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Ozaki Yukiko,Alessandri Elena,Uenosono Satoshi,Takamiya Tsuguyuki,Shigeru Takano 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
We investigated the mechanism how the high green density can be provided during die lubricated warm compaction (WD). We observed and analyzed the densification processes of iron powders including different contents of an inner lubricant, and measured the lateral pressure at the die wall during WD in comparison with conventional compaction and warm compaction. As a result, the high density in WD was due to not only the particles-deformation enhanced by warming powders but also the particles-rearrangement promoted by reducing an amount of the inner lubricant rather than the die lubrication.
Nonlinear Receding Horizon Control of a Tandem Cold Millin Acceleration and Deceleration Conditions
Kohei Ozaki,Toshiyuki Ohtsuka,Kenji Fujimoto,Akira Kitamura,Makishi Nakayama 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
For precise control of tension and thickness in a tandem cold millinac celeration and deceleration conditions, we employ an onlin ear model in cluding the rolling speed as a time-varying parameter. It is demon strated in simulation results that nonlinear receding horizon control by realtime optimization achieves satisfactory performance for the nonlinear model.
Yasushi Ozaki,Atsushi Sawatari 한국펄프·종이공학회 1999 한국펄프종이학회 기타 간행물 Vol.- No.-
It has been proven in previous work that rosin sizing agents are distributed relatively homogeneously on the outer surface of paper. Therefore, rosin sizing agents on paper surfaces can be characterized by macro domain measurement techniques with very thin layer from the surface. In this work, the role of rosin sizing agents on paper surface was investigated by comparing wettability from contact angle measurment with the chemical state of the outermost surface hy the ESCA. Furthermore, the role of rosin on the surface of paper was discussed by the quantity of hydroxyl groups obtained from chemical modification with the TFAA-ESCA technique. It was found from the ESCA data that the fixing mechanism with soap-type rosin sizing is different from that with emulsion-type rosin sizing.
韓国の大学の日本語クラスにおける合意形成を目指した話し合い活動の試み
尾崎ちえり(Ozaki, Chieri) 대한일어일문학회 2017 일어일문학 Vol.74 No.-
Students are likely to encounter situations in real life where they have to form agreements with others, and it is oftentimes not easy. Therefore, students need practice to develop their consensus-building ability. This paper introduces discussion activities aimed at consensus-building through project work in a Japanese class of a Korean university and reports the advantages and disadvantages of them. In the class, reflection and visualization are emphasized to increase consensus-building ability. Then, after sharing rules for discussion and focusing on discussion methods and process, a method was introduced to organize, integrate, and combine opinions required to draw a conclusion. As a result of the practice, learners were able to express their own evidence-based opinion and to reach a convincing conclusion that everyone can agree on. To investigate learners" awareness for the discussion activity, an end-of-semester questionnaire and interview data were conducted for analysis. The results revealed that the participants reacted positively for the discussion activities. The advantages of the discussion activities were that 1) the participants were provided with an opportunity to say their own opinions freely in Japanese, 2) learners realized improvements in Japanese speech skills and communication skills, 3) learners widened their perspectives through being exposed to others" opinions. On the other hand, disadvantages were due to level differences in Japanese skills between learners and difficulty in consensus-building.