Infuence of Diferent XLPE Cable Defects on the Initiation of Electric Trees

Fei Qi,Dai Wan,Xi OuYang,Qian Jiang,Miao Zhao,Hengyi Zhou 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.6

Defects in the insulation layer of cross-linked polyethylene (XLPE) cable are the leading cause of electrical tree. The mechanism that how the diferent insulation defects infuence on the starting of electrical tree should be explored, and it will be utilized to improve cable insulation in the production and installation. In the paper, frstly the spike-air gap defect as the main defect characteristics of cable fault has been determined by analyzing the actual cable defect type and infuence. Then, the needle-electrode short cable test system was built and the representative defect model was constructed, in order to simulate the infuence of the spike-air gap defect of diferent sizes in the outer semiconductor layer on the initial voltage of electrical tree. Thirdly, the Physical model was created to analyze the infuence of each defect parameters. The research showed that the electrical tree of XLPE cable was mainly caused by defects in the semiconductor layer. The maximum electric feld distribution can be formulized by the maximum feld strength Mason model. According to the formulation and the test results, the main parameters, including the spur curvature, the micro-pore pressure and the initial energy of generating electric tree, have a positive promotion on the initial voltage of the electrical tree and can hinder the tree developing. Therefore, utilizing the interface treatment method between the insulation layer and the semiconductor layer, the insulation heat treatment process and the flling of the inert gas are to improve the parameters and further resist electrical tree aging in the production and installation.

Anti-domestic violence law: The fight for women’s legal rights in China

Fei Qi,Yuqi Wu,Wang Qi 이화여자대학교 아시아여성학센터 2020 Asian Journal of Women's Studies(AJWS) Vol.26 No.3

In China, the definition of domestic violence is usually limited to direct physical and mental harm to family members. About a quarter of Chinese families have been reportedly affected by domestic violence to different degrees, with most victims being women who have lacked effective legal protection for a long time. In response, Chinese feminists advocated the implementation of the Anti-domestic Violence Law (ADVL). Through judicial reforms, the Supreme Court of China has urged local courts at all levels to establish Family Law Divisions so that they can implement the provisions of ADVL better. However, due to compromises made before it was finalized and the restrictions of the Chinese legal system, its effectiveness is still limited, making it difficult for Chinese female victims of domestic violence to obtain sufficient support from the courts. The process Chinese feminists have undertaken to put forward their ideas regarding this Law has only just begun.

Application of Biomarkers for the Prediction and Diagnosis of Bone Metastasis in Breast Cancer

Feiqi Liu,Jianji Ke,Yanqiu Song 한국유방암학회 2020 Journal of breast cancer Vol.23 No.6

The most common metastatic site of breast cancer is the bone. Metastatic bone disease can alter the integrity of the bone and cause serious complications, thereby greatly reducing health-related quality of life and leading to high medical costs. Although diagnostic methods and treatments for bone metastases (BM) are improving, some patients with early breast cancer who are at high risk of BM are not diagnosed early enough, leading to delayed intervention. Moreover, whole-body scintigraphy cannot easily distinguish BM from nonmalignant bone diseases. To circumvent these issues, specific gene and protein biomarkers are being investigated for their potential to predict, diagnose, and evaluate breast cancer prognosis. In this review, we summarized the current biomarkers associated with BM in breast cancer and their role in clinical applications to assist in the diagnosis and treatment of BM in the future.

Robust Guaranteed Cost Control for Uncertain Stochastic Fuzzy Systems with Aperiodic Sampled-data Based on Hybrid Modeling

Shuqi Li,Feiqi Deng,Jing Xiao 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.5

This paper aims at exploring the effective technique to analyze and synthesize the discrete feedback problem. It is particularly concerned with the robust guaranteed cost sampled fuzzy control problem of uncertain stochastic T-S fuzzy systems. Firstly, we propose the improved hybrid modeling technique to cope with sampled control input so that the premise mismatching problem of the stochastic fuzzy systems and fuzzy controllers can be well solved. Then, we provide the improved time-varying Lyapunov function method to analyze the remodeled special stochastic fuzzy impulsive problems which the spectral radius of impulsive gains are not less than 1. With this method, the control synthesis problem can be addressed rather than given the control gains in former hybrid modeling results. Finally, a numerical experiment is used to verify the effectiveness of our results. From the simulation results, we see that the hybrid modeling technique can get larger upper bound of the sampling intervals than results in existing modeling technique.

Robust mixed H_2/H_∞ guaranteed cost control of uncertain stochastic neutral systems

Weihua Mao,Feiqi Deng,Anhua Wan 한국전산응용수학회 2012 Journal of applied mathematics & informatics Vol.30 No.5

In this paper, we deal with the robust mixed $H_2\hbox{/}H_{\infty}$ guaranteed-cost control problem involving uncertain neutral stochastic distributed delay systems. More precisely, the aim of this problem is to design a robust mixed $H_2\hbox{/}H_{\infty}$ guaranteed-cost controller such that the close-loop system is stochastic mean-square exponentially stable, and an $H_2$ performance measure upper bound is guaranteed, for a prescribed $H_{\infty}$ attenuation level $\gamma$. Therefore, the fast convergence can be fulfilled and the proposed controller is more appealing in engineering practice. Based on the Lyapunov-Krasovskii functional theory, new delay-dependent sufficient criteria are proposed to guarantee the existence of a desired robust mixed $H_2\hbox{/}H_{\infty}$ guaranteed cost controller, which are derived in terms of linear matrix inequalities (LMIs). Furthermore, the design problem of the optimal robust mixed $H_2\hbox{/}H_{\infty}$ guaranteed cost controller, which minimized an $H_2$ performance measure upper bound, is transformed into a convex optimization problem with LMIs constraints. Finally, two simulation examples illustrate the design procedure and verify the expected control performance.

ROBUST MIXED $H_2/H_{\infty}$ GUARANTEED COST CONTROL OF UNCERTAIN STOCHASTIC NEUTRAL SYSTEMS

Mao, Weihua,Deng, Feiqi,Wan, Anhua The Korean Society for Computational and Applied M 2012 Journal of applied mathematics & informatics Vol.30 No.5

In this paper, we deal with the robust mixed $H_2/H_{\infty}$ guaranteed-cost control problem involving uncertain neutral stochastic distributed delay systems. More precisely, the aim of this problem is to design a robust mixed $H_2/H_{\infty}$ guaranteed-cost controller such that the close-loop system is stochastic mean-square exponentially stable, and an $H_2$ performance measure upper bound is guaranteed, for a prescribed $H_{\infty}$ attenuation level ${\gamma}$. Therefore, the fast convergence can be fulfilled and the proposed controller is more appealing in engineering practice. Based on the Lyapunov-Krasovskii functional theory, new delay-dependent sufficient criteria are proposed to guarantee the existence of a desired robust mixed $H_2/H_{\infty}$ guaranteed cost controller, which are derived in terms of linear matrix inequalities(LMIs). Furthermore, the design problem of the optimal robust mixed $H_2/H_{\infty}$ guaranteed cost controller, which minimized an $H_2$ performance measure upper bound, is transformed into a convex optimization problem with LMIs constraints. Finally, two simulation examples illustrate the design procedure and verify the expected control performance.