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Singer R.,FH Joanneum University of Applied Sciences
ACM International Conference Proceeding Series

In this paper, we propose to rethink the dominant logic of how to model and execute business processes. We think that an actor or agent, respectively Subject-oriented, based approach supports in a much better way the fundamental nature of business processes. We present a proposal for a compiler architecture to model and execute business processes without the need for a dedicated business process management system. Instead, we propose to use a general purpose virtual machine to host the processes. We also propose a concrete path for realization based on the Erlang/Elixir solution system. We also discuss a method to define business processes as a set of formal natural language sentences. Source

Killian M.,Vienna University of Technology | Mayer B.,FH Joanneum University of Applied Sciences | Kozek M.,Vienna University of Technology
Energy and Buildings

Abstract In this paper an effective modeling approach for building heating dynamics is presented. The proposed model is a so-called fuzzy black-box model. This data-based model is able to reproduce the nonlinear dynamic behavior of a complex office building split into different zones. The fuzzy black-box model is based on local linear models (LLM), for which a 2-dimensional partition space is obtained. In the proposed work data pre-processing is one of the most important tasks and thus extensively explained. This includes the selection of suitable input and output data and selection of appropriate model orders. Furthermore, it is presented that even with a small amount of data good models can be achieved. The output of this LLM algorithm is an autoregressive model with exogenous input (ARX). The resulting model is specifically tailored for model-based control design. The uniqueness of the presented work lies not only in the low-order of the building model, but also in the way of retrieving a model in the most effective and time-saving way. © 2015 Elsevier B.V. All rights reserved. Source

Danzer R.,University of Leoben | Lengauer M.,FH Joanneum University of Applied Sciences
Engineering Failure Analysis

For hot rolling, tools are nowadays made of cemented carbides. In service, these rolls suffer from wear and thermal fatigue. Due to the properties of ceramics, their use could cause improvements in tool behaviour. In field tests - when rolling materials with high deformation resistance - cracks developed in the silicon nitride rolls, which grew for a long time period before large parts of the rolls broke apart. In more moderate rolling conditions the rolls operated safely. A FE model is used to analyse the in-service behaviour of cracks in the silicon nitride rolls. For the observed crack path the stress intensity factor of the cracks is determined using the weight function method. It increases up to a crack depth of around 0.35 mm and then decreases again with increasing crack depth. This explains the observed pop-in-type growth of cracks after an overload. Depending on the rolled materials, the popped in cracks have a length of up to 1.2 mm. The further growth of the cracks to a length of several millimetres, which is caused by a fatigue growth mechanism, needs several thousand additional revolutions. © 2009 Elsevier Ltd. All rights reserved. Source

Posch A.,University of Graz | Brudermann T.,University of Graz | Braschel N.,University of Graz | Gabriel M.,FH Joanneum University of Applied Sciences
Journal of Cleaner Production

Increasing energy prices and market volatilities force energy intensive industries to implement energy management systems in order to ensure competitiveness. In this paper, we focus on the strategic level of energy management, specifically, on the analysis of the internal and external conditions that form the basis for strategic development. For this, we selected the case of the Austrian paper and pulp industry. We applied a hybrid method by combining an analysis of strengths, weaknesses, opportunities and threats with an analytic hierarchy process which was based on a survey of expert opinion. The results show that cost-related factors predominate. According to our analysis, the four most important factors are all directly linked to energy costs, energy efficiency, and the energy market. Experts pay little attention to environmental issues or to energy market volatilities. Apart from that, the combination of an analysis of strengths, weaknesses, opportunities and threats with an analytic hierarchy process promises to be a valuable tool for strategic energy management. This is especially true for energy intensive companies and/or sectors, since it enables decision makers to take strategic decisions based on a systematic understanding of the main issues. © 2014 Elsevier Ltd. Source

Singer R.,FH Joanneum University of Applied Sciences
ACM International Conference Proceeding Series

This study aims to focus on the examination of business process management (BPM) maturity levels within smalland medium-sized enterprises (SME) and their relationship with the company's economic success. A further aim is to evaluate the understanding of the term BPM in the field. The findings result from a mixed-method approach combining qualitative and quantitative empirical methods. The qualitative study collected data carrying out 20 interviews in 11 enterprises. On the basis of these findings, a webquestionnaire for the quantitative study was developed. In order to evaluate the maturity levels, an adapted version of Hammers Process and Enterprise Maturity Model (PEMM) had to be developed. Data collected within quantitative research suggests higher maturity levels in comparison with data collected within qualitative research. A weak statistical connection between maturity level and economic success can be found. However, the data suggest that there is a lack in common understanding of the term business process management in praxis. Due to the reactivity of qualitative interviews a different sample may provide other findings. Whilst accessibility is a considerable advantage of web-surveys, a disadvantage of web-surveys is the lack of regulation of the sample. Hence, the findings of this study are not statistically representative for all SMEs. Copyright 2015 ACM. Source

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