实时多任务系统的TPCQ建模方法

本文提出了一个基于定时的Ｐｅｔｒｉ网和立方体队列网络的实时多任务系统的建模方法－ＴＰＣＱ，它特别适合于描述含有同步、通信和立方体队列调度的复杂的实时多任务系统，也可以描述一般的实时多任务系统。文中讨论了ＴＰＣＱ模型，并且给出了一个建立实时多任务系统的ＴＰＣＱ模型的例子。     

用TMS320C25与PC机构成的并行计算机系统

ＴＭＳ３２０Ｃ２５是一种高性能数字信号处理器。本文介绍了一种用ＴＭＳ３２０Ｃ２５与ＰＣ机构成的主从结构并行计算机系统。该系统的特点是将ＴＭＳ３２０Ｃ２５高速数字信号处理系统作为ＰＣ机的插件板，直接插入ＰＣ机的扩展槽中，利用双口ＲＡＭ实现ＴＭＳ３２０Ｃ２５与ＰＣ机之间的相互通讯。它能适用于高速数字信号处理、图形／图像处理、语音处理等。文中详细论述了系统的工作原理、硬年龄件结构，包括总体设计、接口设计     

PCTE结构分析

ＰＣＴＥ项目定义了一个公共工具接口，使得软件工程环境可在其上构造。该接口标准公布于１９８６年９月，且目前已在多个不同的机器中实现了多个不同的版本。ＰＣＴＥ＋是在ＰＣＴＥ工作的基础上定义的公共工具接口。可用于国防和其它高保密性的应用场合。在此基础上，ＥＣＭＡ／ＴＣ３３对其进行了标准化工作。得到ＰＣＴＥ１４９。本文综述了目前ＰＣＴＥ活动的状况，提出ＰＣＴＥ的主要概念，分析了其结构和主要构成机制，可为国     

基于STEP和约束机制的CAD/CAP集成技术的研究

提出一种支持用户自定义ＣＡＰＰ数据结构,及与多种ＣＡＰＰ系统集成的方法,通过对ＣＡＰＰ系统的数据模型（用Ｃ／Ｃ＋＋描述）进行分析,获取其词法与语义信息,按照ＣＡＰＰ系统数据模型的数据要求,在集成系统的末端给出工艺数据,以工艺特征树为操作核心,实现了ＣＡＤ系统与多种ＣＡＰＰ系统之间的数据交换。同时,该技术在产品数据的交换中支持ＳＴＥＰ标准,实现了基于ＳＴＥＰ的信息集成。     

面向对象的3级结构时空数据模型

时态GIS的组织核心是地理时空数据库。时空数据模型则是时空数据库的基础。文中对已有的时态属性数据表达方法，时空数据模型进行了系统的分析。对设计时空数据模型所必须解决的问题进行了讨论。从面向对象的基本概念出发，着重阐述了面向对象时空数据模型的设计方法，完整地定义和描述了时空数据模型所涉及的时空对象类型。文中还对模型的时态属性数据组织和空间对象的时态处理进行了描述。     

青鸟C++程序理解工具

程序理解是软件开发过程中一项重要活动,为了保证该活动的准确性和高效性,有理解工具的半自动支持是关键的。青鸟Ｃ＋＋程序理解工具（ＪＢＰＣＴ－Ｃ＋＋）支持用户的多样需求,辅助多种理解策略,为用户理解程序提供了很大帮助。该文概要介绍了青鸟Ｃ＋＋程序理解工具（ＪＢＰＣＴ－Ｃ＋＋）的设计目标和原则、体系结构以及基本功能。     

GATR－C50开发应用系统研制

介绍了一种以ＴＭ３２０Ｃ５０为数字信号处理器，以ＩＢＭ－ＰＣ（ＸＴ，ＡＴ，３８６，４８６及兼容机）为主机的微机扩展系统。该系统可直接插在ＰＣ机的扩展槽中，充分利用ＰＣ机的软硬件资源，实现ＤＳＰ应用程序的开发、信号的实时显示和记录等。系统板上还带有ＴＬＣ３２０４４专用芯片，可直接用于语音信号的采集与处理。     

AT＆T推出新的个人通信系统

ＡＴ＆Ｔ推出新的个人通信系统为满足美国对个人通信服务（ＰＣＳ）日益增长的需求，ＡＴ＆Ｔ推出了一系列新的个人通信系统这些系统都以数字无线通信用的Ｎｏｒ山Ａｍｅｒｉｃａｎ标准，工作于１８—２ＺＧＨＺ。ＡＴ＆Ｔ的个人通信系统为初次引入ＰＣＳ的运营公司提供一...     

GATR—C50开发应用系统研制

介绍了一种以ＴＭ３２０Ｃ５０为数字信号处理器，以ＩＢＭ－ＰＣ（ＸＴ，ＡＴ，３８６，４８６及兼容性）为主机的微机扩展系统。该系统可直接插在ＰＣ机的扩展槽中，充分利用机的软硬件资源，实现ＤＳＰ应用程序的开发，信号的地显示和记录等，系统板上带有ＴＬＣ３２０４４专用芯片，可直接用于语音信号的采集与处理。     

专家系统开发工具ESDT—HKD的知识描述结构

专家系统开发工具ＥＳＤＴ－ＨＤＫ是一种通用知识工程语言，采用规则＋框架＋黑板作为系统的知识结构。本文详细地介绍它的知识描述结构及组织形式。     

Models and their worlds

Conventional behavioral models can be broadly classed as stimulus-driven (bottom-up, S–R) and brain-driven (top-down, cognitive). Perceptual control theory (PCT) uses a model that has features of both classes, and so can be difficult to distinguish from either one. The difference in PCT is not just in the model of the organism, but in the assumed properties of the world in which the organism behaves. We discuss and experimentally demonstrate the basic models, and the worlds in which they can operate properly. The results show, we believe, that PCT employs the only kind of model that can work in a realistic model of the world.     

The application of data types to database semantic integrity

Data type concepts are used to investigate the extent to which database semantic integrity can be defined and ensured through database structures. Database and datatype concepts are extended mutually to improve the semantic capabilities of both database models and data type systems and to resolve apparent discrepencies between databases and programming languages. To meet database needs, data structuring is developed to form an algebra of data types. A semantically rich database model is used to show that database models can be expressed in terms of data types. Finally, a schema specification language is presented to demonstrate the power of data type tools for the definition of database schemas and for the maintenance of database semantic integrity.     

Performance analysis of multiprocessor systems containing functionally dedicated processors

Summary General models of multiprocessor systems in which processors are functionally dedicated are described. In these models, processors are divided into different types. A task can be assigned only to a processor of certain types. Clearly, the model of multiprocessor systems with identical processors is a special case of our models. These models also include the job shop problem in which there is exactly one processor of each type. Worst case performance bounds of priority-driven schedules are obtained.This work was supported by the National Science Foundation under Grants NSFDCR 72-03740 and NSFMCS 73-03408     

GENMIX—A generalized petrological mixing model program

GENMIX is an interactive FORTRAN program to solve generalized petrological mixing models of the type, biotite + sillimanite + quartz = garnet + K-feldspar + water, as well as simple mixing models of the type, basalt = andesite + olivine + pyroxene. The driving program is designed for ease of use and provides facilities for printing, editing, changing and adding analyses or oxides to the data bank from which analyses are selected for use in the model. Analyses also can have Fe ratios changed, be recalculated to sum to 100 percent, or be restored to previous values. The program is suited ideally for teaching purposes, as it is impossible to crash by incorrect data input, due to innumerable error traps and all data being read as characters before being converted to numbers.     

A real-time temporal Bayesian architecture for event surveillance and its application to patient-specific multiple disease outbreak detection

Reliable and accurate detection of disease outbreaks remains an important research topic in disease outbreak surveillance. A temporal surveillance system bases its analysis on data not only from the most recent time period, but also on data from previous time periods. A non-temporal system only looks at data from the most recent time period. There are two difficulties with a non-temporal system when it is used to monitor real data which often contain noise. First, it is prone to produce false positive signals during non-outbreak time periods. Second, during an outbreak, it tends to release false negative signals early in the outbreak, which can adversely affect the decision making process of the user of the system. We conjecture that by converting a non-temporal system to a temporal one, we may attenuate these difficulties inherent in a non-temporal system. In this paper, we propose a Bayesian network architecture for a class of temporal event surveillance models called BayesNet-T. Using this Bayesian network architecture, we can convert certain non-temporal surveillance systems to temporal ones. We apply this architecture to a previously developed non-temporal multiple-disease outbreak detection system called PC and create a temporal system called PCT. PCT takes Emergency Department (ED) patient chief complaint data as its input. The PCT system was constructed using both data (non-outbreak diseases) and expert assessments (outbreak diseases). We compare PCT to PC using a real influenza outbreak. Furthermore, we compare PCT to both PC and the classic statistical methods CUSUM and EWMA using a total of 240 influenza and Cryptosporidium disease outbreaks created by injecting stochastically simulated outbreak cases into real ED admission data. Our results indicate that PCT has a smaller mean time to detection than PC at low false alarm rates, and that PCT is more stable than PC in that once an outbreak is detected, PCT is better at maintaining the detection signal on future days.     

智能化图象数据库系统的GBASE的模式设计

知识化图象数据库系统近年来引起了人们的研究兴趣,表现出了广泛的应用前景.本文 介绍一种知识化图象数据库管理系统GBASE的模式设计,它将传统的关系模式加以扩充,使 之能容许框架知识表达的抽象数据类型(ADTs),增强了关系数据库系统的语义描述能力,有 助于表达有关图象实体以及它们之间的空间关系等有关知识.利用ADT我们可以进行知识 引导下的数据库查询、图象实体空间关系的推理以及基于应用模型的辅助设计和规划.GBASE 系统是在VAX11/750机上在VMS操作系统下,以C语言完成的.它统一管理着多种类型 的信息,即关系数据、图形、图象数据、知识以及过程等,是一个综合的图象数据库管理系统. 目前正应用于林业资源的管理和规划.     

面向对象多介质数据库管理系统

本文讨论的是一个面向对象的多介质数据库管理系统。它能对文本、图形、图象、声音等多种介质形式的数据进行有效的管理和维护。文中介绍了系统的一些概念、设计目标、实现手段以及模型上的一些问题。     

一种领域知识图谱的本体根类型设计

对象根类型的分类是构建领域知识图谱的基础工作,而现有流行的公共知识库并没有按照领域数据的特点分类,如SUMO的唯一的根类型就是实体,使得领域知识表达存在一定挑战,无法完整地表达如文本、视频图片等知识和关联。领域知识图谱本体的对象根类型除了实体类型,还应增加事件类型、文本类型和多媒体类型,基于4种根类型再扩展到具体分类来表达领域的知识,采用这种方式,可以更好地描述各种典型的领域场景,在实际知识图谱的工具研发中,体现出良好的知识体系和清晰的分类思路。     

Multi-granulation rough sets based on tolerance relations

The original rough set model is primarily concerned with the approximations of sets described by a single equivalence relation on the universe. Some further investigations generalize the classical rough set model to rough set model based on a tolerance relation. From the granular computing point of view, the classical rough set theory is based on a single granulation. For some complicated issues, the classical rough set model was extended to multi-granulation rough set model (MGRS). This paper extends the single-granulation tolerance rough set model (SGTRS) to two types of multi-granulation tolerance rough set models (MGTRS). Some important properties of the two types of MGTRS are investigated. From the properties, it can be found that rough set model based on a single tolerance relation is a special instance of MGTRS. Moreover, the relationship and difference among SGTRS, the first type of MGTRS and the second type of MGTRS are discussed. Furthermore, several important measures are presented in two types of MGTRS, such as rough measure and quality of approximation. Several examples are considered to illustrate the two types of multi-granulation tolerance rough set models. The results from this research are both theoretically and practically meaningful for data reduction.     

浅谈Solid Edge与ANSYS的数据传递

提出使用Solid Edge的三维建模功能进行实体建模,将模型保存成ANSYS可识别的文件格式,导入ANSYS进行有限元分析,使建模过程简化;并详细介绍了模型数据传递及之后的处理步骤,对传递转换的各种文件格式的特点进行了比较。