• Journal of Korean Society of Transportation
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• v.22 no.3 s.74
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• pp.7-16
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• 2004

The purpose of this study was to find the characteristics of travel behavior and accessibility in terms of spatial structure. We analyzed travel behaviors and accessibility using a mode choice model and the Complementary Accessibility Index(CAI). The urban spatial structures that were compared were a compact city (CC) versus a sprawled city (SC), and high residential density districts (HD) versus low residential density districts (LD). First, CC and HDs residents had a shorter commuting distance than the CC and LDs residents. Second, behavior models showed that the use of Private cars for commuting in SCs was found to be greater than private car use in CCs, and that public transportation modes would be encouraged in CCs. Third, changes associated with the time and cost of commuting by private car generally affect the demand for public transportation modes in the CC. Also, analysis of cross elasticity suggests that changes of subway travel time affect the demand for buses very elastically. Fourth, the CAI of SC and LD were superior to the CC and HD even though the SC inefficient urban forms in terms of spatial structure. So, the spatial distribution of population density was also found to be an important factor affecting accessibility and energy savings.

• Journal of the Korean Institute of Gas
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• v.24 no.6
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• pp.34-46
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• 2020

In order to supply stable natural gas in the future, it is necessary to forecast the demand in advance and secure the quantity of supply. In this paper, we propose a method of estimating the demand function of industrial natural gas, which is the core of the increase of domestic natural gas demand in the future. The cross-sectional data of 304 domestic industries were used to estimate the demand function of the industrial natural gas, and the effect of industry specific characteristics such as capital investment, manufacturing cost. Finally, the least absolute deviation estimation method which is robust to outliers and does not assume the homogeneity of the error term and the normality, And the results were derived. In addition, the economic value of industrial city gas was estimated using the price elasticity of industrial city gas. Therefore, it can be seen that the continuous expansion and supply of city gas to the industrial sector is beneficial at the national level, and the government needs to promote expansion through the industrial city gas support policy.

• Journal of Energy Engineering
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• v.8 no.1
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• pp.166-173
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• 1999

본 연구는 램지가격결정방식과 효율적요소가격결정방식을 이용하여 향후 국내 가스산업의 배관망공동이용시 발전용 천연가스의 가격 및 이용료 수준을 파악할 수 있는 천연가스 가격 결정의 이론적 모형을 도출하였다. 또한 사례분석을 통하여 램지가격결정방식(RCPR)과 효율적요소가격결정방식(ECPR)하에서 도출된 최적 가격 및 최적 이용료를 비교·분석하였고 결정변수들이 가격과 이용료에 미치는 영향에 대해서 분석하였다. 그 결과 RCPR에 의한 최적 이용료는 쿠르노 불완전 경쟁하에서 한계직접비용 보다 낮게 도출된데 반해서 ECPR에서는 한계직접비용보다 높게 도출됨으로써 가격결정방식에 따라 최적 이용료의 수준이 상이함을 보였다. 또한 도시가스용 및 발전용 가격은 RCPR 하에서 신규사업자 수가 증가할수록 하락하였고 이용료는 증가하여 한계비용에 접근하였다. 한편 최적 발전용 가격과 최적 이용료는 한계직접비용이 클수록 증가되었고, 역가격탄력성이 클수록 최적 발전용 가격은 증가하는 반면에 최적 이용료는 감소하였다.

• KDI Journal of Economic Policy
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• v.16 no.1
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• pp.195-216
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• 1994

탈세(脫稅)의 규모추정(規模推定)을 위해서는 우선 과세표준의 누락정도를 추정해야 한다. 본 연구에서는 1987년과 1988년 도시가계조사 테이프를 이용하여 소득(所得)-지출추계방법(支出推計方法)에 의해 탈루소득(脫漏所得)이 전체소득(全體所得)에서 차지하는 비중을 추정하였다. 그 결과 1987, 1988년 두 해의 탈루소득(脫漏所得)의 규모는 전체 GNP의 약 15%인 것으로 추정되었다. 다시 이렇게 추정된 탈루소득비율(脫漏所得比率)을 이용하여 소득세(所得稅)의 탈세규모(脫稅規模)를 추정하였으며, 그 규모가 전체소득세(全體所得稅)에서 차지하는 비중은 1987년에 10~11.3%, 1988년에는 8.7~9.8%에 달하는 것으로 추정된다. 한편 부가가치세(附加價値稅)의 과세표준인 민간소비지출(民間消費支出)의 탈루규모(脫漏規模)는 전체탈루소득(全體脫漏所得)과 거시민간소비함수(巨視民間消費函數)에 추정된 민간소비(民間消費)의 대(對)GNP탄력성을 이용하여 추정한 결과, 1987, 1988년 모두 10.5%인 것으로 추정되었다. 이에 따라 1987, 1988년의 부가가치세(附加價値稅)의 탈세규모(脫稅規模)는 10.5~16.5%에 달했던 것으로 추정된다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.9
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• pp.91-99
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• 2018

This research was conducted to examine successful aging and influencing factors in middle aged women. Data were collected from 189 middle-aged women in two cities. Data were collected from July to August 2017 using structured questionnaires. Data collected were analyzed by descriptive statistics, t-test, ANOVA, Pearson correlations, and multiple regression analysis. The results indicate that the perception of successful aging mean was 128.49 points (range: 33-165). Depression (r=-.20, p=.005) had a significant negative association with perception of successful aging. Family resilience (r=.49, p<.001) and life satisfaction (r=.54, p<.001) were positively correlated with perception of successful aging. The significant predictors of successful aging were age (${\ss}=-.15$, p=.013), family resilience (${\ss}=.24$, p=.002), and life satisfaction (${\ss}=.37$, p<.001), explaining 33.9% of the variance. Based on the study results, we suggest that it is necessary to develop and apply educational strategy to improve perception of successful aging.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.10
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• pp.403-411
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• 2016

Recently, the number of occurrences of inundation and the severity of flood damage has increased rapidly as the frequency of localized heavy rainfall and the ratio of impervious area increased in urban areas. Most local governments focus on employing structural measures (e.g., the construction of detention reservoirs/pump stations, rehabilitation of drainage and sewer pipes) to prevent urban inundation. On the other hand, the effectiveness of implementing such structural measures is being dimished because there are already many inundation prevention facilities. The limitation of structural measures can be overcoming by employing non-structure measures, such as flood alerts and the operation of drainage facilities. This study suggests the pump operation rule (i.e., suggesting pump stop level) for a new detention reservoir operating method, which triggers the operation of a pump based on the water level at the monitoring node in urban drainage system. In the new reservoir operation, a total of 48 rainfall events are generated by the Huff distribution for determining the proper pump stop level. First, the generated rainfall events are distributed as frequencies, quartiles, and durations. The averaged system resilience value was determined to range from 1.2 m to 1.5 m is based on the rainfall-runoff simulation with rainfall generated by the Huff distribution. In this range, 1.2 m was identified considering the safety factor of 1.25 by the Standard on sewer facilities in 2011.

• Journal of the Korean Regional Science Association
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• v.31 no.1
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• pp.65-81
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• 2015

The purpose of this study is to analyze the tourism demand elasticity of travel time distance on domestic destinations in Korea. Piecewise Linear Regression Model was applied to estimate the elasticities based on the Korea National Tourism Survey. It is found that the tourism demand elasticities by tourist distances decrease by 0.005% if time distance increase by 1 minute. In the first section, the most nearest distance is less than 11.6 minutes from the origin, elasticities increases by 0.206% of tourism demand, whereas in second section (from 11.7 to 75.1 minutes) and third section (more than 75.2 minutes) it decreases by 0.106% and 0.021%, respectively. The third section with sharply rising distance decay rate can be interpreted as the Effective Tourism Exclusion Zone of domestic tourists in Korea. Additionally, the more tourism demand is appeared at the younger age group than older age group, single travellers than group travellers, and people in Metropolitan Areas than in smaller cities.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.6
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• pp.563-573
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• 2020

This study aimed to provide basic data to assist in developing programs to improve the quality of life after identifying the factors affecting aging anxiety among middle-aged women. The subjects were 256 middle-aged women in Korea. Data were collected from March 8 to April 11, 2019, and analyzed using descriptive statistics, independent t-test, One-way ANOVA, Pearson correlation, and stepwise multiple regression with SPSS/WIN 18.0. This study found that the aging anxiety of the subjects differed significantly according to job and marriage satisfaction. Aging anxiety had a negative correlation with health perceived health (r=-.300, p<.001), resilience (r=-.537, p<.001), satisfaction of married life (r=-.316, p<.001), and self-esteem (r=-.424, p<.000). The factors affecting aging anxiety were as follows: resilience (β=-.47, p<.001), occupation (β=-.19, p=.003), and self-esteem (β=-.19, p=.014) with 36.9% explanatory power (F=14.34, p<.001). To reduce the aging anxiety of middle-aged people, programs will be needed to improve participation in post-middle-aged jobs or social activities and resilience, self-esteem, thereby providing education and mediation that can allow middle-aged women to accept aging positively.

• Korean Journal of Environment and Ecology
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• v.35 no.4
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• pp.387-397
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• 2021

This study aims to present reference data necessary for developing evaluation indicators to analyze the actual resilience of purchased land by investigating the factors that affect the restoration of the purchased land in the riparian zone and quantitatively calculating its importance. The main results are as follows. Firstly, this study identified 34 potential resilience factors through a literature review encompassing domestic and overseas studies and derived seven ecological responsiveness factors, six physical responsiveness factors, and four managerial responsiveness factors through the Delphi survey. Secondly, reliability analysis and Analytic Hierarchy Process (AHP) analysis derived the following important factors: structural stability of the vegetation restored in the purchased land, species diversity of wildlife, structural stability of wildlife, the size of restored wetland after purchase, number of plant species, and the land cover status adjacent to the purchased land. The study results are expected to be helpful information for ecological restoration and management plans reflecting reinforcing factors for resilience at each stage of land purchase, restoration, and management.

• Journal of the Korean Regional Science Association
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• v.33 no.3
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• pp.3-19
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• 2017

The purpose of this paper is to analyze the impacts of regional industrial diversity on regional business cycle response to national volatility. We employed mean group and pooled mean group estimators of panel vector error-correction models in order to control unobserved heterogeneity of the port cities, such as Pusan, Ulsan and Incheon. The results show that in various industrial regions, short-term fluctuations in the unemployment rate are small compared to other regions. On the contrary, long-term volatility of manufacturing production index is low in those regions.