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To achieve better performance of sensorless control of PMSM, a precise and stable estimation of rotor position and speed is required. Several parameter uncertainties and variable measurement errors may lead to estimation error, such as resistance and inductance variations due to temperature and flux saturation, current and voltage errors due to measurement uncertainties, and signal delay caused by...
Delay Tolerant Networks have been emerged to support intermittent connectivity of frequently partitioned networks. A routing issue of Delay Tolerant Networks is concerned about the extremely long delay of opportunistic intermittent connections. For considering routing protocols of Delay Tolerant Networks, a forwarding decision and the buffer management scheme are important to improve the successful...
To operate e-mail systems stably multihomed networks are well used. As an operation method on multihomed networks, we have proposed a dynamic route selection method considering status of networks. However, status of Mail Transfer Agents(MTAs) have not been considered in this method so that a heavily loaded MTA would be possibly selected. In this paper, we propose a new dynamic route selection method...
In this paper fast mobile multicast mechanism based on IEEE 802.21 MIH (Media Independent Handover) is proposed. We solve long multicast handover delay time caused by L3 movement detection mechanism of the existing mobile multicast methods. The proposed architecture adopts multicast manager concept to MIH framework in order to efficiently perform mobile multicast handover, and adds the new MIH messages...
Most current web application use HTTP (Hyper Text Transfer Protocol) and TCP (Transmission Control Protocol) to retrieve objects from the Internet. SCTP (Stream Control Transmission Protocol) is recently proposed transport protocol with congestion control mechanism similar to that of TCP. Waiting delay is an important performance criterion for when transferring web object over the Internet. In this...
A new word-line driving scheme is proposed in this paper for suppressing oxide-tunneling leakage in sub-65-nm devices. Reducing oxide-tunneling leakage is very essential in sub-65-nm era because of this tunneling leakage component becoming more and more serious comparing with the subthreshold component. In this paper, we propose to raise the word-line-off voltage higher than 0 V thereby relaxing the...
In a computer or communication network, the reliability and transfer-delay of communication are important measures of performance. This paper describes a method of evaluating the reliability of a network with delay. When network elements fail, delay is defined as the length of the shortest remaining path between two specified nodes. We find the occurrence probability of events that a central node...
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