层次版图连接关系提取

本文提出了一种新的层次版图连接关系提取算法,其利用投影法和版图倒序树(Inverse Layout Tree,简记为ILT)构建同一原始图形在不同层次单元之间的关联,并在基于边的扫描线算法的基础上利用组合器的方法建立版图数据的正确连接.此算法能够极好的保持版图中原有的层次,在此算法基础上进行的层次网表提取能够使层次LVS得到最大程度的支持;同时,算法具有很高的效率,只需占用很少的资源.目前,九天EDA系列工具中的层次版图验证工具已经采用此算法.     

建模与仿真的动态V＆V技术综述

校核与验证（V＆V）技术包括非正规、静态、动态和正规四类技术，是保证建模与仿真（M＆S）的可信度的重要手段。动态V＆V技术是其中应用范围较广、数学和逻辑上比较正规的技术。它要求模型转化为应用并被执行，根据模型的执行行为来评价模型的精确性。首先简要介绍了M＆S的VV＆A和校核与验证技术的分类情况，然后论述了动态校核与验证技术并分析了各自的特点，最后介绍了在建模与仿真过程中动态V＆V技术的适用范围。对用于校核与验证的动态测试技术和统计技术作了重点介绍。     

基于SCV的MIPS指令集指令随机生成工具

介绍了在SystemC的系统级建模与验证环境中，使用SCV实现用于MIPS指令集指令随机生成的工具。该随机指令生成工具包括静态生成与动态生成两种工作模式。并针对随机指令生成中会遇到的数据访问越界、分支/跳转地址越界等问题提出了解决办法。此外还研究了针对流水线冲突进行验证的方法。     

Approximate methods for simulation and verification of numerically controlled machining programs

Algorithms for simulation and verification of Numerically Controlled (NC) machining programs are presented. Compared to NC simulation based on conventional solid modeling systems, these models are designed to give approximate results, but with a substantial decrease in computer time. The surfaces of the part are discretized into a Surface Point Set (SPS) with a point spacing dependent on cutting tool size and shape local surface curvature and the desired accuracy of the approximate simulation. The surface-surface intersection calculations of the solid modeling approach are replaced by the intersection of the surface of the tool movement envelope with straight lines emanating from the surface points. The methods are applicable to both 3 and 5 axis machining. Samples test cases are presented, and implementation and efficiency issues are discussed.     

STATE VERIFICATION FOR SYNCHRONOUS CIRCUITS

This paper presents the techniques of implicit traversing and state verification for sequential finite state machines(FSMs) based of on the state collapsing of state transition graph(STG). The problems of state designing are described. In order to achieve high state enumeration coverage, heuristic knowledge is proposed.     

Specifying Cash-Point with DisCo

We describe how the cash-point service problem of Formal Methods ’99 is specified using DisCo [Dis, JKS91]. Received January 2000 / Accepted in revised form December 2000     

Verification of Erlang Processes by Dependency Pairs

Erlang is a functional programming language developed by Ericsson Telecom, which is particularly well suited for implementing concurrent processes. In this paper we show how methods from the area of term rewriting are presently used at Ericsson. To verify properties of processes, such a property is transformed into a termination problem of a conditional term rewriting system (CTRS). Subsequently, this termination proof can be performed automatically using dependency pairs. The paper illustrates how the dependency pair technique can be applied for termination proofs of conditional TRSs. Secondly, we present three refinements of this technique, viz. narrowing, rewriting, and instantiating dependency pairs. These refinements are not only of use in the industrial applications sketched in this paper, but they are generally applicable to arbitrary (C)TRSs. Thus, in this way dependency pairs can be used to prove termination of even more (C)TRSs automatically. Received: October 6, 1999     

核素核查数据安全认证模式及裂变核素的最低检测限度模拟

概述了国际放射性核素监测系统中对放射性核素数据在测量过程的安全认证的要求，在推导并模拟铀、钍系衰变链中的相应子体和＾７Ｂｅ等核素从取样至测量过程中放射性活度变化规律以它们比值的基础上，建立样品取样测量运动及认证模式，在计算机拟合的基础上给出了＾９７Ｚｒ、＾１３７Ｃｓ、＾１４０Ｂａ等与ＣＴＢＴ监测系统要求相关的裂变产物核素的最低检测限度，     

小型高效蒸汽轮机主汽阀的优化设计

数值模拟了某小型高效汽轮机主调阀内的全三维复杂蒸汽流场,给出了阀门的整体流量特性曲线,分析了阀门内部流场细节,指出调节阀的喉道附近流场分布不均匀是造成阀门损失的主要原因。接着对阀碟型线进行优化,优化后的阀门通流量减小,流场内部涡流区大大减小,速度分布不均匀性得到改善,湍动能范围和幅值大幅度下降,这一切表明阀门的效率和稳定性得到很大的提高。最后,实验验证了阀门的通流特性和安全性,为阀门的结构优化设计提供了重要依据。     

On coupling 1D non-isothermal heat and mass transfer in porous materials with a multizone building energy simulation model

Hygroscopic materials available in the interior of buildings such as wood, gypsum, paper etc, are able to absorb moisture if the relative humidity of the room increases and release it again if the relative humidity decreases. This moisture buffering phenomenon is often accounted for in a simplified way in Building Energy Simulation programs (BES) e.g. TRNSYS, which limits their applicability. Nevertheless several building applications require an accurate prediction of the indoor relative humidity already from the design stage.