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2014 IEEE Conference on Computer Communications Workshops, INFOCOM WKSHPS 2014

作者： Sen, Arunabha Mazumder, Anisha Banerjee, Joydeep Das, Arun Compton, Randy Computer Science and Engineering Program School of Computing Informatics and Decision System Engineering Arizona State University Tempe AZ 85287 United States

ISBN: (纸本)9781479930883

The critical infrastructures of a nation including the power grid and the communication network are highly interdependent. Recognizing the need for a deeper understanding of the interdependency in a multi-layered network, significant efforts have been made by the research community in the last few years to achieve this goal. Accordingly a number of models have been proposed and analyzed. Unfortunately, most of the models are over simplified and, as such, they fail to capture the complex interdependency that exists between entities of the power grid and the communication networks involving a combination of conjunctive and disjunctive relations. To overcome the limitations of existing models, we propose a new model that is able to capture such complex interdependency relations. Utilizing this model, we provide techniques to identify the K most 'vulnerable' nodes of an interdependent network. We show that the problem can be solved in polynomial time in some special cases, whereas for some others, the problem is NP-complete. We establish that this problem is equivalent to computation of a fixed point of a multilayered network system and we provide a technique for its computation utilizing Integer Linear programming. Finally, we evaluate the efficacy of our technique using real data collected from the power grid and the communication network that span the Maricopa County of Arizona. © 2014 IEEE.

关键词： Complex networks

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Beyond connectivity-new metrics to evaluate robustness of networks

Beyond connectivity-new metrics to evaluate robustness of ne...

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International Conference on High Performance Switching and Routing

作者： Banerjee, Sujogya Shirazipourazad, Shahrzad Ghosh, Pavel Sen, Arunabha Computer Science and Engineering Program School of Computing Informatics and Decision System Engineering Arizona State University Tempe AZ 85281 United States

ISBN: (纸本)9781424484560

Robustness or fault-tolerance capability of a network is an important design parameter in both wired and wireless networks. Connectivity of a network is traditionally considered to be the primary metric for evaluation of its fault-tolerance capability. However, connectivity (G) (for random faults) or region-based connectivity R(G) (for spatially correlated or region-based faults, where the faults are confined to a region R) of a network G, does not provide any information about the network state, (i.e., whether the network is connected or not) once the number of faults exceeds (G) or R(G). If the number of faults exceeds (G) or R(G), one would like to know, (i) the number of connected components into which G decomposes, (ii) the size of the largest connected component, (iii) the size of the smallest connected component. In this paper, we introduce a set of new metrics that computes these values. We focus on one particular metric called region-based component decomposition number (RBCDN), that measures the number of connected components in which the network decomposes once all the nodes of a region fail. We study the computational complexity of finding RBCDN of a network. In addition, we study the problem of least cost design of a network with a target value of RBCDN. We show that the optimal design problem is NP-complete and present an approximation algorithm with a performance bound of O(log K + 4log n), where n denotes the number of nodes in the graph and K denotes a target value of RBCDN. We evaluate the performance of our algorithm by comparing it with the performance of the optimal solution. Experimental results demonstrate that our algorithm produces near optimal solution in a fraction of time needed to find an optimal solution. © 2011 IEEE.

关键词： Approximation algorithms

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Design and Development of Electric Motor Torque Meter Using Microcontroller 5

Design and Development of Electric Motor Torque Meter Using ...

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5th Research, Invention, and Innovation Congress: Innovative Electricals and Electronics, RI2C 2024

作者： Meesuk, Peerawat Nak-Udom, Natthaphong Phimyotha, Kittiphong Bansomdejchaopraya Rajabhat University Program of Electrical Engineering and Automation Control System Faculty of Engineering and Industrial Technology Bangkok10600 Thailand Bansomdejchaopraya Rajabhat University Program of Electromechanic Manufacturing Engineering Faculty of Engineering and Industrial Technology Bangkok10600 Thailand

ISBN: (纸本)9798331505998

This article presents the development of electric motor torque meter using microcontroller together with dynamometer process and application of light process to find out revolutions per minute (RPM) which torque is a variable that affects the effectiveness of electrical machine. A torque meter is, therefore, a tool that has an important role to work with mechanical part. The torque meter and RPM was tested and found that there is an error of torque measure at 13.74 percent and found that the torque has higher errors when it exceeds 2 N-m and there is an error of RPM at 5.36 percent. © 2024 IEEE.

关键词： Torque meters

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Virtual instrumentation interfaces for real-time control and display of electric machine drives

Virtual instrumentation interfaces for real-time control and...

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2008 ASEE Annual Conference and Exposition

作者： Sundaram, Ramakrishnan Mak, Fong Tandle, Sunil Gannon University Department of Electrical and Computer Engineering Gannon University Gannon/GE Transportation Embedded System Graduate Program

No abstract available

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Secure and Effective Reengineering Information system and Business Processes of Cross-Border Control between the Republic of Indonesia and the Republic Democratic of Timor-Leste 6

Secure and Effective Reengineering Information System and Bu...

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6th International Conference on Cyber and IT Service Management, CITSM 2018

作者： Fransiskus Tjiptabudi, M.H. Igon, Skolastika Siba Bernardino, Raul Muharram, Asep T. Study Program Information System STIKOM Uyelindo Kupang Indonesia Informatics Engineering Department Pamulang University Banten Indonesia

ISBN: (纸本)9781538654330

Technology disruption had boost every sector to adapt and to adjust an infrastructure and system according to the specific needs and business process which can improve an effective operation for the decision making processes and reporting systems within the workflow, social capability, data integrity, and open standard frameworks. Current administration process for capturing cross-border (traveler) in terrestrial immigration posts are used a conventional or handwriting;-passport information is collected on arrival or departure immigration cards or use of ' Pas Lintas Batas' (PLB) special cards for the inhabitant was living alongside both countries border. It is quite difficult to organize cross-border cards for the archiving, filing system, retrieve data, and recapitulate numbers of cross borders for reporting purposes such as individual activities per cities and aims, daily, weekly, and monthly reports. The research will use waterfall with subprojects method within the mentioned modern framework. The aim of this research is to produce an effective and secure information system application prototype for immigration authorities, especially for terrestrial border control system. © 2018 IEEE.

关键词： Information systems

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Analysis of the life cycle environmental impact reductions of remanufactured turbochargers

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Journal of Remanufacturing 2023年第2期13卷 187-206页

作者： Lee, Jong-Hyo Kang, Hong-Yoon Kim, Young-Woon Hwang, Yong Woo Kwon, Soon-Gil Park, Hee-Won Choi, Ji-Woo Choi, Hwan-Ho Program in Circular Economy Environmental System Inha University Incheon South Korea Department of Environmental Engineering Inha University Incheon South Korea

Recently, remanufacturing approach/technology, which includes a series of the processes of disassembling, cleaning, inspecting, repairing/reconditioning, reassembling components for resale, is becoming more popular as companies look for a way to combat the current climate crisis, and as it allows companies to reduce environmental impacts and to save energy and resources. This study analyzed the reduction effect of six environmental impacts and the savings effect of energy and resources by turbocharger remanufacturing compared to its newly manufacturing using a life cycle assessment (LCA) methodology. The results show that the most significant benefit of the turbocharger remanufacturing related to environmental impacts was the global warming potential (GWP), which could be reduced by 52.2%, followed by the abiotic depletion potential (ADP), terrestrial ecotoxicity potential (TETP), human toxicity potential (HTP), freshwater aquatic ecotoxicity potential (FAETP) and marine aquatic ecotoxicity potential (MAETP) which could be reduced by 51.9%, 44.8%, 44.2%, 42.6%, and 36.7%, respectively. Also, its resource saving could be obtained from 21.7 to 73.5% depending on the type of resources. Furthermore, turbocharger remanufacturing offered a significant energy saving of 83.9%. The results obtained from this study could be used for national policy-making to a net-zero carbon transition. © 2023, The Author(s).

关键词： Energy/Resources savings Environmental impacts Life Cycle Assessment (LCA) Turbocharger remanufacturing

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Calibration of 100 A/50mA instrument current transformer energy meter using bisection method 2

Calibration of 100 A/50mA instrument current transformer ene...

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2nd IEEE International Conference on Innovative Research and Development, ICIRD 2019

作者： Bimantoro, Renardi Ardiya Rahardjo, Amien Husnayain, Faiz Aryani, Dwi Riana Hudayala, Chairul Universitas Indonesia Department of Electrical Engineering Faculty of Engineering Depok16424 Indonesia Energy System Engineering Master Study Program Faculty of Engineering Universitas Indonesia Depok16424 Indonesia

ISBN: (纸本)9781728128252

Instrument current transformers (CTs) are widely used in various types of electrical energy measurement. Eddy current losses, losses of hysteresis, a saturation of CT, and inevitable flux leaks could lead to errors including errors in the ratio and phase angle. Improving the accuracy of CT measurement could be achieved in many ways. In this study, a bisection calibration method to overcome the error by implementing correction factor integrated with the Arduino codes is investigated. The reliability of this system has been tested in two different situations, which are a constant and variable load experiments. The result shows that the readout of the developed instrument using 100 A/50mA CT could achieve the deviation value of less than 2%, confirming the excellence accuracy of energy meter. © 2019 IEEE.

关键词： Electric instrument transformers

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Prediction of power transformers lifetime using thermal modeling analysis 2

Prediction of power transformers lifetime using thermal mode...

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2nd IEEE International Conference on Innovative Research and Development, ICIRD 2019

作者： Afifah, Sarah Nainggolan, Jannus Maurits Wibisono, Gunawan Hudaya, Chairul Universitas Indonesia Departement of Electrical Engineering Faculty of Engineering Depok16424 Indonesia Energy System Engineering Master Study Program Faculty of Engineering Universitas Indonesia Depok16424 Indonesia

ISBN: (纸本)9781728128252

Transformer is one of the main components in distribution system of electrical power system towards the consumers, thereby any damage to the transformers will hinder the distribution of electricity towards the consumers, and in turn will make the SAIDI and SAIFI levels go up. High temperature in transformers can cause degradation in the insulation of transformers which in turn will cause failure in transformers. When the temperature in winding reaches or goes beyond the limit of 110°C, a degradation in insulation will start happening and the remaining life of transformers will decrease. Damage in transformers will cause disturbance in electrical power system and result in a major economic loss. Before damages occur, transformers need to be changed up until it is deemed to be no longer efficient, this can be done by replacing the transformer that is about to be damaged. To predict when a transformer is about to break, a calculation is made based on thermal modelling according to IEEE Std C57.91-1995 with its most prominent variable being Hot Spot Temperature (HST). HST is obtained by MATLAB programming using Annex G of IEEE Std. C57.91-1995. By obtaining HST, thus the remaining lifetime of transformers can be predicted. This study analysed the effect of loading, hot-spot temperature, and ambient temperature on the remaining lifetime of a transformer. The higher those three factors, the quicker the transformer will break, with loss of life percentage increasing exponentially. The highest loading, hot spot temperature, and ambient temperature given in this research gives percent loss of life of 0.0888332%, 0.0193394%, 0.020753% respectively. © 2019 IEEE.

关键词： Power transformers

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Gaining operational approval for use for GPS III in the national airspace system

Gaining operational approval for use for GPS III in the nati...

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Proceedings of the 61st Annual Meeting of The Institute of Navigation

作者： Hecht, Myron Maine, Kristine Yinger, Colleen Aerospace Corp. El Segundo CA Aerospace Corporation GPS III Program Aerospace Corporation GPS System Engineering Program Office AIAA Aerospace Corporation GPS Joint Program Office

The GPS Joint program Office (JPO) is currently evaluating the feasibility of providing certified aviation navigation services in the GPS III constellation for oceanic, en-route, terminal, departure, and arrival operations for military and civil users. Aviation operations currently require that the GPS Signal in Space (SIS) be augmented using space-based, aircraft-based, or ground-based systems. This paper identifies the applicable aviation Regulations, Advisory Circulars, and industry standards that will govern the approval process and the resultant requirements and criteria together with an approach that the GPS III program is using to achieve approval for use by military and civil aircraft in the U.S. National Airspace system. An approach is described to (a) identify the processes and artifacts to meet the requirements in the certification basis;and (b) ensure that the quality of the execution of these artifacts during development is sufficient for certification and approval by a competent certification authority for civil aviation.

关键词： Global positioning system

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Localization Algorithms for Drones in a Wireless Communication Environment with Presence of Data Missing 23

Localization Algorithms for Drones in a Wireless Communicati...

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23rd International Conference on Control, Automation and systems, ICCAS 2023

作者： Kim, Sin Shin, Sung Ko, Nak Yong You, Sung Hyun Chosun University Department of Electronic Engineering Gwangju61452 Korea Republic of Interdisciplinary Program in IT-Bio Convergence System Department of Electronic Engineering Korea Republic of

ISBN: (纸本)9788993215274

Drones are widely used in industries because drones perform tasks in various environments. Drones are highly utilized because drones are not affected by ground conditions. Estimating the position of the drone is important for the successful completion of the missions that are assigned to the drone. In wireless communication environments, data missing often occurs between the anchors serve as the transmitter and the drone-attached tag serves as the receiver. In this paper, we propose a localization algorithm that can accurately estimate the location of the drone in the case of data missing. The proposed algorithm can estimate the position of the drone using the residuals of the predicted measurements in the case of data missing. The proposed algorithm aimed to estimate the position of the drone in the case of data missing using distance information between the anchors and the drone-attached tag and verified the performance of the proposed algorithm through simulation. © 2023 ICROS.

关键词： Drones

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