2016年以来，美国和俄罗斯之间展开了新一轮的“媒体冷战”，社交媒体在这场“新冷战”中扮演了非常重要的角色。本文以影响力最大的互联网机构俄罗斯“互联网研究所”（Internet Research Agency，以下简称“IM”）及其在美国的运作为...2016年以来，美国和俄罗斯之间展开了新一轮的“媒体冷战”，社交媒体在这场“新冷战”中扮演了非常重要的角色。本文以影响力最大的互联网机构俄罗斯“互联网研究所”（Internet Research Agency，以下简称“IM”）及其在美国的运作为典型案例，分析和梳理全球传播时代以社交平台为核心开展的媒体战、舆论战与心理战所表现出的新动向和新特点。展开更多
An incremental redundancy hybrid automatic repeat- request （IR-HARQ）scheme based on irregular repeat-accumulate （IRA）codes is proposed. The design of rate compatible punctured IRA codes suitable for an IR-HARQ sch...An incremental redundancy hybrid automatic repeat- request （IR-HARQ）scheme based on irregular repeat-accumulate （IRA）codes is proposed. The design of rate compatible punctured IRA codes suitable for an IR-HARQ scheme is well formulated and efficiently solved by a linear-programming method, along with a one-dimensional approach for density evolution. Compared to IR-HARQ schemes based on turbo codes, simulation shows that the proposed IR-HARQ schemes based on IRA codes may achieve almost the same performance at a block size of 1 024, but better throughput at a block size of 4 096. The advantages of the proposed scheme in implementation, including decoding complexity and parallelism, make it more attractive in practice than the IR-HARQ schemes based on both turbo and LDPC codes.展开更多
文摘2016年以来，美国和俄罗斯之间展开了新一轮的“媒体冷战”，社交媒体在这场“新冷战”中扮演了非常重要的角色。本文以影响力最大的互联网机构俄罗斯“互联网研究所”（Internet Research Agency，以下简称“IM”）及其在美国的运作为典型案例，分析和梳理全球传播时代以社交平台为核心开展的媒体战、舆论战与心理战所表现出的新动向和新特点。
基金The National High Technology Research and Develop-ment Program of China(863Program)(No.2006AA01Z263)the National Natural Science Foundation of China(No.60672081)+1 种基金the Natural Science Foundation of Jiangsu Province(No.BK2006502)the Open Research Fund of National Mobile Communications Research Laboratory of Southeast Uni-versity(No.2008N01)
文摘An incremental redundancy hybrid automatic repeat- request （IR-HARQ）scheme based on irregular repeat-accumulate （IRA）codes is proposed. The design of rate compatible punctured IRA codes suitable for an IR-HARQ scheme is well formulated and efficiently solved by a linear-programming method, along with a one-dimensional approach for density evolution. Compared to IR-HARQ schemes based on turbo codes, simulation shows that the proposed IR-HARQ schemes based on IRA codes may achieve almost the same performance at a block size of 1 024, but better throughput at a block size of 4 096. The advantages of the proposed scheme in implementation, including decoding complexity and parallelism, make it more attractive in practice than the IR-HARQ schemes based on both turbo and LDPC codes.
