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느슨한 연결의 LTE/WiFi 망에서 SDN 단말 기반 통합 구조
박준혁(Junhyuk Park),윤원용(Wonyong Yoon) 한국정보기술학회 2019 한국정보기술학회논문지 Vol.17 No.6
This paper proposes a heterogeneous network infrastructure based on Software-defined networking (SDN) which provides seamless handover between two networks without common gateway routers, in order to consolidate loosely-connected networks at low cost. In traditional network architectures, slow handover caused by mobile users incurs a lot of quality degradation. During data transmission from one network to another, network is changed that involves a separate gateway router which takes a lot of time, due to the inflexibility in the architecture. This paper addresses these issues through SDN based loosely-coupled Long-term Evolution (LTE)/WiFi infrastructure. The simulation results validate the proposed architecture and indicate very low delay during handover.
박준혁(Junhyuk Park),김병인(Byung-In Kim),김성배(Seongbae Kim),Surya Sahoo 대한산업공학회 2010 산업공학 Vol.23 No.2
In this paper, we present the study of a real passenger transportation system. Passenger transportation problem aims to transport passengers from bus stops to their destinations by a fleet of vehicles while satisfying various constraints such as vehicle capacity, maximum allowable riding time in a bus, and time windows at destinations. Our problem also has special issues such as mixed loading, consideration of afternoon problem together with morning problem, and transferring passengers between vehicles. Our solution approach consists of three serial procedures: bus route generation, bus scheduling, and post optimization. Efficient heuristic algorithms were developed and implemented for the procedures. The proposed solution approach has been successfully applied to several real world problem instances and could reduce about 10% to 15% of buses.