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Representations of concepts from multivariate statistics are studied using multilinear algebra. Applications are given to the analysis of seasonal multivariate time series. The first paper concerns a class of permutation matrices which are representations of permutation operators on tensor spaces. In the second paper, the derivation of moments and cumulants of Hilbert space valued random variabl
Many commercial web sites, as web stores, have recently experienced performance problems due to the growth of Internet trading. One way to improve a site’s performance during overload is to introduce admission control mechanisms. In this paper we develop and investigate two admission control schemes specifically for distributed commercial web sites. One of the schemes is request-based and the othe
OBJECTIVE: To determine moment arm lengths from seven knee muscles and the patellar tendon. The knee muscles were the biceps femoris, semitendinosus, semimembranosus, gracilis, sartorius, and the lateral and medial gastrocnemius muscles. DESIGN: The moment arms were calculated based on MRI measurements. BACKGROUND: Moment arm lengths of different muscles with respect to the joint centre of rotatio
Under 1680-talet trädde Sophia Elisabet Brenner fram som poet och blev snart känd och uppskattad för sina dikter vid olika tillfällen i livet. Tillfällesdiktningen var en flexibel genre som gav henne möjligheten att resonera om tidens aktuella frågor, till exempel kvinnans ställning i äktenskap och samhälle eller värderingen av det som var gammalt och fornt och det som var nytt. Hennes rykte spred
This paper traces the intellectual effects of an encounter between Stig Kanger and Donald Davidson -two very different philosophers working in two seemingly unconnected areas. Their meeting in Oslo 1979 led the latter to improve his influential theory of radical interpretation and gave the former an inspiration for a rather striking paradox in preference logic. But, as we show, the paradox can be
We test the hypothesis that the spread in the age-metallicity plot of the solar neighborhood is due to a mixture of stars belonging to kinematically different sub-populations of the Galactic disk, i.e., the thin and the thick disk. We use a kinematic subsample of similar to 600 stars from a sample of similar to 6000 dwarf and subgiant stars from the Hipparcos catalog. All of these stars have a ful
Following a brief discussion on aspects of visual appearance and roles respectively, two user studies are presented and discussed. Both focus on learner experiences and explore the reciprocal relation between visual appearance of virtual agents and their pedagogical roles. The paper concludes with some preliminary guidelines for the early stages of the design process of virtual pedagogical agents.
This paper illustrates a novel method to analyze artificial neural networks so as to gain insight into their internal functionality. To this purpose, the elements of a feedforward-backpropagation neural network, that has been trained to detect edges in images, are described in terms of differential operators of various orders and with various angles of operation.
This paper describes the modification of a wavelet based event detector for cardiac pacemakers with improved power efficiency. A previously published R-wave detector has been supplemented with a noise detector that operates in supervision mode, and automatically activates and deactivates parts of the detector. Simulation results show that the power consumption in an ASIC core can be reduced by mor
Indium arsenide nanowires are grown directly on silicon substrates (see figure and cover) using a method employing self-assembled organic coatings to create oxide-based growth templates. High-performance materials, such as InAs, could have great impact on future nanoelectronics if integrated with Si, but integration has so far been hard to realize with other methods.
The production of methane via anaerobic digestion of agricultural residues and industrial wastewater would benefit society by providing a clean fuel from renewable feedstocks. This would reduce the use of fossil-fuel-derived energy and reduce environmental impact, including global warming and pollution. Limitation of carbon dioxide and other emissions through emission regulations, carbon taxes, an
