Results 101 to 110 of about 69,960 (229)

Research of Underwater Acoustic Communication Signal Modulation Recognition and Its Implementation [PDF]

, 2016
随着海洋开发、海洋权益维护、国防安全等领域信息获取和处理需求的不断提升，对水声通信信号的调制样式的自动识别研究成为重要的研究课题。然而目前无线领域常用的通信信号(BPSK，QPSK，MFSK，OFDM)的调制识别方法往往需要较多的调制参数作为先验知识（如精确载波频率、初始相位、符号速率）。由于水声信道的随机时-空-频变、窄带高噪、多途效应及多普勒频移等特性，使得上述这些先验知识在水声信号调制方式未知的情况下很难得到，因此，非合作水声通信信号的自动识别极具挑战性。 信号频谱是对信号在频域方面的一种描述 ...
江伟华
core  

Accountability in Government Use of AI: Citizen Concerns and Preferences

Public Administration, EarlyView.
ABSTRACT Government adoption of AI opens the “pandora's box” of accountability, a core aspect of public value. Despite the centrality of governmental AI accountability, citizens' concerns and preferences in holding governments accountable for AI usage remain poorly understood.
Naikang Feng, Yanto Chandra
wiley   +1 more source

Basic income trials and the politics of scale: A research agenda

Policy Studies Journal, EarlyView.
Abstract The growing popularity of basic income has led to extensive trials of the policy in numerous settings across the world. However, analysis of the politics of basic income, and in particular the political dynamics preceding and resulting from trial programs, lags. In response, we propose a research agenda that uses political scale to investigate
Jurgen De Wispelaere, Marc Doussard, Joe Chrisp   +2 more
wiley   +1 more source

确定金属氧化物避雷器电热模拟参数的试验方法

Dianci bileiqi, 1991
金属氧化物避雷器的能量吸收能力取决于其它元件的温度。预测温度的一种有价值的方法是计算机模拟计算,但必须要有精确的参数。本文提出一种确定这种参数的方法。以前的方法用公式计算所要求的热参数。本文提出采用一次试验的方法提供参数。采用灵敏度分析法评估了参数值的系统误差 ...
doaj  

电能质量调节器的改进无差拍控制

Gaoya dianqi, 2005
传统的无差拍控制是精确数学模型的控制方法,其控制特性受系统参数变化影响较大。为了提高系统的跟踪准确度,笔者提出在线辨识参数的改进无差拍控制策略。分期实时地修正控制参数,使其对系统参数的变化具有良好的适应性,从而有效地改善了系统的跟随性能。
陈继侠, 陈晓东, 孙辉
doaj  

Factors influencing thrombelastography in pregnancy. [PDF]

Zhong Nan Da Xue Xue Bao Yi Xue Ban, 2023
Cao Y, Liang T, Peng J, Zhao X.
europepmc   +1 more source

Scientists in power plays: How substantive were scientists' narratives during the COVID‐19 pandemic?

Policy Studies Journal, EarlyView.
Abstract Scientists who provide expert advice must engage with policy processes. Little is known about whether and how scientists deal with the political dynamics of policy processes that are inherent to policymaking. We study this question by building on the policy dimension concept within the Narrative Policy Framework.
Jule Ksinsik, Caroline Schlaufer
wiley   +1 more source

机械 CAD 软件的模块处理

Jixie chuandong, 1997
本文以全参数减速器ＣＡＤ为例，对机械产品ＣＡＤ软件的参数生成、数据库、全参数绘图三大模块处理技术以及系统结构作了详细阐述 ...
张松林
doaj  

Does public participation foster stakeholder support for policy proposals? Evidence from the European Union

Policy Studies Journal, EarlyView.
Abstract We examine whether and how public participation in policymaking contributes towards fostering stakeholder support for policy proposals formulated in the bureaucratic arena. We explain how key markers of procedural fairness describing both the participation process and policymakers' presentations of it during the decision justification stage co‐
Adriana Bunea, Idunn Nørbech
wiley   +1 more source

变压器油中乙炔门控循环单元网络多步预测超参数优化方法

Gaoya dianqi
油中溶解乙炔作为电力变压器中重要的放电程度表征参量之一，对其进行多步预测可以为变压器故障诊断及预警提供重要依据。现有的状态预测模型主要集中于单步预测，对于未来更长时期变化趋势的预测手段不足。此外，基于深度学习的多步预测模型的超参数选择大多基于经验和朴素的单一控制变量法，超参数之间的耦合关系没有得到充分的研究。文中提出基于多输出策略的门控循环单元（gated recurrent unit，GRU）神经网络多步预测模型，通过改变模型结构超参数和训练超参数研究超参数之间的耦合关系 ...
赵军, 高树国, 何瑞东, 相晨萌, 芮逸凡, 王亚林, 尹毅   +6 more
doaj