| Title: |
O2PDGS:
AN APPROACH FOR UNDERSTANDING OBJECT ORIENTED PROGRAMS |
| Author(s): |
Hamed
Al-Fawareh |
| Abstract: |
In this paper, we provide a description of dependence
graphs for representing meaningful dependencies between components of
object-oriented programs. A formal description of the dependence relations
of interest is given before giving a representative illustration of
object-oriented program dependence graphs (O2PDGs). The paper also
discusses an approach for understanding object-oriented programs through
the use of O2PDGs. |
|
| Title: |
ERP
SYSTEMS IMPLEMENTATION DETERMINANTS AND SUCCESS MEASURES IN CHINA: A CASE
STUDY APPROACH |
| Author(s): |
Christy Cheung,
Zhe Zhang, Matthew Lee, Liang Zhang |
| Abstract: |
With the growing intensive global competition and
integration of the world economy, manufacturing firms have to reduce
inventory level and operation costs, improve customer service to obtain
competitive advantage against their competitors. Manufacturing companies
are forced to adopt new methods to achieve the above objectives.
Enterprise resource planning (ERP) system is one of the most widely
accepted choices. AMR predicts the total ERP market will reach $66.6
billion by 2003, growing an estimated 32% annually over the next five
years. Significant benefits such as improved customer service, better
production scheduling, and reduced manufacturing costs can accrue from the
successful implementation of ERP (Ang et al, 1995). However, the
successful implementation rate is extremely low especially in China and
many firms didn’t achieve intended goals. Thus, it’s necessary for ERP
practitioners and researchers to investigate the reasons why the
implementation success rate of ERP systems in China is so low. Prior
studies mainly focus on critical success factors or single ERP
implementation success measure without theoretical support. This study
attempts to combine Ives, Hamilton, and Davis (1980) MIS research model
and DeLone & McLean’s (1992) IS success model to develop an ERP
implementation success model, identifying both generic and unique factors
that affect ERP systems implementation success in China and using multiple
ERP implementation success measures to assess whether an ERP
implementation is a success or failure. Through multiple case study
research method, more detailed information about ERP implementations could
be collected. Moreover, it solves problems of validity and reliability of
constructs occurring frequently in a single case study. The results of
this research can help ERP-related researchers, practitioners, and
companies to get more comprehension of ERP systems implementation issues
and the chance of ERP implementation success could be increased given
enough attention to these issues. |
|
| Title: |
DATA
WAREHOUSING: A REPOSITORY MODEL FOR METADATA STORAGE AND RETRIEVAL BASED
ON THE HUMAN INFORMATION PROCESSING |
| Author(s): |
Enrique Luna-Ramírez,
Félix García-Merayo, Covadonga Fernández-Baizán |
| Abstract: |
The information on the creation, management and use of a
data warehouse is stored in what is called the metadata repository, making
this repository the single most important component of the data warehouse.
Accordingly, the metadata repository plays a fundamental role in the
construction and maintenance of the data warehouse, as well as for
accessing the data it stores. In this paper, we propose a repository model
conceived to store and retrieve the metadata of a corporation data
warehouse. With a view to achieving this objective, the model, composed of
an approach for modelling the repository structure and by a metamodel for
retrieving metadata, is based on the human information processing
paradigm. So, the model considers a series of distinctive functionalities
that can be built into a repository system to assure that it works
efficiently. These functionalities refer to the use of two memories for
storing the repository metadata and a set of structures and processes for
retrieving the information passing from one memory to another. One of the
memories in particular is used to store the most recurrent metadata in a
corporate environment, which can be rapidly retrieved with the help of the
above-mentioned structures and processes. These structures and processes
also serve to contextualise the information of a data warehouse according
to the projects or business areas to which it refers. |
|
| Title: |
HOSPITAL
CASE RECORDS INFORMATION SYSTEM: CASE STUDY OF A KNOWLEDGE-BASED
PRODUCT |
| Author(s): |
A. Neelameghan,
M. Vasudevan |
| Abstract: |
Briefly discusses knowledge management and use of
knowledge-based products in enterprises. Enumerates the information
resources of a hospital and describes the design and development of a
patients’ case records system, specifically for a hospital specializing in
surgical cases of tumors of the central nervous system. Each case record
has data / information on over 150 attributes of patient, facility for
hypertext linking relevant images (CT scan, X-ray, NMR, etc.) and access
to electronic documents from other websites. The collaborative roles of
the hospital doctors and a consultant information specialist in the
development of the system are indicated. Output of a case record with
links to related CT scan pictures and a web document is presented as
example. Concludes mentioning the various uses of the system. |
|
| Title: |
MODELS
FOR IMPLEMENTATION OF ONLINE REAL TIME IT-ENABLED SERVICE FOR ENTRY TO
PROFESSIONAL EDUCATION |
| Author(s): |
Natesan
T.R, V. Rhymend Uthariaraj, George Washington .D.
|
| Abstract: |
Any agency selecting candidates for admission to any
professional education has to administer a common entrance examination,
evaluate the responses and offer seats accoring to their merit. This task
has two parts viz., conduct of examination and admission. In this paper a
process oriented data model for the conduct of examination and admission
process has been developed and implemented, based on statistical and
mathematical models. The schedule for online real time registration for
the examination at various centres is based on a statistical model and the
centres for the conduct of counselling are selected based on a
mathematical programming model. This system has been implemented through
online real time distributed database with secured Virtual Private Network
(VPN) |
|
| Title: |
STORAGE
OF COMPLEX BUSINESS RULES IN OBJECT DATABASES |
| Author(s): |
Dalen Kambur,
Mark Roantree |
| Abstract: |
True integration of large systems requires sharing of
information stored in databases beyond sharing of pure data: business
rules associated with this data must be shared also. This research focuses
on providing a mechanism for defining, storing and sharing business rules
across different information systems, in an area where existing
technologies are weak. In this paper, we present the pre-integration stage
where individual business rules are stored in the database for subsequent
exchange applications and information systems. |
|
| Title: |
A
GRAPHICAL LANGUAGE FOR DEFINING VIEWS IN OBJECT ORIENTED
DATABASES |
| Author(s): |
Elias Choueiri,
Marguerite Sayah |
| Abstract: |
Within the framework of an Object Oriented Database
Graphical Query Environment for casual end users, a View Definition
Mechanism conceived for users who are expert in their application domain,
but not necessarily computer specialists, is proposed in this paper. In
this mechanism, a concentration is made on the strength of the graphical
view definition language and on the conviviality of the user interface.
The view definition language offers adaptation operations to the work
context and restructuring operations on both attributes and classes that
take into consideration the structure’s nesting and inheritance of the
database classes. The user interface conviviality is based on the
graphical visualization of the portion of the database schema that
represents the domain of interest for a user group, and on the use of the
graphical language for view definition. To eliminate crossings between
different links of the visualized composition hierarchy, a method for
graphical visualization is introduced. |
|
| Title: |
A
TRANSPARENT CLIENT-SIDE CACHING APPROACH FOR APPLICATION SERVER
SYSTEMS |
| Author(s): |
Daniel Pfeifer,
Zhenyu Wu |
| Abstract: |
In recent years, application server technology has become
very popular for building complex but mission-critical systems. However,
the resulting solutions tend to suffer from serious performance and
scalability bottlenecks, because of their distributed nature and their
various software layers. This paper deals with the problem by presenting a
new approach about transparently caching results of a service interface's
read-only methods on the client side. Cache consistency is provided by a
descriptive cache invalidation model which may be specified by an
application programmer. As the cache layer is transparent to the server as
well as to the client code, it can be integrated with relatively low
effort even in systems that have already been implemented. Early
experimental results show that the approach is effective in improving a
server's response times and its transactional throughput. Roughly
speaking, the overhead for cache maintenance is small when compared to the
cost for method invocations on the server side. The cache's performance
improvements are dominated by the fraction of read method invocations and
the cache hit rate. Moreover, the cache can be smoothly integrated with
traditional caching strategies acting on other system layers (e. g.
caching of dynamic Web pages on a Web server). The presented approach as
well as the related prototype are not restricted to application server
scenarios but may be applied to any kind of interface-based software
layers. |
|
| Title: |
EFFICIENT
STORAGE FOR XML DATABASES |
| Author(s): |
Weiyi Ho,
Dave Elliman, Li Bai |
| Abstract: |
The widespread activity involving the Internet and the Web
causes huge amount of electronic data to be generated everyday. This
includes, in particular, semi-structured textual data such as electronic
documents, computer programs, log files, transaction records, literature
citations, and emails. Storing and manipulating the data thus produced has
proven difficult. As conventional DBMSs are not suitable for handling
semi-structured data, there is a strong demand for systems that are
capable of handling large volumes of complex data in an efficient and
reliable way. The Extensible Markup Language (XML) provides such solution.
In this paper, we present the concept of ‘vertical view model’ and its
uses as a mapping mechanism for converting complex XML data to relational
database tables, and as a standalone data model for storing complex XML
data. |
|
| Title: |
DATA
MANAGEMENT: THE CHALLENGE OF THE FUTURE |
| Author(s): |
Alan Hodgett
|
| Abstract: |
There has been an explosion in the generation of data in
organizations. Much of this data is both unstructured and decentralized.
This raises a number of issues for data management in organizations. This
paper reports on an investigation that was undertaken in Australia to
study the way in which organizations were dealing with the growth and
proliferation of data and are planning for the future. The results show a
high level of consciousness of the issues but indicate a prevalent
optimism that technology will continue to provide solutions to present and
future problems facing organizations. It appears that much magnetically
recorded data will inevitably be lost over the next few decades unless
positive actions are taken now to preserve the data. |
|
| Title: |
TOWARDS
A TIMED-PETRI NET BASED APPROACH FOR THE SYNCHRONIZATION OF A MULTIMEDIA
SCENARIO |
| Author(s): |
Abdelghani GHOMARI
|
| Abstract: |
This article proposes a new approach for the
synchronization of a multimedia scenario based on a new class of
p-temporal Petri nets called p-RdPT+. One essential phase during the
synchronization of multimedia scenario is related to the characterization
of their logical and temporal structure. This structure is expressed
through a set of composition rules and synchronization constraints depend
on user interactions. An inconsistent situation is detected when some of
the constraints specified by the author can not be met during the
presentation. Hence, our approach permits verification of the
specification by temporal simulation of the Petri net automatically
generated or by analysing the graph of accessibility derived from the
generated p-RdPT+ model. |
|
| Title: |
PLANNING
FOR ENTERPRISE COMPUTING SERVICES: ISSUES AND NECESSITIES ANALYZED
|
| Author(s): |
Jason Tseng,
Emarson Victoria |
| Abstract: |
While planning, simulation and modeling tools exist for
fields like network management and capacity/workload planning, little is
known about automated planning tools for computing services. Considering
the complexities and difficulties in deploying and managing computing
infrastructure and services, we need to examine their planning processes
instead, to augment existing enterprise management and planning solutions.
In this paper, we present the motivation and advantages of a planning tool
that automates the planning of computing services. This requires us to
consider the issues and problems in deploying and managing computing
services and their infrastructure. It allows us to understand why and how,
such a planning tool can be used to alleviate, if not eliminate some of
these problems. The planning tool works by actively abstracting properties
of actual computing components using an information model/framework and
formulating rules to analyze and automate the planning activity, using
only abstracted component representations. This will pave the way for
plans that closely reflect the actual computing environment, thus allowing
users to leverage the flexibility and virtualization in the planning
environment |
|
| Title: |
EXTENDING
GROUPWARE FOR OLAP |
| Author(s): |
Sunitha Kambhampati,
Daniel Ford, Vikas Krishna, Stefan Edlund |
| Abstract: |
While applications built on top of groupware systems are
capable of managing mundane tasks such as scheduling and email, they are
not optimised for certain kinds of applications, for instance generating
aggregated summaries of scheduled activities. Groupware systems are
primarily designed with online transaction processing in mind, and are
highly focused on maximizing throughput when clients concurrently access
and manipulate information on a shared store. In this paper, we give an
overview and discuss some of the implementation details of a system that
transforms groupware Calendaring & Scheduling (C&S) data into a
relational OLAP database optimised for these kinds of analytical
applications. We also describe the structure of the XML documents that
carry incremental update information between the source groupware system
and the relational database, and show how the generic structure of the
documents enables us to extend the infrastructure to other groupware
systems as well. |
|
| Title: |
REPCOM:
A CUSTOMISABLE REPORT GENERATOR COMPONENT SYSTEM USING XML-DRIVEN,
COMPONENT-BASED DEVELOPMENT APPROACH |
| Author(s): |
Sai
Peck Lee, Chee Hoong Leong |
| Abstract: |
It is undeniable that report generation is one of the most
important tasks in many companies regardless of the size of the company. A
good report generation mechanism can increase a company’s productivity in
terms of effort and time. This is more obvious in some startup companies,
which normally use some in-house report generators. Application
development could be complex and thus software developers might require
substantial efforts in maintaining application program code. In addition,
most of the report generators use a different kind of format to store the
report model. An application is no longer considered an enterprise-level
product if XML is not being used elsewhere. This paper introduces a
XML-driven and Component-based development approach to report generation
with the purpose of promoting portability, flexibility and genericity. In
this approach, report layout is specified using user-defined XML elements
together with queries that retrieve data from different databases. A
report is output as an HTML document, which can be viewed using an
Internet browser. This paper presents the approach using an example and
discusses the usage of the XML-driven report schema and how the proposed
reusable report engine of a customisable report generator component system
works to output an HTML report format. The customisable report generator
component system is implemented to support heterogeneous database
models |
|
| Title: |
E-LEARNING
INFORMATION MANAGEMENT ISSUES IN XML-BASED MEDIATION |
| Author(s): |
Boris Rousseau,
Eric Leray, Micheal O'Foghlu |
| Abstract: |
The advancement in XML-based mediation has made a
significant impact on the area of E-Learning. Search engines have now been
provided with new ways to improve resource discovery and new tools to
customise resulting content. In the early days of XML, this work was
undertaken within the context of the European funded project GESTALT
(Getting Educational System Talk Across Leading Edge Technologies).
Building on this experience, new improvement came from the European funded
project GUARDIANS (Gateway for User Access to Remote Distributed
Information And Network Services). However, due to the lack of support for
native XML databases and XML querying languages, search facilities were
limited. This paper builds upon the achievements of both projects and
proposes a solution for XML querying in XQuery. |
|
| Title: |
THE
KINDS OF IT SERVICES MOST APPROPRIATE FOR A PARTICULAR SOURCING
STRATEGY |
| Author(s): |
Patrick Wall,
Larry Stapleton |
| Abstract: |
IT processes and services often differ with regard to
which sourcing strategies suits them best. The significance of IT within
any given organization and the ability of that organization to provide an
efficient and innovative information system on its own often determines
what sourcing strategy it chooses. However, it is viewed as a better
strategy to identify certain IT processes that can be maintained
internally and then outsource those that the firm sees would be maintained
better by an external vendor. This paper identifies the most commonly
insourced, outsourced and selectively sourced IT activities and then asks
the question of why is this the case. |
|
| Title: |
ERP
IMPLEMENTATION, CROSS-FUNCTIONALITY AND CRITICAL CHANGE FACTORS |
| Author(s): |
Rolande Marciniak,
Redouane El Amrani, Frantz Rowe, Marc Bidan, Bénédicte
Geffroy-Maronnat |
| Abstract: |
ERP (Enterprise Resource Planning) systems are
characterised by particular features such as functional coverage,
interdependent relationships, single database and standard management and
processing rules; all of which are capable of bringing about various
degrees of change within the company and, potentially, encourage a more
cross-functional overview of it. However, few quantitative studies have
been conducted to measure these effects. This is the background to this
paper, which studied 100 French companies to arrive at the following
assessment of ERP adoption. It then goes on to test the relationships
between the factors influencing the ERP lifecycle ((preparation
(organizational vision, process re-engineering), engineering (specific
developments), implementation strategy (functional coverage and speed)),
the perception of a more cross-functional overview of the company and,
more globally, the scope of the change this technology brings about within
the company. All these factors play significant roles, with functional
coverage appearing to be a particularly important consideration, which
should be addressed in future research. |
|
| Title: |
LAB
INFORMATION MANAGEMENT SYSTEM FOR QUALITY CONTROL IN WINERIES |
| Author(s): |
Manuel Urbano
Cuadrado, Maria Dolores Luque de Castro, Pedro Perez Juan |
| Abstract: |
The great number of analysis necessary to carry out during
the wine production, as well as the storage, treatment and careful study
and discussion of the data these analyses provide is of paramount
importance for taking correct decisions for a better quality of both the
winery and the wine it produces. We describe a system devote to overall
management of information generate in the wine production processes. The
system based on otirntation to objects technology allows quality control
of the wine production in wineries and enables the integration of
semiautomated and automated analytical processes. |
|
| Title: |
INFORMATION
SYSTEMS IN MEDICAL IMAGERY: CASE OF THE HOSPITAL OF BAB EL OUED |
| Author(s): |
Abdelkrim MEZIANE
|
| Abstract: |
The digital medical images got by the different existing
modalities, and processed by powerful computers, became a very powerful
means of diagnosis and economy. In Algeria, the patient is responsible of
the images which are delivered to him. These images are most of the time,
lost, not identified (name, date,…), or simply damaged for many reasons.
Doctors and radiologists are sometimes, if not most of the time, obliged
to ask the same patient to make the same radiography several times. The
Algerian park of medical images tools is not well known or exhaustively
assessed. The Algerian government reserves an important part of its budget
to health medical care. A part of this budget goes to complementary
medical tests, such as very expensive images paid by the taxpayer. Some
solutions do exist in order to reduce these costs, by investing a small
amount of money at the beginning. |
|
| Title: |
SHIFTING
FROM LEGACY SYSTEMS TO A DATA MART AND COMPUTER ASSISTED INFORMATION
RESOURCES NAVIGATION FRAMEWORK |
| Author(s): |
Nikitas Karanikolas, Christos Skourlas |
| Abstract: |
Computer Assisted Information Resources Navigation (CAIRN)
was specified, in the past, as a framework that allows the end-users to
import and store full text and multimedia documents and then retrieve
information using Natural Language or field based queries. Our CAIRN
system is a general tool that has focused on medical information covering
the needs of physicians. Today, concepts related to Data Mining and Data
Marts have to be incorporated into such a framework. In this paper a
CAIRN-DAMM (Computer Assisted Medical Information Resources Navigation
& Diagnosis Aid Based On Data Marts & Data Mining) environment is
proposed and discussed. This integrated environment offers: document
management, multimedia documents retrieval, a Diagnosis–aid subsystem and
a Data Mart subsystem that permits the integration of legacy system’s
data. The diagnosis is based on the International Classification of
Diseases and Diagnoses, 9th revision (ICD-9). The document collection
stored in the CAIRN-DAMM system consists of data imported from the
Hospital Information System (HIS), laboratory tests extracted from the
Laboratory Information System (LIS), patient discharge letters,
ultrasound, CT and MRI images, statistical information, bibliography, etc.
There are also methods permitting us to propose, evaluate and organize in
a systematic way uncontrolled terms and to propose relationships between
these terms and ICD-9 codes. Finally, our experience from the use of the
tool for creating a Data Mart at the ARETEION University Hospital is
presented. Experimental results and a number of interesting observations
are also discussed. |
|
| Title: |
ON
OPERATIONS TO CONFORM OBJECT-ORIENTED SCHEMAS |
| Author(s): |
Alberto Abelló,
Elena Rodriguez, Elena Rodríguez, Marta Oliva,
José Samos, Fèlix Saltor, Eladio Garví |
| Abstract: |
To build a Cooperative Information System from several
pre-existing heterogeneous systems, the schemas of these systems must be
integrated. Operations used for this purpose include conforming
operations, which change the form of a schema. In this paper, a set of
primitive conforming operations for Object-Oriented schemas are presented.
These operations are organized in matrixes according to the
Object-Oriented dimensions -Generalization/Specialization,
Aggregation/Decomposition- on which they operate. |
|
| Title: |
A
MULTI-LEVEL ARCHITECTURE FOR DISTRIBUTED OBJECT BASES |
| Author(s): |
Markus Kirchberg
|
| Abstract: |
The work described in this article arises from two needs.
First, there is still a need for providing more sophisticated database
systems than just relational ones. Secondly, there is a growing need for
distributed databases. These needs are adressed by fragmenting schemata of
a generic object data model and providing an architecture for its
implementation. Key features of the architecture are the use of abstract
communicating agents to realize database transactions and queries, the use
of an extended remote procedure call to enable remote agents to
communicate with one another, and the use of multi-level transactions.
Linguistic reflection is used to map database schemata to the level of the
agents. Transparency for the users is achieved by using dialogue objects,
which are extended views on the database. |
|
| Title: |
INVESTIGATING
THE EFFECTS OF IT ON ORGAISATIONAL DESIGN VARIABLES , TOWARDS A
THEORETICAL FRAMEWORK |
| Author(s): |
Rahim Ghasemiyeh,
Feng Li |
| Abstract: |
Over the past decades many papers have been published
about the effects of Information Technology (IT) on organisations. However
despite the facts that IT has become a fundamental variable for
organisational design very few studies have been done to explore this
vital issue in a systematic and convincing fashion. The small amount of
information and few theories available on the effects of IT on
organisational design is surprising. Also one major efficiency of previous
studies is the lack of empirical evidence. This has led researchers to
describe IT in general ways and resulted in different and very often
contradictory findings. Many researchers have become very concerned about
the shortfall of comprehensive study on organizational design and IT which
has been apparent for decades. One objective of this research is to fill
this gap. This study will investigate three questions, aiming to develop a
theoretical framework to evaluate the effects of IT on organisational
design,. What are the effects of IT on organisational design variables?
How IT influences organisational design variables? Which effects are
resulted from which IT technologies? These could be considered as the most
important features of this study, which are different with respect to
previous literature. |
|
| Title: |
SERVICES
PROVIDERS’ PATTERNS FOR CLIENT/SERVER APPLICATIONS |
| Author(s): |
Samar TAWBI,
Bilal CHEBARO |
| Abstract: |
In this paper, we define two patterns that fall under the
category of the architectural patterns described in (Shaw, 1996), to
provide solutions for client-server applications. The first pattern
defines the structure of a client-server application by defining the
server's functionality in the form of standardized services, and the
second defines the structure of a service in this type of application. The
solution follows the patterns’ definition prototype used in (Gamma,
1995). |
|
| Title: |
A
DISTRIBUTED JOB EXECUTION ENVIRONMENT USING ASYNCHRONOUS MESSAGING AND WEB
TECHNOLOGIES |
| Author(s): |
Rod Fatoohi,
Nihar Gokhale |
| Abstract: |
This is a project for developing an asynchronous approach
to distributed job execution of legacy code. A job execution environment
is a set of tools used to run jobs, generated to execute a legacy code,
and handles different input and output values for each run. Current job
execution and problem solving environments are mostly based on synchronous
messaging and customized API that needs to be ported to different
platforms. Here we are introducing an Internet-based job execution
environment using off-the-shelf J2EE (Java 2 Enterprise Edition)
components. The environment allows the execution of computational
algorithms utilizing standard Internet technologies such as Java, XML, and
asynchronous communication protocols. Our environment is based on
four-tier client/server architecture and uses Java messaging, for
inter-process communication, and XML fro job specification. It has been
tested successfully using several legacy simulation codes on pools of
Windows 2000 and Solaris systems. |
|
| Title: |
DRUID:
COUPLING USER WRITTEN DOCUMENTS AND DATABASES |
| Author(s): |
André
Flory, Frédérique Laforest, Youakim BADR |
| Abstract: |
Most database applications capture their data using
graphical forms. Text fields have limited size and predefined types.
Although data in fields are associated with constrains, it should be
modeled in a suitable way to conform to a rigid schema. Unfortunately, too
much constrains on data are not convenient in human activities where most
activities are document-centric. In fact, documents become a natural way
for human production and consumption. Nowadays, an increased interest is
put on managing data with irregular structures, exchanging documents over
the net, and manipulating their contents as efficiently as with structured
data. In this paper, we introduce DRUID, a comprehensive document
capturing and wrapping system. It ensures flexible and well-adapted
information capture based on a Document User Interface and at the same
time information retrieval based on databases. DRUID relies on a wrapper
that transforms documents contents into relevant data. Also, it provides
an expressive specification language for end-users to write domain-related
extraction patterns. We validate our information system with a prototype
of different modules, the primary realization is promising for a wide
range of applications that use documents as a mean to store, exchange and
query information. |
|
| Title: |
TOWARD
A FRAMEWORK FOR MANAGING INTERNET-ORIENTED DATABASE RESOURCES |
| Author(s): |
Guozhou Zheng,
Chang Huang, Zhaohui Wu |
| Abstract: |
The term “Grid” is used to describe those architectures
that manage the distributed resources across the Internet. This paper is
intended to introduce the Database Grid, an Internet oriented resource
management architecture for database resource. We identify the basic
requirements on database in two major application domains: e-science and
e-business. Next, we illustrate how a layered service architecture can
fulfil these emerging data sharing and data management requirements from
Grid computing application. We introduce a series of protocols to define
the proposed services. |
|
| Title: |
A
FRAMEWORK FOR GENERATING AND MAINTAINING GLOBAL SCHEMAS IN HETEROGENEOUS
MULTIDATABASE SYSTEMS |
| Author(s): |
Rehab Duwairi
|
| Abstract: |
The problem of creating a global schema over a set of
heterogeneous databases is becoming more and more important due the
availability of multiple databases within organizations. The global schema
should provide a unified representation of local (possibly heterogeneous)
local schemas by analyzing them (to exploit their semantic contents),
resolving semantic and schematic discrepancies among them, and producing a
set of mapping functions that translate queries posed on the global schema
to queries posed on the local schemas. In this paper, we provide a general
framework that supports the integration of local schemas into a global
one. The framework takes into consideration the fact that local schemas
are autonomous and may evolve over time, which makes the definition of the
global schema obsolete. We define a set of integration operators that
integrates local schemas, based on the semantic relevance of their
classes, into a set of virtual classes that constitute the global schema.
We also define a set of modifications that can be applied to local schemas
as a consequence of their local autonomy. For every local modification, we
define a propagation rule that will automatically disseminate the effects
of that modification to the global schema without having to regenerate it
from scratch via integration. |
|
| Title: |
A
SCALABLE DISTRIBUTED SEARCH ENGINE FOR INTRANET INFORMATION
RETRIEVAL |
| Author(s): |
Minoru Uehara,
Minoru Udagawa, Yoshifumi Sakai, Hideki Mori,
Nobuyoshi Sato |
| Abstract: |
Intranet information retrieval is very important for
corporations in business. They are trying to discover the useful knowledge
from hidden web pages by using data mining, knowledge discovery and so on.
In this process, search engine is useful. However, conventional search
engines, which are based on centralized architecture, are not suited for
intranet information retrieval because intranet information is frequently
updated. Centralized search engines take a long time to collect web pages
by crawler, robots and so on. So, we have developed a distributed search
engine, called Cooperative Search Engine (CSE), in order to retrieve fresh
information. In CSE, a local search engine located in each Web server
makes an index of local pages. And, a Meta search server integrates these
local search engines in order to realize a global search engine. In such a
way, the communication delay occurs at retrieval time. So, we have
developed several speedup techniques in order to realize fast retrieval.
As this result, we have succeeded in increasing the scalability of CSE. In
this paper, we describe speedup techniques and evaluate them. |
|
| Title: |
A
WEB APPLICATION FOR ENGLISH-CHINESE CROSS LANGUAGE PATENT
RETRIEVAL |
| Author(s): |
Wen-Yuan Hsiao,
Jiangping Chen, Elizabeth Liddy |
| Abstract: |
This paper describes an English-Chinese cross language
patent retrieval system built on a commercial database management
software. The system makes use of various software products and lexical
resources for the purpose of helping English native speakers to search for
Chinese patent information. This paper reports the overall system design
and cross language information retrieval (CLIR) experiments conducted for
performance evaluation. The experimental results and the follow-up
analysis demonstrated that commercial database systems could be used as an
IR system with reasonable performance. Better performance could be
achieved if the translation resources were customized to the document
collection of the system, or more sophisticated translation disambiguation
strategies were applied. |
|
| Title: |
TRIGGER-BASED
COMPENSATION IN WEB SERVICE ENVIRONMENTS |
| Author(s): |
Randi Karlsen,
Thomas Strandenaes |
| Abstract: |
In this paper we describe a technique for implementing
compensating transactions, based on the active database concept of
triggers. This technique enables specification and enforcement of
compensation logic in a manner that facilitates consistent and
semi-automatic compensation. A web service, with its loosely-coupled
nature and autonomy requirements, represents an environment well suited
for this compensation mechanism. |
|
| Title: |
AN
ARCHITECTURE OF A SECURE DATABASE FOR NETWORKED COLLABORATIVE
ACTIVITIES |
| Author(s): |
Akira
Baba, Michiharu Kudo, Kanta Matsuura, Kanta Matsuura
|
| Abstract: |
Open network can be used for many purposes, e-commerce or
e-government, etc. Different from those conventional applications, we
consider networked collaborative activities, for example networked
research activities. This application might be very useful and research
activities could be significantly promoted. However, we must care about
many security problems. Among those problems, we focus on an architecture
of a secure database in this paper. The design of such an architecture is
not a trivial task, since the data sets in database could be composed of
wide range of data types, and each data type needs to satisfy its own
security properties, including not only security but also an appropriate
management of intellectual-property right, and so on. Thus, we design an
architecture of a secure database, considering data types and various
security operations. |
|
| Title: |
USING
INFORMATION TECHNOLOGIES FOR MANAGING COOPERATIVE INFORMATION AGENT-BASED
SYSTEMS |
| Author(s): |
Nacereddine ZAROUR,
Mahmoud BOUFAIDA, Lionel SEINTURIER |
| Abstract: |
One of the most important problems encountered by the
cooperation among distributed infomation systems is that of heterogeneity
that is often not easy to deal with. This problem requires the use of the
best combination of software and hardware components for each
organization. However, the few suggested approaches for managing virtual
factories have not led to satisfaction. Along with motivating the
importance of such systems, this paper describes the major design goals of
agent-based architecture for supporting the cooperation of heterogeneous
information systems. It also shows how this architecture can be
implemented using the combination of XML and CORBA technologies. This
combination guarantees the interoperability of legacy systems regardless
respectiveley of their data models and platforms heterogeneity and,
therefore, improves the cooperation process. Examples are given from the
supply chains of manufacturing enterprises. |
|
| Title: |
MODELING
A MULTIVERSION DATA WAREHOUSE: A FORMAL APPROACH |
| Author(s): |
Tadeusz Morzy,
Robert Wrembel |
| Abstract: |
A data warehouse is a large centralized repository that
stores a collection of data integrated from external data sources (EDSs).
The purpose of building a data warehouse is: to provide an integrated
access to distributed and usually heterogeneous information, to provide a
platform for data analysis and decision making. EDSs are autonomous in
most of the cases. In a consequence, their content and structure change in
time. In order to keep the content of a data warehouse up to date, after
source data changed, various warehouse refreshing techniques have been
developed, mainly based on an incremental view maintenance. A data
warehouse will also need refreshing after a schema of an EDS changed. This
problem has, however, received little attention so far. Few approaches
have been proposed and they tackle the problem by using mainly temporal
extensions to a data warehouse. Such techniques expose their limitations
in multi–period quering. Moreover, in order to support predictions of
trends by decision makers what–if analysis is often required. For these
purposes, multiversion data warehouses seem to be very promising. In this
paper we propose a model of a multiversion data warehouse, and show our
prototype implementation of such a multiversion data warehouse. |
|
| Title: |
TRADDING
PRECISION FOR TIMELINESS IN DISTRIBUTED REAL-TIME DATABASES |
| Author(s): |
Bruno SADEG
|
| Abstract: |
Many information systems need not to obtain complete or
exact answers to queries submitted via a DBMS (Database Management
System). Indeed, in certain real-time applications, incomplete results
obtained timely are more interesting than complete results obtained late.
When the applications are distributed, DBMSs on which these applications
are based have a main problem of managing the transactions (concurrency
control and commit processes). Since these processes must be done timely
(such as each transaction meets its deadline), committing transactions
timely seems to be the main issue. In this paper, we deal with the global
distributed transaction commit and the local concurrency control problems
in applications where transactions may be decomposed into a mandatory part
and an optional part. In our model, the means to determine these parts is
based on a weight parameter which is assigned to each subtransaction. It
is used to help the coordinator process to execute the commit phase when a
transaction is close to its deadline. An other parameter, the estimated
execution time, is used by each participant site in combination with the
weight to solve the possible conflicts that may occur between local
subtransactions. The mechanisms used to deal with these issues is called
RT-WEP (Real-Time-Weighted Early Prepare) protocol. Some simulation have
made to compare RT-WEP protocol with two other protocols designed to the
same purpose. The results have shown that RT-WEP protocol may be applied
efficiently in a distributed real-time context by allowing more
transactions to meet their deadlines. |
|
| Title: |
A
MODEL-DRIVEN APPROACH FOR ITEM SYNCHRONIZATION AND UCCNET INTEGRATION IN
LARGE E-COMMERCE ENTERPRISE SYSTEMS |
| Author(s): |
Santhosh Kumaran,
Fred Wu, Simon Cheng, Mathews Thomas,
Santhosh Kumaran, Amaresh Rajasekharan, Ying Huang
|
| Abstract: |
The pervasive connectivity of the Internet and the
powerful architecture of the WWW are changing many market conventions and
creating a tremendous opportunity for conducting business on the Internet.
Digital marketplace business models and the advancement of Web related
standards are tearing down walls within and between different business
artifacts and entities at all granularities and at all levels, from
devices, operating systems and middleware to directory, data, information,
application, and finally the business processes. As a matter of fact,
business process integration (BPI), which entails the integration of all
the facets of business artifacts and entities, is emerging as a key IT
challenge. In this paper, we describe our effort in exploring a new
approach to address the complexities of BPI. More specifically, we study
how to use a solution template based approach for BPI and explore the
validity of this approach with a frequently encountered integration
problem, the item synchronization problem for large enterprises. The
proposed approach can greatly reduce the complexities of the business
integration task and reduce the time and amount of effort of the system
integrators. Different customers are deploying the described Item
Synchronization system. |
|
| Title: |
DATA
POSITION AND PROFILING IN DOMAIN-INDEPENDENT WAREHOUSE CLEANING |
| Author(s): |
Ajumobi Udechukwu,
Christie Ezeife |
| Abstract: |
A major problem that arises from integrating different
databases is the existence of duplicates. Data cleaning is the process for
identifying two or more records within the database, which represent the
same real world object (duplicates), so that a unique representation for
each object is adopted. Existing data cleaning techniques rely heavily on
full or partial domain knowledge. This paper proposes a positional
algorithm that achieves domain independent de-duplication at the attribute
level. The paper also proposes a technique for field weighting through
data profiling, which, when used with the positional algorithm, achieves
domain-independent cleaning at the record level. Experiments show that the
positional algorithm achieves more accurate de-duplication than existing
algorithms. |
|
| Title: |
OPTIMIZING
ACCESS IN A DATA INTEGRATION SYSTEM WITH CACHING AND MATERIALIZED DATA
|
| Author(s): |
Bernadette Farias
Lóscio, Ana Carolina Salgado, Maria da Conceição Moraes Batista
|
| Abstract: |
Data integration systems are planned to offer uniform
access to data from heterogeneous and distributed sources. Two basic
approaches have been proposed in the literature to provide integrated
access to multiple data sources. In the materialized approach, data are
previously accessed, cleaned, integrated and stored in the data warehouse
and the queries submitted to the integration system are evaluated in this
repository without direct access to the data sources. In the virtual
approach, the queries posed to the integration system are decomposed into
queries addressed directly to the sources. The data obtained from the
sources are integrated and returned to the user. In this work we present a
data integration environment to integrate data distributed on multiple web
data sources which combines features of both approaches supporting the
execution of virtual and materialized queries. Other distinguished feature
of our environment is that we also propose the use of a cache system in
order to answer the most frequently asked queries. All these resources are
put together with the goal of optimizing the overall query response
time. |
|
| Title: |
GLOBAL
QUERY OPTIMIZATION BASED ON MULTISTATE COST MODELS FOR A DYNAMIC
MULTIDATABASE SYSTEM |
| Author(s): |
Qiang Zhu
|
| Abstract: |
Global query optimization in a multidatabase system (MDBS)
is a challenging issue since some local optimization information such as
local cost models may not be available at the global level due to local
autonomy. It becomes even more difficult when dynamic environmental
factors are taken into consideration. In our previous work, a qualitative
approach was suggested to build so-called multistate cost models to
capture the performance behavior of a dynamic multidatabase environment.
It has been shown that a multistate cost model can give a good cost
estimate for a query run in any contention state in the dynamic
environment. In this paper, we present a technique to perform query
optimization based on multistate cost models for a dynamic MDBS. Two
relevant algorithms are proposed. The first one selects a set of
representative system environmental states for generating an execution
plan with multiple versions for a given query at compile time, while the
second one efficiently determines the best version to invoke for the query
at run time. Experiments demonstrate that the proposed technique is quite
promising for performing global query optimization in a dynamic MDBS.
Compared with related work on dynamic query optimization, our approach has
an advantage of avoiding the high overhead for modifying or re-generating
an execution plan for a query based on dynamic run-time information. |
|
| Title: |
A
DATA, COMPUTATION, KNOWLEDGE GRID THE CASE OF THE ARION SYSTEM |
| Author(s): |
Spyros
Lalis, Manolis Vavalis, Kyriakos Kritikos, Antonis
Smardas, Dimitris Plexousakis, Marios Pitikakis,
Catherine Houstis, Vassilis Christophides |
| Abstract: |
The ARION system provides basic e-services of search and
retrieval of objects in scientific collections, such as, datasets,
simulation models and tools necessary for statistical and/or visualization
processing. These collections may represent application software of
scientific areas, they reside in geographically disperse organizations and
constitute the system content. The user may invoke on-line computations of
scientific datasets when the latter are not found into the system. Thus,
ARION provides the basic infrastructure for accessing and deriving
scientific information in an open, distributed and federated system. |
|
| Title: |
SCANNING
A LARGE DATABASE ONCE TO MINE ASSOCIATION RULES |
| Author(s): |
Frank
Wang
|
| Abstract: |
Typically 95% of the data in the transaction databases are
zero. When it comes to sparse, the performance quickly degrades due to the
heavy I/O overheads in sorting and merging intermediate results. In this
work, we first introduce a list representation in main memory for storing
and computing datasets. The sparse transaction dataset is compressed as
the empty cells are removed Accordingly we propose a ScanOnce algorithm
for association rule mining on the platform of list representation, which
just needs to scan the transaction database once to generate all the
possible rules. In contrast, the well-known Apriori algorithm requires
repeated scans of the databases, thereby resulting in heavy I/O accesses
particularly when considering large candidate datasets. Attributing to its
integrity in data structure, the complete itemset counter tree can be
stored in a (one-dimensional) vector without any missing gap, whose
direct-addressing capability ensures fast access to any counter. In our
opinion, this new algorithm using list representation economizes storage
space and accesses. The experiments show that this ScanOnce algorithm
beats classic Apriori algorithm for large problem sizes, by factors
ranging from 2 to more than 6. |
|
| Title: |
INTEGRATION
OF DISTRIBUTED SOFTWARE PROCESS MODELS |
| Author(s): |
Mohamed Ahmed-nacer,
Nabila Lardjane |
| Abstract: |
Developing software-in-the-large involves many developers,
with experts in various aspects of software development and in various
aspects of the application area. This paper presents an approach to
integrate software process models in a distributed context. It is based on
the fusion of process fragments (components) defined with the UML notation
(Unified Modelling Language). The integration methodology presented allows
unifying the various fragments both at the static level as well as at the
dynamic level (behavioural). We consider various possible semantic
conflicts; formal definitions of the inter-fragments properties are
formulated and solutions for these conflicts are proposed. This
integration approach provides multiple solutions for the integration
conflicts and gives the possibility to improve and design new software
process models by a merging of reusable process fragments. |
|
| Title: |
A
BITEMPORAL STORAGE STRUCTURE FOR A CORPORATE DATA WAREHOUSE |
| Author(s): |
Alberto Abelló,
Carme Martín |
| Abstract: |
This paper brings together two research areas, i.e. Data
Warehouses and Temporal Databases, involving representation of time.
Looking at temporal aspects within a data warehouse, more similarities
than differences between temporal databases and data warehouses have been
found. The first closeness between these areas consists in the possibility
of a data warehouse redefinition in terms of a bitemporal database. A
bitemporal storage mechanism is proposed along this paper. In order to
meet this goal, a temporal study of data sources is developed. Moreover,
we will show how Object-Oriented temporal data models contribute to add
the integration and subject-orientation that is required by a data
warehouse. |
|
| Title: |
TOWARD
A DOCUMENTARY MEMORY |
| Author(s): |
Christine JULIEN,
Max CHEVALIER, Kais Khrouf |
| Abstract: |
An organisation must enable to share knowledge and
information within its employees to optimise their tasks. However, the
volume of information contained in documents represents a major importance
for these companies. Indeed, companies may be fully reactive to any new
information and must follow the fast evolution of spread information. So,
a documentary memory, which store this information and allow end-user to
access or analyse it, constitutes a necessity for every enterprise. We
propose, in this paper, the architecture of such a system, based on a
document warehouse, allowing the storage of relevant documents and their
exploitation via the techniques of information retrieval, factual data
interrogation and information multidimensional analysis. |
|
| Title: |
DISTRIBUTED
OVERLOAD CONTROL FOR REAL-TIME REPLICATED DATABASE SYSTEMS |
| Author(s): |
Samia Saad-Bouzefrane,
C. Kaiser |
| Abstract: |
In order to meet their temporal constraints, current
applications such as Web-based services and electronic commerce use the
technique of data replication. To take the replication benefit, we need to
develop con-currency control mechanisms with high performance even when
the distributed system is overloaded. In this paper, we present a protocol
that uses a new notion called importance value which is associated with
each real-time transaction. Under conditions of overload, this value is
used to select the most important transactions with respect to the
application transactions in order to pursue their execution ; the other
transactions are aborted. Our protocol RCCOS (Replica Concurrency-Control
for Overloaded Systems) augments the protocol MIR-ROR, a concurrency
control protocol designed for firm-deadline applications operating on
replicated real-time databases in order to manage efficiently transactions
when the distributed system is overloaded. A platform has been developped
to measure the number of transactions that meet their deadlines when the
processor load of each site is controlled. |
|
| Title: |
INCREMENTAL
HORIZONTAL FRAGMENTATION OF DATABASE CLASS OBJECTS |
| Author(s): |
Christie
Ezeife, Pinakpani Dey |
| Abstract: |
Horizontal fragments of a class in an object-oriented
database system contain subsets of the class extent or instance objects.
These fragments are created with a set of system input data consisting of
the application queries, their access frequencies, the object database
schema with components - class inheritance and class composition
hierarchies as well as instance objects of classes. When these system
input to the fragmentation process change enough to affect system
performance, a re-fragmentation is usually done from scratch. This paper
proposes an incremental re-fragmentation method that uses mostly the
updated part of input data and previous fragments to define new fragments
more quickly, saving system resources and making the data at distributed
sites more available for network and web access. |
|
| Title: |
GEONIS
- FRAMEWORK FOR GIS INTEROPERABILITY |
| Author(s): |
Leonid Stoimenov,
Slobodanka Djordjevic-Kajan |
| Abstract: |
This paper presents research in Geographic Information
Systems interoperability. Also, paper describes our work in development,
introduces interoperability framework called GeoNis, which uses proposed
technologies to perform integration task between GIS applications and
legacy data sources over the Internet. Our approach provides integration
of distributed GIS data sources and legacy information systems in local
community environment. |
|
| Title: |
BUSINESS
CHANGE IMPACTS ON SYSTEM INTEGRATION |
| Author(s): |
Fabio Rollo,
Gabriele Venturi, Gerardo Canfora |
| Abstract: |
Large organizations have disparate legacy systems,
applications, processes, and data sources, which interact by means of
various kinds of interconnections. Merging of companies can increase the
complexity of system integration, with the need to integrate applications
like Enterprise Resource Planning and Customer Relationship Management.
Even if sometimes these applications provide a kind of access to their
underlying data and business logic, Enterprise Application Integration
(EAI) is still a challenge. In this paper we analyse the needs that drive
EAI with the aim of identifying the features that EAI platforms must
exhibit to enable companies to compete in the new business scenarios. We
discuss the limitations of current EAI platforms and their evaluation
methods, mainly economies of scale and economies of scope, and argue that
a shift is needed towards the economies of learning model. Finally, we
outline an EAI architecture that addresses current limitations enabling
economies of learning. |
|
| Title: |
TECHNICAL
USE QUALITY IN A UNIVERSITY ENTERPRISE RESOURCE PLANNING SYSTEM:
PERCEPTIONS OF RESPONSE TIME AND ITS STRATEGIC IMPORTANCE |
| Author(s): |
Michelle Morley
|
| Abstract: |
Enterprise Resource Planning Systems (ERPs) are large,
complex enterprise-wide information system that offer benefits of
integration and data-richness to organisations. This paper explores the
quality issue of response times, and the impact of poor response times on
the ability of the organisation studied to achieve their strategy. The
PeopleSoft ERP was implemented within the International Centre (for
international student recruitment and support) at an Australian
University, as part of a University-wide implementation. To achieve the
goal of increased international student enrolments, fast turnaround times
on student applications are critical. The ERP offers poor response times
and this makes it difficult for the International Centre to achieve high
conversion rates (from applications to enrolments) and hence reduces the
perceived value, or ‘business quality’ (Salmela 1997), of the system to
the organisation. The paper uses a quality model developed from Eriksson
and Toern’s (1990) SOLE model, Lindroos’ (1997) Use Quality and Salmela’s
(1997) Business Quality model. |
|
| Title: |
INTEGRATING
AUTOMATION DESIGN INFORMATION WITH XML |
| Author(s): |
Seppo Kuikka,
Mika Viinikkala |
| Abstract: |
Due to the number of parties participating in the design
phase of an automation project, various design, engineering and
operational systems are needed. At the moment, the means to transfer
information from one system to another system, so that it can be further
processed or reused, are not efficient. An integration approach in which
XML technologies are utilized for implementing systems integration is
introduced. Data content of systems are defined by XML Schema instances.
XML messages containing automation design information are transformed
using transformation stylesheets employing a generic standard vocabulary.
Loosely coupled, platform independent, data content-oriented integration
is enabled by XML technologies. A case study that proceeds according to
the approach is also described. It consists of both a software prototype
responsible for communication and data content including XML Schema
instances and transformation stylesheets for the systems covered in the
study. It is found that XML technologies seem to be a part of the right
solution. However, some issues related to schema design and
transformations are problematic. If complex systems are integrated, XML
technologies alone are not sufficient. Future developments include a
general purpose web-service solution that is to answer questions that were
not dealt with by this case study. |
|
| Title: |
IMPRECISION
BASED QUERIES OVER MATERIALIZED AND VIRTUAL INTEGRATED VIEWS |
| Author(s): |
Alberto Trombetta,
Danilo Montesi |
| Abstract: |
The Global-As-View approach to data integration has
focused on the (semi-automatic) definition of a global schema starting
from a given set of known information sources. In this paper, we
investigate how to employ concepts and techniques to model imprecision in
defining mappings between the global schema and the source schemas and to
answer queries posed over the global schema. We propose an extended
relational algebra using fuzzy sets for defining SQL-like query mappings.
Such mappings explicitly take into account the similarities between global
and source schemas to discard source data items with low similarity and to
express the relevance of different sources in populating the global
schema. In the case the global schema is not materialized, we propose a
query rewriting technique for expressing over the sources the queries
posed over the global schema |
|
| Title: |
THE
HAMLET DILEMMA ON EXTERNAL DATA IN DATA WAREHOUSES |
| Author(s): |
Mattias Strand,
Marcus Olsson |
| Abstract: |
Data warehouses are currently given a lot of attention;
both by academics and practitioners, and the amount of literature
describing different aspects of data warehousing is ever-increasing. Much
of this literature is covering the characteristics and the origin of the
data in the data warehouse and the importance of external data is often
pinpointed. Still, the descriptions of external data are on a general
level and the extent of external data usage is not given much attention.
Therefore, in this paper, we describe the results of an interview study,
partly aimed at outlining the current usage of external data in data
warehouses. The study was directed towards Swedish data warehouse
developers and the results shows that the usage of external data in data
warehouses is not as frequent as expected. Only 58 % of the respondents
had been working in projects that had an objective of integrating external
data. Reasons given for rather low usage were problems on assuring the
quality of the external data and lack of data warehouse maturity amongst
the user organizations. |
|
| Title: |
PERFORMANCE
IMPROVEMENT OF DISTRIBUTED DATABASE MANAGEMENT SYSTEMS |
| Author(s): |
Josep
Maria Muixi, August Climent |
| Abstract: |
Distributed databases offer a complete range of desirable
features: availability, reliability, and responsiveness. However, all of
these benefits are at the expense of some extra management; main issues
considered in literature as the base of a tuned distributed database
system could be data replication and synchronization, concurrency access,
distributed query optimization or performance improvement. Work presented
here tries to provide some clues to the last point considering an issue
which has not been taken enough into account under our humble opinion:
load balancing of these distributed systems. It is tried to be shown how
the right load balancing policy influences the performance of a
distributed database management system, and more concretely a
shared-nothing one. |
|
| Title: |
EMPIRICAL
VALIDATION OF METRICS FOR UML STATECHART DIAGRAMS |
| Author(s): |
David Miranda,
Marcela Genero, Mario Piattini |
| Abstract: |
It is widely recognised that the quality of Object
Oriented Software Systems (OOSS) must be assessed from the early stages of
their development. OO Conceptual models are key artifacts produced at
these early phases, which cover not only static aspects but also dynamic
aspects. Therefore, focusing on quality aspects of conceptual models could
contribute to produce better quality OOSS. While quality aspects of
structural diagrams, such as class diagrams, have being widely researched,
the quality of behavioural diagrams such as statechart diagrams have been
neglected. This fact leaded us to define a set of metrics for measuring
their structural complexity. In order to gather empirical evidence that
the structural complexity of statechart diagrams are closed with their
understandability we carried out a controlled experiment in a previous
work. The aim of this paper is to present a replication of that
experiment. The findings obtained in the replication corroborate the
results of the first experiment in the sense that at some extent, the
number of transitions, the number of states and the number of activities
influence statechart diagrams understandability. |
|
| Title: |
A
SOLUTION FOR CONTEXTUAL INTEGRATION BASED ON THE CALCULATION OF A SEMANTIC
DISTANCE |
| Author(s): |
Fabrice JOUANOT,
Kokou Yétongnon, Nadine Cullot |
| Abstract: |
To achieve the interoperation of heterogeneous data
sources with respect to their context and rich semantics keeps yet a real
challenge. Users need to integrate useful information and query coupled
data sources in a transparent way. We propose a solution to help the
integration of heterogeneous sources according to their context. We
present a model to define contextual information associated to local data
and a mechanism which uses this semantics to compare local contexts and
integrate relevant data. Our contextual integration approach, using a rule
based language, allows us to build virtual objects in a semi-automatic
way. They play roles of transparent interfaces for end-users. |
|
| Title: |
DATA
WAREHOUSE – PROCESS TO DEVELOP |
| Author(s): |
Prasad
N. Sivalanka , Rakesh Agarwal |
| Abstract: |
Building a data warehouse involves complex details of
analysis and design of an enterprise-having wide decision support system.
Dimensional modeling can be used to design effective and usable data
warehouses. The paper highlights the steps in the implementation of data
warehouse in a client project. All the observations and phases mentioned
in this document are with reference to the project carried out for
medium-to-large multi-dimensional databases for a client in a controlled
test environment. The recommendations, conclusions and observations made
in this document may not be generalized for all cases unless verified and
tested. |
|
| Title: |
CREATING
THE DOCSOUTH PUBLISHER |
| Author(s): |
Tony Bull
|
| Abstract: |
In this Case Study, a Systems Integration problem is
solved using Object-Oriented Perl, XML/XSLT, and Java. Over the last two
years, the world-renowned Digitization Project ‘Documenting the American
South’ has been slowly converting its SGML-based Legacy system to an
XML-centric system. As of September 2002, the “DocSouth Publisher” has
been the latest change in realizing the new XML environment. |
|
| Title: |
A
COMPARISON OF DATABASE SYSTEMS FOR STORING XML DOCUMENTS |
| Author(s): |
Roger Davies,
Miguel Mira da Silva, Rui Cerveira Nunes |
| Abstract: |
As the need to store large quantities of increasingly
complex XML documents augments, the requirements for database products
that claim to support XML also increases. For example, it is no longer
acceptable to store XML documents without using indices for efficient
retrieval of large collections. In this paper we analyse the current
versions of products representing the three main approaches to XML
storage: native XML databases, XML support by relational databases, and
object-oriented databases with XML support. Several products are analysed
and compared, including performance tests. Our main conclusion is that the
market urgently needs a standard query language and API, analogous to SQL
and ODBC, which were probably the main drivers for the success of
relational databases. |
|
| Title: |
AUTOMATED
DATA MAPPING FOR CROSS ENTERPRISE DATA INTEGRATION |
| Author(s): |
Stefan Böttcher,
Sven Groppe |
| Abstract: |
Currently, there are multiple different classifications
for product descriptions used in enterprise-internal applications and
cross-enterprise applications, e.g. E-procurement systems. A key problem
is to run applications developed for one catalogue on product descriptions
that are stored in a different classification. A common solution is that a
catalogue specialist manually maps different classifications onto each
other. Our approach avoids unnecessary manual work for mapping and
automatically generates mappings between different classifications
wherever possible. This allows us to run E-procurement applications on
different catalogues with a fairly reduced manual work needed for mapping,
what we consider to be an important step towards enterprise application
integration. |
|
| Title: |
XML-BASED
OLAP QUERY PROCESSING IN A FEDERATED DATA WAREHOUSES |
| Author(s): |
Wolfgang Essmayr,
Edgar Weippl, Johannes Huber, Oscar Mangisengi |
| Abstract: |
Today, XML is the format of choice to implement
interoperability between systems. This paper addresses the XML-based query
processing for heterogeneous OLAP data warehouses in a federated
architecture. In our approach, XML, as an intermediary representation, can
be used as a basis for federated queries and queries for local OLAP data
warehouses, whereas XML DTD can be used for query language definition and
validation of a XML federated query. |
|
| Title: |
THE
ENHANCED GREEDY INTERCHANGE ALGORITHM FOR THE SELECTION OF MATERIALIZED
VIEWS UNDER A MAINTENANCE COST CONSTRAINT IN DATA WAREHOUSES |
| Author(s): |
Omar Karam,
Osman Ibrahim, Rasha Ismail, Mohamed El-Sharkawy |
| Abstract: |
A Data Warehouse is a central repository of integrated
information available for the purpose of efficient decision support or
OLAP queries. One of the important decisions when designing a data
warehouse is the selection of views to materialize and maintain in a data
warehouse. The goal is to select an appropriate set of materialized views
so as to minimize the total query response time and the cost of
maintaining the selected views under the constraint of a given total view
maintenance time. In this paper, the maintenance cost is incorporated to
the Greedy Interchange Algorithm (GIA). The performance and behavior of
the Greedy Algorithm considering the maintenance costs (GAm) and the
proposed Greedy Interchange Algorithm considering maintenance cost (GIAm)
are examined through experimentation. The GIAm improves the results over
the GAm by 56.5%, 60.6% and 80% for different maintenance time constraints
100%, 75% and 40% of total maximum maintenance time. An enhancement to the
GIAm is proposed, the enhancement introduced depends on selecting a subset
of views to which the GIA is applied rather than all the views of a view
graph. This selection is based upon views dependencies and result in
substantial run time. |
|
| Title: |
RANKING
AND SELECTING COMPONENTS TO BUILD SYSTEMS |
| Author(s): |
Alberto Sillitti,
Paolo Predonzani, Giampiero Granatella, Tullio Vernazza,
Giancarlo Succi |
| Abstract: |
Component-Based Software Engineering (CBSE) allows
developers to build systems using existing components. Developers need to
find the best set of components that implements most of required features.
Retrieving components manually can be very complicated and time expensive.
Tools that partially automate this task help developers to build better
systems with less effort. This paper proposes a methodology for ranking
and selecting components to build an entire system instead of retrieving
just a single component. This methodology was developed in the European
project CLARiFi (CLear And Reliable Information For Integration). |
|
| Title: |
A
CASE STUDY FOR A QUERY-BASED WAREHOUSING TOOL |
| Author(s): |
Rami Rifaieh,
Nabila Aicha Benharkat |
| Abstract: |
Data warehousing is an essential element of decision
support. In order to supply a decisional database, meta-data is needed to
enable the communication between various function areas of the warehouse
and, an ETL tool (Extraction, Transformation, and Load) is needed to
define the warehousing process. The developers use a mapping guideline to
specify the ETL tool with the mapping expression of each attribute. In
this paper, we will define a model covering different types of mapping
expressions. We will use this model to create an active ETL tool. In our
approach, we use queries to achieve the warehousing process. SQL queries
will be used to represent the mapping between the source and the target
data. Thus, we allow DBMS to play an expanded role as a data
transformation engine as well as a data store. This approach enables a
complete interaction between mapping meta-data and the warehousing tool.
In addition, this paper investigates the efficiency of a Query-based data
warehousing tool. It describes a query generator for reusable and more
efficient data warehouse (DW) processing. Besides exposing the advantages
of this approach, this paper shows a case study based on real scale
commercial data to verify our tool features. |
|
| Title: |
EXTENDING
TREE AUTOMATA TO MODEL XML VALIDATION UNDER ELEMENT AND ATTRIBUTE
CONSTRAINTS |
| Author(s): |
D. Laurent,
D. Duarte, B. Bouchou, Mírian Halfeld Ferrari Alves
|
| Abstract: |
Algorithms for validation play a crucial role in the use
of XML as the standard for interchanging data among heterogeneous
databases on the Web. Although much effort has been made for formalizing
the treatment of elements, attributes have been neglected. This paper
presents a validation model for XML documents that takes into account the
element and attribute constraints imposed by a given DTD. Our main
contribution is the introduction of a new formalism to deal with both
kinds of constraints. We deem that our formalism has interesting
characteristics: it allows dealing with finite trees with attributes and
elements, it is simple, since it is just an extension of regular tree
automata and it allows the construction of a deterministic automaton
having the same expression power as that of a DTD. Moreover, our formalism
can be implemented easily, giving rise to an efficient validation
method. |
|
| Title: |
AN
ARCHITECTURAL FRAMEWORK FOR WEB APPLICATIONS |
| Author(s): |
|
