物件導向軟體之架構(Object-Oriented Software Construction)探討

Aspect] is a simple and practical aspect-oriented extension to Java With just a few new constructs, AspectJ provides support for modular implementation of a range of crosscutting concerns. In AspectJ's dynamic join point model, join points are well-defined points in the execution of the program; pointcuts are collections of join points; advice are special method-like constructs that can be attached to pointcuts; and aspects are modular units of crosscutting implementation, comprising pointcuts, advice, and ordinary Java member declarations. AspectJ code is compiled into standard Java bytecode. Simple extensions to existing Java development environments make it possible to browse the crosscutting structure of aspects in the same kind of way as one browses the inheritance structure of classes. Several examples show that AspectJ is powerful, and that programs written using it are easy to understand.

An overview of AspectJ

This paper describes the ATLAS experiment as installed in i ts experimental cavern at point 1 at CERN. It also presents a brief overview of the expec ted performance of the detector.

http://absimage.aps.org/image/SES08/MWS_SES08-2008-020010.pdf

The ATLAS Experiment at the CERN Large Hadron Collider

by J. Biggs and C. Tang, Maidenhead, England,
Open University Press, 2007, 360 pp., £29.99, ISBN-13: 978-0-335-22126-4

Teaching for quality learning at university

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Understanding By Design

Petri nets are a well-known formalism widely used in different application areas. Yet, the lack of adequate tools that can be integrated within engineering development frameworks are one major drawback. This paper identifies and justifies the characteristics of one class of Petri nets targeted for the modelling of automation systems and (networked) embedded systems, named as input-output Petri net (IOPT), and its representation using the Petri net markup language (PNML). The paper also presents a set of associated tools under development. This Petri net class, defined on top of the well-known place-transition Petri nets, is the common link across a set of tools under development, including a graphical editor, a state-space analyser for the verification of properties, conflict resolution through automatic arbiter generation, automatic code generators, simulator, among others. In this sense, the main goal of the proposed Petri net class and associated tools is to support the entire system development flow, from specification to implementation.

The Input-Output Place-Transition Petri Net Class and Associated Tools

Along Petri nets' history, numerous approaches have been proposed that try to manage model size through the introduction of structuring mechanisms allowing hierarchical representations and model composability. This paper proposes a classification system for Petri nets' structuring mechanisms and discusses each one of them. These include node fusion, node vectors, high-level nets, and object-oriented inspired Petri nets extensions, among others. One running example is used emphasizing the application of the presented mechanisms to specific areas, namely to automation systems modeling, and software engineering, where object-oriented modeling plays a major role.

/pdf/structuring-and-composability-issues-in-petri-nets-modeling-oykpeu34k3.pdf

Structuring and composability issues in Petri nets modeling

Modeling of discrete-event systems using Petri net models is well-studied. Also, their usage for specification of digital controllers is widely used. Yet, it is recognized that we have a lack of tools when facing support for the implementation of these models, namely for automatic code generation. The paper briefly presents the FORDESIGN project that aims to develop a set of tools to contribute for filling this gap within automation systems and (networked) embedded systems development. The set of tools is based on a Petri net class, named as Input-Output Petri Net (IOPT), and its representation using the Petri Net Markup Language (PNML). The paper presents some rules used by an automatic code generator able to produce VHDL code starting with the PNML representation of the Petri net model.

https://paginas.fe.up.pt/~specs/amadeus/pubs/ISIE2010final.pdf

From Petri net models to VHDL implementation of digital controllers

The high variability of students' backgrounds typically found in introductory programming courses creates additional difficulties to foster motivation and ensure the desired competency and retention rates. This paper presents and discusses the results of applying an assessment methodology strongly based upon lab exams (or on-computer exams) with the objective of ensuring programming pratice competency while maintaining students' motivation. It discusses the difficult balances of several assessment methods, details the used assessment methodology and finally presents students results and views. These show that lab exams, although more demanding then group assignments, can be made popular among students if they perceived them as fairer.

Using lab exams to ensure programming practice in an introductory programming course

Different tools often implement a single Petri net refinement or composition concept in different ways. This situation is undesirable from an engineering point of view. Here, we present a set of operations on nets based on the concepts of net instances and fusion sets, supporting the specification of net structure's abstractions and net model transformations in an integrated and generic way. The operations are illustrated by composing a net model for a medium-sized control system. The same operations are then used to specify modifications to the initial model

João Paulo Barros

Papers

The Input-Output Place-Transition Petri Net Class and Associated Tools

Structuring and composability issues in Petri nets modeling

From Petri net models to VHDL implementation of digital controllers

Using lab exams to ensure programming practice in an introductory programming course

Net model composition and modification by net operations: a pragmatic approach