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渭河关中段年径流过程变异点的诊断 被引量:8
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作者 拜存有 张升堂 《西北农林科技大学学报(自然科学版)》 CSCD 北大核心 2009年第10期215-220,共6页
【目的】利用滑动秩和检验法研究渭河流域径流过程的变异点位置及数目。【方法】针对水文过程变异的复杂性,采用初步判断、详细诊断和综合分析判定3个步骤,以详细诊断为核心,在分析比较目前各种变异点诊断方法的基础上,运用滑动秩和检验... 【目的】利用滑动秩和检验法研究渭河流域径流过程的变异点位置及数目。【方法】针对水文过程变异的复杂性,采用初步判断、详细诊断和综合分析判定3个步骤,以详细诊断为核心,在分析比较目前各种变异点诊断方法的基础上,运用滑动秩和检验法,对渭河流域关中段干流及主要支流林家村、魏家堡、咸阳、华县、景村和状头6个控制性水文站50年(1956~2005年)的径流序列进行详细诊断,再结合成因分析法进行综合判定,分析了各站径流过程比较显著的变异点数目与位置。【结果】经过三步分析诊断可知,渭河干流林家村、魏家堡、咸阳、华县4站均存在2个变异点,分别为1971和1994年,径流系列可以分为3段,即1956~1970,1971~1993和1994~2005年;景村和状头2个支流站均存在1个变异点,且均发生在1994年,径流系列可以分为2段,即1956~1993和1994~2005年。【结论】利用滑动秩和检验法诊断径流系列的变异点,方法简单可行、适应性强,而且检验结果的可靠度高,因而具有一定的推广价值,利用该方法对渭河流域6水文站的诊断结果符合实际情况。 展开更多
关键词 渭河流域 径流过程 滑动秩和检验法 变异点诊断
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Testability Estimation of Framework Based Applications
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作者 Noopur Goel Manjari Gupta 《Journal of Software Engineering and Applications》 2012年第11期841-849,共9页
Quality of software systems is highly demanded in today’s scenario. Highly testable system enhances the reliability also. More than 50% of test effort-time and cost are used to produce a highly testable system. Thus,... Quality of software systems is highly demanded in today’s scenario. Highly testable system enhances the reliability also. More than 50% of test effort-time and cost are used to produce a highly testable system. Thus, design-for-testability is needed to reduce the test effort. In order to enhance the quality, productivity and reduced cost of the software organizations are promoting to produce the reuse-oriented products. Incorporating reuse technology in both aspects-software development process and test process may payoff many folds. Keeping this view, our study focus the testability of the object-oriented framework based software systems and identify that flexibility at the variable points of the object-oriented framework, chosen for framework instantiation, greatly affects the testability of object-oriented framework based software at each level of testing. In the current paper, we propose a testability model considering the flexible aspect of the variable point to estimate testability in the early phase, requirement analysis phase, of development process of the framework based software. The proposed model helps to improve the testability of the software before the implementation starts thus reducing the overall development cost. 展开更多
关键词 Reuse-Technology variation-points OBJECT-ORIENTED FRAMEWORK BASED Software Basic test Cases FRAMEWORK Interface CLASSES Other Application CLASSES
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