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대학단위 온실가스 관리 프로그램 개발을 위한 대학 내 시설 담당자들의 인식 조사
위대현(Daehyun Wee),김윤경(Yoon Kyung Kim),최정현(Jung Hyun Choi) 한국콘텐츠학회 2014 한국콘텐츠학회논문지 Vol.14 No.12
본 연구에서는 대학의 에너지 사용 및 온실가스 배출 활동을 체계적으로 관리할 수 있는 온실가스 통합관리 프로그램 개발을 위해 대학 내 시설 담당자들을 대상으로 설문 조사를 실시하였다. 설문 결과에 따르면 실무자들은 기후변화나 온실가스·에너지 목표관리제에 대한 이해도가 높은 편이었으나, 대학의 에너지 사용량 및 그에 따른 온실가스 배출량에 관해서는 상대적으로 이해가 부족한 것으로 나타났다. 설문조사의 내용을 바탕으로 본 연구에서 도출한 온실가스 관리 시스템 개발의 기본 방향 및 고려 요소는 다음과 같다. 온실가스 관리 시스템은 현재의 온실가스 배출량을 정확히 파악하고, 대학의 온실가스 배출 특성을 정확히 파악하며, 사용자의 편의를 도모하는 수단들이 구현될 수 있도록 개발되어져야 한다. 더하여 온실가스 관리 시스템에 대한 적극적인 교육과 홍보가 이루어져야 한다. 본 연구에서 진행한 설문조사의 결과는 효과적인 온실가스 관리 프로그램의 개발 방향을 모색하기 위한 기초자료로서 높은 활용도를 갖는다. We examine the awareness of the facility managers in Korean universities and colleges over the global climate change and over the national greenhouse gas (GHG)·energy target management program via a questionnaire survey. The result shows that the survey participants maintain high awareness on global and national issues including the climate change and the concept of the national GHG management framework. On the other hand, the responsibility of universities and colleges associated to these issues is not recognized as well, showing the necessity for further education. Additionally, important implications on the direction and the major factors that should be considered during the development of a GHG management program for universities and colleges are deduced from the result of the survey. In order to be effective in universities and colleges, a GHG management program must be able to estimate the present level of emissions accurately, to address campus-specific emissions characteristics, and to facilitate ease use for generic users. At the same time, active supporting services including education and promotion should be incorporated. The survey result can be utilized as basic data in guiding the future development of effective GHG management programs.
김보연(Boyeon Kim),위대현(Daehyun Wee) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
The efficiency and power output of conventional thermoelectric generators (TEGs) is relatively low compared to traditional devices for energy conversion, which makes it important to control the operating condition of a TEG. In order to implement an adequate strategy of control, one must identify an appropriate model of the transient behavior of the thermoelectric module. Most transient models for thermoelectric modules are complex high-dimensional dynamical systems including partial differential equations. The main objective of the study is to develop an appropriate low-dimensional model that reasonably describes the transient behavior of thermoelectric modules. Reduced-order modeling of a thermoelectric element is first attempted by using a simple projection scheme on the governing partial differential equation. The resulting simplified model is crossvalidated by comparing the performance to the original partial differential equation. We further study the transient behavior of a full-scale generator.
알칼리 토금속을 충진한 질소계원소 대체 스쿠터루다이트의 열전특성
방세미(Semi Bang),위대현(Daehyun Wee) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
First principles calculations have been performed in order to investigate electronic band structures and related transport properties of pnictogen-substitued skutterudites filled with alkaline-earth elements (M<SUB>x</SUB>Co<SUB>4</SUB>A<SUB>6</SUB>Te<SUB>6</SUB> where M=Ca, Sr, or Ba, A=Ge or Sn, and x=0.5 or 1). Electronic transport properties related to thermoelectricity, including the Seebeck coefficient and the electrical conductivity, are computed by using the Boltzmann transport formalism within the constant-relaxation-time-approximation. The results are compared against the corresponding properties of the unfilled pnictogen-substitued ternary skutterudites (CoA<SUB>1.5</SUB>Te<SUB>1.5</SUB>) to identify the effects of filling, based on which the potential of filled pnictogen-substituted skutterudites for thermoelectric applications is evaluated. The possible changes in the ionic character of the interatomic bonding, which was suspected to be an important scattering source, are probed by analyzing the projected density of states.
제일 계산 기법을 이용한 백철광계 FeAs₂ 열전재료 특성 연구
방세미(Semi Bang),Rabih Al Rahal Al Orabi,손지현(Ji-Hyun Son),김현아(Hyeon A Kim),김동민(Dong-Min Kim),원동희(Dong-Hee Won),김지수(Ji-Su Kim),위대현(Daehyun Wee) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
There are significant demands for thermoelectric materials that can be used for environment-friendly cooling applications that need to be met. A few recent studies reported thermoelectric properties of the FeAs₂ marcasite compound, which has a potential for becoming a good thermoelectric material for low-temperature cooling applications. The compound can be more environment-friendly and more economically viable than other competing materials, for the composition does not involve rare and expensive element like Te or Pt. In this study, we investigate thermoelectric properties of the FeAs₂ marcasite compound by first-principles calculations in order to investigate the feasibility for the use in practical cooling applications. Electronic band structures and density of states are constructed from DFT (density functional theory) calculations, from which electrical properties, including the Seebeck coefficient and the electrical conductivity, are estimated. In addition, vibrational characteristics are investigated through DFPT (density functional perturbation theory) calculations.