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Wet Etching of a Gallium Indium Zinc Oxide Semiconductor for Thin Film Transistor Application
서종현,이상혁,서보현 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
Recently, significant progress has been made in the characterization of gallium indium zinc oxide (GIZO) as a new semiconductor layer instead of the amorphous Si semiconductor used in thin-film transistors (TFTs). However, the wet behavior of a GIZO thin lm in etching solutions that conventionally used in TFT industry has not been reported yet. In this work, the wet etch behavior of RF-magnetron-sputtered GIZO thin films in a wet etchant composed of acetic acid and hydrogen peroxide was studied by using an electrochemical analysis.
$CO_2$레이저빔에 의한 저탄소강판과 아연도금강판의 Tailored Blank 용접에 관한 연구
서종현,김도훈,유병길,이경돈 한국레이저가공학회 1998 한국레이저가공학회지 Vol.1 No.1
A basic research for tailored blank welding between mild steel and Zn-coated steel was carried out with $CO_2$ laser beam. The materials used in this work were low carbon steel sheet with a thickness of 1.2mm and Zn-coated steel sheet with the same thickness and 6.3$\mu$m Zn coating. Experiments were carried out by applying the Taguchi method in order to obtain optimized conditions for the application of tailored blank laser welding method in practical manufacturing process. Optical microscopy, XRD, SEM and TEM analysis were performed to observe microstructures and to determine the solidification mode of welded zone. Also mechanical properties were measured by microhardness test tensile test and Erichsen test in order to evaluate the formability of welded specimen. There was no trapped Zn in the fusion zone, and the phases in this region consisted of polygonal ferrite, quasi-polygonal ferrite, banitic ferrite and martensite. The elongation value of welded specimen was more than 80% of that value in the substrate and LDH value was more than 90% of that value in the substrate metal.
피부의 탄성변화에 따른 피부 가압과 복귀시간 측정을 통한 정량적 림프부종 진단 시스템 개발
서종현,조창노,김성천,정승현,고은실,김광기,Seo, Jong Hyun,Cho, Chang Nho,Kim, Sung Chun,Chung, Seung Hyun,Koh, Eun Sil,Kim, Kwang Gi 대한의용생체공학회 2013 의공학회지 Vol.34 No.4
Lymphedema is a phenomenon in which fluid is accumulated inside tissues due to the damaged lymphatic systems. Lymphedema can cause complications such as lymphangitis, infection, changes in skin texture, fibrosis, and lymphangiosarcoma. In this study, a lymphedema screening system based on the elasticity of the skin is proposed to easily quantify lymphedema. The developed probe consists of touch sensors, a load cell and hall-effect sensors to measure the indentation force on the skin and the return time of the skin. The developed system can be used to estimate the change in the elasticity of the skin to quantify lymphedema. The system was tested with a thyroid phantom and gelatin phantoms of different concentrations and the resulting force and the time were recorded. It was found that the increase in the elasticity leads to a higher indentation force and shorter return time. This shows that the developed system can monitor the change in the skin elasticity by measuring the return time and the indentation force. The feasibility of the system in clinical applications will be evaluated in the future study.
서종현,서미옥,윤성욱 한국소비자·광고심리학회 2016 한국심리학회지 소비자·광고 Vol.17 No.2
In the context of service failure situation, the same service problem could be perceived differently depending upon a consumer’s situational variable, thus may result in different retaliation behavior. The purpose of this study, therefore, was to examine the effects of service expectation (high/low) and face consciousness (high/low) on a consumer’s retaliation behavior (negative word-of-mouth, complaining behavior, complaining for publicity). Furthermore, this paper also try to investigate a moderating role of face consciousness in a relationship between service expectation and retaliation behavior. A scenario technique was employed to empirically test the research hypotheses and two factors (service expectation and face consciousness) were manipulated as high and low version. The empirical results are as follows. First, both the service expectation and face consciousness had a significant impact on retaliation behavior (negative word-of-mouth, complaining behavior, complaining for publicity). In addition, a moderating effect of face consciousness on complaining behavior was also found to be significant. In conclusion, the suggestions and future study directions were proposed based on the above study results. 서비스 실패 상황에서 같은 서비스 실패의 강도를 받더라도 상황변수에 따라 소비자가 느끼는 서비스 실패 강도는 다르며, 그에 따라 기업에 행하는 앙갚음 행동도 차이를 보일 수 있다. 따라서 본 연구는 서비스 실패 상황에서 서비스 기대 정도(높음/낮음)와 체면의식(높음/낮음)이 서비스 실패 후 소비자 보복행위(불평행동, 부정적 구전, 불만홍보)에 미치는 영향을 분석하고, 나아가 서비스 기대 정도가 보복행동에 미치는 영향을 조절하는 체면의식의 효과를 검증하였다. 이를 위해 서비스 실패 상황에 대한 서비스 기대와 체면의식을 조작하여 시나리오를 작성하였으며, 보복행위에 미치는 영향을 실증적으로 분석하였다. 분석결과, 서비스 실패 상황에서 서비스 기대와 체면의식에 따라 소비자의 보복행위 의도에 유의한 차이가 발생하였으며, 서비스 기대정도가 불평행동에 미치는 영향력은 체면의식에 따라 조절되었다. 즉, 소비자는 서비스 실패 상황에서 서비스 기대와 체면의식 정도가 높을수록 보복행위 의도가 높아지는 것을 확인하였으며, 조절효과의 검정에서는 서비스 기대가 높은 상황에서 체면의식에 상관없이 불평행동을 많이 하는 반면, 낮은 서비스 기대상황에서는 체면의식 정도에 따라 불평행동을 다르게 하는 것을 확인할 수 있었다.