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Reliability Analysis in Presence of Random Variables and Fuzzy Variables 随机变量和模糊变量存在下的可靠性分析
Journal of Applied Mathematics Pub Date : 2015-03-02 DOI: 10.1155/2015/365051
Cui Lijie, L. Zhenzhou, Liu Guijie
{"title":"Reliability Analysis in Presence of Random Variables and Fuzzy Variables","authors":"Cui Lijie, L. Zhenzhou, Liu Guijie","doi":"10.1155/2015/365051","DOIUrl":"https://doi.org/10.1155/2015/365051","url":null,"abstract":"For mixed uncertainties of random variables and fuzzy variables in engineering, three indices, that is, interval reliability index, mean reliability index, and numerical reliability index, are proposed to measure safety of structure. Comparing to the reliability membership function for measuring the safety in case of mixed uncertainties, the proposed indices are more intuitive and easier to represent the safety degree of the engineering structure, and they are more suitable for the reliability design in the case of the mixed uncertainties. The differences and relations among three proposed indices are investigated, and their applicability is compared. Furthermore, a technique based on the probability density function evolution method is employed to improve the computational efficiency of the proposed indices. At last, a numerical example and two engineering examples are illustrated to demonstrate the feasibility, reasonability, and efficiency of the computational technique of the proposed indices.","PeriodicalId":49251,"journal":{"name":"Journal of Applied Mathematics","volume":"2015 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2015-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2015/365051","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64922535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Bifurcation of Safe Basins and Chaos in Nonlinear Vibroimpact Oscillator under Harmonic and Bounded Noise Excitations 谐波和有界噪声激励下非线性振动冲击振荡器安全池的分岔与混沌
Journal of Applied Mathematics Pub Date : 2014-12-21 DOI: 10.1155/2014/967395
Rong Haiwu, W. Xiang-dong, Lu Qizhi, Xu Wei, Fang Tong
{"title":"Bifurcation of Safe Basins and Chaos in Nonlinear Vibroimpact Oscillator under Harmonic and Bounded Noise Excitations","authors":"Rong Haiwu, W. Xiang-dong, Lu Qizhi, Xu Wei, Fang Tong","doi":"10.1155/2014/967395","DOIUrl":"https://doi.org/10.1155/2014/967395","url":null,"abstract":"The erosion of the safe basins and chaotic motions of a nonlinear vibroimpact oscillator under both harmonic and bounded random noise is studied. Using the Melnikov method, the system’s Melnikov integral is computed and the parametric threshold for chaotic motions is obtained. Using the Monte-Carlo and Runge-Kutta methods, the erosion of the safe basins is also discussed. The sudden change in the character of the stochastic safe basins when the bifurcation parameter of the system passes through a critical value may be defined as an alternative stochastic bifurcation. It is founded that random noise may destroy the integrity of the safe basins, bring forward the occurrence of the stochastic bifurcation, and make the parametric threshold for motions vary in a larger region, hence making the system become more unsafely and chaotic motions may occur more easily.","PeriodicalId":49251,"journal":{"name":"Journal of Applied Mathematics","volume":"2014 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2014-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2014/967395","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64770016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Optimization Method for Crop Growth Characteristics Based on Improved Locality Preserving Projection 基于改进局部保持投影的作物生长特性优化方法
Journal of Applied Mathematics Pub Date : 2014-11-05 DOI: 10.1155/2014/809597
Jia Dongyao, Hu Po, Zou Shengxiong
{"title":"Optimization Method for Crop Growth Characteristics Based on Improved Locality Preserving Projection","authors":"Jia Dongyao, Hu Po, Zou Shengxiong","doi":"10.1155/2014/809597","DOIUrl":"https://doi.org/10.1155/2014/809597","url":null,"abstract":"Locality preserving projection (LPP) retains only partial information, and category information of samples is not considered, which causes misclassification of feature extraction. An improved locality preserving projection algorithm is proposed to optimize the extraction of growth characteristics. Firstly, preliminary dimensionality reduction of sample data is constructed by using two-dimensional principal component analysis (2DPCA) to retain the spatial information. Then, two optimized subgraphs are defined to describe the neighborhood relation between different categories of data. Finally, feature parameters set are obtained to extract local information of samples by improved LPP algorithm. The experiments show that the improved LPP algorithm has good adaptability, and the highest SVM classification accuracy rate of this method can reach more than 96%. Compared with other methods, the improved LPP has superior optimized performance in terms of multidimensional data analysis and optimization.","PeriodicalId":49251,"journal":{"name":"Journal of Applied Mathematics","volume":"2014 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2014-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2014/809597","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64683890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optimal Acceleration-Velocity-Bounded Trajectory Planning in Dynamic Crowd Simulation 动态人群仿真中最优加速度-速度有界轨迹规划
Journal of Applied Mathematics Pub Date : 2014-08-31 DOI: 10.1155/2014/501689
Yue-wen Fu, Li Meng, Jia-hong Liang, Xiao-qian Hu
{"title":"Optimal Acceleration-Velocity-Bounded Trajectory Planning in Dynamic Crowd Simulation","authors":"Yue-wen Fu, Li Meng, Jia-hong Liang, Xiao-qian Hu","doi":"10.1155/2014/501689","DOIUrl":"https://doi.org/10.1155/2014/501689","url":null,"abstract":"Creating complex and realistic crowd behaviors, such as pedestrian navigation behavior with dynamic obstacles, is a difficult and time consuming task. In this paper, we study one special type of crowd which is composed of urgent individuals, normal individuals, and normal groups. We use three steps to construct the crowd simulation in dynamic environment. The first one is that the urgent individuals move forward along a given path around dynamic obstacles and other crowd members. An optimal acceleration-velocity-bounded trajectory planning method is utilized to model their behaviors, which ensures that the durations of the generated trajectories are minimal and the urgent individuals are collision-free with dynamic obstacles (e.g., dynamic vehicles). In the second step, a pushing model is adopted to simulate the interactions between urgent members and normal ones, which ensures that the computational cost of the optimal trajectory planning is acceptable. The third step is obligated to imitate the interactions among normal members using collision avoidance behavior and flocking behavior. Various simulation results demonstrate that these three steps give realistic crowd phenomenon just like the real world.","PeriodicalId":49251,"journal":{"name":"Journal of Applied Mathematics","volume":"2014 1","pages":"1-12"},"PeriodicalIF":0.0,"publicationDate":"2014-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2014/501689","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64521427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Reduction of Multidimensional Image Characteristics Based on Improved KICA 基于改进KICA的多维图像特征约简
Journal of Applied Mathematics Pub Date : 2014-08-17 DOI: 10.1155/2014/256206
Jia Dongyao, Ai Yanke, Zou Shengxiong
{"title":"Reduction of Multidimensional Image Characteristics Based on Improved KICA","authors":"Jia Dongyao, Ai Yanke, Zou Shengxiong","doi":"10.1155/2014/256206","DOIUrl":"https://doi.org/10.1155/2014/256206","url":null,"abstract":"The domestic and overseas studies of redundant multifeatures and noise in dimension reduction are insufficient, and the efficiency and accuracy are low. Dimensionality reduction and optimization of characteristic parameter model based on improved kernel independent component analysis are proposed in this paper; the independent primitives are obtained by KICA (kernel independent component analysis) algorithm to construct an independent group subspace, while using 2DPCA (2D principal component analysis) algorithm to complete the second order related to data and further reduce the dimension in the above method. Meanwhile, the optimization effect evaluation method based on Amari error and average correlation degree is presented in this paper. Comparative simulation experiments show that the Amari error is less than 6%, the average correlation degree is stable at 97% or more, and the parameter optimization method can effectively reduce the dimension of multidimensional characteristic parameters.","PeriodicalId":49251,"journal":{"name":"Journal of Applied Mathematics","volume":"2014 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2014-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2014/256206","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64410849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Hopf Bifurcation Analysis in a New Chaotic System with Chaos Entanglement Function 一类具有混沌纠缠函数的新型混沌系统的Hopf分岔分析
Journal of Applied Mathematics Pub Date : 2014-07-22 DOI: 10.1155/2014/371509
Zhang Jiangang, Chu Yandong, Duan Wenju, Chang Yingxiang, An Xinlei
{"title":"Hopf Bifurcation Analysis in a New Chaotic System with Chaos Entanglement Function","authors":"Zhang Jiangang, Chu Yandong, Duan Wenju, Chang Yingxiang, An Xinlei","doi":"10.1155/2014/371509","DOIUrl":"https://doi.org/10.1155/2014/371509","url":null,"abstract":"A new approach to generate chaotic phenomenon, called chaos entanglement, is introduced in this paper. The basic principle is to entangle two or multiple stable linear subsystems by entanglement functions to form an artificial chaotic system such that each of them evolves in a chaotic manner. The Hopf bifurcation of a new chaotic system with chaos entanglement function is studied. More precisely, we study the stability and bifurcations of equilibrium in the new chaotic system. Besides, we controlled the system to any fixed point to eliminate the chaotic vibration by means of sliding mode method. And the numerical simulations were presented to confirm the effectiveness of the controller.","PeriodicalId":49251,"journal":{"name":"Journal of Applied Mathematics","volume":"2014 1","pages":"1-13"},"PeriodicalIF":0.0,"publicationDate":"2014-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2014/371509","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64466325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Adaptive Combination Forecasting Model Based on Area Correlation Degree with Application to China’s Energy Consumption 基于区域关联度的自适应组合预测模型及其在中国能源消费中的应用
Journal of Applied Mathematics Pub Date : 2014-07-21 DOI: 10.1155/2014/845807
Zhou Cheng, Chen Xi-yang
{"title":"Adaptive Combination Forecasting Model Based on Area Correlation Degree with Application to China’s Energy Consumption","authors":"Zhou Cheng, Chen Xi-yang","doi":"10.1155/2014/845807","DOIUrl":"https://doi.org/10.1155/2014/845807","url":null,"abstract":"To accurately forecast energy consumption plays a vital part in rational energy planning formulation for a country. This study applies individual models (BP, GM (1, 1), triple exponential smoothing model, and polynomial trend extrapolation model) and combination forecasting models to predict China’s energy consumption. Since area correlation degree (ACD) can comprehensively evaluate both the correlation and fitting error of forecasting model, it is more effective to evaluate the performance of forecasting model. Firstly, the forecasting model’s performances rank in line with ACD. Then ACD is firstly proposed to choose individual models for combination and determine combination weight in this paper. Forecast results show that combination models usually have more accurate forecasting performance than individual models. The new method based on ACD shows its superiority in determining combination weights, compared with some other combination weight assignment methods such as: entropy weight method, reciprocal of mean absolute percentage error weight method, and optimal method of absolute percentage error minimization. By using combination forecasting model based on ACD, China’s energy consumption will be up to 5.7988 billion tons of standard coal in 2018.","PeriodicalId":49251,"journal":{"name":"Journal of Applied Mathematics","volume":"2014 1","pages":"1-12"},"PeriodicalIF":0.0,"publicationDate":"2014-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2014/845807","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64706386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Estimating Target Heights Based on the Earth Curvature Model and Micromultipath Effect in Skywave OTH Radar 基于地球曲率模型和天波OTH雷达微多径效应的目标高度估计
Journal of Applied Mathematics Pub Date : 2014-07-14 DOI: 10.1155/2014/424191
Hou Chengyu, W. Yuxin, Chen Jiawei
{"title":"Estimating Target Heights Based on the Earth Curvature Model and Micromultipath Effect in Skywave OTH Radar","authors":"Hou Chengyu, W. Yuxin, Chen Jiawei","doi":"10.1155/2014/424191","DOIUrl":"https://doi.org/10.1155/2014/424191","url":null,"abstract":"Skywave over-the-horizon (OTH) radar systems have important long-range strategic warning values. They exploit skywave propagation reflection of high frequency signals from the ionosphere, which provides the ultra-long-range surveillance capabilities to detect and track maneuvering targets. Current OTH radar systems are capable of localizing targets in range and azimuth but are unable to achieve reliable instantaneous altitude estimation. Most existing height measurement methods of skywave OTH radar systems have taken advantage of the micromultipath effect and been considered in the flat earth model. However, the flat earth model is not proper since large error is inevitable, when the detection range is over one thousand kilometers. In order to avoid the error caused by the flat earth model, in this paper, an earth curvature model is introduced into OTH radar altimetry methods. The simulation results show that application of the earth curvature model can effectively reduce the estimation error.","PeriodicalId":49251,"journal":{"name":"Journal of Applied Mathematics","volume":"2014 1","pages":"1-14"},"PeriodicalIF":0.0,"publicationDate":"2014-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2014/424191","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64488913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
A Method to Determine Oscillation Emergence Bifurcation in Time-Delayed LTI System with Single Lag 单滞后时滞LTI系统振荡出现分岔的一种确定方法
Journal of Applied Mathematics Pub Date : 2014-07-03 DOI: 10.1155/2014/823937
Yu Xiaodan, Jia Hongjie, Wang Chengshan, Jiang Yilang
{"title":"A Method to Determine Oscillation Emergence Bifurcation in Time-Delayed LTI System with Single Lag","authors":"Yu Xiaodan, Jia Hongjie, Wang Chengshan, Jiang Yilang","doi":"10.1155/2014/823937","DOIUrl":"https://doi.org/10.1155/2014/823937","url":null,"abstract":"One type of bifurcation named oscillation emergence bifurcation (OEB) found in time-delayed linear time invariant (abbr. LTI) systems is fully studied. The definition of OEB is initially put forward according to the eigenvalue variation. It is revealed that a real eigenvalue splits into a pair of conjugated complex eigenvalues when an OEB occurs, which means the number of the system eigenvalues will increase by one and a new oscillation mode will emerge. Next, a method to determine OEB bifurcation in the time-delayed LTI system with single lag is developed based on Lambert W function. A one-dimensional (1-dim) time-delayed system is firstly employed to explain the mechanism of OEB bifurcation. Then, methods to determine the OEB bifurcation in 1-dim, 2-dim, and high-dimension time-delayed LTI systems are derived. Finally, simulation results validate the correctness and effectiveness of the presented method. Since OEB bifurcation occurs with a new oscillation mode emerging, work of this paper is useful to explore the complex phenomena and the stability of time-delayed dynamic systems.","PeriodicalId":49251,"journal":{"name":"Journal of Applied Mathematics","volume":"2014 1","pages":"1-12"},"PeriodicalIF":0.0,"publicationDate":"2014-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2014/823937","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64693566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Unsupervised Texture Segmentation Using Active Contour Model and Oscillating Information 基于主动轮廓模型和振荡信息的无监督纹理分割
Journal of Applied Mathematics Pub Date : 2014-06-26 DOI: 10.1155/2014/614613
Guodong Wang, Zhenkuan Pan, Qian Dong, Ximei Zhao, Zhimei Zhang, J. Duan
{"title":"Unsupervised Texture Segmentation Using Active Contour Model and Oscillating Information","authors":"Guodong Wang, Zhenkuan Pan, Qian Dong, Ximei Zhao, Zhimei Zhang, J. Duan","doi":"10.1155/2014/614613","DOIUrl":"https://doi.org/10.1155/2014/614613","url":null,"abstract":"Textures often occur in real-world images and may cause considerable difficulties in image segmentation. In order to segment texture images, we propose a new segmentation model that combines image decomposition model and active contour model. The former model is capable of decomposing structural and oscillating components separately from texture image, and the latter model can be used to provide smooth segmentation contour. In detail, we just replace the data term of piecewise constant/smooth approximation in CCV (convex Chan-Vese) model with that of image decomposition model-VO (Vese-Osher). Therefore, our proposed model can estimate both structural and oscillating components of texture images as well as segment textures simultaneously. In addition, we design fast Split-Bregman algorithm for our proposed model. Finally, the performance of our method is demonstrated by segmenting some synthetic and real texture images.","PeriodicalId":49251,"journal":{"name":"Journal of Applied Mathematics","volume":"2014 1","pages":"614613:1-614613:11"},"PeriodicalIF":0.0,"publicationDate":"2014-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2014/614613","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64576835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
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