We investigate the best performance for linear feedback control systems in the case that plant uncertainty is to be considered. First, we define an average integral square criterion of tracking error over a class of s...We investigate the best performance for linear feedback control systems in the case that plant uncertainty is to be considered. First, we define an average integral square criterion of tracking error over a class of stochastic model errors. By utilizing spectral factorization to minimize the performance index, we derive an optimal controller design method and further study best performance in the presence of stochastic perturbation. The results can be used to evaluate optimal performance in practical control system designs.展开更多
Aiming at the intervention decision-making problem in manned/unmanned aerial vehicle（MAV/UAV） cooperative engagement, this paper carries out a research on allocation strategy of emergency discretion based on human f...Aiming at the intervention decision-making problem in manned/unmanned aerial vehicle（MAV/UAV） cooperative engagement, this paper carries out a research on allocation strategy of emergency discretion based on human factors engineering（HFE）.Firstly, based on the brief review of research status of HFE, it gives structural description to emergency in the process of cooperative engagement and analyzes intervention of commanders. After that,constraint conditions of intervention decision-making of commanders based on HFE（IDMCBHFE） are given, and the mathematical model, which takes the overall efficiency value of handling emergencies as the objective function, is established. Then, through combining K-best and variable neighborhood search（VNS） algorithm, a K-best optimization variable neighborhood search mixed algorithm（KBOVNSMA） is designed to solve the model. Finally,through three groups of simulation experiments, effectiveness and superiority of the proposed algorithm are verified.展开更多
目的:分析眼后段眼内异物行玻璃体切除术(pars plana vitrectormy,PPV)取出异物对视力的影响。方法:回顾性分析2015年12月至2017年1月于重庆医科大学附属第一医院眼科入院诊断为眼后段眼内异物共40例40眼,所有眼后段眼内异物均通过23G微...目的:分析眼后段眼内异物行玻璃体切除术(pars plana vitrectormy,PPV)取出异物对视力的影响。方法:回顾性分析2015年12月至2017年1月于重庆医科大学附属第一医院眼科入院诊断为眼后段眼内异物共40例40眼,所有眼后段眼内异物均通过23G微创PPV取出。研究统计了年龄、性别、术前/术后最佳矫正视力(best corrected visual acuity,BCVA),眼后段异物性质、大小,眼内异物移除时间,眼内异物进入位置,眼内异物残留位置,手术时机,手术方式和并发症等因素。结果:40例患者异物均被取出,取出率为100%,术后平均BCVA较术前平均BCVA明显增高(t=4.295,P=0.000),具有统计学意义。患者视力的主要影响因素为视网膜脱离(P=0.000)、视网膜裂孔(P=0.001)、眼内异物的大小(P=0.023)、异物取出的时间(P=0.006)、前房积血(P=0.032)、玻璃体积血(P=0.025)等。结论:更大的眼内异物、合并视网膜脱离、视网膜裂孔、前房积血、玻璃体积血、异物取出时间越长,在开放性眼外伤中会引起更严重的后果,视力预后会更差。本研究中,是否行Ⅰ期缝合+玻璃体腔内注药术或者直接行PPV联合眼球清创缝合对视力及解剖学的恢复并无显著影响,但是异物取出的早晚对视力预后有影响,PPV能够更好地取出眼内异物并发现眼内并发症,及时处理,对患者的视力恢复起重要作用。展开更多
基金the National High-Technology Research and Development Program of China(Grant No.2003AA517020)
文摘We investigate the best performance for linear feedback control systems in the case that plant uncertainty is to be considered. First, we define an average integral square criterion of tracking error over a class of stochastic model errors. By utilizing spectral factorization to minimize the performance index, we derive an optimal controller design method and further study best performance in the presence of stochastic perturbation. The results can be used to evaluate optimal performance in practical control system designs.
基金supported by the National Natural Science Foundation of China(61573017)the Doctoral Foundation of Air Force Engineering University(KGD08101604)
文摘Aiming at the intervention decision-making problem in manned/unmanned aerial vehicle（MAV/UAV） cooperative engagement, this paper carries out a research on allocation strategy of emergency discretion based on human factors engineering（HFE）.Firstly, based on the brief review of research status of HFE, it gives structural description to emergency in the process of cooperative engagement and analyzes intervention of commanders. After that,constraint conditions of intervention decision-making of commanders based on HFE（IDMCBHFE） are given, and the mathematical model, which takes the overall efficiency value of handling emergencies as the objective function, is established. Then, through combining K-best and variable neighborhood search（VNS） algorithm, a K-best optimization variable neighborhood search mixed algorithm（KBOVNSMA） is designed to solve the model. Finally,through three groups of simulation experiments, effectiveness and superiority of the proposed algorithm are verified.
