Unto Tapper

Positive matrix factorization: A non‐negative factor model with optimal utilization of error estimates of data values

Pentti Paatero, Unto Tapper · Environmetrics · 1994 · 6.1K citations

Low-rank Approximation, Engineering, Optimal Utilization +15

Analysis of different modes of factor analysis as least squares fit problems

Pentti Paatero, Unto Tapper · Chemometrics and Intelligent Laboratory Systems · 1993 · 474 citations

Parallel Analysis, Latent Modeling, Matrix Factorization +9

Health and environmental safety aspects of friction grinding and spray drying of microfibrillated cellulose

Jari Vartiainen, Tiina Pöhler, Kristiina Sirola et al. · Cellulose · 2011 · 291 citations

Spray Drying, Mechanical Engineering, Wood Fibre +5

Fine particle and gaseous emissions from normal and smouldering wood combustion in a conventional masonry heater

Jarkko Tissari, Jussi Lyyränen, Kati Hytönen et al. · Atmospheric Environment · 2008 · 214 citations

Engineering, Conventional Masonry Heater, Combustion Science +6

Source identification of bulk wet deposition in Finland by positive matrix factorization

Pia Anttila, Pentti Paatero, Unto Tapper et al. · Atmospheric Environment · 1995 · 187 citations

Hydrogeology, Environmental Monitoring, Engineering +8