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Wan J.M.,Guangxi Vocational and Technical Institute of Industry
Advanced Materials Research | Year: 2014

This paper analyzes the network accounting background generated; then discusses the concept of network accounting, objectives and characteristics of its location; paper focuses on the traditional network of accounting and reflect the impact of accounting, including accounting assumptions, accounting principles, accounting reports and accounting functions of the impact study, pointed out in the Internet environment, the traditional concept of accounting change should be and try to put forward their point of view: Again, study the network accounting system, including technology-based accounting network, system, operational and enterprise applications. Finally, the network security issues were studied accounting and briefly presents the relevant strategy. © (2014) Trans Tech Publications, Switzerland.

Huang Y.,Guangxi Vocational and Technical Institute of Industry
Lecture Notes in Electrical Engineering | Year: 2014

The wireless network is to transmit data through radio waves in the air, as long as the coverage can transmit and receive data. Therefore, wireless network security for access control and privacy questions remain. Mainly in introducing the wireless network has wired equivalent privacy, search, wireless authentication spoofing attacks, information disclosure attacks, the network took over and tampering, security threats, such as denial of service attacks as well as the user's device, based on wireless network,which should adopt seven safety technologies and eight security measures. © Springer-Verlag Berlin Heidelberg 2014.

Yang X.,Guangxi Vocational and Technical Institute of Industry
Applied Mechanics and Materials | Year: 2014

Securing information system in current information era is very important task. This paper presents a novel security model in order to secure sensitive information systems. This model combines protection, detection, recovery and control mechanisms to secure information system in their development lifecycle, which is more effective than the traditional ones. © (2014) Trans Tech Publications, Switzerland.

Ma W.H.,Guangxi Vocational and Technical Institute of Industry
Advanced Materials Research | Year: 2014

Data stream in a popular research topic in big data era. There are many research results on data stream clustering domain. This paper firstly has a brief introduction to data stream methodologies, such as sampling, sliding windows, etc. Finally, it presents a survey on data streams clustering techniques. © (2014) Trans Tech Publications, Switzerland.

Meng X.,Beijing University of Chemical Technology | Meng X.,Guangxi Vocational and Technical Institute of Industry | Zheng D.,Beijing University of Chemical Technology | Wang J.,Beijing University of Chemical Technology | Li X.,Beijing University of Chemical Technology
Renewable Energy | Year: 2013

Focusing on the effective use of low-grade solar heat as heat source to provide refrigeration for residential and commercial space cooling, an absorption-compression hybrid refrigeration cycle has been studied on the basis of available data of working pair 1,1,1,2-tetrafluoroethane (R134a) and dimethylformamide (DMF). In order to investigate their performance, the energy saving mechanism of the hybrid cycle was analyzed, by means of thermodynamic diagrams of log p-T, log p-h and T-s. The results show that the hybrid refrigeration cycle has a relatively high thermodynamic perfectibility and can use low-grade heat to replace parts of mechanical work for obtaining lower temperature refrigeration effect owing to its energy complement and cascade refrigerating configuration between the internal sub-cycles. Moreover, on the basis of two new criteria, the heat powered coefficient of performance and the electricity saving rate, the competition behavior between the sub-cycles of the hybrid cycle, i.e. the trade-off effects of compressor pressure on the low-grade heat utilization performance were also investigated. It was found that the sub-cycles compete in their contribution to the hybrid refrigeration system and the cycle preferences depend on the dominance which one achieves. In other words, there is an optimum compressor outlet pressure region under specified working conditions, where the hybrid refrigeration cycle has the maximum heat powered coefficient of performance and electricity saving rate. © 2013 Elsevier Ltd.

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