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Towards Cost-Effective Cloud Downloading with Tencent Big Data

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Journal of Computer Science & Technology 2015年第6期30卷 1163-1174页

作者：李振华刘刚嵇智源 roger Zimmermann School of Software Tsinghua University Beijing 100084 China Tsinghua National Laboratory for Information Science and Technology Beijing 100084 China QQXuanfeng System Group Tencent Co. Ltd Shanghai 200233 China High Technology Research and Development Center Ministry of Science and Technology Beijing 10004 China Department of Computer Science National University of Singapore Singapore 117417 Singapore

The cloud downloading scheme, first proposed by us in 2011, has effectively optimized hundreds of millions of users＇ downloading experiences. Also, people start to build a variety of useful Internet services on top of cloud downloading. In brief, by using cloud facilities to download （and cache） the requested file from the ＂best-effort＂ Internet on behalf of the user, cloud downloading ensures the data availability and remarkably enhances the data delivery speed. Although this scheme seems simple and straightforward, designing a real-world cloud downloading system involves complicated and subtle trade-offs （between deployment cost and user experience） when serving a large number of users： 1） how to plan the cloud cache capacity to achieve a high and affordable cache hit ratio, 2） how to accelerate the data delivery from the cloud to numerous users, 3） how to handle the dense user requests for highly popular files, and 4） how to judge a potential downloading failure of the cloud. This paper addresses these design trade-offs from a practical perspective, based on big data from a nationwide commercial cloud downloading system, i.e., Tencent QQXuanfeng. Its running traces help us find reasonable design strategies and parameters, and its real performances confirm the efficacy of our design. Our study provides solid experiences and valuable heuristics for the developers of similar and relevant systems.

关键词： cloud downloading cost-effective design trade-off big data

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儒学是改变世界的动力——安乐哲先生访谈录

走进孔子（中英文） 2024年第4期 52-56页

作者：安乐哲宫英英北京大学哲学系尼山世界儒学中心(中国孔子基金会秘书处)综合部中国孔子网

自18岁远跨重洋赴中国香港做交换生开始,安乐哲先生的人生轨迹就此转变。一次为诗歌创作积累人生经验的东方之旅,意外地开启了他研习、翻译、传播中国哲学的道路。受劳思光、唐君毅等学者的影响,安乐哲对中国哲学产生了浓厚的兴趣。

关键词：人生经验唐君毅安乐哲中国香港劳思光人生轨迹东方之旅浓厚的兴趣

LOCATING THE CONFUCIAN NOTION OF PERSON WITHIN AN INTERPRETIVE CONTEXT

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中国比较文学 2014年第2期 1-15页

作者： roger T.Ames University of Hawai’i

本文以"气"之过程宇宙论为诠释语境,对儒家人格观进行了较为清晰的透视。通过参较唐君毅、李泽厚等人的相关看法,本文指出,只有遵循儒家伦理学自身的运作方式方能达到对儒家"成人"之先决条件的细微体察。在"人—类"与"成人"的概念之间... 详细信息

本文以"气"之过程宇宙论为诠释语境,对儒家人格观进行了较为清晰的透视。通过参较唐君毅、李泽厚等人的相关看法,本文指出,只有遵循儒家伦理学自身的运作方式方能达到对儒家"成人"之先决条件的细微体察。在"人—类"与"成人"的概念之间存有差异:前者强调,人具有抽象性与生物性的同一本质,个人虽如彼此独立之原子,然而均领受同样之本质,故能成为同"类"的一员。而儒家的"成人"概念,始于独特而多样性的家庭关系。此一家庭关系,膏泽深厚,洵属既伴随人之初生、却又可无尽延展的生命资源,浸润于斯,相互陶养,人格便终可抵于成型。与此不同,西方的"人—类"概念,具有根本的个人主义蕴涵,所造就的是其性格特征可以数字精确算计的"某个人",他们通过形成习惯来获得道德品质。儒家的"成人",是在关系的脉络之中,通过有效而又有品味涵养的个性行为来寻求独特而卓越的品格。个性并非先天给予,而是经由陶养构成人格的诸重关系而后天养成。

关键词：儒家人格观气过程宇宙论儒家的“成人” (西方的)“人—类”观

A Frisch-Newton Algorithm for Sparse Quantile Regression

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Acta Mathematicae Applicatae Sinica 2005年第2期21卷 225-236页

作者： roger Koenker Pin Ng Department of Economics University of Illinois at Urbana-Champaign IL 61820 USACollege of Business Administration Northern Arizona University 70 McConnell Dr P.O. Box 15066 FlagstaffAZ 86011-5066. USA.

Recent experience has shown that interior-point methods using a log barrierapproach are far superior to classical simplex methods for computing solutions to large parametricquantile regression problems. In many large empirical applications, the design matrix has a verysparse structure. A typical example is the classical fixed-effect model for panel data where theparametric dimension of the model can be quite large, but the number of non-zero elements is quitesmall. Adopting recent developments in sparse linear algebra we introduce a modified version of theFrisch-Newton algorithm for quantile regression described in Portnoy and Koenker[28]. The newalgorithm substantially reduces the storage (memory) requirements and increases computational *** modified algorithm also facilitates the development of nonparametric quantile regressionmethods. The pseudo design matrices employed in nonparametric quantile regression smoothing areinherently sparse in both the fidelity and roughness penalty components. Exploiting the sparsestructure of these problems opens up a whole range of new possibilities for multivariate smoothingon large data sets via ANOVA-type decomposition and partial linear models.

关键词： Quantile regression interior-point algorithm sparse linear algebra

Dilemmas and Pathways to Dealing with Flood Problems in Twenty-First Century China

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International Journal of Disaster Risk Science 2011年第3期2卷 21-30页

作者： Guoyi Han roger E.Kasperson Stockholm Environment Institute(SEI) 10691 StockholmSweden Graduate School of Geography Clark UniversityMA 01610USA

With more than 60 percent of China’s 1.34 billion population,about 50 percent of its most productive arable land,and the world’s second largest and rapidly growing national GDP exposed to flooding of various kinds,China has an intractable flood *** potential impacts of climate change and continued intensification of floodplain development driven by rapid industrialization and urbanization,it is very likely that China will see a continued increase of exposure to floods this *** overview article outlines and discusses fundamental dilemmas,plausible pathways,and key options for managing future flood risks in China in the context of rapid socioeconomic transition and climate *** dilemmas are the embedded difficult trade-off choices,from balancing economic development with flood vulnerability reduction,to coordination and cooperation among increasingly diverse actors and across *** plausible pathways,this article argues that a resilience strategy for managing flood risk is *** would require human adjustment to flood,not by aiming for full protection and control but by adjusting our use of floodplains,integrating and experimenting with a wide range of flood risk management options,so that a dynamic balance is maintained between exposure and coping capacity and flood risk is contained at an acceptable *** variability and uncertainty lies at the heart of such a flood resilience centered *** the flood toll cannot be had without trade-offs in economic development,food production,and agricultural productivity.

关键词： flood continued floods

East Meets West in Shanghai: But Is There a Learning Society on the Road to Cathay?

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开放教育研究 2005年第4期11卷 56-64页

作者： roger Boshier

Lifelong education was developed in Europe in the 1970's. A learning society arises when principles of adult education are properly deployed. Vertical integration concerns learning throughout the lifespan. Horizontal integration requires education to occur in informal and nonformal as well as familiar formal settings. Democratization demands the dismantling of barriers that impede access to education and involvement of learners in the design and management of their own education. Chinese citizens have always learned from a broad array (of not just educational settings). The initiative to build 61 "learning cities" demonstrates a genius for adapting western ideas. China has already transcended some limitations of European ideas about lifelong education. However, because of ageism, the obsession with formal education and need to navigate within the contours of the party-state, building a learning society faces special challenges. In China, as elsewhere, universities are not leading these initiatives. They need to become more flexible and open.

关键词：终身学习学习型社会成人教育教育民主学习型城市

THREE-DIMENSIONAL GEO-MORPHOLOGICAL MODELLING OF ESTUARINE WATERS

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International Journal of Sediment Research 2003年第1期18卷 1-16页

作者： Morteza.KOLAHDOOZAN,roger A.FALCONER Department of Civil and Environmental Engineering AmirKabir University Halcrow Professor of Environmental Water Management Cardiff School of Engineering Cardiff University Assistant Professor Tehran Iran UK

Details are given herein of the development and application of a three-dimensional layer integrated numerical model to predict geo-morphological changes in estuarine waters. An Alternating Direction Implicit finite difference algorithm has been used for solving the governing differential equations, which include the conservation of mass and momentum for the hydrodynamics, the transport equation for suspended sediment fluxes and the sediment mass conservation equation for bed level changes. The model includes a modified term for the initiation of motion, which takes account of the unsteady nature of the flow. Model predictions have been compared with results of other model studies reported in the literature and also laboratory measurements, with the refined criteria for the initiation of motion for tidal currents giving improved results. Finally, the model has been applied to predict bed level changes due to suspended sediment fluxes in the Humber Estuary, UK.

关键词： Sediment transport Numerical models Geo-morphological changes Estuarine processes

Meta-analysis quantifying the potential of dietary additives and rumen modifiers for methane mitigation in ruminant production systems

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Animal Nutrition 2021年第4期7卷 1219-1230页

作者： Amelia K.Almeida roger SHegarty Annette Cowie School of Environmental and Rural Science University of New EnglandArmidaleNSW2351Australia NSW Department of Primary Industries Trevenna RdArmidaleNSW2351Australia

Increasingly countries are seeking to reduce emission of greenhouse gases from the agricultural industries,and livestock production in particular,as part of their climate change *** many reviews update progress in mitigation research,a quantitative assessment of the efficacy and performance-consequences of nutritional strategies to mitigate enteric methane(CH_(4))emissions from ruminants has been lacking.A meta-analysis was conducted based on 108 refereed papers from recent animal studies(2000-2020)to report effects on CH4 production,CH_(4) yield and CH_(4) emission intensity from 8 dietary *** interventions(oils,microalgae,nitrate,ionophores,protozoal control,phytochemicals,essential oils and 3-nitrooxypropanol).Of these,macroalgae and 3-nitrooxypropanol showed greatest efficacy in reducing CH_(4) yield(g CH_(4)/kg of dry matter intake)at the doses *** confidence intervals derived for the mitigation efficacies could be applied to estimate the potential to reduce national livestock emissions through the implementation of these dietary interventions.

关键词： Beef cattle Methane emissions abatement Dairy cattle Greenhouse gas Sheep

Nanoparticles based sensors for rapid detection of foodborne pathogens

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International Journal of Agricultural and Biological Engineering 2013年第1期6卷 28-35页

作者： Paul Chen Yanbin Li Tianhong Cui roger Ruan Department of Bioproducts and Biosystems Engineering University of Minnesota1390 Eckles Ave.St.PaulMN 55108 Department of Biological&Agricultural Engineering 203 Engineering HallUniversity of ArkansasFayettevilleAR 72701 Department of Mechanical Engineering University of Minnesota111 Church Street SEMinneapolisMN 55455 Department of Food Science and Nutrition University of Minnesota1390 Eckles Ave.St.PaulMN 55108

Rapid detection of foodborne pathogens is a key step in the control of food related *** methods for the detection of food pathogens,although typically sensitive,often require multiple time-consuming steps such as extraction,isolation,enrichment,counting,etc.,prior to measurement,resulting in testing times which can be *** is a need to develop rapid and sensitive detection *** review is intended to provide food scientists and engineers an overview of current rapid detection methods,a close look at the nanoparticles especially magnetic nanoparticle-antibody conjugates based methods,and identification of knowledge gaps and future research needs.

关键词： nano-sensor magnetic nano-particle food pathogens nuclear magnetic resonance