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In this paper, we present an energy harvesting device which generates power from low frequency vibration using a magnetoelectric laminate composite and a springless spherical permanent magnet as a proof mass. The spherical permanent magnet inside a channel transforms an external vibration into time varying magnetic field applied to the magnetoelectric transducer. The magnetoelectric laminate composite...
Highly intense surface-enhanced Raman scattering (SERS) is featured as label-free non-destructive detection of biochemical molecules at extremely low concentration. Localized surface plasmon resonance (LSPR) enhances SERS signals by amplifying both the excitation and scattering process. However, aligning molecules near the hotspots of SERS substrate is still challenging to reach stable preconcentration...
The criminal justice system in the greater Albemarle-Charlottesville area faces a number of challenges common to many communities, including frequent overcrowding at the regional jail and data systems that obstruct analysis needed to identify causes of and remedies for overcrowding. The Community Criminal Justice Board (CCJB) would like to make evidence-based decisions, but doing so requires analysis...
In this study, effect interfacial bonding strength on pattern density was evaluated. The Silicon oxide(SiO2) on parallel patterned Cu lines wafer can be removed by using a solution of buffered oxide etch and sulfuric acid (BOE/H2SO4) to improve the bonding quality of Cu-Cu pattern direct bonds. Two 8-inch Cu wafers were bonded at 400°C via the thermocompression method. The interfacial adhesion energy...
We analyze the impact of oxide thickness variations on hot-carrier degradation. For this purpose, we develop an analytical approximation of our hot-carrier degradation (HCD) model. As this approximation is derived from a physics-based model of HCD, it considers all the essential features of this detrimental phenomenon. Among them are the interplay between single- and multiple-carrier mechanisms of...
Stable water supply to turbine system is essential requirement for small hydro power system using waste cooling water. Complex flow pattern in water channel is expected to be stable with overflow discharge. For reliable hydro power system, detailed analysis for flow characteristics is required to identify proper design parameters. In this study, small overflow over sluice is proposed to have stable...
Wind power generation system is a promising area of application of a superconducting synchronous generator (SCSG). A voltage sourced frequency converter connected to the stator winding of the SCSG and a DC-DC converter for the exciting current are needed for wind energy conversion. This paper describes the operation and control scheme of a superconducting wind power generation system (SCWPGS). The...
One often encounters the curse of dimensionality in the application of dynamic programming to determine optimal policies for controlled Markov chains. In this paper, we provide a method to construct sub-optimal policies along with a bound for the deviation of such a policy from the optimum via a linear programming approach. The state-space is partitioned and the optimal cost-to-go or value function...
A Solar eclipse event occurred on 22 July 2009 over South Korean Peninsula with a maximum obscuration of ∼84% has been investigated to discuss the variations in the mid-latitude ionosphere. Study of solar eclipse effect on the different ionospheric regions (espcially D-region) has been limited till today, although there is a few studies concentrated on the electron density variations and GPS TEC measurements...
We investigate the low frequency noise (LFN) behaviors of the amorphous indium-gallium-zinc oxide (a-IGZO) thin film transistors (TFTs) under light illumination. The LFNs are measured after the illumination of light with various wavelengths, and the measured data shows that the normalized noise spectral density (Sid/ID2) significantly decreases after the illumination of blue light. This phenomenon...
The Helium Refrigerator System (HRS) of the Korea Superconducting Tokamak Advanced Research (KSTAR) which was designed to provide an energetic equivalent cooling power of 9 kW at 4.5 K, has been operated successfully during last three years since 2008. For the operation of the KSTAR, the all of the cold components, such as the superconducting (SC) magnets, magnet structure, thermal shields (TS), SC...
This paper proposes an explicit parametric model for colonic polyps. The model captures the overall shape of the polyp and is then used to derive the probability distribution of features relevant for polyp detection. The probability distribution represents the glocal properties of the polyp candidates, where the glocal properties capture both global and local information of an object. The probability...
We demonstrate that platinum nanorods across the gap of a nanoresonator shift or overdamp the resonance depending on the rod-size. Moreover, what is striking is that the thinner nanorods almost completely turn off both the fundamental and higher mode resonances, analogous to the pinch harmonics.
We observe that rectangular holes fabricated in a gold film with a sub-skindepth thickness show blue-shifted resonance frequencies as the width increases. For rectangular holes on a finite substrate its thickness and the hole width are crucial factors determining the resonance frequency.
We present resonant transmission through rectangular hole array on a metallic film. Transmission spectra broaden with the resonance peaks shifting toward higher frequencies, as the period decreases. The broadening is caused by inter-resonator coupling effects similar to the tight binding model.
This paper presents an efficient and innovative method for the automated counting of cells in a microscopic image. The performance of watershed-based algorithms for the segmentation of clustered cells has been well demonstrated. The strength of our algorithm lies in the fact that it incorporates knowledge of color in the image. Our method uses the watershed transform with iterative shape alignment...
Cervical cancer is the second most common cancer among women. Meanwhile, cervical cancer could be largely preventable and curable with regular Pap tests. Nuclei changes in the cervix could be found by this test. Accurate nuclei detection is extremely critical as it is the previous step of analysing nuclei changes and diagnosis afterwards. Recently, computer-aided nuclei segmentation has increased...
We propose and verify a model for hot carrier degradation based on the exhaustive evaluation of the energy distribution function for charge carriers in the channel by means of a full-band Monte-Carlo device simulator. This approach allows us to capture the interplay between “hot” and “colder” electrons and their contribution to the damage build-up. In fact, particles characterized by higher energy...
Using a physics-based model for hot-carrier degradation we analyze the worst-case conditions for long-channel transistors of two types: a relatively low voltage n-MOSFET and a high-voltage p-LDMOS. The key issue in the hot-carrier degradation model is the information about the carrier energetical distribution function which allows us to assess the carrier acceleration integral determining the interface...
We have investigated the thickness effect of SiOx layer in the CIGS thin-film solar cells fabricated on stainless-steel substrate. After a SiOx layer with a thickness of 1 or 2-μm was deposited on the substrate by using plasma-enhanced chemical vapor deposition, Na-doped Mo layer and Mo layer were coated on it. A CIGS thin-film solar cell on the stainless-steel substrate without the SiOx layer showed...
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