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Effects of shaft angle on cutting tool parameters in internal gear skiving
Koichiro Uriu,Tsukasa Osafune,Takanori Murakami,Morimasa Nakamura,Daisuke Iba,Masami Funamoto,Ichiro Moriwaki 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.12
Gear skiving has received considerable attention because of its high productivity, particularly in internal gear cutting, and skiving cutter design methods have been widely investigated. At the beginning of a cutter design process, a shaft angle, a center distance, and the number of teeth are examined as basic parameters for cutting gears. In current gear skiving, a shaft angle is generally set to be approximately 20°; however, the reason for selecting this value has not been clarified. In the present study, the validity of the value of shaft angle is discussed by calculating the cutting tool parameters, such as instantaneous rake angles, clearance angles, cut depths, and cutting speeds at continuously moving cutting points against various shaft angles. Therefore, the widely used value of shaft angle would result in moderate cutting tool parameters. In addition, the cutting force and cutter wear would be low when a cutter axis inclines opposite to the gear helix to be cut.
SYSTEMATIC RISK AND COMPETITIVE ENVIRONMENT IN THE JAPANESE SHIPPING INDUSTRY
Koichiro TEZUKA 인하대학교 정석물류통상연구원 2008 인하대학교 정석물류통상연구원 학술대회 Vol.2008 No.3
This study addresses the issue of how the competitive environment, particularly the introduction of competitive policies such as the Shipping Act of 1984 and the Ocean Shipping Reform Act of 1998 in the US, affects the Japanese liner shipping industry. In order to evaluate the competitive environment and the market performance after the introduction of such competitive policies, we examine the risk structure of the Japanese shipping industry using stock price data. To analyze the risk structure, we estimate the time varying systematic risk beta of each Japanese liner shipping company and show the possibility that the introduction of competitive policies would increase beta, whereas inter-firm cooperation such as alliance would decrease it.
Koichiro Shiraishi,Hajime Kimua 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper deals with motion planning for a multifunctional under water robot that can perform various tasks such as swimming, walking and grasping objects. The author shaved eveloped a unified motion planning method that can generate motion planning for avariety of movement using a single algorithm. Under this method, motion planning problems are modeled as finite-horizon Markov decision processes, and optimum motion planning is achieved by dy-namic programming. However conventional dynamic programming is sometimes considered to have limited applicability because of ”thecurse of dimensionality.” To avoid this issue, we propose two efficient approaches. One is an application a random network as a state transition network to suppress the explosion in the number of states. The other is a modification using agradient method to improve the found motionin the random network. The effectiveness of the proposed method is demonstrated through numerical simulations involving two types of tasks formulti functional robots. One is a reaching task, and the other is a thrust force generation task.
Strategy and Methodology of Science Integration in Transdisciplinarity
Koichiro Deguchi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In this presentation, we discuss the strategy and methodology to let the fields of science and technologies get together and join to birth an integrated discipline. It is widely accepted that recent social problems which concern onsuch as environment, economy, safety and human health problems need integral work of several fields of sciences and technologies. It is important to maintain the cooperation after the solution and push it up to one step higher stage, that is,to birth a new comprehensive science and technology.
DC Langmuir Probe for Measurement of Space Plasma: A Brief Review
Koichiro Oyama 한국우주과학회 2015 Journal of Astronomy and Space Sciences Vol.32 No.3
Herein, we discuss the in situ measurement of the electron temperature in the ionosphere/plasmasphere by means of DC Langmuir probes. Major instruments which have been reported are a conventional DC Langmuir probe, whose probe voltage is swept; a pulsed probe, which uses pulsed bias voltage; a rectification probe, which uses sinusoidal signal; and a resonance cone probe, which uses radio wave propagation. The content reviews past observations made with the instruments above. We also discuss technical factors that should be taken into account for reliable measurement, such as problems related to the contamination of electrodes and the satellite surface. Finally, we discuss research topics to be studied in the near future.