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황재석,서재국,이효재,남정환,최영철,Hwang, Jae-Seok,Seo, Jae-Guk,Lee, Hyo-Jae,Nam, Jeong-Hwan,Rowlangs, R.E.,Choe, Yeong-Cheol 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.3
SPATE(Stress Pattern Analysis by Thermal Emission) can be effectively used to analyze the stress distributions of isotropic structure under the repeated load by non-contact. In this research, the measuring method and the measuring concept of stress intensity factor of isotropic material by SPATE are suggested. The validity of the method and the concept was certified through SPATE experiment.
황재석,서재국,이효재,남정환,Hwang, Jae-Seok,Suh, Jae-Guk,Lee, Hyo-Jae,Nam, Jeong-Hwan,Rpwlands, R.E. 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.10
SPATE(Stress Pattern Analysis by Thermal Emission) can be effectively used to analyze the stress distribution of the orthotropic structure under the repeated load by non-contact. In this research, the measuring conception and method of stress intensity factor of orthotropic material using SPATE are suggested. The relationships between the maximum values of SPATE signal and $1/\sqrt{X'}$ (or $1/\sqrt{y'}$) are theoretically established in the vicinity of crack tip of the orthotropic material. It is certified through SPATE experiment that their linear quality is very excellent.
등방성/직교이방성 이종재료의 진전 계면균열에 대한 동적 광탄성 실험 하이브리드 법 개발
황재석,신동철,김태규,Hwang, Jae-Seok,Sin, Dong-Cheol,Kim, Tae-Gyu 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.7
When the interfacial crack of isotropic/orthotropic bi-materials is propagated with constant velocity along the interface, stress and displacement components are derived in this research. The dynamic photoelastic experimental hybrid method for the bimaterial is introduced. It is assured that stress components and dynamic photoelastic hybrid developed in this research are valid. Separating method of stress components is introduced from only dynamic photoelastic fringe patterns. Crack propagating velocity of interfacial crack is 69∼71% of Rayleigh wave velocity of epoxy resin. The near-field stress components of bonded interface of bimaterial are similar with those of pure isotopic material and two dissimilar isotropic bimaterials under static or dynamic loading, but very near-field stress components of bonded interface of bimaterial are different from those.
비심장성 흉통환자에서 Edrophonium 유발검사후 식도 수축파변화의 의의
황재석(Jae Seok Hwang),강영우(Young Woo Kang) 대한내과학회 1995 대한내과학회지 Vol.49 No.3
N/A Objectives: Although Edrophonium chloride is a widely used provocative test to assess noncardiac chest pain, the change in esophageal contractions and its clinical implication leave much to be criticized. This study was performed to examine the changes in esophageal contractions and its significance after Edrophonium provocative test. Methods: Forty two patients complaining of noncardiac chest pain and thirteen control subjects were selected from Keimyung University Dongsan Hospital between September 1988 and May 1993, and were categorized into three groups. The first group comprises of 13 normal adults as control. The second group consists of 25 patients with nor- mal esophageal manometry but complained of chest pain. The third group comprises of 17 patients with nutcracker esophagus. After Edrophonium provocative test, the amplitude and duration of esophageal contractions were measured and compared among groups. Results: Age and sex distribution were not significantly different among three groups. In patients with nutcracker esophagus, not only the difference of amplitude (p=0.0016) and duration of esophageal contractions(p=0.001) but also the percent change of duration(p=0.008), between basal state and after Edrophonium showed significant increase. Furthermore, ANCOVA analysis in which the basal value was taken into consideration, also showed significant increase in duration of esophageal contractions in patients with nutcreacker esophagus. The calculated regression coefficient from this analysis can be used as another tool for diagnosing nutcracker esophagus. Conclusion: Among the patients complaining of noncardiac chest pain the duration of esophsgeal contractiona in patients with nutcracker esophagus, increased significantly after Edrophonium pro- vocative test. Although this can he used as another tool for diagnosing nutcracker esophagus, further clinical studies are needed.
식도운동질환과 위식도역류질환에서 산청소능 비교 - 저진폭수축파 비특이성 식도운동질환을 중심으로
황재석(Jae Seok Hwang),강영우(Young Woo Kang) 대한소화기학회 1995 대한소화기학회지 Vol.27 No.5
N/A Background/Aims: The aim of this study was to evaluate acid clearance in esophageal disease, a common cause of noncardiac chest pain, and to evaluate the correlation between the swa]lowing number for acid clearance and the amplitude of contractions. Methods: The study population was divided into four groups. Group 1(n=8) was controls with no complaints of any gastrointestinal symptoms. Group II(n=9) was gastroesophagea1 reflux disease. Group III(n=6) was nutcracker esophagus. Group IV(n=7) was nonspecific esophageal motility disorder with low amp]itude contractions. We performed standard acid clearance test and compared it with the amplitude of esophageal contractions. Results: In Group I, the swal]owing number was 6.12+ 0.58(mean+ SE); in Group II, 15.33 3.96; and in Group lll and IV, 9.83 + 2.70 and 20.42 ' 4.43 respectively. The number of swallowing was significantly increased in Group IV than in the other groups(P=0.05) and showed the reversed correlation with amplitude(r=-0.81, p=0.026). Conclusions: Group IV had significantly delayed esophageal acid clearance and also showed the reversed correlation with amplitude. (Korean J Gastroenterol 1995;27: 493-498)
만성변비증에서 반고형식 Lactulose 수소호기 검사법을 이용한 구강맹장 통과시간의 지연
황재석(Jae Seok Hwang),강영우(Young Woo Kang) 대한내과학회 1996 대한내과학회지 Vol.50 No.2
N/A Objectives: Colon dysmotility is generally considered to be the main cause of chronic constipation. This study was performed to determine the effect of small bowel dysmotility and the usefullness of semisolid lactulose hydrogen breath test in evaluating chronic constipation. Methods: Twenty-seven patients affected by chronic constipation and twenty-seven control subjects were matched for age and sex between March of 1993 and June of 1994 at Keimyung University Dong San Hospital. Orocecal transit time was measured by serial determination of breath hydrogen after administering a semisolid meal and 20g of lactulose diluted in 100ml of water. Results: In comparison with controls, orocecal transit time was significantly delayed in the group with chronic constipation(112.9±7.4min vs 81.4±2.5 min, p<0.001). Delay of orocecal transit time was observed in fourteen of twenty-seven(51.8%) chronic constipation. Conclusion: The results show that small bowel as we11 as colonic dysmotility play an important role in the pathophysiology of chronic constipation. Moreover, the semisolid lactulose hydrogen breath test is shown to be a useful method in its evaluation. This study further provides a theoretical background in the use of prokinetics in chronic constipation