Key Engineering Materials Vols. 467-469

Abstract: For labeling the T2-weighted MR images using human brain atlas, it is prerequisite to the foundation of the Talairach space for T2W MR images, and the basic condition to found Talairach space is the location of Talairach cortical landmarks from T2W MR images. A method to locate the Talairach cortical landmarks from T2W MR images is proposed, it consists of three aspects: Firstly, determine the planes including the six cortical landmarks ; segment the planes based on fuzzy C-means clustering algorithm, gray level projection, watershed algorithm, region merging, thresholding, and morphologic operations; locate the cortical landmarks from the segmented planes. The algorithm has been validated quantitatively with 20 T2W MR images data sets. The mean errors of the Talairach cortical landmarks were below 1.00 mm. It took about 8 seconds for identifying them on P4 3.0 GHz. This fast, robust algorithm is potentially useful in clinic and for research.

Abstract: According to material mechanics theory and drilling practice, the equation of lateral bending deformation (LBD) of drill was built and the inclined angle of drill tip was solved when drilling small hole. And then the drilling test was done and the character of drilling force was analyzed. Based on this, the LBD of drill was studied. The result shows that, the rise of lateral force and thrust force will increase the inclined angle of drill tip in drilling process, and lateral force is the main factor of generating LBD. By choosing suitable axial vibration parameter, axial vibration drilling can reduce the LBD of drill and improve the dimensional accuracy of hole evidently.

Abstract: Affiliation-hiding authenticated key exchange protocol, also called secret handshake, makes two parties from the same organization realize mutual authentication and key agreement via public key certificates without leaking the organization information to any others. Moreover, if the peer involved in the protocol is not from the same group, no any information of the affiliation can be known. In previous secret handshakes protocols, there is a problem which is linkability. That is to say, two activities of the same people can be associated by the attackers. It is not desirable for privacy because the association may deduce it’s affiliation with some other information. In this paper, an unlinkable affiliation-hiding authenticated key exchange protocol is brought out to conquer the linkability. Security analysis is given finally.

Abstract: To realize the trajectory tracking control for six degrees of freedom parallel robot, a fuzzy sliding mode control strategy based on support vector machines is presented. Sliding mode control algorithm has complete adaptability to system disturbance and siring in sliding mode, which is used to automatically track the uncertainty of system parameters and external disturbance. Fuzzy algorithm is applied to improve the sliding mode control performance. Fuzzy support vector machines have strong treatment of non-linear signal and generalization ability, which is used to reduce the chattering in sliding mode control. The parameters of fuzzy support machines controller are optimized by hybrid learning algorithm, which combines least square algorithm with improved genetic algorithm, to get the optimal control performance for the object. The simulation results demonstrated that the control strategy designed gets tracking effect with high precision and speed, as well as reduces chattering of control under the condition of model error and external disturbance.

Abstract: Endurance test of vehicle transmission usually takes long time and spends a lot of electric energy. In order to save energy, a new kind of transmission endurance tester equipped with a DC brake motor and a digital DC reversible speed governor is developed. The tester can transfer electricity generated by the brake motor back into the electric grid. The experiment result shows that the average ratio of electricity recycle is as high as 68 percent. The tester can be used for transmission endurance test of various kinds of construction machineries and vehicles.

Abstract: The characteristic physical properties of titanium alloy materials of the electrical discharge machining (EDM) small hole is studied theoretically and experimentally. From the theory of EDM, based on the phenomenon of microcosmic surface on EDM small hole, the model of surface roughness is built, and the regulation between roughness and pulse width, peak electric current was analyzed, and the roughness empiric formula is developed by use of dyadic linear regression method. Furthermore, by computer simulation technology with established formula the results are derived for other people to public data simulation. After being simulated, the results show that the established model in this paper can accurately forecast the value of processing roughness Ra of commonly used in the processing parameters within the framework, provides a useful complement to titanium alloys for processing the theoretical study and practical application.

Abstract: This paper describes an additive manufacturing technology that has the potential to print plastic components with integral conductive polymer electronic circuits. This could have a major impact in the fields of robotics and mechatronics as it has the potential to allow large wiring looms, often an issue with complex robotic systems, to be printed as an integral part of the products plastic shell. This paper describes the development of a novel Fused Deposition Modeling (FDM) process in which the layers of material that make up the part are deposited as curved layers instead of the conventional flat layers. This opens up possibilities of building curved plastic parts that have conductive electronic tracks and components printed as an integral part of the plastic component, thereby eliminating printed circuit boards and wiring. It is not possible to do this with existing flatlayer additive manufacturing technologies as the continuity of a circuit could be interrupted between the layers. With curved-layer fused deposition modeling (CLFDM) this problem is removed as continuous filaments in 3 dimensions can be produced, allowing for continuous conductive circuits.

Abstract: This paper proposes a framework which focuses on thoroughly resolving functional dependency among components and enabling “Delay Adaptation”. This framework introduces an “Adaptation Table” to describe components’ interfaces and their interactions. Since functional dependency comes from the interactions among components, this “Adaptation Table” makes the dependency under control, a support toolkit is also developed. At last, the analysis of a case shows that the framework achieves the result that we expect in great measure.

Abstract: According to thermal comfort and energy conservation of trailer house, it analyzes the heat transfer characteristics about envelop enclosure of trailer house in cold regions. And it is got by the method of non-steady state heat conduction from two aspects, that is, the heat conduction and heat storage of envelop enclosure. It gets the method to calculate heat load of envelop enclosure and the conclusion that the vacuum insulation panel located inside the enclosure of house is more suitable in cold regions.

Abstract: The pre-cooling device was built and the columnar cabbage was taken as the study object in this paper. The heat and mass transfer mathematical models for the cylindrical shape vegetable were built and the experimental method was introduced to prove them. The comparison and analysis, under the certain vacuum degree of the vacuum chamber, was done between the simulation and the experiment. And the differences of the vacuum degree in the chamber, the temperature change of the cabbage, the relative humidity in the chamber and the cabbage mass loss, in the experiment and the simulation, were all recorded. The reason of the parameters variance and existent deference was also analyzed in this paper. The mathematical models and the result were useful for the study on the cylindrical vegetable vacuum pre-cooling technology.