Numero 22

fredag 6 juni 1997, årgång 27

Veckoblad om forskning, undervisning och administration m.m.
NADA - Institutionen för numerisk analys och datalogi, KTH


Aktuellt kalendarium (inte kalendariet som hör specifikt till denna Numeroutgåva).

Delfi i sommar

Fram till midsommar finns dagjour i Delfi endast på förmiddagar. Därefter bevakas endast brev till system och telefonmeddelanden till 7146. Semestrar och arbeten med andra projekt gör dock att det kan dröja längre innan man får hjälp. Viss mottagning kommer att finnas i Delfi för användarnamns- och passerkortsfrågor.


Gäst på PDC

Peter Frick from the Institute of Continuous Media Mechanics (Perm, Russia) is visiting me for the month of June. Peter has visited PDC several times since 1992. This time he is going to work on cascade models of MHD turbulence Peter will be in my office (telephone 77 84).

Erik Aurell

Högskolans ledning, lärare och organisation

Regeringens proposition om Högskolans ledning, lärare och organisation av den 16 maj 1997 finns nu hos mig.


Småreparationer under sommaren

Om Ni har trasiga stolar eller liknande, kan ni meddela mig. Jag ska försöka se till att det blir reparerat.



Nadas traditionella picknick arrangeras onsdagen den 18:e juni på borggården kl. 11.30.

Peter Carlsson

Exjobbsseminarium i datalogi

Fyra SU-studenter presenterar sina examensarbeten onsdag 11 juni, kl 14.00-16.00 i seminarierum 1537 (Osquars Backe 2, plan 5).

Abraham Oussi, matematisk-naturvetenskapliga linjens inriktning mot datavetenskap: Optimerad mobil Netscape/Amadeus. Arbetet har utförts vid Telia Promotor AB. Handledare vid Nada: Jonas Mölsä.

Jens Hovmöller, fristående kurs i datalogi: Methods and Techniques used in Free Text Search and an Evaluation of the Topic Search Engine. Arbetet har utförts vid Ericsson Data AB. Handledare vid Nada: Serafim Dahl och Kjell Lindqvist.

Matts Sjöstedt, matematisk-naturvetenskapliga linjens inriktning mot datavetenskap: Trust Manager. Arbetet har utförts vid inst. för teleinformatik, KTH. Handledare vid Nada: Johan Håstad.

Thomas Eklund, matematisk-naturvetenskapliga linjens inriktning mot datavetenskap: IP version 6: the Next Generation Internet Protocol. Arbetet har utförts vid Ericsson Radio Systems AB. Handledare vid Nada: Jonas Mölsä.


I korthet

Seminarium: The Global Engineering Network (GEN) - "turning engineering knowledge into an accessible corporate asset". 9 juni kl.14.00 i Uppsala. Numeropärmen 97.077

Seminarium: Robust Design Problems in Telecommunication Networks. Professor Michal Pioro, Teletrafiksystem, LTH, Lund. 13 juni kl. 11.00 - 12. Rum 3721, Lindstedtsvägen 25, plan 7. Numeropärmen 97.078

Seminarium: Global360 Symmetric TV on a high-speed network. 16-18 juni på SICS. Numeropärmen 97.079

Pengar: Program för hemvändande postdoktorers etablering utanför akademin. SSF. Sista ansökningsdag är den 1 oktober. Numeropärmen 97.080

Tjänster: 3 tjänster i Linköping. Professor i Datalogi. Forskarassistent i Teknisk datavetenskap. Forskarassistent med humanistisk inriktning. Sista ansökningsdag är den 20 juni. Numeropärmen 97.081

Ellemtel-exjobb på CID

Examensarbete vid CID, Centrum för användarorienterad IT-design, Nada, KTH. Detta är samarbetsprojekt mellan CID och Ellemtel. Ex-jobbare kommer att arbeta på Ellemtel men fysiskt placeras på KTH.

Masters' Thesis (Examensarbete) suggestion at Ellemtel in cooperation with CID, NADA, KTH:

Info på webben: ht- tp://


Background :

SGN/97 is a high speed network (Stockholm Gigabit Network, connecting Ericsson, Ellemtel, Telia, KTH and SICS). The requirements of the services that are available in SGN/97 are to extract the information from a high number of data sources in a very short time. The information generated from the data will be presented in a form depending on the services' requirements and the user profile. It is assumed that very high bandwidth in combination with computing power is available in SGN/97.


The thesis shall include designing an advanced high performance interface to the different services in SGN/97. The interface will serve a common access to the network for the participating projects. The thesis includes advanced filtering mechanisms for presentation of data and a user friendly graphical interface. The thesis should start with an investigation over the WWW to identify relevant input to the work.


The thesis should consider appropriate mechanisms to limit the amount of information to the user and present it in a way that is easy to perceive. Data is transmitted with Internet protocols. A requirement is that a high number of selections of information sources should be possible at a very short time. It is assumed that a mix of very high bandwidth in combination with computing power is available. Solutions how to create such mix is of interest.


The solution should recommend graphics presentation technique and filtering mechanisms. Navigation and presentation metaphors to be considered might include 2D and 3D presentations of "real" windows into the different connected sites and applications and/or planet worlds. Prototype implementations might use VRML and/or other plug-ins.

Ellemtel contact: Örjan Sahlin,

CID/NADA supervisor: Sören Lenman,

NADA examinator: Yngve Sundblad,

Michael Ortman

SANS-seminarium: Gesture Recognition Using Neural Networks

Anders Sandberg, SANS, håller seminarium under ovanstående rubrik på onsdag (11 juni) kl. 13.15-14.30 i seminarierum 4523 (Lindstedtsv. 5, plan 5).


Gesture interaction is a versatile, intuitive way of interacting with computers, especially suited for virtual environments and applications where many degrees of freedom are important. Human gestures have many meanings and uses, and are often different from person to person, while gesture input devices often introduce artifacts; this makes recognizing and interpreting gestures nontrivial. Gestures can be divided into postures, where the configuration of the hand is static, and true gestures, where the flexion of the fingers and the hand position/direction are changing dynamically. A recognition model based on a hybrid artificial neural network combining a radial basis function and a Bayesian classifier network is developed and tested with various forms of pre-processing or input representation. The results suggest that dynamic gesture recognition is feasible even for complex gestures, but that context information may be needed for reliable recognition.

Keywords: gesture recognition, artificial neural networks, radial basis functions, competitive learning, Bayesian neural networks, context sensitivity

Mikael Djurfeldt, Anders Lansner


Jack Dongarra from University of Tennessee and Oak Ridge National Laboratory and Dan Sorensen Rice University visit PDC during June-July and June respectively. Jack and Dan will give a seminar Wednesday June 11, 11.00 in room 1537. The purpose of the seminar is to find common interest between our groups.

Part 1: In this talk we will overview a number of research projects that are on going at the University of Tennessee and Oak Ridge National Laboratory in the Innovative Computing Laboratory. In particular, we will describe the software activities for the LAPACK/ScaLAPACK projects, the Netlib/NHSE activities, and the PVM/NetSolve development.

Part 2: New Approaches to Large Scale Eigenanalysis

The past few years have seen significant advances in our abilities to compute partial eigendecompositions of large matrices. These new approaches have led to critical advances in several application areas including computational chemistry, semi-conductor laser design, linear stability analysis, and reduced basis techniques for large state space control systems.

This talk will briefly introduce the capabilities of the software package ARPACK for computing a few eigenvalues and corresponding eigenvectors of large sparse (or structured) matrices. This package has been used extensively in many application areas that require the solution of large scale symmetric or nonsymmetric (generalized) eigenvalue problems. Typically, k eigenvalues with user specified properties are computed in space proportional to n*k, where n is the order of the matrix.

Gert Svensson

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