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윤세웅(Yun Seung),박두희(Park Duhee),이승호(Lee Seungho),황영철(Hwang Youngchul) 한국지반환경공학회 2009 한국지반환경공학회논문집 Vol.10 No.1
지진동에 대한 사면의 안정성은 일반적으로 지진계수를 이용하여 지진하중을 유사정적 하중으로 단순화하여 한계평형법으로 평가된다. Transient 지진동은 지진계수를 이용하여 정적하중으로 대체된다. 하지만, 유사정적 해석결과에 절대적인 영향을 미치는 지진계수는 합리적인 물리적 근거 없이 산정된다. 또한 내진설계기준에 의거하여 산정되는 최대가속도는 사면의 진동특성을 반영한다고 볼 수 없으며, 이를 정확하게 예측하기 위해서는 2차원 동적해석을 수행해야 한다. 본 연구에서는 수정된 1차원 동적해석과 유사정적해석을 연결한 Hybrid 유사정적 해석법을 제안하였다. 기존의 해석기법은 깊이에 따라서 변이하는 가속도를 고려할 수 없기에 신뢰성 있는 사면의 안정성 예측이 어려운 실정이다. 수정된 1차원 지반응답해석은 깊이에 따른 사면 무게변화를 모델링하기 위하여 층의 밀도를 조정하였으며 위치별 진동가속도를 예측하기 위해서 다수의 해석을 수행하였다. 2차원 유한요소해석과 비교한 결과, 수정된 1차원 해석은 2차원 해석과 일치성이 우수한 것을 확인할 수 있었다. 해석결과를 유사정적해석에 입력하여 깊이에 따라서 변이하는 가속도 주상도를 적용하였으며 기존의 해석방법으로 계산된 안전율과 비교하였다. 비교 결과, 계산된 안전율에는 큰 차이가 발생하는 것으로 나타났으며, 기존의 해석기법으로 안전율을 예측할 경우, 매우 비현실적인 값을 계산할 수 있다. 본 연구에서 개발된 기법은 해석의 신뢰성을 현격하게 향상시키는 것으로 나타났다. The seismic slope stability is most often evaluated by the pseudo-static limit analysis, in which the earthquake loading is simplified as static inertial loads acting in horizontal and/or vertical directions. The transient loading is represented by constant acceleration via the pseudostatic coefficients. The result of a pseudostatic analysis is governed by the selection of the value of the pseudostatic coefficient. However, selection of the value is very difficult and often done in an ad hoc manner without a sound physical reasoning. In addition, the maximum acceleration is commonly estimated from the design guideline, which cannot accurately estimate the dynamic response of a slope. There is a need to perform a 2D dynamic analysis to properly define the dynamic response characteristics. This paper develops a new hybrid pseudostatic method that links the modified one-dimensional seismic site response analysis and the pseudostatic algorithm. The modified site response analysis adjusts the density of the layers to simulate the change in mass and weight of the layers of the slope with depth. Multiple analyses were performed at various locations within the slope to estimate the change in seismic response of the slope. The calculated peak acceleration profiles with depth from the developed procedure were compared to those by the two-dimensional analyses. Comparisons show that the two methods result in remarkable match. The calculated profiles are used to perform pseudostatic analysis. The results show that use of peak or a fraction of acceleration at the surface can seriously underestimate or overestimate the factor of safety, and that the proposed procedure significantly enhances the reliability of a standard procedure.
급성 골수성 백혈병에서 이식 편대 숙주반응 치료 중 발생한 노르웨이 옴
임세웅 ( Se Woong Lim ),윤숙정 ( Sook Jung Yun ),최우연 ( Woo Yeon Choi ),백희조 ( Hee Jo Baek ),국훈 ( Hoon Kook ),이지범 ( Jee Bum Lee ),김성진 ( Seong Jin Kim ),원영호 ( Young Ho Won ),이승철 ( Seung Chul Lee ) 대한피부과학회 2007 대한피부과학회지 Vol.45 No.8
Norwegian scabies is a crusted non-itchy rash caused by massive infestation with the mite Sarcoptes scabiei. It is usually associated with immunosuppression or neurologic impairment, although it has rarely been reported in normal persons. We report a case of Norwegian scabies in 6-year old girl with acute myeloid leukemia associated graft-versus-host disease. The lesion showed pruritic, hyperkeratotic scaly plaques and fissures on the entire body. Application of a mineral oil preparation from hyperkeratotic areas showed numerous scabies mites. Treatment with 10% crotamiton cream for two weeks resulted in marked regression of the skin lesions, but finally she died of sepsis due to deterioration of her systemic conditions. (Korean J Dermatol 2007;45(8):836∼839)
환자 피부 비늘 및 임상주에서 이중 중합효소 연쇄반응(Nested PCR)을 이용한 Malassezia 균종의 동정
임세웅 ( Se Woong Lim ),신명근 ( Myung Geun Shin ),임주영 ( Ju Young Lim ),윤숙정 ( Sook Jung Yun ),김성진 ( Seong Jin Kim ),이승철 ( Seung Chul Lee ),원영호 ( Young Ho Won ),이지범 ( Jee Bum Lee ) 대한피부과학회 2008 대한피부과학회지 Vol.46 No.4
Background: Due to recent identification of new Malassezia (M.) species, M. dermatis, and M. equi, the genus Malassezia was revised into eleven species that have been isolated from human and animal skin. This has further substantiated the need for molecular techniques to distinguish the various Malassezia species. Objective: We aimed to make the nested polymerase chain reaction (PCR) using species-specific primers with specificity and sensitivity as a diagnostic tool for differentiating the various Malassezia species from skin scales and fungal cells rapidly and accurately. In addition, we evaluated the common causative Malassezia species in the patients with seborreheic dermatitis, pityriasis versicolor or pityrisporum folliculitis. Methods: Malassezia species-specific primers were designed based on DNA sequencing of the ribosomal RNA gene. The standard strains of eight members of the genus Malassezia such M. pachydermatis, M. furfur, M. sympodialis, M. globosa, M. obtuse, M. restricta, M. slooffiae, and M. dermatis were used for positive control. Each Malassezia species was cultured separately and two or three standard species were cultured together on Modified Leeming and Notman agar (MLNA) media plates. In addition, twenty-five clinical strains of Malassezia species isolated from the skin of patients with dermatological conditions and twenty-three samples of skin scale were used as well. Results: The nested PCR assay with primers for all eight Malassezia species were species-specific since it amplified DNA only from the target Malassezia species, and could differentiate mixed, that is, the two or three Malassezia species of all standard strains grown on MLNA medium precisely. Detection of Malassezia species from clinical strains and patient skin scales using the nested PCR assay was 96% (24/25) and 87% (20/23), respectively. M. globosa, M. sympodialis, M. restricta were the most common causative Malassezia species in patients with pityriasis versicolor, pityrosporum folliculitis, seborrheic dermatitis, respectively. Conclusion: Nested PCR using species-specific primers is useful and reliable in the detection of various Malassezia species from patient skin scales as well as cultured fungal cells. (Korean J Dermatol 2008;46(4):446~452)
급성 골수성 백혈병 환자에서 발생한Fusarium solani에 의한 전신 감염증
임세웅 ( Se Woong Lim ),김형준 ( Hyung Joon Kim ),신명근 ( Myung Geun Shin ),이재혁 ( Jae Hyuk Lee ),윤숙정 ( Sook Jung Yun ),이지범 ( Jee Bum Lee ),김성진 ( Seong Jin Kim ),원영호 ( Young Ho Won ),이승철 ( Seung Chul Lee ) 대한피부과학회 2008 대한피부과학회지 Vol.46 No.6
Fusarium species are known as ubiquitous soil saprophytes and human skin contaminants. Infections caused by Fusarium species are increasing in frequency among immunocompromised hosts. We report a rare case of fatal disseminated infection caused by Fusarium solani in an acute myeloid leukemia patient. Skin biopsy specimen revealed multiple branched hyphae and spores in the vessel with thrombus formation, and fungal culture showed a fuzzy, whitish colony. Direct sequencing of 28S rRNA gene confirmed the isolate as Fusarium solani. (Korean J Dermatol 2008;46(6):846∼850)
임세웅 ( Se Woong Lim ),임주영 ( Ju Young Lim ),윤숙정 ( Sook Jung Yun ),김성진 ( Seong Jin Kim ),이승철 ( Seung Chul Lee ),원영호 ( Young Ho Won ),이지범 ( Jee Bum Lee ) 대한피부과학회 2008 대한피부과학회지 Vol.46 No.4
We describe a 56-year-old Korean man with paraneoplastic pemphigus (PNP) associated with persistent generalized exfoliative dermatitis (GED). He developed multiple scattered flaccid bullae on the erythematous base with scales over his face, upper trunk and extremities, with mucosal involvement for 4 months. Due to myasthenia gravis he also suffered from ptosis, general weakness, and weight loss of 10 kg for a month. A computed tomography and histopathological examination of the chest revealed a mass in the anterior mediastinum which was confirmed as thymoma. During the course of disease, his erythematous patch with crust lesions became confluent, and then GED developed. After total thymectomy, GED waxed and waned for 2-years and eventually disappeared. Herein, we report an interesting case of PNP associated with persistent GED for at least 2 years, even though the patient had been treated with surgery and medication. (Korean J Dermatol 2008;46(4):494~498)
악성 흑색종과 유사한 조직학적 소견을 보인 다발성 황색육아종
임세웅 ( Se Woong Lim ),윤숙정 ( Sook Jung Yun ),이지범 ( Jee Bum Lee ),김성진 ( Seong Jin Kim ),이승철 ( Seung Chul Lee ),원영호 ( Young Ho Won ) 대한피부과학회 2007 대한피부과학회지 Vol.45 No.11
Juvenile xanthogranuloma (JXG) is a benign histiocytic proliferative disorder in which one, several, or occasionally numerous red to yellow nodules are present. The lesion may be present at birth, but usually arises in early infancy. Adult-onset xanthogranuloma differs clinically from juvenile xanthogranuloma in that the lesion is usually solitary, does not involve internal organs and generally does not resolve spontaneously. We report a case of multiple xanthogranuloma in an adult which occurred on the scalp, face and trunk of a 37-year-old. This report describes the clinical, histologic and immunochemical findings of xanthogranuloma that mimic malignant melanoma. (Korean J Dermatol 2007;45(11):1191∼1194)
김인태(Kim Intai),한정우(Han Jungwoo),윤세웅(Yun Seung),박두희(Park Duhee) 한국지반환경공학회 2008 한국지반환경공학회논문집 Vol.9 No.4
지진파는 진원지로부터 지표면으로 전파되는 과정에서 전파경로와 부지증폭정도의 차이, 그리고 비균질한 지반에서의 지진파 산란 등으로 인하여 공간적으로 변이하게 된다. 공간적으로 변이하는 지진파는 교량과 터널과 같이 종단방향 길이가 긴 구조물에 큰 영향을 미칠 수 있다. 지진파의 공간적 변이성이 교량에 미치는 영향에 대해서는 잘 알려져 있지만 터널에 미치는 영향에 대해서는 체계적인 연구가 수행된 바 없다. 본 연구에서는 공간적으로 변이하는 지진파에 대한 터널의 응답을 예측하기 위한 새로운 기법을 개발하였다. 개발된 기법의 핵심은 이격거리별 계산된 공간적으로 변이하는 지진파의 시간이력으로부터 생성되는 종단방향 변위 주상도이다. 종단방향 변위 주상도는 일련의 3차원 유사정적 유한요소해석을 수행하는데 사용되었다. 해석결과, 공간적으로 변이하는 지진파는 터널에 종단방향 휨을 유발하며 터널 라이닝에 큰 축력이 발생할 수 있는 것으로 나타났다. 이는 특히 지반의 특성이 변이하는 경계면에서 영향이 큰 것으로 나타났다. Various components including wave scattering, wave passage, and site amplification effects cause the ground motion to vary spatially. The spatially varying ground motion can significantly influence the dynamic response of longitudinal structures such as bridges and tunnels. While its effect on bridges has been extensively studied, there is a lack of study on its effect on underground tunnels. This paper develops a new procedure for simulating the tunnel response under spatially varying ground motion. The procedure utilizes the longitudinal displacement profile, which is developed from spatially variable ground motion time histories. The longitudinal displacement profile is used to perform a series of pseudo-static three dimensional finite element analyses. Results of the analyses show that the spatially variable ground motion cause longitudinal bending of the tunnel and can induce substantial axial stress on the tunnel lining. The effect can be significant at boundaries at which the material properties of the ground change in the longitudinal direction.