• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2005년도 봄학술 발표회 논문집(II)
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• pp.525-528
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• 2005

This study determines the best composite grade to minimize the void of aggregate mixture based on the maximum density theory in an attempt to suggest a mix proportion method design for asphalt mixtures. Study results show that the grading curve with the maximum mass per unit capacity of each aggregate mixture satisfied the KS standards and the optimum AP content to meet the optimal asphalt mixture void rate of 4$\%$ was 5.7$\%$, less than the optimum AP content of 6.5$\%$ suggested in the Marshal mix proportion method design. At the same time, the asphalt mixture produced based upon the suggested mix proportion method had a flow value 17$\%$ lower than that of asphalt mixture produced according to the Marshal method, while its density was greater by 0.06$\～$0.09. This suggests that the introduced mix proportion method design helps to improve the shape flexibility and crack-resistance of asphalt concrete.

• Journal of the Korean Data and Information Science Society
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• 제28권2호
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• pp.443-449
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• 2017

Estimation of population proportion like the distribution rate of LED TV and the prevalence of a disease are often estimated based on survey sample data. Population proportion is generally considered as a special form of population mean. In complex sampling like stratified multistage sampling with unequal probability sampling, the denominator of mean may be random variable and it is estimated like ratio estimator. In this research, we examined the estimation of distribution rate based on stratified multistage sampling, and determined some numerical outcomes using stratified random sample data with about 25% of missing observations. In the data used for this research, the survey weight was determined by deterministic way. So, the weights are not random variable, and the population distribution rate and its variance estimator can be estimated like population mean estimation. When the weights are not random variable, if one estimates the variance of proportion estimator using ratio method, then the variances may be inflated. Therefore, in estimating variance for population proportion, we need to examine the structure of data and survey design before making any decision for estimation methods.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2019년도 춘계 학술논문 발표대회
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• pp.182-183
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• 2019

In this study, the optimization of mixing proportion of press-forming board with blast furnace slag, pearlite and bottom ash was investigated using the response surface methodology. Ten Mixing proportions of specimens were designed by the response surface design, and then flexural failure load, moisture content and water absorption of specimens were measured. As a result of the reaction surface analysis based on the experimental results, it was possible to derive the optimal mixing proportion with the satisfaction of 93%.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2017년도 추계 학술논문 발표대회
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• pp.205-206
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• 2017

The purpose of this paper is to examine a reasonable share of cost in the apartment remodeling projects. Therefore, the case model of remodeling apartment was made up and then the rate of return by method of floor area change rate, method of proportion, method of investment earnings rate and method of proportion reflected business contribution were estimated. Consequently, the model by the method of proportion reflected business contribution presented 20.6% of rate in all apartment units.

• Computers and Concrete
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• 제11권3호
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• pp.183-199
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• 2013

To select a most desired mix proportion that meets required performances according to the quality of recycled aggregate, a large number of experimental works must be carried out. This paper proposed a new design method for the mix proportion of recycled aggregate concrete to reduce the number of trial mixes. Genetic algorithm is adapted for the method, which has been an optimization technique to solve the multi-criteria problem through the simulated biological evolutionary process. Fitness functions for the required properties of concrete such as slump, density, strength, elastic modulus, carbonation resistance, price and carbon dioxide emission were developed based on statistical analysis on conventional data or adapted from various early studies. Then these fitness functions were applied in the genetic algorithm. As a result, several optimum mix proportions for recycled aggregate concrete that meets required performances were obtained.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2022년도 춘계학술대회
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• pp.78-79
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• 2022

본 논문에서는 RGB-D 카메라를 이용하여 획득한 다수 사용자의 정규화된 스켈레톤의 신체 비율 분석을 통해 각 사용자의 구분 및 위치를 추적하는 기법을 제안한다. 이를 위해 3D 포인트 클라우드로부터 각 사용자의 3D 스켈레톤을 추출한 뒤 신체 비율 정보를 저장한다. 이후 저장된 신체 비율 정보를 전체 프레임에서 출력된 신체 비율 데이터와 유사도를 비교하여 전체 영상에서의 사용자 구분 및 위치추적 알고리즘을 제안한다.

• 한국디자인학회:학술대회논문집
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• 한국디자인학회 2002년도 봄 학술발표회 논문집
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• pp.74-75
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• 2002

• 한국식생활문화학회지
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• 제7권3호
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• pp.271-279
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• 1992

In this report, we investigated meal patterns by area, age, profession from the data of the Korean National Nutrition Survey which had been carried out in 1989. The proportion of home prepared meal was about 90% at breakfast and dinner, and 46.3% at lunch. People had meals outside of home mainly at lunch(31.1%), and usually ate restaurant meal(17.7%). The proportion of meal skipped was 7.1% at breakfast, 3.9% at lunch, and 1.2% at dinner. At large city, 10.3% of people skipped breakfast, it was the highest proportion among three areas(large city, small city, and rural area). Also, the proportion of meal outside of homes was the highest among all areas. In rural area, home prepared meal was prevalent for all meals. Among all age groups, people between 20 and 49 ate out most frequently. For people between age 16 and 19, meal skipping was frequent for breakfast and dinner, especially, 20.5% of girl skipped breakfast. At lunch, the proportion of meal skipping was the highest in age higher than 50 groups. Among all professions, people in service job skipped lunch and dinner at the highest proportion. Manager and deskworker skipped breakfast by 12.9% and they ate out at lunch by 82.5%.

• 한국생활과학회지
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• 제12권5호
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• pp.713-735
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• 2003

The purpose of this study was to investigate the effects of the characteristics of maternal social networks on maternal expectation for their own children to examine the path that social networks had an effect on the self-esteem and the emotional intelligence of children through maternal expectation for their own children. The data used in this study were collected from 524 fourth to sixth graders and their mothers residing in Daejeon using structured questionnaire. The major findings of the study were as follows : (1) Among social network characteristics, proportion of friends and neighbors, proximity, direction and interference had a negative effect, and proportion of mothers of child's friends, frequency of contact, intimacy, emotional support, service support had a positive effect on maternal expectation for their own children. (2) Among social network characteristics, proportion of mothers of child's friends had a direct effect and proportion of friends, neighbors, and mothers of child's friends, proximity, frequency of contact, intimacy, direction, emotional support, service support, and interference had an indirect effect on children's emotional intelligence through maternal expectation for their own children. (3) Among social network characteristics, proportion of kin and mothers of child's friends, intimacy, service support, material support and interference had a direct effect, and proportion of neighbors and mothers of child's friends, proximity, frequency of contact, direction, service support had an indirect effect on children's emotional intelligence through maternal expectation for their own children.

• 대한수의학회지
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• 제11권2호
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• pp.163-170
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• 1971

Since the report in 1946 on the first isolation of Japanese encephalitis virus in Korea, the disease is known to occur every year and has occasionally spread in epidemic proportion among human populations. Because of its public health importance, it was deemed highly desirable to gain specific information as to natural history of the disease in Korea if we are to accomplish our ultimate objective of controling the disease in Korea. There still remain, however, unknown factors as to the ecology of Japanese encephalitis virus in Korea. This paper presents the results of serologic study on Korean cattle, hog and horse by means of hemagglutination inhibition (H.I.) test. The serum specimens were collected from Korean cattle, hog and horse their estimated ages being 3 to 9 years, 6 to 24 months and 2 to 14 years respectively, by jugular puncture; in Seoul and Kyung-Ki are a from the first part of May to November last, 1968. The strain used was designated by M 5/596. The methods of H.I. test employed in this study were essentially simillar to those employed by Clark and Fred. The results obtained summarized as follows; 1. Of samples of cattle sera tested, 183 (98%) was found to be positive, H.I. antibodies showing the highest proportion, on September. The lowest proportion showed 81 (68%) of 117 samples, on June. 2. One hundred and ninety-five and 114 swine serum samples tested were all of positive in both on September and October respectively. The lowest proportion showed 92 (29%) of 314 on June too. 3. Ninety (99%) of 91 equine serum samples tested contained demonstrable H.I. antibodies the highest proportion, on August. The lowest proportion was 19 (27%) of 70 samples on June. 4. Implications of these findings in the ecology of Japanese encephalitis Seoul and Kyung-Ki area were discussed.