福建省信息经济学学科发展报告

信息经济学是信息科学的一个分支学科,是一门研究信息的经济现象及其运动变化特征的科学。该文从信息经济学学科和实际发展两个角度,梳理国内外信息经济学科发展现状,分析福建省信息经济的发展趋势,重点阐述福建省信息经济技术研发、平台建设、产业发展以及相关政策措施等方面的进展,并针对福建省信息经济发展存在的问题,提出相应的对策建议

Soft magnetic properties and high frequency characteristics of Fe-O nanocrystalline alloy films

采用等离子体增强射频磁控溅射沉积方法,在室温下制备了fE-O合金薄膜。研究了氧的掺杂量和薄膜厚度对薄膜软磁和高频特性的影响。结果发现少量氧的掺杂不导致低饱和磁化强度铁氧化物的形成,但可使薄膜晶粒细化,矫顽力下降。在薄膜厚度低于150nM且氧气与氩气相对流量比为2.4%的条件下,薄膜的实部磁导率高达1100且能够维持到1gHz.The effect of oxygen-doping and thickness has been studied on soft magnetic properties and high-frequency characteristics of Fe-O alloy thin films prepared by a helicon-plasma-enhanced RF magnetron sputter-deposition at room temperature.A reduction in coercivity due to grain refinement was achieved using very low dose of oxygen which did not lead to the formation of crystalline Fe oxides with the low saturation magnetization.The real part(μ')of permeability has a high value of 1100 and is maintained up to 1 GHz below 150 nm for the relative O 2 flow ratio of R O 2 = 2.4%

Soft magnetic properties and high frequency characteristics of Fe-O nanocrystalline alloy films

[中文文摘]采用等离子体增强射频磁控溅射沉积方法,在室温下制备了Fe-O合金薄膜。研究了氧的掺杂量和薄膜厚度对薄膜软磁和高频特性的影响。结果发现少量氧的掺杂不导致低饱和磁化强度铁氧化物的形成,但可使薄膜晶粒细化,矫顽力下降。在薄膜厚度低于150nm且氧气与氩气相对流量比为2.4%的条件下,薄膜的实部磁导率高达1100且能够维持到1GHz.[英文文摘]The effect of oxygen-doping and thickness has been studied on soft magnetic properties and high-frequency characteristics of Fe-O alloy thin films prepared by a helicon-plasma-enhanced RF magnetron sputter-deposition at room temperature.A reduction in coercivity due to grain refinement was achieved using very low dose of oxygen which did not lead to the formation of crystalline Fe oxides with the low saturation magnetization.The real part(μ )of permeability has a high value of 1100 and is maintained up to 1 GHz below 150 nm for the relative O2 flow ratio of RO2= 2.4%

Research on the Techniques of Deep Convolutional Neural Networks and its Application to Face Analysis

人脸分析是当前计算机视觉、模式识别和机器学习等领域的热门研究课题之一，得到了广泛的关注。人脸分析主要通过人脸图像来分析出人脸的各类信息，如：人脸身份、人脸表情、人脸年龄、人脸性别等。人脸分析在智能人机交互以及身份认证等领域中具有重要的研究意义和实际应用价值。但是由于人脸图像中存在着巨大的可变性，人脸分析问题面临着许多的挑战。另一方面，深度学习是近年来一个非常热门的研究课题，其通过大量的数据，自动地从数据中提取有效的特征表示，并用于后续的分类、回归等任务。这其中深度卷积神经网络已经在图像识别、语音识别、自然语言处理等领域展开了深入的研究并取得了良好的性能表现。因此，研究利用深度卷积神经网络技术进...Face analysis is one of the hottest research topics in computer vision, pattern recognition and machine learning, which has received widespread attention. Face analysis is mainly to analyse a person’s all kinds of information by using the face images, including the identity of the face, facial expression, ages, gender and so on. Face analysis has important significance and practical value in human...学位：工学硕士院系专业：信息科学与技术学院_计算机科学与技术学号：2302013115315

Recent Advances on Deep-Learning-Based Face Analysis

近年来,基于深度学习的人脸分析取得了巨大的进步,成为计算机视觉领域最为活跃的研究方向之一.为了进一步推动深度学习和人脸分析的研究,结合近年已发表; 的相关文献,对基于深度学习的人脸分析技术进行综述.首先,简要概述深度学习及其发展历史,并分析深度学习有效性原因.然后,按照任务目的的不同,将人脸; 分析分成了人脸检测、人脸关键点检测、人脸识别、人脸属性识别等任务进行详细的介绍和讨论,重点分析各种任务现阶段存在的主要问题.接着,介绍人脸分析中; 常用的人脸数据库.最后,讨论深度学习和人脸分析面临的主要挑战,并给出结论.In recent years,the face analysis based on deep learning has made great; progress,and has become one of the most active research areas in the; field of computer vision.In order to further promote the study of deep; learning and face analysis,this paper overviews recent advances on the; deep-learning-based face analysis techniques in the literature.First,a; brief overview of deep learning and its history are given and reasons; for the effectiveness of deep learning are also analyzed.Then,according; to different objectives,four face analysis tasks,i.e.,face; detection,facial key-point detection,face recognition,face attribute; recognition,are introduced and discussed in detail,and the key problems; existing in these tasks at present are analyzed.After that,the commonly; used face databases in the face analysis are described.At last,main; challenges of face analysis based deep learning are shown and the; conclusion is presented.国家自然科学基

a key escrow scheme for restoring invalid escrow agency

提出一种新的密钥托管方案,可以在某一托管代理不可信时,由其它托管代理和KEC联合恢复该托管代理的密钥碎片,保证系统正常工作.本方案利用数字签名,防止对RSA的选择密文攻击

PAHs’Dist ribution and Source Analysis in Surface Sediment s of the Meizhou Bay

[摘要]：2000 年10 月在湄洲湾海域6 个站位采集表层沉积物样,采用GC/ MS 法分析其多环芳烃的含量. 结果显示: 在这些沉积物样中,美国环保署优控的16 种多环芳烃的含量分布较为均匀,其范围为196. 7～299. 7 ng/ g ,平均值为 256. 1 ng/ g ;显著低于长江口、珠江口及其欧美主要港口表层沉积物中多环芳烃的含量. 对多环芳烃特征组分的比值 (菲/ 蒽比值,荧蒽/ 芘比值) 及16 种多环芳烃中四、五和六环总含量的百分比的分析表明:湄洲湾表层沉积物的多环 芳烃主要来源于燃料的高温燃烧.[Abstract]:The Meizhou Bay , located in the mid2east coast of Fujian , China , is a semi2enclosed narrow bay st retching deep into the inland with favorable hydrological circulation conditions. With the const ruction of port s , oil2refinery works and power indust ry in the coastal area ,PAHs’pollution is a potential environmental risk factor in this marine environment ,but no data of PAHs level in this marine environment were established before. The aim of this study is to examine PAHs’dist ribution in the surface sediment s and analyze their sources in the Meizhou Bay. The data showed that : PAHs’concent rations in the surface sediment s were f rom 196. 7 ～ 299. 7 ng/ g and average value was 256. 1 ng/ g. The result s revealed that PAHs’pollution in the sediment was similar. The result s also showed that sediment PAHs in the Meizhou Bay were much lower than those in the Pearl River Delta and the Yangtze River Delta and the major harbors in America and Aust ralia ; but higher than that in the surface sediment s of White Sea. Ratio values of specific PAH compounds such as phenanthrene/ anthracene and fluoranthene/ pyrene were calculated to evaluate the possible source of PAHs contamination in the surface sedi2 ment s of the Meizhou Bay ,the percentage of 4 + 5 + 6 rings of PAHs in total was also used to indicate PAHs’ possible sources. The result s suggested that the surface sediment s might mainly have pyrolytic input s of PAHs.国家自然科学基金(A20077023 ,C40106012) 资

页岩气开采中的若干力学前沿问题

页岩气的开采涉及破裂和收集输运两个关键过程.如何实现2000 m以下、复杂地应力作用下、多相复杂介质组分的页岩层内网状裂纹的形成,同时将孔洞、缝隙中的游离、吸附气体进行高效收集,涉及到诸多的核心力学问题.这一工程过程涵盖了力学前沿研究的诸多领域:介质和裂纹从纳米尺度到千米尺度的空间跨越,游离、吸附气体输运过程中微秒以下的时间尺度事件到历经数年开采的时间尺度跨越,不同尺度上流体固体的相互作用,以及压裂过程中通过监测信息反演内部破坏状态等.针对近年来我们国家页岩气勘探开发工作所取得的成就及后续发展中面临的前沿力学问题,在综合介绍页岩气藏的基本特征和开发技术的基础上,以页岩气开采中的若干力学前沿问题为主线,从页岩力学性质及其表征方法、页岩气藏实验模拟技术、页岩气微观流动机制及流固耦合特征、水力压裂过程数值模拟方法、水力压裂过程微地震监测技术、高效环保的无水压裂技术等6个方面的最新研究进展进行了总结和展望,结合页岩气藏开发的工程实践,深入探究了其中力学关键问题,以期对从事页岩气领域的开发和研究的从业人员提供理论基础,同时,该方面的内容对力学学科、尤其是岩土力学领域的科研工作也具有重要指导价值