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Secret Sharing Schemes for General Access Structures
, M.Sc. Thesis Sharif University of Technology ; Eghlidos, Taraneh (Supervisor)
Abstract
Secret sharing scheme is a method for distributing the secret (secret information) among a set of participants in such a way that only the authorized sets can recover the secret and the unauthorized sets could not. In a perfect secret sharing scheme, unauthorized sets cannot get any additional (i.e. a posteriori) information about the possible value of the secret. In these schemes, to prevent information leakage and increase communication efficiency, the size of the share should be as close to the secret size as possible. In other words, finding the shares with reasonable size which results in an optimal information rate for a given access structure, improves the efficiency of the scheme....
On Körner-Marton's sum modulo two problem
, Article IWCIT 2015 - Iran Workshop on Communication and Information Theory, 6 May 2015 through 7 May 2015 ; May , 2015 ; 9781479982356 (ISBN) ; Gohari, A ; Aref, M. R ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2015
Abstract
In this paper we study the sum modulo two problem proposed by Körner and Marton. In this source coding problem, two transmitters who observe binary sources X and Y, send messages of limited rate to a receiver whose goal is to compute the sum modulo of X and Y. This problem has been solved for the two special cases of independent and symmetric sources. In both of these cases, the rate pair (H(X|Y), H(Y|X)) is achievable. The best known outer bound for this problem is a conventional cut-set bound, and the best known inner bound is derived by Ahlswede and Han using a combination of Slepian-Wolf and Körner-Marton's coding schemes. In this paper, we propose a new outer bound which is strictly...
Reliable source transmission over relay networks with side information
, Article 2009 IEEE International Symposium on Information Theory, ISIT 2009, Seoul, 28 June 2009 through 3 July 2009 ; 2009 , Pages 699-703 ; 21578102 (ISSN); 9781424443130 (ISBN) ; Akhbari, B ; Mohsenzadeh, V ; Aref, M. R ; Sharif University of Technology
2009
Abstract
In this paper, we consider reliable transmission of a discrete memoryless source over multi-relay networks with correlated Side Information (SI) available at the relay nodes and the final receiver. We obtain a necessary condition for reliable source transmission over a multi-terminal network with SI, which results in a necessary condition for a multi-relay network with SI, as a special case. We also propose a separate source-channel coding scheme, and based on it, a sufficient condition for a multi-relay network with SI is derived. Based on a partitioning method and the nature of a degraded relay network, we propose another coding scheme which results in a sufficient condition for a degraded...
Practical Analysis Of Return to Education In Iran Supply And Demand Factors
, M.Sc. Thesis Sharif University of Technology ; Madanizadeh, Ali (Supervisor) ; Vesal, Mohammad (Supervisor)
Abstract
In this research supply and demand factors regarding skill premium, ratio of revenue of college to non-college workers, in years 1984 to 2012 have been investigated. Three periods 1984 to 1995, 1995 to 2005 and 2015 to 2012 can be identified. In all three periods relative supply of college workers has increased. Demand in the periods have been constant, increasing and decreasing respectively and with the effect of demand has led to decreasing, increasing and decreasing trend of skill premium in these periods respectively. Share of low skilled sectors like construction, trade and agriculture in second period declined which led to increased demand for high skilled labor .An opposite effect...
Does the short-term boost of renewable energies guarantee their stable long-term growth? Assessment of the dynamics of feed-in tariff policy
, Article Renewable Energy ; Volume 159 , October , 2020 , Pages 1252-1268 ; Hamed Shakouri, G ; Mashayekhi, A. N ; Kazemi, A ; Sharif University of Technology
Elsevier Ltd
2020
Abstract
Feed-in tariff (FiT) is one of the most efficient ways that many governments throughout the world use to stimulate investment in renewable energies (REs) technology. For governments, financial management of the policy could be challenging as it needs a considerable amount of budget to support RE producers during the long remuneration period. In this paper, it has been illuminated that the early growth of REs capacity could be a temporary boost. And the socio-economic structure of the system will backlash the policy if some social mechanisms are not considered. Social tolerance for paying REs tax and potential investors’ trust emanated from budget-related mechanisms -which have rarely been...