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14 results on '"Liu, Jialei"'

6. Availability-Aware Virtual Cluster Allocation in Bandwidth-Constrained Datacenters.

Author

Liu, Jialei, Wang, Shangguang, Zhou, Ao, Buyya, Rajkumar, and Yang, Fangchun

Abstract

As greater numbers of data-intensive applications are required to process big data in bandwidth-constrained datacenters with heterogeneous physical machines (PMs) and virtual machines (VMs), network core traffic is experiencing rapid growth. The VMs of a virtual cluster (VC) must be allocated as compactly as possible to avoid bandwidth-related bottlenecks. Since each PM/switch has a certain failure probability, a VC may not be executed when it meets with any PM/switch fault. Although the VMs of a VC can be spread out across different fault domains to minimize the risk of violating the availability requirement of the VC, this increases the network core traffic. Therefore, avoiding the decrease in availability caused by the heterogeneous PM/switch failure probabilities and bandwidth-related bottlenecks has been a constant challenge. In this paper, we first introduce a joint optimization function to measure the overall risk cost and overall bandwidth usage in the network core to allocate the same set of data-intensive applications. We then introduce an approach to maximize the value of the joint optimization function. Finally, we performed a side-by-side comparison with prior algorithms, and the experimental results show that our approach outperforms the other existing algorithms. [ABSTRACT FROM AUTHOR]

Published
2020
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10. The design of the general power system based on single-slice motor control

Author

Liu Jialei and Zhu Guixian

Subjects
Electric motor, Electric power system, Control theory, business.industry, Computer science, Embedded system, Motor control, Voltage regulation, Voltage optimisation, business, AC motor, Power control
Abstract

The general power system based on single-slice motor control have many advantage such as control safety and operation stabilize, this paper is taking the illumination system under single-slice motor control as example, has discussed single-slice motor control circuit (the modular of low voltage) how to carry out realization of accurate timing control for general power system (the modular of high voltage).

Published
2011

11. The performance quantitative method of data acquisition system based on model identification

Author

Liu Jialei and Hou Guifa

Subjects
Least mean squares filter, Engineering, Data acquisition, Finite impulse response, Transmission (telecommunications), Control theory, business.industry, Control system, System identification, Filter (signal processing), business, System model
Abstract

In some complex control system, the performance of data acquisition system has a direct impact of the performance index of the whole control system, so it has the important significance that research the accurate assessment method of data acquisition system. This paper put forward a performance quantitative method of data acquisition system based on model identification. Its basic idea is as follows: treating transverse impact response of finite length units (FIR) filter as system model to obtain the system characteristics of the sinusoidal signal amplitude and phase shift characteristics as indexes. In the system identification, the channel parameters of system is iterated by the least mean square (LMS) algorithm, equate the output of system in response to sinusoidal signal. and obtain the transmission characteristic of the sinusoidal signal of data acquisition system; Finally, the simulation test of the algorithm is performed by the computer software, experimental results show that LMS reflects accurately the data acquisition characteristic of system, and provides a good analysis way for performance appraisal of acquisition system.

Published
2010

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