http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
스마트 설계 플랫폼 적용을 위한 공통기기 설계 모듈 개발
박성열(Sung Youl Park),이승재(Seung Jae Lee),유인수(In Soo Ryu),김영두(Young Doo Kim),최선아(Sun A Choi) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
This study aimed to develop design modules of common facilities to mount on STED(Smart Thermal Energy Design) platform. Common facilities were defined as the peripheral equipments generally used for thermal energy-intensive industrial facilities and consist of cyclone, bag filter, SCR(Selective Catalytic Reduction), hot gas cooling heat exchanger, pump and blower. The level of STED platform user was considered as a beginner in the field of thermal energy-intensive industrial facilities and therefore, the design modules were based on general principles could be easily understood by the STED platform users. For easier use and conceptual consistency, all design modules comprised data browser, design panel and module library. Design module was graphically defined in flow sheet and data for streams and modules were set up at each tab in data browser. At this stage, the configuration and conceptual flow of design modules for STED platform were made in view of user and the modules to be revised according to the basis of STED platform.
기술수용모델(TAM)을 이용한 농업교육프로그램 참여의향도 분석과 향상 방안
박성열 ( Sung-youl Park ),최승철 ( Seung-churl Choi ),차승봉 ( Seung-bong Cha ),김재선 ( Jae-seon Kim ),송민영 ( Min-young Song ) 한국농업정책학회 2011 농업경영정책연구 Vol.38 No.3
The purposes of the study were to determine the relationships among the factors that affect farmers participation intention in agricultural education programs and to propose implications for improvement based on the technology acceptance model. Also, determined were some descriptive characteristics of the selected factors. The study sample was 219. For descriptive statistics such as frequencies, means and correlation coefficient, SAS version 9.1 was used. In addition, LISREL version 8.30 was employed for statistical analyses of the structural equation models. The general structural equation model based on TAM included perceived usefulness, perceived ease of use, attitude, and participation intention as endogenous variables and accessibility, self-efficacy and social norm as exogenous variables. The study results confirmed the acceptability of the model to understand farmers` participation intention in agricultural education programs. Attitude, perceived ease of use, and self-efficacy were identified having direct effect on participation intention in agricultural programs. In terms of the magnitude of the parameter estimates, attitude was the most significant factor related to participation intention. It was revealed that accessibility had not direct and indirect effect on any endogenous variables.
이산화탄소 흡수 공정에서 흡수액 최적 재생 조건에 대한 이론적 고찰
박성열 ( Sung Youl Park ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.6
에너지 수요의 지속적인 증가는 화석 연료의 사용을 통해 상당한 부분이 충족되고 있으며 이로 인한 이산화탄소의 배출은 지구온난화의 주요 원인으로 인식되고 있다. 대규모 발생원으로부터 이산화탄소를 포집하기 위한 방안의 하나로 흡수 공정이 적용되고 있으며, 흡수제의 흡수 및 재생으로 구성된 연속 순환 공정 특성상 흡수제의 특성뿐만 아니 라 흡수·재생 운전 조건은 전체 공정 성능에 매우 중요한 부분을 차지한다. 이러한 최적의 운전 조건은 실제로 운전 되고 있는 공정에서 찾아내는 것이 최선이라 할 수 있으나, 이를 위해 실제 상용 공정의 운전 변수를 임의로 변경하는 것은 공정 안정성 측면에서 현실적으로 불가능한 경우가 많다. 따라서 본 논문에서는 이러한 현실적인 제약을 극복하고자 흡수제의 기-액 상평형에 대한 이론적인 접근법을 적용하였다. 12 wt% NH3 수용액을 이용한 CO2 흡수 공정에 서 최적 흡수·재생 조건 파악에 적용된 이론적인 접근법을 20 wt% Monoethanl amine (MEA) 수용액에 적용하여 흡수제의 최적 재생 조건을 예측하였다. 12 wt% NH3 수용액을 CO2 흡수·재생 공정에 사용할 경우, 재생 공정으로 공급하는 흡수액의 CO2 부하(loading)를 0.4 이하로 유지하는 것이 필요한 반면, 20 wt% MEA 수용액을 사용하는 경우 에는 재생 공정으로 공급되는 흡수액의 CO2 부하에 대한 제한이 필요 없음을 알 수 있었다. 최적 재생 온도는 이론적 접근법을 이용해서 재생 공정으로 공급되는 흡수액의 CO2 부하에 따라 결정할 수 있으며, 재생된 흡수액의 CO2 부하 는 흡수 공정에서 필요한 CO2 흡수량에 따라 결정되고 이를 기준으로 최적 재생 온도에 해당하는 열원의 공급량을 결 정할 수 있게 된다. 12 wt% NH3 수용액을 이용한 실험실 규모의 연속 CO2 흡수·재생 실험에서 최적 재생 조건을 비교적 정확하게 예측할 수 있었던 이론적 접근법을 20 wt% MEA 수용액에 적용하여 최적 재생 조건 예측에 적용할 수 있음을 확인하였고, 실제 화학흡수제를 이용한 CO2의 흡수·재생 공정의 설계 및 운전에 사용할 수 있는 가능성을 확 인하였다. The considerable portion of energy demand has been satisfied by the combustion of fossil fuel and the consequent CO2 emission was considered as a main cause of global warming. As a technology option for CO2 emission mitigation, absorption process has been used in CO2 capture from large scale emission sources. To set up optimal operating parameters in CO2 absorption and solvent regeneration units are important for the better performance of the whole CO2 absorption plant. Optimal operating parameters are usually selected through a lot of actual operation data. However theoretical approach are also useful because the arbitrary change of process parameters often limited for the stability of process operation, In this paper, a theoretical approach based on vapor-liquid equilibrium was proposed to estimate optimal operating conditions of CO2 absorption process. Two CO2 absorption processes using 12 wt% aqueous NH3 solution and 20 wt% aqueous MEA solution were investigated in this theoretical estimation of optimal operating conditions. The results showed that CO2 loading of rich absorbent should be kept below 0.4 in case of 12 wt% aqueous NH3 solution for CO2 absorption but there was no limitation of CO2 loading in case of 20 wt% aqueous MEA solution for CO2 absorption. The optimal regeneration temperature was determined by theoretical approach based on CO2 loadings of rich and lean absorbent, which determined to satisfy the amount of absorbed CO2. The amount of heating medium at optimal regeneration temperature is also determined to meet the difference of CO2 loading between rich and lean absorbent. It could be confirmed that the theoretical approach, which accurately estimate the optimal regeneration conditions of lab scale CO2 absorption using 12 wt% aqueous NH3 solution could estimate those of 20 wt% aqueous MEA solution and could be used for the design and operation of CO2 absorption process using chemical absorbent.
구조방정식 모델을 이용한 농업 마이스터 대학 교육프로그램 교육효과성 연구
박성열 ( Sung-youl Park ),최승철 ( Seung-churl Choi ),차승봉 ( Seung-bong Cha ),정승화 ( Seung-hwa Jung ),김기주 ( Ki-ju Kim ) 한국농업정책학회 2012 농업경영정책연구 Vol.39 No.1
This study was designed to identify factors affecting the educational effect of Agriculture Meister College education programs with the sample of Agriculture Meister College students. The study set up a general structural model which included accessibility, self-efficacy, and social norm as exogenous variables and perceived easiness, perceived usefulness, attitude, and educational effect as endogenous variables. The result proved the model to be a good enough to understand the educational effect of Agricultural Meister Program based on the goodness fit statistical results. According to the results of parameter estimates and significance, easiness and usefulness among the endogenous variables were identified having direct effects on the educational effect, key endogenous variable. Meanwhile, only accessibility was found having direct effect on the educational effect. In addition, accessibility and self-efficacy were determined having indirect effects on the educational effect through easiness as an intervening variable. Further, self-efficacy and social norm were identified having indirect effects on the educational effect via usefulness. To sum up these results, it is suggested that easiness and usefulness are important variables compared to attitude as endogenous variables in the model.
구조방정식 모델을 이용한 농업 마이스터 대학 교육프로그램 교육효과성 연구
박성열(Sung-Youl Park),최승철(Seung-Churl Choi),차승봉(Seung-Bong Cha),정승화(Seung-Hwa Jung),김기주(Ki-Ju Kim) 한국농식품정책학회 2012 농업경영정책연구 Vol.39 No.1
This study was designed to identify factors affecting the educational effect of Agriculture Meister College education programs with the sample of Agriculture Meister College students. The study set up a general structural model which included accessibility, self-efficacy, and social norm as exogenous variables and perceived easiness, perceived usefulness, attitude, and educational effect as endogenous variables. The result proved the model to be a good enough to understand the educational effect of Agricultural Meister Program based on the goodness fit statistical results. According to the results of parameter estimates and significance, easiness and usefulness among the endogenous variables were identified having direct effects on the educational effect, key endogenous variable. Meanwhile, only accessibility was found having direct effect on the educational effect. In addition, accessibility and self-efficacy were determined having indirect effects on the educational effect through easiness as an intervening variable. Further, self-efficacy and social norm were identified having indirect effects on the educational effect via usefulness. To sum up these results, it is suggested that easiness and usefulness are important variables compared to attitude as endogenous variables in the model.