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X-WR-CALDESC:Събития за Institute of Mathematics and Informatics
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DTSTART;TZID=Europe/Sofia:20220927T140000
DTEND;TZID=Europe/Sofia:20220927T150000
DTSTAMP:20260622T120955
CREATED:20220926T080910Z
LAST-MODIFIED:20220926T085500Z
UID:12862-1664287200-1664290800@math.bas.bg
SUMMARY:Семинар на секция "Математически основи на информатиката"
DESCRIPTION:На 27 септември 2022 г. (вторник) от 14:00 часа в Заседателната зала на ИМИ-БАН\nще се проведе заседание на семинара на секция „Математически основи на информатиката”. Доклад на тема:\n\nTightening the Generalized Levenshtein Bound (GLB) on Aperiodic Correlation of Quasi-Complementary Sequence Sets\n\nще изнесе\nд-р Зилонг Лиу от Университета на Есекс.\n\nГостуването на д-р Лиу се осъществява по програма ПИКОМ.\nДокладът ще може да бъде проследен и по зуум\, на линк https://us02web.zoom.us/j/82208909334?pwd=VkxhSzdNYmpWdGdjNnZySFpQSUxTZz09\n\nАбстракт:\n\nLevenshtein improved the aperiodic Welch bound by using the key idea that the weighted mean square aperiodic correlation of any sequence subsets over the complex roots of unity is equal to or greater than that of the set comprised of all sequences over the complex roots of unity. Following this key idea\, I will introduce Generalized Levenshtein Bound (GLB) [1] for quasi-complementary sequence sets (QCSS)\, which refer to a set of two-dimensional arrays with low aperiodic correlation sums. The GLB\, in the form of a fractional quadratic function of the simplex weight vector\, is non-convex in general and thus its tightening is challenging. In the second part of this talk\, I will present a frequency-domain optimization approach which tightens GLB in an analytical way [2]. \nThis talk will be based on my following papers: \n[1] Z. Liu\, Y. L. Guan and W. H. Mow\, “A Tighter Correlation Lower Bound for Quasi-Complementary Sequence Sets\,” IEEE Transactions on Information Theory\, vol. 60\, no. 1\, pp. 388-396\, Jan. 2014. \n[2] Z. Liu\, Y. L. Guan and W. H. Mow\, “Asymptotically Locally Optimal Weight Vector Design for a Tighter Correlation Lower Bound of Quasi-Complementary Sequence Sets\,” IEEE Transactions on Signal Processing\, vol. 65\, no. 12\, pp. 3107-3119\, June 2017.
URL:https://math.bas.bg/event/%d1%81%d0%b5%d0%bc%d0%b8%d0%bd%d0%b0%d1%80-%d0%bd%d0%b0-%d1%81%d0%b5%d0%ba%d1%86%d0%b8%d1%8f-%d0%bc%d0%b0%d1%82%d0%b5%d0%bc%d0%b0%d1%82%d0%b8%d1%87%d0%b5%d1%81%d0%ba%d0%b8-%d0%be%d1%81%d0%bd%d0%be-15/
LOCATION:Институт по математика и информатика – БАН\, Block 8\, 1113 БАН IV км.\, София\, Bulgaria
CATEGORIES:Редовен семинар
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20220927T160000
DTEND;TZID=Europe/Sofia:20220927T173000
DTSTAMP:20260622T120955
CREATED:20220926T123342Z
LAST-MODIFIED:20220926T123342Z
UID:12878-1664294400-1664299800@math.bas.bg
SUMMARY:Семинар на Международния център за математически науки
DESCRIPTION:На 27.09.2022 г.\, вторник\, от 16:00 часа в зала 403 ще състои поредната сбирка на семинара на Международния център за математически науки (МЦМН). \nДоклад на тема: \nРазрешаване на особености и нормирания\nще изнесе д-р Андрей Бенгус-Ласние (Париж)\, който започва постдокторантура в ИМИ-БАН по програма ПИКОМ. \nЗа допълнителна информация вижте https://icms.bg/singularities-resolutions-and-valuations-talk-by-andrei-bengus-lasnier/.
URL:https://math.bas.bg/event/%d1%81%d0%b5%d0%bc%d0%b8%d0%bd%d0%b0%d1%80-%d0%bd%d0%b0-%d0%bc%d0%b5%d0%b6%d0%b4%d1%83%d0%bd%d0%b0%d1%80%d0%be%d0%b4%d0%bd%d0%b8%d1%8f-%d1%86%d0%b5%d0%bd%d1%82%d1%8a%d1%80-%d0%b7%d0%b0-%d0%bc%d0%b0/
LOCATION:Институт по математика и информатика – БАН\, Block 8\, 1113 БАН IV км.\, София\, Bulgaria
CATEGORIES:Редовен семинар
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