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First Passage Time between Ends of a Polymer Chain
성재영,Sung, Jae-Young Korean Chemical Society 2007 대한화학회지 Vol.51 No.3
윌렘스키-픽스만(Wilehemski-Fixmann)의 사슬고분자 내 화학반응동력학 이론을 반응 그룹들 간의 배제효과를 고려하여 개선하였다. 가우스 체인 양극단 반응 모델의 반응 동력학에 대한 해석적인 표현을 얻어 이를 브라운 동력학 모의 실험결과와 비교하였다. 비교결과 본 이론의 예측이 기존 이론들의 예측 보다 모의실험 결과와 더 잘 일치하였다. We improve Wilehemski-Fixmann theory for intrachain reaction dynamics of a polymer chain by taking into account excluded volume effects between reactive groups in the polymerchain. An approximate analytic expression for the intra-chain reaction dynamics is obtained for Gaussian chain model and compared to Brownian dynamics simulation results. The results of the present theory are in a better agreement to Brownian dynamics simulation results than those calculated by previously reported theories.
작은 반응 매질에서 일어나는 촉매 반응 속도에 관한 연구
김중한,성재영,Kim, Jung-Han,Sung, Jae-Young 대한화학회 2008 대한화학회지 Vol.52 No.3
본 논문에서는 반응 매질의 부피가 촉매 반응 속도에 미치는 영향을 조사하였다. 단순하지만 정확한 모델에 대한 연구로부터 촉매 반응의 반응 속도 계수는 매질의 부피가 줄어들 수록 증가함을 알게 되었다. 평균 반응속도 상수(average reaction rate constant)는 Collins-Kimball 속도 상수의 일반화 된 형태로 얻어졌는데, 속도 상수는 부피의 효과를 보정해주는 인자를 포함하고 있다. 조사한 모델의 반응물 농도는 전통적 화학 반응론에서 예측되는 지수함수적 감소와는 상당한 차이를 보이는데 이는 기존 화학 반응속도론에서는 무시되는 반응분자 공간 분포의 비평형 확산운동(non-equilibrium diffusive dynamics)의 효과 때문이다. 반응 매질의 부피 가 유한한 점을 고려하면, 반응 시간이 충분히 오래 지났을 때, 기존의 확산지배 반응에서는 예측 되는 않는 지수 함수적 농도 감소가 얻어지는데, 그 속도 상수 역시 반응매질 크기에 의존한다. We investigate the kinetics of diffusion-influenced catalytic reactions occurring in small reaction volume. From a simple exact model study, we find that the reaction rate coefficient decreases with the size of reaction volume. The explicit expression for the average reaction rate constant is presented, which can be regarded as a generalization of well-known Collins-Kimball rate constant into the reactions occurring in a small reaction volume. It turns out that the traditional diffusion influenced reaction dynamics is followed by a single exponential relaxation phase with a rate constant dependent on the reaction volume for the catalytic reactions occurring in small reaction volumes.
하지절단 원위부에 발생한 림프부종을 동반한 우췌상 과증식증 1 예
김상태,서기석,성재영,최태식,도기승 대한피부과학회 2001 大韓皮膚科學會誌 Vol.39 No.8
Verrucous hyperplasia shows multiple warty like lesion on the amputation stump, but the pathologic findings of viral verrucae has not been discovered. A verrucous plaque on the amputation stump of the right leg was found in 31-year-old man. He had suffered from a traumatic amputation of right leg since 8 years ago. A leg prosthesis had been worn since that time. Histopathologic findings shows hyperkeratosis, acanthosis, papillomatosis, superficial dermal edema and dilated thick-walled venules oriented vertical to the skin surface. Verrucous hyperplasia was diagnosed with lymphedema on the basis of clinical and histological findings.
김상태,서기석,성재영 대한피부과학회 2001 大韓皮膚科學會誌 Vol.39 No.4
Background: Mycosis fungoides(MF) is a representative of cutaneous T cell lymphoma and progresses through clinical stages, such as initial pre-mycotic(macule or patch), plaque, and tumor stage. MF is usually thought of as a disease of old adults, but it can develop at any age, including childhood. Despite the recognition that MF may occur in pediatric patients, there is scant 1iterature regarding clinical feature, histopathologic finding and prognosis specially related to childhood onset. The purpose of this study was to examine the clinical, histopathologic and follow up observation of MF in children, Methods: This study has been reviewed in the clinicopathologic findings of 14 MF patients who visited the Kosin University Gospel Hospital during about 10 years from January, 1991 to June, 2000. Results: 1. Duration of cutaneous lesions was from 6 months to 10 years, with mean duration of 3.6 years. 2. The morphology of skin lesions showed various features(pityriasis lichenoides-like, hypopigmented, hyperpigmented, ichthyosis-like, inflammatory linear verrucous epidermal nevus-like). 3. Histopathologic features revealed epidermotropism, a perivascular infiltrate in all cases, haloed lymphocytes, lymphocytes aligned in the basal layer, and coarse collagen in the papillary dermis in most cases. Pautrier's microabscess was shown in 3 cases (23%). 4. In T cell receptor γ gene arrangement using PCR (polymerase chain reaction), monoclonality was detected in 13 out of 14(93%). 5. Treatment including PUVA (psoralen and UVA), UVB, topical steroid agents and calcipotriol had good a response. 6. No patients had progressed to a more advanced disease. Conclusion: MF in children of this study showed a wide variety of skin lesions. Although no case of MF in this study progressed to a more aggressive status, MF in children should be carefully followed for development of more advanced cutaneous lesions and visceral involvement.
김상태,서기석,장민수,성재영,최태식 대한피부과학회 2001 大韓皮膚科學會誌 Vol.39 No.8
We report a case of plaque stage of dermatofibrosarcoma protuberans(DFSP). A 36-year-old female visited our clinic with a 10-year history of solitary deep seated palpable erythematous plaque on right anterior chest. There was no history of previous trauma at the site of the lesion. Histopathologic findings are characterized by a flat surface, lower cellularity and slender spindle-shaped neoplastic cells diffusely infiltrated dermis and subcutaneous tissue. The slender neoplastic cells have uniform nuclei with no evidence of cytologic atypia. Especially earlier plaque or nonprotuberans stage of the DFSP could be confused with benign lesions such as dermatofibroma or diffuse neurofibroma. Because plaque areas are strongly positive for CD34, this antibody is very helpful in differentiating other benign tumors.