• Korean Journal of Mathematics
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• 제27권3호
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• pp.779-791
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• 2019

In this paper, we consider derivation of an ordered ${\Gamma}$-semiring and introduce the notion of reverse derivation on ordered ${\Gamma}$-semiring. Also, we obtain some interesting related properties. Let I be a nonzero ideal of prime ordered ${\Gamma}$-semiring M and let d be a nonzero derivation of M. If ${\Gamma}$-semiring M is negatively ordered, then d is nonzero on I.

• 충청수학회지
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• 제2권1호
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• pp.15-35
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• 1989

In this paper, we give a characterization of an order ideal which is not necessarily positively generated in the ordered space of Hermitian matrices. Order properties for perfect subspaces are also studied along with other subspace order properties.

• Asian-Australasian Journal of Animal Sciences
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• 제15권7호
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• pp.925-931
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• 2002

Gibbs sampling algorithms were implemented to the multi-trait threshold animal models with any combinations of multiple binary, ordered categorical, and linear traits and investigate the amount of bias on these models with two kinds of parameterization and algorithms for generating underlying liabilities. Statistical models which included additive genetic and residual effects as random and contemporary group effects as fixed were considered on the models using simulated data. The fully conditional posterior means of heritabilities and genetic (residual) correlations were calculated from 1,000 samples retained every 10th samples after 15,000 samples discarded as "burn-in" period. Under the models considered, several combinations of three traits with binary, multiple ordered categories, and continuous were analyzed. Five replicates were carried out. Estimates for heritabilities and genetic (residual) correlations as the posterior means were unbiased when underlying liabilities for a categorical trait were generated given by underlying liabilities of the other traits and threshold estimates were rescaled. Otherwise, when parameterizing threshold of zero and residual variance of one for binary traits, heritability estimates were inflated 7-10% upward. Genetic correlation estimates were biased upward if positively correlated and downward if negatively correlated when underling liabilities were generated without accounting for correlated traits on prior information. Residual correlation estimates were, consequently, much biased downward if positively correlated and upward if negatively correlated in that case. The more categorical trait had categories, the better mixing rate was shown.

• 환경영향평가
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• 제25권2호
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• pp.124-140
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• 2016

본 연구는 한국노동패널(Korea Labor and Income Panel Study, KLIPS) 제1차~제15차년도 자료와 환경부에서 제공하는 수질자료를 이용하여, 개인의 전반적인 생활만족도(life satisfaction)가 수질오염으로 대표되는 환경오염에 의해 어떻게 영향을 받는가를 실증적으로 분석한 것이다. 서수적 순서를 가진 종속변수의 특성과 패널자료의 이질성을 감안하여 패널 확률효과 순서형 프로빗(panel random-effects ordered probit) 모형으로 추정하였다. 수질오염도를 반영하는 지표로는 생물화학적 산소요구량(biochemical oxygen demand, BOD), 총인(total phosphorus, TP) 농도를 사용하였다. 또한 기존의 연구에서와 같이 개인의 경제적 특성, 사회 인구학적 특성을 동시에 고려하였다. 분석 결과 BOD, TP 모두 개인의 생활만족도에 부정적인 영향을 미치는 것으로 나타났다. 그 외 다른 변수들은 선행연구에서 나타난 결과와 유사하다. 자신의 소득 증가, 연령, 기혼, 자가주택 보유, 건강, 여성, 높은 교육수준은 생활만족도에 긍정적인 영향을 미치며, 타인의 소득 증가, 실업자, 도시거주, 자영업자인 경우는 부정적인 영향을 미치는 것으로 나타났다.

• 한국경영과학회지
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• 제39권2호
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• pp.67-82
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• 2014

The purpose of this study is two-fold : the one is to examine the causal relationship between domestic large firms' win-win growth effort and their financial performance by fiscal years; and the other is to develop a quantitative win-win growth index to overcome the limitation of the current one mainly using a survey method developed by NCCP (National Commission for Corporate Partnership). To serve the first purpose, we take a sample of 128 large companies whose win-win growth indices as of year 2011 and 2012 were evaluated by NCCP. We use their respective fiscal year's financial data to select 62 candidate financial ratios, which are then used in subsequent empirical tests. For the tests, we employ ordered probit model with stepwise selection method and two-way ANOVA with randomized block design to identify which of the 62 financial ratios are statistically significant ones to affect the firms' win-win growth index as well as to determine if the firms' win-win growth effort would cause their financial performance positively. To serve the second purpose, we devise a model using the 123 firms' 45 financial ratios, which employs ordered probit model with stepwise selection, and the validation of the model follows. We claim that the model suggested in this study serve as an alternative complementing the current one as it can produce the index in a more objective and swift manner using the firms' publicized financial statements.

• 농촌계획
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• 제20권3호
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• pp.89-100
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• 2014

The purpose of this study is to investigate whether the effect of the Strong Small Farm Development Project by Rural Development Administration is positively associated with participating farmers. The data that used in this study is a survey data that targets 442 farming households who have participated in the strong small farm development project. This study applies ordered-probit model to evaluate level of the participants' satisfaction of the project. This study found that participants' level of satisfaction is closely associated by satisfaction level of project contents that contains education and consulting, friendly attitude toward the project, active participation of the project, and understanding of the project's contents and their importances. Based on research findings, this research provides some implications of future upbringing policy for strong small farms and the principal point of the policy that leads to succeed in implementing the project when formulating agricultural policy in participants view. the strong small farms.

• 한국콘텐츠학회논문지
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• 제9권2호
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• pp.242-251
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• 2009

본 연구는 CSR-노동기준 실행이 종업원 직무만족 및 조직몰입에 대한 기업의 기대수준에 미치는 영향을 분석하였다. 순서형 프로빗(Ordered Probit) 분석기법을 사용한 결과 평균적으로 CSR-노동기준의 실행수준이 높은 기업은 이러한 활동을 통해 종업원의 직무만족 및 조직에 대한 몰입이 향상될 수 있을 것으로 기대하고 있으며, 개별 지표들의 실행수준도 기대수준과 유의한 양의 관계에 있음을 확인할 수 있었다. CSR-노동기준 전체를 분석에 이용한 결과 기준지표 3인 '차별 없는 직장'과 기준지표 7인 '건강하고 안전한 직장'의 계수가 유의하게 나타났다. 따라서 차별 없고 안전한 직장을 만들기 위해 노력하는 기업일수록 종업원의 직무만족 및 조직몰입에 대한 기대가 높은 것을 확인할 수 있다. 아울러 본 논문의 분석결과 CSR-노동기준지표의 설계가 적절하게 이루어진 것으로 판단할 수 있다.

• 한국환경과학회지
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• 제23권2호
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• pp.171-180
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• 2014

This study provides the empirical results of the customers' necessity and intentions of purchasing weather index insurance using survey of asking the customers' recognition about weather insurance. In this article, we discovered that not only the customers' past experience of loss but also the extent of damage and the effects that change in weather would have on their firm are positively related to an intention to purchase weather index insurance. In addition, the level of premiums was significantly higher for the highly-intended group of willing to purchase weather index insurance than the comparison group.

• 한국사회복지학
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• 제62권4호
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• pp.103-128
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• 2010

본 연구의 목적은 제주지역사회에서 자원봉사활동에 참여하는 515명의 대학생을 대상으로 슈퍼바이저의 자율성지지, 자원봉사동기 및 지속의도간의 인과관계를 분석하는 것이었다. 상관관계분석, 공변 량구조분석을 통하여 다음과 같은 결과를 얻었다. 첫째, 자원봉사동기들은 서열화 된 상관패턴을 보여 주었다. 둘째, 자원봉사자가 지각하는 슈퍼바이저의 자율성 지지는 자율적 동기인 내재적 동기와 확인적 조절동기에 유의한 정(+)의 영향을 미쳤고, 통제적 동기(내사적, 외적 조절동기)에는 유의한 영향을 미치지 못하였으며, 무동기에는 부(-)의 영향을 미쳤다. 셋째, 자율적 동기인 내재적 동기, 확인적 조절동기들은 향후 자원봉사활동 지속의도에도 유의한 정(+)의 영향을 미쳤으며, 확인적 조절의 외재적 동기가 지속의도의 최적 예측변인으로 나타났다. 자원봉사영역에서 자기결정이론의 응용가능성과 유망성에 대하여 논의하였다.

• 한국수학교육학회지시리즈D:수학교육연구
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• 제14권3호
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• pp.249-262
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• 2010

Large Midwest university faculty members proposed the Science and Technology Enhancement Program Project (STEP) to improve students' learning in the secondary mathematics classroom using modules of inquiry-based teaching. The purpose of this study was to determine the impact of the STEP Project on students' attitude toward mathematics. Hierarchical linear models (HLM) were used to evaluate the impact of the STEP Project. The sample group for the study was 130 ninth grade students enrolled in Integrated Algebra I in a large urban school district. The school was one of eight secondary schools that participated in the STEP Project. The classes in the treatment group were three of five classes ordered in terms of the highest, middle, and lowest mean GPA. The control group consisted of two other middle GPA classes. The classes had an average of 25 students. Teachers who previously had been involved in the STEP Project taught all treatment and control classes. The inquiry-based teaching activities provided by the project were confined to the treatment classes. The survey measuring students' attitudes toward mathematics were obtained for both groups of students. The inquiry-based teaching affected students' attitudes toward mathematics (p < 0.07, ES = 3.07). Especially, students who had preexisting low attitudes toward mathematics were significantly affected by treatment (p < 0.02, ES = 0.02), while the treatment positively affected African American students overall at p < 0.08 (ES = 0.58).