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조형미 ( Cho¸ Hyungmi ),이은정 ( Lee¸ Eunjung ) 한국수학교육학회 2021 수학교육논문집 Vol.35 No.3
본 연구는 예비교사가 변수와 관련된 학생의 사고를 어떻게 파악하고 대응하는지를 조사하는 것을 목적으로 하였다. 변수와 관련된 학생들의 사고를 추론하여 그에 따른 지도방안을 제시해 보게 하는 문항에서 예비교사의 주목하기와 해석하기의 특징을 동시에 살펴보았으며 주목하기와 해석하기에 따라 예비교사의 대응하기가 어떻게 제안되었는지 그 특징을 조사하였다. 예비교사 26명의 응답을 분석한 결과, 예비교사들이 학생들의 응답에서 나타나는 변수에 대한 오개념에 주목하기가 쉽지 않음을 보여주었으며, 주목은 하였으나 적절한 해석을 해내지 못한 경우를 확인할 수 있었다. 주목하지 못하고 해석하지 못한 대부분 예비교사는 변수에 대한 전반적인 이해의 부족으로 인해 적절한 대응을 제시하지 못한 것으로 나타났으며, 주목하기와 해석하기가 성공적으로 이루어졌다 하더라도 경험적 지식의 부족으로 인해 적절한 대응을 제시하지 못하였다. 연구 결과를 바탕으로, 예비교사 교육에 주는 시사점을 논의하였다. This study investigated the prospective teacher’s noticing of students’ mathematical thinking from the perspective of how the prospective teacher pays attention to, interprets, and responds to the student’s responses related to variables. The prospective teachers were asked to infer the students' thinking from the variables related to the tasks and suggest feedback accordingly. An analysis of the responses of 26 prospective teachers showed that it was not easy for prospective teachers to pay attention to the misconception of variables and that some of them did not make proper interpretations. Most prospective teachers who did not attend and interpret were found to have failed to provide an appropriate response due to a lack of overall understanding of variables. even though prospective teachers who did proper attend and interpret were found to have failed to respond appropriately due to a lack of empirical knowledge, even with proper attention and interpretation.
Dynamics of an Axially Moving Bernoulli-Euler Beam : Spectral Element Modeling and Analysis
Hyungmi Oh,Usik Lee,Dong-Hyun Park 대한기계학회 2004 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.18 No.3
The spectral element model is known to provide very accurate structural dynamic characteristics, while reducing the number of degree-of-freedom to resolve the computational and cost problems. Thus, the spectral element model for an axially moving Bernoulli-Euler beam subjected to axial tension is developed in the present paper. The high accuracy of the spectral element model is then verified by comparing its solutions with the conventional finite element solutions and exact analytical solutions. The effects of the moving speed and axial tension on the vibration characteristics, wave characteristics, and the static and dynamic stabilities of a moving beam are investigated.<br/>
Spectral Element Analysis for an Axially Moving Viscoelastic Beam
Hyungmi Oh,Jooyong Cho,Usik Lee 대한기계학회 2004 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.18 No.7
In this paper, a spectral element model is derived for the axially moving viscoelastic beams subject to axial tension. The viscoelastic material is represented in a general form by using the one-dimensional constitutive equation of hereditary integral type. The high accuracy of the present spectral element model is verified first by comparing the eigenvalues obtained by the present spectral element model with those obtained by using the conventional finite element model as well as with the exact analytical solutions. The effects of viscoelasticity and moving speed on the dynamics of moving beams are then numerically investigated.
수학교사 연수에서 협력적 멘토링의 실제 -"함께 만들어가는 수학교사 연수"의 사례를 중심으로-
조형미 ( Hyungmi Cho ),권오남 ( Oh Nam Kwon ),이지연 ( Jiyeon Lee ),윤정은 ( Jeong Eun Yoon ) 한국수학교육학회 2015 수학교육 Vol.54 No.3
This research is the case study of collaborative mentoring in the professional development of multi-tiered mathematics teacher community. We observed the procedures of mentoring, and contents of mentoring in PD program. For this purpose, we implemented PD program with participant unit composed of 3 or 4 teachers in the same school and total 25 teachers from 4 elementary schools and 4 high schools. Also there were 1 mentor and 1 sub-mentor to support each school. Observed mentoring processes were all recorded and the participants not only were interviewed several times but also wrote reflection notes after meetings. While mentoring PD program was implemented, mentor and mentee had joint responsibility about lessons implemented by mentee. Furthermore It showed possibility of change of teacher learning culture, learning culture of community. It means that teacher would improve their professionalism more effectively within teacher community instead of individual. 4 reflection contents was founded in collaborative mentring; 1)purpose of mathematics education, 2)motivation and connection between previous lecture and present lecture 3)lack of mathematical contents in lesson 4)discourse between teacher and students.
오형미(Hyungmi Oh),임우철(Woochul Lim),이종원(Jongwon Lee),윤양원(Yangwon Yoon) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Airbag and seatbelts are an effective system to protect occupant during impacts. The airbag is inflated by an inflator. Roughly speaking there are three classes of inflators: pyrotechnic, compressed gas, and hybrid inflators. In pyrotechnic inflators the propellant is the only source of gas. Compressed gas inflators contain highly-compressed gas. And hybrid inflators also contain highly-compressed gas with propellant. To protect passengers during lateral impacts, the airbag is required to inflate rapidly. Time to first gas of side inflator is required in USCAR specification. The TTFG is 2ms for side inflators. In this study we design rupture discs that concentrate of highly-compressed gas’s behavior of the hybrid inflator. And we compare to test results of the pneumatic burst pressure and operating burst pressure.
모바일 환경에서 고압축 비디오의 화질향상을 위한 후처리 기법
박형미(Hyungmi Park),김민정(Minjeong Kim),이정은(Jeongeun Lee) 한국정보과학회 2005 한국정보과학회 학술발표논문집 Vol.32 No.1
본 논문은 MPEG-4 기반의 모바일 비디오 서비스 환경에서 발생하는 화질열화 현상의 하나인 블록킹 현상을 제거하는 기법을 제안한다. 제안된 기법은 전처리 과정과 3가지 모드의 디블록킹 필터 및 후처리 과정으로 구 성되어 있으며 각 모드는 블록경계의 특성에 따라 적용된다. 모드 1은 블록경계의 양쪽 모두가 평탄한 경우에 해당하며 가장 강한 필터를 적용한다. 모드 2는 블록경계의 한쪽만 평탄한 경우이고 이때는 비대칭 필터를 적 용한다. 모드 3은 블록경계를 중심으로 양쪽 모두 복잡한 경우이고, 이 경우에는 블록경계의 주파수 특성을 고 려하여 화소값을 보정한다. 전처리 과정에서는 각 필터의 모드를 올바르게 선택하도록 블록 내부의 불필요한 신호를 제거하고, 후처리 과정에서는 대각선 에지와 블록의 모서리가 만나는 경우 발생하는 corner outlier를 제거하여 주관적 화질을 향상시킨다. 실험결과에서 제안한 방법이 PSNR 관점에서 후처리 과정을 거치지 않는 비디오의 경우와 비교하여 약 0.7dB, MPEG-4 디블록킹 결과와 비교하여 약 0.4dB 향상됨을 보인다.
Novel JAK1-selective benzimidazole inhibitors with enhanced membrane permeability
Kim, Hyungmi,Kim, Mi Kyoung,Choo, Hyunah,Chong, Youhoon Elsevier 2016 Bioorganic & medicinal chemistry letters Vol.26 No.14
<P><B>Abstract</B></P> <P>The previously identified Janus kinase 1 (JAK1)-selective inhibitor, 1-(2-aminoethyl)-2-(piperidin-4-yl)-1<I>H</I>-benzo[<I>d</I>]imidazole-5-carboxamide (<B>2</B>), suffered from low cell permeability, which resulted in poor pharmacokinetic properties. In this study, by introducing less polar hydrogen bond donors at <I>N</I> <SUP>1</SUP> (a hydroxyalkyl or a methylaminoalkyl group) and C2 (a cyclohexanol group) positions, a series of novel benzimidazole derivatives were prepared, which exhibited selective JAK1 inhibitory activity (IC<SUB>50</SUB> against JAK1=0.08–0.15μM; JAK1-selectivity=26–40 fold vs JAK2, 12–23 fold vs JAK3, and 38–54 fold vs Tyk2) along with significantly increased lipophilicity (3.3–15.8 times) as well as membrane permeability (6.3–12 times).</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
이동하는 점탄성 보의 스펙트럴 요소모델링 및 동역학 해석
오형미(Hyungmi Oh),김도연(Doyeon Kim),이우식(Usik Lee) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
In this paper, the spectral element model is derived for the vibration and stability analyses of an axially<br/> moving viscoelastic beam subjected to axial tension. The viscoelastic material is represented by using a onedimensional<br/> constitutive equation of hereditary integral type. The accuracy of the present spectral element<br/> model is first verified by comparing the eigenvalues obtained by the present spectral element model-based<br/> SEM with those obtained by the exact theory and the conventional FEM. The effects of viscoelasticity on the<br/> vibration and stability of an example moving viscoelastic beam are numerically investigated.