基于不同节点移动模式的无线自组网路由协议性能分析

本文采用NS2网络仿真软件,随机建立包含100个节点的网络拓扑,在节点静止、缓慢移动和快速移动条件下,分别对AODV、DSR和DSDV三种路由协议的数据包端到端时延、抖动和吞吐量的变化趋势进行比较分析。仿真结果表明,在网络规模较大且网络拓扑变化不频繁的情况下,DSDV具有一定的优势;在网络规模较大且网络拓扑多变的情况下,AODV和DSR性能明显优于DSDV。     

基于多输入海况条件下的船舶运动模型分析

建立静水船舶操纵运动方程,加入风浪流的干扰和作用力,建立风浪流作用下的船舶操纵性运动方程。通过对船舶不同舵角下的旋回运动进行仿真试验,得出其的回转操纵性能与舵角的关系曲线。通过数据分析表明:随着回转操纵舵角的增大,该船舶旋回运动轨迹的漂移距离将减小,但减幅逐渐减小。通过研究船舶在风浪流干扰下的仿真运动,可以充分发挥出其操纵性能,进而提高大洋航行和港口靠泊的效率与安全性。     

行波极性比较式方向保护仿真分析

文章使用已运行的1000kV交流输电线路的线路参数,在PSCAD/EMTDC中建立仿真模型,对行波极性比较式方向保护做仿真试验,探讨行波方向保护在特高压线路上的应用可行性。对故障初始角等因素进行仿真和分析,结果表明除故障初始角为0°外,其他故障初始条件对保护判断几乎没有任何影响。     

无人机遥控数据链电磁环境适应性仿真研究

运用Simulink的仿真平台,搭建了基于直接扩频技术的无人机遥控链路模型,统计分析了在高斯白噪声条件下,链路受到窄带干扰、宽带干扰及梳状谱干扰时的误码率情况,评估了无人机遥控链路对抗各种干扰的能力。     

非正态分布条件下工序能力的度量

工序能力指数是度量工序能力的指标。一般情况下，工序输出服从正态分布。但是，在实际应用中，存在着大量非正态现象，使得传统的工序能力指数度量失准。本文对已有的工序能力指数计算方法及所依据的小概率事件原理进行了分析，在此基础上提出了实用的非正态分布条件下工序能力度量的方法。     

地铁列车初始布点的鲁棒性研究

针对车辆段内干扰源对地铁列车运行的扰动,以列车连带晚点期望值最小为目标,确定地铁列车平峰时段的始发时刻,分配初始缓冲时间。细分连带晚点,详细描述了连带晚点传播的各种情况,建立了简单情形下地铁列车初始布点的理论模型。经分析,该模型为凸规划的约束极值问题,且证明在小干扰条件下,均衡初始布点的列车时刻表为模型的最优解。     

供应商参与产品创新的供应链协调研究

考虑供应商对产品创新的投入会影响未来需求,分析了初始需求为确定型和随机型两种情况下,供应商的最优创新投入策略和制造商的最优订货策略,给出了实现供应链协调的条件。研究表明,在确定初始需求下,要实现供应链的协调,只需要制造商给予创新失败的供应商一定的创新补贴;而在随机初始需求下,创新补贴与其他机制同时使用才能实现供应链协调。     

改进的干扰观察法在光伏系统MPPT中的应用

针对光伏发电系统最大功率跟踪问题,提出了一种改进的干扰观察算法。仿真实验结果表明,在外界环境变化的情况下,改进的方法在保证系统稳定性的前提下,使得光伏阵列能更快速、准确地跟踪最大功率点。     

汽车燃油箱燃油晃动异响成因及防浪板方案研究

文章对汽车燃油箱燃油晃动异响成因进行了分析,对比了金属油箱、塑料油箱及横置、纵置情况下的油箱晃动异响表现,并总结出一些缺陷油箱结构形式,进而提出了异响问题的解决方法。采用文章所述的方法,对某问题油箱进行防浪板设计、应用,有效地消除了异响,显著提高了整车NVH效果。文章增加了燃油箱设计者对燃油箱的燃油晃动异响机理的认识,并提供了几种缺陷油箱结构形式及燃油晃动异响的解决方法。     

QX-4隧道清洗车水罐等效力学模型分析

文章通过理论计算分析,可得出隧道清洗车水罐内部液态水晃动的固有频率及振型;通过ANSYS分析软件对水罐及内部液态水进行有限元仿真分析,得到水罐内部液态水晃动的固有频率及振型;对比两者结果,误差在有效范围内,理论计算结果正确;结合理论计算与有限元仿真分析结果建立水罐的等效力学模型,用于隧道清洗车的动力学仿真分析。     

AUV回收定位系统的设计与研究

本文针对AUV回收过程中的定位问题,提出了一种基于单片机、GPS模块以及数传电台的AUV回收定位模块设计方案,采用数传电台与GPS相结合的远程遥控方式,实现AUV回收定位系统实时采集、处理、无线传输及远程监控等功能。     

Survey of business process management: challenges and solutions

The current literature shows that creating a good framework on business process model (PM) is not an easy task. A successful business PM should have the ability to ensure accurate alignment between business processes (BPs) and information technology (IT) designs, provide security protection, manage the rapidly changing business environment and BPs, manage customer power, be flexible for reengineering and ensure that IT goals can be easily derived from business goals and hence an information system (IS) can be easily implemented. This article presents an overview of research in the business PM domain. We have presented a review of the challenges facing business PMs, such as misalignment between business and IT, difficulty of deriving IT goals from business goals, creating secured business PM, reengineering BPs, managing the rapidly changing BP and business environment and managing customer power. Also, it presents the limitations of existing business PM frameworks. Finally, we outline several guidelines to create good business PM and the possible further research directions in the business PM domain.     

自主水下航行器导航与定位技术

精确导航与定位对AUV执行水下作业任务的安全性和有效性至关重要.与陆地导航定位相比,由于全球卫星导航系统(GNSS)在水下不可用以及海洋环境的独特物理特性,水下导航定位更具挑战性.近年来用于AUV导航定位的传感器在性能和精度方面有了显著的提升,除此之外,同步定位与地图构建、协同定位算法的日益成熟极大的提升了AUV导航定...     

Aligning ERP systems with companies’ real needs: an ‘Operational Model Based’ method

Enterprise Resource Planning (ERP) systems offer standard functionalities that have to be configured and customised by a specific company depending on its own requirements. A consistent alignment is therefore an essential success factor of ERP projects. To manage this alignment, an ‘Operational Model Based’ method is proposed. It is based on the design and the matching of models, and conforms to the modelling views and constructs of the ISO 19439 and 19440 enterprise-modelling standards. It is characterised by: (1) a predefined design and matching order of the models; (2) the formalisation, in terms of modelling constructs, of alignment and misalignment situations; and (3) their association with a set of decisions in order to mitigate the misalignment risk. Thus, a comprehensive understanding of the alignment management during ERP projects is given. Unlike existing methods, this one includes decisions related to the organisational changes an ERP system can induce, as well as criteria on which the best decision can be based. In this way, it provides effective support and guidance to companies implementing ERP systems, as the alignment process is detailed and structured. The method is applied on the ERP project of a Small and Medium Enterprise, showing that it can be used even in contexts where the ERP project expertise level is low.     

Alignment of strategic priorities and performance: an integration of operations and strategic management perspectives

In theory, strategic priorities at the functional level align with and support business level strategies. Alignment of priorities is presumed to contribute to enhanced organizational performance, just as misalignment is expected to undermine performance. This study further develops and tests these theoretical conventions by examining the perceptions of general managers and manufacturing managers regarding manufacturing priorities of their business units. Based on a sample of matched pairs of manufacturing managers and general managers from 98 manufacturing plants, the hypotheses regarding the alignment–performance relationship are tested. Specifically, we tested whether the performance of the manufacturing unit is enhanced when general managers and manufacturing managers agree on strategic priorities. Furthermore, the influence of organizational factors on the relationship between alignment and performance of the manufacturing unit is studied. Results support our hypotheses that certain organizational variables moderate the relationship between alignment of priorities and manufacturing performance.     

地效飞行器周围流体场数值模拟

本文使用ansys fluent对二维机翼在近地(海)条件下受力分析,得出了飞行器在近地(海)状况变化不大条件下飞行器的受力分布、周围流体场的分布和在飞行器附近存在爆炸压力波情况下飞行器受力变化以及周围流体场的变化情况,可以为研究地效飞行器的研究人员在研究地效飞行器遇到爆炸等不稳定的近地(海)条件下飞行器额平稳性操作,平稳性设计提供一些理论上的基础。     

地震波入射角度对连续梁桥地震响应的影响

为了研究地震波入射角度不同对连续梁桥地震响应的影响,以某48+80+48m的连续梁桥为研究对象,分别计算了地震波沿不同角度入射时墩底的响应和跨中的位移。分析结果表明地震波入射角度是地震分析中不可忽略的影响因素,输入不同方向的地震波和提取不同方向的响应值,会对分析结论产生很大甚至相反的影响。应对不同地震波入射角度进行分析,最后选取最不利入射角度作为计算条件,进行计算分析。     

Playing on Two Chessboards: Reputation Effects between Corporate Social Responsibility (CSR) and Corporate Political Activity (CPA)

It has recently been argued that corporate social responsibility (CSR) is ‘political’. It has been neglected however, that firms also operate politically in a traditional sense, in seeking to secure favourable political conditions for their businesses. We argue that there are potential synergies between CSR and corporate political activity (CPA) that are often overlooked by firms and that recognition of these synergies will stimulate firms to align their CSR and CPA. We develop a conceptual model that specifies how various configurations of a firm's CSR and CPA – alignment, misalignment, and non‐alignment – affect the firm's reputation beyond the separate reputation effects of CSR and CPA. This model has important implications for understanding how and why firms should pay attention to their CPA and CSR configurations, and thereby contributes to the broader issue of why firms should make sure that they are consistent in terms of responding to stakeholder concerns.     

高校家庭经济困难学生量化认定研究

高校家庭经济困难学生认定是有效开展资助工作的基础,很多高校就经济困难学生的家庭实际情况,大致将其分为特别贫困、贫困、困难三种类别,对其资助力度也不尽相同。但在其认定的过程中,主客观因素导致认定程序复杂,失准情况时常发生,因此构建家庭经济困难学生量化认定尤为重要。     

How leaders shape the impact of HR's diversity practices on employee inclusion

In this paper we develop a theoretical framework about how leaders help shape the impact of HR diversity practices on employee inclusion. So far, the HR literature has given leaders a relatively passive role in that they are mainly seen as enactors and communicators of HR policies and practices. We expand this view by suggesting that leaders can respond to HR's (diversity) practices with various levels of alignment (or misalignment), and clarify the respective implications for felt inclusion. Informed by literature on multiple identities at work, we derive four potential responses of leaders to HR's diversity practices—deletion, compartmentalization, aggregation, and integration. We show how these responses shape the effects of diversity practices on employee inclusion, and in doing so, we also question a commonly held assumption that leaders' full alignment with HR's diversity practices is the most conducive for employees' felt inclusion. Our framework has important implications for theory and practice, as it specifies the role of leaders in leveraging the inclusive potential of HR diversity practices.