研究了基于IEC 61970公共信息模型(common information model,CIM)的全景视图、厂站接线图自动生成技术。基于动态图模映射自动关联、最小面积椭圆地理分区算法、厂站布局的释放-压缩算法,在南方电网调度控制中心实现了南方电网110 k V...研究了基于IEC 61970公共信息模型(common information model,CIM)的全景视图、厂站接线图自动生成技术。基于动态图模映射自动关联、最小面积椭圆地理分区算法、厂站布局的释放-压缩算法,在南方电网调度控制中心实现了南方电网110 k V及以上电压等级电网模型的全景拼接基础上自动成图、厂站接线图自动布局成图、地理潮流图自动生成、模型图形的同步更新,并成功应用到EMS等系统,达到了电力系统全景画面集成,提高了电网运行维护效率,为调控中心提供了更为准确、可靠和丰富的电网图形和可视化支持。展开更多
回归测试用例选择(Regression Test Case Selection,RTS)问题是回归测试研究中的一个热点,旨在从已有测试用例集中选择出所有可检测代码修改的测试用例。但迄今为止,国内研究人员并未对RTS问题的已有研究成果进行系统总结和比较。首先...回归测试用例选择(Regression Test Case Selection,RTS)问题是回归测试研究中的一个热点,旨在从已有测试用例集中选择出所有可检测代码修改的测试用例。但迄今为止,国内研究人员并未对RTS问题的已有研究成果进行系统总结和比较。首先在回归测试活动和测试用例划分基础上,引出RTS问题和相关假设。随后从源代码和模型角度对已有RTS技术进行分类,从源代码角度出发,又进一步将其细分为线性规划法、数据流分析法、图遍历法、程序切片法和防火墙法等。接着对常见评测数据集和评测指标进行总结,最后对该问题的未来研究方向进行了展望。展开更多
In order to establish a new method for measuring the dimensions of coarse aggregates, five different-size flat and elongated (F&E) coarse aggregates were glued into two specimens by epoxy resin, respectively, and ...In order to establish a new method for measuring the dimensions of coarse aggregates, five different-size flat and elongated (F&E) coarse aggregates were glued into two specimens by epoxy resin, respectively, and slice images were obtained by X-ray CT, then the aggregates were extracted by the fuzzy c-means clustering algorithm. Attributions of the particle on different cross-sections were determined by the ‘overlap area method’. And unified three-dimensional Cartesian coordinate system was established based on continuous slice images. The coefficient values of spherical harmonics descriptor representing particles surface profile were gained, then each scanned particle was represented by 60×120 discrete points conformably with spherical harmonics descriptor. The chord length and direction angles were determined by the calculation. With the major axis (L) and orthogonal axis (W and T), the calculated results were compared with those measured by caliper. It is concluded that the new L, W, and T dimension measuring method is able to take the place of the present manual measurement.展开更多
文摘研究了基于IEC 61970公共信息模型(common information model,CIM)的全景视图、厂站接线图自动生成技术。基于动态图模映射自动关联、最小面积椭圆地理分区算法、厂站布局的释放-压缩算法,在南方电网调度控制中心实现了南方电网110 k V及以上电压等级电网模型的全景拼接基础上自动成图、厂站接线图自动布局成图、地理潮流图自动生成、模型图形的同步更新,并成功应用到EMS等系统,达到了电力系统全景画面集成,提高了电网运行维护效率,为调控中心提供了更为准确、可靠和丰富的电网图形和可视化支持。
文摘回归测试用例选择(Regression Test Case Selection,RTS)问题是回归测试研究中的一个热点,旨在从已有测试用例集中选择出所有可检测代码修改的测试用例。但迄今为止,国内研究人员并未对RTS问题的已有研究成果进行系统总结和比较。首先在回归测试活动和测试用例划分基础上,引出RTS问题和相关假设。随后从源代码和模型角度对已有RTS技术进行分类,从源代码角度出发,又进一步将其细分为线性规划法、数据流分析法、图遍历法、程序切片法和防火墙法等。接着对常见评测数据集和评测指标进行总结,最后对该问题的未来研究方向进行了展望。
基金Project(51038004) supported by the National Natural Science Foundation of ChinaProject(2009318000078) supported by the Western China Communications Construction and Technology Program, China
文摘In order to establish a new method for measuring the dimensions of coarse aggregates, five different-size flat and elongated (F&E) coarse aggregates were glued into two specimens by epoxy resin, respectively, and slice images were obtained by X-ray CT, then the aggregates were extracted by the fuzzy c-means clustering algorithm. Attributions of the particle on different cross-sections were determined by the ‘overlap area method’. And unified three-dimensional Cartesian coordinate system was established based on continuous slice images. The coefficient values of spherical harmonics descriptor representing particles surface profile were gained, then each scanned particle was represented by 60×120 discrete points conformably with spherical harmonics descriptor. The chord length and direction angles were determined by the calculation. With the major axis (L) and orthogonal axis (W and T), the calculated results were compared with those measured by caliper. It is concluded that the new L, W, and T dimension measuring method is able to take the place of the present manual measurement.
