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The operation of electric arc furnaces (EAFs) with drastic and random voltage-current characteristics creates considerable power quality problems in the connected power network. Because of the nonlinear behaviors of the EAF loads during operations, serious voltage fluctuations have been observed at busses that connect the substation transformer and cause frequent operations of the on-load tap changer...
This paper presents a novel non-invasive micromanipulation technique where a microrobot swimming in a three-dimensional space through electromagnetic actuation manipulates micro-objects using an acoustically oscillating bubble attached on the microrobot as a grasping tool in an aqueous environment. The concept of the micromanipulation method is experimentally proved along with studying both electromagnetic...
A time-to-market of mobile application software is usually very short and it causes unstructured mobile application software. In this paper, we defined a common architecture for mobile application software which is named as Application Framework to support agile software development. The framework is defined following PIM (Platform Independent Model) in MDD (Model Driven Development) to satisfy the...
The objective of this study was to improve measurement methods and detection sensitivity in partial discharges. Using a capacitive foil sensor to detect abnormal signals is normally applied to diagnose partial discharges in ultra high voltage sites. This study applied an FSA (Foil Sensor Array) method that improved the structural characteristics of a conventional foil sensor. Furthermore, this study...
This paper investigated the chemical, mechanical, and structural properties of carbon nanotubes by altering their contents in order to be used as component parts for semiconductive shields used in underground power transmission cables. A multi luminescence spectrometer MLA-GOLDS was used to investigate the chemical properties of specimens. In addition, a density meter EW-200SG was used to investigate...
The robust controller design based on the minimization of the H/sup 2/-norm of a mixed sensitivity function is considered. Two weighting functions and a weighting factor are introduced in the control design to trade off between feedback properties in different frequency ranges. By working in the discrete Fourier transform (DFT) domain, we convert the original H/sup 2/-norm minimization problem into...
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