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배경 잡음하에서 스펙트럼 누설현상을 이용한 음성신호의 중심 피치 검출
강동규,배명진,안수길,Kang, Dong-Kyu,Bae, Myung-Jin,Ann, Sou-Guil 한국음향학회 1991 韓國音響學會誌 Vol.10 No.1
지금까지 제안된 피치 수정 앨고리즘들은 남녀노소에 무관하게 폭넓은 피치범위를 검출하기가 어렵다. 조음기관의 물리적 한계성 때문에 피치의 분포도는 일반적으로 중심 피치에 몰려있는 형태가 된다. 이 중심 피치를 본격적인 피치검출 과정에 적용한다면 그 처리과정이 간단해지고 정확도가 개선될 수 있다. 본 논문에서는 스펙트럼 누설현상을 이용하여 중심피치를 정확하게 검출하는 앨고리즘을 제안한다. The pitch estimation algorithms witch have proposed until now are difficult to detect wide range pitches regardless of age or sex. A little deviation are observed with reference to the center pitch in the distribution diagram of pitches, since pitches are characterized by a physical limitation of the coarticulation mechanism. If the center pitches are refered to the accurate pitch extraction procedure, the algorithms will be not only simplified in procedure but also improved in accuracy. In this paper, we proposed an algorithm that the center pitches are accurately detected by using the spectrum leakage phenomenon for the noise speech signals.
김점지(Kim Jum-Ji),강동규(Kang Dong-Kyu),류근걸(Ryoo Kunkul),이윤배(Lee Yoonbae),이종권(Lee Jong-Kwon),이미영(Lee Mi-Young) 한국산학기술학회 2005 한국산학기술학회 학술대회 Vol.- No.-
본 연구에서는 전기영동 겔에 대한 음극전리수의 침투력과 녹차성분에 대한 음극전리수의 용해력을 일반 물과 서로 비교하였다. 음극전리수와 증류수로 제조한 CBB-R 염색시약으로 polyacrylamide 겔 상에서 단백질을 다양한 시간 동안 염색한 후 염색강도를 서로 비교하였다. 그 결과 음극전리수로 제조한 CBB-R 염색시약은 증류수로 제조한 CBB-R 염색시약보다 같은 반응 시간 동안에 먼저 단백질을 강하게 염색시켰다. 뿐만 아니라 25℃에서 음극전리수는 일반 물에 비하여 녹차성분에 대해 극히 탁월한 용해력을 나타내었다.
배선에서의 반단선 및 접촉불량에 대한 열적 전조 DB구축
김두현 ( Doo Hyun Kim ),김성철 ( Sung Chul Kim ),이종호 ( Jong Ho Lee ),강동규 ( Dong Kyu Kang ) 한국안전학회 2009 한국안전학회지 Vol.24 No.4
This paper aims at the precursor analysis and DB development of electrical fires based on thermal and current signals for partial disconnection and poor contact on electric wires through experiments and simulations. Also, DB system required for developing the precursor DB with these data was studied and designed. Firstly, in case of partial disconnection, characteristics were derived and analyzed by experiment and electrical-thermal finite element method(Flux 3D) on the model wires which consist of VCTF and IV electric wires. Based on the characteristics, About 351 partial disconnection precursor patterns were generated by the thermal analysis for electric wire according to deterioration time under normal state and 200% overload state of rated current. Secondly, in order to develop poor contact precursor patterns, temperature value and the current signal were considered. In simulating the poor contact situation on connector area of MCCB, connection torque was changed. Through the experimental analysis, about 251 poor contact precursor patterns were generated. Finally, Using thermal precursor patterns obtained by partial disconnection and poor contact, electrical fire thermal precursor DB was developed.
침수된 전기설비의 누전으로 인한 수중에서의 감전특성에 관한 연구
김두현,강동규 한국산업안전학회 2002 한국안전학회지 Vol.17 No.3
A study on the characteristics of electric shock in fresh water due to the leakage of submerged electric facility is conducted by using a reduced scale model at a scale of 1:10 in laboratory. Electric potential as a function of distance from leakage source, type of the leakage source, magnitude of the source voltage, submerged depth and diameter of a copper rod electrode is measured. On the basis of safety standard, separation for guarantee of safety is determined by the measured potential. Also supposing that body resistance is 500[Ω], the human reaction was estimated by calculation body current for some shock duration. Thus, in this paper the hazard of the electric shock is assessed by introducing representative safety factors, body voltage and body current due to leakage source.
FDTD를 이용한 인체 두부모델의 SAR 분포특성 해석
홍동욱,김두현,강동규 한국안전학회 2004 한국안전학회지 Vol.19 No.2
This paper presents an analysis of SAR(Specific Absorption Rate) distribution characteristics in a head model using FDTD(Finite Difference Time Domain). In this study human head was modelled in four elements-layered structure, consisting of skin, fat, skull and brain. To calculate the electromagnetic fields wihtin the head model, FDTD method was used In the FDTD method, the electromagnetic wave is analyzed by solving a Maxwell's equations repeatedly. For the calculation, distance between power source and head model increased by 10[m]. Power density and incident electric field intensity were calculated Based on the incident electric field, the program which calculate internal electric fields intensity and SAR calculation of the head model were developed The results of developed program using FDTD were compared with those of a commercial programs, which showed the availability and usefullness of the suggested scheme in this paper