scholarly journals The Role of Control Devices of Distribution Automation in the Intelligence of Power Network to Reduce Outages and Improve Reliability

2015 ◽  
Vol 8 (35) ◽  
Author(s):  
Abolfazl Ghanbarzadeh ◽  
Khalil Banan Ali Abbasi
2013 ◽  
Vol 303-306 ◽  
pp. 1276-1279
Author(s):  
Hai Na Rong ◽  
Yan Hui Qin

Power network reconfiguration is an important process in the improvement of operating conditions of a power system and in planning studies, service restoration and distribution automation when remote-controlled switches are employed. This paper presents the use of a quantum-inspired evolutionary algorithm to solve the distribution network reconfiguration problem. The quantum- inspired evolutionary algorithm is the combination product of quantum computing and evolutionary computation and is suitable for a class of integer programming problems such as the distribution network reconfiguration problem. After the analysis and formulation of the distribution network reconfiguration problem, the effectiveness and feasibility of the introduced method is verified by a large number of experiments.


Author(s):  
Amel F. Boudjabi ◽  
Ahmed Bellaouar ◽  
Mohammed Lachi ◽  
Nadim El Wakil

Temperature variation phenomena observed inside the metallurgical tundish in the continuous casting is principally due to several factors, high temperature of the ladle metal jet, important thermal losses, heat transfer between molten steel and tundish walls and more still, in contact with the slag layer at bath surface and if necessary cooling or warming in refining composition operations. A numerical simulation using the CFD code “Fluent” is realised. Investigation of heat transfer—which has a great importance in the natural convection and the inclusions floating at slag surface—, is proposed. Results are presented for three arrangements of the tundish, where the interest and role of the control devices is improved.


2010 ◽  
Vol 28 (4) ◽  
pp. 698-704 ◽  
Author(s):  
David F. Ransohoff ◽  
Margaret L. Gourlay

Claims about the diagnostic or prognostic accuracy of markers often prove disappointing when “discrimination” found between cancers versus normals is due to bias, a systematic difference between compared groups. This article describes a framework to help simplify and organize current problems in marker research by focusing on the role of specimens as a source of bias in observational research and using that focus to address problems and improve reliability. The central idea is that the “fundamental comparison” in research about markers (ie, the comparison done to assess whether a marker discriminates) involves two distinct processes that are “connected” by specimens. If subject selection (first process) creates baseline inequality between groups being compared, then laboratory analysis of specimens (second process) may erroneously find positive results. Although both processes are important, subject selection more fundamentally influences the quality of marker research, because it can hardwire bias into all comparisons in a way that cannot be corrected by any refinement in laboratory analysis. An appreciation of the separateness of these two processes—and placing investigators with appropriate expertise in charge of each—may increase the reliability of research about cancer biomarkers.


Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2841
Author(s):  
 Chung-Jen Chou ◽  
Shyh-Biau Jiang ◽  
Tse-Liang Yeh ◽  
Chein-Chung Sun

To improve the reliability and energy efficiency of battery swapping, we constructed a battery power network system with active redundancies and with multiple battery management controllers (one in each newly developed smart redundant battery pack). Each pack is getting ready to assume the role of the major to coordinate direct safe mounting of the packs onto the power bus for load sharing or charging without the need for a direct current to direct current converter. This fault-tolerant architecture provides multiple backups in both management control and power supply. To verify this design, the mounting, insertion, and removal of the battery packs were executed during charging and discharging. Battery packs can be swapped on and off safely at any time regardless of their charging states. Battery packs can be direct safe mounted onto the power bus by a threshold algorithm. With each mount on event, the equivalent output energy conversion efficiency ranges from 98.3% to 99.2% throughout the transient. Moreover, when the major battery pack fails or gets removed, other battery packs can indeed assume the role of major safely. The reliability, energy efficiency, and safety of our system were verified.


10.28945/4606 ◽  
2020 ◽  
Author(s):  
Clara A. Nkhoma ◽  
Mathews Nkhoma ◽  
Susan Thomas ◽  
Nha Quoc Le

Aim/Purpose: This study will review the existing literature on the advantages and challenges associated with rubric design and implementation. The role of rubric as an authentic assessment instrument will also be discussed. Background: This study provides an overall understanding of ‘rubric design, the benefits and challenges of using rubrics, which will be useful for both practitioners and researchers alike. Methodology: A comprehensive literature review was carried out on rubric, educational assessment, authentic assessment and other related topics. Contribution: Different types of rubrics and essential elements to create a complete rubric for classroom effectiveness are reviewed from literature to aid researchers, students and teachers who are new to using and designing rubrics. For experienced rubric designers and users, this will be an opportunity for them to get reassurance from the literature regarding good practices of rubric usage. This project will also be of use to researchers working on rubrics. Findings: A rubric is not only an assessment tool useful for students in high-stakes exam but also an educational instrument supporting learners to select appropriate learning approaches, assisting teachers to design effective instruction strategies, and improve reliability and validity of assessment. Novice learners should begin with generic rubrics due to their simplicity. Meanwhile, a task-specific rubric is more useful to improve reliability and validity of large-scale assessment. Holistic rubrics are appropriate for assessment of learning and analytic rubrics are almost indispensable in student-centred classroom and assessment for learning. Recommendations for Practitioners: A rubric as an authentic assessment instrument is useful to enhance the reliability of authentic assessment. Moreover, other empirical results indicate that rubrics play an importance role in authentic assessment regardless of levels or disciplines. Recommendations for Researchers: Those carrying out research on rubrics, rubric design and authentic assessment will find this paper useful as a point of reference to inform their research. Impact on Society: The findings apply to both learners and instructors in terms of analyzing best practices when using rubrics. The paper highlights that there are three main factors that determine the effectiveness of a rubric in improving students’ performance: namely, the users’ perception, the design, and the purpose of using rubrics. Rubric designing variables should also be optimized based on reliable data and information about the target educational context. Armed with this information, instructors will be in a better position to optimise the learning experience of their students. Future Research: Systemic literature reviews with data analysis from both qualitative and quantitative findings should be carried out in the future to identify current trends and the role of rubrics in learning.


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