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Train cruising movement simulation module is an important part of high-speed train moving simulation system. According to the actual cruising movement characteristics of high-speed train, it is very important to design high-speed train cruising movement simulation algorithm to improve the calculation accuracy of train moving simulation system. Based on the conditions and the characteristics of high-speed...
The integrated charge batching and casting start time determining (ICBCSD) problem is studied in this paper. ICBCSD is a combinatorial optimization problem extracted from the production and operations management of steel plants. A hierarchical optimization method based on variable neighborhood search (VNS) is proposed to solve ICBCSD. The number of casts on each continuous caster and the number of...
Manufacturing quality prediction performance is influenced by multi-parameter in manufacturing multi-stage processes. To solve this problem, a two-step feature learning approach (TFLR) is proposed in this paper. For the first step learning, the multi-parameter feature (high-dimensional information) is learned by a manifold learning algorithm (ML), which can enhance the representation of the multi-parameter...
Expected product quality is affected by multi-parameter in complex manufacturing processes. Product quality prediction can offer the possibility of designing better system parameters at the early production stage. Many existing approaches fail at providing favorable results duo to shallow architecture in prediction model that can not learn multi-parameter's features insufficiently. To address this...
A coal mine rescue snake robot with four orthogonal joints is developed. Taking the robot as an experimental platform, aiming at how to model and identify the environment of the coal mine tunnel after the disaster, a multi sensor data fusion algorithm based on genetic algorithm optimization of the variable structure fuzzy neural network (GAFNN) is proposed. Firstly, the fuzzy neural network model...
Effect of nitrogen annealing on SiC/SiO2 interface properties was comparatively investigated for SiC MOS capacitors. Interface properties were characterized by normalized parallel conductance and interface state density value, and dielectric strength was evaluated by the electric-field-to-breakdown (Ebd). The results exhibited that both fast and slow states were present at the nitrogen-annealed samples'...
The 4H-SiC ultraviolet detector of the MESFET structure with gain is proposed and simulated in this paper. The Schottky gate of MESFET is transparent or semi-transparent to allow more of the incident UV light to be absorbed in the device. The effect of the doping and thickness of the channel layer on the photocurrent of the 4H-SiC MESFET UV detector is simulated and the effect mechanism is analyzed...
The parameter establishment of differential evolution algorithm (DE) is generally determined by the experience selection method, whose shortcomings include the massive operational parameters, the difficulty in obtaining the best parameter combination, and further obstacle to improve the optimization ability of the algorithm to a great extent. The article introduces the uniform design method of differential...
The fabrication of 1200V SiC MOSFET with developed nitrided gate oxide and self-aligned channel technology are reported. Post-oxidation annealing in nitrogen-contained ambient can effectively passivate defects at the SiC/SiO2 interface which is beneficial for the mobility improvement in SiC MOSFETs. The process of nitridation begins from the conduction band and extends to the mid-band-gap gradually...
Modern understanding of microbiology largely lays foundation in the biological characterization of microorganisms. However, the landscape relationships of host transcriptional response (HTR) to different bacterial pathogens have not yet been systematically explored. Here, we established the first generation of HTR network (HTRN) according to the HTR similarities among 21 different human pathogenic...
Based on the impact ionization theory, along with a series of improved models for 4H-SiC material, the breakdown characteristics simulations of 4H-SiC MOSFETs with Field Limiting Rings (FLRs) are performed in this paper with Atlas of Silvaco TCAD. 1200V 4H-SiC MOSFETs with different spaces FLRs are presented and a maximum breakdown voltage of 1940V is achieved with an optimized 15 FLRs. The optimization...
In order to simplify the fabrication process of silicon carbide power MOSFETs (metal oxide semiconductor field effect transistors), the issue of the simultaneous formation process of ohmic contacts to both the p-well and n-source regions of the SiC devices using same contact materials and one step annealing needs to be addressed. In this study, Ni/Ti/Al ohmic contacts to p- and n-type 4H-SiC with...
An improved 4H-SiC metal-oxide-semiconductor field-effect transistors (MOSFETs) with nonuniform doped P well is introduced and the electrical performances are analyzed in this paper. A comparable breakdown voltage of 2248V, a higher saturation drain current Idsat=0.2mA, a lower threshold voltage Vth=2.17V and a much higher maximum transconductance gm=0.02mS than the traditional ones are achieved with...
Traditional communication system in the L-band (960–1164 MHz) operates in the frequency gaps between the Distance Measuring Equipment (DME) channels. However, this will lead to a waste of the frequency resources. In this paper, a spectrum spread communication system which is overlapped with the DME is considered. Moreover, it utilizes the extended Complementary Code Keying (CCK) sequence to get a...
With the increasing energy consumption in Chinese mainline railways amid the worldwide carbon emission concerns, the need for energy-efficient locomotive operation becomes urgent. Locomotive operation is directly linked to speed limits imposed by the train ahead through signaling. In China's mainline railways, speed limits for locomotive operation change frequently because of relatively short headways...
This paper aims to develop an approach that enables cloud computing clients to verify health regulatory compliance claimed by cloud computing providers. In this approach, clients of cloud computing could check automatically how the cloud provider meets the regulatory compliance such as HIPAA legislation for their health records. Although cloud providers often furnish their services with third party...
The manhole covers are one of the important urban infrastructures, but unfortunately they are stolen frequently. If the uncovered manholes can not be found timely and processed immediately, it may threaten to the city's normal operation. Because the ownership of the manhole covers are unclear, it is much harder to manage these ownerless manhole owners (OLMCS). Based on the deep analyses of the current...
Information Systems Security Architecture (ISSA) typically plays a key role as a bridge between security requirements and implementation of security system, but it lacks a management context. A lifecycle management framework of ISSA was proposed in this article, and the framework elements and the constructing steps were thoroughly explored.
This paper focuses on the establishment of an urban flood control system in Xicheng district of Beijing by means of detecting rain monitoring sensors located in some lower yards or long term water accumulation areas. This system takes a good advantage of sensors and 3G network technology, and overcomes the pitfalls of lower accuracy and hard to update for the rain precipitation during the monitoring...
Based on the mathematical model of static energy, an improved mathematical model of branch reactive potential energy was constructed in this paper.Started from branch energy information and combined with complex network theory, a line-weighted factor was proposed to quantify the reactive potential energy.Secondly according to the voltage control problems, a weighted grid topology model based on branch...
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