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由于“语义鸿沟”的存在,自动图像标注是一项极具挑战性的工作。考虑到图像低层视觉特征与高层语义概念的差异,分别从图像表示与语义建模两个方面来实现自动图像标注。在图像表示方面,提出了一种正则化约束下的非负张量表示方法,用以提取符合人眼视觉直观理解的图像高阶结构特征。在语义建模方面,提出了一种三层贝叶斯模型——扩展隐Dirichlet分配。该模型利用隐变量来实现图像与标注词的关联,并通过一种基于变分推理的期望最大值方法来估计其参数。实验结果表明,ELDA模型在大规模数据库NUS-WIDE上的标注结果相较于现有方法有了显著的提高。 相似文献
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邢焕革 《海军工程大学学报》1997,(2)
基于知识的模型表示是信息管理系统,特别是决策支持系统(DSS)的基础。根据模型管理和模型建立动态性原则的要求,提出了模型知识化的框架表示法,并给出了应用实例。 相似文献
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Rosalia de la Cruz Gitau 《African Security Review》2013,22(4):64-78
Recently, in July 2012, the high-profile and bitterly fought nine-month race for the post of Chair of the African Union (AU) Commission, between Dr Jean Ping of Gabon, and his main challenger, Dr Nkosazana Dlamini-Zuma, culminated in the latter's victory. Her victory came after the deadlock at the Eighteenth AU Summit in January 2012. Borne out of the considered need for a quick fix through reliance on a vote of expediency, the election of Dr Dlamini-Zuma represented a political resolution to the crisis that arose due to the earlier ongoing electoral deadlock. Far from being a competitive election by design, the 2012 AU Commission election by default became transformed into an intensely fought campaign that put the AU in the limelight. This article briefly introduces the electoral process, explains in detail the voting behaviour of AU member states, and offers five specific reasons for the victory of Dr Dlamini-Zuma. On the surface the election looks very competitive, but the article explains why this is not the case. To create greater competition for these posts, the AU needs to overhaul the nomination process and the voting procedure. In this regard, the article proffers detailed analysis and proposes a radical revision of the existing criteria for the nomination. The article also proposes specific recommendations for the amendment of the rules of procedure of the AU Assembly to allow for a qualified majority as a deadlock breaker in the fifth round. It also assesses whether the integrity of the AU Commission election was damaged during the campaigning and voting process. In this regard, it recommends the development of a code of conduct for future elections at the AU. 相似文献
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Abstract Even though the Movimento Popular de Libertação de Angola (Popular Movement for the Liberation of Angola, MPLA) managed to take firm control of the state as the war ended in 2002, this article contends that its hegemony is not absolute. At the fringes of the state administration, emerging regional elites have established associations that seek to provide a remedy against the centralised system, which essentially deprives regions of political influence and sufficient economic resources. As in many other countries on the African continent, political identities that were legally enforced and institutionally reproduced in colonial times have hardly been transcended in the post-colonial period. Even if the associations' influence today does not yet reach further than bringing some insecurity to an otherwise secure polity dominated by the MPLA, the associations could play a role in reinforcing strong regional solidarity and give political expression to feelings of exclusion. Such sentiments could in turn lead to an increase of exclusivity ideas about citizenship, or even xenophobic violence. Much will depend on the strategies of the MPLA, and to what extent it will accommodate these emergent forces in the post-war era, not the least through the current sub-national state reforms. 相似文献
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在分析典型稀疏表示分类方法和局限性的基础上,提出了一种基于局部约束的二维稀疏表示方法,以有效解决SAR图像目标识别问题。该方法对SAR图像进行图像预处理,在兼顾图像相邻列(行)对应稀疏表示系数邻近性和样本间局部性的基础上,构建了局部约束目标函数,并通过解闭式解,实现稀疏表示系数的更新求解。利用美国实测MSTAR数据对算法进行了仿真验证,实验结果表明所提出的方法可实现SAR图像目标的有效识别,并对训练样本数目具有一定的鲁棒性。 相似文献
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多任务时间规划冲突检测方法 总被引:1,自引:0,他引:1
摘要:针对多任务的时间规划问题,基于Simple Temporal Networks(STN)时态表示模型和时态推理方法,提出了一种时间冲突检测的智能方法,并对该方法给予了数学证明。实验表明,该方法能够检测出基于STN表示的作战方案的时间冲突,并对任务时间规划提供参考范围,可有效辅助指挥员快速制定作战方案的时间规划。 相似文献
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康颖 《海军工程大学学报》2009,21(6)
利用量子体系态空间基矢的完备性,通过表象变换,直接计算出转动算符∧D(α,β,γ)在{∧J~2,∧J_z}表象中的矩阵表示.该方法简单而有效. 相似文献