• Proceedings of the Korean Institute of Building Construction Conference
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• 2020.11a
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• pp.145-146
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• 2020

This study investigated the performance evaluation of polymer cement mortar for repairing concrete structures using calcium nitrite(Ca(NO₂)₂) and CO₂ nano-bubble mixing water to develop section-restoration methods for the repair and reinforcement of cracks. The evaluation items were strength and microstructure analysis at 28 days of age according to the change in the amount of calcium nitrite and the use of CO₂ nano-bubble water. As a result of the experiment, it was confirmed that the performance of polymer cement mortar for repairing concrete structures was improved by the generation of nitrite-based hydration products when calcium nitrite and CO₂ nano-bubble water were used.

• Journal of the Korean housing association
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• v.18 no.2
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• pp.39-47
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• 2007

The objective of this study is to analyze the space usage and user evaluation of community facility in High rise Mixed-use Apartment. This study was conducted case study and questionnaire survey. Four High rise Mixed-use Apartments built since 2000 were chosen for case study and 166 residents were collected for questionnaire survey. The frequency, percentage, mean, t-test and F-test were executed through SPSS for Win 12.0 statistics package program. The types of community facilities of High rise Mixed-use Apartments were consisted of sports, child care/study, information sharing, leisure/cultural facilities. The usage percentage of community facilities increased since the residents have moved to their current residence of High rise Mixed-use Apartments from their previous residence. The most satisfactory facility was sports facilities. The satisfaction of community facilities showed high in general. The satisfaction of community facilities was significant with gender and age.

• Proceedings of the SAREK Conference
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• 2009.06a
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• pp.762-767
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• 2009

Some types of semi-Volatile organic compounds (SVOC) that are emitted from plastics used in building materials and household appliances have associated health risks, even at low concentrations. In this study, micro chamber method for measuring SVOC is introduced and SVOC such as di (2-ethylhexyl) phthalate and butylated hydroxyltoluene emitted a flooring material were measured using a micro chamber method. Airflow characteristics in a micro test chamber deeply depended on air exchange rate. From the evaluation using an index of air change efficiency, such as the air age and the coefficient of air change performance, a fixed air exchange rate of $1.5\;h^{-1}$ in the micro chamber is desirable.

• Proceedings of the KIEE Conference
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• 2004.11c
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• pp.3-5
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• 2004

Cleft lip is one of the most common congenital deformities in craniofacial region. Despite the many reports on the outcome of various surgical techniques from individual medical centers, the evaluation of the outcome is based on the subjective observation because of lack of the objective evaluation system. Therefore, a new technique of objective and scientific evaluation for the nasal deformity of secondary cleft lip and nose deformity is critical to improve the management of the cleft patients including the decision of optimal age of operation and surgical technique as veil as evaluation of the outcome. In this study, a new method was proposed to evaluate the nasal deformity using nostril angle, distance, and area of patient images. The images were also evaluated by three expert plastic surgeons, and put into scale of 5 percentile. Measurement results were compared between the each category and the surgeon's evaluation, and coefficients of each category were statistically tested. As a result, The normalized overlap area of right and left nostrils and distance ratio between two centers of nostrils showed high coefficient with evaluations of plastic surgeons.

• Proceeding of Spring/Autumn Annual Conference of KHA
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• 2003.11a
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• pp.103-107
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• 2003

The purpose of this study was to survey the residential satisfaction of the residents who lives in Bundang in order to offer the information helpful to housing designers and housing policy makers. Documentary research and questionnaire survey methods were used in this research. The sample was taken from 320 the residents living in Seoul. Data were analyzed with the SPSS PC+ window version. The results were as follows: 1) residents were satisfied with rather their housing unit than residential environment, 2) there is significant difference the evaluation of residential satisfaction according to the age of husband and wife, the educational level of wife, 3) there is significant difference the evaluation of residential satisfaction according to living area, housing type, housing size, homeownership, living period

• Journal of the Korean Home Economics Association
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• v.36 no.7
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• pp.69-82
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• 1998

The purpose of the study was to examine the adaptability of AAI(Adult Attachment Interview) in Korea. The subjects were 20 mothers who had toddlers from middle class. AAI was administrated to them. Interviews were audiotaped and transcribed verbatim. The results showed that Korean Mothers' AAI classifications were Secure-Autonomous(F) 60%, Insecure=Dismissing(Ds) 20%, Insecure-Preoccupied(E) 5%, Insecure-Unresolved/disorganized(U/d) 15%. The classification of AAI was significantly related with mothers' education, but not mothers' age. Autonomous mothers discribed consistently in evaluation of attachment-related experiences and valued attachment. Dismissing mothers showed a incoherent discourse and dismissed attachment-related experiences and relations. Preoccupied mother sticted to past attachment relationship and perplexed with evaluation of these experiences. Unresolved mothers showed lapse during discussion of loss or abuse and were not free from past experiences. Based on the findings of the study, it was found th AAI(Adult Attachment Interview) can be used for evaluation of mother's internal working model in Korean culture.

• KIEE International Transactions on Power Engineering
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• v.5A no.4
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• pp.322-330
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• 2005

This paper proposes methods to incorporate station related aging failures in composite system reliability assessment. Aging failures of station components, such as circuit breakers and bus bars, are a major concern in composite power system planning and operation as an increasing number of station components approach the wear-out phase. This paper presents probabilistic models for circuit breakers involving aging failures and relevant evaluation techniques to examine the effects of station related aging outages. The technique developed to incorporate station related aging failures are illustrated by application to a small composite test system. The paper illustrates the effects of circuit breaker aging outages on bulk system reliability evaluation and examines the relative effects of variations in component age. System sensitivity analysis is illustrated by varying selected component parameters. The results show the implications of including component aging failure considerations in the overall analysis of a composite system.

• Journal of the Korean housing association
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• v.15 no.6
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• pp.27-35
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• 2004

The purpose of this study was to survey the residential satisfaction of the residents who lives in Bundang in order to offer the information helpful to housing designers and housing policy makers. Documentary research and questionnaire survey methods were used in this research. The sample was taken from 320 the residents living in Bundang. Data were analyzed with the SPSS PC+window version. The results were as follows: 1) residents were satisfied with rather their housing unit than residential environment, 2) there is significant difference the evaluation of residential satisfaction according to the age of husband and wife, the educational level of wife, 3) there is significant difference the evaluation of residential satisfaction according to living area, housing type, housing size. homeownership, living period

• The Research Journal of the Costume Culture
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• v.17 no.3
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• pp.523-534
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• 2009

The purpose of this study is to categorize the dimensions of the visual evaluation of the costume details of the retro romantic fashion and to research on the costume details and the visual evaluation by evaluators' gender, age, and major, and on their preferences. Quantitative research were conducted for this study. Based on the pictures, 10 costume details were selected for the survey questions and data were collected. All 446 subjects who participated in this research were college students(males and females) residing in or near Seoul. Data were collected in September, 2008. The collected data were statistically analyzed using SPSS which included: factor analysis, Cronbach's $\alpha$ reliability analysis, three-way ANOVA, two-way ANOVA, one-way ANOVA, Duncan's multiple range tests, and the t-test. The results of visual evaluation of retro romantic fashion are as follows: First, as a result of the factor analysis of the costume detail evaluation, five factors including attractiveness, decorativeness, cuteness, retro, and femininity surfaced. Second, the gender difference in the results of the research revealed that women rated decorative, cute, retro, and feminine characteristics higher than men did. Third, there were significant interactive effects in attractiveness and femininity depending on costume details and evaluators' gender. Fourth, subjects majoring in fashion valued attractiveness and femininity of the stimulus over non-fashion majoring subjects. Fifth, there were significant differences in the preferences of costume details depending on gender.

• Journal of the Korea Concrete Institute
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• v.11 no.4
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• pp.157-167
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• 1999

Among several non-destructive testing methods, ultrasonic pulse velocity method and rebound index method have been widely used for the evaluation of concrete strength. However, such methods might not provide accurate estimated results since factors influencing the relationship between strength and either ultrasonic pulse velocity or rebound index are not considered. In this paper, the evaluation method of concrete strength using rod-wave velocity measured by impact-resonance method is proposed. A basic equation is obtained by the linear regression of velocity vs, strength data at specific age and then, aging factor is employed in the equation to consider the difference of the increasing rate between wave velocity and strength. Strengths predicted by the proposed equation agree well with test results. Furthermore, the combined method of rod-wave velocity and rebound index is proposed.