Zhanfang Chen

Research on Network Security Situation Assessment and Quantification Method Based on Analytic Hierarchy Process

In hierarchical network security situation assessment model, there are many problems, such as subjective index weight factor, large evaluation index system, large amount of calculation and low efficiency. A network security situation assessment model and quantification method based on AHP is proposed to solve this problem. The AHP analytic hierarchy process (AHP) is combined with the hierarchical model of situation assessment to simplify the situation assessment problem. The D–S evidence theory is used to fuse the fuzzy results of multi-source equipment to solve the problem of single information source and large deviation of accuracy. Through the construction of three evaluation indexes of risk situation, basic operation situation and damage situation, the problem of large evaluation index system and low evaluation efficiency is solved. AHP analytic hierarchy process is used to determine the weights of different index items, so as to avoid the subjectivity and randomness of weighting factors. The simulation results show that the model can reflect the security status of the network as a whole, and the situation assessment is accurate and can better serve the high-level decision-making.

Identifying Change and Propagations in Product Development Project

The aim of this paper is to provide some exploratory results concerning change modelling and propagation in Product Development (PD) project as a theoretical contribution to the change management theory. In order to identify changes, we propose a conceptual model of change occurring and change propagation relying on objects, which are the elements composing the PD project as a system, and then we observe the objects to compare their initial constraints with the actual performance to perceive the potential changes. With the result, changes in a PD project can be perceived and identified in underlying way to improve the further change management work in terms of various considerations of project evolvement.

Dynamic Consistency Adjustment Mechanism of Distributed Cloud Data Storage Based on Hotspot

In order to solve the problems of the dynamic consistency of data replications and the dynamic management of hotspot data, a consistency adjustment mechanism for high frequency access data based on Hotspot is proposed. The hotspot buffer is built to improve the data access speed. The request minimum success rate, the resource access rate, online resource access frequent and accessible data rate are used to adjust the data in hotspot buffer dynamically. The storage location of data replication is changed dynamically by data access traffic. The result shows that, compared with static replication management, the data access time is reduced significantly, especially when the data scale is large, and the average time is shortened by about 18%.

A CAVE-based stereoscopic displaying approach of reconstructing simulated endoscope scene

This paper analyzes employing the stereoscopic vision methods to display the 3-dimension (3D) medical models through focusing on the displaying means and the principles of stereoscopic vision. Relying on the perspective projections, the target spatial object is re-projected corresponding to left and right eyes to re-generate the stereoscopic perspective projections respectively and produce the parallax.