「 명예 」 가 외로운 풍토

조홍규 대한지방행정공제회 1969 도시문제 Vol.4 No.9

A Comparison of Construction Cost Estimation Using Multiple Regression Analysis and Neural Network in Elementary School Project

조홍규,김경곤,김장영,김광희 한국건축시공학회 2013 한국건축시공학회지 Vol.13 No.1

In the early stages of a construction project, the most important thing is to predict construction costs in a rational way. For this reason, many studies have been performed on the estimation of construction costs for apartment housing and office buildings at early stage using artificial intelligence, statistics, and the like. In this study, cost data held by a provincial Office of Education on elementary schools constructed from 2004 to 2007 were used to compare the multiple regression model with an artificial neural network model. A total of 96 historical data were classified into 76historical data for constructing models and 20 historical data for comparing the constructed regression model with the artificial neural network model. The results of an analysis of predicted construction costs were that the error rate of the artificial neural network model is lower than that of the multiple regression model.

Ⅰ급 부정교합자에서 발치와 비발치를 통한 교정치료 전후의 치아와 안모의 변화

조홍규,김종철 전남대학교 치과대학 1995 전남치대논문집 Vol.7 No.1

In order to compare the changes of dentofacial skeleton, teeth and soft tissue profile in Class 1 malocclusion patients treated with and without extraction, cephalometric radiographs were taken in 22 female patients as extraction group and 23 female as nonextraction group who were treated in the Department of Orthodontics in Chonnam National University Hospital. The results were as follows : 1. At the beginning of treatment, average age was 19.0 years in extraction group and 15.9 years in nonextraction group. Duration of treatment was 2.8 years in extraction group and 1.7 years in nonextraction group. 2. Before treatment, there were significant difference between 2 groups in the amount of protrusionn and proclination in upper and loweer central incisor and lower lip protrusion. After treatment, these differences were decreased. 3. In comparison before and after treatment in extraction group, upper and lower central incisor protrusion and lower lip protrusion were significantly improved. In nonextraction group, retrusion and improvement of inclination of upper and lower central incisor were not found.

Ti-10Ta-10Nb합금의 산화거동 및 세포독성에 관한 연구

조홍규 광주보건대학 2004 論文集 Vol.29 No.-

A new Ti- 10Ta-10Nb alloy has designed and examined some possibility of forming more passive oxide film by oxidation treatment which is closely related to corrosion resistance and biocompatibility. Ti-6Al-4V and Ti-10Ta-10Nb alloys were prepared by consumable vacuum arc melting and homogenized at 1050℃ for 24hours. Alloy specimens were oxidized at the temperature range of 400 to 750℃ for 30minutes, and the oxide films on Ti alloys were analysed by optical microscope, SEM, XPS and TGA. Cytotoxicity test was performed in MTT assay treated L929 fibroblast cell culture by indirect method. It is found out that the oxide film on Ti-10Ta-10Nb alloy is denser and thinner compared to Ti-6Al-4V alloy. The weight gain during the oxidation was increased rapidly at the temperature above 650℃ for Ti-6Al-4V alloy and above 700℃ for Ti-10Ta-10Nb alloy respectively. It was analysed that the passive film of the Ti alloys consisted of TiO_(2) through X-ray photoelectron spectroscopy (XPS) analysis. It is found out by cytotoxicity test that moderate oxidation treatment lowers cell toxicity, and Ti-10Ta-10Nb alloy showed better result compared to Ti-6Al-4V alloy.

해외와 국내의 치과기공 교육과정 비교분석

조홍규,Cho, Hong-Kyu 대한치과기공학회 2009 대한치과기공학회지 Vol.31 No.4

The purpose of this study was to furnish data for a new curriculum of the "Bachelor's Degree Course at Junior College" in Korea. Domestic three colleges and one university were selected for comparative analysis about curriculum of the dental laboratory technology. Moreover, three colleges and three universities were selected in Australia, Canada, and USA which are preferred highly on overseas employment by the korea students of dental laboratory technology. From the six colleges and four universities, number of subjects and credit hours on special study were acquired and compared. Between domestics, an agreement on special study were compared. Transferable subjects from korea to foreign were acquired. From the number of subjects and credit hours on special study comparing, following results were obtained. The results were as follows; 1. The ratio of the number of subjects and credit hours on special study were averagely 78.2% and 83.7% in domestic college, 70.8% and 69.7% in domestic university. 2. The ratio of the number of subjects and credit hours on special study in Canada was similar to domestic but those in Australia and USA were less than domestic. 3. Between domestics, an agreement of subjects and credit hours on special study were 81.2% and 84.2% in Catholic University of Busan, 72.2% and 76.4% in Daejeon Health Science College, 71.2% and 72.8% in Gwangju Health College University, 65.1% and 65.9% in Shin Heung College University respectively. 4. Transferable subjects from Korea to Australia or Canada was more than USA. Those to Australia was similar to Canada. These results suggest that the degree of special study in domestic is more than foreign, transferable subjects from Korea to Canada should be profitable and those data is furnish for a new curriculum of the "Bachelor's Degree Course at Junior College" in Korea.

Aggregating Prediction Outputs of Multiple Classification Techniques Using Mixed Integer Programming

조홍규,한인구 한국지능정보시스템학회 2003 지능정보연구 Vol.9 No.1

기타 : 현대판 남명사상

조홍규 남명학연구원 2015 선비문화 Vol.27 No.-

자연치와 도재관에 대한 색조선택의 동일성

조홍규 대한치과기공학회 2007 대한치과기공학회지 Vol.29 No.1

3차원 영상에 의한 안면 비대칭의 분석

조홍규,Cho, Hong-Kyu 대한치과기공학회 2005 대한치과기공학회지 Vol.27 No.1

This study is to show the qualitative analytic methods of facial asymmetry with three-dimensional morphometry and find out asymmetry change resulted from enlarging three local regions. Steel balls (1.2mm in diameter) were attached in twenty seven landmarks of a symmetrical artificial human skull. This artificial human skull was used as experimental materials. Twelve different asymmetrical artificial human skulls were formed by gradually enlarging the mandibular body length, gonial angle, and ramus height of the left hemiface. From the three-dimensional morphometry of each skull type, nine local area measurements and three total sum area measurements(representing the mandibular area, maxillary area, and lower facial area) were acquired and made into the surface area asymmetry degree. Menton deviation itself was used as the surface area asymmetry degree while right-left percentages were used in the other measurements. These surface area asymmetry degrees were compared with each other to find out asymmetry change according to the degree of actual facial asymmetry. Through the statistical analysis, following results were obtained. The results were as follows: 1. Left maxillary area of artificial human skull was 7.13$\pm$0.26% larger while mandibular area was 4.14$\pm$0.12% smaller than each those of right hemiface. After all, left lower facial area was 1.44$\pm$0.07% larger than those of right hemiface.(n=7). 2. Among the reduce rates of surface area asymmetry degree resulted from enlarging three local regions, ramus height was similar to mandibular body length while it was bigger than those of gonial angle. 3. Among the increase rates of menton deviation resulted from enlarging the local regions, ramus height was the biggest, mandibular body length was the second and gonial angle was the smallest. These results suggest that three-dimensional morphometry can be used to qualitatively analyse facial asymmetry and the asymmetry degree is more influenced by enlarging the ramus height, mandibular body length than those of gonial angle.

통일포럼 : 정보화시대와 통일시대

조홍규 평화문제연구소 1998 통일한국 Vol.174 No.-