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내부 유체 슬로싱 효과를 고려한 부유이송 해상풍력 기초의 동적 안정성 해석
홍석진,김동현,강신욱,강금석,Hong, Seokjin,Kim, Donghyun,Kang, Sinwook,Kang, Keumseok 한국전력공사 2016 KEPCO Journal on electric power and energy Vol.2 No.3
부유 이송식 해상풍력 기초를 목표 지점에 설치하기 위해서는 내부의 중공부에 해수를 주입하여 착저 시키게 되는데, 그 과정에서 중량 및 무게 중심과 부력중심이 변하게 되어 부유식 기초가 불안정해 질 수 있다. 부유 이송식 기초의 동적안정성 해석은 기초 외부의 수력학적 하중과 6-자유도 운동을 하게 되는 기초에 작용하는 파도와 조류 하중 및 설치 과정에서 기초 내부의 중공부로 투입되는 해수의 무게중심 이동까지 동시에 고려해야 하는 복잡한 문제이다. 따라서 본 연구에서는 3차원 비정상 CFD 기법과 다물체 동역학 기법을 연성 (coupling)한 정밀 해석기법을 적용하여 부유 이송식 기초 내부 물의 슬로싱 운동까지 고려한 동적안정성 해석을 수행하고 특성을 분석하였다. In order to install the floating transport type wind-turbine foundation, water pumping is used to sink the foundation. During this process, its mass and center of gravity, and buoyancy center become continuously changed so that the dynamic stability of the floating foundation become unstable. Dynamic stability analysis of the floating foundation is a complex problem since it should take into account not only the environmental wave, wind, and current loads but also its weight change effect simultaneously considering six-degree-of-freedom motion. In this study, advanced numerical method based on the coupled computational fluid dynamics (CFD) and multi-body dynamics (MBD) approach has been applied to the dynamic stability analysis of the floating foundation. The sloshing effect of foundation internal water is also considered and the floating dynamic characteristics are numerically investigated in detail.
Probit 분석을 이용한 ??유도탄 신뢰도 분석 및 활용방안
홍석진,정상훈,Hong, SeokJin,Jung, SangHoon 한국품질경영학회 2016 품질경영학회지 Vol.44 No.3
Purpose: The purpose of this study was to propose useful suggestions by analyzing reliability of guided missile using field data in Military industry. Methods: The collected data from Defense industry company and the military were analyzed using probit analysis which is non-linear model because field data contain binary variable. Results: The results of this study are as follows; It was found that the effect of time was significant. It takes about 12.4 years when 10st percentile of guided missiles are not working and it takes about 18.6 years when 50st percentile of guided missiles are not working. It was found that period between 10years to 15years comes less than reliability 0.0. Conclusion: Periodical check needs to extend from 4 year to 10 year partially. Early LOT need to check per 4 year and follow-up LOT extend the period of check to 10 year by reflecting the result of reliability.
Probit 분석을 이용한 OO유도탄 신뢰도 분석 및 활용방안
홍석진 ( Hong Seokjin ),정상훈 ( Jung Sanghoon ) 한국품질경영학회 2016 품질경영학회지 Vol.44 No.3
Purpose: The purpose of this study was to propose useful suggestions by analyzing reliability of guided missile using field data in Military industry. Methods: The collected data from Defense industry company and the military were analyzed using probit analysis which is non-linear model because field data contain binary variable. Results: The results of this study are as follows; It was found that the effect of time was significant. It takes about 12.4 years when 10st percentile of guided missiles are not working and it takes about 18.6 years when 50st percentile of guided missiles are not working. It was found that period between 10years to 15years comes less than reliability 0.0. Conclusion: Periodical check needs to extend from 4 year to 10 year partially. Early LOT need to check per 4 year and follow-up LOT extend the period of check to 10 year by reflecting the result of reliability.
직렬형 하이브리드 구동계 운송수단 개발을 위한 등가소비전략 연구
홍석진(Seokjin Hong),윤석호(Seokho Yun),최웅철(Woongchul Choi) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
Tourists who visited Thailand in November 2018 increased 23.2% year-on-year and can expect a surge in the use of two-wheeled vehicles, Thailand’s main means of transportation. As a result, air pollution in Thailand is serious and the Thai government has announced that it will replace 22,000 electric two-wheeled vehicles by 2025. Although it is desirable to manufacture a two-wheeled vehicle in the structure of an electric two-wheeled vehicle that does not generate emissions, the northern region of Thailand has a chronic power shortage problem despite the high electricity supply rate. Therefore, it is realistic to manufacture a two-wheeled vehicle with some structural changes. The existing two-wheeled vehicle is driven by a gasoline engine, but the structure of the modified vehicle is a method of applying a series hybrid drive system and using a motor while driving the vehicle. The motor uses the electrical energy of the battery, and when the capacity of the battery is reduced below a certain level, the engine is operated and the generator starts to charge the battery. There is an advantage in that emissions can be reduced because the engine operates in certain situations. In this paper, the energy efficiency data of the two-wheeled vehicle and the restructured two-wheeled vehicle, which is the main transport in Thailand, were constructed using MATLAB Simulink. In addition, a block diagram was constructed to estimate the fuel and power consumption of the two-wheeled vehicle that had been restructured compared to the existing two-wheeled vehicle in an amount of money.
계층 최대 R - 트리를 이용한 범위 상위 - k 질의의 효율적 수행
홍석진(Seokjin Hong),이상준(Sangjun Lee),이석호(Sukho Lee) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.1A
범위 상위-k 질의는 질의 범위 내의 다차원 데이타 중 값 애트리뷰트를 기준으로 상위 k개의 레코드를 반환하는 질의로 공간 데이타베이스와 데이타 웨어하우스에서 분석을 위해 많이 사용되는 유용한 질의 형태이다. 이 논문에서는 계층 최대 R-트리의 선택적인 탐색을 통해 범위 상위-k 질의를 효과적으로 수행하는 기법을 제시한다. 질의 결과를 포함하지 않는 단말 노드를 접근하지 않고 질의를 수행할 수 있기 때문에 적은 노드 접근으로도 질의 수행이 가능하며, 질의 범위의 크기에 관계없이 거의 일정한 성능을 보인다. 두 개의 우선순위 큐를 사용하며 질의 수행 공간을 최소화 하며, In Sorted Node 기법을 통해 기존 R-트리와 같은 팬아웃을 보장할 수 있다.
홍석진(Seokjin Hong),이석호(Sukho Lee) 한국정보과학회 2000 정보과학회논문지 : 데이타베이스 Vol.27 No.4
빙산 질의란 대용량의 데이타에 대해 집단 함수를 수행하여 특정 임계값 이상인 데이타를 결과로 반환하는 연산을 의미한다. 빙산 질의는 도메인의 크기가 대단히 큰 다차원, 대용량의 데이타에 대해 적용되므로 집단 함수의 수행을 위한 카운터를 전부 메모리에 적재할 수 없는 상황이 발생한다. 이 논문에서는 빙산 질의에 대한 저장뷰를 통해 효율적으로 빙산 질의를 수행하는 방법을 제시하였다. 빙산 질의의 임계값이 저장뷰 내에 포함되는 경우에는 즉각적으로 결과를 돌려줄 수 있으며, 그렇지 않은 경우에도 표본 추출 대신 저장뷰를 사용함으로써 빙산 질의 중간 단계의 후보 수를 크게 감소시키고, 질의 수행 시간 또한 단축시킬 수 있다. 또한 순위 빙산 질의를 수행하는 방법을 제시하여 사용자로 하여금 보다 직관적인 질의를 작성할 수 있도록 하였다. Iceberg query means such operation that computes aggregate functions over large data set and returns the results satisfying the specified threshold. Because iceberg queries are mainly applied to very large data set, the situation may occur that all counters for computing iceberg queries cannot be located in main memory. This paper proposes a method which computes iceberg queries efficiently by materialized views storing the results of aggregate queries above the specified threshold. If the threshold of an iceberg query is above that of the materialized view, the result can be returned immediately, and if not, no sampling process is needed by using the materialized view. So the number of candidates and running time can be reduced. It also proposes a technique for computing ranking iceberg queries, which helps users ask more intuitive queries.
전류 흐름 개선 플레이트를 적용한 리튬이온 배터리 성능 실험
홍석진(Seokjin Hong),한상현(Sanghyeon Han),태희동(Heedong Tae),최웅철(Woongchul Choi) 한국자동차공학회 2018 한국자동차공학회 학술대회 및 전시회 Vol.2018 No.11
To reduce emissions of exhaust gases known as the main cause of global warming, governments around the world are limiting the use of internal combustion engines and strengthening environmental regulations. Which lead to the research on eco-friendly automobiles to actively proceed. Among eco-friendly cars, electric vehicles, which use electricity as their main power source, are highly dependent on batteries. Therefore, the research on batteries is very important. Although the increase of supplement by the government subsidy policies from all around world, electric vehicles are difficult to operate over long distances because the mileage per charge is shorter than that of internal combustion engines. It also suffers from insufficient Charging Infrastructure and long charging times. The batteries of electric vehicle use electric energy to run electric motors and are highly dependent on batteries. It is important to ensure reliability of battery performance in order to ensure similar driving performance to the internal combustion engine. This paper aims to verify the feasibility of current improvement plate through Li-Ion Battery discharge experiment. The measured voltage data was collected during the Li-Ion Battery discharge experiment using LabVIEW of National Instrument.