基于主题句相似度的标题党新闻鉴别技术研究

针对目前网络上的标题党新闻,提出一种标题党新闻自动识别的算法。通过分析新闻网页构成的特点,抽取出新闻标题和新闻正文;以句子关系矩阵为基础,提出一种以语句为单位的主题句抽取算法;根据句子相似度计算结果来进行判断。实验表明,本方法的识别精度可达到80%,是一种有效的方法。     

Three-dimensional cellular focusing utilizing a combination of insulator-based and metallic dielectrophoresis

Particle focusing in microfluidic devices is a necessary step in medical applications, such as detection, sorting, counting, and flow cytometry. This study proposes a microdevice that combines insulator-based and metal-electrode dielectrophoresis for the three-dimensional focusing of biological cells. Four insulating structures, which form an X pattern, are employed to confine the electric field in a conducting solution, thereby creating localized field minima in the microchannel. These electrodes, 56-μm-wide at the top and bottom surfaces, are connected to one electric pole of the power source. The electrodes connected to the opposite pole, which are at the sides of the microchannel, have one of three patterns: planar, dual-planar, or three-dimensional. Therefore, low-electric-field regions at the center of the microchannel are generated to restrain the viable HeLa cells with negative dielectrophoretic response. The array of insulating structures aforementioned is used to enhance the performance of confinement. According to numerical simulations, three-dimensional electrodes exhibit the best focusing performance, followed by dual-planar and planar electrodes. Experimental results reveal that increasing the strength of the applied electric field or decreasing the inlet flow rate significantly enhances focusing performance. The smallest width of focusing is 17 μm for an applied voltage and an inlet flow rate of 35 V and 0.5 μl/min, respectively. The effect of the inlet flow rate on focusing is insignificant for an applied voltage of 35 V. The proposed design retains the advantages of insulator-based dielectrophoresis with a relatively low required voltage. Additionally, complicated flow controls are unnecessary for the three-dimensional focusing of cells.     

Evaluation and simplification of risk factors in FIGO 2000 scoring system for gestational trophoblastic neoplasia: a 19-year retrospective analysis

Objective

The International Federation of Gynecology and Obstetrics (FIGO) 2000 scoring system classifies gestational trophoblastic neoplasia (GTN) patients into low- and high-risk groups, so that single- or multi-agent chemotherapy can be administered accordingly. However, a number of FIGO-defined low-risk patients still exhibit resistance to single-agent regimens, and the risk factors currently adopted in the FIGO scoring system possess inequable values for predicting single-agent chemoresistance. The purpose of this study is therefore to evaluate the efficacy of risk factors in predicting single-agent chemoresistance and explore the feasibility of simplifying the FIGO 2000 scoring system for GTN.

Methods

The clinical data of 578 GTN patients who received chemotherapy between January 2000 and December 2018 were retrospectively reviewed. Univariate and multivariate logistic regression analyses were carried out to identify risk factors associated with single-agent chemoresistance in low-risk GTN patients. Then, simplified models were built and compared with the original FIGO 2000 scoring system.

Results

Among the eight FIGO risk factors, the univariate and multivariate analyses identified that pretreatment serum human chorionic gonadotropin (hCG) level and interval from antecedent pregnancy were consistently independent predictors for both first-line and subsequent single-agent chemoresistance. The simplified model with two independent factors showed a better performance in predicting single-agent chemoresistance than the model with the other four non-independent factors. However, the addition of other co-factors did improve the efficiency. Overall, simplified models can achieve favorable performance, but the original FIGO 2000 prognostic system still features the highest discrimination.

Conclusions

Pretreatment serum hCG level and interval from antecedent pregnancy were independent predictors for both first-line and subsequent single-agent chemoresistance, and they had greater weight than other non-independent factors in predicting single-agent chemoresistance. The simplified model composed of certain selected factors is a promising alternative to the original FIGO 2000 prognostic system, and it shows comparable performance.

     

模糊层次分析法在电信客户满意度评价中的应用

随着经济的发展,客户的核心地位逐步显现出来。如何更好地提高客户的满意度,已成为当前商业界必须面临的问题。本文将三角模糊概念引入到层次分析法中用以确定各指标的权重,建立了客户满意度评价模型,实现了对客户满意度的评价。对商业实施有一定的指导作用。     

少年游泳运动员代谢能力的生化评定

通过对广东省少年儿童游泳运动员尿肌酐系数、血乳酸最高浓度和无氧阈游速的测定,评价他们的代谢能力。结果表明：一级运动员的无氧和有氧代谢能力均明显比二级运动员好,建议对低等级运动员在加强有氧耐力训练的基础上,优先发展磷酸原供能能力,并做好定期的评定监测工作,以便及时调整运动负荷和强度     

国内广电集团电视购物业务品牌建设比较分析

本文以品牌价值要素的构成为基本框架,主要从产品质量管理、客户关系管理和营销渠道建设三个方面,时国内几家主要广电媒体集团的电视购物业务品牌建设进行比较和分析,总结电视购物品牌建设的成功经验,并对国内广电媒体集团电视购物业务品牌建设提出一些建议.     

关于体育后备人才试点中学目标及管理若干问题的研究

一个国家要在竞技体育舞台上保持长盛不衰,就必须拥有一定数量的优秀体育后备人才,其关键是抓好课余运动训练。体育后备人才试点中学是学校体育改革的产物,它在抓好课余运动训练,培养高层次的体育后备人才中有其自身的优势和长处。本文在调查的基础上对体育后备人才试点中学的办学性质、培养目标、领导体制等问题作了研究、探讨。     

面向MIS对象设计与浏览对象设计实例

本文首先从对象和类的基本概念出发,论述了面向MIS对象设计的主要内容,指出MIS系统实质上是对象类系统的结论。然后,给出了一个对象类--浏览对象类的具体程序。     

1数学建模在供应链管理教学中的应用

近年来,供应链管理优化成为研究热点,但在本科教学中很少涉及。这是因为供应链管理优化方法往往涉及复杂的求解算法和编程技术,受教学时间和数学基础限制,普通本科生往往很难掌握。为此,本文提出在供应链管理教学中介绍数学建模技术,用数学模型表示供应链管理优化问题,再用商业软件求解,可以减少学习难度,提高学生的操作能力。本文介绍了供应链管理中涉及数学建模的教学内容,然后以生产批量优化模型为例,说明这一教学方式的应用。