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오병택,문병주,이동일,Oh, B.T.,Moon, B.J.,Lee, D.I. 한국전자통신연구원 2002 전자통신동향분석 Vol.17 No.6
최근 인터넷 환경의 빠른 성장과 함께 더욱 다양하고 많은 콘텐츠들이 개발되고 있다. 반면에 디지털 데이터의 특성상 복제가 쉽고 또한, 불법적으로 복제된 콘텐츠가 인터넷을 통해 빠르게 배포되고 있다. 이에 멀티미디어 데이터에 대한 소유권 문제와 이를 효율적으로 보호하고, 디지털화된 콘텐츠의 불법 복제를 제한하기 위한 방법이 요구되고 있다. 본 고에서는 워터마크 기술이란 어떤 것이며 이와 관련된 국내외의 기술동향과 전망에 대해서 알아본다.
오병택(B.T. Oh),홍성호(S.H. Hong),양영명(Y.M. Yang),윤인수(I.S. Yoon),김영균(Y.K. Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.11
Korea Gas Corporation(KOGAS) had successfully developed and built a pilot Liquefied Natural Gas(LNG) storage tank(membrane type above ground tank having a capacity of 1,000㎥). Through the development and operation of the pilot LNG storage tank, KOGAS had developed membrane for the commercial LNG storage tank having a capacity of 140,000㎥ For the development of commercial membrane, analytical and experimental studies had been performed to investigate the strength of the commercial membrane and the reaction force at the anchor point. The stress analysis of the corrugated membrane shapes which are subjected to the cryogenic liquid pressure and thermal loading was performed to ensure the stability and fatigue strength of the commercial membrane by using nonlinear FEM code and experiments. On the basis of engineering and experimental data obtained from the pilot LNG storage tank, this paper is focus on the general design process of commercial membrane units.
Pilot LNG저장탱크에 기초한 사용 LNG저장탱크의 설계
오병택(B.T. Oh),홍성호(S.H Hong),양영명(Y.M. Yang),윤인수(I.S. Yom),김영균(Y.K. Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
KOGAS has developed the LNG storage tank, and now, successfully built a pilot LNG storage tank with 1,000m3 capacity. Now, the research for commercial LNG storage tank with 140,000m3 capacity is needed So, both analytical and experimental studies have been performed to investigate the strength of the new membrane for commercial one and the reaction force at the anchor paint. Using nonlinear FEM code and experiments, the stress analysis of the new corrugated membrane shapes subject to the cryogenic liquid pressure and thermal loading are perform ed to ensure the stability and fatigue strength of the new membrane. This paper reports an the general design process of commercial membrane units using the result from plot LNG storage tank operation.
오병택(B.T. Oh),윤인수(I.S. Yoon),김성훈(S.H. Kim),남재형(J.H. Nam) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
LNGC(LNG Carrier) is a popular means of LNG transportation today and becomes of great importance to us in accordance with increase in LNG consumption. KOGAS has developed and improved the design of CCS(Cargo Containment System) for many years with the major shipyards. Inside of LNG-CCS, there are two major structural systems. One is a membrane-insulation containment structure and another is a pump tower structure. Especially, the pump tower structure consists of an emergency pipe, a filling pipe, two discharge pipes, several equipments for loading and unloading LNG and tubular members to join the main pipes. For the structural analysis of pump tower, sloshing load should be obtained from sloshing analysis and also additional loads should be considered such as inertial force due to ship-motion, thermal load and gravitational force from ship inclination. In this paper, the difference with the traditional pump tower of LNG-CCS is introduced to explain the design concept of KC-1 pump tower structure.
The Design and Assessment Procedure of LNG Carrier Pump Tower System
B.T.Oh(오병택),I.S.Yoon(윤인수),S.H.Kim(김성훈),J.H.Nam(남재형) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
A membrane-typed LNG carrier (LNGC) has two main structures in its Cargo Containment System (CCS); insulationmembrane structure and pump tower structure. The former structure typically needs to have liquid-tightness and vaportightness in order to prevent LNG or NG from leaking toward the outside of it and hand sloshing loads and hydrostatic pressure from LNG over to a hull structure. Of course, it should have a good cryogenic characteristic to contact with LNG directly. The latter structure consists of liquid-dome cover, four main columns (tower structure), bottom plate and bottom supports. Generally, the main columns are two discharging columns with pumps, one filling column and one emergency column. Several sensors, detectors and ladders are attached to them. In this paper, the design and strengthassessment procedure of a pump tower structure is introduced to understand KC-1 LNGC easier.
LNG저장탱크 Heating system 활용에 관한 연구
오병택(B.T. Oh),윤인수(I.S. Yoon),김영균(Y.K. Kim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
In case of above-ground and in-ground type LNG storage tanks, a heating system should be installed because they have to be filled with cryogenic liquid, LNG. The cryogenic temperature of LNG might be transferred to the interface between concrete bottom slab and soil, and it can make the soil frozen. This phenomenon is called ‘Ice-Lens’. Ice-Lens caused by the volume expansion of the frozen soil can lift up the concrete structure or the equipment of LNG storage tank. Therefore, a heating system should be installed around the LNG storage tank to prohibit the Ice-Lens phenomenon. A heating system is operated in order to confine the growth of the frozen area within a design range, as is mentioned above. However, tank-open situation might occur during the commercial operation of LNG storage tank because of several reasons; the repair or the replacement of the equipment, etc. At this time, the heating system can be changed into a freezing system to protect the frozen area which works as a shield against the water penetration. The frozen area is essential for the LNG storage tank to prohibit the water penetration, but it shouldn’t be larger than necessary. In this paper, the heating and freezing processes will be introduced which were experienced by KOGAS