농촌지역 노인들의 우울증상에 관련된 요인들의 특성

송미숙,전기홍,송현종,김정은,박승구,신상건,이동훈,정성현,최연주,최완철,최민규,황재철,홍지만 아주대학교 1997 아주의학 Vol.2 No.2

This study was performed to identify risk factors for depression among the elderly in a rural area. A survey was done for the elderly living in Gosam-myenn, Ansung-kun during the period of July 28, 1997 and July 30, 1997. Demographic and sodoeconornic characteristics, and functional and health Status were assessed using a structured questionnaire, and the level of depression was measured by GDS score. The data obtained were analyzed by frequencies, percentage, t-test, ANOVA, and multiple regression, and the results were as follows: 1. The total sample consisted of 133 elderly. Of them, 47 elderly (35.4%) showed significant depressive Symptoms. 2. The GDS score was the highest for the group over 85 years of age (p < 0.05). Those living alone or widowed showed lower GDS score than those living with someone or married (p < 0.05). 3. The GDS score was the highest in the absolutely dependent group, followed by the partially dependent group, and the independent group (p < 0.01). The elderly who perceived their health Status as excellent showed the lowest GDS score. In contrast, those who had more than five chronic diseases showed the highest GDS score. 4. The elderly receiving financial and emotional support from their family or friends showed lower GDS score compared to those without any support. 5. The economically dependent group showed higher GDS score than that of independent group. 6. The elderly who involved in leisure activities showed lower GDS score than those without any involvement. 7. In terms of risk factors for depression, we found that perceived health Status, subjective economic Status, leisure activities, living arrangement and financial support were inversely associated with GDS score, whereas labor support was positively associated with GDS score. Based upon the above findings, this study suggests that these risk factors for depression in the elderly should be taken into consideration for a comprehensive mental health program for the elderly living in the rural area.

관동맥질환에서 저밀도 지단백 입자 크기의 분포

임효영,김인숙,승기배,강동헌,전두수,장기육,박준철,이수영,홍순조,최규보 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.8

Economic Design of Control Charts with Variable Sample Size Seheme

최기철,박창순 부산 외국어 대학교 1993 外大論叢 Vol.11 No.1

다중퍼셉트론을 이용한 기초자치단체의 군집화

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.

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.

고온·알칼리성 Bacillus sp.의 Catabolite Repression 저항성 변이주로부터 Cellulase 및 Xylanase의 생산

최수철,정영철,강갑석,심기환,성낙계 慶尙大學校 1990 論文集 Vol.29 No.2

고온·알칼리성 cellulase 및 hemicellulase 생성 미생물을 분리할 목적으로 pH 10.3의 PY-CMC배지에서 55℃로 3회 연속 직접배양하여 효소 생성능이 우수한 20여균주를 분리하였고, 그 중에서 2개균주를 최종 선정하여 균학적 성상을 조사한 결과 고온·알칼리성 Bacillus속과 거의 일치하였다. 선정, 동정된 고온·알칼리성 Bacillus sp. F204와 F1020은 α-1, 4-glucose 등에서는 효소 생합성이 왕성하였으나, glucose와 같은 단당류에서는 효소가 전혀 유도되지 않았는데, 이 두 균주는 carbon catabolote repression을 받고 있었다. 2-deoxy glucose는 야생주에서는 강력한 repressor로 작용하였고, 야생주의 catabolite repression을 해제 시키는데 antimetabolite로 작용한다는 것이 밝혀졌다. NTG(500㎍/㎖, 50℃, 20∼60분)와 UV(2분) 처리후 2-DG(20mM)에 직접배양하여 강력한 catabolite repression resistant strain인 M-211과 M-367을 분리하였다. M-211과 M-367은 2-DG를 energy원으로 이용하였으며, glucose에 대하여 CMCase는 1.5%, avicelase 및 xylanase는 약 1.0%까지 저항성을 보였다. 또한 두개의 변이주의 효소 활성은 CMCase 2배, avicelase 1.5배 및 xylanase3배의 증가를 보였으며, 각 효소생합성을 위한 gene expression은 cAMP-independent transcription을 하는 것으로 나타났다. Cellulase and xylanase synthesis of thermophilic alkalophilic Bacillus sp. F204 and F1020 isolated in our lab, were repressed by glucose and induced by compounds structurally related to α-1,4 linkage (avicel cellulose and xylan et. al.). Catabolite repression-resistant mutants were obtained through treatment of NTG(500㎍./㎖), UV(2 min) and enrichment culture in 2-deoxy glucose (20 mM) containing PY-glucose on the wild type strain. T재 catabolite repression resistant mutants were not repressed by glucose and produced cellulase complex and xylansase when in grown in the presence of 1.0% glucose and 30mM 2-DC, which were repressors in wild type. Enzyme production was greater with the mutants (CMCase of 2 times, avicelase of 1.5 times, xylanase of 3 times) than with the wild type strains under various test conditions. T재 mutants M-211 and M-367 were potential catabolite repression resistant mutants and their gene expression was cAMP independent transcription.

층화 이단 표본설계시 표본크기의 결정

최기철 부산 외국어 대학교 2002 外大論叢 Vol.25-2 No.-

층화 이단 표본설계를 한 후에 표본크기를 계산하는 문제는 일반적으로 유도된 공식이 닫힌형(closed form)이 아닐 때는 수치 해석적인 방법이 필요하다. 이 논문에서는 신과 최(2003)가 유도한 표본크기를 구하는 공식을 수치해석적으로 접근해 표본크기를 구하는 문제를 다룬다. 신과 최(2003)는 pps 집락추출과 각 집락에서 같은 크기의 부표본(subsample)을 추출하여 자체 가중이 되도록 표본설계를 하는 경우에 주어진 비용아래서 모총계의 추정량의 분산을 최소로 하는 최적의 표본추출율을 구하였다. We determine the sample size in stratified two-stage sampling under the fixed cost. Especially, we consider the optimum sampling fractions in pps cluster sampling subject to fixed cost. The optimum sample size is presented in the self-weighting form. We calculate the optimum sample size by simulation.

Plasminogen kringle (angiostatin) 분획의 유효부분 분석

최영기,서원덕,이종수,신광순,김철중 충남대학교 수의과대학 동물의과학연구소 1998 動物醫科學硏究誌 Vol.6 No.-

In order to inhibit the growth of the malignant tumor, the development of various drugs against the malignant tumors has been archived. The combination of these drugs made the tumor therapy possible, but in many cases, secondary matastasis of the tumor to the other organs after its removal has been frequently reported. The angiostain, recently purified and cloned, not only promtes the angiogenesis of the tumor itself in the primary tumor but also inhibits the angiogenesis and metastasis of the secondary tumors. In this study, the nucleic acid sequences of the angiostatin was investigated. And the angiostain gene was expressed in a prokayotic expression system(E. coli) and a eukayotic expression system(Pichia pastoris). The angiostain gene was futher subcloned into 6 clones to characterize its biological activity. In the near future the biological activity and the biochemical property of the protein encoded by each clone will be elucidated.

사이버스페이스의 실재적 표현에 관한 연구

최원자,김기철,이영수 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(계획계)

The purpose of this study is to consider how the characteristics of cyberspace is applied to the contemporary architecture. Cyberspace is a parallel World Generated by computer technology and evolves continuously whit its own logic. It shares its philosophical and scientific background with our world since it was created artificially with human knowledged. Expansion of imagination tend to immaterial in Architecture. The expansion of physical environmental make together virtual environment and coexist. Then the physical environment indicates that new experience to man and development possibilities.

새로운 조성을 갖는 고형 탈묵제의 제조

최형철,남기대,정노희 한국공업화학회 2003 공업화학 Vol.14 No.3

펄프섬유로부터 잉크입자를 효율적으로 제거하여 잉크함량이 적고 백색도가 높은 재생펄프용 탈묵제를 제조하였다 본 연구의 또 다른 목적은 고백색도에 필요한 여러 계면활성제의 적정조건을 찾고 재생펄프의 수율을 높이는 것이다. 본 연구에서 우리는 우수한 탈묵효과를 위해 스테아르산과 여러 유형의 계면활성제를 사용하였다. 그리고 탈묵효율에 미치는 여러 가지 고형 탈묵제의 효과를 알기 위하여 부상탈묵실험을 수행하였다. 그 결과 고백색도와 높은 수율을 얻을 수 있는 새로운 고형 탈묵제의 적절한 조합조성은 스테아르산 75%와 폴리옥시알킬렌알킬아릴에테르 6%를 혼합한 것이었다. 또한 탈묵효과를 폭넓게 적용하기 위해 기포력과 피 안정도, 분산능을 테스트하였다. 새로운 타입의 탈묵제는 폐지 탈묵시 우수한 분산능과 적당한 기포력과 안정성을 나타내었다. A new feinting agent for recycling of waste paper was produced. This agent efficiently removed ink particles from the pulp fiber and the resulting recycled pulp had a high brightness and a low content of residual ink. Efforts were made to find an optimum condition of various surfactants used for high brightness and yield of recycled pulp. In this study, stearic acid was used for various types of general surfactants for deinking. Flotation deinking experiments were conducted in order to examine the effect of various solid-type deinking agents. As a restult, an optimum combination of this new solid-type deinking agent, which resulted in high brightness and yield, was 75 wt% stearic acid mixed with 6wt% polyoxyalkylene alkyl aryl ester. This new type deinking agent had good dispersability, suitable foaming power and foam stability in deinking of waste paper.