Abstract Before Java Fork-Join framework implementation, the only way to parallelize recursive application in java was done in a naïve way, which consists of creating as many threads as existing tasks. However, javar introduced the cutdepth parameter that consists of limiting the creations of the number of threads, but does not allow benefiting from fine-grain parallelism. The purpose of this article... Before Java Fork-Join framework implementation, the only way to parallelize recursive application in java was done in a naïve way, which consists of creating as many threads as existing tasks. However, javar introduced the cutdepth parameter that consists of limiting the creations of the number of threads, but does not allow benefiting from fine-grain parallelism. The purpose of this article is to design and implement a performing compiler for parallelizing Java application with divideand- conquer algorithm. The compiler includes directives and environment variables. It is built around Java ForkJoin framework, which is directly integrated within Java 1.7 version and imported as archive library in Java 1.6 and 1.5 versions. This compiler tends to make easier and less error-prone the parallelization of recursive applications. Although in Java ForkJoin Framework there are two user-level performance parameters , which are the number of threads and the threshold, our compiler introduces another user-level performance parameter which is the MaxDepth corresponding to the maximum of depth before which parallel execution is enforced and after which sequential execution is enforced. This allows balancing between fine-grain and coarse-grain parallelisms. Experimental results are presented and discussed. Read More Read Less

Abstract This research study aims to investigate the role of Wikipedia in contemporary knowledge production as it is viewed by the various users of such tools in Greece. Academics, scientists, scholars and professionals provide a variety of argumentation on the pros and cons of the role of Wikipedia in contemporary knowledge production some of them rather conflicting to each other. A... This research study aims to investigate the role of Wikipedia in contemporary knowledge production as it is viewed by the various users of such tools in Greece. Academics, scientists, scholars and professionals provide a variety of argumentation on the pros and cons of the role of Wikipedia in contemporary knowledge production some of them rather conflicting to each other. A pre-tested questionnaire was used for data collection. The data were collected at various establishments and a total of about 171 individuals from all walks of life, different backgrounds and age and cultures responded. The study results are clear. Wikipedia is a successful story, regardless of its credibility, despite its authors’ anonymity and often lack a significant and/or particular academic or professional merit, but because it is a good start and a quick and easy source of finding free information that either will be confirmed by other more official sources or that can be used by “casual” info seekers. Many individuals in Greece make use of Wikipedia but no research was done so far as to the perception of its quality. Although this pilot study originated in Greece, E.U. but the authors suspect it is very likely the results apply to many other geographic regions and populations. Read More Read Less

Abstract Complex systems are characterized not only by the diversity of their components, but also by the interconnections and interactions between them. For modeling such systems, we often need more than one formalism and we must concern ourselves with the coexistence of heterogeneous models.This purpose can be achieved by using the multi-modeling. The transformation of such models in a pivot model... Complex systems are characterized not only by the diversity of their components, but also by the interconnections and interactions between them. For modeling such systems, we often need more than one formalism and we must concern ourselves with the coexistence of heterogeneous models.This purpose can be achieved by using the multi-modeling. The transformation of such models in a pivot model is a technique in this context. This paper proposes a translation approach of Petri nets to DEVS “Discrete Event System Specification” models.We present mechanisms which can systematically transform the places and transitions of Petri netsto DEVS models. The coupling of these models generates a DEVS coupled model capable of running on platforms based on DEVS. Read More Read Less

Abstract The aim of this paper is to model the temporal aspects of information systems by proposing a meta-model based on pre-existing representation formalisms. It will thus be possible to access the successive states (evolution) of IS by the notion of time.... The aim of this paper is to model the temporal aspects of information systems by proposing a meta-model based on pre-existing representation formalisms. It will thus be possible to access the successive states (evolution) of IS by the notion of time. Read More Read Less