Product storage policy, single picking volume and picking routing are the three factors of vital importance that affect the efficiency of a crane to pick goods in automated storage and retrieval systems(AS/RS). Compar...Product storage policy, single picking volume and picking routing are the three factors of vital importance that affect the efficiency of a crane to pick goods in automated storage and retrieval systems(AS/RS). Comparative experiments on picking efficiency were conducted targeting picking operation with order of 1 to 20. Based on dedicated and random storage policies, 4 picking methods of patching-based, S-type, return-type and optimized-type routes were used and compared in the experiments. The results show that either the dedicated policy or the random policy was applied, crane worked most efficiently with optimizedtype route, followed by S-type path, patching-based path, and return-type path. When the number of orders in a single picking is larger(more than 5), the random storage policy is preferable to the dedicated policy.展开更多
目的利用光学相干断层扫描血管成像(OCTA)观察非动脉炎性前部缺血性视神经病变(NAION)患者急性期的视盘周围脉络膜血流信号特征。方法对2017年1月至2019年9月首次确诊为NAION且接受OCTA检查的13例(13眼)患者进行回顾性横断面研究。由两...目的利用光学相干断层扫描血管成像(OCTA)观察非动脉炎性前部缺血性视神经病变(NAION)患者急性期的视盘周围脉络膜血流信号特征。方法对2017年1月至2019年9月首次确诊为NAION且接受OCTA检查的13例(13眼)患者进行回顾性横断面研究。由两位医师分别定性分析OCTA中脉络膜毛细血管层的血流信号中的低信号区,并分区。将分区的结果与en face OCT、视野检查结果进行对比。患者均至少随访1个月。结果急性期NAION患眼的视盘OCTA在脉络膜毛细血管层水平的低信号区可分为视盘本身部位、视盘水肿部位和沿神经纤维方向延伸部位3个区域。13眼中,10眼首次就诊时出现3个低信号区,2眼在第2次就诊时出现3个低信号区,1眼仅出现视盘本身部位和视盘水肿部位的低信号区。其中,沿神经纤维方向延伸部位的低信号区与视野缺损关系密切,对应比例达91.6%,该低信号区平均出现时间为发病后19.9 d。随访期内,9眼沿神经纤维方向延伸部位的低信号区出现神经纤维层萎缩。结论NAION患者急性期的视盘周围脉络膜层面的血流信号可以通过OCTA提示神经纤维层水肿、消退以及萎缩的变化过程。展开更多
基金Funded by National Social Science Foundation of China(16CGL018)the Soft Science Research Funds for Chengdu Science and Technology Project(2015-RK00-00206-ZF)the National United Engineering Laboratory of Integrated and Intelligent Transportation,Southwest Jiaotong University,China
文摘Product storage policy, single picking volume and picking routing are the three factors of vital importance that affect the efficiency of a crane to pick goods in automated storage and retrieval systems(AS/RS). Comparative experiments on picking efficiency were conducted targeting picking operation with order of 1 to 20. Based on dedicated and random storage policies, 4 picking methods of patching-based, S-type, return-type and optimized-type routes were used and compared in the experiments. The results show that either the dedicated policy or the random policy was applied, crane worked most efficiently with optimizedtype route, followed by S-type path, patching-based path, and return-type path. When the number of orders in a single picking is larger(more than 5), the random storage policy is preferable to the dedicated policy.
文摘目的利用光学相干断层扫描血管成像(OCTA)观察非动脉炎性前部缺血性视神经病变(NAION)患者急性期的视盘周围脉络膜血流信号特征。方法对2017年1月至2019年9月首次确诊为NAION且接受OCTA检查的13例(13眼)患者进行回顾性横断面研究。由两位医师分别定性分析OCTA中脉络膜毛细血管层的血流信号中的低信号区,并分区。将分区的结果与en face OCT、视野检查结果进行对比。患者均至少随访1个月。结果急性期NAION患眼的视盘OCTA在脉络膜毛细血管层水平的低信号区可分为视盘本身部位、视盘水肿部位和沿神经纤维方向延伸部位3个区域。13眼中,10眼首次就诊时出现3个低信号区,2眼在第2次就诊时出现3个低信号区,1眼仅出现视盘本身部位和视盘水肿部位的低信号区。其中,沿神经纤维方向延伸部位的低信号区与视野缺损关系密切,对应比例达91.6%,该低信号区平均出现时间为发病后19.9 d。随访期内,9眼沿神经纤维方向延伸部位的低信号区出现神经纤维层萎缩。结论NAION患者急性期的视盘周围脉络膜层面的血流信号可以通过OCTA提示神经纤维层水肿、消退以及萎缩的变化过程。
