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2017, Vol.26, No.4

  • 1.

    A Study on a Hybrid Energy System to Reduce CO2 Emission In Mavuva Island, Fiji

    Tae Yong Jung | 현정희 | 이슬 and 1other persons | 2017, 26(4) | pp.217~226 | number of Cited : 0
    Abstract PDF
    Although the effects of climate change are universal, Small Island Developing States (SIDS) are considered to be most vulnerable. SIDS heavily rely on imported oil and fossil fuels for electricity generation and transportation, which makes them economically vulnerable and exposed to fluctuating oil price. Among the reasons SIDS highly depend on diesel fuel is due to the dispersed population living in remote islands which means, providing electricity through on on-grid system is difficult. Fiji as one of the SIDS, has actively promoted renewable sourced energy through a national plan to mitigate the impacts of climate change. In order to determine how feasible implementing a renewable energy (RE) system will be in Fiji, this study chose a remote island called Mavuva Island to test application of a hybrid RE system using HOMER. A combination of energy storage system (ESS), solar photovoltaic (PV) and diesel generator turns out to be the most cost effective and optimal configuration, resulting in effective greenhouse gas reduction for the given region.
  • 2.

    Development and Feasibility of Indicators for Ecosystem Service Evaluation of Urban Park

    김은영 | 김지연 | 정혜진 and 1other persons | 2017, 26(4) | pp.227~241 | number of Cited : 6
    Abstract PDF
    A human in urban areas has depended on ecosystem for well-being, so it is important to evaluate urban ecosystem services which contribute significantly to human well-being. In this study we classified ecosystem functions and set indicators used for evaluating ecosystem services of urban park by Delphi method. As a result, it derived 12 items and 14 indicators of ecosystem services to evaluate them such as vegetable garden, canopy cover, biodiversity, and educational programs. Based on the derived evaluation indicators, the feasibility of the indicators was examined by applying to two urban parks, Maetan park and Seoho-Ggotme park, in Suwon City. We also suggested strategies to improve each ecosystem services based on the results of evaluation. It is significant to recognize unknown services in urban parks. The results can be used for improving urban ecosystem services consistently in response to current rapid urbanization. In the future, the city should make a master plan on ecosystem service on urban area, beyond urban park, considering both of quality and quantity.
  • 3.

    Dispersal of Hazardous Substance in a City Environment Based on Weather Conditions and Its Risk Assessment at the Pedestrian Level

    김은령 | Gwang-Jin Lee | Chaeyeon YI | 2017, 26(4) | pp.242~256 | number of Cited : 0
    Abstract PDF
    In this paper, dispersion scenarios concerning various meteorological conditions and real urban structures were made to estimate the impacts of hazardous substance leakage accidents and to reduce damages. Based on the scenario of the hazardous substance dispersion, the characteristics of the risk in the pedestrian environment were analyzed in Gangnam, Seoul. The scenarios are composed of 48 cases according to the meteorological conditions of wind direction and wind speed. In order to analyze the dispersion characteristics of the hazardous substances, simulations were conducted using a computational fluid dynamic (CFD) model with hydrogen fluoride releases. The validation for the simulated wind was conducted at a specific period, and all the calculated verification indices were within the valid range. As a result of simulated dispersion field at pedestrian level, it was found that the dispersion pattern was influenced by the flow, which was affected by the artificial obstacles. Also, in the case of the weakest wind speed of the inflow, the dispersion of the hazardous substance appeared in the direction of the windward side at the pedestrian level due to the reverse flow occurred at lower layers. Through this study, it can be seen that the artificial structures forming the city have a major impact on the flow formed in urban areas. The proposed approach can be used to simulate the dispersion of the hazardous substances and to assess the risk to pedestrians in the industrial complexes dealing with actual hazardous substances in the future.
  • 4.

    A Study on Deveolpment of Management System on Soil Moving

    Keunje Yoo | 윤성지 | Jong Sung Kim and 1other persons | 2017, 26(4) | pp.257~271 | number of Cited : 0
    Abstract PDF
    In Korea, soil is being transported in and taken out for the purpose of national land development, but the soil is being moved without consideration of soil contamination. Therefore, this is a policy-focused study of the management system on soil moving. In this study, we analyzed current state of domestic and foreign management and suggested three alternatives for management of soil moving in 1) self-regulation, 2) obligatory regulation, 3) phase-in according to types of regulation. In order to establish a clear and reasonable management system for soil movement in the future, it is necessary to improve the legal and institutional limitations of the current soil environmental law as suggested by this study.
  • 5.

    Island-Biogeographical Characteristics of Naturalized Plant in Jeollanamdo Islands

    Hyun-Hee Kim | Kim Dabin | 전철현 and 2other persons | 2017, 26(4) | pp.272~289 | number of Cited : 7
    Abstract PDF
    This study analyzed the status of the naturalized plants in islands in Jeollanamdo from an island biogeographic perspective. As a result of a floristic analysis at 47 inhabited islands and 194 uninhabited islands, 30 families and 134 species naturalized plants are reported. The most commonly occurring naturalized plant from 141 islands was Rumex crispus. The average number of naturalized plants by islands is 20.6 species (±14.22) at the inhabited islands and 3.7 species (±3.89) at the uninhabited islands. Presence of fifty nine naturalized species at Geumodo in Yeosu-si is the largest in number. The naturalization ratio, which is the ratio of naturalized plants to native plants, is 7.66% (±3.96) in the inhabitable islands and 4.97% (±3.70) in the uninhabitable islands. The naturalization ratio among islands of the West Sea in Jeollanam-do is 5.92% (±4.49), and it is higher than 4.96% (±2.15) in islands in the South Sea. Especially, the naturalization ratio at the inhabitable islands, i.e., 8.39% (±4.37) at the islands of the West Sea is higher than 5.80% (±1.41) at islands in the South Sea. The naturalization ratio of naturalized plants at the islands shows positive correlation with the size of the island (r=0.412, p<0.01), but the correlations with distance from the mainland and altitude above sea level are not significant. Eight ecosystem disturbing species designated by law are reported, and each species shows distinct distributional ranges. The regional differences in the number of naturalized plant species seem to be a result of the complex reflection of natural and human environmental factors, such as the degree of traffic between mainland and islands, degree of cultivation activities, along with the physical environmental differences. Since islands have limited habitats and resources, islands could be more vulnerable to the incoming species from outside, and environmental changes than mainland. Therefore, continuous monitoring and management against the naturalized plants in islands are needed.