@inproceedings{ZwicklbauerSeifertGranitzer2016, author = {Zwicklbauer, Stefan and Seifert, Christin and Granitzer, Michael}, title = {Robust and Collective Entity Disambiguation through Semantic Embeddings}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:739-opus4-3704}, year = {2016}, abstract = {Entity disambiguation is the task of mapping ambiguous terms in natural-language text to its entities in a knowledge base. It finds its application in the extraction of structured data in RDF (Resource Description Framework) from textual documents, but equally so in facilitating artificial intelligence applications, such as Semantic Search, Reasoning and Question \& Answering. We propose a new collective, graph-based disambiguation algorithm utilizing semantic entity and document embeddings for robust entity disambiguation. Robust thereby refers to the property of achieving better than state-of-the-art results over a wide range of very different data sets. Our approach is also able to abstain if no appropriate entity can be found for a specific surface form. Our evaluation shows, that our approach achieves significantly (>5\%) better results than all other publicly available disambiguation algorithms on 7 of 9 datasets without data set specific tuning. Moreover, we discuss the influence of the quality of the knowledge base on the disambiguation accuracy and indicate that our algorithm achieves better results than non-publicly available state-of-the-art algorithms.}, language = {en} } @inproceedings{Steller2009, author = {Steller, Lea-Katharina}, title = {The quality of mental-intellectual ability - oder eine typische Biografie l{\"a}sst sich erz{\"a}hlen}, organization = {W{\"u}nsch, Thomas (Prof. Dr.)}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:739-opus-22257}, year = {2009}, abstract = {Zum Thema „Schlesischer Adel im 20. Jahrhundert. Krisenerfahrung, Elitentransformation und Selbstverst{\"a}ndnis im Zeitalter der Extreme" habe ich als „typical biography" die Lebensgeschichte von Petra W. (43) gew{\"a}hlt. Petras Urgroßeltern von v{\"a}terlicher Seite geh{\"o}rten dem Schlesischen und B{\"o}hmischen Adel, die Großeltern wurden nach dem zweiten Weltkrieg nach Ungarn in die Puszta deportiert. Ihre Eltern haben unter magyarisierten Namen studiert, und fast nicht mit ihr Deutsch gesprochen - aber die promovierte Petra hat ihre Stolz und Stehaufm{\"a}nnchenf{\"a}higkeit geerbt. Ab 2003 lebt sie in Deutschland, ihr deutscher Wiedereinb{\"u}rgerungsantrag wurde jahrelang und regelm{\"a}ßig - ohne schriftliche Antwort - w{\"o}rtlich abgelehnt. Ihre obligatorischen Integrationskurserfahrungen (zusammen mit Rußlanddeutschen und T{\"u}rken) und die Diplomanerkennungsprozeduren waren f{\"u}r sie tief ersch{\"u}tternd. Hat Petra, „die h{\"o}here Tochter" aus der dritten titel- und verm{\"o}genslosen ostst{\"a}mmigen Adelsgeneration in Deutschland eigentlich Zukunftsperspektiven am Anfang des 21sten Jahrhunderts?}, subject = {Geschichte}, language = {de} } @inproceedings{Satur2012, author = {Satur, Luzile Mae}, title = {Transformation of Cagayan de Oro 1945-1980: from a traditional town to an urban centre}, editor = {Gaynor, Andrea and Gralton, Elizabeth and Gregory, Jenny and McQuade, Sarah}, publisher = {The University of Western Australia}, address = {Australia}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:739-opus4-2731}, pages = {306 -- 321}, year = {2012}, abstract = {This study is an urban history of Cagayan de Oro (Northern Mindanao, Philippines), a city in a developing region, which faced urban transformation from the end of WWII in 1945 to 1980. It employed a multidisciplinary approach wherein the city's demographic, economic and infrastructural changes were analyzed. The study revealed that Cagayan had grown and transformed from a traditional town into an urban centre whereby its demography had continuously expanded with high rates of natural increase and large streams of in-migrants; while its economic activities had shifted from agricultural production to commerce and industrialization. Its economic transition was due to the promotion of Cagayan as the "Gateway to the South" or "Gateway to Northern Mindanao" by the deciding elites who were part of the transnational economic system that supplied resources to the developed countries such as the United States and Japan. As a result, the growth of Cagayan was not directed towards the masses but instead to the elites and their foreign allies. Cagayan experienced inertia in terms of infrastructural development. Therefore the absorption of foreign structures resulted to an artificial form of urban transformation in Cagayan.}, language = {en} } @inproceedings{ParraRodriguezSchrecklingPosegga2017, author = {Parra Rodriguez, Juan D. and Schreckling, Daniel and Posegga, Joachim}, title = {Addressing Data-Centric Security Requirements for IoT-Based Systems}, series = {2016 International Workshop on Secure Internet of Things (SIoT)}, booktitle = {2016 International Workshop on Secure Internet of Things (SIoT)}, publisher = {IEEE Xplore}, address = {Heraklion, Greece}, isbn = {978-1-5090-5091-8}, doi = {10.1109/SIoT.2016.007}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:739-opus4-6546}, pages = {[10] Seiten}, year = {2017}, abstract = {Allowing users to control access to their data is paramount for the success of the Internet of Things; therefore, it is imperative to ensure it, even when data has left the users' control, e.g. shared with cloud infrastructure. Consequently, we propose several state of the art mechanisms from the security and privacy research fields to cope with this requirement. To illustrate how each mechanism can be applied, we derive a data-centric architecture providing access control and privacy guaranties for the users of IoT-based applications. Moreover, we discuss the limitations and challenges related to applying the selected mechanisms to ensure access control remotely. Also, we validate our architecture by showing how it empowers users to control access to their health data in a quantified self use case.}, language = {en} } @inproceedings{ParraRodriguezPosegga2018, author = {Parra Rodriguez, Juan D. and Posegga, Joachim}, title = {RAPID: Resource and API-Based Detection Against In-Browser Miners}, series = {Proceedings of the 34th Annual Computer Security Applications Conference}, booktitle = {Proceedings of the 34th Annual Computer Security Applications Conference}, publisher = {ACM}, address = {New York, NY, USA}, isbn = {978-1-4503-6569-7}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:739-opus4-6550}, pages = {[14] Seiten}, year = {2018}, abstract = {Direct access to the system's resources such as the GPU, persistent storage and networking has enabled in-browser crypto-mining. Thus, there has been a massive response by rogue actors who abuse browsers for mining without the user's consent. This trend has grown steadily for the last months until this practice, i.e., CryptoJacking, has been acknowledged as the number one security threat by several antivirus companies. Considering this, and the fact that these attacks do not behave as JavaScript malware or other Web attacks, we propose and evaluate several approaches to detect in-browser mining. To this end, we collect information from the top 330.500 Alexa sites. Mainly, we used real-life browsers to visit sites while monitoring resource-related API calls and the browser's resource consumption, e.g., CPU. Our detection mechanisms are based on dynamic monitoring, so they are resistant to JavaScript obfuscation. Furthermore, our detection techniques can generalize well and classify previously unseen samples with up to 99.99\\% precision and recall for the benign class and up to 96\\% precision and recall for the mining class. These results demonstrate the applicability of detection mechanisms as a server-side approach, e.g., to support the enhancement of existing blacklists. Last but not least, we evaluated the feasibility of deploying prototypical implementations of some detection mechanisms directly on the browser. Specifically, we measured the impact of in-browser API monitoring on page-loading time and performed micro-benchmarks for the execution of some classifiers directly within the browser. In this regard, we ascertain that, even though there are engineering challenges to overcome, it is feasible and beneficial for users to bring the mining detection to the browser.}, language = {en} } @inproceedings{ParraRodriguezPosegga2018, author = {Parra Rodriguez, Juan D. and Posegga, Joachim}, title = {Local Storage on Steroids: Abusing Web Browsers for Hidden Content Storage and Distribution}, series = {International Conference on Security and Privacy in Communication Systems}, booktitle = {International Conference on Security and Privacy in Communication Systems}, publisher = {Springer}, address = {Cham}, isbn = {978-3-030-01704-0}, doi = {10.1007/978-3-030-01704-0_19}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:739-opus4-6572}, pages = {20 Seiten}, year = {2018}, abstract = {Analysing security assumptions taken for the WebRTC and postMessage APIs led us to find a novel attack abusing the browsers' persistent storage capabilities. The presented attack can be executed without the website's visitor knowledge, and it requires neither browser vulnerabilities nor additional software on the browser's side. To exemplify this, we study how can an attacker use browsers to create a network for persistent storage and distribution of arbitrary data. In our proof of concept, the total storage of the network, and therefore the space used within each browser, grows linearly with the number of origins delivering the malicious JavaScript code. Further, data transfers between browsers are not restricted by the Same Origin Policy, which allows for a unified cross-origin browser network, regardless of the origin from which the script executing the functionality is loaded from. In the course of our work, we assess the feasibility of a real-life deployment of the network by running experiments using Linux containers and browser automation tools. Moreover, we show how security mechanisms against third-party tracking, cross-site scripting and click-jacking can diminish the attack's impact, or even prevent it.}, language = {en} } @inproceedings{ParraRodriguezPosegga2017, author = {Parra Rodriguez, Juan D. and Posegga, Joachim}, title = {CSP \& Co. Can Save Us from a Rogue Cross-Origin Storage Browser Network! But for How Long?}, series = {Proceedings of the Eighth ACM Conference on Data and Application Security and Privacy}, booktitle = {Proceedings of the Eighth ACM Conference on Data and Application Security and Privacy}, publisher = {ACM}, address = {New York, NY, USA}, isbn = {978-1-4503-5632-9}, doi = {10.1145/3176258.3176951}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:739-opus4-6561}, pages = {3 Seiten}, year = {2017}, abstract = {We introduce a new browser abuse scenario where an attacker uses local storage capabilities without the website's visitor knowledge to create a network of browsers for persistent storage and distribution of arbitrary data. We describe how security-aware users can use mechanisms such as the Content Security Policy (CSP), sandboxing, and third-party tracking protection, i.e., CSP \& Company, to limit the network's effectiveness. From another point of view, we also show that the upcoming Suborigin standard can inadvertently thwart existing countermeasures, if it is adopted.}, language = {en} } @inproceedings{BergerReiserSousaetal.2019, author = {Berger, Christian and Reiser, Hans P. and Sousa, Jo{\~a}o and Bessani, Alysson}, title = {Resilient Wide-Area Byzantine Consensus Using Adaptive Weighted Replication}, series = {38th IEEE International Symposium on Reliable Distributed Systems (SRDS 2019)}, booktitle = {38th IEEE International Symposium on Reliable Distributed Systems (SRDS 2019)}, publisher = {IEEE Xplore}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:739-opus4-7537}, pages = {10 Seiten}, year = {2019}, abstract = {In geo-replicated systems, the heterogeneous latencies of connections between replicas limit the system's ability to achieve fast consensus. State machine replication (SMR) protocols can be refined for their deployment in wide-area networks by using a weighting scheme for active replication that employs additional replicas and assigns higher voting power to faster replicas. Utilizing more variability in quorum formation allows replicas to swifter proceed to subsequent protocol stages, thus decreasing consensus latency. However, if network conditions vary during the system's lifespan or faults occur, the system needs a solution to autonomously adjust to new conditions. We incorporate the idea of self-optimization into geographically distributed, weighted replication by introducing AWARE, an automated and dynamic voting weight tuning and leader positioning scheme. AWARE measures replica-replica latencies and uses a prediction model, thriving to minimize the system's consensus latency. In experiments using different Amazon EC2 regions, AWARE dynamically optimizes consensus latency by self-reliantly finding a fast weight configuration yielding latency gains observed by clients located across the globe.}, language = {en} } @inproceedings{BergerReiser2018, author = {Berger, Christian and Reiser, Hans P.}, title = {Scaling Byzantine Consensus: A Broad Analysis}, series = {SERIAL'18 Proceedings of the 2nd Workshop on Scalable and Resilient Infrastructures for Distributed Ledgers}, booktitle = {SERIAL'18 Proceedings of the 2nd Workshop on Scalable and Resilient Infrastructures for Distributed Ledgers}, publisher = {ACM}, address = {New York, NY, USA}, isbn = {978-1-4503-6110-1}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:739-opus4-7526}, pages = {6 Seiten}, year = {2018}, abstract = {Blockchains and distributed ledger technology (DLT) that rely on Proof-of-Work (PoW) typically show limited performance. Several recent approaches incorporate Byzantine fault-tolerant (BFT) consensus protocols in their DLT design as Byzantine consensus allows for increased performance and energy efficiency, as well as it offers proven liveness and safety properties. While there has been a broad variety of research on BFT consensus protocols over the last decades, those protocols were originally not intended to scale for a large number of nodes. Thus, the quest for scalable BFT consensus was initiated with the emerging research interest in DLT. In this paper, we first provide a broad analysis of various optimization techniques and approaches used in recent protocols to scale Byzantine consensus for large environments such as BFT blockchain infrastructures. We then present an overview of both efforts and assumptions made by existing protocols and compare their solutions.}, language = {en} } @inproceedings{OPUS4-181, title = {Proceedings of the 3rd International Workshop on Polyhedral Compilation Techniques}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:739-opus-26930}, year = {2013}, abstract = {IMPACT 2013 in Berlin, Germany (in conjuction with HiPEAC 2013) is the third workshop in a series of international workshops on polyhedral compilation techniques. The previous workshops were held in Chamonix, France (2011) in conjuction with CGO 2011 and Paris, France (2012) in conjuction with HiPEAC 2012.}, subject = {Optimierender Compiler}, language = {en} }