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구자석,권순모,Yong-Suk Roh,Seok-Jin Lee,Ki-Young Jung,William N. Shafarman,박지현,김도훈,명재민,김우경 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.4
In this work, the selenization of Mo/CuGa/In/Se (Se layerthickness: 1 μm) precursors followed by sulfurization wasinvestigated. Particular emphasis was placed on the effect of thevariation of the selenization temperature and sulfurization timeon the morphology and compositional depth profiles of theresulting Cu(InGa)(SeS)2 (CIGSS) absorber; in addition, thecurrent-voltage characteristics of the corresponding devices wereinvestigated. The selenization of the precursors was achieved byusing a tube-type rapid thermal annealing system at varioustemperatures (500, 550, and 600 °C). Post-sulfurization ofCu(InGa)Se2 (CIGS) was performed in the same system byflowing H2S/He gas at 600 °C for different periods of time (5, 10,and 15 min). Post-sulfurization can improve the open-circuitvoltage of a solar cell by attracting Ga toward the surface regionof the light absorber and incorporating S into the absorber to yieldquinary CIGSS compounds. In addition, the voids at the Mo/CIGS interface, produced during the selenization of the CuGa/In/Se precursors, were effectively removed after post-sulfurization. Among the process conditions explored in this study, theselenization of Mo/CuGa/In/Se at 550 °C for 7 min followed bysulfurization at 600 °C for 10 min produced the device with thebest performance, providing also good material properties interms of morphology and compositional homogeneity
구자석,허남원,강신원 ( Ja Seok Koo,Nam Won Huh,Shin Won Kang ) 한국유화학회 1987 한국응용과학기술학회지 Vol.4 No.2
The addition of dipeptides and 1,2-bis (aminoacyl) hydrazine derivatives a level of 250 ppm to corn oil resulted in the retardation of the oxidaitive deterioration of the oil when it was stored in the oven at 70℃ during 5 days. Their antioxidant activities were investigated by UV absorbance of the corn oil at the wavelength of 234nm. 1,2-bis (aminoacyl) hydrazine derivatives showed higher antioxidant activity than normal dipeptides. Dipeptides containing phenyl ring with which is conjugable a-carbon radical showed antioxidant activity.
샤시모듈 내구해석을 위한 벨지안하중이력 데이터베이스의 설계
구자석(Jasuk Koo) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Belgian road load history database was designed according to the analytical design methodology. A relational database stores data in separate tables instead of placing all data in one large table. Therefore it has the advantage of minimizing the data redundancy and easy maintenance. First, user requirements were collected from work regulation, reports and end-user survey and entities, relationships, attributes for the ER model were defined. Through the normalization and denormalization, the ER model was optimized. The implemented database consists of 10 tables and enables to search load history file at the part joining points. The database can be used in standardizing the road load history data for various chassis type, vehicle weight and so on.
구자석(Jasuk Koo),박민수(Minsoo Park),이경민(Kyungmin Lee) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
Keyword network analysis is the process of investigating network structures in the keyword data using graph theory. In this study, keyword network analysis was conducted on 862 papers presented at the spring conference of the Korean Society of Mechanical Engineers for the past 5 years. Network associations between authors were analyzed using author information. And using the paper title, the frequency of the research keywords and the degree of correlation between the keywords were analyzed. Five large research groups were identified. There are groups where many students gather around a professor, and groups where researchers conduct joint research. Noun and adjective keywords were extracted through morpheme analysis, and the frequency of simultaneous occurrence of a keyword pair in one paper title was confirmed. Keywords were clustered according to network modularity, with the top 5 clusters accounting for 70% of the total data. Through the two-mode keyword network analysis between the researcher and the title keyword, each research field and research networking were confirmed. According to the proposed keyword network analysis procedure, it is possible to identify trends in various research fields from the titles of the paper, identify key researchers, and identify researcher networks.
자동차용 고장력강 DP590의 인장 및 저되풀이수 피로물성 평가
구자석(Ja-Suk Koo),최재석(Jae-Seock Choi),전태룡(Tae-Ryong Jeon),허용학(Yong-Hak Huh),이해무(Hae-Moo Lee) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_2
Tensile and low cycle fatigue properties of high strength steel DP590 used for automotive chassis parts are evaluated. Test specimens are made of DP590 plate after painting and baking process. Load cell calibration, extensometer calibration and specimen alignment are performed to enhance the accuracy and precision. In addition, the guiding apparatus is made in order to prevent buckling when compression loading is present. When DP590 replaces SAPH370, the fatigue life of the lower control arm increases by 2 or 3 times.