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Jung, Hyunsoo,Jeon, Heeyoung,Choi, Hagyoung,Ham, Giyul,Shin, Seokyoon,Jeon, Hyeongtag American Institute of Physics 2014 JOURNAL OF APPLIED PHYSICS - Vol.115 No.7
<P>Al2O3 films deposited by remote plasma atomic layer deposition have been used for thin film encapsulation of organic light emitting diode. In this study, a multi-density layer structure consisting of two Al2O3 layers with different densities are deposited with different deposition conditions of O-2 plasma reactant time. This structure improves moisture permeation barrier characteristics, as confirmed by a water vapor transmission rate (WVTR) test. The lowest WVTR of the multi-density layer structure was 4.7 x 10(-5) gm(-2) day(-1), which is one order of magnitude less than WVTR for the reference single-density Al2O3 layer. This improvement is attributed to the location mismatch of paths for atmospheric gases, such as O-2 and H2O, in the film due to different densities in the layers. This mechanism is analyzed by high resolution transmission electron microscopy, elastic recoil detection, and angle resolved X-ray photoelectron spectroscopy. These results confirmed that the multi-density layer structure exhibits very good characteristics as an encapsulation layer via location mismatch of paths for H2O and O-2 between the two layers. (C) 2014 AIP Publishing LLC.</P>
Jung, Hyunsoo,Jun, Taesuk,Lee, Wooseop,Ryu, Du Yeol The Technical Association of Photopolymers, Japan 2018 フォトポリマ-懇話會誌= Journal of photopolymer science and t Vol.31 No.4
<P>Ordering and orientation of high-molecular-weight (HMW) block copolymer (BCP) are challenging issues for recent technology to push the limit of nanoscopic size to hundredsof-nanometers scale. HMW polystyrene-b-poly(methyl methacrylate)s (PS-b-PMMAs) were used to actualize larger feature sizes of giant lamellar and gyroid (GYR) nanostructures. The solvent vapor annealing (SVA) process was exploited to develop the long-range order nanostructures in the HMW BCP films. Directed orientation of nanostructures and the defect annihilation are discussed in terms of the interfacial interactions on the substrates and topographic trenches to design well-defined regular nanopatterns.</P>
( Hyunsoo Kim ),( Dong Wook Lee ),( Dae Jin Kim ),( Jae Kwon Jung ),( Yun Jin Jung ),( Dong Hyun Kim ),( Sang Dong Kim ),( Mi Jung Lee ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: The Hounsfi eld unit (HU) of CT is related to the composition of the tissue and is used to represent the density of tissue. The HU of the gallbladder (GBHU) varies with the viscosity of bile and ranges from 0 to 20. Methods: We compared GBHU on CT according to biliary diseases as stone (group A), sludge (group B), and functional biliary disease (group C). The patients of three groups who had acute biliary symptom underwent ENBD or PTBD with bile analysis for one year were identifi ed retrospectively. We analyzed the HU of gallbladder with three parameters [point at upper 1/2 (GBHU-A), at lower 1/2 (GBHU-B), ratio of B/A (GBHU-R), not stone itself]. Results: Of the 164 patients in our study, stone in CBD or GB was seen in 99 patients and sludges in 50 patients and functional biliary disease in 15. 40 patients were post-cholecystectomy state. Mean age was 61.9 ± 16.5 in group A, 59.7 ± 12.3 in group B, and 56.0 ± 14.3 in group C (not signifi cant. Mean GBHU-A was 13.1 ± 11.0 in group A, 12.1 ± 5.5 in group B, and 20.7 ± 10.4 in group C and showed mild difference between group B and group C (p=0.51, not signifi cant). Mean GBUH-B was 18.4 ± 14.0, 24.3 ± 9.1, and 21.6 ± 10.9, respectively and no difference was seen between the groups. Mean GBHU-R was 1.56 ± 0.85, 2.28 ± 0.89, and 1.03 ± 0.15, respectively and signifi cant differences were seen between group A and B (p=0.000), between group B and C (p=0.000). Conclusions: The sludge disease showed higher GBHU-B than GBHU-A Functional biliary disease showed that both GBHU-A and GBHU-B were at high levels and showed higher GBHU-A than that in stone and sludge disease.
초등 예비교사 교육과정에 관한 핵심 주체들의 같은 눈, 다른 생각
정현수(Hyunsoo Jung),장경환(Kyunghwan Jang) 한국스포츠교육학회 2021 한국스포츠교육학회지 Vol.28 No.3
본 연구는 초등체육교육의 세 주체인 예비교사, 현직교사, 교사교육자가 바라보는 초등 예비교사교육에 대한 인식을 확인하고 서로의 관점을 비교하여 예비교사교육의 방향을 점검하는 데 그 목적이 있다. 초등 예비교사 6명, 현직교사 5명, 교사교육자 5명을 대상으로 현지 문서와 면담을 통하여 자료를 수집하였고, 수집된 자료는 Strauss(1987)가 제시한 개방‧축‧선택 코딩의 단계를 거쳐 분석하였다. 연구결과는 다음과 같이 도출되었다. 먼저 세 주체 간 공통된 방향성 속에서 요구되는 이해의 장(場)은 1) 메타 교수지식의 의미와 중요성, 2) 내용지식의 수준과 범위, 3) 평가와 피드백에 관하여 결과를 제시하였다. 이어서 서로에 대한 이해를 넘어서는 적극적 차원의 개선을 위해서 1) 교육대학 커리큘럼에 대한 로드맵 제공의 필요성, 2) 알을 깨고 나오는 체육과 교과교육 경험의 중요성을 제안하였다. 논의에서는 세 핵심 주체의 생각 차이를 중심으로 1) 현장 실제성의 양면성, 2) 교육내용의 양면성, 3) 예비교사 교육기관의 양면성, 4) 예비교사 교육 발전을 위한 두 기둥에 대하여 논하였다. The purpose of this study was to identify the perception of elementary initial teacher education by pre-service teachers, in-service teachers, teacher educators, and to compare each other"s perspectives to clarify the direction of initial teacher education curriculum. Qualitative data were collected through in-depth interviews and on-site documents with 6 pre-service teachers, 5 in-service teachers and 5 teacher educators. Data analysis was performed inductively according to open coding, axial coding and selective coding (Strauss, 1987). First, for themes commonly derived between the three groups, we present results on 1) the meaning and importance of Meta-Pedagogical Knowledge, 2) the level and extent of Content Knowledge, and 3) evaluation and feedback. Next, in order to improve specifically beyond understanding each other, we proposed the need to 1) provide a roadmap for the curriculum of the university of education, and 2) importance of P.E. curriculum experience for a leap forward. Finally, we discussed ways to develop 1) practical pedagogy, 2) coursework contents, 3) teacher education institutions, and 4) prospective initial teacher education.
정현수(Hyunsoo Jung) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The air intake system consists of air cleaner, air intake hose and air duct. Its function is to supply clean air to engine and to optimize the snorkel noise. The aim of this work is a development of sporty sound for air intake system by using Robust Design. This paper shows the procedure of optimum design of air intake system for sporty sound.
Comfort Evaluation of Operating Position to Define Appropriate Seat Travel in Excavator
Hoiju Jung,Sanghyuk Lee,Hyunsoo Park,Kwangho Jung,Hyungjoon Kim 대한인간공학회 2015 대한인간공학회 학술대회논문집 Vol.2015 No.10
Objective: The objective of this study is to evaluate the operating position of excavator operator through virtual assessment and to define appropriate seat travel in excavator. Background: In the case of excavator development, position of primary controllers and seat are most important to determine the operating position. Especially, seat position and adjustment range (Travel) make operator seat where they want to. Operating with comfortable posture reduces fatigue of operator, and improves productivity. Therefore, seat position and adjustment range are first considering point to development of excavator. Method: To define appropriate seat travel: (1) Select representative human model to represent all operators, (2) Define basic operating posture to represent all operating postures, (3) Evaluate comfortability of basic operating postures, (4) Define comfort operating position with respect to each operator’s H-point (Hip point), (5) Define seat position and adjustment range with respect to comfort seating positions for all representative human models. Results: Operating position of each representative human model with comfort is found. And it is possible to define the minimum requirement of seat travel which makes all representative human models seat where they want to. Conclusion: We define basic operating postures in excavator. Through comfort evaluation for basic operating posture, we can find operating positions of each of representative human model. From the position, we can define the minimum requirement of seat travel for all representative human models. Application: This study is expected to be applied in defining seat position and travel range for development of new excavator. And position of primary controller and range of hand movement are defined with comfortable operating position. Also position and direction of gauge panel are defined with considering field of vision of operators.
마이크로가공의 가공물 재질에 따른 절삭 특성에 관한 연구
정현수(Hyunsoo Jung),김종민(Jongmin Kim),홍민성(Minsung Hong) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
Currently, in order to increase its applicability, a micro-system has been expanded to various areas such as micro fluidics. Among them a micro-pump is required to deliver the fluid without overflow, which can be possible only with consistent surface of the micro-channels. In general, the applications of the etching process in MEMS are restricted to the silicon-based materials and it is very difficult to obtain the required surface roughness. Micro-machining, however, makes it possible to produce the various surface roughness with controls of spindle, feed rate, and depth of cut, etc. In this paper, the characteristics of the micro-milling process has been investigated to generate the micro-channels with different materials such as aluminium and copper, etc.