领域本体驱动的招投标网页解析方法

针对正则表达式解析招投标网页效率低下的问题,提出了一种基于招投标领域本体的网页自动化解析新方法。首先,分析了招投标网页文本的结构特征;其次,构建了招投标本体的轻量级领域知识模型;最后,给出一种招投标网页元素语义匹配与抽取算法,实现招投标网页的自动化解析。实验结果表明,新方法通过自适应的解析,准确率、召回率分别可达到95.33%、88.29%,与正则表达式方法相比,分别提高了3.98个百分点和3.81个百分点。所提方法可实现自适应地对招投标网页中语义信息的结构化解析抽取,能够较好地满足实用性能要求。

Analytical Derivations of Single-Particle Matrix Elements in Nuclear Shell Model

We present analytical method to calculate single particle matrix elements used in atomic and nuclear physics. We show seven different formulas of matrix elements of the operator f(r)d_r^m where f(r) = r~μ, r~μjJ(qr), V(r)corresponding to the Gaussian and the Yukawa potentials used in nuclear shell models and nuclear structure. In addition,we take into account a general integral formula of the matrix element 〈 n′ l′|f(r) d_r^(m) |n l〉 that covers all seven matrix elements obtained analytically.