주거건물의 급탕방식별 급수.급탕헤더시스템 적용방안에 관한 연구

차민철,제성호,석호태,Cha, Min-Chul,Je, Sung-Ho,Seok, Ho-Tae 한국주거학회 2008 한국주거학회 논문집 Vol.19 No.1

Hot water is used by having a wash, dishes, taking tub and drinking water in residential buildings, and the use objective is to raise comfort of human body sense, washing and sterilization effect and so on. Cold & hot water supply system is understanded simpler than HVAC systems relatively, so it is true that pace of performance improvement is slower than other systems for plan and technical development. In this study, the performance evaluations are conducted under the condition of composition ratio by 1:1 for cold & hot water supply manifold system using functionally complex valves such as constant flow regulating valve and 3-way mixing valve in the area of $105.6m^2$ apartment which consist of the largest part of the whole apartment. Also, flow rate related to simultaneous use of faucets and change of hot water temperature are compared with the existing method.

관망해석을 통한 주거용 건축물의 급수.급탕 헤더시스템 설계 방안에 관한 연구

차민철,석호태,김동우,Cha, Min-Chul,Seok, Ho-Tae,Kim, Dong-Woo 한국주거학회 2008 한국주거학회 논문집 Vol.19 No.5

The aim of this study is to present the design methods about manifold location being installed and size and to draw out the proper piping size as comparing the fluctuation of discharge with manifold size and residence size through the piping network analysis, when using the same faucet in accordance. The findings are summarized as follows, 1) an appropriate header main body pipe diameter was deemed to be $32{\sim}50\;mm$. 2) the research presented design measures for the application of appropriate water supply inlet pipe diameters according to residential buildings with various sizes. 3) the header direct branch piping method is ideal for small and medium-sized residential complexes, and the header branching and semi header methods are deemed to be more favorable for large residential complexes. 4) this study offered design measures for appropriate header system main body pipe diameters, water supply inlet pipe diameters, header system piping methods, application methods for functional auxiliary equipment units, and header system installation spaces and location.

관망해석을 통한 주거용 건축물의 급수ㆍ급탕 헤더시스템 설계 방안에 관한 연구

차민철(Cha Min-Chul),석호태(Seok Ho-Tae) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(계획계)

The aim of this study is to present the design methods about manifold location being installed and size and to draw out the proper piping size as comparing the fluctuation of discharge with manifold size and residence size through the piping network analysis, when using the same faucet in accordance. The findings are summarized as follows, 1) an appropriate header main body pipe diameter was deemed to be 32~50㎜. 2) the research presented design measures for the application of appropriate water supply inlet pipe diameters according to residential buildings with various sizes. 3) the header direct branch piping method is ideal for small and medium-sized residential complexes, and the header branching and semi header methods are deemed to be more favorable for large residential complexes. 4) this study offered design measures for appropriate header system main body pipe diameters, water supply inlet pipe diameters, header system piping methods, application methods for functional auxiliary equipment units.

주거건물의 개별급탕방식 환탕배관 적용에 따른 급탕성능 평가에 관한 연구

차민철(Min-Chul Cha),여명석(Myoung-Souk Yeo),석호태(Ho-Tae Seok) 대한설비공학회 2007 설비공학 논문집 Vol.19 No.12

In the current residential building, hot water supply system consumes the second largest energy in order to make the thermal comport condition of residential space. The more residential environment improves the more the demand for hot water and water consumption is increasing gradually. So this study examines the possibility of applying the recirculation for individual hot water supply system compared with the existing method for waiting time for hot water, wasted water and energy consumption. The results are as follows. (l) In case of recirculation system method the waiting time for hot water can be reduced up to 69~85% in spring and fall period and so dose up to 77~85% in winter period. (2) The total wasted water has a little change compared with the existing method which can make the total wasted water reduced about 77~86%. (3) The efficiency of hot water supply system can be improved, if the method which blocks the inflow of cold water is applied, when return pump is operated to recirculate hot water in recirculation system.

드론 조작 컨트롤러 인터페이스의 사용성 평가 방안

차민철(Min Chul Cha),김보명(Bomyeong Kim),이지인(Jiin Lee),지용구(Yong Gu Ji) 대한인간공학회 2016 대한인간공학회 학술대회논문집 Vol.2016 No.11

Objective: The aim of this study is to investigate the usability factors influencing drone controllers and suggest the usability principles for designing a drone controller. Background: Recent interest of drones has been developing over the years. This is why drones have been used in various fields such as agriculture, service, distribution and leisure, as well as the military. However, as the utilization and variation of drones has expanded, several problems and violations of privacy and the Aviation Act have also been committed through the use of these drones. One of the most critical problems is an accident due to an error of drone controllers. This is caused by the difference between human and machine. Method: We conducted a heuristic evaluation with experts in this filed. We reviewed prior studies on system controllers in order to investigate the usability factors influencing the drone controllers. Then, we conducted a card sorting method to categorize themes and factors related to drone controllers, and based on these factors, we conducted the user evaluation and interviews with 10 participants. Result: Nine factors and thirty-one problems influencing drone controllers were derived through heuristic evaluation. Ranking of usability factors was determined through user evaluation. Conclusion: Based on our results, perceived controllability and intuitiveness were the most important factors in accordance with drone controllers.

이중외피시스템의 차음성능 평가에 관한 연구 - 전면형 이중외피시스템을 중심으로 -

차민철(Cha Min-chul),곽현철(Kwak Hyun-chul),황재환(Hwang Jae-hwan),석호태(Seok Ho-tae) 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2

The purpose of this study is to evaluate the sound insulation performance and to present fundamental data for sound insulation plan about open and close windows of inner facade and outer facade of Double-skin Facade system applied to multi-layer type. The Headquarter of Green Building and the Energy Saving Building in the Korea Institute of Energy Research was selected for experiment. Measurement method which are specified in the Korea Standard 2235 were selected for this study. As the result of this study, 1) Sound insulation performance of Multi-layer type of Double-skin Facades is very excellent about outdoor noise. 2) Vertical level is higher, it shows that more decreases sound pressure level.

창의ㆍ인성 교육 관점에서 경쟁활동 영역수업전략의 교육적 의미 탐색

차민철(Min chul Cha),신기철(RKi cheol Shin) 성신여자대학교 교육문제연구소 2014 교육연구 Vol.61 No.-

본 연구는 창의ㆍ인성 교육 관점에서 초등학교 체육과의 경쟁활동 영역의 수업에 적용된 수업전략을 분석하고 그 교육적 의미를 해석하는 데 목적이 있다. 이를 위해 초등학교 체육과 경쟁활동 영역의 수업을 대상으로 참여 관찰과 심층 면담을 통해 자료를 수집하였으며, 경기장과 학습 집단 구성 및 체육교구의 활용 상의 수업전략이 어떠한 교육적 의미를 갖는지를 영역분석과 분류분석에 의거해 주제어로 도출하였다. 연구결과, 경기장 구성은 학습 효과를 높이기 위한 의도적 변형과 학생 주도의 구성 양상으로 나타났으며 '참여를 유도하는 시각적 도화선', '함께 참여하는 활동의 장', '게임에 대한 안목 형성의 채널 확대'라는 교육적 의미로 해석되었다. 학습 집단 구성은 참여 동기 확대와 다자간 대결의 집단 구성의 형태로 나타났고 '참여 동기와 자존감 형성', '경기 수행력에 대한 인식 변화', '지나친 경쟁 구도의 완화 장치'로 해석되었다. 마지막으로 체육교구의 활용은 대안적 자료의 활용 및 개발 형태로 나타났으며 '책임감 발현의 기회 제공'과 '새로움과 전통적 규약의 줄다리기'로 해석되었다. 연구 결과를 바탕으로 창의ㆍ인성 교육을 위한 경쟁활동 영역수업은 게임 수행을 중심으로 실시하되 학생의 주도적 참여를 유도하고 통합적인 관점에서 이루어져야 함을 논의하였다. The purpose of this study is to interpret the educational meanings of teaching strategies that applied in the competition activity instruction in physical education from the perspective of creativeness & character education. Data were collected through participant observation and in-depth interviews of four elementary school students, and then categorized by the domain analysis and taxonomic analysis. Teaching strategies mainly focused on the strategies of making up game filed, grouping students, and utilizing teaching tools. The results are like followings. First, the strategy of making up game filed showed two patterns as intentional variations to increase the learning effect and constructing game field by students. The educational meanings of this strategy was categorized as visual fuse leading participation, activity space with all participation, and expanding the channel forming the eye for games. Second, the strategies of grouping students also showed two shapes like expanding participating motivations and grouping for the multilateral game. The educational meanings of this strategy was categorized as forming motives and self-esteem, change of perception about game performance, and relaxation of exaggerative competition structure. Lastly, the strategies of utilizing teaching tools revealed two patterns as use of alternative materials and development of new materials. The educational meanings of this strategy was categorized as chance of revelation of responsibility and struggling between new and traditional norm. Based on the results, the discussion about the direction of competition activity class was presented.

주거건물의 급탕방식별 기능성 부속기기 일체화 헤더시스템 적용에 따른 성능 평가에 관한 연구

차민철(Cha Min-Chul),여명석(Yeo Myoung-Souk),석호태(Seok Ho-Tae) 한국건축친환경설비학회 2007 한국건축친환경설비학회 학술발표대회 논문집 Vol.- No.-

Hot water is used by having a wash, dishes, taking tub and drinking water in residential buildings, and the use objective is to raise comfort of human body sense, washing and sterilization effect and so on. Cold & hot water supply system is understanded simpler than HVAC systems relatively, so it is true that pace of performance improvement is slower than other systems for plan and technical development. In this study, the performance evaluations are conducted under the condition of composition ratio by 1:1 between hot water supply systems accounting for 59.4% of the entire apartment and cold & hot water supply manifold system using functionally complex valves such as constant flow regulating valve and 3-way mixing valve in the area of l05.6m2 apartment which consist of the largest part of the whole apartment. Also, flow rate related to simultaneous use of faucets and change of hot water temperature are compared with the existing method.

텍스트 마이닝 기반의 스마트폰 카메라 사진의 감성평가 연구

차민철(Min Chul Cha),임채린(Cherin Lim),심재문(Jae Moon Sim),김다영(Da Yeong Kim),지용구(Yong Gu Ji) 대한인간공학회 2021 대한인간공학회 학술대회논문집 Vol.2021 No.11

Objective: 본 연구의 목적은 텍스트 마이닝을 통해 스마트폰 카메라로 촬영한 사진에 대한 감성을 평가하는데 사용될 수 있는 대표적인 감성 어휘를 추출하는데 있다. Background: 최근 사용자들이 메타버스와 같이 현실과 가상공간이 융합된 디지털 도시에서 자아를 가꾸고 표현하는 활동이 활발해지고 있다. 이러한 디지털 도시에서의 사용자 감성은 카메라를 통해 구현된 가상의 이미지에 의해 발생하며, 사용자는 이러한 이미지로 자신을 표현하고자 한다. 본 연구에서는 인스타그램과 같은 SNS에서 추구하는 감성이 곧 디지털 세계에서의 감성 중 하나일 것이며, 사용자가 SNS에 업로드하는 이미지, 즉 스마트폰 카메라의 사진을 통해 이러한 감성을 평가하려 한다. 그러나, 스마트폰 카메라와 관련하여 사용자들이 추구하는 촬영 결과물의 감성에 대한 연구는 미흡한 실정이다. 본 연구는 스마트폰 사용자들이 온라인에서 사용자 경험을 공유한다는 점에 착안하여, 스마트폰 카메라의 사진과 관련하여 사용자가 게시한 비정형 텍스트 데이터 (댓글, 포스트 등)에 텍스트마이닝 기법을 적용하여 감성적 측면에서 의미있는 정보를 얻고자 한다. Method: Voice of the Customer(VoC)를 탐색하고자 온라인 공간에 게시된 본문과 댓글 총 7049건을 수집하였다. 해당 데이터를 기반으로 텍스트 마이닝을 수행하여 형용사 및 부사 형태의 감성 어휘를 추출하였다. 이후 연구진이 어휘들의 적합성을 평가하였으며, 유사한 의미를 지닌 어휘들을 그룹핑하여 주요 감성 어휘들을 선별하였다. 요인분석을 통해 대표 감성 어휘들을 최종적으로 추출하였다. Results: 텍스트 마이닝을 통해 형용사 및 부사 형태의 감성 어휘가 321개 추출되었으며, 이는 연구진의 적합성 평가를 통해 14개의 감성 어휘로 축소되었다. 요인분석을 통해 해당 감성 어휘들은 최종적으로 ‘강렬한’, ‘부드러운’, ‘생생한’, ‘세련된’ 4개의 대표감성으로 분류되었다. Conclusion: 텍스트 마이닝 및 요인분석을 통해 스마트폰 카메라 사진을 감상할 때 사용자들이 고려하는 주요 감성들을 파악할 수 있었다. Application: 본 연구를 통해 추출된 감성 어휘는 스마트폰 카메라로 촬영한 사진의 감성을 평가하고 사용자들이 추구하는 사진의 감성을 탐색하는데 유용하게 활용될 것으로 판단된다.

A Study on Sensibility Evaluation for Smartphone Camera Photography Based on Text Mining

Min Chul Cha(차민철),Cherin Lim(임채린),Jae Moon Sim(심재문),Da Yeong Kim(김다영),Yong Gu Ji(지용구) 대한인간공학회 2021 대한인간공학회 학술대회논문집 Vol.2021 No.11

Objective: The purpose of this study is to extract representative emotional vocabulary that can be used to evaluate the sensibility of photographs taken by a smartphone camera through text mining. Background: Recently, users have been actively socializing, cultivating, and expressing themselves in digital cities, such as a metaverse, where the reality is merged with virtual spaces. User sensibility in these digital cities is generated by the virtual image rendered through the user’s smartphone camera, and users intend to express themselves through such an image. The sensibilities pursued by users in social media spaces such as Instagram are assumed to be analogous to those pursued in the digital world. Consequently, this study aims to evaluate the sensibility of images uploaded on SNS platforms, which are in essence, photographs produced by smartphone cameras. However, research regarding the sensibility pursued by users in relation to photographs taken by smartphone cameras is currently insufficient. Based on the fact that smartphone users actively share user experiences online, this study intends to obtain meaningful information in terms of emotion by applying text mining techniques to unstructured text data (comments, posts, etc.) posted by users regarding smartphone camera photography. Method: In order to examine the Voice of the Customer (VoC), a total of 7049 posts and comments uploaded online were collected through web crawling. Text mining was performed on the accumulated data to extract adjectives or adverbs that could be utilized as emotional vocabulary. By evaluating the aptness of each vocabulary, and grouping synonymous vocabulary, the research group selected major emotional words. Through factor analysis, the most representative emotional vocabulary were finally extracted. Results: A total of 321 adjectives and adverbs were extracted through text mining, which was then reduced to 14 words through the evaluation of adequacy proceeded by the researchers. In the final stage, the emotional vocabulary were classified into four representative sensibilities through factor analysis: ‘strong’, ‘soft’, ‘vivid’, and ‘trendy’. Conclusion: By applying text mining techniques and factor analysis, the study derived the main sensibilities that users consider when taking and viewing smartphone camera photographs. Application: The emotional vocabulary extracted from this study is anticipated to be useful in evaluating the sensibility of photographs taken by smartphone cameras, and exploring the sensibility of photographs pursued by users.