Advanced Materials Research Vols. 268-270

Abstract: A high accuracy rotation angle estimation algorithm based on Local Upsampling Fourier Transform (LUFT) is developed in this paper. The LUFT uses a hierarchical strategy to estimate the rotation, which consists of a transformation of rotation to translation, a fast coarse rotation estimation and a robust refinement stage as well. The coarse rotation is estimated through the conventional Phase Only Correlation (POC), then, it is refined by the resampling technique within a local neighborhood in frequency domain. Furthermore, as will be shown in many experiments, the LUFT can achieve high accuracy rotation estimation, where the accuracy is tunable to some extent. Specially, it is efficient and robust to noise.

Abstract: A robot monocular localization method based on 4-DOF ego-motion model and RANdom SAmple Consensus (RANSAC) in country road environment is introduced in this paper. The algorithm uses as input only those images provided by a single camera mounted on the roof of the vehicle. Given the image motion, the stable localization of vehicle is computed by the 4-DOF ego-motion model and RANSAC algorithm, which can efficiently estimate the instantaneous steering angle and traveling distance even if the vehicle runs on bumpy road. The proposed algorithms are successfully validated on videos from an automotive platform. Furthermore, the localization results from our method are compared to the ground truth measured with a GPS/INS joint system, and the trajectory recovered from the estimated localization parameters is superimposed onto a digital map. These experimental results indicate that the algorithms are efficient and encouraging.

Abstract: Using the application of bulk data transfer, we investigate the performance of existing TCP-to-SCTP Translation shim scheme under the scenario of shim rules-table is static (i.e., manual). We find that a potential problem named stale shim rules-table value caused by shim rules-table static configuration, which induces TCP-to-SCTP Translation does not startup in time. Based on this, we present a suggestion called Shim Rules-table Dynamic Configuration (SRDC) for TCP-to-SCTP Translation to implement the real-time startup and to improve the throughput of SCTP association by modify original shim rules-table command list, original socket option, original function of connection( ) and sosend( ).

Abstract: Removed due to double publication

Abstract: With the development of IPv6, it is taken as a natural cover to defend against Internet worm due to its huge address space. We demonstrate that an intelligent worm can compromise the IPv6 network according to using adaptive means. Based on the analysis of the scanning strategies in IPv6 network and correlative typical propagation technologies, a general worm model named Next Generation Internet worm model (NGIWM) is established for analyzing the propagation of IPv6 worm which is made up of three layers. The three layers have the function to accelerate the spread of NGIWM, and make NGIWM has the capability to form large scale of prevalence. The result indicates the rationality of scanning strategies and the effectiveness of the propagation compared to IPv4 network worm. The simulation shows that the implementation of NGIWM has the potential to become a major threat to IPv6 network. The performance of the worm depends heavily on domain name generator algorithm and scanning strategies in local network. We also analyze the effect of experiment parameters on the model in the simulation part. In the future, detailed implementation of the proposed model and more defense mechanisms are to be studied.

Abstract: With reference to discussion of the cultural & creative industries and the network ecosystem, this paper puts forward a cultural & creative industries stereo ecosystem based on SOA, establishes it’s logical architecture and business architecture. It utilizes the advantage of internet, such as information share, interactive, recreational and commercial, to solves the restriction of structure and technology, which exist in traditional cultural and creative industries.

Abstract: Based on discussed the characteristics of highway traffic accidents’ severity and distribution in detail, this paper puts forward a new approach that is use safety management system to improve highway safety, establishes it’s logical architecture, puts emphasis on the advantage of institution, standard, safeguard, supervision and implementation.

Abstract: In order to resolve the problems about providing optimal learning and training and high price caused by frequent computer-assembly, a virtual computer assembly experimental system is built by virtual reality technology. The architecture of virtual computer assembly system is put forward and the prototype for the virtual computer assembly system is built based on virtual reality. Key technologies such as the scene control and rendering of Vega Prime, collision detection in assembling, computer hardware model real-time editing and model positioning are discussed in detail, and the virtual assembly system is applied to practice which is testified feasibly.

Abstract: Matrix ordering is a key technique when applying Cholesky factorization method to solving sparse symmetric positive definite system Ax = b. In view of some known minimal elimination ordering methods, an efficient heuristic approximate minimal elimination ordering scheme is proposed, which has the total running time of O(n+m). It is noteworthy that the algorithm can not only find a good ordering efficiently, but also achieve the result of symbolic factorization simultaneously.

Abstract: This paper describes the characteristics of the impulse noise in the shallow water acoustic channel, and its influence on the bit error rate (BER) performance of the Orthogonal Frequency Division Multiplexing (OFDM) system. The simulation has been carried out to analyze the performance of the joint suppression of impulse noise in time and frequency domain in OFDM underwater acoustic communication system. Data processing of the actual sea trial in Xiamen Harbor shows that the method has some impressive effect on impulse noise in shallow water acoustic OFDM system, and improves the BER performance on different levels.