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축열조 연동 Water-side Economizer 시스템의 동계 냉방 에너지 및 비용 절감 효용에 관한 연구
임완욱(Im, Wan-Uk),김유진(Kim, Yu-Jin),송영학(Song, Young-Hak) 한국건축친환경설비학회 2022 한국건축친환경설비학회 논문집 Vol.16 No.5
Air conditioning energy accounts for more than 50% of the total energy used in buildings. Recently, in general office buildings the cooling load of winter is increasing as it has a server room by establishing its own computer system for the purpose of managing computer and data and strengthening security. As the cooling load of winter increases, a study combining a TES (thermal energy storage) system that reduces operation costs by transferring power demand to late-night hours and a free-cooling system that reduces cooling energy consumption by using low-temperature outdoor air under conditions below a specific temperature is in progress. Therefore, this study intends to deepen the study by focusing on previous studies that implement a complementary model of each system for a building that is subjected to a 24-hour cooling load even in winter. By using DesignBuilder, a dynamic simulation program, cold water produced through WSE is used for 4 months during the winter (December to March) when the outside temperature is low to remove the load occurring at night. At the same time, in this study intend to implement a TES-linked free-cooling system that stores cold water in the TES and discharges heat during the next daytime, and the system will be referred to as a “Combination model”. Buildings and equipment were modeled with reference to ASHRAE standards and guidelines. For the target building, energy consumption and cost savings of cooling operation were reviewed using standard meteorological data of Seoul, and heating operation was excluded from the simulation model. As a result of analyzing the simulation, it was confirmed that the combined model reduced energy consumption by 27% and operating cost by 51% compared to the conventional method.
강섬유를 혼합 사용한 SHCC의 강도에 따른 겹침이음성능 평가
임희순(Im, Hee-Soon),김준수(Kim, June-Su),류승현(Ryu, Seung-Hyun),송영재(Song, Young-Jae),이영오(Lee, Young-Oh),윤현도(Yun, Hyun-Do) 한국구조물진단유지관리학회 2011 한국구조물진단학회 학술발표회논문집 Vol.15 No.1
This paper describes the performance of lap splice of D16 reinforcing bar on strain hardening cementbased composite(SHCC). The specimens had two types of compressive strength (30㎫ and 100㎫). Both types strengthened by hybrid fibers with polyethylene fiber(PE) and steel fiber(SF) and had 60 percent lap splice length of KCI code. The experiment evaluated tensile performance and cracking behavior of lap spliced specimens. It was found that high-strength SHCC had lower tensile strength than normal-strength SHCC. Comparison tensile performance of lap splice between high-strength SHCC and normal-strength SHCC implies that development of huge initial autogenous shrinkage of high-strength SHCC affected the lap splice performance.
무선통신 기반의 심박수측정기 Bodypro_PAPS(DS100)의 신뢰도와 타당도
김창환(Chang Hwan Kim),송영은(Young Eun Song),김병완(Byeong Wan Kim),이재정(Jae Jung Lee),임재형(Jae Hyeng Im),이홍우(Hong Woo Lee) 한국체육측정평가학회 2011 한국체육측정평가학회지 Vol.13 No.2
본 연구의 목적은 국내에서 개발한 무선통신 기반의 심박수측정기 Bodypro_PAPS(DS100; 두성기술, 한국)의 타당도와 신뢰도를 확인하는 것이다. Bodypro_PAPS(DS100)의 타당도를 확인하기 위한 준거장비는 Polar(T-31) 모델을 사용하였고, 연구 목적에 따라 준거장비와 개발장비 두 가지를 모두 피험자에게 착용시킨 후 운동부하검사(Bruce Treadmill Max Protocol)를 실시하였다. 신뢰도 확인은 피험자에게 Bodypro_PAPS(DS100)를 착용시킨 후 통제된 시간과 속도에 따라 2회 반복하여 걷거나 뛰도록 하였다. 연구의 대상은 대전시에 소재하고 있는 D대학교에 재학중인 남녀 학생 총 116명으로 타당도 검사 57명, 신뢰도 검사 59명이 참여하였다. 자료분석은 SPSS 16.0을 이용하여 상관분석을 실시하였고, 이때 통계적 유의수준은 α=.05로 설정하였다. 분석결과 Bodypro_ PAPS(DS100)의 타당도는 시간단위(1분간격)에 따라 r=.702(p=.001)에서 r=.989(p=.001) 사이의 값으로 나타났다. 또한 신뢰도는 시간단위(1분간격)에 따라 r=.511(p=.001)에서 r=.789(p=.001) 사이의 값으로 나타났다. 분석결과 Bodypro_PAPS(DS100)는 심박수측정기로 비교적 높은 타당도를 보였지만, 신뢰도는 중간정도 이상의 수준으로 확인되었다. The purpose of this study was to estimate reliability and validity of Bodypro_PAPS(DS100) which is the wireless heart rate monitor developed by South Korean corporation DU-SUNG technology. The criteria equipment to estimate the validity of Bodypro_PAPS(DS100) was polar(T-31) model, according to the purpose of this study Bruce Treadmill Max Protocol was implemented to subjects equiped both criteria equipment and developed equipment. With equipping Bodypro_PAPS(DS100) to subjects, the experiment with controlled time and speed was implemented twice by walking and running to estimate reliability of developed equipment. The subjects of this study were 116 male and female who were at D university in Daejeon. 57 participated in validity test and 59 participated in reliability test. The correlation analysis was implemented by using SPSS 16.0 to analyse data and the statistical significance level was set with α=0.5. The result of analysis related to the validity of Bodypro_PAPS(DS100) is from r=.702(p=.001) to r=.989(p=.001) according to the estimated time unit(1min). The result of analysis related to the reliability of Bodypro_PAPS (DS100) is from r=.511(p=.001) to r=.789(p=.001) according to the estimated time unit(1 min). The conclusion of this study is that Bodypro_PAPS(DS100) shows high validity relatively but reliability level of Bodypro_PAPS(DS100) is moderate as a heart rate wireless monitor.
중학교 수업에서 게임스포츠 모형의 적용에 따른 참여태도와 흥미도의 변화
홍성룡(Hong Sung-Yong),김창환(Kim Chang-Hwan),김재원(Kim Jae-Won),송영은(Song Young-Eun),임재형(Im Jae-Hyeng),김병완(Kim Byeong-Wan),조건상(Cho Gun-Sang),김범수(Kim Bum-Soo) 성신여자대학교 교육문제연구소 2012 교육연구 Vol.53 No.-
이 연구는 중학교 수업에서 게임스포츠 모형을 적용하여 학생들의 참여태도와 흥미도의 변화를 살펴보고, 학생들이 게임수업에 보다 흥미롭고 능동적으로 참여할 수 있도록 유도하기 위한 목적으로 실시하였다. 이를 위하여 대전광역시에 소재하는 중학교 2학년 4개 학급 118명을 대상으로 실시하여, 집단간의 차이를 분석하기 위해 이원반복측정 변량분석(two-way ANOVA with repeated measures)을 실시하였다. 이에 따른 연구결과는 첫째, 넷볼 게임수업에 참여한 학생들의 운동참여 태도에서는 부분적으로 차이가 있었다. 두 집단 모두 도전심 미적가치 운동의 실천에서 수업 전보다 수업 후에 평균점수가 더 높은 것으로 나타났다. 집단간 모형x반복의 상호작용 효과는 모든 변인 (체력 및 건강, 도전심, 미적가치, 경쟁 및 극기심)에서 나타나지 않았다. 둘째, 넷볼 게임수업에 참여한 학생들의 흥미도는 반복, 집단에 따라 통계적으로 유의한 차이가 나타났다. 두 집단 모두 수업 전보다 수업 후에 평균점수가 더높은 것으로 나타났고, 기능중심 게임수업 모형이 이해중심 게임수업 모형보다 더 효과적인 것으로 나타났다. 그러나 모형x반복의 상호작용효과는 없는 것으로 나타났다. The purpose of this study is to examine the change of participation attitude and interest of middle school students with application of game sports model and to lead the students to participate in the lesson more interestingly and actively. This examination was implemented to 118 participants in four classes, second year student, Daejeon. Two-way repeated ANOVA was carried out to analyze differences among groups. There are two results of analysis. First, in the view of participation attitude, participants of Net Ball showed slight difference partially. Both two groups showed higher average score than before the class in willings to challenge, aesthetic value, practical exercise. in all variables(health & fitness, willings to challenge, aesthetic value, competitive spirit and the spirit of self-denial), the interaction effects was not found between groups. Second, in the view of interest, participants of Net Ball showed statistically significant differences according to the repetition and groups. Both two groups showed higher average score than before the class and the function centered game sports model is conformed to be more effective than understanding centered game sports model. But, the interaction effects was not found between groups.