Home » Lectures 2009

Lectures 2009

21 Dec 14:00 Henrik Petander: Context aware mobility on the Android platform

Dr. Henrik Petander from NICTA, Australia, will be visiting the department on Monday December 21st and will give a guest lecture at 14 in B222. If anyone is interested in meeting with him before or after the talk, please get in touch with me.

Title: Context aware mobility on the Android platform

Abstract:

Context or situational awareness has been used in various fields to build adaptive applications and systems. In this presentation I present an overview of the context aware mobility management prototype for the Android mobile phone platform that we have developed over the last three years at NICTA. The incoming context information is managed using a publish subscribe based context management system. Using this information we make handoff or network selection decisions on the energy optimal communications path. The handoffs are executed using Dual Stack Mobile IPv6. This presentation gives a more detailed view of the energy aware network selection algorithm.

Speaker bio:

Henrik Petander is a researcher in mobile communications at NICTA, in Sydney Australia. He received his PhD from Helsinki University of Technology in 2007 and his Master's degree from Helsinki University of Technology in 2002. His research interests include mobility management and content distribution in mobile networks. 

16 Dec 15:00 András Zahemszky: Beyond zFilters and MPLS

Researcher András Zahemszky (HIIT/Ericsson):

Title: "Beyond zFilters and MPLS"

Time: 16 December 2009, 15:00
Place: Spektri 3rd floor meeting room

Abstract:

Earlier work in the PSIRP project produced LIPSIN (Line speed publish/subscribe internetworking), a stateless multicast forwarding solution. In LIPSIN, links are named instead of nodes, and the link identifiers of the links the packet needs to travel through are placed in a small Bloom filter in the packet header. With this technique, unicast traffic and sparse-mode multicast can be efficiently handled. As an addition to zFilters, we proposed zFormation, where the zFilter of the packet is bound to some flow information in the packet (e.g. publication identifier in PSIRP, or the IP 5-tuple in legacy networks), to its path and to time. This way, the zFilter cannot be misused and DDoS attacks can be prevented.

Finally, our on-going work focuses on new use cases of zFilters and zFormation. By combining the advantages of the legacy packet forwarding technology MPLS, and zFilters, we are currently building a new packet forwarding architecture, zMPLS, which increases the flexibility of MPLS and promises (eg.) the enabling of scalable and bandwidth-efficient Multicast Virtual Private Network (MVPN) services.

In my presentation, I will first summarize zFilters and zFormation, then focus on presenting the details of zMPLS. As the work is still on-going, constructive feedback and discussion is more than welcome.

Welcome!

The work is related to the PSIRP project.

16 Dec 13:00 Mikael Johnson: User Involvement, Social Media, and Service Evolution: The Case of Habbo

Please join us for Mikael Johnson from National Consumer Research Centre and HIIT, who will discuss user involvement in service evolution.

Time: Wednesday 16 December at 1-2pm.

Place: Spektri Business Park, Pilotti Building, 3rd floor meeting room.
Metsänneidonkuja 4, Espoo.

Title: User Involvement, Social Media, and Service Evolution: The Case of Habbo

Abstract: Understanding user needs and involving users are key success factors for service development. However, it is unclear how to apply old wisdoms from traditional product development settings in a social media context. This article analyses user involvement practices in a longitudinal case study of the virtual world and social networking service called Habbo. The focus is on how particular social media aspects, such as persistent user-created content and developers’ easy access to online user action, shaped user involvement and how it evolved over time. In line with previous research, the findings indicate that user involvement becomes more formal as the user community grows and the service-market combination matures. In addition, user involvement regarding social media appears to be an issue of timing, trans-nationality, and governance. The results suggest that the usability practitioner’s ‘toolbox’ needs tuning regarding social media.

Bio: Mikael Johnson is researcher and web developer, working on a PhD about user involvement strategies in the design of social media, with Habbo as the case. He webmasters energychange.info - a research project that wants change in energy use and energy services.

Homepage of the Seminar:
http://www.hiit.fi/interactivecomputingseminar

15 Dec 14:15 Susan Rodger: Computer Science Concepts Come Alive

Dr. Susan Rodger from the Duke University, North Carolina, USA, will give a guest lecture on Tuesday 15th of December at 14:15-16 in Exactum, room B222.

Title

Computer Science Concepts Come Alive

Abstract

We describe how to make computer science concepts come alive through visualization and interaction in several computer science courses from introductory computer science to theoretical computer science. We discuss both software tools and props, including the following three tools. JAWAA, a scripting language, aids in creating animations of algorithms and data structures. JFLAP, a tool for automata and grammars, allows for experimentation with theoretical concepts. Alice, a virtual worlds programming environment, visualizes programming concepts in 3D that are accessible for students as young as middle school. We provide examples of how such tools aid students in understanding concepts.

Biography

Susan Rodger is a Professor of the Practice in the Computer Science Department at Duke University. She received her PhD in computer science from Purdue University. Rodger's research interests include interactive and visual software and computer science education. She developed JFLAP, a tool for experimenting with automata theory, and is a co-author of the book "JFLAP - An Interactive Formal Languages and Automata Package." JFLAP is used around the world in automata theory courses, compiler courses, and discrete math courses and was a finalist in the 2007 NEEDS Premier Award for Excellence in Engineering Education Courseware. She developed JAWAA, a scripting language for algorithm animation over the web. She has taught Alice to students from college level to middle school level, and has run Alice workshops for K-12 teachers. She is an ACM Distinguished Educator.

Dr. Rodger is in Finland as the opponent for a PhD thesis defence at HUT.

14 Dec 14:00 Daniil Ryabko: Sequence prediction for arbitrary classes of processes

Dr. Daniil Ryabko (INRIA) will be visiting Helsinki on December 14-15.
and he will be giving a guest lecture on Monday December 14th at 10:15 in room B222 of the Exactum building at the Kumpula campus.

Title:

Sequence prediction for arbitrary classes of processes

Abstract:

The problem is predicting probabilities of the next outcome of a sequence of observations, in an on-line fashion. It is assumed that the sequence is generated by some probabilistic process, whose nature is unknown, but it is assumed that this process comes from a known set C.
We try to identify the strategies for finding predictors in this general formulation, as well to answer the following simple question: for which classes C does there exist a consistent (for different notions of
consistency) predictor? One of the main results is the demonstration that when there is a consistent predictor, there is also a consistent Bayesian predictor concentrated on a countable subset of C.

More information on Daniil's work:
http://daniil.ryabko.net/

Anybody interested in having a chat with Daniil after the talk: check the calendar named "Daniil Ryabko" in the Google calendar (log in as "csvieras", password: "whoisthis"), and feel free to book a slot for a meeting (but remember to add your name, room number and email address in the event details). I will be coordinating his visit, so please also notify me email by if you add an event in the calendar.