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A Linear Iteration Image Restoration Method Based on Homology Continuity
Yonghua Zhu,Shunyi Mao,Pin Wu,Honghao Gao,Zhiguo Wu 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.11
A novel image restoration method based on homology continuity is proposed in this paper. We view images as a collection of gray scale points, taking advantage of the homology continuity principle to combine each point and its fuzzy point derived by drop mass function to constitute the path direction and obtain distinct restore points. The gather of all the restore points is the sharply focused image of the original image. At last, we found every picture by iteration method is clearer than the last by experiment with the method proposed in the paper. The result verifies its feasibility.
Research on Braking Process of High-speed Train with Aerodynamic Brake
Yonghua Zhu,Weilie Shang,Xia Zhang,Hongjie Yan,Pin Wu 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.12
The speed is higher, the kinetic energy is greater. In order to ensure the safety of a new generation train running in a high speed, it is necessary to research on its braking performance. In this paper, the braking force, running resistance, braking time, braking distance and the deceleration generated by the train with two kinds of braking wings were analyzed while the high-speed train was doing deceleration movement. And the results were compared and analyzed between the train with and without braking wing, and between the two kinds of braking wings. The results showed that the high speed train with braking wings made much contribution to the acceleration in the braking process, especially the train is in high speed.
Yonghua Wu,Fugui Yang,Hao Zhang,Fengpo Yan,Ruijuan Zuo 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.4
By the solid-state reaction method, the NaY(WO4)2 : Mn2+, Dy3+, Eu3+ phosphors are synthesized successfully. The sample’sphase-structure and morphology have been characterized by XRD and EDS. The concentrations of Mn2+, Dy3+, Eu3+, Y3+ andW6+ are measured by ICP, The result implies that the doped process of Mn2+, Dy3+ and Eu3+ is very easy in host NaY(WO4)2. The absorption and excited spectra are presented, The absorption spectrum of Mn2+ is always broad, but the Dy3+, Eu3+hasrelatively sharp absorption peaks.Using the commercial LED of 365 nm wavelength as the excitation light, the emission spectrawith different doped concentrations ratios of Mn2+ are obtained. The Mn2 + doping reduces the emission intensity of Dy3+,alsoit has meaningful influence on the tunable green-yellow-red LED.The high doped concentration of Mn2+ can guarantee theemission intensity of 546 nm enough.
Application of the Multi-Source Data Fusion Algorithm in the Hail Identification
Yonghua Zhu,Yongqing Wang,Zhiqun Hu,Fansen Xu,Renqiang Liu 한국기상학회 2022 Asia-Pacific Journal of Atmospheric Sciences Vol.58 No.3
In this study, the canonical correlation analysis algorithm (CCA) is used to fuse the two-dimensional wind field retrieved from the single-Doppler weather radar, the three-dimensional wind field retrieved from the dual-Doppler weather radars, the observations from the ground automatic weather stations and the meteorological reanalysis data in three hail episodes (“0625” episode in Beijing, “0330” and “0801” episodes in Guangdong). During the hail episode in Beijing on June 25, 2020, an evident and long-lasting three-body scatter spike was observed, which played an important role in the hail identification and warning. In the three-dimensional wind field retrieved from the dual-Doppler weather radars, there is horizontal convergence of northeasterly and northwesterly winds and that of northwesterly and southeasterly winds in the low-level strong echo area, and there are obvious updrafts in the vertical wind field structure. Such a circulation configuration is favorable for the development and maintenance of hail storm. The multi-source data fusion of the wind fields can effectively improve the identification of the low-level convergence. The data fusion for the other two hail episodes (“0330” and “0801” episodes in Guangdong) yields the same conclusion. It is revealed that the dual-radar fusion performs better than the single-radar fusion in the identification of the meso-γ scale vortices. It can visually illustrate the characteristics of the cyclonic convergent flow fields which is more consistent with the near-surface observation. It can be concluded that the multi-source data fusion technique is practicable in the three severe convection processes.
The class of modules with projective cover
Yonghua Guo 대한수학회 2009 대한수학회지 Vol.46 No.1
Let R be a ring. A right R-module M is called perfect if M possesses a projective cover. In this paper, we consider the relationship between the class of perfect modules and other classes of modules. Some known rings are characterized by these relationships. Let R be a ring. A right R-module M is called perfect if M possesses a projective cover. In this paper, we consider the relationship between the class of perfect modules and other classes of modules. Some known rings are characterized by these relationships.
A modal approach for the efficient analysis of a bionic multi-layer sound absorption structure
Yonghua Wang,Chengyu Xu,Yanling Wan,Jing Li,Huadong Yu,Luquan Ren 국제구조공학회 2016 Steel and Composite Structures, An International J Vol.21 No.2
The interest of this article lies in the proposition of using bionic method to develop a new sound absorber and analyze the efficient of this absorber in a ski cabin. Inspired by the coupling absorption structure of the skin and feather of a typical silent flying bird — owl, a bionic coupling multi-layer structure model is developed, which is composed of a micro-silt plate, porous fibrous material and a flexible micro-perforated membrane backed with airspace. The finite element simulation method with ACTRAN is applied to calculate the acoustic performance of the multi-layer absorber, the vibration modal of the ski cabin and the sound pressure level (SPL) near the skier's ears before and after pasting the absorber at the flour carpet and seats in the cabin. As expected, the SPL near the ears was significantly reduced after adding sound-absorbing material. Among them, the model 2 and model 5 showed the best sound absorption efficiency and the SPL almost reduced 5 dB. Moreover, it was most effctive for the SPL reduction with full admittance configuration at both the carpet and the seats, and the carpet contribution seems to be predominant.
Yonghua Cui,Yuxin Shu,Yuanyuan Zhu,Yonghui Shi,Guowei Le 한국식품영양과학회 2012 Journal of medicinal food Vol.15 No.8
High-fat diets (HFDs) have been found to influence central nervous system development and to cause cognitive impairments in human epidemiologic studies, as well as in animal investigations. These adverse effects on learning and memory induced by an HFD have been associated with an impaired hippocampus, including hippocampal oxidative damage. Previously, we had found that a-lipoic acid (a-LA) could ameliorate the oxidative stress in non-neural organs (liver, jejunum,and spleen) induced by a 10-week HFD (21.2% fat) food regimen in mice. In this study, we investigated whether a 10-week HFD (21.2% fat) induced oxidative stress in the hippocampus or impaired spatial learning in mice and whether LA ameliorated these effects. The HFD was found to induce oxidative stress (a decrease in catalase activity, glutathione peroxidase activity, and total antioxidative capacity and an increase in malondialdehyde levels) in the mouse hippocampus. In addition,we found that the HFD impaired spatial recognition memory of mice in the Y-maze paradigm. Furthermore, the hippocampal oxidative stress and impaired spatial recognition memory of the mice were reduced in HFD diets supplemented with 0.1% LA. These findings suggest that LA, as a strong antioxidant, may help prevent HFD-induced learning impairments by ameliorating associated oxidative stress in the hippocampus.
Energy Aware Wireless Sensor Network Low Energy Consumption Full Network Coverage Algorithm
Luo Yonghua,Wu Jiawei,Qiu Shangming 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.7
The energy aware based active node decision and the sensing directions thereof become the research hotspots of DNN (Directional Sensor Network). Therefore, an EACO (Energy aware-based coverage optimal) algorithm is proposed in this paper. Specifically, each cluster head decides the number of the active nodes of the cluster members and the sensing directions thereof according to the coverage area of the sensor nodes and the energy information thereof. Meanwhile, the dormancy mechanism is adopted to minimize the overlapping area among the clusters. The simulation result shows that the proposed EACO algorithm is improved in the aspects of coverage rate and network lifetime.