http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
스터링 냉동기의 선헝압축기 운전특성에 관한 수치해석적 연구
홍용주,박성제,김효봉,염한길,최영돈 한국초전도저온공학회 2002 한국초전도저온공학회논문지 Vol.4 No.2
The purpose of this study is to analyze the charging gas effect on the resonance and performance characteristics of the linear compressor for small scale FPFD Stirling refrigerator. To ensure high performance of FPFD type Stirling refrigerator, the operating frequency of the refrigerator should be around the natural frequency of compressor. The gas spring effect which is induced from Pressure change in cylinder due to motion of pistons has significant effect on the natural frequency of the compressor. The numerical results show the linear compressor has high natural frequency when the charging pressure of working fluid is high and the stroke of compressor, current, input power and efficiency of compressor were shown with different operating conditions.
특집:에너지플랜트 및 핵심기자재 기술 - 가스액화플랜트기술
홍용주,고준석,김효봉,박성제,Hong, Yong-Ju,Go, Jun-Seok,Kim, Hyo-Bong,Park, Seong-Je 재료연구소 2012 機械와 材料 Vol.24 No.1
가스액화플랜트는 질소, 산소, 헬륨 등 고순도의 가스를 효율적으로 저장 및 운송을 위해 가스를 액체로 변환하는 플랜트로, 대표적인 플랜트로는 질소, 산소, 아르곤 등의 가스를 생산하는 공기분리플랜트, 헬륨액화플랜트, 수소액화플랜트, 천연가스액화플랜트 등이 있다. 질소, 산소, 수소 등의 가스는 산업의 전반적인 분야에서 널리 사용되고 있으며, 국내의 경우 철강, 반도체, 디스플레이제조산업 등 가스 다소비 분야의 비약적인 발전에 따라 급격하게 수요가 증가하고 있는 상황이다. 대용량의 가스액화플랜트는 원료로부터 불순물을 제거하고, 팽창 또는 열교환 과정을 통해 가스를 액체로 변환하는 극저온기술로 주로 구성되며, 이와 같은 과정은 압축기, 열교환기, 증류탑, 팽창터빈, 콜드박스 등의 구성요소에 의해 구현된다. 따라서 가스액화플랜트에서 효율적인 극저온의 생성 및 유지는 플랜트의 경제성 제고를 위해 핵심적인 요소이다.
홍용주,고준석,김효봉,박성제 한국초전도.저온공학회 2016 한국초전도저온공학회논문지 Vol.18 No.3
An integral crank driven Stirling cryocooler is solidly based on concepts of direct IR detector mounting on the cryocooler’s coldfinger, and the integral construction of the cryocooler and Dewar envelope. Performance factors of the cryocooler depend onoperating conditions of the cryocooler such as a cyclic mean pressure of the working fluid, a rotational speed of driving mechanism,a thermal environment, a targeted operation temperature and etc.. At given charging condition of helium gas, the cyclic meanpressure of helium gas in the cryocooler changes with temperatures of the cold end and the environment. In this study, effects of thecyclic mean pressure of helium gas on performances of the Stirling cryocooler were investigated by numerical analyses using theSage software. The simulation model takes into account thermodynamic losses due to an inefficiency of regenerator, a pressuredrop, a shuttle heat transfer and solid conductions. Simulations are performed for the performance variation according to the cyclicmean pressure induced by the temperature of the cold end and the environment. This paper presents P-V works in the compressionand expansion space, cooling capacity, contribution of losses in the expansion space.
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.