Applied Mechanics and Materials Vols. 34-35

Abstract: A number of different buyer-seller watermarking protocols have been proposed to address preserving the rights of both the buyer and the seller. However, these existing schemes are inefficient and impractical for their high computation and bandwidth overhead. To this end, we propose a new buyer-seller watermarking protocol, where the multimedia data is encrypted using a symmetric cipher, and the public-key cipher is only used to key exchanging and data signing. Compared with the existing schemes, our scheme requires a lower computing power and communication bandwidth. In addition, some main drawbacks of those previous schemes are overcome in our scheme.

Abstract: In this paper, the three dimensional geometrical analysis is depicted with the interacting relations among cutting edge, undeformed chip and shear zone along cutting direction, and a general geometrical model of five-axis machining curve surface in ball-end milling is presented. A general force model is derived, and the three dimensional cutting forces are predicted. The influences of different angle of the centerline of the cutter to the cutting forces are considered. The three dimensional cutting forces are applied to construct and analysis the structural vibratory model of the system.

Abstract: I2S (Inter-IC Sound Bus) is one of the general audio buses applied in various industrial or embedded systems. It only processes the audio data, while other signals like various codes and control signals are transmitted individually. This paper presents an approach how to construct an embedded audio system using the I2S bus to connect relevant supporting code chip and decode chip. This system can reduce the consumption of system resources drastically, therefore fluent WAV broadcast can be guaranteed. Moreover, the familiar media files, such as MPEG1, MPEG2, MP3, MPEG4 can be played through adding its decoder. The ARM chipset of the LPC2300 series is applied in this system, therefore, system’s reliability can be improved. This method can be wiedly used in vehicle- borne, ship-borne embedded flash players and portable media players.

Abstract: Open networks are always changing and unpredictable. The new trust management mechanisms will be needed in dynamic networks environment to ensure the open networks. A new trust management is proposed in this paper which trust is divided into two layers: network connection trust layer and application trust layer. Network connection trust layer is the foundation. If there is no network connection trust layer, there is no application trust layer. The trust relationship between each peer layer includes the basic trust and experience trust. Experience trust value is evaluated by fuzzy theory and a new connect operator and merge operator is presented to fuzzily evaluate the recommend trust value. Result shows that this trust architecture is suitable to establish trust relationship among principals and make a new secure solution in open network environment.

Abstract: In this paper, the new detection algorithm of scene detection based on mutual information has been presented. Our approach first detect shot boundary using mutual information. Then key frames are selected from different shots. To cluster similar shots into groups, we present a novel clustering method based on mutual information. Experiments on test video indicate that the proposed scene detection method accurately detects most of the scene boundaries while preserving a good tradeoff between recall and precision.

Abstract: Association rule is one of the important models of Web mining. By analyzing the topology of web site, this paper brings forward an efficient genetic simulated annealing association rules method．It applies genetic algorithm，incremental mining technology to trace users access behavior and optimizes association rules，and forecast capable association rules which improves its precision．Finally, this paper gives out the data analysis of experiment and summarizes the characteristics of genetic mining．

Abstract: Since the energy supply of a sensor node is limited, energy optimization should be considered as the key objective when studying the overall network design problem in wireless sensor networks (WSNs). In this paper, we proposed a distributed energy-efficient clustering algorithm in WSNs based on multi-hop theory. We compare the proposed algorithm with different clustering methods used in the WSNs. The simulation results show that the proposed algorithm has the better performances of energy-efficiency, higher throughput and low delay.

Abstract: Grid computing is a new type of network computing platform emerged after the World Wide Web, which objective is to provide a kind of infrastructure that shares all kinds of information for user． This paper brings forward a Grid-P2P model based on Peer-to-Peer computing, and designs a peer-to-peer genetic scheduling algorithm. The simulation results show that this model increased validity and accuracy of grid computing. It can be applied to the optimization of task scheduling successfully.

Abstract: MR elastomers, which consisting of silicone rubber and carbonyl iron particles, are prepared under different magnet fields intensity. Their micro-structure and mechanics properties are investigated and compared. Results show that the bearing capacity and stiffness of both MR elastomers will increase when subjected to a magnet field. But the controllable range and comprehensive properties of the MR elastomers prepared with magnet fields are better than what of the MR elastomers prepared without magnet fields.

Abstract: The transient performance of engines is investigated in this paper. A mathematical model of single-cylinder engines is established and the friction torques produced by crankshaft bearing, piston assembly, pumping loss and other major factors are modeled. A dynamic simulation system is developed based on the MATLAB Simulink environment. Friction torques and instantaneous motion characteristics of the engine are predicted. The results show that crankshaft bearing, piston assembly, and pumping loss have a major effect on the transient performance of the engine, and the models described in this paper provide an effective tool to simulate engine processes.