In vivo mapping of functional domains and axonal connectivity in cat visual cortex using magnetic resonance imaging

Noninvasive cognitive neuroimaging studies based on functional magnetic resonance imaging (fMRI) are of ever-increasing importance for basic and clinical neurosciences. The explanatory power of fMRI could be greatly expanded, however, if the pattern of the neuronal circuitry underlying functional activation could be made visible in an equally noninvasive manner. In this study, blood oxygenation level-dependent (BOLD)-based fMRI and diffusion tensor imaging (DTI) were performed in the same cat visual cortex, and the foci of fMRI activation utilized as seeding points for 3D DTI fiber reconstruction algorithms, thus providing the map of the axonal circuitry underlying visual information processing. The methods developed in this study will lay the foundation for in vivo neuroanatomy and the ability for noninvasive longitudinal studies of brain development.     

基于波前像差的视网膜空间像调制度测定

提出了一种计算复色光下人眼视网膜空间像调制度的方法.利用Hartmann-Shack波前传感器测量的波前像差数据，求得眼睛光学系统的调制传递函数；利用CSV-1000测试仪和VAF-1000视锐度测试仪分别测量同一只眼睛的全眼对比敏感度函数以及视锐度，由调制传递函数、对比敏感度函数以及视锐度之间的关联获得复色光下人眼视网膜空间像调制度曲线.结果表明：视网膜空间像调制度曲线与眼光学系统的调制传递函数无关，并且正常人眼（无视网膜疾病）的视网膜空间像调制度值相近.因此多眼的空间像调制度曲线的统计平均值可以作为标准，用来评判人眼视网膜及视神经疾病.     

Biclustering Three-Dimensional Data Arrays With Plaid Models

Three-dimensional data arrays (collections of individual data matrices) are increasingly prevalent in modern data and pose unique challenges to pattern extraction and visualization. This article introduces a biclustering technique for exploration and pattern detection in such complex structured data. The proposed framework couples the popular plaid model together with tools from functional data analysis to guide the estimation of bicluster responses over the array. We present an efficient algorithm that first detects biclusters that exhibit strong deviations for some data matrices, and then estimates their responses over the entire data array. Altogether, the framework is useful to home in on and display underlying structure and its evolution over conditions/time. The methods are scalable to large datasets, and can accommodate a variety of dynamic patterns. The proposed techniques are illustrated on gene expression data and bilateral trade networks. Supplementary materials are available online.     

A high contrast and capacity efficient visual cryptography scheme for the encryption of multiple secret images

The visual secret sharing for multiple secrets (VSSM) allows for the encryption of a greater number of secret images into a given image area. Previous researches on VSSM schemes incur a very serious pixel expansion that will damage capable of increasing the capacity of secret image encryption. Moreover, the most of VSSM schemes will decrease the contrast of recover images while the amount of secret image encryption increases. These drawbacks limit applicability of the existing VSSM schemes. In this paper, we propose a highly efficient encryption algorithm to cope with this problem. The proposed algorithm adopts a novel hybrid encryption approach that includes a VC-based encryption and a camouflaging process. The experimental results demonstrate that the proposed approach not only can increase the capacity efficient for VSSM schemes, but also maintains an excellent level of contrast in the recovered secret images.     

采用FTIR和电子能谱EDS指纹图谱直观比对鉴定右归丸济生肾气丸

结合FTIR和电子能谱EDS指纹图谱,鉴别了两种组成相近的中药复方右归丸和济生肾气丸.测定右归丸和济生肾气丸样品氯仿提取物的红外指纹图谱,依据W检验理论判别方法精细建立两种中药复方红外指纹图谱的特征吸收峰组,确定了各个特征吸收峰相对应的特征分子基团和药物成分组成.同时测量两种中药复方原药粉末样品的EDS指纹图谱.根据两...     

Design of solids for antigravity motion illusion

This paper presents a method for designing solid shapes containing slopes where orientation appears opposite to the actual orientation when observed from a unique vantage viewpoint. The resulting solids generate a new type of visual illusion, which we call “impossible motion”, in which balls placed on the slopes appear to roll uphill thereby defying the law of gravity. This is possible because a single retinal image lacks depth information and human visual perception tries to interpret images as the most familiar shape even though there are infinitely many possible interpretations. We specify the set of all possible solids represented by a single picture as the solution set of a system of equations and inequalities, and then relax the constraints in such a way that the antigravity slopes can be reconstructed. We present this design procedure with examples.     

用VB模拟分析加速度为简谐函数的质点运动

用Visual Basic实现了加速度为简谐函数的质点的a-t,v-t,y-t图线的计算机描绘,通过运行程序,可以让我们直观理解加速度为正弦函数的质点的运动.     

Hierarchical and conditional combination of belief functions induced by visual tracking

In visual tracking, sources of information are often disrupted and deliver imprecise or unreliable data leading to major data fusion issues. In the Dempster-Shafer framework, such issues can be addressed by attempting to design robust combination rules. Instead of introducing another rule, we propose to use existing ones as part of a hierarchical and conditional combination scheme. The sources are represented by mass functions which are analysed and labelled regarding unreliability and imprecision. This conditional step divides the problem into specific sub-problems. In each of these sub-problems, the number of constraints is reduced and an appropriate rule is selected and applied. Two functions are thus obtained and analysed, allowing another rule to be chosen for a second (and final) fusion level. This approach provides a fast and robust way to combine disrupted sources using contextual information brought by a particle filter. Our experiments demonstrate its efficiency on several visual tracking situations.     

Analysis of patient self-assessment visual analogue scales

The present paper describes an example of practical analysis of data from an application of visual analogue scales. Potentially useful and simple methods for analysing visual analogue scales are described for effective handling of complex data when the desire is to compare two or more groups of patients. Visual analogue scales were used to assess subjective tolerability in the International Prospective Primary Prevention Study in Hypertension, a large scale clinical trial. The methods are illustrated on the IPPPSH data.     

光纤陀螺捷联系统标定测试软件的设计与开发

基于 windows 平台,采用 VC 6.0 开发了光纤陀螺捷联惯组标定测试软件,着重阐述了该软件的设计思想和关键技术的实现。该软件实现了对光纤陀螺捷联组合误差系数的标定与测试,为光纤陀螺捷联系统标定测试提供了方便,具有很强的工程实用价值。