• Wind and Structures
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• 제23권3호
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• pp.211-229
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• 2016

In recent years, the frequency and duration of supply interruption in electric power transmission system due to flashover increase yearly in China. Flashover is usually associated with inadequate electric clearance and often takes place in extreme weathers, such as downbursts, typhoons and hurricanes. The present study focuses on the wind-induced oscillation of conductor during the process when a downburst is passing by or across a specified transmission line. Based on a revised analytical model recently developed for stationary downburst, transient three-dimensional wind fields of moving downbursts are successfully simulated. In the simulations, the downbursts travel along various motion paths according to the certain initial locations and directions of motion assumed in advance. Then, an eight-span section, extracted from a practical 500 kV ultra-high-voltage transmission line, is chosen. After performing a non-linear transient analysis, the transient displacements of the conductors could be obtained. Also, an extensive study on suspension insulator strings' rotation angles is conducted, and the electric clearances at different strings could be compared directly. The results show that both the variation trends of the transient responses and the corresponding peak values vary seriously with the motion paths of downburst. Accordingly, the location of the specified string, which is in the most disadvantageous situation along the studied line section, is picked out. And a representative motion path is concluded for reference in the calculation of each string's oscillation for the precaution of wind-induced flashover under downburst.

• 항공우주시스템공학회지
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• 제13권2호
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• pp.26-33
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• 2019

인공위성 구동기로 사용되는 제어 모멘트 자이로(CMG)는 자신의 김블을 조종하여 큰 토크를 생성한다. 각각의 김블은 고속으로 회전하는 휠을 받치고 있기 때문에 휠의 질량 불균형은 외란을 발생시키게 되고 위성의 자세제어 성능을 저하시킨다. 따라서 구동기 고장을 대비하기 위해 외란을 진단하고 식별할 필요가 있다. 외란을 진단하기 위해 상태 관측기를 이용한 방법을 적용하였다. 본 논문에서는 2차 슬라이딩 모드 관측기를 이용하여 CMG의 단일 외란/고장을 탐지하였다. 또한 4개의 CMG가 설치되어 있는 위성 시뮬레이터를 이용하여 이 알고리즘을 검증하였다.

• 한국엔터테인먼트산업학회논문지
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• 제14권5호
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• pp.147-158
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• 2020

이 연구의 목적은 개정 누리과정의 유아중심, 놀이 중심 활동과 관련하여 어린이집과 유치원에서 보드게임 활용의 적절성에 대한 근거를 확인하고, 영역별 활동사례를 통해 유아용 보드게임 활용에 대한 기초 자료를 마련하는 것이다. 이를 위해 먼저 유아교육현장의 보드게임 활용의 이론적 근거로서 첫째, 발달에 적합한 실제에 근거하여 구체물을 사용한 놀이활동으로써의 가치, 둘째, 게이미피케이션 요소인 경쟁과 보상을 통한 유아의 자발적 참여와 몰입, 셋째, 누리과정 전 영역에 걸친 통합적 경험을 제시하였다. 다음으로, 누리과정에 기초한 유아용 보드게임의 통합적 활동사례를 신체운동·건강, 의사소통, 사회관계, 예술경험, 자연탐구의 영역별로 살펴보고, 활동과정에서 나타난 장단점과 유의점을 검토하였다. 이 연구는 유아교육현장에서 보드게임을 활용한 놀이활동의 가능성과 시행 방향에 대해 논하고, 이를 기반으로 유아교육현장의 보드게임 활동 구성 및 새로운 보드게임 콘텐츠 개발을 위한 시사점을 제공하였다는 의의를 가진다.

• Journal of Forest and Environmental Science
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• 제38권4호
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• pp.219-228
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• 2022

This study examined the relationship between the number of forest fires and days with no rainfall based on the national forest fire statistics data of the Korea Forest Service and meteorological data from the Open MET Data Portal of the Korea Meteorological Administration (KMA; data.kma.go.kr) for the last 30 years (1991-2021). As for the trend in precipitation amount and non-rainfall days, the rainfall and the days with rainfall decreased in 2010 compared to those in 1990s. In terms of the number of forest fires that occurred in February-May accounted for 75% of the total number of forest fires, followed by 29% in April and 25% in March. In 2000s, the total number of forest fires was 5,226, indicating the highest forest fire activity. To analyze the relationship between regional distribution of non-rainfall periods (days) and number of forest fires, the non-rainfall period was categorized into five groups (0 days, 1-10 days, 11-20 days, 21-30 days, and 31 days or longer). During the spring fire danger season, the number of forest fires was the largest when the non-rainfall period was 11-20 days; during the autumn fire precaution period, the number of forest fires was the largest when the non-rainfall period was 1-10 days, 11-20 days, and 21-30 days, showing differences in the duration of forest fire occurrence by region. The 30-year trend indicated that large forest fires occurred only between February and May, and in terms of the relationship with the non-rainfall period groups, large fires occurred when the non-rainfall period was 1-10 days. This signifies that in spring season, the dry period continued throughout the country, indicating that even a short duration of consecutive non-rainfall days poses a high risk of large forest fires.

• 문화기술의 융합
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• 제7권4호
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• pp.503-510
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• 2021

본 연구는 임상실습을 경험한 간호대학생의 표준주의 지식, 수행도 및 간호전문직관을 확인하고 간호전문직관에 영향을 미치는 요인을 확인하고자 수행되었다. 연구대상자는 2개 지역의 6개 대학에서 205명 간호대학생을 대상으로 선정하였고, 자료는 2021년 9월 7일부터 9월 17일까지 자가보고식 질문지를 활용하여 온라인 조사를 통해 모집하였다. 연구결과 표준주의 지식 점수는 30점 만점에 24.69점이고, 표준주의 수행도는 평균 3.70점(4점 척도), 간호전문직관은 평균 4.12점(5점 척도)으로 나타났으며, 간호전문직관에 영향을 미치는 요인은 성별, 표준주의 지식 및 수행도로 나타났고, 13.1%의 설명력을 나타냈다. 결론적으로 본 연구는 표준주의 지식과 수행도를 향상시켜서 긍정적인 간호전문직관을 확립하기 위한 임상실습교육 프로그램이 필요하다.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제29권3호
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• pp.17-28
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• 2023

Purpose: This study aims to provide basic data for the future construction plans of the Infectious Disease Hospitals by analyzing the area composition and required room ratios in the wards and ICU of currently under-construction infectious disease hospitals. Methods: 3 Methods have been used in this paper. 1) This study conducted a literature review on major considerations and related guidelines for hospitals specializing in infectious diseases using existing data. 2) Based on the objects and activities of the hospital space, zones and areas were set for each department according to infection control. 3) Based on the established zones and areas, basic plan drawings of three hospitals specializing in infectious diseases currently under construction were collected and architectural drawing analysis was performed. Results: 1) Infectious Diseases Hospital must have a spatial organization that can accommodate patient isolation, infection control, efficiency of medical service, and changes. 2) Zones for infection control are divided into negative pressure and non-negative pressure zones based on airborne precaution isolation. It is divided into clean and contaminated zone according to class of cleanliness by Aseptic technique. Areas are classified by objects (patients, healthcare workers, supplies) and activities (access, medical treatment, support), and a system for organizing space is established based on this. 3) By analyzing the area composition of each departmental area, each required room, and each required space in the wards and intensive care units, it provides basic data for the spatial organization for architectural planning of the infectious disease hospital. Implication: It can be used as basic data when planning related facilities by analyzing the characteristics of the space plan of the required room according to the relationship between activities, movement lines, and operation plans based on user behavior.

• Membrane and Water Treatment
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• 제14권2호
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• pp.85-93
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• 2023

Membrane separation is widely used for several applications such as water treatment, membrane reactors and climate change. Cross-linked organic-inorganic hybrid polyvinylidene fluoride (PVDF) / Tetraethyl orthosilicate (TEOS) was adopted for the preparation of optimized hollow membrane (HFM) for membrane distillation or other low pressure separators for mechanical properties and permeability under varying pretreatment schemes. HFMs were prepared on semi-pilot membrane fabrication system. Novel adopted post-treatment schemes involved soaking in glycerol, magnesium sulphate (MgSO₄), sodium hypochlorite (NaOCl), and isopropanol for different durations. All fibers were characterized for morphology using a scanning electron microscope (SEM), surface roughness using atomic force microscope (AFM), elemental composition by examining Energy Dispersive Spectroscopy (EDS), water contact angle (CA°) and porosity. The performance of the fibers was evaluated for pure water permeation flux (PWF). Post-treatment with MgSO₄ gave the highest both tensile modulus and flux. Assessment of properties and performance revealed comparable results with other organic-inorganic separators, HF or flat. In spite of few reported data on post treatment using MgSO₄ in presence of TEOS, this proves the potential of low cost treatment without negative impact on other membrane properties. The flux is also comparable with hypochlorite which manifests substantial precaution requirements in actual industrial use.The relatively high values of flux/bar for sample treated with TEOS, post treated with MgSO₄ and hypochlorite are 88 and 82 LMH/bar respectively.

• 치위생과학회지
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• 제5권4호
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• pp.171-177
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• 2005

본 연구는 어머니의 사회경제적 특성과 어머니의 구강보건지식 및 행동이 치과의료이용경험과 이용목적에 미치는 영향을 분석하고자 서울특별시에 소재한 2개의 어린이집에 내원하는 만 5-6세 유아를 자녀로 둔 103명의 어머니를 대상으로 설문조사를 실시하여 분석한 결과, 다음과 같은 결과를 얻었다. 1. 어머니의 이용목적에 따른 치과의료이용경험율은 치료(56.7%), 정기검진(23.3%), 예방(20.0%)순으로 나타났다. 2. 어머니의 사회경제적 특성 및 구강보건지식과 치과의료이용경험과의 상관성은 유의한 차이가 없었으나, 어머니의 구강보건행동과의 상관성은 치실 사용율이 낮을수록 치과의료이용경험율이 높게 나타났다(p < 0.01). 3. 어머니의 사회경제적 특성과 치과의료이용목적과의 상관성은 연령별 33-35세군(71.4%)에서, 학력별 대졸군(57.1%)에서 정기검진목적 치과의료이용경험율이 높게 나타났다(p < 0.05). 4. 어머니의 구강보건행동과 치과의료이용목적과의 상관성은 치실사용율이 높을수록 정기검진목적 치과의료이용경험율이 높게 나타났고(p < 0.001), 불소함유치약 사용율이 높을수록 치료목적 치과의료이용경험율이 높게 나타났다(p < 0.05). 5. 치과의료이용경험을 종속변수로 한 다중회귀분석 결과는 설명변량 65%로, 월평균소득(250만원 이하)이 유의미한 설명요인으로 나타났으며, 치과의료이용목적을 종속변수로 한 다중회귀분석에서는 정기검진의 경우 설명변량은 70%이였으며, 직업(전문직), 연령(33-35세)이 유의미한 설명요인으로 나타났고, 예방목적의 경우 설명변량은 78%이였으며, 연령(33-35세), 월평균소득(250만원 이하)이 유의미한 설명요인으로 나타났으며, 치료목적의 경우는 설명변량 33%이였으며, 연령(32세 이하)이 유의미한 설명요인으로 나타났다.

• 농촌의학ㆍ지역보건
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• 제31권1호
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• pp.21-34
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• 2006

식품위생에 관한 지식은 식중독의 예방여부, 냉동 냉장식품 보관법, 유통기한 경과 제품처리에 대해서는 조사대상의 87.9%-94.4% 정도가 정확히 알고 있었으나, 식중독의 원인 주요 예방법, 냉장고 보관온도에 대해서는 조사대상의 56.0%-63.0% 정도가 바르게 알고 있었다. 위생지식에 대한 정답률이 낮은 남성, 40대 이외의 연령층, 학력이 낮은, 종업원이 음식조리자인 경우에 대한 지속적인 위생교육이 필요 필요할 것으로 생각되고, 위생교육 미이수자가 위생지식에 대한 정답률이 높은 것으로 보아 교육내용 방법에 대한 개선이 필요하겠다. 위생수준 개선의 필요성에 대해서는 조사대상의 83.6%가, 건강진단의 필요성에 대해서는 조사대상의 78.6%가, 위생교육의 필요성에 대해서는 조사대상의 76.4%가 필요하다고 응답하였다. 위생수준이 미흡한 이유로 영업주의 위생의식이 미흡하여서가 조사대상의 71.6%로 가장 높았고, 개선해야 될 분야에는 업소시설 등 환경위생이 조사대상의 36.7%로 가장 높았다. 위생교육에서 가장 필요한 교육내용으로는 조사대상의 35.7%가 음식의 위생적 품질관리라고 하였고, 29.5%가 전반적인 식품위생의 개요라고 하였으며, 17.7%는 주변환경 및 주방시설의 위생적 취급이라고 응답하였다. 식품위생법 위반시 조사대상의 81.0%는 즉시 시정한다고 응답하였으며, 학력이 높을수록 즉시 시정하겠다는 응답이 많았다. 위생개선을 의해 행정기관에 바라는 점은 조사대상의 73.2%가 시설 및 운영자금지원을 지적하였고, 주기적인 위생교육이 19.3%, 위생공무원의 현지지도가 6.2%였다. 위생실천 실태에서는 위생복 착용률은 31.1%였으며, 조리시에 손을 씻지 않거나 그냥 물로만 씻는 경우가 각각 3.2%, 36.2%였고, 개인위생을 잘 준수한다는 43.7%로서 실천이 제대로 되지 않는 것으로 조사되었다. 이상의 결과로 미흡한 식품접객업소의 위생상태 개선을 위해서는 행정기관의 제도적 보완과 금융지원, 영업주의 직업에 대한 자긍심고취, 위생교육기관의 실효성 있는 위생교육프로그램의 개발 및 교육이 집중적으로 이루어져야 할 것으로 사료된다.

• 보건교육건강증진학회지
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• 제15권1호
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• pp.79-95
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• 1998

The purpose of this study was to investigate the sanitation affairs of general restaurants. The questionnaire survey on the attitude and knowledge toward sanitation, the attitude for sanitary administration and the sanitary education was conducted against new 600 restaurateurs who were educated from June 20 to July 11, 1996, at the administration hall's division of Kyungsangbook-do in charge of food industry that offered regular sanitary education to new restaurateurs annually. And the visit survey on sanitary practice was also conducted over 93 restaurateurs who obtained the commercial license for food service business. The findings from the survey were as follows; In regard to food sanitation, some 87.1 to 88.3% got the right knowledge about the reason and precaution of food poisoning, food's frozen or cold-storage, and the disposal of products after expiration of validity term. But it was about 20.8% to 50.0% who knew right about major precaution, storage temperature in refrigerator, fermented milk product's storage temperature and validity term. There was therefore a necessity for education in food sanitation. 38.2% of the subjects placed an emphasis on sanitary storage of foodstuffs as the most important thing in sanitary management. 33.8% emphasized cooking sanitation. The environmental sanitation was counted as the most important thing by 19.2%, and personal sanitation of worker was counted by 8.8%. There was differences in what they thought the most important thing was, according to the respondent's educational level and cooker. 86.6% replied it necessary to improve the sanitary level. The respondents who were younger or had better educational level emphasized more the need for it. Concerning health examination, 90.2% replied it necessary. 81.4% answered the reason was because there was a potentiality Quests might be infected with contagious disease. 78.5% pointed the need for sanitary education, but respondents with higher educational level less emphasized its needs. As the reason for poor sanitation, restaurateur's poor awareness about it was most frequently pointed out, by 46.9%. Cooking sanitation was most frequently counted, by 38.5%, as the first thing to be improved. As the most critical point in sanitary education, 34.5% indicated food's sanitary Quality control 30.9% mentioned sanitary treatment of kitchen facilities and peripheral environment, and 27.1% emphasized the summary of the general food sanitation. 77.7% answered to correct immediately in case of violating the Food Hygiene Law, and 12.0% replied to correct in the same case if they would get the order from public official or administrative action would be taken. Respondents with higher educational level answered more to correct immediately. What they wanted the government office to do toward sanitary improvement was a fund aid an facilities and management which was pointed out by 38.9%, a periodical sanitary education by 26.3% and a on-the-spot guidance of sanitary officials by 22.3%. In view of the food service business's sanitary practice, the rate of wearing a sanitary clothes was 32.9% in city and 35.0% in county. The rate of hand-washing without soap or non-washing at cooking was 73.9%, 85%, respectively. The rate of personnel sanitation was 34.2% in city and 50.0% in county. These things indicated the sanitation was not well practiced. To improve the poor sanitary conditions of the food service businesses, it is recommended to offer institutional backing and financial aid from administrative office, and encourage restaurateurs to take pride in their job. and conduct the sanitary education effectively by sanitary education institution.