Faculty Profiles - YAMAZAKI Tatsuya

Papers - YAMAZAKI Tatsuya

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Quality of Experience Modeling with Psychological Effect for Interactive Web Services Reviewed

Tatsuya Yamazaki, Masato Eguchi, Takumi Miyoshi, Kyoko Yamori

2014 IEEE NETWORK OPERATIONS AND MANAGEMENT SYMPOSIUM (NOMS) 1 - 4 2014

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

Notion of the user-centered design (UCD) is requisite to improve user satisfaction. Matching the concept of UCD, Quality of Experience (QoE) is expected to become a paradigm shift from the existing operator-initiative network services. There are, however, several difficulties to realize practical communication services based on QoE. One difficulty is how to bridge QoE and Quality of Service (QoS) parameters relevant to system performance. Moreover, since QoE is based on the end-user subjective evaluation, flexible modeling corresponding to the end-user psychological status is needed. In this paper, an interactive Web service is considered and a QoE model with end-user psychological effect is derived by use of the Weber-Fechner law. Data of QoE and QoS parameter are collected through experiments and the mapping functions between QoE and QoS are estimated from the data.

DOI： 10.1109/NOMS.2014.6838398

QoE-driven Bandwidth Allocation Method Based on User Characteristics Reviewed

Huong Pham-Thi, Hiep Hoang-Van, Takumi Miyoshi, Tatsuya Yamazaki

2014 16th Asia-Pacific Network Operations and Management Symposium (APNOMS) 1 - 6 2014

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

Network providers are nowadays facing with a big question in allocating network resources due to the constantly increasing of Internet services. While the network resource is not unlimited, users always desire the best quality of experience (QoE) with the huge information exchange. Therefore, finding a justice of network resource allocation based on the user experience is mandatory. In previous studies, network resources were allocated to all users by using a specific utility function without considering the user characteristics. In fact, the network resource consumptions are very different among individual users and directly depend on users' behavior. For instance, the network demands of relax users are usually lower than those of busy users. Thus, allocating the same amount of resources to all users might not meet their expectations. In this paper, we propose two bandwidth allocation methods by classifying users into different groups based on their characteristics such as relax, short-time busy, and long-time busy users. To allocate the bandwidth in each group, specific utility functions are applied. By using these methods, the obtained results show that users get the different allocated bandwidth while they still experience the same level of QoE. On the other hand, the allocation considers users' behavior to allocate suitable bandwidth based on the real resource consumption of users. As a result from these analyses, our proposal tends toward a fair allocation as well as an efficient management of the network resources.

DOI： 10.1109/APNOMS.2014.6996518

Assistive technologies in smart homes

Tatsuya Yamazaki

Assistive Technologies: Concepts, Methodologies, Tools, and Applications 663 - 678 2013.8

Publishing type：Part of collection (book)

This book chapter provides a review of the assistive technologies deployed in smart spaces with a variety of smart home or house examples. In the first place, home networking technologies and sensing technologies are surveyed as fundamental technologies to support smart environment. After reviewing representative smart home projects from across the world, concrete assistive services related with the fundamental technologies in smart environment are deployed not only for the elderly and handicapped but for people in ordinary families as well. Adaptability is one of the key essences in the assistive technologies in smart environment and, for this purpose, human-ware studies including man-machine interfaces, ergonomics and gerontology are needed to be linked with the hardware specific fundamental technologies.

DOI： 10.4018/978-1-4666-4422-9.ch032

Special Section on Quality of Communication Services Improving Quality of Life FOREWORD Reviewed

Tatsuya Yamazaki

IEICE TRANSACTIONS ON COMMUNICATIONS E96B ( 2 ) 391 - 391 2013.2

Foreword. Reviewed

Tatsuya Yamazaki

IEICE Transactions 96-B ( 2 ) 391 2013

Tatsuya Yamazaki

IEICE Trans. Commun. 96-B ( 2 ) 391 - 391 2013

A service quality coordination model bridging QoS and QoE Reviewed

Tatsuya Yamazaki, Takumi Miyoshi, Masato Eguchi, Kyoko Yamori

IEEE International Workshop on Quality of Service, IWQoS 1 - 4 2012

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

Both of Quality of Service (QoS) and Quality of Experience (QoE) are defined to specify the degree of service quality. Although they are dealt with in different layers in multi-layered models, collaboration of these is necessary to improve the user satisfaction for telecommunication services. In this paper, after sorting out the concepts and specification of QoS and QoE, a service quality coordination model combining these is proposed. The model is applied to a video-sharing service and its coordination model is derived based on subjective experiments. The structural equation modeling is used to compute the user satisfaction from QoS and QoE. © 2012 IEEE.

DOI： 10.1109/IWQoS.2012.6245977

Communicative Robot Interface for the Ageing Society Reviewed

Tatsuya Yamazaki

2012 12TH INTERNATIONAL CONFERENCE ON CONTROL, AUTOMATION, ROBOTICS & VISION (ICARCV) 668 - 671 2012

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

Supporting the elder people's independent life is needed for the imminent ageing societies. Assistance should be provided from both physical and cognitive aspects. The houses enhanced by use of ICT (Information and Communication Technology) are called smart homes and they proved to be useful for physical assistance for the elder persons. Communication is important to improve elderly people's moods and interactive robots are another promising ICT to provide mental or cognitive support for the elder people. In this paper, effects of the interactive robots are evaluated based on a real-life experiment with a couple of husband and wife in their sixties. The impression of the interactive robots is analyzed based on the score of SD (Semantic Differential) method.

DOI： 10.1109/ICARCV.2012.6485237

A POWER CONSUMPTION ACTIVITY BASED HETEROGENEOUS SOA FRAMEWORK FOR CONTEXT-AWARE HOME SERVICES Reviewed

Hyun Sang Cho, Takekazu Kato, Tatsuya Yamazaki, Minsoo Hahn

JOURNAL OF CIRCUITS SYSTEMS AND COMPUTERS 20 ( 7 ) 1211 - 1230 2011.11

Language：English Publishing type：Research paper (scientific journal) Publisher：WORLD SCIENTIFIC PUBL CO PTE LTD

The home network is one of the emerging areas from the last century. However, the growth of the home network market is stationary at present. This paper describes the limitations of the home network system and the requirements for overcoming the current limitations. Also described is a new home network service system known as COWS and its easy installation and scalable operation. COWS consists of power consumption monitor and control devices along with a service server that is a complementary combination of Open Service Gateway initiative (OSGi) and web services. A home network system has a dynamic, heterogeneous, distributed, and scalable topology. Service Oriented Architecture (SOA) has been proposed as a solution that satisfies the requirement of a home network, and OSGi and web services are two successful SOA-based frameworks. An included service server has a flexible architecture that consists of a core and extendable service packages. A power consumption monitor and control function provides useful context information for activity-based context-aware services and optimizes the power consumption. The system can be installed easily into existing and new houses to solve the current barrier of the popularization of home network services.

DOI： 10.1142/S0218126611007840

Bandwidth-efficient media access protocol for wireless feedback control in home energy networks Reviewed

Rui Teng, Tatsuya Yamazaki, Kiyoshi Hamaguchi

IEEE International Conference on Communications 2011

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

Home energy networks require the integration of networked sensing with networked control for energy monitoring and management. Shared communication media for sensing and control is easy to be configured but introduces the delay and packet loss. This paper studies the Media Access Control (MAC) layer support of reliable wireless feedback control and flexible sensing in home networks. We discuss the problem of large bandwidth requirement of reliable feedback control in the limited bandwidth of the shared network media. We propose a dynamic bandwidth assignment approach that fits the reliability requirement of feedback control and enables a high bandwidth utilization to solve the problem. The simulation results reveal that FCMA can achieve high bandwidth efficiency with low packet losses. © 2011 IEEE.

DOI： 10.1109/iccw.2011.5963576

Implementation of Daily Activity Management Service System with Smart Grid Reviewed

Hyun Sang Cho, Tatsuya Yamazaki, Sung Eun Kim, Minsoo Hahn

AGING FRIENDLY TECHNOLOGY FOR HEALTH AND INDEPENDENCE 6159 230 - + 2010

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

Health management is fundamental to enabling elderly people to 'age in place' in their homes, and health care services can help elderly people to manage their health. The number of elderly people who require such care services is increasing rapidly, causing a parallel rise in the need for expert care providers. One of the solutions to this demand for expert care is an automatic health care system that may be integrated into a residence, but installing and operating such systems can be prohibitively expensive. To solve this issue, a cost-effective activity monitoring based health care system is proposed in this study. The system uses the infrastructure of a smart grid and a home network system in order to reduce the costs of installation and operation.

DOI： 10.1007/978-3-642-13778-5_30

QoS Supported MAC for Arbitrary Networked Control in Home Networks Reviewed

Rui Teng, Tatsuya Yamazaki, Kiyoshi Hamaguchi

2ND IEEE INTERNATIONAL CONFERENCE ON ADVANCED COMPUTER CONTROL (ICACC 2010), VOL. 1 1 460 - 464 2010

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

Home appliances can be connected in a ubiquitous manner by communication networks. In addition to the operation sensing of home appliances, appliance management via sending control messages will be needed. The control operations include power adjustment of home appliances and sampling rate change of a sensing device. It should be noted that control messages differ from sensing data and the former generally require more reliability. In this paper, we study the delay performance of control messages at MAC (Media Access Control) layer in the network with shared communication media. The proposed approach can confine the delay uncertainty of the control messages within a specified tolerant time for respective appliance.

DOI： 10.1109/ICACC.2010.5487149

SNMP-based Computer Resource Usage Monitoring System for Energy Conservation in Office Environment Reviewed

Seungwon Oh, Minsoo Hahn, Tatsuya Yamazaki

2010 INTERNATIONAL COLLOQUIUM ON COMPUTING, COMMUNICATION, CONTROL, AND MANAGEMENT (CCCM2010), VOL III 280 - 282 2010

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

We propose a SNMP-based Computer Resource Usage Monitoring System (CRUMS) to reduce computer power consumption in office environment. This system suggests the efficient method for the power management service included in operating system without complex operation processes or additional devices. To achieve this, the proposed system monitors the information of computer hardware resource usage from each computer connected by office network using SNMP. By considering the resource usage data, the system can minimize not only computer power consumption but inconvenience to users. The result of our experiment shows the value of the system and proves the effectiveness in conserving energy in office environment.

Bit-Watt Home System with Hybrid Power Supply Reviewed

Rui Teng, Tatsuya Yamazaki

2010 2ND INTERNATIONAL CONFERENCE ON COMPUTER AND AUTOMATION ENGINEERING (ICCAE 2010), VOL 5 5 59 - 63 2010

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

This paper introduces a basic architecture of BitWatt home system, one target of which is to optimize the energy consumption of home appliances. The Bit-Watt system consists of intelligent home appliances, a home energy server, and hybrid power supplies. We introduce an energy cost model and propose a proactive energy management approach for the home system. The proposed approach applies time-shift operation to home appliances according to the cost of power supplies. We evaluate the performance of energy management by computer simulation. The simulation result reveals that the proposed approach enables the optimization of energy cost in the home system with hybrid power supplies.

DOI： 10.1109/ICCAE.2010.5451519

Simple and Robust Method for Detecting the Electrical Appliances Using Markers and Programmable Logic Devices Reviewed

Hyun Sang Cho, Minsoo Hahn, Takekazu Kato, Tatsuya Yamazaki

ISCE: 2009 IEEE 13TH INTERNATIONAL SYMPOSIUM ON CONSUMER ELECTRONICS, VOLS 1 AND 2 407 - + 2009

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

The detection of appliances and their location is important for the efficient management and automatic operation of appliances and their power consumption. In this paper, we describe a simple and robust method of detecting appliances based on their location by using programmable logic devices (PLDs). The results of simulation and implementation are also included.

Life with a Robot Companion: Video Analysis of 16-Days of Interaction with a Home Robot in a "Ubiquitous Home" Environment Reviewed

Naoko Matsumoto, Hirotada Ueda, Tatsuya Yamazaki, Hajime Murai

HUMAN-COMPUTER INTERACTION, PT II 5611 ( PART 2 ) 341 - + 2009

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

This paper examines human-robot interaction within a home environment over the Course of a 16 day-long experiment. Its purpose is to describe the human cognitive activities involving a symbiotic robot with dialogue interface within domestic settings. The participants were a couple in their 60's. Analysis of video data indicates that (a) the participants continuously used the robot's dialogue interlace, and persevered within this despite the performance of the voice recognition system (b) the participants checked out the robot's function as a tool and gradually came to regard the robot as a companion, (c) fixed instruction expressions increased the use of the dialogue interface for the light controls, while the participants employed both the dialogue interface and the remote controller for the TV and light controls.

DOI： 10.1007/978-3-642-02577-8_37

Simple and robust method for detecting the electrical appliances using markers and programmable logic devices Reviewed

Sang Cho Hyun, Hahn Minsoo, Takekazu Kato, Tatsuya Yamazaki

Digest of Technical Papers - IEEE International Conference on Consumer Electronics 334 - 338 2009

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

The detection of appliances and their location is important for the efficient management and automatic operation of appliances and their power consumption. In this paper, we describe a simple and robust method of detecting appliances based on their location by using programmable logic devices (PLDs). The results of simulation and implementation are also included. ©2009 IEEE.

DOI： 10.1109/ISCE.2009.5156906

Activity-based computing Reviewed

Nigel Davies, Daniel P. Siewiorek, Rahul Sukthankar

IEEE PERVASIVE COMPUTING 7 ( 2 ) 20 - 21 2008.4

A home sensor network that controls power consumption Reviewed

Jaewook Jung, Youngiae Kim, Minsoo Hahn, Tatsuya Yamazaki, Tetsuo Toyomura, Takashi Matsuyama

IEEE PERVASIVE COMPUTING 7 ( 2 ) 60 - 60 2008.4

Sense Cup: A Design of a New Interactive Holistic Sense Convergence Device for Digital Storytelling Reviewed

Hyun Sang Cho, Soohyun Lim, Tatsuya Yamazaki, Minsoo Hahn

ENTERTAINMENT COMPUTING - ICEC 2008 5309 173 - + 2008

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

In this paper, we propose "Sense cup" as a new design concept of a device for enhancing the digital storytelling by serving interactive five senses convergence experience. We designed the cup for providing holistic sense experiences with beverage that synchronized with digital contents such as movies and music and catch the user reaction to generate interaction between users and contents provider.

DOI： 10.1007/978-3-540-89222-9-20

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