• 한국환경복원기술학회지
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• 제20권4호
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• pp.43-61
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• 2017

The wetlands are facing environmental changes such as desiccation that occurs with the passage of time and reduced ecosystem services from wetlands in the city. In order to maintain the ecosystem services provided by wetlands in urban areas, a system thinking about the trade-off phenomenon of ecosystem services occurring as the wetlands undergo environmental changes is needed. Therefore, the purpose of this study is to develop strategies for wetland design using system thinking approach to enhance the resilience of ecosystem services degraded by the desiccation of wetlands and other disturbances. The objectives of this study include the system boundary and variables. Second, analyzing the dynamics of wetland design strategy. Third, it analyzes the trade-off phenomenon of ecosystem services in terms of the hydrology, hydric soil, and plants strategies to mitigate these effects. Fourth, wetland basic design to improve the resilience of ecosystem services. A wetland in Abuk-Mountain Neighborhood Park, Miryang-si, Gyeongsangnam-do, has been selected as a case study. Causal loop diagrams(CLDs) are used to analyze feedback in the wetland regime. In summary, hydrology, hydric soil, and plants is suggested as system boundaries to design plan. Design strategies for the wetland focused on robustness, redundancy, rapidity, and resourcefulness as a result of CLD analysis are first proposed in order to effectively maintain the wetland regime over the long term. Secondly, in a section related to hydrology, the CLD results show the trade-offs between provisioning-cultural services and regulating services. In order to control these services, a "water cycling system" has been implemented due to its strength in terms of robustness. The CLDs for hydric soil showed the trade-offs between regulating services and supporting services. An "installation of storm drainage for maintaining water levels" was selected due to the strength offered in terms of redundancy and rapidity. The CLDs for plants showed the trade-offs between provisioning - cultural services and regulating services. In order to control the strategic points, the "planting of indigenous vegetation" was suggested given the strength in terms of redundancy. In this study, a wetland design method is proposed that can improve the resilience of wetland ecosystem services by analyzing the dynamics overtime. The results of this research can theoretically be applied to help restore ecosystem services in wetlands using ecological landscape design. In addition, this study will contribute to reducing maintenance costs by improving wetland resilience.

• 국제학술발표논문집
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• The 8th International Conference on Construction Engineering and Project Management
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• pp.303-312
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• 2020

Safety culture is a collection of the beliefs, perceptions and values that employees share in relation to risks within an organisation. On the other hand, a resilient safety culture (RSC) means a culture with readiness of the organisation to respond effectively under stress, bounce back from shocks and continuously learn from them. RSC helps organisations to protect their interest which can be attributed to behavioural, psychological and managerial capabilities of the organization. Quantification of the degree of resilience in an organisation's safety culture can provide insights about the strong and weak links of the organisation's overall health and safety situation by identifying potential causes of system or sub-system failure. One of the major challenges of quantification of RSC is that the attributes that determine RSC need to be measured through constructs and indicators which are complex and often interrelated. In this paper, we address this challenge by applying a fault tree analysis (FTA) technique which can help analyse complex and interrelated constructs and indicators. The fault tree model of RSC is used to evaluate resilience levels of two organisations with remote and urban locations in order to demonstrate the failure path of the weak links in the RSC model.

• 한국도로학회논문집
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• 제20권1호
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• pp.35-45
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• 2018

PURPOSES : This study examines the performance changes of road networks according to the strength of a disaster, and proposes a method for estimating the quantitative resilience according to the road-network performance changes and damage scale. This study also selected high-influence road sections, according to disasters targeting the road network, and aimed to analyze their hazard resilience from the network aspect through a scenario analysis of the damage recovery after a disaster occurred. METHODS : The analysis was conducted targeting Sejong City in South Korea. The disaster situation was set up using the TransCAD and VISSIM traffic-simulation software. First, the study analyzed how road-network damage changed the user's travel pattern and travel time, and how it affected the complete network. Secondly, the functional aspects of the road networks were analyzed using quantitative resilience. Finally, based on the road-network performance change and resilience, priority-management road sections were selected. RESULTS : According to the analysis results, when a road section has relatively low connectivity and low traffic, its effect on the complete network is insignificant. Moreover, certain road sections with relatively high importance can suffer a performance loss from major damage, for e.g., sections where bridges, tunnels, or underground roads are located, roads where no bypasses exist or they exist far from the concerned road, including entrances and exits to suburban areas. Relatively important roads have the potential to significantly degrade the network performance when a disaster occurs. Because of the high risk of delays or isolation, they may lead to secondary damage. Thus, it is necessary to manage the roads to maintain their performance. CONCLUSIONS : As a baseline study to establish measures for traffic prevention, this study considered the performance of a road network, selected high-influence road sections within the road network, and analyzed the quantitative resilience of the road network according to scenarios. The road users' passage-pattern changes were analyzed through simulation analysis using the User Equilibrium model. Based on the analysis results, the resilience in each scenario was examined and compared. Sections where a road's performance loss had a significant influence on the network were targeted. The study results were judged to become basic research data for establishing response plans to restore the original functions and performance of the destroyed and damage road networks, and for selecting maintenance priorities.

• Asian Journal for Public Opinion Research
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• 제5권2호
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• pp.104-126
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• 2018

As the second most populous province in Cambodia, Battambang also exhibits an increasing number of urban poor areas. This research focuses on the economic situation of slum areas in Battambang and how people in slum areas are affected by climate change. This research report describes socioeconomics of people living in slum areas in 4 villages in Battambang City. An investigation will be made on motivation of moving to slum areas, access to water, access to sanitation, access to electricity, transport and delivery, access to health care, access to education, security of tenure, cost of living in slum, literacy, and access to finance. We also explore the policy of the public sector toward climate change in Cambodia.

• 한국조경학회지
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• 제51권5호
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• pp.30-43
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• 2023

그린인프라는 지속가능한 커뮤니티를 조성하는 데에 주요한 전략으로 고려되고 있다. 하지만 도시 레질리언스와 시스템의 역동성이라는 관점에서 그린인프라에 관한 연구는 아직 부족하며 이를 어떻게 물리적인 적용과 융합하는가에 관한 연구 역시 미미하다. 본 연구는 두 가지의 원인에 주목한다. 첫째는 정적변수를 고려하는 기존의 그린인프라 계획과 동적변수를 고려하는 도시모델링 연구 사이의 간극이며, 둘째는 도시모델링 연구와 조경설계 간의 정보 및 방법의 차이이다. 본 연구는 도시성장에 따른 그린인프라의 수요의 분포를 전망하며 설계의사결정을 지원하는 융합모델링을 제안한다. LEAM모델과 MCDA모델을 융합하여 그린인프라의 서비스와 사회경제적 도시변화의 관계성을 평가하고, 2050년의 그린인프라의 수요를 공간적으로 전망한다. 모델의 결과는 시카고 외곽에서의 도시화가 진행될수록 생태시스템 서비스의 질적 저하가 일어날 가능성이 있음을 말한다. 이는 경제성장에 의해 그린인프라에 대한 수요가 지리적으로 변화할 수 있음을 나타내며, 그린인프라 전략이 현재와 미래를 유동적이자 포괄적으로 고려해야 함을 제안한다. 나아가 본 연구는 스튜디오 환경에서의 생산된 정보를 학생들과 공유하여 근거기반 설계의 적용과 가능성에 관해 논의한다. 지오디자인의 관점에서 그린인프라 설계 및 계획과 도시시스템 연구의 융합을 통해 효율적인 설계의사결정을 지원함으로써 보다 탄력적인 도시환경을 조성하는데 기여하고자 한다.

• Weed & Turfgrass Science
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• 제4권4호
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• pp.338-347
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• 2015

Reinforcement cells are used to aid grass growth and taken together, this serves to extend greenery beyond the conventional spaces of lawns, tree pits, gardens, and parks, and is advantageous to urban cities since space for greening is often limited. Drought has variable effects on plant life and the resilience of turf to drought resistance also varies with species. Changes in photosynthetic ability were more pronounced for media rather than grass species. The media of sand without organic matter was found to be least suited for drought resistance. Normalized difference vegetation index (NDVI) and digital image analysis (DIA) data were generally in favour of Zoysia species as oppose to A. compressus. In A. compressus, selective traits such as, a more extensive root system and lower specific leaf area (SLA) were not an underlying factor that assisted this grass with enhanced drought resistance. Generally, WUE was found to be strongly related to plant characterises such as overall biomass, photosynthetic features as well as the lushness indexes, and specific leaf area. This study found a strong relationship between WUE and a suite of plant characteristics. These traits should serve as useful selection criteria for species with the ability to resist water stress.

• 한국기후변화학회지
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• 제5권3호
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• pp.257-266
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• 2014

This study aims to understand abnormal climate caused by impacts of climate change and to suggest the direction of urban planning focusing on adaptation to climate change. The study consists of theory consideration and case study(Chicago, Philadelphia, Seattle). As a result, the main impacts of climate change faced by urban areas are heat wave, precipitation, and drought. To prevent these impacts, it is important to prepare methods of urban planning as followings: planning for land use, park and green considering the climate patterns, establishing and managing water resources systems similar to the nature, securing renewable energy resources, and transportation facilities and exterior space with proof against climate. It is especially necessary to introduce infrastructures related to storm water, green roof, shading tree planting, green space, and permeable pavement. Finally, in order to realize urban planning for adaptation to climate change, it is needed to make the detailed and specific goal and strategy for the climate change adaptation plan and to extend the scope from the goals to an action plan, a detailed plan, and a design guideline.

• 문화기술의 융합
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• 제9권6호
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• pp.1057-1063
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• 2023

본 연구대상인 도시철도 침목플로팅궤도(STEDEF)는 구조물로 전달되는 진동을 저감시키기 위한 방진궤도이다. 현재 침목플로팅궤도의 침목방진패드 교체주기(정적 스프링강성 변화율, 25±2%)는 하중기반(궤도충격계수와 궤도지지강성)으로 설정되어 운영중인 실정이다. 그러나 대부분의 선행연구는 침목방진패드의 피로수명평가와 스프링강성 증가에 따른 궤도충격계수 및 궤도지지강성의 증가 등 하중기반의 구조적 안전성 측면의 연구가 진행되었다. 따라서 본 연구에서는 분석 구간별 도상 진동가속도를 측정하고 700만회 피로시험결과를 이용하여 구간별 침목방진패드 스프링강성을 산출하고자 한다. 구간별 산출한 침목방진패드 스프링강성을 해석제원으로 설정하여 도상 진동가속도를 해석적으로 도출하였다. 구간별 해석 도상 진동가속도가 현장측정 도상 진동가속도 범위 이내로 나타나 해석모델링의 적정성이 검증되었다. 도출된 스프링강성 변화에 따른 진동가속도 선도(g-k curve)를 이용하여 측정 도상 진동가속도로 침목방진패드 스프링강성을 추정하고자 한다. 따라서 측정 도상 진동가속도를 이용한 운행선로의 침목방진패드 스프링강성을 추정할 수 있는 기법을 제시하고자 한다.

• 문화기술의 융합
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• 제8권6호
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• pp.667-674
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• 2022

침목플로팅궤도(STEDEF)의 콘크리트침목은 2개의 콘크리트블럭을 타이바로 연결하여 구성된 형태이며 침목방진패드 및 침목상자와 도상 콘크리트층에 매립되어 레일로 전달되는 열차하중을 지지하고 하중을 도상으로 분산시키는 역할을 수행하는 주요 궤도구성품이다. 침목방진패드는 열차의 반복운행에 따른 누적하중 증가, 장기간 사용에 따른 열화로 인해 재료적 성능이 저하되어 다른 궤도구성품의 손상을 유발할 수 있다. 실제 형상과 동일한 3D 모델링으로 운행하중 조건에서 발생되는 침목플로팅궤도구조의 거동을 파악하고, 수치해석을 통해 침목방진패드의 스프링강성 변화가 콘크리트침목의 손상에 미치는 영향을 분석하였다. 분석결과, 침목방진패드의 좌·우측 스프링강성 증가는 콘크리트침목의 최대 응력 및 인장응력, 변위는 증가하고 레일 직하부 침목의 최대 압축응력은 감소하며, 타이바접촉부 콘크리트에서 응력집중이 되는 것으로 분석되었다. 이는 현장조사결과의 콘크리트침목 손상유형과도 일치하는 것으로서 침목방진패드의 장기간 사용에 따른 스프링강성 변화는 콘크리트침목의 응력 증가를 초래할 수 있으며, 좌우 침목의 침하량의 차이가 증가되어 콘크리트침목의 손상에 영향을 미칠 수 있음을 해석적으로 입증하였다.

• 한국산학기술학회논문지
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• 제17권10호
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• pp.403-411
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• 2016

최근 도시 지역에서 엄청난 집중 호우의 빈도가 높아지고 불투수면적의 비율이 증가하면서 침수 발생 횟수 및 침수로 인한 피해가 급증하고 있다. 대부분의 지방자치단체에서는 도시의 침수를 방어하기 위해 빗물펌프장 설치, 우수관거 개량, 빗물저류조 설치 등의 구조적인 대책을 마련하고 있으나 치수시설의 포화로 치수대책의 효과가 줄어들고 있다. 이를 보완하기 위해 다양한 홍수 예보 및 내배수시설 운영 등과 같은 비구조적인 대책이 마련되고 있다. 본 연구에서는 구조적인 대책의 한계점을 보완하기 위해 현행 빗물저류조 운영방법이 아닌 새롭게 제시된 빗물저류조 운영방법의 펌프정지수위를 결정하였다. 새롭게 제시된 빗물저류조 운영에서 펌프정지수위 결정을 위해 Huff 분포에 의해 생성한 총 48개의 강우를 생성하였다. 먼저 생성된 강우를 빈도, 분위 및 지속시간 별로 구분하였다. 생성된 강우를 적용하여 실시한 강우-유출 모의를 토대로 평균 탄력성을 산정하고 1.2 m에서 1.5 m의 범위를 결정하였다. 결정된 범위에서 하수도 시설 기준에 의한 안전율 1.25를 고려하여 최종적으로 1.2 m를 적정 펌프정지수위로 결정하였다.