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探地雷达瞬态晚时响应开始时刻的估计方法
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作者 朱彦龙 欧阳缮 周丽军 《信号处理》 CSCD 北大核心 2016年第1期98-104,共7页
为深入分析时域瞬态响应蕴含的目标特征信息,瞬态晚时响应开始时刻的估计成为近年来研究的热点。本文针对实际应用中一定条件下的浅埋目标体,从理论上推导了不同极化下,探地雷达早时响应中表面反射波的能量是相等的,以此确定加窗时刻的... 为深入分析时域瞬态响应蕴含的目标特征信息,瞬态晚时响应开始时刻的估计成为近年来研究的热点。本文针对实际应用中一定条件下的浅埋目标体,从理论上推导了不同极化下,探地雷达早时响应中表面反射波的能量是相等的,以此确定加窗时刻的起始点;进而利用晚时响应中蕴含的极点收敛性,采用矩阵束方法进行极点估计,确定收敛最早的时刻为晚时响应阶段的开始点。以干沙环境下细长圆柱体的瞬态响应为例,数值仿真与实验结果表明,该方法能有效的分离出瞬态晚时响应。 展开更多
关键词 探地雷达 响应 晚时响应 极化 极点收敛
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基于极化的浅埋目标体时域瞬态响应处理方法
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作者 朱彦龙 欧阳缮 《桂林电子科技大学学报》 2015年第4期280-283,共4页
为了获取瞬态响应蕴含的目标特征信息,提出一种基于极化的时域瞬态响应的处理方法。以早时响应中表面反射波能量相等为基础,计算加窗后各个数据窗下的最大奇异值,确定最大奇异值下降速率骤降时刻为晚时响应阶段的开始点。仿真结果表明,... 为了获取瞬态响应蕴含的目标特征信息,提出一种基于极化的时域瞬态响应的处理方法。以早时响应中表面反射波能量相等为基础,计算加窗后各个数据窗下的最大奇异值,确定最大奇异值下降速率骤降时刻为晚时响应阶段的开始点。仿真结果表明,本方法能够实现对早时响应与晚时响应的分离。 展开更多
关键词 探地雷达 响应 晚时响应 极化 奇异值
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Comparison of two different kinds of regimens in treatment of advanced non-small cell lung cancer
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作者 Wenwu Wang Xuenong Ouyang 《The Chinese-German Journal of Clinical Oncology》 CAS 2011年第10期563-566,共4页
Objective: The aim of this study was to analyze and compare the recent efficacy and toxicity of a three-drug platinum-based regimen (A regimen): [cisplatin (DDP) + gemcitabine (GEM) + vinorelbine (NVB)] an... Objective: The aim of this study was to analyze and compare the recent efficacy and toxicity of a three-drug platinum-based regimen (A regimen): [cisplatin (DDP) + gemcitabine (GEM) + vinorelbine (NVB)] and a two-drug combination without a platinum drug (B regimen): GEM + NVB, which were used to treat 55 advanced non-small cell lung cancer (NSCLC) patients, in a bid to provide a guidance for clinical treatment. Methods: Twenty-four cases of advanced NSCLC (stage Ill-IV) patients were treated with A regimen (DDP 35 mg/m^2 d1-3; GEM 1250 mg/m^2 d1, 8 ). The other 31 cases were treated with B (GEM 1250 mg/m^2 d1,8; NVB 25 mg/m^2 d1, 8 ). Repeat every 3 weeks for 6 courses. Results: In A regimen group, the overall response rate was 45.8% (CR + PR = 11), median response time was 5.5 months, median survival time was 11 months and 1-year survival rate was 41.7%. In B regimen group, the overall response rate was 48.4% (CR + PR = 15) and median response time, survival time and 1-year survival rate were respectively 6.5 and 10 months and 41.9%. The major toxicities were nausea/vomiting, myelosuppression in A regimen group, myelosuppression and phlebitis in B regimen group, respectively. Conclusion: A regimen and B regimen for advanced NSCLC have similar response rate (P 〉 0.05). B regimen, a two-drug combination without a platinum drug is of less toxicity and more safety than A regimen, a three-drug platinum-based regimen and is recommended to be a regimen in the first-line treatment for advanced NSCLC. 展开更多
关键词 non-small cell lung cancer (NSCLC) gemcitabine (GEM) vinorelbine (NVB) cisplatin (DDP) combined chemotherapy
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