摘要：针对视频输入的单人三维人体姿态估计中表征不精确、融合不充分、结果不平滑的问题,提出三维人体姿态估计的多尺度时空特征融合方法.首先在空域定义关节点、肢体和上/下身人体标记并通过位置嵌入表示人体的空间多尺度特征;然后结合自注意力机制和多层感知机构建空间多尺度特征融合模块,融合关节点、肢体和上/下身三个空间多尺度特征,得到初步姿态特征序列;最后建立时序多尺度编码进行时序特征融合获得最终姿态特征序列,并通过时序解码,优化生成细化的三维人体姿态.在Human3.6M数据集上的实验结果表明,所提方法的平均每关节位置P-MPJPE和速度误差MPJVE分别为33.6和2.4,较对比方法降低了2.3%和4.0%,能够降低计算复杂度,提高三维人体姿态估计精度,生成准确、平滑的三维人体姿态估计结果.此外,在HumanEva-I数据集的测试结果表明,所提方法也具有一定的泛化性.

摘要：Stem cells are cells that can self-renew and differentiate. Conceptually, stem cells should be able to generate all functional cells that are required for cell therapy and tissue en- gineering. Although naturally existing stem cells can be harvested from different parts of the body through various developmental stages, the technical difficulties in obtaining, maintaining and differentiating stem cells hindered the progress of stem cell application in regenerative medicine. In 2006, Yamanaka et al.

摘要：Direct adaptive fuzzy sliding mode control design for discrete non-affine nonlinear systems is presented for trajectory tracking problems with disturbance. To obtain adaptiveness and eliminate chattering of sliding mode control, a dynamic fuzzy logical system is used to implement an equivalent control, in which the parameters are self-tuned online. Stability of the sliding mode control is validated using the Lyapunov analysis theory. The overall system is adaptive, asymptotically stable, and chattering-free. A numerical simulation and an application to a robotic arm with two degrees of freedom further verify the good performance of the control design.

摘要：Atomic blocks, a high-level language construct that allows programmers to explicitly specify the atomicity of operations without worrying about the implementations, are a promising approach that simplifies concurrent programming. On the other hand, temporal logic is a successful model in logic programming and concurrency verification, but none of existing temporal programming models supports concurrent programming with atomic blocks yet. In this paper, we propose a temporal programming model （αPTL） which extends the projection temporal logic （PTL） to support concurrent programming with atomic blocks. The novel construct that formulates atomic execution of code blocks, which we call atomic interval formulas, is always interpreted over two consecutive states, with the internal states of the block being abstracted away. We show that the framing mechanism in projection temporal logic also works in the new model, which consequently supports our development of an executive language. The language supports concurrency by introducing a loose interleaving semantics which tracks only the mutual exclusion between atomic blocks. We demonstrate the usage of αPTL by modeling and verifying both the fine-grained and coarse-grained concurrency.

摘要：AIM： To compare clinical results between toric and spherical periphery design orthokeratology（ortho-k） in myopic children with moderate-to-high corneal astigmatism. METHODS： This retrospective study enrolled 62 eyes of 62 subjects using toric ortho-k lenses. These subjects were assigned to the toric group. Based on the one-to-one match principle（same age, proximate spherical equivalence and corneal astigmatism）, 62 eyes of 62 subjects were enrolled and included in the spherical group. At one-year followup visit, visual acuity, corneal astigmatism, treatment zone decentration, axial elongation and adverse reaction were compared between these two groups. RESULTS： At the one-year visit, corneal astigmatism was significantly lower in the toric group（1.22±0.76 D） than in the spherical group（2.05±0.85 D）（P=0.012）. The mean magnitude of the treatment zone decentration was 0.62±0.42 mm in the toric group and 1.07±0.40 mm in the spherical group（P=0.004）. Axial elongation was significantly slower in the toric group（0.04±0.13 mm） than in the spherical group（0.09±0.13 mm）（P=0.001）. The oneyear axial elongation was significantly correlated with initial age（r=-0.487, P〈0.001） and periphery design of ortho-k lens（r=0.315, P〈0.001）. The incidence of corneal staining was lower in the toric group（8.1%） than in the spherical group（19.4%）（P〈0.001）. CONCLUSION： Toric periphery design ortho-k lenses may provide lower corneal astigmatism, better centration, slower axial elongation and lower incidence of corneal staining in myopic children with moderate-to-high corneal astigmatism.

摘要：近年来,随着互联网及智能移动设备的发展和普及,丰富了广告的推送方式和投放平台.但是传统的广告推送无法满足用户对个性化广告的需求,导致用户对广告产生抵触情绪,给广告推送带来极大的挑战.个性化广告推荐系统作为应对这些挑战的有效手段,成为个性化服务领域的研究热点之一.个性化广告推荐系统获取用户兴趣偏好,利用多种个性化广告推荐技术,通过PC端、移动终端等多平台为用户提供个性化广告,并且已经在一些应用系统中取得不错的效果.本文对个性化广告推荐系统的研究进展进行系统地综述,从个性化广告推荐的概述出发,对近年来个性化广告推荐的关键技术进行深入分析,包括数据采集与预处理、用户偏好获取、个性化广告推荐技术等.统计分析了个性化广告推荐中使用的多种数据集和评价指标,总结当前个性化广告推荐在传统互联网、移动服务、数字标牌、IPTV等场景下的应用.最后对个性化广告推荐系统存在问题和未来深入研究的方向进行讨论和展望.

摘要：In this paper, we present a modified projection method for the linear feasibility problems （LFP）. Compared with the existing methods, the new method adopts a surrogate technique to obtain new iteration instead of the line search procedure with fixed stepsize. For the new method, we first show its global convergence under the condition that the solution set is nonempty, and then establish its linear convergence rate. Preliminary numerical experiments show that this method has good performance.

摘要：文化建设是动漫角色品牌建设的根基,动漫角色品牌建设是推动动漫产业的重要途径。本文分别通过对动漫角色品牌的定义、朱子文化动漫角色品牌的现状、朱子文化动漫角色品牌的建设与推广进行阐述。探讨将动漫艺术与朱子文化相结合,打造朱子文化动漫角色品牌,推动闽北动漫产业的发展,传承与推广朱子文化。

摘要：Cobalt oxides, such as C0304 and CoO, have received increasing attention as potential anode materials for rechargeable lithium-ion batteries （LIBs） owing to their high theoretical capacity. Nanostructure engineering has been demonstrated as an effective approach to improve the electrochemical performance of electrode materials for LIBs. In this review, we summarize recent developments in the rational design and fabrication of various cobalt oxide-based nanomaterials and their lithium storage performance, including 1D nanowires/belts, 2D nanosheets, 3D hollow/hierarchical structures, hybrid nanostructures with carbon （amorphous carbon, carbon nanotubes and graphene） and mixed metal oxides. By focusing on the effects of their structure on their electrochemical performance, effective strategies for the fabrication of cobalt oxide/carbon hybrid nanostructures are highlighted. This review shows that by rational design, such cobalt-oxide-based nanornaterials are very promising as next generation LIB anodes.

摘要：以重庆市某大型娱乐中心项目为例,探讨了膜结构的热物理性能及其对室内舒适性和能耗的影响。项目采用PTFE(聚四氟乙烯)和ETFE(乙烯-四氟乙烯共聚物)2种膜材料,通过建模分析比较了不同太阳得热系数的膜材料对室内温度、辐射和舒适性的影响。结果表明,ETFE膜的高透光性有利于室内采光,但同时也增加了夏季太阳辐射对室内热舒适性的影响。为平衡室内舒适性与节能需求,结合项目特征,本研究提出了一种分层空调方案。通过模拟分析,该方案能有效提高室内舒适性并降低能耗。研究结果可为类似膜结构高大娱乐中心项目的暖通空调设计提供参考。