• 품질경영학회지
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• 제26권4호
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• pp.101-110
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• 1998

The mean residual life function is the expected remaining life of an item at age $\chi$. The problem of trend change in the mean residual life is great interest in the reliability and survival analysis. In this paper we develop a new test statistic for testing whether or not the mean residual life changes its trend based on a complete sample. Monte Carlo simulations are conducted to compare the perfor mance of our test statistic with that of previously known tests.

• 문화기술의 융합
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• 제8권5호
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• pp.17-27
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• 2022

본 연구는 코로나19로 인한 사회관계의 변화가 노인의 삶의 만족도에 미치는 영향을 확인하고 사회관계 변화와 삶의 만족도의 관계에서 여가만족도가 매개효과를 가지는지 검증하고자 하였다. 본 연구에서는 2021년 사회조사자료를 활용하였으며, 65세 이상 노인 7,203명을 분석대상으로 하였다. 분석을 위해 다중회귀분석을 실시하였으며, 매개효과의 유의미성은 부트스트래핑(bootstrapping) 방법을 사용하여 검증하였다. 연구결과 코로나19로 인한 사회관계변화는 노인의 삶의 만족도에 유의미하게 영향을 미치는 것으로 나타났다. 즉 코로나19로 인해 이웃과의 관계 및 친구와의 관계가 멀어진 경우 노인의 삶의 만족도가 낮아지는 것으로 나타났다. 또한 여가만족도는 코로나19로 인한 사회관계 변화가 삶의 만족도에 미치는 영향을 부분 매개하는 것으로 나타났다. 본 연구의 결과는 코로나19와 같이 사회적 거리두기가 필요할 수 있는 상황에서 노인의 삶의 질 저하를 방지하기 위한 다양한 개입이 필요함을 제시한다.

• 한국콘텐츠학회논문지
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• 제15권3호
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• pp.123-132
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• 2015

본 연구의 목적은 노인일자리사업 참여자의 일자리사업 참여만족, 경제상태만족 및 자기가치감 변화와 삶의 질의 구조적 관계를 실증적으로 분석하는 것이다. 본 연구에는 노인일자리사업 참여노인 실태조사(2012)의 데이터가 분석에 사용되었다. 분석 결과, 일자리사업 참여만족, 경제상태만족 및 자기가치감은 삶의 질에 직접적으로 영향을 미칠 뿐 아니라, 일자리사업 참여만족은 경제상태만족과 자기가치감을 통하여 삶의 질에 유의미하게 영향을 미쳤다. 또한 경제상태만족과 삶의 질의 관계에서 자기가치감이 간접효과를 지니는 것으로 나타났다. 이를 통하여 본 연구는 향후 노인일자리사업 수행에 있어 정책적 실천적 함의를 제시하였다.

• 한국주거학회논문집
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• 제12권4호
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• pp.43-52
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• 2001

The purpose of this study is to fined out the characteristics of using & change of the residential space according to the children age and family life cycle. The results of this study are as follows: The first, as children grow up, children's activity space changed from living room to the private room, and housing condition was related to the frequency of each activity. The second, as children grow up, family's sleeping pattern changed, and this change effected the number of private rooms for sleeping and the use of the extra room. The third, changes of the using of dwelling space come out several pattern, increasing bedroom number through reconstruction, exchange of An-band and children room, parents' sleeping space move to living room, and change the function of rooms. The change pattern of the correspondence to the housing needs differed from each family life cycle stage.

• 재무관리연구
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• 제20권2호
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• pp.263-291
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• 2003

이 연구는 Generalized Malmquist 지수를 이용하여 1997년 외환위기 때부터 2001년까지 국내 생명보험산업의 생산성변화를 기술효율성, 규모효율성 및 기술진보의 변화로 구분하여 측정하였다. 생명보험 산업의 생산성은 외환위기에도 불구하고 매년 증가하였음을 확인하였으며, 기술진보와 규모효율성의 변화는 순수기술효율성의 하락을 상쇄하고 생산성향상에 기여하였으며, 특히 기술변화가 더 크게 생산성향상에 공헌하였음을 확인하였다. 이러한 생산성의 증가는 구조조정으로 기인한 것으로 보인다. 외환위기 이후에 효율성은 계속하여 하락하였으며, 이것은 선도 생명보험회사의 효율적 프론티어가 일반 생명보험화사의 생산성보다 더 크게 증가하였기 때문에 발생한 것으로 확인되었다. 낮은 효율성은 생산성의 증가에도 불구하고 경영개선에 의하여 생산성을 크게 증가시킬 수 있다는 것을 말해주고 있다.

• 품질경영학회지
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• 제30권3호
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• pp.195-202
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• 2002

The problem of trend change in the mean residual life is great Interest in the reliability and survival analysis. In this paper, a new test statistic for testing whether or not the mean residual life changes its trend Is developed. It is assumed that neither the change point nor the proportion at which the trend change occurs is known. The asymptotic null distribution of test statistic is established and asymptotic critical values of the asymptotic null distribution is obtained. Monte Carlo simulation is used to compare the proposed test with previously known tests.

• 품질경영학회지
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• 제30권4호
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• pp.78-85
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• 2002

The problem of trend change in the mean residual life is great interest in the reliability and survival analysis. In this paper, a new test statistic for testing whether or not the mean residual life changes its trend is developed. It is assumed that neither the change point nor the proportion at which the trend change occurs is known. The asymptotic null distribution of test statistic is established and asymptotic critical values of the asymptotic null distribution is obtained. Monte Carlo simulation is used to compare the proposed test with previously known tests.

• Journal of Life Science
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• 제10권2호
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• pp.9-11
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• 2000

Lipopolysaccharide (LPS) and cell wall protein-A (CWP-A) were extracted from the cell wall of Vibrio vulnificus, Escherichia coli and Salmonella typhimurium. LPSs and CWP-As were injected into rat and the changes of the following blood components were examined. The change of the number of white blood cell (WBC), red blood cell (RCB), platelet (PLT), blood urea nitrogen (BUN) and blood glucose in rat blood and interferon (IFN) activity change by LPS and CWP-A were measured. WBC, RETI, PTT, and BUN were increased and RBC and blood glucose were increased slightly, but PLT was decreased.

• 한국환경복원기술학회지
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• 제27권2호
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• pp.43-53
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• 2024

This study attempted to elucidate the ecological niches and influencing environmental factors of Quercus variabilis and Quercus acutissima, which are representative deciduous broad-leaved trees in Korean forests, taxonomically close and genetically similar, under climate change conditions. Under climate change conditions induced by increased CO₂ and temperature, soil moisture and nutrient environments were manipulated in four gradients. At the end of the growing, plants were harvested to measure growth responses, calculate ecological niches, and compare them with those of the control. Eperimental plants were grown for 180 days in a glass greenhouse designed with four gradients each for soil moisture and nutrient environments under climate change conditions induced by increased CO₂ and temperature. After harvesting, growth responses of leaf traits were measured, ecological niches were calculated, and these were compared with those of the control groups. Furthermore, the responses of the two species' populations were interpreted using principal component analysis(PCA) based on leaf trait measurements. As a result, under climate change conditions, the ecological niche breadth for moisture environment was broader for Quercus variabilis than Quercus acutissima, whereas for the nutrient environment, Quercus acutissima exhibited a broader niche breadth than Quercus variabilis. And the rate of change in ecological niche breadth due to climate change decreased for Quercus variabilis in both moisture and nutrient environments, while for Quercus acutissima, it increased in the moisture environment but decreased in the nutrient environment. Additionally, in terms of group responses, both Quercus variabilis and Quercus acutissima expanded their ecological niches under climate change conditions in both soil moisture and nutrient conditions, with Quercus acutissima exhibiting a broader niche than Quercus variabilis under nutrient conditions. These results indicate that the changes in leaf morphological characteristics and the responses of individuals reflecting them vary not only under climate change conditions but also depending on environmental factors.

• 한국식품조리과학회지
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• 제21권6호통권90호
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• pp.867-876
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• 2005

The purposes of this study were, 1) to investigate the causal relationship between customer's life-style and motivation of eating-out, and 2) to research the causal nexus between motivation of eating-out and satisfaction of attributes to choose the restaurant. Reliability analysis, factor analysis, and Structure Equation Model(SEM) were adapted by Windows SPSS 10.0 and Amos 4.0. Life-style was divided into 7 factors and eating-out motivation into 5. Life-style influenced significantly each motivation of eating-out. It had positive influence on 'Reception and congratulation', 'Change of dietary life', 'Economic saving', "'Preference motivation', and 'Advertisement and companion's need', but negative influence on 'Reception and congratulation', 'Change of dietary life', and 'Preference motivation'. Customer's motivation of eating-out also influenced significantly the attributes. Factorl 'Reception and congratulation' had positive influence on all attributes except for 'Transportation convenience and distance to the shop'. Factor 2 'Change of dietary life' had negative influence on 'Food's taste, quantity, price', 'Sanitation and cleanness', and 'Staff's service quality' Factor 3 "Economic saving' had positive influence on 'Food's taste, quantity, price' and 'Transportation convenience and distance to the shop'. factors 'Advertisement and companion's need' had positive influence on 'Atmosphere of restaurant' and negative influence on 'Food's taste, quantity, price'.