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용접조건에 따른 고장력강 용접부의 기계적 성질 및 수소유기 응력부식귀열 (應力腐食龜裂) 저항성 변화
박동환,권해욱,백광기,서창교 대한금속재료학회(대한금속학회) 1988 대한금속·재료학회지 Vol.26 No.10
The effect of welding condition on mechanical properties and Hydrogen Induced Stress Corrosion Cracking (HISCC) resistance of Heat Affected Zone (HAZ) in high strength steel weldment was studied. Multi-pass Submerged Arc Welding of A5l6 Grade 70 steel plate with different heat input of 30, 40, 50 KJ/㎝ were carried out, which were followed by Post Weld Heat Treatment (PWHT) for 2 hrs at 630 ℃. As the heat input during welding was increased, the impact energy and hardness at HAZ were decreased, on the other hand, the hardness was decreased and both the impact energy and the resistance of HISCC were increased. With proper selection of welding heat input and PWHT, better results of the resistance of HISCC and Charpy V notch impact energy of HAZ can be obtained.
朴東煥 연세대학교 대학원 1977 延世論叢 Vol.14 No.1
Two main traditions can be distinguished in the recent history of social and/or human sciences. Those diverging traditions are between those who maintain as their scientific goal the discovering of universally applicable general laws and those who emphasize on the individual and unique features observable in the object. Such issue has also divided Korean social scientists into two alternate positions. That is, whether (1) the believed universal laws and theories of the western social science can be applied cross-culturally or (2) each society or culture is to be understood in terms of its own unique features and qualities. Reformulated, the issue is whether Korean social scientists' cross-cultural adoption of the laws and theories of the western social science can be justified. The various western philosophers' analyses of universals and universally claimed concepts and theories have been utilized in the attempted solution. It has not been attempted, however, to resolve the issue in terms of one alternate of those opposing positions. The present paper presents a compromise theory, holding as the evidential frame of reference the particular oriental culture and society changing in confrontation with the universalist tendency of western culture.
박동환,권혁동,권혁홍 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.20 No.5
Hot forging is a processing of plastic deformation for the metal at recrystallization temperature or higher. It is possible to decrease the flow stress and energy required to form the material at elevated temperature. But cold forging can improve mechanical properties, excellent dimensional accuracy, and surface quality. Main advantage of hot–cold complex forging is that it is able of large deformation with less force, and improved mechanical properties and dimensional accuracy. In general, complex forging for combining cold forging and hot forging of small bar can improve the shape accuracy of forged parts. In this study, the material loss and the production time were high in the conventional cutting process, but cam ring gear parts of large diameter for truck clutch were developed by applying the hot–cold forging technology. The complex forging technology of cam ring gear parts would be very useful to improve dimensional accuracy, reduce manufacturing cost, and increase die life.
政策科學(the policy sciences)의 기초적 과제에 대한 試案 : 社會科學과 哲學의 통합개념으로서의 갈등. 조직, 결정
朴東煥 弘益大學校 1973 弘大論叢 Vol.5 No.-
Many contemporary philosophers are concerned with a purely linguistic or axiomatic analysis of the systems of knowledge and value. They accordingly tend to consider the problem of philosophy unique and independent of other problems og men and society. In this article, it is contended that philosophers various systems of value and knowledge be considered to be the by-products of the quest for solution of such pressing problems as labor-management disputes, international and intergroup conflictot ideology, confrontation of government and its constituent people, etc. From such a standpoint, philosophy os a practical and social enterprise, an integral part of a whole human activity of problem-solving. It is therefore attempted at making the philosophical studies of value and knowledge relevant to the problems of policy decision in social situations snof man. Conflict, organization, and decision are found to be the most important philosophical concepts to constitute the main problems of the policy sciences. We reviewed a brief history of western political philosophy in order to introduce a classical concept of conflict, organization, and decision. But it is understood that the tradition of political philosophy is not the onlyresource in which the original concepts of the policy sciences are found. Finally, a current view of the policy sciences is sidcussed as the common concern of the philosopher and the social sciertist.