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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.
구자석(Jasuk Koo) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Vibration fatigue analysis which is established by Dirlik at 1985, is widely used to developing automotive components or parts. For the vibration fatigue analysis, normal mode analysis and frequency response analysis precedes in order to obtain the system transfer function. The frequency request method in the frequency response analysis is very important factor to affect to the fatigue life of the components. In this study, we proposed the most effective frequency request method, which is requiring small number of frequency points, producing less output file size and giving reasonable results. For this study, we made a primitive analysis model and compared 18 frequency request methods to find out the best model. As a result, proposed method reduces output file size as 1/20 and gives 0.69 times of fatigue life compare to 1 Hz equally spaced frequency request method. This method could be utilized for the large sized models like as lamp system or automotive battery system, etc.
구자석(Jasuk Koo),최재석(Jaeseock Choi),전태룡(Taeryong Jeon) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_3
Vibration fatigue analysis of TPMS housing and antenna is performed in the frequency domain. It is well known that TPMS (Tire Pressure Measurement System) is a very important part in vehicle safety. In this study. we procedure mode analysis. modal frequency response analysis and vibration fatigue analysis. As a result, the TPMS housing and antenna is safe in the vibration environment, and the critical location is the curved position in the antenna.
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.
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.