Through analyzed and researched the respective advantages of PID and IMC system, and integration of the advantages of both, combined with the realization question of IMC based on its structure, proposed a method of PID parameter tuning based on thoughts of IMC, compared internal (model controller with the traditional PID controller to determine each parameter values of PID control system of IMC,designed the PID control system of IMC. Practical application shows that,in the case of disturbance and mismatch in the parameters, this system can still obtain better control effect, beneficial in engineering applications.
To prolong network lifetime, nearest-neighbor clustering power control algorithm is proposed. In the algorithm, k-means algorithm is used to divide nodes into k different clusters. Nearest-neighbor distances algorithm is used to calculate the optimal transmission power of nodes which are in the same cluster. Then sink node broadcasts to inform other nodes that they use optimal transmission power for communicating with neighbor nodes which are in the same cluster and use default maximum transmission power for communicating with neighbor nodes which are in the different clusters. Simulation results show that by selecting the appropriate parameters, NNCPCA can prolong network lifetime, reduce network latency time and enable cost-effective energy consumption. Under certain conditions, it is fit for multi-cluster wireless sensor networks.
In this paper, a portable virtual laboratory was created with virtual machine software, VMware, for experimenting information security hands-on exercises. The laboratory would be easily applied to a traditional computer classroom with inexpensive/free virtual machine software. Information security students can do hands-on exercises with the portable virtual laboratory anywhere by hosting all image files of the laboratory on a portable USB disk. An information security curriculum was redesigned with the portable virtual laboratory. Examples of hands-on exercises, inner- and inter-team projects, were presented.
In the increasing requirements of quick responses to the market, for the market competition became more fiercely and the customers' diversified needs of product increased. Enterprises realized the importance of collaboration between suppliers and partners, especially for saving response time to order. More and more enterprises feel the time pressure during the process of customer's need when they should satisfy customer's individual demands. Lowering down the logistics time means lowering logistics cost, especially the stock cost. Thus the market competition ability of business enterprises could be raised. While RFID(Radio Frequency Identification) techniques could reduce the dealing time on supply chain. How to use RFID techniques to decline inventory and waste is a tough issue. This article targeted on collaboration of supply chain in clothing industry for research object, a valid method for modeling of real-time supply chain collaboration was proposed. RFID technology was applied in stock management, as optimization method was adopted for inventory control based collaboration. A collaboration model was build to decline time, cost and waste. Finally, the application method was verified according emulation.
Wireless sensor network (WSN) can provide the popular military and civilian applications such as surveillance, monitoring, disaster recovery, home automation and many others. All these WSN applications require some form of self-managing and autonomous computing without any human interference. Recently, ontology has become a promising technology for intelligent context-aware network management. It may cope with various conditions of WSNs. This paper describes an ontology-based management model for context-aware management of WSNs. It provides autonomous self-management of WSNs using ontology-based context representation, as well as reasoning mechanisms.
