The American transportation landscape is changing. Americans, especially young people, are driving less for the first time in recorded history, and this trend is expected to continue in the foreseeable future (Davis and Baxandall 2013). This shift has been accompanied by a corresponding increase in popularity of alternative transportation models such as carsharing and ridesharing (Shaheen 2013). Presently, these models only focus on dense urban areas, and current research (Martin and Shaheen 2011) suggests that carsharing and ridesharing programs work best when paired with existing public transportation infrastructure. However, large suburban master planned communities (MPCs) are also increasing in popularity in the United States (Spivak 2012), and the majority of these communities have limited transit options (Mercedes-Benz R&D North America). We explored opportunities for new transportation solutions in these large communities by evaluating existing solutions, interviewing potential users, and analyzing interview and survey data from residents in a specific community. We found that there is an unmet need for a shared transportation solution in a large MPC and designed and implemented a mobile application to demonstrate such a solution. Our application has comparable performance, functionality, and ease of use to other transportation applications and, once implemented, will help residents save time, money, and the environment.

关键词：汽车;Web应用程序;流动性解决方案

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In this work, we conduct a numerical investigation of the structural feasibility of a flexible, monolithic and planar optoelectronic system based on low Tg polymers using ANSYS?. In particular, we explore the effectiveness of two eutectic compounds 52w.%In 48w.%Sn and 58w.%Bi 42w.%Sn to solder light sources and sinks to multimode light waveguides. First, we analyze the warpage of the optical structures due to eutectic soldering. Furthermore, we study the spectrum of mechanical stresses within the eutectic layer. Then, we investigate the possibility of roll-to-roll mass production. Finally, we establish design guidelines for decreasing the system warpage, and consequently preserving optical alignment, while complying with the ultimate shear strength of the eutectic material.

关键词：共晶焊接；低Tg聚合物；多模光波导

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关键词：国资委；减开支；降本增效

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移动互联网的发展给传统互联网带来了巨大的冲击，导致了互联网商业模式的转变，同时也造成了大量传统互联网用户的流失。本文以典型的社交网络服务人人网为例，分析移动互联网对其所带来的用户流失，移动SNS是否吸引了新的用户资源，从用户的角度探究移动社交网络的发展趋势。

关键词：移动互联网；人人网；用户流失；社交网络

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The s-step Lanczos method is an attractive alternative to the classical Lanczos method as it enables an O(s) reduction in data movement over a xed number of iterations. This can signi cantly improve performance on modern computers. In order for s-step methods to be widely adopted, it is important to better understand their error properties. Although the s-step Lanczos method is equivalent to the classical Lanczos method in exact arithmetic, empirical observations demonstrate that it can behave quite di erently in nite precision. In the s-step Lanczos method, the computed Lanczos vectors can lose orthogonality at a much quicker rate than the classical method, a property which seems to worsen with increasing s.

关键词：误差分析；兰索斯法；有限精度

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中国城市处于快速发展时期，城市人口集聚膨胀，交通拥挤和环境污染的压力越发紧张。智慧的理念被认为可以解决城市的烦恼。日本政府和公司“以人为核心”，在其不大的国土面积上容纳更多的人口和经济活动进行了非常多有价值的探索和创造：从居家环境的智能化设计，到社区环境的智能化构建，从城市交通的低碳智能化建设，到垂直花园城市的打造，同为走紧凑节约低碳道路的中国城镇化，这些经验或许值得借鉴。

关键词：日本；智慧城市；智能；垂直花园城市

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关键词：广电总局；互联网电视集成服务牌照；停止发放

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关键词：重庆电信；装维服务；产品化

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Computer-based learning environments offer the potential for innovative assessments of student knowledge and personalized instruction for learners. However, there are a number of challenges to realizing this potential. Many psychological models are not specific enough to directly deploy in instructional systems, and computational challenges can arise when considering the implications of a particular theory of learning. While learners’ interactions with virtual environments encode significant information about their understanding, existing statistical tools are insufficient for interpreting these interactions. This research develops computational models of teaching and learning and combines these models with machine learning algorithms to interpret learners’ actions and customize instruction based on these interpretations. This approach results in frameworks that can be adapted to a variety of educational domains, with the frameworks clearly separating components that can be shared across tasks and components that are customized based on the educational content. Using this approach, this dissertation addresses three major questions: (1) How can one diagnose learners’ knowledge from their behavior in games and virtual laboratories? (2) How can one predict whether a game will be diagnostic of learners’ knowledge? and (3) How can one customize instruction in a computer-based tutor based on a model of learning in a domain?

关键词：概率模型;游戏设计;虚拟环境

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RISC-V (pronounced \risk- ve") is a new instruction set architecture (ISA) that was originally designed to support computer architecture research and education, but which we now hope will become a standard open architecture for industry implementations.

关键词：指令集架构；指令集手册；计算机体系结构；开放式体系结构

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