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석탄가스화 용융슬래그를 혼합잔골재로 사용한 콘크리트의 기초적 특성 및 내구성 분석
최일경 ( Choi Il-kyung ),한민철 ( Han Min-cheol ) 한국건축시공학회 2020 한국건축시공학회지 Vol.20 No.4
The aim of the research is to evaluate the possibility of using coal gasification slag (CGS) as a combined aggregate for concrete mixture. To achieve this goal, the fundamental properties and the durability of concrete were analyzed depending on various combining ratio of CGS into both fine aggregate with favorable gradation and relatively coarse particles. According to the results of the experiment, slump and slump flow were increased with content of CGS regardless of crushed fine aggregate with good and poor gradations while the air content was decreased. For the compressive strength of the concrete, in the case of using the crushed aggregate with good gradation, increasing CGS content decreased compressive strength of the concrete, while when the concrete used crushed aggregate with poor gradation, the compressive strength was the maximum at 50% of CGS content. As a durability assessment, drying shrinkage was decreased and carbonation resistance was improved by increasing CGS content. On the other hand, for freeze-thawing resistance, CGS influenced adverse effect on freeze-thawing resistance. Therefore, it is known that an additional air entrainer is needed to increase the freeze-thawing resistance when CGS was used as a combined aggregate for concrete.
송종법(Jong-Beop Song),최일경(Il-kyung Choi),정효경(Hyo-kyung Jung),권순홍(Soon-Hong Kwon),권순구(Soon-Gu Kwon),박종민(Jong-Min Park),김종순(Jong-Soon Kim),정성원(Sung-Won Jung),최원식(Won-Sik Choi) 한국산업융합학회 2017 한국산업융합학회 논문집 Vol.20 No.2
Dental implants are required to have biomechanical functions and biostability in order to perform authoring, pronunciation, and aesthetic functions in the oral cavity. In terms of biostability, pure titanium for medical have good biostability and no rejection in the alveolar bone. with appropriate strength in terms of strength as well as biocompatibility. In recent years, various surgical methods and devices have been developed to improve the convenience and safety of the procedure. However, as the number of procedures increases, the screw loosening of the abutment screw connecting the artificial root and the abutment There are many reports of artificial root and abutment fracture. Fig. 1 is an example of a case where the upper part of the abutment screw is arbitrarily modified to remove the abutment by the abutment fracture due to the loosening of the abutment screw. The fundamental cause of abduction of the abutment screw is caused by the slight movement due to the lowering of the retention force of the abutment screw. It is necessary to minimize loosening of the abutment screw to avoid problems such as fracture during the period of using the implant. The purpose of this study is to investigate the structure of the abutment screw to prevent the loosening of the abutment screw by forming 0.5mm slot
한준희 ( Han Jun-hui ),신세준 ( Sin Se-jun ),최일경 ( Choi Il-kyung ),김종 ( Kim Jung ),한민철 ( Han Min-cheol ),한천구 ( Han Cheon-goo ) 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.23 No.2
본 논문에서는 혼합골재 종류 변화 및 CGS 치환율에 따른 콘크리트의 내구성 특성을 분석하였다. 실험결과 CGS 치환율이 증가할수록 AE공기량의 영향으로 내동해성은 저하, 조직치밀화의 영향으로 탄산화는 지연되는 것으로 나타났다.
석탄 가스화 용융 슬래그를 혼합 잔골재로 사용한 FA 치환 콘크리트의 수화열 저감
한준희 ( Han Jun-hui ),이영준 ( Lee Young-jun ),최일경 ( Choi Il-kyung ),김종 ( Kim Jung ),한민철 ( Han Min-cheol ),한천구 ( Han Cheon-goo ) 한국건축시공학회 2019 한국건축시공학회 학술발표대회 논문집 Vol.19 No.2
This study was intended to examine the possibility of reducing hydration heat by FA substitution and combination of slag (CGS) from coal gasification power generation (IGCC) with mixed aggregate for concrete. The analysis results showed good results if liquidity increases as the ratio of CGS increases, air volume decreases, and compressive strength is mixed up to 25% in the residual aggregate. The results showed that the heat of hydration was reduced compared to plain due to the boron content of CGS as the CGS substitution rate increased, but it was larger due to the combination with FA substitution. It was found that the heat of hydration was reduced.
최일경,고애란 한국의류학회 1995 한국의류학회지 Vol.19 No.5
The purpose of this study was 1) to identify the constructing factors of jeans brand image 2) to analyze the domestic jeans market using perceptual maps of three benefit segments based on stdy(I). The questionnaire consisted of brand preference, attribute of brand image and wearer image was selected from the previous studies or developed for this study. The subjects were 350 male and female university students who have purchased at least one of the nine jeans wear brand selected for the study. For statistical analysis, reliability test, factor analysis, MANOVA, and multiple regression were used. The results of this study were as follows: 1. Symbolism, quality, and economy were found out as constructing factors of brand image in the attribute dimensions, while innovative and active image were found out in the wearer image dimensions. 2. 9 perceptual maps of attribute dimensions and 3 perceptual maps of wearer image dimensions were constructed and each ideal vector was drawn.
혜택세분화와 인식도에 의한 진의류 브랜드 이미지 연구(Ⅰ) : 진의류에 대한 추구혜택을 기준으로한 소비자 세분화
최일경,고애란 한국의류학회 1995 한국의류학회지 Vol.19 No.4
The purpose of this study was 1) to find out the benefits sought factors of jeans and to segment the consumer market 2) to analyze purchase behavior, brand loyalty, and demographic characteristics of benefit segments. The subjects were 350 male and female university students who have purchased at least one of the nine jeans brands selected for this study. For statistical analysis, reliability test, percentage, factor analysis, cluster analysis, x^2-test, and analysis of variance were used. The results of this study were as follows; 1. Benefits sought by consumer were found to include four different factors-brand value, individuality, fashionability, and practicality. 2. As a result of subdividing the consumers, three distinctive groups were formed on the basis of benefit factors-individuality·fashion oriented group, brand value oriented group, and practicality oriented group. 3. Brand value oriented group rated the highest in all of following variables number of jeans possessed and purchased annually, brand loyalty, average household income, average monthly allowences, and amount of money spent in purchasing clothes in each season. Individuality fashion oriented group rated the second.