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이동일(Dong Il Lee),백승욱(Seung Wook Baek) 대한기계학회 2014 大韓機械學會論文集B Vol.38 No.1
본 연구는 집광장치와 태양추적장치를 이용함으로서 제한된 면적을 가지는 집광형 태양전지의 발전효율을 증가시키는 연구를 진행하였다. 태양전지에서 발생된 열은 온수나 난방에 사용되도록 흡열기를 이용하여 회수하였다. 이로서 집광형 태양전지를 이용한 시스템은 전기와 열을 동시에 공급할 수 있다. 태양위치에 따른 실시간 추적, 일몰 이후 난방장치의 동쪽방향 원상복귀, 원상복귀후 자동종료는 조도센서와 Simulink 프로그램으로 구현하였다. 흡열기 입구 속도, 핀설치 유무, 입구위치에 따른 흡열기 온도를 해석하였으며 실험결과와 일치하였다. In this study, the generation efficiency of the limited area of a concentrator solar cell was increased by using a solar concentrator and a tracking device. Heat generated by the solar cell was collected using a thermal absorber for supplying hot water or heating. Thus, the concentrator solar cell system provided electricity and heat simultaneously. Tracking of the sun by detecting the sun"s position, repositioning of heating device towards the east after sunset, and shutting down of system after sunset were successfully implemented using an illuminance sensor (CdS) and Simulink, a commercial software package. We performed parametric analysis of the velocity, fin installation, and entrance location with respect to the operating temperature of the concentrator solar cell. A heat transfer simulation model was developed for comparing the actual temperature profiles of the concentrator solar cell and thermal absorber, and good agreement was found between the results of the simulations and the experiments.
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아파트의 층수와 일조량, 소음, 조망, 사생활침해 가능성 간의 관계
이동일(Lee Dong-Il),이경진(Lee Kyoung-Jin),송명규(Song Myung-Gyu) 한국도시행정학회 2010 도시 행정 학보 Vol.23 No.2
The purpose of this paper is to evaluate the relations among the floor(F), the sunlight received (SR), the exposure to noise (EN), the view commanding (VC), and the vulnerability to violation of residents’ privacy (VP) of an apartment. The sample studied is one thousand and two hundred dwellings belonging to six apartment complexes in Seoul. The facts found through correlation analyses, factor analyses, and regressions are summed up as follows; First, it turns out to be very evident multiple correlations among F, SR, EN, VC, and VP. Second, as a whole, the higher the F of a particular apartment is, the more advantageous the apartment is in SR, VC, and VP, but the more disadvantageous in EN. Third, as a result, the apartment groups just under the top floor tend to be the most expensive. Finally, the price gap between the highest and the lowest apartment groups is proved to be eleven to sixteen percent.
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소비자 집단 인터뷰에서 의미 네트워크 응집 구조의 이해
이동일 ( Dong Il Lee ),이혜준 ( Hye Jun Lee ) 한국소비자학회 2012 소비자학연구 Vol.23 No.2
기존의 정성적 연구는 응답자들의 발화 내용 중 특징적 반응들을 취합, 해석하는 방식으로 분석을 진행하여 연구 자의 주관에 의해 해석되는 오류가 발생할 우려가 있다. 이에 대한 대안으로 내용 분석이나 LIWC 를 활용하는 방 법 등이 제안되었으나 이들 분석 방법도 정성적 연구의 한계를 충분히 극복하지 못하고 있다. 본 연구는 기존의 정 성적 연구방법들에 대한 대안으로 의미 네트워크 분석을 제안한다. 의미 네트워크 분석은 인간의 인지구조 내의 개념이 기호화되어 표출되는 단어를 노드로 정의하고 이 단어들간의 관계를 분석함으로써 정성적 데이터에 대한 해석을 시도하는 방법론이다. 한 네트워크는 여러 개의 하위네트워크로 구성되며 이는 인간의 인지구조 내에서 유사한 개념끼리 범주화된 것이 표출되는 것으로 볼 수 있다. 또한 언어는 집단 내 구성원과의 상호작용을 통해 공유 가능한 공통의 의미를 갖게 되므로 집단 내에서 발화되는 언어는 집단 구성원의 의견을 대표할 수 있을 것이다. 따라서 집단 내 발화 내용에 대한 하위네트워크는 하나의 주제와 관련된 발화에서 사용된 단어들의 집합으로 볼 수 있으며 이에 대한 해석을 통해 전체 네트워크, 즉 전체 발화 내용에 대 한 이해를 도모할 수 있을 것이다. 의미 네트워크 분석은 정성적 데이터 내에 의미있는 키워드를 추출하고, 추출된 키워드들이 한 문장 내에서 동시 에 출현한 빈도를 산출하여 이를 통해 네트워크 분석을 실시하는 과정을 거친다. 따라서 의미 네트워크 분석은 정 성적 데이터가 내포하고 있는 여러 주제에 대해 구조적으로 접근할 수 있으며 이 과정에서 연구자의 주관이 개입할 우려가 상대적으로 적다는 장점이 있다. 또한 대규모 정성적 데이터에 대한 분석시에도 유용한 툴이 될 것으로 기 대한다. 본 연구에서는 의미 네트워크 분석의 접근 방법에 대해 이론적으로 검토하고 분석 과정에 대해 구체적으로 소개 하였으며 이에 따른 분석의 적용 사례를 제시하였다 Researchers have performed the qualitative studies utilizing consumer group interviews to reveal consumers`s responses in depth. In general, most of the qualitative studies have analyzed by researchers` examination every aspect of participants` opinions and interpretation of the distinctive responses. There is concern in this approach that the results may have validity issues, because it is difficult for researcher to keep objective viewpoint. Some studies suggest an alternative methodology like content analysis and LIWC, but these approaches still remain unsolved subjectivity issues. First, content analysis has some disadvantages. Coders encode the qualitative data so the researcher could analyze in the further analysis in a rather quantitative ways. But it is possible that the encoded data may contain the coders` subjectivity according to the coders` understanding of coding schemes. And sometimes the coding scheme implies the researcher`s hypothesis implicitly. Second, LIWC is a kind of text analysis software program which is designed to calculate the degree people use different categories of words across a wide array of texts. It categorizes about 3,000 words into 72 categories. LIWC helps researchers understand the qualitative data more objectively in some degree. Nevertheless it has limit to interpret the words beyond the pre-defined ones designated in the categories. This research proposes a semantic network analysis as an alternative method for the existing qualitative methodologies. The purpose of network analysis is to investigate the relation between linked nodes. If it is applied to the relationship between shared meanings in linguistic communications, then it represents semantic network. In this case, a word becomes a node and a cooccurrance of two words in a sentence becomes a link. Linked nodes are the basic element of semantic network. Semantic network analysis uses words which are included in a qualitative data, and does not exclude any of them by the subjective judgement basis. Thus it can overcome validity issues previously associated with content analysis and LIWC. Semantic network analysis is relatively less likely to be reflected the subjective viewpoint of the researcher and gives us a chance to find out inherent contents structure of qualitative data. Semantic network analysis produces several network indexes which reflect the characteristics of network or node of interest such as density and degree centrality. Network density is calculated the number of connected links in a network compared to the number of possible links. High density implies that people are very interested in the topic in the qualitative data, because very dense network is resulted from highly related topics and keywords in the context of the semantic network. Degree centrality is the number of nodes directly connected to an individual node. A word with a high degree centrality is able to activate many other words, thus it functions as a keyword within the semantic cluster. In this study, we try to make the theoretical background of semantic network analysis base on the existing theories of cognitive linguistics, cognitive psychology, and sociolinguistics. A word which conveys a concept in individual cognitive structure is represented as a node in a semantic network analysis, and researchers may interpret the relation between linked words. One semantic network is composed of several subnetworks which imply the cohesive group of similar concepts within cognitive structure. Moreover language has common meaning between individuals who are belonging to the same social groups through interaction of group members. Therefore we can interpret the subnetwork of semantic network in the group interview as the clique of words which are about one topic. As a result, we can understand the entire semantic network contents structure through interpreting subnetworks. Subnetwork also can be represented by the indices such as density and degree centrality. The process of semantic network analysis is as follows. First, meaningful keywords are extracted from an entire qualitative data. Second, cooccurrance frequency of keywords within one sentence is calculated. Finally, the network analysis is performed, then subnetwork and the network indexes of each subnetwork like density and degree centrality are extracted. The exemplary analysis is shown using consumer group interview data regarding the internet shopping values. The managerial implication and the future research directions are discussed.
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이동일(Dong-il Lee),최인혁(In-hyuk Choi),정윤환(Yoon-hwan Jung) 한국조명·전기설비학회 2005 한국조명·전기설비학회 학술대회논문집 Vol.2005 No.5월
This paper gives a basic information of live line maintenance technique of UHV T/L and introduce a technical background and trends of domestic and abroad. The importance of live line maintenance technology getting increased because the change of power system environment and maintenance conditions in korea this paper explain the present state of the development of live line maintenance technique in korea and show a difference with advanced countries.
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