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김달식,김길수,김영직 ( Dal Sik Kim,Kil Soo Kim,Young Jig Kim ) 한국주조공학회 1996 한국주조공학회지 Vol.16 No.3
N/A The purpose of this study was to investigate semi-liquid forming process as it was applied to magnesium alloys and to characterize the effects of processing variables on forming process. Magnesium billet was produced by a grain refining method. The possibility of the semi-liquid method for producing the slurry with thixotropic property was considered. This was followed by heating process for the desired fine globular microstructure and the process for subsquently shaping the semi-liquid slurry. The mold filling behavior was investigated at various processing variables including injection velocity, injection pressure, and material temperature(liquid fraction of Mg alloy). The tensile property of the specimen was measured at the constant semi-liquid forming condition(injection velocity : 0.5m/s, injection pressure : 135㎏/㎠, liquid fraction : 0.6). Liquation initiated from the solute segregation parts and the shape of solid particles turned into spheres without stirring. It was observed that the mold filling behavior was improved as the injection velocity and the injection pressure increased. Unexpectedly, the tensile property of the specimen was measured a little lower than that of diecasting.
김달식 한국도서관·정보학회 2005 한국도서관정보학회지 Vol.36 No.2
This study examines current state of digital reference service on the homepage of university library in Korea. Among 236 university libraries, only 36.9%(87) provide digital reference services. Digital reference services was weak as face-to-face reference services in Korea. Based on the research finding, revealed current state and related problems, and a few suggestions are provided for digital reference service system. 본 연구에서는 국내 4년제 대학 도서관 중 접속 가능한 236곳의 도서관 홈페이지 분석을 통하여 디지털참고봉사의 제공 및 접근성과 이용 실태에 대해 조사하였다. 진정한 의미의 디지털 참고봉사 즉, 참고질의 응답을 제공하는 대학도서관은 236개 대학 도서관 중 36.9%인 87개 기관으로 우리나라에서 전통적인 참고봉사의 부진이 디지털 환경에서도 나타나는 것으로 파악되었다. 디지털 참고봉사를 적극적으로 활용한다면 전통적인 참고봉사의 부진을 씻고 참고 봉사의 새로운 전환점이 될 수 있을 것으로 판단되며, 분석결과를 바탕으로 현 디지털 참고봉사 시스템의 현황과 문제점을 파악하고 그 발전방향을 제언하였다.
김달식 한국사립대학교 도서관협의회 2005 사대도협회지 Vol.6 No.-
본 연구에서는 국내 4년제 대학 도서관 258곳의 도서관 홈페이지 분석을 통하여 디지털참고봉사의 제공 및 접근성과 이용 현황을 조사하였다. 디지털 참고봉사 즉 참고질의 응답을 제공하는 대학도서관은 258개 대학 도서관중 36.9%인 87개 기관으로 우리나라의 전통적인 참고봉사의 부진이 디지털 환경에서도 나타나는 것으로 파악되었다. 디지털 참고봉사를 효율적으로 활용한다면 전통적인 참고봉사의 부진을 씻고 우리나라 참고 봉사의 새로운 전환점이 될 수 있을 것으로 판단되며 발전방향을 제언하였다. To understand current state of the digital reference services in korean university libraries. a comprehensive examination and analysis was performed. Among 258 university libraries, only 36.9%(87) provide digital reference inquiry services. However, the use of digital reference inquiry was weak. One university library received on average 5.6 questions per month. Among the 1,605 questions received onthe digital reference system, only 23.2%(372) were regarded as real reference questions. Results revealed interesting findings and related problems. Suggestions for future development are provided.
Hybrid modeling을 이용한 Road noise 분석에 관한 연구
김달식(Dalsik Kim),박광서(Kwangseo Park),김영호(Yongho Kim),김인동(Indong Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper describes a method to analyze road noise analysis through using hybrid modeling. Hybrid modeling means combining test and math data. TPA method is used to predict interior road noise and matrix inversion method is used to estimate operational forces. In this paper three TPA models are used. In first model, operational vibration data is based on test data from chassis dynamometer. In second model, operational vibration data is based on analysis data and third model is based on FBS method. And the others trimmed body FRF data are commonly used. In FBS case, rear suspension FRF data is acquired from FRF synthesis. From this study the global influence of substructure modification can be easily assessed by reformulating subcomponent FRF data. And besides finite element analysis can be used to rapidly define the frequency characteristics of subcomponent.