Combining Top-Down and Bottom-Up: Scalable Sub-tree Anonymization over Big Data Using MapReduce on Cloud

Author(s):  
Xuyun Zhang ◽  
Chang Liu ◽  
Surya Nepal ◽  
Chi Yang ◽  
Wanchun Dou ◽  
...  
Keyword(s):  
Big Data ◽  
Top Down ◽  
Intersections ◽  
2019 ◽  
Vol 5 (2) ◽  
Author(s):  
Bálint Magyar ◽  
Bálint Madlovics

Offering a decent database easily applicable to cross-country comparison, Transparency International’s Corruption Perceptions Index (CPI) has been widely used as a variable for showing the level of corruption. However, surveys of its sources are based on presumptions which mainly apply to bottom-up forms of corruption, namely free market corruption and bottom-up state capture, and therefore it is insufficient for assessing the state of a country plagued by top-down types of the former. We provide an analytical framework that distinguishes four levels of corruption and draws on the experience of the post-communist region. Using this framework to analyze the CPI’s survey questions, we explain why the index provides a blurred picture of the region. ‘Big data’ evidence for top-down corruption in Hungary is also presented, signifying the need for a more refined index.


2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Sepehr Ghazinoory ◽  
Shohreh Nasri ◽  
Roya Dastranj ◽  
Alfred Sarkissian

PurposeBig Data (BD) is not only a quintessential part of many economic activities but also has evolved into a veritable business ecosystem. However, most Big Data ecosystem (BDE) models have a technical, bottom-up focus and mostly lack the capability for a broad socioeconomic analysis. This paper identifies the Millennium Ecosystem Assessment (MA) as a useful, operational framework and uses a metaphorical analogy to adapt it for the BDE. The top-down approach adopted here allows for seeing the big picture of the BD ecosystem. Meeting “end-user needs” is the main objective of the proposed BDE framework.Design/methodology/approachThe methodology of this paper consists of two parts. First, the MA is adapted for the BDE through a metaphorical analogy. Then, to operationalize and validate the proposed framework, it is applied to an emerging BD ecosystem.FindingsIn total, four types of services are offered in the BD ecosystem: provisioning information and products; regulating; cultural and supporting services. Direct and indirect drivers of change impact ecosystem processes such as BD service provision. Based on the assessment results, interventions can be devised to remedy problems, sustain the ecosystem or accelerate growth. The proposed BDE assessment framework is applied to an emerging BDE as an example of operationalization and validation of the proposed BDE framework.Originality/valueThe strengths of the proposed BDE framework is that, in contrast to existing frameworks that are technical and bottom-up, it is constructed top-down by a metaphorical analogy from the proven MA framework. It is a generic framework with the ultimate objective of meeting the “end-user needs” and does not focus on a single sector or firm. Also, the proposed BDE framework is multi-faceted and considers broad socioeconomic issues such as regulating, cultural and supporting services and drivers of change.


2019 ◽  
Author(s):  
Tina Heger ◽  
Carlos Aguilar ◽  
Isabelle Bartram ◽  
Raul Rennó Braga ◽  
Gregory P. Dietl ◽  
...  

In the current era of Big Data, existing synthesis tools (e.g. formal meta-analysis) are useful for handling the deluge of data and information. However, there is a need for complementary tools that help to (i) structure data and information, (ii) closely connect evidence to theory and (iii) further develop theory. We present the hierarchy-of-hypotheses (HoH) approach to address these issues. In an HoH, hypotheses are conceptually and visually structured in a hierarchically nested way, where the lower branches can be directly connected to empirical results. Used as an evidence-driven, bottom-up approach, it can (i) show connections between empirical results, even when derived through diverse approaches; and (ii) indicate under which circumstances hypotheses are applicable. Used as a theory-driven, top-down method, it helps uncover mechanistic components of hypotheses. We offer guidance on how to build an HoH, provide examples from population and evolutionary biology and propose terminological clarifications.


PsycCRITIQUES ◽  
2005 ◽  
Vol 50 (19) ◽  
Author(s):  
Michael Cole
Keyword(s):  
Top Down ◽  

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