@article{36481, abstract = {{Recent studies highlight early childhood teachers’ mathematics-related competence. Developing this competence should be a main aspect of early childhood teachers’ education. This is, however, not the case in all countries. Consequently, high-quality professional development courses are needed. Based on research results, we developed a competence-oriented continuous professional development course ("EmMa") and examined the effects of "EmMa" by asking: How does "EmMa" affect the development of early childhood teachers’ i) mathematical content knowledge, ii) mathematical pedagogical content knowledge and iii) beliefs towards mathematics in general? To answer these questions, we conducted a pre-test/post-test study including a control group with 99 in-service early childhood teachers. Results show that the course affected teachers’ mathematical pedagogical content knowledge and static orientation towards mathematics positively. From this we conclude that scaling-up "EmMa" might be a suitable approach to bridge the gap between pre-service education with nearly no mathematics and the challenges of early mathematics education.}}, author = {{Bruns, Julia and Eichen, Lars and Gasteiger, Hedwig}}, journal = {{Mathematics Teacher Education and Development (MTED)}}, keywords = {{Beliefs, Competency Based Teacher Education, Control Groups, Early Childhood Education, Faculty Development, Foreign Countries, Inservice Teacher Education, Intervention, Mathematical Aptitude, Mathematics Skills, Pedagogical Content Knowledge, Preschool Teachers, Pretests Posttests, Professional Continuing Education, Statistical Analysis, Teacher Competency Testing}}, number = {{3}}, pages = {{76–93}}, title = {{{Mathematics-related Competence of Early Childhood Teachers Visiting a Continuous Professional Development Course: An Intervention Study}}}, volume = {{19}}, year = {{2017}}, } @article{28355, abstract = {{This article investigates learners’ perceptions on pronunciation learning in study-abroad contexts from a qualitative perspective. While previous research focused mainly on quantitative measurements of pronunciation gains with mixed results, this study takes a more learner-centered approach and examines the impact of socio-psychological factors on learning foreign pronunciation, which appears to be a highly individual and at times conflict-prone process with which sojourners are confronted. The study draws on the cases of five Canadian students who studied abroad at German universities for one or two semesters. The data collection involved a learning history questionnaire; semi-structured interviews pre-, mid-, and post-sojourn; and bi-weekly e-journals. The data was analyzed and interpreted within the framework of narrative analysis. The results show how sojourners’ beliefs about the importance of pronunciation, community participation, identity-related challenges, and obstacles to pronunciation learning influence and help explain individually different learning behaviors and results.}}, author = {{Müller, Mareike}}, issn = {{2215-1931}}, journal = {{Journal of Second Language Pronunciation}}, keywords = {{pronunciation learning, study abroad, qualitative approach, narrative analysis, learner beliefs, socio-psychological learning factors}}, number = {{1}}, pages = {{108--142}}, title = {{{Listening to learners’ voices: Qualitative aspects of pronunciation learning during study abroad}}}, doi = {{10.1075/jslp.2.1.05mul}}, volume = {{2}}, year = {{2016}}, } @inproceedings{20719, author = {{Holzinger, Philipp and Triller, Stefan and Bartel, Alexandre and Bodden, Eric}}, booktitle = {{Proceedings of the 2016 ACM SIGSAC Conference on Computer and Communications Security}}, isbn = {{978-1-4503-4139-4}}, keywords = {{ATTRACT, access control, exploits, java security, security analysis, ITSECWEBSITE}}, pages = {{779--790}}, title = {{{An In-Depth Study of More Than Ten Years of Java Exploitation}}}, doi = {{http://doi.acm.org/10.1145/2976749.2978361}}, year = {{2016}}, } @article{4586, abstract = {{This study examines the loan-pricing behavior of German banks for a large variety of retail and corporate loan products. We find that a bank’s operational efficiency is priced in bank loan rates and alters interest-setting behavior. Specifically, we establish that a higher degree of operational efficiency leads to lower loan markups, which makes prices more competitive and smoothes the setting of interest rates. By employing state-of-the-art stochastic frontier efficiency measures to capture a bank’s operational efficiency, we take a look at the bank customers’ perspective and demonstrate the extent to which bor-rowers benefit from cost-efficient banking. }}, author = {{Schlueter, Tobias and Busch, Ramona and Sievers, Soenke and Hartmann-Wendels, Thomas}}, journal = {{Credit and Capital Markets--Kredit und Kapital}}, keywords = {{interest rate pass-through models, error correction models, bank efficiency, cost efficiency, stochastic frontier analysis}}, number = {{1}}, pages = {{93--125}}, title = {{{Loan Pricing: Do Borrowers Benefit from Cost-Efficient Banking?}}}, doi = {{10.3790/ccm.49.1.93}}, volume = {{49}}, year = {{2016}}, } @article{4690, author = {{Gorbacheva, Elena and Stein, Armin and Schmiedel, Theresa and Müller, Oliver}}, issn = {{18670202}}, journal = {{Business and Information Systems Engineering}}, keywords = {{BPM workforce, Business process management, Competences, Gender diversity, Latent semantic analysis, Skills, Text mining}}, number = {{3}}, pages = {{213----231}}, title = {{{The Role of Gender in Business Process Management Competence Supply}}}, doi = {{10.1007/s12599-016-0428-2}}, year = {{2016}}, } @article{4692, author = {{Müller, Oliver and Schmiedel, Theresa and Gorbacheva, Elena and vom Brocke, Jan}}, issn = {{17517583}}, journal = {{Enterprise Information Systems}}, keywords = {{abilities, business process management, competences, knowledge, latent semantic analysis, professionals, skills, typology}}, number = {{1}}, pages = {{50----80}}, title = {{{Towards a typology of business process management professionals: identifying patterns of competences through latent semantic analysis}}}, doi = {{10.1080/17517575.2014.923514}}, year = {{2016}}, } @inproceedings{9963, abstract = {{Tire-wheel assembly is the only connection between road and vehicle. Contacting directly with road within postcard size of contact area, it is mounted and guided by the suspension system. Therefore kinematics and compliances of suspension system greatly influence the frictional coupling of tire tread elements and road surface asperities by affecting pressure and sliding velocity distribution in the contact zone. This study emphasizes the development of a numerical methodology for frictional rolling contact analysis with focus on interaction of suspension system dynamics and tire-road contact using ADAMS. For this purpose a comprehensive flexible multibody system of the multi-link rear suspension is established, where both flexible and rigid bodies are modeled to allow large displacements with included elastic effects. To meet accuracy requirements for the high frequency applications, such as road excitations, the amplitude- and frequency-dependency of rubber-metal bushings is included. Furthermore the proposed flexible viscoelastic suspension model is enhanced by a Flexible Ring Tire Model (FTire), which describes a 3D tire dynamic response and covers any road excitations by tread submodel connected to road surface model. Concerning the verification and validation procedure numerous experiments are carried out to confirm the validity and the accuracy of both the developed submodels and the entire model. The devised approach makes it possible to investigate the influence of suspension system design on dynamical rolling contact and to evaluate tire tread wear. Therefore it can be a useful tool to predict frictional power distribution within the contact area under more realistic conditions.}}, author = {{Kohl, Sergej and Sextro, Walter and Schulze, Sebastian}}, booktitle = {{The 2nd International Conference on Automotive Innovation and Green Energy Vehicle (AiGEV 2016), Cyberjaya, Malaysia, 2016.}}, keywords = {{Kinematics and compliances, flexible viscoelastic suspension model, frictional rolling contact analysis, frictional power distribution.}}, pages = {{1--12}}, title = {{{Aspects of Flexible Viscoelastic Suspension Modeling for Frictional Rolling Contact Analysis using ADAMS}}}, year = {{2016}}, } @article{34662, author = {{Black, Tobias}}, issn = {{0022-247X}}, journal = {{Journal of Mathematical Analysis and Applications}}, keywords = {{Applied Mathematics, Analysis}}, number = {{1}}, pages = {{436--455}}, publisher = {{Elsevier BV}}, title = {{{Boundedness in a Keller–Segel system with external signal production}}}, doi = {{10.1016/j.jmaa.2016.08.049}}, volume = {{446}}, year = {{2016}}, } @article{34661, author = {{Black, Tobias}}, issn = {{1468-1218}}, journal = {{Nonlinear Analysis: Real World Applications}}, keywords = {{Applied Mathematics, Computational Mathematics, General Economics, Econometrics and Finance, General Engineering, General Medicine, Analysis}}, pages = {{593--609}}, publisher = {{Elsevier BV}}, title = {{{Sublinear signal production in a two-dimensional Keller–Segel–Stokes system}}}, doi = {{10.1016/j.nonrwa.2016.03.008}}, volume = {{31}}, year = {{2016}}, } @article{45936, author = {{Kovács, Balázs and Power Guerra, Christian Andreas}}, issn = {{0749-159X}}, journal = {{Numerical Methods for Partial Differential Equations}}, keywords = {{Applied Mathematics, Computational Mathematics, Numerical Analysis, Analysis}}, number = {{4}}, pages = {{1200--1231}}, publisher = {{Wiley}}, title = {{{Error analysis for full discretizations of quasilinear parabolic problems on evolving surfaces}}}, doi = {{10.1002/num.22047}}, volume = {{32}}, year = {{2016}}, } @article{45939, author = {{Kovács, Balázs and Li, Buyang and Lubich, Christian}}, issn = {{0036-1429}}, journal = {{SIAM Journal on Numerical Analysis}}, keywords = {{Numerical Analysis, Applied Mathematics, Computational Mathematics}}, number = {{6}}, pages = {{3600--3624}}, publisher = {{Society for Industrial & Applied Mathematics (SIAM)}}, title = {{{A-Stable Time Discretizations Preserve Maximal Parabolic Regularity}}}, doi = {{10.1137/15m1040918}}, volume = {{54}}, year = {{2016}}, } @article{37663, author = {{Rösler, Margit and Voit, Michael}}, issn = {{0022-247X}}, journal = {{Journal of Mathematical Analysis and Applications}}, keywords = {{Applied Mathematics, Analysis}}, number = {{1}}, pages = {{701--717}}, publisher = {{Elsevier BV}}, title = {{{A multivariate version of the disk convolution}}}, doi = {{10.1016/j.jmaa.2015.10.062}}, volume = {{435}}, year = {{2016}}, } @article{61024, abstract = {{Background: The evolution of primate sexual swellings and their influence on mating strategies have captivated the interest of biologists for over a century. Across the primate order, variability in the timing of ovulation with respect to females’ sexual swelling patterns differs greatly. Since sexual swellings typically function as signals of female fecundity, the temporal relation between ovulation and sexual swellings can impact the ability of males to pinpoint ovulation and thereby affect male mating strategies. Here, we used endocrine parameters to detect ovulation and examined the temporal relation between the maximum swelling phase (MSP) and ovulation in wild female bonobos (Pan paniscus). Data were collected at the Luikotale field site, Democratic Republic of Congo, spanning 36 months. Observational data from 13 females were used to characterise female swelling cycles (N = 70). Furthermore, we measured urinary oestrone and pregnanediol using liquid chromatography–tandem mass spectrometry, and used pregnanediol to determine the timing of ovulation in 34 cycles (N = 9 females). Results: We found that the duration of females’ MSP was highly variable, ranging from 1 to 31 days. Timing of ovulation varied considerably in relation to the onset of the MSP, resulting in a very low day-specific probability of ovulation and fecundity across female cycles. Ovulation occurred during the MSP in only 52.9 % of the analysed swelling cycles, and females showed regular sexual swelling patterns in N = 8 swelling cycles where ovulation did not occur. These findings reveal that sexual swellings of bonobos are less reliable indicators of ovulation compared to other species of primates. Conclusions: Female bonobos show unusual variability in the duration of the MSP and in the timing of ovulation relative to the sexual swelling signal. These data are important for understanding the evolution of sexual signals, how they influence male and female mating strategies, and how decoupling visual signals of fecundity from the periovulatory period may affect intersexual conflict. By prolonging the period during which males would need to mate guard females to ascertain paternity, the temporal variability of this signal may constrain mate-guarding efforts by male bonobos.}}, author = {{Douglas, Pamela Heidi and Hohmann, Gottfried and Murtagh, Róisín and Thiessen-Bock, Robyn and Deschner, Tobias}}, issn = {{1471-2148}}, journal = {{BMC Evolutionary Biology}}, keywords = {{Primate, Sexual signalling, Fecundity, Endocrine analysis, LC–MS/MS, Estrogen, Pan paniscus, Pregnanediol, Mate guarding}}, number = {{1}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Mixed messages: wild female bonobos show high variability in the timing of ovulation in relation to sexual swelling patterns}}}, doi = {{10.1186/s12862-016-0691-3}}, volume = {{16}}, year = {{2016}}, } @inproceedings{9949, abstract = {{Intelligent mechatronic systems other the possibility to adapt system behavior to current dependability. This can be used to assure reliability by controlling system behavior to reach a pre-defined lifetime. By using such closed loop control, the margin of error of useful lifetime of an individual system is lowered. It is also possible to change the pre-defined lifetime during operation, by adapting system behavior to derate component usage. When planning maintenance actions, the remaining useful lifetime of each individual system has to be taken into account. Usually, stochastic properties of a fleet of systems are analyzed to create maintenance plans. Among these, the main factor is the probability of an individual system to last until maintenance. If condition-based maintenance is used, this is updated for each individual system using available information about its current state. By lowering the margin of error of useful lifetime, which directly corresponds to the time until maintenance, extended maintenance periods are made possible. Also using reliability-adaptive operation, a reversal of degradation driven maintenance planning is possible where a maintenance plan is setup not only according to system properties, but mainly to requirements imposed by maintenance personnel or infrastructure. Each system then adapts its behavior accordingly and fails according to the maintenance plan, making better use of maintenance personnel and system capabilities at the same time. In this contribution, the potential of maintenance plan driven system behavior adaptation is shown. A model including adaptation process and maintenance actions is simulated over full system lifetime to assess the advantages gained.}}, author = {{Meyer, Tobias and Kaul, Thorben and Sextro, Walter}}, booktitle = {{Proceedings of the 9th IFAC Symposium on Fault Detection, Supervision and Safety for Technical Processes}}, keywords = {{Adaptive systems, Reliability analysis, Availability, Adaptive control, Maintenance, Self-optimizing systems, Self-optimizing control, Stochastic Petri-nets}}, pages = {{940--945}}, title = {{{Advantages of reliability-adaptive system operation for maintenance planning}}}, doi = {{10.1016/j.ifacol.2015.09.647}}, year = {{2015}}, } @article{38037, author = {{Rösler, Margit and Voit, Michael}}, issn = {{1815-0659}}, journal = {{Symmetry, Integrability and Geometry: Methods and Applications}}, keywords = {{Geometry and Topology, Mathematical Physics, Analysis}}, number = {{013}}, pages = {{18pp}}, publisher = {{SIGMA (Symmetry, Integrability and Geometry: Methods and Application)}}, title = {{{A Central Limit Theorem for Random Walks on the Dual of a Compact Grassmannian}}}, doi = {{10.3842/sigma.2015.013}}, volume = {{11}}, year = {{2015}}, } @inproceedings{1135, abstract = {{In this paper, we describe our system developed for the GErman SenTiment AnaLysis shared Task (GESTALT) for participation in the Maintask 2: Subjective Phrase and Aspect Extraction from Product Reviews. We present a tool, which identifies subjective and aspect phrases in German product reviews. For the recognition of subjective phrases, we pursue a lexicon-based approach. For the extraction of aspect phrases from the reviews, we consider two possible ways: Besides the subjectivity and aspect look-up, we also implemented a method to establish which subjective phrase belongs to which aspect. The system achieves better results for the recognition of aspect phrases than for the subjective identification.}}, author = {{Dollmann, Markus and Geierhos, Michaela}}, booktitle = {{Workshop Proceedings of the 12th Edition of the KONVENS Conference}}, editor = {{Faaß, Gertrud and Ruppenhofer, Josef}}, isbn = {{978-3-934105-47-8}}, keywords = {{corpus linguistics, sentiment analysis}}, location = {{Hildesheim, Germany}}, pages = {{185--191}}, publisher = {{Universitätsverlag Hildesheim}}, title = {{{SentiBA: Lexicon-based Sentiment Analysis on German Product Reviews}}}, year = {{2014}}, } @article{4695, author = {{Debortoli, Stefan and Müller, Oliver and vom Brocke, Jan}}, isbn = {{0910-8327 (Print)$\backslash$n0910-8327 (Linking)}}, issn = {{18670202}}, journal = {{Business and Information Systems Engineering}}, keywords = {{Big data, Business intelligence, Competencies, Latent semantic analysis, Text mining}}, number = {{5}}, pages = {{289----300}}, title = {{{Comparing business intelligence and big data skills: A text mining study using job advertisements}}}, doi = {{10.1007/s12599-014-0344-2}}, year = {{2014}}, } @article{4696, author = {{vom Brocke, Jan and Debortoli, Stefan and Reuter, Nadine and Müller, Oliver}}, issn = {{15293181}}, journal = {{Communications of the Association for Information Systems}}, keywords = {{Advanced business analytics, Big Data, Business intelligence, IT business value, In-memory technology, OLAP, OLTP, Realtime analytics, Sentiment analysis}}, pages = {{151----167}}, title = {{{How In-Memory Technology Can Create Business Value: Lessons Learned from Hilti}}}, doi = {{10.17705/1CAIS.03407}}, year = {{2014}}, } @inproceedings{9868, abstract = {{In order to increase mechanical strength, heat dissipation and ampacity and to decrease failure through fatigue fracture, wedge copper wire bonding is being introduced as a standard interconnection method for mass production. To achieve the same process stability when using copper wire instead of aluminum wire a profound understanding of the bonding process is needed. Due to the higher hardness of copper compared to aluminum wire it is more difficult to approach the surfaces of wire and substrate to a level where van der Waals forces are able to arise between atoms. Also, enough friction energy referred to the total contact area has to be generated to activate the surfaces. Therefore, a friction model is used to simulate the joining process. This model calculates the resulting energy of partial areas in the contact surface and provides information about the adhesion process of each area. The focus here is on the arising of micro joints in the contact area depending on the location in the contact and time. To validate the model, different touchdown forces are used to vary the initial contact areas of wire and substrate. Additionally, a piezoelectric tri-axial force sensor is built up to identify the known phases of pre-deforming, cleaning, adhering and diffusing for the real bonding process to map with the model. Test substrates as DBC and copper plate are used to show the different formations of a wedge bond connection due to hardness and reaction propensity. The experiments were done by using 500 $\mu$m copper wire and a standard V-groove tool.}}, author = {{Althoff, Simon and Neuhaus, Jan and Hemsel, Tobias and Sextro, Walter}}, booktitle = {{Electronic Components and Technology Conference (ECTC), 2014 IEEE 64th}}, keywords = {{adhesion, circuit reliability, deformation, diffusion, fatigue cracks, friction, interconnections, lead bonding, van der Waals forces, Cu, adhering process, adhesion process, ampacity improvement, bond quality improvement, cleaning process, diffusing process, fatigue fracture failure, friction energy, friction model, heat dissipation, mechanical strength, piezoelectric triaxial force sensor, predeforming process, size 500 mum, total contact area, van der Waals forces, wedge copper wire bonding, Bonding, Copper, Finite element analysis, Force, Friction, Substrates, Wires}}, pages = {{1549--1555}}, title = {{{Improving the bond quality of copper wire bonds using a friction model approach}}}, doi = {{10.1109/ECTC.2014.6897500}}, year = {{2014}}, } @inproceedings{9889, abstract = {{A measurement method is presented that combines the advantages of the multisine measurement technique with a prediction method for peak bending behavior. This combination allows the analysis of the dynamic behavior of mechanical structures at distinctly reduced measurement durations and has the advantage of reducing high excitation impacts on the structure under test.}}, author = {{Sprock, Christian and Sextro, Walter}}, booktitle = {{Instrumentation and Measurement Technology Conference (I2MTC) Proceedings, 2014 IEEE International}}, keywords = {{bending, dynamic testing, measurement, structural engineering, vibrations, measurement durations, mechanical structures, multisine measurement technique, nonlinear peak bending behavior, prediction method, time-efficient dynamic analysis, Heuristic algorithms, Nonlinear systems, Oscillators, Time measurement, Time-frequency analysis, Vibrations}}, pages = {{320--324}}, title = {{{Time-efficient dynamic analysis of structures exhibiting nonlinear peak bending}}}, doi = {{10.1109/I2MTC.2014.6860760}}, year = {{2014}}, }