Event-based systems are developed and used to integrate components in loosely coupled systems. Research and product development focused so far on efficiency issues but neglected methodological support to build such systems. In this article, the modular design and implementation of an event system is presented which supports scopes and event mappings, two new and powerful structuring methods tha...

This paper presents a new scheme in the publish/subscribe paradigm. Index-based publish/subscribe is designed to overcome the problems of administration and unwanted message delivery in topic-based systems, whilst not requiring the subscription state network load normally required by a content-based approach. The index-based approach is particularly effective while waiting for unpredictable eve...

Large-scale event systems are becoming increasingly popular in a variety of domains. Event pattern evaluation plays a key role in monitoring applications in these domains. Existing work on pattern evaluation, however, assumes that the occurrence time of each event is known precisely and the events from various sources can be merged into a single stream with a total or partial order. We observe ...

Large-scale event systems are becoming increasingly popular in a variety of domains. Event pattern evaluation plays a key role in monitoring applications in these domains. Existing work on pattern evaluation, however, assumes that the occurrence time of each event is known precisely and the events from various sources can be merged into a single stream with a total or partial order. We observe ...

Existing commercial and research event-based middleware are limited in their ability to evolve in order to support the requirements of novel applications. As a result, new infrastructures are being proposed to attend to widening scope and changing demands. In this paper, we define the concept of versatility generally and survey existing approaches that can be used to develop and preserve versat...

We propose a Spatio-Temporal Extended Event Language (STEEL) for representing and reasoning about events that are described in outbreak reports. This language is an extension of the Event Calculus based on mereotopological relationships and structured conglomeration of events, in which time is replaced with spatiotemporal location. It allows representing and building aggregates of events accord...

Human lives and organizations are increasingly dependent on the correct functioning of computer systems and their failure might cause personal as well as economic damage. There are two non-exclusive approaches to minimize the risk of such hazards: (a) faultintolerance tries to eliminate design and manufacturing faults for hardware and software before a system is put into service. (b) fault-tole...

Motion is an important cue in videos that captures the dynamics of moving objects. It helps in effective analysis of various event related tasks such as human action recognition, anomaly detection, tracking, crowd behavior analysis, traffic monitoring, etc. Generally, accurate motion information is computed using various optical flow estimation techniques. On the other hand, coarse motion infor...

The paper demonstrates that a wide variety of event-based modeling approaches are based on special cases of the same general event concept, and that the general event concept can be used to unify the otherwise unrelated fields of information modeling and process modeling. A set of event-based modeling approaches are analyzed and the results are used to formulate a general event concept that can...

This chapter examines techniques for securing various types of event-based systems. The first section discusses typical application requirements. The following section examines specific event dissemination approaches. Applying applicationlevel security to event-based systems is introduced at first, along with an overview of Role-Based Access Control. Application-level security is a perimeter de...