• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2002년도 제18회 학술발표대회 논문초록집
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• pp.88-89
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• 2002

The aims of this study is to realize the structural design for development of a medium scale E-glass/epoxy composite wind turbine blade for a 750KW class horizontal axis wind turbine system. In this study, the various load cases specified by the IEC61400-1 international specification and GL Regulations for the wind energy conversion system were considered, and a specific composite structure configuration which can effectively endure various loads such as aerodynamic and centrifugal loads, loads due to accumulation of ice, hygro-thermal and mechanical loads was proposed. In order to evaluate the structure, the structural analysis for the composite wind turbine blade were peformed using tile finite element method(FEM). In the structural design, the acceptable blade structural configuration was determined through the parametric studies, and the most dominant design parameters were confirmed. In the stress analysis using the FEM, it was confirmed that the blade structure was safe and stable in any various load cases Moreover the safety of the blade root joint with insert bolts, newly devised in this study, was checked against the design fond and the fatigue.

• 천문학회보
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• 제36권2호
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• pp.116.1-116.1
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• 2011

L1448-MM, known as a class 0 YSO with a prominent outflow, was observed with the Photodetector Array Camera and Spectrometer (PACS) aboard Herschel Space Observatory by the key program, DIGIT (Dust, Ice, Gas in Time, PI: Neal Evans). The PACS covers various molecular and atomic line transitions such as CO, OH, $H_2O$, [OI], and [CII] at wavelengths from 55 to 210 ${\mu}m$. The line emission of $H_2O$, [OI], mid-J CO, and the OH fundamental transition distributes along the outflow direction although high-J CO and other OH emission peaks at the central spatial pixel. According to our excitation analysis, the CO gas has two temperature components: 300 K and 750 K, which are attributed to PDR and shock, respectively. However, the $H_2O$ gas with the rotation temperature ($T_{rot}$) of 200 K seems only affected by shock. Interestingly, the relative strength of OH transitions suggests the IR pumping process in L1448-MM. We also mapped L1448-MM in CO J=2-1 with the SRAO 6m telescope to compare with the FIR line transition maps.

• 대한조선학회논문집
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• 제48권2호
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• pp.171-177
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• 2011

Tensile tests were conducted at low temperatures for the steel materials which are used for outer shell of the vessels making transit through the polar regions. The selected steel materials were GL-DH32, GL-DH36 and GL-EH36. In comparison with the results at room temperature, the yield stress increases approximately by 10 to 13 percent at $-30^{\circ}C$ and by 13 to 19 percent at $-50^{\circ}C$ while the tensile strength increases about by 9 percent at $-30^{\circ}C$ and 11 to 14 percent at $-50^{\circ}C$. To obtain true stress-true strain, i.e. correct plastic hardening characteristics, Bridgman's(1952) necking correction formula was introduced taking triaxial state of stresses after onset of diffuse necking into consideration. Photographs of fractured surfaces were taken by using Scanning Electron Microscope immedately after tensile tests completed and one for GL-EH36 has been presented in this paper.

• 한국해양공학회지
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• 제37권5호
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• pp.215-224
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• 2023

While melting glaciers due to global warming have facilitated the development of polar routes, Arctic vessels require reliable anti-icing methods to prevent hull icing. Currently, the existing anti-icing method, i.e., the heating coil method, has disadvantages, such as disconnection and power inefficiency. Therefore, a carbon nanotube-based surface heating element method was developed to address these limitations. In this study, the numerical analysis of the surface heating element method was performed using ANSYS. The numerical analysis included conjugate heat transfer and computational fluid dynamics to consider the conduction solids and the effects of wind speed and temperature in cold environments. The numerical analysis method of the surface heating element method was validated by comparing the experimental results of the heating coil method with the numerical analysis results (under the -30 ℃ conditions). The surface heating element method demonstrated significantly higher efficiency, ranging from 56.65-80.17%, depending on the conditions compared to the heating coil method. Moreover, even under extreme environmental conditions (-45 ℃), the surface heating element method satisfied anti-icing requirements. The surface heating element method is more efficient and economical than the heating coil method. However, proper heat flux calculation for environmental conditions is required to prevent excessive design.

• 과학교육연구지
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• 제38권1호
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• pp.41-56
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• 2014

본 연구에서는 전북지역의 교육자원을 활용하여 토포필리아를 함양할 수 있는 STEAM 교육 프로그램을 개발하여 과학 캠프에 적용했다. 토포필리아는 고향의 장소와 구체물에 대한 어린 시절의 아름답고 행복한 애착과 그리움으로 학생들에게 긍정적 정서를 형성하고 학습동기로 작용할 수 있다. 고추장과 한옥마을, 마이산 역고드름, 최북의 예술을 학습소재로 하여 8개의 체험활동과 2개의 탐방 프로그램으로 총 32차시 STEAM 수업 자료를 개발했다. 특히 공감각의 미학적인 경험과 감성적인 체험의 기회를 제공하여 수업의 재미와 자발적인 학습, 의미부여의 과정을 강조했다. 개발 프로그램을 수업에 적용한 결과, 학생들은 과학을 더 잘할 수 있다는 내적인 자신감(4점 만점 중 2.5점)과 과학에 대한 관심과 즐거움(3.3점)이 향상되었다. 즐겁고 자기주도적인 수업 참여로 이루어진 행복한 경험들은 가치인식과 의미부여 학습을 통해 아름다운 추억을 형성했다. 수업에 참여한 93.3%의 학생들이 토포필리아 과학캠프를 다른 학생들에게 적극 추천하고 싶다고 했고, 프로그램 전반에 대한 만족도는 3.8점(5점 만점), 수업이 재미있고 흥미로웠다는 평가는 4.1점으로 긍정적인 평가를 받았다.

• 한국엔터테인먼트산업학회논문지
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• 제13권8호
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• pp.411-424
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• 2019

본 연구는 강원도민의 건강을 통한 삶의 질 향상은 물론 행복하고 즐거운 삶을 영위할 수 있는 실현가능한 스포츠복지 정책방향을 모색하는 것이 목적이다. 연구의 주요내용은 스포츠복지 개념 및 정책동향, 강원도 스포츠강좌이용권 사업 현황, 스포츠복지정책 방향 등 크게 세 부분으로 구성하였다. 스포츠강좌이용권 사업 중심의 강원도 스포츠복지 정책 방향으로는 다음과 같은 방향을 제시하였다. 첫째, 수요자 맞춤형 스포츠복지정책 추진이다. 이를 실현하기 위해, 스포츠강좌이용권 사업 고도화를 추진하여야 한다. 또한 생애주기별 보편적 복지로의 접근 강화 추진을 제안하였다. 둘째, 공공체육시설 활용과 다양한 프로그램 개발을 제안하였다. 강원도내 스포츠강좌이용권 사업 활성화를 위한 공공체육시설을 적극 활용할 것을 제안하였다. 또한 다양하고 차별화된 교육프로그램을 개발·보급하고, 수혜 대상자에게 효과적으로 전달하기 위해, 강원도체육회 또는 강원도 사회복지모금공동회에 「스포츠복지 관련 교육 프로그램」을 개설하고 「스포츠복지 전문가 육성」을 통해 스포츠복지 중요성에 대한 인식의 확산 도모, 「지역 스포츠복지 연구회를 구성하여 적극적인 활동을 지원토록 할 것을 제안하였다. 셋째, 인적자원 육성과 네트워크화이다. 이의 효율적인 추진을 위해, 「스포츠복지사 교육기관 설립」을 설립과 함께 전문가의 시각에서 스포츠복지 진흥 발굴 및 활용을 위한 「스포츠복지 연구·개발」 네트워크 구축 등을 제안하였다. 넷째, 제도 정비 및 지원체계구축이다. 이는 가칭 「강원도 스포츠복지추진위원회」의 구성, 행정지원체계의 일원화를 위해 단기적으로는 보건복지여성국 또는 문화관광체육국내에 가칭 「스포츠복지 사업 지원팀」 신설, 도내 인구학적 특성을 반영한 수요에 대응하여 장기적으로는 가칭 「강원도스포츠복지 지원센터」로 확대할 것을 제안하였다. 또한 강원도 지역 특성에 적합하고 전 도민이 혜택을 부여받을 수 있는 맞춤형 스포츠복지 실현을 위해서는 예산과 인력이 필요하기 때문에 「강원도스포츠복지 진흥 조례」 제정으로 법적 근거를 마련하고, 스포츠 복지진흥의 저변 확대를 목적으로 스포츠강좌이용권 사업을 보완한 가칭 「강원도 스포츠복지 경진대회」 개최를 추진할 것을 제안하였다.

• 복식
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• 제66권3호
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• pp.107-120
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• 2016

This study examines functions in traditional Korean special costumes in accordance with the climatic factors of the Korean peninsula. The study focused on clothes worn by commoners during the Joseon dynasty. Climate change has been a major global issue in recent times, and it has been a hot topic in social, cultural, scientific, economic, and industrial communities. Studies have been conducted regarding the rapidly changing climate, and finding ways to cope with unusual temperatures. This thesis studies the development of special costumes in preparation for unusual climates, and requirements of the costume in accordance with the climatic factors, as well as the direction of its development. Its biggest significance lies in collecting and organizing the research data on special costume studies, and on costumes of the commoners, which have been fairly insufficient up to this point. After the Little Ice Age, the Joseon Dynasty period faced poor external environment due to unusual temperatures. The results of studying the costumes of the commoners are as follows: The climate of the Korean peninsula displayed different characteristics depending on the season, so the form, material, and appearance of the seasonal clothing items showed clear differences, and the difference in the crops cultivated according to the climate led to difference in material and material preference shown in the costumes. This meant that costumes differed based on region. In addition, difference in social hierarchy, regulations on costume according to class, and farming oriented social background during the period of Joseon dynasty slowed the development of costumes of commoners, but appears to have had a positive effect on the development of special costumes. We anticipate more succeeding studies on costumes of the commoners and special costumes in the future. We hope more costumes that can wisely respond to the approaching changes in temperature in the Korean peninsula can be designed via modernization of traditional Korean special costumes.

• Journal of Nutrition and Health
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• 제9권4호
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• pp.28-35
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• 1976

To know changes of the food preferences and the practice of pica during pregnancy, ninety two women in the latter half of pregnancy were interviewed in April, 1976 at ten medical centers in Seoul. They were average 27.1 years old, and mostly middle class. 83.7% of the total subjects felt the changes of food preferences due to pregnancy within the first trimester. 60.9% had vomiting as well as losing their appetite and 17.3% vomited three or more times daily which might induce difficulties of water and electrolytes balance in body. The preferences about foods, the taste of foods, and various dishes cooked during morning sickness were changed significantly and showed in lower scores of likes and higher scores of dislikes than those before pregnancy. Particularly, cooked rice and kimchi indicated the increase of more than 50% in dislikes. The preferences after the morning sickness were turned back to those before pregnancy. Desire for water through foods like soft drinks, juice, ice cream, and gamju and salty foods seemed to be spontaneous during pregnancy. A majority of the subjects had three meals and no snack had included more snacks instead of meals during losing appetite and thereafter, had more frequent meals and snacks. Superstitions about chicken, squid, and cuttlefish for pregnant women were prevalent. 11.9% tabooed chicken because of harm for fetus. On the contrary, intended higher inclusions of milk, meat and dried small sardines would be helpful to satisfy the increased recommended allowances of calcium and protein for them. The practice of pica was found in 5.4% and rice was the only real item mentioned. Pica such as amylophagia or geophagia often reported in the U.S. was not answered in this study.

• 한국전기전자재료학회논문지
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• 제27권9호
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• pp.600-605
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• 2014

The interest in development on luminaires which are available up to $-52^{\circ}C$ is surging as demands in vessels navigating a north pole route increase. A conventional incandescent lamp used in vessels is operated stably at $-52^{\circ}C$, but many countries including Korea have eliminated the use of incandescent lamps gradually because of its low luminous efficacy. In this paper, therefore, to develop the LED luminaires with high-efficiency, long lifetime that enables to substitute for incandescent lamp, it has studied about cryogenic characteristics of LED packages, bulbs, driving circuit and power supply. This experiments were carried out according to standards IEC 60945-8.4.1. Temperature range is from $-60^{\circ}C$ to $25^{\circ}C$, and the light output depending on ambient temperature. It showed that, based on $25^{\circ}C$, light output of a CFL decreased by 80% of CFL at $-20^{\circ}C$ while each increased 12% of LED bulbs and 16~19% of LED packages at $-60^{\circ}C$.

• Ocean and Polar Research
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• 제36권4호
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• pp.319-326
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• 2014

Mineral dust in the polar snow plays an important role both in the climate system of the Earth and in global biogeochemical cycles. Analysis of the concentration and the particle size distribution of mineral dust has been carried out in the snow from the Antarctic surface snow and the Greenland snowpit. Among the various particle size determination techniques, a Multisizer 3 Coulter Counter in a class 100 clean bench counted all particles between 1.1 and $30.0{\mu}m$ with a $50{\mu}m$ aperture tube. The aperture tube size, the concentration of electrolytes and the accuracy of the particle size distribution were determined in this study. The number concentrations from the Antarctic surface snow were 81,843 particles $mL^{-1}$, but those from the Greenland snowpit were 10,666 particles $mL^{-1}$. In the volume distribution, the distributions of mineral dust in both the Antarctic surface snow and the Greenland snowpit showed lognormal distribution in the size interval 1.1 to $6.0{\mu}m$ with the mode, 3.562 and $3.836{\mu}m$, respectively. The analysis technique using a coulter counter for mineral dust could be used for reconstructing paleoclimates from polar ice cores.