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안상근,김성수 한국농업정보과학회 1999 농업정보과학 Vol.1 No.1
The major findings of this study were as follows; 1) The mean score of user's satisfaction was higher than that of the theoretically expected one. 2) The mean score of user's satisfaction in information con-tent was higher than that of preview studies showed. 3) While demographic characteristics such as gender, age, level of education, cognition type and main crop were not significantly related to the degree of user's satisfaction by the factors combined together, each other showed some type of relationship to the dependent variables. Gen-der was significantly related to information relevance and system convenience, and so was the level of education and information efficiency. 4) Situational Variables such as computer ability, support level of information center, attitude, computer education were signiHcantly related to the degree of user's satisfaction. 5) Significant differ-ences were found between the user's satisfaction and performance variables such as time of system usage, fre-quency of system usage. 6) Three determinants such as support level of information center, attitude and main crop explained 42.60% of the total variance of user's satisfaction in utilizing agriculture information system. 7) Support level of information center, attitude and main crop, computer education explained 35.20% of the vari-ance for total degree of user's satisfaction in utilizing agriculture information system.
지하 구조물 동절기 온도조건에서의 방수공법별 습도 변화량 분석
안기원,이연실,이정훈,송제영,오상근 한국구조물진단유지관리공학회 2016 한국구조물진단유지관리공학회 논문집 Vol.20 No.1
현재 대형 빌딩이나 공동주택에 건설되는 지하구조물은 건조수축, 시공이음, 폼타이부 등에서 콘크리트 균열로 인한 누수가 많이 발생되고 있다. 누수가 발생하게 되면 구조물의 지하공간은 결로, 곰팡이 등이 발생되어 지하 환경을 악화시키고 구조물의 콘크리트로 흡수되 면 철근의 부식 등을 유발하여 구조물의 안전을 위협한다. 이는 지하구조물의 사용과정에서 장기적인 쾌적성과 구조물에 안전성이 고려되지 않은 설계와 시공의 결과이며 누수 하자에 대하여 유도배수처리로 대응하기 때문에 근본적인 누수보수가 이루어지지 않아 지하구조물은 항시 누수를 허용하고 있는 실정이다. 따라서 본 연구에서는 지하에 적용되는 방수공법을 내방수와 외방수로 분류하고 이를 바탕으로 지하구조물 과 유사한 간이시험체를 제작하였으며, 결로가 많이 발생되는 동절기의 온도조건을 기준으로 지하환경의 방수공법별 습도변화량을 분석할 것 이다. This paper proposes the appropriate waterproofing methods for underground structures after applying different types of waterproofing materials on the concrete test specimens and selecting the best results out of humidity testing in winter conditions. Results of the testing showed that the underground structures absolutely require relevant waterproofing application based on the environmental conditions; when applied with interior waterproofing, the results showed that the concrete maintained high level of humidity and reinforcing steel within the concrete layer corroded. However, when applied with exterior waterproofing, it was shown that the waterproofing layer prevent direct contact with water and concrete, thereby protecting the concrete structure and improving overall durability. It follows that during underground structure construction, exterior waterproofing methods are have shown by an effective method for improving the durability as well as providing a comfortable interior environment for users.
안상근,서태규,전광길,조중휘,Ahn, Sang-Geun,Seo, Tae-Kyu,Jeon, Gwang-Gil,Cho, Joong-Hwee 대한임베디드공학회 2016 대한임베디드공학회논문지 Vol.11 No.6
In this paper, we propose an improved single view metrology (SVM) algorithm to accurately measure the height of objects. In order to accurately measure the size of objects, vanishing points have to be correctly estimated. There are two methods to estimate vanishing points. First, the user has to choose some horizontal and vertical lines in real world. Then, the user finds the cross points of the lines. Second, the user can obtain the vanishing points by using software algorithm such as [6-9]. In the former method, the user has to choose the lines manually to obtain accurate vanishing points. On the other hand, the latter method uses software algorithm to automatically obtain vanishing points. In this paper, we apply image resizing and edge sharpening as a pre-processing to the algorithm in order to improve performance. The estimated vanishing points algorithm create four vanishing point candidates: two points are horizontal candidates and the other two points are vertical candidates. However, a common image has two horizontal vanishing points and one vertical vanishing point. Thus, we eliminate a vertical vanishing point candidate by analyzing the histogram of angle distribution of vanishing point candidates. Experimental results show that the proposed algorithm outperforms conventional methods, [6] and [7]. In addition, the algorithm obtains similar performance with manual method with less than 5% of the measurement error.