多通道温度测量整体校准系统仿真分析

为了实现低温风洞等设备高精度温度场测量目的 ,需要综合考虑温度传感器、连接电缆、调理放大器、数据采集系统以及环境等各种因素产生的综合误差,设计一套在低温范围内对温度测量系统进行整体全回路原位校准装置;针对整体全回路原位校准装置在准度、温度场均匀性、温度场稳定性等各方面的高精度要求,在装置方案设计完成后,对其核心部分隔热校准腔进行了热力学仿真计算,对其主体三层结构型式、绝热技术、引线密封方式、温度场均匀性保证措施等进行了模拟计算,并建立了实验平台对仿真结果进行了实际验证和方案优化;仿真和实验验证结果证明,低温温度测量系统整体校准装置所采用的设计方案能够满足一次校准通道数11路和在77～323 K温度范围内温度准度50 mK、有效温度场均匀性50 mK等技术指标要求.     

基于混合神经网络的实体关系抽取方法研究

实体关系抽取是信息抽取领域的重要研究内容,对知识库的自动构建起着至关重要的作用。针对非结构化文本实体关系抽取存在上下文环境信息难以准确表征,致使现有抽取模型准确率不能满足实际应用需求的问题,该文提出了一种新型的实体关系抽取模型BiGRU-Att-PCNN。该模型是基于混合神经网络,首先,构建双向门控循环单元(BiGRU)以更好地获取文本序列中的上下文语序的相关信息;然后,采用注意力(Attention)机制来达到自动关注对关系影响力高的序列特征的目的;最后,通过采用分段卷积神经网络(PCNN),从调整后的序列中较好地学习到了相关的环境特征信息来进行关系抽取。该模型在公开的英文数据集SemEval 2010 Task 8上取得了86.71%的F₁值,实验表明,该方法表现出了较好的性能,为信息抽取领域实体关系的自动获取提供了新的方法支持。     

造价咨询职业保险制度的建立及可行性分析

建立工程造价咨询职业保险制度是完善工程造价咨询市场管理制度的重要配套措施.从政治环境、技术环境、经济环境以及风险可保性4个方面阐述并论证了建立造价咨询责任保险制度的可行性,并提出着重从建立造价咨询企业绩效评价与动态费率、咨询行业风险与保险赔偿的对接制度、组建注册造价工程师责任鉴定委员会等方面构建工程造价咨询职业保险制度.     

面向对象过程仿真技术中的资源规划

过程仿真是企业过程模型进行分析、验证、改进、优化和评价的实用方法。尤其在过程模型难以定量优化的情况下,过程仿真就显得更为重要。侧重于过程仿真中的资源规划问题。对过程仿真中的资源类进行定义,并描述了资源与组织、资源与功能之间的关系;在此基础上对过程仿真中的资源规划进行研究。     

支持BPR的面向对象资源建模技术

资源优化是BPR提高企业整体效的重要内容,提出了面向对象资源模技术BPR对资源的优化设计,并通过在一种企业建模体系的集成开发环境下的具体应用证明了此建模技术的实用性和有效性。     

改进黑猩猩优化算法的测试数据生成研究

自动生成测试数据的关键在于能否生成覆盖率高、纠错能力强的数据。针对目前测试数据生成效率低及黑猩猩优化算法仍存在易陷入局部最优、收敛精度低等问题,提出一种正余弦扰动策略黑猩猩优化算法（chimp optimization algorithm for sine-cosine perturbation strategy,SC-ChOA）。使用拉丁超立方策略初始化种群,增强种群的多样化;引入非线性衰减收敛因子来平衡算法的全局和局部勘探能力;在位置更新时添加正余弦扰动因子,避免群体陷入局部范围搜索而导致的算法停滞现象。使用测试函数与标准黑猩猩优化算法及常用的遗传算法进行对比实验,验证算法的有效性;将改进算法应用到测试数据生成领域,通过在桩中插入分支函数来建立适应度函数,以促进测试数据的优化。为验证改进算法在测试数据生成方面的有效性,使用多个基准程序进行算法对比实验,结果表明SC-ChOA在测试数据生成的覆盖率、平均迭代次数和运行时间上均有明显优势。     

Self‐Assembling of Conductive Interlayer‐Expanded WS2 Nanosheets into 3D Hollow Hierarchical Microflower Bud Hybrids for Fast and Stable Sodium Storage

Transition‐metal dichalcogenides have emerged as promising anodes of sodium ion batteries (SIBs). Their practical SIB application calls for an easy‐to‐handle synthetic technique capable of fabricating favorable properties with high conductivity and stable structure. Here, a solvothermal strategy is reported for bottom‐up self‐assembling of nanoflowers' building block, i.e., conductive interlayer‐expanded 2D WS₂ nanosheets thanks to in situ interlayer modification by nitrogen‐doped carbon matrix, into 3D hollow microflower bud‐like hybrids (H‐WS₂@NC). The 3D nano/microhierarchical hollow structures are constructed by conductive interlayer‐expanded WS₂ nanosheets' building blocks, providing abundant channels facilitating mass transport/electrons transfer, robust protection layer to avoid the direct contact between WS₂ nanosheets and electrolyte, sufficient inner space for accommodating volume variation, and decreased ions diffusion energy barrier for accelerating electrochemical kinetics, as revealed by density functional theory calculations. As such, the 3D H‐WS₂@NC hybrids exhibit quite attractive sodium storage performance with high reversible capacity, superior rate capability, and impressively long cycling life. The 3D H‐WS₂@NC is further verified as anode of sodium‐ion full cell pairing with Na₃V₂(PO4)₃/rGO cathode, delivering a stable reversible capacity of 296 mAh g^?1 at 0.5 A g^?1 with high energy density of 128 Wh kg^?1_total at a power density of 386 W kg^?1_total.     

A decision support system for substage-zoning filling design of rock-fill dams based on particle swarm optimization

In this paper, we studied a substage-zoning filling design problem, which is considered as a complex problem with numerous tasks such as construction planning, dam access road and borrow placement, workspace filling, and construction project management. In analyzing workflows and the mechanism of substage-zoning filling, not only the above-mentioned tasks are considered, but also the environmental factors such as rainfall and hydrology characteristic temperature are taken into account. In this study, an optimization model for dam filling which aimed at reducing the disequilibrium degree of filling intensity was proposed; in addition, a technique based on particle swarm optimization was introduced as the basis of a decision support system for rock-fill dams. The system has been employed in a water conservancy and hydropower project which shows that the system is able to provide quality decision support and facilitate the rock-fill dam construction effectively.     

利用三层条件随机场模型进行情感极性分类及强度分析

通过对商品评论进行基于方面的情感分析,可以得到某件商品各个方面的优劣情况。本文提出利用三层CRFs模型进行情感极性分类及强度分析。在CRFs模型中,融合了词、词性、语气词、程度词、方面和评价词的共现等特征。在情感句识别、情感极性分类和情感强度分析上得到的F1值分别为86.3%、77.2%、70.7%,证明了：(1)分层CRFs模型在各个层次的任务中都能取得较好的结果;(2) 语气词、程度词、方面和评价词的共现特征在情感分类时是的有效性。     

Distributed guaranteed cost control for aperiodic sampled-data networked interconnected systems: a switched system approach

This paper investigates the distributed guaranteed cost control problem for a class of networked interconnected control systems (NICSs) under aperiodic sampling. The NICSs with missing data and time-varying delay are modelled as an aperiodic sampled-data switched system with uncertainties. Then, sufficient conditions ensuring the exponential stability and guaranteed cost quadratic performance are presented by using the average dwell time approach. The distributed state feedback controller is designed by solving a set of LMIs. Finally, a simulation example is given to verify the effectiveness of the proposed method.