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- 저자 : Feng Yafei (검색결과 6 건)
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Electrostatic Discharge Characteristics of Cable Discharge Event
Yu Zhang,Yafei Yuan,Xiaoqing Li,Ming Yang,Na Feng,Ziwei Lu,Jihao He,Qizheng Ji 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.1
The characteristics of cable electrostatic discharge event are investigated, which has been proved to be a hazard leading to ESD damage. The electrostatic voltage under operations on cable is measured and the effects of the discharge parameters including electrostatic voltage, cable length, cable type and the distance to the ground on cable discharge event (CDE) are studied experimentally. The CDE current waveform appears as a sequence of oscillating rectangular pulses with fast rising time, short pulse width but high amplitude. The current amplitude linearly increases with the electrostatic voltage, while the pulse width is mainly determined by the cable length. The distance to the ground and the cable type has little influence once the distance is relatively large. The discharge by cable with multiple cores is also investigated. Theoretical discussion is made to explain the phenomenon and its mechanism.
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Image Fusion and Evaluation by using Mapping Satellite-1 Data
He Huang,Yafei Hu,Yi Feng,Meng Zhang,송동섭 한국측량학회 2013 한국측량학회지 Vol.31 No.6
China’s Mapping Satellite-1, developed by the China Aerospace Science and Technology Corporation (CASC),was launched in three years ago. The data from Mapping Satellite-1 are able to use for efficient surveyingand geometric mapping application field. In this paper, we fuse the panchromatic and multispectral images ofChangchun area, which are obtained from the Mapping Satellite-1, the one that is the Chinese first transmissiontypethree-dimensional mapping satellite. The four traditional image fusion methods, which are HPF, Mod.IHS,Panshar and wavelet transform, were used to approach for effectively fusing Mapping Satellite-1 remote sensingdata. Subsequently we assess the results with some commonly used methods, which are known a subjectivequalitative evaluation and quantitative statistical analysis approach. Consequently, we found that the wavelettransform remote sensing image fusion is the optimal in the degree of distortion, the ability of performance ofdetails and image information availability among four methods. To further understand the optimal methods tofuse Mapping Satellite-1 images, an additional study is necessary.
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Image Fusion and Evaluation by using Mapping Satellite-1 Data
Huang, He,Hu, Yafei,Feng, Yi,Zhang, Meng,Song, DongSeob Korean Society of Surveying 2013 한국측량학회지 Vol.31 No.6
China's Mapping Satellite-1, developed by the China Aerospace Science and Technology Corporation (CASC), was launched in three years ago. The data from Mapping Satellite-1 are able to use for efficient surveying and geometric mapping application field. In this paper, we fuse the panchromatic and multispectral images of Changchun area, which are obtained from the Mapping Satellite-1, the one that is the Chinese first transmission-type three-dimensional mapping satellite. The four traditional image fusion methods, which are HPF, Mod.IHS, Panshar and wavelet transform, were used to approach for effectively fusing Mapping Satellite-1 remote sensing data. Subsequently we assess the results with some commonly used methods, which are known a subjective qualitative evaluation and quantitative statistical analysis approach. Consequently, we found that the wavelet transform remote sensing image fusion is the optimal in the degree of distortion, the ability of performance of details and image information availability among four methods. To further understand the optimal methods to fuse Mapping Satellite-1 images, an additional study is necessary.
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Shuying Dong,Xuanxuan Yan,Wenli Li,Yafei Liu,Xiaoxu Han,Xiaodan Liu,Jinglan Feng,Chongfei Yu,Chunyan Zhang,Jianhui Sun 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.108 No.-
In order to obtain a robust, durable and efficient heterogeneous catalyst, macroscopic monolithic Zndopeda-Fe2O3/graphene aerogel (GA) hybrid architecture with integrated morphology and hierarchicallyporous structure were controllably synthesized via a facile in-situ hydrothermal method and then used aspersulfate (PS) activator for sulfamonomethoxine (SMM) wastewater purification. Several key reactionparameters including the initial SMM concentration, reaction temperature, coexisting inorganic anionsand SMM in real natural water samples had different influence on the SMM removal efficiency. The catalyticefficiency of Zn-doped a-Fe2O3/GA with the molar ratio of Fe/Zn = 2:1.5 was about 66%, 62%, 66%and 11%33% higher than that of GA, a-Fe2O3/GA, Zn/GA and other Fe/Zn molar ratio. The improvedactivity of Fe/Zn = 2:1.5 benefits from the synergistic effects of the sp2 hybridized carbon and porousframework, as well as the surface oxygenic functional groups, which accelerate the pollutant/oxidant dispersionand electron transfer. Electron paramagnetic resonance results indicate that OH, 1O2 and SO4radicals account for the catalytic degradation of SMM and the activation of PS in present system is differentfrom conventional homogeneous systems, and speculate mechanism was proposed based on theobtained data.
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Occlusal deviations in adolescents with idiopathic and congenital scoliosis
Zhang Hao,Ma Jingbo,Zhang Zhicheng,Feng Yafei,Cai Chuan,Wang Chao 대한치과교정학회 2022 대한치과교정학회지 Vol.52 No.3
Objective: This cross-sectional study aimed to investigate the characteristics of malocclusions in scoliotic patients through clinical examinations. Methods: Fifty-eight patients with idiopathic scoliosis (IS) and 48 patients with congenital scoliosis (CS) participated in the study. A randomly selected group of 152 orthopedically healthy children served as the control group. Standardized orthodontic and orthopedic examination protocols were used to record the occlusal patterns and type of scoliosis. Assessments were made by three experienced orthodontists and a spinal surgery team. The differences in the frequency distribution of occlusal patterns were evaluated by the chi-squared test. Results: In comparison with patients showing IS, patients with CS showed a higher incidence of Cobb angle ≥ 45° (p = 0.020) and included a higher proportion of patients receiving surgical treatments (p < 0.001). The distribution of the Angle Class II subgroup was significantly higher in the IS (p < 0.001) and CS (p = 0.031) groups than in the control group. In comparison with the healthy controls, the CS and IS groups showed significantly higher (p < 0.05) frequencies of asymmetric molar and asymmetric canine relationships, upper and lower middle line deviations, anterior deep overbite, unilateral posterior crossbite, and canted occlusal plane, with the frequencies being especially higher in CS patients and to a lesser extent in IS patients. Conclusions: Patients with scoliosis showed a high frequency of malocclusions, which were most obvious in patients with CS.
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