Still, the authors acknowledge that this is an observational study, and that many other unmeasured factors could have influenced their results. 不过,作者承认,这只是一项观测研究,而且许多别的不可测因素也可能会影响他们的结果。
The researchers acknowledge that the findings could be affected by factors they could not control for, including unmeasured sociodemographic factors, a family history of preterm delivery, maternal substance abuse or smoking, and bacterial or viral infections. 研究者们也承认调查结果可能会受一些非可控因素的影响,包括不可测量的社会人口因素,早产的家族历史,产妇药物滥用,抽烟以及细菌或是病毒性感染。
Given that it is not possible to control for unmeasured confounders, the as-treated analysis may have overstated the treatment effect of surgery. 考虑到不可能控制那些无法预测的混杂,接受治疗分析则可能会夸大手术的治疗效果。
Stabilization Analysis of a Class of Fuzzy Time-delay Systems with Unmeasured States 一类状态不可测模糊时滞系统的稳定性分析
Although statistical modeling could control for these measured baseline differences, the potential for confounding by unmeasured variables existed. 虽然应用统计模型能控制这些基线评估上的差异,但仍然存在一些无法测定的变量导致潜在的混杂。
The Research of On-line Observation for the Unmeasured Inputs of the Chemical System Basing on the Neural Net 基于神经网络在线观测化工系统不可测输入的研究
In this manner, the unmeasured channels are also subjected to an adaptive channel allocation strategy. 在这种情况下,不测量的信道也服从于自适应信道分配策略。
It is always possible that some unknown or unmeasured factors confounded these results, he added. 它始终是可能的,一些不明或衡量因素混淆这些结果,他补充说。
Far from cheapening nature, thinking in terms of "natural capital" can offer a way to assess the crucial but unmeasured benefit that humans derive from the nature. 从自然资本这一角度考虑可以为评估人类从大自然获取的重要的但无法衡量的利益提供一种方式,而不是贬低大自然的价值。
The unmeasured channels may be channels for use in an analog system, or broadcast channels. 不测量信道可以是在模拟系统中使用的信道,或广播信道。
Limitations of this study include possible unmeasured confounding and lack of data concerning cryptorchidism, which is another potential cause of infertility and testicular cancer. 这项研究的限制包括可能未评量的干扰因素,以及缺乏有关隐睾症相关的数据,这是另一个造成不孕症与睾丸癌的潜在原因。
Sensitivity analysis revealed that unmeasured confounders that increase the risk for death could diminish or eliminate the observed associations. 灵敏性分析表明存在死亡风险性增加会减少或去除观察相关性的混杂(因素)。
This insidious disease produces extensive and unmeasured economic losses through reduced efficiency in feed utilization. 这种隐伏性疾病产生了广泛的和未加统计的由于饲料利用率降低的经济损失。
By using the invariant manifold and sliding mode variable structure technique, dynamic output feedback stabilization controllers are proposed, based on known state feedback controllers for a class of nonlinear systems with linear unmeasured states. 针对一类具有线性不可测量状态的非线性系统,基于状态反馈稳定控制器,利用不变流形和滑模变结构控制技术设计了动态输出反馈镇定控制器。
However, the existing two-level matrix projection transformation algorithm may not properly classify the unmeasured variables. 常用的两层次矩阵投影变换算法在对未测数据进行分类时,可能无法识别出所有的不可估计型数据。
Approximate Space and Measure Space, Generalized Rough Sets and Unmeasured Sets 近似空间与测度空间及广义粗集与不可测集
This paper extends the discuss to generalized rough sets and proves that approximation space is basic space of measure space, generalized rough sets and unmeasured sets are different descriptions of uncertainty of sets in approximation space and measure space respectively; 证明了近似空间是测度空间的基础空间,广义粗集和不可测集分别是在近似空间和测度空间中对集合的不确定性的不同表述;
Soft sensor software based on artificial neural network ( ANN) using BP or RBF structure is developed to calculate unmeasured variables online. 采用BP和RBF网络,开发了人工神经网络软测量仪表软件,实现了不可测变量的在线观测。
Fault diagnosis architecture based on adaptive neural networks for a class of unknown nonlinear systems with unmeasured states is proposed. The center vector and width vector of Gaussian function are on-line updated but updating weight matrix. 针对一类模型未知及状态不可测的非线性系统,提出了基于自适应神经网络的故障诊断策略,不仅在线估计神经网络的矩阵权重,而且在线估计高斯函数的宽度和中心。
Secondly, the design method of the observer based on the fault function provided by RBF neural network was proposed for uncertain nonlinear systems with unmeasured states. 然后,针对状态不完全可观测的仿射型非线性系统,提出了基于RBF神经网络逼近故障特性函数的观测器设计方法。
Moreover, by using the Lyapunov theory of finite-time stability and the backstepping constructive methodology skillfully, the unmeasured zero-dynamics are effectively solved, and the design procedure of the finite-time stabilizing controller with adjustable-settling-time is presented. 另外,本部分通过灵活运用有限时间稳定的Lyapunov理论和反步构造方法,有效处理了系统的不可测量零动态,给出了停息时间可调的有限时间稳定控制器的设计步骤。
Making full use of redundancy information, data rectification technique eliminates the gross errors in the raw data, reduces the random measurement errors and estimates the unmeasured variables. 数据校正是一种利用冗余信息,剔除原始数据中的显著误差,降低随机误差对测量值的影响,并设法估计出未测量变量的技术。
The low order model is used to describe the linear relationship between measurable variables and unmeasured variables. The high order model is used to compensate the nonlinear error in low order model. 低阶模型用于对主导变量和辅助变量之间的线性关系进行描述,高阶模型用于对低阶模型存在的非线性误差进行补偿。
To cope with the state unmeasured problem, the Kalman filter is added to the LPV-MPC algorithm. In the meantime, the measurement variables are determined through the observability analysis. 针对状态不可测问题,在LPV-MPC算法中加入Kalman滤波,并通过可观性分析确定了需要测量的变量。
Different from the existing results, the nonlinear system studied here is more general: ( 1) the system has the zero-dynamics which are unmeasured; ( 2) the control parameters are uncertain. 不同于现有文献,本部分所研究的非线性系统更具一般性:(1)系统具有不可量测零动态;(2)系统的控制系数具有不确定性。
Soft-sensing technology is an important method to solve the real-time estimation of unmeasured variables in the field of process control and process detects. 软测量技术是过程控制和过程检测领域解决难测变量实时估计等问题的重要手段。
Confirm the existence of oscillations in the control loop, and the exclusion of control valve nonlinear factors cases, this method can distinguish the model-plant mismatch, the controller tuning problem and unmeasured periodic disturbance. 在检测确认系统存在振荡、并排除控制阀非线性因素的情况下,用该方法能区分模型对象失配、控制器过调和不可测周期性扰动的影响。
Backstepping approach is applied in the recursive process, and a lemma is cleverly used, which can avoid reconstructing the Lyapunov function of the subsystem when the unmeasured states are dealt with. 本文主要利用backstepping方法,在具体的递推设计的过程中,又巧妙地应用一个引理,这样就可以避免为处理不可测状态而重新构造子系统的Lyapunov函数。
Design the state observers by estimating the state variables which are unmeasured completely. 对于电力系统实际运行过程中参数不完全可测的问题,设计了观测器。
In the detection of model-plant mismatch with unmeasured disturbances, existing diagnostic methods need to be taken to invasive test or join a certain stimulus. 针对存在不可测扰动时的模型对象失配的诊断问题,现有的诊断方法需要对控制系统采取侵入式的试验或者加入一定的激励信号。