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Surface Extraction from Multi-material CT Data
Fujimori, Tomoyuki,Suzuki, Hiromasa Society for Computational Design and Engineering 2006 International Journal of CAD/CAM Vol.6 No.1
This paper describes a method for extracting surfaces from multi-material CT (Computed Tomography) data. Most contouring methods such as Marching Cubes algorithm assume that CT data are composed of only two materials. Some extended methods such as [3, 6] can extract surfaces from the multi-material (non-manifold) implicit representation. However, these methods are not directly applicable to CT data that are composed of three or more materials. There are two major problems that arise from fundamentals of CT. The first problem is that we have to use n(n-1)/2 threshold values for CT data contains n materials and select appropriately one threshold value for each boundary area. The second is that we cannot reconstruct only from CT data in which area three or more materials are adjacent each other. In this paper, we propose a method to solve the problems by using image analysis and demonstrate the effectiveness of the method with application examples construct polygon models from CT data of machine parts.
${29}^Si$ MAS NMR Study on Quantitative Analysis of the Amorphous Phase in a $Si_3N_4$ Powder
Fujimori, Hirotaka,Kitahara, Hiromoto,Ioku, Koji,Goto, Seishi,Nakayasu, Tetsuo,Yamada, Tetsuo The Korean Ceramic Society 2000 The Korean journal of ceramics Vol.6 No.2
NMR study has been used for measuring precise quantity of the amorphous phase in the $Si_3N_4$powder. Care must be taken to allow the $^{29}$Si nuclear spin system to fully relax between pulses in order to make the signals proportional to the number of nuclei in each phase. $^{29}$Si MAS spectrum was decomposed into the three spectra of $\alpha$-, $\beta$-, and amorphous $Si_3N_4$assuming pseudo-Voigt function. Moreover, the Rietveld analysis of the powder X-ray diffraction data was performed to measure quantity of crystalline phases as $\alpha/\beta$ ratio.
Fujimori, Taro,Miyamoto, Yusuke,Hayashi, Yasuhiro The Korean Institute of Electrical Engineers 2012 The Journal of International Council on Electrical Vol.2 No.4
Photovoltaic (PV) systems have rapidly proliferated in Japan. One resulting problem is that PV output not consumed by residences is fed to distribution lines, significantly increasing voltage in the distribution system. Power conditioning systems must therefore suppress PV output to maintain appropriate voltage levels. This paper proposes a control method for diverting reverse power flow into storage batteries, avoiding the need for suppression. Another problem is that batteries are expensive, making it necessary to reduce total battery capacity. This paper therefore identifies residences where storage batteries should be introduced by calculating a suitability evaluation coefficient. This allows allocation of a priority sequence for introducing batteries into highly ranked residences. The authors furthermore begin investigation of battery control methods for effective suppression of battery output.
Parameter Identification of Continuous-Time Systems Using Iterative Learning Control
Atsushi Fujimori,Shinsuke Ohara 제어·로봇·시스템학회 2011 International Journal of Control, Automation, and Vol.9 No.2
This paper presents a system identification technique for continuous-time state-space system using the iterative learning control. The transfer function parameters are regarded as functions with respect to the state-space parameters which will be identified. The relationship between the state-space parameters and the response error is explicitly derived. An update law of the state-space parameters is proposed so as to improve the convergence speed. The effectiveness of the proposed identification technique is demonstrated by numerical examples.
Detonation of accumulated gases in BWR nuclear steam tube
Toshiro Fujimori 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.43
Accidental detonation waves in the pipeline systems of industrial plants, such as chemical and nuclear plant, are a threat of serious damages. In 2001, a steam pipeline was raptured due to detonation of radiolysis hydrogen and oxygen in Hamaoka No. 1 nuclear plant, and also a similar accident occurred overseas. After that, Japanese BWR owners, electric companies and plant engineering companies have investigated the whole processes form accumulation, combustion and destruction of pipe, and established a new guide line for designing the pipe system of the new plant and redesigning the existing plant[2]. This paper presents a part of the investigations of the detonation in the 90-degree bent pipes and its effect on the pipe structure.
Atsushi Fujimori,Shinsuke Ohara 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.3
This paper presents the order reduction for plant and controller models estimated by the joint input-outputapproach in the closed loop identification, named the controllability or observability intensity truncation (COIT)method in which the index for order reduction is the controllability intensity or the observability intensity. The useof these intensities depends on the estimated models obtained by the joint input-output approach. In the applicationof the closed loop identification with the balanced truncation (BT) and the COIT methods; a numerical exampleand an inverted pendulum experimental system, the COIT method appropriately reduces the order of the estimatedplant and controller models and is superior to the BT method.