• 한국수학교육학회지시리즈C:초등수학교육
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• 제18권3호
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• pp.203-216
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• 2015

본 연구는 초등학교 6학년 수학 영재 학생을 대상으로 ACODESA 방법을 적용한 문제해결 과정에서 나타나는 표상 사용의 유형을 분석하였다. 수업 설계는 다양한 표상의 조직화된 사용을 강화시키는 ACODESA 방법에 따라 이루어졌으며 40분 동안 4차시에 걸쳐 수업이 진행되었다. 자료 분석을 위해 동영상 촬영, 학생과의 인터뷰 등을 수집하여 녹취록을 작성하였고, Despina(2011)의 표상 사용유형에 따라 표상의 변화를 분석한 결과 추가형, 정교화, 그리고 제한형이 나타났다. 이러한 연구 결과를 통해 문제해결 과정에서는 개인적 표상이 소그룹별 토론과 확인의 과정을 거쳐 제도적 표상으로 생성될 수 있는 수업 설계가 필요함을 알 수 있었다.

• Current Photovoltaic Research
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• 제5권1호
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• pp.25-27
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• 2017

Nanoscale textured black silicon has attracted intensive attention due to its great potential as applications in multicrystalline silicon-based solar cells. It absorbs sunlight over a broad range of wavelengths but introduces large recombination centers, non-uniform doping into cell. In this study, we present a metal-assisted chemical etching technique plus alkaline etching process to fabricate nanoscale pyramid structures with optimized condition. To make the structures, silver nanoparticles-loaded mc-Si wafer was submerged into $H_2O_2/HF$ solution first for nanohole texturing the wafer and textured wafer etched again with KOH solution for making nanoscale pyramid structures. The average reflectivity (350-1050 nm) is about 8.42% with anti-reflection coating.

• Nutritional Sciences
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• 제1권1호
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• pp.56-60
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• 1998

The present study was conducted to find out whether there are some differences in plasma carnitine levels among young-, middle-, and old-aged normal Korean women. Daily food intake, body fat content, plasma lipids and carnitine levels were measured in 153 samples from 44 young (20-24 years old), 49 middle-aged (30-49 years old), and 63 old (65-85 years old) normal volunteers. The differences in concentrations of nonesterified acylcarnitine and acid-soluble acylcarnitine were not statistically significant among them. However, acid insoluble acylcarnitine (AIAC) level in plasma decreased with age. Moreover, total carnitine (TCNE) level in the young group was significantally higher than in old and middle-aged groups. Body fat content in the young group was significantly lower than in old and middle-aged groups. Plasma total cholesterol increased with age and triglycerides in the old group were significantly higher than in young and middle-aged groups. These results suggest that the higher levels of AIAC and TCNE in the young group may be a reflection of their lipid metabolic state, which is different from middle-aged and old groups.

• 한국지구물리탐사학회:학술대회논문집
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• 한국지구물리탐사학회 1999년도 제2회 학술발표회
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• pp.92-116
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• 1999

전기, 전자 토모그래피는 전기적인 물성을 이용하여 지하의 고분해능 영상을 획득하는 방법이며 주파수에 의하여 전기비저항, 전자탐사, 레이다 토모그래피로 나뉘어진다. 이들 중 전기비저항, 레이다 토모그래피는 최근 들어 국내에서도 특히 지반조사 분야에서 활발하게 이용되기 시작하고 있다 본 논문에서는, 전기, 전자 토모그래피 법 중 국내에서 사용되는 전기비저항 토모그래피 및 레이다 토모그래피를 포함한 시추공을 이용한 레이다 탐사의 원리 및 적용에 대하여 국내의 탐사 사례를 중심으로 논하였다. 특히 시추공을 이용한 레이다 탐사의 방법론적인 접근에 있어서는, 방향탐지 안테나를 이용한 레이다 반사법 탐사법과 이방성 토모그래피 문제가 석산 탐사 및 지반조사 사례를 이용하여 논의되었다 한편 전기비저항 토모그래피에서는 각종의 전극 배열의 장단점이 논의되었으며, 전기전도도가 높은 시추공 공내수 내에 전극이 위치하기 때문에 발생하는 시추공 효과에 대하여 설명하였다. 대부분의 사례들은 알려져 있는 지질 정보, 시추코아 검층자료, 텔레뷰어 등의 자료와 비교하여 논의하였다.

• The Journal of the Acoustical Society of Korea
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• 제17권3E호
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• pp.27-34
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• 1998

The validity of the image model is investigated both analytically and experimentally in a half space with an infinite single reflecting surface present. This paper exploits the Sommerfeld integral that represents the exact solution for the reflected field in the half space. The solution is shown to be obtained by direct numerical integration which yields more accurate and stable results. The predicted results from the image model are compared to those from the direct numerical integration of the Sommerfeld integral. It is also experimentally demonstrated that the image model gives acceptably accurate results. It is of significance that this paper reveals analytical and experimental validation of using the image model except near-grazing incidence.

• 아동학회지
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• 제28권3호
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• pp.251-266
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• 2007

The Making-books Program(Byun, unpublished) uses the Arts PROPEL approach based on multiple-intelligences theory(Gardner, 1983). PROPEL is a loose acronym for production, perception and reflection, 3 stages in the learning process. The Making-books Program includes designing rubrics, making-books, and publishing. Effect of the program on creativity was examined by before- and after-testing by TTCT. Participants were 63 7-year-old children with 30 children in the experimental and 33 children in the control group. On the pre-test, there was no between groups difference in the participants' creativity on the TTCT. After 21 treatments, the effectiveness of the Making-books Program was shown by significant between group differences on the post-test.

• 한국정밀공학회지
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• 제19권2호
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• pp.160-170
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• 2002

Retroreflective article is different from other reflecting objects as it returns the incidence ray to the near of its source. This characteristic makes the retroreflectors have many applications in reflective highway signs, reflective vests, and other safety-relaxed items. These articles may have various shapes. However, the quantitative evaluation of performance for the best shape of retroreflector needs much time and cost for manufacturing prototypes and for performance experiments. In this work, we have developed a program for simulating the trace of ray entered into a retroreflective element, in order to determine the optimal shape of retro-reflection. We have also proposed new performance criterion of retroreflective articles, which can confide the range of incidence angle, instead of the criterion with the merely retroreflective strength.

• 중환자간호학회지
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• 제5권2호
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• pp.1-14
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• 2012

Purpose: This study was aimed to describe ethical dilemmas and types of coping behaviors among nurses who worked in intensive care units (ICUs). Methods: Data were collected by 2 focus group interviews with 12 ICU nurses in an academic affiliated hospital in Seoul, Korea. All interviews were tape-recorded and transcribed, and data were analyzed by modified qualitative content analysis. Results: Three themes emerged from the focus group interviews: "Respect for Persons (2 contents)", "Beneficence (13 contents)", "Justice (1 content)". Coping behaviors against the dilemmas were consultations with the doctors or colleagues, acceptance, guilt, reflection, forgetting, endurance, and frustration. Conclusion: The results of this study help us to understand ethical dilemmas that nurses experienced in ICUs and their coping behaviors. It would be useful to develop education programs for nurses in ICUs to support coping strategies for ethical dilemmas.

• 대한수학교육학회지:수학교육학연구
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• 제12권3호
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• pp.313-329
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• 2002

The importance of professor's outline in a feedback instruction was examined through various documents and the way in which the evaluation was fulfilled in Korean educational environment and its reflection upon the evaluation result were investigated by means of research. Based upon the survey results in connection with the progress and basis of teachers' on the spot feedback mathematics instruction in schools, it was found that most of teachers who engaged in feedback mathematics instruction were going over the most frequently missed problems. I proposed that we should bring up the point at issue and grasp its tendency of a class and entire group's results by means of a relative comparative analysis method, and thereupon establish a fixed category and choose substantial feedback scholarship according to that category. From this basis, the sub-sequent research topics include the substantial feedback effects of the selected problems that should be given priority, a group analysed and classified by means of comparison of tendency as well as feedback outline depended on students' characteristic, and the determining factors of tendency(a condition of professors, a level of students, geographical difference(s), and gender difference(s), etc...).

• 센서학회지
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• 제14권3호
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• pp.169-179
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• 2005

A multiplexed bend loss type single-mode fiber-optic sensor system was prepared to measure the displacement of several cm of the civil engineering structures such as many bridges, tunnels and various buildings. This bend loss type fiber-optic sensor used the signal difference between two reflection signals due to various bend losses generating at a pair of optical connectors by using OTDR (optical time domain reflectometer) for measuring displacements. And the experiments were conducted for showing the measurement feasibility on the range of 10 cm, and the multiplexing experiments were also performed to measure the displacements of 5 measuring positions of an object by setting these 5 fiber-optic sensors on a single mode fiber simultaneously.