Research on Key Techniques for PC and FPGA based Software Defined Radio

人们对无线通信服务需求的快速增长，极大促进了无线通信技术的迅速发展。软件无线电是一种用软件来实现信号处理的无线通信系统设计方法，基于通用处理器的软件无线电以其可重配置性、扩展性、低成本和灵活性等各种优势成为未来无线通信系统的主流设计方法之一。 在基于通用处理器的软件无线电系统中，通常采用可编程逻辑门阵列(FPGA)与个人电脑(PC)相结合的架构。由于目前通信系统中往往需要处理宽带、多频带、多模式信号，这就要求模数转换器(ADC)具有较高的采样率，为了克服数字信号较高采样率给后续基带处理带来的压力，具有灵活、可配置功能以实现灵活的采样率变换及滤波操作的数字前端就成了本论文研究的关键技术之一；而...People’s rapid growth demand for wireless communication services has greatly contributed to the rapid development of wireless communication technologies. Software defined radio (SDR) is a type of design method to implement signal processing by software for wireless communication systems. Due to the advantages of its re-configurability,scalability, low cost and flexibility, General-purpose processo...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：2332008115329

The Developmental Strategy Study on XiaMen ShuangRui Ship Coatings Company

本文为厦门双瑞船舶涂料有限公司发展战略研究报告。中船重工七二五研究所厦门分部在经历一个快速发展时期后，吸收社会优势资源，组建成厦门双瑞船舶涂料有限公司。本文试图从剖析该公司从事业单位转制面临的一系列问题入手，分析该企业赖以生存和发展的外部环境和与国内外同行在市场竞争中的优劣势，进而确定企业的战略目标及提出企业的具体战略，最后，提出一些确保战略有效实施的措施。本文共分五章，各章主要内容如下：第一章：公司简况。简要介绍公司组建时其主体七二五所厦门分部的现状，侧重于分析厦门分部从事海洋工程防腐涂料的经营情况和各阶段的发展特征。第二章：行业前景及竞争结构分析。本章主要从我国船舶涂料行业的发展情况、面临...The paper is the report of developmental strategy study on XiaMenShuangRui Ship Coatings Company. After having gone through one rapid developmental stage, XiaMen Branch of No.725 Research Institute adsorbed social super resources to set up XiaMenShuangRui Ship Coatings Company. This paper tries to start with anatomizing a series of problems confronted in the course of institutional transformation ...学位：工商管理硕士院系专业：管理学院工商管理教育中心_工商管理硕士(MBA)学号：X20021506

An Empirical Study of Earnings Management Based on Real Activities Manipulation——Empirical Evidence from Chinese Listed Companies

以中国上市公司A股2002~2011年的数据为样本,对上市公司的真实盈余管理行为进行了实证研究。研究发现,微盈公司显著存在利用应计项目和真实活动进行正向盈余管理的现象,而在新会计准则实施后,微盈公司利用应计项目进行正向盈余管理的程度显著降低,但利用真实活动进行正向盈余管理的程度显著提高,说明新会计准则的实施促使微盈公司转而利用更加隐蔽的真实盈余管理进行利润操控。进一步研究发现,在控制了资产规模、资产回报率、年持有收益率、操控性应计利润及成长性等影响因素后,上市公司真实盈余管理的程度与其后期的业绩表现显著负相关,说明真实盈余管理行为会损害公司的长期价值。This paper empirically examine the real earnings management behavior of Chinese list companies with the data of Shanghai and Shenzhen A-share from 2002-2011.The results show that small profit companies manage earnings upwards significantly by accruals as well as real activities.Small profit companies use less accrual earning management but more real earnings management significantly after the promulgation of new accounting standards.It suggests that the promulgation of new accounting standards urge small profit companies switch to use more covert real activities to manage earnings.The further research shows that real earnings management is negative related to the subsequent operating performance of list companies after we control other influence factors.It suggests that real earnings management will harm companies' long term value.国家自然科学基金资助项目(70972111); 中央高校基本科研业务费专项资金资助项目(2011221035

高管变更与盈余管理——基于应计项目操控与真实活动操控的实证研究

本文将应计项目操控和真实活动操控纳入分析框架,研究上市公司发生总经理变更后的盈余管理行为。理论分析表明,新任总经理在上任当年利用应计项目负向盈余管理可"一举多得",利用真实活动进行盈余管理却可能会"损公不利己";而在后续年度利用真实活动正向盈余管理虽会"损公"却可"利己"。以沪深A股上市公司2005-2010年数据为样本进行的实证检验结果显示,在总经理变更当年,上市公司存在利用应计项目调减利润的盈余管理行为,但不存在利用真实活动的盈余管理行为。在新任总经理上任后第一、二个完整会计年度,上市公司存在利用应计项目和真实活动调增利润的盈余管理行为。总经理变更当年,如果董事长也发生变更,则上市公司在变更当年利用应计项目调减利润的程度更大,在变更后第一、二个完整会计年度利用应计项目和真实活动调增利润的程度也显著更大

Research and Implementation of Soft-Decision Demodulation for 8PSK Based on FPGA

首先分析了8PSk的软解调原理,针对最优的对数似然比(llr)运算复杂度较高的特点,选用了相对简化的最大值(MAX)算法作为可编程逻辑门阵列(fgPA)硬件平台实现方案。随后,通过QuArTuS II仿真平台对8PSk软解调器进行了硬件描述语言(VHdl)的设计实现和功能仿真,并通过与ldPC译码模块级联在AlTErA公司的STrATIX II系列fPgA芯片上完成最终测试。通过与MATlAb仿真结果进行比较,验证上述简化8PSk软解调器设计的正确性和可行性。In this paper,the principle of soft-decision demodulation for 8PSK is investigated,and the simplified Maximum(MAX) algorithm,for its low computational complexity,is selected for the implementation of field programmable gate array(FGPA) instead of the optimal Log Likelihood Ratio(LLR) algorithm.The Verilog hardware description language(VHDL) implementations and functional verifications for 8PSK soft demodulator are then carried out on the QUARTUS II platform.Then the final tests in combination with the LDPC decoder are conducted on the Altera Stratix II FPGA platform.By comparing with the MATLAB simulation results,the correctness and feasibility of the simplified 8PSK soft demodulator are verified

Modeling based on UG Gleason spiral bevel gear

目前国内的齿轮加工专用机床无法加工一些尺寸超过其技术规格的齿轮副,而运用大型的数控加工中心加工弧齿锥齿轮副,齿轮副尺寸不再成为其制约因素。利用UG软件提供的UG/OPEN GRIP二次开发功能,编制相应的锥齿轮成形软件,根据设计图纸提供的格里森弧齿锥齿轮副的基本尺寸和参数,首先建立铣刀盘和弧齿锥齿轮大轮胚体的三维模型,然后结合格里森弧齿锥齿轮机床调整参数,在UG环境下模拟格里森机床调整过程,通过布尔运算得到成形法加工的大轮。之后采用变异的铣刀盘成形加工得到的变异大轮展成小轮毛胚实体,最终得到小轮齿面。此方法基于传统的格里森弧齿锥齿轮加工方法,又有不同之处,是格里森弧齿锥齿轮建模和加工的一种实用新方法。At present the domestic gear processing machine can not machining the gears that exceed the size of the technical specifications, in order to solve this conflict, this large-scale use of the NC processing center of spiral bevel gear, the size of the gear is no longer a constraint. With the UG/OPEN GRIP, we design bevel gear forming software to create the big round of three-dimensional model of the embryo, and complete simulation under UG, then we get the big gear by boolean operation. And a small round hair embryo is born by a variation of facer, finally, we get the tooth surface of the gear. This method is based on the traditional Gleason spiral bevel gear processing methods, also different, which suggest a practical way of a spiral bevel gear modeling and processing by Gleason.福建省重点项目(2006Y0027

Advances in researches of aquatic ectoenzyme and its relationship with red tide

胞外酶在水生生态系统的物质循环和能量转化过程中具有重要作用 ,其研究对深入了解海洋中碳的生物地球化学循环过程及赤潮藻在赤潮发生过程中的应对机制具有重要意义 .本文综述了海水中胞外酶的研究方法、活性分布特征、粒径分布特征、影响调控机制及生态学意义等方面的研究进展 ,同时介绍胞外酶作为一项新型营养状况指标的意义 .Ectoenzymes play an important role in the material cycle and energy conversion in aquatic ecosystem. The researches of ectoenzyme are of significance in further understanding the marine carbon biogeochemical cycle and the countermeasures of algae under bloom conditions.In this paper, the research methods, characteristic activity and size distribution, controlling factors and their ecological significances of algal ectoenzymes were reviewed, and ectoenzyme introduced as one kind of new trophic state index.国家重点基础科研究发展规划资助项目 ( 2 0 0 1CB40 970 6)

社会系统工程与国家治理体系现代化

2014年3月30日,中国人民大学国家发展与战略研究院社会系统工程研究中心成立暨“社会系统工程与国家治理体系现代化“学术研讨会在中国人民大学逸夫会堂第一会议室举行,来自十余所高校和学术团体的专家、学者和一些媒体的代表参加了会议。现把会议主要发言内容选载如下

Researches on Key Techniques for D2D Communications in Heterogeneous Networks

随着移动通信设备数量的不断增长，频谱资源匮乏问题日趋明显，基站负载日益增加，邻近距离通信无时无刻不在身边出现。而设备到设备间的直接通信技术(Device-to-Device，D2D)能给邻近距离业务传输提供更好的用户体验，成为了下一代移动通信网络5G的关键技术之一。与传统的蜂窝通信相比，D2D通信能够为基站(BS)和核心网提供负载分流，具有降低设备功耗，减少传输延时，提高吞吐量等优势，因此广受关注。 D2D通信使得设备间的数据传输可以避开BS而直接在设备间直接进行，并通过复用蜂窝授权频段从而提高频谱利用率，因而成为一种重要的近场通信技术。本文针对蜂窝用户(CUE)与D2D用户(DUE)组成...With the explosive increasement of mobile user equipments, the scarcity of spectrum resource becomes more serious and the burden of base station (BS) is also getting heavier. Meanwhile, the proximity-based communication resides in each place. As a result, D2D communication receives great attentions and becomes one of the promising technologies in 5G networks due to its advantages in proximity-base...学位：工学博士院系专业：信息科学与技术学院_通信与信息系统学号：2332013015427