Der Rückblick zum TEWI-Kolloquium von Prof. Stefan Wagner am 1.6.2015 beinhaltet die Folien:

Abstract: Cloning means the use of copy-paste as method in developing software artefacts. This practice has several problems, such as unnecessary increase of these artefacts, and thereby increased comprehension and change efforts, as well as potential inconsistencies. The automatic detection of clones has been a topic for research for several years now and we have made huge progress in terms of precision and recall. This led to a series of empirical analyses we have performed on the effects and the amount of cloning in code, models and requirements. We continue to investigate the effects of cloning and work on extending clone detection to functionally similar code. This talk will give insights into how clone detection works and the empirical results we have gathered.

Short CV: Stefan Wagner is full professor for software engineering at the University of Stuttgart. He holds a PhD in computer science from TU Munich, where he also worked as a post-doc. His main research interests are quality engineering, requirements engineering, agile software development and safety engineering; all tackled using empirical research.

Abstract:
Side-channel analysis have been introduced in the late nineties by Kocher et al. [1] to recover the secret keys of cryptographic implementations by exploiting the information leaked over side-channels. For embedded cryptographic devices typical side-channels are represented by the power consumption or by the electro-magnetic (EM) field emanations of physical implementations when executing cryptographic algorithms. Over the last two decades a lot of side-channel attacks have been developed and a variety of countermeasures have been proposed in literature to thwart side-channel analysis. Nevertheless, the quest after improved attacks and countermeasures is still a very active area of research, as testified by the many conferences and recent developments. In this talk, we provide an introduction to side-channel attacks covering some main topics like measurement setup, leakage models and statistical analysis. Then, we provide an overview on typical countermeasures against side-channel attacks covering different level of abstractions (circuit, algorithmic and protocol level).

[1] P. Kocher, J. Jaffe, and B. Jun. Differential Power Analysis. In M.J. Wiener, editor, Advances in Cryptology – CRYPTO ?99, volume 1666 of Lecture Notes in Computer Science, pages 388-397. Springer, 1999.

CVs:
Hermann Seuschek studied electrical engineering and information technology at Technische Universität München. Afterwards he worked for the central research and development department within the Siemens AG on topics related to applied cryptography and security for embedded systems. He left Siemens and joined the Institute for Security in Information Technology at Technische Universität München to pursue research in the field of automated side channel hardening of cryptographic algorithms.

Fabrizio De Santis studied computer engineering at Politecnico di Milano and completed his thesis at Advanced System Technology (AST) Laboratories (R&D) of STMicroelectronics. In 2011 he joined the Institute for Security in Information
Technology at Technische Universität München. In the period 2011 – 2013 he worked on the development of secure cryptographic implementations at Infineon Technologies AG in München.

Abstract:
The goal of the lecture is to present the latest achievements in Answer Set Programming (ASP). In particular, the focus of the lecture is on algorithms for solving optimization problems in ASP, that is, problems encoded by ASP programs with weak constraints. As usual in ASP, solutions of a problem instance are represented by its stable models, or answer sets. If the input program also comprises weak constraints, each of its stable model is associated with a cost determined by the unsatisfied weak constraints. Hence, weak constraints define a cost function, so that stable models of smaller cost are preferred.
The lecture overviews several algorithms for computing the most preferred, or optimal, stable models, and provides some details on core-guided algorithms, which proved to be effective on industrial instances of MaxSAT, the optimization variant of the satisfiability problem for propositional formulas. These algorithms work by iteratively checking satisfiability of a formula that is relaxed at each step by using the information provided by unsatisfiable cores, i.e., sets of weak constraints that cannot be jointly satisfied by any stable model of the input program.
The lecture is of the interest for both students visiting Logic Programming course as well as researchers of technical faculty working on declarative solving of hard problems.

Bio:
Dr. Mario Alviano received his master degree from University of Calabria in 2007 and his PhD in 2010 from the same university. Both works were distinguished by awards: the master thesis won the “Italian best thesis in Artificial Intelligence” a prize awarded by AI*IA, the Italian Association for Artificial Intelligence and PhD thesis was one among three dissertations awarded with a honorable mention by the European Coordinating Committee for Artificial Intelligence (ECCAI). Since 2011 he worked as a post doc and then as Assistant Professor at the Department of Mathematics and Computer Science, University of Calabria. The research interests of Dr. Alviano are spread throughout the field of knowledge representation and reasoning with the main focus on theoretical background and applications of answer set programming.

Abstract:

We present the novel concept of Controllable Face Privacy. Existing methods that alter face images to conceal identity inadvertently also destroy other facial attributes such as gender, race or age. This all-or-nothing approach is too harsh. Instead, we propose a flexible method that can independently control the amount of identity alteration while keeping unchanged other facial attributes. To achievethis flexibility, we apply a subspace decomposition onto our face encoding scheme, effectively decoupling facial attributes such as gender, race, age, and identity into mutually orthogonal subspaces, which in turn enables independent control of these attributes. Our method is thus useful for nuanced face de-identification, in which only facial identity is altered, but others, such gender, race and age, are retained. These altered face images protect identity privacy, and yet allow other computer vision analyses, such as gender detection, to proceed unimpeded. Controllable Face Privacy is therefore useful for reaping the benefits of surveillance cameras while preventing privacy abuse. Our proposal also permits privacy to be applied not just to identity, but also to other facial attributes as well. Furthermore, privacy-protection mechanisms, such as k-anonymity, L-diversity, and t-closeness, may be readily incorporated into our method. Extensive experiments with a commercial facial analysis software show that our alteration method is indeed effective.

Biography:

Dr. Terence Sim is an Associate Professor at the School of Computing, National University of Singapore. He teaches an undergraduate course in digital special effects, as well as a graduate course in multimedia. For research, Terence works primarily in these areas: face recognition, biometrics, and computational photography. He is also interested in computer vision problems in general, such as shape-from-shading, photometric stereo, object recognition. On the side, he dabble with some aspects of music processing, such as polyphonic music transcription. Terence also serves as President of the Pattern Recognition and Machine Intelligence Association (PREMIA), a national professional body for pattern recognition, affiliated with the International Association for Pattern Recognition (IAPR). Terence counts it a blessing and a joy to graduate from three great schools: Carnegie Mellon University, Stanford, and MIT.
Personal Website: https://www.comp.nus.edu.sg/~tsim/

In diesem Vortrag stellen wir unsere Beiträge zur Auswahl und Anwendung von Methoden der Informatik in Forschung und Lehre vor. Neben aktuellen Forschungsarbeiten im Bereich des computer-gestützten kollaborativen Lernens (CSCL) mittels Triangulation sich ergänzender Forschungsmethoden führen wir auch das fachdidaktische Konzept der Methodenausbildung an der TU Clausthal für den Übergang zwischen Bachelor- und Masterstudium ein. Dieses ist für den internationalen Charakter des Fachbereiches und die hohe Fluktuation zwischen beiden Studienabschnitten von hoher Bedeutung für die Qualität der Lehre.

Die Informatik ist ein wissenschaftliches Fachgebiet, in dem es in nur wenigen Jahrzehnten wesentliche von Schlüsselpersonen getragene Entwicklungen gab – und wohl auch weiterhin geben wird. Diese rasante Weiterentwicklung des Fachs Informatik sowie der Wandel des Erscheinungsbildes in der Öffentlichkeit legen nahe, dass sich deren Inhalte wie Prinzipien nicht einfach in unterrichtsspezifische Dosen abpacken lassen. Der Vortrag beleuchtet daher unterschiedliche Gebiete der Informatik und zeigt anhand von einigen konkreten Beispielen, wie Wissen und informatische Konzepte, die zunächst nur einigen wenigen Experten vorbehalten waren, alters- und entwicklungsstufengerecht Einzug in den Unterricht halten konnten und können.

Educational Data Mining liefert einen neuen, evidenzbasierten Beitrag zur Bildungsforschung.
Mit Methoden der Informatik und Statistik können Muster in Datenmengen erkannt werden, die andernfalls unentdeckt bleiben würden. Diese wiederum liefern – im Kontext der Informatikdidaktik angewendet – wichtige Informationen für den Informatikunterricht. Vorgestellt wird eine Forschungsmethode, die auf der automatischen Auswertung einer großen Menge von Begriffsnetzen basiert. Präsentiert werden sowohl Ergebnisse aus abgeschlossenen Studien wie auch weiterführende Forschungsfragen.
Ein zweiter zentraler Aspekt meiner Forschungstätigkeit befasst sich mit der Entwicklung und Validierung von Messinstrumenten für die Informatikdidaktik. Vorgestellt wird der Zwischenstand der aktuellen Forschung zu einem Instrument für Kontrollstrukturen.

Dem Unterrichtsfach Informatik mangelt es an standardisierter Kompetenzorientierung und den dahinterstehenden fundamentalen Ideen bzw. ändern sich diese durch Paradigmenwechsel häufig. Als Kulturtechnik kann die Informatik auch nicht isoliert betrachtet werden.
Künftige Forschungsherausforderungen sind demnach auch die Auswirkungen auf und die Anwendung in anderen Fächern. Es bedarf der Entwicklung von Unterrichtskonzepten und -werkzeugen, die moderne Informationstechnologien mit kreativen und spielerischen Ansätzen verbindet. Zudem soll untersucht werden, welche Auswirkungen der Trend weg von naturwissenschaftlichen hin zu Schulen mit sprachlich-kreativen Schwerpunkten auf das Fach Informatik hat und ob diese Entwicklung tatsächlich den Bedürfnissen der Schüler_innen gerecht wird.

Abstract: Cloning means the use of copy-paste as method in developing software artefacts. This practice has several problems, such as unnecessary increase of these artefacts, and thereby increased comprehension and change efforts, as well as potential inconsistencies. The automatic detection of clones has been a topic for research for several years now and we have made huge progress in terms of precision and recall. This led to a series of empirical analyses we have performed on the effects and the amount of cloning in code, models and requirements. We continue to investigate the effects of cloning and work on extending clone detection to functionally similar code. This talk will give insights into how clone detection works and the empirical results we have gathered.

Short CV: Stefan Wagner is full professor for software engineering at the University of Stuttgart. He holds a PhD in computer science from TU Munich, where he also worked as a post-doc. His main research interests are quality engineering, requirements engineering, agile software development and safety engineering; all tackled using empirical research.