http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Context를 고려한 Digital 곡선의 특징점 검출
최형길(Choi H. G.),김경아(Kim K. A.),김문현(Kim M. H.) 한국정보과학회 1991 한국정보과학회 학술발표논문집 Vol.18 No.2
Digital 폐곡선의 형상의 특징을 표현하기 위하여, 곡선의 국부적인 성질만을 고려한 연구가 주로 되어왔다. 본 논문에서는 한 점이 포함된 context, 즉 전체영상의 구조적인 특징 및 주위 영역의 특징을 반영한, 국부적인 곡률의 최대치를 찾는 새로운 algorithm을 제안한다. 제안된 algorithm은 digital 곡선의 k-곡률 산출 방식에서 문제가 되는 k 값을 입력 변수로 요구하지 않고 각 점에서 주위환경에 따라 자동적으로 산출한다. 제안된 algorithm을 이차원 영상의 경계선에 적응시켜 보였으며, 효율성을 기존의 context를 고려한 algorithm과 비교하여 보였다.
대도시와 농어촌에서 치과의료기관 의료수익 분포의 지역 간 차이
최형길(Hyungkil Choi) 대한치과의사협회 2016 대한치과의사협회지 Vol.54 No.12
The increase rate of dentists’ competition is very fast at metropolitan areas in South Korea. We compare metropolitan and rural parameters to investigate the relation between competition and revenue variation. The competition and revenue variables of 73 metropolitan and 75 rural areas were calculated from 2010 Census of Service Industry microdata which include non-insurance revenues of dental clinics. Independent sample t-test results showed that the level of competition among dental clinics in metropolitan areas is higher. The lowest and the low ranked revenues are higher in rural areas. The highest and the average revenues are higher in metropolitan areas. But, 25 percentile and median revenues has no significant difference between two areas. Simple log linear regression results showed that the number of clinics could explain the distribution of revenues in both areas better than the density of active dentists and Herfindahl-Hirschman index. In the areas with many clinics have high maximum and average revenues and low minimum revenues. The increasing rate of maximum revenues is higher in metropolitan areas though the decreasing rate of minimum revenues is higher in rural areas. Metropolitan areas have higher Gini coefficients than rural areas, but the increasing rate of Gini coefficients is lower than rural areas. Findings from this study are useful reference when the dentists select the opening areas. One is that the median revenues between metropolitan and rural areas have no significant difference. The other is that the rural areas ensure the more stable and uniform revenues. The results would help to relieve the consumptive competition among dentists and to achieve the distributional efficiency of dental human resources.
콘크리트 초기 수축균열특성 평가를 위한 판상-링형 구속시험방법의 성능평가에 관한 연구
최형길 ( Choi Hyeong-gil ),라훌 ( Rahul Didolkar ),이의배 ( Lee Eui-bae ),남정수 ( Nam Jeong-soo ),김규용 ( Kim Gyu-yong ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.1
In Concrete shrinkages occur like plastic shrinkage and drying shrinkage in the early age of the concrete by evaporation and transfer of moisture. Within the country, the crack test standardized by KS is used to test the drying shrinkage of the concrete by using the restricted drying shrinkage of Dumbbell type mold, but this test is for the cracking-point and the restricted shrinkage stress. Thus it is difficult to valuate the crack quantitative test. In this study, it is intended to develop the Flat-ring type restrained test method. And the shrinkage transformation conduct of the concrete, to provide the basic data for the valuating method of national concrete shrinkage cracking feature, and to verify the pertinence of the Flat-ring type restrained test method by comparing and valuating in accordance with the other concrete shrinkage cracking valuation method internally and externally.