{"id":7403,"date":"2007-01-13T18:48:00","date_gmt":"2007-01-13T18:48:00","guid":{"rendered":"http:\/\/melotopia.net\/b\/?p=7403"},"modified":"2007-01-13T18:48:00","modified_gmt":"2007-01-13T18:48:00","slug":"%eb%b9%9b%eb%b3%b4%eb%8b%a4-%eb%b9%a0%eb%a5%b8-%ec%86%8c%eb%a6%ac","status":"publish","type":"post","link":"http:\/\/melotopia.net\/b\/?p=7403","title":{"rendered":"\ube5b\ubcf4\ub2e4 \ube60\ub978 \uc18c\ub9ac?"},"content":{"rendered":"<div class=\"desc\">\n<a href=\"http:\/\/scitation.aip.org\/getabs\/servlet\/GetabsServlet?prog=normal&#038;id=APPLAB000090000001014102000001&#038;idtype=cvips&#038;gifs=Yes\" target=\"_blank\"><br \/>\n         \ub17c\ubb38 \ubcf4\uae30<br \/>\n        <\/a><br \/>\n<br \/>\n<a href=\"http:\/\/www.livescience.com\/technology\/070112_ftl_sound.html\" target=\"_blank\"><br \/>\n         \ub77c\uc774\ube0c \uc0ac\uc774\uc5b8\uc2a4 \uae30\uc0ac \ubcf4\uae30<br \/>\n        <\/a><br \/>\n<br \/>\n<a href=\"http:\/\/news.naver.com\/news\/read.php?mode=LSD&#038;office_id=001&#038;article_id=0001519685&#038;section_id=105&#038;menu_id=105\" target=\"_blank\"><br \/>\n         \uc5f0\ud569\ub274\uc2a4 \uae30\uc0ac \ubcf4\uae30<br \/>\n        <\/a><\/p>\n<p>        \ub2f9\uc2e0, \ubb54\uac00 \ub09a\uc600\ub2e4\ub294 \ub290\ub08c \ub4e4\uc9c0 \uc54a\uc558\ub294\uac00.<\/p>\n<p>        \uc544\ubb34\ud2bc \uacfc\ud559 \uad00\ub828 \uae30\uc0ac\ub294 \uc77c\ub2e8 \ub17c\ubb38\uc744 \ubd10\uc57c \ubb54 \uc598\uae30\ub97c \ud560 \uc218 \uc788\uc73c\ubbc0\ub85c \ub17c\ubb38\uc744 \ucc3e\uc544\ubd24\ub2e4. APL\ud648\ud398\uc774\uc9c0 \uac00\ubcf4\ub2c8 \uae08\ubc29 \ucc3e\uc744 \uc218 \uc788\uc5c8\ub2e4.<\/p>\n<p>        \uc77c\ub2e8 \ub124\uc774\ubc84 \uae30\uc0ac\uc758 \ub313\uae00\uc740&#8230;&#8221;\ub9d0\ub3c4 \uc548\ub3fc&#8221;\uac00 \uc8fc\ub958\uc778 \uac83 \uac19\uc740\ub370, \uc774\uc815\ub3c4\uc758 \uc218\uc900\uae09 \ub17c\ubb38\uc744 \uace0\ub4f1\ud559\uc0dd\uc774 \uc2e4\ud5d8\ud574\uc11c \uc37c\ub2e4\ub294 \uac74 \uc65c \uc544\ubb34\ub3c4 \uc8fc\ubaa9\uc744 \uc548\ud558\uc9c0? \uc6b0\ub9ac\ub098\ub77c\uc5d0\uc120 \ubbf8\uce5c \uace0\ub529\uc774 \uc544\ub2cc \ud55c \uc808\ub300\ub85c \uc774\uc815\ub3c4\uc758 \ub17c\ubb38\uc740 \uc548 \ub098\uc62c \uac83 \uac19\uc740\ub370 \ub9d0\uc774\ub2e4. \ub354 \ubd80\ub7ec\uc6b4\uac74 \ub9c8\uc9c0\ub9c9\uc5d0 &#8220;This work was supported by the NSF&#8221;\uc774\ub2e4. \uad6d\uac00 \uacfc\ud559 \uc7ac\ub2e8\uc758 \uc9c0\uc6d0\uae08\uc774\ub77c\ub2c8. \uc6b0\ub9ac\ub098\ub77c \uacfc\ud559\uc7ac\ub2e8\uc740 \ubb50\ud588\ub098 \uc2f6\ub2e4.<br \/>\n        <br \/>\n        \uc6b0\ub9ac\ub098\ub77c \uace0\ub4f1\ud559\uc0dd\ub4e4\uc774\ub77c\uace0 \uba38\ub9ac\uac00 \ub098\uc060 \uc774\uc720\uac00 \uc5c6\ub2e4. \uc9c0\uc6d0\ub9cc \ud574\uc900\ub2e4\uba74 \ub354 \uc88b\uc740 \ub17c\ubb38\ub3c4 \uc4f8 \uc218 \uc788\uace0, \ub354 \ub6f0\uc5b4\ub09c \uacb0\uacfc\ub97c \ub0bc \uc218 \uc788\ub2e4. \ub2e4\ub9cc \uadf8\uac78 \ud560 \uc218 \uc788\ub2e4\uace0 \uace0\ub4f1\ud559\uc0dd\uc5d0\uac8c \uc544\ubb34\ub3c4 \uac00\ub974\uccd0\uc8fc\uc9c0 \uc54a\uc744 \ubfd0\uc774\ub2e4.<br \/>\n        <br \/>\n        \ud574\ubcf4\ub77c\uace0 \uc2dc\ud0a4\uc9c0\ub3c4 \uc54a\uace0 \uc790\uae30\ub124\ub4e4\uc774 \ud560 \uc218 \uc788\ub294\uc9c0\ub3c4 \uc0dd\uac01 \ud574\ubcf8\uc801\ub3c4 \uc5c6\uace0 \uadf8\ub7f0 \uc0dd\uac01\uc744 \ud55c\ub2e4\uace0 \ud560 \uc218 \uc788\uac8c \ud5c8\ub77d\ud574\uc8fc\ub294 \uac83\ub3c4 \uc544\ub2c8\ub2e4. \uace0\ub4f1\ud559\uad50 \uacfc\ud559\uc2e4\uc758 \ucd5c\ucca8\ub2e8 \uc2e4\ud5d8 \uae30\uc790\uc7ac\ub294 \uba3c\uc9c0\ub9cc \uc313\uc5ec\uac04\ub2e4. \uc65c \uc0c0\ub0d0, \uadf8\uac74.<\/p>\n<p>        \ubcf8\ub860\uc73c\ub85c \ub3cc\uc544\uc640\uc11c, \ub17c\ubb38\uc758 \ub0b4\uc6a9\uc740 \ub2e4\uc74c\uacfc \uac19\ub2e4. \uc2e4\ud5d8\uc744 \ud588\ub294\ub370, \uae34 \ud30c\uc774\ud504 \uc911\uac04\uc5d0 \uc18c\ub9ac\uac00 \ub611\ubc14\ub85c \uac00\ub294 \uae38\uacfc \uc606\uc73c\ub85c \ub3cc\uc544\uc11c \uac00\ub294 \uae38\uc744 \ub9cc\ub4e4\uc5c8\ub2e4. \uc774\uac83\uc744 Loop filter\ub77c\uace0 \ubd80\ub978\ub2e4. \ud55c\ucabd\uc5d0\uc11c \uc2a4\ud53c\ucee4\ub85c \uc785\ub825\uc744 \ub123\uace0 \ubc18\ub300\ucabd\uc5d0\uc11c \ub9c8\uc774\ud06c\ub85c \ucd9c\ub825\uc744 \ubd99\uc7a1\uc544\uc11c \ucef4\ud4e8\ud130\ub85c \ubd84\uc11d\ud558\ub294 \uac70\ub2e4. \uadf8\ub7fc, \uacb0\uacfc\uac00 \uc65c \uc774\ub530\uc704\ub0d0\uace0? \uc0c1\ub300\uc131 \uc774\ub860\uc774 \ud2c0\ub9b0\uac70 \uc544\ub2c8\ub0d0\uace0? \uae00\uc384? \uc2e4\ud5d8 \uacb0\uacfc\uac00 \uadf8\ub807\ub2e4\ub294\ub370? \uc2e4\ud5d8 \uacb0\uacfc\ub3c4 \ub9de\uace0 \uc0c1\ub300\uc131 \uc774\ub860\ub3c4 \ub9de\ub2e4.<\/p>\n<p>        \uc790, \uc0dd\uac01\ud574 \ubcf4\uc790. \uc2dc\uac04-\uacf5\uac04 \uc601\uc5ed\uc5d0\uc11c, \uc74c\ud30c\uc5d0 \ub300\ud55c \ud568\uc218\ub97c \uc0dd\uac01\ud574 \ubcf4\uba74 \uc5b4\ub290 \ud55c \uc601\uc5ed\uc5d0 \ubab0\ub824\uc788\ub2e4. \uc774\uac83\uc744 wave packet\uc774\ub77c\uace0 \ubd80\ub978\ub2e4. \uc774\uac78 \uacf5\uac04 \uc601\uc5ed\uc5d0\uc11c \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc744 \ud574 \ubcf4\uba74, \uac01\uc885 \uc18d\ub825\uc5d0 \ud574\ub2f9\ud558\ub294 \uc74c\ud30c \uc131\ubd84\ub4e4\uc774 \ub2e4\uc591\ud558\uac8c \ubaa8\ub450 \uc788\ub2e4. \uc774\uac83\ub4e4\uc774 \uc804\ubd80 \ud569\uccd0\uc838\uc11c \ud558\ub098\uc758 wave packet\uc744 \uad6c\uc131\ud558\uac8c \ub41c\ub2e4. \ubb38\uc81c\ub294, filter\ub97c \ud1b5\uacfc\ud560 \ub54c \uc0dd\uae30\ub294 resonance\uc774\ub2e4. \ud2b9\uc774\ud558\uac8c \uc0dd\uae34 \ub8e8\ud504 \ud544\ud130 \ub355\ubd84\uc5d0, wave packet\uc758 \uc131\ubd84 \uc911\uc5d0\uc11c \uadf8\ub0e5 \uac00\ub358 \uc560\ub4e4 \ub9d0\uace0, \uc5c9\ub6b1\ud55c \uc560\ub4e4\uc774 \uacf5\uba85\uc744 \uc77c\uc73c\ucf1c\uc11c \uc99d\ud3ed\uc774 \ub41c \uac70\ub2e4. \uc774\ub807\uac8c \ub418\uba74 \uc7ac\uad6c\uc131\ub41c wave packet\uc758 \uc0dd\uae40\uc0c8\uac00 \ubcc0\ud558\uac8c \ub418\ub294\ub370, \uc774\ub54c \ub9d0\ud558\ub294 &#8220;\ubcc0\ud654&#8221;\ub77c\ub294 \uac83\uc740 \uacf5\uac04\uc801\uc73c\ub85c \uc5ec\uae30\uc5d0 \uc788\ub358 \uac83\uc774 \uc800\uae30\uae4c\uc9c0 \uac00\ubc84\ub9b4 \uc218 \uc788\ub294, \uc21c\uc2dd\uac04\uc5d0 \uac00\ubc84\ub9b4 \uc218 \uc788\ub294 \uac83\uc744 \ub73b\ud55c\ub2e4. \ubb3c\ub860 \ubb3c\ub9ac\uc801\uc73c\ub85c \uc74c\ud30c\ub97c \uad6c\uc131\ud558\ub294 \uc5b4\ub5a4 \uacf5\uae30 \ubd84\uc790\ub3c4 \ube5b\uc758 \uc18d\ub825\ubcf4\ub2e4 \ube60\ub974\uac8c \uc6c0\uc9c1\uc774\uc9c0 \uc54a\uc558\uc73c\ubbc0\ub85c \uc0c1\ub300\uc131 \uc774\ub860\uc5d0 \ubb38\uc81c\ub294 \uc5c6\ub2e4. \uadf8\ub9ac\uace0 \uc74c\uc758 \uad70 \uc18d\ub825\uc774 \ub098\ud0c0\ub09c\ub2e4\uace0 \ud574\ub3c4 \uc774\uac74 loop filter\uac00 \uc788\ub294 \uad6c\uac04\uc5d0\uc11c\ub9cc \uc77c\uc5b4\ub098\ub294 \uc77c\uc774\uace0, \uaf64 \ud2b9\uc218\ud55c \uc870\uac74\uc5d0\uc11c\ub9cc \ub098\ud0c0\ub098\ub294 \uc77c\uc774\uae30 \ub54c\ubb38\uc5d0 \uadf8\ub2e4\uc9c0 \uc2e4\uc6a9\uc801\uc73c\ub85c \uc4f0\uc77c \uac83 \uac19\uc9c0\ub294 \uc54a\ub2e4.<\/p>\n<div style=\"width:100%;margin-top:30px;clear:both;height:30px\">\n<div style=\"width:31px;float:left;\">\n<a href=\"\/toolbar\/popup\/abuseReport\/?entryId=180\" onclick=\"window.open(this.href, 'tistoryThisBlogPopup', 'width=550, height=510, toolbar=no, menubar=no, status=no, scrollbars=no'); return false;\"><br \/>\n<img data-recalc-dims=\"1\" decoding=\"async\" alt=\"\uc2e0\uace0\" src=\"https:\/\/i0.wp.com\/t1.daumcdn.net\/tistory_admin\/static\/ico\/ico_spam_report.png\" style=\"border:0\"\/><br \/>\n<\/a>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\ub17c\ubb38 \ubcf4\uae30 \ub77c\uc774\ube0c \uc0ac\uc774\uc5b8\uc2a4 \uae30\uc0ac \ubcf4\uae30 \uc5f0\ud569\ub274\uc2a4 \uae30\uc0ac \ubcf4\uae30 \ub2f9\uc2e0, \ubb54\uac00 \ub09a\uc600\ub2e4\ub294 \ub290\ub08c \ub4e4\uc9c0 \uc54a\uc558\ub294\uac00. \uc544\ubb34\ud2bc \uacfc\ud559 \uad00\ub828 \uae30\uc0ac\ub294 \uc77c\ub2e8 \ub17c\ubb38\uc744 \ubd10\uc57c \ubb54 \uc598\uae30\ub97c \ud560 \uc218 \uc788\uc73c\ubbc0\ub85c \ub17c\ubb38\uc744 \ucc3e\uc544\ubd24\ub2e4. APL\ud648\ud398\uc774\uc9c0 \uac00\ubcf4\ub2c8 \uae08\ubc29 \ucc3e\uc744 \uc218 \uc788\uc5c8\ub2e4. \uc77c\ub2e8 \ub124\uc774\ubc84 \uae30\uc0ac\uc758 \ub313\uae00\uc740&#8230;&#8221;\ub9d0\ub3c4 \uc548\ub3fc&#8221;\uac00 \uc8fc\ub958\uc778 \uac83 \uac19\uc740\ub370, \uc774\uc815\ub3c4\uc758 \uc218\uc900\uae09 \ub17c\ubb38\uc744 \uace0\ub4f1\ud559\uc0dd\uc774 \uc2e4\ud5d8\ud574\uc11c \uc37c\ub2e4\ub294 \uac74 \uc65c \uc544\ubb34\ub3c4 \uc8fc\ubaa9\uc744 \uc548\ud558\uc9c0? \uc6b0\ub9ac\ub098\ub77c\uc5d0\uc120 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[2],"tags":[],"class_list":["post-7403","post","type-post","status-publish","format-standard","hentry","category-academic"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p8o6gA-1Vp","jetpack-related-posts":[],"jetpack_likes_enabled":true,"_links":{"self":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/posts\/7403","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=7403"}],"version-history":[{"count":0,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/posts\/7403\/revisions"}],"wp:attachment":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7403"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7403"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7403"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}