最新刊期
期 7 ， 2016
- 摘要：Zinc oxide (ZnO) quantum dot is a kind of wide direct band gap semiconductor nanoparticle, with many advantages, e.g., larger exciton binding energy,environmental friendly, quantum effects, which has attracted a number of attentions. Recently, the ZnO quantum dots prepared through chemical solutions was applied more actively in the study of light emitting diodes. The review describes the achievements in the field of ZnO quantum dot light emitting diode in recent years. We concentrate on the current achievements and problems of the ZnO quantum dot light emitting diode of various structures, and the development trend of ZnO quantum dot light emitting diodes in the future.关键词：zinc oxide;quantum dot;electroluminescence;light-emitting diodes
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发布时间：2020-07-07 - 摘要：
An organic/inorganic composite electrical bistable device has been fabricated by utilizing hybrid lead sulfide (PbS) nanocomposite and poly(N-vinylcarbazole) (PVK) film. And the device performance has been tested in order to analyze the charge transport mechanism. First,the cube-shaped PbS nanocrystals were synthesized by the thermal injection method, then electrical bistable device was fabricated by utilizing composite of poly(N-vinylcarbazole) and lead sulfide nanocrystals as the active layer.The device e 关键词：organic-inorganic nanocomposite films;electrical bistable devices;ON/OFF current ratio;PbS nanocrystals- 57
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发布时间：2020-07-07 - 摘要：In-plane switching liquid crystal displays (IPS-LCDs) are widely applied in TFT-LCD for its excellent viewing angle and outstanding ability of color reproduction. However, its development in high-end LCDs is limited by its slow response. A fast response IPS-LCD with protrusion electrode is proposed in this paper, and its optical characteristics is simulated by TechWiz software. With the protrusion electrode, the driving voltage of IPS-LCD is reduced by 2.3 V. Although the driving voltage is reduced, the electric field in the liquid crystal layer is changed due to the electrode on protrusion, so the rise response speed is improved. In addition, the protrusion structure reduces the effective cell gap of the LC layer, and the decay time is proportional to the square of the cell thickness, so the decay response speed is also obviously improved. The whole response speed is improved by approximately 38% in contrast with the conventional IPS-LCD.关键词：in-plane-switching liquid crystal displays;driving voltage;fast response;protrusion electrode
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发布时间：2020-07-07 - 摘要：
In order to obtain the specific characteristics of human visual system and support engineering design and ergonomic evaluation directly, a kind of chromatic contrast sensitivity was defined according to RGB color space which was widely used by display equipment. First, a threshold measurement method of chromatic contrast sensitivity was generated.Then 12 participants' data which contained two time periods, three variables and ten spatial frequencies were collected. Finally, Pearsontest analysis was used to 关键词：chromatic contrast sensitivity;RGB color space;LED display;spatial frequency;characteristics of eye- 64
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发布时间：2020-07-07 - 摘要：
Vertical alignment liquid crystal display mode has good dark state, so that it has high contrast ratio. However,it's viewing angle is not good.The viewing angle can be improved by using multi-domain vertical alignment (MVA) and patterned electrode vertical alignment (PVA). However, the protrusion in MVA may lead to light leakage because of the small tilt angle in the initial state, which reduces the contrast ratio. While the light leakage is removed in PVA because the protrusion is replaced by the patterned 关键词：liquid crystal display;high contrast ratio;multi-domain;viewing angle controllable- 80
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发布时间：2020-07-07 - 摘要：Chiral dopant plays an important role in TN model. To investigate how chiral dopant adjusts performance of TN model, two liquid crystal mixtures which were made of different liquid crystal system were chosen as hosts, and then two series of chiral-nematic liquid crystal mixtures which contain different concentration of chiral dopant were obtained. The alignment of LCs in cells was investigated and explained theoretically from the view of elastic constants K. It indicates that chiral dopant affect the alignment behavior of LCs. The concentration of chiral dopant is proportional to threshold voltage and steepness. However, the concentration of chiral dopant is inversely proportional to contrast ratio. The research of chiral dopant could make the LCs match the integrated circuit (IC) better, which contribute to a higher contrast ratio and make the display more clear, detailed and realistic.关键词：TN-LC;pitch;chiral dopant;elastic constants K
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发布时间：2020-07-07
Materialand Device
- 摘要：The traditional fault diagnosis for equipment in TFT-LCD is inefficient and disperses experience. Expert system of equipment fault diagnosis based on rule can reduce fault diagnosis time and integrate fault diagnosis experience efficiently. Production rule is applied in knowledge set in expert system and improve knowledge set growth and accuracy with fixed format, intuitive, natural and similar to human thinking. The expert system can provide solutions for TFT-LCD equipment fault and reduce diagnosis time by 35.5% in average.关键词：production rule;knowledge set;fault diagnosis;TFT-LCD equipment
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发布时间：2020-07-07 - 摘要：In the process of long-term service, the bearing capacity and durability of material reduced, and traditional dynamic monitoring has some problems,such as low monitoring precision, routing complexity etc.So it is hard to provide the required data for the analysis of material structure damage. Aiming at this phenomenon, we have designed the dynamic monitoring system which takes STM32 microcontroller as the core. We carried on the temperature compensation of the pressure sensor and at the same time dealed with the data collected in the process.The practice has proved that this monitoring system can realize the wireless transmission and improve accuracy of monitoring system.Meanwhile,it can also provide the better simulation analysis data for Peridynamics theory.The practice verified that it can achieve expected results.关键词：wireless transmission;dynamic monitoring;Peridynamics;data collection
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发布时间：2020-07-07
Driving and Controlling
- 摘要：Active Contour Models are the essential instruments for image segmentation and have great development in both theory and application. However, these existing models cannot work well in the presence of intensity heterogeneity, and are in general sensitive to initial curve places. Therefore, a novel active contour is proposed so as to extract correctly vessels, which takes into account image intensity and vessel features simultaneously. The new model is obtained by local phase vesselness-enhanced algorithm, and is based on local binary fitting. Experimental results, which based on publicly available Digital Retinal Images for Vessel Extraction (DRIVE), show that our model can successfully extract the desired vessels in the presence of intensity inhomogeneity with 74.43% pixel sensitivity and 93.67% segmentation accuracy, and the model is insensitive to initial curve placement. This demonstrates our model is competent for image segmentation with high accuracy and robustness.关键词：active contour;local phase;intensity inhomogeneity;local binary fitting
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发布时间：2020-07-07 - 摘要：
Histogram equalization and its improved version may cause tinny gray levels coalition and over-enhancement in the output infrared image without any constraints. In order to solve this problem, we propose plateau histogram equalization based on scene complexity computation. Firstly, Harris algorithm is used to detect corner. Then an evaluation function, which is similar to the sigmoid function, is established to calculate the degree of complexity for an image. Finally, a global transformation function is gai 关键词：infrared image enhancement;plateau histogram equalization;image complexity;corner detection;harris algorithm- 38
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发布时间：2020-07-07 - 摘要：
In communication systems, power amplifiers (PAs) play an important role and consume large amount of power. As a consequence, the enhancement of amplifier efficiency is significantly important for saving energy. The goal for this paper is to find the matching impedances of harmonics and build a matching network for optimum efficiency performance of an amplifier. The load pull technique is applied in this paper to control the impedances with automatically controlled tuners. Firstly, a calibration of the autom 关键词：harmonic;matching;load pull technique- 46
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发布时间：2020-07-07 - 摘要：To pick-up a specified coordinate of a point is a basic operation for a 3D model file. Aimed at the shortages of traditional methods about 3D picking, a new method, which points at getting the original coordinate of specified point, is proposed.During picking, rotation at any angle is allowed. So points either on the side or on the back can be selected.And rotation matrix is used to restore points to their original state.The method transform the two-dimensional pixel coordinate to 3D model coordinate then to original model coordinate. All the points on visible surface can be picked precisely by this method and thus the flexibility is improved.关键词：OpenGL;three-dimension model;pick-up;coordinate
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发布时间：2020-07-07 - 摘要：This paper presents a fast method for Canny algorithm based on GPU+CPU. The Canny algorithm is divided into two parts:Gauss filtering, gradient computations, non maximum suppression and double thresholding are processed by GPU. The fast method convert two-dimensional Gaussian filter to two separable convolutions to reduce the computation complexity. Then, multiple threads execute kernel in parallel to speed up the computation in the CUDA program. Finally, threads access shared memory instead of global memory to hide the latencies of global memory. In addition, FIFO is used to connect components in CPU. The simulation results show that the processing time of the 8-bit images with the resolution 1 024×1 024 is 122 ms, which is 5.39 times faster than CPU. Therefore, this method takes full advantage of the parallelism of GPU and the serial processing capability of CPU.关键词：Canny;CUDA;GPU;acceleration
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发布时间：2020-07-07 - 摘要：In view of screws counting problem in traditional warehouse management system,digital image processing is introduced to the detection and counting of screws. A method for screws automatic counting based on image processing ispresented.Processing the shelves without placing screws is to detect and record placed screw position information, establishing the template.In order to establish an accurate template, a way of human-computer interaction is proposed to correct, which can effectively solute the impact of light, noise, etc.Then unplaced screws image (template image) subtracts the detected image, standing out the features of placed screws. Finally, template matching is used to position the screws. Experimental results show that this method can effectively solve the impact of shelves damaged, screws oxidation and noise interference,and realizes simple. Counting accuracy rate of this method can achieve above 98%, and average detection time is 3.67 ms, significantly improving warehouse management capabilities.关键词：warehouse management;automatic counting;interactive;template matching
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发布时间：2020-07-07 - 摘要：This paper proposes a salient object detection method based on structured labels learning, applying a structured learning method to salient object detection. Firstly, we get a fixed rectangular region randomly from the local image which includes the labeling, and record the corresponding structured labels. Then, a collection of decision trees is built by using the regional features which includes the structured labels.Finally, the final saliency map is captured by using the supervised learning approach. Experiments show that our method can detect the salient objects accurately,and the AUC scores are 0.891 8 and 0.705 2 on the MSRA5000 and BSD300 datasets, the result shows that our method can achieve good effect in salient object detection.关键词：salient object detection;structured labels;decision trees;supervised learning
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发布时间：2020-07-07
Display and Image
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