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author Nozomi Teruya <e125769@ie.u-ryukyu.ac.jp>
date Thu, 18 Feb 2016 09:06:13 +0900
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1 <!DOCTYPE html>
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2 <html>
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3 <head>
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4 <meta http-equiv="content-type" content="text/html;charset=utf-8">
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5 <title>分散フレームワークAliceのMeta Data Segment</title>
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7 <meta name="generator" content="Slide Show (S9) v2.5.0 on Ruby 2.1.0 (2013-12-25) [x86_64-darwin13.0]">
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8 <meta name="author" content="照屋のぞみ" >
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11 <link rel="stylesheet" href="s6/themes/projection.css" media="screen,projection">
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12 <link rel="stylesheet" href="s6/themes/screen.css" media="screen">
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18 <script src="s6/js/jquery.slideshow.js"></script>
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20 <script src="s6/js/jquery.slideshow.controls.js"></script>
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21 <script src="s6/js/jquery.slideshow.footer.js"></script>
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24 <!-- prettify -->
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25 <link rel="stylesheet" href="scripts/prettify.css">
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28 <script>
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29 $(document).ready( function() {
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37 });
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38 prettyPrint();
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39 } );
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42 </script>
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44 <!-- Better Browser Banner for Microsoft Internet Explorer (IE) -->
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46 <script src="s6/js/jquery.microsoft.js"></script>
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51 </head>
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54 <div class="layout">
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55 <div id="header"></div>
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57 <div align="right">
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58 <img src="s6/images/logo.svg" width="200px">
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59 </div>
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60 </div>
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61 </div>
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63 <div class="presentation">
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65 <div class='slide cover'>
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66 <table width="90%" height="90%" border="0" align="center">
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67 <tr>
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68 <td>
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69 <div align="center">
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70 <h1><font color="#808db5">分散フレームワークAliceのMeta Data Segment</font></h1>
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71 </div>
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72 </td>
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73 </tr>
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74 <tr>
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75 <td>
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76 <div align="left">
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77 照屋のぞみ
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78 琉球大学 工学部 情報工学科 河野研
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79 <hr style="color:#ffcc00;background-color:#ffcc00;text-align:left;border:none;width:100%;height:0.2em;">
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80 </div>
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81 </td>
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82 </tr>
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83 </table>
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84 </div>
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86 <div class='slide '>
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87 <!-- === begin markdown block ===
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88
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89 generated by markdown/1.2.0 on Ruby 2.1.0 (2013-12-25) [x86_64-darwin13.0]
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90 on 2016-02-18 09:05:23 +0900 with Markdown engine kramdown (1.5.0)
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91 using options {}
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92 -->
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94 <!-- _S9SLIDE_ -->
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95 <h1 id="section">研究目的(1/3)</h1>
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96 <ul>
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97 <li>当研究室が開発している並列分散フレームワークAliceではスケーラブルな分散プログラムを信頼性高く記述できる環境を実現する</li>
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98 <li>ここで言う信頼性とは定められた環境下で安定して仕様に従った動作を行うことを指す</li>
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99 <li>Aliceでは当研究室が提案しているデータを Data Segment、タスクを Code Segment という単位で分割して記述するプログラミング手法を採用している</li>
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100 </ul>
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101
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102
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103 </div>
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104 <div class='slide '>
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105 <!-- _S9SLIDE_ -->
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106 <h1 id="section-1">研究目的(2/3)</h1>
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107 <ul>
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108 <li>Aliceでは、ComputationとMetaComputationに階層化し、コアな仕様と複雑な例外処理に分離する。</li>
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109 <li>分散環境構築などの複雑な処理はAliceがMeta Computationとして提供する</li>
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110 <li>コードの変更を抑え、変更前の信頼性を保ったまま拡張可能にする</li>
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111 </ul>
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113
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114 </div>
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115 <div class='slide '>
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116 <!-- _S9SLIDE_ -->
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117 <h1 id="section-2">研究目的(3/3)</h1>
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118 <ul>
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119 <li>本研究では、Alice上に実用的な分散アプリケーションが制作できることを示すために画面配信システムTreeVNCを構築する</li>
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120 <li>構築するにあたり必要となった圧縮機能をAliceのMeta Computationとして実装した</li>
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121 <li>もとのTreeVNCとの比較を行うことでMeta Computationの役割と有効性を示す</li>
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122 </ul>
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125 </div>
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126 <div class='slide '>
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127 <!-- _S9SLIDE_ -->
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128 <h1 id="data-segment--code-segment">Data Segment と Code Segment</h1>
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129 <ul>
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130 <li>Aliceではデータを <strong>Data Segment(DS)</strong> 、タスクを <strong>Code Segment(CS)</strong> という単位に分割して依存関係を記述することでプログラミングを行う。</li>
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131 <li>CSはInput DS(入力されるDS)とOutput DS(出力されるDS)を持つ。</li>
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132 <li>CSはkeyで指定されたDSが全て揃うと実行されるという性質を持つ。
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133 <img src="./images/dsandcs.svg" alt="opt" width="50%" /></li>
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134 </ul>
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135
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136
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137 </div>
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138 <div class='slide '>
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139 <!-- _S9SLIDE_ -->
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140 <h1 id="codesegment">CodeSegmentの依存関係</h1>
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141 <ul>
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142 <li>データの依存関係にないCSは並列実行される</li>
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143 <li>データの依存関係がある場合は Input DS が揃うと順に実行される</li>
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144 <li>DSはCSに専有されるためロックの記述を必要としない
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145 <img src="./images/dsandcs2.svg" alt="opt" width="60%" /></li>
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146 </ul>
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147
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148
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149 </div>
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150 <div class='slide '>
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151 <!-- _S9SLIDE_ -->
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152 <h1 id="data-segment-manager">Data Segment Manager</h1>
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153 <ul>
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154 <li>DS の集合体であるデータベースを <strong>DS Manager(DSM)</strong> と呼ぶ。<br />
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155 <ul>
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156 <li>Local DSM … 各ノード固有のデータベース。</li>
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157 <li>Remote DSM … 他のノードの Local DSM の proxy。接続しているノードの数だけ存在する。 </li>
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158 </ul>
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159 </li>
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160 <li>DSM 内の DS には対になる String型のkey が存在し、 DSM 名と key を指定しすることで DS の保存、取得を行う。
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161 <img src="./images/remote_datasegment.svg" alt="opt" width="50%" /></li>
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162 </ul>
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163
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164
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165 </div>
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166 <div class='slide '>
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167 <!-- _S9SLIDE_ -->
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168 <h1 id="computation--meta-computation">Computation と Meta Computation</h1>
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169 <ul>
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170 <li>Aliceでは、計算の本質的な処理をComputatin、Computationとは直接関係ないが別のレベルでそれを支える処理をMeta Computationとして分けて考える。</li>
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171 <li>分散トポロジーの構成、通信の切断・再接続時の処理などはMeta ComputationとしてAliceが提供</li>
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172 <li>プログラマは目的の処理だけ記述し通信部分などはMeta Computationを指定することでシンプルな記述を実現</li>
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173 </ul>
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174
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175
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176 </div>
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177 <div class='slide '>
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178 <!-- _S9SLIDE_ -->
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179 <h1 id="computation--meta-computation-1">Computation と Meta Computation</h1>
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180 <ul>
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181 <li>DS/CSの接続の間にMeta Computationが実行されている</li>
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182 <li>AliceのMeta ComputationもCS/DSにより実現される</li>
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183 <li>Meta ComputationはCS の処理を支えるMeta CSとMeta CSに管理されるMeta DSに分けられる
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184 <img src="./pictures/MetaCSDS.svg" alt="opt" width="70%" /></li>
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185 </ul>
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186
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187
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188 </div>
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189 <div class='slide '>
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190 <!-- _S9SLIDE_ -->
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191 <h1 id="treevnc">TreeVNCへの応用</h1>
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192 <ul>
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193 <li>AliceのMeta Computationの有効性を示すため実用的な例題であるTreeVNCを実装する</li>
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194 <li>TightVNCをもとにした木構造画面配信システム</li>
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195 <li>画面処理や分散処理が混在する複雑なTreeVNCも、Aliceを用いればTightVNCからの変更が少ない見通しの良い記述で構成可能</li>
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196 </ul>
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197
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198
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199 </div>
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200 <div class='slide '>
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201 <!-- _S9SLIDE_ -->
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202 <h1 id="treevnc-1">TreeVNCで必要な機能</h1>
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203 <p>TreeVNCのComputation（VNCサーバからデータを受け取り表示）を支える機能をMeta Computationとして実装する </p>
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204
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205 <ul>
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206 <li>TreeTopologyの構成・管理（Topology Manager）</li>
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207 <li>ノード間通信の切断時・再接続時の処理（ClosedEventManager）</li>
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208 <li>ノードの接続状態確認（KeepAlive）</li>
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209 <li>子ノードへのデータの転送(flip)</li>
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210 <li>データの圧縮</li>
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211 </ul>
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212
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213
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214 </div>
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215 <div class='slide '>
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216 <!-- _S9SLIDE_ -->
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217 <h1 id="meta-computation">Meta Computationの追加</h1>
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218 <ul>
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219 <li>TreeVNCの数MByteの画面差分データを配信し続けるためデータを圧縮している</li>
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220 <li>画面データを圧縮して送る → 解凍して画面表示 → 再圧縮して子ノードへ転送</li>
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221 <li>圧縮状態のまま子ノードに送信ができれば、解凍・再圧縮 するオーバーヘッドを無くすことができる</li>
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222 <li>圧縮のMeta Computationと転送のMeta Computationを追加した</li>
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223 </ul>
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224
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225
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226 </div>
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227 <div class='slide '>
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228 <!-- _S9SLIDE_ -->
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229 <h1 id="meta-ds">圧縮表現(Meta DS)の追加</h1>
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230 <ul>
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231 <li>DSを複数作るのではなく、１つのDSに対しMeta DSとして以下の表現を同時に持たせる</li>
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232 </ul>
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233
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234 <table style="border:none;">
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235 <tr><td width="550px">
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236 1. 一般的なJavaのオブジェクト<br />
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237 　LocalDSMにputしたときの形式 <br />
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238 <br />
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239 2. シリアライズ化されたバイナリオブジェクト <br />
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240 　RemoteDSMにputしたときの形式 <br />
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241 <br />
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242 3. 2を圧縮したバイナリオブジェクト <br />
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243 　今回追加した形式 <br />
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244 </td>
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245 <td width="500px">
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246 <img src="./pictures/compressDS.svg" width="100%" />
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247 </td>
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248 </tr>
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249 </table>
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250
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251
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252 </div>
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253 <div class='slide '>
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254 <!-- _S9SLIDE_ -->
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255 <h1 id="dsmapi">圧縮表現を扱うDSMとAPIの追加</h1>
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256 <ul lang="java">
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257 <li>Local と Remote それぞれに圧縮表現を扱う Compressed DSM を追加</li>
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258 <li>DSを圧縮したい場合は指定する DSM を Compressed DSM に変える</li>
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259 <li>圧縮するコードとしないコードで変更が少ない </li>
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260 </ul>
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261 <pre><code> put("Remote", "Key", val);
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262 put("compressedRemote", "Key", val); 　
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263 </code></pre>
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264
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265
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266 </div>
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267 <div class='slide '>
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268 <!-- _S9SLIDE_ -->
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269 <h1 id="section-3">圧縮表現がオンデマンドに作られる</h1>
6
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270 <ul>
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271 <li>DS はオブジェクト表現と圧縮表現を同時にもつため、TreeVNCでは受け取った画面データを解凍した後、転送のためにコピーや再圧縮をすることはない。</li>
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272 <li>複数表現は必要最低限にしか作られない。</li>
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273 <li>一つのKeyに対し様々な表現のDSが対応するが、キャストメソッドであるasClass()によってユーザーは送られてくるDSの表現を気にせず任意の型で取り出せる。 </li>
6
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274 </ul>
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275
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276
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277 </div>
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278 <div class='slide '>
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279 <!-- _S9SLIDE_ -->
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280 <h1 id="meta-computation-1">Meta Computationの評価</h1>
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281 <p>TreeVNCとAliceVNCを比較した </p>
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282
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283 <ul>
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284 <li>性能比較<br />
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285 各ノードへのメッセージの伝達速度を比較<br />
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Nozomi Teruya <e125769@ie.u-ryukyu.ac.jp>
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286 同等の性能が実現できたか </li>
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287 <li>コード比較<br />
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288 コード量・コード複雑度を比較<br />
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289 シンプルな記述で仕様の変更が抑えられているか </li>
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290 </ul>
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291
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292
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293 </div>
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294 <div class='slide '>
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295 <!-- _S9SLIDE_ -->
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296 <h1 id="section-4">性能比較 - 実験結果</h1>
6
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297 <ul>
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298 <li>3段目の計測結果</li>
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299 <li>同じ傾向から同等の処理性能があることがわかった </li>
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300 </ul>
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301
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302 <table style="border:none;">
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303 <tr>
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304 <td><img src="./pictures/TreeVNC_depth3.svg" width="80%" /></td>
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305 <td><img src="./pictures/AliceVNC_compress_depth3.svg" width="80%" /></td>
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306 </tr>
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Nozomi Teruya <e125769@ie.u-ryukyu.ac.jp>
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307 <tr>
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308 <td align="center">TreeVNC</td>
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309 <td align="center">AliceVNC</td>
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310 </tr>
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311 </table>
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312
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313
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314 </div>
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315 <div class='slide '>
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316 <!-- _S9SLIDE_ -->
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317 <h1 id="section-5">コード量比較</h1>
6
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318 <ul>
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319 <li>TightVNCを含む全体の行数・単語数はAliceVNCのほうが少ない</li>
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320 <li>コードの増加量ではTreeVNCに比べ75%仕様の変更が抑えられている </li>
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321 </ul>
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322
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323 <table style="border-collapse: collapse;border:1px solid #000000;">
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324 <th style="border:1px solid #000000;padding:5px 15px 5px 15px;"></th>
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325 <th style="border:1px solid #000000;padding:5px 15px 5px 15px;"> 行数 </th>
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326 <th style="border:1px solid #000000;padding:5px 15px 5px 15px;">単語数</th>
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327 <th style="border:1px solid #000000;padding:5px 15px 5px 15px;">TightVNCからの変更行数</th>
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328 <tr>
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329 <td style="border:1px solid #000000;padding:5px 15px 5px 15px;"> TreeVNC </td>
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330 <td style="border:1px solid #000000;padding:5px 15px 5px 15px;">19502</td>
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331 <td style="border:1px solid #000000;padding:5px 15px 5px 15px;">73646</td>
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332 <td style="border:1px solid #000000;padding:5px 15px 5px 15px;">7351</td>
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parents:
diff changeset
333 </tr>
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334 <tr>
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335 <td style="border:1px solid #000000;padding:5px 15px 5px 15px;"> AliceVNC </td>
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336 <td style="border:1px solid #000000;padding:5px 15px 5px 15px;">14647</td>
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337 <td style="border:1px solid #000000;padding:5px 15px 5px 15px;">59217</td>
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parents:
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338 <td style="border:1px solid #000000;padding:5px 15px 5px 15px;">1129</td>
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parents:
diff changeset
339 </tr>
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340 <tr>
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341 <td style="border:1px solid #000000;padding:5px 15px 5px 15px;"> 減少率 (%)</td>
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342 <td style="border:1px solid #000000;padding:5px 15px 5px 15px;">25</td>
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343 <td style="border:1px solid #000000;padding:5px 15px 5px 15px;">20</td>
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344 <td style="border:1px solid #000000;padding:5px 15px 5px 15px;">75</td>
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345 </tr>
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parents:
diff changeset
346 </table>
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347
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348
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diff changeset
349 </div>
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350 <div class='slide '>
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351 <!-- _S9SLIDE_ -->
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352 <h1 id="section-6">コード複雑度比較</h1>
6
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353 <ul>
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Nozomi Teruya <e125769@ie.u-ryukyu.ac.jp>
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354 <li>循環的複雑度を用いる<br />
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355 コード内の線形独立な経路の数。if や forが多いほど複雑度が高い。</li>
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Nozomi Teruya <e125769@ie.u-ryukyu.ac.jp>
parents:
diff changeset
356 </ul>
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Nozomi Teruya <e125769@ie.u-ryukyu.ac.jp>
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357
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358 <table style="border-collapse: collapse;border:1px solid #000000;">
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359 <th style="border:1px solid #000000;padding:5px 15px 5px 15px;"></th>
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360 <th style="border:1px solid #000000;padding:5px 15px 5px 15px;"> 平均値 </th>
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361 <th style="border:1px solid #000000;padding:5px 15px 5px 15px;">最高値</th>
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diff changeset
362 <tr>
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363 <td style="border:1px solid #000000;padding:5px 15px 5px 15px;"> TightVNC </td>
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Nozomi Teruya <e125769@ie.u-ryukyu.ac.jp>
parents:
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364 <td style="border:1px solid #000000;padding:5px 15px 5px 15px;">13.63</td>
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Nozomi Teruya <e125769@ie.u-ryukyu.ac.jp>
parents:
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365 <td style="border:1px solid #000000;padding:5px 15px 5px 15px;">97</td>
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Nozomi Teruya <e125769@ie.u-ryukyu.ac.jp>
parents:
diff changeset
366 </tr>
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Nozomi Teruya <e125769@ie.u-ryukyu.ac.jp>
parents:
diff changeset
367 <tr>
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368 <td style="border:1px solid #000000;padding:5px 15px 5px 15px;"> TreeVNC </td>
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369 <td style="border:1px solid #000000;padding:5px 15px 5px 15px;">15.33</td>
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parents:
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370 <td style="border:1px solid #000000;padding:5px 15px 5px 15px;">141</td>
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Nozomi Teruya <e125769@ie.u-ryukyu.ac.jp>
parents:
diff changeset
371 </tr>
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Nozomi Teruya <e125769@ie.u-ryukyu.ac.jp>
parents:
diff changeset
372 <tr>
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Nozomi Teruya <e125769@ie.u-ryukyu.ac.jp>
parents:
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373 <td style="border:1px solid #000000;padding:5px 15px 5px 15px;"> AliceVNC</td>
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Nozomi Teruya <e125769@ie.u-ryukyu.ac.jp>
parents:
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374 <td style="border:1px solid #000000;padding:5px 15px 5px 15px;">10.95</td>
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Nozomi Teruya <e125769@ie.u-ryukyu.ac.jp>
parents:
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375 <td style="border:1px solid #000000;padding:5px 15px 5px 15px;">99</td>
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Nozomi Teruya <e125769@ie.u-ryukyu.ac.jp>
parents:
diff changeset
376 </tr>
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Nozomi Teruya <e125769@ie.u-ryukyu.ac.jp>
parents:
diff changeset
377 </table>
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Nozomi Teruya <e125769@ie.u-ryukyu.ac.jp>
parents:
diff changeset
378
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Nozomi Teruya <e125769@ie.u-ryukyu.ac.jp>
parents:
diff changeset
379 <ul>
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Nozomi Teruya <e125769@ie.u-ryukyu.ac.jp>
parents:
diff changeset
380 <li>AliceVNCのほうがTreeVNCに比べ複雑度が低い</li>
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Nozomi Teruya <e125769@ie.u-ryukyu.ac.jp>
parents:
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381 <li>TreeVNC で最も複雑度が高いTreeRFBProto.classはデータの待ち合わせ処理や通信処理が入り組んだ複雑なコード</li>
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Nozomi Teruya <e125769@ie.u-ryukyu.ac.jp>
parents:
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382 <li>AliceVNCで最も複雑度が高いSwingViewerWindow.classは、TightVNCから変更がほとんどないため、AliceVNCの持っている複雑度はTightVNCが元来持っていた複雑度</li>
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Nozomi Teruya <e125769@ie.u-ryukyu.ac.jp>
parents:
diff changeset
383 </ul>
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384
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385
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386 </div>
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387 <div class='slide '>
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388 <!-- _S9SLIDE_ -->
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389 <h1 id="section-7">まとめ</h1>
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390 <ul>
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391 <li>Alice が実用的なアプリケーションを記述するための Meta Computation として、Meta Data Segmentに複数の表現のデータを同時に持たせることで圧縮機能を実装した。同様の手法を用いれば暗号表現などへの対応もでき自由度の高い通信を行うことが可能になる。</li>
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392 <li>TreeVNCをAlice上で実装し比較を行った結果、変更量の少ないシンプルな記述でTreeVNCの基本機能を実現でき、同等の性能を出すことに成功した。</li>
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393 <li>AliceのMeta Computationが拡張性・信頼性の高い実用的な分散アプリケーションの構築に有用であることが確認された。</li>
6
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394 </ul>
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395
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396
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397 </div>
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398 <div class='slide '>
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399 <!-- _S9SLIDE_ -->
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400 <h1 id="section-8">今後の課題</h1>
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401 <ul>
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402 <li>TreeVNCでは拡張が困難であった別ネットワーク間の通信もTopology Manager を用いれば容易に拡張できると考えられる<br />
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403 <img src="./pictures/overNAT.svg" alt="opt" width="60%" /> </li>
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404 </ul>
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405
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406
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407 </div>
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408 <div class='slide '>
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409 <!-- _S9SLIDE_ -->
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410 <h1 id="section-9">今後の課題</h1>
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411 <ul>
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412 <li>APIの再設計
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413 <ul>
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414 <li>put/updateに対しtake/peekがcreate()・setKey()の操作はわかりにくい</li>
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415 </ul>
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416 </li>
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417 <li>DSの型情報のマネジメント
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418 <ul>
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419 <li>型情報がないのでpeek/takeする際にわかりにくい</li>
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420 </ul>
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421 </li>
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422 <li>セキュリティをサポートしていない
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423 <ul>
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424 <li>圧縮と同様の手法で暗号形式のデータ表現を扱えるように拡張可能</li>
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425 </ul>
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426 </li>
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427 </ul>
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428
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429 <style type="text/css">
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430 <!--
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436 list-style-type:disc;
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437 }
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438
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439 .slide h1{
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440 text-align:left;
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443 margin-bottom: 50px;
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444 }
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446 div#slide1 h1{
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447 text-align:left;
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448 color:#777777;
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449 font:bold 60px 'PT Sans', sans-serif;
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450 margin-bottom: 50px;
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451 }
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455 }
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457 img[alt="opt"]{
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458 display: block;
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461 }
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463 img[alt="right"]{
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464 margin-right: 0;
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465 }
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467 table {
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470 }
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472 th {
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473 font-size: 120%;
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474 }
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475 -->
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476 </style>
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478 <!-- === end markdown block === -->
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479 </div>
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482 </div><!-- presentation -->
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483 </body>
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484 </html>