Two-Party Privacy-Preserving Set Intersection with FHE

A two-party private set intersection allows two parties, the client and the server, to compute an intersection over their private sets, without revealing any information beyond the intersecting elements. We present a novel private set intersection protocol based on Shuhong Gao’s fully homomorphic encryption scheme and prove the security of the protocol in the semi-honest model. We also present a variant of the protocol which is a completely novel construction for computing the intersection based on Bloom filter and fully homomorphic encryption, and the protocol’s complexity is independent of the set size of the client. The security of the protocols relies on the learning with errors and ring learning with error problems. Furthermore, in the cloud with malicious adversaries, the computation of the private set intersection can be outsourced to the cloud service provider without revealing any private information.     

Emissions of non-methane hydrocarbons from cars in China

This study investigated the exhaust emission of non-methane hydrocarbons(NMHCs) from cars in China at the Beijing driving cycle on the chassis dynamometer.The emission factor average of NMHCs was 0.9 g/km,which was over twice that from the Australian car fleet and 2-4 times that of the American car emission in the 1990s-2000s.The emission profile of Beijing cars showed higher fractions of aromatics and C4?C7 HCs,and lower percentages of C2?C3 HCs,compared with those of the US car fleet.The average ratio of ...     

基于政府补贴的养老服务市场供给研究

随着我国老龄化速度加快,养老服务的有效供给问题是政府和学者关注的焦点。考虑政府财政补贴下,引入民办与公办养老服务的替代因子,构建民办养老机构与公办养老机构的服务动态供给模型,分析不同补贴方式和补贴力度对服务均衡供给量的影响,并进一步通过补贴乘数分析政府补贴对养老服务机构最优供给决策的影响程度。结果表明:政府对民办养老机构的财政补贴可以增加养老服务市场供给量,相较于运营补贴,政府建设补贴的政策效应更加明显;财政补贴降低了民办养老机构的建设成本和投资风险,刺激社会资本投入的积极性,民办养老服务供给增加幅度大于公办养老服务供给减少幅度,养老服务市场有效供给增加。在财政预算约束下,选择恰当的财政补贴方式,可以提高财政资源的配置效率,增加养老服务市场的有效供给,缓解养老服务财政压力。     

私募股权基金在华Pre-IPO投资的影响因素分析

经历过金融危机的洗礼,私募股权基金(Private Equity Fund)"巨头"们在全球资本市场上,尤其是在亚洲资本市场上再次迅猛发展.中国正被国际目光所聚焦,备受PE亲睐.不过,专门研究Pre-IPO基金对中国企业投资运作的文献甚少.借鉴国内外相关研究成果,从私募股权基金的角度出发,研究其在中国Pre-IPO投资项目时选择目标企业所考虑的相关条件及主要影响因素.采用相关性分析和因子分析相结合的综合实证方法分析,对所选取的样本进行了统计分析.在相关性分析法中,通过考察包括有、无Pre-IPO基金参与投资的样本的诸多项指标,从中找出与Pre-IPO投资这项指标相关系数较高的十四项指标,并具体分析了它们之间的关系.接着用因子分析法进一步对有Pre-IPO基金参与投资的样本进行分析.综合评价各项指标间的内部关系并以此得到指标的分类,从而得出影响私募股权基金选择目标企业投资Pre-IPO的主要因素.通过分析,以期对想"牵手"私募股权基金"巨头"们来实现上市融资的国内企业,有实质性的借鉴作用和可操作意义.     

城市道路轻型汽车行驶工况的构建与评估

为了提升政府公信力,构建符合城市道路汽车行驶工况已是迫在眉睫.基于一辆汽车耗时20天道路实际行驶数据,首先提出约束条件下单目标数学0-1规划模型对数据进行预处理,根据时间连续性得到运动学片段数量;再者,应用随机组合方法对片段进行优化组合构建符合时间长度的待选工况,从中选择与总体数据平均误差最小为4.15％的作为代表工况...     

居民生活私人交通碳排放驱动因素的“三级分解”模型

突破以往采用难以保证精确性估算数据的局限,根据居民生活私人交通所消耗的能源种类,利用官方统计年鉴中的数据,在保证数据真实性的基础上,基于扩展的IPAT与LMDI模型,构建一个包含居民私人交通碳排放强度、碳排放结构、交通消费倾向、收入、家庭规模与户数6个因素的居民私人交通碳排放驱动因素的"三级分解模型",对居民生活私人碳排放及其驱动因素进行核算.结果建议进一步降低居民私人交通碳排放强度,提高居民能源消费的利用效率;同时鼓励发展小排量与新能源汽车消费,并且大力发展公共交通,倡导居民出行多采用公共交通工具出行,引导节能减排的出行方式.     

辽宁省私家车保有量增长及影响因素分析

近年来,辽宁省的经济稳步发展,私家车保有量在快速上升.私家车保有量的变化趋势与辽宁省的基础设施建设、城市发展、交通以及环保等政策的制定有着密切联系,因此,准确的预测未来辽宁省私家车保有量有重要意义.本文以辽宁省1996~2015年私家车发展情况为研究对象,运用统计学及计量经济学相关知识,建立多元线性回归模型来分析私家车保有量的影响因素,经过模型检验和修正,进而分析各因素与保有量的影响关系.最后,根据得到的研究结果,对未来几年辽宁省私家车保有量进行预测并针对辽宁特殊的社会经济状况,为改善建成环境中潜藏着的复杂问题提出相关政策和建议.     

Efficient quantum private comparison protocol utilizing single photons and rotational encryption

As a branch of quantum secure multiparty computation, quantum private comparison is applied frequently in many fields, such as secret elections, private voting, and identification. A quantum private comparison protocol with higher efficiency and easier implementation is proposed in this paper. The private secrets are encoded as single polarized photons and then encrypted with a homomorphic rotational encryption method. Relying on this method and the circular transmission mode, we implement the multiplexing of photons, raising the efficiency of our protocol to 100%. Our protocol is easy to realize since only single photons, unitary operation, and single-particle measurement are introduced. Meanwhile, the analysis shows that our protocol is also correct and secure.     

Application of a likelihood ratio approach in solving a comparison problem of Raman spectra recorded for blue automotive paints

Evidential values of Raman spectra recorded for solid and metallic blue car paints were evaluated using visual comparison as well as a statistical approach, i.e. likelihood ratio (LR) test supported by Empirical Cross Entropy (ECE) results. Raman spectra were obtained using a Renishaw inVia spectrometer equipped with a confocal Leica microscope and a near infrared semiconductor laser (785 nm) as an excitation source. When a visual comparison was performed for solid paints, in 17.7% of comparisons (53 pairs out of 300) the samples were indistinguishable, whereas for metallic paints this value was 8.5% of such comparisons (37 pairs out of 435). Comparing the spectra using an LR approach was based on variables being the areas under the most significant Raman spectra bands of pigments present in the analysed samples. Proposed LR models delivered low false positive and false negative rates (for many models lower than 10%), and the ECE plots confirmed that their performance was much better than visual comparison. Copyright © 2015 John Wiley & Sons, Ltd.