Adaptive Order Polynomial Fitting for Pulmonary Nodule Segmentation in Chest Radiograph

Segmentation of pulmonary nodules in chest radiographs is a particularly challenging task due to heavy noise and superposition of fibs, vessels, and other complicated anatomical structures in lung field. In this paper, an adaptive order polynomial fitting based ray- casting algorithm is proposed for pulmonary nodule segmentation in chest radiographs. Instead of detecting nodule edge points directly, the nodule intensity proffies are first fitted by using the polynomials with adaptively determined orders. Then, the edge positions are identified through analyzing the local minimum of the fitted curves. The performance of the proposed algorithm was evaluated over an image database with 148 nodule cases in chest radiographs that were collected from a variety of digital radiograph modalities. The preliminary results show the proposed algorithm can obtain a high rate of successful segmentations.     

基于方向链码的书空手势识别

介绍了Leapmotion交互设备的结构及运行机制,在该设备产生的交互空间中的x-y平面上定义8个方向的方向链码,通过该设备检测手指在空间中的位置变化,确定手指的移动方向,并结合方向链码定义动态书空手势。为了消除手指在空间运动的不稳定性而导致的噪声干扰,将手指在平面上的位置信息映射到计算机屏幕上显示出手指的移动轨迹,对轨迹进行分段处理,根据分段的比重提取主要移动方向描述输入手势,采用顺序匹配算法对输入手势与模板手势进行匹配,识别输入的书空手势。     

基于分数阶微分梯度的噪声检测算法

为了在图像去噪的同时,更多地保留图像原有的特征信息,本文将分数阶积分理论引入到数字图像去噪中,通过分数阶微分梯度算法确定图像中噪声的位置,如果只对噪声点进行去噪处理,就可以有效保护图像的纹理和边缘信息.实验结果表明,基于分数阶微分梯度的噪声检测算法可以更准确地确定图像中噪声点像素的位置.     

一类分数阶微分方程积分边值问题正解的存在性

In this paper,we concern ourselves with the existence of positive solutions for a type of integral boundary value problem of fractional differential equations with the fractional order linear derivative operator. By using the fixed point theorem in cone,the existence of positive solutions for the boundary value problem is obtained. Some examples are also presented to illustrate the application of our main results.     

关于三阶可微函数的若干加权积分不等式

通过建立与三阶可微函数有关的恒等式,在三阶导函数绝对值的幂为s-凸函数或s-凹函数的情形下,给出了若干新的加权Hermite-Hadamard型不等式。在三阶导函数有界的情形下,给出了一个严格的不等式。当权函数恒为1时,由本文的结果得到有关文献的结果。     

一类基于p~6阶二十七家族群的推广

对p6阶二十七家族群中定义关系进行推广,利用群的扩张理论与自由群理论分别证明了扩张后的群的存在性与定义关系的准确性,得到了一系列新的p-群,并给出了它们的一些性质。     

一类一阶拟线性双曲型方程组的精确边界能控性

考虑了由3个方程组成的一阶拟线性对角型方程组.在边界条件中对角变量没有任何耦合关系的情况下,通过建立一类二阶拟线性双曲型方程组的局部精确边界能控性,得到了该类方程组的单侧精确边界能控性以及具有较少控制的双侧精确边界能控性.     

自同构群阶为16pq的有限群

设G是有限群,m是正整数,关于自同构方程｜Aut（G）｜=m的求解是一个难题．此课题的系统研究始于上世纪70年代末．目前已经取得了一系列的结果．在过去研究的基础上讨论群方程｜Aut（G）｜=16pq的求解问题,找出了所有满足条件的有限幂零群．     

2011年天津市技术市场统计分析

对天津市科学技术交易市场交易的情况进行统计并分析研究,2002—2011年我市技术交易项数和成交总额均呈逐年增长的趋势;单个项目成交额从2002年的52.74万元增长到2009年的146.33万元;2006—2011年技术合同成交额占全市GDP比重均高于全国平均水平;企业是我市技术交易市场的绝对主体,占全市技术交易总额的83.89%,其中科技型中小企业占全市技术交易总额的61.52%。     

Multi-criteria assessment of offshore wind turbine support structures based on dynamic property optimization

Increasing size of wind turbine and deep water deployment have raised the issue of appropriate selection of the most suitable support structure to make offshore wind energy cost competitive.The paper presents an optimization methodology for decision making process of bottom mounted supports of offshore wind turbines （OWTs） through reasonable engineering attributes derivation.Mathematic models of support structures are reduced by the generalized single-degree-of-freedom theory with relatively fewer structural parameters.Soft-stiff design optimization based on dynamic properties of OWTs is performed for monopile and lattice supports with different wind turbines,water depth and hub height.Attributes of support structures,wind turbines and environment conditions are applied in the multi-criteria decision making method——TOPSIS for benchmarking of those options.The results illustrate the effectiveness of the proposed optimazation methodology combined with economical and environmental attributes together.