소에서 盲腸擴張을 동반한 第4胃食滯 手術 1例

김명철,김덕환,신상태,임준호,김남중,김종만 충남대학교 수의과대학 동물의과학연구소 1998 動物醫科學硏究誌 Vol.6 No.-

Abomasal impaction with cecal dilatation was diagnosed in a 3 years old holstein cow. The clinical signs were loss of appetite, scant feces and moderate distension of the abdomen. Ping sound was revealed in the right 11th intercostal space by auscultation. Cecal dilatation and abomasal impaction were ascertained by right flank laparotomy and abdominal exploration, and intestinal content and gas were removed from the cecal apex incised. One day later, 2.5㎏ of sand was removed by ventral paramedian abomasotomy.

국민 여가활동기회의 효율적인 분배와 생산유인 효과 확대를 위한 스포츠시설 및 스포츠 관련 산업의 관광자원화 방안을 위한 연구

남덕현,김천중,이주형 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.1

The purpose of this study is to examine the recognition and satisfaction of sport tourism as an area of tourism industry, and show the actual status of sport tourism, suggest the strategies to develop sport tourism goods according to sports tourism resources. This study is based on the survey of residents, physical education teachers, tour industry managers and local government employees, who were asked about what impact sports tourism had on local societies and environments. The data obtained from the returned questionnaire were coded and transcribed for a statistical analysis. collected data were analyzed though SPSS 10.0using such statical methods as a descriptive statistical analysis, chi square test, ANOVA test. With the twenty first century upcoming, sport tourism is recognized as a necessity of life for every person in the world. In addition, the rapid changes of social phenamenons such as the changing of a basic sense of value and life style. the improvement of income, the development of traffic systems, communication facilties, and medias, have a great influence on the desire for sport tourism. Compared with the past tourism that were mostly passive and superficial sight seeing tour, sport tourism is an active and exhilarating tour, therefore sport tourism could provide tourist with satisfaction of needs. Sports tourism is sure to become one of major industries. This study was done with the limited data, so the result does not fully represent the comprehensive impact of sport tourism and strategies of sport tourism resources.

신경회로망을 이용한 용접잔류응력 예측에 관한 연구

차용훈,김일수,김하식,이연신,김덕중,성백섭,서준열 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.6

In order to achieve effective prediction of residual stresses, the series experiment were carried out and the residual stress-es were measured using the backpropagation algorithm from the neural network and the sectional method. Using the experimental results, the optiomal control algorithms using a neural network should be developed in order to reduce the effect of the external disturbances on residual stresses during GMA welding processes. The results obtained from the comparison between the measured and calculated results, showed that the neural network based on backpropagation algorithm can be used in order to control weld quality. This system can not only help to under-stand the interaction between the process parameters and residual stress, but also, improve the quantity control for welded structures. The development of the system is goal in this study.

알루미늄 합금 용접부의 피로강도 평가에 대한 연구

차용훈,김덕중 조선대학교 생산기술연구소 1995 生産技術硏究 Vol.17 No.2

The objective of this thesis is to investigate the influence of welding residual stresses on the fatigue growth behavior of cracks located transverse to the weld bead. For this purpose, G.T.A. (Gas Tungsten Arc) welding was performed on the AI. Alloy 1100-O plate and the same initial crack is made on HAZ(Heat Affected Zone), weld metal and base metal respectively. C.T.(Compact Tension) specimens were used as experimental material. Initial welding residual stresses were measured by using strain gage sectioning method. All specimens were tested under constant amplitude load with stress ratio R=0.1.

알루미늄 合金 熔接部의 疲勞龜裂成長擧動에 關한 破壞力學的 硏究

차용훈,김덕중 한국공작기계학회 1996 한국생산제조학회지 Vol.5 No.3

the objective of this study is to investigate the influence of welding residual stresses on the fatigue crack growth behavior of cracks located transverse to the weld bead. For this purpose G.T.A. (Gas Tungsten Arc) welding was performed on the A1 alloy 1100-O plate and the same initial crack is made on HAZ(Heat Affected Zone), weld metal and base metal respectively. Specimens were used CT(Compact Tension) specimens. Initial welding residual stresses were measured by using strain gage sectioning method. All specimens were tested under constant amplitude load with stress ratio R=01, It is possible to predict fatigue crack growth behaviors and the fatigue life, using numerical analysis together with distribution of initial residual stress and the values of C and m obtained from da/dN-ΔK

變厚板材에서 S.I.F.의 數値解析에 關한 硏究

차용훈,김덕중 조선대학교 생산기술연구소 1994 生産技術硏究 Vol.16 No.2

This study is to analyze the S.I.F. K value upon Mode I cracks in a finite-width plate of varying thickness, which is expressed in terms of width ratio(ω), thickness ratio(β) and non-dimensional crack length(λ) by using the 2-dimensional and 3-dimensional finite element method. Comparing the effectiveness of the results obtained by the two finite element methods, thease errors were under 7% at most. Then, it is seen that the 2-dimensional finite element method can be used in order to analyze the S.I.F. K values upon a various thickness model. To analyze S.I.F in the various thickness Model by using the 2-dimensional finite element method, this analysis was done in the case of plane strain condition with a view to plate thickness including crack.

點 熔接部의 變形率 測定 및 影響 評價

차용훈,김덕중,성백섭 한국공작기계학회 1997 한국생산제조학회지 Vol.6 No.3

Electronic Speckle Pattern Interferometry(ESPI) using the Model 95 Ar. laser, a video system and an image processor was applied to the in-plane displacement measurements. Unlike traditional strain gauges or Moire method, ESPI method requires no special surface preparation or attachments and can be measured in-plane displacement with no contact and real time. In this experiment specimen was loaded in parallel with a loadcell. The specimen was the cold rolled steel sheet of 2mm thickness, which was attached strain gauges. The study provides an example of how ESPI have been used to measure strain displacement in this specimen. The results measured by ESPI compare with the data which was measured by strain gauge method in tensile testing.

인장-전단하중을 받는 점 용접재의 변형률 분포 특성 평가

차용훈,김덕중,이연신,성백섭 한국공작기계학회 1999 한국생산제조학회지 Vol.8 No.6

In order to evaluate strength of spot welded joint, at first it is importent that we should know strain distribution near nugget zone. During loading, in HAZ, compressive strain increase with Increase of load, but in nugget zone, tensile strain increase. During unloading, on the other hand, even though the load decreases, the strain variation is not almost appeared in nugget zone and HAZ. In nugget boundary zone, the strain range increases continuously along with load increase on outer surface, but the strain increases continuously and decreases rapidly beyond yield strength on inner surface. In this paper, strain distribution are measured in inner and outer surface with variation of thickness and load under tensile-shear load. Tensile-shear strength increased as with increase of specimen thickness. As for thickness increase rates are 25%, 50%, 100%, and 150%, tensile-shear strength increase rates are 40%, 81%, 130% and 228%.

Photo Stress를 이용한 압력용기 용접부의 잔류응력 측정

차용훈,김덕중,장훈 朝鮮大學校 機械技術硏究所 2004 機械技術硏究 Vol.7 No.1

Recently, studies on the deformation and residual stresses measurement in pressure vessel welded zone have been obtained from strain gaging method which had directly attached the gage on the surface of the material. But the non-contact method are not still general. In this paper, we will study effect on residual stress at the pressure vessel welded zone under the high pressure. The strain and residual stresses are measured by the photo-stress and hole drilling method. The material of Butt weld specimens are A516 GR70 steel for pressure vessel.

ESPI法을 利用한 點 熔接部의 面內變位 測定에 關한 硏究

차용훈,김덕중,이연신,채경수,성백섭 조선대학교 생산기술연구소 1997 生産技術硏究 Vol.19 No.1

Electronic Speckle Pattern Interferometry(ESPI) using the Model 95 Ar laser, a video system and an Image processor was applied to the in-plane displacement measurements. Unlike traditional strain gauges or Moire method, ESPI method requires no special surface preparation or attachments and can be measured in-plane displacement with no contact and real time. In this experiment specimen was loaded in parallel with a loadcell. The specimen was the cold rolled steel sheet of 2mm thickness. which was attached strain gauges. The study provides an example of how ESPI have been used to measure strain displacement in this specimen. The results measured by ESPI compare with the data which was measured by strain gauge method in tensile testing.