Updated on 2024/03/29

写真a

 
IMAI Hiroei
 
Organization
Headquarters for Management Strategy University Evaluation Center Associate Professor
Institute for Digital Transform Promotion Center for Academic Information Service Associate Professor
Title
Associate Professor
External link

Degree

  • 博士(工学) ( 1998.3   新潟大学 )

  • 修士(工学) ( 1995.3   新潟大学 )

Research Areas

  • Informatics / Computer system

Research History (researchmap)

  • Niigata University   Headquarters for Management Strategy University Evaluation Center   Associate Professor

    2007.4

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  • Niigata University   Headquarters for Strategy and Planning University Evaluation Center   Associate Professor (as old post name)

    2007.3

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  • Niigata University   Faculty of Engineering Department of Information Engineering   Assistant

    2003.4 - 2007.1

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  • Niigata University   Graduate School of Science and Technology   Assistant

    1998.4 - 2003.3

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Research History

  • Niigata University   Associate Professor

    2021.4

  • Niigata University   Associate Professor

    2015.4

  • Niigata University   Headquarters for Strategy and Planning University Evaluation Center   Associate Professor

    2007.4 - 2015.3

  • Niigata University   Headquarters for Strategy and Planning University Evaluation Center   Associate Professor (as old post name)

    2007.3

  • Niigata University   Faculty of Engineering Department of Information Engineering   Research Assistant

    2003.4 - 2007.1

  • Niigata University   Graduate School of Science and Technology   Research Assistant

    1998.4 - 2003.3

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Education

  • Niigata University   Faculty of Engineering

    - 1993.3

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    Country: Japan

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Papers

  • 路上空間を用いた無線マルチホップネットワークのリレーノード配置方式 Reviewed

    今井博英, 間瀬憲一, 岡田啓, 中野敬介

    電子情報通信学会論文誌B   J99-B ( 10 )   871 - 880   2016.10

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  • Triage Information Transmission System Using Specified Low Power Radio and Satellite Phones Reviewed

    KAMEI Shuichi, ITO Tatsuya, IMAI Hiroei, NISHIMORI Kentaro, TAKAHASHI Masashi, KINOSHITA Hidenori, MAKINO Hideo

    The transactions of the Institute of Electronics, Information and Communication Engineers. B   J95B ( 11 )   1435 - 1445   2012.11

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  • 小型端末を用いたトリアージ情報の管理・配信システム

    伊藤達哉, 牧野秀夫, 今井博英, 山本峻, 亀井秀一, 畑中将輝, 土屋裕, 小林二朗, 高橋昌, 木下秀則

    電子情報通信学会大会2011年総合大会,CD-ROM   B ( 20 )   43   2011.3

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  • An Evaluation Method for Delay Time and Its Jitter of WLAN using a GSPN Model Reviewed

    Masahiro Tsunoyama, Hiroei Imai

    2008 IEEE 33RD CONFERENCE ON LOCAL COMPUTER NETWORKS, VOLS 1 AND 2   791 - +   2008

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

    This paper proposes a method for evaluating mean delay time and its standard deviation (jitter) of wireless local area networks (WLAN) using Generalized Stochastic Petri Nets (GSPN). The WLAN is modeled using GSPN and the mean delay time and its jitter are calculated using equations derived from the Markov chain associated with the GSPN model. The method is applied to evaluate delay time and its jitter for 802.11e WLAN. The results reveal that the values calculated based on the equations agree well with the values obtained from simulations.

    DOI: 10.1109/LCN.2008.4664285

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  • GSPNを用いた無線LANの性能評価の方法について

    樋口達也, 今井博英, 角山正博, 牧野秀夫

    電子情報通信学会信越支部大会,講演論文集   92 - 92   2007.9

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  • 大規模災害時における避難所への物資分配方法について

    渡辺雅史, 今井博英, 角山正博, 牧野秀夫

    電子情報通信学会信越支部大会,講演論文集   68 - 68   2007.9

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  • GSPNによる無線LANのモデル化

    樋口達也, 今井博英, 角山正博, 牧野秀夫

    電子情報通信学会大会2007年総合大会,名城大学   2007.3

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  • OLSRv2 implementation and performance evaluation with link layer feedback Reviewed

    Yasunori Owada, Taka Maeno, Hiroei Imai, Kenichi Mase

    IWCMC 2007: Proceedings of the 2007 International Wireless Communications and Mobile Computing Conference   67 - 72   2007

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    OLSRv2 is being standardized in the IETF MANET (Mobile Ad hoc Network) working group. OLSRv2 uses the common packet format, that is also being standardized in the MANET WG. It is necessary to validate the OLSRv2 protocol specification by implementing OLSRv2. In addition, OLSRv2 has a great capability to reduce message size compared to OLSR. This is due to address compression. The change of control message size directly affects the total network performance, but how much it affects the various parameters are dependent on the network scale, number of nodes, and address compression implementation. In this context, we have implemented the OLSRv2 protocol, which can run as a real-time protocol or in the QualNet simulator. In addition, we added link disconnection feedback function from MAC layer to OLSRv2 modifying wireless LAN device driver. In this paper our OLSRv2 implementation detail is introduced, and OLSRv2 performance is compared with OLSR by using both a 50 node testbed built in Niigata university and also in the Qualnet simulator. In addition, IP address compression effect is analyzed in the simulator, and the performance of OLSRv2 with link layer disconnection feedback is evaluated in the testbed. Copyright 2007 ACM.

    DOI: 10.1145/1280940.1280955

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  • An Proposal of Multihop-Wireless LAN and Its Implementation Reviewed

    OWADA Yasunori, TERUI Hiroyasu, MASE Kenichi, IMAI Hiroei

    The IEICE transactions on communications B   89 ( 11 )   2092 - 2102   2006.11

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    Other Link: http://hdl.handle.net/10191/9089

  • Approximation Method for Probability Distribution Functions by Coxian Distribution considering Feature of its Density Function Reviewed

    Sasaki Yukie, Imai Hiroei, Tsunoyama Masahiro, Ishii Ikuo

    28 ( 3 )   205 - 218   2006.5

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

    DOI: 10.11348/reajshinrai.28.3_205

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  • A Geometric Calibration Method of Internal Camera Parameter for Fish-Eye Lenses

    Komagata Hideki, Ishii Ikuo, Takahashi Akira, Wakatsuki Daisuke, Imai Hiroei

    J89-D ( 1 )   64 - 73   2006

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  • An agent based model on the bully of mobbed classmates Reviewed

    Y. Maeda, H. Imai

    The IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences   J88-A ( 6 )   722 - 729   2005.6

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Institute of Electronics, Information and Communication Engineers  

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    Other Link: http://hdl.handle.net/10191/6536

  • Approximation of Probability Distribution Functions by Coxian Distribution to Evaluate Multimedia Systems Reviewed

    Yukie Sasaki, Hiroei Imai, Masahiro Tsunoyama, Ikuo Ishii

    Systems and Computers in Japan   35 ( 2 )   16 - 24   2004.2

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    It has been reported in several studies that the probability distribution functions for interarrival times of tasks in multimedia systems cannot be represented by traditional probability distribution functions, such as exponential ones. In this paper we propose an approximation method, based on the Coxian distribution function, to calculate the probability distribution functions used in analyzing multimedia systems. Although the Coxian function can represent arbitrary distribution functions, it is difficult to determine their parameters directly from a given distribution function. In this work, this drawback is remedied by first approximating the given distribution function with a linear combination of Erlang function, and then converting it to a Coxian function. We also present examples of the approximation and evaluate its accuracy. ©2004 Wiley Periodicals, Inc.

    DOI: 10.1002/scj.10446

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  • Approximation method for probability distribution functions by Coxian distribution Reviewed

    Y Sasaki, H Imai, Ishii, I, M Tsunoyama

    Advanced Reliability Modeling   427 - 434   2004

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:WORLD SCIENTIFIC PUBL CO PTE LTD  

    This paper provides an extension of the approximation method proposed in the literature [1]-[2], using the Coxian distribution. In the existing method, the probability distribution functions with the monotonic decreasing property can be approximated. The method proposed in this paper uses the combination of hyper-exponential distribution and Erlang distributions, and enables to approximate non-monotonous distributions. We also present some examples to show the usefulness of the approximate method.

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  • A High Reality Drawing Method for VR Objects with Details Structure in Consideration of Shape Recognition Characteristics of Observers Reviewed

    WAKATSUKI Daisuke, ISHII Ikuo, TAKAHASHI Akira, IMAI Hiroei, MAKINO Hideo

    The Transactions of the Institute of Electronics, Information and Communication Engineers A   J86-A ( 7 )   781 - 791   2003.7

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    Other Link: http://hdl.handle.net/10191/6552

  • A Multi-Scale Patching Method for Partial Fineness Control of VR Object Shape Reviewed

    WAKATSUKI Daisuke, ISHII Ikuo, TAKAHASHI Akira, IMAI Hiroei, MAKINO Hideo

    The Transactions of the Institute of Electronics,Information and Communication Engineers.   J86-D-II ( 5 )   697 - 705   2003.5

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    Other Link: http://hdl.handle.net/10191/25835

  • Approximation of Probability Distribution Functions by Coxian Distribution to Evaluate Multimedia Systems Reviewed

    SASAKI Yukie, IMAI Hiroei, TSUNOYAMA Masahiro, ISHII Ikuo

    The Transactions of the Institute of Electronics,Information and Communication Engineers.   J85-D-I ( 9 )   887 - 895   2002.9

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    Other Link: http://hdl.handle.net/10623/28442

  • A Multi-Scale Surface Patching Method for the Fineness Control of Octree Shape Model

    WAKATSUKI Daisuke, ISHII Ikuo, IMAI Hiroei, TAKAHASHI Akira, MAKINO Hideo

    ITE Technical Report   26 ( 35 )   31 - 36   2002.6

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    Language:Japanese   Publisher:The Institute of Image Information and Television Engineers  

    The rendering cost of the VR space can be reduced efficiently by selecting appropriate fineness of the shape for the observing distance without loss of drawing quality. We proposed a multi-scale modeling method that controls the fineness of the shape locally by dividing space to octree model. Though Marching-Cubes method is known as the way of forming patches in octant, there is a problem that a crack is created between the adjoining patches when the class level of them are different. In this paper, we describe an efficient and inconsistent surface patching method without any additional procedure like the crack-stitching method.

    DOI: 10.11485/itetr.26.35.0_31

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  • A synchronization mechanism in networked virtual environment Reviewed

    L Wang, H Ishii, H Imai, M Tsunoyama, Ishii, I

    IEEE WORKSHOP ON KNOWLEDGE MEDIA NETWORKING, PROCEEDINGS   23 - 27   2002

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

    This paper describes a design of group synchronization mechanism for local area network virtual environment and introduces a step synchronization mechanism. We use a football game for evaluate this mechanism. In this football game, users can share a virtual space in where they can move around, dribble and shot. To achieve synchronization among users, a client of the game exchanges data through a server within a certain period time. A problem of such a system is that all users should share the space in the same time for justice competition. But because of the different of capacity of computers and time cost by the communication between clients, it is difficult for all clients to update the virtual space simultaneity. In our systems, we introduce a waiting time synchronization mechanism. To evaluate our proposed architecture and mechanisms, we make a series of experiments in our local area network and then build and analyses the model of our system.

    DOI: 10.1109/KMN.2002.1115158

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  • A Multi-scale Modeling Method for High Reality Rendering Relative to the Viewing Distance

    Wakatsuki Daisuke, Ishii Ikuo, Imai Hiroei, Takahashi Akira, Makino Hideo

    Transactions of the Virtual Reality Society of Japan   6 ( 4 )   281 - 290   2001.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:THE VIRTUAL REALITY SOCIETY OF JAPAN  

    This paper describes a multi-scale modeling method that can display the wide VR space with enhancing the reality. We divide the object existing space into cubes hierarchically, and control the fineness of object shape by the parameter that indicates the complexity value of object shape. Utilizing this parameter, the object shape is simplified smoothly relative to the viewing distance. Moreover, the high-quality and high-reality VR space can be presented because the expression of the detailed shape of corresponding with the viewing distance can be realized. We showed the validity of the multi-scale modeling method in the high-reality wide VR space that has huge quantities of data.

    DOI: 10.18974/tvrsj.6.4_281

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    Other Link: http://hdl.handle.net/10191/25842

  • A method for analyzing a queuing network by the tagged-task model Reviewed

    Hiroei Imai, Masahiro Tsunoyama, Ikuo Ishii, Hideo Makino

    Systems and Computers in Japan   32 ( 13 )   52 - 60   2001.11

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    This paper considers faults in distributed real-time systems modeled by queuing networks
    in particular, a fast method of analysis of transient variation of system performance is proposed. This method involves analyzing queuing networks by means of the tagged-task model. Such an analysis requires repetitive determination of the limit-state probability at varied initial values
    however, the computation time can be reduced by using the absorption probability (the probability of arriving at the absorption state). In addition, a fast algorithm is proposed to calculate absorption probability, in which the state set is split into cosets according to arrivability, and the cosets are replaced by representatives as soon as the state probability becomes low. Finally, the effectiveness and accuracy of the proposed method are verified by actual examples. © 2001 Scripta Technica, Syst Comp Jpn.

    DOI: 10.1002/scj.1085

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  • A Multi-scale Modeling Method for High Reality Rendering Relative to the Viewing Distance Reviewed

    Wakatsuki Daisuke, Ishii Ikuo, Imai Hiroei, Takahashi Akira, Makino Hideo

    Transactions of the Virtual Reality Society of Japan   6 ( 4 )   281 - 290   2001.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:THE VIRTUAL REALITY SOCIETY OF JAPAN  

    This paper describes a multi-scale modeling method that can display the wide VR space with enhancing the reality. We divide the object existing space into cubes hierarchically, and control the fineness of object shape by the parameter that indicates the complexity value of object shape. Utilizing this parameter, the object shape is simplified smoothly relative to the viewing distance. Moreover, the high-quality and high-reality VR space can be presented because the expression of the detailed shape of corresponding with the viewing distance can be realized. We showed the validity of the multi-scale modeling method in the high-reality wide VR space that has huge quantities of data.

    DOI: 10.18974/tvrsj.6.4_281

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    Other Link: http://hdl.handle.net/10191/25842

  • Modeling Multimedia Servers Using Tagged Class Model and GSPN Reviewed

    K. Kumagai, M. Tsunoyama, H. Imai, I. Ishii

    Proc. of the 20th IASTED International Conference Modeling Identification and Control   807 - 812   2001.2

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  • Approximation method for probability distribution functions using Cox distribution to evaluate multimedia systems Reviewed

    Y Sasaki, H Imai, M Tsunoyama, Ishii, I

    2001 PACIFIC RIM INTERNATIONAL SYMPOSIUM ON DEPENDABLE COMPUTING, PROCEEDINGS   333 - 340   2001

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

    Several probability distribution functions such as exponential distribution function have been used to represent the task arrival process and processing time of tasks for multimedia systems. These distribution functions are simple, memory less, and easy-to-use, however,they are difficult to represent the task arrival process of multimedia stream data or audio data having real-time properties.
    This paper proposes a method for obtaining approximate probability distribution functions for given task arrival process for multimedia systems by using the Cox distribution function. The Cox distribution function can represent arbitrary distribution functions but their parameters are difficult to be determined for representing the given function. In the method, first, an objective probability distribution function is approximated by a linear combination of exponential distribution functions and Erlan distribution functions, then the parameters of the Cox distribution function is determined from the linear combination of the functions obtained above. The examples of the approximations show that the method is effective for approximating given prpbability distribution functions.

    DOI: 10.1109/PRDC.2001.992717

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  • A Method for Analyzing Queuing Network by Tagged-Task-Model Reviewed

    IMAI Hiroei, TSUNOYAMA Masahiro, ISHII Ikuo, MAKINO Hideo

    The Transactions of the Institute of Electronics,Information and Communication Engineers.   J82 ( 6 )   751 - 759   1999.6

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    Other Link: http://hdl.handle.net/10623/28445

  • Modeling and Evaluating Computer Systems for Multimedia Data Processing Reviewed

    Hiroei IMAI, Masahiro TSUNOYAMA, Ikuo ISHII, Hideo MAKINO

    Proceeding of the Eighteenth IASTED International Conference Modeling, Identification and Control   355 - 358   1999.2

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  • An Analyzing Method for Tagged-Task-Models Reviewed

    Imai Hiroei, Tsunoyama Masahiro, Ishii Ikuo, Makino Hideo

    J80 ( 10 )   836 - 844   1997.10

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  • Analysis of Responsive Systems at Processor Faults Reviewed

    Imai Hiroei, Tsunoyama Masahiro, Ishii Ikuo, Makino Hideo, Naito Sachio

    J78 ( 8 )   716 - 723   1995.8

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  • Analysis of Responsive Systems at Processor Faults Reviewed

    Hiroei IMAI, Masahiro TSUNOYAMA, Ikuo ISHII, Hideo MAKINO

    Proceedings of the 1995 Pacific Rim International Symposium on Fault-Tolerant Systems   78 ( 8 )   716 - 723   1995.8

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MISC

  • A Study on Relay Node Positioning in Sensor Networks Using Street Space

    115 ( 162 )   21 - 26   2015.7

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  • B-18-14 Development of a Triage Information-Transmission Application for RFID-equipped Smartphones

    Komatsu Kohei, Abe Satoshi, Imai Hiroei, Takahashi Masashi, Kinoshita Hidenori, Nishimori Kentaro, Makino Hideo

    Proceedings of the IEICE General Conference   2014 ( 2 )   582 - 582   2014.3

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  • B-18-15 Clarification of Triage-Information via WebGIS

    Proceedings of the IEICE General Conference   2014 ( 2 )   583 - 583   2014.3

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  • A Study on Relay Node Positioning in Sensor Networks Using Street Space

    Itagaki Yuya, Imai Hiroei, Mase Kenichi, Nakano Keisuke, Okada Hiraku

    IEICE technical report. ASN, Ambient intelligence and sensor networks   113 ( 399 )   35 - 40   2014.1

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    Language:Japanese   Publisher:The Institute of Electronics, Information and Communication Engineers  

    Configuring wireless multi-hop sensor networks is considered using vehicles equipped with sensor and communication devices in wide-scale disaster area. To maintain connectivity and communication quality in sensor networks, vehicles equipped with relay nodes can be used. In this paper, we propose relay node positioning method that ensures link quality with consideration of digital map information with streets and buildings. The proposed method consists of two stages, The first stage selects candidate sites for relay node positions, The second stage determines the positions of relay nodes. It is show as the results of computer simulation that the proposed method can achieve high delivery rate.

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  • A Study on Semi Fixed Routing Method for Wireless Mesh Networks

    112 ( 30 )   7 - 11   2012.5

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  • A Study on Semi Fixed Routing Method for Wireless Mesh Networks

    2012 ( 2 )   1 - 5   2012.5

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  • B-19-3 Basic Research of A Bird Location Monitor using Smartphone

    Wakatsuki Yuta, Nishikata Hirokazu, Imai Hiroei, Makino Hideo

    Proceedings of the IEICE General Conference   2012 ( 2 )   626 - 626   2012.3

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  • B-19-18 Development of DMAT-Information Assist System : Triage Information-Transmission Method using RFID-equipped Smartphones

    Komatsu Kohei, Hatanaka Masaki, Kamei Shuichi, Ito Tatsuya, Imai Hiroei, Kobayashi Jiro, Takahashi Masashi, Kinoshita Hidenori, Nishimori Kentaro, Makino Hideo

    Proceedings of the IEICE General Conference   2012 ( 2 )   641 - 641   2012.3

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  • B-19-29 Development of DMAT-Information Assist System : Triage Data Browsing System for Smartphones

    Abe Satoshi, Ito Tatsuya, Imai Hiroei, Hatanaka Masaki, Kamei Shuichi, Takahashi Masashi, Kinoshita Hidenori, Nishimori Kentaro, Makino Hideo

    Proceedings of the IEICE General Conference   2012 ( 2 )   652 - 652   2012.3

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  • B-19-41 DMAT Information-Transmission Method using RFID-equipped Mobile and Smart Phones

    Ito Tatsuya, Hatanaka Masaki, Kamei Shuichi, Imai Hiroei, Kobayashi Jiro, Takahashi Masashi, Kinoshita Hidenori, Makino Hideo

    Proceedings of the Society Conference of IEICE   2011 ( 2 )   459 - 459   2011.8

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  • B-21-5 Performance Evaluation of OLSRv2 with Link Metric in a Large Scale Testbed

    IMAI Hiroei, MASE Ken'ichi

    Proceedings of the IEICE General Conference   2011 ( 2 )   661 - 661   2011.2

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  • Performance evaluation of OLSRv2 with link metric

    IEICE technical report   110 ( 253 )   91 - 96   2010.10

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  • Scalability evaluation of OLSRv2 in large scale testbed

    IEICE technical report   109 ( 247 )   13 - 18   2009.10

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  • B-21-5 An Implementation of OLSRv2 and its Scalability Evaluation in Testbed

    Matsuda Toru, Imai Hiroei, Mase Kenichi

    Proceedings of the Society Conference of IEICE   2009 ( 2 )   418 - 418   2009.9

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  • A geometric method for calibration of internal camera parameters of fish-eye lenses

    Hideki Komagata, Ikuo Ishii, Akira Takahashi, Daisuke Wakatsuki, Hiroei Imai

    Systems and Computers in Japan   38 ( 12 )   55 - 65   2007.11

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    Fish-eye cameras (cameras with a fish-eye lens) have a very wide view angle of about 180° and a great depth of field, Therefore, it is possible to take pictures of broad scenes with a fixed posture, and it is suitable for uses like 3D modeling and surveillance cameras for indoor and outdoor environments. Geometrical and optical calibration of the internal parameters are necessary for improvement of the measuring accuracy in the real world. In this paper, we address the geometrical calibration problem. Some geometrical methods for calibration of the internal camera parameters of fish-eye cameras force the eye camera into a perspective model that is not applicable in wide views of 180° or more. We propose a calibration method using spherical projection and projection models, which combine the projection function of the fish-eye lens and geometrical distortion models. Pur method can perform calibration quickly and with high accuracy by using patterns of horizontal and vertical parallel lines shown on a liquid crystal display (LCD), which can display such patterns with high accuracy. We show the effectiveness of our method by an experimental evaluation with a fish-eye camera of orthographic projection type, which obtains high resolution near the edges of the imaging area. © 2007 Wiley Periodicals, Inc.

    DOI: 10.1002/scj.20685

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  • B-21-61 An Implementation of Multi-hop Wireless LAN

    Murakami Yuichi, Owada Yasunori, Terui Hiroyasu, Imai Hiroei, Mase Kenichi

    Proceedings of the IEICE General Conference   2006 ( 2 )   621 - 621   2006.3

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  • A Shape Fineness Control Method Applying Shape Recognition Characteristics of Moving VR Objects

    WAKATSUKI Daisuke, ISHII Ikuo, TAKAHASHI Akira, IMAI Hiroei

    Proceedings of the Virtual Reality Society of Japan,annual conference   8   497 - 500   2003.9

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  • EFFICIENT TRANSMISSION METHOD OF VR OBJECTS USING OCTREE

    Sase Tomiyuki, Imai Hiroei, Tsunoyama Masahiro, Ishii Ikuo

    Proceedings of the Society Conference of IEICE   2003 ( 2 )   306 - 306   2003.9

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  • An Evaluation Method for Network Systems based on Delay-Jitter Analysis

    KUMAGAI Koutarou, TSUNOYAMA Masahiro, IMAI Hiroei, ISHII Ikuo

    IEICE technical report. Dependable computing   102 ( 658 )   43 - 48   2003.2

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    Language:Japanese   Publisher:The Institute of Electronics, Information and Communication Engineers  

    Network systems processing multimedia data having real-time properties should satisfy given limits for not only average delay time but the variance of it (jitter). This paper proposes a method for evaluating network systems based on delay-jitter analysis using Generalized Stochastic PetriNets (GSPN). Systems are modeled by GSPN, and average delay time and its variance are calculated by using equations derived from a Markov chain of the GSPN model. The paper also shows an example of analysis for a client-server system. The result shows that the average delay time and jitter can be obtained easily, and the method is effective for evaluating network systems.

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  • A High Reality Drawing Method for VR Objects with Details Structure in Consideration of Shape Recognition Characteristics of Observers

    Daisuke WAKATSUKI, Ikuo ISHII, Akira TAKAHASHI, Hiroei IMAI, Hideo MAKINO

    The Transactions of the Institute of Electronics, Information and Communication Engineers A   J86-A ( 7 )   781 - 791   2003

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  • A Multi-Scale Patching Method for Partial Fineness Control of VR Object Shape

    Daisuke WAKATSUKI, Ikuo ISHII, Akira TAKAHASHI, Hiroei IMAI, Hideo MAKINO

    The Transactions of the Institute of Electronics, Information and Communication Engineers D-II   J86-D-II ( 5 )   697 - 705   2003

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  • A High Reality Modeling Method of VR Objects with Detailded Structure in Consideration of Shape Recognition Characteristics

    WAKATSUKI Daisuke, ISHII Ikuo, TAKAHASHI Akira, IMAI Hiroei

    Proceedings of the Virtual Reality Society of Japan,annual conference   7   371 - 374   2002.9

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  • A Multi-Scale Surface Patching Method for the Fineness Control of Octree Shape Model

    WAKATSUKI Daisuke, ISHII Ikuo, IMAI Hiroei, TAKAHASHI Akira, MAKINO Hideo

    Human Interface   4 ( 3 )   31 - 36   2002.6

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  • A Multi-Scale Surface Patching Method for the Fineness Control of Octree Shape Model

    WAKATSUKI Daisuke, ISHII Ikuo, IMAI Hiroei, TAKAHASHI Akira, MAKINO Hideo

    Technical report of IEICE. Multimedia and virtual environment   102 ( 109 )   31 - 36   2002.6

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    Language:Japanese   Publisher:The Institute of Electronics, Information and Communication Engineers  

    The rendering cost of the VR space can be reduced efficiently by selecting appropriate fineness of the shape for the observing distance without loss of drawing quality. We proposed a multi-scale modeling method that controls the fineness of the shape locally by dividing space to octree model. Though Marching-Cubes method is known as the way of forming patches in octant, there is a problem that a crack is created between the adjoining patches when the class level of them are different. In this paper, we describe an efficient and inconsistent surface patching method without any additional procedure like the crack-stitching method.

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  • A Multi-scale Modeling Method Considering the Characteristics of Form Recognition

    WAKATSUKI Daisuke, ISHII Ikuo, IMAI Hiroei, TAKAHASHI Akira

    Proceedings of the Virtual Reality Society of Japan,annual conference   6   295 - 298   2001.9

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  • A-16-7 An Acquiring and Modeling Method of 3-D Form of Trees for the Multi-scale Indication

    DONG JingTing, WAKATSUKI Daisuke, ISHII Ikuo, TAKAHASHI Akira, IMAI Hiroei

    Proceedings of the Society Conference of IEICE   2001   208 - 208   2001.8

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    Language:English   Publisher:The Institute of Electronics, Information and Communication Engineers  

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  • A Multi-Scale Modeling Method for High Reality Rendering Relative to the Viewing Distance

    Daisuke Wakatsuki, Ikuo Ishii, Hiroei IMAI, Akira Takahashi, Hideo MAKINO

    Transactions of the Virtual Reality Society of Japan   6 ( 4 )   281 - 290   2001

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  • リアルタイムシステム解析のためのコックス型分布の確率分布の近似方法について

    佐々木幸恵, 今井 博英, 角山 正博, 石井 郁夫

    日本信頼性学会第9回研究発表会, REAJ誌   23 ( 4 )   401 - 402   2001

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    Language:Japanese   Publisher:日本信頼性学会  

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  • A Multi-Scale Modeling Method Preserving the Object Features

    WAKATSUKI Daisuke, ISHII Ikuo, IMAI Hiroei, TAKAHASHI Akira

    Proceedings of the Virtual Reality Society of Japan,annual conference   5   177 - 180   2000.9

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  • An Implementation of a Multimedia System using Dynamic QoS Guarantee Scheme

    KOBAYASHI Akihiro, IMAI Hiroei, TSUNOYAMA Masahiro, ISHII Ikuo

    Technical report of IEICE. FTS   99 ( 344 )   7 - 12   1999.10

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  • 広域仮想空間提示の一方法と空間中のオブジェクトのモデリング法 (日本バーチャルリアリテイ学会第4回大会) -- (3-Dモデリング)

    若月 大輔, 石井 郁夫, 今井 博英

    日本バ-チャルリアリティ学会大会論文集   4   355 - 358   1999.9

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  • An Analysis Method of Queuing Network Represented by Tagged-Task-Model

    Imai Hiroei, Tsunoyama Masahiro, Ishii Ikuo, Makino Hideo

    Technical report of IEICE. FTS   FTS97 - 70   1997

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    Language:Japanese   Publisher:The Institute of Electronics, Information and Communication Engineers  

    This paper presents a method for analyzing the dynamic performance of distributed real-time systems. A tagged-task-model is used for analyzing the systems represented by queuing networks. And task loss ratio when a processor fault occurs is calculated using absorption probabilities of the model. In order to reduce the time required for calculating probabilities, the set of states of the model is partitioned into cosets based on the reachabilities between states, and the elements in the cosets are aggregated to one state when the sum of the state probabilities in a coset becomes less than the given threshold value. The proposed method is evaluated by the computational complexity for calculating the probabilities. This paper also shows an example of analysis, and errors in the analysis is compared with that when aggregations are not made.

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Research Projects

  • Interdisciplinary Case Studies of the Analysis, Conservation, and Utilization of Anime's Intermediate Materials

    Grant number:20H01218

    2020.4 - 2025.3

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Scientific Research (B)

    Awarding organization:Japan Society for the Promotion of Science

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    Grant amount:\17290000 ( Direct Cost: \13300000 、 Indirect Cost:\3990000 )

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  • Development of a general information system for dental and oral disease targeting electronic medical record.

    Grant number:14370663

    2002 - 2004

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Scientific Research (B)

    Awarding organization:Japan Society for the Promotion of Science

    SUZUKI Ichiro, KOHEI Akazawa, TAKAGI Ritsuo, SAKU Takashi, HAYASHI Takafumi, IMAI Hiroei

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    Grant amount:\13200000 ( Direct Cost: \13200000 )

    A major breakthrough in medical field has been progressed including information technology and standardization of medical term and data exchange protocol. However, its development has been more slowly in dental field than in common medical field. From such a background, we had been tried to examine the method of digitization and standardization of dental region, and to construct total information system trying for electric health record (EHR) of dental hospital and/or clinic for the purpose of providing advanced and efficient dental health care services.
    Summary of the research and the results were as follows.
    1) For the EHR platform named "DEXR", ready-made dental insurance claim system for personal clinic had been introduced in our hospital for the purpose of training for accurate and efficient description of clinical record.
    2) The DEXP was improved by adding rich-text editor for SOAP description and image filing viewer. The improved DEXP has satisfied for general dental clinic use as EHR.
    3) The improved DEXP was connected to hospital information system, imported patient's data from ordering database and exported disease and treatment data to hospital claim system.
    4) Among three requirements for EHR in Japan (authenticity, readability and availability), authenticity was achieved to encoding daily backup data by electric signature.
    5) EHR based on dental insurance claim system may be reasonable and agreeable method for developing dental EHR system.
    6) Standard dental disease master corresponding to the ICD-DA and standard dental treatment master have been worked out at MEDIS-DC. Unfortunately, formal version was not released in the research period, so that we could not adopt the standard master to our EHR system.
    7) As to data exchange between different dental EHR or hospital information system, we have tried to use XML schema as lower class of data exchange format. It must be standardized medical term and upper class of data exchange format (e.g. HL7, DICOM or MERIT-9).

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Teaching Experience (researchmap)

Teaching Experience

  • 知能情報システム実験IV

    2020
    Institution name:新潟大学

  • 知能情報システム実験III

    2020
    Institution name:新潟大学

  • 知能情報システム実験I

    2019
    Institution name:新潟大学

  • 知能情報システム実験II

    2019
    Institution name:新潟大学

  • 情報工学実験I

    2019
    -
    2021
    Institution name:新潟大学

  • 情報工学演習

    2009
    Institution name:新潟大学

  • 情報工学基礎実習I

    2008
    Institution name:新潟大学

  • コンピュータアーキテクチャ

    2007
    Institution name:新潟大学

  • 情報工学実験II

    2007
    -
    2021
    Institution name:新潟大学

  • 計算機構成論

    2007
    -
    2010
    Institution name:新潟大学

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