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Globalization of Engineering Education in Asia
김윤해,T. Hanabusa,박세호 한국공학교육학회 2010 공학교육연구 Vol.13 No.2
The Asian Conference on Engineering Education has organized and is held in Busan. This paper tells the steps for theprocess of planning of this conference. Firstly, The Innovation Center for Engineering Education in Korea Maritime Universityand the Center for Innovation and Creativity Development in The University of Tokushima signed the mutualinterchange agreement on engineering education in 2005. The interrelation of both centers has made a continuous relationby mutual visiting of teachers and students. The first symposium on engineering education between the two universitieswas held in 2006. Three symposia were succeeded until now. By the way, the Japanese five-university coalition of engineering education was composed in 2004. This five-university coalition annually held the symposium on engineeringeducation. Two teachers and two students of each university participated in the symposium and introduced their activities.Annual symposium was held every year from 2004 to 2008. Based on these two kinds of symposium, we have plannedto enlarge the relationship by including partner universities in both countries. The capstone design coalition on engineering education between the Center for Innovation and Creativity Development in the University of Tokushima and the innovationcenter for engineering education in Korea Maritime Universityare introduced. The interrelation of both centers has held bymutual visiting of teachers and students during four years. The capstone design activities of Korea Maritime University andthe students' creative design projects of the University of Tokushima were introduced each other. This coalition is plannedthat it needs to be enlarged by including partner universities in both countries.
용사처리에 의한 자동차 브레이크용 마찰재료의 마찰성능개선에 관한 연구
김윤해,배창원,손태관 한국마린엔지니어링학회 1998 한국마린엔지니어링학회지 Vol.22 No.1
Friction materials for brake linings and clutches have severe performance requirements. The principal function of such frictional elements is to convert kinetic energy to heat, and then either to absorb or to dissipate heat. In order to achieve these objectives, the coefficient of friction must be as high as possible, independent of variations in operating conditions, and the necessary energy conversion must be accomplished with a minimum of wear on the contacting parts. In this study, Al powder, Al bronze powder and Mo powder used in general for automobile brake was sprayed on automobile brake disc to restrain rust and to maintain friction performance. Dynamo and corrosion tests have been carried out. It is concluded that the sprayed disc with Al bronze powder has the most improved frictional performance and anti-corrosive characteristics. The main results obtained can be summarized as follows; 1. From the corrosion current density test for gray cast iron and sprayed disc with powders of Al, Al bronze and Mo, it was cleared that the spray treatment with Al bronze powder showed the most superior anti-corrosive characteristics than other powders. 2. By anode polarization toward the noble direction from corrosion potential, corrosion current density with sprayed brake disc by Al-bronze powder was the lowest. 3. Mean frictional coefficients obtained from dynamo test are as follows : the sprayed disc with Al(99.99%) powder was 0.190 ; the sprayed disc with Al-bronze powder was 0.312 ; the sprayed disc with Mo powder was 0.257 ; the non-sprayed disc of gray cast iron was 0.331. In the case of the sprayed disc Al-bronze powder showed the most excellent frictional characteristics . 4. Amount of burnish quantity obtained from burnish test by dynamometer is as follows : the sprayed disc with Al-powder was 1.079 mm : the sprayed disc with Al-bronze powder was 0.155 mm : the sprayed disc with Mo powder was 0.253 mm : the non-sprayed disc of gray cast iron was 0.241 mm. Al-bronze powder also showed the most excellent burnish characteristics.
김윤해 한국마린엔지니어링학회 1998 한국마린엔지니어링학회지 Vol.22 No.2
Filament winding method is widely used for composite fabrications using low viscosity liquid for-mation and processing asymmetrical structures of pressure vessel pipe rocket motor case etc. The filament winding method is affected by several parameters such as pot life of process time viscosi-ty of resin filament winding temperature and schedules curing condition and post curing condi-tion of resin. To develope high functional composite materials the rotation(5, 15, 20, 30rpm) of the winding machine was controlled by D.C motor. And the wiper to give proper tension was equipped between strand and resin bath. The resin is hooked by the design wiper. The adequate cure schedule was found by DSC. NOL ring test is carried out to investigate the basic physical properties such as design technology. The void contents in filament winding is generally higher than that of the prepreg laminated plate. These high contents of void can make a crack in resin in spite of low deformation. These problem was solved by giving tension in processing. To improve the characteristics of fiber volume fraction void contents resin/fiber bonding the winding speedc is changed under constant tension. It was found that resin impregnation was not different from in fiber contents void contents at the range of 0.5~1kg tension but it was found that resin was not impregnated at the above of 1.5kg tension. In burst test a pure PE liner was failed at a nozzle part under the $14kg/\textrm{cm}^2$ pressure but a pressure vessel of CNG was failed at a cylinder part under the $200kg/\textrm{cm}^2$ pressure.
김윤해 한국마린엔지니어링학회 1994 한국마린엔지니어링학회지 Vol.18 No.2
In this paper, rotating-bending fatigue tests of the SiC-whisker- reinforced 6061-T6 aluminum alloy and 6061-T6 alumiunm alloy made by power metallurgy were carried out to investigate the fatigue characteristics of plain and notched specimens at room temperature. The fatigue mechnisms in both materials were clarified through successive surface observations using the plastic replica method. In the case of the SiC-whisker-reinforced composites, there are whisker rich and poor zones and the fatigue crack is nucleated from the end of whiskers near the boundary. On the other hand, in the case of the 6061-T6 aluminum alloy, the fatigue crack is nucleated from defects and propagates by shear. Moreover, the results were discussed based on linear notch mechanics.
Idea Factory를 통한 산학 협력 연구 활동(소재의 적절한 선정을 통한 버터플라이 밸브 디스크의 최적화 모델링)
김윤해,박창욱,배창원,김한솔,정민교 한국공학교육학회 2016 공학교육연구 Vol.19 No.6
This research is one of the Industry-University cooperation in idea factory of Korea Maritime and Ocean University. Idea factory of Korea Maritime and Ocean University is trying to train creative talented students and discover ingenious ideas. The contents are consisted of the possibility for the replacement of a metal valve disk to composite valve disk in butterfly valve based on the diversification. Purpose in this study is to predict failure field by each fly by appling Tsai-Wu Failure Index.