A5103157604- IPv6, Mobility, Handover, Networks, Security
- Network Traffic and Congestion Control
- Mobile Ad Hoc Networks
- Advanced Wireless Network Optimization
- Software-Defined Networks and 5G
- Vehicular Ad Hoc Networks (VANETs)
- Mobile Agent-Based Network Management
- Caching and Content Delivery
- Opportunistic and Delay-Tolerant Networks
- Wireless Networks and Protocols
- Multimedia Communication and Technology
- Peer-to-Peer Network Technologies
- Advanced Optical Network Technologies
- Service-Oriented Architecture and Web Services
- Advanced Queuing Theory Analysis
- Energy Efficient Wireless Sensor Networks
- Security in Wireless Sensor Networks
- Internet of Things and Social Network Interactions
- Cloud Computing and Resource Management
- Technology and Data Analysis
- Wireless Body Area Networks
- Data Management and Algorithms
- Information and Cyber Security
- Interconnection Networks and Systems
- IoT and Edge/Fog Computing
Ewha Womans University
2006-2018
Dankook University
2010
Baewha Women's University
2002
North Carolina State University
1995
It is expected that up to 26 billion Internet of Things (IoT) equipped with sensors and wireless communication capabilities will be connected the by 2020 for various purposes. With a large scale IoT network, having each node an individual connection may face serious scalability issues. The problem network alleviated grouping nodes into clusters representative in cluster connect on behalf other instead per-node communication. In this paper, we propose multi-hop clustering mechanism networks...
We propose an ad-hoc multicast routing protocol, referred to as PatchODMRP. PatchODMRP extends the ODMRP (on-demand protocol), which is a mesh-based protocol proposed for networks. In ODMRP, nodes that are on shortest paths between group members selected forwarding (FG) nodes, and form mesh group. The reconfigures periodically adapt it node movements. When number of sources in small, usually formed sparsely can be very vulnerable mobility. this case, frequent reconfigurations required...
While existing research shows that reactive congestion control mechanisms are capable of providing high video quality and channel utilization for point-to-point real-time video, there has been relatively little study the point-to-multipoint especially in ATM networks. Problems complicating provision multipoint, feedback-based service include: (1) implosion feedback returning to source as number multicast destinations increases (2) variance amount available bandwidth on different branches...
The information security management systems (ISMS) of 5 hospitals with more than 500 beds were evaluated regards to the level security, management, and physical technical aspects so that we might make recommendations on countermeasures which meet both international standards needs individual hospitals.The ISMS check-list derived from international/domestic was distributed each hospital complete staff interviewed. Information Security Indicator Values used estimate present levels evaluate...
Reliability as well efficiency of transmissions is a paramount issue for the safety critical services VANET due to urgency and/or significance messages. To this end,various retransmission mechanisms have been studied reliable broadcast message delivery in VANETs. Most existing approaches, though, rely on periodic beacons decisions and intrinsically require high control overheads. Especially, urban environments where traffic density tends be high, minimizing overheads important not only but...
The emergence of multiprotocol label switching (MPLS) with its efficient support explicit routing provides basic mechanisms for facilitating traffic engineering. Exploiting this capability MPLS, we propose an adaptive multipath engineering mechanism named LDM (load distribution over multipath). main goal is to enhance the network utilization as well performance by adaptively splitting load among multiple paths. takes pure dynamic approach not requiring any a priori statistics. Routing...
Mobile WiMAX provides mobile wireless broadband services for data communication by using IP protocol. In order to provide various IP-based applications, managing the efficiency of resources is necessary at radio links. Pay load Header Suppression (PHS) defined as an optional header compression mechanism in enhance link utilization. It has, however, a very limited capability. We, therefore, propose deploy ROHC, which proposed higher environments, instead PHS. We study performance ROHC over...
This paper proposes a new QoS framework, called the on-demand path framework (ODP). ODP provides end-to-end guarantees to individual flows with minimal overhead, while keeping scalability characteristic of Diff-Serv. exercises per-flow admission control and bandwidth reservation at edge network only differentiates traffic classes in core network. In addition, adapt dynamically changing load, monitors utilization performs dynamic reconfiguration core. Through extensive simulations,...
In the near future, wide variety of wireless networks will be merged into Internet and allow users to continue their application with higher degree mobility. such environment, multimedia applications, which require smooth rate transmission, become more popular. There are two main reasons that cause difficulties in transmission stream media when a user roams around mobile networks: 1) packets may get lost due re-routing caused by handoffs; 2) disparity amount available bandwidth among cells,...
Due to the risky and power limited environment, sensor nodes deployed in wireless networks are susceptible a large-scale damage which usually causes simultaneous failures of group collocated sensors thus gets network fragmented into distinct partitions. In order make application operative under situation, repairing overall connectivity is crucial. Moreover, restoration may be subject heterogeneous quality service (QoS) requirements between this paper, we study an effective strategy for...
Safety services of Vehicular Ad Hoc Network (VANET) require reliable broadcasts. We propose a broadcast mechanism for urban roads called VANET Broadcasting Urban areas based on Road Layout (VBURL), which tries to minimize the dependency information that may become inaccurate maximize efficiency broadcast. Specifically, proposed takes into account road layout accessible from digital map and only real‐time obtained messages or beacons. VBURL basically makes vehicle is farthest current...
With the advance of various wireless access technologies, demand for a mobile user equipped with multiple air interfaces simultaneously executing diverse applications emerged. In such network environment, per- application mobility management is key to allow each an end device dynamically and fully take advantage most suitable technology. this paper, we devised comprehensive architectural platform cross- layer techniques realize disruptive technology, i.e., management. Four core functional...
In this paper, we have proposed a hybrid P2P overlay approach with tree optimization, referred to as HOWTO, for live media streaming. the scheme, network consists of mesh and overlay. The is organized by peers that similar bandwidth ranges in geographical place. formed promoting are considered stable members overlay, constructed over Depending on optimization mechanism, which large will be near source node evenly distributed branches depth.
Multimedia applications, such as streaming media, will become very popular in future heterogeneous wireless networks. There are two main reasons for difficulties the smooth transmission of a media application during user movement: (1) packets may get lost due to re-routing caused by. handoffs; (2) disparity amount available bandwidth among cells, handoffs cause congestion. We propose an end-to-end multipath scheme that provides comprehensive solution handoff media. In proposed scheme,...
Broadcast is a typical message dissemination mechanism for emergency notifications, traffic information, notice and advertisement messages in VANETs. In this paper, we identify the cases that broadcast cannot be propagated with Contention-Based Forwarding approach which one of most representative approaches VANETs propose road-based more reliable dissemination.
무선 단말과 자동차 산업의 발전으로 도로 위의 차량들이 데이터 전달의 주체가 되는 차량 애드 혹 네트워크(Vehicular Ad hoc Networks, VANET)에 대한 연구가 활발하다. 차량에 의해 전달되는 데이터는 승객/운전자의 안전 및 교통 혼잡에 영향을 주는 긴급한 정보를 포함하고 있으므로 빠르고 신뢰성 있게 전달되어야 하고, 이를 위한 라우팅 프로토콜은 VANET의 성능에 큰 미친다. 이에 본 논문에서는 전달에 참여하는 차량의 이동 방향이 성능이 미치는 살펴보고, 기반으로 신호등이 있는 도로에서 메시지를 전파하기 위해 CBF(Contention-Based Forwarding)를 확장하는 방안을 제안한다. 제안하는 방안은 메시지 전파의 신뢰성을 높이면서도 전달 간의 위치 관계 변화에 의한 루프와 전달이 중단되는 등의 문제를 발생시키지 않는다. 또한 시뮬레이션을 통하여 적용한 CBF(R-CBF)와 기존 연구 중 향상시키되 전파 방향과 반대로 이동하는 차량을 차량으로...
이동 네트워크 환경에서 MN(Mobile Node)의 핸드오버 후 새로운 경로 상에 자원을 예약할 때 시그널링 지연을 최소화하기 위해서는 이전 경로와 경로가 만나는 지점에 있는 노드인 크로스오버 노드(Crossover Node:CRN)를 발견하는 것이 중요하다. 일반적으로 노드의 발견은 MN과 CN(Correspondent Node)간 설립된 종단간 SID(Session ID)를 주요키로 사용하여 이루어지지만, HMIPv6(Hierarchical Mobile IPv6) 네트워크에서 MAP(Mobility Anchor Point)과 HA(Home Agent)간 군집(Aggregate) 세션 단위로 자원예약을 하는 경우에는 이와 같은 일반적인 방법의 적용이 어렵다. 군집 예약을 할 때에는 SID와는 별도로 SID를 사용하는데, MN의 MAP과 HA간 세션의 SID가 SID와 달라서 이용하여 노드를 발견할 수 없기 때문이다. 이에, 본 논문에서는 HMIPv6 차세대 프로토콜인...