The paper Emergence as Competitive Advantage - Engineering Tomorrow's Enterprise Software Systems by Sebastian Frischbier (DVS), Michael Gesmann (Software AG), Dirk Mayer (Software AG), Andreas Roth (SAP), and Christian Webel (Fraunhofer IESE) has been accepted to the 14th International Conference on Enterprise Information Systems (ICEIS'12).

The paper ACTrESS - Automatic Context Transformations in Event-based Software Systems by Tobias Freudenreich, Stefan Appel, Sebastian Frischbier, and Alejandro Buchmann has been accepted to this year's conference on Distributed Event-Based Systems.

We are glad to announce completion of the migration of the TUDμNet testbed federation to a new home, a Xeon E3. This will enable us to further enhance the services offered.
What's been keeping us busy in the last weeks:

• presented the overall system architecture at EWSN in Trento, Italy,
• increased the system's reliability: TUDμNet now features an improved USB infrastructure that enables much less un-programmable nodes, as well as much lower overall system downtime,
• extended the system to handle different sensor node types,
• addition of Z1 nodes to the testbed (first testbed to have these!),
• among other finer improvements.

The roadmap for the upcoming weeks includes scaling the network up at the second and third floors of the Piloty building, launching the second site at the TIZ building (which will include an impressive array of 51 gas sensors), and the connection of the third site (already deployed) at the surPLUShome. Stay tuned!

The oral exams with Prof. Buchmann and Ulrich Gräf will take place between March 22 and March 30.
Detailed Schedule

For questions regarding the exam schedule contact tiedem@dvs.tu-...

The paper Living in the Present: On-the-fly Information Processing in Scalable Web Architectures by David Eyers, Tobias Freudenreich, Alessandro Margara, Sebastian Frischbier, Peter Pietzuch and Patrick Eugster has been accepted at the 2nd International Workshop on Cloud Computing Platforms (CloudCP). CloudCP is held in conjunction with EuroSys 2012 (Bern, Switzerland).

The SPEC Research Group has awarded DVS alumnus Dr.-Ing. Kai Sachs with the SPEC Distinguished Dissertation Award 2011 for his doctoral dissertation titled "Performance Modeling and Benchmarking of Event-Based Systems".

The SPEC Distinguished Dissertation Award was established in 2011 to recognize outstanding dissertations within the scope of the SPEC Research Group in terms of scientific originality, scientific significance, practical relevance, impact, and quality of the presentation.

The Best Paper Award of the International Conference on Body Area Networks is granted to Christian Seeger, Alejandro Buchmann, and Kristof Van Laerhoven for the paper titled myHealthAssistant: A Phone-based Body Sensor Network that Captures the Wearer's Exercises throughout the Day.
 

Please visit the myHealthAssistant webpage for more information.

Die aktuellen Prüfungstermine hängen aus.
Bitte notieren, dass die Termine vom Mittwoch, 12.10, auf Freitag, den 14.10 verlegt wurden.

Title: "Handling Events in a Clinical Environment"

Time: Tuesday September 27th 2011, 2:00 pm

Location: S202 / A102
 

Abstract: In this talk, we present an approach for contextualizing an event-based decision support system for scheduling patient assessments in a hospital. Through observations of a specific workflow in a Norwegian University Hospital, we found that the clinical environment offers a number of challenges that seem under-addressed in current event-related literature.

For example: To cope with unexpected delays, patient coordinators often pursue a worst case scenario when scheduling patient assessments, leading to an underutilization of human resources and equipment when the procedure went without complications. We present a context-based decision support system for patient planning that helps the patient coordinator with taking well-informed rescheduling decisions and anticipating changes in other patients' schedules. The system uses information and events produced by medical equipment. As these events can be nondeterministic, we demonstrate how our domain specific context model can be used to contextualize events to enhance their quality and ascertain their meaning.

We are currently implementing the system and have already found that traditional approaches do not fit our perspective. Reasons for this will be given during the talk.

The talk will mainly be about representing a "version" of the real world based digital information which was not meant for the purpose that it is used for. An explanation by use of a real life use case (see above) from a hospital that indicate the need for a notion of quality, both event quality and information quality will be addressed.
 

Short Bio: After finishing his B.Eng in The Netherlands, Leendert Wienhofen started working for CognIT a.s in Oslo as a knowledge engineer in 2000. He has mostly been working on EU research projects with a focus on a combination of ontologies, semantic web related technology, mobile platforms and business processes. In 2006, he started working for SINTEF ICT, Scandinavia's largest independent research institute and continued working on projects mostly related to mobile, context aware technology. In 2009 he started working on a PhD at NTNU with the main research focus on quality in event processing technology applied in hospitals. Getting the right information to the right person at the right time has always been one of the main topics in his work
 

Organizers: Prof. A. Buchmann, Sebastian Frischbier

We are presenting a demo and a poster on this year's ACM SIGCOMM conference in Toronto, Canada. The demo An Online Gaming Testbed for Peer-to-Peer Architectures by Max Lehn, Christof Leng, Robert Rehner, Tonio Triebel, and Alejandro Buchmann shows the current state of our P2P online gaming testbed with the game Planet PI4. The poster Designing a Testbed for Large-scale Distributed Systems by Christof Leng, Max Lehn, Robert Rehner, Alejandro Buchmann discusses state-of-the-art techniques for the development and evaluation of distributed applications.

On The Performance Of Database Query Processing Algorithms On Flash Solid State Disks.

Daniel Bausch, Ilia Petrov, Alejandro Buchmann
Sixth International Workshop on Flexible Database and Information System Technology (FlexDBIST). September, 2011.

Ensuring the confidentiality and integrity of data in distributed healthcare or financial applications is challenging. Developers may introduce unintended or deliberate security flaws in different parts of an application, which may lead to the disclosure of sensitive data. While access control mechanisms and source code auditing are used in practice to avoid security flaws, security violations are nevertheless a frequent occurrence.

Instead of avoiding all security flaws, I introduce our work on providing a "safety net" to distributed applications that prevents sensitive data disclosure from happening. Our approach is to use information flow control (IFC) to track the flow of data through a complex, heterogeneous distributed application and constrain undesirable flows that could violate data protection policy. I describe our DEFCon middleware that applies the IFC model to event-based systems in Java, after adding support for strong isolation between objects to the Java runtime. In addition, I present our recent work on PHP Aspis, which uses IFC to protect PHP web applications against injection vulnerabilities.

Page Size Selection for OLTP Databases on SSD RAID Storage.

Ilia Petrov, Robert Gottstein, Todor Ivanov, Daniel Bausch, Alejandro Buchmann
In Journal of Information and Data Management,Vol.2,No 1 (2011)

Scalability is a fundamental problem in the development of computer games and massively multiplayer online games (MMOs). Players always demand more --- more polygons, more physics particles, more interesting AI behavior, more monsters, more simultaneous players and interactions, and larger virtual worlds.

Most game developers think of databases as persistence solutions, designed to store and read game state. But the advantages of database systems go way beyond persistence. Database research has dealt with the question of efficiently processing declarative languages, and the resulting research questions have touched many areas of computer science.

In this talk, I will show how the idea of declarative processing from databases can be applied to computer games and simulations. I will then discuss how we can use ideas from optimistic concurrency control to scale interactions between players in MMOs, and I will conclude by describing how we can use these techniques to build elastic transaction processing infrastructure for the cloud.

About Johannes Gehrke:

Johannes Gehrke is a Professor in the Department of Computer Science at Cornell University. Johannes' research interests are in the areas of database systems, data mining, data privacy, and applications of database and data mining technology to marketing and the sciences. Johannes has received a National Science Foundation Career Award, an Arthur P. Sloan Fellowship, an IBM Faculty Award, the Cornell College of Engineering James and Mary Tien Excellence in Teaching Award, the Cornell University Provost's Award for Distinguished Scholarship, a Humboldt Research Award, and the 2011 IEEE Computer Society Technical Achievement Award. He is the author of numerous publications on data mining and database systems, and he co-authored the undergraduate textbook Database Management Systems (McGrawHill (2002), currently in its third edition), used at universities all over the world. Johannes is also an Adjunct Associate Professor at the University of Tromsø in Norway.

The course covers the foundations of Business Intelligence and Data Warehousing from architectural, algorithmic and practical perspective. In addition it covers new trends such as Data Warehouse Appliances, Cloud Analytics, Column Stores and the use of flash memory. The course replaces its predecessor-Data Warehousing.

The lecture includes a hands-on practical exercise, in which we shall demonstrate different systems and techniques.

More information

Many of today's software systems rely on predictable and stable information flows. Due to the digitalization of the world, these flows become increasingly more complex and dynamic. Thus, tomorrow's software systems have to become more distributed and reactive. Those Distributed Reactive Software Systems (DReSS) are best realized with event-based systems.

In our new lecture we discuss state of the art research and provide hands-on experience in implementing a ready-to-use event-based system which will process real-time event data from our sensors.

Further information