• Proceedings of the Korean Nutrition Society Conference
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• 1999.05b
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• pp.97-98
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• 1999

• Journal of the Chungcheong Mathematical Society
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• v.23 no.4
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• pp.741-748
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• 2010

Let R be a 2-torsionfree prime ring. Our goal in this note is to show that the existence of a nonzero Jordan higher left derivation on R implies R is commutative. This result is used to prove a noncommutative extension of the classical Singer-Wermer theorem in the sense of higher derivations.

• Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
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• v.12 no.1
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• pp.39-45
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• 2001

Background and Objectives : A post-pubescent male classical singer has lower vocal register than a female classical singer. Countertenors who can produce higher vocal register like female classical singers with their falsetto voice and head resonance are recently active. The general purpose of this study is to analyze voice of countertenors and to determine the differences with those of classical singers. Materials and Methods : Four countertenors in Korea were examined using a videostrobos-copy and their voice were analyzed using aerodynamic, acoustic and voice range profile methods. Results and Conclusion : Countertenors could produce elevated fundamental frequency, voice intensity and mean air flow rate using large pulmonary capacity and head voiced falsetto. It means the presence of greater energy in countertenor is due to the more efficient conversion of the air flow to acoustic energy. But, they had unstable amplitude perturbation per each vocal cycle. The results indicated that countertenor is the acoustic products of different laryngeal mechanism with other classical register and it can be recognized as one of the registers of male classical singers.

• The Journal of the Korea institute of electronic communication sciences
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• v.10 no.1
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• pp.1-6
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• 2015

Recently, According to increasing interest to original sound Karaoke instrument, MIDI type karaoke manufacturer attempt to make more cheap method instead of original recoding method. The specific method is to make the original sound accompaniment to remove only the voice of the singer in the singer music album. In this paper, a system to separate vocal components from music accompaniment for stereo recordings were proposed. Proposed system consists of two stages. The first stage is a vocal detection. This stage classifies an input into vocal and non vocal portions by using SVM with MFCC. In the second stage, selective frequency subtractions were performed at each frequency bin in vocal portions. Listening test with removed vocal music from proposed system show relatively high satisfactory level.

• Phonetics and Speech Sciences
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• v.1 no.2
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• pp.163-171
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• 2009

This study attempted to investigate vocal characteristics and differences in gender and voice classification among classical singers. Twenty-three female singers (M = 23.1 yrs, SD = 3.6 yrs, average 6.3 yrs singing experience, all classified as sopranos) and twenty male singers (M = 25.2 yrs, SD= 3.6 yrs, average 6. 3 yrs singing experience, 8 tenors, 12 baritones) were recruited to participate in the present study. Speaking fundamental frequency (FO), closed quotient (CQ), MPT (Maximum Phonation Time), breathing types, maximum inspiratory pressure (MIP), maximum expiratory pressure (MEP), and singers' formants were measured. In addition, vibratory patterns were observed using stroboscopy. Sfo, singing CQ, breathing types, formant frequency in singers' formants, MIP, MEP, and MPT were significantly different from gender to gender. Generally, singers' formants were observed in male singers and also the pattern of singers' formants was different between tenors and baritones. Lower singing CQ values were observed than speaking CQ values in the female singers (P<.001). Furthermore, MEP, MIP, and singing CQ were significantly lower for female singers than for males singers (P<.001). MPT and speaking FO, however, were not significantly different between tenors and baritones.

• Journal of IKEEE
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• v.11 no.4
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• pp.137-144
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• 2007

Fire Control System(FCS) errors can be classified as hardware errors and software errors, and one of the software errors is from target tracking filter which estimates target's location, velocity, acceleration, and so on. It affects function of ballistic calculation equipment significantly. For gun to form predicted hitting point accurately and enhance hitting rate, we need status information of target's future location. Target tracking filter algorithms consist of Single Singer Model, Fixed Gain filter algorithm, IMM, PBIMM and so on. This paper will design IMM tracking filer, which is going to be! applied to domestic warship. Target tracking filter using CV model, Song model and CRT model for IMM tracking filter is made, and tracking ability is analyzed through Monte-Carlo simulation.

• Proceedings of the Acoustical Society of Korea Conference
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• spring
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• pp.119-122
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• 2002

음악을 함에 있어서 정확하고 매력적인 발성을 하는 것도 중요하지만 더욱 기본적이고 중요한 것이 정확한 발음을 내는 것이다. 정확한 발음이 해결되지 않은 상태에서는 아무리 발성법을 꿰뚫고 있다하더라도 많은 사람들에게 자신이 전달하고자 하는 메시지를 제대로 전달하지 못하게 된다. 보통 노래를 잘 부르기 위해서 노래방 같은 곳을 찾아가 노래 연습을 하는 사람들이 많이 있는데, 무엇보다 기본적인 발음이 명확하지 않으면 노래를 잘 부른다고 볼 수는 없는 것이다. 랩을 주로 하는 신세대 가수들의 음악을 들어 보면 자막을 보지 않고서는 무슨 말인지 알아들을 수가 없다. 그들이 노래할 때 입 크기의 변화 없이 입술모양만 변화시키면서 발성하기 때문이다. 음성은 기본적으로 여기성분과 성도성분으로 구분할 수 있다. 성도는 인두강과 구강을 합쳐서 일컫는다. 따라서 입 모양을 어떻게 하느냐에 따라서 같은 말이라도 명료성이 달라지게 된다. 본 논문에서는 이 소리지속시간을 비교 평가하기 위해서 기존가수와 신세대 가수의 한 음절에 대한 지속시간을 비교하여 보았고 8Khz까지의 스펙트로그램을 비교하였다. 비교결과 기존 가수가 신세대 가수에 비하여 말의 의사 전달에 있어서 명료하게 전달 할 수 있다는 것을 알 수 있었다.

• Journal of radiological science and technology
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• v.24 no.2
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• pp.41-47
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• 2001

This study was undertaken to examine the differences between normal vocal technique and abnormal vocal technique because of diseases in respiratory system(emphysema). The breath control for vocalizing with diaphragmatic respiration must be sustained clearly. But if there is an abnormality in lung(emphysema), it is not sustained to hold diaphragmatic respiration when we sing. In order to examine the differences of the width in diaphragmatic respiration among professional singer's case, non professional case and the case of respiratory disturbance, Shimadzu X-ray remote control TV system was used. The results obtained were summerized as follows: When we vocalize, breath control is very important not only to sustain a resonance but also to form focus for being scattered to cranial resonance. We must know the differences between normal and abnormal diaphrogmatic respiration in order to teach vocal technique right. professional singer's vocal technique with Piaphragmatic respiration was better than that compared with non professional case and respiratory disturbance. Non professional case was very similar to the case of respiratory disturvance in diaphragmatic respiration until 10 sec. after full inhalation, but diaphragmatic respiration in the case of 20 sec. after full inhalation was very different.

• IEMEK Journal of Embedded Systems and Applications
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• v.6 no.1
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• pp.16-24
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• 2011

Automotive Radar Systems are currently under development for various applications to increase accuracy and reliability. The target tracking is most important in single or multiple target environments for accuracy. The tracking algorithm provides smoothed and predicted data for target position and velocity(Doppler). To this end, the fixed gain filter(${\alpha}{\beta}$ filter, ${\alpha}{\beta}{\gamma}$ filter) and dynamic filter(Kalman filter, Singer-Kalman filter, etc) are commonly used. Gating is used to decide whether an observation is assigned to an existing track or new track. Gating algorithms are normally based on computing a statistical error distance between an observation and prediction. The data association takes the observation-to-track pairings that satisfied gating and determines which observation-to-track assignment will actually be made. For data association, NNPDA(Nearest Neighbor Probabilistic Data Association) algorithm is proposed. In this paper, we designed a target tracking system developed for an Automotive Radar System. We show the experimental results of the 77GHz FMCW radar sensor on the roads. Four tracking algorithms(${\alpha}{\beta}$ filter, ${\alpha}{\beta}{\gamma}$ filter, 2nd order Kalman filter, Singer-Kalman filter) have been compared and analyzed to evaluate the performance in test scenario.

• International journal of advanced smart convergence
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• v.6 no.2
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• pp.59-64
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• 2017

There are three sorts of voices of female vocalists: soprano, mezzo-soprano, and contralto according to the transliteration. Among them, the soprano has the highest vocal range. Since the voice is generated through the human vocal tract based on the voice generation model, it is greatly influenced by the vocal tract. The structure of vocal organs differs from person to person, and the formants characteristic of vocalization differ accordingly. The formant characteristic refers to a characteristic in which a specific frequency band appears distinctly due to resonance occurring in each vocal tract in the vocal process. Formant characteristics include personality that occurs in the throat, jaw, lips, and teeth, as well as phonological properties of phonemes. The first formant is the throat, the second formant is the jaw, the third formant and the fourth formant are caused by the resonance phenomenon in the lips and the teeth. Among them, pronunciation is influenced not only by phonological information but also by jaws, lips and teeth. When the mouth is small or the jaw is stiff when pronouncing, pronunciation becomes unclear. Therefore, the higher the accuracy of the pronunciation characteristics, the more clearly the formant characteristics appear in the grammar spectrum. However, many soprano singers can not open their mouths because their jaws, lips, teeth, and facial muscles are rigid to maintain high tones when singing, which makes the pronunciation unclear and thus the formant characteristics become unclear. In this paper, in order to confirm the accuracy of the pronunciation characteristics of soprano singers, the experimental group was selected as the soprano singers A, B, C, D, E of Korea and analyzed the grammar spectrum and conducted the MOS test for pronunciation recognition. As a result, soprano singer B showed a clear recognition from F1 to F5 and MOS test result showed the highest recognition rate with 4.6 points. Soprano singers A, C, and D appear from F1 to F3, but it was difficult to find formants above 2kHz. Finally, the soprano singer E had difficulty in finding the formant as a whole, and MOS test showed the lowest recognition rate at 2.1 points. Therefore, we confirmed that the soprano singer B, which exhibits the most distinct formant characteristics in the grammar spectrum, has the best pronunciation accuracy.