Chungil Lee

Analysis of Waves Associated With Screech Resonance Mechanism Using Double-Pulsed 3D-BOS Measurement

Chungil Lee, Yuta Ozawa, Takayuki Nagata, Taku Nonomura

Waves associated with screech resonance mechanism of underexpanded jets are investigated using the double-pulsed three-dimensional background-oriented schlieren (3D-BOS) measurement. The nozzle pressure ratio of 2.52 is employed. The microphone measurement is also performed, and two peaks corresponding to screech frequencies of the …

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Superresolution and analysis of three-dimensional velocity fields of underexpanded jets in different screech modes

Chungil Lee, Yuta Ozawa, Takayuki Nagata, Tim Colonius et autres

Time-resolved (TR), three-dimensional (3D) velocity fields of screeching, underexpanded jets are estimated using non-time-resolved particle image velocimetry and simultaneous TR microphone measurements. Specifically, we aim to reconstruct TR 3D velocity fluctuation fields associated with the A2, B, and C modes of a …

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Superresolution Measurement and Comprehension of Time-Resolved Three-Dimensional Density Field of an Underexpanded Jets in Screech B Mode

Chungil Lee, Yuta Ozawa, Takayuki Nagata, Taku Nonomura

View Video Presentation: https://doi.org/10.2514/6.2023-2440.vid A estimation of the time-resolved three-dimensional density fields associated with a screech B mode is performed using non-time-resolved background oriented schlieren (BOS) measurement and time-resolved acoustic data. The density field of a cross-section of the jets is obtained …

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Krill Oil Inhibits Cholesterol Synthesis and Stimulated Cholesterol Excretion in Hypercholesterolemic Rats

Ok‐Kyung Kim, Jeong Moon Yun, Dakyung Kim, Soo‐Jeung Park et autres

The present study aimed to investigate the antihypercholesterolemic effects of krill oil supplementation in high-cholesterol diet-induced hypercholesterolemic rats, and the mechanisms underlying these effects. Rats were divided into five groups: normal control, control (high-cholesterol diet), krill oil 100 mg/kg b.w. (high-cholesterol diet …

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Applying single-pixel ensemble correlation to process of calculating displacements in background oriented schlieren

Hikaru Sugisaki, Chungil Lee, Yuta Ozawa, Kumi Nakai et autres

View Video Presentation: https://doi.org/10.2514/6.2022-4132.vid Background-oriented schlieren (BOS) system proposed in this paper realizes high-spatial resolution by applying the single-pixel correlation method for the image pairs obtained in the process of BOS. The backgrounds are projected by a high-speed projector and changed at …

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Correction: Estimation of Time-Resolved Three-Dimensional Velocity Fields of Underexpanded Jets in Flapping Screech Mode

Chungil Lee, Hiroki Nishikori, Takayuki Nagata, Yuta Ozawa et autres

A method for estimating time-resolved three-dimensional velocity fields from non-time-resolved particle image velocimetry (PIV) and time-resolved near-field acoustic data is proposed and evaluated on a screeching, underexpanded jet.Multi-time-delay modified linear stochastic estimation (MTD-mLSE) is applied to the reduced-order PIV data and the …

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Estimation of Time-Resolved Three-Dimensional Velocity Fields of Underexpanded Jets in Flapping Screech Mode

Chungil Lee, Hiroki Nishikori, Takayuki Nagata, Yuta Ozawa et autres

A method for estimating time-resolved three-dimensional velocity fields from non-time-resolved particle image velocimetry (PIV) and time-resolved near-field acoustic data is proposed and evaluated on a screeching, underexpanded jet. Multi-time-delay modified linear stochastic estimation (MTD-mLSE) is applied to the reduced-order PIV data and …

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In vitro and in vivo anti-tumor efficacy of krill oil against bladder cancer: Involvement of tumor-associated angiogenic vasculature

Hoon Kim, Youngjin Roh, Sang Yong Park, Chungil Lee et autres

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Single-pixel correlation applied to background-oriented schlieren measurement

Hikaru Sugisaki, Chungil Lee, Yuta Ozawa, Kumi Nakai et autres

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Comparison of three-dimensional density distribution of numerical and experimental analysis for twin jets

Chungil Lee, Yuta Ozawa, T. Haga, Taku Nonomura et autres

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Three-Dimensional Density Reconstruction of Supersonic Twin Jets by Background Oriented Schlieren Technique.

Chungil Lee, Yuta Ozawa, Yuji Saito, Taku Nonomura et autres

Evaluating the applicability of a phase-averaged processing of skin-friction field measurement using an optical flow method

Chungil Lee, Taekjin Lee, Taku Nonomura, Keisuke Asai

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