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6 results on '"Mao, Kun"'

1. U-Net Conjugate Gradient Solution of Electromagnetic Scattering From Dielectric Objects

Author

Rui Guo, Xiao-Min Pan, Bo-Wen Xue, Bo-Yue Song, Xin-Qing Sheng, Mao-Kun Li, and Di Wu

Subjects
Physics, business.industry, Scattering, Deep learning, Conjugate gradient method, Computational electromagnetics, Dielectric, Artificial intelligence, Method of moments (statistics), business, Computational physics
Abstract

A deep learning-based method is developed to solve electromagnetic scattering problems, where the U-Net is combined with the conjugate gradient method (U-Net-CG). Numerical results show that the U-Net-CG outperforms the traditional CG in terms of computational speed under the comparable accuracy.

Published
2021

2. Multiscale simulation of complex structures using equivalence principle algorithm with high-order field point sampling scheme

Author

Li, Mao-Kun and Chew, Weng Cho

Subjects
Algorithms -- Usage, Decomposition (Mathematics) -- Methods, Integral equations -- Evaluation, Finite element method -- Usage, Algorithm, Business, Computers, Electronics, Electronics and electrical industries
Abstract

In this paper, an updated equivalence principle algorithm (EPA) is presented. Compared with previous work by the authors, the high-order point sampling scheme is used to reduce the high-frequency noise in field projection. An updated tap basis scheme is introduced to simplify the formulation. With these schemes, the equivalence principle algorithm can be used to solve multiscale problems by substituting the oversampled region with a proper equivalence surface. Moreover, EPA can also be accelerated using attached unknown accelerations and multilevel fast multipole algorithm so that large multiscale problems can be solved efficiently. Index Terms--Domain decomposition methods, equivalence principle, high-order point sampling scheme, integral equation solvers, integral equations, method of moments (MoM), multilevel fast multipole algorithm, Nystrom methods, tap basis.

Published
2008

3. Wave-field interaction with complex structures using equivalence principle algorithm

Author

Li, Mao-Kun and Chew, Weng Cho

Subjects
Antennas (Electronics) -- Research, Domain structure -- Research, Electromagnetic fields -- Research, General relativity (Physics) -- Research, Integral equations -- Research, Business, Computers, Electronics, Electronics and electrical industries
Abstract

A domain decomposition scheme based on the equivalence principle, similar to Huygens' principle, for integral equation solvers and the method of moments is introduced. The equivalence principle allows the replacement of unknown currents distributed in a volume in space by equivalence currents residing on the surface that bounds the volume. It also allows the dissociation of the solution of one region from that of another region. In this manner, problems of high complexity can be encapsulated by surfaces of simpler shapes using less unknowns. It can aid in parallel algorithms, reusability of solutions, as well as improving the condition number of a matrix system when disparate mesh or adaptive mesh are needed. The challenge arises when an equivalence surface intercepts a current-carrying conductor, because the breakup of the current into separate pieces gives rise to charge singularity. A junction basis can be used to mitigate this singularity. However, a better solution is to introduce a tap basis to model the current that intercepts with the equivalence surfaces. Using this scheme, the current continuity is conserved and the singularity of the charges is avoided. The solution is shown to be accurate. Index Terms--Domain decomposition, equivalence principle, integral equation, integral equation solvers, junction basis, method of moments (MoM), tap basis.

Published
2007

4. A modified process anomaly detection using Boolean function

Author

Xuehui Du, Yi Sun, and Mao Kun

Subjects
Generalization, business.industry, Computer science, Detector, Pattern recognition, Anomaly detection, False positive rate, Artificial intelligence, Anomaly (physics), Boolean function, business, Hidden Markov model
Abstract

This paper proposes a process anomaly detection method using Boolean function to discover whether a running process is compromised. This method combines the results of multiple detectors to avoid the single detector's limitation of inadequate training and therefore poor generalization performance. It aims at higher true positive rate and lower false positive rate in the detection. Traditional hidden Markov model is used and improved to describe the process, so that we can tell what normality is and what anomaly is. A simplified Boolean function is utilized to improve the efficiency. Two algorithms are proposed to evaluate and improve the detector's performance. And it turns out to be satisfying with high true positive rate and low false positive rate in the simulation.

Published
2012

5. The research and simulation of multipath_OLSR for mobile ad hoc network

Author

Ren Zhi, Yu Jingdong, and Mao Kun

Subjects
Delay-tolerant networking, Vehicular ad hoc network, Optimized Link State Routing Protocol, business.industry, Wireless ad hoc network, Ad hoc On-Demand Distance Vector Routing, Computer science, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, Wireless Routing Protocol, Mobile ad hoc network, Ad hoc wireless distribution service, business, Computer network
Abstract

This paper introduces an algorithm of multipath on OLSR with an algorithm of load/spl I.bar/assigned for mobile ad hoc networks. Then, this algorithm is compared with standard OLSR protocol. It can be concluded that this solution could decrease congestion of network, improve the success rate and throughput effectively, balance load, and every node deal with less frames than standard OLSR, so the node can have longer life-span in the network.

Published
2006

6. A 800 V dual conduction paths segmented anode LIGBT with low specific on-resistance and small shift voltage

Author

Qiao Ming, Li Zhaoji, Zhang Bo, and Mao Kun

Subjects
LDMOS, Materials science, business.industry, Bipolar junction transistor, Electrical engineering, Condensed Matter Physics, Thermal conduction, On resistance, Electronic, Optical and Magnetic Materials, Anode, Surface field, Materials Chemistry, Breakdown voltage, Optoelectronics, Electrical and Electronic Engineering, business, Voltage
Abstract

A dual conduction paths segmented anode lateral insulated-gate bipolar transistor (DSA-LIGBT) which uses triple reduced surface field (RESURF) technology is proposed. Due to the hybrid structures of triple RESURF LDMOS (T-LDMOS) and traditional LIGBT, firstly, a wide p-type anode is beneficial to the small shift voltage (VST) and low specific on-resistance (Ron,sp) when the anode voltage (VA) is larger than VST. Secondly, a wide n-type anode and triple RESURF technology are used to get a low Ron,sp when VA is less than VST. Meanwhile, it can accelerate the extraction of electrons, which brings a low turn-off time (Toff). Experimental results show that: VST is only 0.9 V, Ron,sp (Ron × Area) are 11.7 and 3.6 Ω·mm when anode voltage VA equals 0.9 and 3 V, respectively, the breakdown voltage reaches to 800 V and Toff is only 450 ns.

Published
2014

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