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김시민(Si Min Kim),박수영(Soo Young Park) 한국고분자학회 2012 폴리머 Vol.36 No.5
평판 디스플레이에 사용되는 PET 필름의 광학적 특성을 알아보기 위하여 필름 표면 굴절률, 필름 표면조도 및 필름 내부입자가 광투과율에 미치는 영향을 알아 보았다. 필름표면에 굴절률이 낮은 코팅층을 형성함에 따라 필름의 광투과율이 향상되었고, 최대의 광투과율을 가지는 코팅두께가 있음을 확인하였다. 표면 거칠기의 영향에 대해서는 표면조도를 나타내는 Ra를 입사 파장의 1/4 이하로 조절한 경우 광손실이 발생되지 않았다. 필름 내 무기입자는 입사된 광의 흡수 및 산란을 발생시켜 광손실을 증가시켰다. Poly(ethylene terephthalate) (PET) base films with high light transmittance have been used for the substrate of various functional films in the flat panel display. The effects of the reflective index of coated films, the roughness of the film surface and the content of inorganic silica particles on the light transmittance were studied in this article. Light transmittance was increased by coating a water soluble resin with a low reflective index at an optimum thickness. The roughness of the film did not affect light transmittance when the Ra of the film surface was less than a quarter of the wavelength of incident light. Inorganic silica particles decreased light transmittance due to their absorbance and scattering of the incident light.
젊은 여자에서 당뇨병과 여포성 갑상선암이 동반된 궤양성 대장염
양진수 ( Jin Su Yang ),박영숙 ( Young Sook Park ),김시민 ( Si Min Kim ),박준섭 ( Jun Sup Park ),이현석 ( Hyun Seok Lee ),전재석 ( Jae Seok Jeon ),김은경 ( Eun Kyung Kim ) 대한소화기학회 2003 대한소화기학회지 Vol.41 No.1
Ulcerative colitis is a chronic intestinal mucosal inflammatory disease of unknown etiology. Recent epidemiological and molecular studies have provided strong evidence that the inherited predisposition is important in the pathogenesis of chronic inflammatory bowel disease. The model consistent with the epidemiological data suggests that ulcerative colitis is related to polygenic diseases. We exprienced a 27-year-old woman with ulcerative colitis combined with follicular thyroid cancer and gestational diabetes mellitus. These diseases were developed consecutively within one and half year. She has a family history of thyroid disease and diabetes mellitus. We report this case with a review of literature. (Korean J Gastroenterol 2003;41:70-73)
척추 골관절염 환자에서의 골밀도와 골다공증성 척추골절의 빈도와의 관계
박준섭 ( Jun Sup Park ),주영실 ( Yeong Shil Joo ),최윤선 ( Yun Sun Choi ),정명아 ( Myeong A Cheong ),하형근 ( Hyung Keun Ha ),정인수 ( In Su Jung ),김시민 ( Si Min Kim ),김병준 ( Byoung Joon Kim ),안규정 ( Kyu Jeung Ahn ),최영길 ( 대한류마티스학회 2003 대한류마티스학회지 Vol.10 No.1
Objective: To investigate the association between bone mineral density (BMD) and osteoporotic compression fractures in radiographic spinal osteoarthritis (OA) patients. Methods: Subjects were 382 female patients (ages 45 to 85) from outpatient clinic for osteoporosis and rheumatic diseases. BMD was measured at lumbar spine and hip by dual X-ray absorptiometry (Hologic QDR 2000). The standard anteroposterior and lateral plain radiographs of thoracic and lumbar spine were taken to define spinal OA and vertebral compression fractures. Radiographic spinal OA was defined by grade of disc degeneration and facet joint degeneration. Frequency of vertebral fractures was compared between spinal OA and control patients in relation to their BMD, age, weight, body mass index (BMI) and years post menopause. Results: Higher proportion of fracture cases were observed in spinal OA patients than non-spinal OA patients (34.1%, 44/129 vs. 18.2%, 46/253, p<0.001) despite comparable mean BMD (0.836±0.152 vs. 0.834±0.185, p=0.89) and older mean age (65.8±8.5 vs. 57.8±10.3, p<0.001). In subjects of ages from 65 to 74, spinal OA patients showed significantly higher BMD than non-spinal OA patients (0.784±0.125 vs. 0.719±0.119, p=0.007), but the frequency of fractures seems to be higher than that of non-spinal OA patients (44.9%, 22/50 patients vs. 34%, 19/55 patients, p=0.58). When all study subjects were stratified according to their spine BMD (normal, osteopenia, and osteoporosis), significantly higher proportion of vertebral compression fractures was noted in spinal OA than non-spinal OA patients in osteopenia group (38.5% vs. 13.5%, p<0.001). Conclusion: Higher BMD does not seem to be translated directly into decreased risk of osteoporotic compression fractures in spinal OA patients. Careful assessment of risk factors for osteoporotic fractures and newer methods for assessing bone strength in this group of patients are needed.