Mathematics / Math.OC

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Confirmation of Lagrange Hypothesis for Twisted Elastic Rod

Confirmation of Lagrange Hypothesis for Twisted Elastic Rod

: ๋ณธ ๋…ผ๋ฌธ์€ ๊ตฌ์กฐ ์ตœ์ ํ™” ๋ถ„์•ผ์—์„œ ์ค‘์š”ํ•œ ์—ญํ• ์„ ํ•˜๋Š” ๋ผ๊ทธ๋ž‘์ฃผ ๋ฌธ์ œ๋ฅผ ๋‹ค๋ฃจ๋ฉฐ, ํŠนํžˆ ๊ทธ๋ฆฐํž ๋ถ€๋Ÿฌ์ง ๋ฌธ์ œ์— ๋Œ€ํ•œ ์ƒˆ๋กœ์šด ์ ‘๊ทผ๋ฒ•์„ ์ œ์‹œํ•ฉ๋‹ˆ๋‹ค. ์ด ์—ฐ๊ตฌ๋Š” ์–‡์€ ํƒ„์„ฑ ๋ง‰๋Œ€์˜ ์ตœ์  ํ˜•ํƒœ๋ฅผ ์ฐพ๋Š”๋ฐ ์ดˆ์ ์„ ๋งž์ถ”๊ณ  ์žˆ์œผ๋ฉฐ, ์ด๋ฅผ ํ†ตํ•ด ๋ผ๊ทธ๋ž‘์ฃผ ๊ฐ€์„ค์ด ์‹ค์ œ๋กœ ์œ ํšจํ•จ์„ ์ฆ๋ช…ํ•˜๊ณ ์ž ํ•ฉ๋‹ˆ๋‹ค. 1. ์„œ๋ก  ์„œ๋ก ์—์„œ๋Š” ๋ณธ ๋…ผ๋ฌธ์˜ ์ฃผ์š” ๋ชฉํ‘œ์™€ ์—ฐ๊ตฌ ๋ฐฐ๊ฒฝ์„ ์„ค๋ช…ํ•ฉ๋‹ˆ๋‹ค. ๊ตฌ์กฐ ์ตœ์ ํ™” ๊ณผํ•™์—์„œ ์ค‘์š”ํ•œ ๋ฌธ์ œ ์ค‘ ํ•˜๋‚˜์ธ ๊ทธ๋ฆฐํž ๋ถ€๋Ÿฌ์ง ๋ฌธ์ œ๋ฅผ ๋‹ค๋ฃจ๋ฉฐ, ์ด ๋ฌธ์ œ๋Š” ์–‡์€ ํƒ„์„ฑ ๋ง‰๋Œ€๊ฐ€ ํŠน์ • ๋ชจ๋ฉ˜ํŠธ ํ•˜์ค‘์— ๋Œ€ํ•ด ์–ด๋–ป๊ฒŒ ํœ˜์–ด์ง€๋Š”์ง€๋ฅผ ๋ถ„์„ํ•˜๋Š” ๊ฒƒ์ž…๋‹ˆ๋‹ค. ๋ณธ ๋…ผ๋ฌธ์—์„œ๋Š” ๋ผ๊ทธ๋ž‘์ฃผ

MATH-PH Mathematics Nonlinear Sciences
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An introduction to ML(n)BiCGStab

1. ์„œ๋ก  ๋ฐ ๋ฐฐ๊ฒฝ ML(n)BiCGStab๋Š” BiCGStab ์•Œ๊ณ ๋ฆฌ์ฆ˜์˜ ์ž์—ฐ์Šค๋Ÿฌ์šด ์ผ๋ฐ˜ํ™”๋กœ, Yeung๊ณผ Chan์— ์˜ํ•ด 1999๋…„ ์†Œ๊ฐœ๋˜์—ˆ๋‹ค. ์ด ์•Œ๊ณ ๋ฆฌ์ฆ˜์€ ์—ฌ๋Ÿฌ ์‹œ์ž‘ ๋žœํฌ๋กœ์Šค ๊ณผ์ •์„ ๊ธฐ๋ฐ˜์œผ๋กœ ํ•˜๋ฉฐ, van der Vorst์˜ BiCGStab์—์„œ ํŒŒ์ƒ๋˜์—ˆ์ง€๋งŒ ๋” ์•ˆ์ •์ ์ด๊ณ  ํšจ์œจ์ ์ธ ์„ฑ๋Šฅ์„ ์ œ๊ณตํ•œ๋‹ค. Sonneveld์™€ van der Vorst๊ฐ€ CGS์™€ BiCGStab๋ฅผ ๊ตฌ์„ฑํ•˜๋Š” ๋ฐ ์‚ฌ์šฉํ•œ ๊ธฐ๋ฒ•์ด ML(n)BiCGStab์—๋„ ์ ์šฉ๋˜์—ˆ๋‹ค. 2. ์•Œ๊ณ ๋ฆฌ์ฆ˜์˜ ์œ ๋„ ๋ฐ ๊ตฌ์กฐ ML(n)BiCGStab๋Š” ์—ฌ๋Ÿฌ ์‹œ์ž‘ ๋ฒกํ„ฐ๋ฅผ ์ด์šฉํ•˜์—ฌ Kryl

Computer Science Mathematics Numerical Analysis
Minimum settling time control design through direct search optimization

Minimum settling time control design through direct search optimization

: ๋ณธ ๋…ผ๋ฌธ์€ PID ์ œ์–ด๊ธฐ์˜ ๋งค๊ฐœ๋ณ€์ˆ˜๋ฅผ ์ตœ์ ํ™”ํ•˜์—ฌ ์‹œ์Šคํ…œ์˜ ์‘๋‹ต ์†๋„์™€ ์•ˆ์ •์„ฑ์„ ๋™์‹œ์— ํ–ฅ์ƒ์‹œํ‚ค๋Š” ๋ฐฉ๋ฒ•์„ ์ œ์‹œํ•œ๋‹ค. ์ด ์—ฐ๊ตฌ์—์„œ๋Š” ์ƒ์Šน ์‹œ๊ฐ„๊ณผ ์ •์ฐฉ ๋ฒ”์œ„ ๋‚ด์—์„œ์˜ ์ตœ๋Œ€ ํŽธ์ฐจ๋ฅผ ์ตœ์†Œํ™”ํ•˜๋Š” ๋ชฉํ‘œ ํ•จ์ˆ˜๋ฅผ ์‚ฌ์šฉํ•˜์—ฌ PID ๊ณ„์ˆ˜

Mathematics Computer Science Systems and Control
Some Software Packages for Partial SVD Computation

Some Software Packages for Partial SVD Computation

1. ์ตœ์ ํ™”๋œ PROPACK PROPACK์€ ๋ถ€๋ถ„ SVD ๊ณ„์‚ฐ์„ ์ˆ˜ํ–‰ํ•˜๋Š” ๋ฐ ๋„๋ฆฌ ์‚ฌ์šฉ๋˜๋Š” ๋„๊ตฌ๋กœ, ์ฃผ๋กœ ํ•ต ๋…ธ๋ฆ„ ์ตœ์†Œํ™” ๋ฌธ์ œ๋ฅผ ํ•ด๊ฒฐํ•˜๊ธฐ ์œ„ํ•ด ํ™œ์šฉ๋ฉ๋‹ˆ๋‹ค. ๋ณธ ์—ฐ๊ตฌ์—์„œ๋Š” PROPACK์˜ ์„ฑ๋Šฅ์„ ํ–ฅ์ƒ์‹œํ‚ค๊ธฐ ์œ„ํ•ด ๊ทธ๋žŒ ์Šˆ๋ฏธํŠธ ์ง๊ตํ™” ๊ณผ์ •์„ ์žฌ๊ตฌ์„ฑํ•˜์—ฌ 15%์—์„œ 20%๊นŒ์ง€ ์†๋„๋ฅผ ๋†’์˜€์Šต๋‹ˆ๋‹ค. ์ด ์ตœ์ ํ™”๋œ ๋ฒ„์ „์€

Mathematical Software Mathematics Computer Science
Injectivity and flatness of semitopological modules

Injectivity and flatness of semitopological modules

๋ณธ ๋…ผ๋ฌธ์€ ๋ณต์žกํ•œ ์ˆ˜ํ•™์  ๊ฐœ๋…์ธ ์ฃผ์ž…์„ฑ(injectivity)๊ณผ ํ‰๋ฉด์„ฑ(flatness) ์‚ฌ์ด์˜ ๊ด€๊ณ„๋ฅผ ํƒ๊ตฌํ•œ๋‹ค. ์ด๋Ÿฌํ•œ ์„ฑ์งˆ๋“ค์€ ๋Œ€์ˆ˜์  ๊ตฌ์กฐ, ํŠนํžˆ ๋ชจ๋“ˆ์—์„œ ์ค‘์š”ํ•œ ์—ญํ• ์„ ํ•˜๋Š”๋ฐ, ์ด๋Š” ํ•จ์ˆ˜ ๊ณต๊ฐ„์ด๋‚˜ ๋ถ„ํฌ ๊ณต๊ฐ„ ๋“ฑ ๋‹ค์–‘ํ•œ ์ˆ˜ํ•™์  ๊ฐ์ฒด์— ์ ์šฉ๋  ์ˆ˜ ์žˆ๋‹ค. ์ฃผ์ž…์„ฑ๊ณผ ํ‰๋ฉด์„ฑ์˜ ๊ธฐ๋ณธ ๊ฐœ๋… ์ฃผ์ž…์„ฑ์€ ๋ชจ๋“ˆ์ด ์–ด๋–ค ํŠน์ •ํ•œ ์กฐ๊ฑด ํ•˜์—์„œ '์ฃผ์ž…'๋˜๋Š” ์„ฑ์งˆ์„ ์˜๋ฏธํ•œ๋‹ค. ์˜ˆ๋ฅผ ๋“ค์–ด, A ๋ชจ๋“ˆ E'๊ฐ€ ฯƒ(E', E)์— ๋Œ€ํ•œ ๋ฐ˜ํ† ํด๋กœ์ง€์ ์ด๋ผ๋ฉด, k ๋ฒกํ„ฐ ๊ณต๊ฐ„ E๋Š” A์— ๋Œ€ํ•œ ์šฐ์ธก ๋ชจ๋“ˆ์ด ๋œ๋‹ค. ์ด ๊ฒฝ์šฐ, ์ฃผ์ž…์„ฑ์€ ๋ชจ๋“ˆ ์‚ฌ์ด์˜ ๋งคํ•‘์ด ์ผ๋Œ€์ผ(one to

Mathematics

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