Implementation Of Design Patterns Research Articles

Design Patterns for Developing High Efficiency Mobile Application

With the advent of technology, mobile devices are becoming powerful and they are widely used as convenient computing devices. In order to develop high quality application in a short period while overcoming the limitations and challenges in mobile development, strong knowledge and understanding of the design purpose are the key factors in developing well- designed applications. Good design ensures that crashes or harmful actions can be prevented as well as increasing users’ satisfaction. By implementing design patterns, developers can cater wide variety of users whereby they do not have to redevelop similar application for users who are using different types of devices. Application can be developed in a short period as developer can reuse design patterns to develop new application in similar domain. Our proposed work aims to implement design patterns to overcome limitations of current techniques and increase efficiency, usability and reusability in mobile application development.

Personal learning environments on the Social Semantic Web

Today's students, being used to constant activity and multitasking in their everyday life, need a high level of social and creative engagement in order to learn; for them, highly interactive learning environments which allow for communication, collaboration, and authoring, are a must. In addition, modern learning theories stress the importance of interactivity and engagement of students for successful learning processes, whereas recent empirical studies provide evidence and confirm this. In this paper, we present how the integration of Social and Semantic Web technologies, often referred to as the Social Semantic Web SSW, along with the Linked Data paradigm offer potentials for improving the interactivity of today's learning environments, while putting students in control of their learning process spanning across different tools and services. We identify the main principles on which such SSW-supported personal learning environments are based, and illustrate them through the design, implementation, analysis, and evaluation of DEPTHS DEsign Patterns Teaching Help System --a SSW-based interactive personal learning environment we have developed for the domain of software design patterns.

Implementing design patterns in Object Teams

SUMMARYThis paper presents a study of the support for modularity of Object Teams, an aspect‐oriented language backwards compatible with Java. The study is based on implementations in Object Teams of two complete collections of the Gang‐of‐Four design patterns. An analysis of the implementations is provided, in terms of advantages of Object Teams over Java with respect to modularity, module composition and reuse. We present a systematic comparison with a functionally equivalent collection of implementations in AspectJ, regarding five modularity properties: locality, reusability, composition transparency, (un)pluggability and extensibility. Object Teams yields broadly comparable results in terms of the first four properties. Object Teams yields better results as regards flexible module extensibility, composition at the instance level and enclosing multiple pattern participants into a larger, cohesive module. AspectJ is more successful than Object Teams in the Singleton pattern because of its ability to intercept constructor events. Copyright © 2012 John Wiley & Sons, Ltd.

Acceleration of moment method using CUDA

PurposeThe purpose of this paper is to accelerate the time‐consuming task of assembling the impedance matrix resulting from the discretization of integral equations by the moment method, accelerated using massively parallel processing scheme.Design/methodology/approachThis paper provides several approaches for the implementation of moment method on compute unified device architecture (CUDA) capable general purpose video cards, as well as giving general implementation design patterns and a good overview on the topic.FindingsThe proposed method seems to be efficient in the light of the presented numerical results.Originality/valueThe subject of the paper is an evolving, considerably new aspect among computation techniques which could be of high interest for the scientific community.

Design Patterns to Implement Safety and Fault Tolerance

This paper discusses an object orient approach based on design pattern and computational reflection concept to implement nonfunctional requirements of complex control system. Firstly we brief about software architecture design, followed by control-monitor safety pattern, Tri-Modular redundancy (TMR) pattern, reflective state pattern and fault tolerance redundancy patterns that are use for safety and fault management. Reflection state pattern is a refinement of the state design pattern based on reflection architectural pattern. With variation in reflective design pattern we can develop a well structured fault tolerant system. The main goal of this paper is to separate control and safety aspect from the application logic. It details its intent, motivation, participants, consequences and implementation of safety design pattern. General Terms Design pattern, Safety pattern, Fault tolerance.

E-learning frameworks: facilitating the implementation of educational design patterns

Educational design patterns hold the promise of facilitating the design of educational activities and environments. We have a number of completed initiatives and projects today, but none of them has had sustained impact on the practitioner community. In this paper, we argue that the use and usability of educational design patterns for technology-enhanced learning can be increased by complementing patterns with ready-to-use tools as part of an e-learning framework approach. We present two different approaches of conceiving such an e-learning framework: 1) an 'extension' approach that provides pattern-based, custom LMS components; 2) a 'facade' approach that enables the pattern-based reuse of existing LMS components. To demonstrate the feasibility and benefits of e-learning frameworks we present implementations of both approaches.

Application of refactoring and design pattern in land information system development

The unceasing change problem of land information systems can be resolved through the refactoring and design pattern. To promote the implementation of design pattern and refactoring methods in developing land information systems reusing software design, applying refactoring methods to the abstract factory and decorator design patterns in land information system development is discussed.

Comments on the Arjen Markus article

The article by Markus [1] discusses the subject of object-oriented (OO) design patterns and describes ways in which three well-known patterns might be implemented in Fortran 90/95. It appears that the idea of object-oriented design patterns in Fortran might just be coming of age and it is a very appropriate subject for discussion in a Forum such as this.We have been developing our own implementations of design patterns in Fortran 90/95 for some time and have one paper under review [2] and another being presented at the 6th Workshop on Parallel/High-Performance Object Oriented Scientific Computing (POOSC) in Nantes, France in July 2006 [3]. Our application area is particle-in-cell simulations in plasma physics, but the results that we have obtained will, we hope, be of interest to Fortran 90/95 programmers in general.Our own starting point with design patterns in Fortran 90/95 stems from the literature on object-based programming in that language [4-10]. Several authors have observed that the obvious unit of encapsulation, the Fortran 90/95 module, can be thought of as an object-based class : it can support a type which defines the stored data together with subprograms which can operate on that data. With some discipline and ingenuity, these authors have shown how to emulate the notions of object construction and destruction, inheritance and polymorphism. These emulations were actually implemented using object composition . For example, one child module might include another parent module in order to simulate inheritance. As Markus correctly points out, most of the famous design patterns are based on object composition and the authors of [4-10] have, frequently, been using design patterns as a way of simulating OO behaviour.Because the subject of OO design patterns in Fortran 90/95 is so fresh, there is ample scope for them to be presented in different ways by different authors. Whilst appreciating the clarity and relevance of Markus' expositions, we would like to make some points of criticism which we believe are important to a further discussion of this topic. The points we make refer to the ideas expressed in the book by Gamma et al. [11] which is considered to be the fundamental exposition of the topic of OO design patterns.

Reflective Designs — An Overview

We render runtime system adaptations by design-level concepts such that running systems can be adapted and examined at a higher level of abstraction. The overall idea is to express design decisions as applications of design operators to be carried out at runtime. Design operators can implement design patterns for use at runtime. Applications of design operators are made explicit as design elements in the running system such that they can be traced, reconfigured, and made undone.Our approach enables Reflective Designs: on one side, design operators employ reflection to perform runtime adaptations; on the other side, design elements provide an additional reflection protocol to examine and configure performed adaptations. Our approach helps understanding the development and the maintenance of the class of software systems that cannot tolerate downtime or frequent shutdown-revise-startup cycles.We have accumulated a class library for programming with Reflective Designs in Squeak/Smalltalk. This library employs reflection and dynamic aspect-oriented programming. We have also implemented tool support for navigating in a system that is adapted continuously at runtime.Note: This extended abstract summarises our full paper [Hirschfeld, R. and R. Lämmel, Reflective Designs, IEE Proceedings Software (2004), Special Issue on Reusable Software Libraries. To appear. Available at http://homepages.cwi.nl/~ralf/rd/].

Design pattern implementation in Java and aspectJ

AspectJ implementations of the GoF design patterns show modularity improvements in 17 of 23 cases. These improvements are manifested in terms of better code locality, reusability, composability, and (un)pluggability.The degree of improvement in implementation modularity varies, with the greatest improvement coming when the pattern solution structure involves crosscutting of some form, including one object playing multiple roles, many objects playing one role, or an object playing roles in multiple pattern instances.

FC++: Functional tools for object‐oriented tasks

AbstractFC++ is a library for programming functionally in C++. Compared to other C++ functional programming libraries, FC++ is distinguished by its powerful type system which allows the manipulation of parametrically polymorphic functions (e.g., passing them as arguments to other functions and returning them as results).In this paper, we show how FC++ can be used in common object‐oriented programming tasks. We demonstrate FC++ implementations of several common design patterns (Adapter, Builder, Command, and more). Compared to conventional C++ implementations of these patterns, our implementations are either simpler (in that fewer classes/dependencies are needed), more efficient, or more type‐safe (thanks to parametric polymorphism and type inference). Copyright © 2002 John Wiley & Sons, Ltd.

A UML-based design process for distributed data-acquisition and triggering systems in high-energy physics experiments

We present the first results in the elaboration of a design and development process that tackles recurrent problems encountered when developing acquisition and triggering systems for high-energy physics experiments., These problems include software/hardware frontier definition and the impact of both intrinsic and performance-related parallelism on software development. Based on the Unified Modeling Language and its extension mechanisms, the process aims at capturing rules, constraints, and simple mechanisms that 1) separate functional concerns from deployment specifications, including hardware-software separation and 2) transparently and automatically derive distribution patterns from system-level definitions. The process is intended to grow progressively into a design framework that will both enforce its rules and constraints and implement design patterns that result from our experience of high-energy physics trigger and data-acquisition system development.

Implementing design patterns as language constructs

No abstract available.

Automatic code generation from design patterns

Design patterns raise the abstraction level at which people design and communicate design of object-oriented software. However, the mechanics of implementing design patterns is left to the programmer. This paper describes the architecture and implementation of a tool that automates the implementation of design patterns. The user of the tool supplies application-specific information for a given pattern, from which the tool generates all the pattern-prescribed code automatically. The tool has a distributed architecture that lends itself to implementation with off-the-shelf components.