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      • Poster Session : PS 0984 ; Can We Differentiate Biliary Diseases with CT Hounsfi eld Unit of Gallbladder?

        ( 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 추계학술발표논문집 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.

      • Ordering and Orientation of Giant Nanostructures from High-Molecular-Weight Block Copolymer via Solvent Vapor Annealing Process

        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>

      • Al<sub>2</sub>O<sub>3</sub> multi-density layer structure as a moisture permeation barrier deposited by radio frequency remote plasma atomic layer deposition

        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>

      • KCI등재

        순방향 마이크로초 단위의 실시간 편광상태 검출 시스템

        정현수(Hyunsoo Jung),신서용(Seoyong Shin) 한국통신학회 2008 한국통신학회논문지 Vol.33 No.1C

        본 논문에서는 실시간으로 빛의 편광상태(SOP)를 파악할 수 있는 장치를 소개한다. 소개하는 장치는 광파를 수평 선형편광과 수직 선형편광 성분으로 분리하고, 각각을 기준 광원의 수평 선형편광 및 수직 선형편광 성분들과 중첩시키고 이로부터 발생한 비트신호들을 시간 영역에서 측정하여 비교함으로써 광파의 SOP를 파악해 내는 순방향(feed-forward) 측정 시스템으로서 귀환(feedback) 방식을 이용하는 기존의 방식들에 비해 SOP 측정시간을 실시간으로 단축시키는 장점을 갖고 있다. 본 논문에서는 또한 SOP 측정 과정에서 수반될 수 있는 광소자의 복굴절 변화에 의한 측정 오차를 매우 간편하고 정확하게 제거할 수 있는 새로운 오차 보정 방식을 소개한다. 제안하는 시스템의 동작과 성능을 모의실험 및 광학 실험을 통해 입증하였다. In this paper, we introduce a real-time state-of-polarization (SOP) finding system. The system divides the optical wave into linear horizontal- and vertical-SOP components and measures two different beat-signals, which are produced by superposition with reference optical source, in time domain. From these measured beat signals we can get SOP information of the signal instantly. Since the proposed scheme is a feed-forward measurement system, comparing with conventional systems which require an optical feedback loop, the measurement time becomes reduced tremendously. We also introduced a novel calibration method for compensating birefringence-related errors which may occur during the measurement. We prove the operation and performance of the proposed system through computer simulation and actual experiments.

      • KCI등재

        체육교사학습공동체 참여를 통한 교사 전문성 개발 양상에 대한 질적 메타분석

        정현수(Hyunsoo Jung),윤기준(Keejoon Yoon) 한국스포츠교육학회 2020 한국스포츠교육학회지 Vol.27 No.2

        본 연구의 목적은 국내에서 수행된 체육교사학습공동체 관련 연구를 종합적으로 분석함으로써 교사학습공동체 참여를 통한 체육교사의 전문성 개발 양상을 이해하고 향후 관련 연구 수행에 필요한 시사점을 도출하는 데 있다. 이를 위해 체계적 문헌 분석 방법으로 관련 연구물을 수집하였으며 Wenger-Trayner &Wenger-Trayner(2015)의 실천공동체 이론을 분석틀로 활용하여 분석하였다. 연구결과는 다음과 같다. 첫째, 긍정적 유대관계 및 자발적 참여가 구성원의 소속감 형성에 영향을 미쳤다. 둘째, 교사학습공동체 참여를 통한 전문성 개발 과정을 이해하는 세 가지의 기반과 네 가지의 세부 유형이 도출되었다. 셋째, 교사학습공동체 참여를 통한 전문성 개발은 수업 개선, 업무 능력 향상, 교직관 변화의 세 가지 차원으로 나타났다. 연구결과 및 논의를 바탕으로 연구의 초점화 및 선순환 연결고리 탐색의 필요성을 제안하였다. The purpose of this study was to understand physical education (PE) teachers’ professional development through participating in teacher learning communities and to explore future directions on PE teacher learning communities. Studies collected through systematic literature review were analysed by the framework of communities of practice (CoP) by Wenger-Trayner & Wenger-Trayner (2015). The findings were categorized into: i) positive relationships among members and engaging in CoPs voluntarily had effect on forming membership, ii) three platforms and four types for teachers’ professional development through participating in CoPs emerged, and iii) teachers were able to enhance the quality of work ability and pedagogies and to change their educational philosophy. Drawing on the findings and discussion, implications for undertaking future PE-CPD research are suggested.

      • 마이크로가공의 가공물 재질에 따른 절삭 특성에 관한 연구

        정현수(Hyunsoo Jung),김종민(Jongmin Kim),홍민성(Minsung Hong) 한국생산제조학회 2007 한국생산제조시스템학회 학술발표대회 논문집 Vol.2007 No.5

        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.

      • KCI등재

        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.

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