Search Results - "Jeon, Oc‐Yeub"

A Pre-Training Framework Based on Multi-Order Acoustic Simulation for Replay Voice Spoofing Detection by Go, Changhwan, Park, Nam In, Jeon, Oc-Yeub, Chun, Chanjun

“…Voice spoofing attempts to break into a specific automatic speaker verification (ASV) system by forging the user’s voice and can be used through methods such…”
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Forensic authentication method for audio recordings generated by Voice Recorder application on Samsung Galaxy Watch4 series by Park, Nam In, Lim, Seong Ho, Byun, Jun Seok, Kim, Jin‐Hwan, Lee, Ji Woo, Chun, Chanjun, Kim, Yonggang, Jeon, Oc‐Yeub

“…The number of smartwatch users has been rapidly increasing in recent years. A smartwatch is a wearable device that collects various types of data using sensors…”
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Advanced forensic procedure for the authentication of audio recordings generated by Voice Memos application of iOS14 by Park, Nam In, Shim, Kyu‐Sun, Lee, Ji Woo, Kim, Jin‐Hwan, Lim, Seong Ho, Byun, Jun Seok, Kim, Yong Jin, Jeon, Oc‐Yeub

“…In this study, we propose an advanced forensic examination procedure for audio recordings generated by the Voice Memos application with iPhone Operation System…”
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Vehicle Speed Measurement Methodology Robust to Playback Speed-Manipulated Video File by Shim, Kyu-Sun, Park, Nam In, Kim, Jin-Hwan, Jeon, Oc-Yeub, Lee, Heejo

“…Concomitant with the virtual ubiquity of dashcams in vehicles, the instantaneous speed of vehicles during accidents can now be measured using dashcam videos to…”
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A method of forensic authentication of audio recordings generated using the Voice Memos application in the iPhone by Park, Nam In, Lee, Ji Woo, Shim, Kyu-Sun, Byun, Jun Seok, Jeon, Oc-Yeub

“…•Forensic Authentication of audio recordings generated using the iPhone.•Forensic procedures for detecting the manipulation of audio recordings.•Analyzing the…”
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Analysis of real-time operating systems’ file systems: Built-in cameras from vehicles by Lee, Jung-Hwan, Hyeon, Bum-Su, Jeon, Oc-Yeub, Park, Nam In

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Energy-based linear PCM audio recovery method of impaired MP4 file stored in dashboard camera memory by Park, Nam In, Lee, Ji Woo, Lim, Seong Ho, Byun, Jun Seok, Jeon, Oc-Yeub, Lee, Jung Hwan

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Efficient second-harmonic generation of ultrafast pulses in periodically poled KNbO3 by Yu, Nan Ei, Kurimura, Sunao, Kitamura, Kenji, Jeon, Oc-Yeub, Cha, Myoungsik, Ashihara, Satoshi, Ohta, Takayuki, Shimura, Tsutomu, Kuroda, Kazuo, Hirohashi, Junji

“…Efficient second-harmonic generation of 95 fs pulses were achieved by simultaneous group-velocity matching and quasi-phase matching in a 10 mm long…”
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Invisible ink mark detection in the visible spectrum using absorption difference by Lee, Joong, Kong, Seong G, Kang, Tae-Yi, Kim, Byounghyun, Jeon, Oc-Yeub

“…Abstract One of popular techniques in gambling fraud involves the use of invisible ink marks printed on the back surface of playing cards. Such covert patterns…”
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Broadband optical parametric amplification at the communication band with periodically poled lithium niobate by Jeon, Oc-Yeub, Jin, Min-Ji, Lim, Hwan-Hong, Kim, Byoung-Joo, Cha, Myoungsik

“…We report broadband optical parametric generation (OPG) in a single periodically poled lithium niobate crystal with a picosecond pump pulse at a fixed…”
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Forged seal detection based on the seal overlay metric by Lee, Joong, Kong, Seong G, Lee, Young-Soo, Moon, Ki-Woong, Jeon, Oc-Yeub, Han, Jong Hyun, Lee, Bong-Woo, Seo, Joong-Suk

“…Abstract This paper describes a method for verifying the authenticity of a seal impression imprinted on a document based on the seal overlay metric, which…”
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Polarization-dependent optical gain in crystal and glass composed of excited-state intramolecular proton transfer organic molecules by Lim, Hwan Hong, Boomadevi, Shanmugam, Jeon, Oc-Yeub, Kyhm, Kwangseuk, Cha, Myoungsik, Park, Sanghyuk, Park, Soo Young

“…Amplified spontaneous emission (ASE) associated with excited-state intramolecular proton transfer (ESIPT) was investigated in a single crystal and a glass of…”
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Nondestructive imaging of hidden figures on license plates by X-ray radiograph by Jeon, Oc-Yeub, Kim, Sang-Hyeon, Lee, Joong, Park, Jong-Taek, Kim, Tae-Hoon, Park, Hak-Soo, Huh, Il-Kwon, Kang, Hyung-Tae

“…Abstract In this case, we investigated the modified license plates. The evidences had new embossing pressed serial numbers after erasing the original numbers…”
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Generation of Simultaneous Red, Green and Blue Light in Periodically Poled Lithium Niobate with Broad Quasi-Phase Matching Band by Hwan-Hong Lim, Oc-Yeub Jeon, Byeong-Joo Kim, Pandiyan, K., Myoungsik Cha

“…We demonstrated simultaneous red, green and blue light generation in periodically poled lithium niobate pumped with single picosecond laser. The primary color…”
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Non-Stoichiometric Defect Effect on Coercive Field in Lithium Niobate Crystals by Ro, Jung Hoon, Jeon, Oc-Yeub, Kim, Tae-Hoon, Ro, Ji-Hyun, Cha, Myoungsik

“…The internal field of lithium niobate (LN) crystal defined by the offset of the ferroelectric hysteresis loop exhibits two distinct relaxation time, suggesting…”
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Generation of Simultaneous Red, Green and Blue Light based on Broad Quasi-Phase-Matched Optical Parametric Generation by Hwan Hong Lim, Oc Yeub Jeon, Byeong Joo Kim, Pandiyan, K., Myoungsik Cha

“…We observed simultaneous red, green and blue light generated from periodically poled lithium niobate pumped with single picosecond laser. This process could be…”
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Generation of simultaneous red, green and blue light in periodically poled lithium niobate with broad quasi-phase matching band by Hwan-Hong Lim, Oc-Yeub Jeon, Byeong-Joo Kim, Krishnamoorthy Pandiyan, Myoungsik Cha

“…We demonstrated simultaneous red, green and blue light generation in periodically poled lithium niobate pumped with single picosecond laser. The primary color…”
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Amplified spontaneous emission and two-photon fluorescence in an organic single crystal composed of excited-state intramolecular proton transfer molecules by Jae Hyun Park, Oc-Yeub Jeon, Myoungsik Cha

“…Low-threshold amplified spontaneous emission of blue fluorescence was observed in an organic single crystal composed of excited-state intramolecular proton…”
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Efficient broadband second harmonic generation in periodically-poled potassium niobate by Nan Ei Yu, Kurimura, S., Kitamura, K., Oc-Yeub Jeon, Myoungsik Cha, Ashihara, S., Ohta, T., Shimura, T., Kuroda, K., Hirohashi, J., Jung Hoon Ro

“…Efficient broad-band SHG was demonstrated by simultaneous matching of group-velocity and phase-velocity in a 10.5 mm long periodically-poled potassium niobate…”
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