高性能单片机ADμC812

ADμC812是美国AD公司生产的一种用于数据采集的新型单片机训据采集系统芯片（MicroconverterTM)，该芯片将模数转换器（ADC）和数模转换器（DAC）与单片机80C51集成在一个芯片上，大大简化了数据采集系统及其它测控系统的设计，美国ADI公司出品的ADμC812集成有12位8通道的ADC和两个12位DAC，片内程序和数据Flash/EEPROM存储器，简单地用串口就可进行了调试和下载（烧录）程序（不需要任何仿真器和烧录器），极具广阔的推广，应用前景文章介绍了ADμC812的原理及其应用。     

银河机运行全系统半实物仿真软件的研究

一体化建模／仿真仿真环境能为用户提供良好的仿真建模环境，交互功能强的仿真运行环境和功能充分的结果分析环境，使仿真试验全过程都能方便地进行。现已研制成功的银河ＹＨ－Ｆ１一体化建模＝仿真环境ＹＦＩＭＡＳＥ是在ＭＰＳＥ基础上，按集成化软件模式，设计模型单元库及仿真数据库的整个软件支撑结构，设计类窗口界面，为用户提供良好的模环境，仿真运行环境及结果分析环境。     

GM-2测控系统软件设计

GM-2测控系统软件是为一种飞行器地面测控系统嵌入式计算机所开发的专用软件,具有对被测对象的测试、控制、仿真、记录等功能。其测试数据、曲线图表和指示结果是分析判定被测对象性能的重要依据。     

Two-Key Triple Encryption

In this paper we consider multiple encryption schemes built from conventional cryptosystems such as DES. The existing schemes are either vulnerable to variants of meet-in-the-middle attacks, i.e., they do not provide security corresponding to the full key length used or there is no proof that the schemes are as secure as the underlying cipher. We propose a variant of two-key triple encryption with a new method of generating three keys from two. Our scheme is not vulnerable to the meet-in-the-middle attack and, under an appropriate assumption, we can show that our scheme is at least about as hard to break as the underlying block cipher. Received 22 June 1995 and revised 11 October 1996     

规范关联交易行为 确保会计信息真实

通过对关联方关系和关联方交易的规定的介绍,明确了何为关联方和关联交易;对上市公司利用关联交易操纵会计信息的几种做法进行了剖析;就如何规范关联交易行为,确保会计信息真实性提出了看法。     

利用 FPGA 实现光纤传输

设计了基于FPGA控制的光纤传输装置，并给出了该设计的仿真波形的FPGA经逻辑综合后的原理框图。该装置可实现330MHz/Bit的传输率。从而完成了大数据量、高数据率的数据传输任务。     

目标毁伤评判的探讨

目标毁伤评判是C^3I系统的一个重要组成部分，在指挥决策中它是决定是否对目标实施第二次打击的主要判据。首先定义了目标毁伤评判的量化等级，其次讨论了目标毁伤评判特征参量的选取规则和目标毁伤评判函数的建立规则，最后以目标图像和目标轨迹平滑度为例，给出了目标毁伤等级量比评判的详细过程。     

Knowledge Discovery with Second-Order Relations

This paper presents an induction technique that discovers a set of classification rules, from a set of examples, using second-order relations as a representational model. Second-order relations are database relations in which tuples have sets of atomic values as components. Using sets of values, which are interpreted as disjunctions, provides compact representations that facilitate efficient management and enhance comprehensibility. The second-order relational framework is based on theoretical foundations that link relational database theory, machine learning, and logic synthesis. The rule induction technique can be viewed as a second-order relation compression problem in which the original relation, representing training data, is transformed into a second-order relation with fewer tuples by merging tuples in ways that preserve consistency with the training data. This problem is closely related to two-level Boolean function minimization in logic synthesis. We describe a rule-mining system, SORCER, and compare its performance to two state-of-the-art classification systems: C4.5 and CBA. Experimental results based on the average of error rates over 26 data sets show that SORCER, using a simple compression scheme, outperforms C4.5 and is competitive to CBA. Using a slightly more sophisticated compression scheme, SORCER outperforms both C4.5 and CBA. Received 5 October 1999 / Revised 15 February 2001 / Accepted in revised form 10 August 2001 Correspondence and offprint requests to: R. Hewett, Institute for Human and Machine Cognition, University of West Florida, 40 South Alcaniz Street, Pensacola, FL 32501, USA. Email: rhewett@ai.uwf.eduau     

基于PC机的虚拟逻辑分析仪的设计

逻辑分析仪的测试对象是数字系统中的数字信息，其结构复杂，成本较高。所述的是基于虚拟仪器概念的虚拟逻辑分析仪的设计思想和方法，由于部分硬件功能软化而使硬件电路大为简化，从而降低了仪器成本，提高了逻辑分析仪的可靠性和性能。重点阐述了基于PC机的虚拟逻辑分析仪的硬件电路设计和软件设计部分。     

用马尔可夫─贝叶斯方法预测孔隙度的分布

用地震资料预测储层参数可以为勘探和开发提供有价值的信息，可以提高钻井的成功率和布井的准确性。但地震所提供的信息存在着局限性，一般来说其精度较低。因此，要有效地预测储层参数，必须把地震、测井及地质学家的经验和推测结合起来。马尔可夫－贝叶斯方法就是这样一种方法。此方法不仅可以预测控制井点较少的区域，而且在没有井的区域，通过地质学家对点散图的解释，仍然可以得到区域储层参数的分布。本文用此方法仅做了孔隙度的估算，其它储层参数的估算道理相同。