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서울의 Penicillinase Producing Neisseria Gonorrhoeae 발생빈도(1996)
김재홍,황동규,전재홍,김윤석,김중환,김용준,이창균,임동진,김현수,조창근,김경문,박상훈,전우형,김희성,이호정,차명수,김갑형,김형석,김석우,황지환,박병순,권오상,이민수,송기훈,성소영,이인섭,부태성 대한화학요법학회 1999 대한화학요법학회지 Vol.17 No.2
Background : In recent years, gonorrhea has been panedemic and remains one of the most commom STDs in the world, especially in developing countries. Objective & Methods: For the detection of a more effective therapeutic regimen and assessing the prevalence of PPNG, we have been trying to study the patients who have visited the VD Clinic of Choong-Ku Public Health Center in Seoul since 1980 by means of the chromogenic cephalosporin method. Results: In 1996, 139 strains of N. gonorrhoeae were isolated, among which 53(39.0%) were PPNG. Conclusion: Our results suggests that after a peak of 74.3% in 1993, the prevalence of PPNG in Seoul is gradually declining.
Polyacrylate 수화겔의 약물방출특성에 관한 연구
차효복,이성길,이용택 慶熙大學校 材料科學技術硏究所 1998 材料科學技術硏究論集 Vol.11 No.-
SAc hydrogels were prepared by crosslinking of concentrated aqueous solutions of poly(acrylamide)(PAm) and poly(sodium-acrylate)(PSAc) in N_(2) gas. The equilibrium swelling studies of SAc hydrogels were carried out in solution of varing pH. The gel was swollen extensively in the solution of pH 6 when compared to that of pH 2. Riboflavin and L-ascorbic acid was loaded and the in vitro release studies were carried out in pH solution. The results of this study suggest that drug release is proportion to swelling ratio. SAc hydrogel with drug is corresponded to the soluble matrix pharmaceutical preparation.
자동차 판금용접부의 ESPI법에 의한 변형률 측정에 관한 연구
차용훈,성백섭 朝鮮大學校 機械技術硏究所 2001 機械技術硏究 Vol.4 No.1
Currently the plates used for the various structures has a tendency to being slim to the degree of the sheet metal vis-a-vis the overall measurements of the structure, and the conditions of their usage and load have been getting diverse. As the structure material has been used more and more under the various conditions, the necessity of the strength analysis is to be required. While most of these methods are simply based on the strain gaging method; that is, directly attaching most of the material to the gage, using the non-contact method is still in the early stage. One of the non-contact methods is by the use of the laser that has high-level of the accuracy for the measurement, and this laser also has excellent characteristics on which many studies for its applications are focused throughout the many fields. Therefore, this dissertation is on the measurement of the strain caused by the characteristics of the TIG welded zone which is used with 3D ESPI system that is functionally modified through the laser ESPI system. This 3D ESPI system uses the SPCC metal which are mainly used for the steel plate welded of automobile.
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.
차용훈,김덕중,이연신,채경수,성백섭,박회식 조선대학교 동력자원연구소 1997 動力資源硏究所誌 Vol.19 No.1
The objective of this thesis is to investigate the influence of the initial residual stress on the fatigue crack growth after the distribution of the initial residual stress is measured when the crack is growing from the compressive residual stress to the tensile residual stress field. In the case of as welded material, respective of load ratio, the span of the fatigue is the shortest in base metal, while in weld metal and HAZ, the crack growth was retarded due to the effect of the compressive residual stress at the crack tip as well as the span of the crack is longer than base metal. In region II that is in stable growth state of the fatigue crack, da/dN=C(ΔK)^m of power law was satisfied. Also, it was considered that the value of m is not affected by residual stress. Superimposing welding residual stress intensity factor K_res on ΔK, the value of ΔK_eff calculated was lower than ΔK in the same value of da/dN, while the ΔK_eff is almost the same at the high ΔK.
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.
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%.
차용준,박지영,장성민,김훈,박승영 창원대학교 생활과학연구소 1998 생활과학연구 Vol.- No.2
Voltatile flavor components in salt-fermented Gizzard shad were analyzed by simultaneous steam distillation-solvent extraction gas chromatography/mass spectrometry. One hundred compounds were detected in sample. These compounds were composed mainly of aldehydes(15), ketones(14), alcohols(18), aromatic compounds(7), N-containing compounds(9), esters(15),S-containing compounds(8) and miscellaneous compounds(14). The alcohols were the large amounts in the number of flavor compounds detected in sample. But these compounds may not have an impact on sample flavor because of their high flavor thresholds. The flavor compounds such as aldehydes, ketones, N-containing compounds, esters and S-containing compounds were supposed to be playing a major role in salt-fermented Gizzard shad.
鎔接材에서의 修正係數를 考慮한 疲勞龜裂成長擧動에 관한 硏究
차용훈,윤성운,김덕중 조선대학교 생산기술연구소 1995 生産技術硏究 Vol.17 No.1
In the present paper, based on the results obtaind from 2-dimensional F.E.M. and fatigue test, an empirical equation for the stress intensity factor for CT type plates having discontinuous thickness interfaced is presented. For the β=1 specimen with constant thickness crack growth rate is smoothly increasing in the a-N curve. On the other hand for the β=2 specimen with various thickness, the inflection point observed in crack growth rate near the thickness interface da/dN before compared to the β=1 specimen the inflection point is increased and da/dN after the point is decreased, da/dN near the thickness interface is approached zero. the descending point was preserved earlier as β increased. Considering the relation between da/dN, the crack propagation rates for the case of β=1 increased almost linearly, however the crack propagation rates for β= 2, 3 decreased more rapidly near the thickness interface Additionally, the decreased point in da/dN for β=3 is farther from the thickness interface than the case for β=2.