Earticle

This paper proposes an Efficient Scheme Fast Handover over HMIPv6 networks. The MIPv6 mobility could be more enhanced by combining FMIPv6 with HMIPv6, in which MIPv6 is benefited from all the advantages of the respective schemes. In previous work an additional benefit by combining FMIPv6 with HMIPv6 is that the overall handover latency in HMIPv6 will be more reduced since in HMIPv6 the MN sends a location update with the with NAP, rather than the HA and CN that are typically further way. An analytical study compares the handover latency of different IP mobility management Schemes, considering the different approaches of HMIPv6 and ES-FHMIPv6. This document describes the enhanced scheme of FHMIPv6 than can reduce the latency handover of message from a certain access router to another router. The ESF-HMIPv6 is designed to be effiecient with the data transport feature; we include a dual buffer in Access Point (AP) which stores the received message from Previous Access Router (PAR), the main purpose of the design scheme is to minize the handover latency time of message transmission.

A Mobile Ad hoc network (MANET) is a network consisting of a set of wireless mobile nodes, which communicate with each other without centralized control or established infrastructure. In this paper, to obtain a better understanding of AODV (Ad hoc On-Demand Distance Vector Routing Protocol) and OLSR (Optimized Link State Routing Protocol) routing protocols, different performances are simulated and analyzed using OPNET modeler 14.5 with the various performance metrics, such as packet delivery ratio, end-to-end delay and routing overhead. As a conclusion, in static analysis, the routing overhead of OLSR is affected by the number of nodes, but not data traffic. In AODV case, it is affected by both data traffic and number of nodes. In mobility analysis, routing overhead is not greatly affected by mobility speed in AODV and OLSR, and the PDR (Packet Delivery Ratio) of OLSR is decreased as the node speed increased, while AODV is not changed. As to delay, AODV is always higher than OLSR in both static and mobility cases.

In this paper, we propose a Cooperative Transmission Strategy using Entropy-based Relay Selection in Mobile Ad-hoc Wireless Sensor Networks (MAWSN) with Rayleigh Fading Environments. The main features and contributions of the proposed cooperative transmission strategy are as follows. First, the entropy-based relay selection is used to improve reliability of data transmission from a source node to a destination node. Second, we present a theoretical analysis model for the proposed cooperative transmission strategy with the outage probability of the end-to-end performance. The performance evaluation of our protocol is implemented via simulation and analysis.

The purpose of this paper is to explain the lessons learned during modernization of Kori-1 and Korean standard nuclear power plants. Kori-1 main control room was partially modified in 2007 and will be renovated entirely in 2013. Digital devices have been introduced and standard alone computer systems have been integrated into the plant computer. The initial scope and period of modernization have changed due to configuration and economical constraints. Upgrading KSNP I&C is planned for 2015. However, the site engineers and operators are reluctant to the advanced systems. A prototype is being developed to evaluate user interfaces and I&C architecture, and increase the acceptance level of the operators and field engineers. The 1st layer displays are based on a simplified P&ID, and the 2nd and 3rd layers are edited for additional information. The layers are linked through a context sensitive menu. The end point view of MCR is also suggested considering reliability and operability of the digital systems. Finally, modernization strategies over the overhaul periods, that do not have much impact on operation and configuration efforts are suggested. The 1st and 2nd stages are scheduled for non-safety and safety I&C upgrade, respectively. The final stage is devoted to MCR upgrade.