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A. A. Akhrem V. Z. Rakhmankulov K. V. Yuzhanin 《Scientific and Technical Information Processing》2017,44(6):406-411
In this paper, decomposition methods for multidimensional data hypercubes of OLAP systems are investigated. Criteria for reducing the computational complexity of the decomposition methods are presented and comparisons are made with the traditional solutions of multidimensional data analysis problems. Examples illustrating the application of these criteria to investigating the dynamics of computational complexity changes for specific types of reduction problems are considered. 相似文献
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For a channel-shoal system in a funnel-shaped basin the impact of dredging and dumping is investigated using a complex process-based
model. First, the residual flow and sediment transport circulations are analysed for the channel-shoal pattern, which has
emerged after a long-term model simulation. Results are compared to the Western Scheldt estuary, which forms the inspiration
for this study. Subsequently, different dredge and dump scenarios are modelled, according to a conceptual model, in which
ebb-and flood-channels and enclosed shoals form morphodynamic units (cells) with their own sediment circulation. Model results
show that dumping sediment in a channel further reduces the channel depth and induces erosion in the opposite channel, which
enhances tilting of the cross-section of the cell and eventually can lead to the degeneration of a multiple channel system
into a single channel. The impact of different dredging and dumping cases agrees with results from a stability analysis. This
means that this type of model applied to a realistic geometry can potentially be used for better prediction of the impact
of human interventions. 相似文献
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Geoffery Z. Kohe 《Sport in Society》2015,18(7):800-815
During the interwar period (1919–1939), protagonists of the early New Zealand Olympic Committee (NZOC) worked to renegotiate and improve the country's international sporting participation and involvement in the International Olympic Committee. To this end, NZOC effectively used its locally based administrators and well-placed expatriates in Britain to variously assert the organization's nascent autonomy, independence and political power, progress Antipodean athlete's causes and counter any potential doubt about the nation's peripheral position in imperial sporting dialogues. Adding to the corpus of scholarship on New Zealand's ties and tribulations with imperial Britain, both in and beyond sport (e.g. Beilharz and Cox, 2007, “Settler Capitalism Revisited,” Thesis Eleven 88: 112–124; Belich, 2001, Paradise Reforged: A History of the New Zealanders from the 1880s to the Year 2000, Auckland: Allen Lane; Belich, 2007, Making Peoples: A History of the New Zealanders from Polynesian Settlement to the End of the Nineteenth Century, Auckland: The Penguin Group; Coombes, 2006, Rethinking Settler Colonialism: History and Memory in Australia, Canada, Aotearoa New Zealand and South Africa, Manchester: Manchester University Press; MacLean, 2010, “New Zealand (Aotearoa),” In Routledge Companion to Sports History, edited by Steve W. Pope and John Nauright, 510–525, London: Routledge; Phillips, 1984, “Rugby, War and the Mythology of the New Zealand Male,” The New Zealand Journal of History 18 (1): 83–103; Phillips, 1987, A Man's Country: The Image of the Pakeha Male, Auckland: Penguin Books; Ryan, 2004, The Making of New Zealand Cricket, 1832–1914, London: Frank Cass; Ryan, 2005, Tackling Rugby Myths: Rugby and New Zealand Society 1854–2004, Dunedin: University of Otago Press; Ryan, 2007, “Sport in 19th-Century Aotearoa/New Zealand: Opportunities and Constraints,” In Sport in Aotearoa/New Zealand Society, edited by Chris Collins and Steve Jackson, 96–111, Auckland: Thomson), I will examine how the political actions and strategic location of three key NZOC agents (specifically, administrator Harry Amos and expatriates Arthur Porritt and Jack Lovelock) worked in their own particular ways to assert the position of the organization within the global Olympic fraternity. I argue that the efforts of Amos, Porritt and Lovelock also concomitantly served to remind Commonwealth sporting colleagues (namely Britain and Australia) that New Zealand could not be characterized as, or relegated to being, a distal, subdued or subservient colonial sporting partner. Subsequently, I contend that NZOC's development during the interwar period, and particularly the utility of expatriate agents, can be contextualized against historiographical shifts that encourage us to rethink, reimagine and rework narratives of empire, colonization, national identity, commonwealth and belonging. 相似文献
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2011年,作为全球最大能源使用国以及二氧化碳排放国,中美的建筑业所消耗的能源分别占到全国能源总消耗量的25%和40%。在建筑节能领域,绿色建筑的出现为消除建筑业所带来的对能源以及环境的负面影响提供了解决方法。为了促进绿色建筑的市场转型,推进设计和施工的差异化,中美均制定了国家绿色建筑分等评级程序以及配套政策。1998年,美国绿色建筑协会首次推出能源与环境先导设计(LEED),而中国政府则于2008年建立了中国绿色建筑评价标识(GBEL)。本文对美国LEED与中国GBEL评级程序、流程、评分系统以及扶持政策作了对比分析,研究发现,虽然两国所采用的绿色建筑设计以及操作评级程序的评分等级较为相似,它们在项目管理、评分要求和分配以及扶持政策类型等方面存在差异。美国能源与环境先导设计是由建筑产业利益相关者委员会制定并实施管理的。判断是否达到认证水平的灵活性更高。中国绿色建筑评价标识则是由政府操控的。判断是否达到评级水平的要求更为严格。但是,中国政府将在2014年下半年对中国绿色建筑评价标识的评级程序作出修正。本文对评级程序以及扶植政策的相似点以及差异是如何影响绿色建筑技术以及市场的发展作了分析,还讨论了绿色建筑未来发展可能面临的挑战以及政策导向意义。 相似文献