摘要：化学取代是有效调节分子电导,产生多通道输运、量子干涉效应和其他机制的关键方法.但分子骨架和侧基之间存在复杂的相互作用,目前仍未被研究清楚.在本工作中,我们结合扫描隧道显微镜裂结实验技术和第一性原理计算方法,深入研究了具有不同σ和π侧基的分子电导.实验结果及理论分析表明,σ侧基的加入引起了分子前线轨道的对称性破缺并加剧了分子内散射,从而导致电导的降低.相反,π侧基引入了额外的电荷传输通道,实现了电荷传输的多通道效应,增加了分子的电导.这些发现为未来分子功能化和分子电子器件的设计提供了坚实的基础.

摘要：1 Introduction—starting at noetic science One question that has long puzzled the artificial intelligence(Al)community is:Can Al be creative?Or,can the reasoning process be creative?Starting at noetic science,this paper discusses the issues of visual knowledge representation and its potential applications to machine *** this paper,we enumerate related research on imagery-thinking-based reasoning,then focus on a special type of visual knowledge representation,i.e.,visual scene graph,and finally review the problem of visual scene graph construction and its potential applications in detail.

摘要：Dunhuang murals are gems of Chinese traditional art. This paper demonstrates a simple, yet powerful method to automatically identify the aesthetic visual style that lies in Dunhuang murals. Based on the art knowledge on Dunhuang murals, the method explicitly predicts some of possible image attributes that a human might use to understand the aesthetic visual style of a mural. These cues fall into three broad types: ① composition attributes related to mural layout or configuration; ② color attributes related to color types depicted; ③ brightness attributes related to bright conditions. We show that a classifier trained on these attributes can provide an efficient way to predict the aesthetic visual style of Dunhuang murals.

摘要：There are a lot of security issues in block cipher *** analysis and enhanced design of a dynamic block cipher was ***,the safety of ciphertext was enhanced based on confusion substitution of S-box,thus disordering the internal structure of data blocks by four steps of matrix ***,the diffusivity of ciphertext was obtained by cyclic displacement of bytes using column ambiguity *** dynamic key was finally generated by using LFSR,which improved the stochastic characters of secret key in each of round of *** safety performance of proposed algorithm was analyzed by simulation *** results showed the proposed algorithm has a little effect on the speed of encryption and decryption while enhancing the ***,the proposed algorithm has highly scalability,the dimension of S-box and the number of register can be dynamically extended according to the security requirement.

摘要：我们将实体嵌入问题看作同时完成两个不同但相关的嵌入任务(实体嵌入和关系嵌入)的联合优化问题,并在联合嵌入框架下求解该问题。在该嵌入框架下,我们设计了联合评分函数,用以对实体和关系间的相关性实例进行量化评价,并将评分函数融入最大间隔学习方法中,使用知识库中的上下文信息学习实体与关系的嵌入向量。通过求解联合优化问题,我们的设计有效地表达了嵌入空间的固有拓扑结构。实验结果证实了我们的嵌入框架在表达不同关系的语义相关性和进行知识推理中的关系预测时的有效性。

摘要：Formal verification is playing a significant role in IC ***,the common models for verification either have their complexity problems or have applicable *** order to overcome the deficiencies,a novel model-WGL(Weighted Generalized List)is proposed,which is based on the general-list decomposition of polynomials,with three different weights and manipulation rules introduced to effect node sharing and the *** parameters and operations on them are also *** show the word-level WGL is the only model to linearly represent the common word-level functions and the bit-level WGL is especially suitable for arithmetic intensive *** model is proved to be a uniform and efficient model for both bit-level and word-level *** based on the WGL model,a backward-construction verification approach is proposed,which reduces time and space complexity for multipliers to polynomial complexity(time complexity is less than O(n3.6)and space complexity is less than O(n1.5))without hierarchical *** the model and the verification method show their theoretical and applicable significance in IC design.

摘要：本文提出一种在特殊任务下基于Chebychev映射的移动机器人混沌全覆盖路径规划器的设计新策略。所设计的混沌路径规划器包含一个二维的Chebychev映射,该映射由两个一维的Chebychev映射构建而成。对规划器所产生的时间序列,进行反正弦变换,可以改善系统的混沌特性和均匀分布特性,从而提高机器人在完成特殊任务时的覆盖率和随机特性。通过仿射变换,Chebychev混沌系统映射到机器人工作空间的可行区域内,然后设计有障碍物环境下全覆盖路径规划的通用方法。仿真结果显示,所设计的混沌路径规划器在可行空间能够安全运行,不需要设计避障算法。所设计策略能够满足特殊任务下随机性、遍历性和高效率的需求。

摘要：We propose a configurable surface-electrode ion trap design to alleviate the poor reusability of the existing *** can architecturally and electrically support 5 mainstream modes by design reuse,thus enhancing the trap reusability and reducing the experiment setup *** also develop a corresponding simulation suite which can optimize trap geometries and calculate trap parameters to control the trapped ion's classic *** to our analytical and simulated results,the configurable design can serve as a unified platform for basic research of large-scale quantum information processing.

摘要：目的:为提供持续性的按需服务,移动云计算系统必须确保在任何时间和任何地点的可用性。然而当系统规模巨大、关联关系复杂时,如何实现移动云计算系统可用性的快速分析,是本领域一项富有挑战性的工作。本文目的是利用最近提出的流近似(fluid-flow approximation)技术来实现一种能应用于移动云计算系统部署之前的、快速的服务可用性分析方法。创新点:由于移动云计算系统负载水平不同、配置部署不同和随机干扰因素,基于实测的方法很难具有代表性;基于随机模拟的方法会随着模拟规模增大和精度提升而计算时间剧增;基于状态空间的方法在系统规模巨大时将面临严重的状态空间爆炸问题。本文方法通过将状态空间转化为常微分方程组求解,可以避免状态空间爆炸,实现移动云计算系统可用性的快速分析。方法:定义了包括服务反应时间(response time of service)、节点最小感知时间(minimum sensing time of devices)、最少选取节点数量(minimum number of nodes chosen)、动作吞吐量(action throughput)等四个关键指标。通过上述指标来分析移动云计算系统服务可用性的变化,并对系统初始条件、模型核心参数的影响进行讨论。结论:本文提出的服务可用性分析方法能够适用于移动云计算系统完全部署之前,可以用于系统设计阶段的改进。并且与基于随机模拟方法和状态空间方法相比,时耗更低。

摘要：An accurate and rapid method is proposed to optimize anharmonie linear surface-electrode ion trap design. Based on the method, we analyze the impact of the architectural parameters, including the width, number, and applied voltage of prerequisite active electrodes, on the number and spacing of trapped ions. Sets of optimal anharmonic trap design are given. Then the optimal designs are verified by using an ant colony optimization algorithm. The results show that the maximum ion position errors and maximum ion spacing errors are less than 1 μm up to 80. The mean of the maximum errors is nearly linear with respect to the number of trapped ions.