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A Text Similarity Measurement Method Based on Singular Value Decomposition and Semantic Relevance
Li, Xu,Yao, Chunlong,Fan, Fenglong,Yu, Xiaoqiang Korea Information Processing Society 2017 Journal of information processing systems Vol.13 No.4
The traditional text similarity measurement methods based on word frequency vector ignore the semantic relationships between words, which has become the obstacle to text similarity calculation, together with the high-dimensionality and sparsity of document vector. To address the problems, the improved singular value decomposition is used to reduce dimensionality and remove noises of the text representation model. The optimal number of singular values is analyzed and the semantic relevance between words can be calculated in constructed semantic space. An inverted index construction algorithm and the similarity definitions between vectors are proposed to calculate the similarity between two documents on the semantic level. The experimental results on benchmark corpus demonstrate that the proposed method promotes the evaluation metrics of F-measure.
Design and Synthesis of Acid-resistant Zeolite T/NaY Composite Membrane for Water/Ethanol Separation
Xiangbo Li,Zhihui Zhou,Liang Chen,Chunlong Kong,Hongbin Du 대한화학회 2019 Bulletin of the Korean Chemical Society Vol.40 No.6
The random distribution of zeolite T on the porous α-Al2O3 tube during growth greatly limits its application in the industry. In this study, the defective zeolite T layer is modified with zeolite NaY. A continuous and dense zeolite T/NaY composite membrane is obtained through characterization by scanning electron microscope and X-ray diffraction. The resulting composite membrane exhibits high selectivity and high permeation flux for 90?wt % ethanol/water solution at 75 °C. Water concentration in the permeation side of the as-synthesized zeolite T/NaY composite membrane is >99.9 wt %, whereas that of primary zeolite T layer is only 60.4 wt %. The water permeation flux of the composite membrane reaches 4.35?kg/m2/h1. The composite membrane displays good stability in acid solution when the pH of the solution is >5.
A Text Similarity Measurement Method Based on Singular Value Decomposition and Semantic Relevance
( Xu Li ),( Chunlong Yao ),( Fenglong Fan ),( Xiaoqiang Yu ) 한국정보처리학회 2017 Journal of information processing systems Vol.13 No.4
The traditional text similarity measurement methods based on word frequency vector ignore the semantic relationships between words, which has become the obstacle to text similarity calculation, together with the high-dimensionality and sparsity of document vector. To address the problems, the improved singular value decomposition is used to reduce dimensionality and remove noises of the text representation model. The optimal number of singular values is analyzed and the semantic relevance between words can be calculated in constructed semantic space. An inverted index construction algorithm and the similarity definitions between vectors are proposed to calculate the similarity between two documents on the semantic level. The experimental results on benchmark corpus demonstrate that the proposed method promotes the evaluation metrics of F-measure.
Shaojun Bai,Chunlong Li,Xiangyu Fu,Jian Liu,Shuming Wen 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.61 No.-
The interaction between sulfide-ion species and smithsonite surfaces in the absence with and without ammonia liquor was investigated. The results of zeta potential and sulfide ion adsorption indicated that NH3·H2O addition promoted the transfer of sulfur in the pulp solutions onto the smithsonite surfaces. Time-of-flight secondary ion mass spectrometry and X-ray photo-electron spectroscopy analysis indicated that the zinc sulfide species was composed of zinc monosulfide and zinc polysulfide and was reinforced by NH3·H2O addition. The distribution ratio of polysulfide in the whole S species increased. The results shed light on reinforcement of the smithsonite sulfidation mechanism with ammonia liquor addition.
Improvement of OPW-TR Algorithm for Compressing GPS Trajectory Data
( Qingbin Meng ),( Xiaoqiang Yu ),( Chunlong Yao ),( Xu Li ),( Peng Li ),( Xin Zhao ) 한국정보처리학회 2017 Journal of information processing systems Vol.13 No.3
Massive volumes of GPS trajectory data bring challenges to storage and processing. These issues can be addressed by compression algorithm which can reduce the size of the trajectory data. A key requirement for GPS trajectory compression algorithm is to reduce the size of the trajectory data while minimizing the loss of information. Synchronized Euclidean distance (SED) as an important error measure is adopted by most of the existing algorithms. In order to further reduce the SED error, an improved algorithm for open window time ratio (OPW-TR) called local optimum open window time ratio (LO-OPW-TR) is proposed. In order to make SED error smaller, the anchor points are selected by calculating point`s accumulated synchronized Euclidean distance (ASED). A variety of error metrics are used for the algorithm evaluation. The experimental results show that the errors of our algorithm are smaller than the existing algorithms in terms of SED and speed errors under the same compression ratio.
Mining Frequent Spatio-Temporal Items in Trajectory Data
Fengjiao Yin,Xu Li,Chunlong Yao,Lan Shen 보안공학연구지원센터 2015 International Journal of Database Theory and Appli Vol.8 No.4
The time aspect is not currently taken into account for finding a region of interesting (ROI) or a hot region, so that due to the time to visit frequently a place cannot be determined, it is difficult to discover the visiting regularity for a moving object. To this end, the spatio-temporal item (STI) and frequent spatio-temporal item (FSTI) integrated spatial and temporal attributes are defined. The FSTIs can represent a moving object often visits which area in what time, which can provide more useful information to improve the level of the location-based services(LBS). In order to find FSTIs, STIs are generated by using a density-based clustering algorithm to recognize the stay regions of objects, and then the STIs are mapped to 3D-grids integrated spatial and temporal dimensions. Finally, the extraction - merger strategy is used on the frequent grid cells to recombine the FSTIs. Experimental results on real dataset show that the approach proposed for mining FSTIs is effective.
Yue Weiming,Zhang Shengxue,Li Chunlong,Jiang Tiancai,Liu Lubei,Wang Ruoxu,Huang Yulu,Tan Teng,Guo Hao,Zaplatin Evgeny,Xiong Pingran,Wu Andong,Wang Fengfeng,Zhang Shenghu,Huang Shichun,He Yuan,Yao Zeen 한국원자력학회 2020 Nuclear Engineering and Technology Vol.52 No.8
As a part of R&D work for the high intensity proton linac of China Accelerator Driven Sub-critical System project, a superconducting half-wave cavity with a frequency of 162.5 MHz and an optimal beta of 0.15 (HWR015) has been developed at Institute of Modern Physics (IMP), Chinese Academy of Sciences. In this paper, the design and test results will be described in detail. We introduced a new stiffening strategy for the HWR cavity, the simulation results show that the cavity has much lower frequency sensitivity coefficient (df/dp), Lorentz force detuning coefficient (KL), and can achieve more stable mechanical properties. The performance of the HWR cavity operated in cryostat will be also reported.
Improvement of OPW-TR Algorithm for Compressing GPS Trajectory Data
Meng, Qingbin,Yu, Xiaoqiang,Yao, Chunlong,Li, Xu,Li, Peng,Zhao, Xin Korea Information Processing Society 2017 Journal of information processing systems Vol.13 No.3
Massive volumes of GPS trajectory data bring challenges to storage and processing. These issues can be addressed by compression algorithm which can reduce the size of the trajectory data. A key requirement for GPS trajectory compression algorithm is to reduce the size of the trajectory data while minimizing the loss of information. Synchronized Euclidean distance (SED) as an important error measure is adopted by most of the existing algorithms. In order to further reduce the SED error, an improved algorithm for open window time ratio (OPW-TR) called local optimum open window time ratio (LO-OPW-TR) is proposed. In order to make SED error smaller, the anchor points are selected by calculating point's accumulated synchronized Euclidean distance (ASED). A variety of error metrics are used for the algorithm evaluation. The experimental results show that the errors of our algorithm are smaller than the existing algorithms in terms of SED and speed errors under the same compression ratio.
Design and Test Result of a Superconducting Double-Spoke Cavity
Tiancai Jiang,Yulu Huang,Shengxue Zhang,Lubei Liu,Pingran Xiong,Chunlong Li,Hao Guo,Weiming Yue,Shenghu Zhang,Yuan He 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.3
Superconducting multi-spoke cavities are outstanding alternative choice for acceleration of heavy ions inmedium velocity regimes. Based on the scheme of China ADS, several researches on the superconductingdouble-spoke cavities were done and two prototype cavities have been developed. In this paper, the RFdesign, the mechanical design and fabrication considerations of the bare cavity will be described indetail. After Buffered Chemical Polishing and High Pressure Rinsing, one of the prototype cavities wasinstalled into the Vertical Test Stand for high gradient RF testing at 4.2 K. The measurement results of thequality factor as a function of the accelerating field and the maximum surface field will be presented. Anaccelerating gradient of more than 15 MV/m is achieved during the test, with maximum surface electricfield of 58 MV/m, and maximum surface magnetic field of 117 mT
Low beta superconducting cavity system design for HIAF iLinac
Mengxin Xu,Yuan He,Shengxue Zhang,Lubei Liu,Tiancai Jiang,Zehua Liang,Tong Liu,Yue Tao,Chunlong Li,Qitong Huang,Fengfeng Wang,Hao Guo,Feng Bai,Xianbo Xu,Shichun Huang,Xiaoli Li,Zhijun Wang,Shenghu Zha Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.7
A superconducting ion-Linac (iLinac), which is supposed to work as the injector in the High Intensity heavy-ion Accelerator Facility project, is under development at the Institute of Modern Physics (IMP), Chinese Academy of Sciences. The iLinac is a superconducting heavy ion linear accelerator approximately 100 meters long and contains 96 superconducting cavities in two types of 17 cyromodules. Two types of superconducting resonators (quarter-wave resonators with a frequency of 81.25 MHz and an optimal beta β = v/c = 0.07 called QWR007 and half-wave resonators with a frequency of 162.5 MHz and an optimal beta β = 0.15 called HWR015) have been investigated. The cavity design included extensive multi-parameter electromagnetic simulations and mechanical analysis, and its results are described in details. The fundamental power coupler and cavity dynamic tuner designs are also presented in this article. The prototypes are under manufacturing and expected to be ready in 2023.