e-Government, EEE 2008

作者： Lee, Tong Queue Lee, Eunchang Park, Young Park, Yongtae Department of Mobile Internet Dongyang Technical College Seoul Korea Republic of Graduate Program in Technology and Management Seoul National University Seoul Korea Republic of Department of Computer Science and Information Systems Bradley University Peoria IL United States Department of Industrial Engineering Seoul National University Seoul Korea Republic of

ISBN: (纸本)1601320639

Recommendation accuracy is especially important in mobile e-commerce environments due to the limited screen size of mobile devices and relatively expensive connection costs. Mobile content tends to be fashionable and are geared for young users. This paper presents a novel method of building a more accurate recommender system for mobile content in a mobile ecommerce environment. The method is based on collaborative filtering, and models content diffusion and user preference transition and incorporates them in constructing pseudo ratings from implicit feedback data. In a variety of experiments, recommender systems based on the method showed significantly better recommendation accuracy than a pure collaborative filtering-based recommender system.

关键词： Collaborative filtering

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