An Interactive Manager for Pascal Software

An interactive facility for development and maintenance of Pascal programs is described. Features include interactive addition, deletion and modification of modules, independentcompilation of groups of procedures, and automatic recompilation of an entire program only if global declarations are modified. The implementation required modification of a Pascal compiler to process an arbitrary number of programs in a single run and to compile correctly if the main program is missing. Overall processing is managed by a parameterized control statement procedure that invokes several system utilities. The facility has been used successfully in instructional and research computing situations. Significant remaining problems are errors caused by mismatched parameters between independently compiled procedures, and interpretation by users of error messages generated by system utilities.     

图形交互式自动控制系统计算机辅助教学软件设计开发

基于MATLAB环境,采用图形用户界面设计开发了菜单驱动的自动控制系统计算机辅助教学软件,使用该软件,不需任何编程,即可方便地进行单输入单输出连续控制系统的模型变换,性能分析和控制器设计。     

QOCA: A Constraint Solving Toolkit for Interactive Graphical Applications

We describe an object-oriented constraint solving toolkit, QOCA, designed for interactive graphical applications. It has a simple yet powerful interface based on the metric space model for constraint manipulation. In this model interaction with the constraint solver can occur in three ways: a constraint may be added, a constraint may be deleted, or values for designated edit variables may be suggested. Currently, QOCA supports linear arithmetic constraints and two different metrics: the square of the Euclidean distance and Manhattan distance. It provides three solvers, all of which rely on keeping the constraints in solved form and relies on novel algorithms for efficient resolving of constraints during direct manipulation. We provide a thorough evaluation of QOCA, both of the interface design and the speed of constraint solving.     

A case for acquiring Pascal

This paper is a copy of the case made by the author to his County Council for acquisition of a Pascal compiler for their computer. Its message is essentially that Pascal is the best thing since sliced bread.     

A portable trace for the Pascal heap

Debugging aids for high-level languages supporting structured data types should provide diagnostic information in a form terminologically as close as possible to that of the original source code. In addition, it is desirable that such software be portable. The package HEAPTRACE satisfies both the above criteria. It is a precompiler for Pascal programs which enables the user to trace the heap, selectively dumping dynamically-created records in a high-level format. It is portable as it is written entirely in Pascal; furthermore, since it is implemented as additions and modifications to a well-known compiler, its principles may easily be built into any Pascal compiler or diagnostics system. However, there is a small price to pay for achieving portability in that three possibly desirable features cannot be satisfactorily implemented in a machine-independent manner.     

A semantically-based formatting discipline for Pascal

The abstract (or semantic) syntax of the Pascal language is identified, and a linear representation for the trees so formed within the framework of the concrete syntax for that language is imposed. The indentation scheme so formed, augmented with a small number of pragmatic considerations, is compared with several previously proposed formatting schemes for Pascal and an example of the use of this new method is given.     

The Use of High-Level 3-D Graphical Types in the Mira Animation System

A graphical extension of Pascal enables programmers to build complex 3-D objects and to describe their motions.     

A High-Level Recognizer for Schematic Diagrams

This recognizer uses high-level knowledge stored in a global, modifiable database. It is adaptable to a variety of diagrams.     

A Pascal program for computing the DNA concentration in cellular homogenates

The use of manual graphical methods for evaluating the results of Brunk's fluorometric DNA concentration assay was found to be subjective and time-consuming. That is why a short program (in Turbo Pascal, version 4) for fluorometric data processing was designed.     

Wavelet-Based 3D Compression Scheme for Interactive Visualization of Very Large Volume Data

Interactive visualization of very large volume data has been recognized as a task requiring great effort in a variety of science and engineering fields. In particular, such data usually places considerable demands on run-time memory space. In this paper, we present an effective 3D compression scheme for interactive visualization of very large volume data, that exploits the power of wavelet theory. In designing our method, we have compromised between two important factors: high compression ratio and fast run-time random access ability. Our experimental results on the Visual Human data sets show that our method achieves fairly good compression ratios. In addition, it minimizes the overhead caused during run-time reconstruction of voxel values. This 3D compression scheme will be useful in developing many interactive visualization systems for huge volume data, especially when they are based on personal computers or workstations with limited memory.     

基于MATLAB的图形交互式数字信号处理教学实验系统

目前还没有一个关于数字信号处理课程很好的教学实验系统,以MATLAB作为二次开发平台,结合数字信号处理课程的内容设计并实现了一个图形交互式教学实验系统。该系统不仅可以演示实验,还可以让用户自行修改实验参数。该系统不仅可以很好地用于实验教学,还可用于辅助理论教学,改善了教学的效果。     

A heap-based implementation of the programming language Pascal

The implementation of Pascal known as Pascal ‘P’ was modified so that activation records for blocks (procedures and functions) were no longer allocated on a stack, but were instead allocated on a heap. This was done partly to test the feasibility of using Pascal ‘P’ for experimenting with extensions to Pascal, and partly to assess the efficiency of implementing Pascal procedures and functions in this way. The necessary changes to Pascal ‘P’ are described; where alternative strategies were possible, these are outlined and the reasons for the final choice given. The heap management algorithms used are presented and, in particular, their behaviour when managing the activation records of Pascal programs which do not involve dynamic variables is explained. Quantitative comparisons are made between Pascal ‘P’ and the version with heap-allocated activation records, to assess their relative efficiencies; these comparisons indicate that the modified system uses more storage, but it gives rise to only slightly longer execution times. Alternative heap management algorithms are discussed. Finally, some advantages of heap-allocated activation records are presented.     

MAP: A Pascal macro preprocessor for large program development

The programming language Pascal was originally designed for teaching introductory programming. Currently, however, production systems use it as the primary implementation language. This paper describes extensions of Pascal intended to aid the large program developer. The extensions are implemented in a macro preprocessor MAP, which supports constant expression evaluation, source file inclusion, conditional compilation and macro substitution. While each of these features can be used independently, they are all implemented with a simple, uniform syntax. Furthermore, in keeping with the spirit of Pascal, an attempt has been made to make the facilities straightforward and simple. The design and implementation details are discussed.     

GRASP—A 3D graphics system for Pascal users

This paper describes a 3D graphics package ‘GRASP’ implemented in Pascal language and interfaced with the Pascal compiler developed for the DEC PDP-10 machine, by Urs Amman et al. GRASP supports storage tube and raster scan graphics terminals and pen plotters. The package is incorporated as a set of standard procedures into the enhanced Pascal compiler. The various features of the package are presented here and a comparison is made vis-a-vis the other existing 3D graphics packages. GRASP is simple to use and provides a valuable tool for the development of application programs written in Pascal and requiring a graphics capability.     

Connection Analysis: A Practical Interprocedural Heap Analysis for C

This paper presents a practical heap analysis technique, connection analysis, that can be used to disambiguate heap accesses in C programs. The technique is designed for analyzing programs that allocate many disjoint objects in the heap such as dynamically-allocated arrays in scientific programs. The method statically estimates connection matrices which encode the connection relationships between all heap-directed pointers at each program point. The results of the analysis can be used by parallelizing compilers to determine when two heap-allocated objects are guaranteed to be disjoint, and thus can be used to improve array dependence and interference analysis. The method has been implemented as a context-sensitive interprocedural analysis in the McCAT optimizing/parallelizing C compiler. Experimental results are given to compare the accuracy of connection analysis versus a conservative estimate based on points-to analysis.     

A Computer-Aided Robotic Arm/Worktable System for the High-Level Quadriplegic

Opening the door to self-reliance for quadriplegics, this system provides manipulative capability for doing several tasks without assistance—including typing and using a computer.     

A comparison of the ANSI and ISO Pascal Standards

We compare the American and international standards for Pascal and make suggestions to help implementors and programmers achieve the greatest possible compatibility with both standards.