Advanced Materials Research Vols. 998-999

Abstract: Bell-LaPadula model (BLP) model is the most classical multilevel computer security model. Based on the research of BLP model, this paper analyzes the main defects in BLP model and different improving methods, puts forward a principle or “read the nearest and write the nearest”, improves the BLP model more effective security and integrity.

Abstract: The parameters of the On-off shift solenoid valve are analyzed by finite element analysis software Ansoft and orthogonal experiment design. What’s more, the design parameters of the on-off shift solenoid valve can be optimized by analysis of the data of the orthogonal table. The result shows that the voltage influences the electromagnetic force the most, the air gap comes second and the number of turns is the minimum. We find that the force increases with the growth of voltage and the number of turns, but it is opposite to the air gap.

Abstract: In this paper, we develop an automatic system which could help us to select or evaluate the most suitable target from a variety of candidates. Above all, we carry out an analytic hierarchy process including 3 levels with different factors. After combing with fuzzy comprehensive evaluation, we rank the candidates with final scores. More specifically, taking the selection of the best coaches of football in American universities as an example, a hierarchical structure it built, with coaches’ comprehensive capacity being the target level, their technical skills, competition records, and personal influence being criteria level, coaching experience, teams’ improvement factors, win-loss percentage, participation in highly-demanding competitions and awards of coaches being the corresponding index level. Then, we use cluster analysis to determine threshold of each index, and combine trapezoidal distribution function with fuzzy comprehensive evaluation to obtain the membership degree of the following five sectors: fully equipped, equipped, basically equipped, poorly equipped, not at all equipped. After scoring each coach, we obtain the final rank

Abstract: Requirements Traceability has a very important role in the entire application development lifecycle. As for the problem of manual creating requirement traceability relationship time-consuming and error-prone effort problem, this paper proposed a new component-based dynamic requirement traceability model. The model incorporates the requirements specification model and component functionality tree model to format requirements documents and component library. Establish requirements traceability relationships through mutual matching between component facet functional items and requirement documents. Validate requirements traceability feasibility and efficiency through multiple systems and component requirements documents, the experimental results provided by the implemented system show that the model is valid, and efficiency and accuracy have been improved to some extent compared with the conventional information retrieval model.

Abstract: To meet the demand for aerospace applications, high-speed computing transcendental functions such as trigonometric functions, we design a high-speed full-parallel CORDIC processor. On this basis,combining the optimized algorithm of simplifing pathway and adding-bits high-precision method , the original design has been improved. The experimental results show that improved design reduces hardware overhead compared to adding-bits high-precision design,and improves accuracy compared to fully parallel design. This high-speed fixed-point CORDIC has high precision and is suitable for high-speed applications in computing trigonometric and inverse trigonometric functions.

Abstract: In order to save manpower, improve the quality of productions and the efficiency of productions, the double-stuffed bag machine is developed. After a lot of experiments and analysis, the way of double-stuffed is put forward and the Omron PLC is adopted as the main controller, and Omron HMI is adopt as the display device. According to the requirements of technology the number of PLC is chose, its extension is chose, the software about the control system is wrote. The efficiency of the double-stuffed bag machine reach 25 bags/minute. The efficiency of the device is greatly improved and can reach the domestic advanced level. The design scheme of double-stuffed bag improves the speed of the Cypriot bags, ensures the quality of the product, reduces the difficulty of the operation, and that has a good market prospect.

Abstract: In this paper, a method of direct torque control (DTC) for permanent magnet synchronous motor (PMSM) based on fuzzy regulator is proposed. It overcomes the disadvantages such as speed drop with load, torque ripple etc., which happens in the DTC for PMSM based on conventional PI regulator. The simulation results show that, the DTC for PMSM based on fuzzy regulator can effectively improve the system loading capability and significantly reduce the torque ripple and the harmonic content of the system. Therefore, it can comprehensively improve the system performance.

Abstract: The flow field was simulated in a 2D convergent-divergent nozzle, for fluidic thrust vectoring with N-S method. Based on the specific design, the effects of control parameters of secondary jet injection is investigated, and a method is proposed to calculate the initial state of secondary jet, which is different from original hypothesis of stagnation. The results showed that the two methods have closed results and the stagnation hypothesis is suitable for the calculation of the initial state of secondary jet.

Abstract: For nonlinear gas engine control system, uncertainty and complexity, this paper proposed electrical control design using artificial neural networks to improve the performance of electric and gas engines.

Abstract: With the road traffic congestion problems become more and more serious, and the current traffic lights don’t possess the function of revising timely and flexible, it can't meet the requirements of real-time controlling and make the traffic in intersection more efficient. The design of Microcontroller-based traffic signal controller fixes this problem. It based on STC90C51 as CPU solutions; LED lights and digital pipe were used as display module; 8 independent keyboards were used as the only manual input device; Software used the C programming language. The intelligent traffic light system covered the multi-phase and multi-period. So we could choose two-phase/four-phase/six-phase according to the particular road and traffic condition. Besides, it took the special status of emergency vehicles into account. It also had a manual input keyboard so that you could adjust the signal at any time. This design can effectively improve the traffic congestion problem.