Systems Approach to Technology Transfer -The Role of Financial Institutions-

Koo,Ja Yoon구자윤 숭실대학교부설 사회과학연구소 1993 社會科學硏究 Vol.11 No.1

Economic Integration of North and South Korea and Prospectsfor Northeast Asian Economic Development

Kuark, John Y.T.Koo, Ja Yoon구자윤 崇實大學校 統一問題硏究會 1994 統一硏究 Vol.2 No.-

C3H 생쥐에서 자외선 B의 집중조사와 분할조사가 표피내 랑게르한스 세포의 회복에 미치는 영향

구상완,한승경,박윤기,조무연 ( Sang Wahn Koo,Seung Kyung Hann,Yoon Kee Park,Moo Yon Cho ) 대한피부과학회 1991 대한피부과학회지 Vol.29 No.4

N/A The Effect on the Recovery of Epidermal Langerhans Cells in C3H Mice after Single and Fractionated Exposure of Ultraviolet B Irradiation Sang-Wahn Koo, M.D., Seung Kyung Hann, M.D., Yoon-Kee Park, M.D., Moo Yon Cho, M.D. Department of Dermatology, Yonsei University College of Medicine Seoul, Korea The study was undertaken to see the recovery in epidermal Langerhans cells in relation to time after UVB irradiation through different amounts and ways of exposure in C3H mice. We irradiated the ears of C3H mice with UVB 200mJ/㎤ and 400mJ/㎤ in a single dose at one time and 5 fractionated doses for 5 days and 10 fractionated doses for 10 days and performed biopsies on the ears of the control and experimental groups after, 2, 7, 14, 21 days of irradiation and stained them by the immunoperoxidase method. The results are summarized as follows. 1. A more significant decrease in the number of Ia-positive epidermal Langerhans cells was observed in single-dose-exposed group than fractionated-dose-exposed groups on the second day of irradiation. 2. On the seventh day of exposure, the number of the Ia-positive epidermal cells in single-dose-exposed group returned to normal, but in fractionated-dose-exposed groups the number of Langerhans cells decreased most remarkably. 3. In fractionated-dose-exposed groups, the number of Langerhans cells returned to normal on the 14th or 21st day of expposure. (Kor J Dermatol 29(4) : 459-465, 1991)

폐FRP로부터 친환경적 유리섬유 추출 공정 개발

尹救永 弘益大學校 産業技術硏究所 2004 産業技術 Vol.14 No.-

The FRP(fiber-reinforced plastic) is one of the best composite material which has advantages in excellent durability, corrosion-resistant, plasticity, used for important fields with the focus material. But FRP has a tendency to be used as structure stuff nowadays. An annual wastes of FRP in Korea are more than 100,000 tons, but it estimates the almost about 100,000 tons are been abolished. It is fact that most of FRP wastes are depended on incineration or reclamation. Because it is made up of reinforced fiber like glass, it is difficult to break into pieces. By disposing of useless FRP this way, it occurs secondary problem such as environmental pollution. To solve the problems, research on recycling method has been carried out, recycling FRP wastes by grinding into powder, it can be applied to lightweight plastic or intense building materials. Accordingly, the aim of this research is to develop actual manufacturing technique about the cement reinforcement fiber which is made from FRP wastes.

새로운 치형을 이용한 헬리컬기어의 저진동화 연구

尹救永,柳承玹 홍익대학교 산업기술연구소 1997 産業技術 Vol.7 No.-

A method of minimizing transmission error in helical gears is presented in this work. Using the concept of optimal modification of the plane of action to generate the new tooth profile, the idea of perfect plane of action of helical gears is introduced. The proposed method constitutes a general tooth correction method and makes the design, unlike other modification schemes presented in the literature. less complex, less sensitive to dynamic factors and retains the involute characteristics. Also the new method proposed in this work permits easier cutting of the tooth profile because of the simplicity of the process.

기어 시스템의 동적거동 해석

尹救永,朴旺濬 홍익대학교 산업기술연구소 1996 産業技術 Vol.6 No.-

The area of gear dynamics has recently been the focus of many studies. The proper kinematic and geometric design of gears, the mathematical modeling of gear system are essential for a good design. This work present a gear design for reducing noise, practical approaches, and Win95 based simulation program that using basic design variables. Especially this program enables dynamic analysis based on G.U.I. A new tooth profile modification is proposed for reduction vibration and noise of involute gears. The method is based on the use of cubic spline curves. The tooth profile is constrained to assume an involute shape during the loaded operation. Thus the new gear profile assures conjugate motion at all points along the ling of action. The new profile is found to result in a more uniform static transmission error compared to not only standard involute profile but also modificated profile thereby contributing to the improvement of vibration and noise characteristics of the gear. A dynamic analysis of the gear drive with the involute tooth and the modified tooth profile(using cubic splines) is performed to establish the fact that a reduction in the transmission error reduces the gear vibration and noise due to smaller dynamic tooth loads during a meshing cycle. For this, first the tooth deformation is found and then the tooth dynamic load is determined for all resonable speeds. A parameter study in also conducted to establish the superiority of the cubic spline(C.S) based gear profile over the involute profile a well as those based on the use of linear and parabolic tip reliefs.

폐FRP로부터 친환경적 유리섬유 추출 공정 개발

尹救永 弘益大學校 産業技術硏究所 2005 産業技術 Vol.15 No.-

The trend of using FRP (Fiber Reinforced Plastics) that range of high mechanical strength and corrosion resistivity and superior molding is now widening. But FRP has a serious problem to be used as structure stuff nowadays. An annual wastes of FRP in Korea are more than 100,000 tons, but it is believed that the most of waste are been abolished without the appropriate treatment. It is fact that most of FRP wastes are depended on incineration or reclamation. Because it is made up of reinforced fiber glass, it is very difficult to break into pieces. By the disposing of waste FRP this way, it also occurs secondary problem such as air pollution. For these reasons, the research of FRP recycling field is now focusing on FRC(fiber reinforced concrete) that use disposed FRP. This study is to show a process of manufacturing and practical using for FRC from the waste FRP.

저진동 저소음을 위한 기어시스템의 서계 자동화 연구

尹救永,柳承玹 홍익대학교 산업기술연구소 1998 産業技術 Vol.8 No.-

Minimizing vibration of a reduction gear system, has frequently been the focus of many studies as well as for a good, efficient strength design of reduction gear elements. This work presents new reduction gear system design for reducing vibration and fully automated determination of machine elements with a G.U.I technique. A new CAD simulation is based on minimizing Transmission Error (T.E) of the reduction gear system, which is understood as a principal factor of gear vibration and noise. Also using the Visual C++ Language, new G.U.I computer simulation is developed for the reduction gear designer who are not much experienced in the work. The procedure of new CAD program assures the reliability of the traditional reduction gear system design, and more uniquely considers the better performance in the vibration. The new method can be applicable to all machinery design with a reduction gear system on condition that the machine elements have been analyzed in the point of strength.

신뢰성 향상을 위한 부품관리 연구

尹救永 홍익대학교 산업기술연구소 2001 産業技術 Vol.11 No.-

Reliability based optimum design for manufacturing systems is one of the most demanding field by manufactures. The manufacturing cost is the most dominant factor for company. Nevertheless the object is highly asked to be solved, the answer is not a simple one at all. Because the production process is usually very sophisticated and the production cost is combined with several part production process. Therefor traditional approach is mainly trying to reduce the failure vrate, but that is very costly method. Also that method hasn't know the relation between the cost of improving productivity and the cost of the control of failure.Here we used the Monte Carlo Simulation method for revealing the relation between the cost of failure and the control of that. We adopted the real process plan from a battery manufacturing company. Then the method is successfully applied to that process. Therefore We have very remarkable success to increase the productivity and reduce the control of failure. This simulation can be easily introduced to other manufacturing process and field These kinds of research will be an important area to the future work. Our methodology is going to increase our manufacturing flexibility and efficiency. It is our success that will continue to make us a leader in newly engineered study.

미세절제술과 비교 유전자 보합법에 의한 각종 종양에서의 유전자 변화에 관한 연구

구선회,신소영,임춘화,전영미,이윤이,김진만 충남대학교 의과대학 지역사회의학연구소 2000 충남의대잡지 Vol.27 No.2

For the evaluation of oncogenesis, progression and prognosis of cancer, CGH is an important technique, because this technique is economic due to utilization of only one probe and lack of culture, screening mathod of whole genome and possibility of retrospective and prospective study. By the CGH, genornic variation of 20 breast cancer tissues, 23 stomach cancer tissues and 16 bladder cancer tissues were analyzed. The results were as followes ; 1. breast cancers The CGH results showed gains on chromosomes 8q(40%), lq(30%), 17q(15%), 20q(15%), 18q (15%), 5p(15%), and 13q(15%). The Deletions were on chromosomes 17p(45%) and 22q(20%). High-level amplifications(green/red ratio >1.5) were noted on chromosomes 1p31, iq, 3q25-qter, 5p, 7q31-qter, 8q, 9q22-qter, 10p, l1p, 11q22-qter, 12p, 12q24, 14g21-qter, 15q23-qter, 17q, 18p, 18q12-qter, 20p, and 20q. By comparison with infiltrating ductal carcinoma, the two medullary carcinomas showed high-level amplification on chromosomes iq3l, lq, 8q, 10p, 11p and 12p. 2. stomach cancers 1) Usual amplification sites of genome were lq, 13q, 17q, 20p,q. 2) 17p was the most common deletion site. The other sites of the deletion were lq, 4q. 3) In intestinal type of stomach cancer, genomic variation is more common than diffuse type. 4) In the cases of no evidence of lymph node metastasis, deletion of 17p is absent but amplification of 8q is obvious in the case of lymph node metastasis. 3. bladder cancers Common amplification of copy numbers of DNA sequences by CGH were seen at 1q, 3q, 4q, 5p, 6pq, 7p, 8q, 11q, 12q, 13q, 17q, 18q and 20pq(more than 20% of cases). High level amplification was noted at 1p32, 3p2l, 3q24, 4q26, 8q21-ter, 11q14-22, 12q15-21, 12q21-24, 13q 21-31, 17q22, and 18q22. Deletions were noted at 2q21-qter, 4q13-23, 5q, 8p12-22, 9pq, 11p13-15 (more than 20% of cases).