Ulf Indahl - Academia.edu (original) (raw)

Papers by Ulf Indahl

Research paper thumbnail of Addressing overfitting on point cloud classification using Atrous XCRF

ISPRS Journal of Photogrammetry and Remote Sensing, 2019

Research paper thumbnail of The O-PLS methodology for orthogonal signal correction-is it correcting or confusing?

Journal of Chemometrics, 2017

Research paper thumbnail of Deriving Animal Movement Behaviors Using Movement Parameters Extracted from Location Data

ISPRS International Journal of Geo-Information

Research paper thumbnail of A similarity index for comparing coupled matrices

Research paper thumbnail of MATLAB function having PPLS and PPLS-DA as special cases

Research paper thumbnail of Land Cover Segmentation of Airborne LiDAR Data Using Stochastic Atrous Network

Research paper thumbnail of A model to secure a stable iodine concentration in milk

Food & nutrition research, 2015

Dairy products account for approximately 60% of the iodine intake in the Norwegian population. Th... more Dairy products account for approximately 60% of the iodine intake in the Norwegian population. The iodine concentration in cow's milk varies considerably, depending on feeding practices, season, and amount of iodine and rapeseed products in cow fodder. The variation in iodine in milk affects the risk of iodine deficiency or excess in the population. The first goal of this study was to develop a model to predict the iodine concentration in milk based on the concentration of iodine and rapeseed or glucosinolate in feed, as a tool to securing stable iodine concentration in milk. A second aim was to estimate the impact of different iodine levels in milk on iodine nutrition in the Norwegian population. Two models were developed on the basis of results from eight published and two unpublished studies from the past 20 years. The models were based on different iodine concentrations in the fodder combined with either glucosinolate (Model 1) or rapeseed cake/meal (Model 2). To illustrate ...

Research paper thumbnail of Probabilistically assisted spot segmentation � With application to DNA microarray images

Chemometrics and Intelligent Laboratory Systems, 2009

Research paper thumbnail of EP-1517: Cervical tumour segmentation using multi-sequence MRI and linear discriminant analysis

Research paper thumbnail of Software effort estimation by analogy and regression toward the mean

Estimation by analogy is, simplified, the process of finding one or more projects that are simila... more Estimation by analogy is, simplified, the process of finding one or more projects that are similar to the one to be estimated and then derive the estimate from the values of these projects. If the selected projects have an unusual high or low productivity, then we should ...

Research paper thumbnail of Daylength influences the response of three clover species (Trifolium spp.) to short-term ozone stress

Boreal Environment Research

Long photoperiods characteristic of summers at high latitudes can increase ozone-induced foliar i... more Long photoperiods characteristic of summers at high latitudes can increase ozone-induced foliar injury in subterranean clover (Trifolium subterraneum). This study compared the effects of long photoperiods on ozone injury in red and white clover cultivars adapted to shorter or longer daylengths of southern or northern Fennoscandia. Plants were exposed to 70 ppb ozone for six hours during the daytime for three consecutive days. Simultaneously, the daylength in the growth rooms was altered to long-day (10 h light; 14 h dim light) and short-day (10 h light; 14 h darkness) conditions. Thermal imaging showed that ozone disrupted leaf temperature and stomatal function, particularly in sensitive species, in which leaf temperature deviations persisted for several days after ozone exposure. Long-day conditions increased visible foliar injury (30%-70%), characterized by chlorotic and necrotic areas, relative to short day conditions in all species and cultivars independently of the photoperiod ...

Research paper thumbnail of MATLAB function having PPLS and PPLS-DA as special cases

Research paper thumbnail of mayonnaise

Research paper thumbnail of Relationships between Sensory Measurements and Features Extracted from Images

Data Handling in Science and Technology, 1996

... RELATIONSHIPS BETWEEN SENSORY MEASUREMENTS AND FEATURES EXTRACTED FROM IMAGES Knut Kvaal, Per... more ... RELATIONSHIPS BETWEEN SENSORY MEASUREMENTS AND FEATURES EXTRACTED FROM IMAGES Knut Kvaal, Pernille Baardseth, Ulf G Indahl and Tomas ... Kjolstad, L.,Isaksson, T. and Rosenfeld, HJ Prediction of Sensory Quality by Near Infrared Reflectance of Frozen ...

Research paper thumbnail of Detection of mechanically recovered meat and head meat from cattle in ground beef mixtures by multivariate analysis of isoelectric focusing protein profiles

Meat Science, 2001

The present work investigates the possibility of constructing a multivariate calibration model fo... more The present work investigates the possibility of constructing a multivariate calibration model for predicting the composition of ground beef with respect to different meat quality types, based on intensity profiles from isoelectric focusing of water-soluble proteins. Beef mixtures containing various amounts of mechanically recovered meat, head meat and production meat from beef, were analysed by isoelectric focusing in immobilised pH-gradients. The gels were photographed and the images transferred to a digital format. By simple image processing procedures, background colour was virtually eliminated and signal strength was improved to a considerable degree. Multivariate analysis of protein profiles from the gels gave models explaining 75 to 90% of variance in sample composition. Manually deboned meat was explained to the highest degree, and with a precision of 7%. Two different qualities of mechanically recovered meat could be detected even when treated as one category. The present approach needs further refinement, but seems applicable for detecting intentional substitution of high quality meat products with low-price raw materials. One advantage of the approach is that evaluation of samples is not dependent on specific knowledge on the individual components to be analysed, so that such analytical methods are relatively easy to implement in any standard laboratory.

Research paper thumbnail of The Response of Enterococcus faecalis V583 to Chloramphenicol Treatment

International Journal of Microbiology, 2010

Research paper thumbnail of Pixel classification methods for identifying and quantifying leaf surface injury from digital images

Computers and Electronics in Agriculture, 2014

Research paper thumbnail of Temporal Lobe Epilepsy and Matrix Metalloproteinase 9: A tempting relation but negative genetic association

Research paper thumbnail of Pixel-based analysis of multiple images for the identification of changes: A novel approach applied to unravel proteome patters of 2-D electrophoresis gel images

Research paper thumbnail of Software effort estimation by analogy and “regression toward the mean”

Journal of Systems and Software, 2003

Estimation by analogy is, simplified, the process of finding one or more projects that are simila... more Estimation by analogy is, simplified, the process of finding one or more projects that are similar to the one to be estimated and then derive the estimate from the values of these projects. If the selected projects have an unusual high or low productivity, then we should ...

Research paper thumbnail of Addressing overfitting on point cloud classification using Atrous XCRF

ISPRS Journal of Photogrammetry and Remote Sensing, 2019

Research paper thumbnail of The O-PLS methodology for orthogonal signal correction-is it correcting or confusing?

Journal of Chemometrics, 2017

Research paper thumbnail of Deriving Animal Movement Behaviors Using Movement Parameters Extracted from Location Data

ISPRS International Journal of Geo-Information

Research paper thumbnail of A similarity index for comparing coupled matrices

Research paper thumbnail of MATLAB function having PPLS and PPLS-DA as special cases

Research paper thumbnail of Land Cover Segmentation of Airborne LiDAR Data Using Stochastic Atrous Network

Research paper thumbnail of A model to secure a stable iodine concentration in milk

Food & nutrition research, 2015

Dairy products account for approximately 60% of the iodine intake in the Norwegian population. Th... more Dairy products account for approximately 60% of the iodine intake in the Norwegian population. The iodine concentration in cow's milk varies considerably, depending on feeding practices, season, and amount of iodine and rapeseed products in cow fodder. The variation in iodine in milk affects the risk of iodine deficiency or excess in the population. The first goal of this study was to develop a model to predict the iodine concentration in milk based on the concentration of iodine and rapeseed or glucosinolate in feed, as a tool to securing stable iodine concentration in milk. A second aim was to estimate the impact of different iodine levels in milk on iodine nutrition in the Norwegian population. Two models were developed on the basis of results from eight published and two unpublished studies from the past 20 years. The models were based on different iodine concentrations in the fodder combined with either glucosinolate (Model 1) or rapeseed cake/meal (Model 2). To illustrate ...

Research paper thumbnail of Probabilistically assisted spot segmentation � With application to DNA microarray images

Chemometrics and Intelligent Laboratory Systems, 2009

Research paper thumbnail of EP-1517: Cervical tumour segmentation using multi-sequence MRI and linear discriminant analysis

Research paper thumbnail of Software effort estimation by analogy and regression toward the mean

Estimation by analogy is, simplified, the process of finding one or more projects that are simila... more Estimation by analogy is, simplified, the process of finding one or more projects that are similar to the one to be estimated and then derive the estimate from the values of these projects. If the selected projects have an unusual high or low productivity, then we should ...

Research paper thumbnail of Daylength influences the response of three clover species (Trifolium spp.) to short-term ozone stress

Boreal Environment Research

Long photoperiods characteristic of summers at high latitudes can increase ozone-induced foliar i... more Long photoperiods characteristic of summers at high latitudes can increase ozone-induced foliar injury in subterranean clover (Trifolium subterraneum). This study compared the effects of long photoperiods on ozone injury in red and white clover cultivars adapted to shorter or longer daylengths of southern or northern Fennoscandia. Plants were exposed to 70 ppb ozone for six hours during the daytime for three consecutive days. Simultaneously, the daylength in the growth rooms was altered to long-day (10 h light; 14 h dim light) and short-day (10 h light; 14 h darkness) conditions. Thermal imaging showed that ozone disrupted leaf temperature and stomatal function, particularly in sensitive species, in which leaf temperature deviations persisted for several days after ozone exposure. Long-day conditions increased visible foliar injury (30%-70%), characterized by chlorotic and necrotic areas, relative to short day conditions in all species and cultivars independently of the photoperiod ...

Research paper thumbnail of MATLAB function having PPLS and PPLS-DA as special cases

Research paper thumbnail of mayonnaise

Research paper thumbnail of Relationships between Sensory Measurements and Features Extracted from Images

Data Handling in Science and Technology, 1996

... RELATIONSHIPS BETWEEN SENSORY MEASUREMENTS AND FEATURES EXTRACTED FROM IMAGES Knut Kvaal, Per... more ... RELATIONSHIPS BETWEEN SENSORY MEASUREMENTS AND FEATURES EXTRACTED FROM IMAGES Knut Kvaal, Pernille Baardseth, Ulf G Indahl and Tomas ... Kjolstad, L.,Isaksson, T. and Rosenfeld, HJ Prediction of Sensory Quality by Near Infrared Reflectance of Frozen ...

Research paper thumbnail of Detection of mechanically recovered meat and head meat from cattle in ground beef mixtures by multivariate analysis of isoelectric focusing protein profiles

Meat Science, 2001

The present work investigates the possibility of constructing a multivariate calibration model fo... more The present work investigates the possibility of constructing a multivariate calibration model for predicting the composition of ground beef with respect to different meat quality types, based on intensity profiles from isoelectric focusing of water-soluble proteins. Beef mixtures containing various amounts of mechanically recovered meat, head meat and production meat from beef, were analysed by isoelectric focusing in immobilised pH-gradients. The gels were photographed and the images transferred to a digital format. By simple image processing procedures, background colour was virtually eliminated and signal strength was improved to a considerable degree. Multivariate analysis of protein profiles from the gels gave models explaining 75 to 90% of variance in sample composition. Manually deboned meat was explained to the highest degree, and with a precision of 7%. Two different qualities of mechanically recovered meat could be detected even when treated as one category. The present approach needs further refinement, but seems applicable for detecting intentional substitution of high quality meat products with low-price raw materials. One advantage of the approach is that evaluation of samples is not dependent on specific knowledge on the individual components to be analysed, so that such analytical methods are relatively easy to implement in any standard laboratory.

Research paper thumbnail of The Response of Enterococcus faecalis V583 to Chloramphenicol Treatment

International Journal of Microbiology, 2010

Research paper thumbnail of Pixel classification methods for identifying and quantifying leaf surface injury from digital images

Computers and Electronics in Agriculture, 2014

Research paper thumbnail of Temporal Lobe Epilepsy and Matrix Metalloproteinase 9: A tempting relation but negative genetic association

Research paper thumbnail of Pixel-based analysis of multiple images for the identification of changes: A novel approach applied to unravel proteome patters of 2-D electrophoresis gel images

Research paper thumbnail of Software effort estimation by analogy and “regression toward the mean”

Journal of Systems and Software, 2003

Estimation by analogy is, simplified, the process of finding one or more projects that are simila... more Estimation by analogy is, simplified, the process of finding one or more projects that are similar to the one to be estimated and then derive the estimate from the values of these projects. If the selected projects have an unusual high or low productivity, then we should ...