“Each and every important work of art leaves traces behind in its material technique,” Theodor W. Adorno postulates Aesthetic Theory, as he describes the way a composition is both result own time reacts critically to it belongs to. This quote demonstrates reversal: rather than merely an expression or outcome artist’s idea, itself regarded source for change. The may come affect tools mate...

Nowadays, several organisations provide services on the Internet with similar functionality but different price and pricing schemes. Since these services are used in service compositions, the providers of composed services have to face the challenge of managing the services they use, in order to decrease the cost of the service compositions without compromising their quality. Several techniques...

An important challenge for service-based systems is to be able to select services based on feedback from service consumers and, therefore, to be able to distinguish between good and bad services. However, ratings are normally provided to a service as a whole, without taking into consideration that services are normally formed by a composition of other services. In this paper we propose an appro...

Let N be the set of all positive integers and let A be any ordered subset of N. Recently, Heubach and Mansour enumerated the number of compositions of nwithm parts inA that contain the subword τ exactly r times, where τ ∈ {111, 112, 221, 123}. Our aims are (1) to generalize the above results, i.e., to enumerate the number of compositions of n with m parts in A that contain an `-letter subword, ...

Nowadays Internet is anywhere and users can find all possible information. In this situation, the new challenge is to provide the right information at the right time. As Web services are becoming a de facto way to integrate heterogeneous applications, companies are publishing some of their functionalities using a Web service format. Consequently, users can search for Web services so as to resol...

We prove a result on the frequency of zeros of f ◦ g −Q, where g is a transcendental entire function of finite lower order, and f and Q are meromorphic functions in the plane such that f has finite order and the growth of the target function Q is controlled by that of g. The particular case f = Q is then investigated further.