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| 1 | 基于ν-SVR算法的边坡稳定性预测显示文摘提出基于一种改进支持向量机算法(ν-SVR)的边坡稳定性预测方法,直接利用边坡的特征参数快速预测边坡稳定性。为解决算法中模型选择困难的问题,用留一法设计预测模型,用网格搜索法搜索最优参数。留一法可以避免传统方法中根据经验确定预测模型的缺点,较为客观地获取合适的预测模型。网格搜索法可以保证搜索到合适的参数。计算结果显示,联合运用这两种方法可以获得合适的预测模型。利用该预测模型对82个圆弧破坏边坡实例中的71个实例进行学习,对另外11个实例进行推广预测,取得了较好的效果,其预测精度明显优于一种改进BP神经网络算法和常规SVR算法,与GA-BP神经网络算法相近。在此基础上,提出基于ν-SVR算法的边坡设计方法,能够快速、准确的获取不同方案下的边坡安全系数,评价其稳定性,为选择经济合理的边坡设计方案提供决策依据。 | 余志雄 周创兵 李俊平 史超 | 2005 | 岩石力学与工程学报2005，24，14： | 38 |
| 2 | Nonlinear singular vectors and nonlinear singular values显示文摘A novel concept of nonlinear singular vector and nonlinear singular value is introduced, which is a natural generalization of the classical linear singular vector and linear singular value to the nonlinear category. The optimization problem related to the determination of nonlinear singular vectors and singular values is formulated. The general idea of this approach is demonstrated by a simple two-dimensional quasigeostrophic model in the atmospheric and oceanic sciences. The advantage and its applications of the new method to the predictability, ensemble forecast and finite-time nonlinear instability are discussed. This paper makes a necessary preparation for further theoretical and numerical investigations. | 穆穆 | 2000 | Science China Earth Sciences2000，43，4： | 37 |
| 3 | 基于隐含语义分析的微博话题发现方法显示文摘随着微博的大量普及和关注度的不断提高,微博热点话题发现已成为当前研究热点。针对于短文本、向量空间模型(VSM)文本表示方法存在高维度、稀疏,以及同义多义问题,导致难以准确度量文本相似度,提出一种基于隐含语义分析的两阶段聚类话题发现方法。引入话题热度的概念来选取具有一定关注度的微博文本,用隐含语义分析(LSA)对数据集进行建模;用层次聚类的CURE算法确定初始类中心;用K-means聚类得到热点话题的聚类结果。真实微博数据集的实验结果验证了该方法的有效性。 | 马雯雯 魏文晗 邓一贵 | 2014 | 计算机工程与应用2014，50，1： | 35 |
| 4 | Retrieval of global terrestrial solar-induced chlorophyll fluorescence from TanSat satellite显示文摘The first Chinese Carbon Dioxide Observation Satellite Mission(TanSat), which was launched on December 21, 2016, is intended to measure atmospheric CO_2 concentration.The high spectral resolution(0.044 nm) and high SNR(360 at 15.2 mW m^(-1) sr^(-1) nm^(-1)) measurements in the region of the O_2-A band of the Atmospheric Carbon dioxide Grating Spectroradiometer(AGCS) module onboard TanSat make it possible to retrieve solar-induced chlorophyll fluorescence(SIF) from TanSat observations at the global scale.This paper aims to explore the potential of the TanSat data for global SIF retrieval.A singular vector decomposition(SVD) statistical method was employed to retrieve SIF using radiance over a micro spectral window(~2 nm) around the Fe Fraunhofer lines(centered at 758.8 nm).The global SIF at 758.8 nm was successfully retrieved with a low residual error of 0.03 mW m^(-1) sr^(-1) nm^(-1).The results show that the spatial and temporal patterns of the retrieved SIF agree well with the global terrestrial vegetation pattern.The monthly SIF products retrieved from the TanSat data were compared with other remote sensing datasets, including OCO-2 SIF, MODIS NDVI, EVI and GPP.The overall consistency between TanSat and OCO-2 SIF products(R^2= 0.86) and the consistency of the spatial patterns and temporal variations between the TanSat SIF and MODIS vegetation indices and GPP enhance our confidence in the potential and feasibility of TanSat data for SIF retrieval.TanSat, therefore, provides a new opportunity for global sampling of SIF at fine spatial resolution(2 km × 2 km), thus improving photosynthesis observations from space. | Shanshan Du Liangyun Liu Xinjie Liu Xiao Zhang Xingying Zhang Yanmeng Bi Lianchong Zhang | 2018 | Science Bulletin2018，63，22： | 29 |
| 5 | 应用支持向量机评价土壤环境质量显示文摘基于野外采样和室内分析相结合的方法,采用电感耦合等离子体质谱法(ICP-MS)对羊草沟煤矿研究区表层土壤样品中的Cd、Cr、Zn、Pb和Cu含量进行测定,应用非线性支持向量机模型中的分类支持向量机,选用sigmoid核函数,利用MATLAB编写程序,进行土壤环境质量评价,并利用模糊综合评判法对评价结果进行验证.在此基础上,运用对应分析方法对样品和变量进行了关联分析,进一步了解重金属污染特征.评价结果表明,研究区土壤环境质量多为Ⅰ类,与模糊综合评判法的相同率达到91.67%,将支持向量机用于土壤环境质量评价是可行的.相比于传统的评价方法,支持向量机采用结构风险最小化原则,将复杂的非线性问题转化为线性问题,成功的解决了多分类、高维运算等问题. | 姜雪 卢文喜 杨青春 赵海卿 | 2014 | 中国环境科学2014，34，5： | 25 |
| 6 | 一种基于QPSO-RVM的模拟电路故障预测方法显示文摘提出了一种可应用于模拟电路故障预测的方法。通过提取被测电路的频域响应信号,计算皮尔逊相关系数,从而表征电路元件的健康度;在获取元件在不同时间点的健康度数据的基础上,推导出电路元件发生故障时的健康度阈值;将经量子粒子群算法优化的相关向量机算法用于故障预测,预测各个时间点的元件健康度变化轨迹并估计模拟电路的剩余有用寿命。该预测方法计算简单、通用性强,适用于实时预测。故障预测仿真实验与实例实验证明了方法的有效性与先进性。 | 张朝龙 何怡刚 邓芳明 袁莉芬 何威 | 2014 | 仪器仪表学报2014，35，8： | 25 |
| 7 | QSAR Studies on the Inhibitory Activityof Levofloxacin-thiadiazole HDACi Conjugates to Histone Deacetylases显示文摘A molecular electronegativity distance vector(M_t)based on 13 atomic types has been used to describe the structures of 19 conjugates(LHCc)of levofloxacin-thiadiazole HDAC inhibitor(HDACi)and related inhibitory activities(pH_i,i=1,2,6)of LHCc against histone deacetylases(HDACs,such as HDAC1,HDAC2 and HDAC6).The quantitative structure-activity relationships(QSAR)were established by using leaps-and-bounds regression analysis for the inhibitory activities(pH_i)of 19 above compounds to HDAC1,HDAC2 and HDAC6 along with M_t.The correlation coefficients(R^2)and the leave-one-out(LOO)cross validation R_(cv)^(2 )for the pH_1,pH_(2 )and pH_(6 )models were 0.976 and 0.949;0.985 and 0.977;0.976 and 0.932,respectively.The QSAR models had favorable correlations,as well as robustness and good prediction capability by R^2,F,R^2_(cv),A_(IC),F_(IT )and V_(IF )tests.Validated by using 3876 training sets,the models have good external prediction ability.The results indicate that the molecular structural units:–CH_g–(g=1,2),–NH_2,–OH,=O,–O–and–S–are the main factors which can affect the inhibitory activity of pH_1,pH_(2 )as well as pH_(6 )bioactivities of these compounds directly.Accordingly,the main interactions between HDACs inhibitor and HDACs are hydrophobic interaction,hydrogen bond,and coordination with Zn^(2+)to form compounds,which is consistent with the results in reports. | 王超 冯长君 | 2018 | Chinese Journal of Structural Chemistry2018，37，11： | 23 |
| 8 | Larvicidal and repellent potential of Moringa oleifera against malarial vector,Anopheles stephensi Liston(Insecta:Diptera:Culicidae)显示文摘Objective:To evaluate the larvicidal and pupicidal potential of the methanolic extracts from Moringa oleifera(M.oleifera) plant seeds against malarial vector Anopheles stephensi(A.stephensi) mosquitoes at different concentrations(20,40,60,80 and 100 ppm).Methods:M.oleifera was collected from the area of around Bharathiar University,Coimbatore.The dried plant materials were powdered by an electrical blender.From each sample,100 g of the plant material were extracted with 300 mL of methanol for 8 h in a Soxhlet apparatus.The extracts were evaporated to dryness in rotary vacuum evaporator to yield 122 mg and 110 mg of dark greenish material(residue) from Arcang amara and Ocimum basilicum,respectively.One gram of the each plant residue was dissolved separately in 100 mL of acetone(stock solution) from which different concentrations, i.e.,20,40,60,80 and 100 ppm were prepared.Results:Larvicidal activity of M.oleifera exhibited in the first to fourth instar larvae of the A.stephensi,and the LC_(50) and LC_(90) values were 57.79 ppm and 125.93 ppm for the first instar,63.90 ppm and 133.07 ppm for the second inslar,72.45 ppm and 139.82 ppm for the third instar,78.93 ppm and 143.20 ppm for the fourth instar,respectively. During the pupal stage the methanolic extract of M.oleifera showed that the LC_(50),and LC_(90) values were 67.77 ppm and 141.00 ppm,respectively.Conclusions:The present study indicates that the phytochemicals derived from M.oleifera seeds extracts are effective mosquito vector control agents and the plant extracts may be used for further integrated pest management programs. | Prabhu K Murugan K Nareshkumar A Ramasubramanian N Bragadeeswaran S | 2011 | Asian Pacific Journal of Tropical Biomedicine2011，1，2： | 19 |
| 9 | Machine learning methods for rockburst prediction-state-of-the-art review显示文摘One of the most serious mining disasters in underground mines is rockburst phenomena.They can lead to injuries and even fatalities as well as damage to underground openings and mining equipment.This has forced many researchers to investigate alternative methods to predict the potential for rockburst occurrence.However,due to the highly complex relation between geological,mechanical and geometric parameters of the mining environment,the traditional mechanics-based prediction methods do not always yield precise results.With the emergence of machine learning methods,a breakthrough in the prediction of rockburst occurrence has become possible in recent years.This paper presents a state-ofthe-art review of various applications of machine learning methods for the prediction of rockburst potential.First,existing rockburst prediction methods are introduced,and the limitations of such methods are highlighted.A brief overview of typical machine learning methods and their main features as predictive tools is then presented.The current applications of machine learning models in rockburst prediction are surveyed,with related mechanisms,technical details and performance analysis. | Yuanyuan Pu Derek B.Apel Victor Liu Hani Mitri | 2019 | International Journal of Mining Science and Technology2019，29，4： | 19 |
| 10 | Bifurcations of limit cycles in a Z_6-equivariant planar vector field of degree 5显示文摘A concrete numerical example of Z6-equivariant planar perturbed Hamiltonian polynomial vector fields of degree 5 having at least 24 limit cycles and the configurations of compound eyes are given by using the bifurcation theory of planar dynamical systems and the method of detection functions. There is reason to conjecture that the Hilbert number H(2k + 1) ≥ (2k + 1)2 - 1 for the perturbed Hamiltonian systems. | 李继彬 H.S.Y.Chan K.W.Chung | 2002 | Science China Mathematics2002，45，7： | 19 |
| 11 | Growth inhibition induced by short hairpin RNA to silence survivin gene in human pancreatic cancer cells显示文摘BACKGROUND:Survivin is known to be overexpressed in various human malignancies,including pancreatic cancer,and mediates cancer cell proliferation and tumor growth,so the regulation of this molecule could be a new strategy for treating pancreatic cancer.In this study,short hairpin RNAs (shRNAs) specific to survivin were introduced into human pancreatic cancer Patu8988 cells to investigate the inhibitory effects on survivin expression and cell proliferation in vitro and in vivo.METHODS:Three kinds of shRNA specific to the survivin gene were designed and cloned into eukaryotic expression plasmid pGenesil-1 vector.Subsequently the recombinant plasmids were transfected into human pancreatic cancer Patu8988 cells with lipfectamine TM 2000 reagent.The mRNA and protein expressions of survivin in the transiently transfected Patu8988 cells were determined by RT-PCR,flow cytometry,and Western blotting analysis.The proliferation inhibition rates of stably transfected Patu8988 cells were determined by MTT assay.The antitumor activities of the three kinds of survivin-shRNA plasmids were evaluated in BALB/c nude mice inoculated with Patu8988 cells and bearing human pancreatic cancer.RESULTS:The three survivin-shRNA plasmids named pGenesil1-survivin-1,pGenesil-1-survivin-2 and pGenesil-1-survivin-1+2 (with double interfering RNA sites) were successfully constructed,and were confirmed by restriction enzyme cutting and sequencing.At 48 hours after transfection,the expression of survivin mRNA and protein was inhibited in Patu8988 cells transfected with pGenesil-1-survivin-1,pGenesil-1-survivin-2,and pGenesil-1-survivin-1+2 when compared with that of either pGenesil-1-NC (with scrambled small interfering RNA) transfected cells or control cells (P<0.05).The MTT results showed that the proliferation rates of Patu8988 cells stably transfected with survivin-shRNA plasmids were reduced when compared with that of either pGenesil-1-NC transfected cells or control cells (P<0.01).Furthermore,when Patu8988 cells stably transfected with survivin-shRNA were injected into BALB/c nude mice,tumor growth was dramatically lower and the tumor was smaller than that of either pGenesil-1-NC transfected cells or control cells (P<0.01).The inhibitory effect of pGenesil1-survivin-1 was the best among the three kinds of survivinshRNA plasmids,but no combination of inhibitory effects was found in pGenesil-1-survivin-1+2.CONCLUSIONS:shRNAs specific to survivin have gene silencing effects and inhibit pancreatic cancer cell proliferation.shRNA activity against survivin could be of potential value in gene therapy for pancreatic cancer.However,shRNAs with double combining sites did not significantly enhance the interference compared with single site shRNAs,therefore further studies on this are needed. | Shen, Yong-Mei Yang, Xiao-Chun Song, Miao-Li Qin, Chen-Hao Yang, Chen Sun, Yi-Hui | 2010 | Hepatobiliary & Pancreatic Diseases International2010，9，1： | 18 |
| 12 | Peroxisome proliferator-activated receptor gamma inhibits hepatic fibrosis in rats显示文摘BACKGROUND:Hepatic fibrosis is a necessary step in the development of hepatic cirrhosis.In this study we used lentiviral vector-mediated transfection technology to evaluate the effect of peroxisome proliferator-activated receptor gamma(PPAR-γ) on rat hepatic fibrosis. METHODS:Hepatic fibrosis in rats was induced by CCl4 for 2 weeks(early fibrosis)and 8 weeks(sustained fibrosis).The rats were randomly divided into four groups:normal control, fibrosis,blank vector,and PPAR-γ.They were infected with the recombinant lentiviral expression vector carrying the rat PPAR-γgene by portal vein injection.The liver of the rats was examined histologically and hydroxyproline was assessed.In vitro primary hepatic stellate cells(HSCs)were infected with the recombinant lentiviral expression vector carrying the rat PPAR-γgene.The status of HSC proliferation was measured by the MTT assay.The protein levels of PPAR-γ,α-smooth muscle actin(α-SMA)and type I collagen expression were evaluated by the Western blotting method. RESULTS:In vitro studies revealed that expression of PPAR-γ inhibited expression ofα-SMA and type I collagen in activated HSCs(P<0.01)as well as HSC proliferation(P<0.01).In vivo experiments indicated that in the early hepatic fibrosis group,the hydroxyproline content and the level of collagen I protein in the liver in the PPAR-γtransfected group were not significantly different compared to the hepatic fibrosis group and the blank vector group;whereas the expressions of PPAR-γ andα-SMA were different compared to the hepatic fibrosis group(P<0.01).In the sustained hepatic fibrosis group,there were significant differences in the hydroxyproline content and the expression of PPAR-γ,α-SMA,and type I collagen between each group.CONCLUSION:PPAR-γcan inhibit HSC proliferation and hepatic fibrosis,and suppressα-SMA and type I collagen expression. | ZhengWang,Jia-Peng Xu,Yong-Chao Zheng,Wei Chen,Yong-Wei Sun,Zhi-YongWu and Meng Luo Department of General Surgery,Renji Hospital,Shanghai Jiaotong University School of Medicine,Shanghai 200127,China | 2011 | Hepatobiliary & Pancreatic Diseases International2011，10，1： | 18 |
| 13 | Vector超声系统对牙周炎维护期患者的疗效观察和疼痛感受评价显示文摘目的本研究应用Vector超声系统、手工刮治和常规超声系统对慢性牙周炎患者维护期的牙周袋进行治疗,以比较不同治疗方法的临床疗效和患者的疼痛程度。方法选择26例慢性牙周炎维护期的患者,其全口四个象限每个象限至少各有2颗牙齿,其邻面至少有一位点探诊深度≥4mm,有探诊出血,根据随机表将四个象限随机分入手工刮治组、传统超声治疗组(赛特力组)、Vector摩擦剂组和Vector抛光剂组进行龈下刮治。记录基线和治疗后3个月时,入选位点的菌斑指数、牙周探诊深度、临床附着丧失、出血指数及刮治当时的疼痛程度VAS值。结果对于牙周炎维护期患者,Vector摩擦剂组、Vector抛光剂组的治疗效果和手工刮治组、赛特力组相同,牙周探诊深度、临床附着丧失和出血指数在治疗后都有明显改善,同时患者在治疗中的疼痛程度明显小于常规的手工刮治和超声刮治。结论Vector超声系统为牙周炎维护期患者的复查复治提供了一个新的有效手段,有利于增加患者的依从性。 | 周爽英 曹婕 孟焕新 | 2010 | 现代口腔医学杂志2010，24，2： | 18 |
| 14 | 话说向量显示文摘英文vector的中文译名是“向量”.顾名思义,就是指“既有方向又有大小的量”.可以说译得十分贴切.不过,中国在清末引进vector概念时,物理学家称之为“矢量”,至今两种译名并存.究其原因,早年的向量,只是物理学专门用来表示力和速度等物理量的工具,并不为数学家所重视.因为物理学用得多,矢量的译名自然流行.向量进入数学领域之后,渐渐有取代“矢量”之势. | 张奠宙 袁震东 | 2007 | 数学教学2007，，9： | 16 |
| 15 | An Anthropomorphic Robot Hand Developed Based on Underactuated Mechanism and Controlled by EMG Signals显示文摘When developing a humanoid myo-control hand,not only the mechanical structure should be considered to afford a highdexterity,but also the myoelectric (electromyography,EMG) control capability should be taken into account to fully accomplishthe actuation tasks.This paper presents a novel humanoid robotic myocontrol hand (AR hand Ⅲ) which adopted an underac-tuated mechanism and a forearm myocontrol EMG method.The AR hand Ⅲ has five fingers and 15 joints,and actuated by threeembedded motors.Underactuation can be found within each finger and between the rest three fingers (the middle finger,the ringfinger and the little finger) when the hand is grasping objects.For the EMG control,two specific methods are proposed:thethree-fingered hand gesture configuration of the AR hand Ⅲ and a pattern classification method of EMG signals based on astatistical learning algorithm-Support Vector Machine (SVM).Eighteen active hand gestures of a testee are recognized ef-fectively,which can be directly mapped into the motions of AR hand Ⅲ.An on-line EMG control scheme is established basedon two different decision functions:one is for the discrimination between the idle and active modes,the other is for the recog-nition of the active modes.As a result,the AR hand Ⅲ can swiftly follow the gesture instructions of the testee with a time delayless than 100 ms. | Da-peng Yang~1 Jing-dong Zhao~1 Yi-kun Gu~1 Xin-qing Wang~1 Nan Li~1 Li Jiang~1Hong Liu~(1,2) Hai Huang~3 Da-wei Zhao~41.State Key Laboratory of Robotics and System,Harbin Institute of Technology,Harbin 150001,P.R.China2.Institute of Robotics and Mechatronics,German Aerospace Center,Munich 82230,Germany3.College of Shipbuilding Engineering,Harbin Engineering University,Harbin 150001,P.R.China4.College of Automation,Harbin Engineering University,Harbin 150001,P.R.China | 2009 | Journal of Bionic Engineering2009，6，3： | 16 |
| 16 | Common Persistence and Error-Correction Mode in Conditional Variance显示文摘We firstly define the persistence and common persistence of vector GARCH process from the point of view of the integration, and then discuss the sufficient and necessary condition of the copersistence in variance. In the end of this paper, we give the properties and the error correction model of vector GARCH process under the condition of the co-persistence. | LI Han-dong, ZHANG Shi-ying School of Management, Tianjin University, Tianjin 300072, China | 2001 | Journal of Systems Science and Systems Engineering2001，13，3： | 15 |
| 17 | 基于PCA-LSSVM的机车走行部滚动轴承故障诊断研究显示文摘机车走行部的故障诊断是保障机车安全运行的重要手段之一。鉴于目前机车走行部滚动轴承故障诊断中存在的特征提取困难、故障诊断不准确等问题,提出一种基于最小二乘支持向量机(LSSVM)的故障诊断方法。通过主成分分析方法(PCA)对机车走行部滚动轴承的故障特征进行特征提取,将提取后的特征向量输入到故障诊断模型中,结合最小二乘支持向量机原理实现机车走行部滚动轴承的故障诊断。仿真结果表明,相比其他方法而言分类准确率达到了100%,模型构建时间为3.642 s,满足机车走行部滚动轴承的诊断要求。将最小二乘支持向量机引入并应用到机车走行部故障诊断领域中,为机车走行部故障诊断系统的研究与开发提供新思路和新方法。 | 钟小凤 贺德强 苗剑 | 2014 | 广西大学学报(自然科学版)2014，39，2： | 15 |
| 18 | A reliability assessment method based on support vector machines for CNC equipment显示文摘With the applications of high technology,a catastrophic failure of CNC equipment rarely occurs at normal operation conditions.So it is difficult for traditional reliability assessment methods based on time-to-failure distributions to deduce the reliability level.This paper presents a novel reliability assessment methodology to estimate the reliability level of equipment with machining performance degradation data when only a few samples are available.The least squares support vector machines(LS-SVM) are introduced to analyze the performance degradation process on the equipment.A two-stage parameter optimization and searching method is proposed to improve the LS-SVM regression performance and a reliability assessment model based on the LS-SVM is built.A machining performance degradation experiment has been carried out on an OTM650 machine tool to validate the effectiveness of the proposed reliability assessment methodology. | WU Jun DENG Chao SHAO XinYu XIE S Q | 2009 | Science China(Technological Sciences)2009，52，7： | 14 |
| 19 | S-101电子海图可视化关键技术显示文摘S-101电子海图的可视化是新一代电子海图显示、信息系统处理和辅助船员海上导航的前提。相比于S-52标准,S-101的图示表达处理机制变动较大,现有的可视化处理方法已不再完全适用。因此,研究了S-101电子海图可视化若干关键技术,并对其进行了实验测试。测试结果表明,S-101电子海图的可视化在显示效果上与S-52并无明显差别,但基于人机可读的XML(extensible markup language)技术的图示表达处理方式更加灵活和易于控制,基于S-100的图示表达机制为多源异构数据产品和服务的可视化互操作提供了基本处理模型。 | 万晓霞 洛佳男 邬金 段晶 | 2018 | 测绘地理信息2018，43，4： | 14 |
| 20 | Real-time transient stability assessment in power system based on improved SVM显示文摘Due to the strict requirements of extremely high accuracy and fast computational speed, real-time transient stability assessment(TSA) has always been a tough problem in power system analysis.Fortunately, the development of artificial intelligence and big data technologies provide the new prospective methods to this issue, and there have been some successful trials on using intelligent method, such as support vector machine(SVM) method.However, the traditional SVM method cannot avoid false classification, and the interpretability of the results needs to be strengthened and clear.This paper proposes a new strategy to solve the shortcomings of traditional SVM,which can improve the interpretability of results, and avoid the problem of false alarms and missed alarms.In this strategy, two improved SVMs, which are called aggressive support vector machine(ASVM) and conservative support vector machine(CSVM), are proposed to improve the accuracy of the classification.And two improved SVMs can ensure the stability or instability of the power system in most cases.For the small amount of cases with undetermined stability, a new concept of grey region(GR) is built to measure the uncertainty of the results, and GR can assessment the instable probability of the power system.Cases studies on IEEE 39-bus system and realistic provincial power grid illustrate the effectiveness and practicability of the proposed strategy. | Wei HU Zongxiang LU Shuang WU Weiling ZHANG Yu DONG Rui YU Baisi LIU | 2019 | Journal of Modern Power Systems and Clean Energy2019，7，1： | 14 |
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