基于可拓结构化模型的输变电工程项目质量管理研究

为解决当前输变电工程项目质量管理水平偏低,管理方法存在缺陷,导致项目中潜在的安全风险与安全隐患较多,不利于输变电工程项目高效、稳定建设与发展的问题,引入可拓结构化模型,开展了输变电工程项目质量管理的研究。通过构建项目质量管理要素结构化模型、可拓分析项目质量、设计以质量控制为目标的管理流程,提出了一种新的质量管理方法。通过对比分析可知,新的工程项目质量管理方法,其各个质量单位的等级评价结果均高于传统方法,整体的质量管理效果得到了显著提升。

移动运输机器人结构可拓设计创意生成研究

在移动运输机器人(Mobile Transport Robot,MTR)的创新设计过程中,为使其结构满足用户的需要,结合机器人设计领域知识,利用可拓创新方法对MTR的结构进行了形式化及逻辑化研究,提出了从用户的需要事元映射到MTR的功能事元,再由功能事元映射到结构关系元的结构可拓设计创意生成方法。在评选较优结构创意时,结合ROS仿真技术,为MTR的结构设计提供了便利且高效的筛选方法。将可拓创新方法和ROS仿真相结合,可提高企业机器人产品的开发效率。

自动化立体仓库穿梭式货架的结构可拓设计

在自动化立体仓库的结构设计中,为增加结构设计的多样性和新颖性,本文将可拓创新方法应用于穿梭式货架的结构设计,并给出其结构可拓设计的一般流程。根据用户需求和原始资料,建立穿梭式货架的可拓模型。分析其功能事元、部件物元、连接关系元间的映射关系,建立功能事元集的蕴含系;建立自动化立体仓库货架结构设计的相关分析网,对其进行拓展分析并实施相应的主动变换,进而获得自动化立体仓库结构设计的创意策略集;选取的最优策略已应用于企业生产,具有较好的实用性。

供应链管理在会展经济中的应用研究

本文探讨了会展经济中供应链管理的重要性及数字化与智能化升级对其发展的影响。首先,分析了会展经济的信息场特点和系统可拓结构,强调了供需信息链与客户驱动信息链在会展经济中的关键作用;其次,讨论了智慧供应链的发展,包括人工智能、大数据分析在预测需求、优化展会布局及信息系统集成中的应用;最后,强调了数字化与智能化升级在会展经济中的关键作用,特别是人工智能技术的应用对智能决策和自动化流程优化的创新应用。希望本研究能为我国会展经济的进一步发展提供有益参考与启示。

基于结构可拓模型的产品结构方案再设计方法

针对产品结构设计要素之间存在非功能作用且作用关系形式不统一、不易识别、表达拓展性差等问题,提出了基于结构可拓模型的产品结构方案再设计方法。考虑非功能作用与结构的关联关系,基于可拓理论提出产品结构基元概念,即实体元、交互元、可供性元,并基于此构建产品结构可拓模型,用于表达产品结构设计要素及作用关系。借助需求—可供性—交互关系—结构多个设计域映射机制,通过需求—可供性映射挖掘产品待改进可供性,通过可供性—交互关系—结构映射确定产品待改进结构。对可供性元进行拓展分析得到产品可行结构方案集。采用优度评价法选取最优结构方案。给出结构可拓变换规则,实现产品结构再设计方案。最后以跟腱康复装置再设计为例,验证了所提出方法的可行性和有效性。

An efficient reliability evaluation method for industrial wireless sensor networks

Aimed at the difficulties in accurately, comprehensively and systematically evaluating the reliability of industrial wireless sensor networks （WSNs）, a time-evolving state transition-Monte Carlo （TEST-MC） evaluation method and a novel network function value representation method are proposed to evaluate the reliability of the IWSNs. First, the adjacency matrix method is used to characterize three typical topologies of WSNs including the mesh network, tree network and ribbon network. Secondly, the network function value method is used to evaluate the network connectivity, and the TEST-MC evaluation method is used to evaluate network reliability and availability. Finally, the variations in the reliability, connectivity and availability of these three topologies are presented. Simulation results show that the proposed method can quickly analyze the reliability of the networks containing typical WSN topologies, which provides an effective method for the comprehensive and accurate evaluation of the reliability of WSNs.

Calculation connectivity reliability of road networks based on recursive decomposition arithmetic

In order to decrease the calculation complexity of connectivity reliability of road networks, an improved recursive decomposition arithmetic is proposed. First, the basic theory of recursive decomposition arithmetic is reviewed. Then the characteristics of road networks, which are different from general networks, are analyzed. Under this condition, an improved recursive decomposition arithmetic is put forward which fits road networks better. Furthermore, detailed calculation steps are presented which are convenient for the computer, and the advantage of the approximate arithmetic is analyzed based on this improved arithmetic. This improved recursive decomposition arithmetic directly produces disjoint minipaths and avoids the non-polynomial increasing problems. And because the characteristics of road networks are considered, this arithmetic is greatly simplified. Finally, an example is given to prove its validity.

Research on Visualization of Long-staple Cotton Growth in Southern Xinjiang

Base on the related researches at home and abroad, using systematic analysis principle mathematical modeling techniques, analysis model of organ collection properties, root structure model, mechanism model of spatial form of organs and dynamic model of plant topological structure in line with the growth of long-staple cotton are constructed, and three-dimensional dynamic simulation of long-staple cotton in southern Xinjiang is finally achieved. The system can promote people＇s understanding and perception on growth process of long-staple cotton in southern Xinjiang, which provides support for analysis of relationship between structure and function of long-staple cotton, design of ideal plant and regulation of growth model.

The Extension Methods and Fecision-making Analysis on the Planting Dtructure of Dlope Garmland in Northern Shaanxi

Based on the resent research about the planting structure of slope farmland in northern Shaanxi,in order to increase the native's income,we use the theory of the extension methods to analyze the planting structure of slope farmland,so that we can get the extensive strategy,and put them into use for planting of slope farmland to make the native's income higher.

Properties of Bottleneck on Complex Networks

The traffic bottleneck plays a key role in most of the natural and artificial network. Here we present a simply model for bottleneck dynamical characteristics consideration the reliability on the complex network by taking into account the network topology characteristics and system size. We find that there is a critical rate of flow generation below which the network traffic is free but above which traffic congestion occurs. Also, it is found that random networks have larger critical flow generating rate than scale free ones. Analytical results may be practically useful for designing networks, especially for the urban traffic network.

Study on the Reversible DC-DC Converter as Interface between Low and Medium Voltage DC Networks

This paper introduces an isolated reversible DC-DC converter with a particular topology, which benefits from both the NPC （neutral point clamped） structure and the series-parallel connection of converters. The key property of the proposed topology is the output voltage elevation above the blocking capabilities of each switch, without taking to a delicate synchronization of series-connected semiconductors. The converter is composed by two identical cells, each containing a full bridge, a medium frequency transformer and an NPC converter, connected in parallel at the input and in series at the output. The operation principle of each cell, into which a trapezoidal modulation was implemented, is similar to a DAB （dual active bridge）. A new model improves the dynamic performance of the controller. Simulation and experimental results verify the proposed topology, its control and start-up strategy.

Algebraic algorithm for reliability index weighted capacity of communication network

Communication network has communication capacity and connection reliability of the links. They canbe independently defined and can be used separately, and when the reliability of a communication network isanalyzed from a macroscopical angle of view, it is more objective to express the performance index of a commu-nication network as a whole. The reliability index weighted capacity is just obtained by integrating these two pa-rameters. It is necessary to further study the algorithm to calculate the reliability index of the communicationnetwork with a complicated topologic structure and a whole algebraic algorithm is therefore proposed for calcula-tion of the reliability index weighted capacity of a communication network with a topologic structure. The wholecomputational procedure of the algorithm is illustrated with a typical example.

Relay switched, scalable topology control for mobile robot networks based on motion synchronization

A mobile robot network is said to be easily scalable to any number of robots if its performance is kept almost fixed after these robots are added or some fail in the network. An interaction dynamics model based on motion synchronization is first established. Considering the mobility of mobile robot networks, we propose a relay switched, distributed topology control for the scalable network to drive neMy added robots to the most suitable positions with more neighbors as well as self-heal the blank positions of failed robots, and give a metric of the topology structure for evaluating the performance of network topologies. Then, we prove the stability of motion synchronization with the individual control based on Lyapunov exponent. Finally, the results of simulations have demonstrated the validity of the proposed modeling and control methods.

A New Topology of a Variable Output-Voltage DC-DC Converter for Fuel Cell Vehicles

The aim of this paper is to present a new topology of a DC-DC power converter for conditioning the current and voltages behaviors of embarked energy sources used in electrical vehicles. The fuel cells in conjunction with ultra-capacitors have been chosen as the power supply. The originality of the proposed converter is to use a variable voltage of the DC bus of the vehicle. The goal is to allow a better energy management of the embedded sources onboard the vehicle by improving its energy efficiency. After presenting and explaining the topology of the converter, some simulation and experiments results are shown to highlight its different operation modes.

Reliability and Efficiency of Generalized Rumor Spreading Model on Complex Social Networks

We introduce the generalized rumor spreading model and investigate some properties of this model on different complex social networks. Despite pervious rumor models that both the spreader-spreader (SS) and the spreader-stifler (SR) interactions have the same rate α, we define α(1) and α(2) for SS and SR interactions, respectively. The effect of variation of α(1) and α(2) on the final density of stiflers is investigated. Furthermore, the influence of the topological structure of the network in rumor spreading is studied by analyzing the behavior of several global parameters such as reliability and efficiency. Our results show that while networks with homogeneous connectivity patterns reach a higher reliability, scale-free topologies need a less time to reach a steady state with respect the rumor.

Structural topology optimization: Extensibility and attainability

Extensibility and attainability of topology optimization are discussed by investigating a variety of simultaneous topology opti-mization methods extended from the standard formulation.First,the state of the art is highlighted through systematic classification of developed methods,such as simultaneous topology optimizations of microstructure and macrostructure,structure and supports,structure and design-dependent loads,structure and locations of involved components.Second,some recent results about simultaneous topology optimization of structure and applied loads are presented.It is shown that the simultaneous topology optimization is an integrated methodology that extends the concept of standard topology optimization in the sense of systematic design.The presence of more than one kind of design variable of different nature makes the optimization problem complex but enlarges the design space to attain the optimization.

Wedge Operations and Doubling Operations of Real Toric Manifolds

This paper deals with two things. First, the cohomology of canonical extensions of real topological toric manifolds is computed when coefficient ring G is a commutative ring in which 2 is unit in G. Second, the author focuses on a specific canonical extensions called doublings and presents their various properties. They include existence of infinitely many real topological toric manifolds admitting complex structures, and a way to construct infinitely many real toric manifolds which have an odd torsion in their cohomology groups.Moreover, some questions about real topological toric manifolds related to Halperin's toral rank conjecture are presented.

Construction of AFLT States for W_NH Symmetry, Analytic Continuation and Integrability on AGT Relation

We propose a Hamiltonian to the construction of the AFLT states for WNsymmetry. We generalize the AGT relation to generic(extended) conformal field theory with 1 ≤ c < ∞. We analyze the triangular structure hidden in the AGT relation with WNsymmetry in detail and the triangular structure implies the integrability.