With the extensive application of Web technology,it becomes more and more critical of the request to thequality and reliability of Web applications. Then it is crucial to test Web applications automaticly,entirely and...With the extensive application of Web technology,it becomes more and more critical of the request to thequality and reliability of Web applications. Then it is crucial to test Web applications automaticly,entirely and thor-oughly. So we make a study of some Web testing methods and technologies. First,we discuss the necessity of Webtesting,then analyze where the faults may take place based on the architecture of the Web ,next discuss various meth-ods of Web testing in details. Then,based on the ideology of Object-Oriented,we build a model for Web testing,anddiscuss the method of doing some pertinence testing on pages when we utilize the information of statistic. At last,weintroduce some tools for white-box testing.展开更多
海杂波背景下的海上小目标是海洋雷达探测的重难点。针对特征空间内海杂波与小目标特征可分性问题,提出了量化特征之间可分性的度量标准——重叠系数。通过开展对海探测试验获取的2~5级海况实测数据,分别提取时域特征相对平均幅度(Relat...海杂波背景下的海上小目标是海洋雷达探测的重难点。针对特征空间内海杂波与小目标特征可分性问题,提出了量化特征之间可分性的度量标准——重叠系数。通过开展对海探测试验获取的2~5级海况实测数据,分别提取时域特征相对平均幅度(Relative Average Amplitude,RAA)、相对峰值峰高(Relative Peak Height,RPH)、时域熵值均值(Time domain Entropy Mean,TEM),频域特征相对多普勒峰高(Relative Doppler Peak Height,RDPH)、相对多普勒向量熵(Relative Vector Entropy,RVE)、频域熵值二阶矩(Second moment of Frequency domain Entropy,SOFE),计算出重叠系数。通过特征检测器进行检测性能对比,低海况下,相对平均幅度、相对峰值峰高、时域熵值均值、相对多普勒峰高、频域熵值二阶矩特征之间重叠系数均在0.3以下,对应特征检测器的检测概率均在85%以上;高海况下其特征之间重叠系数均在0.7以上,对应特征检测器的检测概率均在50%以下。相对多普勒向量熵在4种海况下可分性较小,其对应的特征检测器性能较差。结果验证了重叠系数在一维特征选择的应用可行性,为多特征融合目标检测提供了一定支持。展开更多
文摘With the extensive application of Web technology,it becomes more and more critical of the request to thequality and reliability of Web applications. Then it is crucial to test Web applications automaticly,entirely and thor-oughly. So we make a study of some Web testing methods and technologies. First,we discuss the necessity of Webtesting,then analyze where the faults may take place based on the architecture of the Web ,next discuss various meth-ods of Web testing in details. Then,based on the ideology of Object-Oriented,we build a model for Web testing,anddiscuss the method of doing some pertinence testing on pages when we utilize the information of statistic. At last,weintroduce some tools for white-box testing.
文摘海杂波背景下的海上小目标是海洋雷达探测的重难点。针对特征空间内海杂波与小目标特征可分性问题,提出了量化特征之间可分性的度量标准——重叠系数。通过开展对海探测试验获取的2~5级海况实测数据,分别提取时域特征相对平均幅度(Relative Average Amplitude,RAA)、相对峰值峰高(Relative Peak Height,RPH)、时域熵值均值(Time domain Entropy Mean,TEM),频域特征相对多普勒峰高(Relative Doppler Peak Height,RDPH)、相对多普勒向量熵(Relative Vector Entropy,RVE)、频域熵值二阶矩(Second moment of Frequency domain Entropy,SOFE),计算出重叠系数。通过特征检测器进行检测性能对比,低海况下,相对平均幅度、相对峰值峰高、时域熵值均值、相对多普勒峰高、频域熵值二阶矩特征之间重叠系数均在0.3以下,对应特征检测器的检测概率均在85%以上;高海况下其特征之间重叠系数均在0.7以上,对应特征检测器的检测概率均在50%以下。相对多普勒向量熵在4种海况下可分性较小,其对应的特征检测器性能较差。结果验证了重叠系数在一维特征选择的应用可行性,为多特征融合目标检测提供了一定支持。
