期刊论文

No-chirped linearly tuning technique for fiber Bragg grating with a cantilever beam

Yu, Youlong

中文

光学学报

Guangxue Xuebao/Acta Optica Sinica

0253-2239

1999

19

7

873-876

10.3321/j.issn:0253-2239.1999.07.002

国家自然科学基金,国家攀登计划预研项目

本校为其他机构

基于依存句法“动词配价”原理与组块的概念,提出以情感依存元组(EDT)作为中文情感表达的基本单位。它以句中能承栽情感的几类实词作为中心词,修饰词依附于中心词,程度词和否定词依附于中心词和修饰词。该文对句子进行句法分析,在句法树和依赖关系中按规则提取情感依存元组,建立简单句情感依存元组判别模型计算情感倾向性。针对COAE2014评测公布的网络新闻语料,将该方法分别与有监督分类算法(KNN、SVM)和半监督算法(K-means)进行实验对比。结果表明,基于EDT的情感分类性能与有监督的机器学习算法相当,远高于半监督的聚类算法。

A kind of uniform density and thickness isosceles triangle cantilever beam was designed to realize linear tuning of Bragg wavelength of fiber grating without chirping by adjusting the deflection of the free end that is the vertex part of the triangle. The tuning was demonstrated experimentally within the range of 4.5 nm. After introducing a correction index of 0.71, the experimental results agree with the theoretical values. The form of reflected spectrum is rel...