Affected by the outbreak of COVID-2019,the international shipping market oscillated down,and the volume of new shipbuilding orders decreased significantly worldwide.China's shipbuilding completion and hand-held sh...Affected by the outbreak of COVID-2019,the international shipping market oscillated down,and the volume of new shipbuilding orders decreased significantly worldwide.China's shipbuilding completion and hand-held ship orders decreased year-on-year(YOY),and due to the lower base in the same period last year,China's new ship orders increased YOY.Major economic indicators such as the total industrial output value of key monitored enterprises declined YOY.展开更多
为科学评判船舶修船项目的优先级,解决资源冲突问题,提升修船企业的经济效益,采用文献研究法、头脑风暴法和德尔菲法建立项目优先级评价指标体系。从财务、客户、内部流程、学习成长和战略等5个维度确定目标层和17个指标的影响因素。通...为科学评判船舶修船项目的优先级,解决资源冲突问题,提升修船企业的经济效益,采用文献研究法、头脑风暴法和德尔菲法建立项目优先级评价指标体系。从财务、客户、内部流程、学习成长和战略等5个维度确定目标层和17个指标的影响因素。通过网络层次分析法(Analytic Network Process,ANP)获取指标权重,采用TOPSIS(Technique for Order Preference by Similarity to an Ideal Solution)法进行修船项目优先级排序。选取6个船舶修理项目进行实例分析,验证该方法的适用性。展开更多
针对短相干积累时间(coherent integration time,CIT)引起的多普勒分辨率低,无法从强大海杂波中检测出舰船目标的问题,提出了基于高阶奇异值分解(higher order singular value decomposition,HOSVD)的海杂波抑制算法。首先利用相邻单元...针对短相干积累时间(coherent integration time,CIT)引起的多普勒分辨率低,无法从强大海杂波中检测出舰船目标的问题,提出了基于高阶奇异值分解(higher order singular value decomposition,HOSVD)的海杂波抑制算法。首先利用相邻单元内海杂波的相干性,将毗邻距离单元和方位单元的多脉冲接收数据应用三阶张量表示,然后采用HOSVD方法求解三阶张量的海杂波子空间和目标子空间的投影矩阵,最后利用投影矩阵将三阶张量映射到目标子空间以抑制海杂波。该方法与现有子空间类海杂波抑制方法相比,提高了信干噪比(signal to clutter plus noise ratio,SCNR)和峰值旁瓣电平比(peak sidelobe level ratio,PSLR),解决了目标谱峰偏移问题。展开更多
文摘Affected by the outbreak of COVID-2019,the international shipping market oscillated down,and the volume of new shipbuilding orders decreased significantly worldwide.China's shipbuilding completion and hand-held ship orders decreased year-on-year(YOY),and due to the lower base in the same period last year,China's new ship orders increased YOY.Major economic indicators such as the total industrial output value of key monitored enterprises declined YOY.
文摘为科学评判船舶修船项目的优先级,解决资源冲突问题,提升修船企业的经济效益,采用文献研究法、头脑风暴法和德尔菲法建立项目优先级评价指标体系。从财务、客户、内部流程、学习成长和战略等5个维度确定目标层和17个指标的影响因素。通过网络层次分析法(Analytic Network Process,ANP)获取指标权重,采用TOPSIS(Technique for Order Preference by Similarity to an Ideal Solution)法进行修船项目优先级排序。选取6个船舶修理项目进行实例分析,验证该方法的适用性。
文摘针对短相干积累时间(coherent integration time,CIT)引起的多普勒分辨率低,无法从强大海杂波中检测出舰船目标的问题,提出了基于高阶奇异值分解(higher order singular value decomposition,HOSVD)的海杂波抑制算法。首先利用相邻单元内海杂波的相干性,将毗邻距离单元和方位单元的多脉冲接收数据应用三阶张量表示,然后采用HOSVD方法求解三阶张量的海杂波子空间和目标子空间的投影矩阵,最后利用投影矩阵将三阶张量映射到目标子空间以抑制海杂波。该方法与现有子空间类海杂波抑制方法相比,提高了信干噪比(signal to clutter plus noise ratio,SCNR)和峰值旁瓣电平比(peak sidelobe level ratio,PSLR),解决了目标谱峰偏移问题。