In the CAN bus, mistakes in bit timing will lead to serious decline in bus performance. How to deal with the bit timing of CAN bus communication decided whether the CAN controller can receive or transmit data correctl...
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In the CAN bus, mistakes in bit timing will lead to serious decline in bus performance. How to deal with the bit timing of CAN bus communication decided whether the CAN controller can receive or transmit data correctly. According to bus protocol, bit synchronization will fix bit errors resulting from improper setting in many cases. This paper illustrated the structure of nominal bit time and the principle of bit synchronization, gave an optimized method of nominal bit time of CAN2.0 protocol, that the four non-overlapping segments of traditional nominal bit time is simplified to 3 non-overlapping segments, and on this basis, proposed a design method of bit timing processor of CAN bus based on the synchronized state machine. It also provides programmable time segments to compensate for the propagation delay times and phase shifts, and gave simulation and verification of the design. The results show that the design work which obeys the CAN2.0 protocol, can more easily deal with the CAN bus communication bit timing, realized the control of CAN bus protocol on the bit timing and bit synchronization, and better optimizes the CAN network.
The network control of CNC machine is the inexorable development trend of modern manufacturing industry, and the combination of embedded technology with network has become a research hot. This paper puts forward a nov...
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A scheme for auto classification of skin symptom is introduced in this paper. It classifies different skin symptoms based on the principle of least Mahalanobis distance. Skin images with symptom to be identified will ...
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A scheme for auto classification of skin symptom is introduced in this paper. It classifies different skin symptoms based on the principle of least Mahalanobis distance. Skin images with symptom to be identified will be preprocessed at first. Basic operations of preprocessing includes color space transformation, image segmentation based on threshold by self-adapting method, image post-processing by mathematical morphology, edge detection, contour tracing, seed filling and so on. After that, twenty-six characteristic parameters are extracted from symptom areas of the processed image. Calculate the distance between these parameters and the preset parameters of standard symptoms (chloasma, comedo, blackhead and ephelis), and we can classify the symptoms to certain category in accordance with their Mahalanobis distance in terms of the least difference principle.
Traditional bilinear scaling method requires pre-zoom operation while zooming-out an image. In that way, the image resizing system will demand two different scaling sets, one for zooming-out and another for zooming-in...
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Traditional bilinear scaling method requires pre-zoom operation while zooming-out an image. In that way, the image resizing system will demand two different scaling sets, one for zooming-out and another for zooming-in, and hence leads to higher cost of hardware implementation and system complication. This paper presents an improved scaling method called window-scaling algorithm. It is relatively low cost and easy to implement. And within the limitation of clock frequency, it could support any mode of display resolution. Basic principle of the proposed algorithm is introduced at first and then scaling effect of different algorithms are compared and analyzed by software. After that, hardware implementation of the algorithm, as well as the general structure is presented in detail. FPGA verification has proved the feasibility and efficiency of the proposed algorithm.
Electronic packaging industry widely uses a dispensing technology to deliver adhesive materials on substrates through a dispensing system. The cured adhesives can encapsulate and connect chips and substrates to provid...
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Electronic packaging industry widely uses a dispensing technology to deliver adhesive materials on substrates through a dispensing system. The cured adhesives can encapsulate and connect chips and substrates to provide mechanical, physical and chemical protections. For the high density packaging, a jet dispensing is regarded as the next generation adhesive delivery technology due to its features of non-contact, high precision and high efficiency. We developed a jet dispensing system including a jetting dispenser, a 3-axis movement platform, a substrate carrier, a power module, motion control hardware and software, supplementary modules, etc. The jetting dispenser is the most part since it affects the accuracy and quality during the dispensing process. Before its structure design and prototype manufacturing some important physical parameters can be determined by the fluid dynamics analysis. In the jetting dispenser, a piston drives a needle to move downwards and push the fluid flowing in the chamber and dispensing out of the nozzle. A simplified physical model has been set up to promote discussing the dynamic properties of the fluid. The results of dynamics analysis reveals that there are a back flow and a jetting flow existing in the chamber and an unsteady flow existing in the nozzle. The flow rate and volume are the most key parameters for the dispenser design. They are dependent on the nozzle length and diameter, the chamber length and diameter, the dynamic viscosity, the coefficient of the on-way resistance, the needle speed and the initial pressure on adhesive.
Organic light-emitting device (OLED) is regarded as the potential application for future display. However, one of the bottlenecks is the OLED package issue, which results in short term device lifetime. Currently, a ne...
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Organic light-emitting device (OLED) is regarded as the potential application for future display. However, one of the bottlenecks is the OLED package issue, which results in short term device lifetime. Currently, a new laser bonding package process is proposed. In this paper, the investigation of transient temperature field analysis for the laser bonding process is presented. Finite element model is applied in ANSYS and compiled by subroutine of APDL. Moving heat flux and birth-death element method are both adopted in order to achieve the complicated bonding process. The laser bonding process comes to quasi-steady state after a short time of initial transient stage. Through a series parameters simulation, parameters as moving velocity, laser power and laser beam radius show a significant effect on bonding process. Furthermore, by case study, the optimization of the bonding parameters was carried out for future experimental investigation and validation.
A new modeling for the local fractional Fourier's transform containing the local fractional calculus is investigated in fractional space. The properties of the local fractional Fourier's transform are obtained...
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A new modeling for the local fractional Fourier's transform containing the local fractional calculus is investigated in fractional space. The properties of the local fractional Fourier's transform are obtained and two examples for the local fractional systems are investigated in detail.
This paper presents a method of multi-Scan-Enable DFT design for at-speed scan testing to improve transition fault coverage. Base on the method, we build a novel TR-TC (Test Resources-Test Coverage) associated test co...
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Today the research on design for testability is becoming the research priority in the filed of SoC. However, the traditional research is limited in top level of SoC and it ignores the inference resulting from the sche...
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Traditional coding method used the same prediction structure to encode the multi-view sequences whose correlation are distinctly different. This method eliminated the temporal and spatial redundancy by using multi-ref...
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ISBN:
(纸本)9781424458561
Traditional coding method used the same prediction structure to encode the multi-view sequences whose correlation are distinctly different. This method eliminated the temporal and spatial redundancy by using multi-references blindly. Although the traditional prediction structures have quite good coding efficiency, it results in the problem of high complexity. So by analyzing the characteristic of the multiview video data itself, we designed a correlation testing structure and depending on the correlation intensity on both the temporal and spatial direction, a method of multiple prediction structures coding jointly is proposed. Experimental results show that the proposed method can reduce the coding complexity while maintaining high coding efficiency, and to the sequences whose spatial correlation is quite strong, the method given can not only raise the PSNR, but reduce the bitrate as well.
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