鼻咽癌筛查成本效果的初步分析

目的:评价鼻咽癌新筛查方案的成本和效果。方法:在鼻咽癌高发区中山市进行鼻咽癌筛查,统计癌检出率、早诊率、人均筛查成本、发现早期病例平均费用和早期发现成本系数等指标。结果:共筛查16 712人,确诊鼻咽癌25例,检出率149.59/10万,早诊率76.0%,治疗率100.0%。筛查成本41.56元/人,发现病例费用27 779.82元,发现早期病例费用36 552.40元,按我国人均GDP计算,早期发现成本系数(EDCI)为1.71,按中山市人均GDP计算,EDCI为0.65。结论:相对常见恶性肿瘤鼻咽癌筛查成本较高,但在高发区筛查可以显著提高早诊率,并降低治疗费用

Improving efficiency with orthogonal exploration for online robotic assembly parameter optimization

In this paper, an online robotic assembly parameter optimization method is developed, this method make industrial robots can assemble workpiece from unskilled to skilled just like human's learning behavior. With the development of the force sensor technology and force control technology, the industrial robots are used in high precision assembly tasks which are more complicated. In order to ensure the efficiency and success rate of assembly, it is necessary to select the appropriate assembly parameters, this problem is called robotic assembly parameters optimization. The traditional solutions are used by artificial methods, a lot of experiments are carried out to get the optimal parameters, which are very time-consuming and laborious. Especially when the production line changes, using the traditional solutions have to do heavy experiments again, it can't meet the requirements of today's flexible manufacturing requirements. This paper presents an online robotic assembly parameter optimization method, which is called Gaussian Process Regression surrogated Bayesian Optimization Algorithm based on the Orthogonal Exploration (OE-GPRBOA), this method can liberate the labor, does not require artificial participation. The algorithm can optimize the parameters autonomously, finally find the optimal parameters for robotic assembly. For GPR is suitable for processing high dimension, small size of sample and nonlinear complex regression problems, the proposed OE-GPRBOA method can be used for various assembly tasks. In this paper, peg-in-hole assembly experiments are performed. The proposed method also compared with design of experiments (DOE) method and GPRBOA method. Experimental results show that, the proposed OE-GPRBOA method has more efficiency to find the optimal assembly parameters, this method can generate big economic impact

EFFECTS OF SOIL DRY-WET CHANGES AND AQUASORB TREATMENT ON PLANT GROWTH AND WATER USE EFFICIENCY

在盆栽玉米、大豆和辣椒的生长阶段进行高水分 (土壤田间持水量FC 10 0 %～ 80 % )、中水分 (FC 70 %～5 5 % )、低水分 (FC 5 0 %～ 40 % )处理 ,后复水至充分供水 .分析 3种植物在干湿变化中的生长和水分利用效应 ,比较土壤施用保水剂的效果 .结果发现 ,水分处理期间 3种植物生长变化与水分供给紧密相关 ,单株干重均表现为 :m (高水分 ) >m(中水分 ) >m(低水分 ) .但水分利用效率 (WUE)效应不一 ,中水分处理下玉米和大豆WUE为 2 0 .2gkg-1和3 .70gkg-1,分别比高水分处理还高 5 9.1%和 2 9.7% .水分处理又复水后 15d ,玉米在中水分处理复水的单株干重增加 39.6 3g ,是一直充分供水处理的 175 .0 % ,WUE达到 13 .3gkg-1,呈现超补偿生长效应和水分利用效率效应 .辣椒在中水分处理后复水 ,其青椒产量较高水分处理增加 6 % ,呈现产量补偿效应 .土壤加入保水剂可明显提高作物在低土壤水分条件下WUE .图 4表 1参 1

非洲生态系统监测、研究和管理能力评估

通过对比分析全球主要生态系统研究网络,评估非洲生态系统研究和监测能力及差距,提出构建非洲生态系统监测网络的框架与方案,形成洲际生态系统评估方法及监测网络布局设计;并通过建立典型监测站,作为非洲生态系统监测网的示范和培训基地,为非洲提供一个生态系统管理的示范,为提升非洲乃至全球应对气候变化的能力提供支持

A multi-parameter overall identification method used for industrial robot force signal processing

For industrial robot force signal measurement, we proposed a multi-parameter overall identification method, the results of identification used to compensate six-axis force/torque sensor sampling data, can greatly improve the measurement accuracy of contact force between robot end-effector and the environment. The parameters need to be identified comprise a deflection angle between the sensor coordinate system and the robot sixth axis coordinate system, the gravity of end-effector, the center of gravity of robot end-effector, the zero drift of sensor, a total of 11 parameters. The core idea of the parameters identification is that, firstly, building a parameter identification model about the parameters need to be identified, the robot posture, and the force measured by the sensor; Then, restructuring the parameters as unknown vector; Finally, using the least squares method to calculate the unknown vector which is the result of parameters. This method has two advantages: first, it overall consider a variety of factors, improve the measurement accuracy of the contact force; Second, it can overall identify all parameters, improve the identification efficiency. The theoretical analysis and experimental verification proved the correctness and validity of the method