@article{34844, abstract = {{Let k be a number field, K/k a finite Galois extension with Galois group G, χ a faithful character of G. We prove that the Artin L-function L(s,χ,K/k) determines the Galois closure of K over $\ℚ$. In the special case $k=\ℚ$ it also determines the character χ. }}, author = {{Klüners, Jürgen and Nicolae, Florin}}, issn = {{0022-314X}}, journal = {{Journal of Number Theory}}, keywords = {{Algebra and Number Theory}}, pages = {{161--168}}, publisher = {{Elsevier BV}}, title = {{{Are number fields determined by Artin L-functions?}}}, doi = {{10.1016/j.jnt.2016.03.023}}, volume = {{167}}, year = {{2016}}, } @article{42792, abstract = {{We enumerate all positive definite ternary quadratic forms over number fields with class number at most 2. This is done by constructing all definite quaternion orders of type number at most 2 over number fields. Finally, we list all definite quaternion orders of ideal class number 1 or 2.}}, author = {{Kirschmer, Markus and Lorch, David}}, issn = {{0022-314X}}, journal = {{Journal of Number Theory}}, keywords = {{Algebra and Number Theory}}, pages = {{343--361}}, publisher = {{Elsevier BV}}, title = {{{Ternary quadratic forms over number fields with small class number}}}, doi = {{10.1016/j.jnt.2014.11.001}}, volume = {{161}}, year = {{2016}}, } @inproceedings{1144, abstract = {{Adopting the concept of “Local Grammars” (M. Gross), which were successfully applied in practice by (Geierhos, 2010) to biographical information extraction in English our project aims to detect, encode, and finally visualize relations between persons. Our corpus consists of the digitised biographical lexicon “Neue Deutsche Biographie (NDB)”, roughly 21.000 biographies in 25 volumes in print since 1953. We developed local grammars and suitable dictionaries to describe interpersonal relations and applied them to the corpus with Unitex 3.1. The local grammars were designed to integrate existing TEI-XML structures in the corpus. Using the ability of local grammars in Unitex to act as transducers we were able to produce XML-Tags and encode semantic information. Based on grammars for personal names and places we described interpersonal relations like to study, predecessors and successors as well as friends and circles. Afterwards we identified persons (as given in the authority file or index). Finally we displayed relations on our website in an interactive and dynamic way. Utilizing the Javascript library D3.js we represented named relations between identified individuals as ego centred network graphs.}}, author = {{Stotz, Sophia and Stuß, Valentina and Reinert , Matthias and Schrott, Maximilian}}, booktitle = {{Proceedings of the First Conference on Biographical Data in a Digital World 2015}}, editor = {{ter Braake, Serge and Fokkens, Antske and Sluijter, Ronald and Declerck, Thierry and Wandl-Vogt, Eveline}}, issn = {{16130073}}, keywords = {{Local Grammar, Relation Extraction, Visualisation}}, location = {{Amsterdam, Netherlands}}, pages = {{74--80}}, publisher = {{CEUR-WS.org}}, title = {{{Interpersonal relations in biographical dictionaries. A case study}}}, volume = {{1399}}, year = {{2015}}, } @inproceedings{5588, abstract = {{The protection of information technology (IT) has become and is predicted to remain a key economic challenge for organizations. While research on IT security investment is fast growing, it lacks a theoretical basis for structuring research, explaining economic-technological phenomena and guide future research. We address this shortcoming by suggesting a new theoretical model emerging from a multi-theoretical perspective adopt-ing the Resource-Based View and the Organizational Learning Theory. The joint appli-cation of these theories allows to conceptualize in one theoretical model the organiza-tional learning effects that occur when the protection of organizational resources through IT security countermeasures develops over time. We use this model of IT security invest-ments to synthesize findings of a large body of literature and to derive research gaps. We also discuss managerial implications of (closing) these gaps by providing practical ex-amples.}}, author = {{Weishäupl, Eva and Yasasin, Emrah and Schryen, Guido}}, booktitle = {{International Conference on Information Systems}}, keywords = {{Information Security, Investment, Literature review, Resource-based View, Organi-zational Learning Theory, Multi-theoretical Perspective}}, title = {{{A Multi-Theoretical Literature Review on Information Security Investments using the Resource-Based View and the Organizational Learning Theory}}}, year = {{2015}}, } @inproceedings{5590, abstract = {{Nowadays, providing employees with failure-free access to various systems, applications and services is a crucial factor for organizations? success as disturbances potentially inhibit smooth workflows and thereby harm productivity. However, it is a challenging task to assign access rights to employees? accounts within a satisfying time frame. In addition, the management of multiple accounts and identities can be very onerous and time consuming for the responsible administrator and therefore expensive for the organization. In order to meet these challenges, firms decide to invest in introducing an Identity and Access Management System (IAMS) that supports the organization by using policies to assign permissions to accounts, groups, and roles. In practice, since various versions of IAMSs exist, it is a challenging task to decide upon introduction of an IAMS. The following study proposes a first attempt of a decision support model for practitioners which considers four alternatives: Introduction of an IAMS with Role-based Access Control RBAC) or without and no introduction of IAMS again with or without RBAC. To underpin the practical applicability of the proposed model, we parametrize and operationalize it based on a real world use case using input from an expert interview.}}, author = {{Weishäupl, Eva and Kunz, Michael and Yasasin, Emrah and Wagner, Gerit and Prester, Julian and Schryen, Guido and Pernul, Günther}}, booktitle = {{2nd International Workshop on Security in highly connected IT Systems (SHCIS?15)}}, keywords = {{Identity and Access Management, Economic Decision Making, Information Systems, Information Security Investment, Decision Theory}}, title = {{{Towards an Economic Approach to Identity and Access Management Systems Using Decision Theory}}}, year = {{2015}}, } @inproceedings{5618, abstract = {{Literature reviews play an important role in the development of knowledge. Yet, we observe a lack of theoretical underpinning of and epistemological insights into how literature reviews can contribute to knowledge creation and have actually contributed in the IS discipline. To address these theoretical and empirical research gaps, we suggest a novel epistemological model of literature reviews. This model allows us to align different contributions of literature reviews with their underlying knowledge conversions - thereby building a bridge between the previously largely unconnected fields of literature reviews and epistemology. We evaluate the appropriateness of the model by conducting an empirical analysis of 173 IS literature reviews which were published in 39 pertinent IS journals between 2000 and 2014. Based on this analysis, we derive an epistemological taxonomy of IS literature reviews, which complements previously suggested typologies.}}, author = {{Schryen, Guido and Wagner, Gerit and Benlian, Alexander}}, booktitle = {{International Conference on Information Systems (ICIS)}}, keywords = {{Literature review, Research methods/methodology, Theory of knowledge}}, title = {{{Theory of Knowledge for Literature Reviews: An Epistemological Model, Taxonomy and Empirical Analysis of IS Literature}}}, year = {{2015}}, } @inproceedings{17661, author = {{King, Thomas C. and Liu, Qingzhi and Polevoy, Gleb and de Weerdt, Mathijs and Dignum, Virginia and van Riemsdijk, M. Birna and Warnier, Martijn}}, booktitle = {{Proceedings of the 2014 International Conference on Autonomous Agents and Multi-agent Systems}}, isbn = {{978-1-4503-2738-1}}, keywords = {{crowd-sensing, crowdsourcing, data aggregation, game theory, norms, reciprocation, self interested agents, simulation}}, pages = {{1651--1652}}, publisher = {{International Foundation for Autonomous Agents and Multiagent Systems}}, title = {{{Request Driven Social Sensing}}}, year = {{2014}}, } @article{4697, author = {{Sommerauer, Peter and Müller, Oliver}}, isbn = {{0360-1315}}, issn = {{03601315}}, journal = {{Computers and Education}}, keywords = {{Augmented reality, Cognitive theory of multimedia learning, Field experiment, Informal learning, Museum}}, pages = {{59----68}}, title = {{{Augmented reality in informal learning environments: A field experiment in a mathematics exhibition}}}, doi = {{10.1016/j.compedu.2014.07.013}}, year = {{2014}}, } @article{34845, abstract = {{Computational Galois theory, in particular the problem of computing the Galois group of a given polynomial, is a very old problem. Currently, the best algorithmic solution is Stauduhar’s method. Computationally, one of the key challenges in the application of Stauduhar’s method is to find, for a given pair of groups H