Search results

1 – 2 of 2
Article
Publication date: 17 August 2015

Tomasz Miksa, Rudolf Mayer and Andreas Rauber

This paper aims to address the issue of long-term stability of services and systems depending on service-oriented architecture that has become a popular architecture in systems…

Abstract

Purpose

This paper aims to address the issue of long-term stability of services and systems depending on service-oriented architecture that has become a popular architecture in systems development and is often implemented using Web services. However, the dependency, especially on externally provided services, can impact the reliability of a system. This is often caused by the loose coupling also implying a less stringent policy for change management and notifications. Therefore, the authors characterise the types of changes that can happen in remote services and propose the concept of resilient web services (RWSs) as an example on how to upgrade existing services to better support the long-term stability of services and systems.

Design/methodology/approach

Having analysed several use cases where systems broke because of external dependencies not correctly maintained, the authors derived requirements for RWSs.

Findings

By means of a prototype implementation and evaluation of this solution in a case study, the feasibility of the approach was verified. Several scenarios of changes in WSs were simulated, correctly identified and responded to.

Originality/value

The authors propose a set of extensions to existing standards such as Web Services Description Language to improve the long-term availability of services in SOAs. A prototype implementation was developed for service monitoring and RWSs.

Details

International Journal of Web Information Systems, vol. 11 no. 3
Type: Research Article
ISSN: 1744-0084

Keywords

Article
Publication date: 11 October 2018

Wojciech Jerzy Miksa and Tomasz Goetzendorf-Grabowski

The purpose of this paper is to investigate the feasibility of solving an integrated flight scheduling, fleet assignment and crew pairing problem for an on-demand service using a…

101

Abstract

Purpose

The purpose of this paper is to investigate the feasibility of solving an integrated flight scheduling, fleet assignment and crew pairing problem for an on-demand service using a small, up to 19-seater, aircraft.

Design/methodology/approach

Evolutionary algorithm is developed to solve the problem. Algorithm design assumes indirect solution representation that allows to evaluate partially feasible solutions only and speed up calculations. Tested algorithm implementation takes advantage of the graphic processing unit.

Findings

Performed tests confirm that the algorithm can successfully solve the defined integrated scheduling problem.

Practical implications

The presented algorithm allows to optimise on-demand transport service operation within minutes.

Social implications

Optimisation of operation cost contributes to better accessibility of transport.

Originality/value

The presented integrated formulation allows to avoid sub optimal solutions that are results of solving sequential sub problems. Indirect representation and evaluation strategy can be applied to speed up calculations in other problems as well.

Details

Aircraft Engineering and Aerospace Technology, vol. 91 no. 3
Type: Research Article
ISSN: 1748-8842

Keywords

1 – 2 of 2