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Name
Bulgarian Digital Mathematics Library at IMI-BAS
Type
Institutional Repository
Items
2360 Publications
Compatibility
OpenAIRE Basic (DRIVER OA)
OAI-PMH
http://sci-gems.math.bas.bg:8080/oai/request
More information
Detailed data provider information (OpenDOAR)

 

  • Probabilistic Models in Cryptography, Coding Theory and Tests for PRNG

    2000 Mathematics Subject Classification: 94A29, 94B70 This paper is a review of some applications of probabilistic models in cryptography, coding theory and tests for pseudo-random number generators (PRNG). Using quasigroup transformations, we design streams ciphers and error-correcting codes with suitable properties. Some tests for pseudo random number generators are designed, too. They are based on random walk on discrete coordinate plane.

    Mathematical Optimization for the Train Timetabling Problem

    AMS Subj. Classification: 90C57; 90C10; Rail transportation is very rich in terms of problems that can be modelled and solved using mathematical optimization techniques. The train scheduling problem as the most important part of a rail operating policy has a very significant impact on a rail company profit considering the fact that from the quality of a train timetable depends a flow of three most important resources on rail network: cars, locomotives and crews. The train timetabling problem a...

    Дигиталните библиотеки – информационни маркери на образованието

    Доклад, поместен в сборника на Националната конференция "Образованието в информационното общество", Пловдив, май 2011 г. Дигиталните библиотеки са виртуалните репозиториуми на всички видове източници на информация (документални, аудиовизуални и електронни), без които образованието е невъзможно в съвременния свят. Централната библиотека на БАН /ЦБ БАН/ вече над пет години участва посредством международни проекти в изграждането на тематични дигитални библиотеки на високо инфор...

    A Bimodality Test in High Dimensions

    We present a test for identifying clusters in high dimensional data based on the k-means algorithm when the null hypothesis is spherical normal. We show that projection techniques used for evaluating validity of clusters may be misleading for such data. In particular, we demonstrate that increasingly well-separated clusters are identified as the dimensionality increases, when no such clusters exist. Furthermore, in a case of true bimodality, increasing the dimensionality ma...
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