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A Survey of Temporal Planning
Rao Dong-ning, Yang Jin-peng, Liu Yue-chang
Journal of Guangdong University of Technology. 2021, 38 (03): 9-16.
DOI: 10.12052/gdutxb.200127
Automated planning is an important branch of artificial intelligence, which can be widely used in robot, industrial production, and commercial fields. A review is conducted on the temporal planning, which is a frontier and sub-area of automated planning, from three aspects: 1) temporal feature; 2) planning method; 3) applications. The conclusions are: 1) comparing with planning ability, the community has proposed sufficient temporal features; 2) for the time being, state space forward searching based on heuristics is our best choice; 3) researchers are still looking for more and better applications. This survey aims to provide basic concepts for students who are interested in temporal planning.
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A Semi-supervised Two-view Multiple-Instance Clustering Model
Cai Hao, Liu Bo
Journal of Guangdong University of Technology. 2021, 38 (03): 22-28,47.
DOI: 10.12052/gdutxb.200120
A novel semi-supervised two-view multi-instance clustering model is proposed, which bands text-view with image-view and solves the multi-instance image clustering problem with a small amount of label. Firstly, the proposed model embeds Concept Factorization and multi-instance kernel into a joint framework, which learns the association matrix of each view and the cluster indicator matrix shared by both views. Then, a ${l_{2, 1}}$-norm is applied to learn the optimal association matrix and cluster indicator matrix. Furthermore, to enhance the discriminability between bags, the proposed model enforces the similarity of the cluster indicators for the bag with the same label to approximate 1 and the similarity with different labels to 0. Finally, an iterative updating algorithm is derived to solve the proposed model. The experimental results show that the proposed model is superior to other multi-instance clustering models.
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A Fast Inter-prediction Mode Selection Algorithm Based on Motion Characteristics
Peng Tong-zhuang, Liu Li-cheng, Yang Guan-shui
Journal of Guangdong University of Technology. 2021, 38 (03): 36-41.
DOI: 10.12052/gdutxb.200066
High-efficiency video coding (High Efficiency Video Coding, HEVC) inter-prediction part has a high computational complexity. In order to reduce the coding time complexity, a fast algorithm for inter-prediction is proposed based on depth characteristics. First, the inter-frame PU (Prediction Unit, PU) mode is classified into regular and irregular blocks; then the method is used to define the content complexity of the current CTU (Coding Tree Unit, CTU); finally, the coded depth is divided into SD and HD regions. The SD region is only divided into rules. According to the complexity of the current CTU, the HD region is used to traverse the complex blocks in an irregular manner, and the simple blocks are divided into rules to achieve a fast encoding algorithm. Experimental results show that compared with HM16.9, the proposed algorithm reduces the encoding time, respectively, by 28.6% and 23.8% under low latency and random access configurations and the encoding performance is unaffected.
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I-Q Balanced Photoelectric Coding and Decoding Method of Grating Ruler
Cao Zhan-xin, Gu Yu-da, Zhou Yan-zhou
Journal of Guangdong University of Technology. 2021, 38 (03): 42-47.
DOI: 10.12052/gdutxb.200136
As an important device for displacement, velocity and acceleration measurement, gratings are widely used in high-precision, high-speed automated CNC feedback closed-loop systems. In order to enhance the reliability of high-speed measurement, a linear encoder with I-Q balanced photoelectric coding and decoding method is proposed. The main grating and the indicating grating are placed in parallel, and the difference in grating constant forms a moiré fringe. Each photodiode of the photodetection unit is an independent detection channel, which is distributed according to the relative phase position of the moiré fringe at a fixed spatial frequency, and is amplified by an independent DC operational amplifier circuit designed according to the I-Q balanced encoding and decoding equation. I-Q balanced encoding and decoding equation conditions are respectively sent to the 2-way adder, and the output of the adder is the standard and general 2-way I-Q quadrature signal, which is in line with the standard for automation equipment. This method comprehensively enhances the automatic numerical control closed-loop system's anti-grating surface pollution, anti-photodiode distribution position error and anti-low-frequency vibration ability, and is an efficient, reliable, and practical grating technology.
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Robust H ∞ Synchronization for a Class of Complex Networks with Multi-weights under Impulsive Control
Zheng Zi-zhao, Peng Shi-guo, Fu Zhi-wen, Xu Yun-jian
Journal of Guangdong University of Technology. 2021, 38 (03): 55-61.
DOI: 10.12052/gdutxb.200085
Based on the impulsive control method, a robust H ∞ synchronization problem for a class of complex networks with multi-weights is studied, and a novel distributed impulsive controller is designed. By adding the error state feedback item between the node state variable and the synchronous state in the traditional distributed impulsive controller, the robust H ∞ synchronization of the complex networks with multi-weights are guaranteed when they were affected by external interference. Based on the stability theory of Lyapunov, mathematical induction and other relevant knowledge, the sufficient conditions for networks to achieve robust H ∞ synchronization is given in the form of linear matrix inequalities (LMIs). Finally, a numerical simulation verifies the validity of the conclusion.
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Location and Capacity of Electric Vehicle Charging Station Based on Voronoi Diagram and Improved Gravity Search Algorithm
Zhao Bing-yao, Chen Jing-hua, Guo Jing-tao, Chen You-peng, Zhang Zhao-xuan
Journal of Guangdong University of Technology. 2021, 38 (03): 72-78.
DOI: 10.12052/gdutxb.200095
Considering the characteristics of location and capacity problems such as multi-variable, multi-constrained, high-dimensional and nonlinear, a method based on Voronoi diagram and improved gravitational search algorithm (IGSA) is proposed. Considering both subjective and objective weights, a multi-objective decision model considering construction costs, operation costs, user charging time costs and distribution network loss costs is established. In order to solve the slow convergence and the inadequate accuracy of standard gravitational search algorithm (GSA), a chaotic map is introduced in the particle initialization and updating phase to enhance the ergodicity of the algorithm. At the same time, a global optimal point to guide speed updating formula is introduced to improve the ability of the algorithm to jump out of the local optimal. Voronoi diagram is used to divide service area of charging station, and a joint solution process of Voronoi diagram and IGSA is proposed. The simulation results prove the feasibility and validity of the model.
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A Study of the Factors Influencing the Degradation of Metoprolol by UV-LED Combined with Sodium Hypochlorite
Wang Si-si, Liu Li-fan, Li Shao-feng, Ran Zhi-lin
Journal of Guangdong University of Technology. 2021, 38 (03): 79-85.
DOI: 10.12052/gdutxb.200117
Using UV-LED / Cl2 Advanced Oxidation Process to study the degradation of metoprolol (MTP), one of the β-blocker, the effects of light intensity, chlorine dosage, pH, TBA and other factors on the degradation of MTP are investigated. Studies have shown that UV-LED / Cl2 can effectively remove MTP by synergy. The MTP degradation during UV-LED / Cl2 treatment satisfies pseudo-first-order kinetics, and the pseudo-first-order rate constants of MTP (k obs ) increases with the UV-LED light intensity and the pH of the solution. With the increase of the chlorine dose, the k obs of MTP increases first and then decreases. The k obs of MTP decreases with the increase of the initial concentration of MTP and TBA, and TBA has a strong inhibitory effect on MTP degradation during UV-LED / Cl2 treatment.
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A Research on Inverter Air Conditioning System with Liquid-Vapor Separation
Xia Kuan, Chen Jian-yong, Xu Jia-cheng, Li Xu-xiong, Guo Chang-xu, Chen Ying, Luo Xiang-long
Journal of Guangdong University of Technology. 2021, 38 (03): 86-90.
DOI: 10.12052/gdutxb.200130
The implementation of liquid-vapor separation in the phase change process can achieve heat transfer enhancement. Liquid-vapor separation was applied to inverter air conditioning system. The optimal refrigerant charge amount and capillary length of the system were obtained through matching experiments. At the standard operating condition, the obtained EER and COP are 2.57 and 3.68, respectively. The system performance is also examined under different cooling and heating conditions. The annual performance factor (APF) of actual operation in different cities was compared to reflect the actual operating performance of the system. The results showed that the highest APF value was in Tengchong, at 3.67, and the lowest in Shenyang, at 2.81. It shows that the performance of the system varies significantly in different cities. Moreover, the performance at the standard operating condition largely differentiates that at the actual conditions.
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An Elevation Accuracy Analysis of AW3D30, SRTM3 and ASTER GDEM under Different Terrain Conditions
Wei De-hong, Cui Jia-wu
Journal of Guangdong University of Technology. 2021, 38 (03): 91-96.
DOI: 10.12052/gdutxb.200152
The elevation accuracy of AW3D30 SRTM3 v4.1 and ASTER GDEM V3 are analyzed through the area of the mountainous hills in parts of Guangdong. The data of 730 km lines along Guangzhou, Huizhou, Shaoguan and Qingyuan are collected by vehicle dynamic PPP, the WGS84 coordinates of dynamic points calculated by CSRS-PPP positioning service system, geodetic height of dynamic points converted into normal height by gravity field model EIGEN-6C4, and finally, the elevation of three digital elevation models are checked. The results show that the average errors of AW3D30, SRTM3 v4.1 and ASTER GDEM V3 are, respectively, 0.55, 0.17 and 1.59 m, and the root mean square 3.78, 5.84 and 8.88 m. The average error amplitude of AW3D30 in different altitudes is relatively small, within 2.18 m; the average error of SRTM3 v4.1 has a negative correlation with altitude, and the average error gradually changes from positive value to negative value with the increase of altitude; the average error of ASTER GDEM V3 is within (0 m, 2.18 m] altitude range and is about 2 m and -2.28 m in (250 m, 800 m] range. The root mean square error and standard deviation of AW3D30 decrease with the increase of altitude, while SRTM3 v4.1 increases with the increase of altitude. ASTER GDEM V3 has no significant rule, which is better than 7.69 m in (100 m, 250 m], and better than 9.86 m in other regions.
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A Study of the Relationship Between Permeability and Pore Structure of Lime-treated Loess
Zhang Xue-jiao, Liu Pan, Yang Xue-qiang, Wang Yang
Journal of Guangdong University of Technology. 2021, 38 (03): 97-103.
DOI: 10.12052/gdutxb.200070
Soil is a kind of geotechnical engineering material with porous media, and the microscopic pore structure determines macroscopic permeability. To investigate the responsibility between permeability characteristics and pore structure, the falling-head permeability tests at various lime contents are carried on lime-treated loess firstly, and then the Scanning Electron Microscope (SEM) is conducted on some typical specimens which use the Image Pro Plus 6.0 (IPP) Image processing software to count the microscopic pore structure parameters of the improved loess at various lime contents, and, by combining the results of the laboratory permeability test, establish the connection between the macroscopic permeability characteristics and the microscopic pore structure. The results show that with the increase of the lime contents, the crystalline cement filling the large and medium pores is increasing, corresponding to the number, area, surface porosity of the large and medium pores and average diameter of the large pores in the microscopic image are gradually reduced, but the number and area of small and micro pores and the fractal dimension of pores are on the rise, and the pore structure tends to be complicated, which reduces the proportion of effective seepage channels. Therefore the permeability of the soil is reducing. It is indicated that microscopic pore structure parameters are closely related to macroscopic physical properties, which can reflect changes in macroscopic physical properties to a certain extent.
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Application of Spatial Analysis Technology in the Prophase Planning of Characteristic Town — A Case Study of Qiantan Town in Jiande City
Li Ruo-jia, Zhang Yi-ling, He Shao-ying
Journal of Guangdong University of Technology. 2021, 38 (03): 104-110.
DOI: 10.12052/gdutxb.200060
The construction of characteristic towns has been spread out in China, which is an important breakthrough in the current urban-rural integration. At present, there are many problems in the prophase planning of characteristic town, such as the lack of objective quantitative analysis and the difficulty of providing more scientific basis and support for the planning and design. Combining the advantages of spatial analysis technology with the needs of planning and design, the application and development of spatial analysis technology in the prophase planning of characteristic town are explored. Taking the planning of Qiantan characteristic town in Jiande City of Zhejiang Province as an example, the geographic information system (GIS) is used for terrain analysis, multi factor land suitability and value analysis, three-dimensional skyline analysis, and the spatial syntax is used for the overall and local traffic network analysis and visual field analysis to establish the scientific basis and technical support for the prophase planning of the characteristic town.
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