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P 변조도핑한 In(Ga)As/InGaAsP 양자점에 대한 운반자 동역학
장유동,박재규,이동한,홍성의,오대곤,Jang, Y.D.,Park, J.,Lee, D.,Hong, S.U.,Oh, D.K. 한국진공학회 2006 Applied Science and Convergence Technology Vol.15 No.3
P-modulation doping된 In(Ga)As/InGaAsP 양자점에서의 decay time 특성을 undoped 양자점 시료와의 비교를 통해 살펴보았다. 10 K 에서의 photoluminescence (PL) 세기는 doping 된 양자점이 doping되지 않은 양자점에 비해 약 10배 정도 약하게 나왔다. 또한 Time resolved PL (TR-PL) 실험을 통해 얻은 양자점 시료의 기저상태 PL peak 에서의 decay time은 doping된 양자점이 doping 되지 않은 양자점에 비해 매우 짧게 나왔다. 이러한 PL 세기와 decay time 특성을 통해서 본 연구에서 측정한 doping 된 양자점의 경우에는 doping에 의해 결함이 증가하게 되고, 그로 인해 운반자의 비발광 경로가 증가하게 되어 doping 된 양자점의 경우에 decay time이 짧게 나타나는 것으로 분석하였다. We have investigated optical properties of p-modulation doped In(Ga)As quantum dots (QDs) on InP substrate with a comparison with the undoped QDs. Photoluminscence (PL) intensity of doped QDs at 10 K was about 10 times weaker than that of undoped QD sample. The decay time of doped QD sample at its PL peak, obtained from the time-resolved PL (TR-PL) experiment at 10 K, was very fast compared to that of undoped sample. We interpret that this fast decay time of the doped QD sample comes from the addition of non-radiative recombination paths, which are originated from the doping-related defects.
장대련,Joonsuk Jang,Eric Y. Lee,Hosun Lee,Boinn Chang 한국마케팅과학회 2017 Journal of Global Fashion Marketing Vol.8 No.1
Transgressions can result in negative consequences, especially when committed by global companies. Some of the biggest multinational companies in the world take extra steps to be socially responsible and to have positive reputations in domestic and foreign markets. Despite the extra steps that may be taken, it is a common occurrence for some of these companies to commit transgressions. The knowledge of the eff ect of corporate social responsibility (CSR) history and the country of origin of transgressing companies is scarce in studies that examine the consumers’ reasoning process to forgive or not to forgive the transgression. While the moral reasoning process to forgive transgressions has been examined in instances with public fi gures, studies are lacking in the instance of companies. This study will bridge these gaps by examining the eff ects of CSR history and consumer ethnocentrism on the evaluation of companies before and after transgressions. This study will also examine the eff ects of company evaluations before and after transgressions in the reasoning process of consumers. The authors conclude the study by discussing implications for marketing managers and the potential for further research.
태양열 온수급탕 시스템에서 보조열원 연결방식에 따른 열성능 비교
장환영(Jang H. Y),김병기(Kim B. G),서정세(Suh J. S) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.11
This paper is to simulate a solar hot water system with auxiliary heater connected in series and parallel under draw profile. This system consists of two evacuated collectors of total aperture area of 4 m2, 300 ㎏ storage tank, 3 kW electronic heater, difference temperature controller, pump, and so on. Long term system performnace is estimated by using TRNSYS model with the weather data in Jinju, 2005. This simulation model is used to estimate the annual variation of annual energy performance, the solar fraction and system efficiency, with resperct to difference of hot water temperature(40℃, 50 ℃, 60℃) in two types system. The annual solar fraction obtained 86.3%, 72.0%, 59.7% in series, 65.6%, 33.4%, 15.1% in parallel and the system efficiency is 41% in series, 24.9%, 13.6%, 6.5% in parallel. The maximum auxiliary energy was needed during the months of December and January in both of all this system.