基于DPM和KCF的十字靶标检测与跟踪

为了实现对十字靶标的自动检测与跟踪,建立了十字靶标检测跟踪模型。针对目标检测中运算量大、实时性差、目标跟踪需要人工标定视频初始帧的问题,提出了一种基于可变形部件模型(DPM)和核相关滤波器(KCF)的十字靶标检测跟踪算法。首先,提取十字样本集的梯度方向直方图(HOG)特征,采用Latent SVM分类器训练特征集,生成十字靶标物体类的DPM模型。然后,通过滑动窗口搜索匹配方法遍历待检测图片。最后,将检测到的结果作为跟踪算法的起始跟踪帧,应用KCF算法快速跟踪目标。当跟踪目标丢失时,暂时停止跟踪,利用DPM模型重新检测定位目标再进行跟踪。实验结果表明:采用DPM模型检测的平均帧率为1 fps,结合DPM和KCF算法,实时检测跟踪的平均帧率为40 fps。采用基于可变形部件模型(DPM)和核相关滤波器(KCF)的十字靶标检测跟踪算法,实现了目标的自动检测与实时跟踪,且检测速度明显高于传统算法,并且在目标漂移或丢失后自动重新定位并继续跟踪,完成十字靶标的长时间跟踪。     

最大熵方法及其在自然语言处理中的应用研究

本文研究当前的自然语言处理状况和最大熵方法的发展,着重探讨最大熵方法在自然语言处理的过程中的应用范围,希望能为相关人士提供有效参考。     

基于步进电机控制的大空间火灾精确定位原理设计

常规喷淋灭火系统的保护净空高度在8m以内.而在今天,大型车站、机库、仓库、电视塔的超级工程出现,新的挑战也随之出现,经过人们的不段探索和努力另一个消防领域应运而生,那就是大空间场所智能消防系统."大空间场所"是指民用和工业建筑内净空高度大于8m,仓库建筑物内净空高度大于12m的场所(中国工程检测协会标准《大空间智能型主动喷水灭火系统技术规程》CECS 263:2009规定).     

Two new saponins from the aerial part of Astragalus membranaceus var. mongholicus

Two new saponins named mongholicoside A (1) and mongholicoside B (2) were isolated from the aerial part of Astragalus membranaceus var. mongholicus. Their structures were determined by 1D and 2D NMR, ESI-MS techniques and chemical methods.     

Ionic solvation in water + co-solvent mixtures. Part 8. Total free energies of transfer and free energies of transfer with the “neutral” component removed of single ions from water into water + acetone

The acid dissociation constants of a wide range of acids in water+acetone mixtures have been combined with values for the free energy of transfer of the proton. ΔG⁰_t(H⁺ to calculate values for the free energy of transfer of ions which derive only from the charge on the ion. ΔG⁰_t(i)_c. As the values of ΔG⁰_t(H⁺) have been revised, revised values for the total free energies of transfer of cations and anions, ΔG⁰_t(M⁺) and ΔG^o_t(X^-), are given. New data for ΔG^o_t(MX_n) is also split into values for ΔG⁰_t(Mⁿ⁺) (where n=1 and 2) and ΔG⁰_t(X^?). These free energies of transfer, both total and those deriving from the charge alone, are compared with similar free energies in other mixtures water+co-solvent. Values for ΔG^o_t(i)_c do not conform to a Born-type relationship and show the importance of structural effects in the solvent even when only the transfer of the charge is involved.     

Non-additivity in water-ion-water interactions

The three-body system Li⁺(H₂O)₂ was analyzed to study that non-additive part of the interaction potential which can be obtained by the Hartree-Fock approximation.For long and intermediate distances the three-body correction was found to be well represented by the induction energy, where bond dipoles are induced on each water molecule by point charges located on the (unpolarizable) lithium ion and on the other molecule respectively: for shorter distances this approximation was corrected by means of an exponential repulsive term. Such a potential model for non-additive interactions was extended to the more general situation Li⁺(H₂O)_n, and Monte-Carlo calculations were carried out on clusters containing up to six water molecules; comparison with other simulation results and with available data showed a significantly improved agreement with experiment. Tentative values for H are presented for n =7, 8,..., 20, where experimental data are not available.     

Biexponential C spin-lattice relaxation behavior of the crystalline region of ethylene copolymers and its origin

In this work, two series of ethylene-dimethylaminoethylmethacrylate (EDAM) and ethylene-methyl acrylate copolymers (EMA) with different comonomer content were studied by high-resolution solid-state ¹³C NMR spectroscopy. Biexponential ¹³C spin-lattice relaxation behaviors of the crystalline region were observed for all copolymer samples either melt-quenched or isothermally crystallized. The relative content of the shorter ¹³C T₁ component to that of the longer ¹³C T₁ component was found to increase with comonomer content. By employing a new pulse sequence which can be considered as a combination of Goldman-Shen's and Torchia's pulse sequences, it was demonstrated that the shorter ¹³C T₁ component is corresponding to the intermediate part of the crystalline region. The thickness of the intermediate part is estimated to be about 0.85 nm.     

某型航空用超期电子元器件的使用问题探讨

长期以来，航空电子元器件的超期使用问题一直都是航空电子产品可靠性研究的一个重要课题。从元器件的固有可靠性和使用可靠性两个方面。对CBCB118双达林顿管在某型航空产品上的使用问题进行了分析和探试。