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201.
现场总线是现代工业控制技术的发展方向,对于现场总线来说,其特点是现场通信、现场设备互联,具有较好的互操作性,并且功能模块分散化,同时具有开放式互联网等。本文通过对现场总线技术,以及通信协议进行仔细分析和研究,对几种常用的现场总线进行比较,说明了由其构成的工业控制系统的结构,最后针对CAN总线设计了一种工业控制系统并强调了在设计中所需注意的问题。 相似文献
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《Socio》2021
The mitigation of greenhouse gas concentration has become a first-order issue for decision making in environmental sustainability. Countries can meet their mitigation commitments and environmental objectives through multiple instruments. A key role is played by cooperative mechanisms, such as the Clean Development Mechanism (CDM), under the Kyoto Protocol, and a similar mechanism established by the Paris Agreement (Art. 6), whose implementation rules are still under negotiation. However, another form of cooperation was already established under the different framework of the Official Development Assistance (ODA), potentially sharing abatement purposes. This paper aims to compare the mitigation actions implemented either as CDM or ODA projects. We conduct a multi-criteria econometric analysis, based on an originally created, harmonised dataset that merges renewable energy CDM projects and comparable ODA projects to investigate the role of the institutional framework in influencing the effectiveness of reducing emissions worldwide. Results show that the Kyoto Protocol had a positive impact in terms of cost-effectiveness for renewable energy projects and that it stimulated policy actions for environmental sustainability. Accordingly, in view of the implementation of Article 6 of the Paris Agreement, it is extremely important both to look to the past to draw lessons from Kyoto's successes and failures and to apply multi-criteria decision-making approaches for the design of environmental policies. 相似文献
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We develop a continuous-time control approach to optimal trading in a Proof-of-Stake (PoS) blockchain, formulated as a consumption-investment problem that aims to strike the optimal balance between a participant's (or agent's) utility from holding/trading stakes and utility from consumption. We present solutions via dynamic programming and the Hamilton–Jacobi–Bellman (HJB) equations. When the utility functions are linear or convex, we derive close-form solutions and show that the bang-bang strategy is optimal (i.e., always buy or sell at full capacity). Furthermore, we bring out the explicit connection between the rate of return in trading/holding stakes and the participant's risk-adjusted valuation of the stakes. In particular, we show when a participant is risk-neutral or risk-seeking, corresponding to the risk-adjusted valuation being a martingale or a sub-martingale, the optimal strategy must be to either buy all the time, sell all the time, or first buy then sell, and with both buying and selling executed at full capacity. We also propose a risk-control version of the consumption-investment problem; and for a special case, the “stake-parity” problem, we show a mean-reverting strategy is optimal. 相似文献
205.
在信息迅速发展的今天,计算机信息技术已经成为一种主导技术,信息产业也成为主导的产业,信息产业已经成为当今社会一种新的经济增长点。信息产业在与计算机技术和通信产业相结合的基础上,迅速的发展成一门庞大的学科。对计算机嵌入式实时操作系统的研究及分析,已成为一种必须的解决的重要课题,以适应当今社会的高速发展。下面就针对如何做好对计算机嵌入式实时操作系统的研究及分析谈谈自己的感受和体会。 相似文献
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近年来,空间网络协议大力发展,CCSDS空间网络协议体系已成为事实上的标准。基于跟踪与数据中继卫星系统(TDRSS)地面站中低速中继终端设备进行相应改造,增加网关路由板卡,加载CCSDS空间传输协议软件,将原来的中低速中继终端设备改造成带有路由网关功能的中低速中继终端设备。在此基础上,采用两台增加路由网关功能的中低速中继终端设备以及信道模拟器搭建天地网络演示验证系统,并分别对采用TCP协议和PEP增强协议作为传输层协议的HTTP应用进行了性能分析比对,证明PEP增强协议更能适应天地网络传输。 相似文献
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