Applied Mechanics and Materials Vols. 135-136

Abstract: It first reviews the characteristic of manufacturing enterprises. Then it discusses the features and advantages of .Net smart client technology. Based on analysis of the manufacturing enterprises information system requirements, a new application framework of multi-tier distributed system was proposed, the framework model and tier deployment strategy are also given. The proposed framework is easy to be deployed and expanded, it also can be intelligent installation and update, and supports occasionally connected users，and easy to be reused by information system. Next, it introduces a method of how to design and build smart client application use Microsoft Application Block; it can simplify the coding efficiently. Last, the key technologies are demonstrated.

Abstract: Circulating Fluidized Bed Boiler is a complicated control object with big delay, multi-variable and strong coupling, especially the combustion in it. It is too difficult to build an exact mathematic model to describe the combustion process. And it is hard to get ideal control effect with normal controller. This paper presents the overview of advanced control techniques in thermal process control of Circulating Fluidized Bed Boiler, such as decoupling control, predictive control and fuzzy control. The future of advanced control research and application is also discussed.

Abstract: As the uncertainty of parameters and the random nature of disturbances that effect a ship’s course，one of the methods which can be used for designing a nonlinear ship course controller is the neural intelligent method. It is used here for designing a configuration of a nonlinear controller, which are then applied to ship course control. In the paper, we used fuzzy logic and neural network based on T-S model to design the controller. During the control design process, the structure of ship automatic steering and fuzzy neural network feedback controller were built. In order to enhance adaptive characteristics of the controller，the parameters of the network were optimized by a GA algorithm. The proposed course keeping method was tested in a simulation study involving a non-linear model of a ship. Simulation results show that the performance of the ship controller is valuable and easy to implement.

Abstract: Signature schemes with message recovery based on self-certified public keys can reduce the amount of communications and computations, since the signature verification, the public key authentication and the message recovery are simultaneously carried out in a single logical step. Integrating self-certified public-key systems and the message recovery signature schemes, in 2009, Wu et al. proposed two multi-proxy signatures based on the discrete logarithms over a finite field and the elliptic curve discrete logarithms. The proxy warrant revision attacks are proposed, and it will show that Wu et al.’s schemes can not resist the proxy warrant revision attacks by either the proxy group or the original signer.

Abstract: Software testing is an important technique that used to assure the quality of Web application. Test case automated generation is a crucial aspect of Web Service testing. Test case automated generation for Web Service includes test date and operation sequence generation. To resolve the problem that operation sequence couldn’t be generated automatically, this paper presents a new method. Firstly, a directed graph which used to express the relationship among the operations of Web Service is constructed, and then an operation sequences generation algorithm base on the directed graph is proposed. The redundancy of operation sequences is checked in this algorithm in order to avoid redundant test cases generation. A case study shows that the method is feasible.

Abstract: This paper studies the CGF behavior modeling method in Agent-based TBM combat simulation system, which focuses on the decision-making behavior and combat behavior of CGF Agent. Agent entities are divided into three levels, and a three-level organizational structure of Agent has been established. To reflect the relationship between attack and defense, we establish a BDI model based on rival model to track the status of rival Agent and do real-time response. Finally gives the realization method of TBM combat simulation system.

Abstract: A new blind beamforming algorithm for separating and estimating coherent signals arriving at an antenna array is proposed in this paper. This algorithm is implemented through arranging the received data’s correlation function of each array element and reference array element (the first array element), to form the Hermitian Toeplitz matrix first. Then through the singular value decomposition of the matrix the signal subspace and noise subspace can be get, in order to achieve the direction vector of coherent sources to beamform, which can separate the independent signals from different directions effectively without knowing the transcendent knowledge of the signals. The new approach can estimate the coherent signals’ direction-of-arrival(DOA) on the basis of separation, and has good performance under the low SNR. The simulation results show that the proposed method is effective．

Abstract: According to pseudo noise communication and related characteristics of pseudo-random code, this paper proposed a blind source separation method. The method can separate the different pseudo-code sequence from the pseudo-code wide frequency signal. The method can quickly and accurately isolate and identify the pseudo–code feature of different user, to get the user’s voice or data information, which has good application prospects.

Abstract: A novel system of implementing target identification with hyperspectral imaging system based on acousto-optic tunable filter (AOTF) was proposed. The system consists of lens, AOTF, AOTF driver, CCD and image collection installation. Owing to the high spatial and spectral resolution, the system can operate in the spectral range from visible light to near infrared band. An experiment of detecting and recognizing of two different kinds of camouflage armets from background was presented. When the characteristic spectral wave bands are 680nm and 750nm, the two camouflage armets exhibit different spectral characteristic. The target camouflage armets in the hyperspectral images are distinct from background and the contrast of armets and background is increased. The image fusion, target segmentation and pick-up of those images with especial spectral characteristics were realized by the Hyperspectral Imaging System. The 600nm, 680nm, and 750nm images were processed by the Pseudo color fusion algorithm, thus the camouflage armets are more easily observed by naked eyes. Experimental results confirm that AOTF hyperspectral imaging system can acquire image of high contrast, and has the ability of detecting and identification camouflage objects.

Abstract: Carbon dioxide (CO2) gas sensor using surface acoustic wave (SAW) device based on Zinc oxide (ZnO) was developed and fabricated in this paper. The center frequency of SAW device is 203.528 MHz. The input and two output interdigital transducers (IDT) apodized by Morlet wavelet function can improve the side lobe rejection compared with uniform IDT. The ZnO film sensitive to CO2 gas was fabricated in measurement acoustic track of SAW device. Experiments results confirm that the CO2 gas sensor using SAW device based on ZnO film has good response characteristics to different concentrations CO2 gas. Furthermore, the CO2 gas sensor using SAW device based on ZnO film has good stability and linearity.