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RISS 인기검색어
- 검색키워드
- 저자 : Hongwei Ren (검색결과 4 건)
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Automatic Extraction Method of Urban Road Curb Boundary from Vehicle-borne Laser Point Clouds
Hongwei Ren,Rufei Liu,Fei Wang,Jiben Yang 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.8
With the acceleration of urbanization, urban road networks are being extended and updated at an alarming rate. How to extract the boundary information of the urban road network efficiently and scientifically to support fine urban management has become a difficult problem. Vehicle-Borne Mobile Mapping System can quickly and efficiently obtain 3D road data, and further realize the extraction of urban road boundary. Based on the tracking information of the Vehicle-Borne Mobile Mapping System, this paper extracts contiguous laser scanning lines from vehicle-borne mobile laser scanning data. By further analyzing the spatial geometric distribution features of the point clouds on different terrain of scan lines, this paper proposes an adaptive window clustering classification method based on the scan line index to solve the problem of the automatic extraction of urban road curb boundary. Experiments are carried out on two point clouds data obtained by the vehicle-borne mobile measurement system. And the accuracy of the extraction of curbs boundary is 99%. The experiment results show that this method can effectively reduce the interference of road noise points as well as the influence of facade features on the boundary extraction of curbs and adapt to different shapes and distribution conditions of urban roads curbs.
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Hongwei Ren,Hongyu Dong,Tengda Zhao,Zhongqing Yan,Benzhen Jia,Liang Han,Jinfeng Zhang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.127 No.-
Activated carbon (AC) is one of the typical adsorbents for industrial treatment of VOCs, but AC itself has ahigh calorific value. When the heat generated by low-temperature oxidation cannot be released, it is easyto store heat and oxidize spontaneously, resulting in immeasurable harm. Therefore, it is important tostudy and improve the thermal stability of AC. In this study, Mo-doped carbon quantum dots (CQDs)was synthesized to enhance the safety of AC usage. The structure of AC before and after modificationwas characterized by transmission electron microscope (TEM), Fourier transform infrared spectroscopy(FT-IR) and X-ray diffractometer (XRD). On the modified Mo-doped CQDs/AC, there are more crystallinestructures formed by Mo oxides on the surface, which makes the intermolecular force on the surface ofAC increase. At the same time, Mo oxide has strong oxidation resistance, which can inhibit the thermaldecomposition process of AC, and has stronger stability. The spontaneous combustion tendency and thermalhazard of AC before and after modification were greatly improved. The heat released in the tolueneadsorption by the modified AC at different temperatures was significantly lower than the heat released bythe unmodified AC. According to the Langmuir adsorption isotherm, the adsorption performance of ModopedCQDs (2.5 wt%) was 1.6 times higher than that of AC when the system was 25 C. The resultsshowed that Na2MoO4 CQDs modified AC could effectively improve the thermal stability and greatlyreduce the spontaneous combustion tendency. A relative fire safety performance evaluation model wasalso established to comprehensively evaluate the fire risk of VOCs treatment by AC.
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Discrete-time Sliding Mode Control with Adaptive Reaching Law via Implicit Euler Method
Cong Wang,Hongwei Xia,Yanmin Wang,Shunqing Ren 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.1
In this paper, a novel adaptive reaching law-based discrete-time sliding mode control scheme is designed and analyzed for nonlinear disturbed systems. The higher-order sliding mode surface is used to obtain the homogeneous asymptotic accuracy of system states. The implicit Euler method is applied to the design of discrete reaching law for the first time, further to completely eliminate numerical chattering. Meanwhile, with the help of a highorder disturbance compensator, the widths of the quasi sliding mode band and attractiveness region are reduced to an adjustable order. The designed adaptive gain functions in the reaching law are able to decrease the reaching time without affecting the accuracy of sliding mode, and the finite number of steps for any initial state to enter the quasi sliding mode band is acquired. Simulation results on magnetic suspension systems are presented to validate the developed method.
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