We consider the robust phase retrieval problem of recovering the unknown signal from the magnitude-only measurements, where the measurements can be contaminated by both sparse arbitrary corruption and bounded random noise. We propose a new nonconvex algorithm for robust phase retrieval, namely Robust Wirtinger Flow to jointly estimate the unknown signal and the sparse corruption. We show that o...

In addition to other benefits, e-Government can help alleviate corruption in nations by reducing the existing information asymmetries. Though governments are interested in understanding the impacts of e-Government on the level of national corruption, there are relatively few empirical studies that analyze this aspect. Motivated by this gap, we first develop a theoretical model for eGovernment i...

In this study we explore in detail the causes of corruption in China using two different sets of data at the regional level (provinces and cities). We observe that regions with more anti-corruption efforts, histories of British rule, higher openness, more access to media and relatively higher wages of government employees are markedly less corrupt; while social heterogeneity, regulation, abunda...

Government Procurement is an important measure by which the government can guide economic development direction, protect and support national (or local) industry and implement macro-economic control. This paper analyzes corruption and collusive behaviors in government procurement practice in a Game Theory perspective. First, using Willenbrock’s bidding model to analyze the rent-seeking behavior...

systematic and widespread corruption; a problem in russia’s transition period russia is among those countries that are grappled with widespread and systematic corruption in state organizations. meanwhile, different russian governments have failed to reduce the scope of corruption. this article studies nature, roots and repercussions of corruption and analyzes approaches to combat it in russia. ...

Shadow Economies and Corruption All Over the World: What Do We Really Know? Estimations of the size and development of the shadow economy for 145 countries, including developing, transition and highly developed OECD economies over the period 1999 to 2003 are presented. The average size of the shadow economy (as a percent of “official” GDP) in 2002/03 in 96 developing countries is 38.7%, in 25 t...

Downloading Wisdom from Online Crowds The internet and other large textual databases contain billions of documents: is there useful information in the number of documents written about different topics? We propose, based on the premise that the occurrence of a phenomenon increases the likelihood that people write about it, that the relative frequency of documents discussing a phenomenon can be ...

Corruption is one of the main challenges in governments. According to many international reports, corruption in developing countries is more than developed countries. On the other hand, one of the advantages of e-government is accountability and transparency. Therefore e-government can be introduced as a solution to reduce corruption in government activities. This paper studied the effect of e-...

We demonstrate algorithm-based fault tolerance for silent, transient data corruption in “black-box” preconditioners. We consider both additive Schwarz domain decomposition with an ILU(k) subdomain solver, and algebraic multigrid, both implemented in the Trilinos library. We evaluate faults that corrupt preconditioner results in both single and multiple MPI ranks. We then analyze how our approac...

the efficiency of the institutions and the level of their effectiveness in trading among the countries are pretty new subjects that have been considered in recent studies. many researchers believe that the corruption would cause a reduction in trading among the countries. on the other hand some others assume corruption can help to facilitate the transactions process. the main purpose of this pa...