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극초단파의 출력과 적용시간이 의치상용 레진의 물리적 성질에 미치는 영향
정대성,임장섭,정창모,전영찬,Jeong, Dae-Sung,Lim, Jang-Seop,Jeong, Chang-Mo,Jeon, Young-Chan 대한치과보철학회 1999 대한치과보철학회지 Vol.37 No.6
The purpose of this study was to evaluate the effect of wattage and curing time on surface hard-ness, three-point bending strength and internal porosity of microwave curing denture base resin. Two sizes of resin specimens were made of Acron $MC^{(R)}\;;\;3.5{\times}10{\times}60mm$ for surface hardness and three-point bending strength measurement and $5{\times}12{\times}60mm$ for internal porosity measurement. They were cured by microwave energy at varing wattages(500W, 700W) and curing times(2min., 3min., 4min.) to determine if a certain wattage/curing time combination would improve physical properties. Surface hardness was measured with Vikers hardness tester, three-point bend-ing strength with universal testing machine and internal porosity was calculated by measuring the weight in air and in water. The results obtained were as follows: 1. There was no significant difference in percent porosity among experimental groups(p>0.05). 2. 500W/3min. group showed the higher surface hardness than 700W/2, 3, 4min. groups(p<0.05), and 700W/4 min. group showed the lower surface hardness than 500W/2, 3, 4min. groups(p<0.05), but there was no significant difference among others(p>0.05). 3. 500W/3min. group yielded the higher value of bending strength than 500W/2min., 700W/3, 4min. groups(p<0.05), but there was no significant difference among others(p>0.05).
RC 고형 거더교의 내하력 평가를 위한 재하시험과 Proof Load Test
정대성 ( Jung Dae-sung ),최정길 ( Choi Jung-gil ),장정환 ( Jang Jeong-hwan ),김철영 ( Kim Chul-young ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.1
The purpose of this study is to provide a basic data to evaluate realistic load-carrying capacity of bridges by load test. The conventional diagnostic load test, resonance test, and proof load test were carried out on the Ssanggye-1 bridge (RC T-girder bridge). In this paper, general description of test procedure and results are described. More detailed analysis will be followed by other participants of this project.
정대성 ( Dae Sung Jeong ) 한국윤리학회 2015 倫理硏究 Vol.102 No.1
본 논문에서는 인류의 지속가능한 삶을 위해 요구되는 환경윤리를 모색해보고자 하였다. 우선 환경문제의 성격을 종합적으로 정리해 보고 지구의 지속 가능한 한계를 초과했다는 점에서 환경문제의 심각성을 지적하였다. 그리고 환경문제의 원인을 세계관의 차원, (경제)성장의 한계 도달(초과), 인간적 제약이나 한계 등 세측면으로 포착해 고찰해보았다. 전반적 환경 악화의 비관적인 현실 속에서도 한편으로 우리에게 희망을 주는 환경 관련 세태나 동향을 소개하였다. 다음으로 환경문제 해결 방안을 의식적 측면과 제도적 측면으로 나누어 접근하고 지속 가능한 문명을 건설하기 위한 노력을 거시적, 미시적 관점에서 제시하였다. 마지막으로 환경윤리의 철학적 근거로서 인간중심주의와 생태중심주의의 변증법적 통합을 논하고 도덕교육에서 환경윤리가 점하는 위상 및 환경윤리를 위한 도덕교육의 방법을 시론적(試論的)으로 논하였다. In this essay, I tried to find the environmental ethics for sustainable life of mankind. First of all I arranged the nature of environmental problems synthetically and then pointed out the seriousness of environmental problems from a point of view that they exceed the sustainable limit of the earth. And I grasped and considered the causes of environmental problems in three aspect including the level of an outlook on the world, reaching(excess of) the limit to the (economical) growth, and the human restriction or limit. In spite of pessimistic reality of overall environmental deterioration, I introduced social conditions or trends that gives us hope. Next, I tried to approach the solution of environmental problems in the aspects of consciousness and institution and suggested the effort to construct sustainable civilization in macroscopic and microscopic viewpoint. And finally, I argued the dialectical integration between anthropocentricism and ecocentricism as the philosophical basis of environmental ethics and argued the status of environmental ethics in moral education and then the method of moral education for environmental ethics preliminarily.
EPP적용 LL-24형 경량화 등부표의 운동 안정성 평가
정대성 ( Dae-sung Jeong ),정세민 ( Se-min Jeong ),정상수 ( Sang-soo Jeong ),양재형 ( Jae-hyoung Yang ) 조선대학교 공학기술연구원 2017 공학기술논문지 Vol.10 No.3
Light buoys are equipped with lighting functions and a kind of navigation signs. By its shape and colors, the buoys show the route to vessels sailing nearby in the daytime, while by its lighting at night. It also plays a role in notifying the presence of obstacles such as reefs and shallows. Because the large buoy is mainly made of steel, it is vulnerable to the water and hard to handle for installation and maintenance. Moreover, the accidents of vessels’ collision with the buoys and damages of the vessels due to the material of the buoys, say steel, have been reported every year in Korea. In the this study, the newly developed lightweight light-buoys, combined with 7 nautical mile self-contained lantern, are introduced. To reduce the total weight, EPP(Expanded polypropylene) and aluminum are applied for the flotation section and tower structures, respectively. The new self-contained light system, whose weight is 10% of conventional power-separated light system, is adopting solar cells, high performance batteries, LED light emitters and so on. Hydrostatic calculations and motion analysis of the buoy in waves are carried out to find the optimum drafts and stabilizing weight since there is a mandatory regulation for the motion of the buoys.
정대성 ( Dae Sung Jeong ) 한국윤리학회 2010 倫理硏究 Vol.79 No.1
Kantism and Buddhism have something in common that they take the meaning of the world as the result of human cognition, having difference in ontological and epistemological perspectives. The cognition of subject can`t be perfect because of the epistemological limit in Kantism, but we can reach transcendental intuition with insight of emptiness and no self in Buddhism. Between two thoughts is difference in viewpoints about human influence on the universe, but similarity of implication that our cognition can jump in a sense. Kantian postulation theory can be used for solving the dilemma(aporia) of Buddhism, but this is transient. Becoming the member of the intelligible world is discontinuous in Kantism, but awakening is gradual in Buddhism. The ways of discipline are partly similar and different, common value is immortal morality. Kantism warns Buddhism about corruption by regarding morality as the essence of religion. Two thoughts are in humanism that demands self-realization by self transcendence.