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Wavelet Subspace Based Integrated Face Recognition Scheme
Wenhui Li,Ning Ma,Zhiyan Wang 보안공학연구지원센터(IJSIP) 2014 International Journal of Signal Processing, Image Vol.7 No.6
In this paper, based on the study of the Two-Dimensional Principal Component Analysis (2DPCA), Two-Dimensional Principal Component Analysis (2DPCA) and fuzzy set theory, we propose a integrated face recognition algorithm based on wavelet subspace. This method can make good use of the advantages of each single method, and also can make up for the defect of each other. The comparison of the results of the different methods identification effect on the ORL、YALE and FERET face database show, the integrated method proposed in this paper improves the recognition rate, and it also reduces the training and classification time as well.
Wenhui Wang,Wang Zhang,Xiyang Liu,Xu Zhang,Weiqiang Huang,Zejian Deng 한국정밀공학회 2024 International Journal of Precision Engineering and Vol.25 No.5
Traditional manual teaching or offline programming welding modes may lead to long teaching time, low efficiency, and inability to adapt to changing welding environments when facing complex trajectory workpieces or Multi-welded workpieces. In this paper, a teaching-free welding method based on visual sensing system for robotic is proposed. Firstly, the three-dimensional information of the workpiece surface is captured by a monocular structured light camera and characterized by point cloud data. Point cloud stitching is performed on multiple local images of large-size workpieces to reconstruct the welding surface. Then, statistical filtering and deep learning methods are used to preprocess and segment the point cloud to obtain the reference points of the welding path. Finally, according to the shape characteristics of the workpiece, the auxiliary projection method is used to automatically generate the robot surfacing path. Experimental results show that under the condition of camera accuracy of ± 0.05 mm, the maximum planning path error is less than 1 mm, which meets the actual welding needs. This method is significant for achieving welding automation and improving production efficiency.
Study on liquid-solid jet erosion characteristics of 316L stainless steel
Guan Wang,Qianfeng Gao,Linyuan Kou,Pei Zhang,Wenhui Wang,Jianfei Deng,Xuejun Zhu 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.4
The essence of erosion is the dynamic damage and material loss process of a material caused by particle impact. The failure mechanism of erosion is the result of the interaction of multiphase flow, particle characteristics, material properties, particle impact process, and other factors. This paper employs experimental and numerical simulation methods to investigate the erosion behavior of a solid-liquid two-phase flow of 316L stainless steel jet from the angle of erosion, to explain the erosion behavior from both macroscopic and microscopic perspectives. The results discovered that the kinetic energy of the fluid is converted into pressure potential energy, which changes the kinematic characteristics of the particles and influences how they erode. The particles erode the target material by plowing and impacting at various erosion angles, and the erosion rate exhibits an increasing-decreasing-increasing tendency as the erosion angle increases, the 45° corresponds to the maximum erosion rate. Due to the particles to harden the target surface, the erosion effect is diminished in the time dimension. Comparing to high erosion angles, the reduction rate of the erosion rate in the late experiment stage is small for slow erosion angles. In the last 3 hours of the experiment, the total erosion of 316L stainless steel at 90° erosion angle was only 35 %. This provides a theoretical foundation for failure prevention in transport components containing solid particles.
Effect of IgY on Periodontitis and Halitosis Induced by Fusobacterium nucleatum
( Fang Wang ),( Wu Qiao ),( Bin Bao ),( Shujun Wang ),( Joe Mac Regenstein ),( Yilei Shi ),( Wenhui Wu ),( Ming Ma ) 한국미생물 · 생명공학회 2019 Journal of microbiology and biotechnology Vol.29 No.2
Fusobacterium nucleatum is a morbific agent in periodontitis and halitosis. Egg yolk antibody (IgY) was obtained from egg yolks from chickens stimulated with F. nucleatum. This study was to assess the effectiveness of IgY on periodontitis and halitosis caused by F. nucleatum in vitro and in vivo. The growth of F. nucleatum was inhibited (p <0. 05) by different concentrations of IgY in vitro and the results of a Halimeter show volatile sulfur compounds (VSCs) were reduced to 904 ± 57 ppb at a concentration 40 mg/ml of IgY. The changes of fatty acids of F. nucleatum were determined using GC-MS. The scores for odor index of rat saliva were decreased. The major constituent of volatile organic compounds (VOCs) including short-chain acids decreased 46.2% in 10 mg/ml IgY, ammonia decreased 70% in 40 mg/ml IgY, while aldehydes and olefine ketones were almost unchanged. The ELISA assay revealed that IL-6 and TNF-α were decreased after 4 weeks’ IgY treatment. Morphometric (X-ray) and histological analyses (HE) showed that IgY reduced alveolar bone loss and collagen fibers became orderly in rat models. As a result, IgY may have the potential to treat periodontitis and halitosis.
Impact of Synoptic Weather Types on Ground-Level Ozone Concentrations in Guangzhou, China
Wenhui Liao,Luolin Wu,Shengzhen Zhou,Xuemei Wang,Deliang Chen 한국기상학회 2021 Asia-Pacific Journal of Atmospheric Sciences Vol.57 No.2
Although precursor concentrations were reduced by emission control in Guangzhou, southern China from 2006 to 2016, ground-level O3 concentrations increased, forming potential risks to human health. This study explored the impacts of large-scale synoptic weather circulations on O3 concentration in Guangzhou, in a particular focus on high O3 pollution episodes. Twelve local weather types were clustered based on Lamb-Jenkinson weather types (LWTs). Analyses showed that LWTs strongly impacted daily O3 concentrations: A, AS, CN, and N+ weather types were likely associated with high ozone concentrations, while the ozone levels were relatively low under C, CE, CS, and S+ types. LWTs could explain 30–40% of the inter-annual variability of O3 concentration during the dry season. Numerical model simulations further demonstrated that continuous type A weather was the leading LWT correlated with high O3 concentrations, while type C weather was the predominant type correlated with low O3 concentrations. CMIP5 model results showed that occurrences of weather type A would increase by about 25% in the high emission scenario over the 2020–2069 period, which might worsen the O3 pollution in Guangzhou in the future. The increase in frequency weather type A would not be significant under the low emission scenario during the same period. Therefore, we should strictly implement the global emission reduction plan to prevent the change of weather circulation caused by climate change from aggravating ozone pollution in the future. The strong link between O3 concentrations and LWT frequencies makes the daily occurrence of LWTs a useful predictor for episodes of high O3 pollution and makes annual frequencies of LWTs good indicators of the inter-annual variability of the O3 concentration. These results are useful in efforts to predict O3 concentrations, providing a reliable weather forecast is available.
WenHui Li,LinXiao Gong,Yong Wang 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-
With the wide application of dual active bridge (DAB) DC-DC converters in high-frequency scenarios, the realization of zero voltage switching (ZVS) becomes more important for efficiency improvement. However, the existing control strategy is difficult to realize all-ZVS in medium load, which results in lower efficiency. In this paper, a partial-variable- frequency modulation scheme based on medium load frequency regulation is proposed, which could realize the all-ZVS operation. Herein, a mathematical model is proposed to regulate switching frequency and a smooth transition is achieved in the medium load, by which the all-ZVS operation can be maintained. Finally, a DAB prototype has been built to verify the validity of the theoretical analysis and the all-ZVS operation is successfully achieved in the full power range.
Performance Analysis and Implementation of a PMIPv6-Based Partially Distributed Mobility Management
Ye Wang,Wenhui Zhang,Xiaobo Li,Feng Ling 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.7
This paper provides the implementation mechanism of the pmipv6-based partially distributed mobility management (DMM) and performs extensive simulations under various traffic environments for verification and evaluation of the proposed scheme. The simulation results indicated that Mobility Anchor and Access Router (MAAR) could distribute and manage all IP data packet flow between a corresponding node (CN) and mobile node (MN). Therefore, the implementation and performance analysis of proposed mechanism is essential to understand the fundamental features of DMM, which includes a method of detecting MN and managing MN’s location.
Zhao Wenhui,Zhang Shaochong,Xue Lei,Chang Tao,Wang Liao 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.1
The confict between climate change and energy scarcity has recently gained widespread attention. The development and promotion of green power and renewable energy is an efcient strategy to address this issue. The widespread use of distributed renewable energy in microgrids results in decentralized power supply. The features of distributed power trading, such as low single transaction volume and frequent transaction intervals, present both possibilities and problems to the green electricity market. The usual centralized control and selling of power are no longer appropriate in this circumstance. This study proposes a decentralized energy transaction system architecture in the microgrid and connects the double auction mechanism to achieve the interests of each participant based on blockchain technology and the status quo green power trade in China. Finally, using the trading strategy and model, this study constructs a real and operational energy trading platform, and simulated experiments demonstrate the dependability and efcacy of the proposed trading mechanism.