506 research outputs found

    Settling for limited privacy: how much does it help?

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    This thesis explores practical and theoretical aspects of several privacy-providing technologies, including tools for anonymous web-browsing, verifiable electronic voting schemes, and private information retrieval from databases. State-of-art privacy-providing schemes are frequently impractical for implementational reasons or for sheer information-theoretical reasons due to the amount of information that needs to be transmitted. We have been researching the question of whether relaxing the requirements on such schemes, in particular settling for imperfect but sufficient in real-world situations privacy, as opposed to perfect privacy, may be helpful in producing more practical or more efficient schemes. This thesis presents three results. The first result is the introduction of caching as a technique for providing anonymous web-browsing at the cost of sacrificing some functionality provided by anonymizing systems that do not use caching. The second result is a coercion-resistant electronic voting scheme with nearly perfect privacy and nearly perfect voter verifiability. The third result consists of some lower bounds and some simple upper bounds on the amount of communication in nearly private information retrieval schemes; our work is the first in-depth exploration of private information schemes with imperfect privacy

    Fullerene van der waals Oligomers as electron traps

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    Density functional theory calculations indicate that van der Waals fullerene dimers and larger oligomers can form interstitial electron traps in which the electrons are even more strongly bound than in isolated fullerene radical anions. The fullerenes behave like super atoms , and the interstitial electron traps represent one-electron intermolecular σ-bonds. Spectroelectrochemical measurements on a bis-fullerene-substituted peptide provide experimental support. The proposed deep electron traps are relevant for all organic electronics applications in which non-covalently linked fullerenes in van der Waals contact with one another serve as n-type semiconductors

    Integrating metalloporphycenes into p-type NiO-based dye-sensitized solar cells

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    In the current work, we have explored a novel synthetic route towards metalated porphycenes and their use in p-type NiO-based dye-sensitized solar cells. Particular emphasis is placed on the influence that the relative positioning of the anchoring group exerts on the DSSC performance

    ОБЧИСЛЮВАЛЬНА СХЕМА ІДЕНТИФІКАЦІЇ РОЗПОДІЛІВ З КЛАСУ НОРМАЛЬНОГО

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    A computing scheme for identification and restoration of distribution from normal distribution class is offered. It is notable for identification of a spline-normal distribution by automatic search of spline nodes on a probability paper.Предложена вычислительная схема идентификации распределений из класса нормального, которая отличается от существующих возможностью идентификации сплайн-распределения путем автоматизированного поиска узлов сплайна на вероятностной бумаге.Запропоновано обчислювальну схему ідентифікації розподілів з класу нормального, яка відрізняється від існуючих можливістю ідентифікації сплайн-розподілу шляхом автоматизованого пошуку вузлів сплайна на ймовірнісному папері

    ОБЧИСЛЮВАЛЬНІ СХЕМИ ІДЕНТИФІКАЦІЇ СПЛАЙН-РОЗПОДІЛІВ ЗА ЙМОВІРНІСНИМ ПАПЕРОМ

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    The computing schemes of spline-distributions automated identification using probability paper are improved. They are tested on modeling data from normal, logarithmic normal, exponential and Weibull spline-distributions.Усовершенствованы предложенные вычислительные схемы автоматизированной идентификации сплайн-распределений по вероятностной бумаге. Проведено их тестирование на данных имитационного моделирования из нормального, логарифмически нормального, экспоненциального и Вейбулла сплайн-распределений.Удосконалено запропоновані обчислювальні схеми автоматизованої ідентифікації сплайн-розподілів за ймовірнісним папером. Здійснено їх тестування на даних імітаційного моделювання з нормального, логарифмічно нормального, експоненціального та Вейбулла сплайн-розподілів

    Delay and distortion of slow light pulses by excitons in ZnO

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    Light pulses propagating through ZnO undergo distortions caused by both bound and free excitons. Numerous lines of bound excitons dissect the pulse and induce slowing of light around them, to the extend dependent on their nature. Exciton-polariton resonances determine the overall pulse delay and attenuation. The delay time of the higher-energy edge of a strongly curved light stripe approaches 1.6 ns at 3.374 eV with a 0.3 mm propagation length. Modelling the data of cw and time-of-flight spectroscopies has enabled us to determine the excitonic parameters, inherent for bulk ZnO. We reveal the restrictions on these parameters induced by the light attenuation, as well as a discrepancy between the parameters characterizing the surface and internal regions of the crystal.Comment: 4 pages, 4 figure

    Specificity of the Concertmaster’s Work At the Vocal Department of a Music Educational Institution (College)

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    The article considers the specifics of work of a concertmaster at the vocal Department of a secondary vocational music institution and the specific features of work with novice and professional singers. The professional, psychological, pedagogical and artistic qualities of a concertmaster required for training vocalists are described. The role of a piano concertmaster in the educational process at a vocal department of an educational institution is defined. Examples of modern concertmaster projects are considered. The article describes experience of concertmasters who performed with outstanding musicians. The issues of using concertmaster’s experience, gained during work with professional singers in a musical theater and in a music recording studio, in the training process are considered.Рассмотрены вопросы специфики работы концертмейстера на вокальном отделении среднего профессионального музыкального учебного заведения, а также особенности работы с начинающими и профессиональными певцами. Описаны профессиональные, психолого-педагогические, артистические качества концертмейстера, необходимые при обучении вокалистов. Определена роль пианиста-концертмейстера в образовательном процессе на вокальном отделении образовательной организации. Рассмотрены примеры современных концертмейстерских проектов. Описан опыт работы концертмейстеров выдающихся музыкантов. Рассмотрены вопросы использования в процессе обучения опыта концертмейстера, приобретенного при работе с профессиональными певцами, в музыкальном театре, в студии музыкальной звукозаписи
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