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Recognition of Moving Objects by Image Processing and its Applications
Katsumi Moriwaki,Yuki Katayama,Katsuyuki Tanaka,Ruzo Hikami 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
We are developing a guide robot and an autonomous small vehicle to assist the visually impaired person and the aged. Various functions for support are installed in the guide robot, especially, obstacle avoidance functions necessary to ensure the safty of the user. When the guide robot is moving, the avoidance of not only the static objects but also moving objects is necessary. As the guide robot estimates the direction of the movement of approaching objects and emits a warning about its own movement, the user and the guide robot can safely pass by moving objects such as pedestrians and bicycles. In this research, we aim at the improvement of the safety of the guide robot and it proposes a method of recognizing moving objects by image processing.
Evaluation of Flight Size Auto Tuning On 3.5G Commercial Wireless Packet Access Network
Katsumi Sekiguchi,Satoru Imai,Yukie Yamamoto,Noriyoshi Meuchi,Osamu Takahashi 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
In this paper, we evaluate a performance of Flight Size Auto Tuning (FS-AT), a TCP congestion control method for high speed wireless access networks, on the commercial network of 3G and 3.5G mobile communication systems. HSDPA expands a bandwidth of IMT-2000 to maximum at 14Mbps. The expanded bandwidth increases bandwidth delay product (BDP) on an end-to-end channel. TCP is necessary to set congestion window (cwnd) larger than BDP to achieve maximum throughput of the channel capability. However, if cwnd becomes too large for BDP, TCP sender transmits packets excessively and packets are accumulated on a radio interwoking node. To solve this problem, FS-AT is proposed as a congestion control method for high speed wireless access networks. In this paper, we implementedFS-AT on Linux Server and evaluated its performance on the commercial packet access network of 3G and 3.5G mobile communication systems.
Component Commonality and Order Matching Rules in Make-to-Forecast Production
Katsumi Morikawa,Yusuke Deguchi,Katsuhiko Takahashi,Daisuke Hirotani 대한산업공학회 2010 Industrial Engineeering & Management Systems Vol.9 No.3
Make-to-forecast production is a way to realize high customization and fast responsiveness. This study firstly investigates the effect of introducing a common component in a make-to-forecast production environment. The common component can eliminate a modification step, which is a major cost component in make-to-forecast production. It is illustrated, however, that introducing a versatile component that merely covers several variants is unattractive, and thus adding values to the common component is inevitable in this environment. Secondly, an order-matching rule under the condition that two partially overlapped delivery lead time intervals exist is proposed. The rule considers the effect of matching orders to units that can cover both intervals. An alternative re-matching rule is also developed and examined. Numerical experiments clarify that the proposed rule generally realizes higher contribution ratio and lower percentages of orphans and rejected orders. The proposed re-matching rule increases the average contribution ratio at the expense of increased orphans and order rejections.