Journal of Microcomputer Applications最新文献

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Hypermedia systems without links 没有链接的超媒体系统

Journal of Microcomputer Applications

Pub Date : 1994-10-01 DOI: 10.1006/jmca.1994.1022

H. Maurer, A. Philpott, N. Scherbakov

Although there is no universally accepted definition of what a hypermedia system really is, most hypermedia specialists seem to agree on one basic issue. A hypermedia system contains some pieces of information (often called nodes or chunks) that are tied together by links. Links in fact have almost become a defining characteristic of hypermedia.

In this paper we contend that the importance of links has been grossly exaggerated. Hypermedia systems in which links play only a limited role are quite conceivable. Indeed, many burning issues in current day hypermedia systems can be better resolved if other navigational techniques are used. We believe that the emphasis on links has caused a rather myopic view of hypermedia systems. A serious re-evaluation of the extent to which links are beneficial is important. This fact has been previously observed by others, the earliest being Van Dam's keynote address at 'Hypertext'87'. In this paper we propose a first significant step in using structure to replace links.

尽管对于什么是超媒体系统还没有一个普遍接受的定义，但大多数超媒体专家似乎在一个基本问题上达成了一致。超媒体系统包含一些通过链接连接在一起的信息片段（通常称为节点或块）。事实上，链接几乎已经成为超媒体的一个定义特征。在这篇论文中，我们认为联系的重要性被严重夸大了。链接只起有限作用的超媒体系统是可以想象的。事实上，如果使用其他导航技术，当前超媒体系统中的许多棘手问题可以得到更好的解决。我们认为，对链接的强调导致了对超媒体系统的短视。认真重新评估联系的有益程度是很重要的。这一事实以前曾被其他人观察到，最早的是范·达姆在“超文本”87的主题演讲。在本文中，我们提出了使用结构替换链接的第一个重要步骤。

引用次数: 12

From hypertext to active communication/information systems 从超文本到主动通信/信息系统

Journal of Microcomputer Applications

Pub Date : 1994-10-01 DOI: 10.1006/jmca.1994.1023

Frank Kappe, Hermann Maurer

In this paper we advocate the integration of advanced communication facilities into a distributed hypermedia system. We will first develop a set of user requirements and then come up with a simple design based on three orthogonal concepts (annotation, active collections, and active documents) that can be used to implement the required features in a certain implementation of a distributed hypermedia system (Hyper-G).

We also show how allowing to apply the three concepts to every object of the information space (as implied by the principle of orthogonality) transforms the passive information system into an 'active communication/information system' in which the user is not only able to contribute to the information body, but is also able to let the system actively seek and deliver information according to the user's interests.

在本文中，我们主张将先进的通信设施集成到分布式超媒体系统中。我们将首先开发一组用户需求，然后提出一个基于三个正交概念（注释、活动集合和活动文档）的简单设计，这些概念可用于实现分布式超媒体系统（Hyper-G）的特定实现中所需的功能。我们还展示了如何将这三个概念应用于信息空间的每个对象（正如正交性原理所暗示的那样）将被动信息系统转变为“主动通信/信息系统”，在该系统中，用户不仅能够为信息主体做出贡献，而且能够让系统根据用户的兴趣主动寻求和传递信息。

引用次数: 16

Hypermedia systems without links 没有链接的超媒体系统

Journal of Microcomputer Applications

Pub Date : 1994-10-01 DOI: 10.1006/JMCA.1994.1022

H. Maurer, A. Philpott, N. Scherbakov

Abstract Although there is no universally accepted definition of what a hypermedia system really is, most hypermedia specialists seem to agree on one basic issue. A hypermedia system contains some pieces of information (often called nodes or chunks) that are tied together by links. Links in fact have almost become a defining characteristic of hypermedia. In this paper we contend that the importance of links has been grossly exaggerated. Hypermedia systems in which links play only a limited role are quite conceivable. Indeed, many burning issues in current day hypermedia systems can be better resolved if other navigational techniques are used. We believe that the emphasis on links has caused a rather myopic view of hypermedia systems. A serious re-evaluation of the extent to which links are beneficial is important. This fact has been previously observed by others, the earliest being Van Dam's keynote address at 'Hypertext'87'. In this paper we propose a first significant step in using structure to replace links.

尽管对于什么是真正的超媒体系统还没有一个被普遍接受的定义，但大多数超媒体专家似乎在一个基本问题上是一致的。超媒体系统包含一些信息片段(通常称为节点或块)，这些信息片段通过链接连接在一起。事实上，链接几乎已经成为超媒体的一个决定性特征。在本文中，我们认为链接的重要性被严重夸大了。链接只发挥有限作用的超媒体系统是完全可以想象的。事实上，如果使用其他导航技术，当前超媒体系统中的许多亟待解决的问题可以得到更好的解决。我们认为，对链接的强调导致了对超媒体系统的相当短视的看法。认真地重新评估这种联系的有益程度是很重要的。这一事实之前已经被其他人观察到，最早的是Van Dam在“超文本”87年的主题演讲。在本文中，我们提出了用结构代替链接的第一个重要步骤。

引用次数: 12

A graphical query language for simulation databases 仿真数据库的图形查询语言

Journal of Microcomputer Applications

Pub Date : 1994-10-01 DOI: 10.1006/JMCA.1994.1024

A. Oberweis, V. Sänger

Abstract In this paper we propose a graphical query language to analyse simulation runs which are stored in databases with a temporal dimension. A simulation run is a sequence of system states produced by discrete simulation. It may become very large, such that manual analysis based on database browsing is no longer feasible. Hence simulation databases require a specific query language to analyse the simulation data. Queries may be related to single states (e.g. Is there a state where condition c1 holds? ) or to state sequences (e.g. Is there a state sequence, where first c1 holds, then c2 and finally c3? ). An existing Petri net simulation environment has been extended to support the described concepts.

本文提出了一种图形查询语言，用于分析存储在具有时间维度的数据库中的仿真运行。模拟运行是由离散模拟产生的一系列系统状态。它可能变得非常大，以至于基于数据库浏览的手动分析不再可行。因此，仿真数据库需要一种特定的查询语言来分析仿真数据。查询可能与单个状态相关(例如，是否存在条件c1满足的状态?)或状态序列(例如，是否存在状态序列，其中首先c1保持，然后c2，最后c3?)．已经扩展了现有的Petri网仿真环境以支持所描述的概念。

引用次数: 3

From hypertext to active communication/information systems 从超文本到主动通信/信息系统

Journal of Microcomputer Applications

Pub Date : 1994-10-01 DOI: 10.1006/JMCA.1994.1023

F. Kappe, H. Maurer

Abstract In this paper we advocate the integration of advanced communication facilities into a distributed hypermedia system. We will first develop a set of user requirements and then come up with a simple design based on three orthogonal concepts (annotation, active collections, and active documents) that can be used to implement the required features in a certain implementation of a distributed hypermedia system (Hyper-G). We also show how allowing to apply the three concepts to every object of the information space (as implied by the principle of orthogonality) transforms the passive information system into an 'active communication/information system' in which the user is not only able to contribute to the information body, but is also able to let the system actively seek and deliver information according to the user's interests.

摘要本文倡导将先进的通信设备集成到分布式超媒体系统中。我们将首先开发一组用户需求，然后基于三个正交的概念(注释、活动集合和活动文档)提出一个简单的设计，这些概念可用于在分布式超媒体系统(Hyper-G)的特定实现中实现所需的功能。我们还展示了如何将这三个概念应用于信息空间的每一个对象(正如正交性原则所暗示的那样)，将被动的信息系统转变为“主动的通信/信息系统”，在这种系统中，用户不仅能够为信息体做出贡献，而且还能够让系统根据用户的兴趣主动寻找和传递信息。

引用次数: 16

Using both virtual 8086 and protected modes to implement OBJIX microkernal on I80386 使用虚拟8086和保护模式在I80386上实现OBJIX微内核

Journal of Microcomputer Applications

Pub Date : 1994-10-01 DOI: 10.1006/JMCA.1994.1026

F. Plášil, M. Gróf

Abstract This paper presents the techniques used in a microkernel based on I80386/80486 architecture. These techniques were created during the OBJIX project—an object-oriented operating system design. One of the goals of the system was to combine the virtual 8086 and the protected mode of the processor. To achieve the goal, new concepts such as stand-in process, exception stand-in process and superkernel are introduced. At the end of the paper, a proof is given that no consistent hardware support for preemptive context switching on I80386 exists if the context switching is mediated by a timer process.

本文介绍了基于I80386/80486架构的微内核中所使用的技术。这些技术是在OBJIX项目(一个面向对象的操作系统设计)期间创建的。该系统的目标之一是将虚拟8086和处理器的保护模式结合起来。为了实现这一目标，引入了替代进程、异常替代进程和超内核等新概念。在论文的最后，给出了一个证明，如果上下文切换是由定时器进程介导的，那么在I80386上不存在对抢占式上下文切换的一致硬件支持。

引用次数: 0

Index to Volume 17 第17卷索引

Journal of Microcomputer Applications

Pub Date : 1994-10-01 DOI: 10.1006/jmca.1994.1027

引用次数: 0

A graphical query language for simulation databases 仿真数据库的图形查询语言

Journal of Microcomputer Applications

Pub Date : 1994-10-01 DOI: 10.1006/jmca.1994.1024

A. Oberweis, V. Sänger

In this paper we propose a graphical query language to analyse simulation runs which are stored in databases with a temporal dimension. A simulation run is a sequence of system states produced by discrete simulation. It may become very large, such that manual analysis based on database browsing is no longer feasible. Hence simulation databases require a specific query language to analyse the simulation data. Queries may be related to single states (e.g. Is there a state where condition c1 holds? ) or to state sequences (e.g. Is there a state sequence, where first c1 holds, then c2 and finally c3? ).

An existing Petri net simulation environment has been extended to support the described concepts.

在本文中，我们提出了一种图形查询语言来分析存储在具有时间维度的数据库中的模拟运行。模拟运行是由离散模拟产生的一系列系统状态。它可能会变得非常大，以至于基于数据库浏览的手动分析不再可行。因此，模拟数据库需要特定的查询语言来分析模拟数据。查询可能与单个状态有关（例如，是否存在条件c1成立的状态？）或与状态序列有关（例如：是否存在状态序列，先是c1成立，然后是c2，最后是c3？）。现有的Petri网模拟环境已扩展为支持所述概念。

引用次数: 3

Using both virtual 8086 and protected modes to implement OBJIX microkernel on 180386 在180386上使用虚拟8086和保护模式实现OBJIX微内核

Journal of Microcomputer Applications

Pub Date : 1994-10-01 DOI: 10.1006/jmca.1994.1026

F. Plášil, M. Gróf

This paper presents the techniques used in a microkernel based on I80386/80486 architecture. These techniques were created during the OBJIX project—an object-oriented operating system design. One of the goals of the system was to combine the virtual 8086 and the protected mode of the processor. To achieve the goal, new concepts such as stand-in process, exception stand-in process and superkernel are introduced. At the end of the paper, a proof is given that no consistent hardware support for preemptive context switching on I80386 exists if the context switching is mediated by a timer process.

本文介绍了在基于I80386/80486体系结构的微内核中使用的技术。这些技术是在OBJIX项目期间创建的，OBJIX是一种面向对象的操作系统设计。该系统的目标之一是将虚拟8086和处理器的受保护模式相结合。为了实现这一目标，引入了替代过程、异常替代过程和超内核等新概念。在论文的最后，证明了如果上下文切换是由定时器进程介导的，则在I80386上不存在对抢先上下文切换的一致硬件支持。

引用次数: 0

A new fuzzy logic control scheme for enhanced performance: simulation and experimental studies 一种新的提高性能的模糊逻辑控制方案:仿真与实验研究

Journal of Microcomputer Applications

Pub Date : 1994-10-01 DOI: 10.1006/JMCA.1994.1025

C. Lim

Abstract In most fuzzy logic control schemes, the control signal is determined by using the error signal, e (.), and its first derivative, e (.), as the input signals. In this paper, these inputs signals e (.) and e (.) are modified respectively to e m (.) and e m (.), where e m (.) is given by e (.) + k m e (.) and k m is a constant. This modification enables the performance of the overall system to be further improved through a proper choice of k m . Moreover, the proposed scheme is simple and easy to implement as the number of signal to be measured remains unchanged after the modification. A non-linear power system is first chosen to demonstrate the effectiveness of the proposed scheme through simulations. The proposed scheme is specifically applied to enhance the damping of the mechanical mode oscillation of this non-linear power system. A real-time experimental study which involves the control of a servomotor is then performed.

在大多数模糊逻辑控制方案中，控制信号是由误差信号e(.)及其一阶导数e(.)作为输入信号来确定的。本文将这两个输入信号e(.)和e(.)分别修改为e(.)和e m(.)，其中e m(.)由e (.) + k m e(.)给出，k m为常数。通过适当选择k m，可以进一步提高整个系统的性能。此外，该方案修改后的待测信号数保持不变，结构简单，易于实现。首先选取了一个非线性电力系统，通过仿真验证了该方法的有效性。该方案专门用于增强该非线性电力系统的机械模态振荡的阻尼。然后进行了涉及伺服电机控制的实时实验研究。

引用次数: 0

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