Advanced Materials Research Vols. 219-220

Abstract: Web usage mining technique is widely used for Web recommendation, which customizes Web content to user-preferred style. Traditional techniques of Web usage mining can only discover usage pattern explicitly. In order to employ the users’ feature and web pages’ attributes to get more accuracy recommendation, we propose a unified collaborative filtering model for web recommendation which combined the latent and external features of users and web page through back propagation neural networks. In the algorithm, we employ Probabilistic Latent Semantic Analysis (PLSA) method to get latent features. The main advantages of this technique over standard memory-based methods are the higher accuracy, constant time prediction, and an explicit and compact model representation. The preliminary experimental evaluation shows that substantial improvements in accuracy over existing methods can be obtained.

Abstract: Barcode technology is one of the automatic identification technologies that are developed and used very rapidly in recent years. As the application and popularization of wireless communication and mobile device technology, the 2D (two dimensional) barcode technology has been used in preliminary in social production, e-commerce and commercial activities. In this paper, the different applications of 2D barcode in hospital informatization are studied, 2D barcode-based informatization methods are presented, and the tier framework of hospital information system is established. The system structure is divided into three tiers according to the principles of system access and realization. By using the barcode-based informatization method in multiple links of hospital business, the data input efficiency will be greatly improved and the information processing time will be shorten in great deal, so the service level of the hospital is improved.

Abstract: Although the results on exponential stability of delayed bidirectional associative memory (BAM) neural networks with impulse or diffusion were reported by some researchers, impulsive and diffusive effects should simultaneously be taken account into consideration since diffusion and impulses are ubiquitous in both nature and manmade systems, which reflects a more realistic dynamics than the former results. By using the impulsive delay differential inequality, some new sufficient criteria on exponential stability are established. Our criteria are independent of diffusion effects and dependent on the magnitude of the delays and impulses, which shows that diffusion effects are harmless and the magnitude of the delays and impulses needs enough small in the stabilization.

Abstract: A kind of wireless monitoring interface device based on wireless sensor networks for ammeters was proposed. Ammeters connected by UART or pulse interface to get ammeters’ real-time data. Then, an ammeter monitoring system based on wireless sensor networks (AMSBW) was designed. The system consist building-WSN and community wireless monitoring center. And user’s ammeters, ammeter wireless monitoring interface devices and building-sink nodes were included in the building-WSN; the center sink node and monitoring host were contained in community monitoring center. The functions of real-time monitoring, remote control and preventing electricity-stolen were designed in the AMSBW which had simple installation and configuration. Then a software system to test the AMSBW was exploited. At last, system’s tests results show that it could effectively achieve the goal of real-time monitoring and control ammeter.

Abstract: The fuzzy clustering method is used to divide the data of calciner in this paper, and the method of fuzzy association rules is applied to get the control rules of calciner. Firstly, the fuzzy cluster and association algorithm are discussed,, later the hybrid algorithm KFCM is utilized to calculate the real data from the calciner to get the membership of each data, and MFAR method is used to obtain effective fuzzy association rules. The way put forward in this paper can solve the bottlenecks of expert experience, and can provide theoretical basis for the control of calciner.

Abstract: The bearing ability of thyristor to over-voltage and over-current is poor. According to the causes lead to over-voltage and over-current , adopting over-voltage protection such as RC snubber, vristor, and so on, and limiting reactors, current sensing devices, fast fuses, etc. are used in fast over-current protection.

Abstract: This paper proposed the solution of visualization technology in virtual spinal fixation surgery system, which implemented the 2D image display and 3D bone tissue refactoring. It is designed based on Visualization Toolkit and implemented by the improved RayCasting volume rendering algorithm. First, design the uniform interface for 2D and 3D visualization, and then give 2D slicing visualization pipeline and spine 3D refactoring pipeline. In spine 3D refactoring, the system dynamically chose appropriate rendering algorithm to satisfy the real-time requirement of the system interaction based on GPU or CPU computer hardware environment. Meanwhile, provide visualization windows with visualization pipeline adjustment panel to adjust visualization effect conviniently. By 2D slicing data visualization we can transform CT value into 2D grayscale image and display it. The refactoring algorithm of 3D bone tissue refactors CT visualization data into 3D bone model. By defining the resampling coordinates in 3D refactoring window, the system provides re-slicing of axial section view, sagittal section view and coronary section view.

Abstract: This paper proposed the solution of haptic feedback interaction, which can be used for 3D interaction in Virtual Spinal Fixation Surgery System. We frist introduced the traditional Proxy-based Volume Haptics solution, and then proposed the Haptic feedback primitive based on it. There are four Haptic feedback primitive: point, line, plane and direct force. The haptic feedback system developing model is composed by Haptic Rendering and Graphics Rendering. The paper designed interface and classes based on this model, and then implemented the haptic feedback system at last. With this system, we can feel the load carring condition, speed up the virtual operation and provide data analysis more accurately.

Abstract: In recent years the processing of composite event queries over data streams has attracted a lot of research attention. Traditional database techniques were not designed for stream processing system. Furthermore, example continuous queries are often formulated in declarative query language without specifying the semantics. To overcome these deficiencies, this article presents the design, implementation, and evaluation of a system that executes data streams with semantic information. Then, a set of optimization techniques are proposed for handling query. So, our approach not only makes it possible to express queries with a sound semantics, but also provides a solid foundation for query optimization. Experiment results show that our approach is effective and efficient for data streams and domain knowledge.

Abstract: There are often some efficiency losses between user equilibrium (UE) and system optimization (SO). This paper investigates the efficiency losses of multiclass stochastic user equilibrium (SUE) traffic assignment under congestioin pricing against SO. Serveral bounds of the efficiency loss for this problem when the tolls are considered as part of the system cost are derived, with the time-based criterion and the monetary-based criterion, respectively. It is shown that the upper bound of efficiency loss caused by the time-based SUE depends on the type of link travel time function, the network complexity, the travel demand, and the degree of users’ perception error on travel cost. The upper bound of efficiency loss caused by the monetary-based SUE depends on the value of time (VOT) of user classes besides the aforementioned factors.