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| 1 | FEW-NNN: A Fuzzy Entropy Weighted Natural Nearest Neighbor Method for Flow-Based Network Traffic Attack Detection显示文摘Attacks such as APT usually hide communication data in massive legitimate network traffic, and mining structurally complex and latent relationships among flow-based network traffic to detect attacks has become the focus of many initiatives. Effectively analyzing massive network security data with high dimensions for suspicious flow diagnosis is a huge challenge. In addition, the uneven distribution of network traffic does not fully reflect the differences of class sample features, resulting in the low accuracy of attack detection. To solve these problems, a novel approach called the fuzzy entropy weighted natural nearest neighbor(FEW-NNN) method is proposed to enhance the accuracy and efficiency of flowbased network traffic attack detection. First, the FEW-NNN method uses the Fisher score and deep graph feature learning algorithm to remove unimportant features and reduce the data dimension. Then, according to the proposed natural nearest neighbor searching algorithm(NNN_Searching), the density of data points, each class center and the smallest enclosing sphere radius are determined correspondingly. Finally, a fuzzy entropy weighted KNN classification method based on affinity is proposed, which mainly includes the following three steps: 1、 the feature weights of samples are calculated based on fuzzy entropy values, 2、 the fuzzy memberships of samples are determined based on affinity among samples, and 3、 K-neighbors are selected according to the class-conditional weighted Euclidean distance, the fuzzy membership value of the testing sample is calculated based on the membership of k-neighbors, and then all testing samples are classified according to the fuzzy membership value of the samples belonging to each class;that is, the attack type is determined. The method has been applied to the problem of attack detection and validated based on the famous KDD99 and CICIDS-2017 datasets. From the experimental results shown in this paper, it is observed that the FEW-NNN method improves the accuracy and efficiency of flow-based network traffic attack detection. | Liangchen Chen Shu Gao Baoxu Liu Zhigang Lu Zhengwei Jiang | 2020 | China Communications2020，17，5： | 6 |
| 2 | Geographic scenario:a possible foundation for further development of virtual geographic environments显示文摘It has been two decades since virtual geographic environments(VGEs)were initially proposed.While relevant theories and technologies are evolving,data organization models have always been the foundation of VGE development,and they require further exploration.Based on the comprehensive consideration of the characteristics of VGEs,geographic scene is proposed to organize geographic information and data.We empirically find that geographic scene provides a suitable organization schema to support geo-visualization,geo-simulation,and geo-collaboration.To systematically investigate the concept and method of geographic scene,Geographic Scenario is proposed as the theory on developing geographic scene,and corresponding key issues of the Geographic Scenario are illustrated in this article.Prospects of the proposed method are discussed with the hope of informing future studies of VGEs. | Guonian Lü Min Chen Linwang Yuan Liangchen Zhou Yongning Wen Mingguan Wu Bin Hu Zhaoyuan Yu Songshan Yue Yehua Sheng | 2018 | International Journal of Digital Earth2018，11，4： | 4 |
| 3 | High pressure effects on the crystal structure andelectric conductivity of perovskite like (Ca/Sr)_2CuO_2Cl_2 compounds显示文摘The crystal structure stability as well as electric conductance of (Sr/Ca)_2CuO_2Cl_2 compound with K_2NiF_4 structure was investigated up to 31 GPa using diamond anvil technique. It seems that (Sr/Ca)_2CuO_2Cl_2 is quite stable under pressure but with obvious anisotropic compressibility. The equation of state (EOS) obtained shows relative large bulk modulus. | LIU QingQing WANG FuRen LI FengYing CHEN LiangChen YU RiCheng JIN ChangQing LI YanChun LIU Jing | 2008 | Chinese Science Bulletin2008，53，18： | 2 |
| 4 | A soft switching full bridge converter with reduced parasitic oscillation in a wide load range显示文摘 | Chen Zhong Liu Shasha Shi Liangchen | 2014 | IEEE Transactions on Power Electronics2014，29，2： | 1 |
| 5 | Structural Phase Transitions of Iodine at High Pressure显示文摘The compression and polymorphic phase transitions of iodine have been studied by using x-ray diffraction with a diamond anvil cell at high pressure up to 77GPa.Considering that iodine is reactive with iron in air,a corrosion-resisting and high-strength gasket was put between the diamonds,thus the sample can be mounted at atmospheric pressure and room temperature.Pressure was measured in terms of the ruby fluorescence and the molybdenum diffraction as an internal pressure standard.According to the x-ray diffraction results,the iodine undergoes the following three structural phase transitions with pressure increasing:(1)At 21 GPa,from base centred orthorhombic phase(phase Ⅰ)to body centred orthorhombic phase(phase Ⅱ).A 2%change in volume occurs.(2)At 44 GPa,from phase II to body centred tetragonal phase(phase Ⅲ).This is a second order phase transition.(3)At 71 GPa,from phase III to fcc phase(phase Ⅳ).The volume decreases by 3%.At this time,the volume is 45%of the original one at atmospheric pressure. | CHEN Liangchen ZHANG Zhiting CHE Rongzheng YU Tingnan WANG Jifang | 1994 | Chinese Physics Letters1994，11，2： | 0 |
| 6 | High-efficient removal of tetracycline in water via porous magnetic Ce/Fe photocomposite under visible light显示文摘Tetracycline is a typical antibiotic commonly used in various industries which is eco-toxic and quickly causes bacterial resistance.Therefo re,studying the efficient removal of tetracycline is necessary to protect the water environment.Herein,a novel Ce/Fe nanoparticle composite(1CCFO)was prepared by the sol-gel method and its removal effects of tetracycline under visible light were performed.The relationship between physicochemical properties of catalyst and photocatalytic degradation effects of tetracycline was analyzed based on a series of characterizations data such as X-ray diffraction(XRD),Raman spectro scopy,a vibrating sample magnetometer(VSM),scanning electron microscopy(SEM),Brunauer-Emmett-Teller(BET)method,X-ray photoelectron spectroscopy(XPS),and ultraviolet-visible(UV-Vis)spectroscopy.The results show that Ce/Fe photocatalyst possesses a large specific surface area,good visible light response,abundant oxygen vacancies and excellent redox performance,exhibiting good adsorption capacity,remarkable catalytic performance and stability.The optimal conditions for tetracycline removal were explored through orthogonal experiments.About 88%of tetracycline can be photodegraded in 1 h under optimal conditions.The possible decomposition pathways,main reactive oxygen species and suitable mechanism of the photocatalytic system were studied by liquid chromatography-mass spectro metry(LC-MS),an electron spin resonance(ESR)spectrometer and free radical quenching experiments.The results show that 1CCFO has an efficient degradation effect on tetracycline under visible light,which provides a feasible method to improve the performance of 1CCFO. | Weihang Han Jingxuan Shou Yifan Yang Liangchen Chen Luping Zhang Yutong Chen Xuewei Tu Dan Jin Shijie Zhang Yurong Chang Hui Zheng | 2023 | Journal of Rare Earths2023，41，10： | 0 |
| 7 | Synthesis of boron-doped diamond with laser heated diamond anvil cell显示文摘Boron-doped diamond has been synthesized from graphite mixed with different ratio of B 4 C at high pressure high temperature (HPHT) using laser heated diamond anvil cell.The starting composition was transformed to diamond compound at pressure ~9 GPa,2300-2400 K as indicated by the in-situ X-ray diffraction pattern with synchrotron radiation source.Raman spectrum of the recovered specimen from HPHT state confirmed that boron has been doped into diamond lattice. | ZHANG WeiWei CHEN LiangChen JIN ChangQing WANG XueJin LIU YuYing LIU Jing | 2011 | Chinese Science Bulletin2011，56，13： | 0 |
| 8 | Solid C_(60):Pressure Induced Phase Transitions显示文摘Based on in situ high pressure x-ray diffraction with diamond anvil cell by using synchrotron radiation and pressure-quench x-ray measurement,phase transition of C_(60)under high pressured is studied.The maximum pressure used is 30GPa in quasi-hydrostatic case but 44GPa in nonhydrostatic case.At ambient pressure,C_(60)crystal is a fcc phase with lattice parameter a=14.2086Å.It transforms from fcc to a lower symmetry phase at pressure of 13.7GPa,and then transforms to an amorphous state under pressure up to 25-30 GPa.This amorphous state is metastable at normal condition.Finally,the experimental results are discussed. | WANG Jifang WANG Lijun CHEN Liangchen CHEN Hong WANG Ruju ZHANG Zhiting CHE Rongzheng ZHOU Lei | 1993 | Chinese Physics Letters1993，10，3： | 0 |
| 9 | Toward better understanding vacuum ultraviolet-iodide induced photolysis via hydrogen peroxide formation,iodine species change,and difluoroacetic acid degradation显示文摘Recently,a photochemical process induced by ultraviolet(UV),vacuum UV(VUV),and iodide(I–)has gained attention for its robust potential for contaminant degradation.However,the mechanisms behind this process remain unclear because both oxidizing and reducing reactants are likely generated.To better understand this process,this study examined the evolutions of hydrogen peroxide(H_(2)O_(2))and iodine species(i.e.,iodide,iodate,and triiodide)during the UV/VUV/I–process under varying pH and dissolved oxygen(DO)conditions.Results show that increasing DO in water enhanced H2O2 and iodate production,suggesting that high DO favors the formation of oxidizing species.In contrast,increasing pH(from 6.0 to 11.0)resulted in lower H_(2)O_(2) and iodate formation,indicating that there was a decrease of oxidative capacity for the UV/VUV/I–process.In addition,difluoroacetic acid(DFAA)was used as an exemplar contaminant to verify above observations.Although its degradation kinetics did not follow a constant trend as pH increases,the relative importance of mineralization appeared declining,suggesting that there was a redox transition from an oxidizing environment to a reducing environment as pH rises.The treatability of the UV/VUV/I–process was stronger than UV/VUV under pH of 11.0,while UV/VUV process presented a better performance at pH lower than 11.0. | Yang Yang Qi Zhang Baiyang Chen Liangchen Long Guan Zhang | 2022 | Frontiers of Environmental Science & Engineering2022，16，5： | 0 |
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