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Optimal overcurrent relay coordination in distribution network based on Lightning Flash Algorithm EI SCIE Scopus
期刊论文 | 2018 , 35 (3) , 1140-1160 | ENGINEERING COMPUTATIONS
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Abstract :

Purpose Distribution network protection is a complicated problem and mal-operation of the protective relays due to false settings make the operation of the network unreliable. Besides, obtaining proper settings could be very complicated. This paper aims to discuss an innovative evolutionary Lightning Flash Algorithm (LFA) which is developed for solving the relay coordination problems in distribution networks. The proposed method is inspired from the movements of cloud to ground lightning strikes in a thunderstorm phenomenon. LFA is applied on three case study systems including ring, interconnected and radial distribution networks. The power flow analysis is performed in Digsilent Power Factory software; then the collected data are sent to MATLAB software for optimization process. The proposed algorithm provides optimum time multiplier setting and plug setting of all digital overcurrent relays in each system. The results are compared with other methods such as particle swarm optimization and genetic algorithm. The result comparisons demonstrate that the proposed LFA can successfully obtain proper relay settings in distribution networks with faster speed of convergence and lower total operation time of relays. Also, it shows the superiority and effectiveness of this method against other algorithms. Design/methodology/approach A novel LFA is designed based on the movements of cloud to ground lightning strikes in a thunderstorm. This method is used to optimally adjust the time multiplier setting and plug setting of the relays in distribution system to provide a proper coordination scheme. Findings The proposed algorithm was tested on three case study systems, and the results were compared with other methods. The results confirmed that the proposed method could optimally adjust the relay settings in the electric distribution system to provide a proper protection scheme. Practical implications The practical implications can be conducted on distribution networks. The studies provided in this paper approve the practical application of the proposed method in providing proper relay protection in real power system. Originality/value This paper proposes a new evolutionary method derived from the movements of cloud to ground lightning strikes in thunderstorm. The proposed method can be used as an optimization toolbox to solve complex optimization problems in practical engineering systems.

Keyword :

Optimization Overcurrent relay coordination Overcurrent relay Time multiplier setting Distribution network Lightning Flash Algorithm Plug setting

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GB/T 7714 Kheshti, Mostafa , Kang, Xiaoning . Optimal overcurrent relay coordination in distribution network based on Lightning Flash Algorithm [J]. | ENGINEERING COMPUTATIONS , 2018 , 35 (3) : 1140-1160 .
MLA Kheshti, Mostafa 等. "Optimal overcurrent relay coordination in distribution network based on Lightning Flash Algorithm" . | ENGINEERING COMPUTATIONS 35 . 3 (2018) : 1140-1160 .
APA Kheshti, Mostafa , Kang, Xiaoning . Optimal overcurrent relay coordination in distribution network based on Lightning Flash Algorithm . | ENGINEERING COMPUTATIONS , 2018 , 35 (3) , 1140-1160 .
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Red Blood Cell Detection by the Improved Two-Layer Watershed Segmentation Method with a Full Convolutional Neural Network SCIE
期刊论文 | 2018 , 8 (1) , 50-54 | JOURNAL OF MEDICAL IMAGING AND HEALTH INFORMATICS
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Abstract :

Identifying cells in an image (cell segmentation) is essential for quantitative single-cell biology. The development of automatic medical image analysis of erythrocyte morphology has simplified the diagnosis of many diseases and combined a good reliability with high performance. However, in computational molecular biology, the elaboration of reliable and fully automated image analysis techniques for red blood cells imaging is still quite problematic. In this respect, quite lucrative is the watershed transformation concept, which can be utilized in image segmentation to generate partitions of the image corresponding to objects of interest. This approach is used in the current study, which presents a two-layer red blood cells detection framework, including a full convolutional neural network to extract the candidate cell regions with about 97% accuracy rate, and a novel labeled watershed method based on the morphology label and conditional skeleton extraction for improving the overlapped cells' segmentation. It is shown that the proposed method successfully extracts the red blood candidate regions, including single and overlapped ones. A comparative analysis of the proposed detection method and several other general methods was performed. The experimental results obtained indicate that the proposed framework is robust and accurate, with the cell extracting ratio over 87.76% accuracy.

Keyword :

Full Convolutional Neural Network Red Blood Cells Cell Segmentation Conditional Skeleton Watershed Algorithm

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GB/T 7714 Jiang, Peilin , Zhang, Xuetao , Wang, Fei . Red Blood Cell Detection by the Improved Two-Layer Watershed Segmentation Method with a Full Convolutional Neural Network [J]. | JOURNAL OF MEDICAL IMAGING AND HEALTH INFORMATICS , 2018 , 8 (1) : 50-54 .
MLA Jiang, Peilin 等. "Red Blood Cell Detection by the Improved Two-Layer Watershed Segmentation Method with a Full Convolutional Neural Network" . | JOURNAL OF MEDICAL IMAGING AND HEALTH INFORMATICS 8 . 1 (2018) : 50-54 .
APA Jiang, Peilin , Zhang, Xuetao , Wang, Fei . Red Blood Cell Detection by the Improved Two-Layer Watershed Segmentation Method with a Full Convolutional Neural Network . | JOURNAL OF MEDICAL IMAGING AND HEALTH INFORMATICS , 2018 , 8 (1) , 50-54 .
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Dark ring soliton in two-dimensional nonlinear self-defocusing medium EI SCIE Scopus
期刊论文 | 2018 , 156 , 447-452 | OPTIK
WoS CC Cited Count: 1
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Abstract :

We investigate the control of dark ring solitons with multi-layer ring-shapes, which are the one- and two-soliton solutions of the Korteweg-de Vries (KdV) equation. By using the reductive perturbation method, a cylindrical KdV equation for the two-dimensional self-defocusing nonlinear Schrodinger (NLS) equation is obtained, which possesses dark soliton solutions. By picking different orders of solutions of the KdV equation, the profiles of the intensity of the dark nonlinear waves display multi-layer ring-shapes, and can be controlled by the initial phase and the amplitude. Our results are expected to provide a theoretical basis for the control of dark ring solitons in nonlinear medium. (C) 2017 Elsevier GmbH. All rights reserved.

Keyword :

Dark ring soliton 2D self-defocusing NLS equation Korteweg-de Vries equation

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GB/T 7714 Yang, Zhengping , Zhong, Wei-Ping , Belic, Milivoj et al. Dark ring soliton in two-dimensional nonlinear self-defocusing medium [J]. | OPTIK , 2018 , 156 : 447-452 .
MLA Yang, Zhengping et al. "Dark ring soliton in two-dimensional nonlinear self-defocusing medium" . | OPTIK 156 (2018) : 447-452 .
APA Yang, Zhengping , Zhong, Wei-Ping , Belic, Milivoj , Zhang, Yiqi . Dark ring soliton in two-dimensional nonlinear self-defocusing medium . | OPTIK , 2018 , 156 , 447-452 .
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Fraction-Dimensional Accessible Solitons in a Parity-Time Symmetric Potential EI SCIE Scopus
期刊论文 | 2018 , 530 (2) | ANNALEN DER PHYSIK
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Abstract :

By using the modified Snyder-Mitchell (MSM) model, which can describe the propagation of a paraxial beam in fractional dimensions (FDs), we find the exact "accessible soliton solutions in the strongly nonlocal nonlinear media with a self-consistent parity-time (PT) symmetric complex potential. The exact solutions are constructed with the help of two special functions: the complex Gegenbauer and the generalized Laguerre polynomials in polar coordinates, parametrized by two nonnegative integer indices - the radial and azimuthal mode numbers (n,m), and the beam modulation depth. By the choice of different soliton parameters, the intensity and angular profiles display symmetric and asymmetric structures. We believe that it is important to explore the MSM model in FDs and PT-symmetric potentials, for a better understanding of nonlinear FD physical phenomena. Different physical systems in which the model might be of relevance are briefly discussed.

Keyword :

spatial solitons beam propagation nonlinear optics transverse effects

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GB/T 7714 Zhong, Wei-Ping , Belic, Milivoj R. , Zhang, Yiqi . Fraction-Dimensional Accessible Solitons in a Parity-Time Symmetric Potential [J]. | ANNALEN DER PHYSIK , 2018 , 530 (2) .
MLA Zhong, Wei-Ping et al. "Fraction-Dimensional Accessible Solitons in a Parity-Time Symmetric Potential" . | ANNALEN DER PHYSIK 530 . 2 (2018) .
APA Zhong, Wei-Ping , Belic, Milivoj R. , Zhang, Yiqi . Fraction-Dimensional Accessible Solitons in a Parity-Time Symmetric Potential . | ANNALEN DER PHYSIK , 2018 , 530 (2) .
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Protective effect of neferine against UV-B-mediated oxidative damage in human epidermal keratinocytes SCIE PubMed Scopus
期刊论文 | 2018 , 29 (7) , 733-741 | JOURNAL OF DERMATOLOGICAL TREATMENT
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Background: Studies have shown that skin exposure to ultraviolet radiation (UVR) results in the formation of reactive oxygen species (ROS), thus altering the cellular function. The human epidermal skin layer is mainly composed of keratinocytes, which is damaged by UV-B radiation-induced intracellular oxidative stress. Neferine is an alkaloid extract from lotus seed embryos and is known to promote antioxidant activity.Objective: In this study for the first time, we investigated the photoprotective action of neferine, against UV-B-produced oxidative damage in human epidermal keratinocytes (HEKs).Methods: We established an in Vitro study model using HEKs. Cellular viability was determined by MMT assay kits. The intracellular oxidative stress was measured using ROS and malondialdehyde (MDA) assay kits. Endogenous antioxidants were measured by superoxide dismutase (SOD) and glutathione peroxidase (GPx) assay kits. Photoprotective nature of neferine was further evaluated by analyzing the morphological and ultrastructural alterations in keratinocytes.Results: Neferine inhibit the UV-B-mediated increase in ROS and MDA levels in pretreated keratinocytes. The antioxidants, SOD and GPx activities were significantly high in neferine pretreated UV-B groups. Mitochondrial and endoplasmic reticulum damage were less evident in neferine-pretreated UV-B groups as compared with the control group, which might be associated with reduced oxidative stress and lipid peroxidation.Conclusion: Taken together, our results suggest that neferine can prevent UV-B-induced oxidative damage and may thus be a potential agent for prevention and treatment of skin damage and photoaging.

Keyword :

human epidermal keratinocytes Neferine antioxidant oxidative stress ultraviolet B photoaging

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GB/T 7714 Khan, Abidullah , Bai, Hongliang , Liu, Enqi et al. Protective effect of neferine against UV-B-mediated oxidative damage in human epidermal keratinocytes [J]. | JOURNAL OF DERMATOLOGICAL TREATMENT , 2018 , 29 (7) : 733-741 .
MLA Khan, Abidullah et al. "Protective effect of neferine against UV-B-mediated oxidative damage in human epidermal keratinocytes" . | JOURNAL OF DERMATOLOGICAL TREATMENT 29 . 7 (2018) : 733-741 .
APA Khan, Abidullah , Bai, Hongliang , Liu, Enqi , Chen, Mingxia , Yu, Chunshui , Wang, Rui et al. Protective effect of neferine against UV-B-mediated oxidative damage in human epidermal keratinocytes . | JOURNAL OF DERMATOLOGICAL TREATMENT , 2018 , 29 (7) , 733-741 .
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Localized Airy Wave Packets in a Self-Defocusing Kerr Medium EI SCIE Scopus
期刊论文 | 2018 , 10 (2) | IEEE PHOTONICS JOURNAL
WoS CC Cited Count: 1
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Families of vortex-like and Gaussian-like localized Airy wave packets, propagating in a self-defocusing Kerr medium, are discovered. Their propagation is described by the cylindrical Korteweg-de Vries (CKdV) equation, reduced from the nonlinear Schrodinger equation by utilizing the reductive perturbation technique. The CKdV equation is solved using the Hirota bilinear method to obtain analytical Airy wave packet families of different order. In particular, we focus on the distribution of optical intensity via numerical simulations of the Airy wave packet solutions, obtained for different initial phases and amplitudes, at given propagation distances. In distinction to the usual ring solitons, the Airy wave packets display a novel internal structure, which reveals novel nonlinear phenomena during the propagation of packets.

Keyword :

Vortex-like and Gaussian-like Airy spatial local wave packets. The 2D NLS equation CKdV equation

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GB/T 7714 Zhong, Wei-Ping , Belic, Milivoj , Zhang, Yiqi . Localized Airy Wave Packets in a Self-Defocusing Kerr Medium [J]. | IEEE PHOTONICS JOURNAL , 2018 , 10 (2) .
MLA Zhong, Wei-Ping et al. "Localized Airy Wave Packets in a Self-Defocusing Kerr Medium" . | IEEE PHOTONICS JOURNAL 10 . 2 (2018) .
APA Zhong, Wei-Ping , Belic, Milivoj , Zhang, Yiqi . Localized Airy Wave Packets in a Self-Defocusing Kerr Medium . | IEEE PHOTONICS JOURNAL , 2018 , 10 (2) .
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Controllable optical rogue waves via nonlinearity management EI SCIE Scopus
期刊论文 | 2018 , 26 (6) , 7587-7597 | OPTICS EXPRESS
WoS CC Cited Count: 1
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Abstract :

Using a similarity transformation, we obtain analytical solutions to a class of nonlinear Schrodinger (NLS) equations with variable coefficients in inhomogeneous Kerr media, which are related to the optical rogue waves of the standard NLS equation. We discuss the dynamics of such optical rogue waves via nonlinearity management, i.e., by selecting the appropriate nonlinearity coefficients and integration constants, and presenting the solutions. In addition, we investigate higher-order rogue waves by suitably adjusting the nonlinearity coefficient and the rogue wave parameters, which could help in realizing complex but controllable optical rogue waves in properly engineered fibers and other photonic materials. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

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GB/T 7714 Yang, Zhengping , Zhong, Wei-Ping , Belic, Milivoj et al. Controllable optical rogue waves via nonlinearity management [J]. | OPTICS EXPRESS , 2018 , 26 (6) : 7587-7597 .
MLA Yang, Zhengping et al. "Controllable optical rogue waves via nonlinearity management" . | OPTICS EXPRESS 26 . 6 (2018) : 7587-7597 .
APA Yang, Zhengping , Zhong, Wei-Ping , Belic, Milivoj , Zhang, Yiqi . Controllable optical rogue waves via nonlinearity management . | OPTICS EXPRESS , 2018 , 26 (6) , 7587-7597 .
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Compact flexible multifrequency splitter based on plasmonic graded metallic grating arc waveguide EI SCIE Scopus
期刊论文 | 2018 , 43 (8) , 1898-1901 | OPTICS LETTERS
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A compact flexible multifrequency splitter based on an arc waveguide constructed of plasmonic metallic grating structures with graded-height T-grooves is proposed and studied. The dispersion curves and cutoff frequencies of the plasmonic grating waveguides with different T-groove metallic grating heights are different. The guided spoof surface plasmonic polariton waves at different frequencies can be localized at dissimilar angles along the graded grating arc waveguide. The output flexibility at an arbitrary groove for different frequencies is realized by introducing an additional symmetrical T-groove structure as an output. The compact four-, seven-, and eight-output frequency splitters demonstrate its flexible multifrequency separation capability at different output angle locations, while the dimensional size of the frequency splitters is not increased. Measurement results at the microwave frequency display excellent agreement with numerical simulation results. (C) 2018 Optical Society of America

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GB/T 7714 Han, Chao , Wang, Zhaohong , Chu, Yangyang et al. Compact flexible multifrequency splitter based on plasmonic graded metallic grating arc waveguide [J]. | OPTICS LETTERS , 2018 , 43 (8) : 1898-1901 .
MLA Han, Chao et al. "Compact flexible multifrequency splitter based on plasmonic graded metallic grating arc waveguide" . | OPTICS LETTERS 43 . 8 (2018) : 1898-1901 .
APA Han, Chao , Wang, Zhaohong , Chu, Yangyang , Zhao, Xiaodan , Zhang, Xuanru . Compact flexible multifrequency splitter based on plasmonic graded metallic grating arc waveguide . | OPTICS LETTERS , 2018 , 43 (8) , 1898-1901 .
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Absolute Attitude Estimation of Rigid Body on Moving Platform Using Only Two Gyroscopes and Relative Measurements EI SCIE Scopus
期刊论文 | 2018 , 23 (3) , 1350-1361 | IEEE-ASME TRANSACTIONS ON MECHATRONICS
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Many outdoor activities, such as bicycling, driving, and riding segways can be modeled as rigid bodies on a moving platform. In this study, an attitude estimation scheme is established for the rigid body-moving platform system by using two gyroscopes and relative measurements between the rigid body and the platform. The proposed scheme estimates the drift-free attitudes of the rigid body and the partial drift-free absolute attitudes of the platform without using any global information or reference. The kinematic model plays an important role to obtain the drift-free estimation of the absolute attitude angles. To illustrate this, the estimation scheme is compared to another design with an alternative kinematic model. The estimation result differences between the two designs are analyzed through observability and posterior Cramer-Rao bound calculations. Extensive experiments are also conducted to demonstrate the performance of the proposed attitude estimation scheme with application to bicycle riding examples.

Keyword :

Attitude estimation units (IMU) Kalman filter inertial measurement bicycling

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GB/T 7714 Zhang, Yizhai , Song, Kehao , Yi, Jingang et al. Absolute Attitude Estimation of Rigid Body on Moving Platform Using Only Two Gyroscopes and Relative Measurements [J]. | IEEE-ASME TRANSACTIONS ON MECHATRONICS , 2018 , 23 (3) : 1350-1361 .
MLA Zhang, Yizhai et al. "Absolute Attitude Estimation of Rigid Body on Moving Platform Using Only Two Gyroscopes and Relative Measurements" . | IEEE-ASME TRANSACTIONS ON MECHATRONICS 23 . 3 (2018) : 1350-1361 .
APA Zhang, Yizhai , Song, Kehao , Yi, Jingang , Huang, Panfeng , Duan, Zhansheng , Zhao, Qijie . Absolute Attitude Estimation of Rigid Body on Moving Platform Using Only Two Gyroscopes and Relative Measurements . | IEEE-ASME TRANSACTIONS ON MECHATRONICS , 2018 , 23 (3) , 1350-1361 .
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Modeling and fault analysis of solar photovoltaic grid-connected systems under solar radiation fluctuation consideration EI SCIE Scopus
期刊论文 | 2018 , 28 (8) | INTERNATIONAL TRANSACTIONS ON ELECTRICAL ENERGY SYSTEMS
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This paper presents photovoltaic (PV) systems modeling and fault analysis with solar energy fluctuation to discuss maximum fault current profiles. The modeled PV farm is arranged with series and parallel PV modules to offer 6.5kV power. Two-level 3-phase voltage source inverter (VSI) and dc-dc boost converter are used for all PV systems with LCL filter. A current control strategy using synchronous rotating frame method is implemented with park transformation approach. Average and aggregate models give inaccuracy, which this paper overcomes with accurate isolated single PV system, and PV-dominated feeder. Pulse width modulation and sinusoidal pulse width modulation techniques are applied. Incremental conductance maximum power point tracking technique is used to extract PV maximum power. Phase locked loop technique for grid synchronization and proportional integral voltage control technique are also applied. Here, the maximum fault current corresponds to the maximum phase current at specified time. This simple and effective method is applied on PSCAD software simulations to collect the data. Discussions on obtained results showed short-time irradiation fluctuation impacts on fault current profiles and argue on related aspects. The data comments and explanations to address analyzed protection challenges with PV penetration in distribution system are very promising.

Keyword :

voltage source inverter maximum fault current fault analysis photovoltaic systems current control strategy solar radiation fluctuation

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GB/T 7714 Tekpeti, Browh Serge , Kang, Xiaoning , Kheshti, Mostafa et al. Modeling and fault analysis of solar photovoltaic grid-connected systems under solar radiation fluctuation consideration [J]. | INTERNATIONAL TRANSACTIONS ON ELECTRICAL ENERGY SYSTEMS , 2018 , 28 (8) .
MLA Tekpeti, Browh Serge et al. "Modeling and fault analysis of solar photovoltaic grid-connected systems under solar radiation fluctuation consideration" . | INTERNATIONAL TRANSACTIONS ON ELECTRICAL ENERGY SYSTEMS 28 . 8 (2018) .
APA Tekpeti, Browh Serge , Kang, Xiaoning , Kheshti, Mostafa , Jiao, Zaibin . Modeling and fault analysis of solar photovoltaic grid-connected systems under solar radiation fluctuation consideration . | INTERNATIONAL TRANSACTIONS ON ELECTRICAL ENERGY SYSTEMS , 2018 , 28 (8) .
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