Advanced Materials Research Vols. 433-440

Abstract: According to the grey system theory and markov principle, the fitting accuracy index is stochastic and fluctuant when time series datadevelopment trend is fitted through the grey theory; but the markov principle is suitable for processing the system with great stochastic fluctuation; therefore, a forecast model is put forward which is in accordance with the characteristics of construction accidents’ statistical data and is based on the grey system theory and markov principle. The model is suitable for the dynamic forecasting process featured by short forecasting time, small data quality and great stochastic fluctuation. The conclusion about the development trend of construction accidents with the model based on the grey-markov theory is more ideal compared with the grey model. The application example shows that the forecasting conclusion based on grey-markov theory is more accurate and more reliable. So the model is available enough to forecast the construction accidents.

Abstract: In this paper, we study on the problem of how to combine feature selection models in text classification ,and present a method through build the hybrid model for feature selection ,this hybrid model combined with advantage of four feature selection models (DF,MI, IG, CHI), then we use the Naive Bayes model as classifier to verify the effect of the hybrid feature selelction model ,and experiments shows that the hybrid model is correct and effective and get good performance in text classification.

Abstract: Continuous Multi-channel digital audio signals system not only guarantees the continuity of signal acquisition, but has the real-time control ability in the process of signal acquisition. This paper proposes the producer/consumer design pattern which can make program designing quicker, simpler and more efficient. Through the example of continuous sound signal acquisition, the designing idea for the Producer/consumer design pattern is described in details and the design process of this program on the Delphi platform is given. The result shows that the introduction of the producer/consumer design pattern in the use of program design which has serious request in real-time and continuous sound signal acquisition and playing can make the processes response faster and more efficient．

Abstract: Parallel computing has been applied in many fields, and the parallel computing platform system, PC cluster based on MPI (Message Passing Interface) library under Linux operating system is a cost-effectiveness approach to parallel compute. In this paper, the key algorithm of parallel program of explosion and impact is presented. The techniques of solving data dependence and realizing communication between subdomain are proposed. From the test of program, the portability of MMIC-3D parallel program is satisfied, and compared with the single computer, PC cluster can improve the calculation speed and enlarge the scale greatly.

Abstract: Risk analysis is important to increase the reliability of engineering system. And an excellent model is the foundation. Traditional models are event-oriented so that it can’t describe the totality of the system. This paper introduces a function-oriented modeling approach-Goal Tree Success Tree and Master Logic Diagram. It provides a powerful functional/structural description and modeling method. It can represent the goals, the functions, the components and their interactions of the engineering system. So, it is a systemic modeling method for the risk analysis of engineering system. A case study of the servo mechanism of the launch vehicle shows that this approach can identify the key risk factors and the hidden risk factors. And it can trace the failure influence. It provides a systemic approach to risk analysis for researchers

Abstract: Wireless temperature and humidity acquisition system is designed in this paper using PT100 thermal resistances and HS1101 sensors. The system is composed of thermal resistances using C8051f330 microcontroller with two-wire resistance measurement circuits, HS1101 frequency output circuits, 2.4 GHz ISM band RF transceiver chips nRF24L01 with multi-point sending and receiving, combination of wireless communication receiver modules CY7C68013. System uses the USB2.0 send temperature and humidity data to the PC, and display the curves of LabWindows / CVI real-time temperature and humidity.

Abstract: In this paper, a new method is to design the digital manometer by using the BPR-2/100 manometer as the measuring of pressure, using single-Chip microcomputer as AD, and using the LED to display. It mainly includes the hardware circuit and software. It can accord with international unit at the present time and meet the needs of digital time because of high precision.

Abstract: A management method of scheduling the parking spaces in adjacent parking lot uniformly has been proposed to solve the growing problem of parking pressure caused by the increasing number of motor vehicles in cities. This method uses GSM network to collect the parking space’s status in adjacent parking lots, receives SMS or web query from owners, and shows the messages of each parking lot to them. Users could avoid the busy parking lots to parking their cars in the free parking lots relatively due to the query information, and can also obtain the right of parking spaces by appointment. The rock-bottom detection of each slave node by master node via RS485, Mater nodes transfer the detection messages to management system via GSM. The result shows this design could make use of existing parking resources. It is a good way to solve the problem of ‘Parking hard’.

Abstract: This paper introduces ¡_p-¡_q detection and analyzes the error in detecting the active and reactive current theoretically at the condition of three-phase and four-line at first. Then, it puts forward a new method at the base of ¡_p-¡_q detection. At last, on the base of MATLAB, the simulation of the new method is demonstrated to be correct and acceptable.

Abstract: The main idea behind this paper is the use of cheap one-level pointer analysis information to achieve better results in the context of dependency-based program debugging. We model java programs by a points-to graph with annotations in the form of constraints, derive the inner logical representation deriving from this model, and use them to debug faults in input programs. Our analysis and the empirical results show that we can achieve better results in the context of dependency-based software debugging.