隐马尔可夫模型及在人脸识别算法中的应用

介绍了隐马尔可夫模型(HMM)及其三大算法,并将其引入人脸识别的研究中,描述了一种基于隐马尔可夫模型的人脸识别方法.一幅正面人脸图像的重要特征具有一定的顺序,它可以通过一维的HMM来建模,每个特征区域被指定为一个状态,通过K-L变换将降维以后的特征矢量作为观察矢量.和其他人脸识别的方法比较,隐马尔可夫模型更能为人脸检测和识别提供灵活的框架.     

影响西藏藏医药产业发展的要素因子分析

藏医药作为西藏的六大特色和支柱产业之一,其发展一直受到诸多要素的限制,文章通过因子分析法,寻找出部分对藏医药产业发展具有主要限制力的因素,并通过五力模型阐释了它们是如何对藏医药发展在起作用。     

蒸汽驱采油物理模型研究(一)

本文用蒸汽驱采油真空物理模型对克拉玛依油田九区七点井网的蒸汽驱采油进行了研究。以相似理论为基础设计建造了模型,研究了蒸汽注入率、干度、生产压力对蒸汽驱性能的影响。实验结果表明,干度、注入率对采收率有显著影响,且在相同能量注入率情况下,干度影响大于注入率。根据油层温度场分析推论,对于中质薄油藏,蒸汽超覆有利于提高采收率和能量注入率。本文介绍了将实际油藏按比例转换为室内模型的相似准则,讨论了原型向模型的转换原则,论述了物理模型实验的流程及模型的制作工艺。     

中国股票市场中收益与风险关系及其国际比较

利用ARCH-M族模型来拟合中国股市和成熟证券市场的收益序列,以揭示股票市场中投资收益与时变风险的关系,并在ARCH-M族模型的范畴内,研究确定了国内外证券市场中时变风险的最佳测度方式。本文通过建模,对中国股市和成熟市场的风险补偿系数以及投资者的风险承受能力进行了比较研究。     

家畜群体变动规律的灰色预测分析

家畜群体的变化是有一定规律的,但要准确地预测这种规律比较困难,利用GM（1,1）灰色预测模型,以新疆托克逊县1993－1998年的人口及各种家畜的存栏和繁残成活数等为原始资料进行了预测分析,经过误差分析表明,本次预测的准确性是较高的,为在今后生产实践中预测家畜的群体发展情况提供了一个可行的方法。     

Deflationary representation,inference, and practice

This paper defends the deflationary character of two recent views regarding scientific representation, namely RIG Hughes' DDI model and the inferential conception. It is first argued that these views' deflationism is akin to the homonymous position in discussions regarding the nature of truth. There, we are invited to consider the platitudes that the predicate “true” obeys at the level of practice, disregarding any deeper, or more substantive, account of its nature. More generally, for any concept X, a deflationary approach is then defined in opposition to a substantive approach, where a substantive approach to X is an analysis of X in terms of some property P, or relation R, accounting for and explaining the standard use of X. It then becomes possible to characterize a deflationary view of scientific representation in three distinct senses, namely: a “no-theory” view, a “minimalist” view, and a “use-based” view—in line with three standard deflationary responses in the philosophical literature on truth. It is then argued that both the DDI model and the inferential conception may be suitably understood in any of these three different senses. The application of these deflationary ‘hermeneutics’ moreover yields significant improvements on the DDI model, which bring it closer to the inferential conception. It is finally argued that what these approaches have in common—the key to any deflationary account of scientific representation—is the denial that scientific representation may be ultimately reduced to any substantive explanatory property of sources, or targets, or their relations.     

具有电磁场的单圈量子宇宙波函数

本文运用有限维微扰方法，计算了在Bianchi-I型度规下电磁场的单圈贡献，给出了Hartle-Hawking单圈量子宇宙波函数。     

系统自然观在解决“奇点”问题的理论中的体现

自然辩证法中关于系统自然观的思想在近代物理学中有着充分的体现,其中包括有关解决"奇点"问题的宇宙模型。该理论能够准确描述宇宙早期的被广义相对论所不容的时空节点。     

Knowledge transfer in theoretical ecology: Implications for incommensurability,voluntarism, and pluralism

Well-known epistemologies of science have implications for how best to understand knowledge transfer (KT). Yet, to date, no serious attempt has been made to explicate these particular implications. This paper infers views about KT from two popular epistemologies; what we characterize as incommensurabilitist views (after Devitt, 2001; Bird, 2002, 2008; Sankey and Hoyningen-Huene 2013) and voluntarist views (after Van Fraassen, 1984; Dupré, 2001; Chakravartty, 2015). We argue views of the former sort define the methodological, ontological, and social conditions under which research operates within ‘different worlds’ (to use Kuhn's expression), and entail that genuine KTs under those conditions should be difficult or even impossible. By contrast, more liberal voluntarist views recognize epistemological processes that allow for transfers across different sciences even under such conditions. After outlining these antithetical positions, we identify two kinds of KTs present in well-known episodes in the history of ecology—specifically, successful model transfers from chemical kinetics and thermodynamics into areas of ecological research—which reveal significant limitations of incommensurabilitist views. We conclude by discussing how the selected examples support a pluralistic voluntarism regarding KT.