Saul’yev and Group Explicit Methods

The Saul’yev methods for parabolic equations are implicit in form, but can be solved explicitly and are therefore interesting in connection with non-linear problems. Abdullah’s Group Explicit methods are parallel in nature and therefore interesting when using parallel computers. The main objective of this paper is to study the accuracy of these methods. Using global error estimation we show that for all these methods the time step must be bounded by the square of the space step size to ensure a global error which can be estimated. As a curiosity we show that the two original Saul’yev methods in fact solve two different differential equations.

On Saulyev's Methods

No abstract.

On Saulyev's Methods

In 1957 V. K. Saulyev proposed two so-called asymmetric methods for solving parabolic equations. We study these methods w.r.t. their stability and consistency, how to include first order derivative terms, how to apply boundary conditions with a derivative, and how to extend the methods to two space dimensions. We also prove that the various modifications proposed by Saulyev, Barakat and Clark, and Larkin also (as was to be expected) require k = o(h) in order to be consistent. As a curiosity we show that the two original Saulyev methods in fact solve two different differential equations.

On the stability of ADI methods

When solving parabolic equations in two space dimensions implicit methods are preferred to the explicit method because of their better stability properties. Straightforward implementation of implicit methods require time-consuming solution of large systems of linear equations, and ADI methods are preferred instead. We expect the ADI methods to inherit the stability properties of the implicit methods they are derived from, and we demonstrate that this is partly true. The Douglas-Rachford and Peaceman-Rachford methods are absolutely stable in the sense that their growth factors are ≤ 1 in absolute value. Near jump discontinuities, however, there are differences w.r.t. how the ADI methods react to the situation: do they produce oscillations and how effectively do they damp them. We demonstrate the behaviour on two simple examples.

Proceedings of Designing Self-care for Everyday Life. Workshop in conjunction with NordiCHI 2014, 27th October.

<p>Managing chronic conditions can be challenging. People in such conditions, and the people around them, have to, for example: deal with symptoms, adapt to the resulting disability, manage emotions, and change habits to keep the condition under control. Self-care technologies have the potential to support self-care, however they often disregard the complexity of the settings in which they are used and fail to become integrated in everyday life.</p><p>The present collection of papers forms the Proceedings of the Workshop “Designing Selfcare for Everyday Life” conducted last October 27th, 2014 in Helsinki, where 14 participants from 7 different countries spent the day discussing how to design self-care technologies that are in harmony with people’s everyday life. During the morning, discussions were driven by poster presentations focused on the participants’ work. In the afternoon, we engaged in a<br />participatory design exercise focused on the self-care of Parkinson’s disease. Our discussions were driven by the experience of two people living with Parkinson’s that participated in our workshop. At the end of the exercise, each group presented the different insights, concepts and problems that each patient experiences in their everyday life with the disease. Last, we all engaged in a broader discussion with a mapping exercise of issues and challenges in relation to self-care.</p><p>The contributions featured in the proceedings have been peer-reviewed by the members of the Workshop Program Committee and selected on the basis of their quality, alignment with the workshop theme, and the extent (and diversity) of their backgrounds in design. They express points of view of researchers from both Academia and Industry and provide relevant insights in the design and development use of technologies for self-care.</p><p>We want to thank all the participants and co-authors for contributing to the Workshop. We are particularly grateful to the two patients, members of the Finnish Parkinson’s Association, who accepted to participate in the workshop and enabled researchers to get a<br />perspective on the challenges of their lives. We also want to thank all the Programme Committee members for all their work during the reviewing process as well as the organisers of NordiCHI 2014 for providing useful facilities.</p>

ECSCW 2013 Adjunct Proceedings The 13th European Conference on Computer Supported Cooperative Work 21 - 25. September 2013, Paphos, Cyprus

<p>This volume presents the adjunct proceedings of ECSCW 2013.</p><p>While the proceedings published by Springer Verlag contains the core of the technical program, namely the full papers, the adjunct proceedings includes contributions on work in progress, workshops and master classes, demos and videos, the doctoral colloquium, and keynotes, thus indicating what our field may become in the future.</p>

TinyDebug: Multi-Purpose Passive Debugging Framework for Embedded Wireless Systems

<span style="font-family: CMR9; font-size: xx-small;"><span style="font-family: CMR9; font-size: xx-small;"><p>Debugging embedded wireless systems can be cumbersome</p> <p>due to low visibility. To ease the task of debugging this</p> <p>paper present TinyDebug which is a multi-purpose passive</p> <p>debugging framework for developing embedded wireless sys-</p> <p>tems. TinyDebug is designed to be used throughout the</p> <p>entire system development process, ranging from simulation</p> <p>to actual deployment. TinyDebug provides out-of-the-box</p> <p>message oriented debugging and event logging mechanism</p> <p>while enabling more advanced debugging techniques to pro-</p> <p>cess the same debug events.</p> <p>We present the TinyDebug framework with all its features</p> <p>from event logging to extraction and show how the frame-</p> <p>work improves upon existing message based and event log-</p> <p>ging debugging techniques while enabling distributed event</p> <p>processing. We also present a number of optional event anal-</p> <p>ysis tools demon</p></span></span>

ECSCW 2011 Conference Supplement: European Conference on Computer-Supported Cooperative Work Aarhus, 24.-28. September 2011

<span style="font-family: Arial; font-size: x-small;"><span style="font-family: Arial; font-size: x-small;"><p>Dual eye-tracking (DUET) is a promising methodology to study and support</p> <p>collaborative work. The method consists of simultaneously recording the gaze of two</p> <p>collaborators working on a common task. The main themes addressed in the workshop</p> <p>are eye-tracking methodology (how to translate gaze measures into descriptions of joint</p> <p>action, how to measure and model gaze alignment between collaborators, how to address</p> <p>task specificity inherent to eye-tracking data) and more generally future applications of</p> <p>dual eye-tracking in CSCW. The DUET workshop will bring together scholars who</p> <p>currently develop the approach as well as a larger audience interested in applications of</p> <p>eye-tracking in collaborative situations. The workshop format will combine paper</p> <p>presentations and discussions. The papers are available online as PDF documents at</p> <p>http://www.dualeyetracking.org/DUET2011/.</p></span></span>

Proceedings of Therapeutic Strategies A Challenge for User Involvement in Design Workshop in conjunction with NORDICHI 2010 17. October 2010, Reykjavik, Iceland

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Wii i Trige Et projekt om Wii, motivation og ældres træning.

Projektet Wii i Trige (feb.-juli 2009) blev igangsat i forbindelse med Konsortiet for Brugerdreven Sundhedsinnovations arbejde med ældre og teknologi. Undersøgelsen har haft fokus på ældres anvendelse af Nintendo Wii, samt på hvorvidt computerspil med fysisk interaktion kan motivere og bidrage til vedligeholdelsestræning og genoptræning på et lokalcenter. Projektet er gennemført af ansatte fra Lokalcenter Bjørnshøj, Datalogisk Institut og Alexandra Instituttet.<br />