Beta-Binomial删除信道中的喷泉码文件传输协议

由于命名数据网络(NDN,Named-Data Networking)无环路、逐包、逐跳转发的特点,使得数据包回传成功率降低,而传统的TCP/IP协议中的ARQ和ACK机制对于多播会话不再适用.由于NDN中的传输信道可以等效为二进制删除信道,因此可以通过应用层编码来实现文件的可靠传输.传统的信道编码技术如卷积码、级联码和RS码等复杂度较高,而将NDN与低复杂度的喷泉码的结合可以实现分布式的存储架构,因而可通过喷泉编码在应用层协议中实现可靠的纠删机制,保证整体文件的传输可靠性.以往的研究一般是基于确定的删除概率信道模型,但是由于网络的异构性和信道噪声等因素影响,可能会造成信道丢包概率呈随机性分布.因此,本文在Beta-Binomial分布模型的前提下,根据贝叶斯统计的先验信息和中心极限定理,对随机概率下的纠删信道的文件可靠传输协议进行了数学建模和理论推导.仿真结果显示此模型更具有普适性,此传输协议可在信道状况未知的前提下从理论上求出最小发包数,减少冗余编码包,提高文件整体的投递成功率,在保证传输可靠性的同时有效提升协议传输效率.     

Compiler compatible 5.66 Mb/mm2 8T 1R1W register file in 14 nm FinFET technology

1-read/1-write (1R1W) register file (RF) is a popular memory configuration in modern feature rich SoCs requiring significant amount of embedded memory. A memory compiler is constructed using the 8T RF bitcell spanning a range of instances from 32 b to 72 Kb. An 8T low-leakage bitcell of 0.106 μm² is used in a 14 nm FinFET technology with a 70 nm contacted gate pitch for high-density (HD) two-port (TP) RF memory compiler which achieves 5.66 Mb/mm² array density for a 72 Kb array which is the highest reported density in 14 nm FinFET technology. The density improvement is achieved by using techniques such as leaf-cell optimization (eliminating transistors), better architectural planning, top level connectivity through leaf-cell abutment and minimizing the number of unique leaf-cells. These techniques are fully compatible with memory compiler usage over the required span. Leakage power is minimized by using power-switches without degrading the density mentioned above. Self-induced supply voltage collapse technique is applied for write and a four stack static keeper is used for read Vmin improvement. Fabricated test chips using 14 nm process have demonstrated 2.33 GHz performance at 1.1 V/25 °C operation. Overall V_min of 550 mV is achieved with this design at 25 °C. The inbuilt power-switch improves leakage power by 12x in simulation. Approximately 8% die area of a leading 14 nm SoC in commercialization is occupied by these compiled RF instances.     

高性能通用DSP寄存器扩展设计实现方法

本文提出一种高性能通用DSP扩展寄存器的设计及实现方法,该方法是我国自主研发的高性能通用DSP中实现寄存器堆扩展的一种新方法,其优点是在不影响现有指令集及指令机器码位宽的前提下,实现对处理器内部寄存器堆的成比例扩展。通过在我国自主研制DSP上的实际应用,证明了该扩展方法的有效性和实用性。     

An E-Business Event Stream Mechanism for Improving User Tracing Processes

With the rapid development in business transactions, especially in recent years, it has become necessary to develop different mechanisms to trace business user records in web server log in an efficient way. Online business transactions have increased, especially when the user or customer cannot obtain the required service. For example, with the spread of the epidemic Coronavirus (COVID-19) throughout the world, there is a dire need to rely more on online business processes. In order to improve the efficiency and performance of E-business structure, a web server log must be well utilized to have the ability to trace and record infinite user transactions. This paper proposes an event stream mechanism based on formula patterns to enhance business processes and record all user activities in a structured log file. Each user activity is recorded with a set of tracing parameters that can predict the behavior of the user in business operations. The experimental results are conducted by applying clustering-based classification algorithms on two different datasets; namely, Online Shoppers Purchasing Intention and Instacart Market Basket Analysis. The clustering process is used to group related objects into the same cluster, then the classification process measures the predicted classes of clustered objects. The experimental results record provable accuracy in predicting user preferences on both datasets.     

理想的坚持者,ONL

何为ONL,谁是ONL,ONL为何成为今天的ONL?怀着对其艺术气质的欣赏,对其设计理念的支持,对其工作方式的理解和对其执着追求的精神的钦佩,从个人角度出发对ONL进行速写。     

浅谈建筑工程"投标书"与"招标书"的写作

随着建筑市场的规范化,建筑经济活动中的招、投标也就愈加频繁。结合建筑应用文中“投标书”与“招标书”的写作,介绍了两种实用文体的特点、制作和格式。尤其对标书的核心主体部分和撰写时应注意的事项作了特别的说明,同时还强调,语言要简洁明了,准确无误,行文语气要诚奶,态度爽明,以更好地适应市场的需要。     

智能变电站监控系统防止电气误操作功能的实现

在智能变电站中,应用IEC 61850标准进行信息交互,按站控层、间隔层、过程层设置防误闭锁功能,可以提高操作的可靠性,简化二次系统设计。研究在智能变电站监控系统中实现防误操作的实现方案,提出了变电站三层防误闭锁功能的系统架构,研究并改进了IEC 61850关于防误闭锁功能的通信接口,并提出了一套防误操作规则的表示方法。     

基于自动测试系统的测试数据格式标准化研究

为克服因不同自动测试系统生成测试数据不统一,所造成测试效率低下和成本浪费的问题.根据ATE统一测试数据标准格式STDF文件的规范,分析其内部各个模块的处理方法,使用LabWindows/CVI软件环境,设计了一种转换程序,通过算法完成了二进制文件STDF与文本文件的双向转换,通过对比转换生成的文本和标准ATD文本,验证了程序转换结果的正确性,最后将转换程序植入国产自动测试系统BC3192V50,从而实现测试数据标准化.测试实验结果表明,该算法能够高效的实现双向转换,规范了测试数据的结构,提升了测试数据的可分析性.     

3D打印数字人像快速成型技术的研究与实现

自动获取人像数据并高精度重建是三维人脸识别的研究热点。针对三维重构缺少成熟算法与有效应用方法的问题,提出了一种基于二维数据的三维打印数字人像快速成型方法。该方法采用二维照相的方法获取人像的正视图、侧视图和俯视图,使用MAYA软件对人像数据进行网格化处理,生成OBJ文件导入PROE生成三维实体,并导入JDpaint实现数控仿真加工,最后将STL文档导入打印机打印出三维人像。实验证明,该方法实现了数据获取、网格划分、曲面重建和快速成型的整个工作流程。