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순환 굵은 골재와 부순 굵은 골재의 혼합비율에 따른 혼합 굵은 골재 품질특성에 관한 기초적 연구
윤상혁,이세현 한국폐기물자원순환학회 2020 한국폐기물자원순환학회지 Vol.37 No.7
The density based on the mixing ratio of recycled coarse aggregate and crushed coarse aggregate decreased as the mixingratio increased, and the absorption rate increased. Based on the mixed coarse aggregate’s quality characteristics showedthe highest performance at the mixing ratio of 20 to 80. exhibited. Furthermore, the recycled coarse aggregate satisfyingthe KS F 2527 standard can be used for ready-mixed concrete production up to 80%. The particles resulting from theincrease in the mixing ratio of recycled coarse aggregate is applicable as mixed coarse aggregate for ready-mixed concreteproduction
윤상혁 대한기계학회 1995 大韓機械學會誌 Vol.35 No.1
연사기는 섬유공정 중에서도 기본적인 제직 준비공정으로서 연사기 시장은 개발도상국의 섬유 산업 진흥과 더불어 날로 확대되고 있다. 최근 섬유산업이 요구하는 연사기의 성능은 범용성\ulcorner 효율성 및 다양한 보조기능(실잇기, 패키지교체, 왁스나 요일의 첨가 등의 기능을 자동화하는 것 등)의 구비 등이다. 연사기의 생산성은 스핀들의 회전수가 높을수록 증대되므로 고속회전체 기 술의 개발이 시급하며, 다양한 기능의 자동화에 대한 연구\ulcorner개발이 뒷받침되어야 한다. 현재 우 리나라 연사기 기술수준은 다른 섬유기계에 비해 선진국 수준에 가깝게 접근해 있다. 따라서 연사기는 우리 섬유기계 산업계와 기계공학인 여러분의 적극적인 관심과 노력이 모아진다면 비 교적 단시간 안에 선진국과 견줄 수 있는 분야라고 생각된다.
윤상혁,안화승,박동화 한국공업화학회 1998 한국공업화학회 연구논문 초록집 Vol.1994 No.1
The decomposition of carbon dioxide has been investigated using thermal plasma. Carbon dioxide is decomposed in the thermal plasma process of high temperature and converted to another materials in the quenching process. From the thermodynamic equilibrium calculations, it is known that carbon dioxide is decomposed over 2,500K at atmospheric pressure and carbon dioxide is reacted with hydrogen, methane or water to be converted to other material over 1,200K at atmospheric pressure. When carbon dioxide is decomposed directly, the decomposition efficiency is very low because of recombination into carbon dioxide during the quenching step. However when carbon dioxide is reacted with hydrogen, methane or water to be decomposed, the decomposition efficiency is very high because carbon dioxide is decomposed to be converted into carbon monoxide and hydrogen during the quenching step.
발포제 혼합에 따른 압출법 단열판의 물리적 특성에 관한 연구
윤상혁,송태협,이세현 한국폐기물자원순환학회 2014 한국폐기물자원순환학회지 Vol.31 No.8
Hydrochlorofluorocarbon (HCFC) is an ozone-depleting substance that is subject to environmental regulations based on the Montreal Protocol, and in Republic of Korea, which is regarded as a developing country, its use will be restricted in phase starting in 2013 until finally being prohibited in 2030. HCFC is regulated based on the Tokyo Protocol, HCFC is a regulated construction material for carbon dioxide reduction with GWP of 1,700 ~ 2,400 times that of CO2, with a GWP of 1. KS M 3808 than in the reference indicated in the C5 (15 : 15 : 20 : 50%) and C9 (20 : 10 : 20 : 50%) 0.33 mm 0.31 mm Cell size is shown in the analysis, etc. The compressive strength of the insulation, foaming agent mixing ratio according bending failure load, the thermal conductivity (initial and long-term), moisture permeability coefficient, combustible results, showed superior.
윤상혁,조대철 순천향대학교 부설 산업기술연구소 2001 순천향 산업기술연구소논문집 Vol.7 No.2
We investigated a contiouous, chemical soil flushing method using β-cyclodextrin solution in a glass bed column, packed with well-prepared sand. The effluent solution was alalyzed via fluorescence spectrometric method, We found that cumulative HOC(hydrophobic organic compound) concentrations in the effluent, increased with flow rates of the surfactant solution as well as time (or number of washes). Also, phenanthrene was more effectively removed out of the bed than naphthalene probably due to its higher hydropholbicity. The HOC removal curves were found to be S-shaped as was usually found in elsewhere.
한국과 미국의 원전 중대사고 시 소외 사고결말평가 시스템 비교 연구
윤상혁,김민성,김광표 (사)한국방사선산업학회 2022 방사선산업학회지 Vol.16 No.3
Having experienced the TMI, the Chernobyl, and the Fukushima accident, NPPs are beingforced to follow stricter safety procedures. Korea and the US are using S-REDAP and RASCAL offsiteconsequence assessment systems based on relevant laws. In accordance with the Act on PhysicalProtection and Radiological Emergency, domestic NPP operators use the assessment system to determineemergency resident protection measures. For accurate resident protection measures, high reliability ofthe domestic consequence assessment system and methodology is important. The purpose of this studyis to compare methodologies of consequence assessment systems in Korea and US and to compare andanalyze assessment results. In this case, the result comparison analysis used an assessment code thatuses the domestic consequence assessment methodology. To achieve this, first, the methodologies of thetwo countries were compared. Second, a simulation scenario was established. Finally, assessment wasconducted based on the simulated scenario. It was found that there are differences in the source termassessment in the inventory and radioactive decay method, the core emission fraction applied unit, and thecore damage input method. In the atmospheric diffusion assessment, the diffusion model was the same asthe Gaussian model, but the domestic assessment models were AERMOD and CALPUFF, and the US wasTADPLUME and TADPUFF. In the dose assessment, there were differences in the duration of the derivedresults and the dose conversion factor. The simulation scenario was set as a scenario in which radioactivematerial was released outside the NPP, and the leakage rate at the time of release was set at 5% hr-1, andthe core damage was set at 5% of the core melt. As a result of the total emission amount, assessment codewas evaluated 1.8 times more conservatively than RASCAL. The initial dose was evaluated 5 to 9 times moreconservatively on assessment code, and 2 to 4 times more conservatively on RASCAL for the mid- to longtermdose. The initial dose was due to the difference between the emission amount and the assessmentperiod, and the mid- to long-term dose was considered to be due to the difference in the terrain effect. The results of this study are expected to prove the reliability of domestic accident assessment system andmethodologies and to be used in the prediction of doses in case of severe accidents.