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Tatsuya Komuro,Ayano Shinozaki,Aramu Kim,Daisuke Doyo,Toshiyuki Matsumoto 대한산업공학회 2012 Industrial Engineeering & Management Systems Vol.11 No.1
Recently, global environmental problems have become serious due to human economic activities. Therefore, in order to build a sustainable society in which human economic activities coexist with nature, it is important to promote and enhance environmental education. As a preceding study, a board and computer game of "Ecopoly," which is the game for education on global environmental problems, were developed. This study further aims to develop algorithms which make decisions in Ecopoly, to automate decision-makings of opponents using the algorithms, and to develop the environmental educational game "Ecopoly V" which enables self-learning. In order to develop the algorithms, the board game of Ecopoly was played, and each player"s decision-makings at the all points at which players make a decision were observed and analyzed. From the analyses, it became clear that the decision-makings were distinguished by 3 characteristics; Ecology type, Economy type, and Balance type. Based on the characteristics, the factors and standard values of each decision-making were made clear. Algorithms were developed based on the factors and standard values. Ecopoly V was developed by incorporating the algorithms into the computer game of Ecopoly. Experimental testing of the game was conducted and the validity of the game was verified.
Komuro, Tatsuya,Shinozaki, Ayano,Kim, Aramu,Doyo, Daisuke,Matsumoto, Toshiyuki Korean Institute of Industrial Engineers 2012 Industrial Engineeering & Management Systems Vol.11 No.1
Recently, global environmental problems have become serious due to human economic activities. Therefore, in order to build a sustainable society in which human economic activities coexist with nature, it is important to promote and enhance environmental education. As a preceding study, a board and computer game of "Ecopoly," which is the game for education on global environmental problems, were developed. This study further aims to develop algorithms which make decisions in Ecopoly, to automate decision-makings of opponents using the algorithms, and to develop the environmental educational game "Ecopoly V" which enables self-learning. In order to develop the algorithms, the board game of Ecopoly was played, and each player's decision-makings at the all points at which players make a decision were observed and analyzed. From the analyses, it became clear that the decision-makings were distinguished by 3 characteristics; Ecology type, Economy type, and Balance type. Based on the characteristics, the factors and standard values of each decision-making were made clear. Algorithms were developed based on the factors and standard values. Ecopoly V was developed by incorporating the algorithms into the computer game of Ecopoly. Experimental testing of the game was conducted and the validity of the game was verified.
Influence of Ammonia Nitrogen on Anaerobic Acidogenesis of Night Soil
Eom,Tae-Kyu,Noike,Tatsuya,Matsumoto,Junichiro 慶星大學校 環境問題硏究所 1991 環境硏報 Vol.1 No.1
糞尿의 酸生成相에 있어서 回分 및 連續實驗을 통하여 암모니아성 窒素의 影響을 分析.檢討하였다. 그 결과 回分實驗에서 암모니아성 窒素가 增加함에 따라 揮發性脂昉酸의 生成速度는 比例的으로 減少하였으며, 암모니아성 窒素의 濃度가 1.000㎎/ℓ일 때 그 값은 0.38 ·COD/ℓ·day 암모니아성 窒素濃度가 6.000㎎/ℓ의 경우보다 約 1.7倍 더 큰 것으로 나타났다. 連續實驗에서, 糞尿의 암모니아성 窒素만을 約 50% 制御하여 運轉한 結果 炭水化物, 蛋白質 및 脂肪의 分解率은 制御하지 않은 反應槽의 그 分解率보다 훨씬 더 큰 값으로 나타남을 볼 때, 암모니아성 질소는 可能한 한 制御하여 運轉하는 것이 좋을 것으로 생각된다. 즉 메탄가스化를 촉진시키기 위해서는 그 前段階인 酸生成段階에서 부터 糞尿등의 암모니아성 窒素가 高濃度인 폐액(廢液)은 그 濃度를 낮게 制御하여 運轉하여야 할 것으로 思料된다. Influence ammonia nitrogen on anaerobic acidogenesis of night soil were investigated by batch and laboratory scale continuous experiments at 35℃. In the batch experiment, which were run in a vial to which 1.000㎎/ℓ ammonia nitrogen was added, the maximum volatile fatty acid (VFA) production rate was 0.38g ·COD/ℓ·day, decreasing gradually as the ammonia concentration in vial to which 6.000㎎/ℓ of ammonia nitrogen was added, the VFA production rate was 60% of that in thevial to which 1.000㎎/ℓof ammonia nitrogen was added. Inthe continuous experiments, the degradation rares of carbohydrate, protein and lipid inthe reactors to which low concentration ammonia nitrogen was added were less than that in the control. The degradation rates increased as the SRTs decreased. It is considered that hydrolytic bacteria work actively if the ammonia nitrogen of night soil is maintained at a low concentration. In may be possible that the acidogenesis of anaerobic digestion is upgraded by controlling the ammonia nitrogen concentration fo night soil added to the reactor.
Takashi Kawashimo,Daisuke Doyo,Tatsuya Yamaguchi,Ryosuke Nakajima,Toshiyuki Matsumoto 대한산업공학회 2015 Industrial Engineeering & Management Systems Vol.14 No.2
The recent manufacturing industry in Japan has found it difficult to transfer skills from trained workers to inexperienced workers because the former ages and then retires. This is a particular problem for lathe process, as this operation requires explicit and tacit knowledge, and defining the skills clearly in a manual is difficult. This study aims to develop a training system for lathe operation by using a simulator; this includes formulas that help define the relationship between the speed of tool feed and cutting sound/shape of chips which were proposed in the preceding study. The developed training system is verified the effectiveness.
Kawashimo, Takashi,Doyo, Daisuke,Yamaguchi, Tatsuya,Nakajima, Ryosuke,Matsumoto, Toshiyuki Korean Institute of Industrial Engineers 2015 Industrial Engineeering & Management Systems Vol.14 No.2
The recent manufacturing industry in Japan has found it difficult to transfer skills from trained workers to inexperienced workers because the former ages and then retires. This is a particular problem for lathe process, as this operation requires explicit and tacit knowledge, and defining the skills clearly in a manual is difficult. This study aims to develop a training system for lathe operation by using a simulator; this includes formulas that help define the relationship between the speed of tool feed and cutting sound/shape of chips which were proposed in the preceding study. The developed training system is verified the effectiveness.
Characteristics of Self-Leveling Behavior of Debris Beds in a Series of Experiments
Songbai Cheng,Hidemasa Yamano,Tohru Suzuki,Yoshiharu Tobita,Yuya Nakamura,Bin Zhang,Tatsuya Matsumoto,Koju Morita 한국원자력학회 2013 Nuclear Engineering and Technology Vol.45 No.3
During a hypothetical core-disruptive accident (CDA) in a sodium-cooled fast reactor (SFR), degraded core materials can form roughly conically-shaped debris beds over the core-support structure and/or in the lower inlet plenum of the reactor vessel from rapid quenching and fragmentation of the core material pool. However, coolant boiling may ultimately lead to leveling of the debris bed, which is crucial to the relocation of the molten core and heat-removal capability of the debris bed. To clarify the mechanisms underlying this self-leveling behavior, a large number of experiments were performed within a variety of conditions in recent years, under the constructive collaboration between the Japan Atomic Energy Agency (JAEA)and Kyushu University (Japan). The present contribution synthesizes and gives detailed comparative analyses of those experiments. Effects of various experimental parameters that may have potential influence on the leveling process, such as boiling mode, particle size, particle density, particle shape, bubbling rate, water depth and column geometry, were investigated, thus giving a large palette of favorable data for the better understanding of CDAs, and improved verifications of computer models developed in advanced fast reactor safety analysis codes.
CHARACTERISTICS OF SELF-LEVELING BEHAVIOR OF DEBRIS BEDS IN A SERIES OF EXPERIMENTS
Cheng, Songbai,Yamano, Hidemasa,Suzuki, TYohru,Tobita, Yoshiharu,Nakamura, Yuya,Zhang, Bin,Matsumoto, Tatsuya,Morita, Koji Korean Nuclear Society 2013 Nuclear Engineering and Technology Vol.45 No.3
During a hypothetical core-disruptive accident (CDA) in a sodium-cooled fast reactor (SFR), degraded core materials can form roughly conically-shaped debris beds over the core-support structure and/or in the lower inlet plenum of the reactor vessel from rapid quenching and fragmentation of the core material pool. However, coolant boiling may ultimately lead to leveling of the debris bed, which is crucial to the relocation of the molten core and heat-removal capability of the debris bed. To clarify the mechanisms underlying this self-leveling behavior, a large number of experiments were performed within a variety of conditions in recent years, under the constructive collaboration between the Japan Atomic Energy Agency (JAEA) and Kyushu University (Japan). The present contribution synthesizes and gives detailed comparative analyses of those experiments. Effects of various experimental parameters that may have potential influence on the leveling process, such as boiling mode, particle size, particle density, particle shape, bubbling rate, water depth and column geometry, were investigated, thus giving a large palette of favorable data for the better understanding of CDAs, and improved verifications of computer models developed in advanced fast reactor safety analysis codes.