特征级信息融合方法研究

近几年来,针对多传感器信息融合技术逐渐成为当前研究的热点,该文介绍了信息融合技术的基本概念,引出特征级信息融合的概念,并且根据特征级信息融合技术的特点,给出并分析了几种信息融合方法,最后介绍了信息融合技术的应用情况。     

逆向物流流量不确定闭环供应链鲁棒运作策略设计

考虑一类同时具有再分销、再制造和再利用的闭环供应链在逆向物流流量不确定环境下的运作问题.采用具有已知概率的离散情景描述逆向物流流量的不确定性,利用基于情景分析的鲁棒线性优化方法建立该闭环供应链的多目标运作模型.设计了一个数值算例,其结果验证了运作策略的鲁棒性.在该算例基础上,分析了逆向物流流量的大小对闭环供应链系统运作性能的影响.     

面向对象数据库技术在电子商务中的应用

面向对象（Object—Oriented,OO）数据库系统是数据库与OO技术相结合的产物,作为一种新型的数据库系统,它不仅拥有基本功能,而且支持面向对象的数据模型。本文结合了电子商务系统,阐述了面向对象的数据库。重点研究了面向对象数据库系统在电子商务中的应用,并对其设计思想、软件架构、对象操作及布置等做了较为深入的介绍和技术探讨。     

自适应Notch滤波器四元平面方阵定向性能

为了提高四元平面方阵定向性能,减小其运算量,提出了用自适应Notch滤波器相位差时延估计法进行定向。方法可以动态更新参考信号频率,减小估计方差并实现无偏估计,是实现目标定向的重要途径。与通常所用的互谱法相比,在相位估计方差下界相同时,运算量显著减小。将其应用于四元平面方阵的定向,对水下主动发射信号的回波进行仿真分析,仿真结果表明,在相同的实验条件与精确度下,运算量比通常定向所用的互谱法小,有很强的工程应用价值。     

存储过程在ASP．NET数据库系统开发中的应用

基于ASP．NET的数据库系统开发应用越来越广泛,其中对数据库的操作是一个很重要的内容,而通过调用存储过程实现对数据库的操作是一个很实用的方法。文章将结合企业客户管理系统的开发来介绍存储过程在数据库项目开发中的具体应用。     

Participants matter: Effectiveness of VR-based training on the knowledge,trust in the robot,and self-efficacy of construction workers and university students

Virtual Reality (VR)-based training has gained attention from the scientific community in the Architecture, Engineering, and Construction (AEC) industry as a cost-effective and safe method that eliminates the safety risks that may impose on workers during the training compared to traditional training methods (e.g., in-person hands-on training, apprenticeship). Although researchers have developed VR-based training for construction workers, some have recruited students rather than workers to understand the effect of their VR-based training. However, students are different from construction workers in many ways, which can threaten the validity of such studies. Hence, research is needed to investigate the extent to which the findings of a VR-based training study are contingent on whether students or construction workers were used as the study sample. This paper strives to compare the effectiveness of VR-based training on university students’ and construction workers’ knowledge acquisition, trust in the robot, and robot operation self-efficacy in remote operation of a construction robot. Twenty-five construction workers and twenty-five graduate construction engineering students were recruited to complete a VR-based training for remote operating a demolition robot. We used quantitative analyses to answer our research questions. Our study shows that the results are dependent on the target sample in that students gained more knowledge, whereas construction workers gained more trust in the robot and more self-efficacy in robot operation. These findings suggest that the effectiveness of VR-based training on students may not necessarily associate with its effectiveness on construction workers.     

Bicriteria robotic operation allocation in a flexible manufacturing cell

Consider a manufacturing cell of two identical CNC machines and a material handling robot. Identical parts requesting the completion of a number of operations are to be produced in a cyclic scheduling environment through a flow shop type setting. The existing studies in the literature overlook the flexibility of the CNC machines by assuming that both the allocation of the operations to the machines as well as their respective processing times are fixed. Consequently, the provided results may be either suboptimal or valid under unnecessarily limiting assumptions for a flexible manufacturing cell. The allocations of the operations to the two machines and the processing time of an operation on a machine can be changed by altering the machining conditions of that machine such as the speed and the feed rate in a CNC turning machine. Such flexibilities constitute the point of origin of the current study. The allocation of the operations to the machines and the machining conditions of the machines affect the processing times which, in turn, affect the cycle time. On the other hand, the machining conditions also affect the manufacturing cost. This study is the first to consider a bicriteria model which determines the allocation of the operations to the machines, the processing times of the operations on the machines, and the robot move sequence that jointly minimize the cycle time and the total manufacturing cost. We provide algorithms for the two 1-unit cycles and test their efficiency in terms of the solution quality and the computation time by a wide range of experiments on varying design parameters.     

事件运算、事件表达式与主动数据库技术研究

主动数据库系统的主动性源于事件的发生,完整准确地表达事件,是建立事件规则库和事件“监视器”高效工作的关键。该文从事件入手,讨论事件运算规则、事件表达式的构造方法和“事件-条件-动作”（ECA）规则的描述格式。     

仿真技术在装备维修规划中的应用研究

该文应用系统仿真的方法研究了战场武器装备损坏的修理情况。根据实战和训练记录数据资料,研究分析得出了武器战场损坏修理时间服从对数正态分布的规律。用SIMAN仿真语言建立了仿真模型并进行仿真运行实验。这些分析研究结果对于有效组织战损装备抢修,提高武器装备的使用效率有实际应用价值和重要意义。     

有线数字电视综合业务支撑系统的建设研究

依据有线电视行业信息系统建设现状的分析,理论结合实际,提出有线数字电视综合业务支撑系统的建设思路：参考SAM模型进行IT战略与企业战略的整合,根据MBOSS技术架构设计了适合有线数字电视业务的综合业务系统架构,通过业务流程再造进行组织结构和业务流程的重新梳理,统一规划,分步实施：通过这些思路,提出合理、可行的有线数字电视综合业务支撑系统的建设建议,从而增强企业的核心竞争力,推动有线数字电视业务的健康发展？