Replacement Policies in Semantic Database Caching

Efficient data management is vital any organization that access databases. Because computers’ hard drives are slow, the more data that is stored, the longer it takes to access useful information. To improve the speed of data retrieval, caching is technique that can be used to store frequently-used results in fast levels of computer memory. By storing query results in a cache, we can narrow the search of future database queries and improve the speed of similar queries. However, most systems are not able to reserve large chunks of memory for this cache storage. A cache replacement algorithm can limit and control the amount of memory the cache consumes by determining which cache entries to remove in order to make space for new entries. This research finds the most efficient replacement policy for our cache that provides an acceleration to database queries without requiring an exorbitant amount of memory

‘An Acceptable Level of Violence’ Community Response to Crime: Northern Ireland and South Africa

This paper, drawing on focus group interview material, will therefore examine ways in which the communities in Northern Ireland and South Africa have responded to crime both during the conflict and thereafter. If the raison d’être for ‘political’ crime has been removed once a negotiated settlement is reached and the legitimacy of the State reaffirmed by agreement, can communities then subscribe to the formal system of criminal justice? Given the relatively recent, albeit fragile, arrival of a ‘peace’ settlement to Northern Ireland the paper considers what lessons, if any, can be learned from the South African post-conflict experience and its efforts to deal with community responses to crime

Violence in a Changing Political Context: Northern Ireland and South Africa

Northern Ireland and South Africa are moving from conflict to post-conflict societies. Both countries have new political dispensations and seek to eschew the legacy of bitter and bloody violence. The history of the political struggles has, however, embedded a culture tolerant of violence characterised by descriptions such as ‘an acceptable level of violence’ or ‘an imperfect peace’. Somehow the threshold of violence is different/higher in these countries because of their transitional status. This chapter will therefore explore how the meaning of violence is inextricably linked to the political context in Northern Ireland and South Africa. Specifically it will examine the continuing role of violence meted out by paramilitary/vigilante groups to alleged wrongdoers within the communities in which they operate, the stranglehold these groups exert and how, if at all, this is changing. The role played by the police and the criminal justice systems will also be discussed within the new era of established political systems that have replaced ‘white rule’ and ‘direct rule’ in South Africa and Northern Ireland respectively

Fear of Reprisal – Researching Intra-Communal Violence in Northern Ireland and South Africa

Measuring the impact of violence is fraught with problems, not least because of the definitional problems around what constitutes violence and how this might be quantified. If one considers violence perpetrated by paramilitaries in Northern Ireland or vigilante groups in South Africa then the task becomes even more difficult. This chapter will examine methodological problems associated with gaining access to, and undertaking research in, the dangerous arena of paramilitary violence in Northern Ireland and vigilante violence in South Africa. It will consider the difficulties in obtaining reliable information on the levels of violence particularly from official police sources, and the way in which this type of crime is classified. Other statistical sources such as pressure group data will be examined and problems highlighted with the use of documentation gleaned from tendentious organisations. Data about the impact of violence from primary research are also fraught with problems. Victims, for example, can be reluctant interviewees for fear of paramilitary/vigilante reprisal. A ‘victim’ of paramilitary/vigilante ‘punishment’ may be an erstwhile perpetrator of violence. Should one treat internecine turf wars between paramilitaries in Northern Ireland in a similar way to violence meted out in pursuit of their political goals? These and other issues make the measurement of the impact of violence difficult methodological questions. This chapter will therefore highlight these problems and examine how we managed them within this study of intra-communal violence

Fear of Reprisal – Researching Intra-Communal Violence in Northern Ireland and South Africa

Measuring the impact of violence is fraught with problems, not least because of the definitional problems around what constitutes violence and how this might be quantified. If one considers violence perpetrated by paramilitaries in Northern Ireland or vigilante groups in South Africa then the task becomes even more difficult. This chapter will examine methodological problems associated with gaining access to, and undertaking research in, the dangerous arena of paramilitary violence in Northern Ireland and vigilante violence in South Africa. It will consider the difficulties in obtaining reliable information on the levels of violence particularly from official police sources, and the way in which this type of crime is classified. Other statistical sources such as pressure group data will be examined and problems highlighted with the use of documentation gleaned from tendentious organisations. Data about the impact of violence from primary research are also fraught with problems. Victims, for example, can be reluctant interviewees for fear of paramilitary/vigilante reprisal. A ‘victim’ of paramilitary/vigilante ‘punishment’ may be an erstwhile perpetrator of violence. Should one treat internecine turf wars between paramilitaries in Northern Ireland in a similar way to violence meted out in pursuit of their political goals? These and other issues make the measurement of the impact of violence difficult methodological questions. This chapter will therefore highlight these problems and examine how we managed them within this study of intra-communal violence

‘An Acceptable Level of Violence’ Community Response to Crime: Northern Ireland and South Africa

This paper, drawing on focus group interview material, will therefore examine ways in which the communities in Northern Ireland and South Africa have responded to crime both during the conflict and thereafter. If the raison d’être for ‘political’ crime has been removed once a negotiated settlement is reached and the legitimacy of the State reaffirmed by agreement, can communities then subscribe to the formal system of criminal justice? Given the relatively recent, albeit fragile, arrival of a ‘peace’ settlement to Northern Ireland the paper considers what lessons, if any, can be learned from the South African post-conflict experience and its efforts to deal with community responses to crime

Development of a Nanodrop Shape Analysis Tool for Installation in a Novel Nanodrop Spectrophotometer

The rapid identification of liquid composition is an important task integral to a wide range of industries including medical, pharmaceuticals, petrochemicals, and vinification. To aid in this identification spectroscopy can be utilised, however specialised instrumentation must be developed to deliver quantitative information. A spectrophotometer uses spectral data to identify chemical composition of droplets. However, to accurately perform this function, prior knowledge of the size and shape of the droplet is essential to understand chemical quantity. Whilst image data can be easily captured with a high definition camera, the image analysis to translate images into a relevant region of interest (ROI) and to extract usable data autonomously has proven challenging. Here we report the autonomous detection of nanodrops and extraction of their cartesian co-ordinates facilitating the mathematical approximations that can beget values such as volume, contact angle, rate of absorption of spectra, and the length of light paths within the medium

Use of apical suction to facilitate extra-anatomic bypass for recurrent coarctation: a case report

The use of apical suction devices has been well described for maintaining satisfactory haemodynamics during off-pump surgical coronary revascularization. Its expanded use has been described in a few other situations. We describe here a case of recurrent coarctation where an extra-anatomic ascending to descending thoracic aorta bypass graft was constructed using cardiopulmonary bypass without arresting the heart, and access and exposure were facilitated by the use of an apical suction device

Mitochondrial function declines with age within individuals but is not linked to the pattern of growth or mortality risk in zebra finch

Mitochondrial dysfunction is considered a highly conserved hallmark of ageing. However, most of the studies in both model and non-model organisms are cross-sectional in design; therefore, little is known, at the individual level, on how mitochondrial function changes with age, its link to early developmental conditions or its relationship with survival. Here we manipulated the postnatal growth in zebra finches (Taeniopygia guttata) via dietary modification that induced accelerated growth without changing adult body size. In the same individuals, we examined blood cells mitochondrial functioning (mainly erythrocytes) when they were young (ca. 36 weeks) and again in mid-aged (ca. 91 weeks) adulthood. Mitochondrial function was strongly influenced by age but not by postnatal growth conditions. Across all groups, within individual ROUTINE respiration, OXPHOS and OXPHOS coupling efficiency significantly declined with age, while LEAK respiration increased. However, we found no link between mitochondrial function and the probability of survival into relatively old age (ca. 4 years). Our results suggest that the association between accelerated growth and reduced longevity, evident in this as in other species, is not attributable to age-related changes in any of the measured mitochondrial function traits