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为实现对复杂访问控制策略的统一管理,检测并排除冲突和不完备的访问控制策略,提出了利用访问控制策略集合中的偏序信息构造融合主体、客体层级结构的有向无环图模型。首先从理论上证明了构建有向无环图模型的可行性,并提出利用偏序关系构建有向无环图模型的实施算法,然后利用有向无环图模型的节点集合设计了访问控制策略一致性和完备性检测算法,最后对模型构建算法及访问控制策略一致性和完备性检测算法进行实验验证。实验结果表明,融合主体、客体层级结构的有向无环图模型可以有效管理复杂系统中访问控制策略中出现的冲突与策略不完备情况。相关算法可以有效地实现对复杂访问控制策略的统一管理。 相似文献
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独立董事引入后董事间的冲突变化 总被引:6,自引:0,他引:6
本文从我国上市公司特有的股权状况出发,对独立董事引入前后上市公司董事会的冲突差异进行了论述,分析了独立董事的引入可能给新的董事会带来的冲突种类及成因,并提出相关对策。为我国上市公司独立董事引入后如何减少冲突,提高董事会决策效率提供借鉴与参考。 相似文献
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冲突是指社会中单位之间,个人之间,个人与群体之间,由于一方阻碍了另一方的需要欲望的满足及目标的达成而引起的情绪、认知与行为的反应。 冲突是普遍存在的,若冲突处理不好,则有可能造成企业内部人际关系紧张,职工心理健康受损,工作积极性受到压抑,企业目标受挫,资源浪费,效率下降。反之,则会促使问题得到更好更快解决,资源合理利用,达到企业既定的目标。因此研究冲突问题具有重要的现实意义。基于国内对冲突研究几乎为空白的情况,本文致力于我国企业内部冲突原因及其对策分析,这对于开展冲突问题的研究无疑上有一定的促进作用。 相似文献
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调频网点的生成体现随机性,其加网效率与多种因素相关。本文重点讨论乘同余伪随机算法生成调频网点的效率问题。首先介绍了伪随机算法用于调频加网生成网点的基本原理,在此基础上讨论了乘同余伪随机算法实现调频加网的方法机制,同时提出5种可用于调频网点生成的随机函数,并通过定量实验对5组乘同余伪随机函数生成随机数效率进行了讨论和研究。通过分析数据和曲线走势图,得出不同条件对加网效率的影响趋势,为调频加网用于印刷生产提供了理论参考。 相似文献
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本文提出用正交化解线性方程组的方法。该方法结构简单,而且不选主元。因此对相当广泛一类问道,计算量大为减少。若进行并行计算就更为显著。 相似文献
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In this study, we examine the interplays among coopetition, conflicts, trust, and efficiency process innovation in vertical business-to-business (B2B) relationships. We posit that, in vertical B2B relationships, coopetition is positively associated with efficiency process innovation. Such association is also mediated by conflicts (i.e., affective and cognitive), thus resulting in the indirect effects of vertical coopetition on efficiency process innovation through affective and cognitive conflicts. In addition, we hypothesize that the conflict-based indirect effects are contingent on the trust level in the coopetitive relationships. We then empirically test the proposed hypotheses, using survey data collected from two international trade fairs. The results yield support for the positive association between vertical coopetition and efficiency process innovation. The mediating role of affective conflict in the indirect effect of vertical coopetition on efficiency process innovation is also supported, but that of cognitive conflict is not. Finally, the results indicate that trust moderates the indirect effect of vertical coopetition on efficiency process innovation through cognitive conflict but not through affective conflict. The implications of our findings for future research and managerial practices are also discussed. 相似文献
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为了解决高速公路出行路径选择问题,基于图论模糊算法,提出了大数据下的智慧诱导技术。首先对高速路网在路径诱导的实时性、线路规划的精准度和算法的适用性方面进行优化;其次通过利用贪心算法和整体寻优算法,对经典路径诱导算法进行研究和比选;最后针对高速路网提出基于大数据动态规划的路径诱导技术,采用大数据、内存计算、图计算和AI结合的方式来实现大数据的动态实时路径诱导。研究结果表明,智慧诱导技术可主动为有不同诉求目标的出行者提供实时最优的方案选择,解决复杂路网下动态路径的合理诱导问题。所提出的方法可实现大数据驱动下的智慧诱导,对进一步提升公路智能化和精细化管理水平具有借鉴意义。 相似文献
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如何解决建筑企业在多个项目中资源利用率和配置效率低下的问题,是施工方项目管理的一大难题。本文根据多项目工程施工特点,建立了多项目并行施工时的资源均衡优化模型。为了提高遗传算法对多项目资源配置问题求解的性能,本文对遗传算法进行了改进,并以某公司3 个并行施工的工程项目为例,根据工程施工初始网络计划的资源需求,运用改进遗传算法(IGA)和遗传算法(GA)计算多项目的资源配置方差。结果表明,改进遗传算法可使资源配置达到更好的优化状态,并能得到各个项目非关键线路上工序的最佳开工时间,为建筑施工企业提供了具有实践价值的技术手段。 相似文献
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本文针对计算机绘图中截面交线法这种图形处理方法,在分析计算及消隐理论的基础上提出改进措施,使之不仅具有运算速度快、占用内存少的特点,而且克服了计算机绘图中常见的消隐不彻底的问题,较好地反映了三维立体曲面的图形。并且从不同方位进行动态观察曲面形体的尝试成为可能。 相似文献
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为了探究知识产权保护对技术创新影响的行业差异,本文运用中国37个行业2006~2011年的面板数据,基于技术差距和相对规模,探究了知识产权制度变革对产业创新影响的行业异质性。研究发现:人均专利数量是衡量技术创新的理想指标;加强知识产权保护,有利于促进技术进步;技术创新渠道正在发生变化,即更注重国内自主创新和内部技术转移;技术差距越小越有利于技术进步,相对规模越大越有利于技术创新。本文建议:在研究技术创新时,可以选择从业人员人均专利数量作为创新指标;加强知识产权执法水平,提升知识产权保护力度;技术创新过程中更应该注重自主创新和内部技术转移,不断缩小与发达国家的技术差距,同时还应该扩大行业相对规模。 相似文献
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There is little empirical research published testing the interdependency between conflict in business-to-business relationships and commercial performance. The “conflict-performance assumption”—all other factors being equal, relationships where conflict is low will outperform relationships where conflict levels are higher—remains central in the marketing channels' literature despite insufficient and contradictory empirical evidence. There are several explanations for the lack of a clear relationship between conflict and performance. Rosenbloom [J. Mark. 37 (1973) 26] theorises that the relationship between conflict and channel performance follows an inverted U-shaped curve, where conflict is most productive at moderate levels and least productive at very low or high levels. Others have argued for a simpler, linear relationship between conflict and performance, usually negative in nature. Various theories about the conflict-performance relationship are empirically tested in a large marketing channel, using a number of dyadic and monadic measures of conflict (latent, perceived, and affective) and two objective measures of performance (effectiveness and efficiency). A linear model (performance declining as conflict increases) is adequate to explain the relationship between dyadic measures of both perceived and affective conflict and channel effectiveness. A threshold model is found to be superior to a linear model in explaining the relationship between dyadic measures of perceived and affective conflict and efficiency. Conflict increases slowly as efficiency falls until a threshold is reached when conflict escalates. Practical implications include that companies need to consider whether performance criteria affecting efficiency are as important to their business partners as those affecting effectiveness. If they are not, then business partners should be rewarded for meeting any such criteria that are more important to the one side of a relationship dyad than to the other. 相似文献
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金融是一国最基本的战略资源,是经济发展的引擎,利用引擎的改变可以刺激其他要素,推动整个经济的发展。文章采用PanelData模型对1995年~2009年全国及省际经济增长与银行信贷资金分布的相关数据进行整理和分析,研究发现,从总体趋势上看,信贷资金分布与经济发展高度相关,贷款是推动区域经济增长的重要因素.但贷款对区域经济增长的贡献效率明显不同,存在不平衡性。因此,实现金融资源和风险的最优配置,建立一个高效、运行良好的金融体系至关重要。 相似文献
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Kenneth Le Meunier-FitzHugh Author Vitae Graham R. Massey Author Vitae Nigel F. Piercy Author Vitae 《Industrial Marketing Management》2011,40(7):1161-1171
This research was carried out using five case studies and a survey to discover how sales and marketing managers are rewarded and if alignment of rewards can improve collaboration between sales and marketing and/or reduce inter-functional conflict. In addition, it examined the role of senior managers' support for coordination on sales/marketing collaboration. The results reveal that organizations which use aligned rewards can increase sales/marketing collaboration through such reward structures, but not reduce inter-functional conflict. In addition, senior managers' support for coordination is vital, as it increases sales/marketing collaboration, and strongly reduces inter-functional conflict. This is important because inter-functional conflict has a strong negative impact on collaboration between sales and marketing in business to business firms. 相似文献
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针对集群渲染系统在三维场景文件输出过程中,海量数据处理以及存储的问题,利用Hadoop框架对现有系统进行分布式模型改造,以基于延迟光照算法的处理方式,对分布式存储和计算的业务逻辑结构部署,实现改进Hadoop集群渲染系统对任务的处理策略,提供高容错、可靠的存储和海量计算数据的方式。通过实验证明改进的Hadoop集群渲染系统可以提高系统利用率和任务处理能力。 相似文献