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Search Results: 1 - 10 of 4218 matches for " Dewei Kong "
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Evaluation of Hepatic Cystic Echinococcosis’ CT image in Xinjiang Uygur Autonomous Region based on Kolmogorov Complexity Model  [PDF]
Jingjing Zhou, Murat Hamit, Abdugheni Kutluk, Chuanbo Yan, Li Li, Jianjun Chen, Yanting Hu, Dewei Kong, Weikang Yuan
Engineering (ENG) , 2012, DOI: 10.4236/eng.2012.410B015

Designing and developing computer-assisted image processing techniques to help doctors improve their diagnosis has received considerable interests over the past years. In this paper, we used the kolmogorov complexity model to analyze the CT images of the healthy liver and multiple daughter hydatid cysts. Before the complexity characteristic calculating, the image preprocessing methods had been used for image standardization. From the kolmogorov complexity model, complexity characteristic were calculated in order to quantify the complexity, between healthy liver and multiple daughter hydatid cysts. Then we use statistical method to analyze the complexity characteristic of those two types of images. Our preliminary results show that the complexity characteristic has statistically significant (p<0.05) to analyze these two types CT images, between the healthy liver and the multiple daughter hydatid cysts. Furthermore, the result leads us to the conclusion that the kolmogorov complexity model could use for analyze the hydatid disease and will also extend the analysis the other lesions of liver.

Growth and Electrical Properties of Doped ZnO by Electrochemical Deposition  [PDF]
Dewei Chu, Sean Li
New Journal of Glass and Ceramics (NJGC) , 2012, DOI: 10.4236/njgc.2012.21003
Abstract: In this work, pure and different metal ions doped ZnO thin films were obtained by a facile electrochemical deposition process. Different morphologies of ZnO, such as nanoplates, nanoparticles, as well as dense film can be obtained by doping Cu2+, In3+, and Al3+, respectively. Besides, the electrical properties of ZnO were also dependent on the doping ions. In this work, only pure ZnO shows resistive switching characteristics, indicating that the defects in ZnO is a key role in inducing resistive switching behaviour.
Doped Amorphous Carbon Films Prepared by Liquid Phase Electrodeposition  [PDF]
Canyan Che, Yang Li, Guifeng Zhang, Dewei Deng
Open Journal of Synthesis Theory and Applications (OJSTA) , 2014, DOI: 10.4236/ojsta.2014.31002

It has theoretical significance and practical value to synthetize and modify amorphous carbon films by liquid electro-deposition technique due to its low cost, simple equipment, and better operability in uniform deposition of the films with large-area and complex shape work pieces. This article introduces the research situation of the carbon films prepared by liquid phase electrochemical deposition according to the applied voltage, discusses the influence of experimental parameters on the film properties, and describes possible reaction mechanisms. It summarizes the research progress of amorphous carbon films doped with metal and nonmetals. Finally, existing problems have been demonstrated and suggestions on research hotspots in the future are given.

Enhancement of Resistance Switching in Electrodeposited Co-ZnO Films
Dewei Chu,Adnan Younis,Sean Li
ISRN Nanotechnology , 2012, DOI: 10.5402/2012/705803
Abstract: High quality Co-doped ZnO films were prepared with electrodeposition. The correlation among the surface morphology, lattice structure, Co-dopant distribution, and resistance switching properties of the as-deposited films were investigated. It is found that resistance switching behaviour could be manipulated by controlling the composition of Co in the ZnO films. The significant enhancement of resistance switching was achieved with 5 at% Co doping in the films, and the possible switching mechanism was also discussed. 1. Introduction Resistive switching random access memory (RRAM) has attracted enormous interests, due to its simple structure and compatibility with complementary metal oxide semiconductor technology [1–5]. In comparable with the traditional nonvolatile memories (flash), RRAM exhibits unique advantages including much faster writing rate, smaller bit cell size, and lower operating voltages. In particular, the resistive transition induced by applying electric pulses can complete within tenths of nanoseconds at room temperature while the resultant resistance states could be retained for 10 years [2, 6, 7]. RRAM devices are usually structured with an insulating layer sandwiched by two electrodes, which generate reversible electrical field to induce the resistance switching. In this case, the performance of RRAM strongly depends on the resistively switching materials. Therefore, the primary requirement for RRAM is to develop a material that possesses resistive switching effect. To date, a number of materials have been found to have resistive switching behavior, for example, ferromagnetic oxide (Pr1?xCaxMnO3), doped perovskite oxide (SrZrO3), and binary transition metal oxide (TiO2, NiO, ZnO, and Cu2O) [1, 2, 4, 6, 8–11]. Among these materials, only the transition metal oxides are transparent to the visible light due to their large optical band gap. More importantly, their compositions are easier to be controlled compared to the ferromagnetic or perovskite oxides. Hence, such materials have a great potential for the applications of transparent RRAM devices [12, 13]. In this work, high quality Co-doped ZnO films were prepared with electrodeposition at low temperature, and their resistive switching behaviors were characterized. The morphology and size of metal oxide crystals were optimized by manipulating the potential, current, and concentration of the reactant. Co was strategically doped into ZnO to enlarge the memory window via increasing the resistivity of the high resistance state. 2. Experiment Electrodeposition was carried out in an Autolab
Large-Scale Distributed Photovoltaic Power Dispatching and Operation Management Review  [PDF]
Nan Zhang, Yuefeng Wang, Yuehui Huang, Dewei Liu, Yunfeng Gao, Haifeng Li
Journal of Power and Energy Engineering (JPEE) , 2015, DOI: 10.4236/jpee.2015.34044

Distributed photovoltaic power (PV) is the main development model of distributed generation. It is necessary to research on dispatching and operation management with large-scale distributed PV connected. This paper analyzes development status, technical requirement and dispatching and operation management situation of distributed PV in Germany and China. Then introduce the preparation of distributed PV dispatching and operation management criterion. Through summarizing the experiences and lessons of large-scale distributed PV development in Germany, it gives advice to the development of distributed PV dispatching and operation management in China.

Construct the Community of IT Education and Break the Bottleneck of Rural School Educational Informationization  [PDF]
Dehua Kong
Intelligent Information Management (IIM) , 2012, DOI: 10.4236/iim.2012.44025
Abstract: Based on the current situation of rural educational informationization, my study found that the boost of rural elementary and secondary school’s educational informationization needed the cooperation of higher normal universities and local education administrative department. The construction of “IT education community” is the key to step off the predicament. The practice application and effect in Gaoping City further proved that the cooperation project broke the bottleneck of rural elementary and secondary school’s educational informationization.
The Atomic Regular Polyhedron Electronic Shell  [PDF]
Zilong Kong
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.410A1001

The periodic table of elements is arranged based on a series of regular polyhedron. The stability of inert gas atoms can be explained by the distribution of electrons, as well as their motion and magnetic force structure. A magnetic force regular octahedron is proposed. It is a unique configuration that best satisfies the convergence of electrons moving in the same direction within regular polyhedra. In the case of an electrostatic force crust, the formal electron spin accounts for the crusts intrinsic magnetic moment exceeding the speed of light. If one is to consider that the electron has a magnetic outer layer and an electrostatic inner layer, then the question can be solved and abovementioned inference can provide the basis for magnetic force and momentum for the regular octahedron model. The electron periphery has twenty-petal adsorptive substances; the existence of adsorptive substance causes the magnetic force greater than the electrostatic force. Each electronic shell in the regular polyhedron is in accordance with the electron configuration of periodic table of elements; the kinetic track of each electron is a surface of regular polyhedron. The magnetic properties of iron, cobalt, and nickel can be explained by the regular dodecahedron electronic shell of an atom. The electron orbit converged from reverse direction can explain diamond. The adsorptive substances found in atomic nuclei and electrons are defined as magnetic particles called magnetons. The thermodynamic magneton theory can be better explained when it is analyzed using principles of thermodynamics, superconductivity, viscosity, and even in the creation of glass. The structure of the light is a helical line.

Ferromagnetic Calculation of Terbium Dysprosium and Holmium with Polyhedron Electron Shell  [PDF]
Zilong Kong
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.613179
Abstract: Based on the regular polyhedron model of multi-electronic atom combined with the Bohr hypothesis, the following supposition is put forward: the electron momentum multiplied by the inscribed sphere radius of edges of each regular polyhedron is equal to the Planck constant. The relationship between saturation magnetization rates and Planck constants is determined, and the ferromagnetism of atoms is obtained from regular dodecahedron and regular hexahedron. Then, terbium, dysprosium, and holmium saturation magnetization rate are obtained from electronic regular polyhedron configuration. Derivation of matter wave formula is from thermodynamics, avoiding over speed of light.
The Pricing of IPO by Investment Banks and Venture Capital: A Theoretical Model  [PDF]
Huanran Kong
Open Journal of Social Sciences (JSS) , 2018, DOI: 10.4236/jss.2018.610017
Abstract: The venture capitalists provide supervision and certification service for shareholding enterprises, which reduce the information asymmetry and attract more high quality investment banks. Thus, the price is close to the market price when the enterprise enters the market and under-pricing is avoided thereby. Based on the supervision and certification hypothesis, this paper builds a pricing model of investment banks and venture capital to explain the pricing mechanism of investment bank, investment risk pricing mechanism and the causes of underpricing.
Bipolar resistive switching in p-type Co3O4 nanosheets prepared by electrochemical deposition
Adnan Younis, Dewei Chu, Xi Lin, Jiunn Lee and Sean Li
Nanoscale Research Letters , 2013, DOI: 10.1186/1556-276X-8-36
Abstract: Metal oxide nanosheets have potential applications in novel nanoelectronics as nanocrystal building blocks. In this work, the devices with a structure of Au/p-type Co3O4 nanosheets/indium tin oxide/glass having bipolar resistive switching characteristics were successfully fabricated. The experimental results demonstrate that the device have stable high/low resistance ratio that is greater than 25, endurance performance more than 200 cycles, and data retention more than 10,000 s. Such a superior performance of the as-fabricated device could be explained by the bulk film and Co3O4/indium tin oxide glass substrate interface effect.
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