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2017年第5期

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一种基于高斯无向图的e-Learner情感调节模型
秦继伟1,2,吐尔根·依布拉音2*,张辉国3
(1. 新疆大学网络与技术中心,新疆乌鲁木齐 8300462. 新疆多语种信息技术实验室,新疆乌鲁木齐 8300463. 新疆大学数学与系统科学学院,新疆乌鲁木齐 830046)
摘要:e-Learning中学习者情感缺失问题为应用背景,针对目前已有情感调节模型中变量单一,对实际e-Learning环境中影响学习者情感变化的变量复杂、数据稀疏等适应能力支持不足的问题,提出基于高斯无向图的e-Learner情感调节模型,强调综合考虑影响学习者情感调节的多种属性,建立e-Learner的情感调节模型。在获取e-Learner实时学习日志的基础上,对影响e-Learner情感的主要因素,进行相关性分析、统计,利用高斯无向图模型拟合数据,理解数据变量间的相互关系,运用Chow-Liu 算法搜索最小BIC森林,得到e-Learner情感调节模型,为确定e-Learner情感调节的资源提供依据。
关键词:情感;情感调节;e-Learner;高斯无向图
中图分类号:TP391 ??????文献标识码:A?????? 文章编号:1004-731X (2017) 05-0935-07
DOI: 10.16182/j.issn1004731x.joss.201705001
E-Learner’s Emotion Regulation Model with Undirected Gaussian Graphical Model
Qin Jiwei1,2, Turgun·Ibragim2*, Zhang Huiguo3
(1. Center of Network and Information Technology, Xinjiang University, Urumqi 830046, China;2. Xinjiang Laboratory of Multi-Language Infornation Technology, Xinjiang University, Urumqi 830046, China;3. College of Mathematics and System Sciences, Xinjiang University, Urumqi 830046, China)
Abstract: Based on the absence of emotion in the background, e-Learner’s emotion regulation model with simple variable can’t fit the sparse and complex data in e-Learning, an e-Learner’s emotion regulation model was proposed by Undirected Gaussian Graphical Model, which emphasized on many kinds of factor influences in emotion regulation. Correlation analysis, statistics, Gaussian undirected graph model fit the data to understand the relationship between data variables by using Chow-Liu algorithm, which searched for the smallest BIC forests and built e-learner’s emotion regulation model based on the e-Learner’s log. This model gives a basis for emotion regulation in e-Learning.
Keywords: emotion; emotion regulation; e-Learner; Undirected Gaussian Graphical Model
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郭业才1,2,蔡力坚1,赵卫娟1,张秀再1
(1. 南京信息工程大学电子与信息工程学院,南京 210044;2. 江苏省大气环境与装备技术协同创新中心,南京 210044)
摘要:为准确反映雾霾天气对卫星信道统计特性的影响,将雾霾天气划分为雾状态、雾霾混合状态和霾状态,分别用Rice模型、Corazza模型和Suzuki模型进行描述;根据雾霾天气状态间的转换关系,建立了雾霾天气下卫星信道三状态Markov模型;以定义的联合电平通过率、平均衰落持继时间及联合电平通过率的相对误差为性能指标进行了仿真验证。仿真结果表明,与雾霾天气下卫星信道单状态和两状态模型相比,卫星信道三状态Markov模型能更好地描述卫星信号的衰落特性,更加贴近实际。
关键词:雾霾天气;卫星信道;Markov模型;统计特性参量
中图分类号:TN927.23?? ????文献标识码:A?????? 文章编号:1004-731X (2017) 05-0941-09
DOI: 10.16182/j.issn1004731x.joss.201705002
Research and Simulation of Satellite Channel Three-State Markov Model under Fog-and-Haze Weather
Guo Yecai1,2, Cai Lijian1, Zhao Weijuan1, Zhang Xiuzai1
(1. College of Electronic and Information Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China;2. Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology (CICAEET), Nanjing 210044, China)
Abstract: To accurately reflect the influence on the statistical characteristics of satellite channel under the fog-and-haze weather, the fog-and-haze weather was divided into the fog state, mixed state, and haze state, respectively, and their statistical characteristics were described by Rice model, Corazza model, and Suzuki model. Based on analyzing the conversion relation between fog-and-haze weather states, the satellite channel three-state Markov model was proposed. The defined joint level pass rate, the average fading duration and its relative error were used as the performance index of the satellite channel model, and the simulation tests were carried out. The simulation results show that compared with the single state and two-state model of the satellite channel in the fog-and-haze weather, the proposed model can describe the fading characteristics of the satellite signals better, and is more close to the actual.
Keywords: fog-and-haze weather; satellite channel; Markov model; statistical characteristics parameters
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绳系拖挂车辆的动力学仿真
陈宁,马洪超
(南京林业大学机械电子工程学院,南京 210037)
摘要:绳系拖挂车辆是指由非专业拖车用绳子牵引一辆故障车。这种拖挂方式操纵稳定性差,前后车连接刚性差,轨迹跟随性差,易引起交通事故。为了研究绳系拖挂车辆系统的操纵稳定性,选择Dugoff非线性轮胎模型,考虑牵引车的纵向、侧向和横摆运动,建立了七自由度车辆动力学模型及绳系拖挂系统模型。基于Matlab/Simulink分析了牵引绳长度对整个车辆系统的影响,针对绳系拖挂车辆系统,提出了挂车前轮自动转向的反馈控制策略,以提高稳定性和轨迹跟随性仿真结果显示:所提出的挂车前轮转向反馈控制不仅提高了绳系拖挂车辆的稳定性,也改善了挂车的轨迹跟随性。
关键词:非线性车辆模型;绳系拖挂车辆模型;反馈控制;仿真
中图分类号:U463.42????? 文献标识码:A?????? 文章编号:1004-731X (2017) 05-0950-08
DOI: 10.16182/j.issn1004731x.joss.201705003
Dynamic Simulation for Tethered Trailer Vehicle
Chen Ning, Ma Hongchao
(College of Mechanical and Electronic Engineering, Nanjing Forestry University, Nanjing 210037, China)
Abstract: Tethered trailer vehicle is a non professional tractor that drags an unpowered vehicle with hemp rope. This conduct has many problems: poor operating stability, and high incidence of traffic accident. A nonlinear dynamic model for longitudinal, lateral, and yaw motions was developed. The model considers nonlinearity through a modified Dugoff's tire friction model, and is seven-degree-of-freedom. A new nonlinear tethered tractor-trailer combination model was created to simulate critical parameters which would cause unstable state. Then, a trailer front-wheel steering feedback control strategy was derived with the goal of improving stability and trajectory tracking feature of the tractor-trailer system. The comparison of the simulation results for tension of the hemp rope, trajectory feature, and handling stability clearly demonstrates the efficacy of feedback control for the tethered tractor-trailer combination.
Key words: nonlinear vehicle model; rope-dragged tractor model; feedback control; simulation
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基于MATLABADAMS的肌电假手联合仿真
尤波1,陶守通1,黄玲1,李勃君1,赵汗青2
(1. 哈尔滨理工大学自动化学院,黑龙江 哈尔滨 150080;2. 哈尔滨理工大学测通学院,黑龙江 哈尔滨 150080)
摘要:为了减少假手研制过程中投入的大量成本和费用,充分利用虚拟技术,搭建假手的仿真系统。采用Pro/E虚拟建模软件,搭建具有多自由度的假手样机模型;将其导入到ADAMS中,对假手进行运动学仿真,验证其合理性通过ADAMSMATLAB的接口模块ADAMS/Control,利用MATLAB/Simulink模块搭建假手模型的控制系统,将对应的手部动作模式信息转化为假手关节期望角度将肌电信号采集系统采集的信号,采用基于绝对值均值的阈值决策法进行处理,提取肌电信号的时域特征,送入MATLAB,进行联合仿真。研究结果表明,基于MATLABADAMS的肌电假手的仿真系统实现了对肌电假手的驱动,验证了肌电假手控制方案的可行性。
关键词:假手;表面肌电信号;联合仿真;MATLABADAMS
中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2017) 05-0957-08
DOI: 10.16182/j.issn1004731x.joss.201705004
Coordinated Simulation of EMG Prosthetic Hand Based on MATLAB and ADAMS
You Bo1, Tao Shoutong1, Huang Ling1, Li Bojun1, Zhao Hanqing2
(1. College of Automation, Harbin University of Science and Technology, Harbin 150080, China; 2. College of Measure-Control Technology and Communication Engineering, Harbin University of Science and Technology, Harbin 150080, China)
Abstract: In order to reduce the costs and expense during prosthetic hand research process, a simulation system of prosthetic hand was built by using the virtual technology. Building the multi-DOF prototype model of prosthetic hand with virtual modeling software Pro/E, the model was imported into software ADAMS to verifying the feasibility of prosthetic hand kinematic simulation. Through the interface modular part (ADAMS /control) of MATLAB and ADAMS, using Simulink module of MATLAB software built the prosthetic hand model control system of EMG (electromyography), changing the model information of the corresponding hand movements into actual expected angel of prosthetic hand joints. The signal, which was collected by the EMG signal acquisition system, was handled based on the threshold decision of the mean absolute value, then extracted time domain feature of EMG signal and sent it into MATLAB, beginning coordinated simulation. The research results show that the drive of EMG prosthetic hand is successfully implemented by simulation system of EMG prosthetic hand based on MATLAB and ADAMS. The feasibility of EMG prosthetic controlling scheme hand has been verified by using the real-time coordinated simulation.
Keywords: prosthetic hand; sEMG; coordinated simulation; MATLAB; ADAMS
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三维GIS中矢量数据的高效精确渲染方法
李尚林,胡夏,刘晓平
(合肥工业大学计算机与信息学院,合肥 230009)
摘要:在地理信息系统(GIS, Geographic Information System)中,矢量数据在空间位置定位和空间分析等方面有着许多重要的应用,精确高效的将二维矢量数据叠加绘制到三维地形上是必需的。提出了一种动态矢量纹理金字塔叠加绘制方法。根据当前视点位置实时生成对应金字塔级别的矢量纹理块,矢量纹理分块与地形分块一一对应,统一调度渲染,并使用无约束各向异性滤波的纹理反走样方法来减轻纹理走样问题。该方法独立于底层地形几何体,因此能够跟大部分多分辨率地形绘制方法很好的进行结合。在数字地球系统中使用多层矢量数据的实验结果表明,所提算法绘制效率较高,绘制效果良好。
关键词:三维GIS;矢量数据;动态纹理金字塔;无约束各项异性滤波
中图分类号:TP391????? 文献标识码:A?????? 文章编号:1004-731X (2017) 05-0965-08
DOI: 10.16182/j.issn1004731x.joss.201705005
Precisely and Efficiently Vector Data Rendering Method in 3D GIS
Li Shanglin, Hu Xia, Liu Xiaoping
(Department of Computer Science and Information, Hefei University of Technology, Hefei 230009, China)
Abstract: In the geographic information system (GIS), vector data has many important applications in such aspects as orientation space location and spatial analysis. It is essential to make 2D vector data overlay mapping to the 3d terrain accurately and efficiently in 3D GIS. A method based on dynamic vector texture pyramid was proposed to render vector data. The real-time generated vector texture block corresponding with the level of the pyramid according to the current view position. Vector data texture block and terrain block are one-to-one correspondence, then they are unified rendering. Unconstrained anisotropic texture filtering methods was used to reduce the texture aliasing problem. Because this method is independent of the underlying terrain geometry, so that it can combine with most multi-resolution terrain rendering methods. Experiments using multi-vector data in the digital earth system show?the presented method has higher efficiency and better rendering effect.
Keywords: 3D GIS; vector data; dynamic texture pyramid; unconstrained anisotropic texture
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机场助航灯光强动态检测等光强图的绘制
贾立山1,2,王立文2
(1. 中国民航大学电子信息与自动化学院,天津 300300;2. 中国民航大学航空地面特种设备民航研究基地,天津 300300)
摘要:针对机场助航灯光强动态检测技术中等光强图的绘制,提出了应用规则矩形网格法进行机场助航灯光等光强图绘制的方法。该方法根据机场助航灯光强动态检测工作原理处理检测数据,采用虚拟网格系统与绘图区域网格系统相结合的方法,在虚拟网格系统中自动搜索等光强曲线的变化轨迹,映射到绘图区域网格系统进行填充生成等光强图。编写了等光强图绘制程序,进行了仿真实验。仿真实验表明,该方法能够正确生成等光强图,而且需要数据量少,绘制速度快,能够满足机场助航灯光强动态检测的要求。
关键词:机场助航灯光强动态检测;规则矩形网格法;等光强图;等值线
中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2017) 05-0973-06
DOI: 10.16182/j.issn1004731x.joss.201705006
Drawing of Isocandela Diagram in Dynamic Detection of Light Intensity of Airport Flight Aid Light
Jia Lishan1,2, Wang Liwen2
(1. College of Electronic Information and Automation, Civil Aviation University of China, Tianjin 300300, China;NRfag8879环亚手机|首页主页
2. Ground Support Equipments Research Base of Civil University of China, Tianjin 300300, China)
Abstract:To the drawing of isocandela diagram in dynamic detection of light intensity of airport flight aid light, the method of using Regular Rectangle Grid Algorithm was promoted. According to the theory of dynamic detection of light intensity of airport flight aid light, detection data was handled. The method combined virtual grid system with drawing area grid system. Changing trajectory of isocandela curves were searched in the virtual grid system. After searching, they were mapped onto the drawing area grid system and filled, and the isocandela diagram was generated eventually. Drawing program of isocandela diagram was written, simulation experiments were taken. Simulation experiments show, the method can generate correct isocandela diagram. And the data needed by the method is few, drawing speed of the method is fast. The method can fulfill the need of dynamic detection of light intensity of airport flight aid light.
Keywords: dynamic detection of light intensity of airport flight aid light; regular rectangle grid algorithm; isocandela diagram; contour line
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基于Multi-Agent的手术等待时间时空模式建模与仿真
陶丽,骆亮,张自力,赖红,肖富元
(西南大学计算机与信息科学学院,重庆 400715)
摘要:为刻画病人就医等待时间的时空规律,以心脏病手术为例,基于多Agent建模技术,搭建心脏病手术服务系统MA-CSS(Multi-Agent Cardiac Surgery Service)模型。该模型重点关注病人就医距离、医疗资源丰富程度、医院和病人个体行为等多种因素对等待时间动态性的交互影响。基于MA-CSS模型的仿真实验较好地复现真实心脏病手术等待时间的时空规律,同时揭示病人择医行为、医院服务能力调整行为和等待时间之间的交互是自组织形成等待时间时空模式的可能原因。
关键词:医疗服务系统;心脏病手术;等待时间;时空模式;Multi-Agent建模
中图分类号:TP391.9 ??????文献标识码:A?????? 文章编号:1004-731X (2017) 05-0979-09
DOI: 10.16182/j.issn1004731x.joss.201705007
Multi-Agent Based Modelling and Simulation for Understanding Tempo-Spatial Patterns of Surgery Wait Times
Tao Li, Luo Liang, Zhang Zili, Lai Hong, Xiao Fuyuan
(Department of Computer and Information Science, Southwest University, Chongqing 400715, China)
Abstract:In order to characterize the self-organized tempo-spatial patterns of wait times in a healthcare service system, a multi-agent cardiac surgery service model (MA-CSS model) was proposed based on the multi-agent modeling within the context of cardiac surgery services. This model pays a special attention to how patients’ and hospitals’ behaviors and interactions affect the dynamics and relevant patterns of wait times with respect to some key factors, such as geographic accessibility to services, hospital resourcefulness, and wait times. By experimenting with the MA-CSS model, it was observed that certain regularities in wait times emerged from the simulation, which were similar to those discovered from the real world. It reveals the patients’ hospital-selection behaviors, hospitals’ service-adjustment behaviors, and their interactions via wait times may account for the self-organized tempo-spatial patterns of wait times in cardiac surgery services.
Keywords: healthcare service systems; cardiac surgery; wait times; tempo-spatial patterns; multi-agent modeling
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基于ADAMS的人体下肢运动分析及仿真
张燕,张浩淼,宣博凯,张永昌
(1.河北工业大学控制科学与工程学院,天津 300130;2.河北省控制工程技术研究中心,天津 300130)
摘要:在对人体下肢运动进行运动学和动力学分析的基础上,建立基于人体运动特点的下肢运动仿真系统。在动力学仿真软件ADAMS(Automatic dynamic Analysis of Mechanical System)中建立人体模型,并利用运动学分析得到的各个关节的角度信号和动力学分析得到的各个关节的力矩信号,对不同路况下的人体下肢运动进行仿真实验,以验证模型的准确性。实验显示,每种路况下的行走过程均平稳、正常,表明所建立的虚拟模型能够准确地描述人体下肢的运动过程,可以进行人体下肢运动学、动力学以及控制方法的研究,为主动式假肢和人体下肢康复辅具的研究提供借鉴作用。
关键词:ADAMS(Automatic dynamic Analysis of Mechanical System);下肢;动力学;运动学;仿真
中图分类号:TP24???????? 文献标识码:A???????? 文章编号:1004-731X (2017) 05-0988-09
DOI: 10.16182/j.issn1004731x.joss.201705008
Motion Analysis and Simulation of Lower Limb based on ADAMS
Zhang Yan, Zhang Haomiao, Xuan Bokai, Zhang Yongchang
(1. School of Science and Engineering of Hebei University of Technology, Tianjin 300130, China; 2. Control Engineering Research Center of Hebei, Tianjin 300130, China)
Abstract: On the basis of the lower limb movement kinematics and dynamics analysis, a lower limb motion simulation system was established by the virtual prototyping technology. The human model was designed by ADAMS and the angle and moment of force in each joint were obtained through kinematics and dynamics analysis. The established model of lower limb was validated by the simulation of human lower limb movement under different road conditions. The experiment result shows that the walking process of each road conditions are stable and normal. It indicates that the virtual prototype model can accurately describe the process of human limb movement. The system can be used for the research on kinematics, dynamics and control method of lower limb, which has paved way for further investigation on the control of active transfemoral prosthesis and lower limb rehabilitation technical aids.
Keywords: ADAMS; lower limb; dynamics; kinematics; simulation
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基于排队论的单车道出租车上客系统建模与仿真
孙健1,2,丁日佳1,陈艳艳3
(1. 中国矿业大学(北京),北京 100083;2. 北京工业大学实验学院,北京 101101;3. 北京工业大学交通工程北京市重点实验室,北京 100124)
摘要:对单车道离港出租车上客系统通行能力的影响因素进行了仿真研究,将车辆放行控制员和乘客放行控制员的行为规则定义为逻辑开关对象,基于GPSS语言实现了车辆产生、车辆允许驶入、乘客上车、车辆驶出等过程的业务逻辑,并基于录像资料对上述过程所耗费的时间进行了统计和拟合分析,然后基于仿真模型进行了多轮仿真实验。得出以下两条结论:1.泊位数量增加与通行能力增长之间的定量关系;2. 配备服务人员帮助携带大件行李的旅客上车,通行能力可提高15%左右。
关键词:通行能力;上客区规模;Monte Carlo仿真;出租车离港排队
中图分类号:C93;TP308????? 文献标识码:A?????? 文章编号:1004-731X (2017) 05-0996-09
DOI: 10.16182/j.issn1004731x.joss.201705009
Modeling and Simulation of Single Lane Taxi Boarding System Based on Queuing Theory
Sun Jian1,2, Ding Rijia1, Chen Yanyan3
(1. Management Institute China University of Mining and Technology(Beijing), Beijing 100083, China; 2. Experimental Institute Beijing University of Technology, Beijing 101101, China; 3. Beijing Key Laboratory of Traffic Engineering Beijing University of Technology, Beijing 100124, China)
Abstract: Taxi pick-up area was described as a queuing system based on the GPSS language to establish a simulation model, to find out a new way to improve taxi traffic capacity. Vehicle release officer and passenger release officer were represented by logic switch object, such business logic as taxi producing, taxi entering, boarding, taxi leaving could be reappeared well in computer. The time which spent on the above processes were analysed and by video data. Multi wheel simulation experiments were carried out. Quantitative analysis was executed to find out how the traffic capacity are affected by the berth quantity and the fluctuation of boarding time. Two conclusions were drawn through simulation experiments1. Quantitative relation between berth quantity and system capacity. 2. Equipped with waiters to help carry bulky luggage passengers could improve traffic capacity 15%.
Keywords: traffic capacity; scale of boarding zone; Monte Carlo simulation; taxi departure queue
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啁啾信号在水下违规抛泥监测系统中的应用
钟张婷1,袁飞1,汪佳乐2,程恩1
(1.水声通信与海洋信息技术教育部重点实验室(厦门大学),厦门 361005;2.厦门港口管理局安全监督与科技信息化处,厦门 361005)
摘要:为找到一种高效便捷的方法判断疏浚船舶是否存在违规抛泥行为,研究了基于啁啾信号探测抛泥行为的方法。设计了3种实现方案:分段FFT(Fast Fourier Transformation)快速相关FRFT (Fractional Fourier Transform)变换、去斜脉冲压缩。结合五缘湾实验及仿真结果验证了3种方案的可行性,同时发现:FRFT变换抗多径和抗噪性能最佳,而去斜脉冲压缩算法效果最差。通过分析:当多径影响较为严重时,建议使用FRFT算法进行检测;当多径影响较小而对数据实时性处理要求较高的时,建议使用分段FFT快速相关算法进行检测
关键词:线性调频信号;分段FFT快速相关;FRFT变换;去斜脉冲压缩;抛沙检测
中图分类号:TP391????? 文献标识码:A?????? 文章编号:1004-731X (2017) 05-1005-09
DOI: 10.16182/j.issn1004731x.joss.201705010
Application of Chirp Signal in Underwater Acoustic Supervision System for Illegal Throwing Sand Behavior Detection
Zhong Zhangting1, Yuan Fei1, Wang Jiale2, Cheng En1
(1.Key Laboratory of Underwater Acoustic Communication and Marine Information Technology, Ministry of Education, School of Information Science and Technology, Xiamen University, Xiamen 361005, China; 2.Security Management & Technological Innovation and Information Department, Xiamen Port Authority, Xiamen 361005, China)
Abstract: To find an efficient and convenient method to determine whether a dredging is illegal is a very meaningful research content. A method of detection of throwing sand behavior based on Chirp signal was studied and three implementation schemes (subsection FFT fast correlation), FRFT and DeChirp were designed. The feasibility of the three schemes was verified by Wu Yuan Bay experiment and the simulation results. Anti-multipath and anti-noise performance of FRFT transform is the best. The performance of dechirp is the worst. Through the analysis, it comes out the conclusion: when the multipath effect is serious, FRFT algorithm for detection is recommended; When the multipath effect is small and the requirement of the data real-time processing is strict, subsection FFT fast correlation algorithms for detection is recommended.
Keywords: chirp signal; subsection FFT fast correlation; FRFT transform; dechirp pulse compression processing method; detection of throwing sand
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Improved SVDD for Speech Recognition and Simulation
Hao Rui1, Liu Xiaofeng2, Niu Yanbo2, Xiu Lei1
(1. College of Information Management, Shanxi University of Finance & Economics, Taiyuan 030006, China; 2. Taiyuan University of Technology, Taiyuan 030024, China)
Abstract: Support vector data description (SVDD) defines multi-class data by their respective hyper-spheres. The computational complexity of the quadratic programming problem is reduced significantly and it is easier to solve multi-class classification problems. Thus, SVDD has attracted more and more attention in the field of speech recognition research. For the problems of the feature vectors of speech samples overlapping and updating, the conventional SVDD for multi-class classification was improved. On the one hand, the spatial position of the samples was fully used to construct the decision function in overlapping domain of hyper-spheres; On the other hand, based on class incremental learning the dynamic change of support vectors was implemented. Simulation experimental results indicate that the proposed method reduces modeling time obviously and has better recognition performance.
Keywords: support vector data description; multi-class classification; decision function; incremental learning; speech recognition system simulation
面向语音识别的SVDD改进算法及仿真研究
郝瑞1,刘晓峰2,牛砚波2,修磊1
(1. 山西财经大学 信息管理学院,太原 0300062. 太原理工大学,太原 030024)
摘要:支持向量数据描述(SVDD)将多类样本数据每一类用各自的超球来界定,显着降低了二次规划计算复杂度,更易于解决多类分类问题,因此在语音识别研究领域越来越受到广泛关注,本文针对语音样本分类中特征向量重叠和更新等问题,对现有的SVDD多类分类算法进行了改进,一方面,根据样本所在空间位置,构造超球重叠域决策函数;另一方面,基于类增量学习,实现超球类支持向量的动态改变。仿真实验结果表明,本文所提方法明显缩短了建模时间并且具有更好的识别性能。
关键词:支持向量数据描述;多类分类;决策函数;增量学习;语音识别系统仿真
中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2017) 05-1014-08
DOI: 10.16182/j.issn1004731x.joss.201705011
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基于脉冲输入电压的Buck-Boost变换器非线性特性研究
李小秋,张小平
(湖南科技大学海洋矿产资源探采装备与技术湖南省工程实验室,湘潭 411201)
摘要:为研究Buck-Boost变换器在脉冲输入电压作用下的非线性特性,建立了该变换器的离散迭代非线性映射模型,分别获得了该变换器输出电压随电感、电容和电阻变化时的分岔混沌图,分析了该变换器的分岔混沌现象,同时与该变换器在直流输入电压作用下的分岔混沌现象进行了对比分析,结果表明:稳态时该变换器在脉冲输入电压作用下比在直流输入电压作用下的分岔参数变化范围更小,并且更早地进入到混沌状态,这对于保证Buck-Boost变换器的稳定运行及混沌控制具有重要的指导意义。
关键词:Buck-Boost变换器;非线性特性;脉冲输入电压;分岔;混沌
中图分类号:TM46 ??????文献标识码:A?????? 文章编号:1004-731X (2017) 05-1021-07
DOI: 10.16182/j.issn1004731x.joss.201705012
Study on Nonlinear Characteristics of Buck-Boost Converter in Pulse Input Voltage
Li Xiaoqiu, Zhang Xiaoping
(Hunan Province Engineering Laboratory of Marine Mineral Resources Exploration Equipment and Technology,NRfag8879环亚手机|首页主页
Hunan University of Science and Technology, Xiangtan 411201, China)
Abstract: To study on the nonlinear characteristics of the Buck-Boost converter in pulse input voltage, the nonlinear model with discrete and iterative was deduced, and the bifurcation and chaos diagram that reflected the output voltage of the converter changes with the inductance, capacitance and resistance respectively was obtained, which analyzed the bifurcate and chaotic phenomena of the converter, and at the same time, compared with that in the DC input voltage. The results show that, in a steady state the variation range of bifurcation parameter of the converter in the pulse input voltage is smaller and is earlier to get into the chaotic state than that in the DC input voltage, which are of great significance for the steady operation of the Buck-Boost converter and its chaos control.
Keywords: Buck-Boost converter; nonlinear characteristics; pulse input voltage; bifurcation; chaos
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基于相似性模块度的层次聚合社区发现算法
占文威,席景科,王志晓
(中国矿业大学计算机学院, 江苏 徐州 221116)
摘要:Fast Unfolding是一种基于模块度优化的层次聚合社区发现算法,其优点是运行速度很快,不足之处是准确度有待提升,这是因为该算法采用传统模块度作为合并社区的衡量标准,而传统模块度函数在计算时只考虑节点间的链接信息,忽略邻居节点的影响,导致会出现两个节点共同邻居较多但由于节点间链接信息较弱不能被合并的情况,从而影响结果的准确度。针对该不足之处,通过引入优化后的相似度来改进Fast Unfolding算法的模块度函数,提出一种基于相似性模块度的层次聚合社区发现算法,并采用归一化互信息量即NMI(Normalized Mutual Information)作为评价算法准确性的指标,在真实网络和LFR(Lancichinetti Fortunato Radicchi)人工合成网络上进行实验,结果表明改进算法检测社区结构的准确度有明显改善。
关键词:Fast Unfolding算法;模块度;节点相似度;社区发现
中图分类号:TP393????? 文献标识码:A?????? 文章编号:1004-731X (2017) 05-1028-06
DOI: 10.16182/j.issn1004731x.joss.201705013
Hierarchical Agglomerative Community Detection Algorithm Based on Similarity Modularity
Zhan Wenwei, Xi Jingke, Wang Zhixiao
(College of Computer Science and Technology, China University of Mining and Technology, Xuzhou 221116, China)
Abstract: Fast Unfolding is a hierarchical community detection algorithm based on modularity. It runs very fast, but the accuracy needs to be improved. Because the algorithm adopts traditional modularity to merger communities, it only considers node link information and ignores the neighbor nodes. Therefore, two nodes that have common neighbors and weak link information may not be merged, thus affecting the accuracy. In view of the shortcomings, a hierarchical agglomerative community detection algorithm based on similarity modularity was proposed through introducing optimized similarity to improve the modularity. It adopts NMI as the accuracy measurement. Experiments on the real network and LFR synthetic network show that the accuracy of detecting community is obviously improved.
Keywords: fast unfolding algorithm; modularity; similarity; community detection
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动量方程瞬态项对单相受热管仿真模型的影响
康英伟1,2,王亚楠1,2,彭道刚1,2,郑鹏远1,2,杨平1,2
(1.上海电力学院自动化工程学院,上海 200090;2.上海发电过程智能管控工程技术研究中心,上海 200090)
摘要:给出了一个单相受热管模型,以某电站锅炉过热器受热管为对象,通过仿真研究了忽略动量方程瞬态项对模型性能的影响。研究发现,忽略动量方程瞬态项会显着降低单相受热管模型的动态精度,在各种阶跃扰动下忽略动量方程瞬态项都会使模型焓-温通道的动态响应速度加快近4倍,在入口蒸汽流量阶跃扰动下忽略动量方程瞬态项会改变模型压力-流量通道的动态特性类型;忽略动量方程瞬态项所换来的计算耗时下降不足7%;并且忽略瞬态项后模型保持数值稳定的能力也有所降低。
关键词:单相受热管;过热器;仿真模型;动量方程;瞬态项
中图分类号:TK 223.3????? 文献标识码:A?????? 文章编号:1004-731X (2017) 05-1033-08
DOI: 10.16182/j.issn1004731x.joss.201705014
Study on Effect of Neglecting Transient Terms of Momentum Equations on Simulation Models of Single Phase Heated Tubes
Kang Yingwei1,2, Wang Yanan1,2, Peng Daogang1,2, Zheng Pengyuan1,2, Yang Ping1,2
(1. College of Automation Engineering, Shanghai University of Electric Power, Shanghai 200090, China; 2. Shanghai Engineering Research Center of Intelligent Management and Control for Power Process, Shanghai 200090, China)
Abstract: A model of single phase heated tubes was presented, based on which the effect of neglecting transient terms of momentum equations on model performance was investigated by simulating a heated tube of the superheater of a power plant boiler. It is found that neglecting the transient terms of momentum equations can significantly decrease the dynamic accuracy of the model; under various step disturbances, neglecting the transient terms of momentum equations can speed up the dynamic response of the enthalpy-temperature channel of the model nearly 4 times; under the step disturbance of the inlet steam flux, neglecting the transient terms of momentum equations can change the type of dynamic characteristics of the pressure-flow channel of the model; whereas the corresponding decrease of computational consuming time is less than 7%; moreover, the ability to keep numerically stable also decreases.
Keywords: single phase heated tube; superheater; simulation model; momentum equation; transient term
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基于ADVISOR的氢电混合动力场地车仿真模型开发
黄明宇1,张政1,邓佳文1,陆琼晔2,倪红军1,周一丹1
(1.南通大学机械工程学院,南通 226019;2.南通职业大学汽车与交通工程学院,南通 226019)
摘要:氢燃料电池-蓄电池混合动力车相对单一氢燃料电池车具有许多优点,但其混合度和控制策略是一关键。汽车仿真软件ADVISOR(Advanced Vehicle Simulator)中没有设定仿真氢电混合动力场地车的车型和工况,结合实际车型,对软件中的燃料电池车型进行二次开发,修改部件参数和循环工况,针对其默认控制策略中蓄电池控制和燃料电池功率输出限制部分存在的缺陷进行分析和修改,并通过仿真验证,得到二次开发的车型能够在新建的工况下正常仿真和修改的控制策略更加合理的结果,搭建了针对控制策略控制效果的验证模块。
关键词:氢电混合动力场地车;ADVISOR(Advanced Vehicle Simulator);开发;控制策略
中图分类号:U469.72????? 文献标识码:A???? ??文章编号:1004-731X (2017) 05-1041-08
DOI: 10.16182/j.issn1004731x.joss.201705015
Redevelopment of Fuel Cell Ground Vehicle Simulation Model Based on ADVISOR Software
Huang Mingyu1, Zhang Zheng1, Deng Jiawen1, Lu Qiongye2, Ni Hongjun1, Zhou Yidan1
(1.School of Mechanical Engineering, Nan tong University, Nantong 226019, China;NRfag8879环亚手机|首页主页
2.School of Automobile and Traffic Engineering, Nantong Vocational University, Nantong 226019, China)
Abstract: Vehicle simulation software ADVISOR does not set a vehicle model and driving cycles which can be used to simulate ground vehicle. The fuel cell vehicle model was redeveloped in the software including changed parts parameters and driving cycles according the actual vehicles. The fault of battery control part and fuel cell power output limit part in the default control strategy was analyzed and modified. Through simulating, the results show that the redeveloped vehicle model can simulate on new driving cycles and control strategy is more reasonable. The verification module for control effects of the control strategy was set up.
Keywords: fuel cell ground vehicle; ADVISOR; develop; control strategy
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水产养殖环境因子数据动力学分析与智能预测
钟杰卓1,涂志刚2,杜文才1,吴慰1,3
(1. 海南大学信息科学技术学院,海南 海口 570228;2. 海南省海洋与渔业科学院,海南 海口 570206;3. 中国科学院三亚深海科学与工程研究所,海南 三亚 572000)
摘要:进行水质环境因素分析对水产养殖的效益极为重要。研究水体因素的三个主要参数:水温、pH值以及溶解氧。针对检测仪取样的数据存在缺失、不准确等问题,通过高阶曲线插值较好地修复了数据,同时运用滤波方法划分了系统误差以及参数的自身节律;对不同水层、时间的参数分析,较好地吻合了实际水文情况,为工程养殖提供了可靠的依据;通过引入径向基函数神经网络方法跟踪主要参数的特征,弥补了非线性多项式插值的不足,实际数据证明了该方法全局跟踪有效以及局部节律刻画程度精细。
关键词:水产养殖水质;动力学分析;非线性预测;人工智能神经网络
中图分类号:TP18????? 文献标识码:A?????? 文章编号:1004-731X (2017) 05-1049-09
DOI: 10.16182/j.issn1004731x.joss.201705016
Dynamics Analysis and Intelligent Prediction of Aquaculture Data
Zhong Jiezhuo1, Tu Zhigang2, Du Wencai1, Wu Wei1,3
(1. College of Information Science and Technology, Hainan University, Haikou 570228, China; 2. Hainan Academy of Oceam and Fisheries Sciences, Haikou 570206, China; 3. Sanya Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China)
Abstract: Data analysis on environmental factors data is crucial to aquaculture, in which three significant parameters were discussed, they are temperature, PH and dissolved oxygen. Fixing some missing data and inaccurate records in the sampling process by high-order curve fitting. Meanwhile, the use of filtering method was adopted to divide systematic errors and rhythms inside parameters. Analysis from different water layers and different time suited the true environment well, which provided effective references for engineering problems. Radial Basis Function Neural Networks was well applied in tracking the parameters trend both globally and locally.
Keywords: aquaculture quality; dynamic analysis; nonlinear prediction; artificial neural networks
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北斗GEO/IGSO卫星导航信号多径效应仿真研究
鲍亚川1,2,蔚保国1,2,秦明峰1,2,罗益1,2
(1. 中国电子科技集团公司第五十四研究所,石家庄 050081;2. 卫星导航系统与装备技术国家重点实验室,石家庄 050081)
摘要:以多径信号动态生成理论与多径效应误差影响理论相结合,针对北斗卫星导航系统所观测到的GEO卫星和IGSO卫星导航信号的伪距误差波动现象进行了研究,通过建立多种不同动态卫星的运动模型和镜面反射多径效应模型,实现了对卫星多径信号的动态误差模拟,对包括GEOIGSOMEO在内的不同动态卫星所产生的多径信号对伪距和载波相位测量造成的误差影响进行了理论分析和仿真研究。仿真实验结果与实际观测结果具有相似性,对最终揭示北斗系统GEOIGSO卫星导航信号的伪距波动误差现象的形成机理提供了新的依据和参考
关键词:伪距误差波动;卫星导航信号;多径效应;卫星动态
中图分类号:TN961 ??????文献标识码:A?????? 文章编号:1004-731X (2017) 05-1057-07
DOI: 10.16182/j.issn1004731x.joss.201705017
Simulation Research on the Multipath Effect of BDS GEO/IGSO Satellite Navigation Signals
Bao Yachuan1,2, Yu Baoguo1,2, Qin Mingfeng1,2, Luo Yi1,2
(1. The 54th Research Institute of CETC, Shijiazhuang 050081, China; 2. State Key Laboratory of Satellite Navigation System and Equipment Technology, Shijiazhuang 050081, China)
Abstract: Pseudo range measure error oscillation phenomenon was discovered in BDS GEO/IGSO satellites monitoring. Research on the phenomenon was made with multipath signal generation and multipath effect theory. The dynamic multipath effect of satellites including GEO, IGSO and MEO were simulated based on the construction of dynamic model of satellites and multipath mirror reflection model. Theory analysis and simulation were made on the pseudo range and carrier phase measure error caused by different dynamic multipath effect. The simulation result is similar with the measure result of practical observation, which gives a new reference for the final revelation of the reason of the range measure error oscillation phenomenon of BDS GEO and IGSO satellites.
Keywords: pseudo range measure error oscillation; satellite navigation signal; multipath effect; satellite dynamic
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基于计算树的航天遥测参数仿真
周倜,苗毅
(北京航天飞行控制中心,北京 100094)
摘要:航天测控仿真软件在每一次航天测控任务中都需要处理大量测控数据,不同参数的计算方法差别很大,在以往的应用中将计算方法以程序代码的形式固定在软件中,使得仿真系统难以进一步提高其可维护性和软件复用度。通过研究以配置文件的形式描述测控参数的计算方法,给出了参数计算灵活配置的设计方案,介绍了参数计算方法原理,软件模块、数据结构和处理算法。在该框架下,数据处理算法与软件代码相分离,使软件开发和具体航天型号任务之间的耦合度降低,增强了软件的可复用性,软件的稳定性也得到了有效保障。利用该方法对遥测参数进行了实验,验证了方法的有效性。
关键词:算法;计算树;配置文件;耦合度;可复用性
中图分类号:TP391??????? 文献标识码:A???????? 文章编号:1004-731X (2017) 05-1064-06
DOI: 10.16182/j.issn1004731x.joss.201705018
Telemetry Parameters Simulation of Spacecraft Based on Computation Tree
Zhou Ti, Miao Yi
(Beijing Aerospace Control Center, Beijing 100094, China)
Abstract: Simulation system of spacecrafts' Telemetry and Command (TT&C) needs to simulate lots of telemetry parameters in every missions, whose computing algorithms are different. In the past applications, these algorithms are fixed as codes in software programs, so it is very difficult to improve the maintainability and reuse of the simulation system. By studying the computing methods of telemetry parameters described in configuration files, a design scheme was given in which the algorithms of parameters were flexibly configured, and the principle of methods were described specially in computing parameters, software models, data structure and algorithms. In this framework, the algorithms dealing with data were separated from codes in software so that coupling degree was decreased between development of software and space missions, the reusability was enhanced, and the stability was protected effectively. In the experiment, telemetry parameters were computed by this methods, and the results show that this method is very effective.
Keywords: algorithm; computation tree; configuration files; coupling degree; reuseability
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双层教学楼人员疏散仿真研究
张学锋,白晨曦
(安徽工业大学计算机科学与技术学院,马鞍山 243000)
摘要:为了研究多层建筑的人员疏散问题,以双层教学楼为背景,基于事件/委托机制和多智能体技术,提出了人员视觉感知模型,并实现了模型间的通信交流。在考虑环境熟悉程度、生理和心理因子影响的基础上,建立了火灾数学模型和视觉感知模型,分析了出口、楼梯口和楼道火灾3种场景下的人员疏散情况,重点模拟了楼梯疏散中的人员行为准测。实验结果表明,该模型能够比较真实的体现火灾环境下的教学楼人员疏散情况,有助于多层建筑疏散问题的研究。
关键词:双层教学楼;多智能体;视觉感知;通信交流;楼梯疏散
中图分类号:TP273+.5????? 文献标识码:A?????? 文章编号:1004-731X (2017) 05-1070-07
DOI: 10.16182/j.issn1004731x.joss.201705019
Study of Crowd Evacuation in Two-Story Teaching Building
Zhang Xuefeng, Bai Chenxi
(College of Computer Science and Technology, Anhui University of Technology, Ma’anshan 243000, China)
Abstract: In order to study the multi-level building evacuation problem, visual perception and communication exchange of personnel model was achieved based on the Delegate/Event mechanism and Multi-agent technology, moreover, which set in two-story teaching building. Considering about the extent of the familiar environment, physiological and psychological factors, a mathematical model of fire and visual perception model was established, analyzing the personnel evacuation under three fire scenarios exit, stairs and corridor, moreover, focusing on simulation of personnel evacuation behavior in the stairway. The experimental results show that this model can truly reflect the building evacuation in fire environment, which contributes to the study of the multi-level building evacuation.
Keywords: two-story teaching building; Multi-Agents; visual perception; communication; evacuation in stairway
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基于代理模型的处理器结构设计空间探索算法
王宏伟1,2,3,朱子元1,2,石晶林1,2,苏泳涛1,2,石红梅1,2,3,刘智国1,2,3
(1. 移动计算与新型终端北京市重点实验室,北京 100190;2. 中国科学院计算技术研究所,北京 100190;3. 中国科学院大学, 北京 100190)
摘要:提出了一种新颖的基于代理模型的惩罚距离多目标期望改善(Penalty-Distance Multi-Objective Expected ImprovementPDMOEI)算法用于处理器结构设计空间探索(Design Space Exploration,DSE):利用克里金插值PDMOEI算法搜索帕雷托点集,得到关于多目标全局优化的结构参数配置。将提出的算法与MOEI (Multi-Objective Expected Improvement)算法、NSGA-II (Non-dominated Sorting Genetic Algorithm II)算法以及MA-NSGA-II (Metamodel-Assisted NSGA-II)算法,通过两组实验进行了比较。以近似帕雷托点相对于真实帕雷托点的相近程度及覆盖程度为评价指标,得出所提算法均优于其他算法。技术构建一个代理模型采用基于代理模型的
关键词:设计空间探索;代理模型;克里金插值;多目标期望改善
中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2017) 05-1077-09
DOI: 10.16182/j.issn1004731x.joss.201705020
Surrogate Model Based Processor Architectural Design Space Exploration Algorithm
Wang Hongwei1,2,3, Zhu Ziyuan1,2, Shi Jinglin1,2, Su Yongtao1,2, Shi Hongmei1,2,3, Liu Zhiguo1,2,3
(1. Beijing Key Laboratory of Mobile Computing and Pervasive Device, Beijing 100190, China; 2. Institute of Computing Technology, Chinese Academy of Sciences, Beijing 100190, China; 3. University of Chinese Academy of Sciences, Beijing 100190, China)
Abstract:A novel surrogate model based penalty-distance multi-objective expected improvement (PDMOEI) algorithm was proposed for processor architectural design space exploration (DSE): first using a Kriging interpolation technique to construct a surrogate model, then adopting the surrogate model based PDMOEI algorithm to search the Pareto points and finding the globally multi-objective optimized architectural parameter configurations. The proposed algorithm was compared with the multi-objective expected improvement (MOEI) algorithm, the non-dominated sorting genetic algorithm II (NSGA-II) algorithm and the metamodel-assisted NSGA-II (MA-NSGA-II) algorithm by performing two experiments. Experimental results show that, the proposed algorithm achieves better Pareto points pursuing performance than the other algorithms in both the closeness of the obtained approximating Pareto points to the actual Pareto points and the coverage of the actual Pareto points.
Keywords: design space exploration; surrogate model; Kriging interpolation; multi-objective expected improvement
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基于预测控制的弓网系统半主动控制策略研究
任志玲1,林冬1,王月2,张广全1
(1. 辽宁工程技术大学电气与控制工程学院,辽宁 葫芦岛 125105;2. 国网佳木斯供电公司,黑龙江 佳木斯 154000)
摘要:针对弓网耦合问题,提出了弓网系统的半主动控制策略。根据建立的弓网模型和接触力历史数据,利用预测控制技术,预测下一时刻接触力MPC控制器将计算结果输出给电流变阻尼器;由电流变阻尼器提供接触力的控制输入变化量,使得实际值接近于理论值。实验结果表明:半主动控制策略在弓网系统的应用,能有效提高弓网耦合质量,抑制离线电弧的发生,优化受流质量。;将预测值与理论值对比计算误差,
关键词:弓网系统;半主动控制;电流变阻尼器;预测控制
中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2017) 05-1086-07
DOI: 10.16182/j.issn1004731x.joss.201705021
Research on Semi-active Control Strategy of High Speed Railway Pantograph-Catenary System Based on Model Predictive Control
Ren Zhiling1, Lin Dong1, Wang Yue2, Zhang Guangquan1
(1. Faculty of Electrical and Control Engineering, Liaoning Technical University, Huludao 125105, China; 2. State Grid Jiamusi Power Supply Company, Jiamusi 154000, China)
Abstract: For the pantograph catenary coupling problem, the semi-active control strategy of pantograph catenary system was proposed. According to the established pantograph catenary model and the contact force history data, it used the MPC prediction technique to predict the next moment of contact force. The predicted value and the theoretical value error were calculated, and the MPC controller output the calculated results to the ER damper. The change of the control input of the contact force was provided by the current damper, which made the actual value close to the theoretical value. Experimental results show that the semi-active control strategy in the application of the pantograph catenary system, effectively improve the coupling quality of pantograph and catenary, restrain the occurrence of off-line arc, and optimize the quality of the flow.
Keywords: pantograph-catenary system; semi-active control; electro-rheological damper; MPC
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自私性移动P2P网络中高效的资源搜索机制
刘浩1,张学龙2*
(1. 湖南人文科技学院信息学院,湖南 娄底 417000;2. 长沙师范学院电子信息工程系,湖南 长沙 410100)
摘要:由于移动P2P(Peer-to-Peer)网络中节点自身状态等因素的影响,节点往往表现出自私性和资源偏好性,这极大地影响了网络系统的资源搜索效率。针对该问题,给出了一种移动P2P网络中基于节点协同合作度的资源搜索机制。该搜索机制通过综合评价节点的信息转发率、综合相似度与核心度,选择协同合作度高的节点作为中继节点进行信息转发;同时,通过分析节点的主观转发率以建立其激励机制,激励节点参与资源搜索。分析与实验结果表明该搜索机制能够有效地提高整个系统的资源搜索成功率,降低其平均搜索长度,具有较好的查询性能。
关键词:移动P2P网络;协同合作度;自私性;资源搜索;激励机制
中图分类号:TP393 ??????文献标识码:A?????? 文章编号:1004-731X (2017) 05-1093-10
DOI: 10.16182/j.issn1004731x.joss.201705022
Efficient Resource Search Mechanism in Selfish Mobile Peer-to-Peer Network
Liu Hao1, Zhang Xuelong2*
(1. Institute of Information, Hunan University of Humanities, Science and Technology, Loudi 417000, China; 2. Development of Electronic and Information Engineering, Changsha Normal University, Changsha 410100, China.)
Abstract: Because of the influence of node's own state and other factors, the node in mobile P2P network often shows the selfishness and resource preference, which greatly affects the resource search efficiency of the network system. Aiming at this problem, a novel resource search mechanism was proposed based cooperation degree of nodes in selfish mobile Peer-to-Peer network. In the search mechanism, through the comprehensive evaluation of the node's information forwarding rate, the overall similarity and the core degree, the node with the highest degree of cooperation was selected as the relay node for information forwarding.At the same time, through the analysis of the node's subjective forwarding rate, this search mechanism established its incentive mechanism, which incentives the node to participate in resource search.Analysis and simulation show that the search mechanism can effectively improve the success rate of resource search in the whole system, reduce the average search length, and has better query performance.
Keywords: mobile Peer-to-Peer network; cooperation degree; selfishness; resource search; incentive mechanism
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基于激光成像雷达的未知目标相对位姿估计算法
宋亮1,李志1,马兴瑞2
(1. 中国空间技术研究院钱学森空间技术实验室,北京 100081;2. 广东省政府,广东 广州 510031)
摘要:为解决对空间未知目标的相对位置、姿态估计问题,以激光成像雷达作为测量敏感器,提出了基于扩展Kalman滤波(EKF, Extended Kalman Filter)的相对位姿估计算法。采用迭代最近点算法(Iterative Closest Point,ICP)对激光雷达的点云测量数据进行解算,得到相对位姿粗值并将其作为位姿估计算法的测量输入。以相对姿态、角速度、惯量比、相对位置、相对速度和目标测量参考系的位姿作为滤波状态,算法在对相对位置和姿态估计的同时,可辨识出目标的未知参数。为提高数值仿真的可信度,用Geomagic软件模拟点云测量。采用Matlab进行数值仿真,验证了新算法的有效性。
关键词:激光成像雷达;相对位姿估计;未知目标;视觉相对导航;扩展卡尔曼滤波
中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2017) 05-1103-09
DOI: 10.16182/j.issn1004731x.joss.201705023
LIDAR-Based Relative Position and Attitude Filtering for Unknown Targets
Song Liang1, Li Zhi1, Ma Xingrui2
(1. China Academy of Space Technology, Qian Xuesen Laboratory of Space Technology, Beijing 100091, China;NRfag8879环亚手机|首页主页
2. Government of Guangdong Province, Guangzhou 510031, China)
Abstract: A LIDAR-Based Extended Kalman Filter (EKF) for relative position and attitude estimation of unknowns target was proposed. The relative position and attitude between the target and a servicing spacecraft was solved by the Iterative Closet Point (ICP) using LIDAR point cloud data, which served as the EKF’s measurement input. The system states of EKF include the relative attitude, angular velocity, inertia ratios, relative position, relative velocity, and the position/attitude of target measurement reference frame with respect to target principle frame. The proposed filter estimated the relative position and attitude as well as the unknown parameters of the target. To improve the confidence of numerical simulation, geomagic was used to simulate the point cloud data of LIDAR. A simulation based on Matlab verifies the proposed algorithm.
Keywords: LIDAR; relative position and attitude estimation; unknown object; vision-based relative navigation; extended Kalman filter
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基于相机标定的全景图拼接方法研究
马嘉琳1,张锦明1,2*,孙卫新1
(1. 信息工程大学地理空间信息学院,河南 郑州 450052;2. 中国科学院遥感与数字地球研究所,北京 100081)
摘要:提出了一种基于相机标定的全景图拼接方法,对待拼接图像进行几何畸变矫正与旋转变换处理,提高图像配准的精度与全景图的拼接质量。通过相机线性标定得到单应矩阵,分离单应矩阵的内外参数。利用内参数,计算图像的径向畸变,矫正图像的几何畸变;利用外参数,将待拼接的序列图像转化在同一世界坐标系下;利用图像的同名像点实现图像的快速精确配准,实现全景图的高质量拼接。实验结果表明,使用该方法可以获得较高的拼接精度,拼接过程直观且不会发生误匹配。
关键词:全景图;相机标定;图像拼接;图像矫正;图像配准
中图分类号:P208 ?????文献标识码:A?????? 文章编号:1004-731X (2017) 05-1112-08
DOI: 10.16182/j.issn1004731x.joss.201705024
Research on Panoramic Image Mosaic Method Based on Camera Calibration
Ma Jialin1, Zhang Jinming1,2*, Sun Weixin1
(1. Institute of Geospatial Information, Information Engineering University, Zhengzhou 450052, China; 2. Institute of Remote Sensing and Digital Earth Chinese Academy of Sciences, Beijing 100081, China)
Abstract: A panoramic mosaic method was proposed based on camera calibration, geometric distortion correction and rotation transformation processing was done for stitching image, in order to improve the accuracy of image registration and panorama stitching quality. The homography was acquired by calculating the camera linear calibration, and the inside and outside parameters of the homography were separated. The radial distortion of the image was calculated by the inside parameters, and the image geometric distortion was corrected; a sequence of images was transformed in the same world coordinates using the external parameters; image registration was achieved accurately though the same name point of a sequence of images, and the high quality of the panoramic image stitching was achieved. Experiment verifies that this method effectively reduces the large amount of calculation in panorama stitching, process of stitching accuracy is higher, intuitive, and matching error will not occur.
Keywords: panorama; camera calibration; image stitching; image correction; image registration
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质心Power图下覆盖路径规划算法
郑利平,程亚军,路畅,廖婷
(合肥工业大学计算机与信息学院,安徽 合肥 230009)
摘要:覆盖路径规划算法广泛应用于移动传感网络、群机器人系统等领域。研究基于质心容量限制Power图下的覆盖算法,对经典Lloyd方法进行扩展,在生成质心Power图的Lloyd算法基础上,改进后得到可用于路径规划的PD-Lloyd算法,考虑实际场景中个体移动的物理特性,给出两种优化策略,以增强算法效果和可信性。实验证明:该算法稳定性好,具有内在避碰特性,能产生较优的运动路径。
关键词:Power图;覆盖路径规划;Lloyd方法;人群仿真
中图分类号:TP391.9?????? 文献标识码:A???????? 文章编号:1004-731X (2017) 05-1120-06
DOI: 10.16182/j.issn1004731x.joss.201705025
Coverage Path Planning Algorithm Based on Centroidal Power Diagram
Zheng Liping, Cheng Yajun, Lu Chang, Liao Ting
(Schoolof Computer and Information, Hefei University of Technology, Hefei 230009, China)
Abstract: Coverage path-planning algorithm is widely used in mobile sensor networks, multi-robot system, and other fields. The coverage path planning algorithm based on CCCPD(Centroidal Capacity Constrained Power Diagram) was studied. The classical Lloyd based generating method for Centroidal Power Diagram was extended to PD-Lloyd algorithm, which could be used for path-planning. Two optimizing strategies were proposed to enhance the credibility of the PD-Lloyd algorithm by considering the physical moving characteristics of individuals in the real scene. Experiments prove that the proposed algorithm has advantages of well stability and inherent collision-free characteristic, and can generate more optimal motion path.
Keywords: Power diagram; coverage path planning; Lloyd method; crowd simulation
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基于Woodcock Tracking的快速蒙特卡罗直接体绘制方法
周守东
(安徽工业经济职业技术学院,安徽 合肥 230051)
摘要:Woodcock-Tracking采样算法是一种常用的光线采样方法,对于优化蒙特卡罗直接体绘制方法具有重要的作用。目前该方法没有考虑体数据不同区域颜色的变化,导致颜色变化剧烈的区域可能只有少量采样点,影响体数据的真实性。引入信息熵表征体数据不同区域变化的剧烈程度,基于信息熵发展了自适应Woodcock-Tracking方法,使得变化剧烈区域获取更多采样点;运用加权颜色合成算法,实现无偏渲染。通过对头颅、背包和骨骼三个模型的对比测试,结果均表明该方法对渲染质量有明显改善。
关键词:直接体绘制;全局光照;蒙特卡罗光线跟踪;信息熵;Woodcock-Tracking
中图分类号:TP391.41????? 文献标识码:A?????? 文章编号:1004-731X (2017) 05-1125-07
DOI: 10.16182/j.issn1004731x.joss.201705026
Woodcock Tracking Based Fast Monte Carlo Direct Volume Rendering Method
Zhou Shoudong
(Anhui Technical College of Industray and Economy, Hefei 230051, China)
Abstract: Woodcock-Tracking sampling algorithm is a frequently applied ray sampling method, which plays an important role in optimizing the Monte Carlo direct volume rendering method. However, without considering the volume of color’s variation in different region by using this method, the situation that region with great color’s variation may only get a few samples was caused and the authenticity of volume data would be affected. Entropy to indicate color’s variation in volume was introduced, an entropy based adaptive Woodcock-Tracking method was developed, which could sample more points in region with higher color’s variation. To overcome biases caused by adaptive Woodcock-Tracking method, weighted color evaluation method was used, so that the final render result image was unbiased. Through the contrast test on the three models of head, backpack and skeleton, the result demonstrates the presented method is superior to the current method in the aspect of improving the rendering quality obviously.
Keywords: direct volume rendering; global illumination; Monte Carlo tay tracing; entropy; woodcock-tracking
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异构分布式系统动态实时容错调度启发式算法
董崇杰1,陈俞强1,2
(1. 东莞职业技术学院,广东 东莞 523808;2. 广东工业大学,广东 广州 510006)
摘要:传统的异构分布式实时调度算法基本没有考虑任务的动态特性。提出一种非周期不可抢占式异构分布式的动态容错模型,在该模型上基于不同调度需求给出两种不同容错调度算法:DRFSA(Dynamic and Reliability-driven of hybrid with Fault-tolerant Scheduling Algorithm)算法与DSFSA(Dynamic and Schedulability-driven of hybrid with Fault-tolerant Scheduling Algorithm)算法。DRFSA算法以提高可靠性代价为调度目标,通过合理调度提高系统可靠性。DSFSA算法以可调度性为调度目标,通过减少任务执行时间来增加系统可调度性。算法能够在异构系统中调度动态的实时任务,且能够尽可能响应任务需求。
关键词:基/副版本;动态实时任务;异构分布式;可靠性;可调度性
中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2017) 05-1132-09
DOI: 10.16182/j.issn1004731x.joss.201705027
Real-Time Scheduling Algorithm of Dynamic with Fault-Tolerant in Heterogeneous Distributed Systems
Dong Chongjie1, Chen Yuqiang1,2
(1. Dongguan Polytechnic, Dongguan 523808, China; 2. Guangdong University of Technology, Guangzhou 510006, China)
Abstract: The traditional heterogeneous distributed real-time scheduling algorithm didn't give consideration to the dynamic behavior of tasks. An aperiodic non-preemptible and heterogeneous distributed dynamic fault-tolerant model and presenting two fault-tolerant scheduling algorithms was proposed based on this model: DRFSA algorithm and DSFSA algorithm. DRFSA(Dynamic and Reliability-driven of hybrid with Fault-tolerant Scheduling Algorithm)algorithm is to improve the system reliability as the scheduling objective through the reasonable scheduling. DSFSA (Dynamic and Schedulability-driven of hybrid with Fault-tolerant Scheduling Algorithm) algorithm is to improve schedulability as the scheduling objective and tries to enhance the schedulability through less task execution time. Both algorithms can dispatch the dynamic real-time tasks in the heterogeneous system andsimultaneously can respond to the task demands as far as possible.
Keywords: primary copy/backup copy; dynamic real-time task; heterogeneously distributed; reliability; schedulability
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基于混合优化映射算法的NoC自动生成方法研究?
李君艺1,刘怡俊2,乐建亮2
(1. 广东理工职业学院工程技术系,广东 广州 510091;2. 广东工业大学计算机学院,广东 广州 510006)
摘要:针对片上网络映射算法中,粒子群优化算法对于离散的优化问题处理不佳,容易陷入局部最优问题,提出了一种基于粒子群优化(particle swarm optimization, PSO)算法和遗传算法(genetic algorithm, GA)的混合优化映射算法(PSO_GA)。选择两个种群分别进行GA和PSO操作,由GA算法中的优良个体代替PSO算法中的初始随机粒子,保留优良粒子的同时,又维持了群体的多样性并提高搜索效率。基于NS-2仿真实验结果表明,采用混合优化映射算法的自动生成工具得出的片上网络对比同等计算规模下的随机映射方式,在网络延迟、吞吐量、链路带宽等方面有明显的优化。
关键词:2D Mesh;混合算;NoC映射;NS-2
中图分类号:TP273+.5????? 文献标识码:A?????? 文章编号:1004-731X (2017) 05-1141-06
DOI: 10.16182/j.issn1004731x.joss.201705028
Research on Network-on-Chip Synthesis Flow Based on Hybrid Optimization Mapping Algorithm
Li Junyi1, Liu Yijun2, Le Jianliang2
(1. Guangdong Polytechnic Institute, Guangzhou 510091, China; 2. Guangdong University of Technology, Guangzhou 510006, China)
Abstract: To solve the problem of particle swarm optimization algorithm, which is easy to fall into local optimum in network on chip mapping, a hybrid optimization mapping Algorithm based on particle swarm optimization and genetic algorithm was proposed. It implemented GA and PSO separately with two groups, by the superior individuals from GA algorithm instead of the initial random particles from PSO algorithm, which not only maintained the diversity of the group but also improved search efficiency. Simulation results based on NS-2show that the Network-on-Chip from the automatic generation tools have a good performance in network latency, throughput, and link bandwidth optimization comparing the random mapping under the same amount of computation scale.
Keywords: 2D Mesh; hybrid algorithm; NoC mapping; NS-2
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一种基于特征点跟踪的多影像匹配算法
贾开开,张振杰,郝向阳
(解放军信息工程大学,河南 郑州 450001)
摘要:在序列影像中,考虑到相邻帧影像的运动随时间变化比较缓慢,可以将光流法用于影像匹配过程中,提出了一种基于特征点跟踪的多影像匹配算法。通过光流法对特征点在帧间进行跟踪,结合匹配判别准则和FB Error算法实现相邻帧影像的快速准确匹配,利用多帧影像间的特征点跟踪实现多影像匹配。实验表明:该算法相比于传统的特征点匹配算法,提高了计算效率并保持了较好的匹配准确率。
关键词:光流法;特征点跟踪;多影像匹配;FB Error
中图分类号:TP277????? 文献标识码:A?????? 文章编号:1004-731X (2017) 05-1147-07
DOI: 10.16182/j.issn1004731x.joss.201705029
Novel Method on Features Tracking for Multi-image Matching
Jia Kaikai, Zhang Zhenjie, Hao Xiangyang
(Information Engineering University, Zhengzhou 450000, China)
Abstract: Considering the slow motion between adjacent frames in image sequence, optical flow can be applied on image matching. A novel method for multi-image matching based on features tracking was proposed. The algorithm tracked features between adjacent frames, combining with matching strategy and FB Error, to achieve fast and accurate matching. Multi-image matching was finished by tracking features between image sequence. The experimental results show that the novel algorithm improves the efficiency and ensure the accuracy.
Keywords: optical flow; features tracking; multi-image matching; FB Error
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基于合作对策论的网络安全态势组合预测模型
柯钢
(东莞职业技术学院计算机工程系,广东 东莞 523808)
摘要:网络安全态势受多种复杂因素影响,具有高度非线性、时变性、突变性等特点,使得传统上的单一预测模型存在预测精度低的问题。针对这一不足,结合合作策略论,提出一种新的网络安全态势组合预测模型。通过Elman神经网络模型、GM(1, 1)模型、支持向量机模型分别对网络安全态势进行预测,运用合作对策中的Shapley值法,对单一模型的预测结果进行加权运算得到组合预测结果,对真实网络安全态势数据进行仿真测试。仿真结果表明,组合预测模型有效提高了网络安全态势预测精度。
关键词:网络安全态势;Elman神经网络;GM(1,1);支持向量机;组合预测
中图分类号:TP393.08????? 文献标识码:A?????? 文章编号:1004-731X (2017) 05-1153-07
DOI: 10.16182/j.issn1004731x.joss.201705030
Combination Model of Network Security Situation Prediction Based on Cooperative Games
Ke Gang
(Department of Computer Engineering, Dongguan Polytechnic, Dongguan 523808, China)
Abstract: Influenced by a variety of complicated factors, the network security situation has many characteristics, such as highly nonlinear, time-varying, and mutant. It is difficult to predict accurately with a single prediction method. In response to this shortage, a new combined prediction model for network security situation was proposed based on cooperation policy theory. The network security situation was predicted respectively by using the Elman neural network model, GM(1,1)model, support vector machine (SVM) mode. The Shapley value method of cooperative games was applied to determine the weight of each single prediction model, and the prediction results were weighted calculated to get the final combined prediction results of network security situation. The actual network security data were used for simulation testing. The simulation results show that combination prediction model can effectively improve the network security situation prediction accuracy.
Keywords: network security situation; Elman neural networks; GM(1,1); support vector machine(SVM); combination prediction
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