Hyunkook Lee

University of Huddersfield

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Dale Johnson

University of Huddersfield

Maksims Mironovs

Rory Wallis

University of Huddersfield

Christopher Gribben

Wellcome/MRC Cambridge Stem Cell Institute

Sławomir Zieliński

Bialystok University of Technology

Bogdan Bacila

University of Huddersfield

Steven Fenton

University of Huddersfield

Francis Rumsey

University of Surrey

Margaret K. Joyce

Western Michigan University

Paul D. Fleming

Western Michigan University

Cooperative Institutions

University of Huddersfield

Pusan National University

Pusan National University Hospital

Korea University

Sogang University

Pusan National University Yangsan Hospital

Seoul National University

Chinese Academy of Sciences

University of Surrey

Hanbat National University

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Linearity of Hetero-Gate-Dielectric Tunneling Field-Effect Transistors

JSTS Journal of Semiconductor Technology and Science (2013)

Hyunkook Lee Woo Young Choi

Linearity characteristics of hetero-gatedielectric tunneling field-effect transistors (HG TFETs) have been compared with those of high-k-only and SiO₂-only TFETs in terms of IIP3 and P1dB. It has been observed that the optimized HG TFETs have higher IIP3 and P1dB than high-k-only and SiO₂-only TFETs. It is because HG TFETs show higher transconductance (g_m) and current drivability than SiO₂-only TFETs and gm less sensitive to gate voltage than high-k-only TFETs.

Transconductance

Linearity

10.5573/jsts.2013.13.6.551

Cite

Citations (7)

Perceptual Band Allocation (PBA) for the rendering of vertical image spread

Hyunkook Lee

A series of subjective experiments were conducted to investigate a novel vertical image rendering method named ‘Perceptual Band Allocation (PBA)’, using octave bands of pink noise with a vertical 2D reproduction setup with main and height loudspeaker pairs. The perceived height of each octave band was first measured for the main and height loudspeakers individually. Results suggested a significant difference between monophonic and stereophonic images in the perceived relationship between frequency and height. Six different test conditions have been created aiming for various degrees of vertical image spread, in such a way that each frequency band was mapped to either the main or height loudspeaker layer based on the results from the localisation experiment. Multiple comparison tests were conducted to grade the perceived magnitude of vertical image spread. It was generally found that various degrees of vertical image spread could be rendered using different PBA schemes, but the perceived results did not fully match predicted results based on the localisation results. Differences between the main and height loudspeaker layers in the spectral weightings of ear-input signal at certain frequencies was identified as one of the factors that influenced this result.

Stereophonic sound

Octave band

Frequency band

Horizontal and vertical

Source

Cite

Citations (0)

The Effect of Dynamic Range Compression on Loudness and Quality Perception in Relation to Crest Factor

Journal of the Audio Engineering Society (2014)

Mark Wendl Hyunkook Lee

Two listening tests were carried out to find the changes in perceived loudness and perceived quality as the crest factors were changed for three genres (rock, electronic and jazz) as a result of limiting, a type of dynamic range compression. The stimuli ranged from crest factors of 15 dBFS to 9 dBFS with a 1 dBFS increment. Loudness and quality had significant differences between the crest factors suggesting that a change in crest factor affects both. Correlations between loudness and quality were present for rock and jazz however not for electronic suggesting that genres can affect how we perceive quality.

Crest factor

Crest

Source

Cite

Citations (3)

Vertical Amplitude Panning for Various Types of Sound Sources

Maksims Mironovs Hyunkook Lee

It is widely known that the vertical localisation of a real source relies on spectral cues. In order to examine the influence of source spectrum on the accuracy of vertical amplitude panning, the present study conducted subjective localisation tests using six sound sources with different spectral characteristics: broadband, low-passed and high-passed pink noises as well as speech, bird and tank shot recordings. Results generally indicated that the localisation accuracy of vertical amplitude panning was poor regardless of the source type. However, lower or upper response biases observed in the results were found to be significantly dependent on the target panning angle and the type of sound source. The bird and tank shot sources tended to have upper biases regardless of the target angle. The so-called ‘pitch-height’ effect was observed for low-passed and high-passed noise sources, but this was not consistent with the target angle. Overall, the results suggest that the localisation of elevated phantom source is significantly frequency-dependant.

Panning (audio)

Source

Cite

Citations (1)

3D Microphone Array Comparison: Objective Measurements - JAES paper presentation

Zenodo (CERN European Organization for Nuclear Research) (2021)

Hyunkook Lee Dale Johnson

Presentation (obstetrics)

10.5281/zenodo.5675385

Cite

Citations (0)

Perceptually Motivated Amplitude Panning (PMAP) for Accurate Phantom Image Localization

Journal of the Audio Engineering Society (2017)

Hyunkook Lee

This paper proposes and evaluates a new constant-power amplitude-panning law named “Perceptually Motivated Amplitude Panning (PMAP).” The method is based on novel image shift functions that were derived from previous psychoacoustic experiments. The PMAP is also optimized for a loudspeaker setup with an arbitrary base angle using a novel phantom image localization model. Listening tests conducted using various sound sources suggest that, for the 60° base angle, the PMAP provides a significantly better panning accuracy than the tangent law. For the 90° base angle, on the other hand, both panning methods perform equally good. The PMAP is considered to be useful for intelligent sound engineering applications, where an accurate matching between the target and perceived positions is important.

Panning (audio)

Source

Cite

Citations (2)

Increasing the Vertical Image Spread of Natural Sound Sources Using Band-Limited Interchannel Decorrelation

Christopher Gribben Hyunkook Lee

Decorrelation

Source

Cite

Citations (1)

Caregiver or Family Doses due to Discharged $^{131}I$ Administrated Patient from the Hospital

Journal of Radiological Science and Technology (2010)

Gyu-Hwan Jeong Hyunkook Lee Woon-Kap Cho Jai-Ki Lee

Source

Cite

Citations (0)

Just Noticeable Difference in Apparent Source Width Depending on the Direction of a Single Reflection

Journal of the Audio Engineering Society (2017)

Dale Johnson Hyunkook Lee

An investigation on the just noticeable difference in angle of a single reflection in terms of apparent source width was performed using a staircase method to obtain two, single reflection angles between 0° and 180°. In the presence of a direct sound, subjects compared the apparent source width produced by a single 90° reference reflection, and a single test reflection ranging between 0° to 90° and 0° to 180° for each threshold. Subjects repeated this test for four delay times of 5 ms, 10 ms, 20 ms, and 30 ms. Reflection angles were found to be approximately 40° and 130° and, however, do not appear to vary with delay time. This implies that human hearing is not sensitive to changes in reflection angle in terms of apparent source width between the threshold angles.

Reflection

Source

Cite

Citations (0)

Automatic Spatial Audio Scene Classification in Binaural Recordings of Music

Applied Sciences (2019)

Sławomir Zieliński Hyunkook Lee

The aim of the study was to develop a method for automatic classification of the three spatial audio scenes, differing in horizontal distribution of foreground and background audio content around a listener in binaurally rendered recordings of music. For the purpose of the study, audio recordings were synthesized using thirteen sets of binaural-room-impulse-responses (BRIRs), representing room acoustics of both semi-anechoic and reverberant venues. Head movements were not considered in the study. The proposed method was assumption-free with regards to the number and characteristics of the audio sources. A least absolute shrinkage and selection operator was employed as a classifier. According to the results, it is possible to automatically identify the spatial scenes using a combination of binaural and spectro-temporal features. The method exhibits a satisfactory classification accuracy when it is trained and then tested on different stimuli but synthesized using the same BRIRs (accuracy ranging from 74% to 98%), even in highly reverberant conditions. However, the generalizability of the method needs to be further improved. This study demonstrates that in addition to the binaural cues, the Mel-frequency cepstral coefficients constitute an important carrier of spatial information, imperative for the classification of spatial audio scenes.

Ranging

Anechoic chamber

10.3390/app9091724

Cite

Citations (12)