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SYNTHETIC MINORITY OVERSAMPLING TECHNIQUE AND FRACTAL DIMENSION FOR IDENTIFYING MULTIPLE SCLEROSIS

FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY 2017年第4期25卷 1740010-1740010页

作者： Zhang, Yu-Dong Zhang, Yin Phillips, Preetha Dong, Zhengchao Wang, Shuihua Nanjing Normal Univ Sch Comp Sci & Technol Nanjing 210023 Jiangsu Peoples R China Hunan Policy Acad Hunan Prov Key Lab Network Invest Technol Changsha 410138 Hunan Peoples R China Zhongnan Univ Econ & Law Sch Informat & Safety Engn Wuhan 430073 Hubei Peoples R China West Virginia Sch Osteopath Med 400 N Lee St Lewisburg WV 24901 USA Columbia Univ Translat Imaging Div New York NY 10032 USA Columbia Univ MRI Unit New York NY 10032 USA New York State Psychiat Inst & Hosp New York NY 10032 USA CUNY City Coll New York Dept Elect Engn New York NY 10031 USA Kyushu Inst Technol Dept Mech & Control Engn Kitakyushu Fukuoka 8048550 Japan

Multiple sclerosis (MS) is a severe brain disease. Early detection can provide timely treatment. Fractal dimension can provide statistical index of pattern changes with scale at a given brain image. In this study, our team used susceptibility weighted imaging technique to obtain 676 MS slices and 880 healthy slices. We used synthetic minority oversampling technique to process the unbalanced dataset. Then, we used Canny edge detector to extract distinguishing edges. The Minkowski-Bouligand dimension was a fractal dimension estimation method and used to extract features from edges. Single hidden layer neural network was used as the classifier. Finally, we proposed a three-segment representation biogeography-based optimization to train the classifier. Our method achieved a sensitivity of 97.78 +/- 1.29%, a specificity of 97.82 +/- 1.60% and an accuracy of 97.80 +/- 1.40%. The proposed method is superior to seven state-of-the-art methods in terms of sensitivity and accuracy.

关键词： Synthetic Minority Oversampling Technique Canny Edge Detector Fractal Dimension Minkowski-Bouligand Dimension Box Counting Three-Segment Representation Biogeography-Based Optimization

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Nanogold/Bi₂S₃ Nanorods Catalyzed Silver Deposition for Carbon Nanohorns-Enhanced Electrochemical Immunosensing of Escherichia coli O157:H7

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JOURNAL OF THE ELECTROCHEMICAL SOCIETY 2017年第9期164卷 H572-H578页

作者： Zhang, Jing Song, Xinhe Xiong, Zhanbing Dong, Haifeng Wang, Wenchang Chen, Zhidong Changzhou Univ Sch Petrochem Engn Changzhou 213164 Peoples R China Changzhou Univ Jiangsu Key Lab Mat Surface Sci & Technol Changzhou 213164 Jiangsu Peoples R China Univ Sci & Technol Beijing Res Ctr Bioengn & Sensing Technol Beijing 100083 Peoples R China

This work designed an ultrasensitive electrochemical immunosensor for Escherichia coli O157:H7 (E. coli O157:H7) detection using carbon nanohorns as immobilization scaffold and nanogold/ Bi2S3 nanorods (Au/Bi(2)S(3)NRs) as a signal tag to catalyze silver deposition for signal amplification. Au/Bi(2)S(3)NRs prepared by in situ growth of nanogold on Bi2S3 nanorods was used as a tracing tag to label signal antibody, which induced silver deposition for anodicstripping analysis. The immunosensor was constructed by immobilizing capture antibody on carbon nanohorns modified electrode with the aid of polyethylene glycol film. Through a sandwich-type immunoreaction, Au/ Bi(2)S(3)NRs tags were captured on the immunoconjugates to induce a silver deposition process. The electrochemical stripping signal of the deposited silver was used to monitor the immunoreaction. The Au/ Bi(2)S(3)NRs-mediated silver enhancement along with the carbon nanohorns-promoted electron transfer led to high detection sensitivity of E. coli O157:H7 antigen. Under the optimal conditions, the immunosensor exhibited a wide linear dependence on the logarithm of the concentration of E. coli ranging from 40 to 2.0 x 10(6) cfu mL(-1) with a detection limit of 6 cfu mL(-1). Moreover, the proposed sensor was successfully applied in the detection of E. coli O157: H7 in real samples indicating its possibility in practical application. (C) 2017 The Electrochemical Society. All rights reserved.

关键词： Bi2S3 nanorods Carbon nanohorns Electrochemical sensors Escherichia coli O157:H7 immunoassay Signal amplification Silver deposition

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Numerical study on transient harbor oscillations induced by solitary waves

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OCEAN engineering 2016年 126卷 467-480页

作者： Gao, Junliang Ji, Chunyan Liu, Yingyi Gaidai, Oleg Ma, Xiaojian Liu, Zhen Jiangsu Univ Sci & Technol Sch Naval Architecture & Ocean Engn Zhenjiang 212003 Peoples R China Hohai Univ Jiangsu Key Lab Coast Ocean Resources Dev & Envir Nanjing 210098 Jiangsu Peoples R China Dalian Univ Technol State Key Lab Coastal & Offshore Engn Dalian 116024 Peoples R China Kyushu Univ Appl Mech Res Inst Kasuga Fukuoka 8168580 Japan

The main purpose of this article is to systematically investigate the influence of the variation of the incident wave height and the bottom profile inside an elongated rectangular harbor on relevant physical phenomena involved in transient harbor oscillations induced by normal-incident solitary waves. These phenomena include wave height evolution, oscillation amplification, total wave energy and relative wave energy distribution inside the harbor. A series of numerical experiments are carried out using the FUNWAVE 2.0 model. Results show that the height evolution of the incident wave during the shoaling process inside the harbor coincides well with Green's law. When the wave nonlinearity is relatively weak, the maximum oscillation inside the harbor can be regarded as increasing linearly with the incident solitary wave height;while as the wave nonlinearity becomes strong, the amplification factor of the incident solitary wave increases gradually with the wave nonlinearity. The total wave energy trapped in the harbor depends on both the mean water depth and the bottom profile. The relative wave energy distribution inside the harbor is greatly affected by the incident solitary wave height;however, the variation of the bottom profile inside the harbor has a negligible effect on it.

关键词： Harbor resonance Oscillations Solitary wave Wave nonlinearity Numerical simulation FUNWAVE 2.0 model

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Long-Term Structural Responses of Orifices in Gravity Dams Considering Thermal and Creep Effects

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JOURNAL OF PERFORMANCE OF CONSTRUCTED FACILITIES 2016年第3期30卷 1-14页

作者： Zhang, Sherong Yu, Mao Xiao, Feng Wang, Chao Wang, Gaohui Tianjin Univ State Key Lab Hydraul Engn Simulat & Safety Tianjin 300072 Peoples R China Midsouth Design & Res Inst State Engn Changsha 410004 Hunan Peoples R China Wuhan Univ State Key Lab Water Resources & Hydropower Engn S Wuhan 430072 Peoples R China

A numerical simulation method is presented to analyze the thermal and creep effects on structural performance of orifices in gravity dams during construction and operation period. Time-dependent conditions such as the changes of gravity load and water pressure, the concrete viscoelastic material properties, and the variations of environment temperature are all considered for numerical modeling. Compared temperature results obtained from heat transfer analysis with the monitored data around orifice, proposed model is verified to be a reliable tool for thermal-structural coupling analysis. This paper discusses temperature distributions of orifice concrete surfaces in contact with water or air. Tensile stress evolutions arising from temperature variations are investigated correspondingly. Subsequently, cracking risks of orifice with different environments and locations are calculated to evaluate orifice structural performance. Thermal and creep effects on the distributions of tensile stress and cracking risk are studied simultaneously. Results show that long-term thermal and creep effects play important roles in the structural performance of orifice, and orifice concrete surface in contact with air located at the middle part of the dam has a higher cracking risk than surfaces in contact with air or water close to the upstream or downstream of dam. (C) 2015 American Society of Civil Engineers.

关键词： Gravity dam Orifice Structural performance Thermal effects Creep effects Cracking risk

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Polarization-Independent, Thin, Broadband Metamaterial Absorber Using Double-Circle Rings Loaded with Lumped Resistances

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JOURNAL OF ELECTRONIC MATERIALS 2015年第11期44卷 4269-4274页

作者： Chen, Junfeng Huang, Xiutao Zerihun, Gebru Hu, Zhaoyang Wang, Shengming Wang, Guodong Hu, Xiwei Liu, Minghai Huazhong Univ Sci & Technol State Key Lab Adv Electromagnet Engn & Technol Wuhan 430074 Peoples R China Huazhong Univ Sci & Technol Sch Phys Wuhan 430074 Peoples R China Kuang Chi Inst Adv Technol Shenzhen 518057 Peoples R China

We present a broadband and polarization-insensitive metamaterial absorber (MA) composed of a dielectric substrate sandwiched with double-circle rings (DCRs) and welded with lumped resistances and continuous metal film. The structure is designed with thickness of 3 mm and investigated by simulation, fabrication, and experiment. The results show that the composite MA loaded with lumped resistances has wider absorptivity compared with a structure with only DCRs. The simulation results indicate that the proposed absorber achieves 7.60-GHz-wide absorption from 8.87 GHz to 16.47 GHz with absorptivity greater than 90%, in excellent agreement with experimental results. Further simulations indicate that there exist optimal values for the lumped resistances for which the absorptivity is the highest and the bandwidth widest. Additionally, the proposed MA is polarization insensitive at normal incidence. Simulation results for wide angles of incidence of both transverse electric and transverse magnetic waves are also investigated.

关键词： Metamaterial absorber broadband polarization insensitive thin lumped resistances

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Universally-composable finite-key analysis for efficient four-intensity decoy-state quantum key distribution

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EUROPEAN PHYSICAL JOURNAL D 2016年第4期70卷 1-6页

作者： Jiang, Haodong Gao, Ming Yan, Bao Wang, Weilong Ma, Zhi State Key Lab Math Engn & Adv Comp Zhengzhou Henan Peoples R China

We propose an efficient four-intensity decoy-state BB84 protocol and derive concise security bounds for this protocol with the universally composable finite-key analysis method. Comparing with the efficient three-intensity protocol, we find that our efficient four-intensity protocol can increase the secret key rate by at least 30%. Particularly, this increasing rate of secret key rate will be raised as the transmission distance increases. At a large transmission distance, our efficient four-intensity protocol can improve the performance of quantum key distribution profoundly.

关键词： Quantum Information

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Growth and characterization of silicon oxide films formed in the presence of Si, SiC, and Si₃N₄

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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING 2016年第0期54卷 20-28页

作者： Li, Yaqiong Damoah, Lucas Nana Wiredu Zhang, Lifeng Univ Sci & Technol Beijing Sch Met & Ecol Engn Beijing 100083 Peoples R China Univ Ghana Dept Mat Sci & Engn Legon Accra Ghana

In order to comparatively study the growth and characterization of silicon oxide films on Si-based substrates, top-cut solar grade silicon (SOG-Si) containing Si3N4 rods and SiC lumps were used as raw materials and respectively heated at 1773 K and 1873 K under Ar gas. The samples were investigated by Focus Ion Beam/Scanning Electron Microscope (FIB/SEM) and Energy Dispersive Spectroscopy (EDS). Results indicated that silicon oxides with different morphologies successfully grew on the substrates via various mechanisms. Passive oxidation was evident in the formation of a dense SiO2 surface layer on the base material at 1773 K, while active oxidation was evident in the formation of SiO2 with particle, rod, and nanowire-like morphologies, which was the re-oxidation product of SiO at 1873 K under the active to-passive transition. Si, SiC, and Si3N4 have the similar oxidation tendency to form silicon oxides under either passive or active regimes. (C) 2016 Elsevier Ltd. All rights reserved.

关键词： Oxidation-growth Characterization Silicon Oxide Films Si SiC Si3N4

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High-Impedance Surface-Based Broadband Absorbers With Interference Theory

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IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 2015年第10期63卷 4367-4374页

作者： Chen, Junfeng Hu, Zhaoyang Wang, Guodong Huang, Xiutao Wang, Shengming Hu, Xiwei Liu, Minghai Huazhong Univ Sci & Technol Sch Elect & Elect Engn State Key Lab Adv Electromagnet Engn & Technol Wuhan 430074 Peoples R China Kuang Chi Inst Adv Technol Shenzhen 518057 Peoples R China Huazhong Univ Sci & Technol Sch Phys Wuhan 430074 Peoples R China

A broadband and polarization-insensitive high-impedance surface (HIS) metamaterial absorber (MA) based on octagonal ring-shaped resistive patches is presented. The absorber is investigated theoretically, experimentally, and by simulation. The simulated results indicate that this structure obtains 10.28 GHz wide absorption from 3.65 to 13.93 GHz with absorptivity larger than 90% at the normal incidence. Experimental results are in accordance with those of the simulation results. The electromagnetic (EM) field distributions and the plots of surface power loss density have been illustrated to analyze the absorption mechanism of the structure. Further simulations of the absorptivity of the proposed absorber with different surface resistances and substrate thicknesses indicate that there exist optimal values for the design. The polarization-insensitive feature and the properties under oblique incidence are also investigated. Finally, the interference theory is introduced to analyze and interpret the broadband absorption mechanism at both normal and oblique incidences. The calculated absorption rates of the proposed absorber coincide well with the simulated results. Therefore, the simulated and experimental results verify the validity of the theoretically analytical method for this type of broadband absorber.

关键词： Broadband high-impedance surface (HIS) interference theory metamaterial absorber (MA) microwave

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Whispering Gallery Modes Formed by Scattering of an electromagnetic Plane Wave by Two Cylinders

Whispering Gallery Modes Formed by Scattering of an Electrom...

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SCET 2017

作者： Arnold Abramov Yutao Yue Chunlin Ji Ruopeng Liu Xue Li Juehui Zhou Alexander Kostikov Kuang-Chi Institute of Advanced Technology Shenzhen Kuang-Chi Innovative Technology Co.Ltd. Donbass State Engineering Academy

We report the effect of scattering of electromagnetic plane waves by two cylinders on whispering gallery mode(WGM) formation in a cylinder. WGM can occur because of the presence of additional cylinder scatterers at specific location, while WGMs can only form in a single cylinder for specific cylinder radius and/or wavelength values, the matching accuracy required would be much greater than that required in our model for the additional cylinders locations. Analysis of the general solution to the problem showed that the effect can be explained by the interference of waves scattered by additional cylinders and incident on the main cylinder.

关键词： Scattering Wave Cylinder WGM

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Sto2Auc: A Stochastic Optimal Bidding Strategy for Microgrids

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IEEE INTERNET OF THINGS JOURNAL 2017年第6期4卷 2260-2274页

作者： An, Dou Yang, Qingyu Yu, Wei Yang, Xinyu Fu, Xinwen Zhao, Wei Xi An Jiao Tong Univ Sch Elect & Informat Engn Xian 710049 Shaanxi Peoples R China Xi An Jiao Tong Univ MOE Key Lab Intelligent Networks & Network Secur Xian 710049 Shaanxi Peoples R China Xi An Jiao Tong Univ SKLMSE Lab Sch Elect & Informat Engn Xian 710049 Shaanxi Peoples R China Towson Univ Dept Comp & Informat Sci Towson MD 21252 USA Univ Cent Florida Dept Comp Sci Orlando FL 32816 USA Univ Macau Dept Comp & Informat Sci Macau 999078 Peoples R China

Microgrids (MGs) have attracted growing attention due to self-sufficiency and self-healing properties. Nonetheless, the intermittent nature and uncertainty of distributed energy resources and load demands remain challenging issues in balancing demands and managing energy resources in MGs. Existing research efforts mainly focus on developing techniques to enable interactions between local MGs and the utility grid, which leads to high line power losses and operation costs. In this paper, we present the Sto2Auc framework to address the issue of stochastic optimal bidding problem for a system with MGs. First, the optimal bidding problem is formulated as a two-stage stochastic programming process, which aims to minimize the system operation cost and obtain optimal energy capacity of MGs by the MG center controller (MGCC). Uncertainties arise from both energy supply and demand, which are considered in the stochastic model, and random parameters representing those uncertainties are captured by using the Monte Carlo method. Second, to enable optimal electricity trading between the insufficient and surplus MGs, we propose a distributed double auction (DDA)-based scheme, which is proven to converge to the optimal social welfare of the system with MGs, and achieves the economical properties of being strategy-proof, individually rational, and (weak) budget balanced. Extensive experiments on an MG system composed of IEEE-33 buses demonstrate the effectiveness of proposed scheme. The experimental results show that Sto2Auc framework is capable of reducing the operational cost of MG systems, while the implemented DDA scheme achieves good performance with respect to social welfare, demand insufficiency, and MGCC profit.

关键词： Double auction Internet of Things (IoT) applications microgrids (MGs) optimal biding stochastic programming uncertainties

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