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PVT 측정을 통한 비결정 고분자 ABS와 SAN의 압축률과 체적팽창 연구
강성욱,김성훈,Kang, Seong-Wook,Kim, Seong-Hun 한국섬유공학회 2007 한국섬유공학회지 Vol.44 No.5
The specific volume change of polymer occurs to various reactions of mechanical stress, chemical reaction, glass transition and crystallization and so on. In regular state, the specific volume of material as function of temperature and pressure is changed. The experimental and theoretical equations of state (EOS) are Tait equation and Simha-Somcynsky equation for amorphous polymer and Simha-Jain theory for crystalline polymer. This study carried out measurement of the specific volume as function of temperature and pressure using Gnomix pressure-volume-temperature (PVT) and the measured data were fitted two domain Tait equation. These results that the difference of the measured and calculated value were almost same less than 0.1% and 10 parameters which were obtained Tait fitting use to calculate compressibility and volumetric expansivity of amorphous polymers. The used ABS resins were same butadiene rubber content at 16 wt% but they had different rubber size. ABS1 consisted of only one rubber size and ABS2 consisted of two rubber sizes. The compressibility and volumetric expansivity of ABS1 was higher than those of BS2. However, for the difference of volumetric expansivity between 0 and 100 MPa, ABS2 was slightly lower than ABS1.
강성욱(Seong Wook Kang),이윤종(Yun Jong Lee),차훈석(Hoon Seok Cha),김현아(Hyun Ah Kim),박명희(Myung Hee Park),오명돈(Myoung Don Oh),송영욱(Yeung Wook Song),최강원(Kang Won Choi),이은봉(Eun Bong Lee),한창완(Chang Wan Han),백한주(Han J 대한내과학회 1999 대한내과학회지 Vol.57 No.6
Background : Systemic sclerosis (scleroderma) is a connective tissue disorder of unknown etiology characterized by fibrosis of the skin and internal organs. It is remarkably heterogeneous in initial presentations and internal organ involvement. Limited and diffuse cutaneous subsets of systemic sclerosis (SSc) are known to be different in clinical and laboratory features. The aim of the present study was to determine the clinical characteristics of systemic sclerosis in Koreans. Methods : Fifty-six patients with systemic sclerosis at the Rheumatology Clinic of Seoul National University Hospital were studied for age, sex, symptoms, signs, and laboratory results. The differences in clinical and laboratory features between limited and diffuse cutaneous subsets were investigated. Results : The mean age at diagnosis of 56 patients (male:female=1:4.6) was 42.4 years (range 11-72 years). The patients consisted of 30 limited and 26 diffuse cutaneous SSc. Cutaneous involvement was as follows: sclerodactyly (100%), Raynaud's phenomenon (94.6%), digital pitting scar (66.1%), subcutaneous calcinosis (1.8%). In musculoskeletal system, 25 cases (46.3%) developed arthralgia/arthritis, 14 cases (25.9%) myalgia. In gastrointestinal system, esophagus was affected in 11 cases (20.7%). Respiratory involvement consisted of interstitial lung disease (24 cases, 43.7%) and pulmonary hypertension (2 cases, 3.6%). Total skin score and functional vital capacity showed significant negative correlation (p<0.05). Cardiovascular involvement consisted of congestive heart failure (3 cases, 5.5%) and pericardial effusion (1 case, 1.8%). Azotemia was found in one patient (1.8%). Antinuclear antibody was positive in 53 cases (94.6%) and anticentromere antibody 2 cases (3.6%). Anti-Scl 70 antibody was positive in 46.4% of all patients, 40.0% of limited scleroderma and 53.8% of diffuse scleroderma. When comparing clinical features between limited and diffuse cutaneous subsets, musculoskeletal involvement was more common in limited scleroderma. Conclusion : Systemic sclerosis in Koreans showed various systemic and organ involvement, musculoskeletal system, lung and esophagus being commonly affected. There was no significant difference between limited and diffuse scleroderma in clinical features except musculoskeletal involvement. Investigation of major internal organs, especially lung and esophagus, is needed, regardless of cutaneous subsets in systemic sclerosis. (Korean J Med 57:979-987, 1999)
강성욱 ( Seong Wook Kang ),신기철 ( Ki Chyul Shin ),이윤종 ( Yun Jong Lee ),이은봉 ( Eun Bong Lee ),백한주 ( Han Joo Baek ),김현아 ( Hyun Ah Kim ),송영욱 ( Yeong Wook Song ) 대한류마티스학회 1999 대한류마티스학회지 Vol.6 No.3
Objective: The predominant histopathologic lesion in Behcet`s disease is vasculitis. Thrombotic complications have been reported in approximately 10~40% of patients with Behcet`s disease, but the precise mechanisms are not known. To investigate the coagualtion abnormalities in patients with Behcet`s disease, coagulation and fibrinolytic activities were examined. Methods: Thirty-two patients with Behcet`s disease and thirty-two healthy individuals as a control group were included in the study. The presence of thrombosis and risk factors for hypercoagulability, and blood components concerning coagulation and fibrinolytic activites were evaluated. Results: Of thirty-two patients with Behcet`s disease, thrombosis was found in four patients(13%). No patient had risk factors for hypercoagulability except one with lymphoma. Levels of white blood cell count(mean±SD 8,362±2,893 vs 5,934±1,755/mm3, p<0.001), erythrocyte sedimentation rate(40.5±37.6 vs 3.3±2.73 mm/hr, p<0.001), C reactive protein(2.26±3.99 vs 1.20±0.26mg/dl, p=0.008), fibrinogen(387.7±128.5 vs 240.6±49.5mg/dl, p<0.001) and von Willebrand factor antigen(131.9±46.6 vs 105.2±1.75%, p=0.008) were significantly higher in patients with Behcet`s disease compared with controls. The level of fibrinogen correlated with erythrocyte sedimentation rate(r=0.721, p<0.001) and C reactive protein (r=0.454, p=0.018). High density lipoprotein(HDL) cholesterol(46.6±12.7 vs 65.5±16.1mg/dl, p<0.001), apolipoprotein A-1(118.8±24.7 vs 134.6±18.5mg/dl, p=0.018) and antithrombin III (92.8±16.7 vs 106.3±14.7%, p=0.004) were significantly lower in patients with Behcet`s disease. No differences were observed in lipoprotein(a), plasminogen, protein C, and protein S activities. Activated protein C(APC) resistance was not observed in any patients with Behcet`s disease. Lupus anticoagulant was positive in four patients(13%). one of whom had deep vein thrombosis. Antiphospholipid antibody was found in one patient(3%), but thrombosis was not found. Conclusions: Significantly higher level of von Willebrand factor antigen was observed in Behcet`s disease, which suggested injury of vascular endothelium. Levels of HDL cholesterol, apolipoprotein A-1 and antithrombin III were decreased in Behcet`s disease. APC resistance was not found.
강성욱 ( Seong Wook Kang ) 대한류마티스학회 2010 대한류마티스학회지 Vol.17 No.1
Vitamins and their metabolites are essential for many physiological processes including immune response. In addition to regulating calcium homeostasis, vitamin D exerts various effects on cells of the immune system, such as macrophages, dendritic cells as well as, B and T cells. Low vitamin D levels are found in patients with autoimmune diseases, which suggest a potential role of vitamin D in autoimmunity. In this review, we discuss the roles of vitamin D in modulating immune responses and the clinical potential of vitamin D metabolites for preventing and treating inflammatory and autoimmune diseases.
국내 밀 집단의 출수일수, 분얼수 및 수량 관련 표지인자 평가
조성우(Seong Woo Cho),강택규(Taek Gyu Kang),강성욱(Seong Wook Kang),강천식(Chon Sik Kang),박철수(Chul Soo Park) 한국육종학회 2018 한국육종학회지 Vol.50 No.3
Molecular markers of doubled-haploid (DH) and long spike Korean wheat cultivar populations were evaluated to improve the yield potential of Korean wheat breeding programs by improving the tiller numbers. In Korean wheat cultivars, the tiller number was affected more by vernalization (Vrn) and photoperiod (Ppd) than by tiller inhibition gene (tin) and fertile tiller inhibition gene (ftin). Also, it was negatively correlated with the yield. In DH lines, the tiller number was significantly affected by neither the tiller inhibition genes nor Vrn and Ppd. Additionally, it was not significantly correlated with the yield. However, the adaptability of both SSR markers, Xgpw2206 and Xgwm247, was higher in the DH lines than in the other populations. In the long spike population, the tiller number differed according to the Ppd-D1 allele, affecting the yield. In this study, genes and molecular markers related to the tiller number, as described in previous studies, might be difficult to use to evaluate the tiller number and yield of the Korean wheat population. Hence, continuous study is necessary to develop molecular markers suitable for improving the tiller number and yield of Korean wheat cultivars.