Faculty Profiles - YAMAZAKI Tatsuya

Papers - YAMAZAKI Tatsuya

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A Study on Improving Image Quality of Highly Compressed Moving Pictures Reviewed

Tomio Goto, Tatsuya Yamazaki, Masaru Sakurai

2008 INTERNATIONAL SYMPOSIUM ON INFORMATION THEORY AND ITS APPLICATIONS, VOLS 1-3 1428 - 1433 2008

Language：English Publishing type：Research paper (international conference proceedings) Publisher：IEEE

Recently, the opportunity to treat images has increased. Most of the images are large, so they are usually compressed with JPEG and MPEG, which is a major compression standard. JPEG and MPEG use DCT (Discrete Cosine Transform) for transform. The DCT causes more and more blocky noise as the compression rate is set higher and higher. The images taken in the past axe usually strongly compressed. We propose a method of improving image quality using inverse wavelet transform. The proposed method transforms DCT coefficients into wavelet coefficients, decodes the coefficients by using inverse wavelet transform that selects the basis filters. The edge is protected by setting the threshold and controlling process, and improving image quality is aimed at.

Integration of Sensor Network and Energy Management System in Home and Regional Community Environments Reviewed

Tatsuya Yamazaki, Jaewook Jung, Youngjae Kim, Minsoo Hahn, Rui Teng, Yasuo Tan, Takashi Matsuyama

WMSCI 2008: 12TH WORLD MULTI-CONFERENCE ON SYSTEMICS, CYBERNETICS AND INFORMATICS, VOL II, PROCEEDINGS 2 276 - 279 2008

Language：English Publishing type：Research paper (international conference proceedings) Publisher：INT INST INFORMATICS & SYSTEMICS

Decreasing greenhouse gas emissions is one of the urgent issues that mankind is facing to. So far energy management systems (EMS) have been installed into a factory environment and good results have been obtained. In this paper, we propose to integrate sensor network systems and EMS to adapt to a heterogeneous home environment and to expand EMS enhanced by information and communication technologies to the level of regional community. Our proposal consists of four phases. A prototype development of the sensor network-based power monitoring and controlling system is presented to prove the effects of the first and second phases. Also two study cases are presented to support the third and forth phases of the proposed system.

Structuring Information on People and Environment for Supporting Robotic Services Reviewed

S. Nishio, N. Hagita, T. Miyashita, T. Kanda, N. Mitsunaga, M. Shiomi, T. Yamazaki

2008 IEEE/RSJ INTERNATIONAL CONFERENCE ON ROBOTS AND INTELLIGENT SYSTEMS, VOLS 1-3, CONFERENCE PROCEEDINGS 2637 - + 2008

Language：English Publishing type：Research paper (international conference proceedings) Publisher：IEEE

This paper proposes a new server platform for supporting various robotic services that interact with people. Every robot serving people in public spaces need to know: where the person is, what the person is doing, and what is happening at the place. The proposed platform is the first integrated system that can robustly measure, recognize and provide information on human activities and spatial nature in the environment, in a standard way. In the shopping mall experiment, the system is able to track and capture activities of more than 20 people simultaneously in real time. We also describe the result of robotic service experiment utilizing the power of this platform.

DOI： 10.1109/IROS.2008.4651198

Sharing of real-life experimental data in smart home and data analysis tool development Reviewed

Tatsuya Yamazaki, Tetsuo Toyomura

SMART HOMES AND HEALTH TELEMATICS 5120 161 - 168 2008

Language：English Publishing type：Research paper (international conference proceedings) Publisher：SPRINGER-VERLAG BERLIN

Collecting smart environment experimental data in a real situation and sharing the data are necessary to make the technologies used in the smart environment more practical. We have developed a data analysis tool for the real-life experiment data collected in a smart home environment. The subjects of the 16-day experimental data were a couple of husband and wife in their sixties. The data analysis tool as well as the collected data with the consent of the subjects are open for the purpose of research and development. In this paper, we introduce how the data were collected and the outline of the data analysis tool to promote interdisciplinary research and standardization activities in the field of smart environments.

DOI： 10.1007/978-3-540-69916-3_19

Game interface design guidelines to solve the dysfunction of an online game

Jaewook Jung, Minsoo Hahn, Tatsuya Yamazaki

21st International Symposium on Human Factors in Telecommunication, HFT 2008 359 - 366 2008

Publishing type：Research paper (international conference proceedings)

An online game is one of the most popular entertainments to the youth, but it affects physical, mental and social dysfunction to the youth as well as their family. The reason is that, even though, most of online games are not proper as a family entertainment, many young peoples like to play an online game. This paper suggests three guidelines for designing an online game interface to solve the dysfunction by changing an online game into a proper family entertainment. According to the suggested guidelines, the four directional waist movement based game interface was implemented and has been applied to the commercialized online game without the modification of the game software. The suggested interface has been verified at two times exhibitions. ©2008 HFT2008.

IMIS 2008 message from the workshop organizers MUE 2008

Seong Moo Yoo, Bonam Kim, Hui Huang Hsu, Ilsun You, Jong Hyuk Park, Minyi Guo, Ching Hsien Hsu, David Simplot-Ryl, Edwin H.M. Sha, Hai Jin, Javier Lopez, Shu Ching Chen, Tatsuya Yamazaki, Junmo Yang, Wen Tzeng Huang, Akiyo Nadamoto, Chengcui Zhang, Ching Sheng Wang, Chunming Rong, Frode Eika Sandnes, Geyong Min, Howard Leung, Hyobeom Ahn, Hyunju Kim, Indrakshi Ray, Isabelle Simplot-Ryl, Ismail Khalil Ibrahim, Javier García-Villalba, Jemal H. Abawajy, Jinhua Guo, Jon Youn, Kouichi Sakurai, Kuei Ping Shih, Lawrence Y. Deng, Mei Ling Shyu, Mohammad Al-Shurman, Oh Heum Kwon, Pedro M. Ruiz, Pilar Herrero, Q. Shi, Qun Jin, Seungjin Park, Sang Hyuk Son, Whai En Chen, Witold Pedrycz, Xiaofeng Chen, Yin Fu Huang

Proceedings - 2008 International Conference on Multimedia and Ubiquitous Engineering, MUE 2008 2008

Distributed and cooperative service platforms for home network services

Tatsuya Yamazaki, Atsushi Sawada, Toshikazu Nishimura, Masanori Takaoka, Yosuke Tajika, Michihiko Minoh

Journal of the National Institute of Information and Communications Technology 54 ( 3 ) 155 - 164 2007.9

Publishing type：Research paper (scientific journal)

In the UKARI (Universal Knowledgeable Architecture for Real-life appliances) project, we studied and developed distributed and cooperative service platforms for home network services, which provide services by cooperating functions from networked appliances (NAs). The NAs include consumer appliances as well as sensors, robots, and so on. Main research results were "UKARI-Core" and "UKARI-Kernel", which constitute the platforms. UKARI-Core is a middleware with must and core modules of distributed function cooperation. UKARI-Kernel is, moreover, another middleware as an extension of UKARI-Core with additional functions for flexible user adaptation. We implemented the middleware into various kinds of real appliances and constructed home network services in a real environment to evaluate the efficiency of the proposed service platforms.

Detection of people and tracking test bed using multiple sensors Reviewed

Tatsuya Yamazaki, Kentaro Kayama, Seiji Igi

MUE: 2007 International Conference on Multimedia and Ubiquitous Engineering, Proceedings 135 - 140 2007

Language：English Publishing type：Research paper (international conference proceedings) Publisher：IEEE COMPUTER SOC

In mobile and ubiquitous computing environments, acquisition of contextual information about a user situation is necessary to provide useful services. Although the definition of user context may change according to the situation or the service used, contextual information about who, where, and when are considered to be essential. We have built a test bed with multiple sensors: floor pressure sensors, RFID (radio frequency identification) tag systems, and cameras, to carry out experiments to detect the positions of users and track their movement. The test bed is described and experimental results are presented. By using the background subtraction method, which is conventional and effective, we found moving objects can be extracted under limited conditions in real time.

DOI： 10.1109/MUE.2007.119

Pervasive Computing for Quality of Life Enhancement, 5th International Conference On Smart Homes and Health Telematics, ICOST 2007, Nara, Japan, June 21-23, 2007, Proceedings Reviewed

ICOST 2007 4541 2007

An intelligent artifact as a cohabitant: An analysis of a home robot's conversation log

Naoko Matsumoto, Tatsuya Yamazaki, Akifumi Tokosumi, Hirotada Ueda

Second International Conference on Innovative Computing, Information and Control, ICICIC 2007 2007

Publishing type：Research paper (international conference proceedings)

This paper examines an unprecedented phenomenon in communication between human and intelligent artifacts within the home environment over the course of a 16 day-long experiment. We applied protocol analysis to analyze user utterances recognized by a voice recognition system on the home robot from the cognitive viewpoint. In this paper, two types of analysis have been conducted: (i) time-series analysis and (ii) analysis of differences in each room. The results indicate that (a) users get accustomed over time to the intelligent artifact and attachment emotions are elicited gradually with the passage of time, (b) users have gradually mixed cognition for the intelligent artifacts, which come to be recognized both as a cohabitant and as a tool, (c) users' complains have been counterbalanced with attachment emotions, and (d) users' cognition is different in each room and their cognition involving the intelligent artifacts would be also different. © 2007 IEEE.

DOI： 10.1109/ICICIC.2007.158

Special section on human communication II

Shinya Miyazaki, Tatsuya Yamazaki, Yoshimitsu Aoki, Kazunori Fujimoto, Atsushi Fukayama, Kiyoshi Hoshino, Masayuki Ihara, Kyoko Ito, Miyuki Kamachi, Yoshinari Kameda, Hirokazu Kato, Shinichi Kita, Mitsunori Matsushita, Akira Okamoto, Hiroko Shoji, Yugo Takeuchi, Tetsuya Watanabe, Yasuyuki Yanagida, Michihiko Minoh

IEICE Transactions on Information and Systems E89-D ( 6 ) 1767 - 1767 2006.6

Human action detection and context-aware service implementation in a real-life living space test bed Reviewed

Tatsuya Yamazaki

2006 2ND INTERNATIONAL CONFERENCE ON TESTBEDS AND RESEARCH INFRASTRUCTURES FOR THE DEVELOPMENT OF NETWORKS & COMMUNITIES 2006 274 - 279 2006

Language：English Publishing type：Research paper (international conference proceedings) Publisher：IEEE

After completion of a real-life living space test bed, the Ubiquitous Home, new sensors have been implemented. In this paper, new functions of the Ubiquitous Home and actual sensed data are presented. Since one of the purposes for the Ubiquitous Home is to evaluate the context-aware services in a real-life situation, a case of context-aware service implementation is also presented. For the service implementation, we have developed a network middleware for consumer appliances and sensors named "UKARI-Core". The outline of the UKARI-Core is described briefly.

DOI： 10.1109/TRIDNT.2006.1649162

Beyond the smart home Reviewed

Tatsuya Yamazaki

2006 International Conference on Hybrid Information Technology, Vol 2, Proceedings 2 350 - 355 2006

Language：English Publishing type：Research paper (international conference proceedings) Publisher：IEEE COMPUTER SOC

Due to progress in wired and wireless home networking, sensor networks, networked appliances, mechanical and control engineering, and computers, we can build smart homes, and many smart home projects are currently proceeding throughout the world. However, we have to be careful not to repeat the same mistake that was made with home automation technologies that were booming in the 1970s. That is, [total?] automation should not be a goal of smart home technologies. I believe the following points are important in construction of smart homes from users' viewpoints: development of interface technologies between humans and systems for detection of human intensions, feelings, and situations; improvement of system knowledge; and extension of human activity support outside homes to the scopes of communities, towns, and cities.

DOI： 10.1109/ICHIT.2006.253633

Elderly People Supporting Experiment in a Real-Life Environment Reviewed

Tatsuya Yamazaki

SMART HOMES AND BEYOND 19 149 - 156 2006

Language：English Publishing type：Research paper (international conference proceedings) Publisher：I O S PRESS

The National Institute of Information and Communications Technology of Japan completed a real-life test bed, called the "Ubiquitous Home," for home context-aware service experiments in 2004. Various kinds of sensors are installed in this test bed to collect residents' behavior data and comprehend their situation. Phyno, a dialogue-based interface robot, intermediates between the the Ubiquitous Home and the residents. Three kinds of context-aware services were implemented: TV program recommendation service, cooking recipe showing service and forgotten-property check service. We have conducted a real-life living experiment with a couple of husband and wife in their sixties to evaluate the context-aware services and Phyno's ability. In this paper, we introduce the Ubiquitous Home and Phyno briefly. After explanation of the implemented context-aware services, the experimental results are presented.

Emulator implementation of service scenario description framework for home networked appliances Reviewed

T Yamazaki, D Kwon, A Sawada, M Minoh

2005 JOINT INTERNATIONAL CONFERENCE ON AUTONOMIC AND AUTONOMOUS SYSTEMS AND INTERNATIONAL CONFERENCE ON NETWORKING AND SERVICES (ICAS/ICNS) 2005 23 - 28 2005

Language：English Publishing type：Research paper (international conference proceedings) Publisher：IEEE

A home network service middleware called "UKARl-Kernel" has been proposed for distributed and collaborative networked appliances and networked sensors. A home network service can be established by the middleware using distributed function elements on the networked appliances. The middleware uses a service scenario description framework on the basis of BPEL, an XML language to define business processes, to set up the service according to the present situation. In this paper, we describe the overview and of the home network service middleware and its service scenario description. Then implementation of an emulator for the set-vice scenario description framework is reported. It is noted that the proposed description framework can be constructed easily by using the existing toolkits.

DOI： 10.1109/ICAS-ICNS.2005.48

Networked Appliances Collaboration on the Ubiquitous Home Reviewed

Tatsuya Yamazaki, Hirotada Ueda, Atsushi Sawada, Yosuke Tajika, Michihiko Minoh

FROM SMART HOMES TO SMART CARE 15 135 - 142 2005

Language：English Publishing type：Research paper (international conference proceedings) Publisher：IOS PRESS

The National Institute of Information and Communications Technology of Japan completed a real-life test bed, called the "Ubiquitous Home," for home context-aware service experiments in 2004. Various kinds of sensors are installed in this test bed to collect residents' behavior data and comprehend their situation. At the Ubiquitous Home, experimenters can collect real-life data as if living in their own house, not in a laboratory. Variety of actuators and networked appliances are connected to the Ubiquitous Home. "UKARI-Core," a service platform for distributed and cooperative networked appliances, has also been developed to construct home network services using function elements of the networked appliances. The UKARI-Core has its own role-based functional description and function elements are categorized into defined types. One feature of the UKARI-Core is that it can find necessary function elements from plural different networked appliances via network to create a residential service dynamically and in ad hoc way. This paper introduces an overview of the Ubiquitous Home and the UKARI-Core and presents service examples realized at the Ubiquitous Home using the UKARI-Core.

Collaborative system construction with networked appliances and networked sensors

Tatsuya Yamazaki, Masaki Yamauchi, Yosuke Tajika

Second IEEE Workshop on Embedded Networked Sensors, EmNetS-II 2005 153 - 155 2005

Publishing type：Research paper (international conference proceedings)

A collaborative system with networked appliances and networked sensors has been developed at a real-life testbed. The networked appliances are connected by the middleware that establishes a service using distributed function elements on the networked appliances. The networked sensors are connected by IEEE802.15.4 and collaboratively work with the networked appliances. We will show a prototype implementation of the collaborative system. © 2005 IEEE.

DOI： 10.1109/EMNETS.2005.1469111

Ubiquitous home: real-life testbed for home context-aware service Reviewed

T Yamazaki

FIRST INTERNATIONAL CONFERENCE ON TESTBEDS AND RESEARCH INFRASTRUCTURES FOR THE DEVELOPMENT OF NETWORKS AND COMMUNITIES, PROCEEDINGS 2005 54 - 59 2004

Language：English Publishing type：Research paper (international conference proceedings) Publisher：IEEE COMPUTER SOC

The National Institute of Information and Communications Technology of Japan completed a real-life testbed, called the "ubiquitous home," for home context-aware service experiments in 2004. From the viewpoint of sensor ubiquity, the Ubiquitous Home is superior to other similar testbeds. At the Ubiquitous Home, experimenters can collect real-life data as if living in their own house, not in a laboratory. This paper introduces an overview and detailed sensor arrangement of the Ubiquitous Home. Two cases from several progressing experiments are also presented. The first case is on connecting networked appliances; the second concerns the combination of wearable devices and the Ubiquitous Home sensors to record user behavior

DOI： 10.1109/TRIDNT.2005.37

A study of QoS-based multimedia data retrieval systems

T. Yamazaki

IEEE International Symposium on Industrial Electronics I 485 - 489 2003

Publishing type：Research paper (international conference proceedings)

Multimedia applications that treat various types of data like videos, audios, and images are becoming popular amongst the Internet users. Assuming best-effort networks as the infrastructure, we are developing a multimedia data retrieval system based on QoS (quality of service) concept that searches and retrieves various types of multimedia data from plural multimedia data archives. As one of QoS parameters, we select the user's response time. Since the response time is related with network throughputs, throughput measurement becomes an important technology in the system. So far, we have developed a mechanism to decide a retrieval order of multimedia data that match with the user's searching request. The mechanism is called QoS scenario and it balances the user's searching request (keyword matching) and the QoS factor related with the user's response time that can be determined by the throughput measurement. The QoS scenario was used in the first version of our multimedia data retrieval system. In this paper, we study the active and passive throughput measurement technologies. Also, a multimedia data structure is introduced on the basis of the Dublin Core that has been standardized. Owing to the multimedia data structure, the system is able to hold interoperability and wide-area-network search and retrieval can be realized.

DOI： 10.1109/ISIE.2003.1267298

A multiagent reinforcement learning method based on the model inference of the other agents Reviewed

Yoichiro Matsuno, Tatsuya Yamazaki, Jun Matsuda, Shin Ishii

Systems and Computers in Japan 33 ( 12 ) 67 - 76 2002.11

Language：English Publishing type：Research paper (scientific journal)

This paper proposes a reinforcement learning method based on an actor-critic architecture, which can be applied to multiagent competitive games. As an example, we deal with the card game "Hearts." We introduce a method combining an actor-critic learning and model inference of the other agents. A single Hearts game is divided into three stages, and three actors are prepared so that one of them determines actions separately in each stage. In the middle stage, in particular, actions are determined based on expected temporal-difference error. Computer simulation results suggest the importance of the model inference of the other agents.

DOI： 10.1002/scj.10110

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