| 1. |
- Ahmed, Bestoun S., 1982-, et al.
(författare)
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Optimum Design of (PID mu)-D-lambda controller for an automatic voltage regulator system using combinatorial test design
- 2016
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Ingår i: PLOS ONE. - : PUBLIC LIBRARY OF SCIENCE. - 1932-6203. ; 11:11
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Tidskriftsartikel (refereegranskat)abstract
- Combinatorial test design is a plan of test that aims to reduce the amount of test cases systematically by choosing a subset of the test cases based on the combination of input variables. The subset covers all possible combinations of a given strength and hence tries to match the effectiveness of the exhaustive set. This mechanism of reduction has been used successfully in software testing research with t-way testing (where t indicates the interaction strength of combinations). Potentially, other systems may exhibit many similarities with this approach. Hence, it could form an emerging application in different areas of research due to its usefulness. To this end, more recently it has been applied in a few research areas successfully. In this paper, we explore the applicability of combinatorial test design technique for Fractional Order (FO), Proportional-Integral-Derivative (PID) parameter design controller, named as FOPID, for an automatic voltage regulator (AVR) system. Throughout the paper, we justify this new application theoretically and practically through simulations. In addition, we report on first experiments indicating its practical use in this field. We design different algorithms and adapted other strategies to cover all the combinations with an optimum and effective test set. Our findings indicate that combinatorial test design can find the combinations that lead to optimum design. Besides this, we also found that by increasing the strength of combination, we can approach to the optimum design in a way that with only 4-way combinatorial set, we can get the effectiveness of an exhaustive test set. This significantly reduced the number of tests needed and thus leads to an approach that optimizes design of parameters quickly.
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| 2. |
- Andersson, Matilda L., et al.
(författare)
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Linking behavioural type with cannibalism in Eurasian perch
- 2021
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Ingår i: PLOS ONE. - : Public Library Science. - 1932-6203. ; 16:12
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Tidskriftsartikel (refereegranskat)abstract
- The propensity to kill and consume conspecifics (cannibalism) varies greatly between and within species, but the underlying mechanisms behind this variation remain poorly understood. A rich literature has documented that consistent behavioural variation is ubiquitous across the animal kingdom. Such inter-individual behavioural differences, sometimes referred to as personality traits, may have far-reaching ecological consequences. However, the link between predator personality traits and the propensity to engage in cannibalistic interactions remains understudied. Here, we first quantified personality in Eurasian perch (Perca fluviatilis), measured as activity (time spent moving) and sociability (time spent near conspecifics). We then gave perch of contrasting behavioural types the option to consume either conspecific or heterospecific (roach, Rutilus rutilus) prey. Individual perch characterized by a social-active behavioural phenotype (n = 5) selected roach before being cannibalistic, while asocial-inactive perch (n = 17) consumed conspecific and heterospecific prey evenly. Thus, asocial-inactive perch expressed significantly higher rates of cannibalism as compared to social-active individuals. Individual variation in cannibalism, linked to behavioural type, adds important mechanistic understanding to complex population and community dynamics, and also provides insight into the diversity and maintenance of animal personality.
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| 3. |
- Anker-Hansen, Camilla, et al.
(författare)
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Informal caregivers and assistive technology in Norwegian nursing homes
- 2022
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Ingår i: PLOS ONE. - : Public Library of Science (PLoS). - 1932-6203. ; 17:10
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Tidskriftsartikel (refereegranskat)abstract
- Aim To explore informal caregivers’ experiences and perspectives concerning assistive technology (AT) in two nursing homes, through the conceptual lens of person-centredness. Background The integration and use of AT and a person-centred approach to care are political intentions within healthcare services, both internationally and in Norway. In nursing homes, informal caregivers are often collaborators with the staff, and can be important partners concerning the implementation of AT in a person-centred way. However, there is little knowledge about the informal caregivers’ perspectives on the use of AT in nursing homes, or of whether or how they are included in the integration and use of AT. Methods The study had a qualitative design and comprised eleven informal caregivers of residents in two nursing homes in Norway. In-depth interviews were used for data collection. The data were analysed using content analysis. COREQ reporting guidelines were applied to ensure comprehensive reporting. Results Emerging themes highlighted the slow-going transition from old to new technology, and how the informal caregivers experienced that AT both promoted and degraded the dignity of their family members. Informal caregivers were positive to the use of technology, but have sparse knowledge and information about ATs in the nursing homes. They express a desire for AT to increase activity and safety, which promotes dignity, quality of life, and quality of the care for their family member. The informal caregivers want their family member to be seen, heard, and to get assistance on their own terms, even with regard to technology. Conclusion Before AT can be implemented, informal caregivers need to be informed and listened to and included in the processes. Through their stories, one can form an idea of how important a person-centred approach is to contributing to individually tailored and introduced AT in collaboration with the informal caregivers.
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| 4. |
- Bortes, Cristian, et al.
(författare)
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Health problems during childhood and school achievement : Exploring associations between hospitalization exposures, gender, timing, and compulsory school grades
- 2018
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Ingår i: PLOS ONE. - San Fransisco, CA, USA : Public Library Science. - 1932-6203. ; 13:12, s. 1-14
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Tidskriftsartikel (refereegranskat)abstract
- Aims To investigate while accounting for health at birth 1) associations between health problems during childhood, measured as hospitalizations, and school achievement in the final year of compulsory school, measured as overall grade points and eligibility for upper secondary education, 2) if and how gender moderates the association between health problems and school achievement, 3) if and how the timing of a health problem during childhood is associated with later school achievement. Methods Analyzes were performed on a population-based cohort (n = 115 196) born in 1990 in Sweden (51.3% boys, 48.7% girls) using data from several national registries. Multiple linear regression and logistic regression were used to analyze associations between study variables. Results Overall grade points and eligibility for continuation to upper secondary school were lower for individuals exposed to hospitalizations. Only the association between hospitalizations and overall grade points was moderated by gender and only for ages 13-16 years. Exposure close to actual grading had worst outcomes. Conclusions Health problems, measured through hospitalizations, was significantly associated with lower school achievements among Swedish children. Girls exposed to health problems requiring hospitalizations had relatively poorer school achievements as compared to boys. Health problems requiring hospitalization during junior high school had the greatest negative association with final achievement at compulsory school.
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| 8. |
- Brönmark, Christer, et al.
(författare)
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Costs of inducible defence along a resource gradient.
- 2012
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Ingår i: PloS one. - : Public Library of Science (PLoS). - 1932-6203. ; 7:1
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Tidskriftsartikel (refereegranskat)abstract
- In addition to having constitutive defence traits, many organisms also respond to predation by phenotypic plasticity. In order for plasticity to be adaptive, induced defences should incur a benefit to the organism in, for example, decreased risk of predation. However, the production of defence traits may include costs in fitness components such as growth, time to reproduction, or fecundity. To test the hypothesis that the expression of phenotypic plasticity incurs costs, we performed a common garden experiment with a freshwater snail, Radix balthica, a species known to change morphology in the presence of molluscivorous fish. We measured a number of predator-induced morphological and behavioural defence traits in snails that we reared in the presence or absence of chemical cues from fish. Further, we quantified the costs of plasticity in fitness characters related to fecundity and growth. Since plastic responses may be inhibited under limited resource conditions, we reared snails in different densities and thereby levels of competition. Snails exposed to predator cues grew rounder and thicker shells, traits confirmed to be adaptive in environments with fish. Defence traits were consistently expressed independent of density, suggesting strong selection from predatory molluscivorous fish. However, the expression of defence traits resulted in reduced growth rate and fecundity, particularly with limited resources. Our results suggest full defence in predator related traits regardless of resource availability, and costs of defence consequently paid in traits related to fitness.
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| 10. |
- Carver, Rebecca Bruu, et al.
(författare)
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Young Adults' Belief in Genetic Determinism, and Knowledge and Attitudes towards Modern Genetics and Genomics : The PUGGS Questionnaire
- 2017
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Ingår i: PLOS ONE. - : Public Library of Science (PLoS). - 1932-6203. ; 12:1
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Tidskriftsartikel (refereegranskat)abstract
- In this paper we present the development and validation a comprehensive questionnaire to assess college students' knowledge about modern genetics and genomics, their belief in genetic determinism, and their attitudes towards applications of modern genetics and genomic-based technologies. Written in everyday language with minimal jargon, the Public Understanding and Attitudes towards Genetics and Genomics (PUGGS) questionnaire is intended for use in research on science education and public understanding of science, as a means to investigate relationships between knowledge, determinism and attitudes about modern genetics, which are to date little understood. We developed a set of core ideas and initial items from reviewing the scientific literature on genetics and previous studies on public and student knowledge and attitudes about genetics. Seventeen international experts from different fields (e.g., genetics, education, philosophy of science) reviewed the initial items and their feedback was used to revise the questionnaire. We validated the questionnaire in two pilot tests with samples of university freshmen students. The final questionnaire contains 45 items, including both multiple choice and Likert scale response formats. Cronbach alpha showed good reliability for each section of the questionnaire. In conclusion, the PUGGS questionnaire is a reliable tool for investigating public understanding and attitudes towards modern genetics and genomic-based technologies.
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