Qingwei Chai

Dr. Qingwei Chai

College of Computer Science and Engineering, Shandong University of Science and Technology, Qingdao
orcid

Research Focus & Metrics

Academic Career Length

8Years (2019-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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24 October 2019 in Applied Sciences
Verified
Journal Article
Open access
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Pei HuPei Hu
Pei Hu
Jeng-Shyang PanJeng-Shyang Pan
Jeng-Shyang Pan
Shu-Chuan ChuShu-Chuan Chu
Shu-Chuan Chu
QCQingwei Chai
Qingwei Chai
TLTao Liu
Tao Liu
ZLZhong-Cui Li
Zhong-Cui Li
Two new hybrid algorithms are proposed to improve the performances of the meta-heuristic optimization algorithms, namely the Grey Wolf Optimizer (GWO) and Shuffled Frog Leaping Algorithm (SFLA). Firstly, it advances the hierarchy and position updating of the mathematical model of GWO, and then the SGWO algorithm is proposed based on the advantages of SFLA and GWO. It not only improves the ability of local search, but also speeds up the global convergence. Secondly, the SGWOD algorithm based on SGWO is proposed by using the benefit of differential evolution strategy. Through the experiments of the 29 benchmark functions, which are composed of the functions of unimodal, multimodal, fixed-dimension and composite multimodal, the performances of the new algorithms are better than that of GWO, SFLA and GWO-DE, and they greatly balances the exploration and exploitation. The proposed SGWO and SGWOD algorithms are also applied to the prediction model based on the neural network. Experimental results show the usefulness for forecasting the power daily load.

10 July 2023 in Sensors
Verified
Journal Article
Open access
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WZWeimin Zheng
Weimin Zheng
PSPang SenYuan
Pang SenYuan
NLNing Liu
Ning Liu
QCQingwei Chai
Qingwei Chai
LXLindong Xu
Lindong Xu
Indoor localization has broad application prospects, but accurately obtaining the location of test points (TPs) in narrow indoor spaces is a challenge. The weighted K-nearest neighbor algorithm (WKNN) is a powerful localization algorithm that can improve the localization accuracy of TPs. In recent years, with the rapid development of metaheuristic algorithms, it has shown efficiency in solving complex optimization problems. The main research purpose of this article is to study how to use metaheuristic algorithms to improve indoor positioning accuracy and verify the effectiveness of heuristic algorithms in indoor positioning. This paper presents a new algorithm called compact snake optimization (cSO). The novel algorithm introduces a compact strategy to the snake optimization (SO) algorithm, which ensures optimal performance in situations with limited computing and memory resources. The performance of cSO is evaluated on 28 test functions of CEC2013 and compared with several intelligent computing algorithms. The results demonstrate that cSO outperforms these algorithms. Furthermore, we combine the cSO algorithm with WKNN fingerprint positioning and RSSI positioning. The simulation experiments demonstrate that the cSO algorithm can effectively reduce positioning errors.

23 April 2020 in Sensors
Verified
Journal Article
Open access
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Jeng-Shyang PanJeng-Shyang Pan
Jeng-Shyang Pan
QCQingwei Chai
Qingwei Chai
Shu-Chuan ChuShu-Chuan Chu
Shu-Chuan Chu
NWNing Wu
Ning Wu
In this paper, a new intelligent computing algorithm named Enhanced Black Hole (EBH) is proposed to which the mutation operation and weight factor are applied. In EBH, several elites are taken as role models instead of only one in the original Black Hole (BH) algorithm. The performance of the EBH algorithm is verified by the CEC 2013 test suit, and shows better results than the original BH. In addition, the EBH and other celebrated algorithms can be used to solve node coverage problems of Wireless Sensor Network (WSN) in 3-D terrain with satisfactory performance.

9 May 2023 in Expert Systems with Applications
Verified
Journal Article
Closed access
NLNing Liu
Ning Liu
SLShangkun Liu
Shangkun Liu
QCQingwei Chai
Qingwei Chai
WZWeimin Zheng
Weimin Zheng

1 January 2021 in Wireless Communications and Mobile Computing
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Journal Article
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WZWeimin Zheng
Weimin Zheng
NLNing Liu
Ning Liu
QCQingwei Chai
Qingwei Chai
Shu-Chuan ChuShu-Chuan Chu
Shu-Chuan Chu
The mobile sensor network can sense and collect the data information of the monitored object in real time in the monitoring area. However, the collected information is meaningful only if the location of the node is known. This paper mainly optimizes the Monte Carlo Localization (MCL) in mobile sensor positioning technology. In recent years, the rapid development of heuristic algorithms has provided solutions to many complex problems. This paper combines the compact strategy into the adaptive particle swarm algorithm and proposes a compact adaptive particle swarm algorithm (cAPSO). The compact strategy replaces the specific position of each particle by the distribution probability of the particle swarm, which greatly reduces the memory usage. The performance of cAPSO is tested on 28 test functions of CEC2013, and compared with some existing heuristic algorithms, it proves that cAPSO has a better performance. At the same time, cAPSO is applied to MCL technology to improve the accuracy of node localization, and compared with other heuristic algorithms in the accuracy of MCL, the results show that cAPSO has a better performance.

1 January 2021 in Wireless Communications and Mobile Computing
Verified
Journal Article
Open access
PDF file
QCQingwei Chai
Qingwei Chai
JZJerry Wangtao Zheng
Jerry Wangtao Zheng
Wireless sensor network (WSN) attracts the attention of more and more researchers, and it is applied in more and more environment. The localization information is one of the most important information in WSN. This paper proposed a novel algorithm called the rotated black hole (RBH) algorithm, which introduces a rotated optimal path and greatly improves the global search ability of the original black hole (BH) algorithm. Then, the novel algorithm is applied in reducing the localization error of WSN in 3D terrain. CEC 2013 test suit is used to verify the performance of the novel algorithm, and the simulation results show that the novel algorithm has better search performance than other famous intelligence computing algorithms. The localization simulation experiment results reveal that the novel algorithm also has an excellent performance in solving practical problems. WSN localization 3D terrain intelligence computing rotated the black hole algorithm.