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Your search keyword '"Cai, Guoqing"' showing total 10 results
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10 results on '"Cai, Guoqing"'

7. A Three-Dimensional Boundary-Dependent Compact Thermal Network Model for IGBT Modules in New Energy Vehicles.

Author

Ma, Mingyao, Guo, Weisheng, Yan, Xuesong, Yang, Shuying, Zhang, Xing, Chen, Wenjie, and Cai, Guoqing

Subjects
INSULATED gate bipolar transistors, FINITE element method, POWER electronics, POWER density
Abstract

With the development of power electronics technology, power modules delivery considerably greater power density, which makes junction temperature an important parameter for reliable operation. Existing thermal models often ignore the influence of the thermal boundary conditions on the thermal parameter and cannot accurately predict junction temperature in various operating conditions. This article proposes a three-dimensional compact thermal network model that considers the thermal boundary conditions and can be obtained by the finite-element method (FEM). A novel two-step method for thermal parameter extraction is presented and the effects of boundary conditions on thermal network parameters are discussed in detail. The experimental results and FEM simulation show that the proposed thermal network model can accurately estimate the junction temperature in different thermal boundary conditions. [ABSTRACT FROM AUTHOR]

Published
2021
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8. Transmission Rate Analysis in Multi-Level Hierarchical Coded Caching

Author

Xinbing Wang, Xiong Wang, Jinbei Zhang, Xiaohua Tian, Jingchao Wang, Xiaoying Gan, and Cai Guoqing

Subjects
Hardware_MEMORYSTRUCTURES, CPU cache, Computer science, Transmission rate, Distributed computing, Server, 0202 electrical engineering, electronic engineering, information engineering, Leverage (statistics), 020206 networking & telecommunications, Content delivery network, 02 engineering and technology
Abstract

Coded caching has demonstrated the superiority in mitigating traffic pressure through jointly considering content delivery and storage schemes. However, existing works mainly focus on the situation where users have uniform demands with multiple layer of caches. In this paper, we propose a multilevel hierarchical coded caching scheme when users have nonuniform demands in a multi-hop content delivery network scenario. Specifically, to maintain the symmetry constraint of coded caching we utilize K-means to separate the file set with arbitrary distribution of popularity into several file subsets. We also formulate the Jensen's inequality and derive the upper bound of the transmission rate in each layer. To evaluate the system efficiency, we leverage the open-source Netflix dataset as our file set and conduct an experiment on a content delivery network with two layers of caches. Experimental results demonstrates that our multilevel hierarchical coded caching scheme performs much better than the baseline LFU caching scheme.

Published
2017

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