310 research outputs found
Survey of Technologies for Web Application Development
Web-based application developers face a dizzying array of platforms,
languages, frameworks and technical artifacts to choose from. We survey,
classify, and compare technologies supporting Web application development. The
classification is based on (1) foundational technologies; (2)integration with
other information sources; and (3) dynamic content generation. We further
survey and classify software engineering techniques and tools that have been
adopted from traditional programming into Web programming. We conclude that,
although the infrastructure problems of the Web have largely been solved, the
cacophony of technologies for Web-based applications reflects the lack of a
solid model tailored for this domain.Comment: 43 page
Secure telemedicine system for home health care
This thesis describes a low-cost telemedicine system that provides home based patient care by linking patients with skilled nurses at the home care agency. The system employs compact vital signs sensors and a two-way real-time video conference over telephone lines. It stores the patient\u27s medical records, still images and enforces clinical pathways during the televisits. Physicians, paramedics, and nurses can then have access to these records from anywhere, securely, through a Web browser.;This document discusses the underlying technologies, the features implemented in the prototype, and the methodologies used in developing the software. The prototype uses the Enterprise Java Bean [EJB] architecture and emphasizes security and scalability. Preliminary experience of its use is presented. A performance analysis of the system\u27s behavior if it were scaled up has also been done
An integrated component-oriented framework for effective and flexible enterprise distributed systems development
Although component-based platforms and technologies such as CORBA, COM+/.NET
and Enterprise Java Beans (EJB) are now widely used for implementation and
deployment of complex systems, the component way of thinking is still
immature. Current CBD best practices, concepts, approaches and methods do not
provide a full and consistent support for various component concepts, and
therefore are not able to provide a full benefit of the CBD paradigm. This
paper defines a new approach to components through an Integrated Component-
Oriented Framework that provides a comprehensive component-oriented support
for enterprise systems development. The framework enables that the same
component way of thinking and the same consistent set of technology-
independent component concepts can be applied in different aspects of
enterprise systems development, from business services to distributed
components
Managing the consistency of distributed documents
Many businesses produce documents as part of their daily activities: software engineers
produce requirements specifications, design models, source code, build scripts and more;
business analysts produce glossaries, use cases, organisation charts, and domain ontology
models; service providers and retailers produce catalogues, customer data, purchase orders,
invoices and web pages.
What these examples have in common is that the content of documents is often semantically
related: source code should be consistent with the design model, a domain ontology
may refer to employees in an organisation chart, and invoices to customers should be consistent
with stored customer data and purchase orders. As businesses grow and documents
are added, it becomes difficult to manually track and check the increasingly complex relationships
between documents. The problem is compounded by current trends towards
distributed working, either over the Internet or over a global corporate network in large
organisations. This adds complexity as related information is not only scattered over
a number of documents, but the documents themselves are distributed across multiple
physical locations.
This thesis addresses the problem of managing the consistency of distributed and possibly
heterogeneous documents. āDocumentsā is used here as an abstract term, and does not
necessarily refer to a human readable textual representation. We use the word to stand
for a file or data source holding structured information, like a database table, or some
source of semi-structured information, like a file of comma-separated values or a document
represented in a hypertext markup language like XML [Bray et al., 2000]. Document
heterogeneity comes into play when data with similar semantics is represented in different
ways: for example, a design model may store a class as a rectangle in a diagram whereas
a source code file will embed it as a textual string; and an invoice may contain an invoice
identifier that is composed of a customer name and date, both of which may be recorded
and managed separately.
Consistency management in this setting encompasses a number of steps. Firstly, checks
must be executed in order to determine the consistency status of documents. Documents
are inconsistent if their internal elements hold values that do not meet the properties
expected in the application domain or if there are conflicts between the values of elements
in multiple documents. The results of a consistency check have to be accumulated and
reported back to the user. And finally, the user may choose to change the documents to
bring them into a consistent state.
The current generation of tools and techniques is not always sufficiently equipped to deal
with this problem. Consistency checking is mostly tightly integrated or hardcoded into tools, leading to problems with extensibility with respect to new types of documents.
Many tools do not support checks of distributed data, insisting instead on accumulating
everything in a centralized repository. This may not always be possible, due to organisational
or time constraints, and can represent excessive overhead if the only purpose of
integration is to improve data consistency rather than deriving any additional benefit.
This thesis investigates the theoretical background and practical support necessary to
support consistency management of distributed documents. It makes a number of contributions
to the state of the art, and the overall approach is validated in significant case
studies that provide evidence of its practicality and usefulness
Current usage of Component based Principles for Developing Web Applications with Frameworks: A Literature Review
Component based software development has become a very popular paradigm in many software engineering branches. In the early phase of Web 2.0 appearance, it was also popular for web application development. From the analyzed papers, between this period and today, use of component based techniques for web application development was somewhat slowed down, however, the recent development indicates a comeback. Most of all it is apparent with W3Cās component web working group. In this article we want to investigate the current state of web application development with component approach. Most of all we are interested in which way components are used, which web development frameworks are being used, for which domains is component based web development most popular and successful, etc. How many current web development frameworks explicitly refer to component-based approach? To answer this question, we performed a literature review
Development of an Internet-Based Chronic Disease Self-Management System
Patient self-management programs and information systems that support them can improve the quality of healthcare. Flaws in user experience reduce the willingness of patients to adopt such systems. To explore how emerging technology such as rich Internet applications can be used to address the usability issues of personal health information systems, we developed a health self-management application that is based on an open-source framework. In this work we present the architecture of the system, discuss the issues we faced and lessons we learned while developing it. This work can help researchers and practitioners in evaluating approaches towards developing new generation of personal health solutions. Furthermore, this work serves as a basis for implementing a feature-rich system that can improve chronic disease self-management
Software engineering and middleware: a roadmap (Invited talk)
The construction of a large class of distributed systems can be simplified by leveraging middleware, which is layered between network operating systems and application components. Middleware resolves heterogeneity and facilitates communication and coordination of distributed components. Existing middleware products enable software engineers to build systems that are distributed across a local-area network. State-of-the-art middleware research aims to push this boundary towards Internet-scale distribution, adaptive and reconfigurable middleware and middleware for dependable and wireless systems. The challenge for software engineering research is to devise notations, techniques, methods and tools for distributed system construction that systematically build and exploit the capabilities that middleware deliver
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Towards an aspect weaving BPEL engine
This position paper proposes the use of dynamic aspects and
the visitor design pattern to obtain a highly configurable and
extensible BPEL engine. Using these two techniques, the
core of this infrastructural software can be customised to
meet new requirements and add features such as debugging,
execution monitoring, or changing to another Web Service
selection policy. Additionally, it can easily be extended to
cope with customer-specific BPEL extensions. We propose
the use of dynamic aspects not only on the engine itself
but also on the workflow in order to tackle the problems of
Web Service hot deployment and hot fixes to long running
processes. In this way, composing aWeb Service "on-the-fly"
means weaving its choreography interface into the workflow
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