基于最佳燃油经济性的换挡指导系统

针对驾驶员不良换挡习惯造成明显燃油浪费的现状,提出了一套基于最佳燃油经济性的换挡指导系统,其基本原理是通过汽车OBD-Ⅱ接口读取车辆状态参数,然后依据最优换挡理论,在恰当的时机提醒驾驶员换挡.对系统的设计与实现进行了详细说明,主要包括系统框架、缺失参数的识别算法、最佳换挡的判别算法.最后对系统进行有效性验证,结果表明应用该系统平均节油8.6%,并且能使油耗水平更加稳定.研究成果可在现实中进一步推广,对交通领域节能减排有重要的价值.     

光纤陀螺随机误差特性ThêoH辨识

随机误差特性分析是光纤陀螺进入工程应用阶段的关键技术.针对Allan方差、总方差、Thêo1 (Theoretical variance #1)等分析方法的不足,以Thêo1为基础,通过偏差消除获得ThêoBR(Bias-removed ver?sion of Thêo1),并将其与Allan方差合成,得到光纤陀螺随机误差特性分析的ThêoH(Hybrid-ThêoBR)法.通过计算重叠Allan方差、总方差、Thêo1以及ThêoH的等效自由度,结合仿真和实测信号的随机误差特性分析实验,证明ThêoH法不仅提高了Allan方差估计的置信度,且解决了Thêo1估计有偏的问题,表明了该方法是目前能够有效辨识光纤陀螺随机误差特性的最佳方法.     

基于粒子群蚁群算法的供应链合作伙伴选择研究

针对供应链合作伙伴选择的准确性和效率问题,提出一种基于粒子群和蚁群优化的合作伙伴选择算法。建立基于供应链链节体和连接弧的有向图路径模型,构造多目标规划模型。利用改进的离散型粒子群算法,求取伙伴选择问题的初始解集,构建初始信息素矩阵,通过改进蚁群算法的寻径规则,求取供应链合作伙伴选择问题的最优解。实验结果表明,所提算法有效提高了供应链合作伙伴选择的精度和效率,具有较好的性能。     

Yang–Baxter equations and quantum entanglements

In this paper some results associated with a new type of Yang–Baxter equation (YBE) are reviewed. The braiding matrix of Kauffman–Lomonaco has been extended to the solution (called type-II) of Yang–Baxter equation (YBE) and the related chain Hamiltonian is given. The Lorentz additivity for spectral parameters is found, rather than the Galilean rule for the familiar solutions (called type-I) of YBE associated with the usually exact solvable models. Based on the topological basis, the N-dimensional solution of YBE is found to be the Wigner D-functions. The explicit examples for spin-\(\frac{1}{2}\) and spin-1 have been shown. The extremes of \(\ell _1\)-norm of \(D\)-functions are introduced to distinguish the type-I from type-II of braiding matrices that also correspond to those of von Neumann entropy for quantum information.     

Protection of quantum correlations against decoherence

The protection of different quantum correlations, such as Bell nonlocality, quantum discord, and geometric quantum discord as trace distance against noise, is explored. By weak measurement and quantum measurement reversal, we show that the mentioned quantum correlations can be effectively preserved probabilistically from the decoherence due to amplitude damping. The results will play an important role in the experiments using the quantum correlations as resource.     

Pseudo-inversion: closure properties and decidability

We consider a pseudo-inversion operation inspired by biological events, such as DNA sequence transformations, where only parts of a string are reversed. We define the pseudo-inversion of a string \(w = uxv\) to be the set of all strings \(v^Rxu^R\), where \(uv \ne \lambda \) and consider the operation from a formal language theoretic viewpoint. We show that regular languages are closed under the pseudo-inversion operation whereas context-free languages are not. Furthermore, we study the iterated pseudo-inversion operation and show that the iterated pseudo-inversion of a context-free language is recognized by a nondeterministic reversal-bounded multicounter machine. Finally, we introduce the notion of pseudo-inversion-freeness and examine closure properties and decidability problems for regular and context-free languages. We demonstrate that pseudo-inversion-freeness is decidable in polynomial time for regular languages and undecidable for context-free languages.     

基于块稀疏快速重构的MISO活跃用户集与信道联合估计

针对多用户多输入单输出（Multiple input single output, MISO)系统的用户选择与信道估计问题,引入基于用户分布式自选择的信道接入策略,设计一种新的结合该策略的时分双分复用（Time division duplex, TDD)模式数据传输帧结构。利用用户活跃模式自然稀疏性和信道冲激响应时延域稀疏性,将基站接收上行随机导频序列建模为块稀疏线性模型。基于凸松弛的l2/l1模型提出一种快速的块稀疏重构算法求解问题模型。算法首先对目标函数进行变量分裂,然后利用交替方向法对各变量进行交替更新,直至满足收敛条件。交替更新中,对于无法获得闭式解的信号变量项,采取块坐标下降法求解。计算机仿真表明,与块正交匹配追踪和块压缩采样匹配追踪比较,新算法能够在保持高重构精度的前提下获得更快的计算速度。     

Quantification model of proper curvature for large‐sized curved TVs

We present a feasible modeling method to estimate the proper curvature for large‐sized curved TVs. We especially focused on two factors – preference and perceived distortion – to be considered to determine the proper curvature. The preference includes a number of advantages that people expect to fulfill the possibilities of a more immersive image and sense of realism from curved display. On the other hand, the perceived distortion means the side effects that people can notice uncomfortable feeling caused by the shape of a curved one. In order to find out how two factors would be different as a number of conditions like curvature, size, and viewing angle change, a series of subjective assessments were conducted. The evaluation results show that both the preference and perceived distortion vary with the conditions considerably. We performed the statistical analysis based on the results and proposed the quantification model of proper curvature, which has higher preference and less perceived distortion, for various‐sized curved TVs.     

加压液化输沙技术与“浑水水力分离清水装置”结合的实验研究

本文通过物理模型实验的研究方法,通过不同含沙浓度的浑水,以不同进流流量的工况下,所得的清水溢流流量的汇总,拟合得出一定含沙浓度浑水不同进流流量时,清水溢流出口的计算公式。为工程使用中,初步确定装置的尺寸与工作工况提供参考。