In this paper we attempt to classify discrete facility location problems in the right perspective and propose discrete facility location problems that include: median problems, covering problems, center problems, mul...In this paper we attempt to classify discrete facility location problems in the right perspective and propose discrete facility location problems that include: median problems, covering problems, center problems, multi-commodities problems and dynamic problems on the basis of former research by other scholars. We consider vehicle muting location problems, inventory-location problems and hub problems as a recent research field of discrete facility location problems according to literature from the last 10 years.展开更多
目的观察并比较长轴平面内、短轴平面外超声引导平面技术在肝脾破裂手术患者有创动脉血压监测置管中的应用价值。方法选取本院180例接受手术治疗的肝脾破裂患者,分为长轴组、短轴组,各90例,均于术后实施有创动脉血压监测,长轴组于超声...目的观察并比较长轴平面内、短轴平面外超声引导平面技术在肝脾破裂手术患者有创动脉血压监测置管中的应用价值。方法选取本院180例接受手术治疗的肝脾破裂患者,分为长轴组、短轴组,各90例,均于术后实施有创动脉血压监测,长轴组于超声长轴平面内引导下行穿刺置管,短轴组于超声短轴平面外引导下行穿刺置管,比较两种技术的效果与安全性。结果长轴组刺入目标血管时间、总穿刺时间、1次穿刺成功率高于短轴组,其穿刺次数低于短轴组(P<0.05)。长轴组、短轴组并发症发生率分别为7.78%、8.89%(P>0.05)。两组患者置管后6 h SBP、DBP均较置管前上升,其动脉乳酸、去甲肾上腺素用量均下降(P<0.05),长轴组、短轴组置管后6 h生命体征组间比较(P>0.05)。结论两种超声引导平面技术均有着良好的安全性,长轴平面内技术具有穿刺成功率高的优势,但穿刺时间较长,进一步优化长轴平面内引导技术有望缩短穿刺时间,为该技术的推广奠定基础。展开更多
基金This paper is supported by the Natural Science Foundation of Shaanxi Province under Grant No.2004:G11 and Re-search Grant from Shannxi Province Education Bureau under Grant No.04JK173
文摘In this paper we attempt to classify discrete facility location problems in the right perspective and propose discrete facility location problems that include: median problems, covering problems, center problems, multi-commodities problems and dynamic problems on the basis of former research by other scholars. We consider vehicle muting location problems, inventory-location problems and hub problems as a recent research field of discrete facility location problems according to literature from the last 10 years.
文摘目的观察并比较长轴平面内、短轴平面外超声引导平面技术在肝脾破裂手术患者有创动脉血压监测置管中的应用价值。方法选取本院180例接受手术治疗的肝脾破裂患者,分为长轴组、短轴组,各90例,均于术后实施有创动脉血压监测,长轴组于超声长轴平面内引导下行穿刺置管,短轴组于超声短轴平面外引导下行穿刺置管,比较两种技术的效果与安全性。结果长轴组刺入目标血管时间、总穿刺时间、1次穿刺成功率高于短轴组,其穿刺次数低于短轴组(P<0.05)。长轴组、短轴组并发症发生率分别为7.78%、8.89%(P>0.05)。两组患者置管后6 h SBP、DBP均较置管前上升,其动脉乳酸、去甲肾上腺素用量均下降(P<0.05),长轴组、短轴组置管后6 h生命体征组间比较(P>0.05)。结论两种超声引导平面技术均有着良好的安全性,长轴平面内技术具有穿刺成功率高的优势,但穿刺时间较长,进一步优化长轴平面内引导技术有望缩短穿刺时间,为该技术的推广奠定基础。