• Communications for Statistical Applications and Methods
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• 제19권3호
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• pp.501-506
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• 2012

This paper investigates the central subspace related with SIR, DOC and SAVE when the response has more than two values. The subspaces constructed by SIR, DOC and SAVE are investigated and compared. The SAVE paradigm is the most comprehensive. In addition, the SAVE coincides with the central subspace when the conditional distribution of predictors given the response is normally distributed.

• Journal of the Korean Data Analysis Society
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• 제20권6호
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• pp.2733-2746
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• 2018

The two inverse regression estimation methods, SIR and SAVE to estimate the central space are computationally easy and are widely used. However, SIR and SAVE may have poor performance in finite samples and need strong assumptions (linearity and/or constant covariance conditions) on predictors. The two non-parametric estimation methods, MAVE and dMAVE have much better performance for finite samples than SIR and SAVE. MAVE and dMAVE need no strong requirements on predictors or on the response variable. MAVE is focused on estimating the central mean subspace, but dMAVE is to estimate the central space. This paper explores and compares four methods to explain the dimension reduction. Each algorithm of these four methods is reviewed. Empirical study for simulated data shows that MAVE and dMAVE has relatively better performance than SIR and SAVE, regardless of not only different models but also different distributional assumptions of predictors. However, real data example with the binary response demonstrates that SAVE is better than other methods.

• 한국정보전자통신기술학회논문지
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• 제1권1호
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• pp.13-19
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• 2008

본 연구를 통해 Maya SDK와 API, MEL 기술을 이용하여 Backup save가 가능한 plug-in 개발과 Maya 프로그램 안에 구현해 보고 각종 응용 프로그램 활용 가능성을 고찰하고자한다. 현재 활용되어지고 있는 Maya의 다양한 plug-in들 중에서 개발자들의 고충이라 여겨지는 파일관리와 저장시의 보관의 어려움에 대해 분석하여 Backup save이 가능한 다양한 방법을 파악하고, Backup save plug-in을 통해 중복파일와 기존파일의 불의의 수정을 미연에 방지해 개발자의 능률을 높이고자하는데 목적을 두고 그래픽 개발자 측면에서 백업저장이 Maya 프로그램 활용능력과 데이터 유지 보수를 향상시킬 수 있는 가능성을 고찰 하였다. Maya 소프트웨어에서 백업저장 기능으로 구현된 plug-in 기반 솔루션은 다양한 응용 소프트웨어에서도 응용될 수 있다고 판단된다.

• 한국산업정보학회논문지
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• 제22권3호
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• pp.13-18
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• 2017

본 논문에서 802.11 무선랜의 Power Save Multi-Poll (PSMP) 동작에 대한 성능을 수학적으로 분석한다. 수학적 분석을 통하여 우리는 전체 동작 시간 중 전력 소비에 사용되는 시간을 구함으로써 전력 소비 효율을 얻는다. 수학적 분석을 통하여 PSMP 동작의 효율성을 예측할 수 있다.

• Communications for Statistical Applications and Methods
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• 제30권2호
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• pp.179-189
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• 2023

Hybrid sufficient dimension reduction (SDR) methods to a weighted mean of kernel matrices of two different SDR methods by Ye and Weiss (2003) require heavy computation and time consumption due to bootstrapping. To avoid this, Park et al. (2022) recently develop the so-called cross-distance selection (CDS) algorithm. In this paper, two variations of the original CDS algorithm are proposed depending on how well and equally the covk-SAVE is treated in the selection procedure. In one variation, which is called the larger CDS algorithm, the covk-SAVE is equally and fairly utilized with the other two candiates of SIR-SAVE and covk-DR. But, for the final selection, a random selection should be necessary. On the other hand, SIR-SAVE and covk-DR are utilized with completely ruling covk-SAVE out, which is called the smaller CDS algorithm. Numerical studies confirm that the original CDS algorithm is better than or compete quite well to the two proposed variations. A real data example is presented to compare and interpret the decisions by the three CDS algorithms in practice.

• 한국안전학회지
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• 제11권1호
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• pp.99-107
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• 1996

This survey is to compare the the number of accidents which were occurred in 24 construction companies with the average accident in construction industry. The number of accidents in 24 companiesis is lower than the average accident, then it is classified "save", otherwise it is classified "loss". This survey is conducted to have top management be interested and invest for safety by recognizing that safety management could be profit for the company. The result of this survey is as follows : The total save amount in 1992 is 44,780mi11ion Won and average is 1,870mi11ion Won, with being 11, 200mi11ion Won by reduction amount of deaths and 33,580mi11ion Won by reduction amount of injuries. In 1993 the total is 33,330mi11ion Won and average is 1,390mi11ion Won, and in 1994 the total is 38, 720mi11ion Won and the average is 1,610mi11ion Won. This result is save amount of workmen's compensation insurance with excluding the indirect costs for accidents. The company which ranked the highest save amount is B Construction Company with being 15.1 billion Won and the next is A Construction Company during 3 years. The Company which ranked highest percentage of save amount to sales amount is Q Heavy industry with being 0.359% and the next is B Construction Company during 3 years.pany during 3 years.

• 한국언론정보학보
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• 제62권
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• pp.74-94
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• 2013

본 연구의 목적은 크게 세 가지로 우선 중국인의 '오프라인에서의 개인의 의견표명'과 '온라인에서의 개인의 의견표명' 간의 상관관계를 검증하는 것이다. 다음으로 '체면'과 '오프라인에서의 개인의 의견표명' 및 '온라인에서의 개인의 의견표명' 간의 상관관계를 검증하는 것이다. 마지막으로 '오프라인에서의 개인의 의견표명'과 '온라인에서의 개인의 의견표명' 사이에서 '체면'이 매개변인 역할을 하고 있는지를 검증하는 것이다. 그 결과 중국인의 오프라인에서의 의견표명 행위는 온라인에서의 의견표명 행위와 상관관계를 나타내고 있었다. 오프라인에서 의견표명을 나타내려 하는 사람은 온라인에서도 의견표명을 나타내려 하는 경향을 보였다. 그리고 사람들의 '의견표명 행위'에 노엘 노이만이 제시하고 있는 '고립에 대한 공포' 요인만이 아닌 '체면' 요인 역시도 영향을 나타내는 것으로 나타났다. '체면'을 중시하는 사람은 상대적으로 '개인 의견표명'을 하지 않으려는 경향을 나타냈다. 또한 '체면' 요인 중 '장소체면'은 '오프라인에서의 개인의 의견표명'과 '온라인에서의 개인의 의견표명' 모두에 부분적으로 매개 역할을 하고 있는 것으로 나타났다.

• 대한가정학회지
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• 제34권2호
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• pp.201-215
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• 1996

The purpose of the study was to examine the effects of household characteristics to family savings. Family savings were defined in four ways such as monthly savings, average propensity to save, financial assets, and net financial assets. The household characteristics dealt with were family income, household size, number of earners, age, occupation, education, housing tenure, and urbanization. The data used in the study was Survey of Family Finance 1990. The main statistical method was multiple regression. Family income was found to the most important variable to determine four family saving variables holding other characteristics constant. Also, household size had significant negative effects on family savings. Two-earner households were found to have higher average propensity to save and less financial assets compared to single-earner households. Fro monthly savings and average propensity to save, the households with forties andfifties household head tended to be less than others, while financial assets tended to increase with the age of household head. Compared to salary earner households, blue-colored households had significantly lower average propensity to save, and the households with professionals had significantly higher financial assets. The college-graduated households tended to have less monthly savings than the elementary-graduated households. Also, the housing renters were found to have more monthly savings and higher average propensity to save, compared to the housing owners.

• 대한가정학회지
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• 제34권2호
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• pp.245-259
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• 1996

The purpose of this paper is to analyze the relative importance of consciousness towards savings / consumption and motivation to save in explaining the proportion of savings in household. For these purpose, a survey was conducted using questionnaires on 453 households. The results showed that (1) family income had not significant effect on the proportion of savings in household, (2) the proportion of family savings was high in the group of families who showed positive consciousness towards savings, (3) motivation to save was associated with the proportion of savings in terms of significant relationship.

• 응용통계연구
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• 제31권6호
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• pp.835-842
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• 2018

충분차원축소의 대표적 방법론 중 하나인 sliced average variance estimation (SAVE)은 슬라이스라고 불리우는 반응변수의 범주화의 총 수에 민감하다고 알려져 있다. 이러한 점을 극복하기 위한 방법으로 최근에 다양한 수의 슬라이스로부터 얻어진 SAVE의 정보를 결합하는 fused SAVE (FSAVE)가 개발되었다. 본 논문에서는 소위 large p-small n 자료라고 불리우는 자료의 수가 변수의 수보다 적은 자료에서 FASVE가 어떻게 실제적으로 사용될 수 있을지에 대해 실증적 분석을 하고자 한다. 이를 위해 근적외분광분석을 통해 얻어진 비스킷 자료를 이용할 것이고, 이러한 자료분석에서 FASVE에 의한 차원축소에 의해 분석된 결과가 기존의 방법론에 비해 우수함을 보고자 한다.