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粒子群优化算法在电力工程三维数据聚类分析中的应用 被引量:7
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作者 伍家耀 周鲲 +1 位作者 徐志强 刘立洪 《电子设计工程》 2021年第6期24-28,共5页
电力工程的三维评审系统中涉及大量的数据,对于各类大数据的分类与处理是系统实现三维设计以及精准、高效运行的基础。针对现有数据分析方法难以解决干扰噪声出现、数据拟合精度不足的问题,文中结合K-means等现有聚类分析算法,在电力工... 电力工程的三维评审系统中涉及大量的数据,对于各类大数据的分类与处理是系统实现三维设计以及精准、高效运行的基础。针对现有数据分析方法难以解决干扰噪声出现、数据拟合精度不足的问题,文中结合K-means等现有聚类分析算法,在电力工程三维数据的聚类分析模型基础上,提出了一种基于粒子群优化算法的三维数据处理新方法。对含"噪声"曲线数据进行平滑处理来拟合获取电力工程三维数据;借助粒子群较强的全局搜索能力与更可靠的优化计算对三维数据进行分析,实现三维立体数据的自动识别。基于IEEE 14节点系统模拟电力传输网络进行仿真验证。结果表明,将该算法用于三维数据分析具有良好的有效性和优越性。 展开更多
关键词 电力工程 三维评审 粒子群 优化计算
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Three-dimensional endoanal ultrasonographic assessment of an anal fistula with and without H_2O_2 enhancement 被引量:25
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作者 Yung Kim Young Jin Park 《World Journal of Gastroenterology》 SCIE CAS CSCD 2009年第38期4810-4815,共6页
AIM: To evaluate the effectiveness of three-dimensional endoanal ultrasound (3D-EAUS) in the assessment of anal fistulae with and without H202 enhancement. METHODS: Sixty-one patients (37 males, aged 17-74 years... AIM: To evaluate the effectiveness of three-dimensional endoanal ultrasound (3D-EAUS) in the assessment of anal fistulae with and without H202 enhancement. METHODS: Sixty-one patients (37 males, aged 17-74 years) with anal fistulae, which were not simple low types, were evaluated by physical examination and 3D-EAUS with and without enhancement. Fistula classification was determined with each modality and compared to operative findings as the reference standard. RESULTS: The accuracy of 3D-EAUS was significantly higher than that of physical examination in detecting the primary tract (84.4% vs 68.7%, P = 0.037) and secondary extension (81.8% vs 62.1%, P = 0.01) and localizing the internal opening (84.2% vs 59.7%, P = 0.004). A contrast study with H202 detected several more fistula components including two primary suprasphincteric fistula tracks and one supralevator secondary extension, which were not detected on non-contrast study. However, there was no significant difference in accuracy between 3D-EAUS and H202- enhanced 3D-EAUS with respect to classification of the primary tract (84.4% vs 89.1%, P = 0.435) or secondary extension (81.8% vs 86.4%, P = 0.435) or localization of the internal opening (84.2% vs 89.5%, P = 0.406). CONCLUSION: 3D-EAUS was highly reliable in the diagnosis of an anal fistula. H2O2 enhancement was helpful at times and selective use in difficult cases may be economical and reliable. 展开更多
关键词 Anal fistula Endoanal ultrasound H2O2enhancement
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