Advanced Materials Research Vols. 268-270

Abstract: Two experimentally feasible schemes are proposed for generating multipartite entangled states of cold trapped ions. In the first scheme, a Greenberger-Horne-Zeilinger state can be simply synthesized in a single step, in view of decoherence mechanism, a reduction of the number of operations for the state preparation is crucial. What’s more, only one laser beam is required in our scheme. The second scheme is to prepare canonical (fully symmetric) W states by two steps. However, in the paper [HÄaner H, HÄansel W, Roos C F, et al. Nature, 2005, 438:643-646.] M steps were required for generating the same W states.

Abstract: Traditional three dimensional system data structure such as tree and linked list does not fit the huge data organization and management. In this paper, we introduced advantage of scene graph data structure in three dimension data management and presented a scene graph based data structure to improve the management and rendering efficiency. To assure high performance in a usual PC machine, we designed a multi-thread structure to respectively handing data reading, merging and rendering. From the experiment, we proved the capability of the multi-thread rendering system in different level of data size.

Abstract: Vanishing point detection is a basic work in camera self-calibration, single view reconstruction and series of images matching. Our research is based on line segments clustering method. First, we scan the image with edge detection algorithm for series of line segments. Then, we construct a similar concept space to classify the segments according to the vector distances. At last, we can use each cluster of the line segments to estimate the responsible vanishing point. For the clusters of the line segments indicate the main direction in multiple lines, the detected vanishing points are principal direction points. From the experiments, we approve our algorithm can acquire accurate position of vanishing points in short time.

Abstract: Quick Response has become a major strategy to bring competitiveness and has been widely implemented in logistics field. In order to evaluate logistics quick response capability for a logistics firm in a correct way, this paper introduces the process of constructing a quick response capability assessment index system based on a reasonably proposed assessment index framework after analyzing empirical data collected from experts and professionals in logistics field. Based on further reliability analysis, factor analysis, and validity analysis being conducted on the collected questionnaires, this paper formed a logistics quick response capability assessment index system, a 2-level hierarchy structure, composed of 7 secondary indexes and 41 tertiary indexes. The assessment system can be applied to evaluate quick response capability for logistics firms in Guangxi, China.

Abstract: To obtain overlay network traffic and delay information between two hosts is important for network management, monitoring, design, planning and assessment. Traffic matrix and delay matrix represent the traffic and delay information between two hosts, so introduce the concept of the overlay network traffic matrix and delay matrix. Compressive sensing theory restores traffic matrix and delay matrix but is not suitable for overlay network. This paper improves compressive sensing algorithm to make it more applicable to overlay network traffic matrix and delay matrix restoration. After calculating the traffic matrix and delay matrix this paper quantifies overlay network congestion, which reflect the current network security situation. The experimental results show the restoration effect of traffic matrix and delay matrix is well and the congestion degree reflects the actual network state.

Abstract: The application of fieldbus has been limited due to the high cost of hardware and the difficulty in interfacing with multivendor products. In order to solve these problems, the computer network technology, especially Ethernet, is being adopted by the industrial automation field. The key technical obstacle for Ethernet for industrial applications is that its nondeterministic behavior makes it inadequate for real-time applications, where the frames containing real-time information, such as control command and alarm signal, have to be delivered within a certain time limit. Recently, the development of switched Ethernet shows a very promising prospect for industrial applications due to the elimination of uncertainties in the network operation that leads to the dramatically improved performance. We propose a trust evaluation model for industrial control ethernet network . Our study shows the importance and necessity of applying theoretical analyses to understand the complex characteristics of trusted industrial control ethernet networks.

Abstract: The impacts of self-similar traffic on network performance has received much attention recently, however the effects of control network on self-similar traffic networks has not been fully investigated yet. Therefore, the objective of this paper is to to understand self-similarity on physical grounds in a realistic network environment. This understanding is important when developing efficient and integrated network frameworks within which end-to-end QoS guarantees are fully supported. We first introduce the techniques that we use to generate self-similar network traffic .Then we compare the performance of an Ethernet segment run with heavy-tail traffic and with exponential traffic. Our study results show that self-similar traffic, compared with traditional short-range dependent models, requires longer queues and thus larger buffers in the control network design.

Abstract: With the popularity of computer and network among adolescent, the influences of web on adolescents aroused the attention of society and educators. Network creates another world of interpersonal interaction for adolescents. Web brought the convenience for adolescents’ interaction, but it might also lead to negative effects on the development of adolescents. Based on the conception of network interaction, the current paper explored the modes of network interaction, including instant communication, e-mail, bulletin board system (BBS), blog and social networking services (SNS). Then the features of network interaction were discussed, that is, virtuality, openness, weak ties, and equality. At last, the influences of network interaction on adolescents were analyzed, including self-expression, self-disclosure and real ego.

Abstract: In this research, an approach is described that emphasized using visualization to teach synthetically experiment course. This research discusses the multi-lessons and synthetically education, the way the visualization experiment course overcome the difficulties in organizing teaching contents is used true research items stemmed from teachers. This approach includes allowing the students to select their own choice of accomplishing circuit board manufacture, teaching all signal collection, data acquisition, signal process with the help of conceptual visualization based on Matlab, making the students to come up with hand drawn mathematical result before they start simulation, motivating student searching for new algorithms leading to the creation of the system.

Abstract: This paper presented an innovative approach to implement physics experiment by remote measurement system. In the experiment of magnetic field distribution in the solenoid, a two channel programmable current source was adopted, one channel of the programmable current source was used to incentive the solenoid to produce magnetic field and the other was used for the Hall probe to generate Hall voltage. The Hall probe was controlled by a step motor to different positions of the solenoid. The Hall voltage and the position curve were obtained by the measurement system showed the magnetic field distribution of the solenoid. The entire experiment was done via the internet to realize the remote experiment.