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An Improved Classification Model Based on Feature Fusion for Orchid Species
Wang Jianhua,Wang Haozhan,Long Yongbing,Lan Yubin 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.3
Orchid is a kind of terrestrial herb and it has elegant fower posture, quiet fower fragrance, rich colors and noble moral, therefore it has high ornamental value and is deeply loved by people. There are many kinds of orchids, and some of them are similar in shape, texture and color, which make people difcult to quickly and correctly distinguish them. As the existing classifcation model of orchid species have the problems of low accuracy rate and long classifcation time because of the inter species similarities and intra species diferences in orchid species, thus infuencing its wide application. In order to solve the problem above, in this paper, an improved classifcation model based on feature fusion is proposed for orchid species. The achievement of the paper lies in the fact that we successfully developed a classifcation model based on feature fusion to realize the high-efcient classifcation for orchid species. Specifcally, in our scheme, frstly we obtained 12 orchid image sets with number of 12,227 images by network and feld photography; Secondly we analyzed and studied the semantic relationship of diferent scale features from acquired orchid images above; Thirdly we designed an improved classifcation model based on feature fusion on the basis of the semantic relationship above; At last, we used the classifcation model above to realize the high-efcient classifcation for 12 orchid species. The experimental results showed that our proposed classifcation model based on feature fusion in this paper can realize 92.98% classifcation accuracy rate compared with classifcation models without using feature fusion technology, which can greatly improve the classifcation efciency for orchid species.
Wang, Shenhong,Wang, Yubin,Wang, Fan The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.11
A low current ripple high step-up interleaved boost converter with switched-capacitors and switched-inductors that can be used in renewable resources such as photovoltaic energy and fuel cells is studied in this paper. In the proposed converter, the voltage gain is significantly increased and the voltage stresses of the switches are reduced by applying two switched-inductor units to replace individual inductors and by adding a switched-capacitor network to the output side. In addition, the current ripple of the inductor branch is reduced with the help of introducing a coupled-inductor, while the dynamic response speed remains almost unchanged. Therefore, smaller inductors can be used to reduce the volume of the converter. In this paper, the operating principles; the steady-state performance including the voltage gain, the voltage stresses of the switching devices, and the current ripple of the inductor; and transient-state performance of the proposed topology are analyzed. Moreover, the design criteria of the coupled-inductor are given in detail, and the double closed-loop PI controllers are designed. Finally, experimental results are given for a 160 W, 18 V input to 240 V output prototype. These results verify the correctness of the theoretical analysis. In addition, the efficiency analysis and power calculations are also discussed.
Esterification of free fatty acids in a rotor-stator spinning disc reactor
Yubin Wang,Xiaoqiu Tao,Jun Li,Siqi Zhang,Yang Jin,Ming Chen 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.8
Fatty acid methyl esters (FAMEs) were produced by the esterification of free fatty acids (FFA) with methanol, and sulfuric acid as the catalyst in a rotor-stator spinning disc reactor (RSSDR). The RSSDR, which shows excellent mixing efficiency and fast phase separation, was used as a novel continuous-flow esterification reactor. The influence of the variables (e.g., rotational speed, volume flow rate, rotor-stator distance, methanol-FFA molar ratio, catalyst dosage, and temperature) on esterification conversion () and productivity of FAMEs (PFAME) were investigated. It was found that the experimental parameters have a great impact on the and PFAME in the RSSDR system, due to the effect of micromixing intensity and residence time distribution. Furthermore, to compare with other traditional esterification reactors, the values of , PFAME, and PFAME per unit reactor volume (PFAME/VR) in the RSSDR were also employed to assess the performance for the production of FAMEs. It shows that the maximum values of PFAME, and PFAME/VR attained were 0.14mol/min and 3.06×102 mol/(mL min), respectively. Therefore, the RSSDR is proven to be an effective esterification reactor with high esterification conversion in comparison to conventional esterification reactors.
Research on Cloud Manufacturing Resource Allocation in Distributed Computing Environment
Yubin Wang,Jingyi Bo,Guolin Li 보안공학연구지원센터 2015 International Journal of Grid and Distributed Comp Vol.8 No.3
With the rapid development of network information technology, manufacturing presents a development trend of networking, virtualization, intelligence and servitization. Cloud manufacturing (CMg) with a new type of service-oriented manufacturing model is put forward and excellently satisfies the development requirements of modern manufacturing enterprises. With considering the complex characteristics of cloud manufacturing, firstly, we construct Cloud manufacturing resource scheduling system architecture to schedule service task and allocate manufacturing resource, which includes user requirements, task plan, global task scheduling, service collaboration allocation, virtualization and cloud manufacturing resource. Secondly, we propose a comprehensive resource allocation model based on auctions theory to satisfy different users’ request, and then the greedy method is used to search the optimal bid in the bid set. Finally, we implement some simulation experiments, and simulation results show that the solution algorithm of CARA’s winner determination problem gets the same solution as the M-HEU algorithm with less time complexity, and it is more applicable, efficient and effective for online multi-resource allocation.
Fan Wang,Yubin Wang,Menghan Chu,Chuhao Gao 전력전자학회 2024 JOURNAL OF POWER ELECTRONICS Vol.24 No.4
High-gain converters have been used on many occasions as interfaces for multiple energy conversions. Among these converters, a family of switching-capacitor high-gain converters is widely used due to its low cost, small volume, low loss, spontaneous capacitor voltages balance, and spontaneous inductor currents average. However, one or more of the switches in these converters suffer from the issue of withstanding higher voltage stresses than the other switches, which may limit the applications of these converters at high voltages. To solve this issue, a general method for reducing the switching voltage stresses for this high-gain converter family is proposed. This method can improve many kinds of high-gain converters, which can reduce the switching voltage stresses. Based on this method, a two-phase low-stress high-gain converter is proposed. The voltage stresses of all the switches in the proposed converter do not exceed half of the output voltage of the converter. Then, based on the proposed converter feature, a control method is proposed that can make the proposed converter have the automatic capacitor voltage balancing characteristic without an extra voltage-loop control. Finally, the proposed method is verified by prototype experiments.
Qihong Xian,Yubin Wang,Fan Wang,Ruixin Li,Song Wang 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.2
In a DC microgrid, the negative damping characteristics of a constant power load can deteriorate the stability of the whole system. To improve the robustness and stability of the DC microgrid, a hybrid passivity-based control of damping injection is presented in this paper. The stability of the closed-loop system is ensured by the energy dissipation property of the passivity-based control. A proportional-integral controller is integrated with the passivity-based controller to form a hybrid passivity-based control to improve control robustness. A small-signal model of a DC power system with constant power load is derived in detail, and the stability of the system is analyzed with the Lyapunov eigenvalue method. The proposed hybrid passivity-based control provides the system with a faster recovery and a larger power boundary when compared with the typical voltage-current dual-loop control. First, the proposed control is verified by simulation of the DC power system based on MATLAB/Simulink, and the feasibility and superiority of the proposed control are further verified by hardware-in-loop (HIL) experiments based on real-time laboratory (RT-Lab) and a TI DSP TMS320 F28335.