• Journal of the Korean Solar Energy Society
• /
• v.33 no.6
• /
• pp.77-84
• /
• 2013

Degree-day method is very simple but essential index to estimate heating and cooling energy demand in buildings. It has been neglected, however, for the simplicity so it is difficult to find any DB for south Korean cities. Even meteorological department of S. Korea doesn't report the data officially. In this study, current methods that are being used in many countries are investigated and used to calculate degree-days of 35 south Korean cities with 30 years(1981~2010) historical data. The calculation result indicates that the error among 4 major methods are dependent on how daily or hourly temperature are treated in the calculation and how balance point temperature is defined. The errors of the methods are no larger than 6% relative to hourly degree-day method.

• Journal of the Korea Safety Management & Science
• /
• v.13 no.3
• /
• pp.107-114
• /
• 2011

Traveling salesman problem is to minimize the total cost for a traveling salesman who wants to make a tour given finite number of cities along with the cost of travel between each pair them, visiting each cities exactly once before returning home. Traveling salesman problem is known to be NP-hard, and it needs a lot of computing time to get the optimal solution, so that heuristics are more frequently developed than optimal algorithms. This study suggests a hybrid parallel genetic algorithm(HPGA) for traveling salesman problem The suggested algorithm combines parallel genetic algorithm, nearest neighbor search, and 2-opt. The suggested algorithm has been tested on 7 problems in TSPLIB and compared the results of existing methods(heuristics, meta-heuristics, hybrid, and parallel). Experimental results shows that HPGA could obtain good solution in total travel distance minimization.

• Proceedings of the Korean Geotechical Society Conference
• /
• 2002.03a
• /
• pp.567-574
• /
• 2002

Rapid urbanization of many cities require large scale constructions such as high rise buildings in difficult ground conditions. SIP(Soil-cement Injected Precast pile) type piles are tile most popular choice of foundation method in soft ground as well as layered ground in many cities in Korea since SIP offer negligible amount of noise and vibration. But SIP method of construction provide wide range of pile capacity depending on the construction method, equipment, ground conditions and quality control method etc. Therefore this paper intend to investigate the reliability of SIP pile in layered ground through a comparison of existing design formulars and SIP pile load test.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.7 no.1
• /
• pp.163-170
• /
• 2012

Most of the cities and countries have distressed themselves about the urban social problem caused by the concentration of industry and population. Especially, disorderly expansion of cities and infrastructure improvement in rapid urbanization have also come into question. For this reason, proven urban planning facilities and tightened regulation on city planning are indispensible to solve these serious problems that we face. There are lots of similar studies to verify how to cope with a rapid urbanization.

• Journal of the Korean Home Economics Association
• /
• v.29 no.1
• /
• pp.125-137
• /
• 1991

This study aims to offer basic data for development of the three generations sharing house plan, through finding out the relationship between family characteristics and the housing needs of the middle aged living in the middle and small cities. The 1029 questionnaires were used for this study, and data were analysed by canonical correlation analysis, factor analysis and multiple regression. The results are as follows. Their family characteristics influence housing needs for the three generations sharing house. Especially groups of female, neuclear family, family of higher S.E.S., less number of children. family living in the apartment houses and owner occupied house prefer more privacy between generations in the three generations sharing house.

• Journal of the Korean Home Economics Association
• /
• v.29 no.1
• /
• pp.189-201
• /
• 1991

The purpose of this study was to validate the KMBI(Korean Maternal Behavior Inventory). Subjects were 1179 mothers of 4th-6th graders in the elementary schools from 5 small and medium cities and 5 urban cities in Korea. Pearson's γ, Cronbach's α, Cramer'sν, one-way ANOVA were conducted for the statistical analyses. The major findings were as follows. 1. The reliability coefficient of the scale (α) were ranged 0.62-0.79 and 0.70-0.82. 2. The discriminant coefficients(ν)of the item were ranged 0.40-0.83. 3. By the analysis of multitrait-multimethod matrix, convergent validity coefficients(γ) were ranged 0.28-0.66: and discriminant validity coefficients(γ) were ranged 0.28-0.66. 4. Significant sex differences were found in the scores of Affection, Overprotection, Achievement, and Achieve Involvement: significant SES differences were found in the scores of Reasoning Guidance, Affection, Overprotection, Achievement, & Active Involvement: and significant region differences were found in the scores of Authoritarian Control and Achievement.

• Journal of the Korean Home Economics Association
• /
• v.38 no.12
• /
• pp.15-28
• /
• 2000

The purpose of this study is to analyze Adolescents spending habits and examine it. The data was collected from 1125 high school students and their parents nationwide. The resets are as follows. 1. About seventy eight percent of the responded students own relatively high-priced goods such as brand-name jeans (59.1%), a mobile phone (31.9%), perfume with a price of 50,000 won or more (26.5%), CD Player (24.4%) or electronic pocket diary (17.1%). The percentage varies according to region. 2. The Adolescents tendency for conspicuous consumption is reflected by 2.92 points out of a total 5 points, while their mothers'marks 2.18 points. By region, conspicuous consumption behavior is more common in Seoul than in other small and medium-sized cities and towns. Also, the more mother attribute children's behavior internally, the lower the childeren's competence is.

• KDI Journal of Economic Policy
• /
• v.42 no.3
• /
• pp.1-32
• /
• 2020

This paper studies urban growth in Korean cities. First, I document that population growth patterns change over time and that the current population distribution supports random urban growth. I confirm two empirical laws-Zipf's law and Gibrat's law-both of which hold in the period of 1995-2015, but do not hold in the earlier period of 1975-1995. Second, I find a systematic employment growth pattern of Korean cities in spite of the random population growth. I examine market access effects on employment growth. Market access, a geographical advantage, has a significant influence on urban employment growth. The market access effect is higher in the Seoul metropolitan area than in the rest of the country. This effect is stronger on employment growth in the manufacturing industry compared to employment growth in the service industry. These results are robust with various checks (e.g., different definitions of urban areas). The results here suggest that policymakers should consider geographical characteristics when they make policy decisions with respect to regional development.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2009.06a
• /
• pp.161-162
• /
• 2009

In Korea there are Passenger ships on 106 routes running out of 10 port cities. These cities, such as Mokpo, Masan, Incheon, are the main transportation hubs the island residents today. But most passenger ship companies in Korea are limited in income and mostly small in size. These small companies have many challenges to overcome and are slow to improve services. Frequent service cancellations, aging sailors and a decline in service are contributing factors.

• Korea journal of population studies
• /
• v.8 no.1
• /
• pp.20-46
• /
• 1985

The increase of the population has an effect on the increase of students. The high birthrate, which means the extension of enrollments in the future, requires preparation of enough facilities and equipment for education. However, the educational conditions of Korea are not yet developed, and in such a situation the increase of enrollments makes the improvement of educational conditions difficult. Besides, the influx of students into the large cities has made complex educational problems such as a decrease of students in the rural area and a change for the worse of the educational conditions in the urban area. For the development of education in such a situation, an emphasis should be put not only on security of a stable educational finance but also on activation of family planning project and curb of population influx into large cities in the realm of population policy. In addition, population education for the youth should be strengthened in order that they can have sound view of family life, married life, children, and sex moral. For the way the young married live has relationship with the number and quality of children in the future of our nation.