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This paper describes an attempt to apply linear optimal control theory to computer control of an industrial process. The applicability of the theory is discussed. Particular attention is given to the problem of obtaining a mathematical model of process dynamics and disturbances. Results of actual measurements as well as results from on-line control experience are presented.
Standard lot-sizing models are often not directly applicable in practice. Different assumptions in lot-sizing models and the extent to which these assumptions are valid in various practical situations are discussed. Practitioners also tend to prefer simple standard methods even for complex problems, which means that adjustment of the lot sizes may be desirable. The ways in which such adjustments c
Aim:To study the effects of hypobaric pressure chamber exposure on the cochlear frequency selectivity of subjects with monaural, fluctuating, low-frequency hearing loss, such as occurs in Ménière's disease.Methods:We used a hypobaric pressure chamber to create relative underpressure in the ear canal, in order to impose positive pressure gradients on the inner ear. Psychophysical tuning curves, tra
A time transformation technique for Nambu–Poisson systems is developed, and its structural properties are examined. The approach is based on extension of the phase space P into P¯ = P×R, where the additional variable controls the time-stretching rate. It is shown that time transformation of a system on P can be realised as an extended system on P¯, with an extended Nambu–Poisson structure. In addi
A method to determine the dynamic load between two rotating elastic helical gears is presented. The stiffness of the gear teeth is calculated using the finite element method and includes the contribution from the elliptic distributed tooth load. To make sure that the new incoming contacts which are the main excitation source are properly simulated, the necessary deformation of the gears is determi
This paper discusses some trends in critical theory and activist aesthetics in contemporary feminist performing arts in Sweden. The 2000s have witnessed at least two “turns” in feminist theory, namely the affective turn and the social, or as it is called here, the solidarity turn. The status of poststructuralist theory has been widely debated and Marxist, class-based analyses have returned to the
Popular Abstract in Swedish Avhandlingens övergripande syfte var att under ett ettårigt nationellt projekt för utveckling av geriatrisk rehabilitering, Rehab Äldre 300, redogöra för förändringar av kvaliteten inom geriatrisk rehabilitering samt att beskriva denna utifrån administrativ-, personal- och vårdtagar-nivå. Vidare var syftet att under utvärderingsperioden beskriva förändringar av vårdtagaThe overarching aim of this thesis was to report changes in the quality of geriatric rehabilitation as perceived by administration, caregivers, and clients during a one-year period of a Swedish governmental venture of development in geriatric rehabilitation. Further aims were to describe changes in clients’ prevalence of symptoms, ADL dependence, subjective well-being in a one-year follow-up and t
Objective: To evaluate the efficacy of individual trauma-focused cognitive-behavioral therapy (CBT) for treating posttraumatic stress disorder (PTSD) in children and young people. Method: Following a 4-week symptom-monitoring baseline period, 24 children and young people (8Y18 years old) who met full DSM-IV PTSD diagnostic criteria after experiencing single-incident traumatic events (motor vehicle
A full description of the entire system room-wall-room in a theoretical model for sound insulation is still today too computation intensive, implying that the higher frequencies cannot be studied. Some simplifications must thus be introduced. The simplification proposed in the present paper is to replace the rooms with wave-guides, i.e. infinity long rooms. The model then reduces to the (more or l
Many of society’s critical infrastructures, such as power supply, telecommunications, and transportation, have become increasingly interconnected. While this gives rise to increased efficiency, tighter connections also invites increased vulnerability and the risks of cascading failures. Moreover, at the same time as many of these vital systems have become increasingly dependent on one another, the
A common method for comparing the result of different global circulation models (GCMs) under different emission scenarios is to study global climate response variables, such as mean temperature. An interesting alternative measure of climate sensitivity is to study the biosphere’s response to the different climate scenarios. The Lund-Postdam-Jena (LPJ) global vegetation model and its extension LPJ-
