Addressing Vertical Partitioning Issues in Federated Learning

Author(s):  
Dinesh C. Verma
2007 ◽  
Vol 13 (4) ◽  
pp. 922-922 ◽  
Author(s):  
ERIC A. DAVIDSON ◽  
KATHLEEN E. SAVAGE ◽  
SUSAN E. TRUMBORE ◽  
WERNER BORKEN

2013 ◽  
Vol 16 (10) ◽  
pp. 3041-3054 ◽  
Author(s):  
Loreto De Brabandere ◽  
Don E. Canfield ◽  
Tage Dalsgaard ◽  
Gernot E. Friederich ◽  
Niels Peter Revsbech ◽  
...  

Author(s):  
Ashish Ranjan Mishra ◽  
Neelendra Badal

This chapter explains an algorithm that can perform vertical partitioning of database tables dynamically on distributed database systems. After vertical partitioning, a new algorithm is developed to allocate that fragments to the proper sites. To accomplish this, three major tasks are performed in this chapter. The first task is to develop a partitioning algorithm, which can partition the relation in such a way that it would perform better than most of the existing algorithms. The second task is to allocate the fragments to the appropriate sites where allocating the fragments will incur low communication cost with respect to other sites. The third task is to monitor the change in frequency of queries at different sites as well as same site. If the change in frequency of queries at different sites as well as the same site exceeds the threshold, the re-partitioning and re-allocation are performed.


Author(s):  
Patrick Baskwell

Was Abraham Kuyper, scholar, statesman, and university founder, the ideological father of Apartheid in South Africa? Many belief so. But, there are others, amongst them George Harinck of the Free University in Amsterdam, who don’t think so. The article argues that there is an element of truth in both opinions. Kuyper did exhibit the casual racism so characteristic of the Victorian era, with its emphasis on empire building and all that it entailed. Kuyper was also directly responsible, ideologically, for the social structure in the Netherlands known as “verzuiling” or “pillarization” in terms of which members of the Catholic, Protestant, or Socialist segments of society had their own social institutions. This pillarizing, or segmenting, of society was, however, always voluntary. This is not true of the pillarizing or segmenting of South African society known as Apartheid. While there are similarities between Apartheid and “verzuiling”, especially in their vertical partitioning of the individual’s entire life, the South African historical context, the mediation of Kuyper’s ideas through South African scholars, the total government involvement, and therefore, the involuntary nature of Apartheid, point to their inherent dissimilarity. Apartheid was simply not pure Kuyper. Hence, while the effects of Kuyper’s ideas are clearly discernable in Apartheid policy, the article aims at arguing that Kuyper cannot be considered the father of Apartheid in any direct way.


2013 ◽  
Vol 303-306 ◽  
pp. 2139-2143
Author(s):  
Jie Jiang ◽  
Zhu Yan Gu ◽  
Tie Ming Chen

Vertical partitioning is a process of generating fragments, each of which is composed of attributes with high affinity. It is widely used in the distributed database to improve the efficiency of system by reducing the connection between the table access operations. The current research on vertical partitioning is mainly focused on how to measure the "affinity" to get the best-fit vertical partitioning and the n-way vertical partitioning which support generating the specific number of fragments required by the user. In this paper, we propose a vertical partitioning algorithm based on privacy constraint. It supports both the best-fit vertical partitioning and the n-way vertical partitioning. It also provides the data privacy protection by privacy constraint checking. We conduct several experimental results to show that our algorithm not only keeps higher efficiency, but also provides data privacy protection.


2013 ◽  
Vol 9 (4) ◽  
pp. 20130466 ◽  
Author(s):  
John Krigbaum ◽  
Michael H. Berger ◽  
David J. Daegling ◽  
W. Scott McGraw

This study tests the hypothesis that vertical habitat preferences of different monkey species inhabiting closed canopy rainforest are reflected in oxygen isotopes. We sampled bone from seven sympatric cercopithecid species in the Taï forest, Côte d'Ivoire, where long-term study has established taxon-specific patterns of habitat use and diet. Modern rib samples ( n = 34) were examined for oxygen ( δ 18 O ap ) and carbon ( δ 13 C ap ) from bone apatite (‘bioapatite’), and carbon ( δ 13 C co ) and nitrogen ( δ 15 N co ) from bone collagen. Results are consistent for C 3 feeders in a closed canopy habitat. Low irradiance and evapotranspiration, coupled with high relative humidity and recycled CO 2 in forest understory, contribute to observed isotopic variability. Both δ 13 C co and δ 13 C ap results reflect diet; however, δ 13 C values are not correlated with species preference for canopy height. By contrast, δ 18 O ap results are correlated with mean observed height and show significant vertical partitioning between taxa feeding at ground, lower and upper canopy levels. This oxygen isotope canopy effect has important palaeobiological implications for reconstructing vertical partitioning among sympatric primates and other species in tropical forests.


Sign in / Sign up

Export Citation Format

Share Document