유아교육기관의 통학버스 안전실태

심윤영,이재연 숙명여자대학교 아동연구소 2005 兒童硏究 Vol.18 No.1

The purpose of this study is to understand general safety of school buses and safety education at early childhood education center, analyze teachers' awareness and needs for safety of a school bus, and present fundamental data for teachers to protect young children against possible incidents at a early childhood education center. To grasp the conditions of safety of a school bus, safety education, and teacher's awareness and needs for the bus, a survey was conducted with 171 teaches who got on a school bus to bring in and out young children at kindergartens and child care center in Seoul area. The results of this study were as follows: First, as for safety of a school bus at early childhood education centers, young children used a school bus to attend a center and many buses had 15 to 25 seats at most early childhood education centers (70.3%). In terms of school buses, they were good at being insured, yellow vehicles, emergency network, and teachers' boarding but were poor at children protection mark attachment, observance of the seating capacity, and wearing a safety belt. Only about a half (54.4%) were registered as children protection vehicles; thus, young children could hardly be protected by the children protection vehicles. After investigating home-coming guidance for young children using a school bus at an educational center, teachers led young children to parents in most cases, while parents came out to send and meet them in a half of the cases; therefore, parents are required to change their perception of young children's safety. It was found to take about one hour a day on average for teachers to get on a school bus to young children. Second, in terms of safety training for a school bus at early childhood education centers, most centers (60.8%) provided parents about once or twice a year with information on the use of school buses in the form of newsletter. While young children's safety training for a school bus provided during regular classes and in need of safety guide for attending the center, there were difficulties due to the lack of educational materials related to safety training for a school bus and the want of concerns by the centers. Third, as for teachers' awareness and needs for safety of a school bus, teachers thought of a school bus as the center as relatively safe; however, nearly a half of the teachers failed to know the provision of children protection vehicles and penalties.

철판 2매 검출용 비젼시스템의 개발

심재창,권찬영 安東大學校 工業技術硏究所 1998 공업기술연구논문집 Vol.5 No.1

본 논문에서는 컴퓨터비젼과 레이저 조명을 이용하여 프레스에 투입되는 철판의 매수를 감시하는 시스템을 개발하고 인식 알고리즘을 제안하였다. 제안된 시스템은 조도, 진동 및 주변 환경이 열악한 현장에 적용할 수 있도록 조명으로 빔 레이저를 사용하였다. 약 1/4초 이내에 처리가 가능한 고속 인식 알고리즘을 구현하였다. 철판 매수 확인을 위해서는 철판 한 장의 평균 두께의 분포를 구하고 이 정보를 이용한다. 제안된 시스템을 자동차 부품을 제작하는 프레스의 앞단에 설치하여 운영해 본 결과, 철판이 프레스로 입력되기 직전에 두 장 이상의 철판이 겹쳐져서 입력되는 것을 사전에 방지할 수 있었다. In this paper, we developed an automatic steel plates counting system for a huge press, automobile parts production machine, using computer vision technique with beam laser. And we also proposed a fast recognition software algorithms. The steel sheet must be fed into the press only one sheet at a time. In case, if it is fed into two or more then the press will be broken. The proposed system has a new lighting system employing line beam laser. It can capture nearly same images in any condition such as day or night, with light or not, and vibration or not. Our recognition algorithm takes only 0.25 second per cycle. The average of steel thickness is used for counting the sheets of steel. We have installed the proposed system in front of the press machine in a factory. As a result, our system can prevent feeding into two or more steel sheets accidently.

CBD으로 제작한 In:Cd_(1-x)Zn_(x)S/CdTe 태양전지의 전기적 특성에 관한 연구

심재선,송우창,방영근,김남석,임창민,장현 三陟大學校 2006 論文集 Vol.39 No.-

CdS thin films have been widely used a window material in heterojunction solar cells. In solar cell systems, where CdS thin films have been proved to be useful, partial substitution of Zn for Cd increases the optical window of the hetero-junction and also the diffusion potential. In this thesis, effects of the thickness of indium films and the annealing temperature on structural, optical and electrical properties of chemically deposited CdZnS films for the efficiency of the Cd_(1-x)Zn_(x)S/CdTe solar cells were investigated. Cd_(1-x)Zn_(x)S films were grown by chemical bath deposition (CBD), which is a very attractive method for low-cost and large-area solar cells. The open circuit voltage of Cd_(1-x)Zn_(x)S/CdTe solar cells increased due to reduced electron affinity difference between Cd_(1-x)Zn_(x)S and CdTe films. However, the conversion efficiency of Cd_(1-x)Zn_(x)S/CdTe solar cell decreased because of the higher series resistance(R_(s)) than CdS/CdTe solar cell. The series resistance and conversion efficiency of Cd_(1-x)Zn_(x)S/CdTe solar cell were improved by using indium-doped Cd_(1-x)Zn_(x)S films as window layer. Cd_(1-x)Zn_(x)S/CdTe solar cells fabricated with optimal conditions exhibited V_(oc)=630mV, J_(sc)=38.89mA/㎠ , FF=0.53, and η=13.2%

Cathode materials of Li ion battery

심영재,문성인,형유업,도칠훈,윤문수 국립경상대학교 공과대학 부설 첨단소재연구소 1994 尖端素材 Vol.4 No.-

Li ion 2차전지는 높은 전지전압, 낮은 자기방전율, High Energy Density High Power Density Non-Toxic, No Memory Effect등의 우수한 특성을 보유하고 있고, 환경적인 측면에서 Lead Acid 전지 및 Ni/Cd 전지 등과 같은 Pb, Cd 및 Hg 등으로 인한 환경오염문제가 없는 고성능 신형전지로써, 92년에 SONY사에서 최초의 시제품을 내놓은 이래 현재 소형녹음기, 캠코더 및 셀룰라폰용으로 시판되고 있으나 세계적으로 Li ion 전지를 생산할 수 있는 회사는 일본의 몇몇 기업으로 한정되어 있는 실정이다.

Powre-MOSFET를 이용한 저·고 주파수 싸이크로 컨버터에 관한 연구

심재명,김영춘,조문택 한밭대학교 산업과학기술연구소 1993 논문집 Vol.1 No.-

The high frequency output from the general power converter causes harmonics, thereby raising various problems. The most common way to reduce harmonics used to PWM methods which may have some difficulties in heightening the output frequency. Under such a circumstance, this paper suggests a switching pattern of transfer function defining the switching turn-on time and the algorithm of transfer function which can create step square-waves in output one period, thus making it possible to continually transfer to the rage of 5〔Hz〕∼1.5〔Hz〕as well to reduce the harmonics.

전기자극이 성견 골결손부에 매식된 임플란트 주위조직의 치유에 미치는 영향

심재창,김영준,김옥수,정현주 전남대학교 치의학연구소 2003 구강과학 Vol.15 No.2

Several experimental studies showed that the application of small amounts of electric current to bone stimulated osteogenesis at the site of the cathode and suggested that electrical currents promote osseointegration around dental implants. The purpose of this study was to determine the effect of direct microcurrent to endosseous titanium implants placed in bone defects. The right and left 2nd, 3rd and 4th mandibular premolars in ten mongrel dogs (15kg of weight) were extracted. One month later, Ti-machined screw type implants(3.8 mm diameter×8.5 mm length, AVANA�, Ostem) were placed in surgically created circumferential defect area(width 5mm, depth 4mm). The implants were divided into three groups according to the treatment modalities: Control group- implants without electrical stimulation; Experimental group I- implants with allogenic demineralized freeze dried bone grafting and Experimental group Ⅱ- implants allogenic demineralized freeze dried bone grafting and electric stimulation. The animals were sacrificed in the 4th and 8th week after implant placement and un-decalcified specimens were prepared for histological and histometrical evaluation of bone-implant contact ratio (BIC) and bone formation area ratio (BFA) in defect area. Some specimens at 8 weeks after implantation were used for removal torque testing. Histologically, there were connective tissue infiltration in the coronal part of defect area in control and the experimental group I. whereas direct bone contact was found in the experimental group Ⅱ without connective tissue invasion. Average BIC ratios at 4 weeks of healing were 60.1% in the experimental group Ⅱ, 47.4% in the experimental group I and 42.7% in the control. Average BIC ratios at 8 weeks after implantation were 67.6% in the experimental group Ⅱ, 55.9% in the experimental group I and 54,6% in the control. The average BFA ratio was 84.0% in the experimental group Ⅱ, 71.8% in the experimental group I and 58.8% in the control at 4 weeks, and the BFA ratios were 89.6% in the experimental group Ⅱ, 81.4% in the experimental group I and 70.5% in the control at 8 weeks after implantation. The experimental group Ⅱ showed also significantly greater BIC and BFA ratios compared to the control and the experimental group I (p<0.05). The removal torque values at 8 weeks after implantation were 56 Ncm in the experimental group Ⅱ, 49 Ncm in the experimental group I and 43 Ncm in the control. There was a statistically significant difference among 3 groups(p<0.05) . These results suggest that electrical stimulation improve and accelerate bone healing around endosseous titanium implants in bone defect.

황산암모늄의 첨가가 산청 백색 카올린으로부터 알루미나의 용출에 미치는 영향

심영재,황규홍,배원태 慶尙大學校 工科大學 附屬 生産技術硏究所 1985 生産技術硏究所論文集 Vol.1 No.-

It were studied the effects of ammonium sulfate as additive, calcination temperature and amount of sulfuric acid for extraction of alumina from Sancheong white kaolin by wet acid process. DTA and XRD indicated that mixtures were decomposed completely at 550℃. Optimum condition for extraction of alumina were as follows. 1. 0.2-0.3 mole of ammonium sulfate to 1 mole of Al₂O₃in kaolin was suitable. 2. calcination temperature was 550℃. 3. 1%, 100cc of H₂SO₄was adaptable to l gr of kaolin. 4. Both α-and γ-Al₂O₃were obtainable. 5. Low-iron kaolin was adaptable to reduce contamination of Alumina from iron.

지도자의 리더십이 배구선수들의 성원만족에 미치는 영향

심재영,이창민,이경수 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.4

This study aimed at exploring what influence the trainers' leadership has on volley bell members' satisfaction, and in order to figure it out, the experiment of stratified random sampling was proceeded to 20 high schools teams, 7 university teams, and 5 industrial teams as objects for this study after selecting the population in the whole high schools, universities, and industrial players. Results was collected as follows. 1) Volley ball members' satisfaction according to the statistical characteristics of population It was shown that Members' satisfaction was estimated most high in male players for gender, industrial teams for team type, players under 3 years for playing experience and main players for playing position, However there is no significant difference among them. 2) Influence of leadership types on members' satisfaction Leadership classified as Training, Directing, Social Supporting, Democratic Behavior, Authoritative Behavior has positive correlation with the factors of satisfaction of members, such as task performance, social interaction, and coaching behavior, and has negative correlation with positive rewarding behaviors, Social Supporting among leadership types has much influence on players' task performance, and Training and Directing in social interaction and coaching behavior.

프로농구 관중의 관람유형과 경기장 유인 요인과의 관계

심재영,이창민,김태동,윤석민 한국스포츠리서치 2003 한국 스포츠 리서치 Vol.20 No.1

This study was to investigate the relationship between consuming behaviors and the enticing factors of sports arena. The independent variables of the study was royalty. The dependent variables were enticing factors including performance, status of reputation, facilities, and marketing factors. The subjects of the study were 470 randomly selected spectators who were present at 3 games, held in Wonju, Seoul, and Anyang among pro-basketball season games. The apparatus to collect data was 'the enticing factors of sports arena' and 'consuming behaviors' questionnaires(Cho Kwan-Hyung, 2000) which were revised and complemented based on four areas in spectator orientation(Marcum & Greenstein, 1985) and enticing factors of sports arena(Cronin & Taylor, 1992). Chi-square and One-way ANOVA were used to analyze the data by SPSS 10.0 for Windows(P<.05). The results of analyzing the relationship between royalty and the enticing factors of sports arena led to following conclusions. First, A companion type has a difference in accordance with a region, gender, age, presence of marriage, level of income, and occupation in statistics. A trait of buying a ticket has a difference according to a region, gender, and occupation in statistics. A trait of motivation to inspect has a difference in proportion to a region, gender, age, presence of marriage in statistics. Second, facilities factor was significantly different depended on companion orientation, which was one of the spectator orientation. There were not significant difference in inciting factors of sports arena according to method of ticket purchase and spectator motives.

서울 지역 사업체 급식의 위생 관리 수행 평가

심재영,엄애선,이헌옥 漢陽大學校 韓國生活科學硏究所 2002 韓國 生活 科學 硏究 Vol.- No.20

This study was conducted to investigate the sanitary management proceedings of the industry foodservice in Seoul area. Total 247 foodservice managers participated a survey and 159 participants among them were selected for analysis. Topics investigated include time-temperature and other sanitation, personal sanitation, and equipment-facilities sanitation. Foodservice managers responded were 27.3 years in average age and 2.4 years in duration of employment. 36.5% of participants employed service work and they mainly concerned sanitation within foodservice as a critical point (49.7%). Total mean score of sanitary management proceedings on HACCP was evaluated by 5-point scale. Time-temperature/etc. fall 3.91 out of 5.00, personal sanitation 4.02 out of 5.00 and equipment and facilities sanitation 3.85 out of 5.00. Of sanitary management proceedings, the 30-34 year old group had high score in time-temperature/etc. and equipment and facilities sanitation & the 25-29 year old group in personal sanitation, compared to other age groups. However, both were not significant(p>0.05). 95.6% of foodservice managers had sanitation checklist, and sanitary management proceedings were significantly(p<0.05) higher in personal sanitation than the group without checklist.