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Lin Liu, Xiumei Zhang, Yunjia Ji and Xiuming Wang
A knowledge of wave propagation in boreholes with gas hydrate-bearing sediments, a typical three-phase porous medium, is of great significance for better applications of acoustic logging information on the exploitation of gas hydrate. To study the wave p...
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Yanyan Gao, Ming Hao, Yunjia Wang, Libo Dang and Yuecheng Guo
Underground coal fires can increase surface temperature, cause surface cracks and collapse, and release poisonous and harmful gases, which significantly harm the ecological environment and humans. Traditional methods of extracting coal fires, such as glo...
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Hongxia Qi, Yunjia Wang, Jingxue Bi, Hongji Cao and Shenglei Xu
Floor positioning is an important aspect of indoor positioning technology, which is closely related to location-based services (LBSs). Currently, floor positioning technologies are mainly based on radio signals and barometric pressure. The former are imp...
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Hongji Cao, Yunjia Wang, Jingxue Bi, Meng Sun, Hongxia Qi and Shenglei Xu
Since many Wi-Fi routers can currently transmit two-band signals, we aimed to study dual-band Wi-Fi to achieve better positioning results. Thus, this paper proposes a fingerprint positioning method for dual-band Wi-Fi based on Gaussian process regression...
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Hongji Cao, Yunjia Wang, Jingxue Bi, Shenglei Xu, Minghao Si and Hongxia Qi
WiFi-based indoor positioning methods have attracted extensive attention due to the wide installation of WiFi access points (APs). Recently, the WiFi standard was modified and introduced into a new two-way approach based on round trip time (RTT) measurem...
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Meng Sun, Yunjia Wang, Shenglei Xu, Hongji Cao and Minghao Si
This paper proposes a fusion indoor positioning method that integrates the pedestrian dead-reckoning (PDR) and geomagnetic positioning by using the genetic-particle filter (GPF) algorithm. In the PDR module, the Mahony complementary filter (MCF) algorith...
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Zhoutuo Tan, Yunjia Yao, Chengning Yao, Jiapei Yang, Yougang Ruan and Qiuwang Wang
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