Computer Science / Networking

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An Efficient Paging Algorithm for Multi-Carrier CDMA System

An Efficient Paging Algorithm for Multi-Carrier CDMA System

: ๋ณธ ๋…ผ๋ฌธ์€ ๋ฌด์„  ํ†ต์‹  ๋„คํŠธ์›Œํฌ์—์„œ ๋ชจ๋ฐ”์ผ ์Šคํ…Œ์ด์…˜(MS)์„ ํšจ๊ณผ์ ์œผ๋กœ ์ถ”์ ํ•˜๊ธฐ ์œ„ํ•œ ์ƒˆ๋กœ์šด ํŽ˜์ด์ง€๋ง(Pageing) ์•Œ๊ณ ๋ฆฌ์ฆ˜์„ ์ œ์•ˆํ•œ๋‹ค. ํŠนํžˆ, ๋‹ค์ค‘ ์บ๋ฆฌ์–ด CDMA ์‹œ์Šคํ…œ์—์„œ MS๋ฅผ ๋™์‹œ์— ๊ฒ€์ƒ‰ํ•  ์ˆ˜ ์žˆ๋Š” ํšจ์œจ์ ์ธ ๋ฐฉ๋ฒ•์„ ํƒ๊ตฌํ•˜๊ณ  ์žˆ๋‹ค. ๊ธฐ์กด ๋ฌธ์ œ์  ๊ธฐ์กด์˜ ๋‹ค์ค‘ ์บ๋ฆฌ์–ด CDMA ์‹œ์Šคํ…œ์—์„œ๋Š” MS๊ฐ€ ํ•œ ๋ฒˆ์— ํ•˜๋‚˜์˜ ์บ๋ฆฌ์–ด ์ฃผํŒŒ์ˆ˜๋งŒ ์ฒญ์ทจํ•  ์ˆ˜ ์žˆ์–ด, ๋ชจ๋“  ์‚ฌ์šฉ์ž๋ฅผ ๋™์‹œ์— ๊ฒ€์ƒ‰ํ•˜๋Š” ๋ฐ ํ•œ๊ณ„๊ฐ€ ์žˆ์—ˆ๋‹ค. ์ด๋กœ ์ธํ•ด ํŽ˜์ด์ง€ ์ฑ„๋„ ์ž์›์ด ๋น„ํšจ์œจ์ ์œผ๋กœ ํ™œ์šฉ๋˜๋Š” ๋ฌธ์ œ๊ฐ€ ๋ฐœ์ƒํ–ˆ๋‹ค. ์ œ์•ˆ๋œ ์•Œ๊ณ ๋ฆฌ์ฆ˜ ๋ณธ ๋…ผ๋ฌธ์€ ์ด๋Ÿฌํ•œ ๋ฌธ์ œ๋ฅผ ํ•ด๊ฒฐํ•˜๊ธฐ ์œ„ํ•ด ๋™์‹œ ๊ฒ€

Networking System Computer Science
Comparison Of The Consumption Of Resources Between HTTP And SIP

Comparison Of The Consumption Of Resources Between HTTP And SIP

๋ณธ ๋…ผ๋ฌธ์€ HTTP์™€ SIP ํ”„๋กœํ† ์ฝœ์˜ ์ž์› ์†Œ๋น„๋ฅผ ๋น„๊ต ๋ถ„์„ํ•˜๋Š”๋ฐ ์ดˆ์ ์„ ๋งž์ถ”๊ณ  ์žˆ๋‹ค. VoIP ๊ธฐ์ˆ ์˜ ์„ฑ์žฅ๊ณผ ํ•จ๊ป˜, Asterisk๋ผ๋Š” ์˜คํ”ˆ์†Œ์Šค ์†”๋ฃจ์…˜์ด ๋„๋ฆฌ ์‚ฌ์šฉ๋˜๊ณ  ์žˆ์œผ๋ฉฐ, ์ด๋ฅผ ํ†ตํ•ด ์ €๋น„์šฉ์œผ๋กœ ํ†ต์‹  ์ธํ”„๋ผ๋ฅผ ๊ตฌ์ถ•ํ•  ์ˆ˜ ์žˆ๋Š” ๊ฐ€๋Šฅ์„ฑ์„ ๋ณด์—ฌ์ฃผ๊ณ  ์žˆ๋‹ค. ์‹คํ—˜ ํ™˜๊ฒฝ ๋ฐ ๋ฐฉ๋ฒ•๋ก  ์‹คํ—˜์€ Dell Optiplex GX 110 ์„œ๋ฒ„์™€ ํด๋ผ์ด์–ธํŠธ๋ฅผ ์ด์šฉํ•˜์—ฌ ์ˆ˜ํ–‰๋˜์—ˆ์œผ๋ฉฐ, ์šด์˜์ฒด์ œ๋Š” Debian GNU/Linux๊ฐ€ ์‚ฌ์šฉ๋˜์—ˆ๋‹ค. ์›น ์„œ๋ฒ„๋กœ Apache๋ฅผ, VoIP ์„œ๋ฒ„๋กœ Asterisk๋ฅผ ๊ฐ๊ฐ ์‚ฌ์šฉํ•˜์˜€๋‹ค. ๋ฉ”๋ชจ๋ฆฌ ์†Œ๋น„๋Ÿ‰์„ ์ธก์ •ํ•˜๊ธฐ ์œ„ํ•ด TOP

Networking Computer Science
E-DTN : A Multi-Interface Energy DTN Gateway

E-DTN : A Multi-Interface Energy DTN Gateway

: ๋ณธ ๋…ผ๋ฌธ์€ ์ธ๋„ ๋†์ดŒ ์ง€์—ญ์˜ ์ „๋ ฅ ๋ถ€์กฑ ๋ฌธ์ œ๋ฅผ ํ•ด๊ฒฐํ•˜๊ธฐ ์œ„ํ•ด ์ž์ „๊ฑฐ ๋™๋ ฅ์„ ํ™œ์šฉํ•œ ๋ฌด์„  ์„ผ์„œ ๋„คํŠธ์›Œํฌ ๊ฒŒ์ดํŠธ์›จ์ด์ธ E DTN์„ ์ œ์•ˆํ•˜๊ณ , ์ด๋ฅผ ๊ตฌํ˜„ ๋ฐ ํ‰๊ฐ€ํ•œ๋‹ค. ์ด ์‹œ์Šคํ…œ์€ Bluetooth, Wi Fi, GPRS ๊ธฐ์ˆ ์„ ํ†ตํ•ฉํ•˜์—ฌ ๋ฐ์ดํ„ฐ ์ˆ˜์ง‘๊ณผ ์ธํ„ฐ๋„ท ์—ฐ๊ฒฐ์„ ๊ฐ€๋Šฅํ•˜๊ฒŒ ํ•˜๋ฉฐ, ํŠนํžˆ ์ž์ „๊ฑฐ ๋™๋ ฅ์œผ๋กœ ์—๋„ˆ์ง€๋ฅผ ์ƒ์„ฑํ•˜๊ณ  ์ง€์—ฐ/์ค‘๋‹จ ๋‚ด์„ฑ ๋„คํŠธ์›Œํฌ(DTN) ์Šคํƒ์„ ํ™œ์šฉํ•ด ์—๋„ˆ์ง€ ํšจ์œจ์„ฑ์„ ๊ทน๋Œ€ํ™”ํ•œ๋‹ค. 1. ์„œ๋ก  ์„œ๋ก ์—์„œ๋Š” ์„ผ์„œ ๋„คํŠธ์›Œํฌ ํด๋Ÿฌ์Šคํ„ฐ์—์„œ ๋ฐ์ดํ„ฐ๋ฅผ ์ „๋‹ฌํ•˜๋Š” ๋‹ค์–‘ํ•œ ๊ฒŒ์ดํŠธ์›จ์ด ๊ธฐ์ˆ ์— ๋Œ€ํ•ด ์„ค๋ช…ํ•˜๊ณ , ์ธ๋„ ๋†์ดŒ ์ง€์—ญ์˜ ์ฃผ์š” ์žฅ์• ๋ฌผ ์ค‘

Networking Computer Science
A Novel Adaptive Routing through Fitness Function Estimation Technique with Multiple QoS Parameters Compliance

A Novel Adaptive Routing through Fitness Function Estimation Technique with Multiple QoS Parameters Compliance

๋ณธ ๋…ผ๋ฌธ์€ ๋„คํŠธ์›Œํฌ ๋ผ์šฐํŒ… ๊ธฐ์ˆ  ์ค‘ ํ•˜๋‚˜์ธ ๊ฑฐ๋ฆฌ ๋ฒกํ„ฐ(DV) ํ”„๋กœํ† ์ฝœ์„ ๊ฐœ์„ ํ•˜๋Š” ๋ฐฉ๋ฒ•์„ ์ œ์‹œํ•˜๊ณ  ์žˆ์Šต๋‹ˆ๋‹ค. ํŠนํžˆ, ๋‹ค์ค‘ QoS ๋งค๊ฐœ๋ณ€์ˆ˜๋ฅผ ์ค€์ˆ˜ํ•˜๋ฉด์„œ๋„ ํšจ์œจ์ ์ธ ๊ฒฝ๋กœ ์„ ํƒ์ด ๊ฐ€๋Šฅํ•œ ์ƒˆ๋กœ์šด ์ ์‘ํ˜• ๋ผ์šฐํŒ… ๊ธฐ๋ฒ•์— ์ดˆ์ ์„ ๋งž์ถ”๊ณ  ์žˆ์Šต๋‹ˆ๋‹ค. 1. ์—ฐ๊ตฌ ๋ฐฐ๊ฒฝ ๋ฐ ๋ชฉ์  ๋ผ์šฐํŒ…์€ ๋„คํŠธ์›Œํฌ์—์„œ ๋ฐ์ดํ„ฐ ํŒจํ‚ท์„ ์›ํ•˜๋Š” ๋ชฉ์ ์ง€๊นŒ์ง€ ์ „์†กํ•˜๊ธฐ ์œ„ํ•œ ํ•ต์‹ฌ ๊ธฐ์ˆ ์ž…๋‹ˆ๋‹ค. ๊ทธ๋Ÿฌ๋‚˜, ๊ธฐ์กด์˜ DV ์•Œ๊ณ ๋ฆฌ์ฆ˜์€ ๋ผ์šฐํŒ… ๋ฃจํ”„์™€ count to infinity ๋ฌธ์ œ ๋“ฑ์˜ ํ•œ๊ณ„๋ฅผ ๊ฐ€์ง€๊ณ  ์žˆ์Šต๋‹ˆ๋‹ค. ์ด๋Ÿฌํ•œ ๋ฌธ์ œ์ ์„ ํ•ด๊ฒฐํ•˜๊ณ ์ž ๋ณธ ๋…ผ๋ฌธ์—์„œ๋Š” ์ŠคํŒฌ๋‹ ํŠธ๋ฆฌ ์ ‘๊ทผ ๋ฐฉ์‹์„ ํ™œ์šฉํ•œ ์ƒˆ๋กœ์šด

Networking Computer Science
Performance Measurement of the Heterogeneous Network

Performance Measurement of the Heterogeneous Network

์ด ๋…ผ๋ฌธ์€ M/M/2 ํ ์‹œ์Šคํ…œ์„ ํ™œ์šฉํ•˜์—ฌ ๋„คํŠธ์›Œํฌ ์ง€์—ฐ ๋ฌธ์ œ๋ฅผ ๋ถ„์„ํ•˜๊ณ  ์žˆ์Šต๋‹ˆ๋‹ค. ์ด ๋ชจ๋ธ์€ ๋‘ ๊ฐœ์˜ ์„œ๋ฒ„๋กœ ๊ตฌ์„ฑ๋˜๋ฉฐ, ๊ฐ ์„œ๋ฒ„๋Š” ์„œ๋กœ ๋‹ค๋ฅธ ์ฒ˜๋ฆฌ ๋Šฅ๋ ฅ์„ ๊ฐ€์ง€๊ณ  ์žˆ์–ด ์ž‘์—… ์Šค์ผ€์ค„๋ง ๋ฐฉ์‹์€ FCFS(First Come First Served)์ž…๋‹ˆ๋‹ค. 1. M/M/2 ํ ์‹œ์Šคํ…œ M/M/2 ํ ์‹œ์Šคํ…œ์€ ๋„คํŠธ์›Œํฌ ์ง€์—ฐ ๋ฌธ์ œ๋ฅผ ํšจ๊ณผ์ ์œผ๋กœ ๋ชจ๋ธ๋งํ•˜๊ธฐ ์œ„ํ•œ ๋„๊ตฌ๋กœ, ์ด ์‹œ์Šคํ…œ์˜ ์ฃผ์š” ํŠน์ง• ์ค‘ ํ•˜๋‚˜๋Š” ๋‘ ๊ฐœ์˜ ์„œ๋ฒ„๊ฐ€ ์„œ๋กœ ๋‹ค๋ฅธ ์ฒ˜๋ฆฌ ๋Šฅ๋ ฅ์„ ๊ฐ€์ง€๊ณ  ์žˆ๋‹ค๋Š” ์ ์ž…๋‹ˆ๋‹ค. ์ž‘์—… ์Šค์ผ€์ค„๋ง ๋ฐฉ์‹์€ FCFS๋กœ, ์ž‘์—…์ด ๋„์ฐฉํ•œ ์ˆœ์„œ๋Œ€๋กœ ์ฒ˜๋ฆฌ๋ฉ๋‹ˆ๋‹ค. 2. ์ƒํƒœ

Networking Network Computer Science
Maximizing the Cohesion is NP-hard

Maximizing the Cohesion is NP-hard

๋ณธ ๋…ผ๋ฌธ์˜ ์ฃผ์š” ๋ชฉํ‘œ๋Š” ์‚ฌํšŒ ๋„คํŠธ์›Œํฌ ๋ถ„์„์—์„œ ์ค‘์š”ํ•œ ์—ญํ• ์„ ํ•˜๋Š” '๊ฒฐ์†์„ฑ'์ด๋ผ๋Š” ์ƒˆ๋กœ์šด ์ง€ํ‘œ๋ฅผ ๋„์ž…ํ•˜๊ณ , ์ด ์ง€ํ‘œ๋ฅผ ์‚ฌ์šฉํ•˜์—ฌ ๊ทธ๋ž˜ํ”„ ๋‚ด์—์„œ ์ตœ๋Œ€ ๊ฒฐ์†์„ฑ์„ ๊ฐ–๋Š” ์ง‘ํ•ฉ์„ ์ฐพ๋Š” ๋ฌธ์ œ๊ฐ€ NP ํ•˜๋“œ์ž„์„ ์ฆ๋ช…ํ•˜๋Š” ๊ฒƒ์ด๋‹ค. ์ด๋ฅผ ํ†ตํ•ด ์‚ฌํšŒ ๋„คํŠธ์›Œํฌ ๋ถ„์„์˜ ๋ณต์žก์„ฑ์„ ์ดํ•ดํ•˜๊ณ , ํšจ์œจ์ ์ธ ์•Œ๊ณ ๋ฆฌ์ฆ˜ ๊ฐœ๋ฐœ์— ๋Œ€ํ•œ ํ•„์š”์„ฑ๊ณผ ํ•œ๊ณ„๋ฅผ ํŒŒ์•…ํ•  ์ˆ˜ ์žˆ๋‹ค. 1. ๊ฒฐ์†์„ฑ ์ง€ํ‘œ์˜ ๋„์ž… ๋ฐ ์‹คํ—˜์  ๊ฒ€์ฆ ๊ฒฐ์†์„ฑ์€ ์‚ฌํšŒ ๋„คํŠธ์›Œํฌ ๋‚ด์—์„œ ์ง‘๋‹จ์˜ ์ผ์ฒด๊ฐ์„ ์ธก์ •ํ•˜๋Š” ์ƒˆ๋กœ์šด ์ง€ํ‘œ๋กœ, ์ด๋Š” ์‚ฌ์šฉ์ž ์ฃผ๊ด€์  ์ปค๋ฎค๋‹ˆํ‹ฐ ์ธ์‹๊ณผ ๋†’์€ ์ƒ๊ด€๊ด€๊ณ„๋ฅผ ๊ฐ€์ง์„ ํŽ˜์ด์Šค๋ถ ์‹คํ—˜์„ ํ†ตํ•ด ํ™•์ธํ•˜์˜€๋‹ค. ์ด

Networking Computational Complexity Computer Science

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