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Schalles C.,Baden Wuerttemberg Cooperative State University | Creagh J.,Cork Institute of Technology | Rebstock M.,FH Darmstadt
International Journal of Software Engineering and Knowledge Engineering | Year: 2014

Today, developing the conceptual design of information systems has become inconceivable without the support of graphical models. Models are developed using graph-based modeling languages such as UML. This study focuses on the impact of metamodel properties on different usability attributes in the domain of graphical modeling languages. The study is based on a model of hypotheses including a structural causal model developed under consideration of cognitive theories and usability theory. Survey data is collected and the causal hypotheses are assessed using a structure equation modeling approach. The study shows important findings for practical and theoretical issues of how differing modeling languages are inuencing usability attributes on causal stages in the modeling domain. The main focus of this article is to define differences and similarities of how language metaproperties impact usability attributes in model interpretation scenarios.


Mueller C.,University of Economics in Prague | Hofmeister A.,Baden Wuerttemberg Cooperative State University | Breckner M.,Baden Wuerttemberg Cooperative State University
Proceedings of the IEEE International Conference on Software Engineering and Service Sciences, ICSESS | Year: 2014

In this paper a new approach for handling the problem of comparing different complex algorithms is proposed. The main idea behind this research is to set up a framework that can be applied to the most well-known and widely used complex algorithms. A component-based framework, IEOCA (Intelligent Evaluation of Complex Algorithms) written in Java for building and studying complex algorithms like genetic algorithms and ant colony optimization is developed. The evaluation framework provides a standard testing methodology for comparing the accuracy and performance of selected algorithms. © 2014 IEEE.


Voss M.,University of Mannheim | Sauer T.,Baden Wuerttemberg Cooperative State University | Bozkurt H.,University of Mannheim
Proceedings of the 16th International Conference on Engineering and Product Design Education: Design Education and Human Technology Relations, E and PDE 2014 | Year: 2014

This paper presents a study that examines how well-known methods for idea generation can be advantageously combined. It investigates Method 6-3-5, a group technique for six developers who successively refine three initial ideas under tight time constraints (within five minutes per round). In the conducted experiments, this commonly used brainwriting technique was complemented with a set of design heuristics that should help the participants to abstract the problem and should guide them to potential solutions. The study (with N = 88 participants in total) compares first and third year B.Eng. students in a Mechanical Engineering programme with young professionals holding more than one year working experience. For evaluating the solutions that the participants generated, metrics were employed that measured the variety and the quantity of the ideas. The paper also analyses if more experience permits engineers to overcome the 'fixation' to an initial design.


Dubinin D.,Tomsk State University of Control Systems and Radioelectronics | Geringer V.,Baden Wuerttemberg Cooperative State University | Kochegurov A.,Tomsk Polytechnic University | Reif K.,Baden Wuerttemberg Cooperative State University
At-Automatisierungstechnik | Year: 2014

This article outlines a stochastic algorithm for modelling stochastic intensity fields by a two-dimensional Markov renewal process. The selection of the alphabetical structure and grid characteristics based on the grid structure (one form of edge structure/morphology of the field) is determined manually by the operator in advance. The presented algorithm allows the generating of different types of grid structureswith horizontal, vertical and diagonal elements in an 8-adjacency. The algorithm will provide an excellent basis for the designing, analysing, validating, and quality assurance of image processing systems.


Geringer V.,Baden Wuerttemberg Cooperative State University | Dubinin D.,Tomsk State University of Control Systems and Radioelectronics | Kochegurov A.,Tomsk Polytechnic University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2016

The paper presents the results of a quantitative estimation of the edge detection quality using modified Pratt-Yaskorskiy criterion, as well as generalization and adaptation of both approaches based on the generalized quality criterion as part of «CS sF» stochastic simulation software package. The reference images are approximated by the two-dimensional high rise renewal stream offering the stationarity properties with no aftereffects and ordinariness. The efficiency of the proposed metrics is considered for three edging algorithms (Marr-Hildreth, ISEF and Canny) at different levels of the additive normal noise. The estimated errors of the first and second kind are given, which allow referring to the efficiency of the proposed generalized quality criterion. © Springer International Publishing Switzerland 2016.


Dubinin D.,Tomsk State University of Control Systems and Radioelectronics | Geringer V.,Baden Wuerttemberg Cooperative State University | Kochegurov A.,Tomsk Polytechnic University | Reif K.,Baden Wuerttemberg Cooperative State University
IEEE SSCI 2014 - 2014 IEEE Symposium Series on Computational Intelligence - CICA 2014: 2014 IEEE Symposium on Computational Intelligence in Control and Automation, Proceedings | Year: 2015

The essay outlines one particular possibility of efficient evaluating the Performance of edge detector algorithms. Three generally known and published algorithms (Canny, Marr, Shen) were analysed by way of example. The analysis is based on two-dimensional signals created by means of two-dimensional Semi-Markov Model and subsequently provided with an additive Gaussian noise component. Five quality metrics allow an objective comparison of the algorithms. © 2014 IEEE.


Geringer V.,Baden Wuerttemberg Cooperative State University | Dubinin D.,Tomsk State University of Control Systems and Radioelectronics | Kochegurov A.,Tomsk Polytechnic University | Reif K.,Baden Wuerttemberg Cooperative State University
ISSCS 2015 - International Symposium on Signals, Circuits and Systems | Year: 2015

The paper presents the results of the investigation of the I. Boaventura und A. Gonzaga integrated performance evaluation method of edge detection [1-2], obtained using the bundled software of stochastic simulation «CS sF» [3]. The methods and approaches of stochastic simulation were used in the experiments and the reference images were approximated with the two-dimensional renewal stream [4-7]. The performance of the outline drawing detection was evaluated by Boaventura und Gonzaga method for three algorithms of the edge detection («Canny», «Marr-Hildreth» and «ISEF») under different levels of peak signal-to-noise ratio. The results of the investigation are presented as dependences of the estimate probability of the correct edge detection, the type 1 and 2 errors, on S/N ratio. The performance analysis of the above three algorithms for the images, produced on the basis of morphology type «A» and «F», is done based on the performed evaluation. © 2015 IEEE.


Sangwin C.J.,University of Edinburgh | Kocher N.,Baden Wuerttemberg Cooperative State University
Computers and Education | Year: 2016

Assessment is a key component of all educational systems, and automatic online assessment is becoming increasingly common for formative work in mathematics. This paper reports an investigation of the extent to which contemporary automatic assessment software can automatically mark answers to questions from existing high-stakes mathematics examinations. The questions are taken from a corpus of publicly available core mathematics questions designed for high-achieving students aged approximately eighteen at the school-university interface. We focus on the extent to which objective properties of each final answer may be automatically established and the extent to which automatic marking reasoning by equivalence supports assessment of students' methodology. Our results show that transcribing existing paper-based mathematics examinations into an electronic format is now feasible for a significant proportion of the questions as currently assessed. The most significant barrier to using contemporary automatic assessment is the requirement from examiners that students provide evidence that they have used an appropriate method. © 2015 Elsevier Ltd. All rights reserved.


Mueller S.,University of Leipzig | Winkelmann C.,Baden Wuerttemberg Cooperative State University | Krause F.,University of Leipzig | Grunwald M.,University of Leipzig
Experimental Brain Research | Year: 2014

Extensive use of sensorimotor properties has been shown to lead to use-dependent plasticity in the human motor cortex as well as sensory areas. The sensory consequences of these cortical changes, however, remain widely unclear. We were interested whether job-related long-term haptic training is measurable in terms of changes in haptic perception (active touch exploration) in manual physiotherapists (PT). To that end, the haptic thresholds of PT (students and employed) and registered osteopathic manual therapists (OMT; PT with postgraduate specialization) were measured and compared to age- and sex-matched control groups. Additionally, tactile acuity (passive static touch) was assessed using grating domes. PT and OMT had superior mean haptic thresholds compared to the control group, suggesting an increase in sensitivity through use. An age-related decline in haptic perception capacity occurred only in the control group, suggesting that the job-related training of the manual therapist groups may have slowed their age-related decline. Contrary to our expectation, we found significantly poorer mean haptic threshold results in the PT student group than for the controls. No significant differences or changes in tactile acuity were found for any of the groups (students and professional). The present results demonstrate use-dependent plasticity in manual therapists. Furthermore, the results underline the known effect of a superior discrimination ability of haptic as opposed to tactile perception. © 2014 Springer-Verlag.


Mitlacher L.W.,Baden Wuerttemberg Cooperative State University
International Journal of Networking and Virtual Organisations | Year: 2012

Virtual teams and virtual project management teams in particular have become more widespread with the rise and distribution of new technology and the increasing use of the internet. As companies deploy virtual teams to guarantee a seamless work on different projects, the question arises how the performance of virtual teams should be measured and how the performance should be rewarded. Using a strategic human resource management framework, the paper develops several propositions on the design of appraisal and rewards systems for virtual project management teams. The aim of the analysis is to shed light on the question what challenges arise by measuring the performance of teams, how to possibly resolve them, how to design an adequate rewards system for virtual project management teams and what are the consequences for company performance. © 2012 Inderscience Enterprises Ltd.

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