To decrease the transmission delay of uplink voice over IP(VoIP)services in IEEE 802.16e sys-tem,a novel strategy which includes a load-balance algorithm and an extended earliest deadline first(EEDF)scheduling algorit...To decrease the transmission delay of uplink voice over IP(VoIP)services in IEEE 802.16e sys-tem,a novel strategy which includes a load-balance algorithm and an extended earliest deadline first(EEDF)scheduling algorithm is proposed.Subsequently,this paper analyzes the performance of the pro-posed strategy in terms of transmission delay of VoIP services,system capacity,throughput and compati-bility with IEEE 802 .16e standard.Finally,simulation experiments are carried out to verify the improve-ment of the proposed strategy.The simulation results match well with the theoretical analysis and showthat the proposed strategy reduces the transmission delay of uplink VoIP services and improves the capaci-ty and throughput.These improvements are remarkable especially when the load of system is heavy.展开更多
Based on the structures of the short preamble and long preamble, which are defined for synchronization in IEEES02.16e specification, the robust synchronization algorithm for IEEES02.16e OFDM system is proposed. The co...Based on the structures of the short preamble and long preamble, which are defined for synchronization in IEEES02.16e specification, the robust synchronization algorithm for IEEES02.16e OFDM system is proposed. The correlations among the sample sequences in the preamble are investigated, especially the correlation between the first sample sequence and the last sample sequence in the long preamble. The conventional joint timing and frequency synchronization algorithm is reviewed based on the short preamble referring to the algorithm proposed by Schmidl, then a robust joint timing and frequency synchronization algorithm is proposed based on the long preamble. The simulations in the multi-path and frequency selective fading channel show that the proposed algorithm has improved the performances of timing metric plateau, timing offset and synchronization acquisition time even when signal-to-noise ratio is less than -5 dB.展开更多
Based on five scheduling types and their QoS requirements defined in IEEE 802.16e specification, this paper proposes a new scheduring algorithm for non-real-time or real-time multimedia services. Taking the performanc...Based on five scheduling types and their QoS requirements defined in IEEE 802.16e specification, this paper proposes a new scheduring algorithm for non-real-time or real-time multimedia services. Taking the performances of efficiency, fairness and complexity into consideration, the proposed algorithm enhances the efficiency of air interface resource at the expense of the short-time unfairness, but ensures the long-time fairness. Moreover, the proposed algorithm introduces an efficient QoS assurance mechanism, which implements the functions of congestion control, queuing management and traffic management. The simulation results based on a simplified traffic model show that the proposed algorithm guarantees better performances of efficiency and fairness than conventional algorithms, without increasing the algorithm complexity. Especially on the occasion of heavy-traffic requirement, the performance of efficiency and fairness can be improved by 50% at most.展开更多
In plants,the ubiquitin–proteasome system(UPS)plays a central role in hormonal regulation,including the action of the phytohormone auxin,which orchestrates numerous aspects of growth and development.Auxin modulates r...In plants,the ubiquitin–proteasome system(UPS)plays a central role in hormonal regulation,including the action of the phytohormone auxin,which orchestrates numerous aspects of growth and development.Auxin modulates redox metabolism and promotes the accumulation of nitric oxide(NO)in various tissues and physiological contexts.NO functions as a redox signaling molecule,exerting its effects in part through the reversible oxidation of cysteine residues via a post-translational modification known as S-nitrosylation.Recent findings highlight a dynamic interplay between S-nitrosylation and the ubiquitination machinery,shaping critical aspects of auxin-mediated plant responses.In this review,we summarize current knowledge on redox regulation of UPS components involved in auxinmediated pathways and propose new perspectives on the integration of hormonal and redox signaling in plants.We describe and discuss the complexity of the latest evidence supporting the role of NO as a second messenger in auxin signaling,with S-nitrosylation acting as a regulatory mechanism that fine-tunes the UPS to control developmental outcomes.We focused on the direct effects of NO that include S-nitrosylation of specific cysteine residues of substrates,adaptors,and substrate receptors belonging to different CULLIN1-and CULLIN4-based E3 ubiquitin ligase complexes.展开更多
OBJECTIVE:To systematically assess the safety and effectiveness of Compound E’jiao Jiang(复方阿胶浆,CEJ)for treating leukopenia.METHODS:Four English and four Chinese databases were searched for randomized controlled ...OBJECTIVE:To systematically assess the safety and effectiveness of Compound E’jiao Jiang(复方阿胶浆,CEJ)for treating leukopenia.METHODS:Four English and four Chinese databases were searched for randomized controlled trials(RCTs)on CEJ for treating leukopenia up to July 1,2024.Two researchers independently screened the studies and extracted necessary data.Methodological quality and risk of bias were assessed using the Cochrane risk-of-bias tool.Articles eligible for Meta-analysis were analyzed using RevMan.RESULTS:A total of 28 RCTs involving 2041 participants were included,with 1034 in the experimental group and 1007 in the control group.The Meta-analysis showed a significant effect of CEJ in treating leukopenia caused by tumor and immune diseases(three RCTs)[risk ratio(RR)=1.17,95%confidence interval(CI)(1.08,1.27),P=0.0002,I^(2)=35%].The combination of CEJ and Western Medicine showed superior results in terms of white blood cell(WBC)counts(fifteen RCTs)[mean difference(MD)=1.12,95%CI(0.83,1.42),P<0.00001,I^(2)=88%],Karnofsky Performance Status(KPS)levels(seven RCTs)[RR=1.39,95%CI(1.25,1.55),P<0.00001,I^(2)=36%],and mitigation of bone marrow toxicity(eleven RCTs)[RR=0.61,95%CI(0.54,0.69),P<0.00001,I^(2)=24%]compared to Western Medicine alone.Adverse events mainly included gastrointestinal and digestive reactions associated with chemotherapy drugs.CONCLUSION:CEJ alone or in combination with Western Medicine for treating leukopenia caused by tumor and immune diseases improved WBC counts,clinical efficacy,and quality of life.It also reduced bone marrow toxicity-induced leukopenia,enhanced the efficacy of chemotherapy while reducing its toxicity,and alleviated symptoms.No significant adverse events were reported in the RCTs,indicating favorable efficacy and safety.The Grading of Recommendations Assessment,Development and Evaluation assessment indicated a low level of evidence for CEJ in improving leukocyte elevation efficacy,KPS levels,and myelosuppressive toxicity.Therefore,large-scale,high-quality,rigorous multicenter double-blind controlled trials are recommended to strengthen the evidence level.展开更多
自适应调制根据瞬时信道信噪比选择适当的调制方式,能够改善系统的BER性能以及平均吞吐量性能.在常用于高速移动环境的六径瑞利衰落信道模型下,研究自适应调制系统的最佳信噪比门限值,使系统的平均吞吐量最大,同时能够保证系统达到目标...自适应调制根据瞬时信道信噪比选择适当的调制方式,能够改善系统的BER性能以及平均吞吐量性能.在常用于高速移动环境的六径瑞利衰落信道模型下,研究自适应调制系统的最佳信噪比门限值,使系统的平均吞吐量最大,同时能够保证系统达到目标BER性能.得到的最佳信噪比门限值可以用于ITU-RM.1225 Vehicular Test A模型的自适应调制系统.给出了最佳信噪比门限值用于IEEE802.16e OFDM自适应调制系统的性能仿真,并对仿真结果进行了分析.展开更多
研究了一种基于IEEE802.16e的正交频分复用(orthogonal frequency division multiplexing,OFDM)定时同步算法,结合IEEE802.16e协议定义的OFDM帧结构特点,给出了面向DSP硬件平台的OFDM系统中同步子系统实现方案,最后利用TI公司的TMS320C6...研究了一种基于IEEE802.16e的正交频分复用(orthogonal frequency division multiplexing,OFDM)定时同步算法,结合IEEE802.16e协议定义的OFDM帧结构特点,给出了面向DSP硬件平台的OFDM系统中同步子系统实现方案,最后利用TI公司的TMS320C6416对该方案进行了实现。结果表明,提出的实现方案具有良好的性能。展开更多
测距作为WiMAX上行链路调整时间偏置、功率信息和载波频率的一种方法,在系统接入和通信过程中起着重要作用。深入研究了基于ARM处理器的802.16e系统正交频分多址(orthogonal frequency division multiple ac-cess,OFDMA)物理层的周期测...测距作为WiMAX上行链路调整时间偏置、功率信息和载波频率的一种方法,在系统接入和通信过程中起着重要作用。深入研究了基于ARM处理器的802.16e系统正交频分多址(orthogonal frequency division multiple ac-cess,OFDMA)物理层的周期测距的软件设计与实现,给出了802.16e系统OFDMA物理层的周期测距算法和流程、周期测距码的发射和检测原理以及周期测距模块的C语言设计。在搭建的测试平台上进行链路测试,结果表明此方案是可行的。展开更多
基金supported by the High Technology Research and Development Programme of China(No.2006AA01Z235)
文摘To decrease the transmission delay of uplink voice over IP(VoIP)services in IEEE 802.16e sys-tem,a novel strategy which includes a load-balance algorithm and an extended earliest deadline first(EEDF)scheduling algorithm is proposed.Subsequently,this paper analyzes the performance of the pro-posed strategy in terms of transmission delay of VoIP services,system capacity,throughput and compati-bility with IEEE 802 .16e standard.Finally,simulation experiments are carried out to verify the improve-ment of the proposed strategy.The simulation results match well with the theoretical analysis and showthat the proposed strategy reduces the transmission delay of uplink VoIP services and improves the capaci-ty and throughput.These improvements are remarkable especially when the load of system is heavy.
文摘Based on the structures of the short preamble and long preamble, which are defined for synchronization in IEEES02.16e specification, the robust synchronization algorithm for IEEES02.16e OFDM system is proposed. The correlations among the sample sequences in the preamble are investigated, especially the correlation between the first sample sequence and the last sample sequence in the long preamble. The conventional joint timing and frequency synchronization algorithm is reviewed based on the short preamble referring to the algorithm proposed by Schmidl, then a robust joint timing and frequency synchronization algorithm is proposed based on the long preamble. The simulations in the multi-path and frequency selective fading channel show that the proposed algorithm has improved the performances of timing metric plateau, timing offset and synchronization acquisition time even when signal-to-noise ratio is less than -5 dB.
基金DONG Guojun, born in 1976,male, doctorate student,E-mail:zjrobindong@163.com.
文摘Based on five scheduling types and their QoS requirements defined in IEEE 802.16e specification, this paper proposes a new scheduring algorithm for non-real-time or real-time multimedia services. Taking the performances of efficiency, fairness and complexity into consideration, the proposed algorithm enhances the efficiency of air interface resource at the expense of the short-time unfairness, but ensures the long-time fairness. Moreover, the proposed algorithm introduces an efficient QoS assurance mechanism, which implements the functions of congestion control, queuing management and traffic management. The simulation results based on a simplified traffic model show that the proposed algorithm guarantees better performances of efficiency and fairness than conventional algorithms, without increasing the algorithm complexity. Especially on the occasion of heavy-traffic requirement, the performance of efficiency and fairness can be improved by 50% at most.
基金supported by grants from CONICET(PIP 0237 to MCT)Agencia Nacional de Promoción Científica y Tecnológica(ANPCYT,grant PICT-2020-0178 to MJI)Universidad Nacional deMar del Plata(EXA 1217/24 and 1179/24 to MCT).
文摘In plants,the ubiquitin–proteasome system(UPS)plays a central role in hormonal regulation,including the action of the phytohormone auxin,which orchestrates numerous aspects of growth and development.Auxin modulates redox metabolism and promotes the accumulation of nitric oxide(NO)in various tissues and physiological contexts.NO functions as a redox signaling molecule,exerting its effects in part through the reversible oxidation of cysteine residues via a post-translational modification known as S-nitrosylation.Recent findings highlight a dynamic interplay between S-nitrosylation and the ubiquitination machinery,shaping critical aspects of auxin-mediated plant responses.In this review,we summarize current knowledge on redox regulation of UPS components involved in auxinmediated pathways and propose new perspectives on the integration of hormonal and redox signaling in plants.We describe and discuss the complexity of the latest evidence supporting the role of NO as a second messenger in auxin signaling,with S-nitrosylation acting as a regulatory mechanism that fine-tunes the UPS to control developmental outcomes.We focused on the direct effects of NO that include S-nitrosylation of specific cysteine residues of substrates,adaptors,and substrate receptors belonging to different CULLIN1-and CULLIN4-based E3 ubiquitin ligase complexes.
基金Supported by The Qihuang Scholars Support Program of the National Administration of Traditional Chinese Medicinet:2021 Qihuang Scholars Support Project(National Chinese Medicine Teaching Letter[2022]6)National Traditional Medicine Administration's Project for Establishing National Famous and Elderly Traditional Medicine Transmission Workshops:Xie Yanming National Famous Traditional Chinese Medicine Expert Transmission Studio(National Chinese Medicine Education Letter[2022]75)。
文摘OBJECTIVE:To systematically assess the safety and effectiveness of Compound E’jiao Jiang(复方阿胶浆,CEJ)for treating leukopenia.METHODS:Four English and four Chinese databases were searched for randomized controlled trials(RCTs)on CEJ for treating leukopenia up to July 1,2024.Two researchers independently screened the studies and extracted necessary data.Methodological quality and risk of bias were assessed using the Cochrane risk-of-bias tool.Articles eligible for Meta-analysis were analyzed using RevMan.RESULTS:A total of 28 RCTs involving 2041 participants were included,with 1034 in the experimental group and 1007 in the control group.The Meta-analysis showed a significant effect of CEJ in treating leukopenia caused by tumor and immune diseases(three RCTs)[risk ratio(RR)=1.17,95%confidence interval(CI)(1.08,1.27),P=0.0002,I^(2)=35%].The combination of CEJ and Western Medicine showed superior results in terms of white blood cell(WBC)counts(fifteen RCTs)[mean difference(MD)=1.12,95%CI(0.83,1.42),P<0.00001,I^(2)=88%],Karnofsky Performance Status(KPS)levels(seven RCTs)[RR=1.39,95%CI(1.25,1.55),P<0.00001,I^(2)=36%],and mitigation of bone marrow toxicity(eleven RCTs)[RR=0.61,95%CI(0.54,0.69),P<0.00001,I^(2)=24%]compared to Western Medicine alone.Adverse events mainly included gastrointestinal and digestive reactions associated with chemotherapy drugs.CONCLUSION:CEJ alone or in combination with Western Medicine for treating leukopenia caused by tumor and immune diseases improved WBC counts,clinical efficacy,and quality of life.It also reduced bone marrow toxicity-induced leukopenia,enhanced the efficacy of chemotherapy while reducing its toxicity,and alleviated symptoms.No significant adverse events were reported in the RCTs,indicating favorable efficacy and safety.The Grading of Recommendations Assessment,Development and Evaluation assessment indicated a low level of evidence for CEJ in improving leukocyte elevation efficacy,KPS levels,and myelosuppressive toxicity.Therefore,large-scale,high-quality,rigorous multicenter double-blind controlled trials are recommended to strengthen the evidence level.
文摘自适应调制根据瞬时信道信噪比选择适当的调制方式,能够改善系统的BER性能以及平均吞吐量性能.在常用于高速移动环境的六径瑞利衰落信道模型下,研究自适应调制系统的最佳信噪比门限值,使系统的平均吞吐量最大,同时能够保证系统达到目标BER性能.得到的最佳信噪比门限值可以用于ITU-RM.1225 Vehicular Test A模型的自适应调制系统.给出了最佳信噪比门限值用于IEEE802.16e OFDM自适应调制系统的性能仿真,并对仿真结果进行了分析.
文摘研究了一种基于IEEE802.16e的正交频分复用(orthogonal frequency division multiplexing,OFDM)定时同步算法,结合IEEE802.16e协议定义的OFDM帧结构特点,给出了面向DSP硬件平台的OFDM系统中同步子系统实现方案,最后利用TI公司的TMS320C6416对该方案进行了实现。结果表明,提出的实现方案具有良好的性能。
文摘测距作为WiMAX上行链路调整时间偏置、功率信息和载波频率的一种方法,在系统接入和通信过程中起着重要作用。深入研究了基于ARM处理器的802.16e系统正交频分多址(orthogonal frequency division multiple ac-cess,OFDMA)物理层的周期测距的软件设计与实现,给出了802.16e系统OFDMA物理层的周期测距算法和流程、周期测距码的发射和检测原理以及周期测距模块的C语言设计。在搭建的测试平台上进行链路测试,结果表明此方案是可行的。
