• 산업경영시스템학회지
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• 제46권1호
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• pp.42-47
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• 2023

With rapid urbanization, the importance of urban warfare is increasing, and it is also required to reflect the characteristics of cities in wargame models. However, in the military's wargame models, the urbanization factor was calculated and used without theoretical basis. In this study, we investigate techniques for estimating the urbanization factor using Fractal dimension theory. The urbanization factor we propose can suggest a logical and valid representative value when used in conjunction with Agent Based Model and other methodologies.

• 한국항만경제학회지
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• 제38권3호
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• pp.1-13
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• 2022

부울경 메가시티는 동남권지역의 성장과 연계성을 강화하여 제2수도권으로 성장하는 것을 목표로 설정하였다. 이 목표를 달성하기 위해 4가지 공동체 구성을 정책수단으로 설정하고 있다. 본 연구는 부울경 경제공동체에 초점을 맞추어 항만물류와 지역경제발전 간의 연계성을 분석하기 위해 VAR 모형, Granger 인과관계분석, 충격반응함수, 분산분해 등의 연구방법을 사용하였다. 실증분석 결과는 다음과 같다. 첫째, 선박입출항은 화물수송량에 정(+)의 유의미한 영향을 미치는 것으로 나타났다. 분산분해 결과에 의하면 선박입출항은 화물수송량에 대하여 0.84%~9.94%의 영향을 주는 것으로 나타났다. 둘째, 화물수송량은 선박출입항과 경기종합지수에 대하여 선행적으로 영향을 미치는 것으로 나타났다. 분산분해 결과에 따르면 화물수송량은 선박입출항에 대하여 32.73%~36.48%, 경기종합지수에 대하여 0.07%~3.65%의 영향을 주는 것으로 나타났다. 경기종합지수는 화물수송량에 정(+)의 유의미한 영향을 미치는 것으로 나타났다. 충격반응분석과 분산분해 결과를 통해 경기종합지수가 선박입출항과 화물수송량에 약한 충격을 주고 있음을 확인할 수 있었다. 본 논문의 정책적 시사점은 다음과 같다. 첫째, 부울경 지역 정부는 해양항만 인프라 확충, 투자장려 등 해양경제 활성화를 위한 인센티브를 제공해야 한다. 둘째, 부울경 지역과 연계된 주요 국가 항만의 화물수송량 증가는 부울경 지역 경제에 대하여 정(+)의 영형을 미치기 때문에 부울경 메가시티 항만화물 증가를 위해 이들 국가 및 항만을 대상으로 적극적인 항만마케팅 및 정기항로 서비스를 확대해 나가야 한다. 셋째, 글로벌 선박사의 초대형 선박 및 크루즈가 부울경 메가시티 항만에 지속 기항할 수 있도록, 시설확충 등 해양항만 인프라 확대를 위한 투자가 지속적으로 이루어져야 한다.

• Asian Journal of Innovation and Policy
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• 제11권1호
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• pp.110-147
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• 2022

Many megacities are exposed to natural hazards such as earthquakes, and when located in coastal regions, are also vulnerable to hurricanes and tsunamis. The physical infrastructures of transportation systems in megacities have become so complicated that very few organizations can understand their response to extreme events such as earthquakes and can effectively mitigate subsequent economic downfalls. The technological advances made in recent years to support these complex systems have not grown as fast as the rapid demand on these systems burdened by population shift toward megacities. The objective of this paper is to examine the risks imposed on and recoveries of transportation systems in megacities as the result of extreme events such as an earthquake. First, the physical damage to transportation infrastructure, loss of the transportation system performance, and the corresponding economic loss from disruptions to passenger and freight traffic is evaluated. Then, traffic flows are re-routed to reduce vehicles' delay due to earthquakes using a microscopic traffic flow simulator with an optimization model and macroscopic terminal simulator. Finally, the economic impact of the earthquake is estimated nationwide. Southern California is regarded as the region of study. The results demonstrate the effectiveness of the integrated model and provide what and how to prepare innovative resilience policies of urban infrastructure for a natural disaster occurrence.

• 통합자연과학논문집
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• 제4권2호
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• pp.149-157
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• 2011

Urbanization of the world's population has given rise to more than 450 cities around the world with populations in excess of 1 million (megacity) and more than 25 so-called metacities with populations over 10 million (Brinkhoff, 2010). The United States today has a total resident population of more than 308,500,000 people, with 81 percent residing in cities and suburbs as of mid - 2005 (UN, 2008). Urban meteorology is the study of the physics, dynamics, and chemistry of the interactions of Earth's atmosphere and the urban built environment, and the provision of meteorological services to the populations and institutions of metropolitan areas. While the details of such services are dependent on the location and the synoptic climatology of each city, there are common themes, such as enhancing quality of life and responding to emergencies. Experience elsewhere (e.g., Shanghai, Helsinki, Tokyo, Seoul, etc.) shows urban meteorological support is a key part of an integrated or multi-hazard warning system that considers the full range of environmental challenges and provides a unified response from municipal leaders. Urban meteorology has come to require much more than observing and forecasting the weather of our cities and metropolitan areas. Forecast improvement as a function of more and better observations of various kinds and as a function of model resolution, larger ensembles, predicted probability distributions; Responses of emergency managers, government officials, and users to improved and probabilistic forecasts; Benefits of improved forecasts in reduction of loss of life, property damage, and other adverse effects. A national initiative to enhance urban meteorological services is a high-priority need for a wide variety of stakeholders, including the general, commerce and industry, and all levels of government. Some of the activities of such an initiative include: conducting basic research and development; prototyping and other activities to enable very--short and short range predictions; supporting and improving productivity and efficiency in commercial and industrial sectors; and urban planning for long term sustainability. In addition urban test-beds are an effective means for developing, testing, and fostering the necessary basic and applied meteorological and socioeconomic research, and transitioning research findings to operations. An extended, multi-year period of continuous effort, punctuated with intensive observing and forecasting periods, is envisioned.