• Structural Engineering and Mechanics
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• v.32 no.1
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• pp.55-69
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• 2009

A quasi ideal importance sampling simulation method combined in the conditional expectation is proposed for the structural reliability estimation. The quasi ideal importance sampling joint probability density function (p.d.f.) is so composed on the basis of the ideal importance sampling concept as to be proportional to the conditional failure probability multiplied by the p.d.f. of the sampling variables. The respective marginal p.d.f.s of the ideal importance sampling joint p.d.f. are determined numerically by the simulations and partly by the piecewise integrations. The quasi ideal importance sampling simulations combined in the conditional expectation are executed to estimate the failure probabilities of structures with multiple failure surfaces and it is shown that the proposed method gives accurate estimations efficiently.

• Korean Institute of Interior Design Journal
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• no.17
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• pp.173-180
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• 1998

The aim of the study was to grasp the current trends and to predict the future trends of space composition characteristics by analyzing floorplans drawn by housewives as their ideal apartments. The content analysis method was used for this study. This research used data from a competition held in 1993 by a housing construction company. Among 3,102 floorplans collected 12,232 were selected by Proportional Stratified Sampling Method. The major findings are as follows; 1) Some major features were interpreted as current trends; respondents wanted new rooms that could accomodate various functions separated the private spaces from public trends; they wanted to expand the verandah both visually and actually put importance on the number of bathrooms and have the space for outdoor living and leisure activities.

• Journal of dental hygiene science
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• v.17 no.1
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• pp.12-19
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• 2017

The aim of this study was to investigate adult individuals' perceptions on the association between chronic diseases and oral health provide basic data required for motivating individuals to follow ideal oral health behaviors and boost their interests in oral disease prevention and treatment. Subjects in their 20s to 50s were selected through the convenience sampling method and eleven questions were set as factors and answered via self-administered questionnaires. To determine statistical significance, analysis of variance was used with the level of significance set at 0.05. The subjects' perception of the association between chronic diseases and oral health were analyzed with respect to their health behaviors. Individuals with relatively higher stress levels demonstrated higher levels of perception levels (p<0.05). Public education regarding the association between chronic diseases and oral health has not been ideally effective in South Korea. Thus, the general public's perceptions of the association between chronic diseases and oral health should be revised. In addition aspects regarding this matter should be enhanced within oral health education programs which often only focus on demonstrating the importance of oral health management so that individuals can get sufficient information on the association between chronic diseases and oral health.