This paper extends the work on cross-layer design which combines adaptive modulation and coding at the physical layer and hybrid automatic repeat request protocol at the data link layer. By contrast with previous work...This paper extends the work on cross-layer design which combines adaptive modulation and coding at the physical layer and hybrid automatic repeat request protocol at the data link layer. By contrast with previous works on this topic, the present development and the performance analysis as well, is based on rate compatible punctured turbo codes. Rate compatibility provides incremental redundancy in transmission of parity bits for error correction at the data link layer. Turbo coding and iterative decoding gives lower packet error rate values in low signal-to-noise ratio regions of the adaptive modulation and coding (AMC) schemes. Thus, the applied cross-layer design results in AMC schemes can achieve better spectral efficiency than convolutional one while it retains the QoS requirements at the application layer. Numerical results in terms of spectral efficiency for both turbo and convolutional rate compatible punctured codes are presented. For a more comprehensive presentation, the performance of rate compatible LDPC is contrasted with turbo case as well as the performance complexity is discussed for each of the above codes.展开更多
目的针对开展超声引导下桡动脉穿刺置管术的ICU危重症患者,施行优化护理措施,评价其护理效果。方法方便选取2021年1月—2023年1月厦门市苏颂医院重症加强护理病房(Intensive Care Unit,ICU)危重症患者80例为研究对象。以盲选法为分组依...目的针对开展超声引导下桡动脉穿刺置管术的ICU危重症患者,施行优化护理措施,评价其护理效果。方法方便选取2021年1月—2023年1月厦门市苏颂医院重症加强护理病房(Intensive Care Unit,ICU)危重症患者80例为研究对象。以盲选法为分组依据,对照组40例、观察组40例。所有患者均开展超声引导下桡动脉穿刺置管术,对照组接受常规护理措施,观察组接受优化护理措施。统计两组的穿刺成功次数情况、术后并发症发生情况、护理满意度情况、穿刺效果相关指标。结果观察组穿刺一次成功率为87.50%,高于对照组的50.00%,穿刺两次及以上成功率为12.50%,低于对照组的47.50%,差异有统计学意义(χ^(2)=13.091、11.667,P均<0.05)。与对照组相比,观察组穿刺时间更短,穿刺次数更少,护理后的生活质量评分、疾病知识掌握程度评分更高,差异有统计学意义(P均<0.05)。结论针对开展超声引导下桡动脉穿刺置管术的ICU危重症患者,施行优化护理措施,能够提升穿刺一次成功率,降低并发症发生率,提高知识掌握率,提高生活质量。展开更多
文摘This paper extends the work on cross-layer design which combines adaptive modulation and coding at the physical layer and hybrid automatic repeat request protocol at the data link layer. By contrast with previous works on this topic, the present development and the performance analysis as well, is based on rate compatible punctured turbo codes. Rate compatibility provides incremental redundancy in transmission of parity bits for error correction at the data link layer. Turbo coding and iterative decoding gives lower packet error rate values in low signal-to-noise ratio regions of the adaptive modulation and coding (AMC) schemes. Thus, the applied cross-layer design results in AMC schemes can achieve better spectral efficiency than convolutional one while it retains the QoS requirements at the application layer. Numerical results in terms of spectral efficiency for both turbo and convolutional rate compatible punctured codes are presented. For a more comprehensive presentation, the performance of rate compatible LDPC is contrasted with turbo case as well as the performance complexity is discussed for each of the above codes.
文摘目的针对开展超声引导下桡动脉穿刺置管术的ICU危重症患者,施行优化护理措施,评价其护理效果。方法方便选取2021年1月—2023年1月厦门市苏颂医院重症加强护理病房(Intensive Care Unit,ICU)危重症患者80例为研究对象。以盲选法为分组依据,对照组40例、观察组40例。所有患者均开展超声引导下桡动脉穿刺置管术,对照组接受常规护理措施,观察组接受优化护理措施。统计两组的穿刺成功次数情况、术后并发症发生情况、护理满意度情况、穿刺效果相关指标。结果观察组穿刺一次成功率为87.50%,高于对照组的50.00%,穿刺两次及以上成功率为12.50%,低于对照组的47.50%,差异有统计学意义(χ^(2)=13.091、11.667,P均<0.05)。与对照组相比,观察组穿刺时间更短,穿刺次数更少,护理后的生活质量评分、疾病知识掌握程度评分更高,差异有统计学意义(P均<0.05)。结论针对开展超声引导下桡动脉穿刺置管术的ICU危重症患者,施行优化护理措施,能够提升穿刺一次成功率,降低并发症发生率,提高知识掌握率,提高生活质量。