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최기철 釜山外國語大學校 1997 外大論叢 Vol.17 No.2
Hansen and Hurwitz (1949) determines at the same time the optimum Zi as function of the Mi and the optimum sampling and subsampling fractions. Futhermore, we discussed the approximate sample size required to estimate Y with a bound B on the error of estimation by simulation. The bound B is chosen by the experimenter and represents the maximum error that he or she is willing to tolerate.
최기철 정보과학연구소부산외국어대학교 1999 情報科學論集 Vol.1 No.-
There are 232 basic self-governing communities in KOREA. Each communities can be classified as large city type, medium/small city type, and rural area type based on the location and number of population. These communities may have different characters on the type. In this paper, we have classified the 232 communities into two groups and tried discriminant analysis by using the housing and demographic variables to find whether the groups can be explained by the variables. We have also tried the multilayer perceptron method to find the classification. By comparing the classification results of multilayer perceptron and discriminant analysis, we have tried to understand the system of multilayer perceptron that is a major classification method of neural network.
최기철,김익수,최은희 ( Ki Chul Choi,Ik Soo Kim,Eun Hi Choi ) 한국하천호수학회 1973 생태와 환경 Vol.6 No.3·4
This survey is based on the seven month researches performed respectively from April to October, 1973 at 4 stations along the Namdae river, Gang Neung in Gang Won-do on the fish fauna and the distribution of its body length. They are as follow; Firstly, the authors have collected 22 species of freshwater fish in this river. If 13 species got by previous collection is added to the number of this survey, it becomes 24 species of freshwater fish belonging 22 Genus and 12 Families. Secondary, the dominant species in the studied area were Moroco lagowskii at station 1∼3, Misgurnus anguillicaudatus at Station 4. Thirdly, the authors studied the body length distribution of M. lagowskii, Cobitis taenia, Barbatula toni, Pungitius pungitius sinnensis, Plecoglossus altivelis and Chaenogobius annularis urotaenia. Fourthly, 2 species, Lampetra reissneri and Pungitius pungitius sinnensis reported that it habitated only in northern part of Won san at east coast, were collected the Namdae river, Gang Neung in this survey. The authors consider that Lampetra reissneri, Pungitius pungitius sinnensis and Oncorhynchus macrostomus in this river were distributed the farthest southern part of east coastin Korea.
바륨관장법(Barium Enema)에 의한 장중적증의 진단 및 치료에 대한 방사선학적 고찰
최기철 전북대학교 의과학연구소 1978 全北醫大論文集 Vol.2 No.-
During the period between 1975 and 1977, barium enema was employed in 22 cases of acute intussusception in Jeonbug National University Hospital. Author studied and analyzed the relationships of reducibility of intussuaception by barium enema to various symptom period, location of intussusceptum, mechanical obstruction on plain film and leukocytosis. The results obtained were summerized as follow; 1. The ratio of male and female was 4.5:1. 2. The 50% of the patients observed were below one year, and the 63.6% were below 2 years of age. 3. The patients treated with barium enema were 68.2%. 4. The recurrence of intussusception after reduction was absent. 5. The symptom period was shorter, the reducibility of intussusception by barium enema was higher. 6. The hydrostatic pressure with barium enema was an effective method of reduction of uncomplicated intussusception. 7. Fever and leukocytosis were initially absent but may be increased secondary by inflammation and intestinal obstruction. 8. The ileocecal type was 77.3%.
층화 이-단 표본추출에서 표본 추출율과 부차표본 추출율
최기철 釜山 外國語 大學校 1998 外大論叢 Vol.18 No.2
We determine the optimum sampling and subsampling fractions in stratified two-stage sampling. The problem is to choose over-all sampling fraction subject to fixed average cost. Primary units are selected with probabilities proportional to size with replacement. The analysis is presented for estimator of the population total in the self-weighting form. We compared the separate ratio estimator and the combined ratio estimator for the population total. The combined ratio estimator is more effcient than the separate ratio estimator.
최기철 부산 외국어 대학교 2003 外大論叢 Vol.27 No.-
표본조사를 하는 경우에 사전에 전체 표본의 크기를 정하여 놓고, 표본설계를 하는 경우가 많다. 이 때에는 주어진 전체표본 크기로 각 층별로 표본을 할당하여 분산을 최소로 하는 문제가 된다. 이 논문에서는 pps 집락추출과 각 집락에서 같은 크기의 부표본(subsample)을 추출하여 자체 가중이 되도록 표본설계를 하는 경우에 최정의 부표본 크기 m_(opt)값을 구한다. We determine the optimum sampling fractions in pps cluster sampling given the total sample size. We study for optimum allocation. The optimum sample size is presented in the self-weighting form.