455 research outputs found

    Research on the Co-movement between CNY and CNH

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    与大陆地区的在岸市场相比较,香港的离岸市场属于自由市场,没有受到严格的官方管制,更加充分地反映了人民币外汇市场的供给与需求,是人民币汇率的重要市场参考信号。随着在岸市场汇率市场化改革的推进,人民币在岸市场汇率形成机制也有所变化,两个市场汇率之间的互动关系也在不断发生变化。在人民币实现国际化的进程中,资本账户自由度的增进使得跨境资本流动日益频繁,离岸市场交易规模不断扩大,离岸市场对在岸市场的影响更加深远。因此,人民币汇率政策已不能再忽视两个市场的联动性影响。 本文将重点研究人民币在岸市场汇率与香港离岸市场汇率联动性。本文选取了2012年5月2日至2016年1月12日的CNY即期汇率、CNH即期...Compared to onshore market, Hong Kong's offshore market is a free market. It’s not heavily regulated, therefore, the offshore market fully reflects the information of market’s supply and demand. It’s an important market signal of RMB’s exchange rate. As Market-oriented exchange rate mechanism is improving. The onshore market mechanism of RMB’s exchange rate is changing. So the co-movement between ...学位:经济学硕士院系专业:经济学院_国际金融学学号:1562013115211

    The Research on the Economic and Financial Effects of Policy Uncertainty and Its Transmission Mechanism

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    自2008年全球金融危机以来,各国政府为促进经济的复苏纷纷进行了一系列政策变革。然而,在过去的8年多时间里,世界经济复苏的速度远低于预期。基于此,国内外学者开始探讨政策不确定性是否对经济的复苏产生阻碍作用。国外急剧上升的政策不确定性既源于大规模的政策变革,也受到英国脱欧和特朗普当选美国总统等超预期经济政治事件的影响。作为全球第二大经济体的中国,必然受到来自国外政策不确定性的溢出效应。与此同时,中国经济结构转型中的政策方案调整进一步加剧了国内政策不确定性的程度。 基于此,本文以政策不确定性引发的经济金融效应及其传导机制作为研究课题,在以下几个方面展开了深入的研究,并给出了理论和实证分析结果。 ...Since the global financial crisis in 2008, governments have embarked on a series of policy changes to promote economic recovery. However, in the past eight years, the world economy recovers much more slowly than expected. On this basis, concerns about whether policy uncertainty contributed to slow recoveries have intensified. The sharp rise in foreign policy uncertainty is due not only to large-sc...学位:经济学博士院系专业:经济学院_金融学学号:1562014015406

    Can “Investor-Pay” Model Really Improve the Rating Quality of Rating Agencies? —— The Empirical Evidence Based on China Bond Rating Co., Ltd.

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    近年来,我国债券市场信用风险不断暴露。2014年,“11超日债”发生利息兑付违约,成为我国首例正式违约的公募债券。早在2014年以前,评级市场已是乱象丛生——“以级定价”、“以价定级”的现象时有发生,“发行人付费”模式得到了广泛质疑。在这种背景下,作为中国首家采用“投资人付费”模式的信用评级机构——中债资信评估有限责任公司于2010年在北京成立。一方面,随着我国债券违约步入常态化,信用评级的作用不再是“纸上谈兵”;另一方面,中债资信的设立为研究付费模式对评级机构的影响提供了条件。因此,“投资人付费”模式能否真正提高评级机构的评级质量值得研究。 本文选择A股上市公司中2010年至2015年被中...In recent years, the credit risk of Chinese bond market constantly exposed. In 2014, the bond of Chaori issued in 2011 failed to pay the interest, to become Chinese first default bond which was public offered. As early as 2014, the rating market has been chaos, and the issuer-pay model has been widely questioned. In this context, China Bond Rating Co., Ltd (CBR) which was the first one to use the ...学位:管理学硕士院系专业:管理学院_财务学学号:3212014115067

    Biological N2 fixation in the China marginal seas

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    本研究通过11个航次的调查、采样及分析,首次基于15N2示踪法系统地研究了中国边缘海区(北部湾、南海北部海域、东海和南黄海)的生物固氮作用,揭示了生物固氮速率的时空分布特征,阐明了生物固氮作用对生物生产力的贡献;结合物理(温度、盐度)、化学(N、P、Si营养盐)等相关要素的分布,探讨了生物固氮作用可能的调控机制;计算了海区年固氮通量,并将此通量与海区其他新N源输入、全球海洋固氮通量进行比较,评估海区生物固氮作用对新N输入的贡献;结合表层水颗粒物δ15N数据,探讨了应用颗粒物15N组成示踪生物固氮作用的可行性;此外,还研究了中国边缘海单细胞固氮微生物的作用及其对海域固氮速率的贡献,考察固氮作用的...Biological N2 fixation in China marginal seas, i.e. the Beibu Gulf, the northern South China Sea, the East China Sea and the southern Yellow Sea was systematically studied using 15N2 tracer assay during 11 cruises. Spatial and temporal distribution of N2 fixation rates and their contribution to biological production was depicted. Physical and chemical factors were taken into discussion to find out...学位:理学博士院系专业:海洋与环境学院海洋学系_海洋化学学号:2242006015333

    Fabrication of middle/low density biochip micromarrayer and research for hydrophilic/hydrophobic biochip substrate

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    生物芯片是指通过微加工工艺同时将大量的探针分子固定到固相支持物上后与标记的样品分子进行杂交配对,通过检测每个探针分子的杂交信号进而实现对细胞、蛋白、核酸以及其他生物组分的准确、快捷、大信息量的检测。它是集物理学、化学、微电子学、机械学和生命科学等相关学科交叉综合的高科技研究课题,是一门既具有重大的学术价值,又同时具有明显产业化前景的快速发展的高新科技学科。随着研究的不断深入,人们发现低密度生物芯片是生物芯片进入临床检测的切入口,因此,作为生物芯片关键部分——点样头也随之进入中低密度的研究。针对国内外现有微阵列制备技术在中低密度存在的一些不足,主要研究内容及结果如下: 1.提出一种新型的、实用...Micromarrays biochips is a exact, quick and high throughout detection of cell, protein, DNA and other bio-constituents by observe hybridize signs of each sample, The sample labelled fluorescence materials hybridize to probe which immobilize on solid substrate by microfabricaton technology. Micromarrays biochips integrate physics, chemistry, microelectronics, mechanics and life science and other co...学位:工学硕士院系专业:化学化工学院化学系_应用化学学号:20042512

    市政债券发债规模的马太效应研究——基于中国省级面板数据的实证分析

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    文章通过研究市政债券发债规模、地方财政收入和地方gdP三者之间的关系,探讨市政债券的马太效应。首先,运用kMV模型建立市政债券发债规模与财政收入的定量关系;其次,运用中国省市的面板数据对财政收入与gdP的关系进行单整检验和回归分析;最后,运用乘数理论确定市政债券与gdP的相关关系。结果表明,市政债券发债规模、地方财政收入和地方gdP三者之间存在的循环促进效应是造成市政债券马太效应的根本原因,并通过三者之间的互动关系确定了马太效应放大因子

    Research of TD-SCDMA Channel Estimation Method and GPPSDR-Based Implementation

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    TD-SCDMA是我国自主提出的第三代移动通信标准,采用了很多先进的关键技术如智能天线、联合检测等,它们的性能在很大程度上依赖于信道估计的精确性。因此,研究TD-SCDMA系统中的上行信道估计方法对TD-SCDMA整个系统实现具有重要的意义。 本文在研究TD-SCDMA信道特性的基础上,详细地分析了TD-SCDMA的信道模型,并给出了TD-SCDMA上行链路信道模型。其次,针对TD-SCDMA标准中的信道估计技术,给出了用于信道估计的接收矢量模型,详细地阐述了TD-SCDMA中的信道估计原理,包括单小区信道估计算法与多小区信道估计算法的原理;在充分分析现有经典信道估计算法的基础上,提出了低代...TD-SCDMA standard is a third generation mobile communication standard that proposed independently by our country.It has milestone significance in our country’s communication history , and combines the advantage of the time division duplex (TDD) with CDMA, makes use of many advanced techniques, such as smart antenna, Joint Detection and so on. But, these key technologies performance rely on the acc...学位:工学硕士院系专业:信息科学与技术学院通信工程系_通信与信息系统学号:2332009115281

    Research on Large Language Models and Its Application in Machine Translation

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    近年来,随着自然语言处理技术的发展和大规模语料库的出现,各类自然语言应用中使用的语言模型规模也越来越大。机器翻译是大规模语言模型的主要应用领域之一,语言模型有助于机器翻译时选择更符合目标语言习惯的翻译项,研究结果表明,语言模型训练语料的增大可以稳定地提高翻译的效果。故海量语言模型成为近年来统计语言模型研究的一个热点。 本文对统计语言模型的重要技术和发展脉络进行了整理和分析,并在此基础上设计并实现了一套海量语言模型训练工具和一组海量语言模型调用接口,并把在GoogleWeb1T语料库上训练得到的海量语言模型应用到机器翻译中。 首先,我们设计并实现了可用于GoogleWeb1T语料库的海量语言...As a result of progress of natural language processing and appearance of large-scale corpus, large-scale statistical language modeling becomes both realistic and necessary. Language Models contribute to the selection of good translation in Machine Translation. Research results show that translation quality indicated by BLEU score improves steadily with increasing language model size. So large lang...学位:工学硕士院系专业:信息科学与技术学院计算机科学系_计算机应用技术学号:2302006115248

    Transcriptional regulation of PEN-2, a key component of the γ-secretase complex, by CREB

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    Gamma-secretase, which is responsible for the intramembranous cleavage of Alzheimer's P-amyloid precursor protein (APP), the signaling receptor Notch, and many other substrates, is a multiprotein complex consisting of at least four components: presenilin (PS), nicastrin, APH-1, and PEN-2. Despite the fact that PEN-2 is known to mediate endoproteolytic cleavage of full-length PS and APH-1 and nicastrin are required for maintaining the stability of the complex, the detailed physiological function of each component remain elusive. Unlike that of PS, the transcriptional regulation of PEN-2, APH-1, and nicastrin has not been investigated. Here, we characterized the upstream regions of the human PEN-2 gene and identified a 238-bp fragment located 353 bp upstream of the translational start codon as the key region necessary for the promoter activity. Further analysis revealed a CREB binding site located in the 238-bp region that is essential for the transcriptional activity of the PEN-2 promoter. Mutation of the CREB site abolished the transcriptional activity of the PEN-2 promoter. Electrophoretic mobility shift assays and chromatin immunoprecipitation analysis showed the binding of CREB to the PEN-2 promoter region both in vitro and in vivo. Activation of the CREB transcriptional factor by forskolin dramatically promoted the expression of PEN-2 mRNA and protein, whereas the other components of the gamma-secretase complex remained unaffected. Forskolin treatment slightly increases the secretion of soluble APP alpha and A beta without affecting Notch cleavage. These results demonstrate that expression of PEN-2 is regulated by CREB and suggest that the specific control of PEN-2 expression may imply additional physiological functions uniquely assigned to PEN-2

    经济政策不确定性与股票风险特征

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    构建了包含经济政策不确定性的随机贴现模型,通过参数校准、静态比较等方法,探讨了不同政策不确定性下股票风险的动态特征.在此基础上,通过实证模拟分析政策不确定性影响股票风险的传导机制,并通过组合分析法检验政策不确定性在股票风险形成中的作用,以此验证该理论模型在中国的适用性.最后,运用面板数据回归模型对政策不确定性与股票风险的关系进行量化分析.结果表明:1)政策不确定性能够通过企业现金流、贴现因子和相关系数等途径提高股票风险,该效应在控制传统风险因子、企业异质性因素和外部环境因素后依然显著;2)具有非国有性质、较低盈利能力和低资产增长率的企业股票更易受政策不确定性的影响;3)在经济萧条和改革幅度较大的阶段,政策不确定性对股票风险的溢出效应显著增强.国家社会科学基金资助项目(16BJL028);;国家自然科学基金资助项目(71771193;71471154);;中国博士后科学基金资助项目(2017M622671
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