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황시우(Hwang, Si Woo),조한무(Cho, Han-Moo) 한국홀리스틱융합교육학회 2009 홀리스틱융합교육연구 Vol.13 No.2
이 연구의 목적은 포트폴리오 증거자료를 활용한 체육 수업의 변화를 살펴보는 데 있다. 본 연구는 포트폴리오 증거자료를 체육 수업에 적용했을 경우 나타나는 독특한 수업 문화를 살펴보기 위해 용인시 수지구 S초등학교 6학년 1개 반을 선정하였다. 포트폴리오 증거자료의 타당성을 점검하기 위해서 3차례의 예비연구를 실시하였으며 예비 연구를 통해 완성된 포트폴리오 개인과제를 6차시 간이 배구 수업에 적용하였다. 자료 수집은 비디오 촬영, 참여 관찰, 심층 면담, 반성일지를 통해 이루어졌고 체육 수업에 대한 인식의 변화, 학습 활동, 교사 조언에 대한 반응을 분석하기 위해 귀납적 범주 분석을 하였다. 자료의 타당성을 확보하기 위해 삼각 검증 법, 심층적 기술, 참조 자료의 사용 등을 활용하여 다음과 같은 결론을 얻었다. 첫째, 학생들의 체육 수업에 대한 인식의 변화는 자신의 실력이 늘어가는 것을 보며 보람을 느끼는 뿌듯함, 체육 수업에 점점 흥미를 느껴가는 좋아지는 체육 수업, 포트폴리오 증거자료를 작성하는 시간이 운동 시간에 대한 침범이라고 느끼는 인식 등의 변화가 있었다. 둘째, 학생들의 학습 활동에 대한 변화는 자기반성의 도구로 쓰이는 나를 볼 수 있는 거울, 지나간 수업을 돌아 볼 수 있는 기억에 남는 수업, 미처 알지 못했던 자신의 소질을 발견하는 소질 계발, 정직하지 못한 눈속임인 친하면 좋은 평가 등이 있었다. 셋째, 학생들의 교사 조언에 대한 반응에는 교사의 조언을 통해 자신의 문제점이 개선되는 것을 보고 고마움을 느끼는 아동과 반면에 자신의 수준이 발전되지 않고 그대로 머물러 있거나 똑같은 소리의 반복으로 느끼는 경우 교사의 조언을 잔소리로 느끼는 아동들이 있었다. The purpose of this study was to look through the change of the P.E-instruction. using the portfolio evidence. The detailed research methods to proceed this study were as followings; How the students recognize the P.E. when the portfolio is applied to the students? What was the feature of the students in their academic activities? How' the students' sponse to the teachers' advice? I have selected a 6 grade class in Suji, Yong In to research the unique class culture when applying the portfolio to the class. To verify the feasibility of this study, I have done three times of pre-experiments. And the finished portfolio has applied to the volleyball class six times. The data has been gathered through video recording, observing the student, and the reflection on one's behavior. I have performed the inductive category analysis to analyze the conception change on the class, academic activities, and the responses to the teachers' advice. To gain the feasibility on the data, I have used the triangulation, deep description, and references. The conclusions I have achieved are as followings. First, when it comes to the students' conception change, they are satisfied with their improved ability. They also got more and more interest in P.E. And some students consider making their portfolio interrupting the P.E. Second, the students have shown the change in their activities. This change includes the self-reflection for themselves. It also affect students' memory on the class itself. And they can find their hidden ability through the class. Finally, they recognize the unfair evaluation among acquaintances. Finally, some students feel the appreciation on teachers' advice with viewing their improvement through teachers' help while the others still consider the teacher's advice a kind of small talks.
초경량 Fe-27Mn-12Al-0.8C 이상조직강의 상온인장변형특성
하민철(M. C. Ha),황시우(S. W. Hwang),구진모(J. M. Koo),이재곤(J. G. Lee),박경태(K.-T. Park) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.10
Room temperature tensile deformation behavior of a low density Fe-27Mn-12Al-0.8C duplex steel was investigated to understand for plastic deformations with constituent phases. Various ordered phases were formed by quenching of the steel after annealing at the (austenite + ferrite) two phase region. The B2 domains were formed in disordered ferrite matrix. In addition to the B2 domains, fine D0 phases were evenly distributed through both B2 domains and disordered ferrite matrix. The nano-sized k-carbides were precipitated in austenite. The steel exhibited the relatively high yield strength and the low strain hardening rate initially, leading to the moderate elongation. Deformed structure of ferrite is manifested by short, straight segments of paired superdislocations. In austenite, a single planar dislocation glide was dominant at low strains and multiple planar slip occurred at high strains. Based on these microstructural observations, it is suggested that strain hardening of the steel is dominated mainly by shearing of the ordered phases by superdislocations (in ferrite) and planar gliding dislocation (in austenite).
냉간 압연에 따른 N 함유 저 Ni계 Duplex Stainless Steel의 변형거동
최점용(J. Y. Choi),황시우(S. W. Hwang),지정훈(J. H. Ji),김세라(S. R. Kim),박경태(K. -T. Park) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.5
The effects of nitrogen addition on the strain induced martensitic transformation (SIMT) behavior of duplex stainless steel (D-STS) with the low nickel content were examined in a wide range of strain by means of cold rolling. Nitrogen of 0.1,0.2 and 0.3 wt.% was added into Fe-20Cr-5Mn-0.2Ni D-STS (in wt.%) and cold rolling was conducted up to the effective strain of ~1.45 after annealing at 1100 C for 30 min. In the as-annealed state, the austenite fraction increased with increasing the N content. Regardless of the N content, the ferrite grain size was coarser than that of austenite. The stacking fault energy of austenite of the present D-STSs inferred by the element partitioning analysis was low enough so that SIM transformation is available. Accordingly, during cold rolling, SIMT occurred in austenite with a sequential manner of austenite → ε martensite → α’ martensite with increasing strain. By contrast, the deformed microstructure of ferrite was dominated by dislocation cells.
Ni계 초내열합금 NIMONIC 80A 의 고온변형거동
하민철(Min Cheol Ha),황시우(Si Woo Hwang),김종수(Chong-Soo Kim),김철유(Cheol Yu Kim),박경태(Kyung-Tae Park) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.5
High temperature deformation behavior of NIMONIC 80A was studied in the temperature range of 900 ~ 1200 C and the strain rate range of 0.02 ~ 20 s<SUP>-1</SUP> via hot compression test. Processing maps for hot working were constructed on the basis of the efficiency of power dissipation using a dynamic materials model. The compression strength during hot compression increased with increasing the strain rate but decreased with increasing temperature. At low strains, NIMONIC 80A did not exhibit the instability domain regardless of the strain rate and temperature. At high strains, the processing map showed the instability domain at low strain rates and 900~ 950 C temperature range.
상이한 초미세립 구조를 갖는 OFHC Cu의 연성에 영향을 미치는 요소인자
박이주(L. J. Park),감형원(H. W. Kim),이종수(C. S. Lee),황시우(S. W. Hwang),박경태(K.-T.Park) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.5
Tensile ductility of OFHC Cu with the different ultrafine grained (UFO) structures, which were fabricated by the different routes of equal channel angular pressing (ECAP), was associated in detail with the microstructural characteristics developed by ECAP. OFHC Cu having the lamellar and equiaxed UFO structures was prepared by ECAP of routes A and Bc respectively up to 8 and 16 passes. Their microstructures were closely examined by transmission electron microscopy and orientation image mapping. Tensile tests at room temperature were conduced on the ECAPed samples under the quasi- static condition of 10?³ s?¹ and 1 s?¹. Uniform elongation of the lamellar UFO samples decreased with increasing the ECAP passage while both uniform and total elongations of the equiaxed UFO samples increased. In the case of route A producing the lamellar UFO structure, the fractions of high angle grain boundaries and grains less than 0.5 ㎛ increased significantly but an analysis revealed that the dislocation free length decreased with increasing the ECAP passage. For route Be resulting in the equiaxed UFO structure, the fraction of high angle grain boundaries increased but the grain size distribution and the dislocation free length remained nearly unchanged with increasing the ECAP passage. From the present experiments and analyses, it was found that tensile ductility of lamellar UFO OFHC Cu is primarily controlled by the dislocation free length and that of the equiaxed one is mainly dependent on the fraction of high angle grain boundaries.