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In this paper, based on minimum-time consensus, a distributed algorithm is proposed to solve economic dispatch problem (EDP). Firstly, The EDP is transformed to the average consensus problem and the ratio consensus protocol is utilized to address the average consensus problem over unbalanced directed topology. The proposed algorithm is implemented in a fully distributed fashion without using any global...
GB/T 28925-2012 is a standard of P. R. China for active radio frequency identification (RFID). It defines wireless communications between reader and tag at 2.45GHz. Framed Slotted Binary Tree (FSBT) anti-collision protocol is adapted in it. However, performance of FSBT is not evaluated and parameters of FSBT are not estimated. A metrics for evaluating time performance and another metrics for evaluating...
Common smartphone authentication mechanisms (e.g., PINs, graphical passwords, and fingerprint scans) are not designed to offer security post-login. Multi-modal continuous authentication addresses this issue by frequently and unobtrusively authenticating the user via behavioral biometric signals, such as touchscreen interaction and hand movements. Because smartphones can easily fall into the hands...
Software-Defined Networking (SDN) introduces a centralized control logic and separated data plane from the control plane. Controller is the brain of a SDN network. Hence, the SDN make it easier for network engineers to monitor traffic and diagnose threats, insert and change security policies. However, it also creates security challenges which didn't exist before. In this paper, we first describe layers...
Web service runtime is an important infrastructure middleware for service-based applications. It processes exchanged messages according to web service protocols. Correct implementation of web service protocols is critical for ensuring the reliability of web service runtime. In this paper, we first introduce a Service-Oriented Description Language (SODL) to precisely and concisely describe message...
In largely distributed clusters, computing nodes are geographically deployed in various computing sites. Information processed in a distributed cluster is shared among a group of distributed processes or users by virtue of messages passing protocols (e.g. message passing interface - MPI) running on the Internet. Because of the open accessible nature of the Internet, data encryption for these large-scale...
Compared to traditional wireless network routing protocols, geographic routing provides superior scalability and thus is widely used in vehicular ad hoc networks (VANETs). However, it requires every vehicle to broadcast its location information to its neighboring nodes, and this process will compromise user's location privacy. Existing solutions to this problem can be categorized into two groups:...
The implementation of Web services specifications is the key issue of Web services container which is the infrastructure of SOC. The specifications are always depicted in natural language, which may lead to misunderstanding or ambiguity. In this situation, the implementations of the same specification by different containers will re-introduce interoperability which is supposedly addressed by Web services...
In this paper, an approach was proposed based on coalitional games to solve the problem that packets of boundary nodes cannot be forwarded. This approach can effectively motivate backbone nodes to forward packets for the boundary nodes. In order to prevent "monopoly" behavior of backbone nodes, we proposed auction mechanism for competition using auction theory. Finally, we develop a packet-forwarding...
We proposed a fully-software distributed failure diagnosis system for vehicles based on the TH-OSEK real-time embedded OS platform we previously developed. The diagnosis system puts all the ECUs into a virtual logical ring and uses the MR(Maintain Ring) algorithm and OL(Off Line) algorithm to detect a faulted ECU and isolate it without destroying the structure of the logical ring. When a faulted ECU...
Developing routing protocol for vehicular ad hoc networks (VANET) is a challenging task due to potentially large network sizes, rapidly changing topology and frequent network disconnections, which can cause failure or inefficiency in traditional ad hoc routing protocols. We propose an adaptive connectivity aware routing (ACAR) protocol that addresses these problems by adaptively selecting an optimal...
As a kind of CAN-based application layers, the CANopen protocol has been widely adopted for distributed control system. While the introduction of network gives the system some advantages, the jitter problem of system variables is induced and degrades the performance of systems. The optimal algorithm can be used to reduce the jitter of system variables. According to the CANopen transmission features,...
This paper proposes a simple and cost-effective method named transmission error approximation (TEA) for estimating the distance between two Zigbee devices. The idea is to measure and analyze statistically packet loss rates for approximate distance estimation. We have implemented an experimental prototype for the TEA using Zigbee protocol. The prototype is built on FreeScale's MCF5208 evaluation boards...
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