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복합실린더에서 유전알고리즘을 이용한 역열전달 문제의 해
김창원(Kim C.W.),이영신(Lee Y.S.),강선예(Kang S.Y.),박홍선(Park H.S.),윤기석(Yoon. K.S.) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
In this paper, the genetic algorithm is used in order to solve the inverse heat conduction problem and estimation of the time-dependent heat source, using temperature histories at a point in a two layer system. It is shown that the physical heat transfer problem can be formulated as an optimization problem with differential equation constraints. The algorithm provides a global optimum instead of a local optimum of the inverse heat transfer problem. Some numerical results are presented to demonstrate the accuracy and efficiency of the method.
데이터 배선 용량 최소화를 위한 비정질 실리콘 박막 트렌지스터 배열의 최적화 설계와 구현
김창원,윤정기,김선용,김종효,Kim, C.W.,Yoon, J.K.,Kim, S.Y.,Kim, J.H. 대한의용생체공학회 2008 의공학회지 Vol.29 No.5
Thin-film transistor (TFT) arrays for an x-ray detector require quite different design concept from that of the conventional active-matrix liquid crystal devices (AM-LCDs). In this paper anew design of TFT array which uses only SiNx for passivation layer is described to meet the detector performance and the product availability simultaneously. For the purpose of optimizing the design parameters of the TFT array, a Spice simulation was performed. As a result, some parameters, such as the TFT width, the data line capacitance, and the storage capacitance, were able to be fixed. The other parameters were decided within a permissible range of the TFT process especially the photolithography process and the wet etch process. Then we adapted the TFT array which had been produced by the proposed design to our prototype model (FDXD-1417 and evaluated it clinically by comparing with a commercial model (EPEX, Hologic, Beford, USA). The results say that our prototype model is slightly better than EPEX system in chest PA images. So we can prove the technical usefulness and the commercial values of the proposed TFT design.