67 research outputs found

    我国存款准备金率上调临界值模拟分析

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    通过构建向量误差修正模型及联立方程模型,本文有针对性地对我国存款准备金率的上调走势及可能存在的上限临界值区域进行研究,认为通货膨胀对我国存款准备金率上调起到了长期影响及短期效应,这是存款准备金率上调的重要指示器;假定居民消费者价格指数同比增长达到6.5%,我国存款准备金率的上限转折点可能出现在区间22%至23%,而同比增长为7%,上限转折点可能出现在区间22.5%至23.5%

    Estimation and Applications of Varying Coefficient Spatial Econometric Models

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    空间计量经济学是计量经济学的重要学科分支,近年来,其理论不断得到发展和完善,且在经济、管理等领域应用广泛。通常,传统空间计量模型主要以线性参数模型为主,其模型形式往往做了预先设定。然而,在大量现实复杂经济现象中,变量间不仅可能存在线性特征,还极可能存在着非线性特征,单纯在线性框架下进行研究无法捕捉到它们之间真正的回归关系,这也成为参数空间计量模型无法回避的主要局限之一。为了克服上述不足,我们有必要引入半/非参数空间计量模型解决这些问题。 相比传统参数空间计量模型,非参数空间计量模型具备较大的灵活性和稳健性。然而,这类模型对高维数据却有着不可避免的“维数灾难”问题,这在一定程度上限制了模型的应...As one of the important branch courses in the econometrics, spatial econometrics has been continuously developed and broadly used in the domains of economy and management in recent years. Usually, the traditional spatial econometric models are mainly parametric models, and they set the forms of models in advance. However, in the complex economy, there may exist many linear and nonlinear features a...学位:经济学博士院系专业:经济学院计划统计系_统计学学号:1542011015379

    The Impact of the High-Speed Train on Regional Tourism Economy——Evidence from 178 Cities in China

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    交通是目的地旅游经济发展的重要因素。动车的出现改变了传统交通工具背景下旅游者对于时间和空间的感知,缩短了与目的地之间的心理距离,进而对旅游者的目的地选择和旅游业的发展产生影响。 为了探究动车对区域旅游经济的贡献程度以及具体的影响方式,本文建立了时间跨度2007-2013年,覆盖东部和中部178个地级城市的面板数据,采用固定效应模型估计了动车的开通对区域国内旅游收入的影响。结果表明:对于没有开通动车的城市,动车的开通对开通城市国内旅游收入的贡献达5.83个百分点。动车的时间趋势效应表现在动车开通后2-4年内对国内旅游收入的拉动作用最大,5年之后影响逐渐减弱。本文通过计算样本城市的交通综合指数(...Transportation has been recognized as a critical component in regional tourism system. The emerging of high-speed trains in China changes tourists’ traditional perception of time and space, shortens psychological distance between origins and destinations, hence influences tourists’ choice of tourism destinations and the development of regional tourism industry. This paper utilizes an annual p...学位:旅游管理硕士院系专业:管理学院_旅游管理学号:1782013115121

    Testing Spatial Correlation in Semi-parametric Varying Coefficient Regression Models

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    本文对半参数变系数回归模型,构造了新的空间相关性检验统计量,利用三阶矩χ2逼近方法导出了其检验P-值的近似计算公式,蒙特卡罗模拟结果表明,该统计量在检测空间相关性方面具有较高的准确性和可靠性。同时考察了误差项服从不同分布时的检验功效,体现出该检验方法的稳健性。进一步,我们还给出了检验统计量的bOOTSTrAP方法以及检验水平的模拟效果。Based on the semi-parametric varying coefficient regression model,a new testing statistic for spatial correlation is constructed.The corresponding approximation of p-value is derived by employing the third-moment χ2method.The Monte Carlo simulation studies show that the proposed testing statistic has good accuracy and reliability.Meanwhile,we investigate the simulation results of testing powers for different error terms,which show that the testing method has high robustness.Furthermore,the bootstrap method and simulation results for the testing statistic are given.教育部人文社会科学项目“空间自回归单指数模型的理论和实践”(13YJA9100002)的阶段性成

    Nonlinearity Analysis of Phillips Curve in China

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    在对产出缺口进行测算的基础上,本文运用非线性平滑转换回归模型刻画了我国通货膨胀与产出缺口之间的动态非线性关系。研究结果表明:产出缺口对通货膨胀的影响具有典型的非线性特征和非对称性,并且这种影响具有明显的阶段性特征,在1994-1998年和1999-2007年间,线性特征明显;而在1981-1993年和2008年以后,非线性特征明显,且两种特征之间转换频繁。Based on the measurment of output gap,the non-linear smooth transition model is employed to capture the dynamic relationship between output gap and inflation in China.The results show that the influence of Chinese output gap on the inflation rate has the typical non-linear characteristic and the asymmetry;The relationship between them has the obvious gradual characteristic.During 1994 to 1998 and 1999 to 2007,it presented the obvious linear characteristic.However,during 1981 to 1993 and after 2008,the non-linear characteristic is obvious,and the relationship is changing frequently between linearity and non-linearity.国家社科重大基金研究项目“扩大内需的宏观经济政策研究”(08&ZD034);国家社科重点基金研究项目“国家统计数据质量管理研究”(09AZD045); 教育部哲学社会科学研究重大课题攻关项目“中国居民消费价格指数(CPI)的理论与实践研究”(11JZD019)资

    Nonlinearity Analysis of Phillips Curve in China

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    在对产出缺口进行测算的基础上,本文运用非线性平滑转换回归模型刻画了我国通货膨胀与产出缺口之间的动态非线性关系。研究结果表明:产出缺口对通货膨胀的影响具有典型的非线性特征和非对称性,并且这种影响具有明显的阶段性特征,在1994-1998年和1999-2007年间,线性特征明显;而在1981-1993年和2008年以后,非线性特征明显,且两种特征之间转换频繁。Based on the measurment of output gap,the non-linear smooth transition model is employed to capture the dynamic relationship between output gap and inflation in China.The results show that the influence of Chinese output gap on the inflation rate has the typical non-linear characteristic and the asymmetry;The relationship between them has the obvious gradual characteristic.During 1994 to 1998 and 1999 to 2007,it presented the obvious linear characteristic.However,during 1981 to 1993 and after 2008,the non-linear characteristic is obvious,and the relationship is changing frequently between linearity and non-linearity.国家社科重大基金研究项目“扩大内需的宏观经济政策研究”(08&ZD034);国家社科重点基金研究项目“国家统计数据质量管理研究”(09AZD045); 教育部哲学社会科学研究重大课题攻关项目“中国居民消费价格指数(CPI)的理论与实践研究”(11JZD019)资

    1,3-取代吲唑类低氧诱导因子l抑制剂的设计合成及其抗肝癌活性

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    低氧诱导因子l(HIF-1)与肿瘤细胞的生长、侵袭和耐药密切相关,在肿瘤细胞内HIF-1高度表达,因此新型的HIF-1抑制剂可作为潜在的抗肿瘤药物。本文合成了9个1,3-取代吲唑衍生物。通过蛋白质印迹(Western Blot)法及实时定量荧光PCR(Real time-PCR)等方法检测了其对HIF-1及其靶基因血管内皮生长因子(VEGF)表达水平的影响,并以3-(5’-羟甲基-2’-呋喃基)-1-苯甲基吲唑(YC-1)为阳性对照药物初步评价了其体外抗肝癌细胞增殖的生物活性。实验发现化合物7b可显著抑制HIF-1及其下游靶基因VEGF的表达,且体外抗肝癌增殖生物活性优于YC-1,半抑制浓度(IC50)值为10.37μmol/L。研究结果表明,3-(5’-羟甲基-2’-呋喃)-1-(1″-对甲苯磺酰基)吲唑具有靶向抑制HIF及良好的抗肝癌活性作用。福建省科技厅项目(2015Y0081,2015J01350);;厦门大学大学生创新创业训练计划项目(2016X0644,20720152005)~

    人CD4胞外区蛋白在杆状病毒-昆虫细胞系统中的表达纯化及性质鉴定

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    目的:通过条件优化实现人CD4蛋白胞外区在杆状病毒-昆虫细胞表达系统中的高效表达,并对纯化获得的人CD4蛋白胞外区进行抗原性与免疫原性分析。方法:通过选择人CD4分子胞外片段构建重组杆状病毒(p Ac-CD4),然后感染昆虫细胞进行蛋白的表达,采用镍离子亲和层析纯化。运用SDS-PAGE、Western blot、体积排阻色谱、ELISA、SPR法等分析纯化得到目的蛋白的理化性质和抗原性。通过弗氏佐剂与目的蛋白混合免疫BALB/c小鼠,监测小鼠免疫血清的抗体生成。结果:经纯化可获得纯度90%以上的人CD4蛋白,每升细胞培养液最终可获得11.2 mg的目的蛋白,且该人CD4胞外区蛋白具有良好的抗原性。小鼠血清监测结果显示人CD4蛋白能有效刺激机体产生免疫应答,显示其具有良好的免疫原性。结论:本研究通过杆状病毒-昆虫细胞系统进行高效表达,获得抗原性和免疫原性良好的人CD4胞外区蛋白,为HIV受体和感染的研究奠定基础。国家自然科学基金(No.81671645

    HIV-1 CAP2NC蛋白的表达及体外自组装

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    构建并表达HIV-1 CAP2NC蛋白,探索其体外自组装条件。通过PCR技术扩增HIV-1(NL4-3毒株)CAP2NC基因片段,并将其连接到原核表达载体pTO-T7,获得重组质粒pTO-T7-CAP2NC,然后转化至大肠杆菌BL21(DE3)菌株,经疏水层析纯化后获得重组蛋白CAP2NC。SDS-PAGE结果表明,重组蛋白CAP2NC可在大肠杆菌可溶高效表达,经纯化后纯度约为95%。ELISA检测表明重组蛋白CAP2NC可被HIV-1衣壳蛋白特异性单克隆抗体识别,具有较好反应活性。重组蛋白透析后在非原性SDS-PAGE中呈现为多种聚体形式。分子筛排阻层析分析CAP2NC蛋白透析后可进行组装,负染电镜进一步观察显示CAP2NC蛋白在RNA存在条件下,可形成空心管状颗粒,其形态结构与HIV-1病毒衣壳体外自组装形成的类似。上述结果表明HIV-1 CAP2NC蛋白具有体外自组装的性质,为进一步在体外研究非成熟病毒样颗粒结构奠定基础。国家自然科学基金(Nos.81671645,81371818)资助~

    Efficacy, Safety, and Immunogenicity of an Escherichia coliProduced Bivalent Human Papillomavirus Vaccine: An Interim Analysis of a Randomized Clinical Trial

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    HPV是一种常见的生殖道感染病毒,高危型HPV持续性感染能够导致几乎所有的宫颈癌,其中HPV 16型和18型危害最大,可导致约70%的宫颈癌。预防性HPV疫苗有望减少甚至最终消灭由疫苗型别导致的宫颈癌,降低HPV相关的疾病负担。该研究是在全国4个中心5个现场的18-45岁健康女性中进行的多中心、随机、双盲、对照(戊肝疫苗)的三期临床试验,该研究结果证实我校自主研发的双价人乳头瘤病毒疫苗(大肠杆菌)具有良好的安全性、免疫原性和免疫持久性,可有效地预防HPV 16型和/或18型相关的宫颈高度癌前病变及持续性感染。 该论文报告了我校和厦门万泰沧海生物技术有限公司自主研发的双价人乳头瘤病毒疫苗(大肠杆菌)三期临床试验的期中分析结果。这是第一个进入临床试验并提交药品注册申请的国产人乳头瘤病毒疫苗(HPV疫苗),有望成为世界上第四个上市的HPV疫苗,受到世界卫生组织和盖茨基金会等国际组织的高度关注。 中国医学科学院肿瘤医院乔友林教授、我校吴婷教授、广西壮族自治区疾病预防控制中心李荣成主任医师、江苏省疾病预防控制中心胡月梅主任医师、北京大学人民医院魏丽惠教授、中国食品药品检定研究院李长贵研究员、中国医学科学院肿瘤医院陈汶教授为该论文的共同第一作者,我校张军教授、夏宁邵教授和中国医学科学院肿瘤医院乔友林教授为该论文的共同通讯作者。【Abstract】Background The high cost and insufficient supply of human papillomavirus (HPV) vaccines have slowed the pace of controlling cervical cancer. A phase 3 clinical trial was conducted to evaluate the efficacy, safety and immunogenicity of a novel Escherichia coli-produced bivalent HPV-16/18 vaccine. Methods A multi-centre, randomized, double-blind trial started on November 22, 2012, in China. In total, 7372 eligible women aged 18-45 years were age-stratified and randomly assigned to receiving 3 doses of the test or control (hepatitis E) vaccine at months 0, 1 and 6. Co-primary endpoints included high-grade genital lesions and persistent infection (over 6 months) associated with HPV-16/18. The primary analysis was performed on a per-protocol susceptible population of individuals who were negative for relevant HPV type-specific neutralizing antibodies (at day 0) and DNA (at day 0 through month 7) and who received 3 doses of the vaccine. This report presents data from a pre-specified interim analysis used for regulatory submission. Results In the per-protocol cohort, the efficacies against high-grade genital lesions and persistent infection were 100.0% (95% confidence interval [CI] = 55.6% to 100.0%, 0/3306 in the vaccine group vs. 10/3296 in the control group) and 97.8% (95% CI = 87.1% to 99.9%, 1/3240 vs. 45/3246), respectively. The side effects were mild. No vaccine-related serious adverse events were noted. Robust antibody responses for both types were induced and persisted for at least 42 months. Conclusions The Escherichia coli-produced HPV-16/18 vaccine is well tolerated and highly efficacious against HPV-16/18 associated high-grade genital lesions and persistent infection in women.This work was supported by grants from the Chinese National High-tech R&D Program (863 program, 2012AA02A408), the Chinese National Major Scientific and Technological Special Project for “Significant New Drug Development” (2018ZX09308010 and 2012ZX09101316), the National Natural Science Foundation of China (81673240 and U1705283), the Fujian Provincial Major Scientific and Technological Project (2015YZ0002), the Chinese Academy of Medical Sciences Innovation Fund for Medical Sciences (CIFMS, 2017-I2M-B&R-03, and 2016-I2M-1-019) and Xiamen Innovax. 该研究获得了国家高技术研究发展计划(863计划)、新药创制国家科技重大专项、国家自然科学基金、福建省科技重大专项、中国医学科学院医学与健康科技创新工程基金以及厦门万泰沧海生物技术有限公司的资助
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