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페놀계 산화방지제에 의한 비결정성 올레핀 수지의 황변 거동
김시용(Si Yong Kim),김호겸(Ho Gyum Kim),박상철(Sang Cheol Park),민경은(Kyung Eun Min) 한국고분자학회 2013 폴리머 Vol.37 No.2
페놀계 산화방지제는 가공 및 사용 시 열분해를 방지함으로써 뛰어난 열 안정성을 제공하는 대표적인 1차 산화방지제이다. 그러나 NOx 가스를 포함한 특정 환경에 의해 황변이 일어나기 쉽기 때문에 2차 산화방지제를 추가로 도입하여 시너지효과를 기대하는 경우가 많다. 열에 취약한 비결정성 폴리알파올레핀 수지(APAO)에 여러 가지 페놀계 1차 및 2차 산화방지제를 도입하여 황변 여부를 조사한 결과 2차 산화방지제의 함량이 증가할수록 황변이 줄어들었으며 BHT와 같은 단순 구조의 폐놀계 산화방지제보다 긴 알킬 사슬을 도입시켜 입체장애효과를 증대시킨 산화방지제가 2차 산화방지제와의 시너지 효과가 더 큰 것으로 확인되었다. Phenolic antioxidants are effective stabilizers that provide excellent long-term heat stability by preventing thermo-oxidative degradation during processing and service life. However, under a selected set of circumstances, certain types of phenolics have been susceptible to discoloration due to prolonged storage in an environment containing oxides of nitrogen. It is investigated that the effect of addition of secondary antioxidant and chemical structure of primary antioxidant on discoloration of amorphous poly-α-olefin (APAO), which is especially prone to be decomposed in high processing temperature. From the result, it is concluded that a higher level of steric hindrance of phenolic antioxidant provided by long alkyl chain allows a more enhanced synergic effect with secondary antioxidant.
신현민,김시용,이상진,한기택,김정원 ( Hyun Min Shin,Si Yong Kim,Sang Chin Lee,Ki Taek Han,Chung Won Kim ) 대한피부과학회 1997 대한피부과학회지 Vol.35 No.2
Dermatofibrosarcoma protuberans(DFSP) is a rare, distinctive cutaneous tumor, which consists of spindle shaped ceils arranged in densely packed interlacing bundles with the storiform or cartwheel pattern. Histologically, it resembles deep growing dermatofibroma, nodular fasciitis, neurofibroma and neural sheath tumors. DFSP is one of t.he connective tissue tumors which is difficult. to diagnose histologically as well as clinically. Recently, the immunochemical staining with a monoclonal antibody to CD34 is reported to give assistance in the clear differential diagnosis of DFSP from other fibrous or neural tumors. Herein, three cases of DFSP were stained by immunohistochemical staining with S-100 protein, vimentin, factor VIII and anti-CD34 antibody in order to assess the use of anti-CD34 in the differential diagnosis of DFSP. (Kor J Dermatol 1997;35(2): 327-332)
kV Cone-beam CT를 사용한 치료준비에서 재구성 영상의 품질이 표적 위치 결정에 미치는 영향
오승종,김시용,서태석,Oh, Seung-Jong,Kim, Si-Yong,Suh, Tae-Suk 한국의학물리학회 2006 의학물리 Vol.17 No.4
kV cone-beam CT (CBCT)가 결합된 선형가속기의 등장으로 더욱 정확한 영상유도 방사선치료(Image-guided radiation therapy, IGRT)가 가능해졌다. IGRT는 영상장비를 이용해 표적의 이동을 보정할 수 있는 방사선치료기술로, CBCT를 이용한 IGRT의 경우 내부 장기의 정보를 바탕으로 병변의 이동을 정확히 알 수 있다. 내부 장기의 정보를 얻기 위해서는 방사선이 조사되기 바로 전에 환자의 CBCT 영상을 획득하여 치료계획 시 사용한 모의치료 CT영상과 정합을 수행하게 된다. 본 연구에서는 CBCT 영상의 재구성 품질에 따른 정합결과를 비교해 보았다. 6명의 환자로부터 총 56개의 CBCT 투과 정보를 획득하여 분석한 결과, 평행이동벡터의 차가 1 mm를 초과하는 경우는 단 3개에 불과하였다. 회전이동의 경우, x, y, z, 세 축을 모두 고려하였으며, 그 결과 총 168 ($56{\times}3$)개에서 단 3개만이 $1^{\circ}$ 이상의 차이를 나타냈다. The advent of kV cone-beam computed tomography (CBCT) integrated with a linear accelerator allows for more accurate Image-guided radiotherapy (IGRT). IGRT is the technique that corrects target displacement based on internal body information. To do this, the CBCT Image set is acquired just before the beam is delivered and registered with the simulation CT Image set. In this study, we compare the registration results according to the CBCT's reconstruction quality (either high or medium). A total of 56 CBCT projection data from 6 patients were analyzed. The translation vector differences were within 1 mm in all but 3 cases. For rotation displacement difference, components of all three axes were considered and 3 out of 168 ($56{\times}3$ axes) cases showed more than lo of rotation differences.
김태윤,조상현,김시용,조백기,이숙영 (Tae Yoon Kim,Sang Hyun Cho,Si Yong Kim,Baik Kee Cho,Sook Young Lee) 대한피부과학회 1996 대한피부과학회지 Vol.34 No.2
Scleroderma is sclerosis of the skin characterized by the appearance of circumscribed or diffuse hard, smooth, ivory-colored anea that are immobile upon the underlying tissues and give the appearance of hide-bound skin. Several environmental factors and chemicals have been described as being able to induce systemic scleroderma and scleroderma-like diseases. A possible association between scleroderma and workers exposed to silica has been suggested by reports in the literature since the turn of the century. We report a 55-year-old man, with a history of Raynaud's phenomenon and dysphagia, who had been exposed to silica dust over fifteen years. He had a mask-like face, flexian deformity of fingers, and hyperpigmented induration on the skin of all the extremities and the trunk. Antinuclear antibodies were positive in nucleolar type. On radiologic study, streaky, mottled, and nodular increased densities were noted in the both lung fields and these findings were consistent with silicosis. Endoscopic and manometric examination of the esophagus represented scleroderrna esophagus. Histopathological findings were compatible with scleroderma. He was treated with azathioprine and nifedipine with good improvement. (Kor J Dermatol 1996;34(2): 322-325)
옻나무에 의한 알레르기성 접촉피부염과 경구복용에 의한 전신성 접촉피부염의 면역조직화학적 비교
정소희,조상현,이상진,김시용 ( So Hee Jeong,Sang Hyun Cho,Sang Chin Lee,Si Yong Kim ) 대한피부과학회 1997 대한피부과학회지 Vol.35 No.6
Background: The rhus has been known to be such a potent allergen that it causes severe contact dermatitis, and mary studies have tried to reveal the mechanism of allergic contact. dermatitis to urushiol. However, the mechanism of systemic contact dermatitis to urushiol is not, well-known, though the consumption of rhus as a health product and for desensitization is not unconmon in Korea. Objective : The purpose of this study was to evaluate the niechanism of systernic contact dermatis, and we carried out irnmunohistochemical stainings un the two strands of dermatitis (systemic arid,llergic contact dermatitis). Methods : The patients of systemir, contact dermatitis were divided into three groups by duration and severity of the illness according to the desired criteria. We perfor med immunohistor,hernical staining of the tissues from the pat.ients with anti CD4, CD8, CDla, ICAM-1, II,-ZR monoclorial antibodies. Results : 1. The results were as follows. 1. The immunohistochemical staining showed that CD8 positive cell numbers in systemic contact dermatitis(18 -L 1 0) were significantly lower than those of allergic contact der matitis(37 +- 13) ( p< 0.05). 2. The expressions of HLA-DR and ICAM-1 in the keratinocytes were not significantly different. between systemic and allergic contact derrnatitis(p>0.05). Conclusion : The result suggest that lower numbers of CDH positive T cell in systemic contact dermatitis caused a reduation in the suppressor effect to the urushiol mediated immune rection and CD8 positive T cells play an important role in systemic contact dermatitis due to rhus. (Korean J Dermatol 1997;35(6): 1052-1058)