Imaging: A Tool for Data Reduction

This article illustrates the use of high-resolution color graphic images obtained from raster terminals to reduce an immense amount of data into a few meaningful time series. The steps that were taken to achieve this data reduction and their appropriate images are given. The time series were analyzed using Box and Jenkins time series methods (see also McCleary and Hay 1980), and the results are discussed.     

It’s about the process,not the result: An fMRI approach to explore the encoding of explicit and implicit price information

This research examines the neurophysiological correlates of consumers’ price memory processes. We focus on the explicit and implicit dimensions of consumers’ price knowledge and use an experimental functional Magnetic Resonance Imaging (fMRI) study to assess how the encoding of task-dependent price memory affects the choice process and neural activation. The findings of our study add to the field of consumer neuroscience by demonstrating how neural correlates of explicit and implicit task-dependent price memory can shed light on processes that guide consumer decision-making. Over the course of our experiment we found that consumers did not always make consistent decisions, but that their decisions were influenced by explicit components of price memory. Implicit price memory components seem to have a more supportive role in the decision-making process. In summary, we found that price memory is a dynamic construct that is influenced by unconscious and neurophysiological processes, and we conclude that a neurophysiological perspective can add value for consumer and marketing research.     

论《二十年目睹之怪现状》的道德批判

把《二十年目睹之怪现状》看做是《新小说》杂志的一部分,以民族主义想像入手,并将它与其他＂新小说＂作互文对读后,认为在小说结构上渗透了吴趼人的道德关怀,以及在对伦理体系崩溃的叙述中隐含了一定的道德批判;并且指出了小说的遁世倾向,这是因为作者暂时觅寻不到正路。     

护理干预对冠状动脉CT检查结果的影响分析

目的：评价护理干预对冠状动脉CTA（computed tomography angiography）检查患者心理状况、检查成功率、图像质量的影响。方法：选取我院2013年1月至2014年12月行冠脉CTA检查的500例患者,随机分为研究组（n=250）和对照组（n=250）,对照组仅进行常规护理,研究组则同时进行心理护理、心室率控制、呼吸屏气训练。结果：487例患者最终完成冠脉CT检查,其中研究组中2例、对照组中11例因严重焦虑恐惧及屏气不佳终止检查。研究组焦虑症状、心率、血压变化明显低于对照组,检查的成功率及图像质量显著提高（P<0.05）。结论：护理干预可减小冠脉CT检查患者的心理应激,提高检查的成功率及图像质量。     

热印头发热元件阻值一致性的差值测试法

从热印头的结构与工作原理出发，分析了热印头发热元件的特点，提出了发热元件阻值的测试方法，给出了测量结果．     

基于指导滤波的单次曝光强度关联成像研究

针对低采样条件下单次曝光强度关联成像重构图像质量不理想问题,提出一种基于指导滤波的单次曝光强度关联成像重构算法。首先,通过快速投影Landweber正则化获得较低质量的初始估计图像,然后将该图像作为指导图像,采用指导滤波进行多次联合迭代,最后获得去噪后的高质量重构图像。在不同采样率条件下与基于压缩感知全变差低秩约束算法的重构图像进行了对比分析,数值模拟和实验结果均证明了本文算法的有效性。     

基于Gold矩阵的计算关联成像研究

测量矩阵是决定计算关联成像图像重构质量和成像速度的重要因素之一。本文提出一种新的测量矩阵优化构造方法,利用伪随机序列生成Gold矩阵,该矩阵同时具有Random矩阵的随机性和Hadamard矩阵的确定性。数值模拟和实验结果表明:在满采样条件下,Gold矩阵和Hadamard矩阵均能够实现完美的重构图像;在欠采样条件下,Gold矩阵重构图像质量明显优于Random矩阵和Hadamard矩阵。     

On difference-based variance estimation in nonparametric regression when the covariate is high dimensional

Summary.  We consider the problem of estimating the noise variance in homoscedastic nonparametric regression models. For low dimensional covariates t  ∈  R ^d ,  d =1, 2, difference-based estimators have been investigated in a series of papers. For a given length of such an estimator, difference schemes which minimize the asymptotic mean-squared error can be computed for d =1 and d =2. However, from numerical studies it is known that for finite sample sizes the performance of these estimators may be deficient owing to a large finite sample bias. We provide theoretical support for these findings. In particular, we show that with increasing dimension d this becomes more drastic. If d 4, these estimators even fail to be consistent. A different class of estimators is discussed which allow better control of the bias and remain consistent when d 4. These estimators are compared numerically with kernel-type estimators (which are asymptotically efficient), and some guidance is given about when their use becomes necessary.     

自聚焦成象透镜

本文从光学成象理论分析了自聚焦透镜的原理,对日本板硝子(株)研制的自聚焦透镜列阵(SLA)的类型及特性进行了介绍,文章对自聚焦透镜的光学参数和外形尺寸计算方法作了讨论,并且对自聚焦透镜列阵的成象质量和测量方法进行了分析,文末提出了自聚焦透镜列阵在复印机设计和装配调整工作上允许接受的误差范围。     

脑科学的发展对认知心理学的深刻影响

脑成像技术在认知心理学领域中取得了重要成果:在记忆系统的认知研究中,由于引进了脑成像技术,使得多重记忆系统的模型得到了更为可靠的试验数据的支持;内隐记忆与外显记忆两个分离系统的存在也获得了进一步的证实;再认记忆的研究,发现了"熟悉性"和"回想"两种不同形式的记忆功能。在语言产生的认知研究中,由于引进了脑成像技术,使试验结果非常好地支持了语言生成的三阶段理论。在关于思维的研究中,借助于脑成像技术,人们对思维与语言的关系有了更为深入的认识,对顿悟的研究也取得了令人鼓舞的成果。