To explore the effect of equivalence ratio on the propagation process of combustible gas in the venting tube, in the present study, the κ-ε turbulent model and the combustion models were implemented base on unaltered venting conditions and different equivalence ratio of methane-air. In particular, the numerical simulation results illustrate both speed and pressure were at maximum when equivalence ratio was 1.0. However, methane-air didn't reach the most sufficient combustion when equivalence ratio was 1.0. It was possible that the pressure release caught the equivalence ratio change and failed to generate detonation.
Routing information release is a kind of promise from the router for network reachability. Illegal routing information may have disastrous effects on the normal work of the network. Open Shortest Path First (OSPF) protocol provides authentication methods to protect the authenticity and integrity of the routing traffic. This paper describes two authentication types of OSPFv2, analyzes the realization mechanism and packet header format of each authentication respectively. Based on GNS3, a typical network topology was designed, and with the aid of it functional verification and security analysis are carried out. The simulation can provide a reference for building an OSPF network. Experimental results show that the configuration of OSPFv2 routing authentication can effectively prevent the router from receiving unauthorized or malicious routing updates, thereby improving network safety.
ertPS is an extension of rtPS and combines the efficiency of UGS and rtPS. Based on ertPS, base station can provide the active authorization unicast as UGS, and better than UGS. In OPNET environment, we model and simulate ertPS of moble WiMAX MAC layer scheduling algorithms based on IEEE 802.16e protocol. The simulation results compare the performance of ertPS with UGS on load, delay, delay variation and etc., and analyze QoS according to IEEE 802.16e protocol.
As the development and applying of real-time multimedia such as VoIP, video conferencing and so on, the Internet is required to provide a better QoS support. However, current IP network can only provide ‘Best Effort’ service and can not satisfy different network multimedia traffic quality requirements. Based on the analysis DiffServ architecture and studies its control mechanism, the OPNET simulation design different ToS value in IP header of VoIP traffic, and apply WFQ scheduling algorithm on the bottleneck link. The simulation results compare jitter, delay, delay variation of different ToS value of VoIP traffic, and analyze relationship of QoS and ToS value in the IP network.
By analyzing the poultry product processing procedure, this paper proposes the system design of a kind of poultry processing quality traceable data collection and transmission system and the details about the system hardware and software design. The system builds the data collection nodes platform which solves the data diversity issues. Based on the features in the production procedures of the poultry production enterprises, the system designs the datasets to ensure the connection among the servers and the end clients, and the connection among the servers and collection nodes to solve the issue of trace time. The system test illustrates the system can ensure the high accuracy of the data collection and transmission in the poultry production and circulation with practical values.
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