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Research on UUV Recovery Active Disturbance Rejection Control Based on LMNN Compensation
Xue Du,Wenhua Wu,Wei Zhang,Shouyi Hu 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.7
As a kind of intelligent marine equipment, its successful recovery is the basis of Unmanned Underwater Vehicle (UUV)’s normal working and completing the mission successfully. However, the mathematical model of UUV is severely coupled and highly nonlinear, and may be subject to complex interference in the recovery process. Besides, the model could not be determined completely. Active disturbance rejection control (ADRC) method does not need the beforehand information of the unknown disturbance and also can ensure the stability. But conventionalADRC method with fixed parameters could not adjust to UUV complicated motion control. This paper introduces the adaptive wavelet neural network optimized by Levenberg-Marquardt algorithm, and puts forward a novel ADRC control method improved by wavelet neural network algorithm and Levenberg-Marquardt algorithm, for partial system identification and uncertain model compensation. Moreover, with pitching moment change considered in the process of UUV recovery, two dimensionless hydrodynamic coefficients are defined based on near-wall effect. The simulation experiments have been tested to verify the effectiveness of the proposed control. The results indicate that the ADRC with Levenberg-Marquardt neural network could control UUV recovery process in the variable disturbance environment more stable and reduce the ADRC computational burden.
A Study on Green Packaging Barriers Related to China’s Export
Xue-fei Du,Hyun-Sook Cho 한국무역통상학회 2021 무역통상학회지 Vol.21 No.1
Green packaging (GP), also known as sustainable packaging, which is considered to protect environment and save resources, was meeting the requirements of sustainable development. In trade area, through the important role in the ecological environment and human health, GP and its system might effect on China’s export a new trade protection measure. Here, this paper explained the definition and reimbursement of GP/GPB. It also provided packaging regulations in China’s major trading partners such as the European Union, the United States and South Korea and showed some trade cases related to packaging. Finally, in order to deal with GPBs effectively and eliminate or be weaken the impact of GPBs on China’s export trade, this paper proposed some suggestions. It is hoped that through the study of this paper, the research and development (R&D) of GP can be promoted, and the application value of GP can be exerted in China’s foreign trade and social production.
Xue Zhao,Ruina Ma,An Du,Yinan Zhang,Xue Zhao,Yongzhe Fan,Xiaoming Cao 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.7
The charge recombination caused by surface defects limits photovoltaic properties of quantum dot-sensitized solar cells (QDSSCs), which can be suppressed by modifying organic or inorganic molecules and atomic ligands. In this paper, octa-aminopropyl polyhedral oligomeric silsesquioxane (OA-POSS) connected and modified near-infrared absorption CdSeTe quantum dots (QDs) through coupling agent (1-ethyl-3-3-dimethylaminopropyl carbodiimide hydrochloride). The results suggest that OA-POSS reduces the surface defects of CdSeTe QDs and suppresses charge recombination. Therefore, the power conversion efficiency improves nearly 41%, which increases from 2.00% to 2.82%.
Packaging Framework System Under International Trade Rules
Xue-Fei Du,조현숙 강원대학교 경영경제연구소 2022 Asia-Pacific Journal of Business Vol.13 No.3
Purpose - The purpose of this study was to expound the packaging framework system(PFS) under international trade rules. Design/methodology/approach - This study analyzed packaging framework system and packaging regulations and technical standards in international regulations and major countries and classified these in some standards Findings - First, the study provides packaging provisions associated with packaging regulations and technical standards (PRTS). Then, the basis of PFS in international trade rules was proposed; it is believed that the PFS was composed of packaging legal system in WTO institutional framework (WTO-PLS), international organization packaging standard system (IO-PSS) and major countries or regions packaging regulatory system (MCR-PRS). Secondly, this paper expounded relations and legal characteristics of the three packaging systems. Finally, This study investigated PRTS coverage under technical barriers to trade (TBT) and Sanitary and Phytosanitary measures (SPS). Research implications or Originality The regulations associated with PRTS have played a key role in challenges to merchandise trade in international trade. This study has significance in classifying packaging related reticulations into several criteria unlike previous studies. Therefore it is hope that this study can provide a supplementary document for the existing research of PRTS.
Du, Wei,Ma, Xue-Lei,Zhao, Chong,Liu, Tao,Du, Yu-Liang,Kong, Wei-Qi,Wei, Ben-Ling,Yu, Jia-Yun,Li, Yan-Yan,Huang, Jing-Wen,Li, Zi-Kang,Liu, Lei Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.2
Background: MicroRNAs (miRNAs) are an abundant class of endogenous small non-coding RNAs of 20-25 nucleotides in length that function as negative gene regulators. MiRNAs play roles in most biological processes, as well as diverse human diseases including cancer. Recently, many studies investigated the association between SNPs in miR-146a rs2910164, miR-196a2 rs11614913, miR-149 rs229283, miR-499 rs3746444 and colorectal cancer (CRC), which results have been inconclusive. Methodology/Principal Findings: PubMed, EMBASE, CNKI databases were searched with the last search updated on November 5, 2013. For miR-196a2 rs11614913, a significantly decreased risk of CRC development was observed under three genetic models (dominant model: OR = 0.848, 95%CI: 0.735-0.979, P = 0.025; recessive model: OR = 0.838, 95%CI: 0.721-0.974, P = 0.021; homozygous model: OR = 0.754, 95%CI: 0.627-0.907, P = 0.003). In the subgroup analyses, miR-$196a2^*T$ variant was associated with a significantly decreased susceptibility of CRC (allele model: OR = 0.839, 95%CI: 0.749-0.940, P = 0.000; dominant model: OR = 0.770, 95%CI: 0.653-0.980, P = 0.002; recessive model: OR = 0.802, 95%CI: 0.685-0.939, P = 0.006; homozygous model: OR = 0.695, 95%CI: 0.570-0.847, P = 0.000). As for miR-149 rs2292832, the two genetic models (recessive model: OR = 1.199, 95% CI 1.028-1.398, P = 0.021; heterozygous model: OR = 1.226, 95% CI 1.039-1.447, P = 0.013) demonstrated increased susceptibility to CRC. On subgroup analysis, significantly increased susceptibility of CRC was found in the genetic models (recessive model: OR = 1.180, 95% CI 1.008-1.382, P = 0.040; heterozygous model: OR = 1.202, 95% CI 1.013-1.425, P = 0.013) in the Asian group. Conclusions: These findings supported that the miR-196a2 rs11614913 and miR-149 rs2292832 polymorphisms may contribute to susceptibility to CRC.
Case Study of the Impact of Packing Regulations and Technical Standards on Expert Trade
Xue-Fei Du,Hyun-Sook Cho 강원대학교 경영경제연구소 2021 Asia-Pacific Journal of Business Vol.12 No.3
technical standard barrier on export trade. Design/methodology/approach - This study analyzed cases related to packing in major countries such as US, EU and so on. It is also show the example of export volume changed based on PRTS. Findings - First, the role of packaging and the reason why countries issued relevant packaging provisions were introduced. Then, the impacts of PRTS on export trade were expounded. And next, we focused on investigating some PRTS related cases in export trade and gave an example of export volume changed based on PRTS. Finally, we produced implications for business leaders to aware of the importance of PRTS in export. Research implications or Originality This study provide PRTS information to traders. Trade pratitioners can respond to PRTS related regulations, actively develop PRTS technology, and take relavant to deal with PRTS barriers to eliminate or weaken the adverse effects of PRTS on export trade.
Note on the Generalized Invertibility of a-xy<sup>*</sup>
DU, FAPENG,XUE, YIFENG Department of Mathematics 2015 Kyungpook mathematical journal Vol.55 No.2
Let $\mathcal{A}$ be a unital $C^*$-algebra, a, x and y are elements in $\mathcal{A}$. In this paper, we present the expression of the Moore-Penrose inverse and the group inverse of a-$xy^*$ under the conditions $x=aa^+x,y^*=y^*a^+a$, respectively.
XUE, CHUNYAN,DU, ZENGJI,GE, WEIGAO 한국전산응용수학회 2005 Journal of applied mathematics & informatics Vol.17 No.1
In this paper, we study the third order ordinary differential equation : $$x'(t)=f(t,x(t),x'(t),x'(t)),t{\in}(0,1)$$ subject to the boundary value conditions: $$x'(0)=x'(\xi),x'(1)=^{m-3}{\Sigma}_{i=1}{{\beta}x'({\eta}i),x'(1)=0}$$. Here ${\beta}_{i}{\in}R,\;^{m-3}{\Sigma}_{i=1}\;{\beta}_{i}\;=\;1,\;0<{\eta}_1<{\eta}_2<{\cdots}<{\eta}_{m-3}<1,\;0<\xi<1$. This is the case dimKer L = 2. When the ${\beta}_i$ have different signs, we prove some existence results for the m-point boundary value problem at resonance by use of the coincidence degree theory of Mawhin [12, 13]. Since all the existence results obtained in previous papers are for the case dimKerL = 1, our work is new.