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김길주,안창호,황강진 융복합지식학회 2019 융복합지식학회논문지 Vol.7 No.4
버뮤다 옵션의 가격을 계산하기 위한, 좀더 엄밀하게 말하면 시장가격에 가장 근사하다고 의견의 일치를 보는 방법은 아직 없다. 버뮤다옵션의 가격결정은 동적 프로그래밍 원칙을 해결하는 것과 같으며, 특히 큰 차원에 있어서 주된 어려움은 지속 가치와 관련된 조건부 기대치들의 계산에서 비롯된다. 이러한 조건부 기대치들은 유한 차원 벡터 공간상에서 전형적인 회귀 기법에 의해 계산된다. 본 연구에서는 조건부 기대치들의 신경망근사치를 연구한다. 또한 표준 최소자승회귀분석을 신경망 근사치로 대체함으로써 잘 알려진Longstaff-Schwartz 알고리듬과 합치됨을 보인다. There is no consensus on Bermuda option pricing, more precisely, the closest approximation to market prices. The pricing of Bermuda options is like solving dynamic programming principles, and the main difficulty, especially on a larger scale, comes from the calculation of conditional expectations related to continuation value. These conditional expectations are computed by a typical regression technique on finite dimensional vector spaces. In this study, we study the neural network approximation of conditional expectations. It is also shown that it replaces the standard least squares regression with a neural network approximation, which is consistent with the well-known Longstaff-Schwartz algorithm.
전산기에 의한 Ready-Mixed Concrete의 품질관리를 위한 배합계산법
김길주,Kim, Gil-Ju 한국레미콘공업협회 1986 레미콘 Vol.3 No.-
본고는 일본「Concrete공학 」(Vol.20,No.10. Oct 1982)에 발표된 아부도산, 후등화이, 최도홍의 "전산기에 의한 레미콘의 품질관리를 위한 배합계산법"를 토대로 하여, 건설재료연구회의 "레미콘의 제조와 품질관리"를 참고로 한 것이다.
이동춘,장규표,김길주 東亞大學校 1996 東亞論叢 Vol.33 No.-
Grip strength is a very important basic data for ergonomic design of hand tools, grips, handles and etc.. If excessive grip strength is continuously exerted to handle various machines or tools, it may be cause a musculoskeletal disorder such as a cumulative trauma disorders. For example, carpal tunnel syndrome is a typical nerve disorder among CTDs. In this paper, we have measured the grip strength under sitting and standing posture for Korean adults ; 114 male and 105 female aged from 20' to the above 50'. Subsequently, this paper performed statistical analysis for driving out characteristics of grip strength according to the elbow posture. And compared to the previous foreign research of Mathiowetz(American) and Chatterjee (Indian) The results are as follows ' (1) The maximum grip strength is exerted under standing posture at elbow in full extension 180°for both male and female. (2) The minimum grip strength is exerted with mostly elbow 90°in both of male and female. (3) The grip strength under standing is stronger than sitting (4) There is a significant difference among posture, sex and right and/on left hand (5) Grip strength decreases with age for male, but we can't find any tendency for female. The results including data of this paper would be applied to design equipments. And it is expected to reduce the risk of injury, increase productivity, and well -being of the workers.
김길주(Kilju Kim),한철희(Cheolheui Han),전문수(Mun soo Chon),정수진(Soo Jin Jeong),박상훈(Sanghoon Park) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Heat transfer of cylinders in the forced convection problem has been an issue for the design of efficient and high performance heat exchangers. In this paper, heat transfer characteristics of two identical cylinders with various cross section shapes are investigated using a commercial software, CFD-ACE+. A cylinder with a circular cross section shape is selected as a base model. The cylinders with elliptical and square cross sections are also selected in order to compare the heat transfer performance between various types of cylinders. In the present paper, the heat transfer characteristics of those cylinders will be discussed focusing on the interference effects and flow characteristics.
김길주,이승무,이수구 연세대학교 산업기술연구소 1983 논문집 Vol.15 No.2
This investigation was carried out to study the binding of waste sludge with cement binders. According to the change of moisture content of sludge and mixing ratio in the portland cement, special alumina cement and combination of portland cement and sodium silicate as the binder, the unconfined compressive strength and outflow of the toxic materials from the compressed sludge were measured and analyzed. In the condition of the same mixing ratio and moisture content, the unconfined compressive strength was decreased in the order of the use of special alumina cement, portlant cement + sodium silicate(10%), portlant cement + sodium silicate(5%), and portland Cement. To obtain the unconfined compressive strength above 10kg/㎠ in 70% moisture content and 7 days of curing time, the mixing ratio(C/S) must be above 0.2 and 0.3 for special alumina cement and combination of portland cement and sodium silicate(10%), respectively. In order to prevent the outflow of toxic materials from the compressed sludge, the mixing ratio and unconfined compressive strength must be over 0.5 and 6.5kg/㎠ for portland cement, 0.2 and 5.2kg/㎠ for special alumina cement, 0.25 and 4.1kg/㎠ for combination of portland cement and sodium silicate in 86% of moisture content, respectively.