<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
        {font-family:Calibri;
        panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
        {margin-top:0in;
        margin-right:0in;
        margin-bottom:4.0pt;
        margin-left:0in;
        font-size:12.0pt;
        font-family:"Times New Roman","serif";}
h1
        {mso-style-priority:9;
        mso-style-link:"Heading 1 Char";
        margin-top:24.0pt;
        margin-right:0in;
        margin-bottom:4.0pt;
        margin-left:0in;
        mso-add-space:auto;
        font-size:14.0pt;
        font-family:"Cambria","serif";
        font-weight:bold;}
h1.CxSpFirst
        {mso-style-priority:9;
        mso-style-link:"Heading 1 Char";
        mso-style-type:export-only;
        margin-top:24.0pt;
        margin-right:0in;
        margin-bottom:0in;
        margin-left:0in;
        margin-bottom:.0001pt;
        mso-add-space:auto;
        font-size:14.0pt;
        font-family:"Cambria","serif";
        font-weight:bold;}
h1.CxSpMiddle
        {mso-style-priority:9;
        mso-style-link:"Heading 1 Char";
        mso-style-type:export-only;
        margin:0in;
        margin-bottom:.0001pt;
        mso-add-space:auto;
        font-size:14.0pt;
        font-family:"Cambria","serif";
        font-weight:bold;}
h1.CxSpLast
        {mso-style-priority:9;
        mso-style-link:"Heading 1 Char";
        mso-style-type:export-only;
        margin-top:0in;
        margin-right:0in;
        margin-bottom:4.0pt;
        margin-left:0in;
        mso-add-space:auto;
        font-size:14.0pt;
        font-family:"Cambria","serif";
        font-weight:bold;}
h2
        {mso-style-priority:9;
        mso-style-link:"Heading 2 Char";
        margin-top:10.0pt;
        margin-right:0in;
        margin-bottom:4.0pt;
        margin-left:0in;
        font-size:13.0pt;
        font-family:"Cambria","serif";
        font-weight:bold;}
h3
        {mso-style-priority:9;
        mso-style-link:"Heading 3 Char";
        margin-top:10.0pt;
        margin-right:0in;
        margin-bottom:4.0pt;
        margin-left:0in;
        line-height:112%;
        font-size:12.0pt;
        font-family:"Cambria","serif";
        font-weight:bold;}
h4
        {mso-style-priority:9;
        mso-style-link:"Heading 4 Char";
        margin-top:10.0pt;
        margin-right:0in;
        margin-bottom:4.0pt;
        margin-left:0in;
        font-size:12.0pt;
        font-family:"Cambria","serif";
        font-weight:bold;
        font-style:italic;}
h5
        {mso-style-priority:9;
        mso-style-link:"Heading 5 Char";
        margin-top:10.0pt;
        margin-right:0in;
        margin-bottom:4.0pt;
        margin-left:0in;
        font-size:12.0pt;
        font-family:"Cambria","serif";
        color:#7F7F7F;
        font-weight:bold;}
h6
        {mso-style-priority:9;
        mso-style-link:"Heading 6 Char";
        margin-top:0in;
        margin-right:0in;
        margin-bottom:4.0pt;
        margin-left:0in;
        line-height:112%;
        font-size:12.0pt;
        font-family:"Cambria","serif";
        color:#7F7F7F;
        font-weight:bold;
        font-style:italic;}
p.MsoHeading7, li.MsoHeading7, div.MsoHeading7
        {mso-style-priority:9;
        mso-style-link:"Heading 7 Char";
        margin-top:0in;
        margin-right:0in;
        margin-bottom:4.0pt;
        margin-left:0in;
        font-size:12.0pt;
        font-family:"Cambria","serif";
        font-style:italic;}
p.MsoHeading8, li.MsoHeading8, div.MsoHeading8
        {mso-style-priority:9;
        mso-style-link:"Heading 8 Char";
        margin-top:0in;
        margin-right:0in;
        margin-bottom:4.0pt;
        margin-left:0in;
        font-size:10.0pt;
        font-family:"Cambria","serif";}
p.MsoHeading9, li.MsoHeading9, div.MsoHeading9
        {mso-style-priority:9;
        mso-style-link:"Heading 9 Char";
        margin-top:0in;
        margin-right:0in;
        margin-bottom:4.0pt;
        margin-left:0in;
        font-size:10.0pt;
        font-family:"Cambria","serif";
        letter-spacing:.25pt;
        font-style:italic;}
p.MsoTitle, li.MsoTitle, div.MsoTitle
        {mso-style-priority:10;
        mso-style-link:"Title Char";
        margin-top:0in;
        margin-right:0in;
        margin-bottom:4.0pt;
        margin-left:0in;
        mso-add-space:auto;
        border:none;
        padding:0in;
        font-size:26.0pt;
        font-family:"Cambria","serif";
        letter-spacing:.25pt;}
p.MsoTitleCxSpFirst, li.MsoTitleCxSpFirst, div.MsoTitleCxSpFirst
        {mso-style-priority:10;
        mso-style-link:"Title Char";
        mso-style-type:export-only;
        margin:0in;
        margin-bottom:.0001pt;
        mso-add-space:auto;
        border:none;
        padding:0in;
        font-size:26.0pt;
        font-family:"Cambria","serif";
        letter-spacing:.25pt;}
p.MsoTitleCxSpMiddle, li.MsoTitleCxSpMiddle, div.MsoTitleCxSpMiddle
        {mso-style-priority:10;
        mso-style-link:"Title Char";
        mso-style-type:export-only;
        margin:0in;
        margin-bottom:.0001pt;
        mso-add-space:auto;
        border:none;
        padding:0in;
        font-size:26.0pt;
        font-family:"Cambria","serif";
        letter-spacing:.25pt;}
p.MsoTitleCxSpLast, li.MsoTitleCxSpLast, div.MsoTitleCxSpLast
        {mso-style-priority:10;
        mso-style-link:"Title Char";
        mso-style-type:export-only;
        margin-top:0in;
        margin-right:0in;
        margin-bottom:4.0pt;
        margin-left:0in;
        mso-add-space:auto;
        border:none;
        padding:0in;
        font-size:26.0pt;
        font-family:"Cambria","serif";
        letter-spacing:.25pt;}
p.MsoSubtitle, li.MsoSubtitle, div.MsoSubtitle
        {mso-style-priority:11;
        mso-style-link:"Subtitle Char";
        margin-top:0in;
        margin-right:0in;
        margin-bottom:30.0pt;
        margin-left:0in;
        font-size:12.0pt;
        font-family:"Cambria","serif";
        letter-spacing:.65pt;
        font-style:italic;}
a:link, span.MsoHyperlink
        {mso-style-priority:99;
        color:blue;
        text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
        {mso-style-priority:99;
        color:purple;
        text-decoration:underline;}
em
        {mso-style-priority:20;
        letter-spacing:.5pt;
        border:none;
        font-weight:bold;}
p
        {mso-style-priority:99;
        mso-margin-top-alt:auto;
        margin-right:0in;
        mso-margin-bottom-alt:auto;
        margin-left:0in;
        font-size:12.0pt;
        font-family:"Times New Roman","serif";}
p.MsoNoSpacing, li.MsoNoSpacing, div.MsoNoSpacing
        {mso-style-priority:1;
        margin-top:0in;
        margin-right:0in;
        margin-bottom:4.0pt;
        margin-left:0in;
        font-size:12.0pt;
        font-family:"Times New Roman","serif";}
p.MsoListParagraph, li.MsoListParagraph, div.MsoListParagraph
        {mso-style-priority:34;
        margin-top:0in;
        margin-right:0in;
        margin-bottom:4.0pt;
        margin-left:.5in;
        mso-add-space:auto;
        font-size:12.0pt;
        font-family:"Times New Roman","serif";}
p.MsoListParagraphCxSpFirst, li.MsoListParagraphCxSpFirst, div.MsoListParagraphCxSpFirst
        {mso-style-priority:34;
        mso-style-type:export-only;
        margin-top:0in;
        margin-right:0in;
        margin-bottom:0in;
        margin-left:.5in;
        margin-bottom:.0001pt;
        mso-add-space:auto;
        font-size:12.0pt;
        font-family:"Times New Roman","serif";}
p.MsoListParagraphCxSpMiddle, li.MsoListParagraphCxSpMiddle, div.MsoListParagraphCxSpMiddle
        {mso-style-priority:34;
        mso-style-type:export-only;
        margin-top:0in;
        margin-right:0in;
        margin-bottom:0in;
        margin-left:.5in;
        margin-bottom:.0001pt;
        mso-add-space:auto;
        font-size:12.0pt;
        font-family:"Times New Roman","serif";}
p.MsoListParagraphCxSpLast, li.MsoListParagraphCxSpLast, div.MsoListParagraphCxSpLast
        {mso-style-priority:34;
        mso-style-type:export-only;
        margin-top:0in;
        margin-right:0in;
        margin-bottom:4.0pt;
        margin-left:.5in;
        mso-add-space:auto;
        font-size:12.0pt;
        font-family:"Times New Roman","serif";}
p.MsoQuote, li.MsoQuote, div.MsoQuote
        {mso-style-priority:29;
        mso-style-link:"Quote Char";
        margin-top:10.0pt;
        margin-right:.25in;
        margin-bottom:4.0pt;
        margin-left:.25in;
        font-size:12.0pt;
        font-family:"Times New Roman","serif";
        font-style:italic;}
p.MsoIntenseQuote, li.MsoIntenseQuote, div.MsoIntenseQuote
        {mso-style-priority:30;
        mso-style-link:"Intense Quote Char";
        margin-top:10.0pt;
        margin-right:.8in;
        margin-bottom:14.0pt;
        margin-left:.7in;
        text-align:justify;
        border:none;
        padding:0in;
        font-size:12.0pt;
        font-family:"Times New Roman","serif";
        font-weight:bold;
        font-style:italic;}
span.MsoSubtleEmphasis
        {mso-style-priority:19;
        font-style:italic;}
span.MsoIntenseEmphasis
        {mso-style-priority:21;
        font-weight:bold;}
span.MsoSubtleReference
        {mso-style-priority:31;
        font-variant:small-caps;}
span.MsoIntenseReference
        {mso-style-priority:32;
        font-variant:small-caps;
        letter-spacing:.25pt;
        text-decoration:underline;}
span.MsoBookTitle
        {mso-style-priority:33;
        font-variant:small-caps;
        letter-spacing:.25pt;
        font-style:italic;}
p.MsoTocHeading, li.MsoTocHeading, div.MsoTocHeading
        {mso-style-priority:39;
        margin-top:24.0pt;
        margin-right:0in;
        margin-bottom:4.0pt;
        margin-left:0in;
        mso-add-space:auto;
        font-size:14.0pt;
        font-family:"Cambria","serif";
        font-weight:bold;}
p.MsoTocHeadingCxSpFirst, li.MsoTocHeadingCxSpFirst, div.MsoTocHeadingCxSpFirst
        {mso-style-priority:39;
        mso-style-type:export-only;
        margin-top:24.0pt;
        margin-right:0in;
        margin-bottom:0in;
        margin-left:0in;
        margin-bottom:.0001pt;
        mso-add-space:auto;
        font-size:14.0pt;
        font-family:"Cambria","serif";
        font-weight:bold;}
p.MsoTocHeadingCxSpMiddle, li.MsoTocHeadingCxSpMiddle, div.MsoTocHeadingCxSpMiddle
        {mso-style-priority:39;
        mso-style-type:export-only;
        margin:0in;
        margin-bottom:.0001pt;
        mso-add-space:auto;
        font-size:14.0pt;
        font-family:"Cambria","serif";
        font-weight:bold;}
p.MsoTocHeadingCxSpLast, li.MsoTocHeadingCxSpLast, div.MsoTocHeadingCxSpLast
        {mso-style-priority:39;
        mso-style-type:export-only;
        margin-top:0in;
        margin-right:0in;
        margin-bottom:4.0pt;
        margin-left:0in;
        mso-add-space:auto;
        font-size:14.0pt;
        font-family:"Cambria","serif";
        font-weight:bold;}
span.Heading1Char
        {mso-style-name:"Heading 1 Char";
        mso-style-priority:9;
        mso-style-link:"Heading 1";
        font-family:"Cambria","serif";
        font-weight:bold;}
span.Heading2Char
        {mso-style-name:"Heading 2 Char";
        mso-style-priority:9;
        mso-style-link:"Heading 2";
        font-family:"Cambria","serif";
        font-weight:bold;}
span.Heading3Char
        {mso-style-name:"Heading 3 Char";
        mso-style-priority:9;
        mso-style-link:"Heading 3";
        font-family:"Cambria","serif";
        font-weight:bold;}
span.Heading4Char
        {mso-style-name:"Heading 4 Char";
        mso-style-priority:9;
        mso-style-link:"Heading 4";
        font-family:"Cambria","serif";
        font-weight:bold;
        font-style:italic;}
span.Heading5Char
        {mso-style-name:"Heading 5 Char";
        mso-style-priority:9;
        mso-style-link:"Heading 5";
        font-family:"Cambria","serif";
        color:#7F7F7F;
        font-weight:bold;}
span.Heading6Char
        {mso-style-name:"Heading 6 Char";
        mso-style-priority:9;
        mso-style-link:"Heading 6";
        font-family:"Cambria","serif";
        color:#7F7F7F;
        font-weight:bold;
        font-style:italic;}
span.Heading7Char
        {mso-style-name:"Heading 7 Char";
        mso-style-priority:9;
        mso-style-link:"Heading 7";
        font-family:"Cambria","serif";
        font-style:italic;}
span.Heading8Char
        {mso-style-name:"Heading 8 Char";
        mso-style-priority:9;
        mso-style-link:"Heading 8";
        font-family:"Cambria","serif";}
span.Heading9Char
        {mso-style-name:"Heading 9 Char";
        mso-style-priority:9;
        mso-style-link:"Heading 9";
        font-family:"Cambria","serif";
        letter-spacing:.25pt;
        font-style:italic;}
span.TitleChar
        {mso-style-name:"Title Char";
        mso-style-priority:10;
        mso-style-link:Title;
        font-family:"Cambria","serif";
        letter-spacing:.25pt;}
span.SubtitleChar
        {mso-style-name:"Subtitle Char";
        mso-style-priority:11;
        mso-style-link:Subtitle;
        font-family:"Cambria","serif";
        letter-spacing:.65pt;
        font-style:italic;}
span.QuoteChar
        {mso-style-name:"Quote Char";
        mso-style-priority:29;
        mso-style-link:Quote;
        font-style:italic;}
span.IntenseQuoteChar
        {mso-style-name:"Intense Quote Char";
        mso-style-priority:30;
        mso-style-link:"Intense Quote";
        font-weight:bold;
        font-style:italic;}
span.EmailStyle45
        {mso-style-type:personal-compose;
        font-family:"Times New Roman","serif";}
.MsoChpDefault
        {mso-style-type:export-only;
        font-size:10.0pt;}
.MsoPapDefault
        {mso-style-type:export-only;
        margin-bottom:4.0pt;}
@page WordSection1
        {size:8.5in 11.0in;
        margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
        {page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><table class=MsoNormalTable border=0 cellpadding=0 width=600 style='width:6.25in'><tr><td style='padding:.75pt .75pt .75pt .75pt'><div class=MsoNormal align=center style='text-align:center'><span style='font-size:11.0pt'><hr size=2 width="100%" align=center></span></div><p align=center style='text-align:center'><span style='font-size:11.0pt'>Boston University -- Computer Science Department<br><br><strong>C O L L O Q U I U M</strong><br><br>Thursday&nbsp;April 21, 2011<br>11:00am - 12:15pm<br>MCS-135<o:p></o:p></span></p><div class=MsoNormal align=center style='text-align:center'><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:blue'><hr size=2 width="100%" align=center></span></div></td></tr><tr><td style='padding:.75pt .75pt .75pt .75pt'><p align=center style='text-align:center'><strong><span style='font-size:11.0pt'>Management of Overlay Traffic by means of Economic and Incentives&#8217; Mechanisms </span></strong><span style='font-size:11.0pt'><o:p></o:p></span></p><p align=center style='text-align:center'><strong><span style='font-size:11.0pt'>George D. Stamoulis<o:p></o:p></span></strong></p><p align=center style='text-align:center'><span style='font-size:11.0pt'>Department of Informatics, Athens University of Economics and Business<o:p></o:p></span></p><p align=center style='text-align:center'><strong><span style='font-size:11.0pt;color:black;font-weight:normal'><a href="http://nes.aueb.gr/users/gs.html"><b>http://nes.aueb.gr/users/gs.html</b></a> <o:p></o:p></span></strong></p><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p><strong><span style='font-size:11.0pt'>Abstract:</span></strong><span style='font-size:11.0pt'> Globally optimal traffic management and control, even when performed centrally by a single Internet Service Provider (ISP) in its own Autonomous System (AS), requires knowledge of users&#8217; preferences for quality. Such information is often privately known by the users only (rather than the ISP too), which is a case of Information Asymmetry. Matters become more complicated when users from multiple ASes are involved in a particular application (e.g., a BitTorrent swarm), due to the private information on each domain&#8217;s properties. In both cases, the preferences of the stakeholders (ISPs, application providers, users) involved can be conflicting; e.g. BitTorrent users prefer downloading more content, while ISPs prefer less traffic in costly inter-domain links. Therefore, distributed and incentive-based approaches are required that employ economic concepts and mechanisms to deal with the problem in a way that is acceptable by all stakeholders involved. In this presentation, I will first motivate the use of such approaches. Then, I will consider the case of optimizing the traffic generated by applications based on overlays, such as peer-to-peer (P2P) file-sharing and video-streaming, which at present generate huge volumes of traffic in the Internet due to their high popularity and large size of the files exchanged. I will present the approach of Economic Traffic Management (ETM), developed by EU-funded project SmoothIT, which deals with the overlay traffic in a way that is incentive compatible for all parties involved. Thus, ETM leads the system to a so-called &quot;TripleWin&quot; situation, which is mutually beneficial for users, overlay providers and ISPs. I will also present the main mechanisms employed by ETM, and assess their effectiveness towards achieving &quot;TripleWin&quot;.<b><o:p></o:p></b></span></p><p><b><span style='font-size:11.0pt'>Short Biography: </span></b><span style='font-size:11.0pt'>George D. Stamoulis received the Diploma in Electrical Engineering (1987, with highest honours) from the National Technical University of Athens, Greece, and the MS (1988) and PhD (1991) degrees in Electrical Engineering from the Massachusetts Institute of Technology, USA. From 1995 to 2000 he was an Assistant Professor at the Computer Science Department of the University of Crete, Greece, and a member of the Telecommunications and Networks Division of the Institute of Computer Science, Foundation for Research and Technology Hellas (ICS-FORTH). Since 2001 he is a faculty member, currently Professor, in the Department of Informatics of Athens University of Economics and Business (AUEB). His research interests are in network economics, auction mechanisms for bandwidth, charging for telecommunications services, reputation mechanisms for electronic environments, and telecommunications regulation. He has published about 55 papers in scientific journals such as IEEE/ACM Transactions on Networks, Telecommunications Systems, Computer Communications, IEEE Transactions on Communications, Journal of the ACM, and IEEE Transactions on Information Theory, as well as in conferences such as INFOCOM, ITC, ACM SIGMETRICS and GP2PC. He has also collaborated with the Greek Regulatory Authorities for Communications and Power on auction design as well as with Greek telecom companies on service pricing. </span><span style='font-size:11.0pt'>&nbsp;</span><span style='font-size:11.0pt'><o:p></o:p></span></p><p><strong><span style='font-size:11.0pt'>Host:</span></strong><span style='font-size:11.0pt'> Azer Bestavros<o:p></o:p></span></p></blockquote></td></tr><tr><td style='padding:.75pt .75pt .75pt .75pt'><div class=MsoNormal align=center style='text-align:center'><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:blue'><hr size=2 width="100%" align=center></span></div></td></tr></table><p><span style='font-size:11.0pt'>&nbsp;<o:p></o:p></span></p></div></body></html>