scholarly journals Complex Causal Structures of Neighbourhood Change: Evidence From a Functionalist Model and Yelp Data

2021 ◽  
Author(s):  
Daniel Silver ◽  
Thiago H Silva

Why some neighbourhoods change over time but others retain their identity remains an open question. Several attempts have been made to answer this question, with a family of models emerging as a result. However, empirically evaluating neighbourhood evolution models is a challenging task, because most require information that is difficult to obtain in traditional sources. For this reason, researchers have turned to new datasets, such as census microdata, Twitter, and Yelp. In this study, we articulate a functional model of neighbourhood change and continuity, adapted from a classical functionalist model proposed by Stinchcombe in 1968. We argue this model provides a relatively simple way to capture key aspects of the complex causal structure of neighbourhood change that are implicit in much neighbourhood change research but rarely formulated explicitly. We demonstrate how to assess the proposed model empirically using large-scale data from Yelp.com. Our results indicate that our approach can potentially help to understand the nature of neighbourhood change and be useful in different applications.

CONVERTER ◽  
2021 ◽  
pp. 116-127
Author(s):  
Ajay Bansal, Manmohan Sharma, Ashu Gupta

One of the most challenging aspects of using MapReduce to parallelize and distribute large-scale data processingis detecting straggler tasks. Identifying ongoing tasks on weak nodes is how it’s described. The total computation time isthe sum of the execution times of the two stages in the Map process (copy, combine) and the three stages in the Reducephase (shuffle, sort, and reduce). The main aim of this paper is to estimate the accurate execution time in each location. Theproposed approach uses a backpropagation neural network on Hadoop to detect straggler tasks and calculate the remainingtask execution time, which is crucial in straggler task identification. The comparative analysis is done with some efficientmodels in this domain, such as LATE, ESAMR, and the real remaining time for WordCount and Sort benchmarks. It wasfound that the proposed model is capable of detecting straggler tasks in accurately estimating execution time. It also helpsin reducing the execution time that it takes to complete a task.


2018 ◽  
Vol 5 (2) ◽  
pp. 1-20
Author(s):  
Sudhansu Shekhar Patra ◽  
Veena Goswami

Due to the advancements in virtualization technology, it is now an up and coming field and has become a more appealing area of internet technology. Since there is a rapid growth for the demand of computational power increases by scientific, business, and web-applications, it leads to the creation of large-scale data centers. These data centers consume enormous amounts of electrical power. In this article, the authors study energy saving methods by consolidation and by switching off those virtual machines which are not in use. According to this policy, c virtual machines continue serving the customer until the number of idle server attains the threshold level d; then d idle servers take synchronous vacation simultaneously, otherwise these servers would begin serving the customers. Numerical results are provided to demonstrate the applicability of the proposed model for data center management in particular, to quantify the tradeoff theoretically between the conflicting aims of energy efficiency and QoS.


2009 ◽  
Vol 28 (11) ◽  
pp. 2737-2740
Author(s):  
Xiao ZHANG ◽  
Shan WANG ◽  
Na LIAN

2016 ◽  
Author(s):  
John W. Williams ◽  
◽  
Simon Goring ◽  
Eric Grimm ◽  
Jason McLachlan

2008 ◽  
Vol 9 (10) ◽  
pp. 1373-1381 ◽  
Author(s):  
Ding-yin Xia ◽  
Fei Wu ◽  
Xu-qing Zhang ◽  
Yue-ting Zhuang

2021 ◽  
Vol 77 (2) ◽  
pp. 98-108
Author(s):  
R. M. Churchill ◽  
C. S. Chang ◽  
J. Choi ◽  
J. Wong ◽  
S. Klasky ◽  
...  

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