• 상하수도학회지
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• 제30권6호
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• pp.623-634
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• 2016

Sewer condition assessment involves the determination of defective points and status of aged sewers by a CCTV inspection according to the standard manual. Therefore, it is important to establish a reliable and effective standard manual for identifying the sewer defect. In this study, analytic reviews of the CCTV inspection manuals of the UK, New Zealand, Canada and South Korea were performed in order to compare the defect codes and the protocols of condition assessment. Through this, we also established the standardized method for defect code and revised the calculation method of assigning the condition grade. Analyses of the types and frequencies of sewer defects that obtained by CCTV inspection of 7000 case results, showed that the joint defect and lateral defect were the most frequent defects that occurred in Korea. Some defect codes are found to be modified because those did not occur at all. This study includes a proposed new sewer defect codes based on sewer characteristics.

• 한국생활과학회지
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• 제8권1호
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• pp.63-79
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• 1999

The purpose of the study is to investigate the relationships between food expenditures and household socio-economic characteristics. Data used were taken from the 1996 National Survey of Family Income and Expenditure Survey. This study revealed that total food expenditures for urban salary and wage earner households were 347,798 won, which accounted for 27.0 percent of the total consumption expenditures and food away from home expenditures marked for 8.4 percent of the total consumption expenditures. Household income, household size, age of household head, occupation of household head, education of household head, housing tenure, wife's employment status, gender of household head, and children's age were all important factors in predicting the food consumption expenditures for urban salary and wage earner households.

• 아동학회지
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• 제29권1호
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• pp.227-241
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• 2008

This research explored contemporary cities and children's lives in picture books by a survey of 71 picture books published and translated into Korean from 1996 to 2006. These books represented city or urban life as their settings with children or personified animals as their main characters. They were classified by four categories. Results were the city space that most frequently appeared in the picture books were streets (73%) including downtown (38%) and back streets (6%). Emotions displayed by children in the city were mainly negative feelings (60%) including fear, worry, sadness, and boredom. The most important issue was alienation (28.5%). Main characters barely managed to cope with life in the city (76%).

• 가정과삶의질연구
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• 제10권1호통권19호
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• pp.95-113
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• 1992

The purpose of this study was to figure out the urban establishing families' marriage costs and first housing costs. For the purpose 274 establishing families in Seoul and its metropolitan area were interviewed through the stadardized questionnares. Finally 264 questionnares were analyzed. The major findings were as follows ; 1) The total marriage costs of urban establishing families were very high and the contents were very ritualistic. In higher education group, the total costs were high relatively. This was the case in first housing costs. 2) Their marriage costs were very dependent on their parent, the dependency were stronger in high education group compared to the low. This ware the case in first housing costs. 3) The total marriage costs were higher than the first housing costs. This tendency was stronger in low education group compared to the high.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 1999년도 Proceedings of International Symposium on Remote Sensing
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• pp.405-410
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• 1999

Topographic maps can be made and updated with satellite images, but it requires many human interactions that are inefficient and costly. Therefore, the automatizing of the road extraction procedures could increase efficiency in terms of time and cost. Although methods of extracting roads, railroads and rivers from satellite images have been developed in many studies, studies on the road extraction from satellite images of urbanized area are still not relevant, because many artificial components In the city makes the delineation of the roads difficult. So, to extract roads from high resolution satellite images of urbanized area, this study has proposed the combined use of wavelet transform and multi-resolution analysis. In consequence, this study verifies that it is possible to automatize the road extraction from satellite images of urbanized area. And to realize the automatization more completely, various algorithms need to be developed.

• World Technopolis Review
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• 제3권3호
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• pp.122-138
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• 2014

The number of environment-related technologies has increased remarkably over the past two decades, as has the public's interest in effective resource use and ways to reduce the effects of global warming. Industries that are based on environment-related technologies are thus growing rapidly. Previous studies revealed that externalities derived from the population concentration in urban areas positively affect agglomerations of high-tech industries. Such externalities have been named the "knowledge spillover effect". The purposes of the present paper are to (1) give a thumbnail sketch of the locations of environment-related industries around the world, using the Organisation for Economic Co-operation and Development environment-related patent statistics, and (2) explicate the effects of the Marshall-Arrow-Romer (MAR) and Jacobs externalities, which result from population concentrations in urban areas, on the agglomeration of environment-related industries in Sweden. The analysis revealed that environment-related industries are located chiefly in urban areas across the globe, and that only the MAR externalities influenced positively on the agglomeration of these industries in Sweden.

• 아동학회지
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• 제8권2호
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• pp.73-98
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• 1987

This research studied common opinions of parents about child welfare that have been diffused into urban communities in Korea. They were analyzed into major dispositions-anti-collectivists, reluctant collectivists, Fabian Socialists, Marxists-by demographic variables of sex, age, education, occupation, income, and religion. A questionnaire of 18 items was distributed to 1170 parents in the Seoul area who had more than one child under 18 years of age. The returns of 815 parents were analyzed with the statistics of frequency, percentage, and one-way ANOVA. The results of this study showed that (1) The opinions of parents on child welfare in urban communities had tendencies toward Fabian Socialists and reluctant collectivists ; (2) Major demographic factors were education and occupation, but the variables of sex, age, income and religion were not significant.

• Journal of information and communication convergence engineering
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• 제9권1호
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• pp.64-68
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• 2011

On the limited urban area, precise measurement of meteorological data is not easy for the cost problem. The facilities collecting the data require high installment costs. The mobile sources can be a solution in city region. For example, a public bus on which some meteorological sensors are installed can act as moving information gathering station. The information is gathered on a server and aggregated to generate useful information for smart phone application. To implement the services, several obstacles are exists. This paper studies on a design of this mobile meteorological information service system for urban area.

• Carbon letters
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• 제9권1호
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• pp.17-22
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• 2008

A carbon nanotube (CNT) of diameter ~20 nm has been synthesized by spray pyrolysis of turpentine oil using Ni/Fe catalyst. Pellet of CNTs has been used as a target to produce semiconducting carbon thin film of band gap 1.4 eV. Presence of oxygen pressure in the pulse laser deposition (PLD) chamber helped to control the $sp^3/sp^2$ ratio to achieve the desired band gap. Results are discussed with the help of Raman spectra, SEM TEM micrographs and optical measurements suggest that semiconducting carbon thin film deposited by PLD technique has retained its nanotubes structure except that its diameter has increased from 20 nm to 150 nm.

• 가정과삶의질연구
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• 제14권1호
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• pp.97-112
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• 1996

This study is (1) to analyze urban employed husbands' time use applying a framework which classifies a day into public time familial time and individual time in order to demonstrate its disproportion in terms of their and their families' welfare(2) and to identify the related factors to their time use. Data for 280 husbands were gathered through structured questionnaire and time diary. Major findings are as follows; (1) Husband's time allocation is usually concentrated on their individual and public time while they spend relatively very short familial time. (2) Types of occupation age and wives' employment status are all related with husbands; time use but their sex-role attitude shows no significant relation.