Optimized Geometric LDPC Codes with Quasi-Cyclic Structure

Xueqin Jiang,이문호,Shangce Gao,Yun Wu 한국통신학회 2014 Journal of communications and networks Vol.16 No.3

This paper presents methods to the construction of regularand irregular low-density parity-check (LDPC) codes based onEuclidean geometries over the Galois field. Codes constructed bythese methods have quasi-cyclic (QC) structure and large girth. Bydecomposing hyperplanes in Euclidean geometry, the proposed irregularLDPC codes have flexible column/row weights. Therefore,the degree distributions of proposed irregular LDPC codes can beoptimized by technologies like the curve fitting in the extrinsic informationtransfer (EXIT) charts. Simulation results show that theproposed codes perform very well with an iterative decoding overthe AWGN channel.

Microgrid Fault Diagnosis Based on Whale Algorithm Optimizing Extreme Learning Machine

Wu Zhongqiang,Lu Xueqin 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.3

A microgrid fault diagnosis method based on whale algorithm optimizing extreme learning machine (ELM) is proposed. Firstly, the three-phase fault voltage is analyzed by wavelet packet decomposition, and the feature vector composed of wavelet packet energy entropy is calculated as data samples. Then, a whale algorithm is used to optimize the extreme learning machine to establish a diagnostic model to identify and diagnose the fault type of microgrid. The whale algorithm has the characteristics of simple parameter setting, fast learning speed, and strong global optimization ability. The whale algorithm is used to optimize the input weights and hidden layer neuron thresholds of the extreme learning machine, which solves the problem that the random initialization of the input weights and hidden layer neuron thresholds easily afects the network performance, which can further improve the learning speed and generalization ability of the network, and beneft to global optimization. Simulation results show that compared with BP neural network, RBF neural network and ELM, the fault diagnosis model based on whale algorithm optimization extreme learning machine has faster learning speed, stronger generalization ability and higher recognition accuracy

肥胖青少年健康素养研究进展

严雪琴(Xueqin Yan),刘薇薇(Weiwei Liu),雷迅(Xun Lei),吴成斌(Chengbin Wu) 아시아사회과학학회 2023 International Science Research Vol.3 No.1

The incidence of obesity has risen rapidly in the world, and the occurrence and development of obesity is closely related to the “three high” problem of adolescents after adulthood, which has become one of the most serious public health problems. China's teenagers are not only facing the problem of obesity, but also lack understanding of health-related knowledge, and their health literacy needs to be improved. Based on the analysis of the epidemic trend of adolescent obesity, this paper focuses on the relevant factors affecting the health literacy of obese adolescents, and puts forward countermeasures from the four levels of the country, school, family and individual, in order to improve and enhance their health literacy level, and provide theoretical basis for achieving the overall goal of national health.

Hepatoprotective effect of phenylethanoid glycosides from Incarvillea compacta against CCl4-induced cytotoxicity in HepG2 cells

Ting Shen,Xueqin Li,Weicheng Hu,Lijin Zhang,Xudong Xu,Haifeng Wu,Lilian Ji 한국응용생명화학회 2015 Applied Biological Chemistry (Appl Biol Chem) Vol.58 No.4

The extraction and solvent partition of roots of Incarvillea compacta, a traditional Tibetan folk medicine, and repeated column chromatography and preparative high-performance liquid chromatography for n-butanol fraction yielded four phenylethanoid glycosides, crenatoside (1), 3000-O-methylcrenatoside (2), leucoseceptoside A (3), and martynoside (4). The chemical structures were identified on the basis of spectroscopic data analyses including NMR and MS. All compounds were isolated for the first time from the plant. Compound 1 exerted better 1,1-diphenyl-2-picrylhydrazyl free radical scavenging activity. In addition, compounds 1–4 were evaluated for their hepatoprotective activity on carbon tetrachloride (CCl4)- induced liver injury in HepG2 cells. Pretreatment of HepG2 cells with compound 1–4 significantly increased the viability on CCl4-induced cell death. Furthermore, compounds 1–4 also alleviated CCl4-induced hepatotoxicity by enhancement of the antioxidant enzyme activities of superoxide dismutase and reduction of the malondialdehyde content, intracellular ROS as well as NF-jB transactivation. Our results suggest that phenylethanoid glycosides ameliorate CCl4-induced cell injury, and this protection was likely due to antioxidative activity and down-regulation of NF-jB.

Temperature characteristics of indentation rolling resistance of belt conveyor

Lidong Zhou,Zengfa Wu,Yongchao Li,Huiqiang Yao,Yuan Liu,Yuan Yuan,Wenjun Meng,Liangliang Han,Xueqin Cao 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.8

In order to study the influence of temperature on the indentation rolling resistance of belt conveyor, theoretical analysis, numerical simulation analysis and experimental study of conveyor belt indentation rolling resistance with temperature characteristics were carried out in this paper, and the influence rules of different factors on the indentation rolling resistance of belt conveyor were obtained. First, the three-component Maxwell model is chosen as the viscoelastic model for the conveyor belt rubber material, and the viscoelastic modulus function based on temperature effects is constructed from the DMA experimental data fitting. Second, we introduce the one-dimensional Winkler foundation model to derive a mathematical expression for the indentation rolling resistance based on temperature properties. Then, a mathematical model of the indentation rolling resistance of a conveyor belt with temperature characteristics is developed in MATLAB and numerical simulations are performed. Finally, using the existing experimental equipment to conduct experiments, the experimental results are compared with the numerical simulation result. The results show that the theoretical numerical simulation results of the indentation rolling resistance with temperature effect presented in this paper have a consistent change trend with the experimental results; at constant temperature and constant load, the indentation rolling resistance increases with increasing band velocity; at constant temperature and constant velocity, the indentation rolling resistance increases with increasing load; at constant load and speed, when the temperature is lower than 0 °C or higher than 25 °C, the rolling resistance increases with the increase of temperature, when the temperature is between 0 °C and 25 °C, the rolling resistance decreases gradually with the increase of temperature.

Study on Choice of Diversified R&D Investment Types

Chem Haisheng,Jiang Xueqin,Li Zhuotao,Wu Chendi 인하대학교 정석물류통상연구원 2009 인하대학교 정석물류통상연구원 학술대회 Vol.2009 No.10

Initially this paper introduces the trends of the diversified R&D investment types as well as the basic characteristics of the R&D investment. Then it proves by empirical test that businesses may have greater effects by adopting diversified investment types than single investment type. At the same time it also indicates that the difficulty of R&D investment has increased. In order to improve the efficiency of diversified investment choice, in this paper we detail factors such as market, enterprise, technology, which influence the types of R&D investment choice, and make a conclusion of each influencing factors as well.

Hepatoprotective effect of phenylethanoid glycosides from Incarvillea compacta against CCl₄-induced cytotoxicity in HepG2 cells

Shen, Ting,Li, Xueqin,Hu, Weicheng,Zhang, Lijin,Xu, Xudong,Wu, Haifeng,Ji, Lilian 한국응용생명화학회 2015 Applied Biological Chemistry (Appl Biol Chem) Vol.58 No.4

The extraction and solvent partition of roots of Incarvillea compacta, a traditional Tibetan folk medicine, and repeated column chromatography and preparative high-performance liquid chromatography for n-butanol fraction yielded four phenylethanoid glycosides, crenatoside (1), 3'''-O-methylcrenatoside (2), leucoseceptoside A (3), and martynoside (4). The chemical structures were identified on the basis of spectroscopic data analyses including NMR and MS. All compounds were isolated for the first time from the plant. Compound 1 exerted better 1,1-diphenyl-2-picrylhydrazyl free radical scavenging activity. In addition, compounds 1-4 were evaluated for their hepatoprotective activity on carbon tetrachloride ($CCl_4$)-induced liver injury in HepG2 cells. Pretreatment of HepG2 cells with compound 1-4 significantly increased the viability on $CCl_4$-induced cell death. Furthermore, compounds 1-4 also alleviated $CCl_4$-induced hepatotoxicity by enhancement of the antioxidant enzyme activities of superoxide dismutase and reduction of the malondialdehyde content, intracellular ROS as well as NF-${\kappa}B$ transactivation. Our results suggest that phenylethanoid glycosides ameliorate $CCl_4$-induced cell injury, and this protection was likely due to antioxidative activity and down-regulation of NF-${\kappa}B$.

儿童友好型城市建设背景下意外伤害防控体系的构建策略

何姗(Shan He),严雪琴(Xueqin Yan),伍颖(Ying Wu),杨倩茹(Qianru Yang),刘薇薇(Weiwei Liu) 아시아사회과학학회 2023 International Science Research Vol.3 No.1

International researches on the relationship between children and cities, the impact of urban environment on children's body and mind, and how to build a child friendly city have reached a certain depth. At present, the construction of child friendly cities in China is still in its infancy. Among them, the urban spatial planning involving children has not been in-depth, and the disease burden caused by falls and road traffic injuries is still high. In view of the problems existing in the built environment of the city, we should carry out the construction of a child friendly city, pay attention to the safety guarantee of children's activity space, formulate targeted accidental injury prevention and control measures, and promote the inclusive sharing of children's medical and health service resources, high-quality and balanced development.

Anti-inflammation compounds from the seedpods of Pongamia pinnata (L.) Pierre guided by the bioactivity and UPLCHRESIMS

Hong Guo,Zisong Bai,Yangyang Xu,Xueqin Wu,Ning Li,Yan Zhu,Xiaoming Wang,Peng Zhang 대한약학회 2017 Archives of Pharmacal Research Vol.40 No.7

Pongamia pinnata (Linn.) Pierre has anti-inflammatory activity and could significantly decrease serum tumor necrosis factor-a and IL-10 in arthritic rats. Previous research indicated the typical chemical constituent in P. pinnata is furanoflavone. Guided by anti-inflammatory active assay and UPLC-HRESIMS chromatography, 22 compounds were isolated from the ethanol extract of P. pinnata seedpods. One novel furanoflavone, 40-hydroxypinnatin, was elucidated by HRESIMS, 1D- and 2D-NMR spectra. The 21 known compounds, including 9 furanoflavone, were identified by comparing their NMR data with the previous data in reference. In the known compounds, 5 were isolated for the first time from the species. The anti-inflammatory activities were assayed by assessing LPS-induced NO production in BV-2 cells. 12 compounds can inhibit the production of NO without cytotoxicity at concentration of 50 lM. Among them, compounds 4 can significantly inhibit the production of NO, with the IC50 value of 31.36 lM.