A 2nd-Order ΔΣAD Modulator Using Dynamic Analog Components with Simplified Operation Phase

2018 ◽  
Vol E101.A (2) ◽  
pp. 425-433 ◽  
Author(s):  
Chunhui PAN ◽  
Hao SAN
Keyword(s):  
Operation Phase

Assessing the effectiveness of renewable energy sector support mechanisms

2020 ◽  
Vol 26 (6) ◽  
pp. 1392-1413
Author(s):  
S.V. Ratner
Keyword(s):  
Renewable Energy ◽  
Project Management ◽  
Wind Power ◽  
Learning By Doing ◽  
Comprehensive Analysis ◽  
Incentive Mechanisms ◽  
Support Programme ◽  
Support Mechanisms ◽  
Generating Equipment ◽  
Operation Phase

Subject. This article discusses the effectiveness of government programmes to support renewable energy and whether they should continue to be implemented. Objectives. The article aims to conduct a comprehensive analysis of the changes in solar and wind power projects under the State support programme within the period from 2014 to 2019 and assess the effectiveness of the acting incentive mechanisms. Methods. For the study, I used the Learning-by-Doing theory and Project Management principles and methods. Results. The article proposes to consider the local content of the projects implemented as the key effectiveness indicator of the renewable energy support programme in Russia. For solar projects, this figure is currently significantly higher than the planned one, and it corresponds to the planned one for wind projects. In general, therefore, the programme can be considered effective. Conclusions. Further improvements in renewable energy support mechanisms should take into account the need to drastically increase the pace of training in the full cycle of the renewable energy project, including the operation phase of generating equipment and the supply of electricity to the grid.

scholarly journals Machine learning and simulation-based surrogate modeling for improved process chain operation

2021 ◽  
Author(s):  
André Hürkamp ◽  
Sebastian Gellrich ◽  
Antal Dér ◽  
Christoph Herrmann ◽  
Klaus Dröder ◽  
...  
Keyword(s):  
Surrogate Modeling ◽  
Temperature History ◽  
Injection Molding Process ◽  
Process Chain ◽  
Molding Process ◽  
Whole Process ◽  
Virtual Production ◽  
Sensor Model ◽  
Fast Prediction ◽  
Operation Phase

AbstractIn this contribution, a concept is presented that combines different simulation paradigms during the engineering phase. These methods are transferred into the operation phase by the use of data-based surrogates. As an virtual production scenario, the process combination of thermoforming continuous fiber-reinforced thermoplastic sheets and injection overmolding of thermoplastic polymers is investigated. Since this process is very sensitive regarding the temperature, the volatile transfer time is considered in a dynamic process chain control. Based on numerical analyses of the injection molding process, a surrogate model is developed. It enables a fast prediction of the product quality based on the temperature history. The physical model is transferred to an agent-based process chain simulation identifying lead time, bottle necks and quality rates taking into account the whole process chain. In the second step of surrogate modeling, a feasible soft sensor model is derived for quality control over the process chain during the operation stage. For this specific uses case, the production rejection can be reduced by 12% compared to conventional static approaches.

Optimal Software Release Policies with Debugging Time Lag

1997 ◽  
Vol 04 (03) ◽  
pp. 241-255 ◽  
Author(s):  
Tadashi Dohi ◽  
Naoto Kaio ◽  
Shunji Osaki
Keyword(s):  
Error Detection ◽  
Software Maintenance ◽  
Growth Models ◽  
Time Lag ◽  
Computer Software ◽  
Release Time ◽  
Software Release ◽  
Software Reliability Growth ◽  
Operation Phase ◽  
Non Homogeneous Poisson Process

This paper presents a new stochastic model for determining the optimal release time for a computer software in testing phase, taking account of the debugging time lag. In the earlier works, most of software release models were considered, but it was assumed that an error detected can be removed instantaneously. In other words, none discussed quantitatively the effect of the software maintenance action in the optimal software release time. Main purpose of this work is to relate the optimal software release policy with the arrival-service process on the software operation phase by users. We use the Non-Homogeneous Poisson Process (NHPP) type of software reliability growth models as the software error detection phenomena and obtain the optimal software release policies minimizing the expected total software costs. As a result, the usage circumstance of a software in operation phase gives a monotone effect to the software release planning.

scholarly journals Inspection of W 7-X plasma-facing components after the operation phase OP1.2b: observations and first assessments

2020 ◽  
Vol T171 ◽  
pp. 014033 ◽  
Author(s):  
C P Dhard ◽  
S Äkäslompolo ◽  
M Balden ◽  
J Baldzuhn ◽  
C Biedermann ◽  
...  
Keyword(s):  
Plasma Facing Components ◽  
Operation Phase

scholarly journals Cascading Failure Dynamics against Intentional Attack for Interdependent Industrial Internet of Things

Complexity ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Hao Peng ◽  
Zhen Qian ◽  
Zhe Kan ◽  
Dandan Zhao ◽  
Juan Yu ◽  
...  
Keyword(s):  
Risk Factors ◽  
Internet Of Things ◽  
Cascading Failure ◽  
Medical Systems ◽  
Industrial Internet Of Things ◽  
Industrial Internet ◽  
Intentional Attack ◽  
Operation Phase ◽  
Machine Communication ◽  
Energy Grid

The emerging Industrial Internet of Things (IIoT) provides industries with an opportunity to collect, aggregate, and analyze data from sensors, including motion control, machine-to-machine communication, predictive maintenance, smart energy grid, big data analysis, and other smart connected medical systems. The physical systems and the cyber systems are organically integrated, forming an interdependent IIoT. This system provides us with enormous advantages, but at the same time, it also introduces the main safety challenges in the design and operation phase. To exploit the security threats of IIoT systems, in this paper, we propose a novel security-by-design approach for interdependent IIoT environments across two different levels, namely, theory modeling and runtime simulation. Our method theoretically analyzes the cascading failure dynamics of the intentional attack network. Simultaneously, we verified the theoretical results through simulations and gave the risk factors that affect the system’s security to mitigate potential security attack threats. Besides, we prove its applicability through comparative simulation experiments to study application environments that rely on IIoT, which shows that our method helps identify risk factors and mitigate IIoT attacks’ mechanism.

scholarly journals Kali Gandaki ‘A’ Hydroelectric Project in Environmental Perspectives

2008 ◽  
Vol 1 ◽  
pp. 15-21
Author(s):  
Rajendra P. Thanju
Keyword(s):  
Local Community ◽  
Mitigation Measures ◽  
Public Infrastructure ◽  
Energy And Environment ◽  
Hydroelectric Project ◽  
Hydropower Potential ◽  
Project Construction ◽  
Community Improvement ◽  
Operation Phase ◽  
Installed Capacity

Hydropower is one of the cleanest, renewable and environmentally benign sources of energy. Nepal is blessed with immense source of water resources and huge hydropower potential. The Kali Gandaki ‘A’ (KGA) Hydroelectric Project is the largest hydropower project constructed so far in Nepal. The project is a daily pondage type scheme with an installed capacity of 144 MW. The KGA is one of the first largest hydropower projects that has been well studied environmentally and socially in the pre-project, construction and operation stages. A full team of multi-disciplinary professionals was involved during the construction phase to monitor environmental impacts and compliance with contract clauses, and to implement the mitigation measures. Implementation of KGA in what was once considered as a remote area, has resulted in multifold beneficial impacts to the local community. Improvement of public infrastructure, enhanced educational facilities and employment of local populations, including affected families during project construction and operation phase, have enhanced the quality of rural lives. The KGA operation has contributed significantly to Nepal’s power system and has boosted the economic development of the country. Key words: Hydropower; environmental monitoring; impacts; mitigation; resettlement; Nepal Hydro Nepal: Journal of Water, Energy and Environment Vol. I No. 1, 2007 pp. 15-21

Exploring potential benefits of bridge condition assessment in highway operations

2019 ◽  
Author(s):  
Wen-Jun Cao ◽  
Wang-Sheng Liu ◽  
Chan Ghee Koh ◽  
I. F. C. Smith
Keyword(s):  
Limit State ◽  
Highway Bridges ◽  
Condition Assessment ◽  
Public Works ◽  
Reserve Capacity ◽  
Optimal Operating ◽  
Operating Profit ◽  
Bridge Condition Assessment ◽  
Potential Benefits ◽  
Operation Phase

<p>In recent years, an increasing number of private firms are involved in public works using the funding strategy of public-private partnerships (PPPs), especially for civil infrastructure projects such as highways and bridges. In this paper, a framework is proposed to quantify the potential benefits of condition assessment in the operation phase. The updated safety condition of highway bridges is introduced as a constraint of the profit optimization problem. The framework includes the following three steps. First, structural identification is carried out to identify parameter values of the bridge involved in the highway project. Then the reserve capacity under the relevant limit state is calculated based on the requirements of bridge design codes. The last step is to investigate the effects of reserve capacity on the optimal operating profit. This framework is applied to a highway flyover project in Singapore. The optimal operating profit based on quantified reserve capacity increases relative to the case without information of reserve capacity. This significant potential economic benefit associated with bridge condition assessment in the operation phase of toll highways.</p>

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