• 응용통계연구
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• 제24권4호
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• pp.597-607
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• 2011

금융자산에의 투자에서 리스크 관리의 중요성이 부각되면서 리스크를 측정할 수 있는 도구로서 Value at Risk (VaR)가 널리 각광을 받고 있다. Value at Risk는 주어진 신뢰수준에서 목표기간 동안 발생 가능한 최대손실로 정의되는데 몇 가지 한계점이 있지만 비교적 간단하게 계산되고 이해될 수 있다는 장점이 있어 리스크 측정 및 관리의 기본적인 측도로 이용되고 있다. 그러나 포트폴리오에 포함되는 자산의 숫자가 많아지는 경우 VaR을 계산하는 데에 필수적인 변동성 추정이 매우 어려워지게 된다. 이때 차원축소의 방법을 생각할 수 있는데, 전통적인 인자분석은 시계열자료에 적합한 방법이 아니기 때문에 직접 적용할 수 없고 자료의 자기상관성을 제거하는 방법이 선행되어야 한다. 본 논문에서는 인자분석의 확장 형태인 시계열인자분석을 활용하여 시계열자료의 차원축소과정을 간결하게 하는 방법을 제시하고, 시계열인자분석으로 차원을 축소할 때 기존의 방법을 사용하는 것과 어떠한 차이가 있는지를 실제 금융자료를 이용한 VaR의 사후검증을 통해 분석하였다.

• 대한가정학회지
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• 제38권10호
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• pp.45-51
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• 2000

This study illucidated the importance of drop Value in the resets of surveying the current values of sizing and grading. Therefore, it is meaningful to get the classification of body form with the appropriate distribution of drop values of the body. The distribution of drop value and the frequency of each form is very helpful to name the combined sizing or coverage of ready-made clothes. This study aimed at classifying body forms with various drop values using multivariate analysis for sizing and grading. Factor analysis and cluster analysis were done using measured values from unmarried women. The resets are as follows; The factor which explains body forms was obtained by factor analysis, and the representative major 18 items which have important roles in classifying body forms were selected among the measured values with high factor loading and communality. 1) The body forms were classified into 3 groups based on the characteristics, frequencies and distributions of them obtained from cluster analysis. 2) Each classified body form showed conspicuous difference in drop value and the difference of body form mainly resulted from the difference between bust and hip(drop value) in Korean unmarried women. 3) Discriminant analysis showed that the most significant discriminant factor of the trunk classification were bust circumference, upper bust circumference, hip circumference and stature. 4) The cover ratio of size studied in this study for the Korean Sizing system for women's garment were founded high.

• 조명전기설비학회논문지
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• 제22권12호
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• pp.101-109
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• 2008

유도전동기는 회전에 필요한 자계를 유지하기 위해 무효전력을 필요로 한다. 만일 전원측을 대신하여 부하측에서 무효전력이 제공될 경우 역률은 향상될 것이다. 유도전동기의 역률은 대개 낮으므로 커패시터로 보상이 필요하다. 내선규정에서 유도전동기의 역률 보상 커패시터의 용량은 출력에 따라 추천된 값의 설치를 권고하고 있다. 그러나 유도전동기는 같은 출력에서도 회전수에 따라 특성이 달라지므로 역률이 일정하지 않아 용량에 따라 일정한 커패시터의 적용은 부적합하다. 그래서 본 논문에서는 같은 출력조건에서 속도에 따라 기존에 제시된 값과 비교한 결과 역률 보상 커패시터의 용량이 약간 높게 설정되어야 함을 확인하였다.

• 한국환경과학회지
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• 제4권5호
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• pp.469-479
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• 1995

The increase of population and industrial activities had brought into eutrophication in the Nakdong river. A remarkable acceleration of eutrophication brought about serious problems for water supply. Therefore, for the purpose of conservation of water quality in the Nakdong river it is necessary to control nutrients. MBOD method was use to evaluate algal growth limiting factor and algal growth potential in the Nakdong river from June to August 1994. The modified biochemical oxygen demand(MBOD) depends on the amount of available inorganic nutrient and organic substrate during 5 day incubation in the dark at 2$0^{\circ}C$. The MBOD assay depends on inorganic nutrients such as P and N as well as reduced carbon and called the MBOD, the MBOD-P, and the MBOD-N, respectively. The results of bioassay by MBOD(Modified BOD) method showed that the MBOD, MBOD-P and MBOD-N value were found to be in the ranges of 3.8~96.0 mg$O_2$/l, 5.6~94.0 mg$O_2$/l and 42.0~220 mg$O_2$/l, respectively. And the the bioassay value was found to be the highest in Koryong area and the lowest in Waekwan area throughout the Nakdong river. The variations of MBOD-P and MBOD-N value showed similar tendencies to the variations of phosphorus and nitrogen value, respectively. By MBOD method, the relationships of MBOD, MBOD-P and MBOD-N value were MBOD ≒ MBOD-P 《 MBOD-N. The MBOD value was nearly equal to the MBOD-P value, and the MBOD-N value was 3 to 20 times more than the MBOD-P value, approximately. Therefore, in the Nakdong river, phosphorus was the limiting factor for algal growth during summer season. The algal growth potential as the concentration of chlorophyll-a in the summer was maximum 5 times more than standing crop as it.

• 벤처창업연구
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• 제10권6호
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• pp.143-153
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• 2015

최근 주택 시장에서 소비자의 투자가치가 미치는 영향력이 증가하고 있으나 투자가치와 구매 의사결정에 사이의 관련성을 규명한 연구는 제한적이다. 본 연구의 목적은 주거가치, 주거만족도, 투자가치, 그리고 매입의도에 미치는 영향력을 분석하는 것이다. 본 연구를 통해, 주거가치의 요인이 주거 만족도와 투자가치에 어떻게 영향을 미치는지를 파악한다. 마지막으로, 매입의도의 영향 관계를 분석하기 위해 585명 거주민을 대상으로 설문조사를 실시하였다. 분석방법은 SPSS 21.0, AMOS 18.0을 사용하여 기초통계, 신뢰도, 구조 방정식을 수행하였다. 연구결과는 다음과 같다. 첫째, 주거가치의 요인분석 결과 주거품질, 경제성, 브랜드, 접근성의 4개의 요인으로 분석되었다. 둘째, 주거가치 요인 중 주거품질과 브랜드는 주거만족도와 투자가치에 유의미한 영향을 미치는 것으로 나타났다. 마지막으로 주택시장에서 구매자의 긍정적인 투자가치와 주거만족도는 매입의도를 증가시키는 것으로 나타났다. 본 연구결과는 주택 구매자의 긍정적 투자가치와 주거만족도는 주택시장에서 매입의도를 증가시키는 것으로 나타났으며, 이는 결국 주택 수요자의 투자가치의 긍정적 전망이 주택 시장을 더욱 활성화 시킬 것임을 시사한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 C
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• pp.2090-2092
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• 2004

In this paper, the new measurement methodology of characteristics of the vibratory micro gyroscope using Quality factor and the resonant displacement was proposed. Because the Quality factor has a large error under the high Quality factor condition, it is difficult to analyze the characteristics of the vacuum packaged vibratory micro gyroscopes with the Quality factor. We analyzed mechanical characteristics of gyroscope with the value of Quality factor. We described measurement errors of mechanical characteristics of micro gyroscopes. The measured value of Quality factor is 47532 and error range of Quality factor is from -29.8 % to 73.9 %. The value of resonant displacement is 3.4${\mu}m$ and the measurement error is 2.9 %. From the result of Quality factor degradation and resonant displacement degradation, 1698 days and 1503 days were estimated as Time To Failure (TTF), respectively. The range of estimation error of Quality factor degradation and resonant displacement degradation is calculated from 1246 days to 1832 days and from 1456 days to 1537 days, respectively. We can analyze the characteristics of the vibratory gyroscope using the quality factor when the Quality factor is smaller than 10,000. Also we can analyze that using the resonant displacement when the Quality factor is larger than 10,000.

• 산업융합연구
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• 제1권2호
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• pp.107-124
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• 2003

With rapid growth and competition of electronic commerce through internet, various buying types and business models are being appeared. In this paper, we studied group buying which is new business model to consumer and factors affecting on trust and participation of group buying. The followings are the regression result of this study. First, familiarity factor, customer service factor, seal of security and product value factor made a significant effect on trust. Second, familiarity factor, perceived reputation factor, customer service factor, seal of security and product value factor made a significant effect on participation of group buying. Third, trust of group buying made a significant effect on participation of group buying. In this study, modeling and empirical test were implemented about structure of trust and participation of group buying. We can know where our group buying strategies should focus and which factor we should improve.

• 대한가정학회지
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• 제39권12호
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• pp.271-284
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• 2001

The purpose of this study was to find out the relationship of attitudes of parents and their unmarried adult child concerning the family value orientation. In addition to this study examined the relationship to child's family value orientation and related variables. The major findings 1) Gender, mother's value of marriage, religion were influential factors on the child's value of marriage.2) Gender and mother's value of sex role were influential factors on the child's value of sex role. 3) Child's gender was only influential factor on child's value of child. 4) Gender, mother's value of filial piety, father's value of filial piety were significant factors which have some effects on child's attitudes toward value of final piety. 5) Gender, mother's value of familism, religion were significant factors which have some effects on child's attitudes toward value of familism. 6) Gender, mother's family value orientation, father's family value orientation were influential factors on child's family value oreintation. In conclusion, this study found that child's gender was the most influential factor on child's family value orientations. And mother's family value orientations had strong effects on children's family value orientations.

• 한국의류학회지
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• 제31권3호
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• pp.376-386
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• 2007

The purposes of this study were to reveal the relation of consumer value variables and to identify the difference of clothing information exploration behaviors on consumer value variables. The data were collected from 267 college women residing in Gwangju using a Questionnaire to general value, clothing value, consumption value and clothing information exploration behaviors. It were analyzed with factor analysis, cluster analysis, T-test, ANOVA and multiple regression analysis using statistical program SPSS 10.0. The results of this research were as follows: 1. Only one factor of general value had a significant influence on 'practical' of clothing value. All of general value and clothing value had a significant influence on the whole consumption value. 2. Clothing information search behaviors was divided into three factors: 'variety pursuit' 'active information collection' and 'uniqueness pursuit'. General value group had a significant difference in 'variety pursuit' and 'active information collection' behavior. Clothing value and consumption value group had a significant difference in all factors of clothing information search behaviors. By implication, this study could be explain each contributions of consumer values and suggest useful variable of consumer values in future clothing behaviors research.

• 한국지역지리학회지
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• 제17권4호
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• pp.443-458
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• 2011

본 연구는 지리 정보량에 따른 고등학생들의 공간 인식 변화에 대해 지가 형성 요인을 중심으로 살펴보는 것을 목적으로 하고 있다 사례 연구 지역은 송탄관광특구의 일부 지역으로 설문 대상 학생들에게는 생소한 지역이다 연구 결과는 다음과 같다. 첫째, 구시가지와 신시가지인 두 지역의 '최고가라고 학생들이 인식하는 표준지와 그렇게 인식한 이유'에 대한 분석 결과, 최고가 표준지의 지가 형성 요인으로 절대적 요인보다는 상대적 요인이 더 중요하다고 인식하고 있다. 둘째, 특성이 다른 두 지역의 최고가 표준지의 선택 이유에 대한 인식에서 차이를 보이고 있다. 셋째, 같은 지역이더라도 지리 정보량에 따라 지가 형성 요인에 대한 인식이 변하고, 제공한 지리 정보량이 늘어나면서 최고가 표준지의 선택율도 증가하였다. 마지막으로, 어떤 지역의 지가 형성에 결정적인 영향을 미치는 시설이 존재한다고 인식하고 있다.