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고등학교 사회 수학 융합 프로그램이 수학 교과 태도에 미치는 효과성 분석
김형원,고호경 한국학교수학회 2017 韓國學校數學會論文集 Vol.20 No.3
본 연구는 고등학교 학생의 수학에 대한 가치 인식 및 흥미를 증진시키는 방안을 모색하 는데 일환을 두고 수행되었다. 이와 같은 교육적 목적을 달성하기 위해서는 단편적 교과 지 식의 학습 보다는 융합적인 접근을 통해 학생들이 자신의 지식을 적용할 기회가 제공되어야 한다는 주장에 따라 사회와 수학을 융합한 프로그램을 개발하고 그 적용 효과를 파악하고자 하였다. 효과성 검증을 위한 데이터 수집은 일반계 고등학교 학생들을 대상으로 사회 수학 프로그램 적용에 따른 사전 사후 설문을 통해서 이루어졌다. 사회 수학 프로그램은 실생활에 서 나타나는 사회적 현상을 수학적 관점에서 문제를 해결하고자 하는 시도로서, 적용 결과 학생들은 수학 학습 및 사회 학습에 대한 태도, 수학 학습 및 사회 학습 가치 인식에 효과적인 것을 확인할 수 있었다. The study in this paper considers how high school students’ attitudes toward and interest in mathematics could be promoted by conjoining the learning of ma thematics with the learning of social science topics. Survey instrument was dev eloped to measure student attitudes toward mathematics and social science subje cts and to evaluate student beliefs on learning mathematics embedded in social science topics. Data were collected from high school students in Korea by admi nistering pre- and post-tests: students were intervened with examples of math problems embedded in certain social contexts. The findings indicate that high sc hool students’ experience of solving mathematics problems embedded in social c ontexts positively affects the promotion of their attitudes toward and beliefs on both mathematics and social science subjects.
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상용 Gentoo 폴리머가 경화된 고체주입표면에서 물방울 거동
김형원,김정현 한국가시화정보학회 2024 한국가시화정보학회지 Vol.22 No.1
In this study, the behavior of water droplets on a solid-infused surface was evaluated by quantifying a water droplet's contact angle, sliding angle, and terminal velocity. The contact angle hysteresis and sliding angle of water on the solid-infused surface were measured to be lower than those of the hydrophobic PTFE surface. It led to the enhancement of the initiation of the water droplet’s movement. When the capillary number was lower than Ca < 0.004, the terminal velocity of the water droplet on the solid-infused surface was higher than the PTFE surface due to the low contact line resistance. However, the transition of the droplet morphology from a hemispherical shape to a streamlined teardrop shape beyond Ca > 0.004 lost the effect of reducing frictional resistance on the solid-infused surface.
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수지 노화와 잔류응력 변화가 Avimid? K3B/IM7 복합재 적층에 미치는 영향
김형원 한국군사과학기술학회 2005 한국군사과학기술학회지 Vol.8 No.3
In this paper, the effects of matrix hygrothermal aging and residual stress changes on Avimid?? K3B/IM7 laminates in 80℃ water were studied. The factors causing the 80℃ water to degradation of the laminates could be the degradation of the matrix toughness, the change in residual stresses. After 500 hours fully saturated aging of the neat resin, the weight gain was 1.55% increase with the diffusion coefficient 7×10-6m2/sand the fracture toughness was decreased about 41%. After 100 hours fully saturated aging of the [+45/0/-45/90]s K3B/IM7 laminates in 80℃ water, the weight gain was 0.41% increase with the diffusion coefficient 1×10-6m/s2 and the loss of the microcracking fracture toughness was 43.8% of the original toughness. To see whether the residual stress influenced the fracture toughtnes, two ply [90°/0°] laminates were put in 80℃ water from 2 hours to 8 hours. The changes in residual stress in 8 hours are less than 3MPa. Because the 3MPa change is not sufficient to degrade the laminates, the main factor to degrade the microcracking fracture toughness was the of the matrix fracture toughness.
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Avimid?? K3B/IM7 복합재료의 80°C 물에서의 노화현상
김형원 한국추진공학회 2005 한국추진공학회지 Vol.9 No.4
The Hygrothermal aging of the laminates of Avimid K3B/IM7 in 80°C water was studied as a function of immersion time prior to forming microcracks. The factors causing the 80°C water to degradation of the laminates could be the degradation of the matrix toughness, the change in residual stresses or the interfacial damage between the fiber and the matrix. The times to saturation in 80°C water for the laminates and for the neat resin were 100 hours and 500 hours. After 500 hours aging of the neat resin, the glass transition temperature was changed less than 1% by DSC test, and the weight gain was 1.55% increase with the diffusion coefficient 7x10-6 m/s2 and the fracture toughness was decreased about 41%. After 100 hours fully saturated aging of the [+45/0/-45/90]s K3B/IM7 laminates in 80°C water, the weight gain was 0.41% increase with the diffusion coefficient 1x10-6 m/s2. In 100 hours, the loss of the fracture toughness of the laminates was 43.8% of the original toughness by the microcracking fracture toughness criterion. Therefore, the main factor to degrade the microcracking toughness of the laminates could be the degradation of the matrix fracture toughness. 미세균열이 생기기 전 80°C 물속에서 침수시간에 따른 Avimid K3B/IM7 복합재의 습기노화 현상에 관하여 연구하였다. 80°C 물속에서 복합재의 파괴인성을 저하시키는 요인으로는 수지 파괴인성의 저하나 잔류응력의 변화 그리고 섬유와 수지 사이의 계면 손상이다. 80°C 물속에서 수지에 습기가 포화되는 시간은 500 시간이며 K3B/IM7 복합재에 습기가 포화되는 시간은 100 시간이다. 수지가 500 시간 가속노화한 후 DSC 시험을 한 결과 Tg는 1% 이내 증가하였으며, 무게는 7x10-6 m/s2 확산속도로 1.55% 증가하였다. K3B/IM7복합재에 관하여 물속에서 100시간 지난 후 무게는 1x10-6 m/s2 확산속도로 0.41% 증가했다. 500 시간 노화한 후 수지의 파괴인성은 41% 저하하였으며 100 시간 노화한 후 [+45/0/-45/90]s K3B/IM7 복합재의 미세균열 파괴인성은 43.8% 감소하였다. 그러므로 80°C 수분노화 시험에서 복합재 적층의 파괴인성을 감소시키는 주요 원인은 수지 파괴인성의 저하라고 할 수 있다.
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Patterns and Biologic Features of p53 Mutation Types in Korean Breast Cancer Patients
김형원,정준,이학민,황승현,안성귀,이경아 한국유방암학회 2014 Journal of breast cancer Vol.17 No.1
Purpose: The p53 gene is one of the most frequently mutatedgenes in breast cancer. We investigated the patterns and biologicfeatures of p53 gene mutation and evaluated their clinical significancein Korean breast cancer patients. Methods: Patients whounderwent p53 gene sequencing were included. Mutational analysisof exon 5 to exon 9 of the p53 gene was carried out usingpolymerase chain reaction-denaturing high performance liquidchromatography and direct sequencing. Results: A total of 497patients were eligible for the present study and p53 gene mutationswere detected in 71 cases (14.3%). Mutation of p53 wassignificantly associated with histologic grading (p<0.001), estrogenreceptor and progesterone receptor status (p<0.001), HER2status (p<0.001), Ki-67 (p=0.028), and tumor size (p=0.004). The most frequent location of p53 mutations was exon 7 andmissense mutation was the most common type of mutation. Compared with patients without mutation, there was a statisticallysignificant difference in relapse-free survival of patients withp53 gene mutation and missense mutation (p=0.020, p=0.006,respectively). Only p53 missense mutation was an independentprognostic factor for relapse-free survival in multivariate analysis,with an adjusted hazard ratio of 2.29 (95% confidence interval,1.08–4.89, p=0.031). Conclusion: Mutation of the p53 gene wasassociated with more aggressive clinicopathologic characteristicsand p53 missense mutation was an independent negativeprognostic factor in Korean breast cancer patients.
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