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- 저자 : Ziye Chen (검색결과 6 건)
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Measurements of pedestrian’s ioad using smartphones
Ziye Pan,Jun Chen 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.63 No.6
The applications of smartphones or other portable smart devices have dramatically changed people‟s lifestyle. Researchers have been investigating useage of smartphones for structural health monitoring, earthquake monitoring, vibration measurement and human posture recognition. Their results indicate a great potential of smartphones for measuring pedestrianinduced loads like walking, jumping and bouncing. Smartphone can catch the device‟s motion trail, which provides with a new method for pedestrain load measurement. Therefore, this study carried out a series of experiments to verify the application of the smartphone for measuring human-induced load. Shaking table tests were first conducted in order to compare the smartphones‟ measurements with the real input signals in both time and frequency domains. It is found that selected smartphones have a satisfied accuracy when measuring harmonic signals of low frequencies. Then, motion capture technology in conjunction with force plates were adopted in the second-stage experiment. The smartphone is used to record the acceleration of center-of-mass of a person. The human-induced loads are then reconstructed by a biomechanical model. Experimental results demonstrate that the loads measured by smartphone are good for bouncing and jumping, and reasonable for walking
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Experimental validation of smartphones for measuring human-induced loads
Jun Chen,Huan Tan,Ziye Pan 국제구조공학회 2016 Smart Structures and Systems, An International Jou Vol.18 No.3
The rapid technology developments in smartphones have created a significant opportunity for their use in structural live load measurements. This paper presents extensive experiments conducted in two stages to investigate this opportunity. Shaking table tests were carried out in the first stage using selected popular smartphones to measure the sinusoidal waves of various frequencies, the sinusoidal sweeping, and earthquake waves. Comparison between smartphone measurements and real inputs showed that the smartphones used in this study gave reliable measurements for harmonic waves in both time and frequency domains. For complex waves, smartphone measurements should be used with caution. In the second stage, three-dimensional motion capture technology was employed to explore the capacity of smartphones for measuring the movement of individuals in walking, bouncing and jumping activities. In these tests, reflective markers were attached to the test subject. The markers\' trajectories were recorded by the motion capture system and were taken as references. The smartphone measurements agreed well with the references when the phone was properly fixed. Encouraged by these experimental validation results, smartphones were attached to moving participants of this study. The phones measured the acceleration near the center-of-mass of his or her body. The human-induced loads were then reconstructed by the acceleration measurements in conjunction with a biomechanical model. Satisfactory agreement between the reconstructed forces and that measured by a force plate was observed in several instances, clearly demonstrating the capability of smartphones to accurately assist in obtaining human-induced load measurements.
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Two new false click-beetles from China (Coleoptera: Elateroidae: Eucnemidae)
Meng Ziye,Muona Jyrki,Ruan Yongying,Chen Xiaoqin,Jiang Shihong 한국응용곤충학회 2023 Journal of Asia-Pacific Entomology Vol.26 No.2
Thambus planifrons Muona & Meng sp. nov. and Otho rutriclypeus Muona & Meng sp. nov. are described from China. Both genera are recorded for the first time from China. Except for the European T. friwaldszkyi Bonvouloir, 1871, and the Japanese T. curvicaria Hisamatsu, 1956, all other previously known species belonging to Otho were from the Americas. Eight Otho species have been described from disparate parts of Asia earlier. urn:lsid:zoobank.org:pub:10B667F6-F11E-454B-9653-D66A2D7ABFA1.
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A novel vibration isolator for vibrating screen based on magnetorheological damper
Mingzhuang Wu,Fei Chen,Aimin Li,Ziye Chen,Nana Sun 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.10
A vibrating screen is widely used in raw coal screening, but intensive resonance in the startup and shutdown stages shortens the service life of the vibrating screen and generates vibration damage to surrounding buildings. Therefore, we designed a novel vibration isolator based on a magnetorheological damper, aiming to improve the vibration isolation performance of the vibrating screen. The rheological mechanical model of damping force was analyzed based on the Bingham model, and a magnetic circuit was designed according to electromagnetic theory. Then, an experiment was designed to evaluate the vibration isolation performance of the vibration isolator. The results show that the novel vibration isolator, compared with the metal spring ones, reduces the maximum resonance amplitude by 64 % in the resonance region. In addition, the time of passing through the resonance region in startup and shutdown stages is also reduced by 50 % and 60 %, respectively. This study can provide a new method to improve the vibration isolation performance of vibrating screens.
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Multi-focus Image Fusion Based on Random Walk
Wang Zhaobin,Wang Ziye,Cui Zijing,Chen Lina,Zhang Yaonan 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.6
An effective multi-focus image fusion algorithm based on random walk is proposed in this paper. Random walk and guided filter have attracted extensive attention in image fusion. Random walk is usually used to solve probability problems and it has a good smoothing effect, and guided filter can preserve the gradient information of the image well. The combination of two algorithms can better retain the edge information of the input image. Six sets of source images and five existing methods are used in the experiment and the experimental results show that the proposed algorithm outperforms the existing methods in both subjective and objective evaluation.
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Deng Shuping,Jiang Xianyan,Zhang Ziye,Liu Junjie,Chen Lili,Qi Ning,Tang Xinfeng,Wu Yichu,Chen Zhiquan 한국물리학회 2021 Current Applied Physics Vol.26 No.-
In this paper, a series of CuIn1-xGaxTe2 samples were prepared by vacuum melting combined with the spark plasma sintering process based on the initial stoichiometric ratios of 1: 1-x: x: 2 (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 and 1.0). Crystal results indicate that all Cu(In, Ga)Te2 system samples are the chalcopyrite structure with space group I42d. Thermal analysis results show that all the samples have excellent reproducibility and thermal stability. EPMA data indicates that Ga tended to replace In site instead of Cu or Te. Meanwhile, the roomtemperature carrier concentration of all p-type samples varies from 0.30 × 1019 to 1.25 × 1019cm 3, since carrier mobility changes from 15.16 to 69.27 cm2 V 1 s 1. Ultimately, the significantly reduced total thermal conductivity is observed in the Ga-doped samples, and the maximum ZT value of 0.80 is obtained at 773 K for the CuIn0.8Ga0.2Te2 sample due to the lower thermal conductivity
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