title: Domain-specific keyphrase extraction

authors: Frank, Eibe

subjects: computer science

abstract: Keyphrases are an important means of document summarization, clustering, and topic search. Only a small minority of documents have author-assigned keyphrases, and manually assigning keyphrases to existing documents is very laborious. Therefore it is highly desirable to automate the keyphrase extraction process.
This paper shows that a simple procedure for keyphrase extraction based on the naive Bayes learning scheme performs comparably to the state of the art. It goes on to explain how this procedure's performance can be boosted by automatically tailoring the extraction process to the particular document collection at hand. Results on a large collection of technical reports in computer science show that the quality of the extracted keyphrases improves significantly when domain-specific information is exploited.

text: Domain-specific keyphrase extraction Keyphrases are an important means of document summarization, clustering, and topic search. Only a small minority of documents have author-assigned keyphrases, and manually assigning keyphrases to existing documents is very laborious. Therefore it is highly desirable to automate the keyphrase extraction process.
This paper shows that a simple procedure for keyphrase extraction based on the naive Bayes learning scheme performs comparably to the state of the art. It goes on to explain how this procedure's performance can be boosted by automatically tailoring the extraction process to the particular document collection at hand. Results on a large collection of technical reports in computer science show that the quality of the extracted keyphrases improves significantly when domain-specific information is exploited.

year: 1999

title: Reproductive competition in the context of a superorganism

authors: Carta, Epernay

abstract: Population density is a fundamental ecological factor that shapes the intensity of competition within a species. Increased density often intensifies competition for resources and mates, driving the evolution of diverse adaptive responses in behaviour, morphology and physiology. A key area where density-mediated competition manifests is in sperm competition. This occurs when sperm from multiple males compete to fertilise the ova of a female. Species facing intense competition exhibit a range of adaptations, including adjustments in sperm production, ejaculate characteristics, and mating strategies. Elevated population density is a major factor that can exacerbate sperm competition, further amplifying these evolutionary pressures. Within this context, this thesis investigates the effects of apiary density on reproductive strategies and drone physiology in the honey bee (Apis mellifera), a highly social insect that exhibits a complex interplay between individual and colony- level responses. Apiary density, characterised by the number of colonies within a defined area, was manipulated across three treatments: low (8 colonies), medium (60-68 colonies), and high (120 colonies). Drone brood production and comb allocation (both drone and worker) were measured monthly to assess colony-level investment in reproduction versus worker production. Total sperm count and the proportion of viable sperm were assessed in drones collected from each density treatment to evaluate sperm competition dynamics. Heat Shock Protein 70 (HSP70) levels, a biomarker of cellular stress, were quantified in drones from each treatment using an enzyme-linked immunosorbent assay. Colonies in high-density apiaries exhibited significantly increased drone brood production and higher total sperm counts compared to those in low-density apiaries. However, worker comb production was significantly reduced in high-density apiaries, suggesting a trade-off between resource allocation towards reproduction and colony maintenance. Sperm viability varied across densities and seasons, with low-density treatments having a higher proportion of viable sperm in early summer and medium-density treatments showing higher viability in late summer. This suggests that while high-density may favour increased sperm quantity, lower densities might facilitate greater investment in sperm quality. Apiary density significantly predicted HSP70 concentration in drones, with drones from high-density apiaries displaying significantly elevated levels, indicating increased physiological stress. These findings suggest that colonies in high-density environments experience intensified sperm competition, responding by increasing drone and sperm production. However, the observed variation in sperm viability and reduced worker comb production implies that this augmented reproductive investment may compromise overall colony function. The elevated HSP70 levels further corroborate that drones in high-density apiaries are subjected to greater physiological stress. Crucially, this study provides a unique perspective by demonstrating that apiary density, a factor often controlled in beekeeping, acts as a significant driver of reproductive strategies and physiological stress at both the colony and individual drone level within a superorganism. This highlights the profound impact of a managed environmental parameter on the evolutionary dynamics of a highly social species, offering critical insights for sustainable apicultural practices.

text: Reproductive competition in the context of a superorganism Population density is a fundamental ecological factor that shapes the intensity of competition within a species. Increased density often intensifies competition for resources and mates, driving the evolution of diverse adaptive responses in behaviour, morphology and physiology. A key area where density-mediated competition manifests is in sperm competition. This occurs when sperm from multiple males compete to fertilise the ova of a female. Species facing intense competition exhibit a range of adaptations, including adjustments in sperm production, ejaculate characteristics, and mating strategies. Elevated population density is a major factor that can exacerbate sperm competition, further amplifying these evolutionary pressures. Within this context, this thesis investigates the effects of apiary density on reproductive strategies and drone physiology in the honey bee (Apis mellifera), a highly social insect that exhibits a complex interplay between individual and colony- level responses. Apiary density, characterised by the number of colonies within a defined area, was manipulated across three treatments: low (8 colonies), medium (60-68 colonies), and high (120 colonies). Drone brood production and comb allocation (both drone and worker) were measured monthly to assess colony-level investment in reproduction versus worker production. Total sperm count and the proportion of viable sperm were assessed in drones collected from each density treatment to evaluate sperm competition dynamics. Heat Shock Protein 70 (HSP70) levels, a biomarker of cellular stress, were quantified in drones from each treatment using an enzyme-linked immunosorbent assay. Colonies in high-density apiaries exhibited significantly increased drone brood production and higher total sperm counts compared to those in low-density apiaries. However, worker comb production was significantly reduced in high-density apiaries, suggesting a trade-off between resource allocation towards reproduction and colony maintenance. Sperm viability varied across densities and seasons, with low-density treatments having a higher proportion of viable sperm in early summer and medium-density treatments showing higher viability in late summer. This suggests that while high-density may favour increased sperm quantity, lower densities might facilitate greater investment in sperm quality. Apiary density significantly predicted HSP70 concentration in drones, with drones from high-density apiaries displaying significantly elevated levels, indicating increased physiological stress. These findings suggest that colonies in high-density environments experience intensified sperm competition, responding by increasing drone and sperm production. However, the observed variation in sperm viability and reduced worker comb production implies that this augmented reproductive investment may compromise overall colony function. The elevated HSP70 levels further corroborate that drones in high-density apiaries are subjected to greater physiological stress. Crucially, this study provides a unique perspective by demonstrating that apiary density, a factor often controlled in beekeeping, acts as a significant driver of reproductive strategies and physiological stress at both the colony and individual drone level within a superorganism. This highlights the profound impact of a managed environmental parameter on the evolutionary dynamics of a highly social species, offering critical insights for sustainable apicultural practices.

year: 2025

title: Māori child rearing and infant sleep practices

authors: Jones, Horiana Majorie

abstract: Sleep is important to a healthy lifestyle for parents and children, and having effective ways of putting a child to sleep contributes significantly to mental and physical wellbeing. Cultural groups around the world have developed a variety of approaches to this task, for example, rocking, co-sleeping, bed-sharing, breastfeeding to sleep, and encouraging infants to self soothe through various methods of infant sleep training. In New Zealand the continuation of traditional Māori approaches to infant sleep, e.g. co-sleeping, bed-sharing, responsivity to infant cues have been over-shadowed by its negative association with sudden infant death syndrome (SIDS) and dependence on parent interaction when initiating infant sleep. In this study, we were interested in the approaches Māori parents used to put their pēpi (child, 2 months-2 years of age) to sleep and the various factors that have influenced these approaches. Data were collected through online surveys (n =58) and face-to-face interviews (n =10) with Māori parents. Survey results indicated that being held and breast or bottle fed to sleep were the most practiced techniques by Māori parents. Parent assisted approaches, e.g., rocking, feeding, lying with baby until they go to sleep, were the most practiced. Many parents planned for their babies to sleep separately but very few actually persisted with self-soothing approaches due to a number of factors, such as discomfort with listening to their babies cry, culture, whānau (extended families) influences safety, and convenience. The majority of participants expressed a desire for separate sleep; however, few within the interview group actually successfully practiced separate sleep regularly.

text: Māori child rearing and infant sleep practices Sleep is important to a healthy lifestyle for parents and children, and having effective ways of putting a child to sleep contributes significantly to mental and physical wellbeing. Cultural groups around the world have developed a variety of approaches to this task, for example, rocking, co-sleeping, bed-sharing, breastfeeding to sleep, and encouraging infants to self soothe through various methods of infant sleep training. In New Zealand the continuation of traditional Māori approaches to infant sleep, e.g. co-sleeping, bed-sharing, responsivity to infant cues have been over-shadowed by its negative association with sudden infant death syndrome (SIDS) and dependence on parent interaction when initiating infant sleep. In this study, we were interested in the approaches Māori parents used to put their pēpi (child, 2 months-2 years of age) to sleep and the various factors that have influenced these approaches. Data were collected through online surveys (n =58) and face-to-face interviews (n =10) with Māori parents. Survey results indicated that being held and breast or bottle fed to sleep were the most practiced techniques by Māori parents. Parent assisted approaches, e.g., rocking, feeding, lying with baby until they go to sleep, were the most practiced. Many parents planned for their babies to sleep separately but very few actually persisted with self-soothing approaches due to a number of factors, such as discomfort with listening to their babies cry, culture, whānau (extended families) influences safety, and convenience. The majority of participants expressed a desire for separate sleep; however, few within the interview group actually successfully practiced separate sleep regularly.

year: 2017