Lukin, V., Zriakhov, M., Zelensky, A. A., Egiazarian, K. & Värri, A. 2008.
Lossy compression of multichannel ECG based on 2-D DCT and pre-processing.
Proceedings of the International Conference TCSET'2008, Modern Problems of
Radio Engineering, Telecommunications and Computer Science, Lviv-Slavsko,
Ukraine, 19-23 February 2008 pp. 159-162.
Virkkala, J., Velin, R., Lapveteläinen, N., Himanen, N., Värri, A.,
Sallinen, M., Härmä, M. & Hasan, J. 2008. Visual and semi-automatic sleep
stage scoring using only electro-oculography. SLEEP 2008, 22nd Annual
Meeting of the Associated Professional Sleep Societies, LLC, Valtimore,
Maryland, USA, 7-12 June 2008. Sleep, Journal of Sleep and Sleep Disorders
Research 31 p. A333.
Akhbardeh, A., Junnila, S., Koivistoinen, T. & Värri, A. 2007. An
intelligent ballistocardiographic chair using a novel SF-ART neural network
and biorthogonal wavelets. Journal of Medical Systems 31 1, pp. 69-77.
Akhbardeh, A., Junnila, S., Koivuluoma, M., Koivistoinen, T., Turjanmaa,
V., Kööbi, T. & Värri, A. 2007. Towards a heart disease diagnosing system
based on force sensistive chair's measurement, biorthogonal wavelets and
neural networks. Engineering Application of Artificial Intelligence 20 4,
pp. 493-502.
Akhbardeh, A., Junnila, S., Koivuluoma, M., Koivistoinen, T. & Värri, A.
2007. Applying novel time-frequency moments singular value decomposition
method and artificial neural networks for ballistocardiography. Eurasip
Journal on Advances in Signal Processing 2007 9 p.
Alametsä, J., Värri, A. & Palomäki, A. 2007. Long term follow-up of
ballistocardiography. In: Häyrinen, K. (ed.). Sosiaali- ja terveydenhuollon
tietotekniikan ja tiedonhallinnan tutkimuspäivät, Turku, Finland, 30-31 May
2007. Stakesin työpapereita 14/2007 5 p.
Barna, L., Dougherty, J., Astola, J. & Värri, A. 2007. Estimation of
respiratory rate with the ballistocardiographic chair. Tampere University
of Technology, Institute of Signal Processing, Report Tampere. 2, 5 p.
Barna, L., Koivuluoma, M., Hasu, M., Tuppurainen, J. & Värri, A. 2007. The
use of electromechanical film (EMFi) sensors in building a robust
touch-sensitive tablet-like interface. IEEE Sensors Journal 7 1, pp. 74-80.
Huupponen, E., Gomez-Herrero, G., Saastamoinen, A., Värri, A., Hasan, J. &
Himanen, S-L. 2007. Development and comparison of four sleep spindle
detection methods. Artificial Intelligence in Medicine 40 Elsevier B.V.. 3,
pp. 157-170.
Koivuluoma, M. & Värri. A. 2007. Data mining of the SIESTA polygraphic
sleep recording database. Abstracts of the 5th Nordic Neuroinformatics
Workshop, Espoo, Finland, 27 October 2007 p. 21.
Saastamoinen, A., Huupponen, E., Värri, A., Hasan, J. & Himanen, S.-L. 2007.
Systematic performance evaluation of a continuous-scale sleep depth
measure. Medical Engineering & Physics 29 10, pp. 1119-1131.
Värri, A. 2007. CEN/TC251/ENV FEF14271 review. Joint Meeting of ISO/TC215 -
Health Informatics, WG7 - Devices, CEN/TC251 WGIV - Devices, IEEE EMBS
11073, and HL7 Health Care Devices (DEV) SIG, Cologne, Germany, 7 april
2007.
Värri, A. 2007. Long way to a global standard format for digitized
biosignals. Proceedings of the 2nd International Symposium on Medical
Information and Communication Technology, ISMICT'07, Oulu, Finland, 11-13
December 2007 2 p.
Värri, A. 2007. Mittaava tuoli. IX HYVITE Symposium, Istumisen haasteet,
Tampere, Finland, 22 November 2007 26 p.
Virkkala, J., Hasan, J., Värri, A., Himanen, S.-L. & Härmä, M. 2007. The
use of two-channel electro-oculography in automatic detection of
unintentional sleep onset. Journal of Neuroscience Methods 163 Elsevier. 1,
pp. 137-144.
Virkkala, J., Hasan, J., Värri, A., Himanen, S-L. & Müller, K. 2007.
Automatic detection of slow wave sleep using two channel
electro-oculography. Journal of Neuroscience Methods 160 Elsevier. 1, pp.
171-177.
Virkkala, J., Hasan, J., Värri, A., Himanen, S.-L. & Muller, K. 2007.
Automatic estimation of wakefulness and sleep using electro-oculography.
Proceedings of SENSATION 2nd International Conference, Monitoring sleep and
sleepiness with new sensors within medical and industrial applications,
Chania, Greece, 3-5 June 2007 5 p.
Virkkala, J., Hasan, J., Värri, A., Himanen, S-L. & Müller, K. 2007.
Automatic sleep stage classification using two-channel electro-oculography.
Journal of Neuroscience Methods 166 Elsevier. 1, pp. 109-115.
Virkkala, J., Hasan, J., Värri, A., Himanen, S. & Muller, K. 2007.
Automatic 24h estimation of wakefulness and sleep using electro-oculography.
SLEEP 2007, 21st Annual Meeting of the Associated Professional Sleep
Societies, LLC, Minneapolis, Minnesota, 9-14 June 2007. Sleep, Journal of
Sleep and Sleep Disorders Research 30 p. A341.
Virkkala, J., Hasan, J., Värri, A., Huupponen, E., Himanen, S.-L. & Muller,
K. 2007. Reducing the effects of electrocardiographic artifacts on
electro-oculography in automatic sleep analysis. Proceedings of the 29th
Annual International Conference of the IEEE Engineering in Medicine and
Biology Society, EMBC 2007, Lyon, France, 23-26 August 2007 pp. 590-593.
Akhbardeh, A., Junnila, S., Koivistoinen, T. & Värri, A. 2006. Applying
novel supervised fuzzy adaptive resonance theory (SF-ART) network and
biorthogonal wavelets for ballistocardiogram diagnosis. Proceedings of the
2006 IEEE International Symposium on Intelligent Control , ISIC, Munich,
Germany, 4-6 October 2006 pp. 143-148.
Akhbardeh, A., Junnila, S., Koivistoinen, T. & Värri, A. 2006. Design an
intelligent ballistocardiographic chair using novel quicklearn and SF-SRT
algorithms and biorthogonal wavelets. Proceedings of 2006 IEEE
International Conference on Systems, Man, and Cybernetics, SMC 2006,
Taipei, Taiwan, 8-11 October 2006 pp. 878-883.
Akhbardeh, A., Junnila, S. & Värri, A. 2006. Applying biorthogonal wavelets
and a novel quicklearn algorithm for an intelligent ballistocardographic
chair. Proceedings of 2006 IEEE Mountain Workshop on Adaptive and Learning
Systems, SMCals, Logan, Utah, USA, 24-26 July 2006 pp. 42-47.
Akhbardeh, A. & Värri, A. 2006. Applying novel quicklearn algorithm for
pattern recognition. Proceedings of 2006 IEEE Conference on Systems, Man,
and Cybernetics, SMC, Taipei, Taiwan, 8-11 October 2006 pp. 851-855.
Akhbardeh, A. & Värri, A. 2006. QuickLearn- a novel supervised on-line
learning algorithm for pattern recognition. Proceedings of 2006 IEEE
Mountain Workshop on Adaptive and Learning Systems, SMCals, Logan, Utah,
USA, 24-26 July 2006 pp. 207-212.
Alametsä, J., Rauhala, E., Huupponen, E., Saastamoinen, A., Värri, A.,
Joutsen, A., Hasan, J. & Himanen, S-L. 2006. Automatic detection of spiking
events in EMFi sheet during sleep. Medical Engineering & Physics 28 3, pp.
267-275.
Alametsä, J., Saastamoinen, A., Huupponen, E., Värri, A., Joutsen, A.,
Hasan, J., Rauhala, E. & Himanen, S-L. 2006. Prolonged spiking periods
pattern detection method by using EMFit and SCSB signals. In: Hyvönen, E.
et al. (eds.). Proceedings of the 12th Finnish Artificial Intelligence
Conference STeP 2006, Espoo, Finland, 26-27 October 2006 pp. 75-81.
Barna, L. C., Koivuluoma, M., Vlad, M. & Värri, A. 2006. Multichannel
signal measurement and display. In: Jan, J. et al. (eds.). Proceedings of
the 18th Biennial International Eurasip Conference, Biosignal 2006, Brno,
Czech Republic, 28-30 June 2006 pp. 143-145.
Barna, L., Koivuluoma, M., Micheloyannis, S., Zervakis, M. & Värri, A. 2006.
Spectral analysis for the differentiation between normal and mild
epileptic children. Proceedings of The International Special Topic
Conference on Information Technology in biomedicine, ITAB 2006, Ioannina,
Greece, 26-28 October 2006 5 p.
Huupponen, E., De Clercq, W., Gomez-Herrero, G., Saastamoinen, A.,
Egiazarian, K., Värri, A., Vanrumste, B., Vergult, A., Van Huffel, S., Van
Paesschen, W., Hasan, J. & Himanen, S-L. 2006. Determination of dominant
simulated spindle frequency with different methods. Journal of Neuroscience
Methods 156 Elsevier. 1-2, pp. 275-283.
Huupponen, E., Saastamoinen, A., Eskelinen, V., Värri, A., Hasan, J. &
Himanen, S-L. 2006. Apnea patients show a frontopolar inter-hemispheric
spindle frequency difference. Neuroscience Letters 403 1-2, pp. 186-189.
Junnila, S., Akhbardeh, A., Barna, L. C., Defee, I. & Värri, A. 2006. A
wireless ballistocardiographic chair. Proceedings of the 28th Annual
International Conference of the IEEE Engineering in Medicine and Biology
Society, EMBC, New York City, USA, August 30 - September 3, 2006 pp.
5932-5935.
Saastamoinen, A., Huupponen, E., Värri, A., Hasan, J. & Himanen, S.-L. 2006.
Computer program for automated sleep depth estimation. Computer Methods
and Programs in Biomedicine 82 1, pp. 58-66.
Saastamoinen, A., Oja, H., Huupponen, E., Värri, A., Hasan, J. & Himanen,
S-L. 2006. Topographic differences in mean computational sleep depth
between healthy controls and obstructive sleep apnoea patients. Journal of
Neuroscience Methods 157 Elsevier. 1, pp.178-184.
Sun, L., Hu, P., Goh, C., Hamadicharef, B., Hess, M., Ifeachor, E.,
Barbounakis, I., Zervakis, M., Nurminen, N. & Värri, A. 2006. Bioprofiling
over Grid for early detection of dementia. Proceedigs of the First
International Conference on Scalable Information systems, INFOSCALE 2006,
Hong Kong, 29 May - 1 June 2006. ACM International Conference Proceedings
Series 152 ACM. 10 p.
Värri, A. 2006. Digitaalinen tallennus (biosignaalit). Tietojärjestelmien
Integraatio, Kuopion yliopiston Kesäkoulu 2006, Kuopio, Finland, 17-18
August 2006 30 s.
Värri, A. 2006. File exchange format for vital signs, ENV 14271 and its use
in electronic interchange of polysomnography data. Workshop to Develop
Guidelines for Electronic Interchange of Polysomnography Data,
Philadelphia, PA, USA, 27 January 2006 27 p.
Virkkala, J., Hasan, J., Värri, A., Himanen, S-L. & Härmä, M. 2006.
Automatic unintentional sleep onset detection using two channel
electro-oculography. Nordic Congress of Clinical Neurophysiology, NCCN
2006, Helsinki, Finland, 21-24 May 2006 pp. 83.
Virkkala, J., Hasan, J., Värri, A., Himanen, S. & Müller, K. 2006.
Automatic sleep scoring system using two channel electro-oculorgraphy.
Abstracts of the 18th Congress of the European Sleep Research Society,
Innsbruck, Austria, 12-16 September 2006. Journal of Sleep Research 15 s1,
p. 169.
Akhbardeh, A., Junnila, S., Koivistoinen, T., Kööbi, T. & Värri, A. 2005.
Ballistocardiogram classification using a novel transform so-called AliMap
and biorthogonal wavelets. Proceedings of IEEE International Symposium on
Intelligent Signal Processing, WISP 2005, University of Algarve, Portugal,
1-3 September 2005 6 p.
Akhbardeh, A., Junnila, S., Koivuluoma, M., Koivistoinen, T. & Värri, A.
2005. Evaluation of heart condition based on ballistocardiogram
classification using compactly supported wavelet transforms and neural
networks. Proceedings of the 2005 IEEE Conference on Control Applications,
Toronto, Canada, 29-31 August 2005 pp. 843-848.
Akhbardeh, A., Junnila, S., Koivuluoma, M., Koivistoinen, T. & Värri, A.
2005. The heart disease diagnosing system based on force sensitive chair's
measurement, biorthogonal wavelets and neural networks. Proceedings of the
2005 IEEE/ASME International Conference on Advanced Intelligent
Mechatorinis, AIM 2005, Monterey, California, USA, 24-28 July 2005 pp.
676-681.
Akhbardeh, A., Koivuluoma, M., Koivistoinen, T. & Värri, A. 2005.
Ballistocardiogram diagnosis using neural networks and shift-invariant
daubechies wavelet transform. Proceedings of 13. European Signal Processing
Conference, EUSIPCO, Antalya, Turkey, 4-8 September 2005 4 p.
Akhbardeh, A., Koivuluoma, M., Koivistoinen, T. & Värri, A. 2005. BCG data
clustering using new method so-called time-frequency moments singular value
decomposition (TFM-SVD) and artificial neural networks. Proceedings of the
2005 IEEE International Symposium on Intelligent Control and 2005
Mediterranean Conference on Control and Automation, Limassol, Cyprus, 27-29
June 2005 pp. 1447-1451.
Akhbardeh, A., Koivuluoma, M., Koivistoinen, T. & Värri, A. 2005. BCG data
discrimination using daubechies compactly supported wavelet transform and
neural networks towards heart disease diagnosing. Proceedings of the 2005
IEEE International Symposium on Intelligent Control and 2005 Mediterranean
Conference on Control and Automation, Limassol, Cyprus, 27-29 June 2005 pp.
1452-1457.
Akhbardeh, A. & Värri, A. 2005. Novel supervised fuzzy adaptive resonance
theory (SF-ART) neural network for pattern recognition. Proceedings of IEEE
International Symposium on Intelligent Signal Processing, WISP 2005,
University of Algarve, Portugal, 1-3 September 2005 6 p.
Alametsä, J. J., Saastamoinen, A. J., Huupponen, E. J., Värri, A. O.,
Joutsen, A., S., Hasan, J., Rauhala, E. R. & Himanen, S-L. J. 2005.
Comparison of temporal and spectral properties of EMFi and SCSB signals.
In: Hamza, M. H. (Ed.). Proceedings of the Third IASTED International
Conference on Biomedical Engineering, Innsbruck, Austria, 16-18 February
2005 pp. 379-382.
Alametsä, J., Saastamoinen, A., Huupponen, E. & Värri, A. 2005. Effect on
sauna bath to BCG, carotid and ankle pulse signal during normal blood
pressure and hypertension. Proceedings of the 3rd European Medical &
Biomedical Engineering Conference, IFMBE European Conference on Biomedical
Engineering, EMBEC 2005, Prague, Czech Republic, 20-25 November 2005 11 5 p.
Alametsä, J., Saastamoinen, A. J., Huupponen, E. & Värri, A. 2005. Spectral
properties of BCG signal in sitting and lying positions in normal blood
pressure and hypertension. Proceedings of the 3rd European Medical &
Biomedical Engineering Conference, IFMBE European Conference on Biomedical
Engineering, EMBEC 2005, Prague, Czech Republic, 20-25 November 2005 11 6 p.
Barna, L. C., Koivuluoma, M. & Värri, A. 2005. Heart-rate detection using
EMFi sensors on a normal looking chair. Proceedings of the 3rd European
Medical & Biomedical Engineering Conference, IFMBE European Conference on
Biomedical Engineering, EMBEC 2005, Prague, Czech Republic, 20-25 November
2005 11 5 p.
Gomez Herrero, G., Huupponen, E., Värri, A., Egiazarian, K., Vanrumste, B.,
Vergult, A., De Clercq, W., Van Huffel, S. & Van Paesschen, W. 2005.
Independent component analysis of single trial evoked brain reponses: is it
reliable?. In: Fonseca, J. M. (Ed.). Proceedings of the 2nd International
conference on Computational Inteeligence in Medical and Healthcare, CIMED
2005, Costa da Caparica, Portugal, 29 June - 1 July 2005 pp. 69-76.
Huupponen, E., Gomez Herrero, G., Egiazarian, K., Saastamoinen, A., Värri,
A., Vanrumste, B., Vergult, A., De Clercq, W., Van Huffel, S. & Van
Paesschen, W. 2005. Bioprofile on sleep. In: Fonseca, J. M. (Ed.).
Proceedings of the 2nd International conference on Computational
Inteeligence in Medical and Healthcare, CIMED 2005, Costa da Caparica,
Portugal, 29 June - 1 July 2005 pp. 30-36.
Huupponen,E., Gomez Herrero, G., Saastamoinen, A., Egiazarian, K., Värri
A., Vanrumste, B., Vergult, A., de Clercq, W., van Huffel, S., van
Paesschen, W., Hasan, J. & Himanen, S-L. 2005. Dictionaries of waveforms
for frequency analysis of simulated spindles. In: Fonseca, J. M. (Ed.).
Proceedings of the 2nd International conference on Computational
Inteeligence in Medical and Healthcare, CIMED 2005, Costa da Caparica,
Portugal, 29 June - 1 July 2005 pp. 348-354.
Huupponen, E. J., Saastamoinen, A. J., Hasan, J., Värri, A. O. & Himanen,
S-L. J. 2005. EEG sleep spindle frequency differs between pure and diffuse
spindles. In: Hamza, M. H. (Ed.). Proceedings of the Third IASTED
International Conference on Biomedical Engineering, Innsbruck, Austria,
16-18 February 2005 pp. 387-391.
Huupponen, E. J., Saastamoinen, A. J., Virkkala, J. T., Himanen, S-L. J.,
Hasan, J. & Värri, A. O. 2005. Determination of EEG sleep spindle frequency
with DFT matching pursuit approaches. In: Hamza, M. H. (Ed.). Proceedings
of the Third IASTED International Conference on Biomedical Engineering,
Innsbruck, Austria, 16-18 February 2005 pp. 383-386.
Huupponen, E., Saastamoinen, A., Joutsen, A., Virkkala, J., Alametsä, J.,
Hasan, J., Värri, A. & Himanen, S-L. 2005. Anteroposterior difference in
EEG sleep depth measure is reduced in apnea patients. Journal of Medical
Systems 29 5, pp. 527-538.
Huupponen, E., Saastamoinen, A., Niemi, J., Virkkala, J., Hasan, J., Värri,
A. & Himanen, S-L. 2005. Automated frequency analysis of synchronous and
diffuse sleep spindles. Neuropsychobiology 51 4, pp. 256-264.
Huupponen, E., Saastamoinen, A. & Värri, A. 2005. Sleep spindles in sleep
bio-profiling. In: Lehenkari, J. & Häyrinen, K. (Eds.). SoTeTiTe 2005,
Sosiaali- ja terveydenhuollon tietotekniikan ja tiedonhallinnan
tutkimuspäivät, Osaavien keskusten verkoston julkaisuja 4 pp. 10-14.
Junnila, S., Akhbardeh, A., Värri, A. & Koivistoinen, T. 2005. An EMFi-film
sensor based ballistocardiographic chair: performance and cycle extraction
method. Proceedings of 2005 IEEE Workshop on Signal Processing Systems,
Design and Implementation, SiPS 2005, Athens, Greece, 2-4 November 2005 pp.
373-377.
Popescu, C., Barna, L. C., Koivuluoma, M. & Värri, A. 2005. Histogram based
quantification of submental EMG. Proceedings of the 3rd European Medical &
Biomedical Engineering Conference, IFMBE European Conference on Biomedical
Engineering, EMBEC 2005, Prague, Czech Republic, 20-25 November 2005 11 5 p.
Alametsä, J., Huupponen, E., Saastamoinen, A., Värri, A., Joutsen, A.,
Hasan, J., Rauhala, E. & Himanen, S.-L. 2004. New spiking detection
algorithm in sleep study. In: Sarantao, K. & Häyrinen, K. (eds.). SoTeTiTe
2004, Sosiaali- ja terveydenhuollon tietotekniikan ja tiedonhallinnan
tutkimuspäivät, Osaavien keskusten verkoston julkaisuja 4/2004, s. 5-7.
Alametsä, J., Värri, A., Koivuluoma, M. & Barna, L. 2004. The potential of
EMFi sensors in herat activity monitoring. In: Zyvietz, C. (ed.).
Proceedings of the 2nd OpenECG Workshop: Integration of the ECG into the
EHR & Interoperability of ECG Device Systems, Berlin, Germany, 1-3 April
2004 s. 81-85.
Huupponen, E., Himanen, S-L., Hasan, J. & Värri, A. 2004. Automatic
quantification of light sleep shows differences between apnea patients and
healthy subjects. International Journal of Psychophysiology 51 3, pp.
223-230.
Junnila, S., Barna, L., Koivistoinen, T., Koivuluoma, M., Alametsä, J.,
Kööbi, T., Turjanmaa, V., Niittylahti, J. & Värri, A. 2004. Development of
a wireless proactive ballistocardiograph chair. In: Linden, G. (ed.).
Proceedings of the Proactive Computing Workshop PROW 2004, Helsinki,
Finland, 25-26 November 2004 pp. 25 - 28.
Junnila, S., Koivistoinen, T., Kööbi, T., Niittylahti, J. & Värri, A. 2004.
A simple method for measuring and recording ballistocardiogram. In: Jan,
J., Kozumplik, J. & Provanznik, I. (eds.). Analysis of Biomedical Signals
and Images, Proceedings of 17th Biennial International EURASIP Conference
Biosignal 2004, Brno, Czech Republic, 23-25 June 2004 s. 232-234.
Koivistoinen, T., Barna, L., Alametsä, J., Junnila, S., Koivuluoma, M.,
Kööbi, T., Turjanmaa, V. & Värri, A. 2004. Ballistocardiograms from young
adults in sitting position using EMFi sensors. Proceedings of the 31st
Annual Meeting of Computers in Cardiology 2004, Chicago, Illinois, USA,
19-22 September 2004 5 p.
Koivistoinen, T., Junnila, S., Värri, A. & Kööbi, T. 2004. A new method for
measuring the ballistocardiogram using EMFi sensors in a normal chair.
Proceedings of the 26th Annual Internatioal Conference of the IEEE
Engineering in Medicine and Biology society, San Francisco, California,
USA, 1-5 September 2004 4 p.
Koivistoinen, T., Junnila, S., Värri, A. & Kööbi, T. 2004. Hemodynamic
parameters compared to ballistocardiogram recorded in the sitting position.
In: Linden, G. (ed.). Proceedings of the Proactive Computing Workshop PROW
2004, Helsinki, Finland, 25-26 November 2004 pp. 47-49.
Koivuluoma, M., Barna, L. C., Alametsä, J. & Värri, A. 2004. Signal
processing in ProHeMon project: objectives and first results. In: Linden,
G. (ed.). Proceedings of the Proactive Computing Workshop PROW 2004,
Helsinki, Finland, 25-26 November 2004 pp. 55-58.
Koivuluoma, M., Barna, L., Koivistoinen, T., Alametsä, J., Junnila, S.,
Turjanmaa, V., Kööpi, E. & Värri, A. 2004. ProHeMon-projekti. In: Sarantao,
K. & Häyrinen, K. (eds.). SoTeTiTe 2004, Sosiaali- ja terveydenhuollon
tietotekniikan ja tiedonhallinnan tutkimuspäivät, Osaavien keskusten
verkoston julkaisuja 4/2004, s. 37-39.
Paiva, T., Penzel, T., Zulley, J., Binnie, C., Russel, M., Escourrou, P.,
Araujo, M. T., Fred, A., Värri, A., Spreng, M., Nielsen, K., Belo, C.,
rosa, A. & Guilleminault, C. 2004. The ENN project - a telematics
experience in neurology. Somnologie, Sleep Research and Sleep Medicine 8 1,
s. 3-13.
Värri, A. 2004. ENV 14271, file exchange format for vital signs and its use
in digital ECG archiving. In: Zyvietz, C. (ed.). Proceedings of the 2nd
OpenECG Workshop: Integration of the ECG into the EHR & Interoperability of
ECG Device Systems, Berlin, Germany, 1-3 April 2004 s. 27-28.
Värri, A., Koivuluoma, M., Alametsä, J. & Ruotsalainen, U. 2004. Laitteisto
elintoimintojen mittaamiseksi. Hyödyllisyysmalli FI 6295 26 s.
Alametsä, J., Huupponen, E., Koivuluoma, M., Barna, L. & Värri, A. 2003.
Testing a new sensor for the analysis of breathing and heart rate. Sleep
Medicine, Abstract Book, 7th World Congress on Sleep Apnea, Helsinki,
Finland, June 29th - July 3rd, 2003 4 S1, s. 1.
Alametsä, J., Huupponen, E. & Värri, A. 2003. The usage of MXA2500U
acceleration sensor in heart research. In: Huttunen, H., Gotchev, A. &
Vasilache, A. (eds.), Proceedings of the 2003 Finnish Signal Processing
Symposium, FINSIG'03, Tampere, Finland, 19 May 2003 TICSP. 20, s. 22-26.
Huupponen, E., Himanen, S.-L., Hasan, J. & Värri, A. 2003. Automatic
analysis of electro-encephalogram sleep spindle frequency throughout the
night. Medical & Biological Engineering & Computing 41 6, s. 727-732.
Huupponen, E., Himanen, S-L., Hasan, J. & Värri, A. 2003. Automatic
analysis shows a difference in sleep depth of healthy controls and apnea
patients. Sleep Medicine, Abstract Book, 7th World Congress on Sleep Apnea,
Helsinki, Finland, June 29th - July 3rd, 2003 4 S1, s. 22.
Huupponen, E., Himanen, S-L., Hasan, J. & Värri, A. 2003. Decomposition of
sleep cyclisities by median filtering. Proceedings of 2003 IEEE - Eurasip
Workshop on Nonlinear Signal and Image Processing, NSIP 2003,
Grado-Trieste, Italy, 8-11 June 2003 4 s.
Huupponen, E., Himanen, S-L., Hasan, J. & Värri, A. 2003. Sleep depth
oscillations: an aspect to consider in automatic sleep analysis. Journal of
Medical Systems 27 4, s. 337-345.
Huupponen, E., Saastamoinen, A., Alametsä, J., Himanen, S-L. & Värri, A.
2003. Automatic analysis shows a difference in sleep depth of healthy
controls and apnea patients. 1st Nordic Workshop on Brain Imaging and
Neuroinformatics, Abstracts, Finn-Medi Building, Tampere, Finland, 2
October 2003 1 s.
Värri, A., Penzel, T., Jacobi, P., Cunha, J., Zywietz, C & Brown, N. 2003.
An European biosignal data format prestandard. 1st Nordic Workshop on Brain
Imaging and Neuroinformatics, Abstracts, Finn-Medi Building, Tampere,
Finland, 2 October 2003 1 s.
Huupponen, E., Himanen, S-L., Värri, A., Hasan, J., Lehtokangas, M. &
Saarinen, J. 2002. A study on gender and age differences in sleep spindles.
Neuropsychobiology 45, s. 99-105.
Huupponen, E., Himanen, S-L., Värri, A., Hasan, J., Saastamoinen, A.,
Lehtokangas, M. & Saarinen, J. 2002. Fuzzy detection of EEG alpha without
amplitude thresholding. Artificial Intelligence in Medicine 24, s. 133-147.
Koivuluoma, M., Alametsä, J. & Värri, A. 2002. Adxl202 kiihtyvyysanturin
käyttö sydäntutkimuksessa. In: Nykänen, P. (eds)., SoTeTiTe 2002 Sosiaali-
ja terveydenhuollon tietotekniikan ja tiedonhallinnan tutkimuspäivät,
Tutkimuspaperit Helsinki. Stakes. 3, s. 73-80.
Koivuluoma, M., Alametsä, J. & Värri, A. 2002. Using ADXL202 acceleration
sensor in heart research. Proceedings of 12th Nordic-Baltic Conference on
Biomedical Engineering, Reykjavik, Island, June 18-22, 2002 s. 122-125.
Alametsä, J., Koivuluoma, M. & Värri, A. 2001. Mobile physiological signal
measurement station. Proceedings of the International Federation of Medical
& Biogical Engineering. IX Mediterranean Conference on Medical and
Biological Engineering and Computing. Medicon 2001, June 12 - 15, 2001,
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Hasan, J., Peter, JH., Kinnari, K., Pietarinen, A., Grote, A., Penzel, T.,
Värri, A., Laippala, P., Saastamoinen, A. & Cassel, W. 2001. Vigilance
analysis with short segments. Somnologie Schlafforschung und Schlafmedizin
Somnology Sleep Research and Sleep Medicine International Symposium on
Sleep and Autonomous Function 20th Anniversary of the Marburg Sleep Lab
Marburg March 29 - 31 , 2001 Chair Persons: J.H. Peter, T. Penzel
Organisation: B. Knobi Abst. 8.
Huupponen, E., Himanen, S.-L., Värri, A., Hasan, J., Lehtokangas, M. &
Saarinen, J. 2001. Improving reliability in sleep spindle detection. In:
Hamza, M.H. (ed). Proceedings of the IASTED International Conference on
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Huupponen, E., Koivuluoma, M. & Värri, A. 2001. Erilaisten menetelmien
vertailu NREM-unen kvantifoinnissa. Sosiaali- ja terveydenhuollon
tietotekniikan ja tiedonhallinnan tutkimuksen päivät 4 s.
Huupponen, E., Koivuluoma, M. & Värri, A. 2001. Quantification of the nrem
sleep process with linear and non-linear features. In: Renfors, M. (ed).,
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Wireless Communications Workshop, 23-1-24 October 2001, Tampere, Finland 2 s.
Huupponen, E., Lehtokangas, M., Saarinen, J., Värri, A., Saastamoinen, A.,
Himanen, S-L. & Hasan, J. 2001. EEG Alpha Activity Detection by Fuzzy
Reasoning. Proceedings of Joint 9th IFSA World Congress and 20th NAFIPS
International Conference, July 25-28, 2001, Vancouver, British Columbia,
Canada s. 411-416.
Huupponen, E., Värri, A., Himanen, S.-L., Hasan, J., Lehtokangas, M. &
Saarinen, J. 2001. Optimization of sigma amplitude threshold in sleep
spindle detection. J. Sleep Res. s. 327-334.
Klösch, G., Kemp, B., Penzel, T., Schlög, A., Rappelsberger, P., Trenker,
E., Gruber, G., Zeithofer, J., Saletu, B., Herrmann, W. M., Himanen, S. L.,
Kunz, D., Barbanoj, M. J., Röschke, J. Värri, A. & Dorffner, G. 2001. The
SIESTA Project Polygraphic and Clinical Database. IEEE Engineering in
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Koivuluoma, M., Alametsä, J. & Värri, A. 2001. EMFi as a physiological
signal sensor, first results. In: Renfors, M. (ed)., Proceedings of URSI
XXVI Convention on Radio Science and Second Finnish Wireless Communications
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Koivuluoma, M., Huupponen, E., Värri, A., Olejarczyk, E. & Klonowski, W.
2001. Comparison of some linear and non-linear methods in the
quantification of nrem sleep process. NOLTA 2001, 2001 International
Symposium on Nonlinear Theory and its Applications, The 7th R.I.E.C.
Internantional Symposium, October 28 - November 1 2001, Miyagi Zao Royal
Hotel, Miyagi, Japan 2 s. 411-414.
Penzel, T., Kemp, B., Klösch, G., Schlögl, A., Hasan, J., Värri, A. &
Korhonen, I. 2001. Acquisition of Biomedical Signals Databases. IEEE
Engineering in Medicine and Biology Magazine 20 3, s. 25-32.
Rappelsberger, P., Trenker, E., Rothmann, Ch., Gruber, G., Sykacek,
P.,Roberts, ST., Klöch, G., Zeitlhofer, J., Anderer,, P., Saletu, B.,
Schlögl, A.Värri, A., Kemp, B.,Penzel, Th., Herrmann, W., Hasan, J.,
Barbanoj, J., Röschke, J., Kunz, D. & Dorffner, G. 2001. Das Projekt SIESTA.
Klinische Neurophysiologie, Zeitschrift für Funktionsdiagnostik des
Nervensystems 32, s. 76-88.
Saastamoinen, A., Lehtokangas, M., Värri, A. & Saarinen, J. 2001.
Biomedical Applications of Radial Basis Function Networks. In: Howlett, R.
et al. (eds.). Radial Basis Function Networks 2; New Advances in Design
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Värri, A. 2001. Uusi biosignaalien tallennusformaatti. Sosiaali- ja
terveydenhuollon tietotekniikan ja tiedonhallinnan tutkimuksen päivät s. 1-4.
Värri, A., Kemp, B., Penzel, T. & Schlägl, A. 2001. Standards for
Biomedical Signal Databases. IEEE Engineering in Medicine and Biology
Magazine 20 3, s. 33-37.
Värri, A., Koivuluoma, M. & Morvan C. 2001. A Computer-assisted visual
sleep scoring program. In: Paiva, T. Penzel, T. (eds). European
Neurological Network IOS Press. s. 285-297.
Dorfner, G., Sykacek, P., Roberts, S., Schlögl, A., Värri, A.,
Rappelsberger, P., Anderer, P., Klösh, G., Saletu, B., Barbanoj, M.J.,
Herrmann, W., Himanen, S.-L., Kemp, B., Penzel, T. & Röschke, J. 2000.
Continuous Sleep Process and Subjective Sleep Quality - First results from
the Siesta project. Journal of Sleep Research, 15th Congress fo the
European Sleep Research Society P 110,
Härmä, M., Sallinen, M., Stenberg, T., Hublin, C., Telakivi T., Värri, A. &
Partinen, M. 2000. Vireyden ja toimintakyvyn ylläpito tietointensiivisessä
työssä. Työ ja ihminen, työympäristötutkimuksen aikakauskirja 14 2, s. 161-
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Huupponen, E., Himanen, S-L., Värri, A., Hasan, J., Lehtokangas, M. &
Saarinen, J. 2000. Effect of visual scorings on development of automated
methdos for sleep EEG analysis. Terveydenhuollon XXVI atk-päivät 29-
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Huupponen, E., Värri, A., Hasan, J., Himanen, S-L., Lehtokangas, M. &
Saarinen, J. 2000. Comparison of Fuzzy Reasoning and Autoassociative MLP in
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EUSIPCO 2000, September 4-8, 2000, Tampere, Finland 1 Tampere. s. 55-58.
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Saarinen J. 2000. Autoassociative MLP in Sleep Spindle Detection. Journal
of Medical Systems 24 Plenum Publishing Corpo. 3, s. 183 - 193.
Kinnari, K., Pietarinen, A., Groete L., Penzel, T., Värri, A., Laippala,
P., Saastamoinen, A., Gassel, W. & Hasan, J. 2000. Vigilance stages and
performance in OSAS patients in a monotonous reaction time task. Clinical
Neurophysiology 111 s. 1130-1136.
Koivuluoma, M., Värri, A. & Flexer, A. 2000. Modelling sleep with gaussian
mixture model based on eye movements and delta-activity. In: Gabbouj, M. &
Kuosmanen, P. (eds). Signal Processing X Theories and Applications,
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Penzel, T., Guilleminault, C., Paiva, T., Värri, A., Mayer, G. & 2000. The
European Neurological Network (ENN) Supports Health Care in Sleep, Headache
and Epilepsy. ISTEP 2000, International Symposium on Telemedicine and
Teleeducation in Practice, Symposium Proceedings, 24 - 24 March, 2000,
Kosice, Slovak Republik s. 209 - 213.
Brown, N., Gibaud, B., Arvanitis, T., Hinchley, A., Britton, K., Värri, A.
& Todd-Pokropek, A. 1999. Navigation and Performance Presentation of
Multimedia Diagnostic Imaging Reports. In: Lemke, H.U. et al. (eds).
Proceedings of the 13th International Congress and Exhibition, CARS´99,
Computer Assisted Radiology and Surgery, Paris, France, June 23-26, 1999.
Excerpta Medica International Congress Series 1191 s. 479-483.
Conradt, R., Brandenburg, U., Penzel, T., Hasan, J., Värri, A. & Peter,
J.H. 1999. Vigilance transitions in reaction time test: a method of
describing the state of alertness more objectively. Clinical
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Dobrova, V., Kolpakov, F., Värri, A. & Melnik, V. 1999. Estimation of Time
Diagnostic Parameters of Blood Pressure Variation in Frequency Domain. In:
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Processing Symposium FINSIG'99, Oulu, May 31, 1999 s. 189-193.
Huupponen, E., Värri, A., Hasan, J., Himanen, S-L., Lehtokangas, M. &
Saarinen, J. 1999. Fuzzy reasoning based sleep spindle detection. In:
Saarnisaari, H. & Juntti, M. (eds.). Proceedings of the 1999 Finnish Signal
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Huupponen, E., Värri, A., Hasan, J., Himanen, S-L., Lehtokangas, M. &
Saarinen, J. 1999. Sleep spindle detection with fuzzy rules. SOTETITE,
Sosiaali- ja terveydenhuollon tietotekniikan tutkimuspäivät, 17-18.8.1999,
Turku, Finland.
Koivuluoma, M., Värri, A. & Flexer, A. 1999. EOG ja EMG signaalien
analysointi SIESTA-projektissa. SOTETITE, Sosiaali- ja terveydenhuollon
tietotekniikan tutkimuspäivät, 17-18.8.1999, Turku, Finland
Paiva, T., Guilleminault, C., Penzel, T., Zulley, J., Värri, A., Fred, A. &
Teles-Araújo, M. 1999. The European Neurological Network. In: Schulz, H.,
Parmeggiani, P. L. & Chase, M. H. (eds). Third International Congress of
the World Federation of Sleep Research Societies (WFSRS), Abstracts, Sleep
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Penzel, T., Dorffner, G., Hasan, J., Kemp, B., Schlögl, A., Värri, A.,
Barbanoj, M., Herrmann, W., Röschke, J., Rappelsberger, P., Roberts, S.,
Nielsen, KD., Saletu, B. & Zeitlhofer, J. 1999. A new standard of modelling
sleep based on polysomnograms. ISCB/GMDS 99, 20th Annual Conference of the
International Society for Clinical Biostatics, 14.-17. September 1999, 44.
Jahrestagung der Deutschen Gesellschaft fuer Medizinische Informatik,
Biometrie und Epidemiologie, 13.-16. September 1999, Session: Medical
signal and image processing -1, Sept. 13 s. 329.
Penzel, T., Dorffner, G., Himanen, S.L., Kemp, B., Schlögl, A., Roberts,
S., Värri, A., Barbanoj, M., Herrmann, W., Rappelsberger, P., Saletu, B. &
Zeitlhofer, J. 1999. A Multi-Center Study to Develop a New Standard of
Computerbased Sleepanalysis. The Physiologist, 1999 APS Conference,
Determinants of Vigilance: Interaction Between the Sleep and Circadian
Systems, October 19-22, 1999, Ft. Lauderdale, Florida 42 5, s. A-11.
Schlögi, A., Anderer, P., Barbanoj, M.-J., Klösch, G., Gruber, G., Lorenzo,
J L., Filz, O., Koivuluoma, M., Rezek, I., Roberts, S. J., Värri, A.,
Rappelsberger, P., Pfurtscheller, G. & Dorffner, G. 1999. Artefact
processing of the sleep EEG in the "siesta"-project. Proceedings of
European Medical and Biological Engineering Conference - EMBEC 1999,
Vienna, Austria, 4-7 November 1999 3 p.
Schlögl, A., Kemp, B., Penzel, T., Kunz, D., Himanen, S-L., Värri, A.,
Dorffner, G. & Pfurtscheller, G. 1999. Quality control of polysomnographic
sleep data by histogram and entropy analysis. Clinical Neurophysiology 110,
s. 2165 - 2170.
Värri, A. 1999. Work for a new European Standard on Biosignal Storage
Format begins. Medical & Biological Engineering & Computing, May 1999 36,
s. N15.
Värri, A., Brown, N.J.G., Gibaud, B., Arvanitis, T.N., Hinscley, A.,
Britton, K.E. & Todd-Pokropek, A. 1999. Aspects of Multimedia Diagnostic
Service Reports. International Seminar on Multimedia, Data Integration,
Medical Databases, Second Announcement, Warsaw, October 18-23, 1999 s.
61-62.
Kemp, B., Penzel, T., Värri, A.O., Sykacek, P., Roberts, S.J. & Nielsen,
K.D. 1998. EDF: A Simple Format for Graphical Analysis Resluts from
Polygraphic Siesta Recordings. Journal of Sleep Research, 14th European
Congress on Sleep Research, Madrid, Spain, 9-12 September, 1998 7 Blackwell
Science Ltd.. 2, s. 132.
Koivuluoma, M., Värri, A., Siren, S., Huupponen, E., Morvan, C., Trouselle,
D., Henry, J., Martins, N., Rosa, A., Conradt, R. & Penzel, T. 1998. WSCORE
- Computer Program for Telematic Sleep Medicine. Journal of Sleep Research,
14th European Congress on Sleep Research, Madrid, Spain, 9-12 September,
1998 7 Suppl. 2, s. 138.
Saastamoinen, A., Pietilä, T., Värri, A., Lehtokangas, M. & Saarinen, J.
1998. Waveform detection with RBF network - Application to automated EEG
analysis. Neurocomputing 20 s. 1-13.
van de Velde, M., van den Berg-Lenssen, M.M.C., van Boxtel, G.J.M.,
Cluitmans, P.J.M., Kemp, B., Gade, J., Thomsen, C.E. & Värri, A. 1998.
Digital Archival and Exchange of Events in a Simple Format for Polygraphic
Recordings with Application in Event Related Pontential Studies.
Electroencephalography and clinical Neurophysiology 106 6, s. 547-551.
Hirvonen, K., Hasan, J., Häkkinen, V., Värri, A. & Loula, P. 1997. The
detection of drowsiness and sleep onset periods from abulatory recorded
polygraphic data. Electroencephalography and clinical Neurophysiology 102
Elsevier Science Ireland Ltd.. s. 132-137.
Kujala, P., Eriksson, J.-T., Värri, A. & Saarinen, J. 1997. Recognition of
Epileptic spikes using a multilayer-perceptron neural network. World
Congress on Medical Physics and Biomedical Engineering, Nice, France,
September 14-19, 1997, Medical & Biological Engineering & Computing 35
Suppl. Part 1, s. 558.
Kujala, P., Värri, A., Saarinen, J. & Eriksson, J.-T. 1997. Epileptic spike
detection with neural networks. Proceedings of FINSIG'97 Conference, May
22, Pori, Finland, 1997 s. 92-96.
Nielsen, K.D., Penzel, T., Värri, A., Guilleminault, C. & Paiva, T. 1997.
Sleep, headache and epilepsy reference database with internet access - the
European neurological network project. World Congress on Medical Physics
and Biomedical Engineering, Nice, France, September 14-19, 1997, Medical &
Biological Engineering & Computing 35 Suppl. Part 2, s. 1303.
Pietarinen, A., Peter, J.H., Kinnari, K., Grote, L., Penzel, T., Värri, A.,
Laippala, P., Cassel, W. & Hasan, J. 1997. Vigilance Stages and Performance
of Osas Patients in a Monotonous Reaction Time Task. Somnologie, 5th World
Congress on Sleep Apnea, Marburg, Germany, September 17-20, 1997 1 Suppl. 2,
s. 28.
Saastamoinen, A., Pietilä, T., Värri, A., Lehtokangas, M. & Saarinen, J.
1997. Neural Network Based Method for Detecting Artefacts in the EEG.
Suomen tilastoseuran vuosikirja 1996. The Yearbook of the Finnish
Statistical Society 1996. Osa-Part I. Neural Networks and Statistics,
Tilastopäivät - Annual Conference of Statisticians, 7-8.11.1996 s. 45-63.
Värri, A., Hellmann, G., Penzel, T. & Nielsen, K.D. 1997. A new, standard
biosignal storage format. World Congress on Medical Physics and Biomedical
Engineering, Nice, France, September 14-19, 1997, Medical & Biological
Engineering & Computing 35 Suppl. Part 2, s. 1302.
Huupponen, E., Värri, A., Hasan, J., Saarinen, J. & Kaski, K. 1996.
Multi-Channel Arousal Detection using Multilayer Perceptron Network. In:
Bulsari, A.B., Kallio, S. & Tsaptsinos, D.(ed.), Proceedings of the
International Conference on Engineering Applications of Neural Networks
(EANN´96), 17-19 June 1996, London, England Lontoo, Englanti. s. 253-256.
Huupponen, E., Värri, A., Hasan, J., Saarinen, J. & Kaski, K. 1996. Sleep
Arousal Detection with Neural Network. Medical & Biological Engineering &
Computing. Proceedings of the 1st International Conference on
Bioelectromagnetism, June 9-13, 1996, Tampere 34 suppl. 1, par t 2, s.
219-220.
Penzel, T., Fuchs, K., Hassing, K., Hellman G., Macerata, A., Nielsen, K.,
Värri, A. & Zywiez, C. 1996. Scenarios on Vital Signs and Derivation of a
Domain Information Model. Medical & Biological Engineering & Computing.
Proceedings of the 10th Nordic-Baltic Conference on Biomedical Engineering,
June 9-13, 1996 34 International Federation for Medical & Biological
Engineering. suppl. 1, par t 1, s. 119-120.
Saastamoinen, A., Pietilä, T., Värri, A., Saarinen, J. & Kaski, K. 1996.
Neural Network Based Method for Tracking Artefactual Patterns in EEG.
Medical & Biological Engineering & Computing, The 1st International
Conference on Bioelectromagnetism, June 9-13, 1996, Tampere, Finland 34
Tampere. Supp. 1, Part 2, s. 243-244.
Värri, A., Hasan, J. & Astola, J. 1996. Automatic Analysis of Sleep and
Epilepsy State of the Art - Present and Future. ENN, First workshop on ENN,
31. Jan- 3.Feb.1996, Treysa, Germany, Program and Abstracts s. 1-4.
Värri, A., Hellmand, G., Penzel, T., Nielsen, K., Macerata, A., Gottlieb,
L., Hassing, K. & Zywietz, C. 1996. Object Oriented Design of a New,
Standard File Exchange Format for Vital Signs. Medical & Biological
Engineering & Computing. Proceedings of the 10th Nordic-Baltic Conference
on Biomedical Engineering 34 Journal of the International Federation for
Medical & Biological Engineering. suppl. 1, par t 1, s. 407-408.
Värri, A., Hirvonen, K., Häkkinen, V., Hasan, J. & Loula, P. 1996.
Nonlinear eye movement detection method for drowsiness studies.
International journal of bio-medical computing 43 Elsevier. s. 227-242.
Asano, A., Värri, A., Takano, N., Hasan, J., Loula, P. & Häkkinen, V. 1995.
Application of nonlinear filters to analysis of sleep process. Proceedings
of the 1995 IEICE General Conference, 27-30.3.1995, Fukuoka, Japan Japan.
The Institute of Electronics, Information and Communication Eng.. s. 143.
Asano, A., Värri, A., Takano, N., Hasan, J., Loula, P. & Häkkinen, I. 1995.
Application of nonlinear filters to analysis of sleep process. IEEE
Workshop on Nonlinear Signal and Image Processing, Volume I of II, June
20-22, 1995, Noes Marmaras, Halkidiki, Greece s. 491-494.
Grote, L., Fus, E., Värri, A., Becker, C., Janicki, J., Peter, J. H. &
Wichert, P. v. 1995. Nächtliche Hypertonie und Schlafapnoe:
Apnoe-induzierte Blutdruckanstiege im NREM- und REM-Schlaf, Nieren- und
Hochdruckkrankheiten. Jahrgang 24 1, s. 16-19.
Ternonen, M., Vuorimaa, P., Värri, A. & Hasan, J. 1995. The comparison of
Fussy SOM and MLP in vigilance analysis based on EEG, EOG and EMG. Neural
network-based EEG-analyses, International Workshop, Graz, Itävalta, June
29-30.
Tervonen, M., Vuorimaa, P., Värri, A. & Hasan, J. 1995. Vigilance
classification using neural and fuzzy methods. 3rd European Conference on
Engineering and Medicine, 1995, Firenze, Italy, May
Värri, A. 1995. 35 years of EEG spike detection. Biomed-1/Anndee, Workshop
on Enhancement of EEG-based diagnosis of neurological and psychiatric
disasdos by neural networks.
Värri, A. 1995. Challenges for the Computerized Analysis of Sleep. Workshop
on Enhancement of EEG-based diagnosis of neurological and psychiatric
disasdos by neural networks, University of Giessen, Germany, 24.2.1995.
Värri, A. 1995. Filtering techniques. BIOMED-1/ANNEE Workshop on
Enhancement of EEG-based diagnosis of neurological and psychiatric disorers
by neural networks, Imperial College, Sept. 29-30, 1995 London.
Värri, A. 1995. Terveydenhuollon tietojenkäsittelystandardit työn alla.
Lääketieteellisen fysiikan ja tekniikan yhdistyksen jäsenlehti 4, s. 3-4.
Värri, A., Kemp, B., Rosa, A. C., Nielsen, K. D., Gade, J., Penzel, T.,
Hasan, J., Hirvonen, K., Häkkinen, V., Kamphuisen, H. A. C. & Mourtazaev
1995. Multi-centre comparison of five eye movement detection algorithms. J
Sleep Res 4 European Sleep Research Society. s. 119-130.
Värri, A., Penzel, Th., Brandenburg, U. & Peter, J. H. 1995. Interactive
computer program for the analysis of cardiovascular polysomnographic
recordings. Pneumologie 49 Marz, s. 108-112.
Pietilä, T., Vapaakoski, S., Nousiainen , U., Värri, A., Frey, H., Häkkinen
, V. & Neuvo, Y. 1994. Evaluation of a compurized system for recognition of
epileptic activity during long-term EEG monitoring. Electroencephalography
Clinical Neurophysiology 90 s. 438-443.
Pulli, K., Härmä, M., Hasan, J., Värri, A. & Loula, P. 1994. Autonomic
activity as measured by SCSB and EEG delta activity during sleep. 12th
Congress of the European Sleep Research Society, 22.-27.5.1994, Firenze,
Italy, Journal of Sleep Research, Vol. 3, Suppl. 1, 1994 Firenze, Italy. s.
212.
Pulli, K., Härmä, M., Hasan, J., Värri, A. & Loula, P. 1994. The
relationship between EEG delta activity and autonomic activity as measured
by SCSB during daytime sleep. Journal of Sleep Research 3 s. 106-110.
Värri A., Grote L., Penzel T., Cassel , w. Peter, J. H. & Hasan, J. 1994. A
new method to study blood pressure, heart rate and EEG as a function of
reaction time. Methods of Information in Medicine, Special Issue on
Biosignal Interpretation (IMIA/IFBME) 33 1, s. 64-67.
Häkkinen, V., Hirvonen, K., Hasan, J., Kataja, M., Värri, A., Loula, P. &
Eskola, H. 1993. The effect of small differences in electrode position on
EOG vigilance data. Electroenceph Clin Neurophysiol 86 s. 294-300.
Hasan, J., Hirvonen, K., Värri, A., Häkkinen, V. & Loula, P. 1993.
Validation of computer analysed polygraphic patterns during drowsiness and
sleep onset. Electroencephalogr. Clin. Neurophysiol. 87 s. 117-127.
Neejärvi, J., Värri, A., Fotopoulos, S. & Neuvo, Y. 1993. Weighted FMH
filters. Journal Signal Processing 31 2, s. 181-190.
Penzel, T., Brandenburg, U., Peter, J . H., Värri, A. & von Wichert, P.
1993. Kontinuerliche Spektralanalyse zur Erfassung apnoebezogener
Blutdruckschwankungen. Proceedings of the Joint Annual Congress of the
German, Autrian and Swiss Soc ieties of Biomedical Technology,
16.-18.9.1993, Graz, Austria, Biomedizinisch e Technik 38 Ergänzungsband,
s. 111-112.
Penzel, T., Grote, L., Peter, J. H., Värri, A., Voigt, K. H. & von Wichert,
P. 1993. Blood pressure and heart rate responses on reaction-time test
under conditions of monotology. Proceedings of the Annual Conference of the
German Society of Physiology, Feb ruary 1993, Munchen, Plugers Archiv
European Journal of Physiology 422 Suppl. 1, s. 103.
Värri, A. 1993. Muissa kaupungeissa on yliopisto, Marburg on yliopisto.
Anturi 18.3.1993 3, s. 8-9.
Värri, A., Elo, P., Saarinen, J., Loula, P., Pietilä, T., Vapaakoski, S. &
Kaski, K. 1993. Pattern recognition of the EEG in epilepsy with neural
networks. Abstact book of the Second International Hans-Berger-Congress
Quantitative an d Topological EEG and MEG Analysis, Jena, Germany,
8.-11.9.1993, supplemt
Värri, A., Grote, L., Penzel, T., Cassel, W., Peter, J. H. & Hasan, J. 1993
. A new method to study blood pressure heart rate and EEG as a function of
reaction time. Proceedings of the IMIA-IFBME Working Conference on
Biosignal Interpretation Rebild Bakker, Aalborg, Denmark, 25.-27.8.1993 s.
62-65.
Värri, A. & Penzel, T. 1993. Intelligent biomedical signal processing -
Application to tape recorder noise. Proceedings of the Joint Congress of
the German, Austrian and Swiss Societie s of Biomedical Technology,
16.-18.9.1993, Graz, Austria, Biomedizienische Te chnik 38 Ergänzungsband,
s. 283-284.
Värri, A., Penzel, T., Brandenburg, U . & Peter, J. H. 1993. Interactive
computer program for the analysis of cardiovascular polysomnographic
recordings. Annual meeting of the work group Nocturnal Breathing and
Circulation Disorder s of the German Society of Pneumology, Nordernay,
Germany, 18.-20.3.1993.
Elo, P., Saarinen, J., Värri, A., Nieminen, H. & Kaski, K. 1992.
Classification of Epileptic EEG by Using Self-Organized Maps. 10th Progress
Report Meeting and Annual Meeting of the Finnish Society for Me dical
Physics and Medical Engineering. Helsinki University of Technology, Fin
land, March 1992 s. 15-18.
Elo, P., Saarinen, J., Värri, A., Nieminen, H. & Kaski, K. 1992.
Classification of Epileptic EEG by Using Self-Organizing Maps. Proceedings
of the 1992 International Conference on Artificial Neural Networks,
ICANN'92. Eds. Aleksander, I. & Tayler, J., Artificial Neural Networks 2,
Vol 2, Brigton, 4.-7.9.1992 Amsterdam. Elsevier. s. 1147-1150.
Elo, P., Saarinen, J., Värri, A., Nieminen, H. & Kaski, K. 1992.
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Report Meeting and Annual Meeting of Finnish Society for Medical
Engineering, Helsinki 26.-27.3.1992. Institute of Biomedical Engineering,
Report TKK-F-B Otaniemi. Helsinki University of Technology. 145, s. 23-26.
Kemp, B., Värri, A., Rosa, A. C., Nielsen, K. D. & Gade, J. 1992. A Simple
Format for Exchange of Digitized Polygraphic Recordings.
Electroencephalography & Clinical Neurophysiology 82 s. 391 - 393.
Kulju, H. & Värri, A. 1992. Procede et Appareil de Comptage d'Objects dans
une Zone Donnee. Patentti No. 8707301, 21.2.1992 2599531.
Loula, P., Värri, A., Hasan, J. & Hirvonen, K. 1992. Vigilance analysis by
using VIRTU-method. 10th Progress Meeting and Annual Meeting of the Finnish
Siciety for Medical P Physics and Medical Engineering. Helsinki University
of Technology, Finland, March 1992 s. 23-26.
Pietilä, T., Vapaakoski, S., Nousiainen , U. & Värri, A. A. 1992. Method
for Evaluation of Different EEG Monitoring Systems. AES Proceedings,
Epilepsia vol 33 Suppl. 3, s. 12.
Stampi, C., Hasan, J., Hirvonen, K., Värri, A. & Loula, P. 1992. State
Variability as an Index of Drowsiness: Automatic Vigilance Analysis in
Truck Drivers. 11th Congress of the European Sleep Research Society, Hki,
Finland, July 5-10, 1992.
Stampi, C., Hasan, J., Hirvonen, K., Värri, A. & Loula, P. 1992. State
Variability as an Index of Drowsiness: Automatic Vigilance Analysis in
Truck Drivers. Journal of Sleep Research, June 1992 s. 217.
Värri, A. 1992. Algorithms and systems for the analysis of long-term
physiological signals. Tampereen teknillinen korkeakoulu, Julkaisuja
Tampere. 99, 211 s.
Värri, A., Häkkinen, V., Hasan, J., Hirvonen, K. & Loula, P. 1992. R-R
Interval Changes with Lowering of Vigilance. 11th Congress of the European
Sleep Research Society, Hki, Finland, July 5-10
Värri, A., Häkkinen, V., Hasan, J., Hirvonen, K. & Loula, P. 1992. R-R
Interval Changes with Lowering of Vigilance. Journal of Sleep Research,
June 1992 1 1, s. 239.
Värri, A., Hirvonen, K., Hasan, J., Loula, P. & Häkkinen, V. 1992. A
Computerized Analysis System for Vigilance Studies. Computer Methods and
Programs in Biomedicine.
Värri, A., Neejärvi, J. & Neuvo, Y. 1992. A New Class of Digital Filters
with Applications in Biomedical Signal Processing. Proc. of VII
Mediterranean Conference on Medical and Biological Engineering,
(MEDICON'92), July 5-10, 1992.
Värri, A., Neejärvi, J. & Neuvo, Y. 1992. A New Class of Filters to Remove
Artifacts from Physiological Signals. Proc. of EUSIPCO-92, 6th European
Signal Processing Conference, Brussels, Belgium, August 24-27, 1992 s. 1741
- 1744.
Frey, H., Värri, A., Loula, P. & Neuvo, Y. 1991. What mathemathical
algorithms should be used for the adaptive segmentation of the long-term
EEG recordings in epilepsy. 19th Int.Epilepsy Congress, Rio Janeiro,
Brazil, 14-19.10.1991.
Häkkinen, V., Hirvonen, K., Hasan, J. , Kataja, M., Värri, A., Loula, P. &
Eskola, H. 1991. Effect of small differences in electrode positions on EOG
vigilance signals (Abstract). Sleep Congress, Cannes, 1991.
Häkkinen, V., Hirvonen, K., Hasan, J., Kataja, M., Värri, A., Loula, P. &
Eskola, H. 1991. Effects of small differences in electrode positions on EOG
vigilance signals. Founding Congress of the World Federation of Sleep
Research Societies.
Hasan, J., Hirvonen, K., Värri, A., Loula, P. & Häkkinen, V. 1991.
Computerized Vigilance Analysis Using Adaptive Segmentation. Nordiska
sömnforskningskongressen, Hverageroi, Island, 12-15.6.1991.
Hasan, J., Hirvonen, K., Värri, A., Loula, P., Häkkinen, V. & Frey, H. 1991
. Preliminary evaluation of computerized vigilance analysis by using
adaptive segmentation. Founding Congress of the World Federation of Sleep
Research Societies, Cannes, France, 21-25.9.1991.
Hirvonen, K., Hasan, J., Häkkinen, V., Värri, A. & Loula, P. 1991.
Automatic vigilance analysis & scoring system for ambulatory recordings.
Founding Congress of the World Federation of Sleep Research Societies,
Cannes, France, 21-25.9.1991.
Kemp, B., Värri, A., Rosa, A., Nielsen, K., Gade, J. & Penzel, T. 1991.
Analysis of brain synchronization based on noise-driven feedback models.
IEEE Conference on Biomedical Engineering, Orlando, USA, 31.10-3.11.1991.
Krajca, V., Petranek, S., Patakova, I. & Värri, A. 1991. Automatic
Identification of Significant Graphoelements in Multichannel EEG Recordings
by Adaptive Segmentation and Fuzzy Clustering. Int.J.Bio-Medical Computing
28 s. 71-89.
Krajca, V., Petranek, S., Värri, A. & Frey, H. 1991. On-line multichannel
adaptive segmentation as a basement of long-term EEG processing. IEEE
International Conference on Biomedical Engineering, Orlando, USA,
31.10-3.11.1991.
Värri, A., Häkkinen, V., Hasan, J. & Loula, P. 1991. A New Nonlinear EOG
Processing method for Vigilance Studies. 1st European Conference on
Biomedical Engineering,Nice,France,17-20.2.1991 s. 334-335.
Frey, H., Värri, A., Krajca, V., Loula, P., Melkinen, H., Häkkinen, V., &
Neuvo, Y. 1990. Comparison of Different Mathematical Algorithms Used for
the Adaptive Segmentation of the Long Term EEG Recording. 5th European
Congress of Clinical Term EEG Recording, 5th European Congress of Clinical
Neurophysiology, Paris, France, 9-12 Sept. 1990 s. 61.
Hasan, J., Värri, A., Loula, P. & Häkkinen, V. 1990. Computer Aided
Interactive Vigilance Analysis by Using Polygraphic Recordings. 10th
Congress of The European Sleep Research Society, Strasbourg, 20-25.5. 1990,
(Abstract book) s. 431.
Värri, A., Häkkinen, V., Hasan, J. & Loula, P. 1990. Automatic EOG
Processing in a Vigilance Analysis systems. XIII Annual Joint Meeting of
Electroencephalography and Clinical Neurophysiology, Prague, 14.-17.5.
1990, Proceedings.
Värri, A., Häkkinen, V., Hasan, J. & Loula, P. 1990. Eye Movement detection
for Automatic Vigilance Analysis. Horne J. (Ed.) Sleep`90, Pontenagel
Press, Bochum 1990 s. 82-84.
Värri, A., Häkkinen, V., Hasan, J., & Loula, P. 1990. Eye Movement
Detection for Automatic Vigilance Analysis. 10th Congress of The European
Sleep Research Society, Strasbourg, 20-25.5.1990 (Abstract book) s. 430.
Värri, A., Hasan, J., Loula, P. & Häkkinen, V. 1990. A Computer-Aided
Interactive Vigilance Analysis System (Abstract). IV Nordiska
sömnforskningskongressen, Turku, Finland, 30-31.1990 s. 13.
Yli-Hankala, A., Värri, A., Jäntti, V. & Heikkilä, H. 1990. Correlation
between the EEG and Heart Rate Variation in Deep Entflurane Anaesthesia.
Acta Anaesthesia Scandinavica, 1990 Vol 34, pp. 138-143.
Frey, H., Häkkinen, V., Korpinen, L., Värri, A., Loula, P., Saranummi, N. &
Neuvo, Y. 1989. Long-term EEG recording in epilepsy and its automatic
analysis. XXXI International Congress of Physiological Sciences, Helsinki,
Finland, 9.-14.7.1989, Abstracts s. 315.
Frey, H., Häkkinen, V., Loula, P., Värri, A., Saranummi, N. & Neuvo, Y.
1989. Long-term video recording of EEG in epilepsy and automatic real-time
analysis. The First Vaajasalo International Epilepsy Symposium, Vaajasalo,
Finland, 17.-18.5.1989, Abstracts.
Frey, H., Loula, P., Värri, A., Häkkinen, V., Saranummi, N. & Neuvo, Y.
1989. Intensive monitoring of the epileptic discharge using automatic
real-time analysis. The 18th International Epilepsy Congress, New Delhi,
India, October 17-22, 1989, Abstracts s. 96.
Kulju, H. & Värri, A. 1989. Method of and apparatus for counting objects.
Pat.US USA. United States Patent Office. 4 800 386.
Loula, P., Frey, H., Häkkinen, V., Värri, A., Saranummi, N. & Neuvo, Y.
1989. Automatic real-time analysis of the long-term EEG. XIVth World
Congress of Neurology, New Delhi, India, October 22-27, 1989, Abstracts.
Nieminen, A., Neuvo, Y., Värri, A. & Mitra, U. 1989. Algorithms for
real-time trend detection. Signal Processing 18 Elsevier Science Publishers
B.V.. 9, s. 1-15.
Värri, A. 1989. A method to improve the detection of eye movements. In:
Jarske, Tiina (toim.) URSI/IEEE, XV Convention on Radio Science,
20.-21.11.1989, Abstracts L 2/3.
Frey, H., Jäntti, V., Häkkinen, T., Erilä, P., Loula, S., Kalli, N.,
Saranummi, A., Värri, A. & Neuvo, Y. 1988. Long-Term EEG During Epileptic
Discharges and Automatic Real Time Analysis. Proc.of the 27th Scandinavian
Congress of Neurology, Kuopio, Finland, June 15-18, 1988, Acta Neurologica
Scandinavia, Supplementum 77 116.
Häkkinen, V., Värri, A., Neuvo, Y., Frey, H. & Heikkilä, H. 1988.
Quantitative EEG During Wakefulness and Sleep Using Adaptive Segmentation.
9th European Congress of Sleep Research, Jerusalem, Israel, September 4-9,
1988.
Loula, P., Värri, A., Heikkilä, H. & Frey, H. 1988. System for automatic
real-time analysis of the long-term EEG in epilepsy. Proceedings of the 1st
European Congress of Neurology. Modern Trends in Neurology and Neurologic
al Emergencies, Prague, Czechoslovakia, April 1988.
Värri, A., Neuvo, Y., Loula, P. & Heikkilä, H. 1988. Computerized
Classification of Long Term Recordings of Epileptic EEG. STeP-88, Finnish
Artificial Intelligence Symposium, University of Helsinki, August 15-18 1
s. 53-62.
Värri, A., Neuvo, Y., Loula, P. & Hiekkilä, H. 1987. Computerized
Classification of Long Term Recordings of Epileptic EEG. URSI/IEEE XIII
Radiotieteen päivä, Oulu, 3 November Oulu. s. 16.