共查询到20条相似文献，搜索用时 218 毫秒
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WEB环境下角色的权限控制是一个热点问题,针对此问题详细介绍了一种实用的解决方法.基于角色访问控制模型的方法,并在此基础上根据实际项目设计了基于RBAC的权限认证方法,最后给出权限子系统的步骤,简历初步的权限管理模型. 相似文献
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辨识科学家合作网络的局部结构可以增进对科学家合作行为的理解。基于复杂网络子图搜索和社会网络结构对等性,提出基于子图结构对等的科学家合作网络角色辨识方法,并应用于复杂网络领域科学家合作网络角色分析中。研究界定了六种4节点子图的11种点位,讨论了复杂网络领域科学家合作网络点位特征,并依据科学合作特性将11种点位分为核心、中介和边缘三类角色;分析发现科学家角色种类的多样性,且其种类数与度、介数和接近性等中心性指标呈正相关关系;基于角色相对数量分布将度排名前20位的顶尖科学家分为两个子群体。研究提供了社会合作网络个体行动者角色辨识的定量方法。 相似文献
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区域活动作为一种学前教育的自主性探索活动,对幼儿认知、语言、社会情感等方面的发展具有深远影响。角色区作为一种常见的区角,在激发幼儿主动参与和探索、促进其全面综合发展方面发挥着重要作用。本文探讨了角色区材料投放对于大班幼儿发展的重要性,分析了当前大班角色区材料投放中存在的问题,并提出了相应的解决对策,旨在为大班幼儿角色区材料投放提供有益的参考和指导。 相似文献
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流程管理思想主张以流程为基础对组织进行持续的优化和调整变革,提高组织工作效率。在目前的研究中,存在着两种不同的流程管理方法,即基于活动的流程管理与基于角色的流程管理,二者各有所长。在进行比较分析的基础上,本文提出了一种活动—角色结合的流程管理模式,为复杂多变环境下的流程管理提供了一种新的方法。 相似文献
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基于角色的虚拟研发团队构建方法及其约束机理研究 总被引：1，自引：0，他引：1
提出了角色依赖图的概念，并在此基础上给出了基于角色的虚拟研发团队构建方法。以此为基础，结合周界理论，分析了影响虚拟研发团队开放度和交换率的主要因素，揭示了虚拟研发团队的内在约束机理。 相似文献
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本文提出了基于角色和场景的双语教学评价二维指标体系,利用层次分析法来确定评价指标的权重,构造模糊综合评判矩阵来集结不同角色的评价信息,并在此基础上建立了高校双语教学评价模型,最后通过例子说明该模型的有效性和合理性。 相似文献
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基于特征的意见挖掘中,特征权重计算是一个难点。在对各种权重计算方法深入研究的基础上,提出一种新的权重计算方法以解决该问题。该方法集成了层次分析法和G1法的基本思想,可以有效提高权重计算的准确性。一方面,该方法使用G1法对层次分析法中单层次指标权重计算进行改进,以克服层次分析法中判断矩阵的不一致性带来的问题;另一方面,在单层次指标的层次总权重计算中,提出一个总权重计算通用公式,扩展了层次分析法中层次总权重计算公式,使其更适合一般的应用。 相似文献
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本文提出了基于角色和场景的双语教学评价二维指标体系,利用层次分析法来确定评价指标的权重,构造模糊综合评判矩阵来集结不同角色的评价信息,并在此基础上建立了高校双语教学评价模型,最后通过例子说明该模型的有效性和合理性。 相似文献
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足球机器人具有离散事件系统（DES）的特征，而Petri网是一种很好的离散系统的建模工具，能够比较直观地反映系统的动态特性。因此本文针对多机器人对抗比赛中各个机器人如何分配角色的问题，给出了机器人角色转换的原理和基于计算机多线程编程的动态角色分配协议，并进一步建立了一种基于Petri网的角色转换模型，通过仿真对该模型进行了可达性分析。最后，本文通过实验较好地实现了多机器人之间的角色转换。 相似文献
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《Journal of The Franklin Institute》2006,343(4-5):532-544
There are several language constructs and mechanisms that provide some sort of support for conceptual modeling in object-oriented programming: the Liskov substitution principle, the Meyer programming by contract, the Beta inner construct, interfaces in C# and Java, and the separation of subtype hierarchies from subclass hierarchies as in Timor and Sather. All these mechanisms and constructs are powerful and useful tools to enforce the conceptual modeling trait of the inheritance mechanism in object-oriented programming. Their purpose is to ensure semantic compatibility of classes related by an inheritance hierarchy. When applied independently, these mechanisms can lead to more correct inheritance hierarchies that are easy to understand, use, and extend. This article discusses the different mechanisms and studies the interaction between them. It investigates whether conceptual modeling can be satisfactorily achieved by using such tools. It will be shown that the interaction between these tools might lead to contradictions and might prevent legitimate inheritance hierarchies. This article proposes a framework for a conceptual modeling mechanism that will better support conceptual modeling at the language level. 相似文献
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《中国科学院研究生院学报》1999,(2)
１ Ｉｎｔｒｏｄｕｃｔｉｏｎ ＡｇｒａｐｈＧｉｓａｎｏｒｄｅｒｅｄｐａｉｒｏｆｄｉｓｊｏｉｎｔｓｅｔｓ（Ｖ,Ｅ）ｓｕｃｈｔｈａｔＥｉｓａｓｕｂｓｅｔｏｆｔｈｅｓｅｔｏｆｕｎｏｒｄｅｒｅｄｐａｉｒｓｏｆＶ,ｗｈｅｒｅｔｈｅｓｅｔｓＶａｎｄＥａｒｅｆｉｎｉｔｅ．ＴｈｅｓｅｔＶｉｓｃａｌｌｅｄｔｈｅｓｅｔｏｆｖｅｒｔｉｃｅｓａｎｄＥｉｓｃａｌｌｅｄｔｈｅｓｅｔｏｆｅｄｇｅｓ．ＴｈｅｙａｒｅｕｓｕａｌｌｙｄｅｎｏｔｅｄｂｙＶ（Ｇ）ａｎｄＥ（Ｇ）,ｒｅｓｐｅｃｔｉｖｅｌｙ．Ａｎｅｄｇｅ｛ｘ,ｙ｝ｉｓｓａ… 相似文献
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介绍了IT应用和管理在EPC项目中的地位和作用,结合IT应用管理的工作范围,阐述了EPC项目中IT的工作内容及解决方案,重点分析了AD域、数字专线在广域网架构中的实现方法和作用。同时,运用基于数字专线的语音系统,解决和优化EPC项目通讯需求,以达到实现EPC项目信息化的目的。 相似文献
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The challenges of managing large complex engineering projects, such as those involving the design of infrastructure, aerospace and industrial systems; are widely acknowledged. While there exists a mature set of project management tools and methods, many of today's projects overrun in terms of both time and cost. Existing literature attributes these overruns to factors such as: unforeseen dependencies, a lack of understanding, late changes, poor communication, limited resource availability (inc. personnel), incomplete data and aspects of culture and planning. Fundamental to overcoming these factors belies the challenge of how management information relating to them can be provided, and done so in a cost eff ;ective manner. Motivated by this challenge, recent research has demonstrated how management information can be automatically generated from the evolving digital footprint of an engineering project, which encompasses a broad range of data types and sources. In contrast to existing work that reports the generation, verification and application of methods for generating management information, this paper reviews all the reported methods to appraise the scope of management information that can be automatically generated from the digital footprint. In so doing, the paper presents a reference model for the generation of managerial information from the digital footprint, an appraisal of 27 methods, and a critical reflection of the scope and generalisability of data-driven project management methods. Key findings from the appraisal include the role of email in providing insights into potential issues, the role of computer models in automatically eliciting process and product dependencies, and the role of project documentation in assessing project norms. The critical reflection also raises issues such as privacy, highlights the enabling technologies, and presents opportunities for new Business Intelligence tools that are based on real-time monitoring and analysis of digital footprints. 相似文献
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DNA计算是解决困难问题的一种很重要的方法。应用DNA计算解决图论中的最小支撑树问题。利用DNA的热力学特性,根据边的权长不同,给它们设计不同溶解温度的DNA链。根据温度的不同,电泳时DNA分子的形状不同,电泳的速度也不同,从而根据电泳速度分离出最小支撑树的所有边。在这里给出了5个顶点的赋权图为例来求它的最小支撑树,说明了该方法的简便性。 相似文献
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《Information processing & management》2022,59(3):102891
Syntax parse trees are a method of representing sentence structure and are often used to provide models with syntax information and enhance downstream task performance. Because grammar and syntax are inherently linked, the incorporation of syntax parse trees in GEC is a natural solution. In this work, we present a method of incorporating syntax parse trees for Grammatical Error Correction (GEC). Building off a strong sequence-to-sequence Transformer baseline, we present a unified parse integration method for GEC that allows for the use of both dependency and constituency parse trees, as well as their combination - a syntactic graph. Specifically, on the sentence encoder, we propose a graph encoder that can encode dependency trees and constituent trees at the same time, yielding two representations for terminal nodes (i.e., the token of the sentence) and non-terminal nodes. We next use two cross-attentions (NT-Cross-Attention and T-Cross-Attention) to aggregate these source syntactic representations to the target side for final corrections prediction. In addition to evaluating our models on the popular CoNLL-2014 Shared Task and JFLEG GEC benchmarks, we affirm the effectiveness of our proposed method by testing both varying levels of parsing quality and exploring the use of both parsing formalisms. With further empirical exploration and analysis to identify the source of improvement, we found that rich syntax information provided clear clues for GEC; a syntactic graph composed of multiple syntactic parse trees can effectively compensate for the limited quality and insufficient error correction capability of a single syntactic parse tree. 相似文献
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针对传统收益分配方法不能很好地对具有交流结构限制的动态联盟收益进行分配,以及存在指标权重赋值主观性强等问题,通过结合图对策和云理论提出更为合理有效的收益分配方法。首先以传统平均树解法为分配基础,引入风险承担度、合作努力度和资源投入度等收益影响因素。然后借鉴理想点法(TOPSIS)的思想对云重心评价方法进行改进,基于正负理想状态确定了收益分配的修正系数,以弥补传统收益分配方法的不足。最后将云重心平均树解法应用到动态联盟收益分配的实例中,发现该方法的收益分配结果优于独立经营的结果,从而验证该方法的合理性和可行性。 相似文献