The 7th COE Postdoctoral and Doctoral Researchers
Technical Presentation

Date: Thursday, Oct 28, 2004
Time: 13:30 - 15:50
Place: L1 Lecture room
Language: English (oral presentation), English/Japanese (question)
Chairperson: Yuichi Kurita (Robotics Lab.: D3),
Kentaro Takemura (Robotics Lab.: D2)

Program (20 mins each: 15 mins presentation and 5 mins discussion)

  1. "3D Modeling of Outdoor Scenes from Omnidirectional Range and Color Images"
    浅井 俊弘 (視覚情報メディア講座: D1)
    Toshihiro Asai (Vision and Media Computing Lab.: D1)

    [Abstract]
    3D models of outdoor environments can be used in a number of fields such as site simulation and virtual walk-through. However, such 3D models are often made manually with high costs, so recently automatic 3D modeling has been widely investigated. We propose the 3D modeling method of wide area outdoor environments by using an omnidirectional laser rangefinder and an omnidirectional multi-camera system (OMS) which can capture a wide-angle high-resolution image, the range and color data of outdoor environments are efficiently acquired. Moreover, by using RTK-GPS and gyro sensor to measure the position and orientation of the sensor system, the 3D model of wide area outdoor senes is efficiently generated.
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  2. "Tele-Echography System in Ubiquitous Networking Media Environment"
    増田 泰 (像情報処理学講座: PD)
    Yasushi Masuda (Image Processing Lab.: PD)

    [Abstract]
    In this presentation, a tele-echography framework that provides ultrasound image diagnosis in the ubiquitous multimedia computing network, is described. The system consists of a wearable computer, a hand-held size ultrasound imaging device and wireless networking. To adapt various imaging media in the ubiquitous computing environment, raw echo data are transmitted instead of pre-rendered image.
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  3. "Teleradiology for remote quantitative analysis of PET images"
    長縄 美香 (像情報処理学講座: PD)
    Mika Naganawa (Image Processing Lab.: PD)

    [Abstract]
    There are few radiologists, so nonradiologists perform the reading and the diagnosis on the scanned positron emission tomography (PET) images. Furthermore, there is less modelers who analyze quantitatively dynamic PET images based on compartment model. Teleradiology has been developed mainly in order to cover the loss of radiologists. Teleradiology means that the scanned image is transmitted from the examination site to an expert site where radiologists will perform the reading. The reports are sent back to the examination site where physicians can prescribe for a patients. In this talk, I'll summarize the background about PET data analysis, and propose a teleradiology system for quantitative analysis.
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  4. "An Examination about Gateway Determination Method considering Route Stability on the Hybrid Ad-hoc Network"
    島田 秀樹 (情報科学センター: PD)
    Hideki Shimada (Information Technology Center: PD)

    [Abstract]
    Mobile Ad-hoc network (MANET), that is configured autonomously by wireless mobile terminals, have been a focus of attention in the ubiquitous network. MANET is used to complement or coexistence of the infrastructure, called hybrid ad-hoc network. In the hybrid ad-hoc network, there are gateways to connect up MANET to the Internet. In the case that hybrid ad-hoc network complements the infrastructure, mobile terminals should communicate to the gateway stably. In this research, I have been designing algorithm to detect the stability of the routes from mobile terminals to gateways. By using this algorithm, mobile terminals will keep connecting to the Internet for longer time. Now, I investigate terminals conditions that need to detect this stability. In this presentation, I report results given through the simulation.
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  5. "The effects of space insertion into Japanese texts"
    中村 美智子 (自然言語処理学講座: PD)
    Michiko Nakamura (Computational Linguistics Lab.: PD)

    [Abstract]
    In the English writing system, spaces mark word boudaries and provide readers with important cues in reading. For example, readers detect spaces in periphreal vision and decide where to move next in a text. Consequently, the removal of such cues from normal meaningful texts slows down reading and changes eye fixation patterns within the text. The present study explores the effect of insertion of spaces on reading Japanese texts, in which word boundaries are not generally marked by spaces. Native speakers of Japanese read both spaced and unspaced texts, and their eye movement patterns during reading were recorded. The results showed that the insertion of spaces into texts facilitates reading. Possible interpretations of the results and implications for internet application will be discussed.
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  6. "An Analysis of Discrete-time Systems with a Single Delay: Razumikhin Theorem Approach"
    小木曽 公尚 (システム制御・管理講座: PD)
    Kiminao Kogiso(Systems & Control Lab.: PD)

    [Abstract]
    We consider a discrete-time system with a delay, in which the future evolution of the state not only depends on their current, but also on their past. One example of such the time-delay system is the feedback control system that includes networks. Since the delay is always considered detrimental to stability, it is important to investigate the effect of the time-delay in order to safely and accurately control the system. Then, this presentation shows two types of stability criterion for a discrete-time system with a single delay: one is a delay-independent, and the other is a delay-dependent, which both are derived by a concept of Razumikhin Theorem. Such criterion are very useful when we want to obtain a quick assurance that the delayed term will not destabilize the whole system.
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NAIST Graduate School of Information Science 21st Century COE Program