ERES—ET计算机设计的模拟验证环境

介绍在ERES－寄存器级描述语言的基础上开发的ERES－ET计算机设计的模拟验证环境。该系统已用于RISC机与新型计算机的设计验证，并用于计算机辅助教学。     

基于事务形式验证(TBFV)及8051的TBFV模型

提出了一种基于事务的形式验证方法(TBFV)，为待验证的系统构造功能验证模型，每个模型包括指令序列、输入变量、输出变量、输出函数、输出判定函数．这些可用Kripke结构来描述．这些功能验证模型实现了特定的事务，从而可以将一般的验证要求映射为具体的实现属性．这样，验证者无需了解设计的细节，可在较高层次上对系统行为进行验证．为了证明该方法的效率，分别用该方法和传统的形式验证方法验证了8051的RTL实现．8051中所有的指令都进行了验证，并给出了相应的功能验证模型．实验结果表明，采用该方法可大大节省验证工程师的时间．功能验证模型和验证指令可以在其他设计中复用．     

CPU系统级验证平台的研究与实现

随着CPU设计尺寸和设计复杂度的不断增加，功能验证已经成为整个设计过程中的严重瓶颈，文章回顾了系统级验证的一些技术，针对我们设计的64位CPU系统级验证，设计了CPU系统级自动化验证平台．实用表明，该平台简化了验证流程，提高了验证效率．     

一种基于覆盖率的功能验证方法

针对功能验证的特点，在传统功能验证的基础上，引入覆盖率作为验证程度的反馈信息，从而有针对性地完善了验证环境，提高了验证程度．并以一款8位MCU为例，介绍了基于覆盖率的功能验证方法的具体实现．     

一种基于UVM面向RISC CPU的可重用功能验证平台

以UVM验证方法学和UVM1.1标准库为基础建立验证环境, 按照面向方面的模式分离功能、时序和结构属性, 设计参考模型, 在事务级利用知识库自动产生高功能覆盖率效果的测试用例。面向RISC CPU的功能验证实现领域重用, 以PKU-DSPII为例建立完整的验证平台。实验结果表明, 可重用性得到大幅提升, 且测试用例的覆盖率效果提升约7%。     

操作系统形式化验证综述

介绍操作系统验证理论、语言和工具等技术基础,阐述验证路径、精化关系验证和大规模验证等新的验证方法和理念。比较分析多个操作系统验证项目研究内容、验证方法、主要贡献以及最新进展。分析操作系统验证过程中存在的问题,认为验证成本高、验证工具局限性是制约操作系统形式化验证的关键因素,随着验证工具、框架和定理库的完善,以及深度学习等新技术的应用,操作系统更多的安全性质能够被形式化验证。     

基于均衡7×2交叉验证的模型选择方法

交叉验证策略广泛应用于分类问题的模型比较和模型选择中．文章提出一种均衡7×2交叉验证并给出了相应的构造方法．文章以分类回归树（CART）为考察模型,对比了采用均衡7×2交叉验证、组块3×2交叉验证、标准5折和10折交叉验证在模型选择中的性能．模拟结果表明,在小规模数据集上,均衡7×2交叉验证方法选择到真模型的概率明显高于其余三种交叉验证的选择方法．     

应用于32位嵌入式系统的中断控制IP的裁减设计

C＊Core是32位RISC嵌入式微处理器核．对应用于C＊Core的中断控制IP核进行了裁减和验证，分析了与C＊Core的兼容性，并应用于变频器控制SoC的设计中．新的设计减少了使用的晶体管数量，降低了功耗及成本．     

关于软件形式化方法

简要回顾了形式化方法的发展历程，阐述了形式化方法的定义，重要性及主要研究内容，着重讨论了形式规约语言和方法，以及演绎证明和模型检测等形式验证方法。     

一种面向复杂场景的彩色图像人脸检测方法

针对复杂场景的需要，提出了一种适用于复杂场景的彩色图像人脸检测方法．首先通过综合考虑肤色的亮度和色度信息提高了现有的肤色模型准确率，然后基于颜色和形状特征给出了一种有效的人脸候选区域定位方法，最后针对现有特征验证方法的不足，提出了一种基于人脸像素梯度阈值的验证方法对人脸进行确认．试验表明这种方法是有效的，鲁棒的．     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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