document

Usage of fiber Bragg grating sensors in low earth orbit environment

Park, S.O. (author), Moon, J.B. (author), Lee, Y.G. (author), Kim, C.G. (author), Bhowmik, S. (author)

It is widely known that materials exposed to the severe low earth orbit (LEO) environment undergo degradations. For the evaluation of fiber Bragg grating (FBG) sensors in the LEO environment, the reflective spectrum change and the Bragg wavelength shift of FBG sensor were measured during aging cycles simulating the LEO environment. The LEO...

conference paper 2008

document

Near-field studies of surface plasmon generation: Optical and terahertz studies

Kihm, H.W. (author), Lee, K.G. (author), Seo, M.A. (author), Ahn, K.J. (author), Adam, A.J.L. (author), Kang, J.H. (author), Park, Q.H. (author), Planken, P.C.M. (author), Kim, D.S. (author)

We study the dielectric constant dependent diffraction phenomena of single slit apertures, both theoretically and experimentally. We experimentally simulate perfect metal and real metal cases by investigating subwavelength diffraction by a single slit, both in nano-optical and in terahertz regimes, keeping the slit-width/wavelength ratio...

conference paper 2008

document

A 200Gb/s PAM-4 Transmitter with Hybrid Sub-Sampling PLL in 28nm CMOS Technology

Wang, Zhongkai (author), Choi, Minsoo (author), Kwon, Paul (author), Lee, Kyoungtae (author), Yin, Bozhi (author), Liu, Zhaokai (author), Park, Kwanseo (author), Biswas, Ayan (author), Du, S. (author)

This paper presents a complete 200Gb/s PAM-4 transmitter (TX) in 28nm CMOS technology. The transmitter features a hybrid sub-sampling PLL (SSPLL) with a delta-sigma (?S) modulator, clock distribution network with flexible timing control, and data path with a hybrid 5-tap Feed-Forward Equalizer (FFE) and T-coil for bandwidth extension. The...

conference paper 2022

document

SALoBa: Maximizing Data Locality and Workload Balance for Fast Sequence Alignment on GPUs

Park, Seongyeon (author), Kim, Hajin (author), Ahmad, T. (author), Ahmed, N. (author), Al-Ars, Z. (author), Hofstee, H.P. (author), Kim, Youngsok (author), Lee, Jinho (author)

Sequence alignment forms an important backbone in many sequencing applications. A commonly used strategy for sequence alignment is an approximate string matching with a two-dimensional dynamic programming approach. Although some prior work has been conducted on GPU acceleration of a sequence alignment, we identify several shortcomings that limit...

conference paper 2022

document

Origin of an enhanced colossal magnetoresistance effect in epitaxial Nd0.52Sr0.48MnO3 thin films

Prokhorov, V.G. (author), Kaminsky, G.G. (author), Kim, J.M. (author), Eom, T.W. (author), Park, J.S. (author), Lee, Y.P. (author), Svetchnikov, V.L. (author), Levtchenko, G.G. (author), Nikolaenko, Y.M. (author), Khokhlov, V.A. (author)

Nd0.52Sr0.48MnO3 films of various thicknesses have been prepared by dc magnetron sputtering on single crystal LaAlO3 (001) substrates. Reducing the film thickness leads to a significant suppression of ferromagnetic (FM) ordering and the Curie point falls below the antiferromagnetic (AFM) transition temperature. When this occurs, a huge rise of...

journal article 2011

document

Reduction of propeller cavitation induced hull exciting pressure by a reflected wave from air-bubble layer

Lee, Jeung-Hoon (author), Park, Hyoung-Gil (author), Kim, Jin-Hak (author), Lee, Kyung-Jun (author), Seo, Jong-Soo (author)

journal article 2014

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Magnetic phase diagram and structural separation of La0.7(Ca1?ySry)0.3MnO3 thin films

Lee, Y.P. (author), Park, S.Y. (author), Park, J.S. (author), Prokhorov, V.G. (author), Komashko, V.A. (author), Svetschnikov, V.L. (author), Kang, J.H. (author)

The structural, magnetic, and transport properties of La0.7(Ca1?ySry)0.3MnO3 films, deposited on a LaAlO3?(001) single crystalline substrate by rf-magnetron sputtering using “soft” (or powder) targets, have been investigated. It was found that at 0.3 ? y ? 0.5 both the rhombohedral (R3c) and the orthorhombic (Pnma) crystal phases in the form of...

journal article 2007

document

Microstructures and the corresponding magnetic properties of half-doped Nd0.5Sr0.5MnO3 films

Prokhorov, V.G. (author), Hyun, Y.H. (author), Park, J.S. (author), Kim, J.B. (author), Kim, G.H. (author), Lee, Y.S. (author), Lee, Y.P. (author), Svetchnikov, V.L. (author)

The microstructural and magnetic properties of amorphous, nanoclustered, and self-organized bilayer Nd0.5Sr0.5MnO3 films, prepared by rf magnetron sputtering, are investigated. The amorphous film was found to be a typical paramagnet with free motion of the individual Mn spins, and the magnetic properties are well described on the basis of the...

journal article 2008

document

Microstructural and magnetotransport properties of La0.7Ca0.3MnO3/BaTiO3 and La0.7Sr0.3MnO3/BaTiO3 bilayered films

Lee, Y.P. (author), Park, S.Y. (author), Hyun, Y.H. (author), Kim, J.B. (author), Prokhorov, V.G. (author), Komashko, V.A. (author), Svetchnikov, V.L. (author)

journal article 2006

document

Evidence of non-Dzyaloshinskii–Moriya ferromagnetism in epitaxial BiFeO3 films

Prokhorov, V.G. (author), Kaminsky, G.G. (author), Kim, J.M. (author), Eom, T.W. (author), Park, J.S. (author), Lee, Y.P. (author), Svetchnikov, V.L. (author), Levtchenko, G.G. (author), Nikolaenko, Y.M. (author), Khokhlov, V.A. (author)

X-ray diffraction analysis and high-resolution electron microscopy of BiFeO3 films prepared by dc magnetron sputtering on single-crystal LaAlO3 (001) substrates reveal that the films have a highly c-oriented orthorhombic crystalline structure. The magnetic properties of the BiFeO3 films are typical of ensembles of interacting superparamagnetic...

journal article 2011

document

Fourier-transform terahertz near-field imaging of one-dimensional slit arrays: Mapping of electric-field-, magnetic-field-, and Poynting vectors

Seo, M.A. (author), Adam, A.J.L. (author), Kang, J.H. (author), Lee, J.W. (author), Jeoung, S.C. (author), Park, Q.H. (author), Planken, P.C.M. (author), Kim, D.S. (author)

We present 2D measurements of the full THz electric field behind a sample consisting of multiple slits in a metal foil. Our measurements, which have a sub-wavelength spatial, and a sub-period temporal resolution, reveal electric field lines, electric field vortices and saddle points. From our measurements we are able to reconstruct the magnetic...

journal article 2007

document

Study on added resistance of a tanker in head waves at different drafts

Park, Dong-Min. (author), Kim, Yonghwan (author), Seo, Min-Guk (author), Lee, Jaehoon (author)

journal article 2016

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Two-dimensional growth, anisotropic polaron transport, and magnetic phase segregation in epitaxial Nd0.52Sr0.48MnO3 films

Prokhorov, V.G. (author), Kaminsky, G.G. (author), Kim, J.M. (author), Eom, T.W. (author), Park, J.S. (author), Lee, Y.P. (author), Svetchnikov, V.L. (author), Levtchenko, G.G. (author), Paschenko, A.V. (author), Medvedev, Y.V. (author), Nikolaenko, Y.M. (author), Bukin, G.V. (author), Khokhlov, V.A. (author)

Nd0.52Sr0.48MnO3 films have been fabricated by dc magnetron sputtering on single-crystal LaAlO3 (001) and SrTiO3 (011) substrates with additional annealing to relax the lattice strain. Although the Nd0.52Sr0.48MnO3 films were deposited simultaneously on different substrates at the same deposition rate, they differ in thickness by a factor of ? ....

journal article 2011

document

A fully-integrated 12.5-Gb/s 850-nm CMOS optical receiver based on a spatially-modulated avalanche photodetector

Lee, M.J. (author), Youn, J.S. (author), Park, K.Y. (author), Choi, W.Y. (author)

We present a fully integrated 12.5-Gb/s optical receiver fabricated with standard 0.13-µm complementary metal-oxide-semiconductor (CMOS) technology for 850-nm optical interconnect applications. Our integrated optical receiver includes a newly proposed CMOS-compatible spatially-modulated avalanche photodetector, which provides larger...

journal article 2014

document

Shape resonance omni-directional terahertz filters with near-unity transmittance

Lee, J.W. (author), Seo, M.A. (author), Park, D.J. (author), Kim, D.S. (author), Jeoung, S.C. (author), Lienau, C. (author), Park, Q.H. (author), Planken, P.C.M. (author)

Terahertz transmission filters have been manufactured by perforating metal films with various geometric shapes using femtosecond laser machining. Two dimensional arrays of square, circular, rectangular, cshaped, and epsilon-shaped holes all support over 99% transmission at specific frequencies determined by geometric shape, symmetry,...

journal article 2006

document

Near field imaging of terahertz focusing onto rectangular apertures

Seo, M.A. (author), Adam, A.J.L. (author), Kang, J.H. (author), Lee, J.W. (author), Ahn, K.J. (author), Park, Q.H. (author), Planken, P.C.M. (author), Kim, D.S. (author)

We performed terahertz near-field experiments on single rectangular holes with various lengths grown on an electro-optic crystal substrate with ?/100 resolution. We find that the near-field amplitude becomes proportionally larger as the rectangle becomes narrower, strongly suggesting that a constant energy passes through even for a very narrow...

journal article 2008

document

An Output Bandwidth Optimized 200-Gb/s PAM-4 100-Gb/s NRZ Transmitter With 5-Tap FFE in 28-nm CMOS

Wang, Zhongkai (author), Choi, Minsoo (author), Lee, Kyoungtae (author), Park, Kwanseo (author), Liu, Zhaokai (author), Biswas, Ayan (author), Han, Jaeduk (author), Du, S. (author), Alon, Elad (author)

This article presents a 200-Gb/s pulse amplitude-modulation four-level (PAM-4) and 100-Gb/s non-return-to-zero (NRZ) transmitter (TX) in 28-nm CMOS technology. To achieve the target data rate, the output bandwidth and swing of the proposed TX are optimized by minimizing the output capacitance of the 4:1 multiplexer (MUX) and driver stage with...

journal article 2022

document

Review of whole system simulation methodologies for assessing mobility as a service (Maas) as an enabler for sustainable urban mobility

Muller, Mark (author), Park, Seri (author), Lee, Ross (author), Fusco, Brett (author), Correia, Gonçalo (author)

Mobility as a Service (MaaS) is an emerging concept that is being advanced as an effective approach to improve the sustainability of mobility, especially in densely populated urban areas. MaaS can be defined as the integration of various transport modes into a single service, accessible on demand, via a seamless digital planning and payment...

journal article 2021

document

Development of an online men’s suits customizing system using heuristic procedure for wheelchair users

Jeong, Minseok (author), Yang, Chuneun (author), You, Heecheon (author), Park, Kwangae (author), Lee, W. (author)

An online suit-customizing system for the special accessibility needs of wheelchair users should be developed because the demand for business suits by wheelchair users involved in economic activities has increased. This study<br/>develops a user interface an online customizing system for men's suits specialized for wheelchair users. This study...

journal article 2016

document

Biocatalytic C=C Bond Reduction through Carbon Nanodot-Sensitized Regeneration of NADH Analogues

Kim, Jinhyun (author), Lee, S.H. (author), Tieves, F. (author), Choi, Da Som (author), Hollmann, F. (author), Paul, C.E. (author), Park, Chan Beum (author)

Light-driven activation of redox enzymes is an emerging route for sustainable chemical synthesis. Among redox enzymes, the family of Old Yellow Enzyme (OYE) dependent on the nicotinamide adenine dinucleotide cofactor (NADH) catalyzes the stereoselective reduction of α,β-unsaturated hydrocarbons. Here, we report OYE-catalyzed asymmetric...

journal article 2018