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김수환,손광효,오현철,Kim, Suhwan,Son, Kwanghyo,Oh, Hyunchul 한국재료학회 2020 한국재료학회지 Vol.30 No.3
The magnetocaloric effect (MCE), which is the reversible temperature change of magnetic materials due to an applied magnetic field, occurs largely in the vicinity of the magnetic phase transition temperature. This phenomenon can be used to induce magnetic refrigeration, a viable, energy-efficient solid-state cooling technology. Recently, Metal-organic frameworks (MOFs), due to their structural diversity of tunable crystalline pore structure and chemical functionality, have been studied as good candidates for magnetic refrigeration materials in the cryogenic region. In cryogenic cooling applications, MCE using MOF can have great potential, and is even considered comparable to conventional lanthanum alloys and magnetic nanoparticles. Owing to the presence of large internal pores, however, MOF also exhibits the drawback of low magnetic density. To overcome this problem, therefore, recent reports in literature that achieve high magnetic entropy change using a dense structure formation and ligand tuning are introduced.
DOA 기반 학습률 조절을 이용한 다채널 음성개선 알고리즘
김수환(Kim,Suhwan),이영재(Lee,Youngjae),김영일(Kim,Young-Il),정상배(Jeong,Sangbae) 한국음성학회 2011 말소리와 음성과학 Vol.3 No.3
In this paper, a multi-channel speech enhancement method using the linearly constrained minimum variance (LCMV) algorithm and a variable learning rate control is proposed. To control the learning rate for adaptive filters of the LCMV algorithm, the direction of arrival (DOA) is measured for each short-time input signal and the likelihood function of the target speech presence is estimated to control the filter learning rate. Using the likelihood measure, the learning rate is increased during the pure noise interval and decreased during the target speech interval. To optimize the parameter of the mapping function between the likelihood value and the corresponding learning rate, an exhaustive search is performed using the Bark's scale distortion (BSD) as the performance index. Experimental results show that the proposed algorithm outperforms the conventional LCMV with fixed learning rate in the BSD by around 1.5 dB.
부부갈등과 결혼만족도의 관계 : 의사소통 행동과 부부간 신뢰의 조절효과
김수환(Kim SuHwan),이영호(Lee YoungHo) 학습자중심교과교육학회 2021 학습자중심교과교육연구 Vol.21 No.2
본 연구는 부부갈등과 결혼만족도의 관계에서 의사소통 행동 및 부부간 신뢰의 조절효과를 확인하기 위해 기혼자 330명을 대상으로 자기보고식 설문을 실시하였다. 부부적응척도 중 일치도 척도, 의사소통 행동 질문지, 부부간 신뢰 척도, 한국형 결혼만족도 검사 중 전반적 불만족 척도를 사용하였다. 연구결과, 부부갈등은 결혼만족도, 신뢰, 및 긍정적 의사소통 행동과 부적 상관관계였고, 부정적 의사소통 행동과 정적 상관관계를 보였다. 둘째, 부부갈등과 결혼만족도의 관계에서 부정적 의사소통행동은 유사조절변인으로서 부부갈등의 부정적 영향을 강화하였다. 셋째, 긍정적 의사소통 행동과 부부간 신뢰도 각각 유사조절변인으로서 부부갈등의 부정적 영향을 감소시켰다. 본 결과가 지니는 의의와 한계점에 대해서 논의하였다. The purpose of this study was to find the moderating effect of communication behavior and marital trust between marital conflict and marital satisfaction. For this study, 330 married person were sampled from Seoul, Gyeonggido, and several internet communities to assess the Consensus Scale of Dyadic Adjustment Scale, Communication Behavior Scale, Trust Scale, and Global Dissatisfaction Scale of K-MSI. The results revealed that (a) the significant negative correlation was found among marital satisfaction, marital trust, positive communication behavior and the significant negative correlation was found between marital conflict and negative communication behavior; (b) communication behavior quasi-moderated the relationship between marital conflict and marital satisfaction; (c) marital trust quasi-moderated the relationship between marital conflict and marital satisfaction. Finally, clinical implications and limitations of the study and suggestions for future researches were discussed.
건물일체형 태양광 모듈의 난연 특성 강화를 위한 난연 봉지재 특성 연구
김수환(Kim Suhwan),탁성주(Tark Sung Ju),박계원(Park Kyewon),박종성(Park Jongsung) 한국태양에너지학회 2023 한국태양에너지학회 논문집 Vol.43 No.6
This study examined the flame-retardant properties of several encapsulant types that could replace existing ethylene vinyl acetate to improve the fire safety of Building Integrated Photovoltaic modules when used as exterior building material. For the study, six types of films (flame-retardant polyethylene terephthalate, polyether ether ketone, flame-retardant polyethylene naphthalate, polyimide, polyethylene, and thermoplastic polyurethane) were prepared, and various analyses were performed to determine the fire stability of each film. Thermogravimetric Analyzer results showed that polyimide and polyether ether ketone films had the best thermal stability. Upon measuring the light transmittance, polyimide and polyethylene demonstrated >90% light transmittance. The water vapor transmission rate value for the 50 ㎛-thick polyimide was 270 g/㎡/day. Polyimide film did not ignite during the cone calorimeter measurement; instead, only film shrinkage was observed. Collectively, polyimide showed the best thermal stability and module application characteristics among all six types of films.