E-Service Architecture Selection Based on Multi-criteria Optimization

The selection of the most acceptable architecture of e-services system is very important issue. One and the same e-service can be designed using different alternative architectures. Each system has different execution indices that are very important for the e-services clients and providers. This article shows solutions for compromise or the most acceptable selection of the architecture of e-services system using more than one criterion at the same time. The solution is based on the theory of graphs and usage of multi-criteria methods and their basics is following: E-service algorithm is described with an algorithm graph. Using segmentation of algorithm graph web service graphs are obtained that are assessed with characteristic numerical values of system architecture. Several characteristics of system architecture are: Reusability, Costs of Production and Time of Execution. The task of multi-criteria optimization of web service graphs is defined when as result the compromise or the Pareto set of web service graphs is evaluated. The most acceptable solution of system architecture is selected from Pareto set by using additional information. The usage of offered method is demonstrated with help of practical example. 1 Architecture of E-Services System Currently achievements of information technologies create not only possibilities but also a necessity for simple and efficient means how to ensure information receipt, processing, saving and exchange. Internet has become one of main means for furnishing and receiving information and services. In such context there occurs necessity to talk about electronic services or eservices, their development, structure and architecture. E-service traditionally is realized as a set of actions of information systems. It contains functional possibilities of several systems as a result giving material and nonmaterial wealth for society (physical and legal persons). Electronic services contain four levels of electronization: 1 – information about the service is available on the internet; 2 – it is possible to download forms that are necessary for receiving the service; 3 – it is possible to hand in data electronically for receiving the service; and 4 – complete the electronization of service. Providers of the service and clients must ensure the electronization of service. Further in this article we will understand that e-service is a 346 E. Zeiris and M. Ziema service that is electronizated according to electronization levels for usage on the internet. For electronic services of levels 3 and 4, it is useful to look at architecture of E-services’ systems. Let’s view common architecture of e-services system [1, 2]. In te gr at io n H TM L