A high optical efficiency 3D/2D convertible integral imaging display

We propose a high optical efficiency three‐dimensional (3D)/two‐dimensional (2D) convertible integral imaging display by using a pinhole array on a reflective polarizer. The 3D mode is realized by adopting a pinhole array on a reflective polarizer to generate a point light source array. Three‐dimensional/2D convertible feature is realized by electrically controlling a polarization switcher. The reflective polarizer can reflect the light that has the orthogonal polarization direction with the reflective polarizer and transmit the light that has the same polarization direction with the reflective polarizer. The reflected light is recycled, so the optical efficiencies for both 3D and 2D modes are enhanced. In the practical experiments, the optical efficiencies of the proposed integral imaging display increase by 8.04 times and 1.65 times in 3D and 2D modes comparing with the conventional integral imaging display that has no light recycle, respectively.     

基于B/S结构的高职人才培养评价机制抽样系统设计与实现

完善高职人才培养评价机制是发展高职教育的有效手段,“点线面体”立体型高职人才培养评价机制是对高职人才培养模式的创新和探索。介绍了基于B/S结构的“点线面体”立体型高职人才培养评价机制抽样系统的设计与实现,阐述了随机选取学生进行考核的分层抽样功能模块,总结了系统的实际应用。     

一种多维集成直觉模糊信息的信任评价方法

信任是保证在线服务质量的前提。针对电子商务环境存在的复杂性、模糊性和不确定性等因素,引入直觉模糊理论,提出了一种多维集成直觉模糊信息的信任评价方法,给出了两类信任反馈属性集成直觉模糊信息的方法,通过直觉模糊熵确定属性权重,并利用直觉加权算数平均算子求出实体的综合直觉模糊数,从而全面、客观和细腻地反映信任的模糊性和不确定性。计算实例和仿真实验表明,基于多维集成直觉模糊信息的信任评估方法是可行的,通过对风险偏好因子的灵敏度分析,发现服务请求者风险偏好不同,则评估的服务提供商的信任得分也不同;同时也验证了该方法可以有效地抑制恶意节点的攻击,为电子商务环境下信任评价的研究提供了新思路。     

浅谈校园网网络性能评估

本文介绍了校园网网络性能评估背景和网络性能指标,针对网络性能指标提出了网络性能评估的技术与方法,并且介绍了如何选择评估工具,为校园网网络性能评估提供了理论依据。     

Sparkle measurement revisited: A closer look at the details

Four years after introduction of the first instrument for measurement of sparkle, the foundations have been reconsidered, and the pool of practical experience has been analyzed to provide a more detailed and complete picture of the subject matter. The following aspects are introduced and discussed: observation conditions and resulting requirements for imaging (sampling) and filtering, analysis of spatial periods and frequencies as a basis for filtering, spatial filtering concepts, sparkle in the frequency domain, sparkle evaluation based on analysis of single images and difference images, origins of unwanted sparkle components, scaling and offset in sparkle evaluation, and verification of the method.     

Distributed non-cooperative robust MPC based on reduced-order models

In this paper, a non-cooperative distributed MPC algorithm based on reduced order model is proposed to stabilize large-scale systems. The large-scale system consists of a group of interconnected subsystems. Each subsystem can be partitioned into two parts: measurable part, whose states can be directly measured by sensors, and the unmeasurable part. In the online computation phase, only the measurable dynamics of the corresponding subsystem and neighbour-to-neighbour communication are necessary for the local controller design. Satisfaction of the state constraints and the practical stability are guaranteed while the complexity of the optimization problem is reduced. Numerical examples are given to show the effectiveness of this algorithm.     

面向三维模型高效观察的视点选择技术综述

高效的模型观察,对提高生产实践工作效率具有重要的意义。为此,视点选择技术在近些年得到了很大的发展,是提高模型观察效果的重要技术之一。文章对视点选择技术进行了较系统的梳理,重点讨论了视点度量技术及其发展现状,并探讨了视点采样技术的发展及视点选择技术在多方面应用的情况。最后,讨论了视点选择技术的发展趋势及其应用前景。     

Spatial Water Use efficiency Index towards resource sustainability: application in the island of Crete,Greece

This paper introduces a new index to test water resource sustainability in regions where groundwater is the main source of water supply. The Spatial Water Use efficiency Index (SWUI) is a geographical information system (GIS) environment index which expresses the ratio of potential available water volume (groundwater recharge minus water needs) to the respective water needs. Its low and/or negative values indicate water stress. SWUI is applied in the island of Crete, Greece, where water needs are mainly covered by groundwater abstractions. The annual water mass balance is estimated using the RIBASIM (River Basin Simulation) model. The total freshwater needs in the Cretan region reach 535 hm³ annually according to the model's simulation. SWUI with values ranging from ? 0.8 to 214.3 has proved to be an important visual tool towards depicting the low efficiency of the east part of the island to cover water demand and a useful decision-making tool in the sustainability evaluation of groundwater aquifers.     

水生态文明城市建设相对有效性分析

本文利用数据包络线法(DEA)分析水生态文明城市建设过程中,资源投入对于水生态环境改善的影响程度,通过对建设决策单元的有效性及投影分析,指导资源的投入,实现资源的优化配置,为水生态文明城市建设评价指标体系的构建以及综合评价提供建议。     

大柳树灌区宁夏分区水资源承载力综合评价

通过构建模糊综合评判模型及包含水资源、社会经济、生态环境3个子系统11个因素的水资源承载力综合评判指标体系,对大柳树灌区宁夏分区水资源承载力状况进行了综合评价。结果表明:两个水平年(2020年、2030年)水资源承载能力虽有一定的规模,仍有一定开发利用潜力,水资源对区内国民经济发展有一定的保证,但综合评分值由现状年的0.597降至2020年、2030年的0.528及0.478,承载力逐步下降,有轻微转向恶化的可能。通过采用节水技术并调整产业结构等措施,水资源供需矛盾将得到一定的缓解。