Classification decision tree algorithm assisting in diagnosing solitary pulmonary nodule by SPECT/CT fusion imaging

Objective To develop a classification tree algorithm to improve diagnostic performances of 99mTc-MIBI SPECT/CT fusion imaging in differentiating solitary pulmonary nodules (SPNs). Methods Forty-four SPNs, including 30 malignant cases and 14 benign ones that were eventually pathologically identified, were included in this prospective study. All patients received 99Tcm-MIBI SPECT/CT scanning at an early stage and a delayed stage before operation. Thirty predictor variables, including 11 clinical variables, 4 variables of emission and 15 variables of transmission information from SPECT/CT scanning, were analyzed independently by the classification tree algorithm and radiological residents. Diagnostic rules were demonstrated in tree-topology, and diagnostic performances were compared with Area under Curve (AUC) of Receiver Operating Characteristic Curve (ROC). Results A classification decision tree with lowest relative cost of 0.340 was developed for 99Tcm-MIBI SPECT/CT scanning in which the value of Target/Normal region of 99Tcm-MIBI uptake in the delayed stage and in the early stage, age, cough and specula sign were five most important contributors. The sensitivity and specificity were 93.33% and 78. 57e, respectively, a little higher than those of the expert. The sensitivity and specificity by residents of Grade one were 76.67% and 28.57%, respectively, and AUC of CART and expert was 0.886±0.055 and 0.829±0.062, respectively, and the corresponding AUC of residents was 0.566±0.092. Comparisons of AUCs suggest that performance of CART was similar to that of expert (P=0.204), but greater than that of residents (P<0.001). Conclusion Our data mining technique using classification decision tree has a much higher accuracy than residents. It suggests that the application of this algorithm will significantly improve the diagnostic performance of residents.     

Dynamic response analysis of towed cable during deployment/retrieval

A numerical approach was developed to analyze the transient behavior of towed cable during ac- tively controlled deployment/retrieval (DR). The cable motion is described by the lumped parameter method, its corresponding boundary conditions are presented. In view of its varying length during DR, two auxiliary arguments are introduced to describe its continuous varying length and discrete number of nodes(equations), the length is determined by the pay out(or reel-in) rate, which is then used to determine the node number by a logic relation. For the discrete mathematical model of towed cable, an algorithm was developed to deal with the discrete governing equations. The simulation results indicate that the cable experiences more com- plex motions due to its varying length, and tension fluctuates seriously in the startup and ending stage of deployment/retrieval. The effect of towing ship's motion in waves on cable during deployment/retrieval is also considered via numerical simulation.     

三维声呐成像系统在防波堤水下安装块石中的运用

防波堤工程水下块石安装的效率及安全是工程中至关重要的部分,而传统的安装方法和检测手段存在严重不足。三维实时声呐成像系统有效克服了传统方法的弊端,具有实时、高效、清晰、保证人员安全的优势。并且能够在水下能见度极低、海况条件差等复杂条件下正常工作。以以色列阿什杜德港防波堤工程为例,总结利用水下三维声呐成像系统安装人工护坡块石所采取的技术与控制措施,具有较高的适用和推广价值。     

兰屿：让人上瘾的台湾小岛

在台湾诸多离岛中，兰屿一直给人偏远的印象，这也为兰屿岛蒙上了一层神秘的面纱。     

易腾迈高性价比线性成像手持扫描器拓展条码扫描器系列产品

自动识别设备及解决方案领先供应商美国易腾迈公司（IntermecInc．纽约证券交易所代码：IN）目前宣布推出一款适用于中小型企业的简易可靠、高性价比的手持条码扫描器一SGIOT。该款全新SGIOT扫描器性能卓越，可以实现对准即拍，其采用固态成像技术轻松读取一维条码，是柜台基本扫描的最佳选择。     

港珠澳大桥建设紧张推进

2012-08以来,港珠澳大桥建设紧张推进,岛隧工程中海底沉管的第1管节完成浇筑,并拆去模板,即将"出厂"。08-05,首节沉管开始进行混凝土浇筑,2d后顺利完成浇筑;08-09,预制部分模板拆除;08-12完成体系转换工作,开始准备顶推,即利用4条轨道的24个千斤顶来支撑起9000t的沉管。8个同样的管节将组成一个整体并安置在海底。同时,岛隧工程人工岛、沉管出运专用坞等其他工程也在紧张有序推进。     

城市道路绿化评价方法研究

城市道路基础设施的建设，是社会经济发展的基础和动力。然而，公路建设项目必然会占用土地、破坏植被，影响自然地貌、自然景观以及建设区域内的文物遗迹、人文景观、自然水体、植物的生存环境等。这将给城市道路建设项目所在区域的景观资源和自然环境造成重大影响。     

沉睡在大洋深处的宝藏

海底有天然的金矿,海水中蕴含的金子成分早已经成为科学家们的共识。但是,在大洋深处还有无数的人造珍宝不为人所知,人类正千方百计地寻找它们的所在,时间老人正等待它们重见天日。     

群山中的公路改造

安康市古称"金州",南依大巴山北坡,北靠秦岭主脊,汉江由西向东横贯,构成了"两山夹一川(江)"的自然地貌.其境内的主要山脉有秦岭的东梁、平河梁、南羊山和大巴山的化龙山、凤凰山、笔架山,群山环抱下的安康市具有得天独厚的森林、峡谷、山区和溶洞等丰富的旅游资源.     

建设海底天然气高速公路

北溪天然气管道是一条经波罗的海连接俄罗斯和欧盟的天然气管道。该管道将为公司和个人家庭输送天然气。这条新管道是欧洲能源安全的一个重要因素。