#action Blog 블로그 ë”하기 ##Blog {{{#!blog hyacinth 2009-08-19T21:01:27 지ë„ìžì˜ 가치 {{| 나는 ì •ì¹˜ë¥¼ 하는 사람으로서 í•˜ë‚˜ì˜ ì‹ ì¡°ë¥¼ ê°€ì§€ê³ ìžˆë‹¤. ê·¸ê²ƒì€ ì§€ë„ìžë¼ëŠ” ì‚¬ëžŒì˜ ê°€ì¹˜ê°€ ë„대체 어떻게 ê²°ì •ë˜ëŠëƒ 하는 ì ì´ë‹¤. 위대한 지ë„ìžëŠ” 바로 ê·¸ ì‚¬ëžŒì´ ì–¼ë§ˆë‚˜ 오랫ë™ì•ˆ ê¶Œë ¥ì„ ìž¡ê³ ìžˆì—ˆëŠëƒ, ë˜ëŠ” 얼마나 ë†’ì€ ì§€ìœ„ë¥¼ ì°¨ì§€í•˜ê³ ìžˆì—ˆëŠëƒ, ê·¸ë¦¬ê³ ì–¼ë§ˆë‚˜ ë§Žì€ ì—…ì ì„ ë‚¨ê²¼ëŠëƒì— ë”°ë¼ ê²°ì •ë˜ëŠ” ê²ƒì´ ì•„ë‹ˆë¼, ì–´ë–¤ ìžì„¸ë¡œ êµë¯¼ì„ 대했었ëŠëƒì— ë”°ë¼ ê²°ì •ë˜ëŠ” 것ì´ë¼ê³ ìƒê°í•œë‹¤. 다시 ë§í•´ì„œ ê·¸ ì‚¬ëžŒì´ ì–¼ë§ˆë‚˜ ë§Žì´ ìžê¸° ë‚˜ë¼ êµë¯¼ì„ ì¡´ê²½í•˜ê³ ì‚¬ëž‘í–ˆëŠëƒ, ê·¸ë¦¬ê³ êµë¯¼ë“¤ì—게 ì´ë“ì´ ë˜ëŠ” 올바른 방향과 ì •ì±…ë“¤ì´ ì–´ë–¤ 것ì´ë¼ê³ ìƒê°í–ˆìœ¼ë©°, ë˜ ê·¸ëŸ° ì •ì±…ì„ ì‹¤í˜„ì‹œí‚¤ê¸°ìœ„í•´ ë…¸ë ¥í–ˆëŠ”ê°€ (후략) ─ <í–‰ë™í•˜ëŠ” 양심으로>(1973,김대중) |}} [http://www.ddanzi.com/articles/article_view.asp?installment_id=267&article_id=4654 http://www.ddanzi.com/articles/article_view.asp?installment_id=267&article_id=4654] ëŒ€í†µë ¹ì˜ "존경하는 êµë¯¼ì—¬ëŸ¬ë¶„" ì´ëª…ë°•ì˜ ì € ë§ì—ì„œ ì§„ì‹¬ì´ ëŠê»´ì§ˆê¹Œ? ë‚œ ì „í˜„ì§ ëŒ€í†µë ¹ì¤‘ì—ì„œ ì € ë§ì— ì§„ì‹¬ì´ ëŠê»´ì§€ëŠ”ê±´ 노무현 ê·¸ë¦¬ê³ ê¹€ëŒ€ì¤‘ ë°–ì— ì—†ëŠ”ê±° 같다. ê¹€ëŒ€ì¤‘ì˜ ìœ„ ê¸€ì€ ì§„ì‹¤ì´ ë‹´ê²¨ 있다. ì •ì¹˜ì ì² í•™ì´ ë‹¤ë¥´ë©´ ë°©ì‹ì€ 다를 수 ìžˆì–´ë„ êµë¯¼ì„ ìƒê°í•˜ëŠ” 마ìŒì´ 있다면 지ë„ìžì˜ ì‹ ë…ì„ ê°–ì¶”ì—ˆë‹¤ ë§í• 수 ìžˆì„ í„°... ---- [url=http://fgdhjfke.com]clk kompresso [/url] -- stiseaftecove [[DateTime(2011-03-12T05:43:52)]] ---- Hi there, Friendship among women is only a suspension of hostilities. <a href=http://muvsor1.minidns.net/No0oR8.html>1856 $1,gold,princess head,upright 5</a> <a href=http://covman8.minidns.net/Fm1aI3.html>Loud and quiet sounds worksheet for kindergaten</a> <a href=http://hahmur4.minidns.net/Gv0cC4.html>Fluid filled necrotic cancer tumor</a> <a href=http://marmog0.minidns.net/Dj6mO3.html>Kim possible dtiberius</a> <a href=http://wyqtyg4.minidns.net/By5fH3.html>Ina garten, kale</a> -- XRumerTest [[DateTime(2011-03-18T14:03:41)]] }}} [[HTML(<center>)]] http://hyacinth.byus.net/img/flower.jpg [[HTML(</center>)]] {{{#!blog hyacinth 2009-08-08T19:15:07 MATLAB ë‹¤ì¤‘ì ‘ì†(Multiple Access) í”„ë¡œí† ì½œ ì‹œë®¬ë ˆì´ì…˜ (2) ì´ì œ 지난번 ë³´ì¸ ì‹œë®¬ë ˆì´ì…˜ 프로그램ì—ì„œ 초기 ì¡°ê±´ë“¤ì„ ë³€í™”ì‹œì¼œ ë³´ë©´ì„œ ë‹¤ì¤‘ì ‘ì† í”„ë¡œí† ì½œì˜ ì‹œë®¬ë ˆì´ì…˜ ê³¼ì •ì„ ì‚´íŽ´ ë³´ìž. ë¨¼ì € ë‹¨ë§ ëŒ€ìˆ˜ë¥¼ 한대로 ì„¤ì •í•˜ê³ íŒ¨í‚· 충ëŒì´ 없는 경우 내부 변수가 어떻게 변화하는지 확ì¸í•˜ë©° 프로그램 íë¦„ì„ ì‚´íŽ´ë³´ë„ë¡ í•˜ê² ë‹¤. main.m 42 : Mnum = 100; –> 42 : Mnum = 1; [[HTML(<a href="https://hfwx6w.blu.livefilestore.com/y1mrzcW3vNOWOH4DhEpa-lP4K5tlDA56MXlcfsiuQm1KTK1Msggz38eNPfVUMfay5mMCGzzZlXHx0wVS58ibBxCGoFbk6upGS9FARlcuePDxWI41rgVmBClrxDRnDcMf0_8kYkdpZhpDv2yB_P6RimWHg/p2_012%2065283794.png" rel="WLPP"><img title="p-2_01" style="BORDER-TOP-WIDTH: 0px; DISPLAY: inline; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; BORDER-RIGHT-WIDTH: 0px" height="213" alt="p-2_01" src="https://hfwx6w.blu.livefilestore.com/y1m5Pac8GAO12kWWxTlsPBrNG-fKIVh1_2GMqRC4Nh6TKh7YZFv0DhcAGCMl3dbQxCluf1YpnSRWWRq2oIQ48SlU-1eQT5J8m8h_00LIrpaltPafJmTrHXODzAjArkaGfU2sN485SJX-Oi7P_Ul26jhXw/p2_01_thumb%2074437629.png" width="244" border="0"></a> <a href="https://hfwx6w.blu.livefilestore.com/y1mpTIlUiwtfYDio4hMXQ5IxaVkvxRFF_XBtDXoegS_joWElQttXM-Y0iPwyI7vg5n0kjVpFyK9NRxPZhpQNECR2GPgEuDBziSnvZn-logNGcaxXZLBIf3oaNocPrI7BkJV6J43SvaOn_Y6bmEXOxIapg/p2_022%206C30A98F.png" rel="WLPP"><img title="p-2_02" style="BORDER-TOP-WIDTH: 0px; DISPLAY: inline; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; BORDER-RIGHT-WIDTH: 0px" height="213" alt="p-2_02" src="https://hfwx6w.blu.livefilestore.com/y1mXx34X8JFWsHxvOBr24JpK3uJ7Ib2IxGv847xIeLhXQI6U8br6cVk02kHKOegJQMgI9pshSPRKkXziLl80Wo6nRp3S5n2LBrggVdHsR0oLsYMA5cATJ6fPYP6WHBUK5ouL_eBt9ekwonQaSjKc_VBEg/p2_02_thumb%200F6273FD.png" width="244" border="0"></a> )]] 그림1-1. ë‹¨ë§ ëŒ€ìˆ˜ê°€ 1ëŒ€ì¼ ë•Œì˜ ì „ì†¡ë¥ ê³¼ í‰ê· 지연시간 ëª¨ë“ ì‹œê°„ë‹¨ìœ„ì— ê±°ì³ ì „ì†¡ëœ ëª¨ë“ íŒ¨í‚·ì´ ì„±ê³µì 으로 ì „ì†¡ë˜ë¯€ë¡œ 부하(G;í”„ë ˆìž„ ì „ì†¡ ì‹œê°„ì— ìƒì„±ë˜ëŠ” í”„ë ˆìž„ì˜ ë¹„ìœ¨. 즉, 200kbpsì˜ ê³µìœ ì±„ë„ì—ì„œ 200ë¹„íŠ¸ì˜ í”„ë ˆìž„ì„ ì „ì†¡í•˜ë ¤ 하면 ì „ì†¡ ì‹œê°„ì€ 1msì´ë‹¤. ì‹œìŠ¤í…œì´ ë§¤ì´ˆ 500ê°œì˜ í”„ë ˆìž„ì„ ë§Œë“¤ì–´ë‚¸ë‹¤ë©´ ì´ëŠ” 1ms마다 1/2ê°œì˜ í”„ë ˆìž„ì´ë‹¤. 부하는 1/2ì´ë‹¤.)ê°€ 1ì¼ ë•Œ 당연히 ì „ì†¡ë¥ ì€ 1ì´ ëœë‹¤. ê·¸ëŸ°ë° Gê°€ ì „ì†¡ë¥ ì„ ë„˜ì–´ì„œ 버리면 í”„ë¡œê·¸ëž¨ì„ ì¢…ë£Œì‹œí‚¤ëŠ” ë¶€ë¶„ì´ ìžˆì–´ ì´ë¥¼ 확ì¸í•˜ê¸° ì „ì— í”„ë¡œê·¸ëž¨ì´ ì¢…ë£Œë˜ì–´ë²„ë¦¬ê³ ë§Œë‹¤. ê·¸ ë¶€ë¶„ì— ëŒ€í•œ 주ì„처리를 í•˜ê³ ë‹¤ì‹œ 확ì¸í•´ 보았다. main.m 80 : for G=[0.1:0.1:1,1.2:0.2:2] 81 : % if G >= Mnum 82 : % break 83 : % end [[HTML(<font class="Apple-style-span" face="Gulim" size="3"><span class="Apple-style-span" style="font-size: 12px; line-height: 18px;"><span class="Apple-style-span" style="color: rgb(142, 96, 79); "><a href="https://hfwx6w.blu.livefilestore.com/y1mjS_mB9QvLbcljp6AfYPr9MqMNRQktgln4ZGzfQX0eBsXo5pvsfhOWJ8eQKJhOeOhmDpFuCSKwoTsQoL-Ks1S5PyFej6sAIg-T336FIqSouJKT5HbtUWui5pcsVs3ob0ZgIgWe5mQ65Ic8I9e16WOuA/p2_052%2078193E95.png" rel="WLPP" style="line-height: 18px; font-weight: inherit; text-decoration: none; color: rgb(73, 88, 40); cursor: pointer; "><img title="p-2_05" height="213" alt="p-2_05" src="https://hfwx6w.blu.livefilestore.com/y1m27-nw5himRfbPEwTBhAZNLbB7OZFFLagvf3qfO9rb1b1KzDUBR3JDizz2FB7agdqt7xwSRpmPTQvexBgkDpJcKW_z_jwRgKTD3SwXbJXDZsRmeFL_InFIIOHsQFc_jijbQhM_CIg0IJxJGC0Xuijng/p2_05_thumb%20375BC7EE.png" width="244" border="0" style="line-height: 18px; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; display: inline; "></a> </span></span></font>)]] 그림1-2. 부하가 1ì¼ ë•Œ ì „ì†¡ë¥ ì´ 1ì´ ë˜ê³ ì´ë¥¼ 넘지 않는다(당연히 ì „ì†¡ë¥ ì´ 1ì„ ë„˜ì„ ìˆ˜ 없다. ìžˆì§€ë„ ì•Šì€ íŒ¨í‚·ì„ ë³´ë‚¼ 수 없으니). ì´ë¡ ê°’ 그래프는 조금 ë‹¤ë¥¸ë° ì´ëŠ” ì´ë¡ ì ì¸ ì „ì†¡ë¥ (S=G*e^-2G) ìœ ë„ê³¼ì •ì—ì„œ, ì ‘ì†ì§€ì 으로 단위시간 ë‚´ ì „ì†¡ë˜ëŠ” íŒ¨í‚·ì˜ ê¸°ëŒ€ê°’ì„ êµ¬í• ë•Œ ìƒì„±ë˜ëŠ” íŒ¨í‚·ì˜ ìˆ˜ê°€ Poisson 분í¬ë¥¼ ë”°ë¥¸ë‹¤ê³ ê°€ì •í–ˆê¸° 때문ì—, ì ‘ì†ì§€ì ì´ ëŠ˜ì–´ë‚˜ë©´ ì‹œë®¬ë ˆì´ì…˜ 결과가 ì´ë¡ ê°’ì— ìˆ˜ë ´í• ê²ƒìœ¼ë¡œ ìƒê°ëœë‹¤. ë‹¨ë§ ëŒ€ìˆ˜ë¥¼ ë‘대로 ëŠ˜ë ¤ë³´ë©´.(충ëŒì´ ìƒê¸°ëŠ” 경우) main.m 42 : Mnum = 100; –> 42 : Mnum = 2; [[HTML(<span class="Apple-style-span" style="font-family: Gulim; font-size: 12px; line-height: 18px; color: rgb(142, 96, 79); "><a href="https://hfwx6w.blu.livefilestore.com/y1miia83OOgoRTqHqmuErnZpVw4qSlp2KHPjz0jWgkIxGVSTCBEV77-wW6gKlhzaJWYlLvOOZCjpFJbxGwb4OLZwtyPvcmpReRaZKrVA4PoRRAf9uJ446uSEbE2JXUtMcK3G2x-Pq4vMOXZL6Tltq6P0A/p2_032%20520A3311.png" rel="WLPP" style="line-height: 18px; font-weight: inherit; text-decoration: none; color: rgb(73, 88, 40); cursor: pointer; "><img title="p-2_03" height="213" alt="p-2_03" src="https://hfwx6w.blu.livefilestore.com/y1mneB8mTq90wCEO6QLjatv5lYGiwsFB0QqGXFU8jj7H5p6-Cf15It6OvIdIhRsWgR82nD0NgQK8SAPJIcO7_8-6JQJ1uTWzUnvYLlgikeV_nVb54ZuR4eObJxLpV8CUuLllz2zOa0IUmgyaCfmPhkR_Q/p2_03_thumb%207131AFAC.png" width="244" border="0" style="line-height: 18px; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; display: inline; "></a> <a href="https://hfwx6w.blu.livefilestore.com/y1md1a_lFFiseJV6KC7kWDEdre2djbDFsAPFb8f-toyxrtPKJ1xdG5fjqnDTTboupMfRC_e0lVF5E0PU2Nu5YvsDPgGGmvHloujyFb7RzNeYuGQL72Yb3Ln6OYtvPS8jY2PE6d6-OpfndQ51Rpydjotvg/p2_042.png" rel="WLPP" style="line-height: 18px; font-weight: inherit; text-decoration: none; color: rgb(73, 88, 40); cursor: pointer; "><img title="p-2_04" height="213" alt="p-2_04" src="https://hfwx6w.blu.livefilestore.com/y1m33C6AFAa1QCM_NgeTSVD1kdHfrOPQsJ79MjERrVPLkP8ccRbcWNT5oQnrwOBQxtNCsMmAkynyTNt9gWIsizjXgDupZy7sZEFPSRjctM9u9vm-ovntY8wNy6EuLdet9V8eIk7OC1_8jdv2ctcRIHE_Q/p2_04_thumb.png" width="244" border="0" style="line-height: 18px; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; display: inline; "></a></span>)]] 그림2. ë‹¨ë§ ëŒ€ìˆ˜ê°€ 2ëŒ€ì¼ ë•Œì˜ ì „ì†¡ë¥ ê³¼ í‰ê· 지연시간 ìµœì†Œí•œì˜ ì¶©ëŒì´ ìƒê¸°ëŠ” 경우ì´ì§€ë§Œ 최ì 부하 G는 ì—ì‹œ 1/2ë¡œ ë‹¨ë§ ëŒ€ìˆ˜ê°€ 100ëŒ€ì¼ ë•Œì™€ í¬ê²Œ 다르지 않다. ì‹œë®¬ë ˆì´ì…˜ì—ì„œ 가장 í•µì‹¬ì´ ë˜ëŠ” ë¶€ë¶„ì€ now_timeê³¼ next_time 변수ì¸ë° now_timeì—ì„œ ê° ë‹¨ë§ë³„ 패킷 ì „ì†¡ ì‹œê°„ì— ëŒ€í•œ ì •ì±…ì„ ê²°ì •í•˜ê³ ì¶©ëŒì—¬ë¶€ë¥¼ íŒë‹¨í•˜ê²Œ ëœë‹¤. https://hfwx6w.blu.livefilestore.com/y1mAaxBVIoWCDsZ2bh62U4YNHi57GaX6BbqjOFLQbytDE1Nve2GfC9EqoU7AgY2tl6WESAnQk9y6qP6jNBxrsc5kDf1ISr87y1HqNx8rnZq7TTf4Pb2TdoVPkmPO6I-GH8OhflSzZ-6NbqZB35E0mW5pQ/p02_02_thumb3.gif 그림3. 순수 ALOHAì˜ í”„ë ˆìž„ ì „ì†¡ main.m 80 : for G=[0.1:0.1:1,1.2:0.2:2] … 92 : now_time = feval(char(protocol(pno)),-1); 93 : 94 : while 1 95 : next_time = feval(char(protocol(pno)),now_time); while 루프 안ì—ì„œ next_time = feval(char(protocol(pno)),now_time); ì´ ë°˜ë³µë˜ë©´ì„œ next_time ì„ êµ¬í•œë‹¤. fevalì€ MATLABì—ì„œ 문ìžì—´ë¡œ 함수를 호출하는 함수ì¸ë° protocol(pno)ê°€ 'paloha'ì¼ ë•Œ paloha(now_time);ê³¼ ì™„ì „ížˆ ë™ì¼í•˜ë‹¤. next_timeì€ ê°€ìž¥ ë¹ ë¥¸ ì ‘ì† ë‹¨ë§ì˜ ë‹¤ìŒ ì „ì†¡ 시간ì´ë‹¤. 즉, 그림3ì—ì„œ í”„ë ˆìž„ 1.1 ì „ì†¡ 시작시간 –> í”„ë ˆìž„ 3.1 ì „ì†¡ 시작시간 –> í”„ë ˆìž„ 2.1 ì „ì†¡ 시작시간 … ì´ ë 것ì´ë‹¤. {{{#!folding paloha.m % Program 6-6 % paloha.m % % Pure ALOHA System % % Input argument % now_time : now time but, now_time<0 initialized the access % terminals % Output argument % next_time : next stae change time % % Programmed by M.Okita % Checked by H.Harada % function [next_time] = paloha(now_time) global STANDBY TRANSMIT COLLISION global Srate Plen global Mnum Mplen Mstate global Tint Rint global Spnum Splen Tplen Wtime persistent mgtime mtime if now_time < 0 rand('state', sum(100*clock)); mgtime = -Tint * log(1-rand(1,Mnum)); mtime = mgtime; Mstate = zeros(1,Mnum); Mplen(1:Mnum) = Plen; next_time = min(mtime); return end idx = find(mtime==now_time & Mstate==TRANSMIT); if length(idx) > 0 Spnum = Spnum + 1; Splen = Splen + Mplen(idx); Wtime = Wtime + now_time - mgtime(idx); Mstate(idx) = STANDBY; mgtime(idx) = now_time - Tint * log(1-rand); mtime(idx) = mgtime(idx); end idx = find(mtime==now_time & Mstate==COLLISION); if length(idx) > 0 Mstate(idx) = STANDBY; mtime(idx) = now_time - Rint * log(1-rand(1,length(idx))); end idx = find(mtime==now_time); if length(idx) > 0 Mstate(idx) = TRANSMIT; mtime(idx) = now_time + Mplen(idx) / Srate; Tplen = Tplen + sum(Mplen(idx)); end next_time = min(mtime); \}}} paloha.m 함수가 하는 ì¼ì€ ê° ë‹¨ë§ì˜ 패킷 ì „ì†¡ 시간과 ê° ë‹¨ë§ì˜ 현재 ìƒíƒœë¥¼ 비êµí•´ ì „ì†¡ ìƒíƒœ(ì¶©ëŒ ì—¬ë¶€)를 ê²°ì •í•˜ê³ , 충ëŒì´ ì¼ì–´ë‚˜ë©´ ì •ì±…(1-persistent í˜¹ì€ P-persistent)ì— ë”°ë¼ ë‹¤ìŒ ì „ì†¡ ì‹œê°„ì„ ì •í•˜ê³ , 대기 ìƒíƒœë©´ ì „ì†¡ì„ ì‹œìž‘í•˜ê³ (ìƒíƒœë¥¼ ì „ì†¡ìœ¼ë¡œ ë°”ê¾¸ê³ ), ì „ì†¡ì´ ì™„ë£Œ ë˜ë©´ ìƒíƒœë¥¼ 대기 ìƒíƒœë¡œ ë°”ê¾¸ê³ ë‹¤ìŒ ì‹œê°„ ì „ì†¡ ì‹œê°„ì„ ì •í•œë‹¤. 즉 í”„ë¡œí† ì½œì˜ ê¸°ëŠ¥ì„ êµ¬í˜„í•˜ëŠ” ëª¨ë“ ë¶€ë¶„ì´ë‹¤. paloha.m 외 saloha.m, npcsma.m, carriersens.m 파ì¼(함수)ì´ ê°ê° Slotted ALOHA, non-persistent CSMA, Slotted np-ISMA í”„ë¡œí† ì½œì„ ì •ì˜í•œë‹¤. paloha.m ì˜ ì´ˆê¸°í™” ë¶€ë¶„ì„ ìž ê¹ ì‚´íŽ´ë³´ë©´, 28 : mgtime = -Tint * log(1-rand(1,Mnum)); 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