997 resultados para Medieval sources
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Rothwell, W., 'Synonymity and Semantic Variability in Medieval French and Middle English', Modern Language Review (2007) 102(2) pp.363-380 RAE2008
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Wydział Historyczny: Instytut Prahistorii
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Wydział Historyczny: Instytut Historii Sztuki
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http://www.archive.org/details/atseandinportorl00hineiala
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Temporal locality of reference in Web request streams emerges from two distinct phenomena: the popularity of Web objects and the {\em temporal correlation} of requests. Capturing these two elements of temporal locality is important because it enables cache replacement policies to adjust how they capitalize on temporal locality based on the relative prevalence of these phenomena. In this paper, we show that temporal locality metrics proposed in the literature are unable to delineate between these two sources of temporal locality. In particular, we show that the commonly-used distribution of reference interarrival times is predominantly determined by the power law governing the popularity of documents in a request stream. To capture (and more importantly quantify) both sources of temporal locality in a request stream, we propose a new and robust metric that enables accurate delineation between locality due to popularity and that due to temporal correlation. Using this metric, we characterize the locality of reference in a number of representative proxy cache traces. Our findings show that there are measurable differences between the degrees (and sources) of temporal locality across these traces, and that these differences are effectively captured using our proposed metric. We illustrate the significance of our findings by summarizing the performance of a novel Web cache replacement policy---called GreedyDual*---which exploits both long-term popularity and short-term temporal correlation in an adaptive fashion. Our trace-driven simulation experiments (which are detailed in an accompanying Technical Report) show the superior performance of GreedyDual* when compared to other Web cache replacement policies.
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The relative importance of long-term popularity and short-term temporal correlation of references for Web cache replacement policies has not been studied thoroughly. This is partially due to the lack of accurate characterization of temporal locality that enables the identification of the relative strengths of these two sources of temporal locality in a reference stream. In [21], we have proposed such a metric and have shown that Web reference streams differ significantly in the prevalence of these two sources of temporal locality. These finding underscore the importance of a Web caching strategy that can adapt in a dynamic fashion to the prevalence of these two sources of temporal locality. In this paper, we propose a novel cache replacement algorithm, GreedyDual*, which is a generalization of GreedyDual-Size. GreedyDual* uses the metrics proposed in [21] to adjust the relative worth of long-term popularity versus short-term temporal correlation of references. Our trace-driven simulation experiments show the superior performance of GreedyDual* when compared to other Web cache replacement policies proposed in the literature.
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Higher Education Authority (PRTLI as part of National Development Plan)
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Much work has been done on learning from failure in search to boost solving of combinatorial problems, such as clause-learning and clause-weighting in boolean satisfiability (SAT), nogood and explanation-based learning, and constraint weighting in constraint satisfaction problems (CSPs). Many of the top solvers in SAT use clause learning to good effect. A similar approach (nogood learning) has not had as large an impact in CSPs. Constraint weighting is a less fine-grained approach where the information learnt gives an approximation as to which variables may be the sources of greatest contention. In this work we present two methods for learning from search using restarts, in order to identify these critical variables prior to solving. Both methods are based on the conflict-directed heuristic (weighted-degree heuristic) introduced by Boussemart et al. and are aimed at producing a better-informed version of the heuristic by gathering information through restarting and probing of the search space prior to solving, while minimizing the overhead of these restarts. We further examine the impact of different sampling strategies and different measurements of contention, and assess different restarting strategies for the heuristic. Finally, two applications for constraint weighting are considered in detail: dynamic constraint satisfaction problems and unary resource scheduling problems.
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This thesis examines the earliest extant Latin Lives of Brigit and Patrick; Cogitosus’s Vita Brigidae and Muirchú’s Vita Patricii as evidence for a seventh-century debate on Irish apostolicity. While often dismissed as mere propaganda, this thesis shows they are highly sophisticated demonstrations of the continuing connection that Kildare and Armagh had to their patron saints and their authority. It examines the importance of this connection for concepts of ecclesiastical organisation, teaching authority and episcopal succession against the backdrop of the seventh-century Easter question in the Insular Church. This will show that apostolicity was considered to be intrinsically linked with orthodoxy and universality. A textual focus brings forth general patristic themes and ideas that Irish hagiographers evoked through specific words and phrases. The thesis contextualises hagiographical material using evidence from Hiberno-Latin and early Insular exegetical commentaries, referring to major patristic exegetes such as Origen, Jerome, Augustine, and Gregory the Great as support. The introduction discusses the importance of apostolic ideology for the seventh-century Irish Church, and outlines a methodology for examining such abstract themes. The first chapter looks at how developments in apostolic ideology led to ideas of apostolic primacy seen in the Insular material. Chapters two, three, and four examine metaphors of food and feeding, the fountain and the stream, and the head and the body, as significant articulations of apostolicity. Chapter five examines how corporeal relics were understood as the visible proof of this continuity and preserved a saint’s authority for their episcopal heirs. Chapter six looks at how Muirchú engaged with Patrick’s connection to the universal Church and his self-professed lack of disciplina to reconcile his apostolicity with seventh-century norms. Chapter seven places the issues considered thus far in a thoroughly Insular context by examining how the earliest English sources present the Irish legacy in Northumbria after the synod of Whitby. Chapter eight looks at how the text of Patrick’s Confessio in the Book of Armagh relates to a wider seventh-century campaign by Armagh to rehabilitate Patrick’s apostolicity. The conclusion briefly summarizes the thesis, and suggests further avenues for researching this topic in the Insular material
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This thesis creates a multi-faceted archaeological context for early Irish monasticism, so as to ‘rematerialise’ a phenomenon that has been neglected by recent archaeological scholarship. Following revision of earlier models of the early Irish Church, archaeologists are now faced with redefining monasticism and distinguishing it from other diverse forms of Christian lifestyle. This research addresses this challenge, exploring the ways in which material limits can be set on the monastic phenomenon. The evidence for early Irish monasticism does not always conform to modern expectations of its character, and monastic space must be examined as culturally unique in its own right - though this thesis demonstrates that early Irish monasticism was by no means as unorthodox in its contemporary European setting as has previously been suggested. The research is informed by theories of the body, habitus and space, drawing on a wide body of archaeological, religious, sociological and anthropological thought. The data-set comprises evidences gathered through field-survey, reassessment of archaeological scholarship, historical research and cartographic research, enabling consideration of the ways in which early Irish monastics engaged with their environments. A sample of thirty-one early Irish ecclesiastical sites plus Iona forms the basis for discussion of the location and layout of monastic space, the ways in which monastics used buildings and space in their daily lives, the relationship of monasticism and material culture, the setting of mental and physical limits on monastic space and monastic bodies, and the variety of monastic lifestyles that pertained in early medieval Ireland. The study then examines the Christian landscapes of two case-studies in mid-Western Ireland in order to illustrate how monasticism functioned on the ground in these areas. As this research shows, the material complexities of early Irish monastic life are capable of archaeological definition in terms of both communal and personal lived experience.
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Practical realisation of quantum information science is a challenge being addressed by researchers employing various technologies. One of them is based on quantum dots (QD), usually referred to as artificial atoms. Being capable to emit single and polarization entangled photons, they are attractive as sources of quantum bits (qubits) which can be relatively easily integrated into photonic circuits using conventional semiconductor technologies. However, the dominant self-assembled QD systems suffer from asymmetry related problems which modify the energetic structure. The main issue is the degeneracy lifting (the fine-structure splitting, FSS) of an optically allowed neutral exciton state which participates in a polarization-entanglement realisation scheme. The FSS complicates polarization-entanglement detection unless a particular FSS manipulation technique is utilized to reduce it to vanishing values, or a careful selection of intrinsically good candidates from the vast number of QDs is carried out, preventing the possibility of constructing vast arrays of emitters on the same sample. In this work, site-controlled InGaAs QDs grown on (111)B oriented GaAs substrates prepatterned with 7.5 μm pitch tetrahedrons were studied in order to overcome QD asymmetry related problems. By exploiting an intrinsically high rotational symmetry, pyramidal QDs were shown as polarization-entangled photon sources emitting photons with the fidelity of the expected maximally entangled state as high as 0.721. It is the first site-controlled QD system of entangled photon emitters. Moreover, the density of such emitters was found to be as high as 15% in some areas: the density much higher than in any other QD system. The associated physical phenomena (e.g., carrier dynamic, QD energetic structure) were studied, as well, by different techniques: photon correlation spectroscopy, polarization-resolved microphotoluminescence and magneto-photoluminescence.
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Three indicators of health and diet were selected to examine the health status in three socioeconomic groups in post-medieval Ireland. The aim was to examine the reliability of traditional skeletal markers of health in highly contextualised populations. The link between socio-economic status and health was examined to determine if traditional linking of poor health with poverty was evident in skeletal samples. The analysis indicated that this was indeed the case and that health was significantly compromised in populations of low socio-economic status. Thus it indicated that status intimately influences the physical body form. Sex was also found to be a major defining factor in the response of an individual to physiological stress. It was also evident that contemporary populations may suffer from different physiological stresses, and their responses to those stresses may differ. Adaptation was a key factor here. This has implications for studies of earlier populations that may lack detailed contextual data in terms of blanket applications of interpretations. The results also show a decline in health from the medieval through to the post-medieval period, which is intimately linked with the immense social changes and all the related effects of these. The socio-economic structure of post-medieval Ireland was a direct result of the British policies in Ireland. The physical form of the Irish may be seen to have occurred as a result of those policies, with the Irish poor in particular suffering substantial health problems, even in contrast to the poor of Britain. This study has enriched the recorded historical narrative of this period of the recent past, and highlights more nuanced narratives may emerge from the osteoarchaeological analysis when sound contextual information is available. It also examines a period in Irish history that, until very recently, had been virtually untouched in terms of archaeological study.
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This thesis explores the impact of Christianity on the landscape in Ireland from the conversion period to the coming of the Anglo-Normans. The premise is that ecclesiastical and secular settlement formed a cohesive whole which characterised the societal organisation of early medieval Ireland. The matter of the thesis is to isolate some of the agents of cohesion to see was this homogenous or did it vary in different areas. One of these agents was the ownership of land and the thesis undertakes to identify ecclesiastical landholding and examine the manner of settlement on it. A corollary is to explore the contribution of the genealogical link between kin-group, founding saint and territory to the construction of local identities. This necessitated a narrow focus; thus small study areas were chosen, which approximated to early medieval kingdoms in North Louth, Rathdown, Co Dublin and Ross, Co Cork. A multidisciplinary approach was taken using both archaeological and documentary evidence. The thesis found ecclesiastical sites were at the same density through the study areas, but there were considerable regional variations in related secular settlement. Ecclesiastical estates were identified in the three study areas and common settlement patterns were found in two of them. Settlement in all areas indicated the foundation of minor churches by local groups. Ecclesiastical sites were found to be integral to kin-group identity and status, but the manner in which each group negotiated this, was very different. Finally the thesis examined material evidence for a change from diffused to concentrated power in the political organisation of Irish society, a process entwined with developments of the Viking Age. This centralisation of power and associated re-formation of identity was still often mediated through the ecclesiastical sphere but the thesis demonstrates diversity in the materialising of the mediation.
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This thesis explores the evolution of kingship in early medieval Ireland (AD 400–1150) through a kingdom based and multi-scalar approach to royal landscapes. Through exploring the role of place and landscape in the construction of early medieval Irish kingship, this study will assess the relationship between the social, economic and ideological roles of the king in Irish society. Kingship in Ireland was vested in places, such that royal landscapes were the pre-eminent symbol of regality and authority. As such, an interdisciplinary study of kingship grounded in archaeological methodologies has a unique potential to contribute to our knowledge of the practice of kingship. Consequently, this research considers the material apparatus of different scales of kingships and explores the role of landscape in the construction of kingship and the evolution of kingdoms. It takes two major case studies; (i) Cashel, Munster and the Éoganachta federation; and (ii) the Uí Néill, Tara and the Síl nÁedo Sláine kingdom of Brega. Through interdisciplinary methodologies it charts the genesis and development of political federations, focusing specifically on the role that royal landscapes’ played in their evolution. Similarly, this thesis engages critically with the nature of assembly places and practices in Ireland, and focuses specifically on issues pertaining to the nature of assembly and the archaeological manifestation of such practices. It includes a list of 115 landscapes identified as assembly places, and through the analysis of this material, this thesis examines the ways in which different types of royal sites articulated together to create royal landscapes implicated in the exercise of kingship, and the construction and maintenance of authority. Moreover, through the analysis of assembly places within the context of the development of kingdoms, and structures of jurisdiction and administration, it also investigates the evolution of supra-regional scales of identity and community associated with the emergence of major political federations in early medieval Ireland.
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The study of medieval carpentry is probably one of the most neglected aspects of archaeological research in Ireland. The principal difficulty is the nature of the evidence, in that timber, unless the conditions are right, rarely leaves a trace above ground. The problem is further exacerbated by the fact that not a single medieval timber-framed building has survived in Ireland. Nevertheless, in recent years, in addition to the medieval roof of Dunsoghley, which up to quite recently was thought to be the only surviving roof structure in Ireland, a further eight medieval roof structures have been identified. Furthermore, an extensive corpus of early medieval mills, with evidence for advanced Roman carpentry techniques, has been excavated, while evidence for Viking houses, on what is probably the largest extant Viking settlement in Europe, have also been recovered. Although post and wattle structures dominate the archaeological record of the Viking period, nevertheless, it will be shown that the Roman tradition of carpentry, evidenced in the early medieval mills from the early seventh century, continued in use in the wider Gaelic community. And it is one of the pivotal points of this study, that with the takeover of Dublin by the Gaelic Irish in the late tenth century, this Roman carpentry tradition was gradually assimilated into the carpentry tradition of the Viking towns, which were now largely inhabited by a mixed population of Hiberno-Norse. Evidence for this Gaelic influence can be seen not only in the gradual replacement of the Viking post and wattle house by timber houses with load-bearing walls, but more importantly by the evidence for waterfront structures founded on baseplates with mortise and tenoned uprights on the pre-Norman waterfront in Cork. Furthermore, it will be shown, that the carpentry techniques used to build the Wood Quay revetments, shortly after the Anglo-Norman conquest in AD 1170, supports this contention.