講座名稱：Scalability and Liquidation Enhancement in QoS Lightning Networks

講座人：吳杰 教授

講座時間：3月26日10:00

講座地點：ZOOM會議直播（會議ID:https://temple.zoom.us/j/7348129717）

講座人介紹：

吳杰博士是天普大學網(wǎng)絡計算中心的主任和Laura H.Carbell教授。他還擔任科學技術學院國際事務主任。他于2009年夏季至2016年夏季擔任天普大學計算機和信息科學系的系主任，并于2015年秋季至2017年夏季擔任國際事務副總教務長。在加入天普大學之前，他是美國國家科學基金會的項目主任，也是佛羅里達大西洋大學的杰出教授。他目前的研究興趣包括移動計算和無線網(wǎng)絡，路由協(xié)議，云和綠色計算，網(wǎng)絡信任和安全，以及社交網(wǎng)絡應用。他在多個編輯委員會任職，包括IEEE移動計算期刊，IEEE服務計算期刊，并行和分布式計算雜志以及計算機科學與技術雜志。吳博士曾擔任IEEE MASS 2006，IEEE IPDPS 2008，IEEE ICDCS 2013，ACM MobiHoc 2014，ICPP 2016和IEEE CNS 2016的共同主席，以及IEEE INFOCOM 2011和CCF CNCC 2013的program聯(lián)合主席。他是IEEE計算機協(xié)會特邀訪問者，ACM杰出發(fā)言人和IEEE分布式處理技術委員會（TCDP）主席。吳博士是AAAS Fellow和IEEE Fellow。他是2011年中國計算機學會（CCF）海外杰出成就獎的獲得者

講座內(nèi)容：

The lightning network (LN) is a special network in Bitcoin that uses offchain micropayment channels to scale the blockchain’s capability to perform instant transactions without a global block confirmation process. However, micropayment scalability in a large LN and liquidation for small nodes still remain major challenges for the LN. In this talk, we introduce the notion of supernodes and the corresponding supernodes-based pooling to address these challenges. In order to meet the high adaptivity and low maintenance cost in the dynamic LN where users join and leave, supernodes are constructed locally without any global information or label propagation. Each supernode, together with a subset of (non-supernodes) neighbors, forms a supernode-based pool. These pools constitute a partition of the LN. Additionally, supernodes are self-connected. Micropayment scalability is supported through node set reduction as only supernodes are involved in searching and in payment with other supernodes. Liquidation is enhanced through pooling to redistribute funds within a pool to external channels of its supernode. Simulations have been conducted to validate the improvement in routing scalability and liquidation of the proposed architecture under different settings.

主辦單位：通信工程學院