Advanced Materials Research Vols. 219-220

Abstract: Based on detailed analysis of the risk of bulk chemical tanker transportation, a societal risk acceptance criterion is established. The criterion takes advantage of formal safety assessment (FSA) methodology, which is widely used to analyze risk in maritime industry. In the end of this paper, the negligible range, the ALARP range and the intolerable range of bulk chemical tanker in China are estimated in the criterion.

Abstract: A new photovoltaic solar cell charging system with fuzzy logic control is proposed and designed. This kind of solar energy storage system is composed of a solar cell, a charger, batteries, a buck converter and a digital signal processor. It mainly applies a low-voltage level translator to control the pulse charging current of a lead-acid battery and also combines the fuzzy control method to improve the charging efficiency, suppress the abnormal temperature rise in the battery, lengthen the battery life-time, reduce the additional waste, etc..Experimental and simulated results are shown to demonstrate and compare the validity of the system and verify the effectiveness with each other.

Abstract: Base on researching the source and development of fault tolerance theory, this paper discusses the working mechanism of fault tolerance, and illustrates the workflow and dependability of fault tolerance. So there is a widespread belief that this is feasible that fault tolerance theory is used in the traffic safety study. Through summarizing the progress of the fault-tolerant study in road traffic field at home and abroad, the paper gets some enlightenment from these literatures, finally gives the prospect of fault-tolerant theory which is used in the road traffic safety research.

Abstract: Some factors affect the driving behavior seriously, for example driving visibility, velocity, headway, driver’s vision and psychology&physiology etc. This paper, base on analyzing visibility under different conditions, analyzed the influence to driving visibility in ice & snow environment, and studied driver’s vision and psychology&physiology in the same environment through experimentation. So studying on driver’s comprehension effectiveness of traffic signs under the ice and snow condition and establishing the model, this is in favor of providing the theory evidence for installing traffic signs considering the effect from ice and snow in the long period of ice and snow season northeast area, in china.

Abstract: Redundant parallel robots have been under increasing developments from a theoretical view point as well as for practical applications. Compared with the traditional parallel manipulators, they have such merits of more load, faster speed and higher accuracy. The method about how to build up redundant actuation parallel robot is introduced. Considering that the kinematic joint and limb are basic elements to constitute a proper parallel robot mechanism, special Plücker coordinates is adopted to describe the displacements of the output link of a limb or the robot mechanism. Then the principle for design of the redundant actuation parallel robot mechanisms is presented and example of the 2RRR&2PP parallel robot mechanism is brought forth and analyzed by this method.

Abstract: Boundary control of two-dimensional wave equation on the rectangle is considered in this paper. Boundary controllers are designed through backstepping method. Stabilization of the closed system is obtained under the controllers.

Abstract: In this paper, we investigated the problem of spectrum sensing to identify primary users in cognitive radio networks. And then we proposed a sequential spectrum sensing scheme based on distance vector. A reliable factor was introduced into the sequential spectrum sensing scheme. This factor was related to distance and could determine the reliability of individual local decision. Simulation results show that the proposed spectrum sensing scheme can provide better performance, and the probability of sensing error can be reduced to 3% compared to the SPRT scheme.

Abstract: Wireless sensor networks (WSNs) detect and monitor the outside physical state by the sensor nodes organizing automatically. Routing protocol is one of most important parts research contents of WSNs. This paper analyses and compares routing protocols of wireless sensor networks with other networks, and summarizes characteristics and the appropriate application by studying recent routing protocols for sensor networks. Finally, the important features and the future trends of routing protocols possess are putted forward.

Abstract: This paper utilizes ARM 9 series chips such as S3C2440 as the CPU to realize an embedded Linux system. Due to the integration of NAND Flash in S3C2440, it is easy to connect the NAND Flash external devices in the perspective of hardware. After that, the system combines the serial ports which intend to load and debug the driver of NAND Flash, realizing the loading and uninstalling of NAND Flash storage modules. The innovative design and realization is a basic for the implementation of YAFFS file system in the Linux terminals.

Abstract: The constructivist learning based on data mining technology is a senior learning process, it realized the discovery to the unknown knowledge, it reflected knowledge construction goal that constructivism pursue. In this paper, we first briefly introduced the data mining technology and constructivist learning, analyzed the necessity of the application of data mining technology on constructivist learning, and then put forward the viewpoint of the combination between them, finally, we discussed how to implement the data mining in constructivist learning.