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Frequency domain based super-resolution method for mixed-resolution multi-view images

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Journal of Systems Engineering and Electronics 2016年第6期27卷 1303-1314页

作者： zhizhong fu Yawei Li Yuan Li Lan Ding Keyu Long School of Communication and Information Engineering University of Electronic Science and Technology of ChinaChengdu 611731China The Second Research Institute of Civil Aviation Administration of China Chengdu 610041China

Super-resolution (SR) techniques, which are based on single or multi-frame low-resolution (LR) images, have been extensively investigated in the last two decades. Mixed-resolution multiview video format plays an important role in three-dimensional television (3DTV) coding scheme. Previous work considers multiview or multi-camera images and videos at the same resolution, which performs well under the planar model without or with little projection error among the videos captured by different cameras. In recent years, several researchers have discussed the SR problem in mixed-resolution multi-view video format, where the superresolved image is created using the up-sampled version of the LR image and the high frequency components extracted from the warped image in the adjacent high-resolution (HR) views. Unfortunately, the output HR images suffer from artifacts caused by depth error. To obtain the detailed texture and edge information from the HR image as much as possible, while preserving the structure of the LR image, a novel SR reconstruction algorithm is proposed. The algorithm is composed of three components: the structure term, the detail information term, and the regularization term. The first term preserves the structure similarity of the LR image; the second term extracts detailed information from the adjacent HR image; and the last term ensures the uniqueness of the solution. Experimental results show the effectiveness and robustness of the proposed algorithm, which achieves high performance both subjectively and objectively. © 2016 Beijing Institute of Aerospace Information.

关键词： Cameras Edge detection Frequency domain analysis Image reconstruction Optical resolving power

Improved single image dehazing using dark channel prior

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Journal of Systems Engineering and Electronics 2015年第5期26卷 1070-1079页

作者： zhizhong fu Yanjing Yang Chang Shu Yuan Li Honggang Wu Jin Xu School of Communication and Information Engineering University of Electronic Science and Technology of China The Second Research Institute Civil Aviation Administration of China

An improved single image dehazing method based on dark channel prior and wavelet transform is proposed. This pro-posed method employs wavelet transform and guided filter instead of the soft matting procedure to estimate and refine the depth map of haze images. Moreover, a contrast enhancement method based on just noticeable difference （JND） and quadratic function is adopted to enhance the contrast for the dehazed image, since the scene radiance is usual y not as bright as the atmospheric light, and the dehazed image looks dim. The experimental results show that the proposed approach can effectively enhance the haze ima-ge and is wel suitable for implementing on the surveil ance and obstacle detection systems.

关键词： Equilibrium global stability infinite delay iterative method plankton allelopathy

A physically-based representative stress methodology for predicting stress rupture life of Ni-based DS superalloy

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Chinese Journal of Aeronautics 2023年第6期36卷 174-185页

作者： Jia HUANG Zhenzhuo HE Shuangqi LYU Xiaoguang YANG Duoqi SHI Yantao SUN Yongzhao LYU zhizhong fu Guolei MIAO Jianan SONG School of Aeronautics and Astronautics Central South UniversityChangsha 410083China Aviation Engineering College Civil Aviation University of ChinaGuanghan 618307China School of Energy and Power Engineering Beihang UniversityBeijing 100083China Beijing Aeronautical Engineering Technical Research Center Beijing 100076China Chengdu Holy Industry&Commerce Corp.LTD Pengzhou 611936China School of Mechanical and Electrical Engineering Central South UniversityChangsha 410083China

Smooth and three types of U-shape single-edge notched plate specimens adopted to experimentally investigate stress rupture behavior of Ni-based Directionally Solidified(DS)superalloy at 850℃ exhibit notch weakening effect and multi-source cracking initiation near the notch ***,stress rupture behavior of smooth and V-shape notched round bars at 1040℃ revealed by Li et al indicates notch strengthening effect and creep micro-holes originating mostly from the central portion.A combined creep-viscoplastic constitutive model is employed to analyze the distribution of stress,strain and stress Triaxial Factor(TF)near the notch *** different stress distribution and creep restraint between asymmetric notched plate specimens and symmetric notched round bars are the main reasons for the corresponding failure ***,a good qualitative relationship exists between TF value and stress rupture life of notched ***,the area with maximum TF value(TF_(max))is highly consistent with creep damage initiation ***,based on the distribution characteristics of the initial tensile loading,a representative stress method independent of time-changing creep load at the location of TF_(max) is conducted for life *** predicted results of both smooth and notched plate specimens and round bars agrees well with the experimental results.

关键词： Creep Life model Ni-based superalloy Notched round bar Single edge notch

Aeroelastic Analysis of a Transonic Fan Blade with Low Hub-to-Tip Ratio including Mistuning Effects

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Journal of Power and Energy Engineering 2015年第4期3卷 362-372页

作者： zhizhong fu Yanrong Wang School of Energy and Power Engineering Beijing University of Aeronautics and Astronautics Beijing China

This paper presents a comprehensive investigation of aeroelastic stability for a high aft-swept transonic fan blade with low hub-to-tip ratio. The evolution of the blade’s aeroelastic stability in the first bending modes is studied. A 3D flutter computation representing today’s industry standard is performed. Steady state flow field and motion-induced unsteady pressures acting on the blade have been determined by a 3D Reynolds-Averaged Navier-Stokes (RANS) equations with a standard k-ε turbulence model. A weakly coupled (one-way) method has been employed to describe the interaction between fluid and structure. The results of aerodynamic damping indicate a significant shock-driven risk. To increase the flutter margin by a viable method, a statistical mistuned aeroelastic stability investigation has been performed. It has been found that alternately intentional mistuning with a small blade frequency offset stabilizes the system effectively. However, as the standard deviation of random mistuning reaches some critical values, the introduction of alternately intentional mistuning does not provide any additional stabilizing effects.

关键词： Aeroelastic Stability Flutter Turbomachinery Mistuning

Improved single image dehazing using dark channel prior

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Journal of Systems Science & Complexity 2015年第5期28卷 1070-1079页

An improved single image dehazing method based on dark channel prior and wavelet transform is proposed. This proposed method employs wavelet transform and guided filter instead of the soft matting procedure to estimate and refine the depth map of haze images. Moreover, a contrast enhancement method based on just noticeable difference(JND) and quadratic function is adopted to enhance the contrast for the dehazed image, since the scene radiance is usually not as bright as the atmospheric light,and the dehazed image looks dim. The experimental results show that the proposed approach can effectively enhance the haze image and is well suitable for implementing on the surveillance and obstacle detection systems.

关键词： single image haze removal dark channel prior guided filter wavelet transform contrast enhancement quadratic function

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关于我国产品责任法重构的若干思考

河南社会科学 2005年第2期13卷 73-74,125页

作者：付志中郑州大学法学院河南郑州450052

我国现行产品责任立法应该借鉴外国的缺陷产品召回制度和惩罚性赔偿制度。对我国产品责任立法的重构,可从安全注意义务、强制责任保险制度、产品召回制度等方面进行。

关键词：产品责任法重构思考

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串口中断编程技术及应用

仪器仪表学报 2006年第Z3期27卷 2558-2559,2584页

作者：李蓉傅志中上海理工大学上海200093

本文分析了串口通讯原理和计算机中断技术,探讨了基于中断方式的串口编程技术及C语言实现代码,并给出了粗纱机控制系统开发应用实例。

关键词： RS232 串口通讯中断

Numerical Simulation of Transient Flow in Product Pipeline

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Numerical Simulation of Transient Flow in Product Pipeline

Comparison of Finite Difference and Finite Volume Method Basd on MAC for Numerical Simulation of Driven Cavity Flow

第二届国际计算科学与工程国际学术研讨会

作者： Jiangfei Li Lian Yuan zhizhong fu Bo Li Changchun Wu China University of Petroleum （Beijing）

In this paper, explicit difference scheme, implicit difference scheme and characteristics method are compared to simulate transient flow in product pipeline. The simulation results of pressure and temperature can be used to prevent water hammer in the pipeline and improve the efficiency and safety in oil transmission. The stability and accuracy of the three methods are compared by adopting different time steps. For explicit method, large fluctuation may occur in case of large time step. For implicit method, the results are affected little by time step, only if the relaxation factor selected is reasonable. For characteristics method, the results have a good convergency and high precision. The results show that, in the situation of valve shut down in terminal station, it takes about 1.1×10 4 seconds to return to a new steady state.

关键词： Product pipeline Explicit scheme Implicit scheme Characteristics method

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Comparison of Finite Difference and Finite Volume Method Bas...