No description available.

It is widely accepted that color is perceived categorically. Categorical perception of color can be defined as the tendency to discriminate colors that are from different categories easier, quicker and more accurately than colors that are from the same category. The present study investigated whether brain activity patterns verifies the concept of categorical color perception, an instantiation of top-down influences on low-level perception. Participants performed a color discrimination task on color pairs. Three categories of color pairs are defined in the green-blue region as follows. One of the pairs was specified as cross-category pair by choosing one color from green side of the green-blue boundary and the other color from blue side. The other two pairs were featured as within-category pairs by choosing two shades of green for within-green pair and two shades of blue for within-blue pair. Crucially, the pairs varied only in hue dimension and the physical distance between each of three pairs was set to 10 degrees in CIE LCh space. Pairs on the screen are displayed adjacently or with gaps in between, to further investigate the effect of space in color discrimination. Correct responses, reaction times and fMRI BOLD signals are recorded. Behavioral findings yielded a decrementing pattern from green to blue region challenging the prediction of categorical perception argument that performance is better at green-blue boundary than both within green and blue regions. Behavioral findings also indicated that adjacent display of colors facilitated color discrimination when compared to display of colors with spatial gaps. Brain activity patterns indicated that separate neural processes might underlie these distinct behavioral differences. Although standardized with respect to the color metric, the three categories of our experiment might have involved differences with respect to difficulty levels and memory requirements. Brain activity differences reported in the within-green condition versus cross-category condition are focused on Frontal Eye Fields and Fusiform Gyrus, which is seem to be modulated by Frontal Eye Field activity / increased activation in these regions is related to enhanced visual performance and higher scores, which is consistent with significantly better performance in within-green discrimination than cross-category discrimination. For the same contrast, Parahippocampal Gyrus and Precuneus activations suggest better visual recall and behavioral improvement due to more efficient maintenance in spatial working memory for within-green discrimination than cross-category discrimination. Brain activity differences reported in the within-blue condition versus cross-category condition is focused on Superior Temporal Gyrus, which is involved in color discrimination having the role of color memory. When within-green and within-blue conditions are compared, there was differential activation in the Fusiform Gyrus, and this is the only brain activity which might be attributed to a categorical effect. This comparison also yielded activity in Medial Frontal and Superior Frontal regions concerning more confident perceptual decisions and improved performance on within-green discrimination than within-blue discrimination. In addition, spatial separation of stimuli entailed more cognitive resources to color discrimination than adjacent stimuli as suggested by Cuneus and Lingual Gyrus activations. Overall, to the best of our knowledge our study is the first to investigate the neural framework for color perception, which revealed that color perception might involve several complex sub-processes that activate memory and attention.

abstract: We experience spatial separation and temporal asynchrony between visual and haptic information in many virtual-reality, augmented-reality, or teleoperation systems. Three studies were conducted to examine the spatial and temporal characteristic of multisensory integration. Participants interacted with virtual springs using both visual and haptic senses, and their perception of stiffness and ability to differentiate stiffness were measured. The results revealed that a constant visual delay increased the perceived stiffness, while a variable visual delay made participants depend more on the haptic sensations in stiffness perception. We also found that participants judged stiffness stiffer when they interact with virtual springs at faster speeds, and interaction speed was positively correlated with stiffness overestimation. In addition, it has been found that participants could learn an association between visual and haptic inputs despite the fact that they were spatially separated, resulting in the improvement of typing performance. These results show the limitations of Maximum-Likelihood Estimation model, suggesting that a Bayesian inference model should be used. / Dissertation/Thesis / Doctoral Dissertation Human Systems Engineering 2017

No description available.

Fires in buildings ranging in size from small residential houses to large office buildings and sports stadiums pose significant threats to human safety. Many advances have been made in the area of fire behaviour modeling and have lead to much safer, and more efficient fire protection engineering designs, saving countless lives. Fire, however, is still a difficult phenomenon to accurately model and the most important quantity used to describe a fire is the heat (energy) release rate (HRR). Predictions of the fire hazard posed by mattresses, using relatively simple modeling techniques, were investigated in this research work and compared to full-scale experimental results. Specifically, several common methods of predicting the HRR from a mattress fire were examined. Current spatial separation guidelines, which exist in order to mitigate fire spread between buildings, were used to predict radiation heat flux levels emitted by a burning building and compared to experimental results measured in the field. Enclosure ceiling temperatures, predicted using the Alpert temperature correlation, and average hot gas layer temperature predictions were also compared to experimental results. Results from this work indicate that the t-squared fire heat release rate modeling technique combined with the common Alpert ceiling temperature correlation, provide a reasonable prediction of real-life fire temperatures as results within 30% were obtained. The cone calorimeter was also found to be a useful tool in the prediction of full-scale fire behaviour and the guidelines used for spatial separation calculations were found to predict the radiant heat flux emitted by a burning building reasonably well.

Fires in buildings ranging in size from small residential houses to large office buildings and sports stadiums pose significant threats to human safety. Many advances have been made in the area of fire behaviour modeling and have lead to much safer, and more efficient fire protection engineering designs, saving countless lives. Fire, however, is still a difficult phenomenon to accurately model and the most important quantity used to describe a fire is the heat (energy) release rate (HRR). Predictions of the fire hazard posed by mattresses, using relatively simple modeling techniques, were investigated in this research work and compared to full-scale experimental results. Specifically, several common methods of predicting the HRR from a mattress fire were examined. Current spatial separation guidelines, which exist in order to mitigate fire spread between buildings, were used to predict radiation heat flux levels emitted by a burning building and compared to experimental results measured in the field. Enclosure ceiling temperatures, predicted using the Alpert temperature correlation, and average hot gas layer temperature predictions were also compared to experimental results. Results from this work indicate that the t-squared fire heat release rate modeling technique combined with the common Alpert ceiling temperature correlation, provide a reasonable prediction of real-life fire temperatures as results within 30% were obtained. The cone calorimeter was also found to be a useful tool in the prediction of full-scale fire behaviour and the guidelines used for spatial separation calculations were found to predict the radiant heat flux emitted by a burning building reasonably well.

Les distributions spatiales des racines fines de Quercus rubra L. (CHR), Populus deltoides x nigra (DN3570) (PEH) et d’une culture fourragère (FOUR) ont été étudiées dans un système agroforestier de culture intercalaire (SCI) du sud du Québec (Canada). L’étude ne révèle pas d’enracinement plus profond des arbres en SCI, mais des profils superficiels à l’instar de nombreuses espèces d’arbres en plantations ou en milieu naturel. Une séparation spatiale existe entre les systèmes racinaires du FOUR et des CHR dont la densité relative selon la profondeur est plus faible que celle de la culture de 0 à 10 cm, mais plus élevée de 10 à 30 cm. Les PEH ne présentent pas d’adaptation racinaire et les hautes valeurs de densités de longueur racinaires (FRLD) de surface près du tronc entraînent une diminution de 45 % de la densité racinaire de surface du fourrage, suggérant une forte compétition pour les ressources du sol. L’étude du rendement agricole a d’ailleurs révélé des réductions de biomasse fourragère particulièrement près des PEH. Cependant, les résultats d’une analyse à composantes principales suggèrent un impact secondaire de la compétition racinaire sur le rendement agricole, et une plus grande importance de la compétition pour la lumière. L’impact des PEH à croissance rapide sur la culture est plus grand que celui du CHR. Cependant, ils seront récoltés plus rapidement et l’espace libéré favorisera la croissance de la culture intercalaire. Cet aspect dynamique des SCI les rapproche des écosystèmes naturels et devrait être réfléchi et approfondi pour leur succès futur. / Spatial distributions of fine roots were studied in a tree-based intercrop system (TBI) with Quercus rubra L. (CHR), Populus deltoides x nigra (DN3570) (PEH) and pasture species (FOUR) in southern Québec (Canada). Results didn’t show deeper root profiles for trees in TBI. Profiles were superficial as commonly found for tree species grown in conventional plantations or in natural ecosystems. More than 95 % of fine roots were found in 25 cm and 45 cm depth for CHR and PEH, and in 35 cm for pasture. However, spatial separation exists between CHR and pasture fine roots systems as CHR allocate less fine roots in the top 10 cm of soil, and more between 10 cm et 30 cm. PEH fine roots didn’t show any adaption when intercropped with pasture and a high value fine root length density (FRLD) in top soil layer near tree trunk reduces pasture FRLD by 45 %, suggesting strong competition interaction for resources. Pasture yield analysis revealed biomass reduction near trees, particularly near PEH. However results of a principal component analysis indicates stronger negative effect of light reduction on pasture yield than the presence of tree fines roots. PEH, a fast growing species, have stronger impact than CHR on pasture yield but they will be harvested sooner and larger alleys should benefit the intercrop. This dynamic aspect of TBI systems is close to natural ecosystems and should be further investigated for future success.

In this thesis, I analys suburb- and housing planning and interior decoration carried out primarily in Stockholm between the 1930s and the 1950s. Functionalism, the overall concept of the period, has perhaps been interpreted in terms of ideological concepts, interpreted as "democratic" and as a progressive dividing line between the past and the future. I examine how housing and suburban planning in Sweden in the mid-20th century was affected by how housing and town planning related to that period's clear class boundaries and well-defined gender roles. I analyse both rhetoric and physical planning. Whether the architect had explicit ambitions to achieve spatial differentiation of socio-economic categories, how suburban planners dealt with their historical inheritance and the principles about categorisation and spatial separation. I also analyse how ideas of class, gender and spatial differentiation of family members affected the organisation and design of rooms in the housing planning of the mid-20th century. The general conclusion of the thesis as a whole is that ideas about class, sex and familial hierarchy were reflected in functionalist housing and interior decoration. The planned suburbs in Stockholm involved explicit strategies for differentiating population categories in different suburbs. The planned suburbs, which were regarded as paradigmatic cases for the suburban planning of the period, involved explicit strategies for differentiating population categories in different suburbs, a strategy that was concretised in physical suburban planning. Terraced housing in one area, småstugor in another, blocks of flats in a third, detached houses in a fourth. Sociological arguments justified this type of suburban planning. The emotional affinity between neighbours was considered to be better if the neighbours belong to the same socio economic category. Planned homes, which were regarded as paradigmatic cases for the housing planning of this period, involved explicit strategies for differentiating family members into different rooms, distinguishing between private and public rooms within the sphere of the home, a strategy that was concretised in physical housing planning. I analyse how the magazine's editorial content contributed to producing a middle-class housing ideal. A central aspect of modern housing planning and the debate in around 1930 was the launch of the home as an essentially private sphere. The editorial team behind the magazine Hem i Sverige launched the home as a reaction against the idea of the home as essentially a private sphere, with a clear spatial hierarchy and division between different family members, between private and public spheres. I examined the participation of the Nordiska Kompaniet department store in the 1930 Stockholm exhibition. As an influential commercial actor, the store's management had a strategy of combining consumption with both benefit and enjoyment, dreams, pastimes and goal-oriented purchases. The starting point for Nordiska Kompaniet's interior decoration approach was the organisation and content of the upper middle-class home. The drawing rooms, the dining room, the serving area, the homes with clear dividing lines between private and public sphere. Family structures and familial hierarchy were emphasised on the basis of the upper middle-class family's tradition. / Forskarskolan för estetiska vetenskaper

Les distributions spatiales des racines fines de Quercus rubra L. (CHR), Populus deltoides x nigra (DN3570) (PEH) et d’une culture fourragère (FOUR) ont été étudiées dans un système agroforestier de culture intercalaire (SCI) du sud du Québec (Canada). L’étude ne révèle pas d’enracinement plus profond des arbres en SCI, mais des profils superficiels à l’instar de nombreuses espèces d’arbres en plantations ou en milieu naturel. Une séparation spatiale existe entre les systèmes racinaires du FOUR et des CHR dont la densité relative selon la profondeur est plus faible que celle de la culture de 0 à 10 cm, mais plus élevée de 10 à 30 cm. Les PEH ne présentent pas d’adaptation racinaire et les hautes valeurs de densités de longueur racinaires (FRLD) de surface près du tronc entraînent une diminution de 45 % de la densité racinaire de surface du fourrage, suggérant une forte compétition pour les ressources du sol. L’étude du rendement agricole a d’ailleurs révélé des réductions de biomasse fourragère particulièrement près des PEH. Cependant, les résultats d’une analyse à composantes principales suggèrent un impact secondaire de la compétition racinaire sur le rendement agricole, et une plus grande importance de la compétition pour la lumière. L’impact des PEH à croissance rapide sur la culture est plus grand que celui du CHR. Cependant, ils seront récoltés plus rapidement et l’espace libéré favorisera la croissance de la culture intercalaire. Cet aspect dynamique des SCI les rapproche des écosystèmes naturels et devrait être réfléchi et approfondi pour leur succès futur. / Spatial distributions of fine roots were studied in a tree-based intercrop system (TBI) with Quercus rubra L. (CHR), Populus deltoides x nigra (DN3570) (PEH) and pasture species (FOUR) in southern Québec (Canada). Results didn’t show deeper root profiles for trees in TBI. Profiles were superficial as commonly found for tree species grown in conventional plantations or in natural ecosystems. More than 95 % of fine roots were found in 25 cm and 45 cm depth for CHR and PEH, and in 35 cm for pasture. However, spatial separation exists between CHR and pasture fine roots systems as CHR allocate less fine roots in the top 10 cm of soil, and more between 10 cm et 30 cm. PEH fine roots didn’t show any adaption when intercropped with pasture and a high value fine root length density (FRLD) in top soil layer near tree trunk reduces pasture FRLD by 45 %, suggesting strong competition interaction for resources. Pasture yield analysis revealed biomass reduction near trees, particularly near PEH. However results of a principal component analysis indicates stronger negative effect of light reduction on pasture yield than the presence of tree fines roots. PEH, a fast growing species, have stronger impact than CHR on pasture yield but they will be harvested sooner and larger alleys should benefit the intercrop. This dynamic aspect of TBI systems is close to natural ecosystems and should be further investigated for future success.