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作者： Mochizuki, Tatsuya Hayashi, Eiji Graduate School of Computer Science and System Engineering Kyushu Institute of Technology 680-4 Iizuka City Fukuoka 820-8502 Japan Department of Mechanical Information Science and Technology Kyushu Institute of Technology 680-4 Iizuka City Fukuoka 820-8502 Japan

ISBN: (纸本)9784990288020

Image information provided by cameras is strongly affected by environmental influence of an object's circumjacent circumference. Therefore, in this study, we integrate distance information provided from a laser range sensor (LRS) and image information provided by a camera. This combination reduced environmental influence. This system consists of an object extraction section and a recognition processing section, and we are now developing the object extraction section. First, the object extraction section performs region splitting of image information provided by a camera. The distance information that was provided from the LRS is converted into a set of three-dimensional coordinates that matched the camera image. The integrated processing matches distance information with the image which did the region splitting. And it calculates the distance to each area. It integrates all of the converted information and extracts the object from the integrated information. In this study we inspected the effectiveness of the system by performing an object extraction experiment using the combined integrated distance information and image information. From these results, we have learned how to remove a background and a floor surface by using the distance information, and simpler object extraction was enabled. ©ISAROB 2008.

关键词： Object recognition

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Torque and rotational speed estimation with parameter identification of Line-start Induction Motor for Motor Operated Valve

Torque and rotational speed estimation with parameter identi...

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International Conference on Control, Automation and systems ( ICCAS)

作者： Akiko Takahashi Ryuichi Oguro Kenta Sakane Department of Computer Science and System Engineering Kyushu Institute of Technology Fukuoka Japan

This paper presents a torque and rotational speed estimation method for line-start induction motor operated valves. Routine inspections are carried out to those valves, because motor operated valves are used in the serious plant such as power plant. and securing reliability is an extreme important matter for these systems. Movement environments in these plants are high temperature and humidity, so it is difficult to put sensors near motors. In such a case, we must find the trouble of the system without torque sensor or speed sensor. The proposal method can estimate the torque and rotational speed of induction motor by using time-series data of voltages and currents at the switchboard. Furthermore, we propose the parameter identification method of mutual inductance by comparing the inner and outer products between voltages and currents. First, a torque and rotational speed of induction motor are estimated. Next, a mutual inductance parameter is got. Last, the proposed estimation method is verified by results of experiment.

关键词： Parameter estimation Induction motors Torque Valves Power system reliability Temperature sensors Sensor systems Voltage Inductance Inspection

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A Robust Bagging Method Using Median as a Combination Rule

A Robust Bagging Method Using Median as a Combination Rule

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IEEE International Conference on computer and Information technology Workshops, CIT

作者： Faisal Zaman Hideo Hirose Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Japan

Bagging has been known to be successful in increasing the accuracy of prediction of the unstable classifiers. In bagging predictors are constructed using bootstrap samples from the training sets and then aggregated to form a bagged predictor. The robust bagging discard the bootstrapped classifiers generating extreme error rates, as estimated by the out-of-bag error rate and to combine over the remaining ones using the robust location estimator,'median'. In this paper we try to explore the advantages of robust bagging. We carried out experiments on several benchmark data sets and suggest from the results that robust bagging performs quite similar compare to the standard bagging when applied to unstable base classifiers such as decision trees, but performs better when applied to more stable base classifiers as Fisher linear discriminant analysis and nearest mean classifier.

关键词： Robustness Bagging Classification tree analysis computer science systems engineering and theory Accuracy Error analysis Decision trees Machine learning algorithms Information technology

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Applying rough sets to information tables containing possibilistic values

Applying rough sets to information tables containing possibi...

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作者： Nakata, Michinori Sakai, Hiroshi Faculty of Management and Information Science Josai International University 1 Gumyo Togane Chiba 283-8555 Japan Department of Mathematics and Computer Aided Sciences Faculty of Engineering Kyushu Institute of Technology Tobata Kitakyushu 804-8550 Japan

ISBN: (纸本)354087562X

Rough sets are applied to information tables containing imprecise values that are expressed in a normal possibility distribution. A method of weighted equivalence classes is proposed, where each equivalence class is accompanied by a possibilistic degree to which it is an actual one. By using a family of weighted equivalence classes, we derive lower and upper approximations. The lower and upper approximations coincide with ones obtained from methods of possible worlds. Therefore, the method of weighted equivalence classes is justified. When this method is applied to missing values interpreted possibilistically, it creates the same relation for indiscernibility as the method of Kryszkiewicz that gave an assumption for indiscernibility of missing values. Using weighted equivalence classes correctly derives a lower approximation from the viewpoint of possible worlds, although using a class of objects that is not an equivalence class does not always derive a lower approximation. © 2008 Springer-Verlag Berlin Heidelberg.

关键词： Equivalence classes

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Utilizing Multi-Networks Task Scheduler for Streaming Applications

Utilizing Multi-Networks Task Scheduler for Streaming Applic...

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International Conference on Parallel Processing Workshops (ICPPW)

作者： Kazumi Yoshinaga Yoshiyuki Urantani Hiroshi Koide Graduate School of Computer Kyushu Institute of Technology Japan Kyushu Kogyo Daigaku Kitakyushu Fukuoka JP Faculty of Computer Science of Systems Engineering Kyushu Institute of Technology

This paper proposes and evaluates a new task scheduling method for parallel and distributed applications in an environment consisting of multiple networks having different characteristics. The proposed method can schedule both streaming applications and non-streaming applications effectively at the same time, since it selects the most suitable networks for the communications of tasks and considers the changing loads of the networks. The experimental results show the proposed method reduced the total execution time of a practical streaming application. The dispersion of the execution time was also suppressed even if the network bandwidth was dynamically changing. This characteristic is very important when this method is applied to more complicated task scheduling methods.

关键词： Processor scheduling Bandwidth Graphical user interfaces Servers Java Schedules Software

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Design of 600Mbps 4×2 MIMO-OFDM Wireless LAN system and Its FPGA Implementation

Design of 600Mbps 4×2 MIMO-OFDM Wireless LAN System and Its...

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International Conference on Advanced Communication technology (ICACT)

作者： Akihiro Teramoto Kunitoshi Nishijo Tadashi Maemura Yuhei Nagao Masayuki Kurosaki Hiroshi Ochi Kyushu Kogyo Daigaku Kitakyushu Fukuoka JP Graduate School of Computer Science and System Engineering Kyushu Institute of Technology Fukuoka Japan Department of Computer Science and Electronics Kyushu Institute of Technology Fukuoka Japan

This paper presents a model-based register transfer level (RTL) design of a 4times2 multiple-inputs multiple-outputs (MIMO)-orthogonal frequency domain multiplexing (OFDM) wireless communication systems transmitter and its field programmable gate array (FPGA) implementation. This system provides a maximum of 600 Mbps with 20 meter of propagation distance using 80 MHz baseband bandwidth with 4times2 MIMO scheme.

关键词： Wireless LAN Field programmable gate arrays Detectors Chromium Signal detection Cognitive radio Delay effects computer vision Radio spectrum management Frequency

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Query-trail-mediated topology reconstruction for exploring performance trade-off in unstructured P2P networks

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International Journal of Hybrid Intelligent systems 2008年第2期5卷 97-108页

作者： Ohnishi, Kei Nagamatsu, Satoshi Oie, Yuji Department of Computer Science and Electronics Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology 680-4 Kawazu Iizuka Fukuoka 820-8502 Japan

This paper presents a topology reconstruction method to explore better trade-off points between search and access load balancing performance in unstructured Peer-to-Peer (P2P) file sharing networks. The proposed topology reconstruction method changes a network topology in a dynamic, autonomous, and decentralized manner. The topology reconstruction is based on local threshold-based rules that use query trails, which stand for information on previous successful search paths. The scenario for the evaluation of the proposed method is that the topology reconstruction method consisting of the local threshold-based rules operates to explore the performance trade-off in the situation that new kinds of files are about to spread over a power-law network. The simulation results show that, depending on the setting of the threshold values, compared to the case without topology reconstruction, the proposed method can explore better trade-off points between search and storage access load balancing performance in the assumed scenario.

关键词： Unstructured P2P networks network topology topology reconstruction file sharing query-trail

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H loop shaping-based robust control design of PSS and TCSC for dynamic stability enhancement

H loop shaping-based robust control design of PSS and TCSC f...

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5th International Conference on Electrical engineering/Electronics, computer, Telecommunications and Information technology, ECTI-CON 2008

作者： Cuk Supriyadi, A.N. Ngamroo, I. Kaitwanidvilai, S. Kunakorn, A. Hashiguchi, T. Goda, T. Department of Electrical Engineering Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang Bangkok 10520 Thailand Department of Electrical and Electronic System Engineering Graduate School of Information Science and Electrical Engineering Kyushu University Fukuoka 819-0395 Japan

ISBN: (纸本)1424421012

In this paper, the robust control design of power system stabilizer (PSS) and thyristor controlled series capacitor (TCSC) for enhancement of power system dynamic stability is proposed. To take system uncertainties such as variations of system parameters, several loading conditions etc., into account, the normalized coprime factorization is used to represent unstructured uncertainties in the system. The H loop shaping technique is applied to design robust PSS and TCSC controllers. Simulation results in a single machine infinite bus system show that the performance and robustness of the proposed H controllers of PSS and TCSC are superior to those of the conventional PSS and TCSC. © 2008 IEEE.

关键词： Robust control

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Auxiliary objectives for the evolutionary multi-objective principal color extraction from logo images

Auxiliary objectives for the evolutionary multi-objective pr...

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Congress on Evolutionary Computation

作者： Mario Koppen Yutaka Kinoshita Kaori Yoshida Department of Artificial Intelligence Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Fukuoka Japan

In this paper, we present an approach to the selection of principal colors for the class of logo images. The approach is using multiple objectives that can be assigned to a color set, qualifying the selected colors as being principal colors of the image. Since all these objectives have a different preference, and have different computational complexity and granularity, it is not useful to put them all together into a single objective vector. Instead, a three stages procedure is proposed. The first stage optimizes only objectives of high relevance, and lower computational effort. Here, evolutionary multi-objective optimization is used. The second stage re-evaluates the Pareto set of the first stage according to an additional set of objectives. Finally, one solution of the Pareto set from the second stage is selected according to a single objective of highest preference. As suitable objectives for the first stage, the average minimum distance of the color set to the image pixels, together with the average number of pixel that are closer than a threshold have been found. The approach was studied on a number of logo images, and it could reconstruct the logo images of good visual quality from the found principal colors in the majority of the cases. The experiments also show that the result is usually improved by searching for more principal colors than are present in the logo image, and by repeating the process to find also small, but notable detail structures.

关键词： Image color analysis Pixel Distance measurement Optimization Image reconstruction Image segmentation Histograms

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Diagnosis of Realistic Defects Based on the X-Fault Model

Diagnosis of Realistic Defects Based on the X-Fault Model

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11th International Workshop on Design and Diagnostics of Electronic Circuits and systems (DDECS)

作者： Ilia Polian Kohei Miyase Yusuke Nakamura Seiji Kajihara Piet Engelke Bernd Becker Stefan Spinner Xiaoqing Wen Institute for Computer Science Albert Ludwig University Freiburg im Breisgau Germany Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Japan

Defects not described by conventional fault models are a challenge for state-of-the-art fault diagnosis techniques. The X-fault model has been introduced recently as a modeling technique for complex defect mechanisms. We analyze the performance of the X-fault diagnosis for a number of defect classes leading to highly complex circuit behavior on electrical level. Experiments performed using accurate resistive-bridge and interconnect-open simulators demonstrate the superiority of X-fault diagnosis over traditional methods.

关键词： Fault diagnosis X-fault model Resistive bridges Interconnect opens

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