Test and evaluation of a moored microstructure recorder

A new moored microstructure recorder(MMR) is designed, developed, tested, and evaluated. The MMR directly measures the high-frequency shear of velocity fl uctuations, with which we can estimate the dissipation rate of turbulent kinetic energy. We summarize and discuss methods for estimating the turbulent kinetic energy dissipation rate. Instrument body vibrations contaminate the shear signal in an ocean fi eld experiment, and a compensating correction successfully removes this contamination. In both tank test and ocean fi eld experiment, the dissipation rate measured with the MMR agreed well with that measured using other instruments.

基于财经新闻的金融领域负面情感词典构建研究

金融领域的情感倾向具有其领域特有性,通用情感词典无法准确判断其情感倾向。本文以道琼斯工业平均指数排名前30的公司的实时新闻信息为研究对象,设置人工标注规则,采用多种机器学习算法对已标注数据集进行训练,使用特征选择算法抽取特征词语作为负面情感词语,从而构建金融领域负面情感词典。本文以McDonald Financial Dictionary(麦当劳金融词典)为目标情感词典,通过直接和间接评测两种方式验证其准确性。研究结果表明:本文通过实验获得金融领域603个负面的领域情感词,其领域负面情感词典的覆盖率为82.5%,且对金融领域新闻信息情感识别的准确率达到92.8%,能够显著提高金融领域负面情感倾向分析的准确率。