Application of ESPI to Measurement of Out-of-planeDisplacement in a Spot Welded Canti-levered Plate

백태현,EuiGyunNa,SeungKeeKoh,MyungSooKim 한국정밀공학회 2003 International Journal of Precision Engineering and Vol.4 No.5

Electronic Speckle Pattern Interferometry (ESPI) has been recently developed and widely used because it has the advantage of being able to measure surface deformations of engineering components and materials in industrial areas without contact. The speckle patterns formed with interference and scattering phenomena can measure not only the out-of-plane but also the in-plane deformations. Digital image equipment processes the information included in the speckle patterns and displays the consequent interferogram on a computer monitor. In this study, the experimental results of a canti-levered plate using ESPI were compared with those obtained from the simple beam theory. The ESPI results of the canti-levered plate, analyzed by 4-step phase shifting method, are close to the theoretical expectation. Similarly, out-of-plane displacements of a spot welded canti-levered plate were also measured by ESPI with 4-step phase shifting technique. The phase map of the spot welded canti-levered plate is quite different from that of the canti-levered plate without spot welding.

대전시내 윤락여성 및 접대부의 임질보균 상태와 분리된 임질균주의 페니실린 감수성에 관한 연구

백태현,장명웅,최대경 충남대학교 의과대학 지역사회의학연구소 1977 충남의대잡지 Vol.4 No.2

Despite the great advance of chemotherapy, the incidence of gonorrhea continues to rise at an alarming rate. Furthermore, gradual emergence of strains of N. gonorrhea of increased resistance to penicillin has led to a contemporary problem in controlling of gonorrhea. In Korea, the transmission of gonorrhea has usually occured through the prostitutes while transmission through the non-prostitutes has been rare. We studied the gonococcal carrier states of the 231 prostitutes and 214 entertainers in Daejeon area during period from July 5, 1977 to August 9 by cervical or vaginal culture method. Also studied penicillin susceptibility and presence of PPNG of the isolated gonococcal strains. The results are summarized as follows: 1. The average gonococcal prevalence rate of the prostitutes and entertainers were 24.6% and 5.3%, respectively. 2. The period gonococcal prevalence rate(person) of the prostitutes and entertainers were 39% and 9%, respectively. 3. MIC of penicillin varied from 0.5 unit/ml to 3.0 unit/ml was 98.6% of the isolated 71 gonococcal strains. 4. No PPNG was found in the isolated 71 gonococcal strains.

효소결합면역분석법(ELISA)에 의한 결핵의 진단적 의의에 관한 연구

백태현,최대경 충남대학교 의과대학 지역사회의학연구소 1984 충남의대잡지 Vol.11 No.2

In the hope of developing a rapid and early serodiagnostic test of tuberculosis with sufficient specificity and sensitivity for large scale use in clinical laboratories, the levels of IgG antibody binding to sonicate antigen of Mycobacterium tuberculosis(H_37,Rv antigen) in sera from 128 patients with active pulmonary tuberculosis and 100 control individuals were measured by plastic tube enzyme-linked im.munosorbent assay(ELISA). In this study, the levels of IgG antibody binding to H_37,Rv antigen in sera from all patients and controls were measured at the serum dilution of 1 : 100 as a screening test and IgG antibody activities to H_37,Rv antigen in sera from 20 controls (group I) and 40 patients(groupll and III) were compared with those to other mycobacterial antigens such as Mycobacterium tuberculosis H_37,Ra, Mycobacterium bovis BCG, Mycobacterium kansasii, Mycobacterium fortuitum, and Mycobacterium smegmatis. Finally, the levels of IgG antibody binding to H_37,Rv antigen in sera from all patients and controls were measured before and after absorption of 1 : 400 diluted sera with Mycobacterium kansasii antigen for the serodiagnosis of tuberculosis. The results were summarized as follows: 1. At the serum dilution of 1:100, the mean ELISA values of IgG antibody activities to H_37,Rv antigen in sera from all patients and controls were 1.265±0.432 and 0.394±0.179, respectively. 2. The IgG antibody binding to Mycobacterium kansasii antigen was the greatest of 6 mycobacterial antigens in sera from controls(group I) and patients(group II and III) and the IgG antibody binding to BCG antigen vas even greater than to H_37,Rv antigen in sera from controls (group I ). 3. At the serum dilution of 1 : 400, the mean ELISA values of IgG antibody activities to H_37Rv antigen in sera from all patients and controls were 1.147±0.399 and 0.335±0.164, respectively. 4. The mean ELISA values of IgG antibody activities to H_37,Rv antigen in sera from all patients and controls after absorption of 1 : 400 diluted sera with Mycobacterium kansasii antigen were 0.934±0.397 and 0. 192±0.079, respectively. 5. The specificity and sensitivity in the assay of IgG antibody activities to H_37,Rv antigen were 96.0% and 85.2% before absorption of 1 : 400 diluted sera with Mycobacterium kansasii antigen, and were 95.0% and 93.8% after absorption, respectively.

폐결핵 환자로부터 분리된 결핵균의 각종 항결핵제에 대한 감수성에 관한 연구

백태현,최대경,권지순 충남대학교 의과대학 지역사회의학연구소 1984 충남의대잡지 Vol.11 No.1

Drug resistance, whether acquired as a result of inappropriate or inadequate chemotherapy or from an individual whose organism was drug resistant, may present serious obstacles to the eradication of tuberculosis. The authors attempted direct drug susceptibility test to various primary and second line antitubereulosis drugs on 139 isolates from pulmonary tuberculosis patients who have been hospitalized at National Kongju Hospital for tuberculosis. The results were summarized as follows; 1. Out of 101 tuberculosis patients, male patients were slightly more than female as a ratio of 1.59: 1 and the average age of onset was 30 years. 2. The number of patients who have been suffered from pulmonary tuberculosis more than 6 years was 61 (60.4%). 3. A11 of 139 isolated tubercle bacilii were resistant to one or more antituberculosis drugs. 4. Out of 139 isolates, 94.2% was resistant to INH, 89.2% to EMB, 75.5% to SM, 63.3% to PZA, 56.1% to RMP,47.5% to KM, 42.4% to PAS, 27.3% to CS, 16.5% to PTA and 2.9% to TUM. 5. Resistances to INH-SM-PAS, INH-SM-EMB, INH-SM-RMP, INH-EMB-RMP, PTA-PZA-CS and INH-SM-TUM were 36.0%, 69.1%, 41.0%, 46.8%, 7.2% and 2.9%, respectively. 6. Resistances to INH-EMB-RMP-PZA and INH-SM-RMP-PZA were 31.7% and 27.3%, respectively.

광탄성 위상이동법을 이용한 주응력 방향 측정법

백태현,김명수,김환 대한기계학회 2004 大韓機械學會論文集A Vol.28 No.12

정수압을 받는 축대칭 절두체 원추형 압력용기의 응력해석

백태현,정태진,Baek, Tae-Hyun,Chung, Tae-Jin 한국정밀공학회 1992 한국정밀공학회지 Vol. No.

Theoretical equations for hoop stress, longitudinal or meridian stress and Von Mises stress of an axismmetric conical pressure vessel and a frustum of conical pressure velle, both of which are pressuized by hydrostatic loading, are derived from equilibrium equations. The membrane stresses conputed by theoretical equations for a conical pressure vessel and a frustum of conical pressure vessel are compared with the values obtained from finite elelment method. Based on the fact that the computational values by theoretical equations are well agreed with the finite element results, derived equations are proved to be valid and it is possible for those equations to be conveniently used for structural analysis or design of frustum of conical pressure vessel which is a part of silo body.

역사영화의 역사 재구성 방법 연구 - <서울의 봄>을 중심으로

백태현 한국영상학회 2024 한국영상학회 논문집 Vol.22 No.5

이 연구는 역사영화로서 <서울의 봄>(김성수, 2023)의 시대적 욕망과 무의식을 분석하는 것을 목표로 하였다. <서울의 봄>은 한국영화에서 그동안 다루지 않았던 12.12 군사 쿠데타를 다루면서 많은 담론을 생산해 냈다. 특히 그동안 현대사를 다루었던 영화들이 제한된 소재를 가지고 있었다는 점에서, <서울의 봄>은 한국의 역사영화의 스펙트럼을 확장하는데 기여했다고 평가할 수 있다. 현대사를 배경으로 한 역사영화는 영화가 제작된 시대의 욕망과 무의식을 반영해, 말하고 싶지만 말하지 못했던 것을 우회적 표현하고 있을 가능성이 높다. 본 연구는 이러한 점을 염두에 두고 <서울의 봄>이 가지고 있는 내러티브와 특징을 분석한 다음 <서울의 봄>이 관객들을 소구한 지점에 동시대의 역사적 무의식이 숨어 있다고 보았다. 그것을 파악하기 위해 영화 속 인물들의 구도를 살펴본 다음, 특정 캐릭터의 모습에 대해 분석을 시도하였다. 연구의 결과, <서울의 봄>은 단순히 12.12 군사 쿠데타라는 역사적 사건을 다루는 것에 그치지 않고, 현재 한국 사회의 기원과 그것의 절차적 정당성에 대한 의문을 반영하고 있음을 알 수 있었다. 이는 영화가 단순한 과거의 재현을 넘어서 현재의 사회적 욕망과 갈등을 반영하는 복합적 산물임을 보여준다. 이 연구는 단일 작품만을 대상으로 했다는 한계와 제작 시기의 시대상에만 머물렀다는 과제가 남아 있다. 그러나 역사영화의 재현적 특성과 영화를 통한 이데올로기적 분석을 시도했다는 점에서 본 연구의 의의를 찾을 수 있다. This study aims to analyze the desires and unconsciousness of the period in 12·12 The Day as a historical film. 2·12 The Day generated a considerable amount of discourse, as it dealt with the 12.12 military coup, which had remained unaddressed in Korean cinema. It can be said that 2·12 The Day contributed to expanding the spectrum of Korean historical films, especially considering that films thus far dealing with contemporary history contain only limited material. Historical films focusing on modern history are likely to reflect the desires and unconsciousness of the times in which they were made and to express sentiments that were desired to be expressed at the time but were not. With this in mind, this study analyzes the narrative and features of 2·12 The Day and suggests that the historical unconsciousness of the contemporary era is hidden at the point where 2·12 The Day calls to the audience. To identify this, I examine the composition of the characters in the film and then analyze the appearance of specific characters. The results here demonstrate that 2·12 The Day does not simply deal with the historical event of the December 12 military coup but also reflects questions about the origins of the current political dominance in South Korea and its procedural legitimacy. This shows that cinema is a complex product that goes beyond simple representations of the past and reflects current social desires and conflicts. This study is limited by the fact that it focused on a single film and was limited to the period of its production as well. However, the significance of this study is that it attempts to analyze the reproductive nature of historical films and their ideologies.

光彈性技法을 利用한 應力强度係數 測定

白泰鉉 群山大學校自然科學硏究所 1990 自然科學硏究 Vol.5 No.-

Coefficients of power series type Williams equations, together with the exact origin of the crack, were calculated from data sets on the fringe sharpened isochromatic loops in the vicinity of the crack tip. Results of calculated values were evaluated by comparing experimental data points with the regenerated theoretical fringe loops. Accuracy evaluation indicated that the first four terms of Williams equations are sufficient to describe the stress field in the vicinity of the crack tip for both Mode I and Mixed Mode cases.

반하백출천마탕(半夏白朮天麻湯)과 반하백출천마탕가미방(半夏白朮天麻湯加味方)의 항암효과(抗癌效果)와 면역반응(免疫反應)에 관(關)한 실험적(實驗的) 연구(硏究)

백태현,류봉하,박동원,류기원,Baek, Tae-Hyoun,Ryu, Bong-Ha,Park, Dong-Won,Ryu, Ki-Won 대한암한의학회 1995 大韓癌韓醫學會誌 Vol.1 No.1

In order to investigate the effects of Banhabaekchulcheonmatang and Banhabaekchulcheonmatanggamibang on antitumor effects after Sarcoma-180 cells transplantation into the peritoneal cavity or left groin in mice, and immune responses in mice induced by methotrexate, the extracts of its herbal medicines were orally administered for 14 or 21 days. Experimental studies were performed for measurance of mean survival days, tumor and body weight for antitumor effects, and delayed type hypersensitivity, hemagglutinin titer, hemolysin titer, rosette forming cells, natural killer cell activity and phagocytic activity for immune responses in ICR mice. Following results were obtained : 1. Mean survival time in Banhabaekchulcheonmatang and Banhabaekchulcheonmatanggamibang-treated group was significantly prolonged, as compared with the control group(P<0.010, P<0.005). 2. Tumor weight in Banhabaekchulcheonmatang and Banhabaekchulcheonmatanggamibang-treated group was significantly depressed, as compared with the control group(P<0.050, P<0.050). 3. Body weight in Banhabaekchulcheonmatang-treated group was significantly increased (P<0.050), but in Banhabackchulcheonmatanggamibang-treated group was slightly increased with no effectivenes, as compared with the control group. 4. Delayed type hypersensitivity in Banhabaekchulcheonmatang and Banhabaekchulcheonmatanggamibang-treated group was significantly increased, as compared with the control group(P<0.010, P<0.050). 5. Hemagglutinin titer in Banhabaekchulcheonmatang and Banhabaekchulcheonmatanggamibang-treated group was significantly increased, as compared with the control group(P<0.050, P<0.050). 6. Hemolysin titer in Banhabaekchulcheonmatanggamibang-treated group was significantly increased (P<0.050), but in Banhabaekchulcheonmatanggamibang-treated group was slightly increased with no effectiveness, as compared with the control group. 7. Rosette forming cells in Banhabaekchulcheonmatang and Banhabaekchulcheonmatanggamibang-treated group was slightly increased with no effectiveness, as compared with the control group. 8. Natural Killer cell activity in Banhabaekchulcheonmatang and Banhabaekchulcheonmatanggamibang-treated group was slightly increased with no effectiveness, as compared with the control group. 9. Phagocytic activity in Banhabaekchulcheonmatanggamibang-treated group group was significantly increased (P<0.050), but in Banhabaekchulcheonmatanggamibang-treated group was increased with no effectiveness, as compared with the control group. According to the above results, it could be suggested that Banhabaekchulcheonmatang and Banhabaekchulcheonmatanggamibang have prominent antitumor effects, and enhance both cellular and humoral immunity.

등각사상 맵핑 및 광탄성 실험법에 의한 원형구명 주위의 하이브리드 응력장 해석

백태현,김명수,이주훈,Baek, Tae-Hyun,Kim, Myung-Soo,Rhee, Ju-Hun 대한기계학회 1999 大韓機械學會論文集A Vol.23 No.6

An experimental study is presented for the effect of number of terms of a pewee series type stress function on stress analysis around a hole in tensile loaded plate. The hybrid method coupling photoelastsic data inputs and complex variable formulations involving conformal mappings and analytical continuity is used to calculate tangential stress on the boundary of the hole in uniaxially loaded, finite width tensile plate. In order to measure isochromatic data accurately, actual photoelastic fringe patterns are two times multiplied and sharpened by digital image processing. For qualitative comparison, actual fringes are compared with calculated ones. For quantitative comparison, percentage errors and standard deviations with respect to percentage errors are caculated for all measured points by changing the number of terms of stress function. The experimental results indicate that stress concentration factors analyzed by the hybrid method are accurate within three percent compared with ones obtained by theoretical and finite element analysis.