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Analytical Approach of New Random-walk Based Mobility Management Scheme in IP-based Mobile Networks
Myungseok Song,Jongpil Jeong,Jun-Dong Cho 국제문화기술진흥원 2014 International Journal of Advanced Culture Technolo Vol.2 No.1
In next-generation wireless networks, provisioning of IP-based network architecture and seamless transmission services are very important issues for mobile nodes. For this reason, a mobility management mechanism to support global roaming is highly regarded. These technologies bring a broader life by using a global roaming account through the connection of multiple devices or technology to mobile users; they also provide real-time multimedia services. This paper presents a comprehensive performance analysis of fast handover for hierarchical mobile IPv6 (F-HMIPv6), hierarchical mobile IPv6 (HMIPv6), Proxy Mobile IPv6 (PMIPv6), and fast Proxy Mobile IPv6 (FPMIPv6) using the fluid-flow model and random-walk model. As a result, the location update cost of the PMIPv6 and FPMIPv6 is better than that of HMIPv6 and F-HMIPv6. These results suggest that the network-based mobility management technology is superior to the hierarchical mobility management technology in the mobility environment.
Design of High-Speed CAVLC Decoder Architecture for H.264/AVC
Myungseok Oh,Wonjae Lee,Yunho Jung,김재석 한국전자통신연구원 2008 ETRI Journal Vol.30 No.1
In this paper, we propose hardware architecture for a high-speed context-adaptive variable length coding (CAVLC) decoder in H.264. In the CAVLC decoder, the codeword length of the current decoding block is used to determine the next input bitstreams (valid bits). Since the computation of valid bits increases the total processing time of CAVLC, we propose two techniques to reduce processing time: one is to reduce the number of decoding steps by introducing a lookup table, and the other is to reduce cycles for calculating the valid bits. The proposed CAVLC decoder can decode 1920×1088 30 fps video in real time at a 30.8 MHz clock.
( Myungseok Song ),( Jun-dong Cho ),( Jong-pil Jeong ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.2
The development of multimedia applications has followed the development of high-speed networks. By improving the performance of mobile devices, it is possible to provide high-transfer-speed broadband and seamless mobile multicasting services between indoor and outdoor environments. Multicasting services support efficient group communications. However, mobile multicasting services have two constraints: tunnel convergence and handoff latency. In order to solve these problems, many protocols and handoff methods have been studied. In this paper, we propose inter local mobility anchor (inter-LMA) optimized handoff model for mobile multicasting services in proxy mobility IPv6 based (PMIPv6-based) networks. The proposed model removes the tunnel convergence issue and reduces the router processing costs. Further, it the proposed model allows for the execution of fast handoff operations with adaptive transmission mechanisms. In addition, the proposed scheme exhibits low packet delivery costs and handoff latency in comparison with existing schemes and ensures fast handoff when moving the inter-LMA domain.
( Myungseok Song ),( Jongpil Jeong ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.4
Mobile traffic is increasing a masse because of the propagation of the Internet and the development of wireless mobile technology. Accordingly, the Network Local Mobility Management (NETLMM) working group [1] of the Internet Engineering Task Force (IETF) has standardized Proxy Mobile IPv6 (PMIPv6) [2] as a protocol for accomplishing the transmissibility of mobile terminals. PMIPv6 is a network-led IP-based mobility management protocol, which can control terminal mobility without depending on the type of access system or the capability of the terminal. By combining PMIPv6 and the mobility of Session Initiation Protocol (SIP), we can establish terminal mobility and session mobility through a more effective route. The mobility function can be improved and the overlap of function reduced as compared to that in the case of independent operation. PMIPv6 is appropriate for a non-real-time service using TCP, and SIP is appropriate for a real-time service using RTP/UDP. Thus, in the case of a terminal using both services, an effective mobility management is possible only by using PMIPv6 together with SIP. In order to manage mobility in this manner, researches on PMIPv6-SIP are in progress. In line with this trend, this paper suggests a new PMIPv6-SIP architecture where when a mobile terminal conducts a handover, a network-led handover while maintaining the session without the addition of a special function or middleware is possible along with effective performance evaluation through mathematical modeling by comparing the delay and the packet loss that occur during the handover to the Pure-SIP.
A Study to Optimize a Commerical Vehicle Fuel Consumption Using Vehicle Simulation
Myungseok Lyu,Steven Whelan,Ben Rogers 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1
An approach to optimizing vehicle fuel economy is described based on a study of a commercial vehicle. The approach is based on using a V-SIM software vehicle simulation to identify the relative efficiency of each of the vehicle systems, such as the engine hardware, engine software calibration, transmission, cooling system and ancillary drives. The simulation based approach offers a detailed understanding of what vehicle systems are underperforming and by how much the vehicle fuel economy can be improved if those systems are brought up to best-in-class performance. In this way, the optimum vehicle fuel economy can be provided to the vehicle customer. A further benefit is that the simulation requires only a minimum of vehicle testing for initial validation, with all subsequent field test cycles performed in software, thereby reducing development time and cost for the manufacturer.
류명석(Myungseok Lyu),신재영(Jaeyong Shin),진봉용(Bongyong Jin) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This study was initiated to evaluate the cooling performance of CAC (charged air cooler) and radiator in the engine room of a mini bus. So we had firstly to predict the mass flow rate coming from radiator grille and front bumper opening using computational fluid dynamics (CFD) simulation based on 3D configuration. And simulations were carried out for different cooling module layout and bumper opening hole size on same vehicle operating condition. Simulation results show that CAC cooling performance at reverse protecting plate-applying model was much efficient than that of the bumper opening hole size-increasing model in IMTD point of view. Part of the CFD simulation results was compared to with experimental data It was confirmed that the CFD approach using STAR-CD based on pursuing no-compromise solution could provide design engineers with useful design information in the early design stage of vehicle development<br/>
강명석(Myungseok Kang),김학배(Hagbae Kim) 한국통신학회 2009 韓國通信學會論文誌 Vol.34 No.1B
본 논문에서는 효율적인 객체 관리와 고장 회복을 위해 에이전트 기술과 중복 메커니즘을 이용한 고장허용 객체그룹(Fault Tolerant Object Group, FTOG)를 기반으로 에이전트 기반의 고장허용 객체그룹 모델을 제안한다. 고장허용 객체그룹의 확장된 기능으로 다섯 가지의 에이전트 - 내부처리 에이전트, 등록 에이전트, 상태처리 에이전트, 사용자인터페이스 에이전트, 서비스 에이전트를 정의하였다. 제안된 모델에서 에이전트들의 역할은 분산된 객체들의 상호작용을 줄이고 보다 효과적인 서비스를 제공하는데 있다. 에이전트 기반의 고장허용 객체그룹 모델의 효율성을 검증하기 위해 홈네트워크 서비스를 제공하는 가상의 지능형 홈네트워크 시뮬레이터를 구현하였다. 시뮬레이션을 통하여 제안한 모델은 객체들 간의 상호작용을 줄이고(부하감소) 효율적인 고장 회복 등 안정적이고 신뢰성 있는 서비스를 제공함을 검증하였다. We propose an Agent-based Fault Tolerant Object Group model based on the agent technology and FTOG model with replication mechanism for effective object management and fault recovery. We define the five kind of agents - internal processing agent, registration agent, state handling agent, user interface agent, and service agent - that extend the functions of the FTOG model. The roles of the agents in the proposed model are to reduce the remote interactions between distributed objects and provide more effective service execution. To verify the effectiveness of the proposed model, we implemented the Intelligent Home Network Simulator (IHNS) which virtually provides general home networking services. Through the simulations, it is validated that the proposed model decreases the interactions of the object components and supports the effective fault recovery, while providing more stable and reliable services.