将目标分割技术引入跟踪领域是当前的研究热点.目前,基于分割的跟踪算法往往根据分割结果计算最小外接矩形,以此作为跟踪框,但复杂的目标运动使得跟踪框内包含较多背景,从而导致精度下降.针对该问题,本文提出了一种基于前景优化的视觉目标跟踪算法,将跟踪框的尺度和角度优化统一于前景优化框架中.首先评估跟踪框内的前景比例,若小于设定阈值,则对跟踪框分别进行尺度和角度优化;在尺度优化模块中,结合回归框计算跟踪框的条件概率,根据条件概率的结果分情形进行尺度优化;角度优化模块中,针对跟踪框设定多个偏移角度,利用前景IoU(Intersection over Union)极大策略选择最优跟踪框角度.结果证明,将本文方法应用于SiamMask算法,精度在VOT2016,VOT2018和VOT2019数据集分别提升约3.2%,3.7%和3.6%,而EAO分别提升约1.8%,1.9%和1.6%.另外,本文的方法针对基于分割的跟踪算法具有一定的普适性.
本文首先介绍了二维材料与耦合机制,随后基于紧束缚近似理论研究二维耦合无序量子扩散现象,运用解析及数值的方法证实了二维耦合体系横向及纵向传播中的同步量子扩散周期性振荡。研究表明:双层无序石墨烯体系周期性振荡对无序度承受能力相对双层无序四方晶格体系更强。边界无序体系周期性振荡任意无序度下均存在。当无序仅处于系统边界,Pk(t),dk(t)振荡在波包到达边界后开始以yk(t)=0.5±0.5e−t/t0cos(2vt+ϕ),yk(t)=Pk(t)或d¯k2(t)函数衰减,衰减速度符合1/t0~W1.75,较双层无序系统衰减更慢。边界无序系统周期性衰减速度随W存在由增加到降低的转变,强无序下出现W越大衰减速度越慢的反常量子扩散现象。边界无序体系中量子扩散周期性振荡始终存在。研究表明:这一周期性振荡是由层间量子跳跃导致,是各层无差异能谱的结果,与体系形状、大小、边界条件、以及格点能大小无关,且适用于不同原子结构体系。无序系统中层间能谱差异性导致了周期性振荡的衰减,其衰减速度与频率可分别通过体系无序度W与层间耦合强度u进行调控。This paper first introduces two-dimensional materials and their coupling mechanisms. It then investigates the phenomenon of two-dimensional coupled disordered quantum diffusion based on the tight-binding approximation theory. Using both analytical and numerical methods, the study confirms the existence of synchronous quantum diffusion periodic oscillations in the transverse and longitudinal propagation of two-dimensional coupled systems. The results indicate that the periodic oscillations in a bilayer disordered graphene system exhibit greater resilience to disorder compared to a bilayer disordered square lattice system. Periodic oscillations persist in boundary disordered systems across various levels of disorder. When disorder is confined solely to the system’s boundary, the oscillations of Pk(t)and dk(t)commence after the wave packet reaches the boundary, described by yk(t)=0.5±0.5e−t/t0cos(2vt+ϕ). Here, yk(t)can be either Pk(t)or d¯k2(t)and the decay of the function follows the relationship 1/t0~W1.75, indicating a slower decay rate compared to bilayer disordered systems. The decay rate of periodic oscillations in boundary disordered systems transitions from increasing to decreasing as the disorder strength Wvaries. An anomalous quantum diffusion phenomenon is observed, where a larger Wresults in a slower decay rate under strong disorder. Periodic oscillations of quantum diffusion are always present in boundary disordered systems. Research indicates that these periodic oscillations are caused by interlayer
新时代的大学生是未来我们国家的希望,而他们的思想道德会直接影响到当今社会的发展。在如今这个复杂的社会里,由于受到各方面的影响,所以现在的大学生面临着很多新问题。因此,研究新时代大学生的思想道德状况及发展势在必行。本文我们将从新时代大学生的思想特点、新时代大学生思想道德素质的发展现状与特点、当今大学生在思想道德发展方面所存在的问题、如何应对思想道德发展的策略这四个方面进行入手,细致地剖析新时代大学生所应具备的基本道德素质。College students in the new era are the hope of our country in the future, and their ideological and moral will directly affect the development of today’s society. In today’s complex society, due to various influences, college students are faced with many new problems. Therefore, it is imperative to study the ideological and moral conditions and development of college students in the new era. In this article, we will start from the following four aspects: the ideological characteristics of college students in the new era, the development status and characteristics of the ideological and moral qualities of college students in the new era, the problems existing in the ideological and moral development of today’s college students, and how to deal with the strategies for ideological and moral development, and analyze in detail the basic moral qualities that college students in the new era should possess.
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