Theoretical analysis of a multiple-effect diffusion still producing highly concentrated seawater

A multiple-effect diffusion still producing highly concentrated seawater was theoretically analyzed taking variations of the boiling point elevation (BPE) into account. The still consists of a series of seawater-soaked wicks stuck on closely-spaced parallel plates with the first plate steam-heated at 100°C and the last plate cooled in 30°C ambient air. Evaporation from the wicks increases the BPE more rapidly at downstream distances closer to exits of evaporating areas, and this increase reduces evaporation flux significantly at downstream regions on the wicks. An 80% heat recovery from products of hot condensate and concentrate reduces the steam consumption by 46%. The steam consumption decreases more rapidly with an increasing number of wicks than does the production rate; thus, a lower steam consumption ratio is observed for the still having more wicks. Narrowing the gaps between the plates greatly increases the production rate with a slight decrease in the steam consumption ratio. The still with 19 wicks with 1 m by 2 m evaporating areas, 5 mm gaps and 80% heat recovery produces 12 kg distillate and 3.3 kg concentrate of 0.16 kg/kg-water concentration per 1 kg steam consumption with a 26.4 kg/h distillate production rate.     

SSI:一种IPv6/IPv4多址同源识别模型

IPv6/IPv4共存环境下多址同源识别是共存网络管理与拓扑发现的一个关键问题。现有研究主要集中于子网内部的双栈发现及单一IP协议栈中的别名解析,难以识别远程IPv6/IPv4共存网络中的多址同源。通过分析同源地址间的本质联系,提出一种IPv6/IPv4多址同源识别模型(SSI),该模型综合利用特殊地址格式匹配、TCP时钟指纹比对和上层协议短时致瘫等多种方式来提高同源地址的识别能力。实验结果表明,上述方法均可有效识别IPv6/IPv4多址同源;SSI模型具有较理想的识别率和正确率。     

游戏产品有效粘合用户时间的策略研究

通过对游戏的分类、发展历程梳理以及用户的需求分析,结合游戏产生过程给出了游戏产品有效粘合用户时间的策略,最后预测了游戏的发展趋势。     

Introducing robustness in model predictive control with multiple modelsand switching

Model predictive control is model-based. Therefore, the procedure is inherently not robust to modelling uncertainties. Further, a crucial design parameter is the prediction horizon. Only offline procedures to estimate an upper bound of the optimal value of this parameter are available. These procedures are computationally intensive and model-based. Besides, a single choice of this horizon is perhaps not the best option at all time instants. This is especially true when the control objective is to track desired trajectories. In this paper, we resolve the issue by a time-varying horizon achieved by switching between multiple model-predictive controllers. The stability of the overall system is discussed. In addition, an introduction of multiple models to handle modelling uncertainties makes the overall system robust. The improvement in performance is demonstrated through several examples.     

由隐性记忆引导的交互设计研究

认知心理学介入到交互设计领域受到越来越多学者的关注,但是关于无意识的隐性记忆的介入却甚少被提及。,文章从隐性记忆的特征、隐性记忆介入交互设计的价值以及隐性记忆引导交互设计的应用三方面进行研究和探索,通过对目标群体用户隐性记忆的普遍性研究,找到更高效的设计来提高用户体验。     

感性的科技——浅析可穿戴设备的未来发展趋势

2013年被称为可穿戴设计元年,在发展过程中,其始终未能成为生活中的必需品,是因为忽略了最重要的两个方面：一是找到最恰当的人机交互关系;二是满足用户真正的需求。而满足了这两方面就可以帮助建立更亲密的,回归原本的,人与人之间的沟通,＂以人为本＂的理念更促进了可穿戴设计内部操作关系与外在表现形式的研究和探索。而数据背后的分析服务不仅能增强用户对于可穿戴设计更完整更智能的体验,更有利于可穿戴设计企业更长久更完善的商业发展。     

基于规则的汉语名名组合的自动释义研究

该文以现代汉语(特别是网络搜索词)中的名名组合为主要研究对象,探索一种基于规则的汉语名名组合的自动释义方法。其研究步骤为: (1)利用《现代汉语语义词典》中名词的语义类别,来建立名名组合的语义类组合模式;(2)在“生成词库论”中物性角色思想的指导下,用名名组合中某个名词的施成角色或功能角色作为释义动词,来揭示这两个名词之间的语义关系;(3)以语义类组合模式为单位构建名名组合的释义模板,并汇集成名名搭配数据库;(4)利用《知网》资源,来获取具体名词的施成角色和功能角色,建立汉语名词知识库。在这两个数据库的基础上,我们初步实现了一个汉语名名组合的自动释义程序。     

Puzzle: A mobile application development environment using a jigsaw metaphor

ObjectiveCreate a visual mobile end user development framework, named Puzzle, which allows end users without IT background to create, modify and execute applications, and provides support for interaction with smart things, phone functions and web services.MethodsDesign of an intuitive visual metaphor and associated interaction techniques for supporting end user development in mobile devices with iterative empirical validation.ResultsOur results show that the jigsaw is an intuitive metaphor for development in a mobile environment and our interaction techniques required a limited cognitive effort to use and learn the framework. Integration of different modalities and usage of smart things was relevant for users.ConclusionPuzzle has addressed the main objective. The framework further contributes to the research on mobile end user development in order to create an incentive for users to go beyond consuming content and applications to start creating their own applications.PracticeUsage of a mobile end user development environment has the potential to create a shift from the conventional few-to-many distribution model of software to a many-to-many distribution model. Users will be able to create applications that fit their requirements and share their achievements with peers.ImplicationsThis study has indicated that the Puzzle visual environment has the potential to enable users to easily create applications and stimulate exploration of innovative scenarios through smartphones.     

CDMA系统扩频地址码的性能研究与分析

CDMA技术以不同的正交码序列区分不同的用户,所以称为"码分多址"技术。混沌是非线性系统中出现的确定性的,类随机的过程。混沌系统最基本的特征是对初始值具有敏感性,尤其在伪随机码的产生方面,这些独具特色的性质使得混沌在通信应用领域有着很好的应用前景。该文利用MATLAB编程实现对基于不同扩频码(m,gold,Logistic)的系统性能进行仿真分析,比较其性能优劣。     

关于AUTO CAD在图形图像教学领域的多元结合应用

AUTO CAD是一款交互式计算机辅助设计以及绘图的软件,在传统的教学中很多学生都认为这款软件的学习十分困难,所以很难提起学习兴趣,还有一些学生学习了后面的知识就会忘记前面的知识,这就使得教学质量与效率很难提升。为此,教师应积极主动探索有效的教学方式,激发学生的ATUO CAD软件的学习兴趣,提升教学和学习的质量。本文就探讨ATUO CAD在图形图像教学领域的多元结合应用。