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Tailbiting codes are error correcting codes and can be used in digital transmission systems. They are obtained by terminating convolutional codes into block codes. This thesis consists of an introduction to convolutional and tailbiting codes, and the Papers A--G that include the main results. In Paper A, the error correcting capability of tailbiting codes is described via the active distances for
Författat kapitel: September - november 2001; December - februari 2002; September - november 2002; September - november 2003; September - november 2004; September - november 2005; September - november 2006; September - november 2007
“Diversify or die” is a recurring and rather dramatic call for organizations to recruit, retain and manage a demographically diverse workforce, advocated by the business case for diversity, also known as diversity management philosophy. Diversity management places diverse social identities at the heart of organizational success and has gained much attention from management consultants and managers
Popular Abstract in Swedish I och med upptäckten av antibiotika i första halvan av 1900-talet så kan flera tidigare dödliga infektionssjukdomar botas. Så är längre dock inte alltid fallet, en viss nivå av antibiotikaresistans har upptäckts hos flera stammar av kliniskt viktiga bakterier. Problemet med antibiotikaresistans har till viss del lösts med modifiering av existerande antibiotika, vilket dWith the discovery of antibiotics, several diseases that were previously lethal is today readily cured, or so we thought. Some degree of resistance to one or several antibiotics can be found among many strains of clinical important bacteria. The problem has been somewhat kept at bay for the last few decades by altering already existing antibiotics, and thereby prolonging their usage. It is clear t
A statistical analysis of low-density convolutional (LDC) codes is performed. This analysis is based on the consideration of a special statistical ensemble of Markov scramblers and the solution to a system of recurrent equations describing this ensemble. The results of the analysis are lower bounds for the free distance of the codes and upper bounds for the maximum likelihood decoding error probab
Spatially coupled regular LDPC code ensembles have outstanding performance with belief propagation decoding and can perform close to the Shannon limit. In this paper we investigate the suitability of coupled regular LDPC code ensembles with respect to rate-flexibility. Regular ensembles with good performance and low complexity exist for a variety of specific code rates. On the other hand it can be
The tensile and compressive properties of acrylic bone cement containing iohexol acetate (IHA) were investigated. The IHA monomer was prepared with 4 g of IHA dissolved in 20 ml of palacos monomer, later mixed with 36 g of palacos powder. The ultimate tensile strength (UTS) and ultimate tensile strain of IHA cement was compared with Palacos R. The IHA cement show significantly higher UTS and ultim
It is reasonable to consider that those who arranged the material accoutrements of mortuary practices, i.e. the burial, were making a more or less conscious statement about cultural identity. At least we archaeologists usually assume this to be so. An interesting case can be found in the mortuary practices ascribed to the Battle Axe culture from the later Middle Neolithic1 (2800–2350 cal BC) in so
Popular Abstract in Swedish Hjärtsvikt är ett sjukdomstillstånd som blir allt vanligare i vårt samhälle i takt med att människor blir äldre och att man idag räddar allt fler människor till livet efter hjärtinfarkt. Som namnet antyder sviktar hjärtat, det kan inte pumpa ut den mängd blod som krävs för att tillgodose kroppens behov av syre och näringsämnen. Sjukdomen indelas i olika svårighetsgraderCongestive heart failure is accompanied with increased circulatory levels of several vasoregulatory neurotransmitters and hormones which affect the outcome of this disease. In this thesis the blood levels of several vasoactive peptides in humans with congestive heart failure and their effects on the vasculature by the use of an animal model of heart failure were studied. Patients with congestive
Abstract not available
Due to the increasing power requirement and the limited available space in vehicles, placing the heat exchanger at the roof or the underbody of vehicles might increase the possibility to handle the cooling requirement. A new configuration of the heat exchanger has to be developed to accommodate with the position change. In this paper, a countercurrent heat exchanger is developed for position on th
Abstract in UndeterminedThe make-or-buy decision is analyzed in a simple framework combining contractual incompleteness with the existence of an imperfect but contractible performance measure. Contractual incompleteness gives rise to two regimes, identified with make and buy. The performance measure on which comprehensive contracts can be written is imperfect in the sense of being subject to manip
