2,460 research outputs found

    Characterization of long-term natural outcome of chronic hepatitis B virus infections

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    慢性乙型肝炎病毒感染是世界重要的公共卫生问题,可以导致肝癌、肝硬化等终末期肝病,继而导致死亡。我国是慢乙肝高流行区,全国约有1.2亿的慢性HBV携带者,慢性乙肝患者约3000万例,HBV感染对我国国民健康造成严重威胁。本研究的主要目的在于研究自然人群慢乙肝感染者的长期转归及其相关因素,监测乙肝相关肝硬化和肝癌的发病率,并且研究成人接种乙肝疫苗对其新感染的保护以及终末期肝病发生的影响。有助于更加深入的了解和认识乙肝,并为预防和预测乙肝相关终末期肝病提供重要的数据和依据。 本研究利用本实验室前期研发的戊型肝炎疫苗的三期临床试验,在江苏省东台市建立了一个自然人群的随访监测研究队列。其中我们对446...Chronic HBV infection is a major public health problem in the world which can lead to liver cancer, cirrhosis, end-stage liver diseases, and death in the end. China is a HBV high prevalence area with about 120 million chronic HBV carriers and 30 million cases of chronic hepatitis B patients. HBV infection is a serious threat to our public health. The main purpose of this study is to investigate th...学位:医学硕士院系专业:公共卫生学院_流行病与卫生统计学学号:3272013115055

    Identifying DNA-binding Proteins Based on Feature Construction and Feature Selection

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    DNA结合蛋白在分子生物学中扮演重要角色,其影响基因表达调控、DNA复制等活动。然而以生物实验的方式识别DNA结合蛋白,耗时且昂贵。数据分析的方式已成为识别DNA结合蛋白的重要途径。为提高DNA结合蛋白的识别性能,针对蛋白质序列数据特点,研究DNA结合蛋白识别问题中的特征工程,包括特征构造与特征选择。该特征工程能有效提高DNA结合蛋白的识别性能,为识别DNA结合蛋白提供了一种简便、高效的方法。论文主要包括以下几个方面。 1)特征构造:针对DNA结合蛋白序列之间低相似性、独立性、序列长度不同等特点,本文从物理化学特性、混沌游戏表示、分形维数、位置特异性得分矩阵和频谱分析五种不同角度的特征构造方...DNA-binding proteins play a vital important role in molecular biology, it has an impact on genes regulation, DNA replication and so on. However, DNA-binding proteins identified by experimental techniques, which are time-consuming and expensive.The method of data analysis has been becoming animportant way to identify DNA-binding proteins.In order to improving the identificationperformance, the feat...学位:工学硕士院系专业:航空航天学院_工程硕士(控制工程)学号:2322014115336

    Goal Interdependence for Promoting Firm Innovation and New Product Development Performance: The Mediating and Moderating Effects

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    近年来,随着中国经济新常态的逐步推进,大众创业、万众创新成为促进中国经济新增长的“双引擎”之一。技术和产品生命周期的进一步缩短,成为企业面临的外部环境新特征。在这样的环境中,企业能否稳固市场地位并实现可持续发展,主要取决于企业对技术和市场动荡进一步加剧的外部环境的适应能力。而应对环境变化带来的挑战的重要途径,就是积极开展技术创新,使企业在研发、生产和营销等方面具备整合性的优势能力,从而比竞争对手更高效持续地开发出满足市场需求的新产品,取得企业绩效。为达到这个目的,企业单纯依靠自身资源,显然无法满足发展需要,它必须朝着更高效、更开放、更合作的方向发展。 上下游企业之间频繁的资源交换,使得供应链...Along with the development of the ‘new normal’ of China’s economy, encouraging people to do business creatively and driving innovation became one of the ‘double engines’ for promoting economy growth. More than ever before, this encouragement inevitably furthers the shortening of technology life cycle and product life cycle. Under such a circumstance, coping with technological turbulence and market...学位:管理学博士院系专业:管理学院_企业管理学号:1762013015375

    Design and Implementation of Smartphone Bus Information Query System Based on Android Platform

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    随着我国城市化经济的飞速发展,公共交通在这一进程中的作用越来越重要。目前, 我国城市公共交通的线路和站点越来越多,逐渐形成了一个复杂的公共交通网络。然而, 正是因为公交网络的复杂,导致人们无法快速选择合适的公交线路。因此需要一个公交查 询系统来帮助公交乘客快速选择适合出行需求的路线,以节约时间及费用成本。目前虽然 已经存在一些公交信息查询系统,但大多数需要通过电脑网页来查询,用户体验方面还不 是特别优秀。国内手机普及率几乎达到100%,因此开发出一款基于智能手机的公交信息查 询系统,对公交乘客来说可用度非常高。 论文调研了目前手机应用程序和公交信息查询的系统,发现这些公交信息查询...With the rapid development of urbanization in China, the role of public transport in this process is becoming more and more important. At present, the number of city public transportation lines and the stations is growing rapidly, and is gradually becoming a complex public transport network. However, precisely because of the complexity of the public transport network, people can not choose the...学位:工程硕士院系专业:软件学院_工程硕士(软件工程)学号:X201323174

    Diagnosis and Treatment of Strategy Execution in Company E on Balance Score Card Perspective

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    笔者选取所任职的这家典型的通信网络服务企业,将企业在战略执行过程中遇到的问题罗列出来,并分析了问题形成的原因,最后着力针对案例公司在战略执行过程中遇到的问题提出了基于平衡计分卡视角的解决办法:第一,启动由高层管理团队参与并主导的战略沟通;第二,成立若干指标开发小组着手建立平衡计分卡系统,实现由战略向部门绩效、个人绩效的转化;第三,成立专门小组主导战略执行循环过程为和勤公司保持竞争优势、保证公司战略得以实现提供可供借鉴的改善对策,并客观的估计了战略执行初期所面临的潜在挑战及应对策略:例如企业的资源分配应全力支持战略执行的各项行动、各部门之间的协同力将成为战略执行过程中的有力保障、战略实施情况及成...Writer inauguration of the correspondence network profession belonged to by business enterprise is Chinese new century of newly arisen with support lord industry, carry out aspect to face a huge challenge in the strategy, correspond by letter external industry environment of network profession sharply worsen, add of our country correspondence network profession oneself of risk control consciousnes...学位:管理学硕士院系专业:管理学院_工商管理硕士(高级管理人员工商管理硕士)学号:X201115607

    Bayesian Inference for Nonlinear DSGE Model via Multiple-try Metropolis Algorithm

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    本文提出一种改进的多重尝试Metropolis算法,用于非线性动态随机一般均衡模型的贝叶斯参数估计和模型选择。多重尝试策略通过每次迭代抽取多个尝试点的方法来提高算法的混合速率,新方法中提出使用近似的方法提高计算速度,并通过接收概率调整偏差。数值实验表明新方法在相同的计算时间内具有更高的估计效率。最后,本文比较了具有不同货币政策设定的模型对中国经济数据的拟合效果,发现中国数据更加支持具有时变通胀目标的模型。This paper proposes a multiple-try-based Metropolis algorithm for Bayesian parameter estimation and model selection in nonlinear dynamic stochastic general equilibrium( DSGE) models. Multiple-try method generates multiple trial points in each iteration to achieve faster mixing rate. The new approach proposes to use approximation to save computational cost,the approximation bias is adjusted through the acceptance rate. Simulation results demonstrate effectiveness of the proposed algorithm. The algorithm is applied to estimate DSGE models with different monetary policy settings using the macroeconomic data of China. It shows that the data favors the model with time-varying inflation target.国家自然科学基金项目“状态空间模型参数的高效序贯蒙特卡洛估计及在金融中的应用”(11101341)的资

    The Impact of Cooperative and Competitive Goals Interdependence with Supplier on Firm Innovation and NPD Performance

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    基于合作与竞争理论探讨企业与供应商之间目标关联影响企业创新和新产品开发绩效的作用机制。运用结构方程模型对233家企业数据进行分析,结果表明:合作目标通过推动供应商整合促进探索式创新和利用式创新,进而增强核心能力并最终提高新产品开发绩效;相反,竞争目标通过抑制供应商整合阻碍探索式创新和利用式创新,进而减弱核心能力并最终降低新产品开发绩效。Based on the theory of cooperation and competition,this paper tests the path effects of cooperative and competitive goals on firm innovation and new product development( NPD) performance through supplier integration and core competence.And then,it analyzes the data of 233 firms by structural equation model. Results show that supplier integration is strengthened by cooperative goals rather than competitive goals. Supplier integration has a positive impact on exploratory innovation and exploitative innovation which do benefit to core competency. These relationships in turn result in NPD performance.国家自然科学基金项目(71572164;71463049);; 教育部人文社会科学规划基金项目(14XJJA630001

    Research on Strategies and Paths of the Development of China's Microinsurance

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    随着经济的不断发展,保险业以它特有的分散危险、经济补偿基本职能,无可争议的成为整个金融业三大支柱之一。然而自商业化以来,在利润的驱使下,其市场定位一直偏重于收入稳定、相对富裕的群体,反而忽视了最需要危险分摊的弱势民众,对保险制度本身无疑是巨大的讽刺,因而当小额保险在一些发展中国家成功推广时,这种以中低收入者为市场定位的保险创新很快受到了各国政府和业界学者的关注,一时如何发展小额保险成为保险业界关心的重要话题。本文采用定性与定量相结合的分析方法,在对国外小额保险发展情况进行深入分析的基础上,结合我国保险业现状,以探讨适合我国小额保险的发展路径。 首先,从小额保险的定位和概念入手,对小额保险的目...With the continuous development of economy, the insurance has undisputed been one of the three pillars of the whole financial industry with its unique basic functions of risk-sharing and loss compensation. However, since it was commercialized, driven by profit, its market-positioning has always been focusing on people with stable revenue and relatively rich group, but the vulnerable persons, who n...学位:经济学硕士院系专业:经济学院金融系_保险学学号:1562006115105

    略论建立我国产业损害预警机制

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    目前,我国的出口产品已成为世界各国反倾销的重点目标,与此同时,国外的某些商品却在我国内地大肆倾销,使得国内某些企业甚至全行业都濒临险境。建立、启动和完善我国产业损害预警机制势在必行

    欧盟新贸易壁垒对我国出口贸易的影响

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    自2004年起,欧盟成为了我国最大的贸易伙伴,发展与欧盟的贸易有着十分重大的意义。中国与欧盟的贸易不断扩大的同时,也遇到来自欧盟内诸多贸易壁垒的限制。本文探讨欧盟的新贸易壁垒对我国出口贸易的影响,为我国在现阶段如何应对提供政策定位及对策思路
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