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Effect of Nitrogen Fine Bubbles on Negative Lightning Impulse Breakdown Voltage and Discharge Propagation Characteristics of Pure Water

Effect of Nitrogen Fine Bubbles on Negative Lightning Impuls...

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2023 International Symposium on electrical Insulating Materials, ISEIM 2023

作者： Takamura, Norimitsu Araoka, Nobutaka Eguchi, Taiki Matsuda, Mikiya Wang, Douyan Namihira, Takao Hanai, Masahiro Department of Electrical Engineering Fukuoka University Fukuoka Japan Dept. of Comput. Sci. & Electr. Eng. Grad. Sch. Sci. Tech.. Kumamoto Univ Kumamoto Japan Technical Division Kumamoto University Kumamoto Japan Institute of Industrial Nanomaterials Kumamoto University Kumamoto Japan

ISBN: (纸本)9784886864376

Authors focused on pure water as an ultimate liquid insulating material that is harmless to the environment and has the potential to be used as an alternative to electrical insulating oils. Since the part of insulation properties of pure water, such as volume resistivity and dielectric dissipation factor, are inferior to that of insulating oils, it needs to be improved. It has already been reported that nitrogen fine bubbles (N2 FBs) have the potential of increasing the volume resistivity of pure water. In this paper, authors report the experimental results related to the effect of N2 FBs on negative lightning impulse breakdown voltage (NLI BDV) and discharge propagation characteristics of pure water. Some of the experimental results suggest that N2 FBs may not adversely affect the NLI BDV, discharge current, and time from the camera trigger to strong light emission occurring due to spark discharge of pure water. © 2023 The Institute of electrical Engineers of Japan.

关键词： Nitrogen

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Effect of Nitrogen Fine Bubbles on Negative Lightning Impulse Breakdown Voltage and Discharge Propagation Characteristics of Pure Water

Effect of Nitrogen Fine Bubbles on Negative Lightning Impuls...

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International Symposium on electrical Insulating Materials

作者： Norimitsu Takamura Nobutaka Araoka Taiki Eguchi Mikiya Matsuda Douyan Wang Takao Namihira Masahiro Hanai Department of Electrical Engineering Fukuoka University Fukuoka Japan Dept. of Comput. Sci. & Electr. Eng. Grad. Sch. Sci. Tech Kumamoto Univ. Kumamoto Japan Technical Division Kumamoto University Kumamoto Japan Institute of Industrial Nanomaterials Kumamoto University Kumamoto Japan

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Data-Intensive Routing in Delay-Tolerant Networks

Data-Intensive Routing in Delay-Tolerant Networks

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IEEE Annual Joint Conference: INFOCOM, IEEE computer and Communications Societies

作者： Kazuya Sakai Min-Te Sun Wei-Shinn Ku Dept. of Electrical Eng. and Comput. Sci. Tokyo Metropolitan University 6-6 Asahigaoka Hino Tokyo Japan Department of Computer Science and Information Engineering National Central University Taoyuan Taiwan Department of Computer Science and Software Engineering Auburn University Auburn Alabama

Mobile users and wireless devices are now the sources of a large volume of data. In such data-intensive mobile and wireless comput.ng systems, delay-tolerant network (DTN) routing plays a critical role in data routing, dissemination, and collection. In this paper, we first introduce a new routing problem in DTNs - data-intensive routing - where data transmitted from one node to another is very large with respect to the size of data which can be transmitted in a single contact and available buffer size at relay nodes. In the proposed opportunistic path model, the contact frequency, contact duration, and buffer constraint are all integrated into a single routing metric. Then, we design the data-intensive routing (DIR) protocol where the path with the highest bottleneck link capacity is defined as the path weight. In addition, we propose the advanced DIR (A-DIR) protocol which focuses on the probability that the last message block will be delivered to its destination within the time constraint. Both the DIR and A-DIR protocols forward messages to better relays or to their destinations based on a greedy strategy with the proposed path metric. Simulations using real mobility traces demonstrate that the proposed DIR and A-DIR protocols achieve their design goals.

关键词： Routing Routing protocols Relays Measurement Wireless communication Buffer storage

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Context-Aware, Accurate, and Real Time Fall Detection System for Elderly People

Context-Aware, Accurate, and Real Time Fall Detection System...

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International Conference on Semantic comput.ng

作者： Fadi Muheidat Lo'ai Tawalbeh Harry Tyrer Department of Electrical and Computer Engineering University of the Pacific (UOP) California USA Comput. Eng. Dept. Umm ALQura Univ. Makkah Saudi Arabia Department of Electrical Engineering and Computer Science University of Missouri Columbia Missouri USA

With all these smart devices around us, and the spread of the Internet and emerging technologies, our life became easier and busier. The un-controlled excessive use of the mobile applications and social media made many of the people around the world feel they are alone, and socializing with electronic devices rather than human beings. This problem is more sever when it comes to the elderly people who are already in excessive need for healthcare and socializing. In this research, we present a Context-aware and private real-time fall detection system (FDS) for elderly people. The proposed system consists of sensor pad placed under a carpet; the electronics reads walking activity to provide an automated health monitoring and alert system. We extended the functionalities of the smart carpet to improve its ability to detect falls, alert health care personnel, by providing a real-time, long-term access, and monitoring event system. The sensed data is stored in the cloud, and analyzed using data mining tools to enhance the system accuracy in detecting falls and monitor elderly people activities. The user can obtain these results and make decisions by accessing the cloud through his/her mobile devices and in real time manner. Results showed that our system detects falls using comput.tional intelligence techniques with 96.2% accuracy, 95% sensitivity and 85% Specificity.

关键词： Cloud comput.ng Real-time systems Mobile handsets Senior citizens Data mining Testing Medical services

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Convolutional Neural Networks as Means to Identify Apposite Sensor Combination for Human Activity Recognition

Convolutional Neural Networks as Means to Identify Apposite ...

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IEEE International Conference on Connected Health: Applications, Systems and engineering Technologies (CHASE)

作者： Muhammad U. S. Khan Assad Abbas Mazhar Ali Muhammad Jawad Samee U. Khan Dept. of Comput. Sci. COMSATS Univ. Islamabad Islamabad Pakistan Department of Computer Science COMSATS University Islamabad Pakistan Department of Electrical Engineering COMSATS University Islamabad Pakistan Department of Electrical and Computer Engineering North Dakota State University Fargo ND USA

ISBN: (纸本)9781538672075;9781538672068

Accurate classification of human activities is significant particularly for remote monitoring of patients requiring orthopedic treatment and therapies in case of various injuries. Previously, we presented a Local Energy-based Shape Histogram (LESH) based approach that considers the energy expenditure for various activities and differentiates among the activities on the basis of energy level. Although the approach effectively recognized various activities, the recognition accuracy for the activities, such as walking forward, walk forward left circle, and walk forward right circle was significantly low. In this paper, we present a Convolutional Neural Network (CNN) based approach for recognizing human activities with sufficiently high accuracy. The experiments are conducted on the Wearable Action Recognition Database (WARD) dataset. Experimental results demonstrate that the CNN based approach (in general) not only achieves high recognition accuracy for all of the activities but also performed extremely well for the activities requiring frequent inter-posture transitions. Another important contribution of this research is that the CNN based approach is capable of finding a single combination of sensors to identify thirteen different activities with sufficiently high accuracy.

关键词： Activity recognition Feature extraction Convolution Convolutional neural networks Biomedical monitoring computer science

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Performance Analysis of Single Carrier Coherent and Noncoherent Modulation under I/Q Imbalance

Performance Analysis of Single Carrier Coherent and Noncoher...

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IEEE Conference on Vehicular Technology (VTC)

作者： Bassant Selim Sami Muhaidat Paschalis C. Sofotasios Bayan S. Sharif Thanos Stouraitis George K. Karagiannidis Naofal Al-Dhahir Department of Electrical and Computer Engineering Khalifa University of Science and Technology Abu Dhabi United Arab Emirates Dept. of Electr. & Comput. Eng. Khalifa Univ. of Sci. & Technol. Abu Dhabi United Arab Emirates Department of Electrical and Computer Engineering Aristotle University of Thessaloniki Thessaloniki Greece University of Texas at Dallas Richardson TX US

In-phase/quadrature-phase Imbalance (IQI) is considered a major performance-limiting impairment in direct-conversion transceivers. Its effects become even more pronounced at higher carrier frequencies such as the millimeter-wave frequency bands considered for 5G systems. In this work, we quantify the effects of IQI on the performance of different modulations under multipath fading channels. This is realized by developing a comprehensive framework for the symbol error rate (SER) analysis of coherent phase shift keying (PSK), noncoherent differential phase shift keying (DPSK) and noncoherent frequency shift keying (FSK) under IQI effects. In this context, the moment generating function of the signal-to-interference-plus-noise-ratio is first derived for single-carrier systems suffering from transmitter (TX) IQI only, receiver (RX) IQI only and joint TX/RX IQI. Capitalizing on this, we derive analytic expressions for the SER of the different modulation schemes considered. These expressions are corroborated with simulation results and they provide insights into the dependence of IQI on the system parameters. We further demonstrate that, while in some cases, IQI can cause a slight degradation of the SER performance and, hence, it can be neglected, in other cases it should be compensated in order to achieve a reliable communication link.

关键词： Signal to noise ratio Interference Radio frequency Fading channels Frequency shift keying Error analysis Baseband

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Ergodic Capacity Analysis of Wireless Transmission over Generalized Multipath/Shadowing Channels

Ergodic Capacity Analysis of Wireless Transmission over Gene...

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IEEE Conference on Vehicular Technology (VTC)

作者： Paschalis C. Sofotasios Seong Ki Yoo Sami Muhaidat Simon L. Cotton Michail Matthaiou Mikko Valkama George K. Karagiannidis Dept. of Electr. & Comput. Eng. Khalifa Univ. of Sci. & Technol. Abu Dhabi United Arab Emirates Institute of Electronics Communications and Information Technology Queen's University of Belfast Belfast UK Department of Electrical and Computer Engineering Khalifa University of Science and Technology Abu Dhabi United Arab Emirates Institute for Communication Systems University of Surrey Guildford UK Department of Electronics and Communications Engineering University of Technology Tampere Finland Department of Electrical and Computer Engineering Aristotle University of Thessaloniki Thessaloniki Greece

Novel composite fading models were recently proposed based on inverse gamma distributed shadowing conditions. These models were extensively shown to provide remarkable modeling of the simultaneous occurrence of multipath fading and shadowing phenomena in emerging wireless scenarios such as cellular, off-body and vehicle-to-vehicle communications. Furthermore, the algebraic representation of these models is rather tractable, which renders them convenient to handle both analytically and numerically. Based on this, the present contribution analyzes the ergodic capacity over the recently proposed κ-μ/inverse gamma composite fading channels, which were shown to characterize excellently multipath fading and shadowing in line-of-sight communication scenarios, including realistic vehicular communications. Novel analytic expressions are derived which are subsequently used in the analysis of the corresponding system performance. In this context, the offered results are compared with respective results from cases assuming conventional fading conditions, which leads to the development of numerous insights on the effect of the multipath fading and shadowing severity on the achieved capacity levels. It is expected that these results will be useful in the design of timely and demanding wireless technologies such as wearable, cellular and inter-vehicular communications.

关键词： Fading channels Numerical models Analytical models Wireless communication Shadow mapping Mathematical model Finite wordlength effects

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Information-based measure for influence characterization in dynamical systems with applications

Information-based measure for influence characterization in ...

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American Control Conference

作者： Umesh Vaidya Subhrajit Sinha Department of Electrical & Computer Engineering Iowa State University Ames 50011 USA Dept. of Electr. & Comput. Eng. Iowa State Univ. Ames IA USA

ISBN: (纸本)9781467386838

In this paper, we introduce novel measure based on information to define influence in a dynamical system. The objective is to determine how a particular state (or a linear combination of states) in dynamical system influence or participate in the dynamics of another state (or a linear combination of states). An important parameter in determining the influence is the definition of the influence. We propose information or entropy-based measure for influence characterization. In particular, state x is said to influence or participate in the dynamics of state y, if the evolution of state x results in change in entropy or information content of state y. This work builds on our prior work on formalism for information transfer in dynamical network [1]. We discuss the applications of the developed framework for influence characterization in power system and social network. For power system, the proposed influence measure is used for the comput.tion of participation factor of individual generator to the inter-area oscillation mode of the power system. For social network application, we use a Twitter network for influence characterization. The influence measure is used to understand the distribution of influential nodes and for influence-based clustering of the Twitter network.

关键词： Entropy Social network services Generators Atmospheric measurements Particle measurements Power system dynamics Social network services Particle measurements atmospheric monitoring Power system dynamics dynamos entropy DYNAMICAL SYSTEMS power systems Social Media Linear Combination Social Networks participation factor

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Battery Connected DFIG Wind System Analysis for Strong/Weak Grid Scenarios

Battery Connected DFIG Wind System Analysis for Strong/Weak ...

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IEEE Green Technologies Conference (IEEE-Green)

作者： Anitha Sarah Subburaja Nimat Shamim Stephen B. Bayne Sch. of Eng. & Comput. Sci. West Texas A&M Univ. Canyon TX USA Department of Electrical & Computer Engineering Texas Tech University Lubbock Texas

The paper helps to understand the performance of the grid with battery and doubly-fed induction generator (DFIG) wind turbines when operating in a weak grid scenario with a low short circuit ratio (SCR). The concept will analyze the performance of the grid with battery connected DFIG both in steady state and transient scenario. The grid can be represented as a Thevenin equivalent circuit and is rated at 12.5 kV. A battery system and a wind system are connected at the point of common coupling (PCC). The battery system being modeled in PSCAD software is rated at 1 MW/1 MWh and the wind system model is rated at 2 MW. The grid has been characterized and analyzed based on two categories: strong grid and weak grid. A grid is considered to be weak when the flow of active and reactive power in the network causes a significant amount of voltage fluctuation at the point of common coupling. A grid is considered to be strong when the grid is stable with allowable nominal deviations with voltage and frequency. The strength of the grid can be measured by taking the ratio of grid's short circuit power with grid nominal power.

关键词： Batteries Wind turbines Thyristors Reactive power Couplings Transient analysis Wind farms

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Robust decentralized voltage control of DC-DC converters with applications to power sharing and ripple sharing

Robust decentralized voltage control of DC-DC converters wit...

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American Control Conference

作者： Mayank Baranwal Srinivasa M. Salapaka Murti V. Salapaka Department of Mechanical Science and Engineering University of Illinois at Urbana-Champaign 61801 USA Department of Electrical and Computer Engineering University of Minnesota Minneapolis 55455 USA Dept. of Electr. & Comput. Eng. Univ. of Minnesota Minneapolis MN USA

ISBN: (纸本)9781467386838

This paper addresses the problem of output voltage regulation for multiple DC-DC converters connected to a grid, and prescribes a robust scheme for sharing power among different sources. Also it develops a method for sharing 120 Hz ripple among DC power sources in a prescribed proportion, which accommodates the different capabilities of DC power sources to sustain the ripple. We present a decentralized control architecture, where a nested (inner-outer) control design is used at every converter. An interesting aspect of the proposed design is that the analysis and design of the entire multi-converter system can be done using an equivalent single converter system, where the multi-converter system inherits the performance and robustness achieved by a design for the single-converter system. Another key aspect of this work is that the voltage regulation problem is addressed as a disturbance-rejection problem, where unknown load current is viewed as an external signal, and thus, no prior information is required on the nominal loading conditions. The control design is obtained using robust optimal-control framework. Case studies presented show the enhanced performance of prescribed optimal controllers.

关键词： Voltage control Control design Robustness DC-DC power converters Uncertainty Load modeling Inverters Voltage regulation DC-DC power convertors design control Load modeling Inventors DC converter ripples Robustness DC to DC converters output voltage regulation DC power supply

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