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김진우,문기원,주정진,J.W. Kim,K.W. Moon,J.J. Ju 한국전자통신연구원 2023 전자통신동향분석 Vol.38 No.1
In the rapidly growing field of quantum computing, it is evident that a robust supply chain is needed for commercialization or large-scale production of quantum chips. As a result, the success of many R&D projects worldwide relies on the development of quantum chip foundries. In this paper, a variety of quantum chip foundries, particularly the ones creating photonic integrated circuit (PIC) quantum chips, are reviewed and summarized to demonstrate current technological trends. Global projects aiming to establish new foundries, as well as information regarding their respective funding, are also included to identify the evolutionary direction of quantum computing infrastructure. Furthermore, the potential application of lithium niobate as a novel material platform for quantum chips is also discussed.
너트 프로젝션용접 품질 모니터링을 위한 전문가 시스템의 개발
김진우(J.W. Kim),임성룡(S.R. Lim),박찬우(C.W. Park),이광원(K.W. Lee),조상명(S.M. Cho) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.4
It has been very significant for car manufacturers to develop the quality assurance technology because of the application of PL(Product Liability). In the present study, during the nut resistance projection welding the current and voltage signal could be monitored to evaluate the welding quality. At the same time, dynamic resistance pattern could be obtained by the application of Ohm's law. Appling the dynamic resistance slopes to be defined as the differencial of the dynamic resistance by the proper time, process unstable factors such as initial contact, initial heat input and force followability could be evaluated. And the square sum of welding voltage and the end resistance could be used to evaluate total heat input and nugget growth. By setting up the algorithm to evaluate the various unstable conditions, the Expert System could be developed for the quality monitoring of the nut projection welding(M8)
분말 압출 공정에서 온도 유지시간 제어를 통한 미세기어의 내피로성 향상 연구
김진우(J. W. Kim),이경훈(K. H. Lee),황대원(D. W. Hwang),김병민(B. M. Kim) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
This paper was designed to fabricate the miniature spur gear with pitch circle of 1.8 by hot extrusion process of mechanically alloyed Zn-22wt%Al powder at various temperature. The mechanical alloying was performed for ball milled times of 8h, 16h and 32h by the planetary ball milling. Mechanically alloyed powders were compacted cylindrical performs. Extrusions of the miniature spur gear using the alloyed powder were carried out at different extrusion temperatures. The extruded spur gear was sintered for 2h at 350℃ in argon atmosphere. The friction between the die and the powdered billet and the internally different density due to complex product shape cause the internal crack. To overcome the mentioned problems, high dimensional accuracy at cross section of the spur gear and uniform Vickers hardness could be obtained by graphite lubricant and controlling holding time.
김진우(J.W.Kim) 한국자동차공학회 1991 오토저널 Vol.13 No.4
The off-road tractive performance of tracked vehicles can be evaluated in terms of soil thrust, motion resistance and drawbar pull. The ability to predict accurately ground pressure distribution under track is of importance since the vehicle sinkage and motion resistance are closely related to it. While the formulation of the method for predicting ground pressure distribution follows closely in spirit the ideas outlined for the terrain with linear pressure-sinkage relation case by Garber and Wong, the analysis of various terrain stiffness is magnified by numerical implementation procedure. The effects of soil parameters on tractive forces can be introduced through the terrain-track interaction such as pressure-sinkage and shearing characteristics. It is illustrated by determining the drawbar pull-slip relation and corresponding ground pressure distribution for the terrains typically chosen and by comparing the results with the conventional ones based on nominal ground pressure. The factorial experiment method is finally adopted for checking the sensitivity of the values of soil parameters on the drawbar pull.