선택적 투과성면을 가진 직사각형 밀폐공간에서의 표면복사 및 자연대류해석

박대성,이택식,이준식,Park D. S.,Lee T. S.,Lee J. S. 대한설비공학회 1987 설비저널 Vol.16 No.2

A numerical study has been conducted on the combined radiation-natural convection heat transfer characteristics in a square cavity with a selectively transparent wall. The fluid in the cavity is assumed to be transparent to the thermal radiation. The effect of the wall emissivity is mainly considered in view of the temperature and flow fields. The comparison of the radiative heat flux and conductive heat flux variations along the isothermal wall is presented as well. The results show that the Nusselt number distribution is fairly uniform due to the com-pensative interaction of the radiation and convection heat transfer.

초등학생의 안전의식에 관한 연구

박대성,이영현,Park, Dae-Sung,Lee, Young-Hyun 한국응급구조학회 2004 한국응급구조학회지 Vol.8 No.1

This study selected the fifth and sixth graders of elementary school in Jeollanamdo who can express their opinions of safety consciousness and understand the items of questionnaire as the population. It selected 10 elementary schools under the supervision of Jeonnam Board of Education and sampled 700 students randomly from 2-3 classes in the 5th and the 6th grade. One preliminary survey was conducted to revise and complement the contents and forms of questionnaire with 70 students of a school from Apr. 1 to 6, 2004 and this study was conducted from Apr. 10 to 30, 2004. Data of this study were collected by explaining the purport of study to subjects after obtaining approval of principal and teacher of the school and distributing questionnaires. Total 700 questionnaires were distributed and 681 were collected (97%) and 602 were used for final analysis except 79 lacking responses. The results of this study are as follows. According to demographical characteristics of subjects, 'male' students were 302(50.%) and 'female' students were 300(49.8%) by sex and 'the 5th graders' were 285(47.3%) and 'the 6th graders' were 317(52.7%) in grade distribution. Residents at 'apartment house' were 406(67.4%) in residence type, 'going to school by foot' was 477 students(79.2%), 'high school graduates' were 297(49.3%) in fathers' education, 'high school graduates' were 366 (60.8%) in mothers' education, 'professional and office workers' were 231(38.4%) in fathers' job, 'full-time workers' were 283(47.0%) in mothers' job, and the number of siblings was one except myself in 343 students(57.0%). Respondents on the level of class showing 'good' were 340(56.5%) and those on the degree of adaptation to school life showing 'active' were 349(58.0%). On the characteristics related to safety education, 360(59.8%) responded it was 'very necessary', on the frequency of safety education at school for last one year, 339(56.3%) responded they had 'once or twice', on the frequency of safety education by parents, 279(46.3%) responded they 'often' had it, on the level of safety practice by parents, 347(57.6%) responded they practiced it 'frequently', on the source of knowledge of safety, 223(37.0%) responded they got it from 'parents, siblings and relatives', on the degree of recognizing the need of safety education textbooks, 295(38.5%) responded 'it was needed', on the recognition of necessity of teacher for safety education, 271(45.0%) answered it was very necessary', and on the recognition of qualification of teacher for safety education, 370(61.5%) answered it was 'paramedic'. The mean score of safety consciousness of subjects was 2.72 (SD. 21) of full score 3, having high score over mean score. According to each area, the area showing the highest safety consciousness was safety of fire(2.83), followed by home safety(2.76) and first-aid treatment(2.76), traffic safety(2.71), play and leisure safety(2.66) and school safety(2.56). Items showing statistical differences in the degree of safety consciousness according to demographical characteristics were sex(t=-3.11, p=.002), education(t=2.33, p=.021) and number of siblings(F=3.729, p=.011). In the difference of safety consciousness between both sexes, 'female' students(2.75) showed higher safety consciousness than 'male' students (2.69), and the former also showed higher safety consciousness than the latter in all six areas of school safety, play and leisure safety, traffic safety, fire safety, home safety and first-aid treatment, and there were statistical differences in the areas of play and leisure safety, traffic safety, fire safety and first-aid treatment. According to the differences of safety consciousness by grade, 'the fifth graders'(2.74) showed higher safety consciousness than 'the sixth graders'(2.70) and the former also showed higher safety consciousness than the latter in all six areas of school safety, play and leisure safety, traffic safety, fire safety, home safety and first-aid treatment, and

1급 응급구조사의 임파워먼트가 비판적 사고에 미치는 영향

박대성,Park, Dae-Sung 사단법인 한국응급구조학회 2008 한국응급구조학회지 Vol.12 No.3

Purpose : This study aimed to examine the effects of empowerment of the paramedics on critical thinking and provide the basic materials for the qualitative improvement of emergency medical service. Methods : This study collected data with the paramedics working at general hospital and hospital emergency room in G metropolitan city, B metropolitan city, U metropolitan city, D metropolitan city and J province from July 1 to 31, 2008. Total 180 questionnaires were collected and 152 were used for final analysis, and the following results were obtained through statistical analysis using SPSS 12.0 program. Results : 1) Average score of empowerment was 4.44 out of 6 and according to average score by areas, significance was 4.94, capacity 4.92, self-determination 4.28, and effective-ness 3.62. 2) Empowerment by general characteristics was statistically significant in age (F = 3.313, p < 0.05), the final scholastic attainments(F = 2.436, p < 0.05), and salary(F = 1.695, p < 0.01). 3) Average score of critical thinking was 3.12 out of 7 and according to scores by areas, maturity was highest as 3.71, followed by no prejudice as 3.70, systemicity as 3.14, pursuit of truth as 3.05, much curiosity as 2.93, critical thinking and self-confidence as 2.92, and analysis as 2.91. 4) Critical thinking by general characteristics was statistically significant in marital status (F = 15.695, p < 0.01) and the final scholastic attainments (F = 2.606, p < 0.05). 5) Correlations between empowerment and critical thinking showed positive correlations as Pearson's correlation coefficient r = 0.400 and positive correlation in all areas including empowerment and critical thinking were found (r = 0.116-0.710). 6) The effect of empowerment on critical thinking was statistically significant in p < 0.01 and was explained as $R^2=0.155$. In the effects of empowerment on critical thinking, significance, capacity and self-determination were statistically significant in p < 0.01, effectiveness in p < 0.05 and were explained as R2 = 0.244. Conclusion : From the above results, it was found that empowerment had the influence on critical thinking, so it was considered that hospital managers and emergency room chiefs must develop and operate education and training program based on the concept of empowerment, maintenance and management strategies.

산업폐수처리에 (産業廢水處理) 관한 연구

박대성,김광호,김형석,이종철,주흥규,홍사욱 ( Dai Sung Park,Kwang Ho Kim,Hyung Suck Kim,Jong Chul Lee,Heung Kyu Jhoo,Sa Uk Hong ) 한국하천호수학회 1971 생태와 환경 Vol.4 No.3·4

Survey on the treatment of waste water of factories according to the kinds of industries distributed in Yeong Deung Po, Seoul has been investigated. The results of this study were summarized as follows: 1. All of the waste water of factories were over the standard levels in preventive law of public nuisance. 2. Flocculation sedimentation method is most favorable in treatment of waste water from the textile factories. In textile with dyeing factories, it can not be desirable in treatment of waste water by the methods such as sand filtration, sedimentation, flocculation sedimentation and aeration. In the food factories, the methods of flocculation sedimentation followed with aeration can accomplish the object of treatment. In the paper factories, all the methods of sandfiltration, sedimentation and flocculation sedimentation can be applied but the flocculation sedimentation is especially most favorable among them. In the treatment of waste water from the fermentation factories, use of aeration after flocculation sedimentation method can reach the objects of treatment. 3. Degrees of relationships between determined values of treated water were calculated into coefficients of correlationships between each experimental items. Calculating the equations of regression, in the case of necessity, presuming the mean values of other experimental items from a certain experimental item, the range of judgement can be widen to the extent of experimental data of treated water which were experimented in few item and also the random data can be used in the judgement of normal value or not. 4. Instead of the complicated B.O.D., the turbidity of simple experimental items can be applied in food, fermentation, textile, paper and pharmaceutical tries.

건설현장 재해예방을 위한 안전관리제도 내실화 방안-재해예방 기술지도 중심으로

박대성,Park, Dae-Seong 한국건설안전협회 2006 建設 安全技術 Vol.35 No.-

기술지도제도는 전문기술인력을 활용하여 재해율이 높은 중ㆍ소규모 현장의 건설재해를 효율적으로 관리하기 위해 정부가 간접적인 안전관리 전문제도로 도입하였다. 하지만 IMF 이후 급격히 변화된 건설현장 안전관리 체계와 재해율 증가, 지도기관 업체의 난립과 부실한 지도업무수행 등으로 기술지도제도의 실효성에 많은 문제점이 발생하고 있다. 따라서 본 연구에서는 기술지도제도의 운영 실태와 관계 법령, 설문조사 자료를 분석하여 문제점을 도출한 후 제도 운영상의 개선 방안, 지도기관의 전문성 강화 방안, 자율적인 안전관리 유도 방안으로 구분한 내실화 방안을 제시함으로써 효율적인 재해예방대책으로서 기술지도제도의 신뢰성을 제고시키는데 그 목적이 있다.

광주지부

박대성,Park, Dae-Seong 한국건설안전협회 1996 建設 安全技術 Vol.20 No.-

건설현장 재해예방을 위한 안전관리제도 내실화 방안 : 재해예방 기술지도 중심으로

박대성(Park Dae Sung),김우(Kim Woo) 대한토목학회 2005 대한토목학회논문집 D Vol.25 No.4D

자동차 정비 훈련을 위한 JESS 기반 시뮬레이터

박대성(Dae-Sung Park),김준태(Juntae Kim) 한국정보과학회 2013 한국정보과학회 학술발표논문집 Vol.2013 No.11

관계 DBMS 기반 XML 저장시스템 상에서의 XML 뷰 인덱싱

박대성 ( Dae-sung Park ),김영성 ( Young-sung Kim ),강현철 ( Hyunchul Kang ) 한국인터넷정보학회 2005 인터넷정보학회논문지 Vol.6 No.4

질의 결과를 캐쉬한 후 후속 질의 처리에 사용하는 것은 중요한 질의 최적화 기법으로서 이에는 실체뷰 기법과 뷰 인덱싱이 있다. 관계 데이터베이스에 대하여 많이 연구된 이들 기법은 XML이 웹 상에서 데이터 교환의 표준으로 부각된 이래 최근 XML 데이터에 대해서도 연구되고 있다. XML 뷰 인덱싱은 XML 질의의 결과인 XML 뷰 xv를 XML 뷰 인덱스(XVI)라는 구조로 표현한다. XVI는 xv의 소스 문서 엘리먼트들의 식별자 및 xv에 대한 정보를 저장한다. xv에 대한 XVI는 XML 엘리먼트의 식별자만을 저장하지 엘리먼트 자체를 저장하는 것이 아니다. 따라서 xv가 요청되면 그것의 XVI를 통해 xv의 하부 소스 XML 문서에 대해 실체화(materialization) 과정이 수행되어야 한다. 본 논문은 XVI 관리 시스템과 관계 DBMS 기반의 XML 저장 시스템의 통합 문제를 다룬다. 제안된 시스템은 두개의 서로 다른 상용 관계 DBMS에 대하여 Windows 2000 Server 환경에서 각각 Java로 구현되어 XML 뷰 인덱싱을 통한 XML 질의 처리의 성능 향상 및 XML 뷰 인덱싱의 오버헤드 평가에 이용되었다. 성능 실험 결과 관계 DBMS 기반의 XML 저장 시스템 상에서 XML 뷰 인덱싱은 매우 효율적이며 그 오버헤드는 미미하다는 것을 확인하였다. Caching query results and reusing them in processing of subsequent queries is an important query optimization technique. Materialized view and view indexing are the representative examples of such a technique. The two schemes had received much attention for relational databases, and have been investigated for XML data since XML emerged as the standard for data exchange on the Web. In XML view indexing, XML view xv which is the result of an XML query is represented as an XML view index (XVI), a structure containing the identifiers of xv`s underlying XML elements as well as the information on xv. Since XVI for xv stores just the identifiers of the XML elements not the elements themselves, when xv is requested, its XVI should be materialized against xv`s underlying XML documents. In this paper, we address the problem of integrating an XML view index management system with an RDBMS based XML storage system. The proposed system was implemented in Java on Windows 2000 Server with each of two different commercial RDBMSs, and used in evaluating performance improvement through XML view indexing as well as its overheads. The experimental results revealed that XML view indexing was very effective with an RDBMS based XML storage system while its overhead was negligible.

Skeleton Array를 이용한 능동 위상배열 안테나 교정

박대성(Daesung Park),윤주호(Juho Yun),정윤권(Youn Kwon Jung),장동혁(Donghyeok Jang),황금철(Keum Cheol Hwang),최재훈(Jaehoon Choi) 한국통신학회 2020 韓國通信學會論文誌 Vol.45 No.11