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作者： Takaoka, Masanori Uchida, Masato Ohnishi, Kei Oie, Yuji NCOS Laboratory NEC Communication Systems 1753 Shimonumabe Nakahara-ku Kawasaki Kanagawa 211-8666 Japan Department of Electrical Electronics and Computer Engineering Faculty of Engineering Chiba Institute of Technology 2-17-1 Tsudanuma Narashino-shi Chiba 275-0016 Japan Graduate School of Computer Science and System Engineering Kyushu Institute of Technology 680-4 Kawazu Iizuka Fukuoka 820-8502 Japan

We propose a generalised diffusion-based file replication scheme for load balancing in unstructured P2P file-sharing networks. The generalised method is derived by replacing the replication probability of a peer used in our previous study with a new expression. In the previous expression, the replication probability is defined to be proportional to the difference between its own load and the average load of its neighbour peers. We show here that the replication probability can instead be expressed as a simple average of one defined to be negatively proportional to its own load and one defined to be proportional to the average load of its neighbour peers. The generalised method (a) includes the above three methods as special cases, (b) can control the trade-off between search and load balancing performances, (c) has a physical analogy to diffusion phenomena, and (d) achieves a good balance in the trade-off differently from our previous method. Copyright © 2012 Inderscience Enterprises Ltd.

关键词： Economic and social effects

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Derivation of Log-Likelihood Ratio for M-Ary Non-Orthogonal FSK Wireless system

Derivation of Log-Likelihood Ratio for M-Ary Non-Orthogonal ...

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IEEE Conference on Vehicular technology (VTC)

作者： Daisuke Nojima Yuhei Nagao Masayuki Kurosaki Hiroshi Ochi Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Fukuoka Japan

In a soft decision Viterbi decoder, the log-likelihood ratio (LLR) metric is used to improve the performance of the error correction. On linear systems under additive white gaussian noise channel, this is straightforward as the error distribution at the input of the Viterbi decoder is also gaussian. In non-linear systems such as the M-ary non-coherent non-orthogonal frequency shift keying (FSK), this is generally not true. However, non-orthogonal non-coherent FSK LLR has not yet been proposed in literature. In this paper we derived the LLR for the M-ary non-orthogonal FSK mathematically and verified it using simulations.

关键词： Frequency shift keying Viterbi algorithm Decoding Wireless communication Random variables Fading Signal to noise ratio

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Editing the Visual Properties of Collaborative KJ Diagram Decoration by User-Defined Handwritten Gestures

Editing the Visual Properties of Collaborative KJ Diagram De...

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IEEE International Workshop on Wireless, Mobile and Ubiquitous technology in Education (WMUTE)

作者： Takahiro Nyu Motoki Miura Department of Applied Science for Integrated System Engineering Kyushu Institute of Technology Japan Department of Basic Sciences Faculty of Engineering Kyushu Institute of Technology Japan

The process of collaborative creative work and the ability to record and circulate the results are important. Previously, we had proposed a label capturing system for the group KJ method that uses Anoto-based pens. The system instantly digitizes the position and content of each label containing ideas and thoughts, and then it generates KJ diagrams for distribution. The users can also edit the visual properties of the KJ diagrams by writing gestures with their pens on target labels. However, the system could only accept pre-defined gestures, and the users could not register their own patterns. In order to eliminate these restrictions, we introduce a mechanism to register user-defined gesture commands. After users register their original gestures, they can change the appearance of labels with their favorite pen movements. By applying the mechanism to our group KJ system, the user's experience and understanding of the system are improved.

关键词： Visualization Registers Image color analysis Color Collaborative work Collaboration Usability

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Harmonics reduction of three phase five-level Neutral-Point-Clamped Multilevel Inverter

Harmonics reduction of three phase five-level Neutral-Point-...

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2012 IEEE International Conference on Power and Energy, PECon 2012

作者： Mailah, Nashiren Farzilah Othman, Sh. Sakinah Tuan Aris, Ishak Norhisam, M. Abdul Kadir, M.Z.A. Tsuyoshi, Hanamoto Hiroaki, Yamada Department of Electrical and Electronic Enginering Faculty of Engineering Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia Graduate School of Life Science and System Engineering Kyushu Institute of Technology Hibikino Wakamatsu-ku Kitakyushu 808-0196 Japan

ISBN: (纸本)9781467350198

This paper presents the development of a 5-level Neutral-Point-Clamped Multilevel Inverter (NPCMI) simulation model. Based on the desired output voltage profile and switching states of the multilevel inverter, the triggering signals are calculated and determined. The best values of these signals are then chosen for the triggering angle and duration for each switch where a low Total Harmonics Distortion (THD) of output voltage is obtained. © 2012 IEEE.

关键词： Electric inverters

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Performance evaluation for multi-user MIMO IEEE 802.11ac wireless LAN system

Performance evaluation for multi-user MIMO IEEE 802.11ac wir...

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International Conference on Advanced Communication technology (ICACT)

作者： Daisuke Nojima Leonardo Lanante Yuhei Nagao Masayuki Kurosaki Hiroshi Ochi Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka Fukuoka Japan

In this paper, we evaluate the performance of the next generation standard IEEE 802.11ac wireless local area network (WLAN) system. IEEE 802.11 for the first time will employ downlink multi-user multi-input multi-output (MU-MIMO) technology. Precoding techniques greatly influences the performance of MU-MIMO transmission. We measure these improvements when realistic channel conditions are applied. We compare the performance of channel inversion (CI) and block diagonalization (BD) precoding methods paired with various MIMO detection techniques. From the simulation results, we show the effectiveness of BD precoding compared to CI precoding.

关键词： Modulation Radio access networks Transmitting antennas Wireless communication

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Neurofeedback for the treatment of schizophrenia: Case study

Neurofeedback for the treatment of schizophrenia: Case study

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2012 10th IEEE International Conference on Virtual Environments, Human-computer Interfaces, and Measurement systems, VECIMS 2012

作者： Nan, Wenya Chang, Lanshin Rodrigues, Joao Pedro Wan, Feng Mak, Peng Un Mak, Pui-In Vai, Mang I. Rosa, Agostinho Department of Electrical and Computer Engineering Faculty of Science and Technology University of Macau China Department of Psychology Faculty of Social Sciences and Humanities University of Macau China Department of Bioengineering LaSEEB-System and Robotics Institute Technical University of Lisbon Portugal

ISBN: (纸本)9781457717574

The paper presents a case report of the therapy by neurofeedback training of a chronic female schizophrenia outpatient. The purpose of the neurofeedback training was to enhance cognition, memory and behavioral performance. We used an intensive approach. All the training sessions were performed during 4 consecutive days. The results showed that the patient learnt to increase individual alpha amplitude and simultaneously decrease beta2 (20-30 Hz) amplitude at P4 site during active state over sessions. The individual alpha increased 74.73% and beta2 decreased 13.73%. The short term memory was enhanced after training. Her mood had positive change and her speech was much clearer than before. She started to associate the meaning of her life and illness. These results support that neurofeedback is not only a feasible therapy for schizophrenia but also positive results could be obtained using a much more intensive training sessions than the one reported in the literature. © 2012 IEEE.

关键词： Neurofeedback Schizophrenia activity state Hercules

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Evaluation of gesture-command input method for pen-based group KJ system

Frontiers in Artificial Intelligence and Applications

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Frontiers in Artificial Intelligence and Applications 2012年 243卷 1857-1866页

作者： Nyu, Takahiro Department of Applied Science for Integrated System Engineering Graduate School of Engineering Japan Department of Basic Sciences Faculty of Engineering Kyushu Institute of Technology Japan

ISBN: (纸本)9781614991045

The processes involved in carrying out collaborative creative work and the ability to record and circulate the results are important. Previously, we proposed a label-capturing system for the group KJ method that uses anoto-based pens. The system instantly digitizes the positions and contents of labels containing ideas and thoughts, and then generates KJ diagrams for distribution. We also proposed a method for editing the visual properties of KJ diagrams using pen-writing gestures with physical transparent sheets on target labels. However, when the number of functions increases, the management of the physical transparent sheet becomes difficult. In this study, we verified the suitability of the system by introducing a user-defined gesture command framework. This framework increases the flexibility of user operation as well as the number of functions acceptable by the system. We confirmed the suitability through preliminary evaluation of the system with respect to recognition. © 2012 The authors and IOS Press. All rights reserved.

关键词： Function evaluation

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A Comparison of CP, IP, and SAT Solvers through a Common Interface

A Comparison of CP, IP, and SAT Solvers through a Common Int...

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International Conference on Tools for Artificial Intelligence (ICTAI)

作者： Neng-Fa Zhou Masato Tsuru Eitaku Nobuyama Brooklyn College & Graduate Center City University of New York USA Faculty of Computer Science & System Engineering Kyushu Institute of Technology Japan

This paper presents a common interface for Prolog to three different types of discrete solvers including Constraint Programming (CP), Integer Programming (IP), and SAT solvers. The interface comprises primitives for creating decision variables, specifying constraints, and invoking a solver, possibly with an objective function to be optimized. Before a solver is actually called, the accumulated variables and constraints are transformed into a form acceptable to the solver. For a SAT solver, in particular, variables are Booleanized and constraints are compiled into CNF. Implemented in B-Prolog, the interface allows the programmer to use the features of the host language such as recursion, pattern matching, arrays, and loops to describe problems. The interface provides an easy and uniform platform for exploring different solvers and models. This paper compares the performance of the CLP(FD) of B-Prolog, the CPLEX IP solver, and the Lingeling SAT solver on several problems through the same interface and for each problem it compares a model that uses Boolean variables and another model that uses general integer variables. Our experience tells that it is effortless to switch from one solver to another.

关键词： Color IP networks Linear programming Mathematical model Educational institutions Programming Pattern matching

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A science cloud for data intensive sciences

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Data science Journal 2013年 12卷 WDS139-WDS146页

作者： Murata, Ken T. Watari, Shinichi Nagatsuma, Tsutomu Kunitake, Manabu Watanabe, Hidenobu Yamamoto, Kazunori Kubota, Yasufumi Kato, Hisao Tsugawa, Takuya Ukawa, Kentaro Muranaga, Kazuya Kimura, Eizen Tatebe, Osamu Fukazawa, Keiichiro Murayama, Yasuhiro 4-2-1 Nukui-kita Koganei Tokyo 184-8795 Japan Systems Engineering Consultants Co. Ltd. 4-10-1 Yoga Setagaya Tokyo 158-0097 Japan Dept. Medical Informatics of Medical School of Ehime Univ. Situkawa Toon City Ehime 791-0295 Japan Dept. Computer Science Univ. of Tsukuba Tenoudai 1-1-1 Tsukuba Science City Ibaraki 305-8573 Japan Research Institute for Information Technology Kyushu University 6-10-1 Hakozaki Higashi-Ku Fukuoka 812-8581 Japan Integrated Science Data System Research Lab NICT 4-2-1 Nukui-kita Koganei Tokyo 184-8795 Japan

It is often discussed that the fourth methodology for science research is "informatics". The first methodology is a theoretic approach, the second one is observation and/or experiment, and the third one is computer simulation. Informatics is a new methodology for data intensive science, which is a new concept based on the fact that most scientific data are digitalized and the amount of data is huge. The facilities to support informatics are cloud systems. Herein we propose a cloud system especially designed for science. The basic concepts, design, resources, implementation, and applications of the NICT science cloud are discussed.

关键词： Digital storage

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Consideration on the relationship between changes in learners' learning preferences and the differences in e-learning modes of a course

Frontiers in Artificial Intelligence and Applications

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Frontiers in Artificial Intelligence and Applications 2012年 243卷 1121-1130页

作者： Nishino, Kazunori Mayumi, Tetsuo Iribe, Yurie Mizuno, Shinji Ogawa, Nobuyuki Yajima, Kuniaki Aoki, Kumiko Fukumura, Yoshimi Kyushu Institute of Technology Faculty of Computer Science and Systems Engineering 680-4 Kawazu Iizuka Fukuoka 820-8502 Japan

ISBN: (纸本)9781614991045

This paper investigates how the three e-learning modes (traditional, room-based synchronous, and metaverse-based) affect the learners' learning preferences before and after completing the study. The authors found out that the students who took the rooom-based synchronous e-learning mode tended to show the low course adaptability overall while their preferences for asynchronous learning and the use of information and communication technologies (ICT) changed negatively after completing the study. In addition, the students' preferences for asynchronous learning as well as the use of ICT turned negative after completing the study in the metaverse-based environment. © 2012 The authors and IOS Press. All rights reserved.

关键词： E-learning

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