• 가정과삶의질연구
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• 제2권1호
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• pp.165-177
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• 1984

The purpose of this study was to investigate satisfaction with the function of interior space of apartment and factor which influence it, and then to provide housing practitioners with basic data for more desirable apartment interior environment. On the basis of the review of literature, questionnaire was developed. The sample was classified into type of unit floor plan and house size of 17 districts in Seoul. 139 households were selected in three districts which were the first three regions of high apartment density. Data were analyzed by computer using frequency, percentage, mean, standard deviation, F-test, Duncans multiple range test, η2 , person's product moment correlation coefficient. the results are as follows: Factors which influence satisfaction with the functionality of interior were household size and family life cycle as sociodemographic variable, and type of unit floor plan as physical variable. It was shown that the satisfaction with the functionality of interior was related to satisfaction with the external environment. More specifically, (1)the smaller a household size was the more the owner became satisfied. (2)households were in the stage of establishment in the family life cycle and households with C type of unit floor plan showed higher degree of satisfaction. (3) satisfaction with the functionality of interior had positibly related to satisfaction with the external environment.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2007년도 춘계학술대회 논문집
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• pp.229-230
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• 2007

• 한국주거학회논문집
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• 제17권3호
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• pp.19-30
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• 2006

The purpose of this study was to compare the characteristics of floor plan of $85m^2$-sized housing units with 2-bay and 3-bay and the residents' satisfaction with them. The subjects for analyzing floor plan were six floor plans of $85m^2$-sized housing units with 2-bay and nine floor plans of housing units with 3-bay in the new town, Hwamyeong-dong, in Busan. The floor plans were analyzed based on seven characteristics of floor plans such as the composition type of entrance core hall, the entrance arrangement, width and depth of the housing unit, size of each room, LDK arrangement, arrangement of family bathroom and private bathroom for husband and wife, and balcony arrangement. The subjects for grasping satisfaction with each housing unit were 400 residents of $85m^2$-sized housing units. A half of them lived in housing units with 2-bay and another half of them with 3-bay in the same area. They answered about the degree of satisfaction with the characteristics of each room and the preferred floor plan type if they move to the same size housing units through a questionnaire. The results were as follows; First, the floor plan with 3-bay had more diverse elements than one with 2-bay. Second, the residents who lived in 3-bay housing unit were younger, higher education, and higher income than the ones in 2-bay. Third, the residents who lived in $85m^2$-sized housing unit were more satisfied with and preferred to 3-bay housing units than 2-bay one.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2000년도 추계학술발표대회 및 bio-venture fair
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• pp.745-748
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• 2000

Anaerobic digester coupled with hollow fiber membrane unit. Treatment of starch waste with anaerobic digester-membrane system was studied. $0.17\;m^2$ area of hollow fiber membrane unit of known pore size was immersed into laboratory-scale anaerobic digestion system. The gas production was about $0.74\;m^3/kg$ COD treated. The COD removal efficient was about 80-95% depending on the hydraulic retention time. Crossflow ultrafiltration as Post treatment to anaerobic filter. The study conducted with different membrane pore size indicated that membrane with 1,000,000 molecular weight cut-off size gave a higher COD removal efficiency in the range of 83-87% while giving a study flux of $120-130\;L/m^2\;{\cdot}\;h$. A study was conducted to see the long term clogging effect of membrane also.

• 한국광학회지
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• 제19권1호
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• pp.43-47
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• 2008

현재 TFT-LCD(Thin Film Transistor Liquid Crystal Display)에 사용되는 BLU(Back Light Unit) 패턴 크기는 수 십 ${\mu}m$인데 반해, 최근에는 BLU 패턴의 크기를 수 ${\mu}m$ 또는 그 이하로 조절함으로써 출력광의 휘도를 증가시키고 균일도를 향상시키고자 하는 연구가 진행되고 있다. 본 연구에서는 패턴의 크기, 분포 및 점유 면적이 출력광의 분포에 미치는 영향을 조사하였다.

• Carbon letters
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• 제9권1호
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• pp.28-34
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• 2008

Multidirectional reinforcement is aimed primarily at overcoming interlaminar weakness, hence a major interest lies in the mechanical properties of multidirectional carbon/carbon composites. Mechanical properties depend on the type of carbon fiber, the size of the fiber bundle, the spacing of the bundles, the angles of the bundles relative to the axes of the block, and matrix formation. In the present studies, PAN based carbon fiber preforms manufactured different size of unit cell have been prepared. Densification of these used high pressure infiltration and carbonization technique with coal tar pitch as matrix precursor was carried out. Scanning electron microscopy has been used to study the fracture behavior of composites. The size of unit cell of the preforms has considerably affected on the flexural properties as well as microstructure of the carbon/carbon composites.

• 한국주거학회논문집
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• 제13권6호
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• pp.101-110
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• 2002

The purpose of this study was to examine needs of residents on the storage according to unit size in apartment. In order to achieve our goal, the questionnaire survey was used. We sampled the questionnaire surveys of 250 households in Seoul whose apartment sizes had been more than 20 pyung. The data collected by the questionnaire survey was analyzed by examining the frequency, percentage on the SPSS/PC+. The results of the study were obtained as follows: 1) In research on the actual storage condition, Residents tended to feel constraint on the storage of the season goods and the storage satisfaction on the service area was found lowest. Therefore, there needed to design the balcony more efficiently for the storage and the interior storage for the season goods. 2) In research on consciousness and attitude about the storage, residents tended to keep the goods of no use and prefered to arrange neatly rather than use conveniently. Therefore, there needed more efficient space in the balcony for the storage of the goods of no use and the closed furniture rather than the open furniture was suited for arrangement. 3) In research on the storage needs, needs for the built-in furniture in all apartment sizes showed highly and residents wanted a space for the exclusive use of the storage. In a solution, it was proposed to equip with the interior storage and the exterior cooperative storage. In the conclusion, needs of residents on the storage according to apartment size were different little. The small size apartment had the serious storage problems and wanted the efficient space plan for storage.

• 한국임상수의학회지
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• 제28권4호
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• pp.422-426
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• 2011

For a national survey in which wide geographic region or an entire country is targeted, multi-stage sampling approach is widely used to overcome the problem of simple random sampling, to consider both herd- and animallevel factors associated with disease occurrence, and to adjust clustering effect of disease in the population in the calculation of sample size. The aim of this study was to establish sample size for estimating bovine tuberculosis (TB) in Korea using stratified two-stage sampling design. The sample size was determined by taking into account the possible clustering of TB-infected animals on individual herds to increase the reliability of survey results. In this study, the country was stratified into nine provinces (administrative unit) and herd, the primary sampling unit, was considered as a cluster. For all analyses, design effect of 2, between-cluster prevalence of 50% to yield maximum sample size, and mean herd size of 65 were assumed due to lack of information available. Using a two-stage sampling scheme, the number of cattle sampled per herd was 65 cattle, regardless of confidence level, prevalence, and mean herd size examined. Number of clusters to be sampled at a 95% level of confidence was estimated to be 296, 74, 33, 19, 12, and 9 for desired precision of 0.01, 0.02, 0.03, 0.04, 0.05, and 0.06, respectively. Therefore, the total sample size with a 95% confidence level was 172,872, 43,218, 19,224, 10,818, 6,930, and 4,806 for desired precision ranging from 0.01 to 0.06. The sample size was increased with desired precision and design effect. In a situation where the number of cattle sampled per herd is fixed ranging from 5 to 40 with a 5-head interval, total sample size with a 95% confidence level was estimated to be 6,480, 10,080, 13,770, 17,280, 20.925, 24,570, 28,350, and 31,680, respectively. The percent increase in total sample size resulting from the use of intra-cluster correlation coefficient of 0.3 was 22.2, 32.1, 36.3, 39.6, 41.9, 42.9, 42,2, and 44.3%, respectively in comparison to the use of coefficient of 0.2.

• Journal of the Korean Statistical Society
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• 제30권2호
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• pp.281-290
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• 2001

Symmetric estimation and recursive mean adjustment are considered to construct tests for the doble unit root hypothesis for both parametric and semiparametric time series models. It is shown that simultaneous application of symmetric estimation and recursive mean adjustment yields the most powerful test. Moreover, size property of the semiparametric test based on the simultaneous application is bet among all semiparametric tests.

• KSBB Journal
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• 제6권2호
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• pp.135-141
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• 1991

This study thus looks into two treatment processess : i) Anaerobic digester coupled with hollow fibre membrane unit. Treatment of starch waste with anaerobic digester-membrane system was studied. $0.17\m^2$ area of hollow fibre membrane unit of known pore size was immersed into laboratory-scale anaerobic digestion system. The pore size of membrane was varied from 0.03 to $\0.15mu$m. The hydraulic retention time of anaerobic digester was varied from 1.5 to 10 days. The effect of hydraulic retention time on treatment efficiency was significant while effect of membrane size was not significant. The gas production was about 0.74㎥/kg COD treated. The COD removal efficient was about 80-95% depending on the hydraulic retention time. ii ) Crossflow ultrafiltration as post treatment to anaerobic filter. The effluent from anaerobic filter, which had a total COD in the range of 4,500-5,200 mg/L was treated by crossflow ultrafiltration units. The study conducted with different membrane pore size indicated that membrace with 1,000,000 molecular weight cut-off size gave a higher COD removal efficiency in the range of 83-87% while giving a study flux of $120-130 L/\m^2$.h. A study was conducted to see the long term clogging effect of membrane also.