TY - GEN AU - Blömer, Johannes AU - Brauer, Sascha AU - Bujna, Kathrin ID - 2969 TI - Hard-Clustering with Gaussian Mixture Models ER - TY - CONF AB - Welche Informationen über Unternehmenszusammenschlüsse werden in Zeitungsnachrichten vermittelt, und wie können diese Informationen automatisch extrahiert werden? Dies soll am Beispiel des Verhaltens von Aktionären während eines Zusammenschlusses ermittelt werden. Dazu werden die wichtigsten Aussagen über das Votum der Aktionäre im Hinblick auf eine automatische Erkennung sprachlich analysiert. Im Fokus stehen dabei die Berichte über Aktionärsabstimmungen hinsichtlich der Annahme bzw. Ablehnung eines Übernahmeangebots. AU - Stotz, Sophia AU - Geierhos, Michaela ID - 1151 SN - 978-3-941379-05-3 T2 - DHd 2016: Modellierung - Vernetzung - Visualisierung. Die Digital Humanities als fächerübergreifendes Forschungsparadigma. Konferenzabstracts, Universität Leipzig, 7. bis 12. März 2016 TI - Wie verhalten sich Aktionäre bei Unternehmenszusammenschlüssen? Modellierung sprachlicher Muster zur Analyse treibender Faktoren bei der Berichterstattung ER - TY - GEN AU - Geierhos, Michaela ED - Gronau, Norbert ED - Becker, Jörg ED - Sinz, Elmar ED - Suhl, Leena ED - Leimeister, Jan M. ID - 1152 KW - Webmonitoring T2 - Enzyklopädie der Wirtschaftsinformatik TI - Webmonitoring ER - TY - GEN AU - Geierhos, Michaela ED - Gronau, Norbert ED - Becker, Jörg ED - Sinz, Elmar ED - Suhl, Leena ED - Leimeister, Jan M. ID - 1153 KW - Sentimentanalyse T2 - Enzyklopädie der Wirtschaftsinformatik TI - Sentimentanalyse ER - TY - GEN AU - Geierhos, Michaela ED - Gronau, Norbert ED - Becker, Jörg ED - Sinz, Elmar ED - Suhl, Leena ED - Leimeister, Jan M. ID - 1154 KW - Text Mining T2 - Enzyklopädie der Wirtschaftsinformatik TI - Text Mining ER - TY - GEN AU - Geierhos, Michaela ED - Gronau, Norbert ED - Becker, Jörg ED - Sinz, Elmar ED - Suhl, Leena ED - Leimeister, Jan M. ID - 1155 KW - Crawler T2 - Enzyklopädie der Wirtschaftsinformatik TI - Crawler (fokussiert / nicht fokussiert) ER - TY - CONF AB - Users prefer natural language software requirements because of their usability and accessibility. When they describe their wishes for software development, they often provide off-topic information. We therefore present an automated approach for identifying and semantically annotating the on-topic parts of the given descriptions. It is designed to support requirement engineers in the requirement elicitation process on detecting and analyzing requirements in user-generated content. Since no lexical resources with domain-specific information about requirements are available, we created a corpus of requirements written in controlled language by instructed users and uncontrolled language by uninstructed users. We annotated these requirements regarding predicate-argument structures, conditions, priorities, motivations and semantic roles and used this information to train classifiers for information extraction purposes. The approach achieves an accuracy of 92% for the on- and off-topic classification task and an F1-measure of 72% for the semantic annotation. AU - Dollmann, Markus AU - Geierhos, Michaela ID - 176 T2 - Proceedings of the 2016 Conference on Empirical Methods in Natural Language Processing (EMNLP) TI - On- and Off-Topic Classification and Semantic Annotation of User-Generated Software Requirements ER - TY - JOUR AB - Die (Wieder-)Einführung einer Vermögensteuer ist in den vergangenen Jahren erneut in den Fokus der politischen Diskussion gerückt. Der vorliegende Beitrag vermittelt einen Eindruck von den Belastungswirkungen, die aus der Umsetzung von aktuell vorliegenden Besteuerungskonzepten resultieren würden. Auf der Basis von realen Jahresabschlussdaten wird eine mehrperiodige Veranlagungssimulation durchgeführt, die insbesondere ermöglicht, den zu erwartenden Eigenkapitalverzehr sowie den Anstieg der Steuerbelastung für die betrachtete Stichprobe zu quantifizieren. Von besonderem Interesse sind hierbei Unternehmen, deren laufende Erträge nicht ausreichen, um die Belastungen durch die Vermögensteuer zu tragen und damit einem Substanzverzehr ausgesetzt sind. Es zeigt sich, dass etwa die Hälfte der Unternehmen im Untersuchungszeitraum von sechs Jahren in mindestens einem Jahr einen Substanzverzehr erfährt. Der Vermögensteuer kommt somit keinesfalls der vielfach postulierte Charakter einer eher mäßig belastenden und im Wesentlichen substanzverschonenden Steuer zu. Zusatzbelastungen von knapp 100 bis zu 300 % der Ertragsteuerlast sind keine Seltenheit und veranschaulichen das Gefährdungspotenzial dieser Steuer für den Wirtschaftsstandort Deutschland. AU - Hoppe, Thomas AU - Maiterth, Ralf AU - Sureth-Sloane, Caren ID - 1771 IS - 1 JF - Schmalenbachs Zeitschrift für betriebswirtschaftliche Forschung KW - Steuerbelastung KW - Substanzbesteuerung KW - Ungleiche Vermögensverteilung KW - Veranlagungssimulation KW - Vermögensteuer SN - 0341-2687 TI - Eigenkapitalverzehr und Substanzbesteuerung deutscher Unternehmen durch eine Vermögensteuer – eine empirische Analyse VL - 68 ER - TY - GEN AB - We study the willingness to compete in a cognitive task among an entire cohort of fresh man business and economics students. Combining data from a lab-in-thefield experiment with university admissions data, we trace the gender gap in competitiveness at different levels of high school performance. Our results confirm that, on average, men choose to compete more often. The gender gap disappears, however, among students with above average high school performance. Female high school top performers are equally competitive as their male counterparts. In fact, the overall gender gap is entirely driven by the group of female high school underperformers who shied away from competition, even when they performed well in our task. Overall, our findings suggest that high school grades are more than just a signal of cognitive abilities, because they seem to influence the receivers selfperception of his or her performance in a competitive environment involved in later on in life. AU - Hoyer, Britta AU - van Huizen, Tomas AU - Keijzer, Linda AU - Rezai Khavas, Tahere AU - Rosenkranz, Stephanie ID - 2252 TI - Do talented women shy away from competition? VL - 16-06 ER - TY - CONF AU - Schumacher, Jan ID - 7765 T2 - Beiträge zum Mathematikunterricht 2016 TI - Erkunden mathematischer Strukturen anstatt Interpretation in Modellen – Ein innermathematischer Zugang zu negativen Zahlen ER - TY - JOUR AU - Rauchecker, Gerhard AU - Schryen, Guido ID - 5676 JF - Im Einsatz TI - Projekt KUBAS: Koordination ungebundener Vor-Ort-Helfer VL - 23 ER - TY - JOUR AB - The Service Programming and Orchestration for Virtualised Software Networks (SONATA) project targets both the flexible programmability of software networks and the optimisation of their deployments by means of integrating Development and Operations in order to accelerate industry adoption of software networks and reduce time-to-market for networked services. SONATA supports network function chaining and orchestration, making service platforms modular and easier to customise to the needs of different service providers, and introduces a specialised Development and Operations model for supporting developers. AU - Karl, Holger AU - Dräxler, Sevil AU - Peuster, Manuel AU - Galis, Alex AU - Bredel, Michael AU - Ramos, Aurora AU - Martrat, Josep AU - Siddiqui, Muhammad Shuaib AU - van Rossem, Steven AU - Tavernier, Wouter AU - Xilouris, George ID - 714 IS - 9 JF - Transactions on Emerging Telecommunications Technologies SN - 2161-3915 TI - DevOps for network function virtualisation: an architectural approach VL - 27 ER - TY - CONF AB - Allocating resources to virtualized network functions and services to meet service level agreements is a challenging task for NFV management and orchestration systems. This becomes even more challenging when agile development methodologies, like DevOps, are applied. In such scenarios, management and orchestration systems are continuously facing new versions of functions and services which makes it hard to decide how much resources have to be allocated to them to provide the expected service performance. One solution for this problem is to support resource allocation decisions with performance behavior information obtained by profiling techniques applied to such network functions and services. In this position paper, we analyze and discuss the components needed to generate such performance behavior information within the NFV DevOps workflow. We also outline research questions that identify open issues and missing pieces for a fully integrated NFV profiling solution. Further, we introduce a novel profiling mechanism that is able to profile virtualized network functions and entire network service chains under different resource constraints before they are deployed on production infrastructure. AU - Peuster, Manuel AU - Karl, Holger ID - 730 T2 - Fifth European Workshop on Software-Defined Networks, EWSDN 2016, Den Haag, The Netherlands, October 10-11, 2016 TI - Understand Your Chains: Towards Performance Profile-Based Network Service Management ER - TY - CONF AB - Elastic deployments of virtualized network functions~(VNF) can automatically scale the amount of used resources in relation to their workload. This is often done by starting new VNF instances or stopping old ones. A problem of these scale operations is that most network functions are stateful and their internal state is not automatically migrated when traffic is redistributed in the deployment. As a result, mechanisms are needed to exchange or migrate internal network function state between VNF instances. This paper presents a state management framework that creates a logically distributed state store on top of elastically deployed virtual network functions. We also introduce a novel programming model that provides both a local and a global view of the state to each VNF instance. We discuss the integration of our framework into existing network function virtualization architectures and compare the performance of our prototype to a centralized and a distributed state store solution. AU - Peuster, Manuel AU - Karl, Holger ID - 732 T2 - IEEE NetSoft Conference and Workshops, NetSoft 2016, Seoul, South Korea, June 6-10, 2016 TI - E-State: Distributed state management in elastic network function deployments ER - TY - CONF AB - Virtualized network services consisting of multiple individual network functions are already today deployed across multiple sites, so called multi-PoP (points of presence) environments. This allows to improve service performance by optimizing its placement in the network. But prototyping and testing of these complex distributed software systems becomes extremely challenging. The reason is that not only the network service as such has to be tested but also its integration with management and orchestration systems. Existing solutions, like simulators, basic network emulators, or local cloud testbeds, do not support all aspects of these tasks. To this end, we introduce MeDICINE, a novel NFV prototyping platform that is able to execute production-ready network functions, provided as software containers, in an emulated multi-PoP environment. These network functions can be controlled by any third-party management and orchestration system that connects to our platform through standard interfaces. Based on this, a developer can use our platform to prototype and test complex network services in a realistic environment running on his laptop. AU - Peuster, Manuel AU - Karl, Holger AU - van Rossem, Steven ID - 738 T2 - IEEE Conference on Network Function Virtualization and Software Defined Networks (NFV-SDN) TI - MeDICINE: Rapid Prototyping of Production-Ready Network Services in Multi-PoP Environments ER - TY - CONF AU - Wagner, Gerit AU - Prester, Julian AU - Roche, Maria AU - Benlian, Alexander AU - Schryen, Guido ID - 5595 T2 - International Conference on Information Systems TI - Factors Affecting the Scientific Impact of Literature Reviews: A Scientometric Study ER - TY - JOUR AB - CAPTCHAs are challenge-response tests that aim at preventing unwanted machines, including bots, from accessing web services while providing easy access for humans. Recent advances in artificial-intelligence based attacks show that the level of security provided by many state-of-the-art text-based CAPTCHAs is declining. At the same time, techniques for distorting and obscuring the text, which are used to maintain the level of security, make text-based CAPTCHAs diffcult to solve for humans, and thereby further degrade usability. The need for developing alternative types of CAPTCHAs which improve both, the current security and usability levels, has been emphasized by several researchers. With this study, we contribute to research through (1) the development of two new face recognition CAPTCHAs (Farett-Gender and Farett-Gender&Age), (2) the security analysis of both procedures, and (3) the provision of empirical evidence that one of the suggested CAPTCHAs (Farett-Gender) is similar to Google's reCAPTCHA and better than KCAPTCHA concerning effectiveness (error rates), superior to both regarding learnability and satisfaction but not effciency. AU - Schryen, Guido AU - Wagner, Gerit AU - Schlegel, Alexander ID - 5617 IS - July JF - Computers & Security KW - CAPTCHA KW - Usability KW - Facial features KW - Gender classiffcation KW - Age classification KW - Face recognition reverse Turing test TI - Development of two novel face-recognition CAPTCHAs: a security and usability study VL - 60 ER - TY - JOUR AU - Claes, Leander AU - Meyer, Thorsten AU - Bause, Fabian AU - Rautenberg, Jens AU - Henning, Bernd ID - 6555 IS - 1 JF - Journal of Sensors and Sensor Systems SN - 2194-878X TI - Determination of the material properties of polymers using laser-generated broadband ultrasound VL - 5 ER - TY - CONF AU - Wolters, Dennis AU - Gerth, Christian AU - Engels, Gregor ID - 6739 T2 - Proceedings of the CAiSE'18 Forum at the 28th International Conference on Advanced Information Systems Engineering (CAiSE'16) TI - Modeling Cross-Device Systems with Use Case Diagrams VL - 1612 ER - TY - CONF AB - Network function virtualization and software-defined networking allow services consisting of virtual network functions to be designed and implemented with great flexibility by facilitating automatic deployments, migrations, and reconfigurations for services and their components. For extended flexibility, we go beyond seeing services as a fixed chain of functions. We present a YANG model for describing the service structure in deployment requests in a flexible way that enables changing the order of functions in case the order of traversing them does not affect the functionality of the service. Upon receiving such requests, the network orchestration system can choose the optimal composition of service components that gives the best results for placement of services in the network. This introduces new complexities to the placement problem by greatly increasing the number of possible ways a service can be composed. In this paper, we describe a heuristic solution that selects a Pareto set of the possible compositions of a service as well as possible combinations of different services, with respect to different resource requirements of the services. Our evaluations show that the selected combinations consist of representative samples of possible structures and requirements and therefore, can result in optimal or close-to-optimal placement results. AU - Dräxler, Sevil AU - Karl, Holger ID - 166 T2 - Proceedings of the 2nd International IEEE Conference on Network Softwarization (NetSoft) TI - Placement of Services with Flexible Structures Specified by a YANG Data Model ER -