Uk-Jin Song

A Study on the Stability of Ultra-High Frequency Vocalization of Soprano Singers

Among the myriad of musical activities, singing, that is, playing with the human voice, has a longer history than any other instrument, and it still draws the attention of a large portion of the audience who listens to music today. Singers cover a wide range of fields and areas of expertise, including popular music singers, Korean traditional musicians, and classical vocalists. In general, when we sing, our voice clearly shows vibrations at low and mid-range frequencies, but these vibration characteristics deteriorate in the high-frequency range. There are, however, a few female sopranos who can consistently produce the highest notes even in the high frequency range. In this paper, in order to confirm whether these soprano singers actually show distinct vibrations in the high frequency range, we analyze the vibration characteristics of four Korean sopranos to ascertain the depth of their vocal vibration. The results show that the soprano singer D has the highest vibration depth, followed by soprano A, soprano C, and soprano B.

A study on the oxygen generation in water molecules using sound wave

Life is living in a different place. There are mammals and birds living in the air through oxygen. There is a life extension using oxygen present in the water. There are fish and mammals in the water that use oxygen in the water. The whales, belonging to the mammals in the sea, breathe out of the water at regular intervals and then back into the water. Fish do not hinder the extension of life without these actions. This study uses speakers as means for generating oxygen in water molecules. It is a study to decompose oxygen in water by using the dense wave of the speaker sound wave. It is a study that removes oxygen by affecting the bonding structure of water molecules through the vibration of sound waves. Unlike other chemical methods, this characteristic can generate oxygen without generating hydrogen.

A study on assessing clarity in pronunciation of soprano singers

The voice of soprano singers reaches at the highest notes among female vocalists. Soprano singers usually have low clarity with respect to pronunciation because their jaw joints and mouth shapes tend to stay rigid in order to maintain high notes for a long time. Five formants found in human voice are differently shaped depending on his or her different physical structures. Especially, high clarity in pronunciation has a distinct formant shape from F1 through F5, because the jaw joint and the mouth shape have a large influence on F4 and F5 appearing in the high frequency range. This paper comparatively analyzes the vocal voices of four different Korean soprano singers concerning clarity in pronunciation. The results of acoustic analysis of these four singers shows that the singer A and the singer D show from F1 ~ up to F3 above 2 kHz but F4 and F5 do not appear in this range, and the singer C had somewhat inconsistency with her formant characteristics as a whole. In the singer B, formants from F1 through F...

A study on 7 color marking of impact noise

Interlayer noise is a noise pollution that occurs mainly in a space where a large number of households, such as multi-family houses or apartments, are together. There are various types of interlayer noise depending on what kind of sound is generated, but there are impact sounds as a great stimulus to human auditory sense. However, to date, the issue of interlayer noise has been the subject of concern because the interlayer noise criterion limits the average size of a certain section and there is no standard for impact noise that appears temporarily. Therefore, in this paper, A7B shows the number of impulse sounds in a row in order to make objective visual data about the interlaminar impact noise. In this case, the criterion of the impact sound is defined as a portion where a large change in sound volume occurs within 0.1 second. Experimental results show that the results similar to the number of impact sounds of the corresponding interlaminar impact noise source can be visually confirmed, and furthermore,...

A Study on Duct Sound Source in Subway Using Sound A Color

In order to ensure the safety of citizens, subway stations that install screen doors between railroad tracks and people waiting in the subway stations are increasing. This paper considers the acoustic characteristics of the train that runs the section where the screen door is installed. The noise in the subway with screen door shows one dimensional acoustic characteristics and compared with the sound transmission characteristic Received (July 14, 2017), Review Result (July 28, 2017) Accepted (August 4, 2017), Published (October 31, 2017) 1 156-743 Dept. Information & Telecommunication Engr. SoongSil Univ., Sangdo-dong, Dongjak-gu, Seoul, Korea email: go6051@naver.com 156-743 Dept. Information & Telecommunication Engr. SoongSil Univ., Sangdo-dong, Dongjak-gu, Seoul, Korea email: imduj@ssu.ac.kr 3 (Corresponding Author) 156-743 Dept. Information & Telecommunication Engr. SoongSil Univ., Sangdo-dong, Dongjak-gu, Seoul, Korea email: mjbae@ssu.ac.kr A Study on Duct Sound Source in Subway Using Sound A Color Copyright c 2017 HSST 888 of free space due to the duct type transmission characteristic. The screen door was installed as a countermeasure against safety problems in the subway tunnel. Screen doors form ducts as they pass through subway tunnels, amplifying the sound pressure of the subway interior noise on board the passengers. Sound A color was applied to the sound pressure in the subway. By introducing the wave number per frequency band, the wave number in the vicinity of the red light was assigned to a lower frequency in the range of the visible light, and the number of wave numbers in the vicinity of the purple color was assigned. Log scale was applied. The basic resonance frequency in the subway is 150Hz, which is the default value when the train does not enter the subway. This value remained constant even with various changes of state, and was highest when the train was running at the highest speed in the tunnel, much higher than the energy ratio in the other frequency range. Because this resonant frequency is modulated duct-like in the train, it becomes a form recognizable to human hearing. This has been found to cause adverse effects on crew and passengers who travel for a long time.