• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.1292-1295
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• 2012

인구 과밀화 및 급격한 도시 팽창은 지상공간에서 거주하는 인간 삶의 질을 위협하고 있다. 따라서 지상공간의 개발을 억제하여 환경을 보호하고 도시 공간 이용의 효율성을 최대화하기 위해 지하 공간을 개발하고자 하는 움직임이 활발하다. 자연환경으로부터 격리된 구조인 지하공간은 지상공간에 비해 실내 공기 질을 쾌적한 상태로 유지하기 어려운 밀폐된 환경이므로 오랜 시간동안 상주하는 거주자 및 한시적 이용자들의 건강에 영향을 미치는 온도, 습도, $CO_2$, 먼지 등의 환경을 제어하기 위한 기술 개발이 필요하다. 본 연구에서는 지하공간의 쾌적도 향상을 위해 온 습도 및 $CO_2$, 먼지센서를 이용한 통합 센서를 제작하여 현재 지하공간의 환경정보를 실시간 모니터링하고 실내공간의 쾌적 지표를 기반으로 환풍기, 송풍기 등의 디바이스를 제어하기 위한 USN 기반의 환경제어시스템을 구현한다. 제안한 시스템을 통해 지하공간의 환경을 개선할 뿐만 아니라 고가의 계측 장비로 인한 비용 절감 및 이동성과 확장성 등의 부가적인 효과를 기대한다.

• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.202-202
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• 2017

전 세계적으로 기후변화로 인해 슈퍼태풍 및 극한 강우, 폭설과 한파, 온난화 현상이 발생하고 있으며, 한반도의 기후변화는 전 세계 평균보다도 빠르게 진행되고 있다. 특히 북한지역은 오랜 식량난과 에너지난으로 산림생태계가 훼손되어 홍수 및 이수와 같은 기후변화 관련 자연재해에 매우 취약하며, 무분별한 도시화에 따른 불투수층의 증가로 인해 유역내의 수문순환요소가 변화하고 있다. 이러한 기후변화에 효율적으로 대처하기 위해서는 체계적이고 과학적인 기상 및 기후정보의 활용이 중요하다. 하지만 본 논문의 대상지역인 북한지역은 우리가 수문자료를 구하기가 힘들고, 직접 측정 할 수 없기 때문에 수문순환분석에 한계가 있다. 따라서 본 논문에서는 WMO에서 제공하고 있는 북한의 27개 기상관측소의 강수량, 기온자료를 제공 받아 분석에 사용하였다. 본 논문에서는 기상정보를 이용하여 각 관측소별 잠재 증발산량을 산정하였으며, 또한 lumped conceptual model 인 WASMOD 모형을 이용하여 북한 미계측 유역의 유출량을 산정 하였다. 이렇게 산정된 수문순환요소 시계열 자료를 이용하여 통계분석, BCP, 유황분석등 시계열 분석을 통해 북한지역의 수문순환특성을 파악하고자 한다.

• Proceedings of the Korea Water Resources Association Conference
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• 2023.05a
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• pp.387-387
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• 2023

2022년 중부권 폭우로 인하여 서울 강남구에서 도시홍수가 발생하였고, 많은 인명 및 경제적 지해를 유발하였다. 기후변화로 야기되는 극한 강우의 발생 패턴 및 강우 패턴의 변화가 많은 연구에서 확인되어 오고 있다. 한국의 경우 극한 강우가 국지적이고 단기간에 많은 강우량을 발생시키는 패턴으로 변화하고 있는 것으로 연구되고 있다. 특히, 도시홍수의 경우 도달시간이 매주 짧기 때문에, 초단기간에 대한 강우분석이 필요하나, 강우관측시스템의 한계로 인하여 현재까지는 초단기간에 대한 극한 강우분석이 미비한 실정이다. 1997년 이후로 기상청에서는 지속적으로 방재기상관측망(Automatic Weather System, AWS)를 설치를 하였고, 최근에 설치된 AWS의 경우 초단기간 강우량 자료를 관측할 수 있는 장비 및 시스템을 구축하고 있으나, 운영된 기간이 짧아 빈도해석에 적용하기에 한계점이 많다. 본 연구에서는 서울 지역에서 영향을 주는 40여개의 AWS의 초단기간 강우량 자료를 이용하여 서울 지역을 확률강우량을 산정하고자 한다. 짧은 관측기간으로부터 발생하는 확률강우량 추정불확실성의 저감을 위해서 지역빈도해석을 적용하였다. 지역빈도해석으로는 지수홍수법을 적용하였다. 추가적으로 서울안에서 공간적으로 확률강우량의 편차에 대하여 조사 분석하였다. 본 연구의 결과를 통하여 서울지역의 초단기간에 대한 안정적인 확률강우량의 추정이 가능할 것으로 예상되며, 추가적으로 지역별 확률강우량의 차이를 비교분석 할 수 있을 것으로 기대된다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.5
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• pp.118-127
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• 2021

Recently, the public's interest in the air environment has increased, and public health is threatened by fine particulate matter. Furthermore, the government continues efforts to improve air quality by expanding the monitoring of air pollutants and reinforcing environmental standards. Since air quality differs depending on the region in the Korean Peninsula, it is currently necessary to identify the cause and search for influencing factors. In this study, the atmospheric environment and regional differences in cities located in the Chungnam Province were observed. As a research method, regression analysis was performed for weather conditions, such as temperature, wind speed, precipitation, and season and targeted at air pollutants, such as SO₂, NO₂, CO, O₃, PM₁₀, and PM_2.5, as well as heavy metals contained in particulate matter, such as Pb, Cd, Cr, Cu, Ni, As, Mn, Fe, Al, Ca, and Mg. In the case of PM₁₀, the concentrations of Mn(0.4884) in Cheonan, CO(0.3329) in Dangjin, and Mg(0.5691) in Seosan were highest. In the case of PM_2.5, Cheonan NO₂(0.4759), Dangjin CO(0.4128), and Seosan NO₂(0.3715) were significantly affected. In summary, the influencing factors vary according to the region in Chungnam province in terms of air quality, and there is a difference in the degree of contribution. Therefore, it is considered that the Korean government's management of air quality is required for each region.

• Journal of the Korean Regional Science Association
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• v.35 no.2
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• pp.73-86
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• 2019

The purpose of this paper is to empirically analyze the effects of related and unrelated varieties of industry and occupation on regional economic growth. Recent studies dealing with the mechanism of economic growth argue that occupation as well as industry act as the driving force of regional economic growth by inducing knowledge externalities. Therefore, this study comprehensively analyzed the effects of occupational diversity along with industrial diversity. For the empirical analysis, we set the regional labor market areas as the spatial units of analysis. Dependent variables include regional per capita GRDP and employment growth between 2010 and 2015, and related and unrelated variety of industry and occupations measured based on the entropy approach are used as key explanatory variables. Our empirical results show that the related variety of industry has a positive effect on per capita GRDP in the region, and the related variety of occupation has a positive effect on regional employment growth. On the other hand, the unrelated variety of industries shows a negative correlation with regional employment growth. Based on the empirical results, this paper provides regional policy implications for strengthening economic vitality by dividing the diversity of industry and occupation into related and unrelated varieties and analyzing how they affect regional economic growth.

• The Journal of the Korea Contents Association
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• v.10 no.2
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• pp.330-341
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• 2010

The purpose of this study is to have comparative analysis on the differences between metropolis and provincial city's electronic security system users' security needs satisfaction and life satisfaction. This study sampled total 400 users with using purposeful sampling after selecting specific metropolis and provincial cities as population. It was conducted on 4 realms-bank, jewelry store, convenience store and communication industry- with two times. First one was on June, 2008, it was conducted in Seoul, 5 areas divided based on Hangang, which are Gang-dong, Gang-seo, Gang-nam, Gang-buk, and civic center. We sampled 40 electronic security system users of each area which are 200 in sum. Second one was on January, 2009, with users in Cheonan and Asan, 200 was sampled in the same way with metropolis; 100 users of each city. The reliability of the questionnaire showed Cronbach's ${\alpha}$ value over .812. The results are as follows. First, there showed difference on physical security needs satisfaction of electronic security system users with the size of city. In other word, users in metropolis have higher environmental, psychological, and informational security needs satisfaction than users in provincial city. Second, there is also difference in life satisfaction. Namely, users in metropolis have higher security needs satisfaction than users in provincial city. Third, security needs satisfaction of electronic security system users by city size effects life satisfaction. That is, in case of users in metropolis, the more physical, environmental, and informational security needs satisfaction it shows, the more life satisfaction it showed.

• Journal of the Korean Geographical Society
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• v.49 no.4
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• pp.525-545
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• 2014

This study seeks to clarify the influence of the stage migration which has proceeded through generations, on the population growth of local cities in the case of Jeollabuk-do. For this, setting to baby boomer as parents generation and echo boomer as their children, this study traces each generation's birth, distribution and the process of selective migration using aggregate level data. And the stage migration is analyzed by O-D, divided into three regions in each; Jeollabuk-do rural areas, Jeollabuk-do cities and other provinces. The major findings of this study are as follows. First, it was estimated that the number of the baby boomer births in Jeollabuk-do rural areas was seven times more numerous than in cities. Second, both rural and urban born baby boomers overwhelmingly moved into other provinces, especially Seoul metropolitan area and metropolis in their selective migration processes. However, there was also migration stream from rural areas to cities in Jeollabuk-do and the amount of this stream was approximately equal to the amount of outflux from cities in Jeollabuk-do to other provinces. Third, due to baby boomers' stage migration, from rural to urban, echo boomers were born in cities more than in rural areas. Fourth, urban born echo boomers still have moved into other provinces just like their parents generation in selective migration process. But comparing with baby boomer, the number of echo boomers influx from rural areas to cities has decreased. Consequentially the population of echo boomer in Jeollabuk-do cities also has decreased. Finally, the stage migration has been a basic cause of the social growth of urban population, and also influenced on the natural growth, closely connected with migrants' life course, such as marriage, childbirth and rearing. Therefore, this study concludes that the stage migration through generations is one of the crucial factor to understand the population growth in local cities.

• Korean Journal of Environment and Ecology
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• v.34 no.5
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• pp.466-482
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• 2020

This study used 3D computational fluid dynamics (CFD) in the ENVI-met program to investigate how particulate matters (PM) generated on roads disperse through adjacent urban neighborhoods according to the urban development pattern. An urban area centered on a six-lane road in the vicinity of Miryang City Hall in Gyeongnam Province was selected to simulate the effect of the green space and building height on the PM concentration. The ENVI-met model considered the presence of green space and different building heights (high/low) on both sides of the road to examine the dispersion of PM. The result showed that the area of high-rise buildings and green space had the lowest PM concentration dispersed to the adjacent area, followed by the area of high-rise buildings and no green space. In contrast, the PM concentration remained relatively high for low-rise buildings, regardless of the green space. The reason for the low PM concentration in the area with high-rise buildings was a strong building wind, which caused PM to disperse to the outside, lowering the PM concentration quickly. These results indicate that the PM can disperse faster, and the PM concentration remains low in the urban neighborhood. On the other hand, green space had no significant effect on reducing PM in the urban neighborhood. In particular, when there are low-rise buildings on both sides of the road, the green space has no effect on the PM concentration in the urban neighborhood. Since this study considered only the case of PM emitted from the road, future studies should investigate other factors to figure out the dispersion model of PM and conduct on-site experiments.

• 재활복지
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• v.18 no.4
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• pp.75-93
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• 2014

This study attempted to verify the impacts of the level of satisfaction in the user of alternative materials among people with visual impairment on their social participation, and the mediation effect of self-efficacy during such process. The subject of the study was the visually impaired who were live in Gyeonggi Province and were registered in the Korea Blind Union. The data of final 120 participants through a telephone survey were analyzed. The subject of the study used the recorded materials the most for the purpose of leisure and information research mainly at the braille library. The analysis of the mediation effect demonstrated that the level of satisfaction in the user of alternative materials among people with visual impairment had a statistically significant influence on social participation, and self-efficacy had a full mediation effect. These results imply the importance of alternative materials to assure the right to information access which can ultimately expand the social engagement of the visually impaired. Based on these study results, political suggestions are proposed to vitalize alternative materials in the future.

• Journal of Korean Society of Transportation
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• v.23 no.2
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• pp.25-36
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• 2005

In this study, we suggested a new approach method forecasting distribution demand of urban rail transit usign fuzzy control, with intend to reflect irregularity and various functional relationship between trip length and distribution demand. To establish fuzzy control model and test this model, the actual trip volume(production, attraction and distribution volume) and trip length (space distance between a departure and arrival station) of Daegu subway line 1 were used. Firstly, usign these data we established a fuzzy control model, nd the estimation accuracy of the model was examined and compared with that of generalized gravity model. The results showed that the fuzzy control model was superior to gravity model in accuracy of estimation. Therefore, wwe found that fuzzy control was able to be applied as a effective method to predict the distribution demand of urban rail transit. Finally, to increase the estimation precision of the model, we expect studies that define membership functions and set up fuzzy rules organized with neural networks.