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( Daisuke Yamada ),( Tomoaki Nishikawa ),( Takuro Yoshikawa ),( Takayuki Kawai ),( Norihiro Kori ),( Mina Kobayashi ),( Masashi Kodan ),( Kohei Seto ),( Kumiko Yamashita ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
A heavy rainfall in July 2018 caused sediment disasters in West Japan. In this disaster, some debris flow were occured on slopes that were not recognized the potential of the occurence of sediment disasters. In this report, based on the results of the sediment disaster emergency survey conducted in several cities in West Japan, we will report the distribution and examples of slopes where these disasters occurred. In addition, regarding the occurrence of debris flow, the features related to topography and weather were examined. In Japan, the hazards of sediment disasters are recognized based on whether the topography of the slope has the same conditions as the topography of sediment disasters that occurred in the past. In this report, we focused on the debris flow occured on the slope that was not recognized as a valley where the debris flow occurs(the valley depth is wider than the valley width). As a result of this survey, we were able to understand the characteristics of the debris flow that occurred at a slope that was not recognized dangerous of sediment disaster. We believe that this report will help improve the warning and evacuation system for future sediment disasters in Japan.
An LQ Approach to Constrained Nonlinear Optimal Control Problems via Riccati Transformation
Joe Imae,Tomonari Ando,Tomoaki Kobayashi,Guisheng Zhai 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
A new algorithm for numerical solutions of constrained nonlinear optimal control problems has been proposed based on Riccati transformation. First, we approximate the constrained nonlinear optimal control problems by the Taylor expansion technique. Then, constructing the constrained LQ problems as the accessory problems, we analytically solve them via Riccati transformation. Finally, repeating the above procedure, we eventually obtain the optimal solutions for constrained nonlinear optimal control problems. The effectiveness of the proposed algorithm has been demonstrated through simulation.
Stability Analysis and Design for Switched Descriptor Systems
Guisheng Zhai,Ryuuen Kou,Joe Imae,Tomoaki Kobayashi 제어·로봇·시스템학회 2009 International Journal of Control, Automation, and Vol.7 No.3
In this paper, we consider stability analysis and design for switched systems consisting of linear descriptor systems that have the same descriptor matrix. When all descriptor systems are stable, we show that if the descriptor matrix and all the system matrices are commutative pairwise, then the switched system is stable under arbitrary switching. This is an extension of the existing well known re-sult in [1] for switched linear systems with state space models to switched descriptor systems. Under the same commutation condition, we also show that in the case where all descriptor systems are not stable, if there is a stable convex combination of the unstable descriptor systems, then we can establish a class of switching laws which stabilize the switched system. We finally make some discussion about obtaining the stable convex combination by solving a matrix inequality efficiently, and about relaxing the commutation condition for stabilizability of the switched system.
Azusa Sasaki,Yasushi Nakamura,Yukiko Kobayashi,Wataru Aoi,Takako Nakamura,Koji Shirota,Noboru Suetome,Michiaki Fukui,Tomoaki Matsuo,Shigehisa Okamoto,Yuri Tashiro,Eun Y. Park,Kenji Sato 한국식품연구원 2018 Journal of Ethnic Foods Vol.5 No.1
Background The fruit of Katsura-uri, traditionally used in the preparation of pickles in Japan, is facing an extinction crisis. In addition to the traditional dishes prepared from Katsura-uri, alternative dishes using the fruit should be devised to increase consumer demands for the protection of the heirloom vegetable. We attempted designing new Katsura-uri contemporary dishes and assessed the application of Katsura-uri juice as a functional drink without raising blood glucose levels. Methods Cooking experiments were conducted with Katsura-uri in its ripening stages, based on the advice from a licensed chef and a registered dietitian in Japan. In the questionnaire-based sensory evaluation, consumer acceptability of Katsura-uri juice was assessed. The blood glucose levels were measured after healthy volunteers consumed the juice. Results We demonstrated six new Katsura-uri dishes. In the questionnaire-based sensory evaluation of Katsura-uri juice, the assessment values for taste and fragrance were high. In human trials, the levels of incremental area under the curve and glucose spike were significantly lower after consumption of Katsura-uri juice, as compared to those after consumption of muskmelon juice. Conclusion Katsura-uri-containing contemporary dishes and juice would help continue the consumption of the vegetable. Based on the results of the questionnaire, we also concluded that the use of Katsura-uri as a functional drink without raising blood glucose levels is superior to its use as contemporary dishes. These findings provide useful strategies to protect Katsura-uri from extinction.
오세진,염재환,노덕규,오충식,정진승,정동규,Tomoaki Oyama,Noriyuki Kawaguchi,Hideyuki Kobayashi,Kazuyuki Kawakami,Kensuke Ozeki,Hirohumi Onuki 한국융합신호처리학회 2013 융합신호처리학회 논문지 (JISPS) Vol.14 No.2
n this paper, the residual delay compensation algorithm is proposed for FX-type KJJVC. In case of initial version as that design algorithm of KJJVC, the integer calculation and the cos/sin table for the phase compensation coefficient were introduced in order to speed up of calculation. The mismatch between data timing and residual delay phase and also between bit-jump and residual delay phase were found and fixed. In final design of KJJVC residual delay compensation algorithm, the initialization problem on the rotation memory of residual delay compensation was found when the residual delay compensated value was applied to FFT-segment, and this problem is also fixed by modifying the FPGA code. Using the proposed residual delay compensation algorithm, the band shape of cross power spectrum becomes flat, which means there is no significant loss over the whole bandwidth. To verify the effectiveness of proposed residual delay compensation algorithm, we conducted the correlation experiments for real observation data using the simulator and KJJVC. We confirmed that the designed residual delay compensation algorithm is well applied in KJJVC, and the signal to noise ratio increases by about 8%. 본 논문에서는 FX 형식의 한일상관기(Korea-Japan Joint VLBI Correlator, KJJVC)의 잔차 지연 보정 알고리즘을 제안하였다. KJJVC의 초기 잔차 지연보정 알고리즘에는 연산의 고속화를 위해 정수 연산과 위상보정 계수를 위한 cos/sin table을 도입하였다. 그리고 잔차 지연 알고리즘의 초기설계에서 데이터의 타이밍과 잔차 지연 위상의 불일치와 비트쉬프트와 잔차 지연 위상의 불일치 문제를 해결하였다. VCS의 잔차 지연 알고리즘의 최종 설계에서는 잔차 지연보정된 값을 FFT segment에 적용할 때 잔차 지연 보정 회전 메모리가 초기화 되지 않는 것을 수정하였다. 제안한 잔치 지연 보정 알고리즘을 이용하여, 교차 전력 스펙트럼의 대역폭 모양이 모든 대역폭에 대해서 손실이 없이 평탄한 것을 확인하였다. 제안한 잔차 지연보정 알고리즘의 유효성을 확인하기 위해 시뮬레이터와 KJJVC를 이용하여 실제 관측데이터를 대상으로 상관처리 시험을 수행하였다. 실험결과를 통하여 제안한 잔차 지연 보정 알고리즘이 KJJVC에 잘 적용되고 있으며, 신호대 잡음비가 약 8% 향상되는 것을 확인하였다.
Qualitative Analysis of Switched Discrete-Time Descriptor Systems
Guisheng Zhai,Joe Imae,Xuping Xu,Tomoaki Kobayashi 제어·로봇·시스템학회 2009 International Journal of Control, Automation, and Vol.7 No.4
In this paper, we consider stability analysis and design for switched systems consisting of linear discrete-time descriptor subsystems. When all descriptor subsystems are stable, we show that if the descriptor matrix and all the subsystem matrices are commutative pairwise, then the switched system is stable under arbitrary switching. We also extend the result to the case where all subsystems have different descriptor matrices. Under the same commutation condition, we show that in the case where none of the descriptor subsystems is stable, if there is a stable combination of the unstable descriptor subsystems, then we establish a class of switching laws which stabilize the switched descriptor system. All the results are natural but important extensions to the existing results for switched systems composed of state space subsystems.