Sökning: "last 2000 year"
Visar resultat 1 - 5 av 44 avhandlingar innehållade orden last 2000 year.
1. Hilbert space frames and bases : a comparison of Gabor and wavelet frames and applications to multicarrier digital communications
Sammanfattning : Several signal processing applications today are based on the use of different transforms. The signals under consideration are written as a linear combination (or series) of some predefined set of functions. Traditionally, orthogonal bases have been used for this purpose, for example, in the discrete Fourier transform. LÄS MER
2. Empirical essays on financial markets, firms, and derivatives
Sammanfattning : This thesis consists of five self-contained studies. The first three investigate the impact of derivatives on the markets for the underlying assets, while the other two examine how and why firms use derivatives. A summary of each of the five studies follows. LÄS MER
3. Studies of the prevalence of asthma and allergy i Costa Rican school children
Sammanfattning : Objectives The main aims of our study were: To determine the prevalence and severity of asthma, rhinitis, rhinoconjuntivitis and dermatitis in school children from Costa Rica (I, IV, V) to make international comparisons and to identify possible risk factors associated with these conditions (II, III).Methods Using nationally representative samples of 9931 school children from Costa Rica during the last 10 years (from 1989 to 1998) we have performed three studies. LÄS MER
4. The Swedish Knee Arthroplasty Register. Validity and Outcome
Sammanfattning : The Swedish Knee Arthroplasty Register (SKAR) was initiated in 1975 to prospectively follow patients operated on with knee arthroplasty. With revisions utilized as the end-point in survival analyses, it is of importance that all revisions of included patients are reported. LÄS MER
5. Leukaemic relapse after allogeneic haematopoietic stem cell transplantation and the use of the graft-versus-leukaemia effect
Sammanfattning : Survival after allogeneic haematopoietic stem cell transplantation (HSCT) has improved over the last decades due to improvements in immunosuppressive regimens and supportive care. Today the major risk of treatment failure is recurrent leukaemia, a risk which has stayed relatively constant over the years. LÄS MER