Fuzzy spatial constraints and ranked partitioned sampling approach for multiple object tracking

While particle filters are now widely used for object tracking in videos, the case of multiple object tracking still raises a number of issues. Among them, a first, and very important, problem concerns the exponential increase of the number of particles with the number of objects to be tracked, that can make some practical applications intractable. To achieve good tracking performances, we propose to use a Partitioned Sampling method in the estimation process with an additional feature about the ordering sequence in which the objects are processed. We call it Ranked Partitioned Sampling, where the optimal order in which objects should be processed and tracked is estimated jointly with the object state. Another essential point concerns the modeling of possible interactions between objects. As another contribution, we propose to represent these interactions within a formal framework relying on fuzzy sets theory. This allows us to easily model spatial constraints between objects, in a general and formal way. The association of these two contributions was tested on typical videos exhibiting difficult situations such as partial or total occlusions, and appearance or disappearance of objects. We show the benefit of using conjointly these two contributions, in comparison to classical approaches, through multiple object tracking and articulated object tracking experiments on real video sequences. The results show that our approach provides less tracking errors than those obtained with the classical Partitioned Sampling method, without the need for increasing the number of particles.     

基于VC＋＋和TekVISA的取样示波器控制

在PCB生产线上,阻抗的测试尤其重要。传统的阻抗测试需要手工对取样示波器进行设置,不仅耗时而且效率低下。本文以泰克DSA8200取样示波器为例,首先介绍了使用TekVISA编程的方法和IPC—TM－650校准方法,然后利用面向对象的编程工具VC＋＋为其开发了控制程序,通过PC对取样示波器进行参数设置、发送命令、读取波形等一系列操作,最终控制取样示波器完成了特性阻抗的校准和测试。     

Powder Mixing

The factors affecting powder mixing are reviewed. Methods of analyzing a random mix are discussed (indices, the Poisson distribution, and analyses of variance [ANOVA]). The influence of particle size, shape, and density are described, along with scale of scrutiny and sampling. Segregation and agglomeration are major problems in powder mixing, and their prevention and minimization are therefore paramount. Ordered mixing reduces segregation, but also introduces other problems. Regulating the particle size of the drug and altering particle shape minimizes segregation and agglomeration.     

计算机控制铝电解生产数据采集系统的实践

数据采集系统在计算机过程控制中有着十分重要的作用。本文介绍三菱公司可编程Ａ／Ｄ转换器Ａ１Ｓ６４ＡＤ、输出模板Ａ１ＳＹ１０和电压隔离传感器ＷＢ３２１组成的计算机控制铝电解生产数据采集系统设计方法,分析解决实际应用中出现的问题。     

交流采样测量电量的精度问题及解决方法

本文根据交流电量基本原理 ,分析了微机交流采样影响精度的因素 ,并探讨了解决的方法。     

电感耦合等离子体离子源分析性能的影响因素探究

ICP(电感耦合等离子体)离子源是目前质谱分析中最常用的离子源之一,具有电离效率高、分析产物主要为单电荷离子等特点。因其优良的性能,现已广泛应用于不同行业中。为了继续提升ICP-MS(电感耦合等离子体质谱)的分析性能,拓宽应用领域,许多学者通过实验研究,建模仿真对ICP离子源进行了深入研究。本文对这些工作进行了阐述,介绍了不同的影响因素对等离子体特性的影响。如气体流速、功率大小、采样深度等,并对有无质谱采样接口时的等离子体的特性进行比较,为优化等离子体离子源提供思路。     

Latin America： A Focus Area of China＇s Overseas Oil Development

Chinese oil companies have attached great importance to oil and gas cooperation with Latin American countries. For example, China National Petroleum Corporation （CNPC）, which works in more than 30 countries, also has operations in a number of Latin American countries, including Brazil, Colombia, Costa Rica, Cuba, Ecuador and Venezuela. CNPC has stepped up its business presence in Latin America through large-scale acquisitions ofoil and gas assets in the region in recent years.     

烟田杂草香附子空间格局及抽样技术研究

本研究对杂草香附子（CyperusrotundusL．）在烟田的分布调查资料进行空间格局测定，结果表明：杂草香附子在烟田呈明显的聚集分布格局。利用有草作方频率和空间格局特征参数，对烟田杂草香附子种群密度进行估测，并建立相应的理论抽样数模型和序贯抽样模型。利用田间杂草实地分布图进行抽样比较，得出采用分行式抽样方法最佳。     

Methodology to estimate parameters of an excitation system based on experimental conditions

A methodology to estimate the parameters of a potential-source controlled rectifier excitation system model is presented in this paper. The proposed parameter estimation methodology is based on the characteristics of the excitation system. A comparison of two pseudo random binary signals, two sampling periods for each one, and three estimation algorithms is also presented. Simulation results from an excitation control system model and experimental results from an excitation system of a power laboratory setup are obtained. To apply the proposed methodology, the excitation system parameters are identified at two different levels of the generator saturation curve. The results show that it is possible to estimate the parameters of the standard model of an excitation system, recording two signals and the system operating in closed loop with the generator. The normalized sum of squared error obtained with experimental data is below 10%, and with simulation data is below 5%.     

拉丁美洲化妆品市场展望

2010年拉丁美洲化妆品市场在巴西BRIC的带领下保持坚挺,并可能继续保持稳步增长。拉丁美洲各国的化妆品工业在2010年第1季度都有不同程度的增长,对化妆品工业市场今后的发展也都持乐观的态度。各国的化妆品公司正在寻求与拉丁美洲的合作,以求获得更大的发展。