Description:
A class of convexification and concavification methods are proposed for solving some classes of non-monotone optimization problems. It is shown that some classes of non-monotone optimization problems can be converted into better structured optimization problems, such as, concave minimization problems, reverse convex programming problems, and canonical D.C. programming problems by the proposed convexification and concavification methods. The equivalence between the original problem and the converted better structured optimization problem is established.
Description:
This article evaluates the effect of randomly distributed, residential single-phase rooftop photovoltaic systems in the low voltage residential networks, during short-circuit faults on the overhead lines. The important parameters such as the fault current, the current sensed at the distribution transformer secondary, and the voltage profile along the feeder during the fault are examined. A sensitivity analysis is carried out in which the rating and location of the photovoltaic systems in the feeder, as well as the fault location and type, are the considered variables. Moreover, to demonstrate the effect of multiple photovoltaic systems with different ratings and penetration levels when distributed unequally among three phases of the network, a stochastic analysis is carried out. The article summarizes the outcomes of these two analyses to provide a better understanding of the impact of single-phase rooftop photovoltaic systems on the residential feeders during short-circuit faults.
Description:
This article evaluates the effect of randomly distributed, residential single-phase rooftop photovoltaic systems in the low voltage residential networks, during short-circuit faults on the overhead lines. The important parameters such as the fault current, the current sensed at the distribution transformer secondary, and the voltage profile along the feeder during the fault are examined. A sensitivity analysis is carried out in which the rating and location of the photovoltaic systems in the feeder, as well as the fault location and type, are the considered variables. Moreover, to demonstrate the effect of multiple photovoltaic systems with different ratings and penetration levels when distributed unequally among three phases of the network, a stochastic analysis is carried out. The article summarizes the outcomes of these two analyses to provide a better understanding of the impact of single-phase rooftop photovoltaic systems on the residential feeders during short-circuit faults.
Description:
Animals Australia focuses on making animal welfare issues visible to consumers so as to direct consumer behaviour and invoke everyday activism, an objective integral to their Make it Possible' campaign. In this paper, we primarily explore the claimed and practised identity of everyday or mainstream animal activists. This is an identity that, whilst partially and communally elaborated and affirmed online (in the online Animals Australia community), is enacted more commonly through personal and familial everyday actions such as shopping, cooking and eating than it is through such public actions as explicitly advocating or demonstrating for better welfare standards for animals involved in factory farming. A discourse analysis was conducted of 2198 posts from October 2013 to January 2014 to analyse contributors' accounts of their feelings (notably their gut reactions) and reasons for pledging, as well as to examine how contributors' accounts of their everyday practices might be understood as the development of a voice for these voiceless animals'. Overall, then, our analysis has shown supporters, participants and/or consumers who support the Make it Possible' campaign self-select into and identify themselves in terms of four overlapping frames: being vegan or vegetarian, shopping for change, personal activism and public activism and advocacy. This paper contributes to the debate concerning intersectional activism within the food activism movement.
Description:
Animals Australia focuses on making animal welfare issues visible to consumers so as to direct consumer behaviour and invoke everyday activism, an objective integral to their Make it Possible' campaign. In this paper, we primarily explore the claimed and practised identity of everyday or mainstream animal activists. This is an identity that, whilst partially and communally elaborated and affirmed online (in the online Animals Australia community), is enacted more commonly through personal and familial everyday actions such as shopping, cooking and eating than it is through such public actions as explicitly advocating or demonstrating for better welfare standards for animals involved in factory farming. A discourse analysis was conducted of 2198 posts from October 2013 to January 2014 to analyse contributors' accounts of their feelings (notably their gut reactions) and reasons for pledging, as well as to examine how contributors' accounts of their everyday practices might be understood as the development of a voice for these voiceless animals'. Overall, then, our analysis has shown supporters, participants and/or consumers who support the Make it Possible' campaign self-select into and identify themselves in terms of four overlapping frames: being vegan or vegetarian, shopping for change, personal activism and public activism and advocacy. This paper contributes to the debate concerning intersectional activism within the food activism movement.
Description:
A new species of Friesea was found in East Antarctica and is described here as Friesea eureka sp. nov. This is the first new collembolan species to be described from the Antarctic continent in 30 years, even though ice-free areas have been intensively surveyed over that time. It brings to five the number of described species of the genus Friesea known from the Antarctic continent and Peninsula, so is the most speciose genus of Collembola in the region. However, one of these, F. grisea Schäffer, comprises a number of cryptic species of different molecular lineages. The new species is distinguished by having 4 + 4 ocelli plus 1 + 1 hardly visible, a very reduced furca, up to four or five faintly clavate tenent hairs, four anal spines and four spinose chaetae in adult. The restricted distribution of the species emphasises the importance of protecting ice-free areas on the continent as they often contain at least one locally endemic faunal species.
Description:
The problem of cluster analysis is formulated as a problem of nonsmooth, nonconvex optimization. An algorithm for solving the latter optimization problem is developed which allows one to significantly reduce the computational efforts. This algorithm is based on the so-called discrete gradient method. Results of numerical experiments are presented which demonstrate the effectiveness of the proposed algorithm.
Description:
The problem of cluster analysis is formulated as a problem of nonsmooth, nonconvex optimization. An algorithm for solving the latter optimization problem is developed which allows one to significantly reduce the computational efforts. This algorithm is based on the so-called discrete gradient method. Results of numerical experiments are presented which demonstrate the effectiveness of the proposed algorithm.
Description:
Over recent years, there has been increasing recognition that the burden of injuries and violence includes more than just the direct and indirect monetary costs associated with their medical outcomes. However, quantification of the total burden has been seriously hampered by lack of a framework for considering the range of outcomes which comprise the burden, poor identification of the outcomes and their imprecise measurement. This article proposes a new conceptual framework, the List of All Deficits (or LOAD) Framework, that has been developed from extensive expert discussion and consensus meetings to facilitate the measurement of the full burden of injuries and violence. The LOAD Framework recognises the multidimensional nature of injury burden across individual, family and societal domains. This classification of potential consequences of injury was built on the International Classification of Functioning concept of disability. Examples of empirical support for each consequence were obtained from the scientific literature. Determining the multidimensional injury burden requires the assessment and combination of 20 domains of potential consequences. The resulting LOAD Framework classification and concept diagram describes 12 groups of injury consequences for individuals, three for family and close friends and five for wider society. Understanding the extent of the negative implications (or deficits) of injury, through application of the LOAD Framework, is needed to put existing burden of injury studies into context and to highlight the inter-relationship between the direct and indirect burden of injury relative to other conditions.
Description:
In this paper we develop an optimization approach for the study of adverse drug reaction (ADR) problems. This approach is based on drug-reaction relationships represented in the form of a vector of weights, which can be defined as a solution to some global optimization problem. Although it can be used for solving many ADR problems, we concentrate on two of them here: the accurate identification of drugs that are responsible for reactions that have occurred, and drug-drug interactions. Based on drug-reaction relationships, we formulate these problems as an optimization problem. The approach is applied to cardiovascularn-type reactions from the Australian Adverse Drug Reaction Advisory Committee (ADRAC) database. Software based on this approach has been developed and could have beneficial use in prescribing.
Description:
Bruce Beresford’s film Puberty Blues (1981) focuses on Australian surf culture of the 1970s and the Sydney beach-side suburb of Cronulla Beach, presenting the Cronulla surf subculture as a prism through which Australian society is viewed. The film, which centres on the quest of the characters of Debbie and Sue to join the elite Greenhills surfing gang, signifies a turning point in Australian screen depictions of class, prefiguring an increased emphasis on the middle class and deviating from a traditional equation of class with the working class. The film’s bleak and satirical portrayal of the Australian middle class also reveals dimensions of suburban Australia that are usually absent from local films and television series. Based on Kathy Lette and Gabrielle Carey’s 1979 novel of the same name, the film draws on a cultural tradition that associates surfing with freedom from social constraints. Yet the film depicts the protagonists’ idealization of surfers as being undermined when drugs intrude upon their world. The flight from middle-class suburban existence also suggests that the comforts of suburbia are deceptive. This article’s analysis of class and subculture in Puberty Blues aims to draw greater attention to Australian film depictions of subculture and middle-class life, for despite the large body of work around subcultures and although the majority of Australian films made in the last 25 years centre on the middle class, these aspects of Australian cinema have generally received little analysis from film and cultural studies scholars.
Description:
Bruce Beresford’s film Puberty Blues (1981) focuses on Australian surf culture of the 1970s and the Sydney beach-side suburb of Cronulla Beach, presenting the Cronulla surf subculture as a prism through which Australian society is viewed. The film, which centres on the quest of the characters of Debbie and Sue to join the elite Greenhills surfing gang, signifies a turning point in Australian screen depictions of class, prefiguring an increased emphasis on the middle class and deviating from a traditional equation of class with the working class. The film’s bleak and satirical portrayal of the Australian middle class also reveals dimensions of suburban Australia that are usually absent from local films and television series. Based on Kathy Lette and Gabrielle Carey’s 1979 novel of the same name, the film draws on a cultural tradition that associates surfing with freedom from social constraints. Yet the film depicts the protagonists’ idealization of surfers as being undermined when drugs intrude upon their world. The flight from middle-class suburban existence also suggests that the comforts of suburbia are deceptive. This article’s analysis of class and subculture in Puberty Blues aims to draw greater attention to Australian film depictions of subculture and middle-class life, for despite the large body of work around subcultures and although the majority of Australian films made in the last 25 years centre on the middle class, these aspects of Australian cinema have generally received little analysis from film and cultural studies scholars.
Description:
We present an algorithm to locally minimize nonsmooth, nonconvex functions. In order to find descent directions, the notion of quasisecants, introduced in this paper, is applied. We prove that the algorithm converges to Clarke stationary points. Numerical results are presented demonstrating the applicability of the proposed algorithm to a wide variety of nonsmooth, nonconvex optimization problems. We also compare the proposed algorithm with the bundle method using numerical results.
Description:
This study examined trends in sport participation among females over a six-year period (2011-2016) within five popular sports, by age and region. It also identified future challenges community sports face in increasing female sport participation. De-identified participant registration data for the five sports were obtained and analysed according to age, gender and region (metropolitan v non-metropolitan) within the state of Victoria, Australia. Data for all sports were aggregated and analysed collectively to produce a broad participation profile. Interviews were held with community sport stakeholders (n = 17) across a low socio-economic metropolitan and non-metropolitan region to understand challenges associated with increasing female sport participation. Results showed that female sport participation levels increased over the six-year period, with greater proportional increases among the youngest age group (4-9 years) - the common entry age into the organised sport through modified sports programs. Retention of females in sport throughout adolescence and adulthood remains a challenge. Community-level sports face challenges to accommodate growth in female sport participation in terms of availability and quality of sport infrastructure and volunteer capacity - both human resources to deliver sport and organisational capacity to devise and implement strategies to recruit and retain females. They also face challenges associated with the social construction of gender within sport and club environments. Sport policies that encourage female sport participation need to also consider the supply of sport such as maximising infrastructure usage, gender equity facility usage policies and developing volunteer capacity.
Description:
This study examined trends in sport participation among females over a six-year period (2011-2016) within five popular sports, by age and region. It also identified future challenges community sports face in increasing female sport participation. De-identified participant registration data for the five sports were obtained and analysed according to age, gender and region (metropolitan v non-metropolitan) within the state of Victoria, Australia. Data for all sports were aggregated and analysed collectively to produce a broad participation profile. Interviews were held with community sport stakeholders (n = 17) across a low socio-economic metropolitan and non-metropolitan region to understand challenges associated with increasing female sport participation. Results showed that female sport participation levels increased over the six-year period, with greater proportional increases among the youngest age group (4-9 years) - the common entry age into the organised sport through modified sports programs. Retention of females in sport throughout adolescence and adulthood remains a challenge. Community-level sports face challenges to accommodate growth in female sport participation in terms of availability and quality of sport infrastructure and volunteer capacity - both human resources to deliver sport and organisational capacity to devise and implement strategies to recruit and retain females. They also face challenges associated with the social construction of gender within sport and club environments. Sport policies that encourage female sport participation need to also consider the supply of sport such as maximising infrastructure usage, gender equity facility usage policies and developing volunteer capacity.
Description:
Birds can spread microorganisms through their movement; however, it is still not fully understood how wild birds acquire and disperse antimicrobial-resistant (AMR) bacteria. We sampled wild Australian birds from three geographically distinct locations for the presence of AMR strains of two clinically important species of bacteria, Escherichia coli and Enterococcus spp. A total of 121 birds were sampled, representing 15 different species. Thirty E. coli and 54 Enterococcus isolates were tested for resistance to 12 and 8 different antibiotics, respectively. Resistance to at least one antibiotic was common, being detected in 96% of Enterococcus and 60% of E. coli isolates. The vancomycin-resistance genes vanA and vanD were detected in 22% of enterococci (13% vanA, 9% vanD), while 9% displayed phenotypic resistance with no associated gene. Wild birds are a carrier of AMR bacteria in Australia, and are capable of harbouring a more diverse range of vancomycin-resistance genes than is typically seen among Australian clinical isolates.
Description:
Birds can spread microorganisms through their movement; however, it is still not fully understood how wild birds acquire and disperse antimicrobial-resistant (AMR) bacteria. We sampled wild Australian birds from three geographically distinct locations for the presence of AMR strains of two clinically important species of bacteria, Escherichia coli and Enterococcus spp. A total of 121 birds were sampled, representing 15 different species. Thirty E. coli and 54 Enterococcus isolates were tested for resistance to 12 and 8 different antibiotics, respectively. Resistance to at least one antibiotic was common, being detected in 96% of Enterococcus and 60% of E. coli isolates. The vancomycin-resistance genes vanA and vanD were detected in 22% of enterococci (13% vanA, 9% vanD), while 9% displayed phenotypic resistance with no associated gene. Wild birds are a carrier of AMR bacteria in Australia, and are capable of harbouring a more diverse range of vancomycin-resistance genes than is typically seen among Australian clinical isolates.
Description:
Objectives: Living alone is a risk factor for depressive symptoms among older men, and is likely to occur due to belongingness needs being unmet. It is proposed the living alone-sense of belonging and living alone-depressive symptoms relations are stronger for gay men than heterosexual men, due to different family circumstances. This research tested a moderated mediation model, specifically whether the relationship between living alone and depressive symptoms is mediated by sense of belonging, and whether the living alone-sense of belonging and living alone-depressive symptoms relationships are moderated by sexual orientation. Method: A community sample of 169 Australian gay men aged 65 to 93 years and 187 Australian heterosexual men aged 65 to 94 years completed the Psychological subscale of the Sense of Belonging Instrument and the Center for Epidemiologic Studies Depression Scale. Results: Results supported the simple mediation model, with living alone being associated directly and indirectly with depressive symptoms via sense of belonging. The conditional indirect effect of living alone on depressive symptoms via sense of belonging was not significant, and therefore the moderated mediation model was not supported. Conclusion: Results imply that older men who live alone are at increased risk of depressive symptoms directly and indirectly via lower levels of sense of belonging.
Description:
Objective: Scientific knowledge about symptoms of common mental disorders in elite sports is scarce. Consequently, the objectives of the study were to (i) establish the 12-month incidence of symptoms of common mental disorders (CMD; distress, anxiety/depression, sleep disturbance, adverse alcohol use, eating disorders) among Dutch elite athletes and (ii) explore their potential association with several stressors (being injured, recent life events, career dissatisfaction).Methods: A prospective cohort study with a 12-month follow-up period was conducted. The study used validated questionnaires to assess symptoms of common mental disorders (thus not clinically diagnosed) as well as several stressors; an electronic questionnaire was set up and repeatedly distributed.Results: A total of 203 elite athletes gave their written informed consent to participate in the study, from which 143 completed the 12-month follow-up period (follow-up rate of 70%). Incidence of symptoms of CMD ranged from 6% for adverse alcohol use to 57% for symptoms of anxiety/depression. Over the follow-up period, around 17% of the participants reported two simultaneous symptoms of CMD, and around 19% reported three simultaneous symptoms of CMD. Inferences between some stressors and symptoms of CMD were found but none of the associations were statistically significant.Conclusions: Substantial 12-month incidence rates of symptoms of CMD (self-reported and not clinically diagnosed) were found among Dutch elite athletes (especially for anxiety/depression), appearing similar to the ones found among athletes from other sports disciplines and the Dutch general population. Also, inferences between some stressors and symptoms of CMD were found but none of the associations were statistically significant. Supportive and preventive measures directed towards symptoms of CMD should be developed to improve awareness and psychological resilience of athletes, which would likely improve their performance and quality-of-life.
Description:
Objective: Scientific knowledge about symptoms of common mental disorders in elite sports is scarce. Consequently, the objectives of the study were to (i) establish the 12-month incidence of symptoms of common mental disorders (CMD; distress, anxiety/depression, sleep disturbance, adverse alcohol use, eating disorders) among Dutch elite athletes and (ii) explore their potential association with several stressors (being injured, recent life events, career dissatisfaction).Methods: A prospective cohort study with a 12-month follow-up period was conducted. The study used validated questionnaires to assess symptoms of common mental disorders (thus not clinically diagnosed) as well as several stressors; an electronic questionnaire was set up and repeatedly distributed.Results: A total of 203 elite athletes gave their written informed consent to participate in the study, from which 143 completed the 12-month follow-up period (follow-up rate of 70%). Incidence of symptoms of CMD ranged from 6% for adverse alcohol use to 57% for symptoms of anxiety/depression. Over the follow-up period, around 17% of the participants reported two simultaneous symptoms of CMD, and around 19% reported three simultaneous symptoms of CMD. Inferences between some stressors and symptoms of CMD were found but none of the associations were statistically significant.Conclusions: Substantial 12-month incidence rates of symptoms of CMD (self-reported and not clinically diagnosed) were found among Dutch elite athletes (especially for anxiety/depression), appearing similar to the ones found among athletes from other sports disciplines and the Dutch general population. Also, inferences between some stressors and symptoms of CMD were found but none of the associations were statistically significant. Supportive and preventive measures directed towards symptoms of CMD should be developed to improve awareness and psychological resilience of athletes, which would likely improve their performance and quality-of-life.