研究了一种新的AR SαS过程的谱估计算法。该算法将整个数据作为一个整体,利用分数低阶p阶矩从前向、后向两个方向对数据进行处理,获得了一种高分辨率的参数估计算法——双向最小p范数法(Bidirectional Least p Norm,BLPN)。利用得到的...研究了一种新的AR SαS过程的谱估计算法。该算法将整个数据作为一个整体,利用分数低阶p阶矩从前向、后向两个方向对数据进行处理,获得了一种高分辨率的参数估计算法——双向最小p范数法(Bidirectional Least p Norm,BLPN)。利用得到的参数,结合共变谱的定义,构建了AR SαS过程下的共变谱估计表达式,并分别对AR SαS过程参数估计、α稳定分布噪声中的正弦信号的谱估计进行仿真。仿真结果表明,基于BLPN的ARSαS模型的共变谱估计方法对于不同的α值均具有良好的韧性,特别是在α值较小或者短时数据时,本文方法的性能明显优于基于FLOM的AR SαS模型共变谱估计方法。展开更多
AIM To retrospectively review patients with chronic pancreatitis(CP) treated with Frey's procedures between January 2009 and January 2014.METHODS A retrospective review was performed of patients with CP treated wi...AIM To retrospectively review patients with chronic pancreatitis(CP) treated with Frey's procedures between January 2009 and January 2014.METHODS A retrospective review was performed of patients with CP treated with Frey's procedures between January 2009 and January 2014 in the Department of Pancreatic Surgery. A cross-sectional study of postoperative pain relief, quality of life(Qo L), and alcohol and nicotine abuse was performed by clinical interview, letters and telephone interview in January 2016. Qo L of patients was evaluated with the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire(EORTC QLQ-C30) version 3.0. The patients were requested to fill in the questionnaires by themselves via correspondence or clinical interview.RESULTS A total of 80 patients were enrolled for analysis, including 44 who underwent the original Frey's procedure and 36 who underwent a modified Frey's procedure. The mean age was 46 years in the original group and 48 years in the modified group. Thirtyfive male patients(80%) were in the original group and 33(92%) in the modified group. There were no differences in the operating time, blood loss, and postoperative morbidity and mortality between the two groups. The mean follow-up was 50.3 mo in the original group and 48.7 mo in the modified group. There were no differences in endocrine and exocrine function preservation between the two groups. The original Frey's procedure resulted in significantly betterpain relief, as shown by 5-year follow-up(P = 0.032), better emotional status(P = 0.047) and fewer fatigue symptoms(P = 0.028). When stratifying these patients by the M-ANNHEIM severity index, no impact was found on pain relief after the two types of surgery.CONCLUSION The original Frey's procedure is as safe as the modified procedure, but the former yields better pain relief. The severity of CP does not affect postoperative pain relief.展开更多
文摘研究了一种新的AR SαS过程的谱估计算法。该算法将整个数据作为一个整体,利用分数低阶p阶矩从前向、后向两个方向对数据进行处理,获得了一种高分辨率的参数估计算法——双向最小p范数法(Bidirectional Least p Norm,BLPN)。利用得到的参数,结合共变谱的定义,构建了AR SαS过程下的共变谱估计表达式,并分别对AR SαS过程参数估计、α稳定分布噪声中的正弦信号的谱估计进行仿真。仿真结果表明,基于BLPN的ARSαS模型的共变谱估计方法对于不同的α值均具有良好的韧性,特别是在α值较小或者短时数据时,本文方法的性能明显优于基于FLOM的AR SαS模型共变谱估计方法。
文摘AIM To retrospectively review patients with chronic pancreatitis(CP) treated with Frey's procedures between January 2009 and January 2014.METHODS A retrospective review was performed of patients with CP treated with Frey's procedures between January 2009 and January 2014 in the Department of Pancreatic Surgery. A cross-sectional study of postoperative pain relief, quality of life(Qo L), and alcohol and nicotine abuse was performed by clinical interview, letters and telephone interview in January 2016. Qo L of patients was evaluated with the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire(EORTC QLQ-C30) version 3.0. The patients were requested to fill in the questionnaires by themselves via correspondence or clinical interview.RESULTS A total of 80 patients were enrolled for analysis, including 44 who underwent the original Frey's procedure and 36 who underwent a modified Frey's procedure. The mean age was 46 years in the original group and 48 years in the modified group. Thirtyfive male patients(80%) were in the original group and 33(92%) in the modified group. There were no differences in the operating time, blood loss, and postoperative morbidity and mortality between the two groups. The mean follow-up was 50.3 mo in the original group and 48.7 mo in the modified group. There were no differences in endocrine and exocrine function preservation between the two groups. The original Frey's procedure resulted in significantly betterpain relief, as shown by 5-year follow-up(P = 0.032), better emotional status(P = 0.047) and fewer fatigue symptoms(P = 0.028). When stratifying these patients by the M-ANNHEIM severity index, no impact was found on pain relief after the two types of surgery.CONCLUSION The original Frey's procedure is as safe as the modified procedure, but the former yields better pain relief. The severity of CP does not affect postoperative pain relief.
