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结合差分隐私与安全聚集的联邦空间数据发布方法
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作者 张治政 张啸剑 +1 位作者 王俊清 冯光辉 《计算机应用》 CSCD 北大核心 2024年第9期2777-2784,共8页
针对联邦空间数据的数据孤岛问题、空间数据索引问题以及发布联邦空间数据存在的隐私问题,提出基于动态四分树的联邦空间数据发布(FSP)方法。首先,在FSP方法的每轮迭代中,服务端把四分树副本共享给该轮中每个客户端,每个客户端利用四分... 针对联邦空间数据的数据孤岛问题、空间数据索引问题以及发布联邦空间数据存在的隐私问题,提出基于动态四分树的联邦空间数据发布(FSP)方法。首先,在FSP方法的每轮迭代中,服务端把四分树副本共享给该轮中每个客户端,每个客户端利用四分树副本编码自身位置数据,利用Polya分布产生离散噪声在本地扰动编码结果;其次,结合容错学习(LWE)生成本地掩码对噪声结果进行加密;再次,安全聚集端结合该轮迭代中每个客户端的报告值,执行安全聚集与消除掩码操作,然后把聚集结果发送给服务端;最后,服务端结合收集的编码向量与噪声方差自底向上地动态修剪四分树结构。在Beijing、Checkin、NYC和Landmark 4个空间数据集上的实验结果表明,FSP方法在保证客户端隐私的同时,与已有的较好的联邦空间数据发布方法AHH(Adaptive Hierarchical Histograms)相比,在隐私预算为1.8时,FSP的均方误差(MSE)分别降低了3.80%、2.96%、7.51%和14.13%。可见使用FSP方法进行联邦空间数据发布的精度优于同类方法。 展开更多
关键词 联邦分析 分布式差分隐私 安全聚集 空间数据发布 四分树
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Retro-Analysis of Rehabilitation of Existing Bridge over the River Cubiculo on Federal Highway BR-101, Brazil
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作者 Iviane Cunha e Santos Fabio Pessoa da Silva Nunes Thyala Anarelli Cunha e Santos 《Journal of Mechanics Engineering and Automation》 2016年第8期434-441,共8页
This work describes the retro-analysis of design of rehabilitation of existing bridge over the river Cubiculo on BR-101 in Santa Catarina, Brazil, aiming to evaluate the intervention processes. In this way, it was ver... This work describes the retro-analysis of design of rehabilitation of existing bridge over the river Cubiculo on BR-101 in Santa Catarina, Brazil, aiming to evaluate the intervention processes. In this way, it was verified that the project adopted for strengthening of the structure was not adequate to support the evolution of the maximum load over time and the overload due to widening, and it was also verified that the changes in the load factor do not comply with the update of the Brazilian Technical Standards ABNT: NBR-7188 [1]. The retro-analysis of the bridge rehabilitation project has demonstrated fundamental importance to avoid possible design failings, accidents, and reworks. Affirming that it is essential to comply with Standards and Technical Manuals on the elaboration of the rehabilitation project of structures and in choosing the type of intervention to the existing structure. 展开更多
关键词 Maintenance REHABILITATION WIDENING and strengthening.
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The Prediction of Bankruptcy in a Construction Industry of Russian Federation
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作者 Elena Makeeva Ekaterina Neretina 《Journal of Modern Accounting and Auditing》 2013年第2期256-271,共16页
The problem of the firm bankruptcy prediction was investigated by foreign researchers in the 1930s and it still remains relevant. Since the publishing of Altman's (1968) major work, based on multiple discriminant a... The problem of the firm bankruptcy prediction was investigated by foreign researchers in the 1930s and it still remains relevant. Since the publishing of Altman's (1968) major work, based on multiple discriminant analysis (MDA), this methodological area has considerably changed. Taking into consideration that new data have appeared in the course of time, companies' average size has changed, and the accounting standards have changed (Altman, Haldeman, & Narayanan, 1977), methods and models should be renewed so as to be appropriate for current situation. The purpose of this paper1 is to reveal factors causing bankruptcy and use models appropriate for prediction bankruptcy in the area of a construction industry during the financial crisis. This investigation has been carried out on the basis of logit and probit analysis. The main reasons of bankruptcy revealed in the course of this investigation are the following: (1) non-optimal capital structure formation; (2) ineffective liquidity management; (3) decrease in assets profitability; and (4) decrease in short-term assets turnover. The most reliable indicators which give warning of bankruptcy ahead of others are financial instability and liquidity ratios. 展开更多
关键词 bankruptcy prediction construction industry logit and probit analysis
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