Ieej Transactions on Electrical and Electronic Engineering 

About: Ieej Transactions on Electrical and Electronic Engineering is an academic journal published by Wiley-Blackwell. The journal publishes majorly in the area(s): Computer science & Electric power system. It has an ISSN identifier of 1931-4973. Over the lifetime, 2639 publications have been published receiving 14326 citations. The journal is also known as: Electrical and electronic engineering & Institute of Electrical Engineers of Japan transactions on electrical and electronic engineering.

Recent progress in MEMS electret generator for energy harvesting

Abstract: Energy harvesting is a method by which energy naturally present in the environment is captured and then converted into electricity for use in low-power electronics. Among the various energy sources, structural vibration is believed to be useful for powering wireless sensors in various applications such as sensor network and structural health monitoring. In the present paper, after a brief introduction to electret materials and charging technologies, recent progress in microelectromechanical systems (MEMS) electret generators is reviewed. © 2011 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

Optimization of Train Speed Profile for Minimum Energy Consumption

Abstract: The optimal operation of railway systems minimizing total energy consumption is discussed in this paper. Firstly, some measures of finding energy-saving train speed profiles are outlined. After the characteristics that should be considered in optimizing train operation are clarified, complete optimization based on optimal control theory is reviewed. Their basic formulations are summarized taking into account most of the difficult characteristics peculiar to railway systems. Three methods of solving the formulation, dynamic programming (DP), gradient method, and sequential quadratic programming (SQP), are introduced. The last two methods can also control the state of charge (SOC) of the energy storage devices. By showing some numerical results of simulations, the significance of solving not only optimal speed profiles but also optimal SOC profiles of energy storage are emphasized, because the numerical results are beyond the conventional qualitative studies. Future scope for applying the methods to real-time optimal control is also mentioned. Copyright © 2010 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

Image-Based Crack Detection for Real Concrete Surfaces

Abstract: In this paper, we introduce a novel image-based approach to detect cracks in concrete surfaces. Crack detection is important for the inspection, diagnosis, and maintenance of concrete structures. However, conventional image-based approaches cannot achieve precise detection since the image of the concrete surface contains various types of noise due to different causes such as concrete blebs, stain, insufficient contrast, and shading. In order to detect the cracks with high fidelity, we assume that they are composed of thin interconnected textures and propose an image-based percolation model that extracts a continuous texture by referring to the connectivity of brightness and the shape of the percolated region, depending on the length criterion of the scalable local image processing techniques. Additionally, noise reduction based on the percolation model is proposed. We evaluated the validity of the proposed technique by using precision recall and receiver operating characteristic (ROC) analysis by means of some experiments with actual concrete surface images. Copyright © 2007 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

Current status of microplasma research

Abstract: Microscale plasmas of micrometer to millimeter range have been attracting much attention in recent years. Those microplasmas generally operate at high-pressure regions, including atmospheric pressure, and exhibit characteristics that differ from traditional plasmas at lower pressure regions in their plasma parameters and other parameters originating from their small dimensions. When those characteristics are well combined with the inherent properties of plasmas as reactive, light-emissive and conductive/dielectric media, there appear a variety of potential applications for nano-material syntheses, micromachining tools, microchemical analyses, photonic devices and biomaterial processing. In this article, the current status and perspective of microplasma research are reviewed from the viewpoints of plasma generation, diagnostics/simulations and new applications. © 2006 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

Primary study of spiral dynamics inspired optimization

Abstract: Logarithmic spiral phenomena are often appeared in nature. In this letter, we show that a logarithmic spiral can realize an effective strategy regarding the metaheuristics and propose a new two-dimensional metaheuristics called spiral optimization utilizing a feature of the logarithmic spiral. The simulation results for two-dimensional benchmark problems show the effectiveness and the potential of the proposed method. © 2010 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.