Advanced Materials Research Vols. 268-270

Abstract: A coupled thermo-mechanical model is used to simulate two-dimensional orthogonal cutting process based on simulation model of micro-cutting. The temperature effect in micro-cutting process is studied deeply through FEM combined with micro-cutting experiments. The results indicate that cutting temperature decreases at the tool-chip interface with reduction in uncut chip thickness at high cutting speed and large uncut chip thickness. The temperature drop tends to have a hardening effect on the material strength, which in turn causes an increase in the specific cutting energy.

Abstract: According to modern digital flatness assessment attributes, it is required to eliminate interference points by the most simple and fast algorithm, reducing scanning time of data and then optimizing the flatness assessment algorithm. The flatness algorithm by linear filter is suggested to seek out the candidate feature points of flatness, on the smallest inclusion surface, with no more than two high (or low) points on one line, no more than three high (or low) points on one flat surface, and we therefore propose the corresponding searching methods. This model is easy to implement in a computer, and the algorithm is simple, decreasing the number of searches, and also guarantee to be consistent with the new generation of GPS precise interpretation of the principle of minimum zone.

Abstract: To deepen the student’s comprehension and visual impression of mining knowledge while avoiding the risk and cost of visiting real mines, a virtual mine teaching platform was developed with 3DS as modelling tool and virtools as programming tool. Having this teaching platform, students can visually obverse the 3D layout of mines and mining procedures, roam about the mine, and even manipulate the mining device interactively, get judgment of his actions. This teaching platform greatly enhance the efficiency, safety and quality of mining speciality education, it also has good prospect to mine staff training and mining experiment.

Abstract: Given the customer requirements for personalized product increased, the contradiction between actual products and customer satisfaction was existed. Analyzing the present situation of design templates, the product configuration approach based on design templates was proposed. The importance of template objects was sorted in descending to enhance the customer satisfaction for configuring product. A typical application of a small agricultural machinery product design was given to demonstrate the feasibility and effectiveness of the design approach.

Abstract: In this paper, we investigate the dynamics of an epidemic model with birth anddeath and reaction-di usion processes in heterogeneous metapopulation networks. By mean- eld analysis, we obtain the conditions that the disease will outbreak on networks for somespeci c cases. This reminds us both the structure of the networks and population demographyplay an important role on the spread of infectious disease.

Abstract: The limitations in complexity and scalability of current combined input and cross-point queuing switching scheduling policies are first analyzed. To overcome the deficiencies in supporting fair and QOS scheduling, we propose a fair and simple high-performance scheduling algorithm for Combined Input-Cross-point-Queued Switches, which is called Fair Service and Group Smoothed Round Robin (FGSR). The main idea of FGSR is that it first groups flows according to their weight, then decides which group to be scheduled by SRR and finally decides which flow from the selected group to be scheduled. FGSR is based on round robin mechanism, whose complexity is only O(1). FGSR groups and schedules flows according to the weight of flows, thus it has good fairness and can adapt to the need of real-time performance. Theoretical analysis and simulation results show that FGSR exhibits good delay, throughput and anti-burst performance.

Abstract: With technology advances, the interdependence of various infrastructures has increased, which enhances their vulnerabilities. The national information infrastructure security concerns the nation's stability and economic security. Risk assessment methodology was introduced into the safeguard of the information infrastructure, which is prone to terrorist attack. Through the analysis of terrorists’ behaviors and its characteristics, the four steps of risk management were studied in detail using many factual examples. The macroscopic and microscopic countermeasures were developed lately, which attribute to adopting counteractions to reduce the vulnerability and relieve the risk in the modern society caused by terrorist attack.

Abstract: Video processing and cache capacity in embedded system in camera is the key to decide intelligence of shooting system. In particular, to meet the demand for continuous monitoring in video surveillance environment, the embedded system must be able to store the video in case of failure in network or server. In this paper, a storage method for videos with fixed size is proposed, which can effectively restrain occurrence of fragment during storage and raise I/O performance while ensuring continuity of monitoring. Furthermore, storage of video data based on H.264/AVC encoding system and its optimization are also discussed.

Abstract: In this paper, we consider the population models with discrete delays and impulsivee ects. By utilizing a Lyapunov-like functions coupled with certain Razumikin techniques, weobtain conditions for permanence of population models with discrete delays and impulsivee effects.

Abstract: Data exchange is one of the key problems of information integration. The most important process in data exchange problem is how to solute it based on circulatory dependence. In this paper, we proposed an improved chase approach in the special background of application for the data exchange. Solving the problem that finding the most approximately solution in polynomial time for data exchange problem by amending the dependence condition appropriately.