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파라메트릭 모델에 의한 주강의 수축공 결함 예측의 Quality Criteria
이재경,최정길,홍준표 ( Jae Kyung Lee,Jeong Kil Choi,Chun Pyo Hong ) 한국주조공학회 1998 한국주조공학회지 Vol.18 No.1
N/A Criteria functions using the prediction parameters, such as t_f, G and G/√R which can be evaluated from the heat transfer and solidification analyses of castings, are of great importance in the prediction of shrinkage defects in steel castings. The critical values of these prediction parameters are found to be dependent upon the shape and size of castings. A new additional parameter, shrinkage potential, was proposed to evaluate the formation of shrinkage defects quantitatively. A coupling method of the prediction parameters with shrinkage potential was adopted to predict shrinkage defects in steel castings. The calculated results on several castings were compared with the experimental castings. (Received January 14, 1998)
중세철학의 연구 동향과 토미즘의 미래 - 이재룡 신부의 물음 되새기기 -
이재경 ( Lee Jaekyung ),정현석 ( Chung Hyun Sok ) 한국중세철학회 2023 중세철학 Vol.- No.29
이 글은 “21세기를 맞아 토미즘의 과제는 무엇일까?”라는 이재룡 신부의 물음을 되새기고자 한다. 19세기 말 교황 레오 13세가 회칙 「영원하신 아버지」를 반포한 이후 토미즘은 물론 중세철학 연구도 획기적인 발전을 이루어 냈지만, 최근 들어 토마스 중심적인 연구 경향 탓에 중세철학 연구의 불균형 현상이 생길 뿐만 아니라 토미즘도 고립을 자초한다는 비판이 제기되기도 한다. 우리는 이런 비판에 귀 기울이면서 토미즘의 미래를 위한 과제를 알아보고자 한다. 이를 위해 비판의 대상인 중세철학의 표준적 해석들에 대해 살펴보고 중세철학과 토마스 또는 토미즘의 대안적 해석이나 연구 방법을 모색하고자 한다. This paper aims to reflect on Fr. Jae-Ryong Lee’s question, “What are the challenges of Thomism in the 21st century?” Since Pope Leo XIII promulgated the encyclical ‘Aeterni Patris’ at the end of the 19th century, the study of medieval philosophy as well as Thomism have made great strides, but there have recently been criticisms that Aquinas-centered research has not only led to an imbalance in the study of medieval philosophy but also to the isolation of Thomism. We wish to respond to these criticisms and explore the challenges for the future of Thomism. To this end, we will examine the standard interpretations of medieval philosophy that have been criticized and find out alternative interpretations and methods of studying medieval philosophy and Aquinas or Thomism.
이재경,지동해,창병모,Lee, J.K.,Chi, D.,Chang, B.-M. 한국전자통신연구원 1994 전자통신동향분석 Vol.9 No.4
Wide variety of the architectural complexity of parallel computer often makes it difficult to develop efficient programs for them. One of approaches to improve this difficulty is to program in familiar sequential languages such as Fortran or C and to parallelize sequential programs into equivalent parallel programs automatically. This paper presents an organization of parallelizing compiler which transforms sequential programs into equivalent parallel programs. The parallelizer consists mainly of syntax analysis, control and data flow analysis, program transformation, and parallel code generation. In particular, the program restructuring in this parallelizer maximizes loop parallelism.
FDM 에 의한 응고해석시 계산기간 단축을 위한 Algorithm 연구
이재경,전주매,전기찬 ( Jae Kyung Lee,Ju Mae Jeon,Ghi Chan Jun ) 한국주조공학회 1994 한국주조공학회지 Vol.14 No.5
N/A Efficient algorithm for the solidification simulation by FDM is described from the practical point of views. If a proper time step Δt is selected, the calculation is accelerated by implicit algorithm with the temperature recovery method of latent heat method. The implicit routine in the calculation is processed by SOR method(relaxation factor=1.5, truncation error=l0^(-4)). The calculation is more accelerated by linear-interpolated explicite algorithm with a time step larger than the minimum value of the time step. This explicit method, which is applicable to the practical casting simulation problems, produces almost same results with about 40% faster calculation speed compared with the conventional explicit method.
주형하강식 일방향 응고시 결정성장에 미치는 Grain Selector 의 영향
이재경,최학규,홍준표 ( Jae Kyung Lee,Hack Kyu Choi,Chun Pyo Hong ) 한국주조공학회 1989 한국주조공학회지 Vol.9 No.2
N/A This study was carried out on single crystal growth in the mold-withdrawal type unidirectional solidification. The effects of grain selectors on the microstructural morphology were investigated. A two-dimensional heat transfer model was developed to simulate the relationship between thermal parameters and growth morphology. Single crystal can be grown by proper design of grain selector in this method.