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Leveraging network and traffic measurements for content distribution and interpersonal communication services with sufficient quality

In this paper, we discuss research problems for enabling content distribution and supporting real-time interpersonal communication services (e.g. voice and video) over best effort networks with sufficient quality. We take a practical view of content distribution and quality, and this is the reason for the term “sufficient”. We argue that the understanding of quality as perceived by the user is a k

Läxhjälp ett hån mot lärarnas kompetens

Läxhjälp bör bygga på att det är kvalificerad personal som svarar för verksamheten. I debatten om rut-avdrag har två viktiga frågor inte ställts: 1. Varför har svenska skolan hamnat i en situation av sviktande måluppfyllelse? 2. Varför ska de som behöver extra stöd, oberoende av vilken nivå de ligger på studiemässigt, inte få den mest kvalificerade hjälpen, det vill säga utbildade lärare?

Allergy to methyltetrahydrophthalic anhydride in epoxy resin workers

One hundred and forty four current and 26 former workers in a plant producing barrels for rocket guns from an epoxy resin containing methyltetrahydrophthalic anhydride (MTHPA; time weighted average air concentration up to 150 uglm') were studied. They showed higher frequencies of work related symptoms from the eyes (31 v 0%; p < 0-001), nose (53 v 9%; p < 0-001), pharynx (26 v 6%; p < 0-01), and a

Fire Safety Risk Analysis of a Health Care Facility

A methodology for deriving individual risk to people in a health care facility due to fire, is presented. The risk is expressed by the First Order Second Moment reliability index ß. The evacuation time for the patients is compared to the time to untenable conditions arise. Subjecting variables to uncertainty results in a reliability index value for the escape time margin. The influence on reliabil

User friendly bicycle helmet for commuters

The number of adult bicycle helmet users in Sweden has stayed over the years relatively stable around 20 % [1]. In Europe the number of helmet users varies between 1 and 40 % depending on country. Research has shown that the use of helmet considerably diminishes head injuries in the case of traffic accidents [2]. In spite of that it is not fully clear what are the main factors why only a small num

Level Crossing Investigation of the Hyperfine Structure of Bi209 in the 6p^(2)(^(3)P_(0)) 6d^(2)D_(3/2) and 6p^(2)(^(3)P_(1)) 7s^(4)P_(3/2) Levels of the Bi I Spectrum

The level crossing method was used to measure the hyperfine structure of Bi 209 in the 6 p 2 ( 3 P 0 )6 d 2 D 3/2 and 6 p 2 ( 3 P 1 )7 s 4 P 3/2 levels of the Bi I spectrum. For the magnetic dipole and the electric quadrupole interaction constants a and b the following values were obtained: | a (6 p 2 ( 3 P 0 ) 6 d 2 D 3/2 )| = 128.0(0.6) g J /-0.79 MHz | b (6 p 2 ( 3 P 0 ) 6 d 2 D 3/2 )| = 58(4)