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- 저자 : Kono Yusuke (검색결과 4 건)
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Deformation Behavior of Corrosion-Resistant Fe-Cr Alloy
Era, Hidenori,Kono, Yusuke,Sasabuchi, Ryota,Miyoshi, Noriko,Tokunaga, Tatsuya,Shinozaki, Nobuya,Lee, Je-Hyun,Shimozaki, Toshitada Korean Society of Microscopy 2016 Applied microscopy Vol.46 No.1
Iron containing a high amount of chromium is known to be inferior to ductility due to ${\sigma}$ phase formation so that it is generally difficult to apply the plastic deformation process although the alloy possesses a superior characteristics of an excellent corrosion resistance. In this study, Fe-50mass%Cr alloy was melted using high purity powder and the deformation behavior has been investigated by cold rolling and tensile test. The tensile test yielded that the alloy revealed a serration at an early stage of tensile deformation and then the serrated flow vanished to change to a normal work hardening flow at the later stage. The former was governed by twin formation process, the latter by dislocation multiplication one, bringing about a high ductility of 20% or over. The reduction ratio in cold rolling was attained as high as 90%, thus the high corrosion-resistant alloy is able to possess a high ductility.
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( Takashi Hoshino ),( Toshifumi Watanabe ),( Yusuke Nakagawa ),( Hiroki Katagiri ),( Nobutake Ozeki ),( Toshiyuki Ohara ),( Mikio Shioda ),( Yuji Kono ),( Ichiro Sekiya ),( Hideyuki Koga ) 대한슬관절학회 2021 대한슬관절학회지 Vol.33 No.-
Purpose: This study assessed the clinical outcomes of periprosthetic joint infection patients who underwent twostage revision total knee arthroplasty with antibiotic-loaded cement spacers fabricated using a handmade silicone mold. Materials and methods: This study included seven patients (average age 77 years, average follow-up time 54 months) who underwent surgery at our hospital between 2009 and 2013. Clinical outcomes including knee scores, function scores, knee range of motion, and walking ability at the final observation, period from the primary total knee arthroplasty to implant removal, period from implant removal to revision total knee arthroplasty, and followup period after revision total knee arthroplasty were investigated. Results: At the final follow-up, the average knee range of motion was 99°, with no significant differences at each stage; average knee and function scores were 84 and 77, respectively. With cement spacers, five patients were able to walk with a t-cane. No recurrence of infection was observed. Conclusions: The clinical outcomes of the current case series demonstrated good knee function with preserved walking ability, without any recurrence of periprosthetic joint infection. This study suggests that using a handmade silicone mold could be an effective option for periprosthetic joint infection after a total knee arthroplasty.
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Lane-Changing Feature Extraction Using Multisensor Integration
Hanwool Woo,Yonghoon Ji,Hitoshi Kono,Yusuke Tamura,Yasuhide Kuroda,Takashi Sugano,Yasunori Yamamoto,Atsushi Yamashita,Hajime Asama 제어로봇시스템학회 2016 제어로봇시스템학회 국제학술대회 논문집 Vol.2016 No.10
We propose a feature extraction method for lane changes of other traffic participants. According to previous research, over 90 % of car crashes are caused by human mistakes, and lane changes are the main factor. Therefore, if an intelligent system can predict a lane change and alarm a driver before another vehicle crosses the center line, this can using the multisensor system which consists of a position sensor and a laser scanner with line markings information. For a lane change prediction of other traffic participants, the most effective features are a lateral position and velocity with respect to a center line. We installed the sensor system to the primary vehicle and measured positions of other traffic participants while the primary vehicle drives on a highway. We extracted the features as the distance with respect to the center line and the lateral velocity of other vehicles using the measurement data. We confirmed that our feature extraction method has an enough accuracy for the lane change prediction.
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Oh, Se-Jin,Yeom, Jae-Hwan,Roh, Duk-Gyoo,Oh, ChungSik,Jung, Jin-Seung,Chung, Dong-Kyu,Oyama, Tomoaki,Kawaguchi, Noriyuki,Kobayashi, Hideyuki,Kono, Yusuke,Ozeki, Kensuke,Onuki, Hirohumi 한국융합신호처리학회 2012 융합신호처리학회 논문지 (JISPS) Vol.13 No.4
본 논문에서는 VCS의 지연추적과 프린지 회전 모듈의 문제로 인한 상관결과에 대해 고찰한다. VCS는 FX 형식의 상관기로서 도플러 효과에 의한 전체로부터 도달하는 신호의 지연시간과 프린지 위상을 보정하기 위해 지연추적과 프린지 회전 모듈을 채용하고 있다. 관측데이터는 상관기에서 지연추적과 프린지 회전을 통하여 위상정보도 함께 보정되는데, AIPS에서 상관기보다 장시간의 상관적분을 수행함에 따라 위상이 안정되지 않은 것을 확인하였다. 그리고 상관결과의 해석에서 Delay 값이 정상보다 수십 nsec 정도 오차가 발생하였다. 또한 프린지 회전모듈에서 프린지 초기위상을 결정하지 않아서 상관결과의 위상이 FFT segment 단위로 연결되지 않는 것도 확인하였다. 본 논문에서는 이러한 문제들을 해결하기 위해 지연추적 모듈과 프린지 회전 모듈의 경우 위상보정을 담당하는 모듈의 부호가 반대로 동작하는 것과 관측데이터의 초기위상을 사용하도록 수정하였다. 그리고 프린지 회전 파라미터 계산모듈에 오류가 있는 것을 발견하여 VCS의 로직을 담당하는 프로그램을 개선하였다. 이상의 문제점들에 대해서 상관처리 실험을 통하여 본 논문에서 수정 제안한 알고리즘들이 데이터 해석결과에서 정확함을 확인하여, 개발한 VCS 하드웨어 상관기가 정상적으로 동작하는 것을 확인하였다. In this paper, we investigate the correlation result due to the problems of delay tracking and fringe rotation module in the VCS(VLBI Correlation Subsystem). The VCS, FX-type correlator, adopts the delay tracking and fringe rotation module in order to compensate the delay change and fringe phase of wave signal from the radio source by Doppler's effect. The phase of observed data is also compensated by means of delay tracking and fringe rotation in the correlator, but we confirmed that the phase is unstable by applying long integration period of AIPS(Astronomical Image Processing System) rather than correlator. And the delay value of observed data has the errors of several tens nanoseconds than normal case at the analysis of correlation result. In addition, we found that the phase of correlation results is not connected as the unit of FFT-segment because the initial fringe phase at the fringe rotation module is not correctly determined. In this paper, in order to solve these problems, the original direction of 90 degree phase jump is reversely modified when the bit-shift occurred at the delay tracking. And the initial fringe phase at the fringe rotation module is correctly modified by using the initial phase of observed data. In addition, the parameter calculation module was abnormally operated as designed in the fringe rotation. So, the logical program by the VCS is modified so as to calculate the parameters correctly. Through the experiments of correlation processing over the above problems, the modified proposal algorithm is adequately corrected to the data analysis results, so that the experimental results make it clear for us to operate the developed VCS hardware correlator normally.
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