Prof. Jin-Chul Ahn Profile

Prof. Jin-Chul Ahn

at Dankook Univ

SPIE Involvement:

Author

Publications (24)

Proceedings Article | 22 July 2019 Paper

Debonding of ceramic brackets using line laser system

Woo Jong Do, Byeong Kwon Kim, Sung-Min Kwon, Sungjo Park, Jong Hoon Lee, Jin-Chul Ahn, Gu-In Jung

Proceedings Volume 11079, 1107915 (2019) https://doi.org/10.1117/12.2525132

KEYWORDS: Teeth, Ceramics, Laser dentistry, Adhesives, Laser systems engineering, Beam controllers, Laser irradiation, Microscopes, Pulsed fiber lasers, Pulsed laser operation

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Proceedings Article | 19 July 2019 Paper

Optical coherence tomography-based 3D intraoral scanner

Joo Beom Eom, Jonghyun Eom, Anjin Park, Jin-Chul Ahn

Proceedings Volume 11078, 1107823 (2019) https://doi.org/10.1117/12.2524585

KEYWORDS: 3D scanning, Laser scanners, 3D image processing, Optical coherence tomography, Teeth, 3D modeling, Scanners, Clouds, Microelectromechanical systems, 3D acquisition

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Proceedings Article | 14 March 2018 Presentation

Synapto-protective effect of low-level light emitting diode (LED) therapy in an in vitro model of status epilepticus (Conference Presentation)

Namgue Hong, Hee Jung Kim, Jin-Chul Ahn

Proceedings Volume 10477, 1047705 (2018) https://doi.org/10.1117/12.2291433

KEYWORDS: Light emitting diodes, Light-emitting diode therapy, Neurons, In vitro testing, Neurotoxicity, Tissues, Brain, Luminescence

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SPIE Journal Paper | 29 August 2017 Open Access

Treatment of peripheral vestibular dysfunction using photobiomodulation

Min Young Lee, Jai-Hwan Hyun, Myung-Whan Suh, Jin-Chul Ahn, Phil-Sang Chung, Jae Yun Jung, Chung-Ku Rhee

JBO, Vol. 22, Issue 08, 088001, (August 2017) https://doi.org/10.1117/12.10.1117/1.JBO.22.8.088001

KEYWORDS: Ear, Laser therapeutics, Control systems, Eye, Laser irradiation, Animal model studies, Sensors, Medicine, Toxicity, Diamond

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Proceedings Article | 15 February 2017 Paper

In vivo monitoring laser tissue interaction using high resolution Fourier-domain optical coherence tomography

Hang Chan Jo, Dong Jun Shin, Jin-Chul Ahn, Phil-Sang Chung, DaeYu Kim

Proceedings Volume 10062, 1006217 (2017) https://doi.org/10.1117/12.2251558

KEYWORDS: Laser ablation, Laser tissue interaction, Optical coherence tomography, In vivo imaging, Blood, Laser therapeutics, Laser irradiation, Optical resolution, Tissues, Laser optics, Skin, Pulsed laser operation, Semiconductor lasers

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SPIE Journal Paper | 20 May 2016 Open Access

Ex vivo laser lipolysis assisted with radially diffusing optical applicator

Jieun Hwang, Nguyen Trung Hau, Sung Yeon Park, Yun-Hee Rhee, Jin-Chul Ahn, Hyun Wook Kang

JBO, Vol. 21, Issue 05, 058001, (May 2016) https://doi.org/10.1117/12.10.1117/1.JBO.21.5.058001

KEYWORDS: Tissues, Laser tissue interaction, Tissue optics, Diffusers, Fiber lasers, Biomedical optics, Ocean optics, Thermography, Natural surfaces, Microscopes

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Proceedings Article | 27 April 2016 Presentation

Application of novel optical diffuser for urethral stricture treatment (Conference Presentation)

Trung Hau Nguyen, Yun-Hee Rhee, Jin-Chul Ahn, Hyun Wook Kang

Proceedings Volume 9689, 96891H (2016) https://doi.org/10.1117/12.2212217

KEYWORDS: Tissues, Diffusers, Tissue optics, Optical fibers, Laser therapeutics, Laser tissue interaction, Optical fabrication, In vitro testing, Liver, Energy efficiency

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Optical fibers have frequently been used for photothermal laser therapy due to its efficiency to deliver laser energy directly to tissue. The aim of the current study was to develop a diffusing optical fiber to achieve radially uniform light irradiation for endoscopically treating urethral stricture. The optical diffuser was fabricated by micro-machining helical patterns on the fiber surface using CO2 laser light at 5 W. Visible light emission (632 nm) and spatial emissions (including polar, azimuthal, and longitudinal emissions) of the fiber tip were evaluated to validate the performance of the fabricated diffuser. Prior to tissue tests, numerical simulation on heat distribution was developed to estimate the degree of tissue coagulation depth during interstitial coagulation. Due to a high absorption coefficient by tissue water, 1470 nm laser was used for photothermal therapy treatment of urethral stricture to obtain a more precise depth profile. For in vitro tissue tests, porcine liver tissue was irradiated with three different power levels (3, 6, and 9 W) at various irradiation times. Porcine urethral tissue was also tested with the diffuser for 10 sec at 6 W to validate the feasibility of circumferential photothermal treatment. The treated tissue was stained with hematoxylin and eosin (H and E) and then imaged with an optical transmission microscope. The spatial emission characteristics of the diffusing optical fiber presented an almost uniform power distribution along the diffuser tip (less than 10% deviation) and around its circumference (less than 5% deviation). The peak temperature in simulation model at the tissue interface between the glass-cap and the tissue was 373 K that was higher than that at the distal end. The tissue tests showed that higher power levels resulted in lower coagulation thresholds (e.g., 1 sec at 9 W vs 8 sec at 3 W). Furthermore, the coagulation depth was approximately 20% thinner than the simulation results (p<0.001). The extent of coagulation thickness in urethral tissue was measured to be 1.3±0.2 mm, which was slightly thicker (18%) than the liver testing (1.1±0.1 mm) under the same conditions (p < 0.001). The proposed optical diffuser may be a feasible tool to treat the urethral stricture in a uniform manner.

Proceedings Article | 7 March 2016 Paper

Development of 2-micron nonlinear frequency conversion laser system and tissue interaction monitoring using optical coherence tomography

Bongkyun Kim, Jin-Chul Ahn, Phil-Sang Chung, Dae Yu Kim

Proceedings Volume 9706, 97060I (2016) https://doi.org/10.1117/12.2211903

KEYWORDS: Laser ablation, Laser tissue interaction, Optical coherence tomography, Laser systems engineering, Optical parametric oscillators, Tissue optics, Laser irradiation, Nonlinear frequency conversion, Mid-IR, Tissues, Nonlinear crystals

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Proceedings Article | 5 March 2015 Paper

Low level light promotes the proliferation and differentiation of bone marrow derived mesenchymal stem cells

Jin-Chul Ahn, Yun-Hee Rhee, Sun-Hyang Choi, Dae Yu Kim, Phil-Sang Chung

Proceedings Volume 9309, 93090V (2015) https://doi.org/10.1117/12.2078863

KEYWORDS: Acquisition tracking and pointing, Stem cells, Semiconductor lasers, Light emitting diodes, Bone, Laser therapeutics, Manufacturing, Infrared radiation, Calcium, Medicine

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Proceedings Article | 26 February 2015 Paper

The effect of low level laser on anaplastic thyroid cancer

Yun-Hee Rhee, Jeon-Hwan Moon, Jin-Chul Ahn, Phil-Sang Chung

Proceedings Volume 9303, 930323 (2015) https://doi.org/10.1117/12.2078847

KEYWORDS: Cancer, Tissues, Tumors, Laser therapeutics, Neodymium, Semiconductor lasers, In vivo imaging, Laser vision correction, Laser applications, Medicine

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Proceedings Article | 4 March 2014 Paper

Effect of LLLT on the level of ATP and ROS from organ of corti cells

ChungKu Rhee, So-Young Chang, Jin-Chul Ahn, Myung-Whan Suh, Jae Yun Jung

Proceedings Volume 8926, 89261Y (2014) https://doi.org/10.1117/12.2041438

KEYWORDS: Acquisition tracking and pointing, Ear, Proteins, Laser irradiation, Neurons, Carbon dioxide, Acoustics, Laser therapeutics, Confocal microscopy, Microscopes

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Proceedings Article | 20 February 2014 Paper

Microstructured optical fiber-based micro-cavity sensor for chemical detection

Bongkyun Kim, Jin-Chul Ahn, Phil-Sang Chung, Youngjoo Chung

Proceedings Volume 8938, 89380L (2014) https://doi.org/10.1117/12.2041001

KEYWORDS: Micro optical fluidics, Optical fibers, Molecules, Reflectivity, Head, Sensors, Fiber optics sensors, Capillaries, Chemical analysis, Chemical detection

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Proceedings Article | 18 February 2014 Paper

Enhanced angiogenic effect of adipose-derived stromal cell spheroid with low-level light therapy in hindlimb ischemia mice

In-Su Park, Jin-Chul Ahn, Phil-Sang Chung

Proceedings Volume 8932, 893215 (2014) https://doi.org/10.1117/12.2038904

KEYWORDS: Tissues, Ischemia, Transplantation, Animal model studies, Stem cells, Low level phototherapy, Laser therapeutics, Therapeutics, Cell death, Light emitting diodes

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SPIE Journal Paper | 16 December 2013 Open Access

Effect of low-level laser treatment on cochlea hair-cell recovery after ototoxic hearing loss

Chung-Ku Rhee, Peijie He, Jae Yun Jung, Jin-Chul Ahn, Phil-Sang Chung, Min Young Lee, Myung-Whan Suh

JBO, Vol. 18, Issue 12, 128003, (December 2013) https://doi.org/10.1117/12.10.1117/1.JBO.18.12.128003

KEYWORDS: Ear, Laser therapeutics, Scanning electron microscopy, Tissues, Laser irradiation, Fiber lasers, Skin, Head, Animal model studies, Computed tomography

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Proceedings Article | 8 March 2013 Paper

Effect of low level laser therapy (LLLT) on vestibular system after gentamicin ototoxicity

ChungKu Rhee, Jai-Hwan Hyun, Myung-Whan Suh, Jin Chul Ahn, Jae Yun Jung

Proceedings Volume 8565, 85651S (2013) https://doi.org/10.1117/12.2012581

KEYWORDS: Ear, Laser therapeutics, Animal model studies, Vestibular system, Remote sensing, Near infrared, Medicine, Modulation, Neck, Surgery

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SPIE Journal Paper | 5 June 2012 Open Access

Effect of low-level laser treatment on cochlea hair-cell recovery after acute acoustic trauma

Chung-Ku Rhee, Chan Woong Bahk, Se Hyung Kim, Jin-Chul Ahn, Jae-Yun Jung, Phil-Sang Chung, Myung-Whan Suh

JBO, Vol. 17, Issue 06, 068002, (June 2012) https://doi.org/10.1117/12.10.1117/1.JBO.17.6.068002

KEYWORDS: Ear, Acoustics, Laser therapeutics, Scanning electron microscopy, Scanning probe lithography, Laser irradiation, Laser damage threshold, Acquisition tracking and pointing, Proteins, Electron microscopes

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Proceedings Article | 9 February 2012 Paper

The optimal window time to treat noise-induced hearing loss (NIHL) with low level laser therapy (LLLT)

So-Young Chang, Myung-Whan Suh, Chan Woong Bahk, Jae Yun Jung, Jin-Chul Ahn, Phil-Sang Chung, Chung-Ku Rhee

Proceedings Volume 8207, 820727 (2012) https://doi.org/10.1117/12.912431

KEYWORDS: Ear, Scanning probe lithography, Laser therapeutics, Statistical analysis, Oxygen, Modulation, Semiconductor lasers, Fiber lasers, Electrodes, Cell death

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Proceedings Article | 18 February 2011 Paper

Cochlea hair cell rescue after a noise-induced hearing loss using a low level laser therapy (LLLT)

Chung-Ku Rhee, Chan Woong Bahk, Jae Yun Jung, Jin-Chul Ahn, Myung-Whan Suh

Proceedings Volume 7883, 788322 (2011) https://doi.org/10.1117/12.880193

KEYWORDS: Ear, Laser therapeutics, Scanning probe lithography, Medical research, Nerve, Laser irradiation, Neck, Medicine, LASIK, Surgery

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Proceedings Article | 3 March 2010 Paper

The effect of PDT on H. influenzae biofilm in vivo

Chung-Ku Rhee, So-Young Chang, Dong-Jo Hwang, Young Hoon Kim, Jin-Chul Ahn

Proceedings Volume 7548, 754830 (2010) https://doi.org/10.1117/12.848587

KEYWORDS: Photodynamic therapy, Picosecond phenomena, Semiconductor lasers, Bacteria, In vivo imaging, Fiber lasers, Scanning electron microscopy, Ear, Pathogens, Tissues

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Proceedings Article | 26 February 2010 Paper

Effect of low level laser therapy on hair cell regeneration following gentamicin induced ototoxicity in postnatal organotypic culture of rat cochlea

Chung-Ku Rhee, Young Hoon Kim, Se Hyung Kim, Peijie He, Jin Chul Ahn

Proceedings Volume 7552, 75520B (2010) https://doi.org/10.1117/12.841267

KEYWORDS: Laser therapeutics, Ear, Nerve, In vitro testing, Sensors, Tissues, LASIK, Medical research, Fermium, Frequency modulation

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Proceedings Article | 25 February 2009 Paper

Preventive and therapeutic effects of low level laser irradiation on gentamicin vestibulotoxicity in rat utricle

Chung-Ku Rhee, Yang Hee Oh, Jin-Chul Ahn, Min-Sang Jung, Yeong-Sik Kim, Myung-Whan Suh

Proceedings Volume 7165, 71650J (2009) https://doi.org/10.1117/12.807676

KEYWORDS: Scanning electron microscopy, Ear, Laser therapeutics, Tissues, Semiconductor lasers, Laser scanners, Nerve, Confocal microscopy, Electron microscopes, Acquisition tracking and pointing

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Proceedings Article | 23 February 2009 Paper

The effect of PDT on H. influenzae biofilm in vitro

C.-K. Rhee, S. H. Bae, J. W. Lee, J. C. Ahn, J. Y. Jung, M.-W. Suh

Proceedings Volume 7161, 71611V (2009) https://doi.org/10.1117/12.820697

KEYWORDS: Photodynamic therapy, Picosecond phenomena, Semiconductor lasers, In vitro testing, Bacteria, Confocal microscopy, Ear, Luminescence, Pathogens, Biological research

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Proceedings Article | 8 February 2008 Paper

Photodynamic therapy of otitis media in-vitro and in-vivo using gerbil

Chung-Ku Rhee, Pil Seung Kwon, Jin Chul Ahn, Phil Sang Chung, Ruifeng Ge

Proceedings Volume 6842, 68422Y (2008) https://doi.org/10.1117/12.774983

KEYWORDS: Photodynamic therapy, Bacteria, Ear, Picosecond phenomena, In vitro testing, Transmission electron microscopy, In vivo imaging, Semiconductor lasers, Flow cytometry, Pathogens

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Proceedings Article | 13 June 2003 Paper

Anticancer effect and cell cycle regulation of photodynamic therapy (PDT) using 9- hydroxypheophorbide-a and 660-nm diode laser

Phil-Sang Chung, Chung-Ku Rhee, Chung-Hun Oh, Han-Gyun Kim, Sang-Oun Jung, Jin-Chul Ahn

Proceedings Volume 4952, (2003) https://doi.org/10.1117/12.474152

KEYWORDS: Photodynamic therapy, Tumors, Semiconductor lasers, Laser irradiation, In vitro testing, Oxygen, Laser therapeutics, Cell death, Bioalcohols, Proteins

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Showing 5 of 24 publications

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