International Journals

2025

1. 

   Monitoring of wild and rehabilitating dolphin interactions during rehabilitation period using surveillance technologies

   Changsoo Kim , Byung-Yeob Kim, and Dong-Guk Paeng^†

   Scientific Reports, Jul 2025

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   Amidst growing animal rights movements, the release of captive cetaceans, particularly killer whales and dolphins, into their natural environments has gained increasing support from activists due to ethical concerns. However, there is a notable lack of quantitative studies on the interactions between wild and captive dolphins during rehabilitation before release. This study assesses the rehabilitation process of captive dolphin during its stay in the sea pen using advanced surveillance techniques. Methods including CCTV, hydrophone monitoring, and drone observations were utilized to document interactions between rehabilitating and wild dolphins. A convolutional neural network-based detector for dolphin whistle sound was used to automatically detect the whistle from underwater sound recorded at the rehabilitation site, which significantly expedited the identification of wild dolphin encounters compared to traditional manual methods. This technology also facilitated synchronized analysis of underwater sounds, CCTV footage, and drone videos, providing comprehensive visual and acoustic observations of captive and wild dolphins during encounters. This research offers insights that can guide future dolphin rehabilitation monitoring and release strategies.

2. 

   Principles of Doppler ultrasound and emerging blood flow imaging

   Dong-Guk Paeng , Cheong-Ah Lee , and Cynthia Imtiaz

   Ultrasonography, Nov 2025

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   Doppler ultrasound is one of the oldest modalities for measuring and visualizing blood flow. This review paper explores the principles of Doppler ultrasound and blood flow imaging. Following a brief history of Doppler ultrasound, all Doppler modes, including B-Flow imaging, are discussed, with emphasis on spectral broadening and Doppler spectrum amplitude in relation to clinical implications. The paper also outlines sources of uncertainty in Doppler flow measurement. Emerging technologies in blood flow imaging are introduced, including microvascular flow imaging without contrast agents and four-dimensional vascular imaging from a two-dimensional transducer, which have been commercialized within the past decade, as well as row-column array transducer systems, high-frame-rate imaging, and photoacoustic imaging, which remain in preclinical and research stages.

3. Comput. Biol. Med.

   

   Spatiotemporal blood viscosity by local hematocrit under pulsatile flow: Whole blood experiments and computational analysis

   Cheong-Ah Lee and Dong-Guk Paeng^†

   Computers in Biology and Medicine, Nov 2025

   Abs DOI

   Blood viscosity is inversely proportionate with shear rate mainly due to red blood cell (RBC) aggregation under steady flow. However, this inverse relation cannot explain the spatiotemporal variation of RBC dynamics under pulsatile flow. This study aimed to clarify the relationship between hemodynamics and hemorheology based on a novel computational model that couples RBC dynamics with blood viscosity under pulsatile flow. By integrating both whole-blood experiments with ultrasound imaging and numerical simulations, the spatiotemporal variations of local hematocrit were shown to drive local variations of blood viscosity under pulsatile flow. The results suggest that the local parabolic distribution of high hematocrit is influenced by RBC aggregation and pulsatile flow characteristics, which in turn affect blood viscosity. Computational analysis supports that local blood viscosity increased in regions with elevated hematocrit during the acceleration phase of pulsatile flow. Local hematocrit and RBC dynamics play critical roles in influencing blood viscosity under pulsatile flow, highlighting the importance of incorporating hemorheological and hemodynamic factors. These are crucial for understanding large arterial flow and potentially enhancing diagnostic and therapeutic approaches for cardiovascular diseases.

4. 

   Sound Absorption of the Water Column and Its Calibration for Multibeam Echosounder Backscattered Mapping in the East Sea of Korea

   Seung-Uk Im, Cheong-Ah Lee , Moonsoo Lim, and 2 more authors

   Applied Sciences, Jan 2025

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   Multibeam echosounder (MBES) backscatter data are influenced by underwater sound absorption, which is dependent on environmental parameters such as temperature, salinity, and depth. This study leverages CTD datasets from the Korea Oceanographic Data Center (KODC) to analyze and visualize the spatiotemporal variations in absorption parameters in the East Sea of Korea, which are subject to pronounced variability over time and space. The legacy MBES backscatter data, originally processed using generalized absorption parameters that neglected spatiotemporal variations, were compared with the calibrated data. The calibration process included inverse calculation of water temperature with depth-specific average salinity values from the nearest KODC stations. This calibration revealed discrepancies of up to 2.1 dB in backscatter intensity across survey lines, highlighting the potential misrepresentation of legacy MBES backscatter data due to site-specific absorption variability having been overlooked. By addressing these discrepancies, this study underscores the importance of incorporating spatiotemporal absorption variability into MBES calibration workflows. This integrated approach not only enhances the reliability of legacy MBES data but also provides valuable insights for marine resource management, seafloor mapping, and environmental monitoring in highly dynamic marine environments such as the East Sea of Korea.

2024

1. Bottlenose dolphin identification using synthetic image-based transfer learning

   Changsoo Kim , Byung-Yeob Kim, and Dong-Guk Paeng

   Ecological Informatics, 2024

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2. Effects of Mucuna pruriens (L.) DC. and Levodopa in Improving Parkinson’s Disease in Rotenone Intoxicated Mice

   Syed Babar Zaigham, Cheong-Ah Lee , and Dong-Guk Paeng

   Current Issues in Molecular Biology, 2024

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2023

1. Improving sonication efficiency in transcranial MR-guided focused ultrasound treatment: A patient-data simulation study

   Changsoo Kim , Matthew Eames, and Dong-Guk Paeng

   Bioengineering, 2023

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2. Acute neuro-biochemical changes induced by nitrogen-tungsten co-doped titanium dioxide nanoparticles

   Hafiz Muhammad Umer Farooqi, Jiyeon Lee, Cheong-Ah Lee , and 5 more authors

   Applied Biological Chemistry, 2023

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3. Axial shear rate: A hemorheological factor for erythrocyte aggregation under Womersley flow in an elastic vessel based on numerical simulation

   C.-A. Lee, H.M.U. Farooqi, and D.-G. Paeng

   Computers in Biology and Medicine, 2023

   

2022

1. Semantic segmentation-based whistle extraction of Indo-Pacific Bottlenose Dolphin residing at the coast of Jeju island

   C. Jin, M. Kim, S. Jang, and 1 more author

   Ecological Indicators, 2022

   
2. The survival of a flukeless juvenile dolphin (Tursiops aduncus) in the wild

   Changsoo Kim , Byung-Yeob Kim, and Dong-Guk Paeng

   Aquatic Mammals, 2022

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3. Circadian and Tidal Changes in Snapping Shrimp (Alpheus brevicristatus) Sound Observed by a Moored Hydrophone in the Coastal Sea of Western Jeju

   I. Jeong and D.-G.Paeng

   Applied Sciences, 2022

   
4. Shock wave characterization using different diameters of an optoacoustic carbon nanotube composite transducer

   J. Lee, S.B. Zaigham, and D.-G. Paeng

   Applied Sciences, 2022

   
5. Electroencephalographic response of brain stimulation by shock waves from laser generated carbon nanotube transducer

   J. Lee, J. LaRocco, and D-G Paeng

   IEEE Transactions on Neural Systems and Rehabilitation Engineering, 2022

   
6. Choroidal thickness in different patterns of diabetic macular edema

   R. Amjad, C.-A. Lee, H.M.U. Farooqi, and 2 more authors

   Journal of Clinical Medicine, 2022

   
7. Production enhancement of human adipose-derived mesenchymal stem cells by low-intensity ultrasound stimulation

   S. Min, Y. Byeon, M. Kim, and 5 more authors

   Scientific Reports, 2022

   

2021

1. Numerical simulation of spatiotemporal red blood cell aggregation under sinusoidal pulsatile flow

   C.-A. Lee and D.-G. Paeng

   Scientific Reports, 2021

   
2. The reasons why fractional flow reserve and instantaneous wave-free ratio are similar using wave separation analysis

   S. Min, G. Kang, D.-G. Paeng, and 1 more author

   BMC Cardiovascular Disorders, 2021

   
3. In Situ Measurement of Sound Attenuation by Fish Schools (Japanese Horse Mackerel, Trachurus japonicus) at Mid-Frequency Bands

   H. Kim and D.-G. Paeng

   Applied Sciences, 2021

   

2020

1. A systemic review of available low-cost EEG headsets used for drowsiness detection

   J. LaRocco, M.D. Le, and D.-G. Paeng

   Frontiers in Neuroinformatics, 2020

   
2. Optimizing computer-brain Interface parameters for non-invasive brain-to-brain Interface

   John LaRocco and Dong-Guk Paeng

   Frontiers in Neuroinformatics, 2020

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3. Attenuation of the human skull at broadband frequencies by using a carbon nanotube composite photoacoustic transducer

   J. Lee, D.-G. Paeng, and K. Ha

   The Journal of the Acoustical Society of America, 2020

   
4. An open-source phase correction toolkit for transcranial focused ultrasound

   C. Jin, D. Moore, J Snell, and 1 more author

   BMC Biomedical Engineering, 2020

   
5. A functional analysis of two 3D-scanned antique pistols from New Zealand

   John LaRocco and Dong-Guk Paeng

   Virtual Archaeology Review, 2020

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2018

1. Depletion-model-based numerical simulation of the kinetics of red blood cell aggregation under sinusoidal pulsatile flow

   Cheong-Ah Lee , Kweon-Ho Nam, and Dong-Guk Paeng

   Biorheology, 2018

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2017

1. Mobility of Amphidinium carterae Hulburt measured by high-frequency ultrasound

   H. Kim, T.-H. Bok, D.-G. Paeng, and 4 more authors

   The Journal of the Acoustical Society of America, 2017

   
2. International Society for Therapeutic Ultrasound Conference 2016: Tel Aviv, Israel. 14-18 March, 2016

   Dong-Guk Paeng and others

   Journal of Therapeutic Ultrasound, 2017

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2016

1. Asymmetric pulsation of rat carotid artery bifurcation in three-dimension observed by ultrasound imaging

   C. Jin, K.-H. Nam, and D.-G. Paeng

   The International Journal of Cardiovascular Imaging, 2016

   
2. 5th International Symposium on Focused Ultrasound: North Bethesda, MD, USA. 28 August-1 September 2016

   Dong-Guk Paeng and others

   Journal of Therapeutic Ultrasound, 2016

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2015

1. Spontaneous echo-contrast in the internal jugular veins of patients with ischemic stroke

   Kweon-Ho Nam and Dong-Guk Paeng

   Journal of Clinical Ultrasound, 2015

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2. Low-salinity-induced surface sound channel in the western sea of Jeju Island during summer

   J. Kim, H. Kim, T.-H. Bok, and 2 more authors

   The Journal of the Acoustical Society of America, 2015

   
3. Feasibility study of high-frequency ultrasonic blood imaging in human radial artery

   T.-H. Bok, Y. Lee, K.-H. Nam, and 2 more authors

   Journal of Medical and Biological Engineering, 2015

   
4. Feasibility Study of Ex Ovo Chick Chorioallantoic Artery Model for Investigating Pulsatile Variation of Arterial Geometry

   K.-H. Nam, J. Kim, G. Ra, and 2 more authors

   PLOS ONE, 2015

   

2014

1. Asymmetric radial expansion and contraction of rat carotid artery observed using a high-resolution ultrasound imaging system

   K.-H. Nam, T.-H. Bok, C. Jin, and 1 more author

   Ultrasonics, 2014

   
2. 3D reconstruction of a carotid bifurcation from 2D transversal ultrasound images

   E. Yeom, K.-H. Nam, C. Jin, and 2 more authors

   Ultrasonics, 2014

   
3. Improvement of ultrasound speckle image velocimetry using image enhancement techniques

   E. Yeom, K.-H. Nam, D.-G. Paeng, and 1 more author

   Ultrasonics, 2014

   
4. Effects of red blood cell aggregates dissociation on the estimation of ultrasound speckle image velocimetry

   E. Yeom, K.-H. Nam, D.-G. Paeng, and 1 more author

   Ultrasonics, 2014

   
5. Implementation of a Rotational Ultrasound Biomicroscopy System Equipped with a High-Frequency Angled Needle Transducer

   Won Hee Pyung, Kweon-Ho Nam, and Dong-Guk Paeng

   Sensors, 2014

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2013

1. High spatial and temporal resolution observations of pulsatile changes in blood echogenicity in the common carotid artery of rats

   K.-H. Nam, T.-H. Bok, Q. Kong, and 1 more author

   Ultrasound in Medicine and Biology, 2013

   
2. A tissue mimicking polyacrylamide hydrogel phantom for visualizing thermal lesions generated by high intensity focused ultrasound

   M.J. Choi, S.R. Guntur, K.I. Lee, and 2 more authors

   Ultrasound in Medicine and Biology, 2013

   
3. Temperature-dependent thermal properties of ex vivo liver undergoing thermal ablation

   S.R. Guntur, K.I. Lee, D.-G. Paeng, and 2 more authors

   Ultrasound in Medicine and Biology, 2013

   
4. In vivo sonothrombolysis of ear marginal vein of rabbits monitored with high-frequency ultrasound needle transducer

   Kweon-Ho Nam, Dong-Guk Paeng , and Min Joo Choi

   Journal of Medical and Biological Engineering, 2013

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5. Diel variation in high-frequency acoustic backscatter from Cochlodinium polykrikoides

   T.-H. Bok, J. Na, and D.-G. Paeng

   The Journal of the Acoustical Society of America, 2013

   

2012

1. An optically transparent tissue mimicking phantom for monitoring the thermal lesion produced by high intensity focused ultrasound

   Dong-Guk Paeng and Min Joo Choi

   The Journal of the Acoustical Society of America, 2012

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2011

1. Changes in ultrasonic properties of liver tissue in vitro during heating-cooling cycle concomitant with thermal coagulation

   M.J. Choi, S.R. Guntur, J.M Lee, and 3 more authors

   Ultrasound in Medicine and Biology, 2011

   
2. The acute effects of smoking on the cyclic variations in blood echogenicity of carotid artery

   Y. Li, T.-H. Bok, J.-H. Yang, and 2 more authors

   Ultrasound in Medicine and Biology, 2011

   
3. Influence of cell packing by centrifugation on 40-MHz ultrasound backscatter

   K.H. Nam, M.J. Choi, E.S. Yoo, and 1 more author

   Ultrasonics, 2011

   
4. Thickness effects of the metallic and the insulating membranes of a cylindrical electromagnetic shock wave transducer

   M.J. Choi, S.C. Cho, D.-G. Paeng, and 2 more authors

   Journal of the Korean Physical Society, 2011

   

2010

1. Cyclic and radial variation of the echogenicity of blood in human carotid arteries observed by harmonic imaging

   D.-G. Paeng, K.H. Nam, and K.K. Shung

   Ultrasound in Medicine and Biology, 2010

   
2. Ultrasonic Doppler measurements of blood flow velocity of rabbit retinal vessels using a 45-MHz needle transducer

   N Matsuoka, D-G Paeng, R Chen, and 2 more authors

   Graefe’s Archive for Clinical and Experimental Ophthalmology, 2010

   
3. Ultrasound backscattered power from Cochlodinium polykrikoides, the main red tide species in the Southern Sea of Korea

   T-H Bok, D-G Paeng, E-H Kim, and 2 more authors

   Journal of Plankton Research, 2010

   

2009

1. Ultrasonic visualization of dynamic behavior of red blood cells in flowing blood

   D.-G. Paeng and Kweon-Ho Nam

   Journal of Visualization, 2009

   
2. Reusable ultrasonic tissue mimicking hydrogels containing nonionic surface-active agents for visualizing thermal lesions

   SK Park, SRAR Guntur, KI Lee, and 2 more authors

   IEEE Transactions on Biomedical Engineering, 2009

   
3. Three-dimensional reconstruction of the "bright ring" echogenicity from porcine blood upstream in a stenosed tube

   Dong-Guk Paeng , Kweon-Ho Nam, Min Joo Choi, and 1 more author

   IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2009

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4. Ultrasonic backscatter from rat blood in aggregating media under in vitro rotational flow

   K.H. Nam, D.-G. Paeng, and M.J. Choi

   IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2009

   
5. Feasibility of rotational scan ultrasound imaging by an angled high frequency transducer for the posterior segment of the eye

   D.-G. Paeng JH Chang, R Chen, M Humayun, and 1 more author

   IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2009

   

2008

1. Quantification of acoustic cavitation produced by a clinical extracorporeal shock wave therapy system using a passive cylindrical detector

   Min Joo Choi and Dong-Guk Paeng

   Modern Physics Letters B, 2008

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2. Ultrasonic observation of blood disturbance in a stenosed tube: Effects of flow acceleration and turbulence downstream

   K.H. Nam, D.-G. Paeng, M.J. Choi, and 1 more author

   Ultrasound in Medicine and Biology, 2008

   

2006

1. Acoustic streaming in lithotripsy fields: preliminary observation using a particle image velocimetry method

   M. J. Choi, D. H. Doh, T. G. Hwang, and 4 more authors

   Ultrasonics, 2006

   

2004

1. Echogenicity variations from porcine blood I: the "bright collapsing ring" under pulsatile flow

   D.-G. Paeng, R. Y. Chiao, and K. K. Shung

   Ultrasound in Medicine and Biology, 2004

   
2. Echogenicity variations from porcine blood II: the "bright ring" under oscillatory flow

   D.-G. Paeng, R. Y. Chiao, and K. K. Shung

   Ultrasound in Medicine and Biology, 2004

   

2003

1. Cyclic and radial variation of the Doppler power from porcine whole blood

   D.-G. Paeng and K. K. Shung

   IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2003

   
2. Ultrasound: An unexplored tool for blood flow visualization and hemodynamic measurements

   K. K. Shung and D.-G. Paeng

   Japanese Journal of Applied Physics, 2003

   

2001

1. Doppler power variation from porcine blood under steady and pulsatile flow

   Dong-Guk Paeng and K. Kirk Shung

   Ultrasound in Medicine and Biology, 2001

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2. The "black hole" phenomenon in ultrasonic backscattering measurement under pulsatile flow with porcine whole blood in a rigid tube

   P.J. Cao, D.-G. Paeng, and K. K. Shung

   Biorheology, 2001