Results 41 to 50 of about 5,129,551 (205)
大数据, 2023 数据中台将一个机构（企业、事业或政府部门）的数据作为战略资产进行管理，是从数据收集到处理应用的一套管理机制，以期提高数据质量，实现广泛的数据共享，最终实现数据价值最大化。给出数据中台的定义，提出数据中台参考技术框架，并分别对物理管理、逻辑管理、数据资产管理、数据服务和信息安全管理的组成和技术进行了展开讨论。最后以华谱系统建设为例，介绍面向家谱大数据、结合HAO智能模型的数据中台实现——华谱数据中台。
吴信东, 应泽宇, 盛绍静, 蒋婷婷, 卜晨阳, 张赞
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International Journal of Urban and Regional Research, EarlyView.Abstract From desert ski resorts to subtropical Winter Games, there is a global proliferation of ‘mission‐impossible’ mega‐projects. The prevailing frameworks of city branding and urban entrepreneurism fail to explain the political logics behind these seemingly irrational projects.
Yiqiu Liu, Sven Daniel Wolfe
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Zhejiang Daxue xuebao. Lixue ban, 2019 利用Riccati 变换技术，借助Bernoulli 不等式和Yang 不等式以及数学分析技巧，研究了具有非线性中立项的二阶广义Emden-Fowler 型微分方程的振动性，考虑非正则情形，建立了该方程的若干振动准则。最后用2 个例子说明，这些准则推广并改进了一些已有的结果，且具有较好的实用性和可操作性。
YANGJiashan(杨甲山) +3 more
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The collective application of shorebird tracking data to conservation
Conservation Biology, EarlyView.Abstract Addressing urgent conservation issues, such as the drastic declines of North American migratory birds, requires creative, evidence‐based, efficient, and collaborative approaches. The abundance of over 50% of monitored North American shorebird populations has declined by over 50% since 1980. To address these declines, we developed a partnership
Autumn‐Lynn Harrison +71 more
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Zhejiang Daxue xuebao. Lixue ban, 2022 针对苯系物泄露次生突发环境事件的应急响应问题，研究了基于案例推理和处置效果的应急方案生成方法。首先，在计算案例相似度时，为避免历史案例不全产生的情景要素遗失，基于随机森林算法，结合专家知识构建了权重求解方法，采用案例检索方法得到相似案例集；然后，构建了应急处置效果评估指标体系，以全面评价相似案例对应的处置效果；进一步，考虑多专家评价可弥补决策者知识、经验等的不足，引入了自适应群共识调整算法，得到群体评价意见，通过集结相似度与处置效果，得到了方案的综合评价值并生成最优方案；最后 ...
HUDongbin(胡东滨) +3 more
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Comprehensive framework for assessing and optimizing existing research networks
Conservation Biology, EarlyView.Abstract Conservation, monitoring, and research networks, or collections of ecological research sites unified under a common mission of data collection or a research mission, are essential infrastructure for understanding large landscapes. However, most networks developed opportunistically over decades rather than through systematic design, creating ...
Alyson East +2 more
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Zhejiang Daxue xuebao. Lixue ban, 2017 针对非奇异M-矩阵B与非奇异M-矩阵A的逆矩阵A-1的Hadamard积的最小特征值τ(B◦A-1)的估计问题，首先利用矩阵A的元素给出A-1各元素的上下界序列，然后利用这些序列和Brauer定理给出τ(B◦A-1)单调递增收敛的下界序列.最后，通过数值算例验证理论结果，显示所得下界序列比现有结果精确，且能收敛到真值.
ZHAOJianxing(赵建兴) +1 more
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Taxonomic and functional diversity of urban bees of the world
Conservation Biology, EarlyView.Abstract Bees play a pivotal role in terrestrial environments. Urbanization can affect these organisms and the ecosystem services they provide. However, knowledge of the global diversity of urban bees is limited. Thus, we summarized data on urban bee species identities and occurrences; compared distributions of all bees with those found in urban ...
João C. F. Cardoso +10 more
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Zhejiang Daxue xuebao. Lixue ban, 2019 根据自治动力系统中周期跟踪性和极限跟踪性的定义，将其引入到非自治动力系统。研究了非自治动力系统中周期跟踪性和极限跟踪性的动力学性质，得到：（1）若拓扑共轭于，则F 具有周期跟踪性当且仅当G 具有周期跟踪性；（2）若拓扑共轭于，则F 具有极限跟踪性当且仅当G具有极限跟踪性；（3）若乘积系统（X × Y，F × G）具有周期跟踪性，则（X，F）和（Y，G）具有周期跟踪性。以上结论对非自治动力系统中跟踪性的发展有一定的促进作用。
JIZhanjiang(冀占江) +1 more
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Emerging applications of large language models in ecology and conservation science
Conservation Biology, EarlyView.Abstract Large language models (LLMs) mark a major development in artificial intelligence, with potentially transformative implications for ecology and conservation science. Built on advanced deep‐learning architectures, these models can support a wide range of tasks. We reviewed emerging applications of LLMs, drawing on the wider scientific literature
Christos Mammides +5 more
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