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계기용 밸브 재질의 검증 인장시험에 의한 사용적합성 평가
신인환(In Hwan Shin),박치용(Chi Yong Park) 한국압력기기공학회 2021 한국압력기기공학회 논문집 Vol.17 No.1
In this paper, an application example for fitness-for-service of material is shown. A kind of instrument valve is made of austenitic stainless steel fabricated by the cold working process. The tensile strength of the cold worked austenitic stainless steel has to be limited under 90 ksi to prevent the stress corrosion cracking in power plants. In industrial fields, tensile strengths of some materials were discovered to be over the regulation requirements in a certified material test report (CMTR). Owner’s verification tests were performed to compare with that in a CMTR and to check the appropriateness. It is found that, in the case of verification test under the required test speed, valve materials could be used in the field. Although it is only one application sample of material check process in the power generation site, this case study could show an importance of basic experimental technology in academia and research circles.
충남 서부지역 돈군에서 분리된 Bordetella bronchiseptica의 성상에 대한 연구
박세종 ( Se Jong Park ),안식욱 ( Shin Uk An ),신인환 ( In Hwan Shin ),정태수 ( Tae Su Chung ),전무형 ( Moo Hyung Jun ) 한국가축위생학회 1995 韓國家畜衛生學會誌 Vol.18 No.2
During 2 years from Octorber 1992 to April 1994, prevalence of general respiratory diseases and atrophic rhinitis in the pig herds located in the Western Chungnam was investigated, and isolation of B. bronchiseptica was attempted for the pigs manifested with the clinical signs of atrophic rhinitis(AR). The isolates were characterized and identified in aspects of biochemical properties, antigenicity, drug sensitivity and pathogenicity. The results obtained through the experiments are summarized as follows; 1. During 2 years of investigation, the overall prevalence of the general respiratory diseases in the pig herds in Western Chungnam was 35.3%, consisting of 35.1% in the pig farms and 38.8% in a slaughter house. The prevalence by age groups accounts for 9.2% in adults, 44.7% in rearings and 25.3% in sucklings. By farm size, The highest prevalence of 56.5% was observed in the smallest farm with 1 to 200 heads. 2. The prevalence of clinical cases of artrophic rhinitis was recorded by 12.7% in the group that is the sows and piglets vaccinated, 28.9% in the group that is the sows only vaccinated and 39.8% in the group of the non-vaccinated groups. In the slaughter house, 53(24.8%) of 214 pigs examined exhibit the AR lesions. 3. A total of 189 strains of B. bronchiseptica were isolated from the pig herds. Isolation rates were 12.6% in the group that is the sows and piglets vaccinated, 34.1% in the group that is the sows only vaccinated and 45.7% in the group of the non-vaccinated groups. Isolation rate in the specimen from the slaughter house was 93(43.5%) of 214 pigs examined. Of the AR-non-vaccinated group, the piglets aged between 61 to 90 days revealed the highest isolation rate of 58.5%. 4. The titers of antibody against B. bronchiseptica were measured by tube agglutination test. The group that is the sow and piglet-vaccinated showed the highest titer of 640-2,560 in sow and 640->5,120 in piglet. The group that is the SOWS only-vaccinated revealed 640-2,560 in sows and 640-1,280 in piglets. Both of the vaccinated groups showed 100% positive reaction. The group of the non-vaccinated showed relatively lower titer of 0-1,280 in both of sows and piglets. The positive rate of the sera obtained from the slaughter house was 53.3% with the antibody titer of 0-1,280. 5. Biochemical and serological properities of 189 isolates were very similar to those of the reference B. bronchiseptical phase I type, indicating that most of isolates are B. bronchiseptica phase I type. 6. In antimicrobial drug susceptibility, 87.3% of 189 isolates was susceptible to chloramphenicol, 79.9%, to amikacin, 64.6%, to cephalothin and less than 35.4% to others. 7. In agar-gel immunodiffusion and SDS-PAGE analysis, the isolates presented the identical antigenicity and protein profiles to the reference standard strains. 8. The whole cells and bacterial filtrates of the isolates were inoculated to guinea pigs and mice. The isolates showed the high pathogenicity and dermonecrotoxiciy.
신인환(Shin In-Hwan),유호천(Yoo Ho-Chun) 한국태양에너지학회 2011 한국태양에너지학회 학술대회논문집 Vol.2011 No.4
This paper deals with the free cooling system of express bus using natural energy source in order to improve the room air quality and save cooling energy. In an express bus, there are may passengers in unit area, requiring the improvement of air quality and giving higher energy saving efficiency. Particularly, the express buses running fast make it easy to take in outdoor air at a flow rate controllable with a damper mechanism. This paper proposes the analysis on the air flow achieved by a damper controlled vertically and horizontally in order not to deteriorate the ride comfort of the passengers
오스테나이트계 스테인리스강 용접재(ER347)의 파괴인성에 미치는 열화 영향 평가
신인환(In Hwan Shin),이호중(Ho Jung Lee),박상규(Sang Kyu Park) 대한기계학회 2019 大韓機械學會論文集A Vol.43 No.3
본 연구에서는 ER347 용접재의 파괴인성에 미치는 열화 영향을 평가하기 위하여 GTAW 방식으로 덧살올림 용접한 블록에 대한 인장 및 파괴인성시험을 수행하였다. 열화 후 ER347 용접부의 강도가 열화 전에 비해 약 10 % 증가하였으나 5,000 시간 이후에는 강도 변화가 둔화되었다. 그러나 파괴인성은 열화시간에 반비례하여 꾸준히 감소하였다. 시험결과를 토대로 볼 때 ER347 용접재의 열화 영향을 정확히 평가하기 위해서는 강도 뿐 만 아니라 파괴인성도 함께 고려해야 할 것으로 보인다. 또한 ER347 용접재의 파괴인성이 주조스테인리스강, E308 및 ER316 용접재에 비해 상대적으로 높게 나타났는데 이에 대한 원인은 델타-페라이트의 함량, Nb 성분으로 보이며 이에 관한 후속 연구를 수행할 예정이다. In this study, we evaluated the thermal aging effect of ER347 welds by performing tensile and fracture toughness tests for welding blocks made by GTAW and the build-up welding method. The strength of the aged welds increased by approximately 10% compared to that of the as-welded status, and the variation in strength slowed after 5,000 hours. However, the fracture toughness of welds decreased gradually in inverse proportion over time. The test results suggest that fracture toughness, as well as strength, should be considered to accurately evaluate the thermal aging effect. Furthermore, the fracture toughness of ER347 welds was determined to be higher than that of cast stainless steel, E308 and ER316 welds. This may be occurring due to the δ-ferrite contents and Nb component. A follow-up study will be conducted on this issue.
맞대기 용접부가 존재하는 SA312 Tp304L 배관의 4점 굽힘시험을 통한 J-R 선도 평가
신인환(In Hwan Shin),이경수(Kyoung Soo Lee),석창성(Chang Sung Seok) 대한기계학회 2018 大韓機械學會論文集A Vol.42 No.11
본 연구에서는 시험편의 보수성을 정량적으로 평가하기 위하여 맞대기 용접된 오스테나이트계 스테인리스강(SA312 Tp304L) 배관을 대상으로 표준시험편을 이용한 파괴인성시험과 배관의 4점 굽힘시험을 수행하고 J-R 선도를 비교하였다. 우선 4점 굽힘시험 결과로부터 맞대기 용접부에서의 최대하중 지지능력이 모재와 유사함을 알 수 있었으며, 실제 배관의 J-R 선도에 비해 낮게 평가된 표준시험편으로 구한 용접부의 J-R 선도를 배관의 LBB 평가에 직접 적용하는 것은 매우 보수적임을 알 수 있었다. 따라서 배관의 LBB 안전여유도를 정확히 평가하기 위해서는 모재와 용접부의 인장물성과 파괴인성 뿐만 아니라 실제 배관의 파괴특성을 모두 포함한 추가적인 안전여유도의 평가 또한 고려되어야 할 것이다. In this study, fracture toughness tests using standard specimens proposed in the ASTM E1820, and 4-point bending tests using austenitic stainless steel pipes with butt-welding joints are performed to quantitatively estimate specimen conservation. First, the maximum load-carrying capacity of a butt welding joint is similar to that of the substrate of a pipe considering the results of 4-point bending tests. In addition, it is very conservative to determine the leak-before-break (LBB) safety margin of a pipe using the standard specimen directly because the value of the J-R curve obtained for the butt-welding joint using the specimen is smaller than that of the J-R curve for the actual pipe. Therefore, the estimation of an additional safety margin should be considered to determine accurately the LBB safety margin of a pipe considering not only the tensile properties and fracture toughness for both the base metal and butt-welding joint of the pipe but also fracture characteristics of the actual pipe.
신인환(Shin In-Hwan),강현구(Kang hun-Gu),이선동(Lee Sun-Dong),유호천(Yoo Ho-Chun) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.11
Energy conservation and greenhouse gas reduction have been increasingly important amidst climate change. This study thus is intended to evaluate the energy-saving effect by natural cooling. For indoor space, the temperature requiring cooling was estimated at 26℃ as a result of simulation using typical meteorological year weather data. It's aimed at achieving cooling effect by inducing natural ventilation during the time when ambient temperature is 24℃ or below. Inducing the air outside also improved the indoor air quality by increasing the ventilation. Given the air inside bus was relatively inferior among the various indoor environments while it's structurally easy to induce the air outside, analysis of energy conservation effect by cooling load was conducted inside express bus. When a bus runs at 100㎞/h, the velocity of airflow coming through the vent was 1.65m/s on average with the ventilation of 4,716㎥/h.