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Feedback in server systems has during last years gained much interest in order to fulfill still increasing demands on performance and optimization regarding, for example, quality of service (QoS) requirements. In this paper we investigate a feedback–based prediction scheme for controlling a single server queue. This control structure has the benefit over other previously suggested control structur
In a previous paper, we showed how classical ideas for dynamicprogramming in discrete networks can be adapted to hybrid systems. The approach is based on discretization of the continuous Bellman inequality which gives a lower bound on the optimal cost. The lower bound is maximized by linear programming to get an approximation of the optimal solution.In this paper, we apply ideas from infinite-dime
An introduction to the Swedish translation of St. Augustine's De doctrina christiana.
Many studies focusing on the design activity use the interview technique as a part of their investigation. Methodological discussions about the interview setting as the locus of a social interaction between the interviewer and the respondent and its implications for the interpretation of the obtained data are nevertheless rarely found in publications within our design community. Part I of this pub
Canonical bases, also called SAGBI bases, for subalgebras of the non-commutative polynomial ring are investigated. The process of subalgebra reduction is defined. Methods, including generalizations of the standard Gröbner bases techniques, are developed for the test whether bases are canonical, and for the completion procedure of constructing canonical bases. The special case of homogeneous subalg
During B lymphocyte development, the transcriptional activity of the IgH locus is subject to spatial and temporal changes. The 3' enhancer (3'E) has been suggested to play an important role in regulation of immunoglobulin gene expression late in B cell development. We have investigated, using transgenic mice, the role of the 3'E in regulating Ig gene expression. Mice harbouring a rearranged IgH ge
Popular Abstract in Swedish Användningen av konstgjorda material för temporärt och permanent bruk, t.ex katetrar, skruvar, ledproteser är numera väl etablerad inom human- medicinen. Dessa sk biomaterial kan emellertid predisponera till proppbildning, inflammatoriska vävnadsreaktioner och infektioner i omgivande vävnad, ledande till svåra komplikationer, såsom blod- förgiftning, passagestopp samt pResident skin micro-organisms such as S. epidermidis and other coagulase-negative staphylococci (CoNS), are by far the most common causes of biomaterial-associated infections. These micro-organisms often exhibit surface adhesins that specifically bind serum and tissue proteins adsorbed to implanted biomaterials. The aim of this study was to extend our knowledge about such adhesins produced by CoNS
Eukaryotic cells possess sensitive systems for the detection of microbes and microbial-derived products. Bacteria-eukaryotic cells contact triggers several signaling pathways, most of which are dependent on protein-protein interactions followed by phosphorylation, leading to activation of defense mechanisms. Yersinia bacteria have evolved different strategies to interfere with eukaryotic host defe
Popular Abstract in Swedish Immunsystemet består av en specifik och en ospecifik del som samarbetar när ett immunsvar sätts igång. Den specifika delen utgörs av T och B celler som med specifika ytreceptorer, så kallade antigen-receptorer, känner igen och aktiveras av främmande ämnen (antigen). För att T celler skall aktiveras av antigen, krävs det att dendritiska celler inom den ospecifika delen aImmunological self-tolerance is a state of the whole organism where deleterious responses are either avoided or regulated. Breaking of immunological tolerance will lead to autoimmune disease or chronic inflammatory conditions. T cell maturation in the thymus generates a peripheral T cell pool with an enormous TCR repertoire, from which specific T cells are selected and activated upon encounters wi
Popular Abstract in Swedish När vi blir infekterade av virus eller bakterier (patogener) hjälper olika delar av vårt immunförsvar till att försvara oss från dem. Vår hud, slemhinnor, magsyra och vissa immunceller hjälper till att ospecifikt och snabbt hindra patogenerna från att angripa oss och ofta räcker detta för att infektionen skall klaras av. Men det finns en del till av vårt immunförsvar soT lymohocytes (T cells) and B lymphocytes (B cells) are important effector cells of the adaptive immune system. In response to infections, B cells are activated and produce antibodies against specific antigens. There are two types of T cells, cytotoxic T cells that kill cells infected with bacteria or viruses, and helper T (Th) cells that help B cells produce antibodies by secreting cytokines as w
The sound transmission in double walls at low frequencies is studied using a detailed geometric model, based on FEM. The model simulates the experiments carried out to determine the sound reduction index of the wall. The wall properties effect on the sound transmission loss is investigated and also how the sound reduction is affected by the dimensions of the connecting rooms.
This paper describes a system to create animated 3D scenes of car accidents from reports written in Swedish. The system has been developed using news reports of varying size and complexity. The text-to-scene conversion process consists of two stages. An information extraction module creates a tabular description of the accident and a visual simulator generates and animates the scene. We first des
This paper addresses Test Application Time (TAT)reduction for core-based 3D Stacked ICs (SICs). Applyingtraditional test scheduling methods used for non-stacked chiptesting where the same test schedule is applied both at wafer testand at final test to SICs, leads to unnecessarily high TAT. This isbecause the final test of 3D-SICs includes the testing of all thestacked chips. A key challenge in 3D-
Dry stacked light weight concrete block masonry is increasingly used due to its superior productivity compared to standard block masonry. Low bending capacity parallel to the bed joints is however a major drawback. This paper presents the results of an experimental study which has been carried out to improve the bending capacity of dry stacked lightweight concrete block masonry. The effects of fol
The principal noise source for a jet engine is associated with the jet exhaust. The acoustical field that is generated by a jet engine before the take-off is considered. The turbulent jet and the mixing of the hot exhaust gas with the cold surrounding air forms an acoustical source. The compressible Navier-Stokes equations describe both flow field as well as sound generation. The acoustic theory u
We examined the effect of 17alpha-ethinylestradiol on immunity of the Western fence lizard, Sceloporus occidentalis. Injection of 17alpha-ethinylestradiol resulted in dose-dependent suppression of peripheral blood leukocyte levels as determined by cell counts, whereas total spleen cell levels were decreased only at higher doses of 17alpha-ethinylestradiol. In contrast, spleen cell proliferation wa
Recent progress on the nature of short-duration gamma-ray bursts has shown that a fraction of them originate in the local Universe. These systems may well be the result of giant flares from soft gamma-repeaters (highly magnetized neutron stars commonly known as magnetars). However, if these neutron stars are formed via the core collapse of massive stars then it would be expected that the bursts sh
