Web services dramatically increase the reach of ebusiness. A homogeneous model that spans internal as well as external resources enables uniform solutions to complex business problems. Yet, the complexity of webservice-based systems increases exponentially with their scope. Separation of crosscutting concerns and active management of aspects are fundamental in web-servicebased solutions.In this paper, we first introduce web services and the concept of business interaction concerns. We then propose a process-oriented approach to the modelling of aspects deriving from crosscutting business concerns. We focus on the dynamic nature of web-service-based solutions, and the need for adaptive management of aspects. In particular, we propose a technique for the dynamic distribution of aspects across multiple webservice components. The technique is based on explicit definition of process roles.The proposed approach has been used to build experimental solutions involving dynamic reconfiguration of web-service system. We present an application example in the context of supply-chain integration that was prototyped using the DySCo platform (Dynamic e-Service Composer).
Standard Form 298 Prescribed by ANSI Std. 239-18 298-102 REPORT DOCUMENTATION PAGE Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. (
General aviation (GA) fatal accident records of airport transport pilots (ATPs) were compared to those of private pilots (PVTs). ATPs are safer GA pilots than the PVTs.They have comparable exposure in GA airplanes and account for 7.5% of all certified to fly, but only 3 4 5 % of the fatal accidents. ATPs are less often involved in pilot-induced accidents. Nearly 50% of ATP pilot-induced accidents occur during aerobatics. Often these risky aerial operations are performed below a safe altitude and are associated with the descriptors 'careless' and 'reckless'. The ATP aerobaticsrelated fatality is likely to occur in a multi-wing aeroplane with which he has little experience. The ATP aerobatics-related accident is likely to be of the spin, stall, or controlled flight into terrain variety, and to occur in summer or early autumn. 'The study used data from 13 680 general aviation (GA) accidents occurring between 1973 and 1983, inclusive. This represents approximately 30% of the 45 627 accidents that occurred during that period in GA aircraft.The accidents selected for study met the following criteria:(1) The GA flight was flown for personal (non-commercial) reasons.(2) The aircraft involved was a powered fixed-wing aeroplane.(3) The accident was a single-aircraft accident.(4) The aeroplane had not more than two pilots on board.
Abstract. Mainly on the wake of the Web Service initiative, electronic services are emerging as a reference model for business information technology systems. Individual applications retain core functions and technology base, but integration becomes crucial. A business service derives from the coordination of different business capabilities. The related electronic service derives from the integration of the different applications sustaining such capabilities. The effective realisation of an electronic service requires explicit modelling and active management of the relations between business capabilities and technical infrastructure. In this paper, we propose the notion of Electronic Service Management System (ESMS) as a framework for modelling and implementing electronic services. The notion of ESMS is substantiated by a workflow-oriented architecture, which we mainly derive from the experience of HP Service Composer and the DySCo (Dynamic Service Composer) research prototype. The architecture is defined in accordance with the OMGs Model-driven Architecture (MDA) principles.
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