감(枾)을 利用한 잼의 製造硏究

박원기(Won-Ki Park),유영희(Yung-Hi Yoo),현중순(Jung-Soon Hyun) 한국식품영양과학회 1975 한국식품영양과학회지 Vol.4 No.1

Took an experiment of the jam manufacture with the raw material―the persimmons mellowed naturally and the persimmons which were got rid of astringency artificially―with many kinds of Korean persimmons.<br/> The results as follows :<br/> 1. Table 1. shows the analysis Table of the nutritional composition in the raw persimmon and Table 2. shows the gelation factor content in the persimmon.<br/> 2. Table 3. shows the mixture ratio of the manufacturing raw material of persimmon jam and shows the properties of the jam.<br/> 3. The color of the jam manufactured with made from the natural mellowed persimmons was persimmon color containing black spot or orange. But the jam manufactured with the persimmons which were got rid of astringency by ethanol changed from persimmon color to light purple during the storage.<br/> 4. The jam manufactured with the natural mellowed persimmons did not taste astringent but the jam manufactured with the persimmons which were got rid of astringency artificially tasted astringent.

사상재배치가 고장수목의 BDD 변환에 미치는 영향

조병호,현원기,이우준,김상암 한국도시철도학회 2019 한국도시철도학회논문집 Vol.7 No.2

이진결정도는 고장수목해석에서 기존의 부울대수를 이용한 방법의 잘 알려진 대체수단이다. 이진결정도의 규모는 변환과정에서 고장수목의 변수 순서에 영향을 받는다고 알려져 있다. 이진결정도의 규모가 작을수록 단절집합과 최소단절집합을 짧은 시간 내에 계산하기가 유리하기 때문에 작은 규모의 이진결정도가 선호된다. 고장로직의 변화 없이 게이트 아래의 사상들을 재배치하면 이진결정도의 구조와 규모를 변화시킬 수 있다. 주어진 고장수목에 대해 두 종류의 사상재배치를 정의하고 그 효과를 점검하였다. 좌사행 및 우사행 사상재비치를 정의하여 주어진 원래의 고장수목과 고장경로의 수를 비교하였다. 사상재배치가 이진결정도에 미치는 영향은 고장수목의 구조와 중복사상의 영향을 받는다. 어떤 고장수목의 경우는 좌사행 재배치일 경우가 이진결정도의 규모가 작고, 어떤 경우에는 우사행 재배치의 경우가 이진결정도의 규모가 작게 된다. 이런 계산 결과를 근거로 작은 이진결정도로 변환시키기 위해 고장수목의 사상재배치를 하는 것이 유리하다. BDD is a well-known alternative to the conventional Boolean logic method in fault tree analysis. It is known that the size of BDD is affected by variable orders of fault tree during BDD conversion procedure. As the smaller BDD size is better for the calculation of cut set and minimal cut set in short run time, the conversion for smaller BDD is preferred. The relocation of events under gates without any change of failure logic can affect the structure and size of BDD. For a given original fault tree, two kinds of event relocation are defined and the effect of event relocation is checked. The left and right skewed relocations are defined and for each case the numbers of failure path in BDD are compared with that of the original fault tree. The effect of event relocation on BDD size depends on the structure of fault tree and repeated events. In a certain fault tree, the left skewed relocation results in smaller BDD size and, in other cases, the right skewed relocation induces the smaller BDD size. Based on this result, it is better to change the fault tree structure before BDD conversion in order to get a smaller BDD size.

사고 선행자를 활용한 희귀사건 빈도추정을 위한 Bayesian Algorithm 구현

이우준,현원기,조병호,김상암 한국도시철도학회 2019 한국도시철도학회논문집 Vol.7 No.2

In general, Probabilistic Risk Assessment(PRA) is based on the Event Tree(ET) composed of several event sequences that can occur following the initiating event. While this technique has been applied and evolved for decades for the risk assessment in many industrial area, the estimation of rate event frequency is one of the important subjects that should be still under study. One reason is that the data for such events are relatively sparse. This study illustrates the method for Bayesian estimation for rare event frequency using the accident precursor data. This study also demonstrates the computational program that is implemented using Finite Element Method (FEM) and the validation results for the proposed probability distributions. 일반적으로 확률론적 위험도 평가(Probabilistic Risk Assessment, PRA)는 주어진 초기사건이 전개될 수 있는 모든 가능한 사건시컨스(Event Sequence)를 고려하여 모델링한 사건수목(Event Tree)를 기반으로 수행된다. 이러한 PRA 방법은 과거 수십 년간 여러 분야에서 위험도를 평가하기 위하여 적용되고 발전하여 왔으나 대형사고 등 희귀사건에 대한 발생빈도에 대한 추정은 여전히 연구해야 할 주제로 남아 있다. 이유 중의 하나는, 희귀사건 빈도추정은 관측 자료가 충분하지 않기 때문이다. 본 논문은 사고선행자를 활용한 베이지안 방법을 설명하고, 가정된 여러 확률 분포를 처리할 수 있는 베이지안 구현 프로그램을 기술한다. 베이지안 방법을 적용하기 위한 수치적분 방법이 필요한 이유와 각종 확률 분포를 적용할 수 있는 프로그램을 개발한 결과 및 연산결과에 대한 검증결과를 기술한다.

고장수목으로부터 변환된 BDD에서 효율적인 MCS 추출을 위한 BDD 재구성 방법과 새로운 근사확률 공식

조병호,현원기,이우준,김상암,Cho, Byeong Ho,Hyun, Wonki,Yi, Woojune,Kim, Sang Ahm 한국정보통신학회 2019 한국정보통신학회논문지 Vol.23 No.6

이진결정도는 고장수목 해석에서 기존의 Boolean Logic 해석법의 잘 알려진 대체 방법이다. 고장수목의 규모가 커짐에 따라 계산에 필요한 컴퓨터 연산시간과 자원이 급격하게 증가한다. 이진결정도로부터 단절집합 및 최소단절 집합을 효과적으로 계산하기 위해 새로운 고장경로 탐색법과 고장경로 재구성 방법이 제안되었다. 고장경로 그룹화와 Bottom-Up 탐색법은 고장경로의 탐색에 효율적임을 증명하였고, 최소단절집합 계산을 위한 단절집합의 비교계산 횟수를 줄이기 위해 경로 재구성 방법을 사용할 수 있음을 증명하였다. 새로 제안된 방법을 적용하고, 기존의 근사확률 공식인 MCUB 확률공식과 동일한 새로운 ASDMP 확률공식을 사용하여 정상사상 확률을 계산 할 수 있다. BDD is a well-known alternative to the conventional Boolean logic method in fault tree analysis. As the size of fault tree increases, the calculation time and computer resources for BDD dramatically increase. A new failure path search and path restructure method is proposed for efficient calculation of CS and MCS from BDD. Failure path grouping and bottom-up path search is proved to be efficient in failure path search in BDD and path restructure is also proved to be used in order to reduce the number of CS comparisons for MCS extraction. With these newly proposed methods, the top event probability can be calculated using the probability by ASDMP(Approximate Sum of Disjoint MCS Products), which is shown to be equivalent to the result by the conventional MCUB(Minimal Cut Upper Bound) probability.

피혁 제조 공정 중 발생하는 폐돈지를 이용한 음이온성 계면활성제 제조 및 특성

신수범(Soo-Beom Shin),민병욱(Byung-Wook Min),양승훈(Seung-Hun Yang),박민석(Min-Seok Park),원기천(Gi-Chun Won),백두현(Doo-Hyeon Paek) 한국염색가공학회 2006 韓國染色加工學會誌 Vol.18 No.6

소아 급성호흡곤란증후군에서 체외순환막장치 적용에 대한 RESP, PRESERVE, ECMOnet 점수 체계의 유용성

안원기 ( Won Kee Ahn ),한정호 ( Jung Ho Han ),김윤희 ( Yoon Hee Kim ),설인숙 ( In Suk Sol ),윤서희 ( Seo Hee Yoon ),김민정 ( Min Jung Kim ),김경원 ( Kyung Won Kim ),손명현 ( Myung Hyun Sohn ),김규언 ( Kyu-earn Kim ) 대한소아알레르기호흡기학회 2017 Allergy Asthma & Respiratory Disease Vol.5 No.3

Purpose: With increasing use of extracorporeal membrane oxygenation (ECMO) for acute respiratory distress syndrome (ARDS) in children, development of standardized strategies for survival prediction has become crucial; however, this has not been accomplished yet. We evaluated the adult scoring systems for survival prediction used for their applicability in pediatric ARDS and validated them. Methods: A total of 11 children with ARDS receiving ECMO from 2013 to 2014 were evaluated with adult scoring systems, including the Respiratory Extracorporeal-membrane-oxygenation Survival Prediction (RESP), the PRedicting dEath for SEvere ARDS on VV-ECMO (PRESERVE), and the ECMOnet scores. We compared the scores on these scales and the clinical characteristics between survivors and nonsurvivors. Results: Eight of the 11 children died (72.7%). The PRESERVE score (survivors vs. nonsurvivors: 2 vs 5.25, P=0.048), and the ECMOnet score (4.1 vs. 5.63, P=0.048) were lower in survivors than in nonsurvivors. They correctly predicted mortality prediction. There was no significant difference in the RESP score between survivors and non-survivors (-4.33 vs -2.62, P=0.63). The parameters that showed significant differences in this study were peak inspiratory pressure, platelet, and delta neutrophil index. All children who were under immunocompromised conditions, such as those with tumors, or underwent hematopoietic stem cell transplantation died. The immunocompromised status should be considered an important factor for survival prediction in children with ARDS. Conclusion: This is the first pilot study to apply the survival prediction scoring system to pediatric ARDS with ECMO. It is necessary to establish and modify the survival prediction score system for pediatric ARDS with ECMO. (Allergy Asthma Respir Dis 2017:5:141-146)

단일기관 증례 기반의 개두술 후 수술 부위 감염의 발생률과 미생 물학적 관점의 고찰

권유현(Yoohyun Kwon),노해원(Haewon Rho),조현준(Hyun Joon Jo),윤원기(Won Ki Yoon),김종현(Jong Hyun Kim),권택현(Taek Hyun Kwon),변준호(Joonho Byun) 대한두개저학회 2023 대한두개저학회지 Vol.18 No.2

Al-Mg-Si 합금의 초기 석출물이 비대칭 압연에 의한 전단변형에 미치는 영향 : 집합조직과 성형성

채원기,김봉규,이종범,한준현 대한금속·재료학회 2020 대한금속·재료학회지 Vol.58 No.10

Al-Mg-Si alloy was rolled asymmetrically at several temperatures to apply shear deformation, and the effects of the initial precipitate on shear deformation, texture evolution, formability, and plastic anisotropy were studied. Texture was analyzed using a EBSD, and the formability and plastic anisotropy of the specimen were evaluated using the value and value calculated from the plastic strain ratio (r-value) which was determined from the change in the length of the specimen during tensile deformation. Asymmetric rolling induces a larger equivalent strain than symmetric rolling, and the equivalent strain increases as the asymmetric rolling temperature increases. When a specimen with peak-aged initial precipitates was asymmetrically rolled, less shear deformation occurred at room temperature than in a solution-treated specimen without initial precipitates. In contrast, a larger shear deformation occurred at high temperatures (500°C). With asymmetric rolling at room temperature, the specimens without initial precipitates had higher formability and lower plasticity, while for asymmetric rolling at high temperature, the specimens with initial precipitates had higher formability and lower plastic anisotropy. This is due to the <111>//ND texture, such as {111}<110> and {111}<112> orientation that has similar and high r-values at 0°, 45°, and 90° to the rolling direction, developed by the shear deformation that occurred during asymmetric rolling.

유한요소법을 이용한 분할판 개념하의 평판 좌굴해석

민철기,손원기,주재현,류시융 한국전산구조공학회 1995 한국전산구조공학회논문집 Vol.8 No.3

본 논문에서는 평판 두께 방향의 선형 및 비선형 응력 분포를 일정한 크기의 단순응력 상태로 가정하는 분할판(Two-element plate) 개념을 이용하여 비선형 특성을 나타내는 평판의 강도해석을 할 수 있는 Reissner 범함수와, 재질 특성은 선형이면서 기하학적 비선형 특성만을 갖는 평판의 강도해석을 할 수 있는 변형 Reissner 범함수를 모델링하였다. 두 종류의 Reissner 범함수들을 근거로 하여 축방향 하중을 받는 평판의 선형 좌굴과 좌굴후의 비선형 특성 및 최대강도들을 계산할 수 있는 유한요소 방정식과 프로그램 개발을 시도하였다. 개발한 프로그램을 이용한 수치해석 결과, 분할판 이론을 사용한 선형좌굴해석 결과가 기존의 평판이론을 사용한 선형좌굴해석 결과와 유사항 경향을 나타냄으로써 분할판 이론에 근거한 유한요소법을 하중과 경계조건 및 구성재질이 다양한 일반적인 평판의 강도해석에 확대 적용함은 물론 좌굴후 비선형재질 특성으로 인한 평판의 최대강도도 예측 가능하다고 생각한다. Two-element plate concept is incorporated into the buckling problem in order to simplify the nonlinear distribution of stress through the thickness of plate. Finite element formulations and programs based upon the Reissner functional and the modified Reissner functional using two-element plate concept are developed for buckling analysis of plates under axial compression. The two programs have been applied to obtain the linear elastic buckling behavior of axially compressed flat plates. Excellent agreement of linear elastic-solution results with exact or approximate solutions of other authors for the same boundary conditions proves the validity of the finite element method using two-element plate theory.

적외선 우주배경복사 관측 실험 2(CIBER2) 국제 공동 연구

이대희,박원기,문봉곤,박성준,김민규,김건희,남욱원,표정현,정웅섭,박영식,김일중,한원용,Lee, D.H.,Park, W.K.,Moon, B.G.,Park, S.J.,Kim, M.G.,Kim, G.H.,Nam, U.W.,Pyo, J.,Jeong, W.S.,Park, Y.S.,Kim, I.J.,Han, W. 한국천문학회 2015 天文學論叢 Vol.30 No.1

First light galaxies have predictable linear clustering, and are expected to produce fluctuations with a characteristic spatial power spectrum, which peaks at an angular scale of ~ 10 arcminutes and in the $1-2{\mu}m$ spectral regions. The Cosmic Infrared Background ExpeRiment 2 (CIBER2) is a dedicated sounding rocket mission for measuring the fluctuations in the extragalactic infrared background light, following up the previous successful measurements of CIBER1. With a 28.5 cm telescope accompanied with three arms of camera barrels and a dual broadband filter on each H2RG (${\lambda}_c=2.5{\mu}m$) array, CIBER2 can measure 6 bands of wide field ($1.1{\times}2.2$ degrees) up to 3 AB magnitudes deeper than CIBER1. This project is leaded by California Institute of Technology/Jet Propulsion Laboratory, collaborating internationally with Institute of Space and Astronautical Science in Japan, Korea Astronomy and Space Science Institute, Korea Basic Science Institute, and Seoul National University. The Korean team is in charge of 1) one H2RG scientific array, 2) ground station hardware and software, 3) telescope lenses, and 4) flight and test bed electronics fabrication. In this paper, we describe the detailed activities of the Korean participation as well as the current status of the CIBER2 project.