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김홍욱(H.W.Kim),박신희(S.H.Park),강신유(S.Y.Kang),한동철(D.C.Han),김정원(J.W.Kim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
In substitution of beam-nonlinear spring model for real-car, it may have errors due to complicated characteristics of joint and overestimation of joints stiffness. In this research, a method for the joint modeling was suggested by nonlinear static and dynamic analyses of beam and shell joint models and verified by the application of accomplished joint modeling method to fullcar beam-nonlinear spring model. In consequence, modified beam-nonlinear spring model was improved in local acceleration and rigid wall force.<br/>
정동수(D. S. Jung),이용범(Y. B. Lee),김홍욱(H. W. Kim),이종직(J. J. Lee) 유공압건설기계학회 2022 유공압건설기계학회 학술대회논문집 Vol.2022 No.12
The electronically controlled main pump applied to the excavator is an important part that supplies hydraulic power to the excavator, and high reliability is required to enhance the reliability of mechanical equipment. Reliability is proven through test evaluation on test equipment reflecting the working environment because it maintains the performance and function of the product without failure occurring at the work site during the warranty life required by the mechanical equipment. Reliability evaluation consists of test items that affect performance degradation and loss of function, and is largely classifies into performance tests, life tests, and environment tests.
옥수수 알곡의 가공처리에 의한 영양소 이용성 향상에 관한 연구 II. 한우에 있어서 옥수수 알곡의 가공처리가 반추위 미생물의 부착양상에 미치는 영향
김완영,김홍욱,강충민,Kim, W.Y.,Kim, H.W.,Kang, C.M. 국립한국농수산대학교 교육개발센터 2001 현장농업연구지 = Journal of practical agricultural resear Vol.3 No.1
This study was conducted to determine effects of whole and processed corns on attachment characteristics of rumen microbes in Hanwoo. Whole corn(WC) was processed into four different types; ground corn(GC), cracked corn(CC), flaked corn(FC), and soaked corn(SC). After each processed corns was incubated in the rumen of Hanwoo for 12 h and 24 h, attachment characteristics of rumen microbes and morphological changes of feed substrates was examined by utilizing scanning electron microscopy(SEM). In this study, the treatment group of GC and CC showed the highest in the attachment of rumen microbes. On the other hand, microbial attachments to the starch particle of WC and SC were hardly detected. However, with the increase of incubation time the surface of WC and SC was covered by many microbes, resulting in enhancing the surface degradation.
반추가축에 있어서 옥수수 알곡의 가공이 영양소 이용에 미치는 영향에 관한 고찰
김완영,김홍욱,이기종,Kim, W.Y.,Kim, H.W.,Lee, K.J. 국립한국농수산대학교 교육개발센터 2001 현장농업연구지 = Journal of practical agricultural resear Vol.3 No.1
Through out the last few decades, processing methods for ingredients of feed grains, such as grinding, flaking, extrusion, soaking, cracking etc., have been adopted in order to improve the nutrient digestibility in ruminants. Among feed grains, processing methods for whole corns have been the most frequently studied since corns are utilized as the thumb ingredients in formulating feeds. In these days, flaking of whole corns is the most incessantly used in formulation feeds, resulting in enhancing the performance of ruminants. Recently formulating non-forage feed for beef cattle, especially Holsteins, without processing whole corns is carrying out through various feed companies with expectations of whole corns acting like forages. However, it can not be ruled out that whole corns might possibly result in decreasing the productivity due to the depression of nutrient utilizations. Therefore, one must reevaluate the non-forage feeds as well as makes an effort to develop the rational and effective methodology in processing whole corns with the consideration of rumen eco-system.
옥수수 알곡의 가공처리에 의한 영양소 이용성 향상에 관한 연구 I. 한우에 있어서 옥수수 알곡의 가공처리가 In situ 및 In vitro 소화율에 미치는 영향
김완영,김홍욱,이장형,Kim, W.Y,Kim, H.W.,Lee, J.H. 국립한국농수산대학교 교육개발센터 2001 현장농업연구지 = Journal of practical agricultural resear Vol.3 No.1
Experiments were conducted to determine effects of whole and processed corns on in situ disappearance rates of nutrients in the rumen and in vitro degradability of dry matter by rumen microorganisms. Whole corn(WC) was processed into four different types; ground corn(GC), cracked corn(CC), flaked corn(FC), and soaked corn(SC). In the in situ experiment, the rate of ruminal DM disappearance after 48 hour incubation was highest in GC(76.1%) and lowest in WC and SC(12% ; P<0.01). The rate of ruminal CP disappearance after 48 hour incubation was highest in GC and CC(48 and 38%, respectively; P<0.01). The rate of ruminal OM disappearance after 48 hour incubation was highest in GC(76.14%) and lowest in WC and SC(11.82 and 12.26%, respectively; P<0.01). In the in vitro experiment, the two-stage incubation technique was used to measure digestibilities of whole and processed corns. The digestibility of DM was higher in GC, CC and FC(86.95, 85.84 and 82.29%, respectively) than in WC(15.36%; P<0.01).