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질소와 산소의 혼합물에서 이상흡착용액이론 및 근사계산법에 의한 흡착평형의 예측
박경찬,서성섭 ( Kyung Chan Park,Sung Sup Suh ) 한국공업화학회 1995 공업화학 Vol.6 No.6
기상과 평형에 있는 흡착질상을 열역학적 이상용액으로 취급하여, 기체혼합물에 대해 순수성분의 등온흡착식으로부터 기상의 조성과 흡착질상 사이의 흡착관계식을 유도하는 이상흡착용액이론(ideal adsorbed solution theory, IAST)을 질소와 산소의 혼합물에 적용하여 평형흡착량을 예측하고 혼합기체에 대한 실험으로 구한 흡착량과 비교하였다. Molecular sieve 5A의 흡착등온선은 정적흡착실험법으로 측정하였다. IAST로부터 혼합물의 흡착량을 예측하는 데는 간단한 Langmuir isotherm을 사용해도 반복계산이 반드시 필요하다. 이러한 반복계산과정을 생략하기 위해 제안된 근사계산법들을 이용하면, 예측값들은 IAST로부터 얻은 값과 큰 차이를 보이지 않으면서도, 상대적으로 간단하게 혼합물의 흡착량을 구할 수 있음을 알 수 있었다. 세 가지 근사계산법들 중에서 Pade′approximation과 Taylor-series expansion을 이용하여 얻은 결과값들은 IAST로 얻은 결과와 거의 일치하였다. Adsorbed amounts from the mixture of nitrogen and oxygen on molecular sieve 5A were measured by static adsorption experiment. The experimental results were compared with the theoretical results calculated by ideal adsorbed solution theory(IAST) which treats the mixed adsorbate as an ideal solution in equilibrium with the gas phase and allows prediction of multicomponent equilibria from single-component isotherms alone. The equations resulting from IAST, however, must be solved iteratively even for the simple Langmuir isotherm. Three approximation methods were suggested in order to alleviate mathematical difficulties in the prediction of multicomponent equilibria, while making little or no loss in the accuracy of the calculation. Among the approximation methods, Pade′approximation and Taylor-series expansion methods gave excellent agreement with the exact results calculated by IAST.
김태홍(Tae Heung Kim),박경찬(Kyung Chan Park),김정애(Jeong Aee Kim),김선훈(Seon Hoon Kim),이유신(Yoo Shin Lee),안효섭(Hyo Seop Ahn) 대한피부과학회 1990 대한피부과학회지 Vol.28 No.4
We described the clinical manifestation of herpes zoster in thirteen children with underlying malignancies. Among the associated malignancies, hematologic malignancy including acute lymphotytic leukemia was the commonest and CNS tumors were also frequently associated. Pain was mild, and some showed high fever and abnormal liver function test results. Recurrent attacks were observed in 3 cases(23%). Thoracic segment and trigeminal nerve were commonly affected. In most cases, herpes zoster developed within two years after the diagnosis of the malignancy. (Kor J Dermatol 28(4): 441 444, 1990)
이주흥(Joo Heung Ree),박경찬(Kyung Chan Park),이유신(Yoo Shin Lee) 대한피부과학회 1989 대한피부과학회지 Vol.27 No.6
We report four cases of hyalinosis cutis et mucosae. They developed hosrseness in their infancy and all had past history of frequent skin infections with accompanying varioliform scars. On physical examination, all the patients had beaded papules along their eyelid margins, hoarseness, varioliform scars and various skin and mucous membrane infiltrations. Pathologic examinations performed on skin infiltrations and eyelid papules revealed diastase resistant periodic acid Schiff positive materials deposited mainly in upper dermis. We have given three of four patients 1g/day of dimethyl sulphoxide from 6 to 12 months with no significant side effects nor remarkable clinical improvement.
면역억제제 투여 환자에서 발생한 비전형적 소견의 첨규콘딜롬
최주현(Joo Hyun Choi),조미경(Mi Kyung Cho),전덕규(Duk Kyu Chun),박경찬(Kyoung Chan Park) 대한피부과학회 1989 대한피부과학회지 Vol.27 No.6
Condyloma acuminatum is a common viral disease which is transmitted by sexual intercourse. We experienced a case of condyloma acuminatum occurring in a patient of systemic lupus erythematosus who has been treated with various immunosuppressive agents for 10 years. This condylorna acuminatum was unusual in that it was very rapidly growing, recurrent and reluctant to various treatrnents. We investigated the type of human papillomavirus by Southern blot hybridization and schieved partial improvement by bleomycin intralesional injection together with 5-FU topical application.
비전형적 성기 사마귀에서의 Human Papillomavirus DNA 검색에 대한 연구
최지호(Jee Ho Choi),성경제(Kyung Jeh Sung),이미우(Mi Woo Lee),고재경(Jai Kyoung Koh),유희준(Hee Joon Yu),이승철(Seung Chul Lee),박경찬(Kyoung Chan Park) 대한피부과학회 1991 大韓皮膚科學會誌 Vol.29 No.3
In situ hybridization using radioactively labeled(S) and nonradioactively labeled probes was performed to detect HPV DNA and to compare the sensitivity of two probes in 17 patients with genital warts showing atypical manifestations. HPV 6/ll was found in 100%(3/3) of the flat type, 50%(2/4) of the pigmented type and 66.7%(2/3) of the flat and pigmented type (except bowenoid papulosis) and 66.7%(2/3) of the large extensive type. However HPV 16/18 was not found at all. In bowenaid papulosis, HPV 16/18 was detected in 25% (1/4) of the cases but HPV 6/11 was negative in all cases. There was no significant difference between the sensitivity of radioactiue and nonradioactive probes. HPV 6/11 was positive in the giant condyloma acuminata complicated with squamous cell carcinoma. (Kor J Derrnatol 20(3): 377 383 .1901)
조현주 ( Hyun Joo Cho ),이현경 ( Hyun Kyung Lee ),김동석 ( Dong Seok Kim ),박경찬 ( Kyoung Chan Park ),장민열 ( Min Youl Chang ),김진준 ( Jin Jun Kim ),이천구 ( Cheon Koo Lee ),오달균 ( Dahl Kyun Oh ) 한국조직공학·재생의학회 2007 조직공학과 재생의학 Vol.4 No.3
In this study, the effects of hGH were analyzed by using living skin equivalents(LSEs) models. In monolayer culture of keratinocytes, hGH was not cytotoxic to cells in the range of 0.0005~0.5%. However, hGH inhibit keratinocytes proliferation in all tested concentrations. In fibroblasts, hGH was slightly toxic to fibroblasts at 0.5% concentration. However, hGH stimulate fibroblasts proliferation at the concentrations between 0.005~0.05%. These results showed that hGH is not cytotoxic to epidermal cells up to 0.5% concentration. But, it can be said that different pathways are mediated by hGH in keratinocytes and fibroblasts. Then, the effects of hGH were tested using LSE models. For this study, 0.05% concentration of hGH was used. It is thought that epidermis in LSE is hyperproliferative. Thus, parakeratotic epidermis is observed and granular layer is not well formed. To suppress the hyperproliferative potential of LSEs, high concentration of rh-EGF(10 ng/ml) was usually added in the preparation of LSEs. In this study, 0.05% hGH was added and epidermal thickness of hGH treated model looked slightly thinner than that of rh-EGF models. Interestingly, parakeratosis was not observed in both rh-EGF and hGH models. Thus, it can be said that rh-EGF and hGH can control the hyper-proliferation of keratinocytes in the reconstruction of SEs. In the reconstruction of epidermis, basement membrane formation is also very important. Results showed that α6 integrin and ß1 integrin expression is elevated in hGH models. Furthermore, involucrin expression was evident at upper epidermis. However, expression of PCNA and p63 was not different compared to other models. Results suggest that hGH promote the formation of basement membrane and differentiation.
조광현 ( Kwang Hyun Cho ),이미경 ( Mi Kyung Lee ),조성진 ( Sung Jin Jo ),김규한 ( Kyu Han Kim ),박경찬 ( Kyoung Chan Park ),은희철 ( Hee Chul Eun ),정진호 ( Jin Ho Chung ) 대한피부과학회 2003 대한피부과학회지 Vol.41 No.6
N/A Background : In white people, a distinction between intrinsic aging and photoaging has been well documented in histologic studies. However, no histological studies to date have attempted to announce morphological changes with photoaged skin of Koreans. Objective : Our purpose was to compare the histologic change with advancing age between exposed skin and nonexposed skin of Koreans. Methods : Twenty-one male volunteers between 20 and 80 years of age were recruited. The histochemical and immunhistochemical studies were performed with the skin obtained from face and buttock. Results : 1. With advancing age, there was a decreasing tendency in the epidermal thickness. However, there was no difference between exposed skin and non-exposed skin. 2. Density of dopa-positive melanocytes was much higher in the face than in the buttock at all ages. Decline of melanocyte density with advancing age is not prominent in the facial skin. 3. In the facial skin, accumulation of thickened degraded elastic fibers and a decrease in collagen fibers are evident with advancing age. In the facial skin, increase of acid mucopolysaccharides is also found with advancing age. Conclusion : Koreans, the histologic changes in the skin with photoaging are distinct from those in the skin with intrinsic aging. (Korean J Dermatol 2003;41(6) : 754~760)