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[論文] 應答表面法에 의한 切斷바이트의 工具壽命式에 關한 硏究
김원일(W.I.Kim),이윤경(Y.K.Lee),남준우(J.W.Nam),송지복(J.B.Song),최만성(M.S.Choi) 한국자동차공학회 1988 오토저널 Vol.10 No.2
This paper presents a study of tool-life equation on cut-off test by the statistical approach, refered to as response surface methodology instead of a conventional one-variable at a time method.It is the merit of response surface methodology that the test time is reduced to minimize the size and accurate analysis can be done.The reliability of such an equation can also be estimated.Two independent variables, cutting speed and feed rate, were investigated.A first order modeling equation is presented in this project.<br/> The results of this study are as follows that tool-life in cut-off operation is affected by cutting speed more than feed, and first order tool-life predicting equations are in good agreeement with experimental results.
김원상(W.S. Kim),김영신(Y.S. Kim),김정중(J.J. Kim),강윤종(Y.J. Kang),정우창(W.C. Jung),정병창(B.C. Jeong),홍정기(J.K. Hong),서인영(I.Y. Suh) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.7
본 논문은 2㎿급 풍력시스템의 이중여자유도형 발전기(DFIG)를 제어하기 위한 PCS의 전력변환장치와 주변장치 및 제어기술에 대해서 기술한다. 최근 국내 뿐만 아니라 해외 전력회사에서는 계통전원 사고 시 풍력시스템이 계통연계를 유지하면서 계통의 전력품질에 기여할 수 있는 기능(FRT)을 요구하고 있다. FRT기능 구현을 위한 H/W와 제어 시퀀스를 소개한다.
김진석(J.S.Kim),김원(W.Kim),정용호(Y.H.Chung),정순배(S.B.Chung),김영덕(Y.D.Kim),김현수(H.S.Kim) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_1
Power flow characteristics of a hydro-mechanical transmission system(HMT) were investigated for tracked vehicle. in steering. A HMT consisting of two hydrostatic pumpㆍ motors(HST), several planetary gear trains and steer differential gear was considered. In order to obtain the direction and magnitude of the power flow of the HMT, network theory for the general power transmission was used. Network model for the HMT in steering was developed, which consisted of shafts, nodes and transmission elements such as clutch, gear, etc. Power flow analysis procedure consists of two stages: (1) traction force analysis in steering, (2) power flow analysis in HMT. Torque and Speed of every transmission element of the HMT was determined from network analysis. Also, efficiency, mechanical and hydraulic power loss including HST, were obtained. In addition, the regenerative power flow resulting from steering can be studied in graphic display. The power flow analysis program(PCSTEER) developed in this work can be used as a useful design tool for the tracked vehicle with HMT.<br/>
[論文] 切削中인 工具의 傾斜面上에 Crack 을 갖는 경우의 應力解析에 관한 硏究
김원일(W.I.Kim),남준우(J.W.Nam) 한국자동차공학회 1987 오토저널 Vol.9 No.3
The determination of stress distributions on the rake face of tool are important to understand the mechanism of metal cutting. For this reason, many researchers have been payed much effort to analyize machining stress distribution on the rake face.<br/> The author's photoelastic experiment has shown that the stress distributions on a rake face can be obtained photoelastically by using a specially designed tool made of epoxy resin plate, and also, Stress Intensity Factors K_I, KII and Crack Extension Angle can be determined by using Linear Elastic Fracture Mechanics.<br/>
Hermite 곡선을 이용한 자동차 엔진 캠 형상의 최적 설계에 관한 연구
김도중(D.J.Kim),김원현(W.H.Kim) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
A numerical method is proposed to optimize automotive cam profiles. An acceleration curve of a cam follower motion is described by Hermite curves. Because of the intrinsic characteristics of the Hermite curve, it is possible to design an acceleration curve with arbitrary shape. Design variables in the optimization problem are locations of control points which define the acceleration curve. Objective function includes dynamic performances as well as kinematic properties of a valve train. Similar optimization procedure was also tried using Polydyne cam profile synthesis method. Optimized profile using Hermite curve are proved to be superior to that using Polydyne method.<br/>
반추가축영양 : Canola Seed 의 가공방법에 따른 반추위 영양소 분해율 및 발효특성 평가에 관한 연구
김원(W . Kim),김현진(H . J . Kim),이성훈(S . H . Lee),장문백(M . B . Chang),맹원재(W . J . Maeng) 한국축산학회 2001 한국축산학회지 Vol.43 No.6
This experiment was carried out to evaluate the nutritive values of full-fat canola seed by physical processings such as micronized, ground, hand crushed and extruded by determining the change of fatty acid, amino acid profile, and ruminal fermentation in lactating dairy cows. The objectives of this experiments were conducted to find out the optimum processing methods and feeding level of full-fat canola seed to improve the lactation performances in dairy cows. This experiment consists of two trials by step of continuing concepts. In 1st experiment, effect of the various processing methods (micronized, ground, hand crushed and extruded) of canola seed on modification of nutrient composition, and nutrient availability in the rumen by using in situ dacron bag technique was determined. The effect on the ruminal fermentation characteristics in vitro was investigated in experiment 2 in which 10% of canola seed processed by the micronized, ground and extruded, respectively. The results of the two trials are as follows. In the 1st experiment, DM content was reduced but ether extract and protein contents were not changed by methods of processing a full-fat canola seed except for ether extract of extruded canola seed. The micronized and extruded processings increased in the 18:3 fatty acid content but were not changed in total and essential amino acids contents. The micronized and ground full-fat canola seed were highest among the other processing methods (P<0.001). Ground processing regardless of heat treatment increased the disappearances of DM and protein compared to hand crushed (P<0.01). The extruded processing showed that nutrient disappearance was higher before 9 hours incubation (P<0.01) but was lower compared with the micronized and ground (P<0.001). Higher wash out value was observed in the micronized and ground full-fat canola seed compared to simply ground except for extruded. However, in the fraction “b” for protein, the micronized was lowered than that of ground. The undegradable intake protein content of full-fat canola seed among processing methods except for whole form of full-fat canola seed was highest for extruded and moderate for hand crushed or ground, and lowest for the micronized ground. Essential amino acids disappearance in the rumen was increased by the ground (p<0.01) but the extrusion resulted in decreased disappearance. Biohydrogenation of processed full-fat canola seed in the rumen was observed and particularly, 18:03 fatty acids were converted into 18:01, 18:0 or 16:0 fatty acids. In the micronized or extruded, 18:3 or 18:02 fatty acid was increased but decreased with grinding including whole ground, hand crushed, micronized ground or extruded after incubation. In the 2nd experiment, there were no significant differences in ruminal pH among control and processed full-fat canola seed such as the micronized, extruded and ground. Ruminal NH_3-N concentration was not significantly different between control and processing full-fat canola seed but showed that there was partially significant difference by processing effect (P<0.05). Acetic acid production was affected by mainly utilization or processing methods of full-fat canola seed (P<0.05). The ground full-fat canola seed was decreased propionic acid production compared to the others, and the highest production was observed in the extruded canola seed (P<0.05). The concentration of iso-butyric acid and iso-valeric acid were increased by full-fat canola seed utilization and these for extruded and ground processing were significantly higher than those for control and the micronized (P<0.01). From these trials, protein and energy utilization of full-fat canola seed in the rumen was changed by physical processiongs, and considered that heat processing of them may increase the lactational productivity of dairy cattle.