급냉 연속 주조된 페라이트 스테인레스강 판재의 조직 및 인장성질에 미치는 Cr 함량의 영향

오명석,전병완,이태행,조성석 ( Myeong Suck Oh,Byeong Whan Jeon,Tae Haeng Lee,Seong Seock Gho ) 한국주조공학회 1988 한국주조공학회지 Vol.8 No.1

Using the twin-roller type melt-quenching technique, we investigated the effect of Cr content on the microstructure and tensile properties of ferritic stainless steels, whose thickness is 0.5㎜ has been investigated. In this experiment, the three kinds of ferritic stainless steels has been used. The predicted cooling rates of melt-quenched ferritic stainless steels were not changed, even the Cr content increases up, to 25%. The metastable phase of the melt-quenched ferritic stainless steels were changed depending upon the car Cr content. In case of 17% Cr steel, the metastable phase was martensite and in case of 20 and 25% Cr steel, the metastable phase was austenite. After heat treatment, the tensile properties of the melt-quenched stainless steels are better than those of conventional ferritic stainless steels.

고압에서의 나트륨계 흡수용액의 이산화탄소 흡수특성

오명석(Oh, Myoung-Seog),이진우(Lee, Jin-Woo),차왕석(Cha, Wang-Seog) 한국산학기술학회 2009 한국산학기술학회논문지 Vol.10 No.3

나트륨계 흡수용액의 이산화탄소 흡수특성을 알아보기 위하여 회분식 기-액 흡수평형 반응기를 이용하여 Na₂CO₃ 5%, 10%, 15%, 20% 수용액에 대한 이산화탄소 흡수능 및 초기흡수속도를 측정하였으며 반응온도는 40℃이였다. 또한, 알칼리염계 흡수제(KHCO₃, CaCO₃, K₂CO₃)들의 혼합에 따른 초기흡수속도를 비교하였다. 농도에 따른 실험결과 10%의 Na₂CO₃에서 가장 좋은 흡수능 및 흡수속도를 보였고, 알칼리염계 흡수제들 중에서 K₂CO₃와 혼합할 때 흡수속도가 다소 증가되었다. Na₂CO₃ 5% 용액의 초기흡수속도를 개선시키기 위하여 Pz와 Pp를 각각 첨가하여 실험한 결과, 증진제를 첨가함으로써 초기흡수속도를 증가시킬 수 있었다. The absorption capacity and initial absorption rate in 5 %, 10 %, 15 % and 20 % Na₂CO₃ under the constant temperature at 40℃ and the initial absorption rate in mixture of different alkaline salts such as KHCO₃, CaCO₃ and K₂CO₃ were measured using batch type stirred cell contractor. 10 % Na₂CO₃ showed the highest absorption capacity and Na₂CO₃ and K₂CO₃ showed the somewhat increased absorption capacity and initial absorption rate respectively. Further more, we have studied the effect of adding Pz and Pp to Na₂CO₃. The result showed that absorption rate of CO₂ was increased by adding these additives.

ABR과 UBR 서비스 상에서의 TCP 프로토콜의 성능 개선

오명석(Myong-Suk Oh),전흥진(Heung-Jin Jeon),육동철(Dong-Cheol Yuk),박승섭(Seung-Seob Park) 한국멀티미디어학회 1999 한국멀티미디어학회 학술발표논문집 Vol.1999 No.2

H.264/AVC의 효율적인 파이프라인 구조를 적용한 CABAC 하드웨어 설계

오명석(Myung-Seok Oh),이원재(Won-Jae Lee),정윤호(Yun-Ho Jung),김재석(Jae-Seok Kim) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11

This paper proposes CABAC Encoder for H.264/AVC using efficient pipelined architecture. The proposed architecture has two techniques to implement efficient pipelined architecture. The one is reducing pipeline latency by calculating probability quickly. The other is fully pipelined implementation when the type of the encoded symbols is LPS. By adapting two techniques, the processing time of the proposed architecture is reduced by about 27% compared with the previous architecture.

이슬람보험의 계약적 형태와 샤리아 아비트리지 : 이슬람적 증여와 공유 개념을 중심으로

오명석(Oh, Myung-Seok) 한국이슬람학회 2021 한국이슬람학회논총 Vol.31 No.3

Islamic insurance or Takaful has been developed as an alternative to conventional commercial insurance since the 1980s. As Islamic jurists(ulama) have resolved that conventional insurance should not be permitted because of excessive gharar(uncertainty) inherent in the sale of risk characteristic of insurantial contract between the insurer and the insured, they have attempted to formulate a shariah-compliant insurance based on the principles of gift(tabarru or hibah) and cooperation(taawun), which makes Islamic insurance similar to mutual insurance or cooperative insurance in its contractual form. This paper analyzes the legalistic logic adopted by Islamic jurists in order to apply the Islamic concepts of gift and sharing to insurance. In evaluating this process, I will base my analysis on the notion of shariah arbitrage, which means to negotiate and arbiter differences and gaps between shariah regulations and the lived realities. I am particularly interested in the phenomena that shariah arbitrage which seems to be successful creates a new difficulty and contradiction, and needs further shariah arbitrages, while the opinions of Islamic jurists have divided on what is proper shariah arbitrage for authentic Islamic insurance. This phenomena is clearly evident in the shariah arbitrages employing diverse notions of Islamic gift, such as gift promise(iltizam tabarru), gift with rewards(hibah thawab), and conditional gift(hibah muallaqa) to legitimize the tabarru model of Takaful. Conscious of logical contradictions difficult to be solved in the tabarru model, there has been a recent trend among Islamic jurists to establish Takaful on the principle of cooperation(taawun) or sharing(nihd) rather than on the principle of gift. This formulation makes Takaful closer to mutual insurance or cooperative insurance, and involves less shariah controversies. However, it occurs that the principle of taawun mainly remains in terms of the form of contract, but hardly reflects in the operational governance of takaful where takaful participants have little say in the management of takaful operators who are corporate companies much like conventional insurance companies. This shows another gap between shariah arbitrage and structural reality prevalent in the dual insurantial system adopted by most Muslim countries where Takaful has been introduced.

동남아의 수피즘

오명석 ( Myung Seok Oh ) 한국이슬람학회 2013 한국이슬람학회논총 Vol.23 No.2

Sufism has played an important role in the dissemination and development of Islam in Southeast Asia. This paper begins with the metaphysics of Sufism, known as the thesis of ``Unity of Being``(wahdat al-wujud) by Ibn al-Arabi, which was interpreted by Malay sufi writers in the 17th century. Then, I focus on how this abstract knowledge has been expressed as visible images in magical practices, literatures, shadow plays(wayang), and everyday rituals like slametan in Indonesia. Against the view that the ``traditional Islam`` or Kejawin Islam in Indonesia is a syncretic Islam where Islam is a veneer while Hinduism and animism comprise the content, I stress that shariah-minded Neo-Sufism has deeply penetrated into the ``traditional Islam`` in Indonesia. Despite of criticism of modernist Islam and Islamic revival movement(dakwah) in the 20th century, Sufism in Indonesia has managed to survive with its institutional base(pesantren and Nahdlatul Ulama). Recently, there emerges a revival of Sufism especially among the urban middle class in Indonesia, which involves innovative practices adjusting to modern urban life. In contrast to the conventional Sufism, this new trend can be called as ``urban Sufism``.

ATES 열펌프 시스템 성능 및 경제성 분석에 관한 연구

오명석(Myungsuk Oh),최종민(Jong Min Choi) 대한설비공학회 2012 설비공학 논문집 Vol.24 No.4

The aim of this study is to investigate the performance of a heating and cooling system with aquifer thermal energy storage(ATES heat pump system) known as one of the underground thermal energy storage application systems. The ATES system was composed of heat pump unit and ATES, which was installed in a factory building located in Anseoung. The system represented very high heating and cooling performance, and showed nearly constant COP at each heating and cooling season due to the stability of EWT. The economic analysis about an ATES system and a conventional system was also executed. The conventional system adopted an air-conditioner in the summer season and a LNG boiler in the winter season. The payback period of the ATES system was estimated by 6.62 years.

연소전 조건에서 알칼리염계 흡수제의 CO₂ 흡수특성

오명석(Oh, Myoung-Seok),백근호(Back, Guen-Ho),차왕석(Cha, Wang-Seog) 한국산학기술학회 2008 한국산학기술학회 학술대회 Vol.- No.-

주요 온실가스인 이산화탄소를 회수 및 저장(Carbon Capture and Storage)하는 기술은 주로 적은 CO₂농도를 가지는 연소후 포집공정이 개발 및 적용되었으나, 최근에는 보다 적극적으로 이산화탄소를 분리하기 위하여 연소전 석탄가스화복합발전(IGCC)과 같은 공정에 적용하여 반응공정 중에 생성되는 높은 농도의 CO₂를 분리하는 공정이 선진국을 중심으로 활발히 연구가 진행되고 있다. 본 연구에서는 고압의 연소전 조건에서 아민계보다 흡수속도는 느리나 생성가스에 유입되는 O₂, SOx, NOx에 의한 부반응 현상, 휘발에 의한 손실, 열적 열화현상이 나타나지 않는 알칼리염계 흡수제의 CO₂ 흡수특 성에 대하여 연구하였다.

절삭공구의 열변형 오차 및 절삭력 변형 오차에 관한 연구

오명석(Myung-Seok Oh),윤인준(In-Jun Yoon),백대균(Dae-Kyun Baek) 한국산업융합학회 2002 한국산업융합학회 논문집 Vol.5 No.4

This paper presents a method to predict tool deflection induced by the thermal distribution and the cutting force using FEM in milling operation. The thermal distribution of cutting tool was predicted using FEM after measuring the temperature of the end of tool and of the tool holder. The thermal deflection of cutting tool was predicted using FEM as well. The tool deflection induced by the cutting force was analyzed with the solid model of cutting tool. An end mill tool caused most of tool deflection comparing to tool holder. Most of thermal deflection came from Z-direction and most of tool deflection induced by the cutting force came from X and Y direction. Precision cutting will be accomplished when tool locations are generated considering the thermal deflection of cutting tool and the tool deflection induced by the cutting force in CAD/CAM.

선삭시 미스트 발생특성에 미치는 절삭변수의 영향

오명석(Myung-Seok Oh) 한국산업융합학회 2004 한국산업융합학회 논문집 Vol.7 No.1

The presence of cutting fluid for cutting tool and workpiece leads a temperature decrease, and reduces tool wear and residual stress. Moreover, it disposes chips from cutting area, and reduces thermal distortion. However, in manufacturing, cutting fluid used in cutting process is undesirable for both human and environmental aspect. Also, it's not economic for cutting cost.<br/> This paper studied experimentally the effects of cutting parameters on the characteristics of mist generation in turning. The results of experiment are as follows: 1) The more severe cutting conditions the more mist generate, 2) The ratio of weight concentrations of cutting fluid nearly have no an effect on the amounts of mist generation 3) The size of SMD is not affected by cutting parameters.