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17 results on '"Peng, Yaxin"'

2. CP3: Channel Pruning Plug-in for Point-Based Networks

Author

Huang, Yaomin, primary, Liu, Ning, additional, Che, Zhengping, additional, Xu, Zhiyuan, additional, Shen, Chaomin, additional, Peng, Yaxin, additional, Zhang, Guixu, additional, Liu, Xinmei, additional, Feng, Feifei, additional, and Tang, Jian, additional

Published
2023
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8. One-Kilohertz Fundamental Frequency Operation of a SiC Power Converter for Future Aircraft System

Author

Firman Sasongko, Josep Pou, Peng Yaxin, and Rejeki Simanjorang

Subjects
business.industry, Computer science, Electrical engineering, Fundamental frequency, law.invention, Power (physics), Capacitor, chemistry.chemical_compound, chemistry, law, Dynamic loading, Silicon carbide, Inverter, business, Aerospace, Voltage
Abstract

This paper presents a three-phase two-level high-power-density inverter operating at 1-kHz fundamental frequency and 100-kHz switching frequency under dynamic loads. The inverter was previously designed and optimized to operate at 400-Hz and capable to deliver 50 kW of power. Since the next-generation aerospace applications will likely operate at a higher fundamental frequency, some experimental tests have been done to evaluate the inverter operating under such conditions. This paper uses a simple voltage control to regulate the inverter output voltages under dynamic loading conditions. The experimental results show that the inverter output voltages can be well regulated even under load transients. The results also indicate that the previously designed inverter can still be operated at a higher fundamental frequency.

Published
2018

9. Condition Monitoring of Electrolytic Capacitor based on ESR Estimation and Thermal Impedance model using Improved Power Loss Computation

Author

Mohamed Halick Mohamed Sathik, Tan Chuan Seng, Rejeki Simanjorang, Mohamed Sathik Mohamed Halick, Peng Yaxin, Firman Sasongko, and Sundararajan Prasanth

Subjects
Arrhenius equation, Electrolytic capacitor, Materials science, Equivalent series resistance, 020209 energy, Thermal resistance, 020208 electrical & electronic engineering, Condition monitoring, 02 engineering and technology, Power (physics), law.invention, symbols.namesake, Capacitor, Operating temperature, Control theory, law, 0202 electrical engineering, electronic engineering, information engineering, symbols
Abstract

Aluminium Electrolytic Capacitors (AEC) are indispensable in applications where high capacitance per unit volume and low cost are preferred. However, it is also one of the most failure-prone components in a power converter system. As AEC is an electrochemical device, which follows Arrhenius law, the most important life-deciding factor of an AEC is its operating temperature [1]. In this paper, a condition monitoring system for AECs is proposed based on the accurate estimation of equivalent series resistance (ESR) and operating temperature. Operating temperature is estimated using the thermal impedance model based on improved power loss calculation methodology. The proposed method computes power loss using the capacitor voltage and current in contrast to the existing methods [4] - [7] which uses capacitor current and ESR to estimate the power loss. Thereby, it avoids the issue of ESR variation with ageing and temperature which may give erroneous results with ageing in case of stored look-up tables for ESR. ESR estimation is based on the method proposed in [14]. As ESR is the most widely used degradation indicator, the ESR and operating temperature can be used to estimate the present health status of an AEC.

Published
2018

13. Consensus in Fractional-Order Multi-Agent Systems With Intermittence Sampled Data Over Directed Networks.

Author

Ye, Yanyan, Su, Housheng, Chen, Jinhe, and Peng, Yaxin

Abstract

The leaderless consensus of fractional-order multi-agent systems (FOMASs) by intermittence sampled data control method is investigated in this brief, for which a distributed intermittence sampled data control protocol is presented to reduce the updating rate and working time of controllers. Subsequently, the Laplace transform and the stability theory are utilized to derive some necessary and sufficient consensus criteria that show the relations among the fractional order, sampling period, communication width, coupling strengths, and network topology. What is more, it can be discovered that both the communication width and sampling period have the lower and upper bounds for given networks to attain leaderless consensus. Finally, a numerical simulation example is presented to prove the theoretical results. [ABSTRACT FROM AUTHOR]

Published
2020
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15. Manifold Preserving: An Intrinsic Approach for Semisupervised Distance Metric Learning.

Author

Ying, Shihui, Wen, Zhijie, Shi, Jun, Peng, Yaxin, Peng, Jigen, and Qiao, Hong

Subjects
MANIFOLDS (Mathematics), METRIC system, MACHINE learning
Abstract

In this paper, we address the semisupervised distance metric learning problem and its applications in classification and image retrieval. First, we formulate a semisupervised distance metric learning model by considering the metric information of inner classes and interclasses. In this model, an adaptive parameter is designed to balance the inner metrics and intermetrics by using data structure. Second, we convert the model to a minimization problem whose variable is symmetric positive-definite matrix. Third, in implementation, we deduce an intrinsic steepest descent method, which assures that the metric matrix is strictly symmetric positive-definite at each iteration, with the manifold structure of the symmetric positive-definite matrix manifold. Finally, we test the proposed algorithm on conventional data sets, and compare it with other four representative methods. The numerical results validate that the proposed method significantly improves the classification with the same computational efficiency. [ABSTRACT FROM AUTHOR]

Published
2018
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