• Journal of Digital Convergence
• /
• v.19 no.5
• /
• pp.93-103
• /
• 2021

The special means of transportation introduced to improve the mobility of the transportation vulnerable met the number of legal standards in 2016, but lack of development in terms of quality, such as the existence of long waiting times. In order to streamline the operation of special means of transportation, long-term standby traffic, which is the top 25% of the wait time, was extracted from the Daegu Metropolitan Government's special transportation history data, and spatial autocorrelation analysis and social network analysis were conducted. As a result of the analysis, the correlation between the average waiting time of special transportation users and the space was high. As a result of the analysis of internal degree centrality, the peak time zone is mainly visited by general hospitals, while the off-peak time zone shows high long-term waiting demand for visits by lawmakers. The analysis of external degree centrality showed that residential-based traffic demand was high in both peak and off-peak hours. The results of this study are considered to contribute to the improvement of the quality of the operation of special transportation means, and the academic implications and limitations of the study are also presented.

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2003.11a
• /
• pp.187-188
• /
• 2003

세계는 전체 에너지 수요의 약 80%를 화석연료에 의존하고 있으며 화석연료중 약 50%는 석탄에 의존하고 있다. 국내의 경우에도 전체 전력 생산의 약 30% 정도는 계속 석탄으로 유지될 전망이다. 환경문제가 21세기의 중요한 테마로 부상하면서 화석연료 사용에 의한 유해 대기오염물질의 배출이 문제가 되고 있으며 그 규제는 점차 강화되어 최근에는 SO$_2$와 NOx에 강화된 규제가 적용되고 있고 $CO_2$의 규제도 구체화되고 있다. (중략)

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2002.11a
• /
• pp.284-285
• /
• 2002

입자상 오염물에 대한 대기 환경기준이 인체에 미치는 영향과 관련하여 총부유분진에서 PM10(10 미크론 이하의 입자) 및 PM2.5(2.5 미크론 이하 입자)의 미세입자 농도 범위로 변화되고 있다. 따라서 이들 미세입자 농도를 측정할 수 있는 정밀 측정법의 개발이 요구되고 있고 이들 측정기의 수요도 늘어갈 전망이다. (중략)

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.33 no.3
• /
• pp.1087-1094
• /
• 2013

This study aims at enhancing the objective estimation of social cost of air quality due to mobile emission. More specifically, it examines the difference between the daily oriented and hourly oriented estimation results of social air quality cost and draws implications from the comparative analysis. The result indicates that the social cost of air quality differs up to approximately 24 times depending on the analysis time period. Moneywise, the difference between daily and hourly assignments amounts to the average of 653.5 billion won whereas only 1% of error occurred in the estimation result based on peak and nonpeak based hourly assignment. This study reaffirms the need for time-based travel demand management for emission reduction, and confirms the feasibility of emission estimation by travel demand forecasting method over the conventional method employed by the CAPSS.

• Environmental and Resource Economics Review
• /
• v.29 no.4
• /
• pp.499-520
• /
• 2020

Input ratio of electricity to other production inputs in the Korean manufacturing sector has been higher than for the other OECD countries. In addition, electricity prices in Korea has been relatively lower than the average of OECD countries. Moreover, electricity sector is responsible for most CO2 emissions in Korea as coal and natural gas account 41.9% and 26.8% of electricity production as of 2018. Therefore, it looks inevitable to raise the electricity tariff for the manufacturing sector in Korea, but there is a concern that increase in the electricity tariff might affect small and medium enterprises (SMEs) more than large firms. This study estimates electricity demand's price and output elasticities for large firms and SMEs in steel industry by employing a time varying parameter model (Kalman filter). The analysis shows that changes in output levels regardless of firms' size affect electricity demands more significantly than do changes in electricity prices. Second, large firms have higher variances for both price and output elasticities of electricity demand. Third, large firms have higher price elasticity but lower output elasticity of electricity demand relative to SMEs. Policy implications are suggested in association with how to reduce electricity demands in the energy-intensive industry.

• Environmental and Resource Economics Review
• /
• v.17 no.2
• /
• pp.287-311
• /
• 2008

This paper is designed to examine how the global timber market impacted by climate change would affect global warming through the carbon flux of forests. For this purpose, we integrated the modified TSM 2000 and the extended TCM in order to simulate the projection of net carbon release of forests from 1995 to 2085. On the basis of the simulation results under normal demand growth scenario, we identified that the global timber market impacted by climate change ameliorates the atmospheric carbon about 3.60% of carbon dioxide concentration in 1990 over 90 years. This implies that the global timber market impacted by climate change has a negative feedback effect on global warming over 90 years. For sensitivity analysis, we performed these simulation procedure under high demand growth scenario and very high demand growth scenario.

• Journal of Korean Society of Transportation
• /
• v.21 no.5
• /
• pp.19-29
• /
• 2003

The purpose of this study is to analyse the effect of the parking information on the waiting time using the simulation method. Stated Preference survey has been implemented to construct the parking lot choice model. A queue simulation is carried out to investigate the effect of various parking information on the waiting time. The results show that providing parking information is likely to increase the utilization of parking place and to decease the waiting time of individual vehicle. Furthermore, as the parking demand increases, the detailed and quantitative parking information such as "5 minutes delay" is more effective than qualitative parking information such as "available".

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2003.05b
• /
• pp.157-158
• /
• 2003

급증하는 자동차 수요로 인해 발생되는 배출량 증가는 자동차 운행의 특성상 대도시 대기오염의 주원인으로 작용하고 있다. 자동차 배출오염물질의 배출량 추정 및 관리에 있어 연간 배출량 뿐만 아니라 월별 기온변화에 따른 배출량의 시간분포 또한 고려되어야 한다. 본 연구에서는 Hot emission에 부가되는 Cold start emission과 Evaporative VOC emission의 산정에 있어서 차종/차령에 대해서 월별 배출량을 추정하여 보았다. (중략)

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2000.11a
• /
• pp.143-144
• /
• 2000

급증하는 자동차 수요로 인해 발생되는 배출량 증가는 자동차 운행의 특성상 대도시 대기오염의 주원인으로 작용하고 있다. 자동차 배출오염물질의 배출량 추정에 있어 국내 차량의 배출계수 개발도 시급하지만 우리 나라 자동차 운행패턴에 관한 연구도 같이 병행되어야 한다. 본 연구에서는 Cold start emission과 Evaporative VOC emission의 산정에 있어서 국내 승용차의 1회 주행거리(Trip length)를 이용하여 승용차 부문 배출량 영향정도와 계절별 배출량 변화를 추정하여 보았다. (중략)

• Proceedings of the Korea Information Processing Society Conference
• /
• 2017.11a
• /
• pp.415-417
• /
• 2017

국내의 도시화와 중국에서 넘어오는 오염물질에 의하여 대기오염에 대한 피해가 갈수록 커져가고 있다. 하지만 대기오염 집중측정소 6곳에서만 초미세먼지의 구성 성분을 실시간으로 측정하고 있고 그에 대한 자료를 공개하지 않는 것으로 알려져 있다 [1]. 또한 정부는 서비스 개발 및 제공 과정에서 공공성에 대한 고려도 중요하지만, 그것이 얼마나 시민들의 수요나 관심과 결부되어 있는지에 대한 고민도 함께 요구된다. 특히 서울특별시와 같이 대도시에서 거주하는 시민들의 주된 관심사 중 대기오염과 관련한 관심은 지속적으로 높아지고 있다 [2]. 본 논문은 6가지의 센서가 내장된 LED 조형물을 실생활 공간에 배치하고 조형물, 모바일, 웹에서 정보를 실시간으로 제공하는 대기오염 정보 제공 시스템을 제안할 것이다. 일반 대기 측정소와 다른 LED 조형물을 통하여 시민들의 접근성과 편리함을 향상시킬 수 있는 새로운 방식의 대기오염 정보 제공 시스템을 기대해볼 수 있을 것으로 예상된다.