A multidimensional segmentation evaluation for medical image data

Evaluation of segmentation methods is a crucial aspect in image processing, especially in the medical imaging field, where small differences between segmented regions in the anatomy can be of paramount importance. Usually, segmentation evaluation is based on a measure that depends on the number of segmented voxels inside and outside of some reference regions that are called gold standards. Although some other measures have been also used, in this work we propose a set of new similarity measures, based on different features, such as the location and intensity values of the misclassified voxels, and the connectivity and the boundaries of the segmented data. Using the multidimensional information provided by these measures, we propose a new evaluation method whose results are visualized applying a Principal Component Analysis of the data, obtaining a simplified graphical method to compare different segmentation results. We have carried out an intensive study using several classic segmentation methods applied to a set of MRI simulated data of the brain with several noise and RF inhomogeneity levels, and also to real data, showing that the new measures proposed here and the results that we have obtained from the multidimensional evaluation, improve the robustness of the evaluation and provides better understanding about the difference between segmentation methods.     

浅谈建筑工程施工成本的控制措施

结合多年建筑工程施工成本的控制经验，在分析建筑工程施工成本的组成与预测基础上，从人工、材料、设备、质量及合同、财务及其他成本等方面进行了建筑工程施工成本控制措施的论述，以期为建筑施工企业成本控制积累经验。     

Simulation based analysis and an application to an offshore oil and gas production system of the Natvig measures of component importance in repairable systems

In the present paper the Natvig measures of component importance for repairable systems, and its extended version are analyzed for two three-component systems and a bridge system. The measures are also applied to an offshore oil and gas production system. According to the extended version of the Natvig measure a component is important if both by failing it strongly reduces the expected system uptime and by being repaired it strongly reduces the expected system downtime. The results include a study of how different distributions affect the ranking of the components. All numerical results are computed using discrete event simulation. In a companion paper [Huseby AB, Eide KA, Isaksen SL, Natvig B, Gåsemyr, J. Advanced discrete event simulation methods with application to importance measure estimation. 2009, submitted for publication] the advanced simulation methods needed in these calculations are described.     

公路沥青路面裂缝的预防和处理

结合实践经验,就沥青路面裂缝的类型、形成原因及危害进行了论述,从设计、施工、材料等方面总结了沥青路面裂缝的预防和处理措施,并从施工角度提出了控制裂缝发生的有效方法,以期延长沥青路面使用寿命。     

走产业化道路,规范行业行为,迎接化学建材的新发展

回顾总结了我国塑料门窗及异型材发展过程、现状及发展中存在的问题 ,并提出相应的对策 ,同时阐述了行业协会在行业发展中的应用     

变革中的图书馆读者服务工作

网络时代标志着图书馆工作将进入一个全新的发展时期 ,变革与传统将同时存在。专业院校图书馆从读者服务工作的角度应就其发展趋势、自身存在的问题 ,及时采取应对措施     

电动三轮车发展现状调查及管理对策浅析

对电动三轮车的现状采用抽样调查的方法,分别从拥有数量、驾驶人员类型、驾驶用途、营运利润、行车速度以及电动车价格等方面进行了统计分析,并对电动三轮车发展的利弊进行了辩证的分析,且提出了相应的管理对策措施。     

建筑设计风险分析与管理

文章从分析建筑设计自身特点入手，分析了构成其风险的主要因素，并在此基础上提出了相应的管理措施。结论可供相关部门参考。     

回顾看涨幂期权的定价

根据风险中性定价原理,借助几何Brown运动击中双边障碍时刻的分布,给出了回顾看涨幂期权的定价公式.     

论水泥浆流动度试验方法及应用

论述了GB8077水泥浆流动度试验方法存在的问题及改善措施;外加剂质量控制中应用水泥浆流动度试验的注意事项;水泥浆流动度试验判断外加剂与水泥适应性的可行性及局限性.