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Due to the aging of electric power facilities and the increase in electric power demand, the operation and maintenance of electric power facilities is becoming an important issue. Currently, power Oil-Filled(OF) cables for underground system in South Korea have an average lifetime of 20 years and cables used for more than 25 years are about 20%. In this paper, the lifetime of Oil-Filled(OF) cables...
High precision spectroscopic measurement using spectral hole burning technique with ultra-stable laser on Eu3+ : Y2SiO5 can be used to measure very small deformations in the crystal such as the ones arising due to quantum motion of nanoresonators. We present an experiment aiming at such high precision characterization.
A multi flux permanent-magnet machine using radial and axial flux is presented in this paper. With both of flux and additional magnetic cores, the air gap flux density and power density are increased. For the analysis and design of the proposed three-dimensional (3-D) magnetic structure, a two-dimensional (2-D) analysis method is applied. The accuracy of the applied analysis method verified via the...
Lately, as the desire for comfortable and pleasant living environments has grown because of improvements in the standard of living, interest in the reduction of vibration and noise of electric appliances has increased. In the case of washing machines, in particular, the drum of the machine rotates at a high speed during the dehydration mode, and thus, the problem of vibration arises. The vibration...
The purpose of this study was to investigate the effects of treadmill training (TT) with functional electrical stimulation (FES) applied on the gluteus médius (GM) and tibialis anterior (TA) muscles on gait and balance performance in individuals with hemiparetic stroke. Thirty-six participants who had chronic hemiparetic stroke, were recruited in this study, and were randomly distributed into three...
A beam scannable 4×4 patch array antenna using the tunable metamaterial (MTM) phase shifter has been designed at S-band. The phase shifter consists of four MTM unit cell composed of a series variable capacitor and a shunt tunable inductor. The inductor is realized by a variable capacitor and quarter wave impedance transformer. The phase shifting range of the phase shifter is 280° (from −87° to 193°)...
We introduce BAG, the Berkeley Analog Generator, an integrated framework for the development of generators of Analog and Mixed Signal (AMS) circuits. Such generators are parameterized design procedures that produce sized schematics and correct layouts optimized to meet a set of input specifications. BAG extends previous work by implementing interfaces to integrate all steps of the design flow into...
We define the requirement of the visible-light communication (VLC) transceiver for bidirectional high-speed and short-range communications and examine its practicability. VLC transceivers were implemented with edge-emitting laser diode and silicon photo diode, designed primarily to operate in a full duplex mode at 120 Mbit/s. The design of an optical antenna was also included in this paper, which...
The vertically aligned carbon nanotube (CNT)-bundle is utilized as a mechanical buffer for inertial micro-switch to extend the contact time and therefore to obtain reliable and stable output signals. The CNT bundles are directly synthesized on two facing surfaces of both movable- and stationary electrodes by patterning the catalyst on released microstructures and the following thermal chemical vapor...
Two online adaptation models tuning the flowrate of cooling water in plate mill are developed based on the feedback and feedforward control algorithm. In the feedback control based model, a multiplication factor is adopted which is composed of three adaptation coefficients. The calculations of the three coefficients are designed taking process variations into account. After tested on an offline simulator,...
We have extracted the exact position (xT and yT) and energy of a trap in tunnel oxide which induces RTN by considering the channel resistances of pass cells in floating gate NAND flash memory string. Moreover, the trap position (zT) along the channel width direction was also extracted by using an interference between adjacent bit-lines.
In this paper, we describe the performance elements used in our 28nm bulk devices with the gate first high-k/metal gate scheme for high performance applications. By using the innovative stressor integrations including improved stress memory technique (SMT), optimized embedded SiGe process and dual stress liner, Ieff of ~540/360 uA/um have been obtained for NMOS and PMOS respectively with the gate...
AC-DC transfer standard and micro-potentiometer are widely used for AC voltage standard at low level. Input impedance and 50-Ω load dependency of the standard are discussed for the ac voltage application below 200 mV and 1 MHz. The load dependency of the unit reaches 385 μV/V at 1 MHz, and this loading error should be corrected when calibrate the 50-Ω AC source using the standard.
We describe and analyze a magnetic bearing built using a permanent magnet assembly. The magnetic bearing comprises a conical female magnet assembly and a rotationally symmetric identically polarized male piece. The opposition of the two parts produces a force between them which tends to hold them apart and aligned along an axis of symmetry. We describe the bearing and its use in generating an isin-axle,...
Recently, we have developed high precision carbon-interspaced antiscatter grids to be suitable for digital radiography (DR) by adopting a precise sawing process. For systematic evaluation of the grid performance, we prepared several sample grids having different grid frequencies (4.0 to 8.5 lines/mm) and grid ratios (5:1 to 10:1) and established a well-controlled test condition based upon the IEC...
Voltage ramp dielectric breakdown (VRBD) and time-dependent dielectric breakdown (TDDB) characteristics of ~40nm-wide Cu/SiO2 interconnect dielectrics were investigated. The addition of a SiH4 treatment before capping SiN deposition led to more uniform breakdown fields, and better TDDB performance. The integration of a Ti-based barrier resulted in the best uniformity of breakdown fields, and a dramatic...
Electrical low-frequency stimulation (LFS) of spinal afferents induces long-term depression (LTD) of nociceptive processing in rodents. LTD and its parameters in man are largely unknown. This study aimed to obtain the most effective design in man by varying stimulation frequency (0.5, 1, 2 Hz), number of pulses (300, 600, 1200), stimulation intensity related to pain threshold (Ip) (1-Ip, 2-Ip, 4-I...
We compared WSix/WN and Ti/WN diffusion barriers for tungsten dual polymetal gate (W-DPG) application, in terms of device performance and gate oxide reliability. WSix/WN diffusion barrier shows degradation of gate oxide, which is found to be due to the B-N dielectric formation and subsequent breakdown of diffusion barrier. Relatively, Ti/WN diffusion barrier shows excellent device performance in terms...
A WDM-PON with 50-GHz channel spacing employing RSOA-based spectrum sliced sources is presented. Colorless operations over 32 DWDM channels are demonstrated from -10 to 80 ??C in 155-Mb/s transmissions over 10 km.
Volume navigation is the interactive exploration of volume data sets by "flying" the view point through the data, producing a volume rendered view at each frame. The authors present an inexpensive perspective volume navigation method designed to run on a PC platform with accelerated 3D graphics hardware. They compute perspective projections at each frame, allow trilinear interpolation of...
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