• 한국수소및신에너지학회논문집
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• 제31권6호
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• pp.605-613
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• 2020

In July and October of this year, the government announced the 'Green new deal plan within the Korean new deal policy' and 'Strategies for proliferation of future vehicles and market preoccupation'. And, in response to changes in the global climate agreement, it has decided to expand green mobility such as electric vehicles and hydrogen electric vehicles with the aim of a "net-zero" society. Accordingly, the goal is to build 310 hydrogen refueling stations along with the supply of 60,000 hydrogen vehicles in 2022, and the hydrogen infrastructure is being expanded. however, it is difficult to secure hydrogen infrastructure due to expensive construction costs and difficulty the selection of a site. In Korea, it is possible to build a mobile hydrogen station according to the safety standards covering special case of the Ministry of Industry. Since the mobile hydrogen station can be charged while moving between authorized place, it has the advantage of being able to meet a large number of demands with only one hydrogen refueling station, so it is proposed as a model suitable for the early market of hydrogen infrastructure. This study demonstrates the establishment of a hydrogen refueling station by deriving a virtual accident scenario for leakage and catastrupture for each facility for the risk factors in a mobile hydrogen station, and performing a quantitative risk assessment through the derived scenario. Through the virtual accident scenario, direction of demonstration and implications for the construction of a mobile hydrogen refueling station were derived.

• 상하수도학회지
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• 제37권6호
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• pp.335-345
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• 2023

In Korea, as part of the Green New Deal project toward a carbon-neutral society, it is necessary to build a climate-resilient urban environment to green the city, space, and living infrastructure. To this end, SWMM-ING was improved and the model was modified to analyze the carbon reduction effect. In addition, I plan to select target watersheds where urbanization is rapidly progressing and evaluate runoff, non-point pollution, and carbon reduction effects to conduct cost estimation and optimal design review for domestic rainwater circulation green infrastructure. In this study, green infrastructure facilities were selected using SWMM-ING. Various scenarios were presented considering the surface area and annual cost of each green infrastructure facility, and The results show that the scenario derived through the APL2 method was selected as the optimal scenario. In this optimal scenario, a total facility area of 190,517.5 m² was applied to 7 out of 30 subwatersheds to achieve the target reduction. The target reduction amount was calculated a 23.50 % reduction in runoff and a 26.99 % reduction in pollutant load. Additionally, the annual carbon absorption was analyzed and found to be 385,521 kg/year. I aim to achieve additional carbon reduction effects by achieving the goal of reducing runoff and non-point pollution sources and analyzing annual carbon absorption. Moreover, considering the scale-up of these interventions across the basin, it is believed that an objective assessment of economic viability can be conducted.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제12권3호
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• pp.160-169
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• 2006

본 연구의 목적은 글로벌 인터넷 환경에 부합할 수 있는 새로운 형태의 에이전트 등록/저장소 시스템을 설계하는 것이다. 이를 위해, 먼저 ebXML, UDDI, FIFA DF와 같은 핵심 기술에 대한 사전연구를 진행하였고 그 결과로 ebXML을 활용한 에이전트 등록 및 저장소 시스템을 설계하였다. 제안하는 시스템은 에이전트의 등록과 저장, 검색을 위해 ebXML이 어떻게 활용될 수 있는지를 보여주며, 서로 다른 에이전트 플랫폼에서 개발된 에이전트가 어떠한 방법과 절차를 통해 등록되고 검색될 수 있는지를 설명한다. 본 시스템을 활용할 수 있는 전형적인 예를 보여주고, 본 시스템의 장점을 기술한다.

• 한국게임학회 논문지
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• 제19권6호
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• pp.61-70
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• 2019

본 논문에서는 경영 시뮬레이션 게임 분야에서 강화학습을 적용하여 게임 에이전트들이 자율적으로 주어진 목표를 달성하는지를 확인하고자 한다. 본 시스템에서는 Unity Machine Learning (ML) Agent 환경에서 PPO (Proximal Policy Optimization) 알고리즘을 적용하여 게임 에이전트가 목표를 달성하기 위해 자동으로 플레이 방법을 찾도록 설계하였다. 그 유용성을 확인하기 위하여 5가지의 게임 시나리오 시뮬레이션 실험을 수행하였다. 그 결과 게임 에이전트가 다양한 게임 내 환경 변수의 변화에도 학습을 통하여 목표를 달성한다는 것을 확인하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권12호
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• pp.5759-5779
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• 2017

As the main means to cope with the stubborn problem of drunk driving, the inspection of drunk driving has already been paid more attention and thus reinforced. In this paper, we model this scenario as a Stackelberg game, where the police department (called defender) allocates resources dynamically in terms of the traffic situation on the traffic network to arrest drink drivers and drivers who drink (called attacker), whether choosing drunk driving or designated driving service, expect to minimize their cost for given travel routes. However, with the number of resources are limited, our goal is to calculate the optimal resource allocation strategy for the defender. Therefore, first, we provide an effective approach (named OISDD) to fulfill our goal, i.e., generate the optimal strategy to inspect drunk driving. Second, we apply OISDD to directed graphs (which are abstracted from Dalian traffic network) to analyze and test its correctness and rationality. The experimental results show that OISDD is feasible and efficient.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2010년도 춘계학술대회 논문집
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• pp.2292-2296
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• 2010

2020 Korea GHG reduction goal is decreasing 4% compared with that of 2005. Effective counterplan of GHG redection goal needs to set for inductrial allocation and various reduction GHG technologies and policies for transportation have been developed. Modal shifr is one of these main policy and it focused on shifting as much freight as economically meaningful under current market conditions. It improves energy efficiency, consequently reduces GHG effect. This study is proposed as a preliminary studay of analyzing Modal shift effect. modal shift of car travelers to train is concerned in Seoul-Busan section, This study is based on a scenario which can maximize passenger occupancy rate to get the GHG reduction effect and the effect of modal shift of car to train is identified. According to this result, we can get GHG reduction effect through dealing with maximizing passenger occupancy rate on train. Therefore, in order to enhance this modal shift effect, train using rate need to increased and also improvement of policies and cost system are need to be considered to promote increasing use of train.

• 한국심리학회지 : 문화 및 사회문제
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• 제29권4호
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• pp.617-636
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• 2023

본 연구는 한국인이 보이는 욕구-현실 충돌에서 나타나는 극복 노력 현상(불굴의 의지)을 한국인의 문화적 특성으로 설명하고자 하였다. 구체적으로 자신의 욕구와 현실 간의 충돌이 발생한 상황에서 개인의 주체성 정도에 따라 그 상황을 대하는 행동 양식이 달라지는지를 살펴보았다. 이를 위해 총 217명의 참여자가 온라인 실험에 참여하였고, 최종적으로 156명의 데이터가 분석되었다. 참여자는 주체성 척도에 응답한 뒤, 상충적 요소가 존재하는 의사결정 시나리오에 노출되었다. 시나리오는 집 구매와 결혼식장 계약 시나리오였고, 각 시나리오에서는 중요하게 여겨지는 두 개의 가치가 시장에서 서로 상충되도록 설정되었다. 참여자는 해당 시나리오를 읽고 각 가치에 대해 스스로가 원하는 수준을 입력하였다. 그 뒤, 시나리오 속 대리인이 참여자가 원하는 수준의 후보지를 찾지 못한 상황을 접하게 된다. 이후, 참여자는 스스로 자신이 직접 나서 추가적인 노력을 할 의향에 대해 응답하였다. 연구 결과, 참여자의 주체성 정도는 추가적인 노력 정도에 정적인 관계를 나타냈다. 또한 현실 한계를 초과하여 원하는 수준(기대 불일치)의 정도는 주체성을 통제한 상태에서 추가적인 노력 정도에 대해 비선형(역 U형)의 영향력을 나타냈다. 나아가 주체성과 기대 불일치 간의 상호작용효과가 유의하였다. 구체적으로 주체성이 낮은 개인은 기대 불일치 정도와 종속변인 간의 관계가 유의하지 않았으나, 주체성이 높은 개인은 기대 불일치 정도와 종속변인 간의 비선형 관계가 유의하였다. 연구 결과를 바탕으로 욕구-현실 충돌 장면에서의 한국인의 심리적 특성(주체성)의 역할과 기능에 대해 논하였다.

• Journal of Information Processing Systems
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• 제3권1호
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• pp.1-7
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• 2007

In mobile ad hoc networks, an application scenario requires mostly collaborative mobility behavior. The key problem of those applications is scalability with regard to the number of multicast members as well as the number of the multicast group. To enhance scalability with group mobility, we have proposed a multicast protocol based on a new framework for hierarchical multicasting that is suitable for the group mobility model in MANET. The key design goal of this protocol is to solve the problem of reflecting the node's mobility in the overlay multicast tree, the efficient data delivery within the sub-group with group mobility support, and the scalability problem for the large multicast group size. The results obtained through simulations show that our approach supports scalability and efficient data transmission utilizing the characteristic of group mobility.

• Journal of Communications and Networks
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• 제11권2호
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• pp.187-195
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• 2009

The application of mathematical analysis to the study of wireless ad hoc networks has met with limited success due to the complexity of mobility, traffic models and the dynamic topology. A scenario based universal mobile telecommunications system (UMTS) time division duplex (TDD) opportunistic cellular system with an ad hoc behaviour that operates over UMTS frequency division duplex (FDD) licensed cellular network is considered. In this paper, we present a new routing metric which overall improves system performance in terms of interference and routing which operate in an ad hoc network in an opportunistic manner. Therefore we develop a simulation tool that addresses the goal of analysis and assessment of UMTS TDD opportunistic radio system with ad hoc behavior in coexistence with a UMTS FDD primary cellular networks.

• 시스템엔지니어링학술지
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• 제8권1호
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• pp.77-82
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• 2012

In Weapons acquisition process, if the requirements are not clear, it leads to confusion and conflict in business. In the development of next-generation weapons, to define and derive requirements has to start from decision of operational concept. It is difficult task and has many uncertainties. This paper has goal about development of knowledge acquisition process that derive military operational scenario-based requirements acquisition process and framework that classify and save the derived requirements for next project. That framework can generate new class and category, also suggest that verification of requirements. It help to derive and manage the requirements, and make it easy to grasp the requirements. Accordingly, it can help make military requirement plan and weapon acquisition process.