Applied Mechanics and Materials Vol. 197

Abstract: With the continuous development of network technology, the proliferation of spam has become a more horrible threat to normal e-mail service than ever before. Although current spam filtration technologies may block some obvious spams, they still fail to recognize large numbers of tricky ones. Therefore, we propose a novel hierarchical spam filtering method called CFBG grounded on Graylisting and use three layers of well-connected modified filtration technologies to fill up those disadvantages of past filtration technologies. The conclusive result of our experiments shows that the new method can provide more powerful filtration and less misjudgment rate reliably.

Abstract: In the target tracking algorithm, the target representation has an important impact on the target tracking performance. The previous target tracking algorithm using color model to represent the target, it can not achieve effective tracking when the target and background are in similar colors. Therefore, an improved target tracking algorithm, embedded the local binary pattern (LBP) texture model successfully, is used for target tracking algorithm. Analysis shows that in complex conditions, texture and color model based target representation have significantly improved tracking performance.

Abstract: Knowledge sharing was the most important way to obtain resources for the nodes in the network organization. The synergy effect generated from knowledge sharing could rich the network organization resources, and it helped maintain competitive in the network organization developing process. This paper analyzed the impact of the knowledge sharing on the nodes, and the factors that affected the knowledge sharing synergy effect. Finally, a synergy effect function was proposed. Through analysis, we got that the nodes in the network organization should actively take participate in knowledge sharing and improve their own synergy learning ability. It could help enhance the communication and reduce the difficulty of knowledge sharing, then improve the overall performance of the network organization.

Abstract: The optical joint transform correlator (JTC) has been used in target real-time recognition, but the interference of complex background has always been the difficult problem for recognition system, which limits its further development and application. In this paper the principle and experimental system of JTC are introduced. The interference of complex background is simulated and the optimization method is proposed to process the joint power spectrum to eliminate zero-order correlation peak. The analysis result shows that the method of power subtraction can enhance the output peaks and improve the recognition efficiency, particularly for target identification in complex background.

Abstract: In this paper, the study object is a vibrating screen driven by two motors. A new analytical method is proposed to study the dynamic feature of the screen. With introduction of two small variable parameters to average angular velocity of two exciters and their phase difference, the parameters of the model were dimensionless processed, and then the synchronization condition and stability condition of the vibrating screen were deduced. Computer simulation results based on synchronization condition and stability condition show that the vibrating screen realizes speed synchronization and phase synchronization, the system is in a good self-synchronous state.

Abstract: Fatigue life estimation of notched components is mostly dependent on notch stress and strain calculation with non-linear finite element analysis (FEA). For multiaxial cyclic loading, the stress-strain analysis of notch root is rather complex and the non-linear FEA is also very time-consuming. In this paper, a new fatigue life prediction method for notched components under multiaxial loading is proposed. First, a linear elastic solution needs to be solved for notched components under multiaxial cyclic loading. Then, an elastic equivalent parameter is computed using the linear elastic solution. On the basis of the elastic equivalent parameter combined with the Neuber’s rule, an elastic-plastic equivalent parameter is obtained. Finally, the elastic-plastic equivalent parameter is used to estimate fatigue crack initiation life of notched components. The proposed method needs only elastically calculated notch strain history as the basic input and is convenient for engineering application. The method is verified with experimental data of SAE 1045 notched shaft specimens under proportional and non-proportional loading. The results showed that the method can provide good life estimates.

Abstract: To solve the inherent safety problem puzzling the coal mining industry, analyzing the characteristic and the application of distributed interactive simulation based on high level architecture (DIS/HLA), a new method is proposed for developing coal mining industry inherent safety distributed interactive simulation adopting HLA technology. Researching the function and structure of the system, a simple coal mining industry inherent safety is modeled with HLA, the FOM and SOM are developed, and the math models are suggested. The results of the instance research show that HLA plays an important role in developing distributed interactive simulation of complicated distributed system and the method is valid to solve the problem puzzling coal mining industry. To the coal mining industry, the conclusions show that the simulation system with HLA plays an important role to identify the source of hazard, to make the measure for accident, and to improve the level of management.

Abstract: This paper presents a layered two-phase message passing (L-TPMP) decoding algorithm for general quasi-cyclic low-density parity-check (QC-LDPC) codes, which not only achieves high hardware utilization efficiency (HUE), but also brings in great memory block reduction. The main idea is to split the check matrix into several layers row-wise, then to perform the message passing computations sequentially layer by layer and the two-phase computations of different layers can be overlapped performed. There is no constraint to layer the check matrix hence L-TPMP decoding can be used in both high and low throughput applications for any QC-LDPC codes. The overall architecture of L-TPMP decoder is also discussed and an efficient memory arrangement scheme is proposed to reduce the memory blocks. For the (3048, 7493) LDPC code selected form Chinese DTTB, L-TPMP decoding saves over 85% memory blocks comparing with the conventional TPMP decoding, and the HUE of the L-TPMP decoder is 0.97.

Abstract: In this paper we present the research and implementation of TRFD, a Trusted Removable USB Flash Device which can resist various attacks. TRFD is an independent system which would authenticate the user and host before data access. All the data secure processing of TRFD, such as encrypting, signing, are performed inside the device, so TRFD can protect the data against host hacking. The evaluation of our prototype shows that TRFD can solve some security issues of removable storages indeed.

Abstract: Recently, the experimental data displayed that the small RNA played the important role in the gene regulatory network, furthermore , the noises and delay are ubiquitous in the nature and play the important role, so we should investigated the small RNA network with noises and delay and study the dynamical behaviors. In this paper, we studied the nonlinear dynamics of the model by using the theory of nonlinear dynamical system and obtained some results as follows: (1) the system against the small noise is robust;(2) the small noises have the impact on the amplitudes;(3) the large amplitude noises have the significant effect on the cycle in the system. These theoretical results can help us understand the process of gene regulatory.