基于多臂赌博机算法的推荐系统研究

随着各类移动端应用与网页端应用技术的不断发展,各类推荐系统与人类生活联系逐渐变得更为密切;用户对于推荐系统的推荐效果要求日益提高,持续单一的推荐内容已经不能满足用户不断提高的要求,因此如何精准对接用户需求,解决数据稀疏问题并提供给用户更为精确的推荐效果都已经成为推荐问题中亟待解决的问题。同时各种推荐系统技术不断发展,文章对近年来各种基于MAB算法的推荐系统的研究动态和最新进展进行了综述,对其基本概念和算法的核心思想以及评价指标诸如点击率,运行时长以及累积遗憾等方面进行了分析比较,并对推荐系统技术的发展趋势和应用前景进行了预测。     

Variation and Distribution: Forest Patterns as a Model for Urban Morphologies

What can we learn from the spatial logic of collections of trees in the rainforest? Evan Greenberg of the EmTech programme at the Architectural Association (AA) School of Architecture in London and George Jeronimidis of the Centre for Biomimetics at the University of Reading combine forces to analyse the rainforest's morphology and its potential as an urban model. They suggest how the sectional height differentiation of trees could present a new way of thinking about urban organisation, accommodating varied microclimates, programmes and the city's infrastructural flows.     

基于高斯过程与批量汤普森抽样的动态定价策略

考虑短期内需求不确定情况下同类型产品的定价策略研究,引入高斯过程进行需求函数的学习,利用批量汤普森算法建立基于探索-利用的两阶段学习和决策过程的定价模型。在利用提出的GP-PTS（Gaussian process-parallel Thompson sampling）算法完成数值实验和某平台出行的真实数据应用后得出的结果表明：算法的精准度取决于特征是否完备,若给定一个先验且产品特征完备时,基于GP-PTS算法模拟出来的价格会取得比目前平台价格策略更好的收益,为企业在短期内进行定价决策提供良好借鉴。     

SAI Consultants

The work of Bangkok-based Bundit Chulasai runs the full gamut of building types from palace restorations to private houses, resorts and even discount supermarkets. Brian McGrath describes how Chulasai's ‘successful “adaptive practice” with SAI Consultants creates a critical mirror to reflect the last 30 years of Thai society’. Copyright © 2009 John Wiley & Sons, Ltd.     

Metabolism and Morphology

Architecture is on the cusp of systemic change, driven by the dynamics of climate and economy, of new technologies and new means of production. There is a growing interest in the dynamics of fluidity, in networks and in the new topologies of surfaces and soft boundaries. This is part of a general cultural response to the contemporary reconfiguration of the concept of ‘nature’ within the discourse of architecture; a change from metaphor to model, from ‘nature’ as a source of formal inspiration to ‘nature’ as a mine of interrelated dynamic processes that are available for analysis and digital simulation. Michael Weinstock presents an account of the dynamics of natural metabolisms, and suggests an agenda for the development of metabolic morphologies of buildings and cities. Copyright © 2008 John Wiley & Sons, Ltd.     

The Global Architectural Influences on London

London today has become ‘a laboratory and testing ground’ for neoliberal capitalism, attracting investment from the Middle East, Russia, India, the Far East and Australasia as well as the US. Murray Fraser describes the urban impact of economic globalisation in the capital, while exploring ways that it might potentially be countered. Copyright © 2012 John Wiley & Sons, Ltd.     

基于MEI方法的贴体网格FDTD方法

利用Thompson变换在任意形状的散射体外部产生共形的外部计算网络,并使FDTD计算区域的截断边界与散射体边界形状完全一致,时域不变性测试方程（MEI）方法被作为该截断边界上的局域吸收边界条件,从而大大压缩了FDTD的计算空间。数值试验结果证实,该方法可在不降低计算精度的前提下减少计算机内存需求。     

无核白葡萄多酚氧化酶特性研究

从新疆无核白葡萄中分离出多酚氧化酶（ＰＰＯ）并对其部分特性进行了研究。结果表明其最适ｐＨ为７,且在ｐＨ３处存在相对活力的４５％,最适温度为２０℃。酶催化反应动力学方程为Ｖ＝０．０９１「ｓ」／５４．０１＋「ｓ」,对「ｓ」来说属于分数级反应ｐｐｏ对儿茶素和咖啡酸的催化能力强于绿原酸和邻苯二酚,对一元酚和对间二酚,对一元酚和对间二酚不起作用。本研究为探明新疆无核白葡萄荫干过程中酶促褐变的内部原因提供了理     

分束李普奇棱镜与分束汤普逊棱镜性能的比较分析

为了更好地设计和选择使用分束李普奇棱镜和分束格兰•汤普逊棱镜,本文从理论上分析了分束李普奇棱镜与分束格兰•汤普逊棱镜的分束角、分离角和光强分束比。结果表明：分束李普奇棱镜和分束格兰•汤普逊棱镜的分束角和光强分束比与棱镜的结构角和副结构角有关;对于相同的结构角和副结构角,两种棱镜的分束角相同,但它们的光强分束比不同。出射的 光与 光的分离角与副结构角有关;对于 光垂直出射的需要,选用分束李普奇棱镜设计为好;对于大分束角的需要,选用分束格兰•汤普逊棱镜设计为好。     

Emergence and the Forms of Metabolism

Earlier this year, Michael Weinstock published a seminal book, The Architecture of Emergence: The Evolution of Form in Nature and Civilisation, which challenges established cultural and architectural histories. The conventional worldview is expanded by placing human development alongside ecological development: the history of cultural evolution and the production of cities are set in the context of processes and forms of the natural world. As well as providing a far-reaching thesis, Weinstock's book gives lucid and accessible explanations of the complex systems of the physical world. In this abridged extract from Chapter 5, Weinstock explains the dynamics of individual and collective metabolisms from which intelligence and social and spatial orders emerge. Copyright © 2010 John Wiley & Sons, Ltd.