Mirai僵尸网络恶意程序分析和监测数据研究

近年来,随着物联网的兴起,以僵尸网络为代表的恶意程序正在逐渐向物联网领域渗透,已经出现利用物联网脆弱的安全防护进行传播并发动拒绝服务攻击的恶意代码。首先介绍了Mirai僵尸网络的整体架构,对其受控端和控制端等多个组件的主要功能进行了研究;然后对通过主动和被动方式获取的监测数据展开分析,并在此基础上,对Mirai僵尸网络恶意程序的监测发现和应对建议进行了讨论。     

Comparison of well-to-wheels energy use and emissions of a hydrogen fuel cell electric vehicle relative to a conventional gasoline-powered internal combustion engine vehicle

The operation of hydrogen fuel cell electric vehicles (HFCEVs) is more efficient than that of gasoline conventional internal combustion engine vehicles (ICEVs), and produces zero tailpipe pollutant emissions. However, the production, transportation, and refueling of hydrogen are more energy- and emissions-intensive compared to gasoline. A well-to-wheels (WTW) energy use and emissions analysis was conducted to compare a HFCEV (Toyota Mirai) with a gasoline conventional ICEV (Mazda 3). Two sets of specific fuel consumption data were used for each vehicle: (1) fuel consumption derived from the U.S. Environmental Protection Agency's (EPA's) window-sticker fuel economy figure, and (2) weight-averaged fuel consumption based on physical vehicle testing with a chassis dynamometer on EPA's five standard driving cycles. The WTW results show that a HFCEV, even fueled by hydrogen from a fossil-based production pathway (via steam methane reforming of natural gas), uses 5%–33% less WTW fossil energy and has 15%–45% lower WTW greenhouse gas emissions compared to a gasoline conventional ICEV. The WTW results are sensitive to the source of electricity used for hydrogen compression or liquefaction.     

基于恶意代码传播日志的网络安全态势分析

网络安全态势一直是网络安全从业人员的关注点。本文基于2018年10月至2019年3月的我国恶意代码的传播日志,利用恶意代码的静态特征、动态特征及其传播特征对网络态势进行分析。然后基于社区发现算法,对其中传播最广泛的Mirai家族程序构成的网络进行团伙发现,结果表明,社区发现算法能够将Mirai网络识别为多个社区,社区间的域名资源具有明显的差异性,社区内域名资源具有相似性。     

横浜“港口未来21世纪”规划的分析与借鉴

横浜位于东京大都市圈的核心地区,是著名的国际港口城市。在漫长的历史发展进程中,横浜作为京浜工业地带的核心城市,其沿海地区的港口和以制造业为代表的产业聚集为日本经济的高速发展做出了巨大贡献。20世纪80年代以后,为了适应经济全球化的大趋势,立足于21世纪新型港口城市的建设．横浜市开始编制实施名为“港口未来21世纪”的城市总体规划,对临海港口地区进行了大规模的改造。本文从地理学的角度对横浜“港口未来21世纪”规划的理念、总体构思和规划方法进行了分析,探讨了横浜“港口未来21世纪”规划对我国港口城市的规划和现代化建设的借鉴意义。     

Automotive fuel cell stack and system efficiency and fuel consumption based on vehicle testing on a chassis dynamometer at minus 18 °C to positive 35 °C temperatures

This paper presents an in-depth laboratory technology assessment of a 2016 Toyota Mirai Fuel Cell (FC) vehicle based on chassis dynamometer testing. The 114.6 kW FC stack has a high dynamic response, which makes this powertrain a FC-dominant hybrid electric vehicle. The measured peak efficiency is 66.0% FC stack and 63.7% FC system with an idle hydrogen flow rate of 4.39 g/hr. The high FC system efficiencies at low loads match typical vehicle power spectrums, resulting in a high average vehicle efficiency of 62% compared to 45% and 23% for a hybrid electric vehicle and a conventional vehicle, respectively. An energy breakdown accounts for the FC stack losses, FC system losses, air compressor loads, and heater loads for different drive cycles and different thermal conditions. The cold-start North American city drive cycle (UDDS) energy consumption values are, respectively, 758, 581, 226, and 321 Wh/km at ambient conditions of −18 °C, −7 °C, 25 °C and 35 °C with 850 W/m² of solar loading. The FC system shutdown and startup processes at temperatures below the freezing point contribute to the increased hydrogen consumption. The raw test data files are available for download, thus providing the research community with a public reference data on a modern production automotive FC system.     

Making Buildings – 30 June - 21 November 2001, Middlesbrough, Manchester, Aberystwyth, United Kingdom.

No Abstract.  .