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홍용주,강은석,지명진,오태근,궁성수,전현정,최형진 대한내분비학회 2015 Endocrinology and metabolism Vol.30 No.4
Background: Type 2 diabetes is one of the most common diseases with devastating complications. However, genetic susceptibility of diabetic complications has not been clarified. The vitamin D endocrine system is related with calcification and lipolysis, insulin secretion, and may be associated with many complicated disease including diabetes and cardiovascular disease. Recent studies reported that single nucleotide polymorphisms of vitamin D receptor (VDR) gene were associated with diabetic complications. Methods: In present study, we evaluated the association of BsmI polymorphism of VDR with diabetic complications in Korean diabetes patients. Total of 537 type 2 diabetic subjects from the Endocrinology Clinic of Chungbuk National University Hospital were investigated. Polymerase chain reaction-restriction fragment length polymorphism was used to test the genotype and allele frequency of BsmI (rs1544410; BB, Bb, bb) polymorphisms. Results: Mean age was 62.44±10.64 years and mean disease duration was 13.65±7.39 years. Patients with B allele (BB or Bb) was significantly associated with lower risk of diabetic retinopathy (severe non-proliferative diabetic retinopathy or proliferative retinopathy; 7.4%, 5/68) compared with patients without B allele (bb; 17.3%, 81/469; P=0.035). This association was also significant after adjusting for hemoglobin A1c level, body mass index, age, sex, and diabetes mellitus duration, concurrent dyslipidemia and hypertension (odds ratio, 2.99; 95% confidence interval, 1.08 to 8.29; P=0.035) in logistic regression analysis. Conclusion: Our findings suggest that B allele of Bsm1 polymorphism in VDR gene is associated with lower risk of diabetic retinopathy in type 2 diabetic patients. Bsm1 genotype could be used as a susceptibility marker to predict the risk of diabetes complication.
Galvanic replacement reaction to prepare catalytic materials
홍용주,VENKATESHALU SANDHYA,정상연,Gracita M. Tomboc,조진형,박종식,이광렬 대한화학회 2023 Bulletin of the Korean Chemical Society Vol.44 No.1
Galvanic replacement reaction (GRR) has gained considerable interest as a fac- ile and versatile synthetic method for modulating compositions, morphologies, and corresponding physicochemical properties of metallic nanoparticles. Thus far, extensive knowledge of GRR on monometallic templates has been accumu- lated, backed with ample experimental data and computational modeling and validation. The GRR templates have recently been extended to other materials such as alloys, oxides, sulfides, and liquid metals. These new materials have demonstrated potential applications in electrochemical energy conversion sys- tems, which have been relatively unexplored for GRR-originated materials. In this review, the recent findings in GRR on these new template materials are introduced, pointing to the incredible versatility of the GRR methodology in diversifying the catalytic materials classes. We further discuss the remaining critical issues and future research directions of GRRs to fully exploit the poten- tial of GRR in spearheading future advances in electrocatalytic energy conver- sion and other important applications.
홍용주,고준석,김효봉,박성제,Hong, Yong-Ju,Go, Jun-Seok,Kim, Hyo-Bong,Park, Seong-Je 재료연구소 2011 機械와 材料 Vol.23 No.3
쥴톰순 냉동기는 스터링 냉동기, GM 냉동기, 스터링형 및 GM형 맥동관 냉동기 등 기계적 극저온냉동기에 비해 단순한 구조, 수 초의 급속한 냉각특성을 장점으로 중대형의 가스액화사이클 뿐만 아니라 적외선검출기의 급속냉각, 저온수술 등 다양한 분야에서 널리 사용되어지고 있다. 일반적으로 100K 이하의 작동온도 및 수 초 수준의 빠른 냉각을 요구하는 적외선검출기의 냉각을 위해서는 수 백기압 이상 고압의 질소 및 아르곤 가스를 사용하는 쥴톰슨 냉동기가 주로 사용되고 있다. 쥴톰슨 냉동기는 핀-관(fin-tube) 형태의 열교환기와 열교환기의 구조적 기반을 제공하는 멘드렐(mandrel), 쥴톰슨 노즐 등으로 구성되며, 열교환기의 열전달 성능 및 유량조절기구의 특성은 냉동기 저온부의 냉각온도, 냉각시간 및 운전시간에 큰 영향을 미친다.
주위온도조건이 스터링 극저온냉동기의 성능에 미치는 영향
홍용주,김효봉,박성제 한국초전도.저온공학회 2009 한국초전도저온공학회논문지 Vol.11 No.3
The Stirling cryocoolers have been widely used for the cooling of the infrared detector(InSb, HgCdTe, and etc.) and HTS(High Temperature Superconductor) to the cryogenic temperature. The monobloc Stirling cryocoolers with the rotary compressor are applicable to the cooling device for the compact mobile thermal imaging system, because the cryocoolers have the compact structure and light weight. The typical performance factors of the Stirling cryocooler are the cool-down time, cooling capacity at the desired temperature (80 K), the electric input power and COP. The above performance factors depend on the operating conditions such as the charging pressure of the helium gas, the thermal environment and etc.. In this study, the effects of the thermal environment (temperature of 241, 293, and 333 K) on the performance of the cryocooler were investigated by experiments. The results show the effects of the temperature of the thermal environment on the cooling capacity and input power.