A tool for model-checking Markov chains

Markov chains are widely used in the context of the performance and reliability modeling of various systems. Model checking of such chains with respect to a given (branching) temporal logic formula has been proposed for both discrete [34, 10] and continuous time settings [7, 12]. In this paper, we describe a prototype model checker for discrete and continuous-time Markov chains, the Erlangen-Twente Markov Chain Checker EÎMC2, where properties are expressed in appropriate extensions of CTL. We illustrate the general benefits of this approach and discuss the structure of the tool. Furthermore, we report on successful applications of the tool to some examples, highlighting lessons learned during the development and application of EÎMC2

RFID Technology in Intelligent Tracking Systems in Construction Waste Logistics Using Optimisation Techniques

Construction waste disposal is an urgent issue for protecting our environment. This paper proposes a waste management system and illustrates the work process using plasterboard waste as an example, which creates a hazardous gas when land filled with household waste, and for which the recycling rate is less than 10% in the UK. The proposed system integrates RFID technology, Rule-Based Reasoning, Ant Colony optimization and knowledge technology for auditing and tracking plasterboard waste, guiding the operation staff, arranging vehicles, schedule planning, and also provides evidence to verify its disposal. It h relies on RFID equipment for collecting logistical data and uses digital imaging equipment to give further evidence; the reasoning core in the third layer is responsible for generating schedules and route plans and guidance, and the last layer delivers the result to inform users. The paper firstly introduces the current plasterboard disposal situation and addresses the logistical problem that is now the main barrier to a higher recycling rate, followed by discussion of the proposed system in terms of both system level structure and process structure. And finally, an example scenario will be given to illustrate the system’s utilization

Extended Abstracts: PMCCS3: Third International Workshop on Performability Modeling of Computer and Communication Systems

Coordinated Science Laboratory was formerly known as Control Systems LaboratoryThe pages of the front matter that are missing from the PDF were blank

Avaliação do desempenho de redes PROFIBUS-DP suportada em técnicas de injecção de faltas

Tese de doutoramento. Engenharia Electrotécnica e de Computadores. Faculdade de Engenharia. Universidade do Porto. 200

A methodology for automated service level agreement compliance prediction

PhD ThesisService Level Agreement (SLA) specification languages express monitorable contracts between service providers and consumers. It is of interest to determine if predictive models can be derived for SLAs expressed in such languages, if possible in a fashion that is as automated as possible. Assuming that the service developer or user uses some SLA specification languages during the service development or deployment process,the Service level agreement Compliance Prediction(SlaCP) methodology is proposed as a general engineering methodology for predicting SLA compliance.This methodology helps contractual parties to assess the probability of SLA compliance,as automatically as is feasible,by mapping an existing SLA on a stochastic model of the service and using existing numerical solution algorithms or discrete event simulation to solve the model.The SlaCP methodology is generic, but the methodology is mostly described,in this thesis,assuming the use of the Web Service Level Agreement(WSLA)and the Stochastic Discrete Event Systems (SDES)formalism.The approach taken in this methodology is firstly to associate formal semantics with WSLA elements in order to be understood mathematically precise.Then,a five-step mapping process between the source and the target formalisms is conducted.These steps include:mapping into model primitives,reward metrics,expressions for functions of the semetrics,the time at which the prediction occurs,and the ultimate probability of SLA compliance.The proposed methodology is implemented in a software tool that automates most of its steps using Mobius and SPNP.The methodology is evaluated using a case study which shows the methodology’s feasibility and limitations in both theoretical and practical terms.Tishreen University, Ministry of Higher Education in Syri

Avaliação da confiança no funcionamento de redes de campo : contribuição no domínio dos sistemas industriais de controlo

Tese de Doutoramento. Engenharia electrotécnica e de Computadores. Faculdade de Engenharia. Universidade do Porto. 200