Evidence for curvilinear interpolation from dot alignment judgements

Visual interpolation between dots responsible for rectilinear versus curvilinear contour interpretation was examined with the psychophysical forced directional response (FDR) paradigm. Regular four-dot polygon segments, together with a target dot, were presented to the subjects for 150 ms. Subjects were required to indicate the direction of deviation of the target dot from the midpoint of the intermediate line segment. Crucial variables were the outer angle of the line segments and symmetry axis orientation of the polygon segment. Logistic regression analyses showed that curvilinear interpolation occurred for angles up to 30 degrees, but emerged more pervasively under the vertical symmetry axis orientation for angles up to 60 degrees.     

空间插值法在人群包虫病患病率预测中的应用

目的探索不同空间插值方法在人群包虫病患病率预测中的应用并比较其效果。方法以四川、西藏、甘肃和青海四省(区)青藏高原地区2012年全国包虫病流行情况调查获得的124个藏区县的人群包虫病患病率数据为基础,使用Arcgis10.0软件,采用局部多项式插值法、反距离权重插值法和kriging插值法进行空间插值,比较青海省治多县和玛多县人群包虫病患病率推算的效果。结果 3种方法预测的精度各有优势,对青海省治多县和玛多县人群包虫病患病率误差最小的为Kriging插值方法,预测的患病率分别为2.04%和5.28%。结论空间插值方法可用于青海省治多县和玛多县人群包虫病患病率预测,以Kriging插值法的预测效果较好。     

An algorithm for the recovery of fetal heart rate series from CTG data

Cardiotocography (simultaneous recording of fetal heart rate (FHR) and uterine contractions) is one of the most used diagnostic techniques to evaluate fetal well-being and to investigate the functional state of the fetal autonomic nervous system. Recently, great interest has been paid to the variability of the FHR, and its frequency analysis, as a base for a more objective analysis of the cardiotocographic (CTG) tracings. FHR signals are unevenly sampled series. To obtain evenly sampled series, cardiotocographs often use zero-order interpolation. Such process is simple and fast but results unsuitable for frequency analyses because it introduces alterations in the FHR power spectrum. An algorithm for the recovery of the true FHR series out of the zero-order interpolated CTG data was developed and evaluated.     

Release phenomena of insulin from an implantable device composed of a polyion complex of chitosan and sodium hyaluronate

An implant controlled-release system for protein drug delivery based on a polyion complex device composed of chitosan (CS) and sodium hyaluronate (HA) was investigated. The conditions which generated the greatest amount of the polyion solid complex were studied to ascertain the formation of polyion complex between CS and HA. The greatest amount of the polyion complex was formed at the weight ratio of 3 to 7 (CS:HA) at pH 3.5. Furthermore, the CS–HA pellets were prepared and then drug release from CS–HA pellets was evaluated using insulin as a model drug. The results demonstrated that the insulin release from CS–HA pellets was markedly influenced by both the change in the polymer mixing ratio and the total pellet weight, whereas the compression pressure did not affect the release significantly. An artificial neural network (ANN) and biharmonic spline interpolation (HSI) were employed to predict the actual relation between causal factors and the release rate constant of insulin. Although both the ANN and HSI successfully represented a non-linear relationship between the formulation factors and the release rate constant, HSI methodology gave a better estimation than that of the ANN.     

普通克立格法预测江宁县江滩钉螺分布

目的　探讨江宁县江滩钉螺孳生分布的预测方法。　方法　以变异函数分析江宁县江滩钉螺分布的空间自相关性,并以此为基础用普通克立格法 (OrdinaryKriging)预测江宁县江滩钉螺的分布。　结果　 2000年江宁县江滩钉螺分布呈空间自相关性,其变异函数为球型模型,且当距离小于0.0301时,钉螺空间分布变异与距离有关。进一步以此为基础用普通克立格法建立了江宁县江滩钉螺分布预测图,交叉核验显示预测图是对江滩钉螺分布最优无偏估计,预测模型的决定系数R2=0.973。　结论　普通克立格法能有效利用监测资料预测江宁县江滩钉螺的分布状况。     

基于光电容积脉搏波的呼吸信号提取及其系统的研制

血氧饱和度和呼吸信号是人体重要的生理信号,呼吸的监测在临床以及生活中具有重要的意义.该研究建立了一套从光电容积脉搏波中提取呼吸信号的系统.包括脉搏波信号的采集、呼吸信号的提取以及从下位机中实时传输至上位机的呼吸率和脉率的计算.     

基于边界信息的医学图像三维插值

目的Cubic卷积插值是医学图像三维插值的常用方法,针对其插值处的结果边界模糊和精度不高的缺陷,建立一种精确度较高的插值方法。方法首先通过模糊对比度增强精确定位图像边界,再运用形态学运算确定出新插值图像边界,对于新插值图像边界点采用最佳匹配对应点插值;对于非边界点采用一种新的Cubic卷积插值方法确定其灰度值。结果本文方法的均方差、不符合像素点数和最大误差均小于传统插值方法。结论本文提出的方法具有较高的精确性。     

运用Kriging 法对我国黄淮流域疟疾空间分布特征的研究

目的研究我国黄淮流域疟疾空间分布特征。方法收集安徽、河南及湖北省沿黄淮流域地区2005年有疟疾报告的156个市、县的当年发病率资料，利用Arcgis 9.0软件建立疟疾发病的地理信息系统，并在该软件的统计学扩展模块支持下，利用Kriging法对已建立的疟疾地理信息系统数据库进行空间插值分析，根据无偏最优的原则绘制疟疾发病概率的空间分布图，建立半变异函数，并对预测值的标准误差的分布制图。结果2005年黄淮地区疟疾发病分布呈空间自相关，自相关阈值98 928 m，其变异函数为球形模型，显示疟疾发病分布呈空间聚集性。交叉检验显示Krig-ing法生成的疟疾概率分布图是对黄淮地区疟疾空间分布的最优无偏估计，标准化均值为0.008 621。结论Kriging法能较好估计黄淮地区疟疾的空间分布特征，该地区的疟疾在空间分布上与距离有关，并呈现以安徽省中北部与河南交界及河南省与湖北省交界的两个明显的聚集中心，而且其空间分布并非与行政区划分类完全一致。