| 1. |
- Öwall, Viktor
(author)
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Synthesis of Controllers from a Range of Controller Architectures
- 1994
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Doctoral thesis (other academic/artistic)abstract
- An algorithm specific digital signal processor is a powerful alternative to a general purpose signal processor for demanding specifications such as high throughput, low power, small size, etc. These properties are achieved as the processor architecture is tailored to the algorithm as opposed to the general purpose architecture which must suit a wide range of algorithms. The increased performance is traded for reduced flexibility of the final circuit and an increased design effort. Consequently powerful CAD-tools are needed to decrease the design effort. This thesis presents COMA, a CAD-tool for synthesis of controllers suitable for a wide range of digital signal processing algorithms and application fields. COMA synthesizes a complete controller with all modules and interconnection specifications. COMA has been developed with the intention of being used by an active designer where his knowledge, skills, and experience is best utilized. An automated synthesis process can be performed but is preferably refined to a competitive solution using designer interaction before a circuit is fabricated. The main reason for designing an algorithm specific digital signal processors is the possibility to use an architecture dedicated to the algorithm. Consequently, COMA supports arbitrary datapath architectures and does not impose any restrictions. This is crucial in order to fully exploit the advantages of an algorithm specific design. Results presented in this thesis and the discussion regarding controller architectures show that different controller architectures are suitable for different algorithms and different implementation techniques of the fabricated circuit. Thus, COMA can synthesize a range of controller architectures suitable for these different needs. This approach, I believe, is unique for COMA. Standard controller architectures have been modified to suit application specific digital signal processing design and new solutions have been developed. Using COMA complex algorithm specific digital signals processors for a wide range of applications can be designed with a considerable reduction in design effort compared to a hand made design.
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| 2. |
- Bhandary, Sumanta, et al.
(author)
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Quasiperiodic Van der Waals Heterostructures of Graphene and Hexagonal Boron Nitride
- 2022
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In: Physica status solidi. B, Basic research. - : John Wiley & Sons. - 0370-1972 .- 1521-3951. ; 259:2
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Journal article (peer-reviewed)abstract
- Advancement toward opening a bandgap at the Dirac point induced by symmetry breaking paved the way to realize 2D heterostructures with graphene and hexagonal boron nitride (h-BN). An alternate arrangement of graphene and h-BN layers in a 3D stacking can tune the bandgaps of these composites depending on the position of B and N atoms with respect to C atoms of graphene. Herein, a unique possibility of arranging graphene and h-BN atomic layers in a quasiperiodic Fibonacci sequence to study the possibilities of controlling the electronic properties of these heterostructures is explored. Density functional theory calculations combined with van der Waals corrections reveal that these quasiperiodic heterostructures are more stable than normal periodic stacking of monolayers of graphene and h-BN. Moreover, for certain arrangements of atomic layers, sizeable bandgaps can be obtained.
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| 3. |
- Drake, Isabel, et al.
(author)
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Scoring models of a diet quality index and the predictive capability of mortality in a population-based cohort of Swedish men and women.
- 2012
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In: Public Health Nutrition. - 1475-2727. ; :May 29, s. 1-11
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Journal article (peer-reviewed)abstract
- OBJECTIVE: To examine how different scoring models for a diet quality index influence associations with mortality outcomes. DESIGN: A study within the Malmö Diet and Cancer cohort. Food and nutrient intakes were estimated using a diet history method. The index included six components: SFA, PUFA, fish and shellfish, fibre, fruit and vegetables, and sucrose. Component scores were assigned using predefined (based on dietary recommendations) and population-based cut-offs (based on median or quintile intakes). Multivariate Cox regression was used to model associations between index scores (low, medium, high) and all-cause and cause-specific mortality by sex. SETTING: Malmö, the third largest city in Sweden. SUBJECTS: Men (n 6940) and women (n 10 186) aged 44-73 years. During a mean follow-up of 14·2 years, 2450 deaths occurred, 1221 from cancer and 709 from CVD. RESULTS: The predictive capability of the index for mortality outcomes varied with type of scoring model and by sex. Stronger associations were seen among men using predefined cut-offs. In contrast, the quintile-based scoring model showed greater predictability for mortality outcomes among women. The scoring model using median-based cut-offs showed low predictability for mortality among both men and women. CONCLUSIONS: The scoring model used for dietary indices may have a significant impact on observed associations with disease outcomes. The rationale for selection of scoring model should be included in studies investigating the association between dietary indices and disease. Adherence to the current dietary recommendations was in the present study associated with decreased risk of all-cause and cause-specific mortality, particularly among men.
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| 4. |
- Borthwick, Verity, 1983-, et al.
(author)
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Post-deformational annealing at the subgrain scale : Temperature dependent behaviour revealed by in-situ heating experiments on deformed single crystal halite
- 2010
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In: Journal of Structural Geology. - : Elsevier BV. - 0191-8141 .- 1873-1201. ; 32:7, s. 982-996
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Journal article (peer-reviewed)abstract
- The dynamics of substructures, which encompass all structures present at the subgrain-scale, were investigated by static, in-situ annealing experiments. Deformed, single crystal halite was annealed inside a scanning electron microscope at temperatures between 280-470 ºC. Electron backscatter diffraction maps provided detailed information about crystallographic orientation changes. Three temperature dependent regimes were distinguished based on boundary misorientation changes. In regime I (280-300 ºC) some low angle boundaries (LABs), i.e. with 1º-15º misorientation, increase in misorientation angle, while others decrease. In regime II (~300 ºC) all LABs undergo a decrease in misorientation angle. Regime III (>300 ºC) is defined by enhancement of the subgrain structure as remaining LABs increase and some undergo a rotation axis change. Throughout regimes I and II, new LABs develop, subdividing subgrains. LABs could be divided into four categories based on annealing behaviour, orientation and morphology. We suggest that these observations can be directly related to the mobility and activation temperature of climb of two dislocation groups introduced during deformation. Therefore, with in-depth investigation of a substructure with known deformation geometry, we can infer ratios of dislocation types and their post-deformation and post-annealing location. These can potentially be used to estimate the post-deformational annealing temperature in crystalline materials.
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