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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.
평판과 Turbo-B 표면에서 HFC32/HFC152a 혼합냉매의 풀 비등 열전달계수
강동규(Dong-Gyu Kang),장철한(Cheol Han Jang),최현주(H.J.Choi),이요한(Yohan Lee),정동수(Dongsoo Jung) 한국해양환경·에너지학회 2012 한국해양환경공학회 학술대회논문집 Vol.2012 No.11
Nucleate pool boiling heat transfer coefficients(HTCs) were measured with HFC32/HFC152a mixture. All data were taken at the liquid pool temperature of 7℃ on a various horizontal surface with heat fluxes of 10 ㎾/㎡ to 100 ㎾/㎡ with an interval of 10 ㎾/㎡ in the increasing order of heat flux. A smooth flat surface and Turbo-B surfaces are used to examine the effect of composition on pool boiling heat transfer coefficients (HTCs). HTCs are measured on a smooth square heater of 9.53 ㎜ × 9.53 ㎜ in a pool of the HFC32/HFC152a mixture. Test results on a smooth flat surface and Turbo-B surfaces showed a reduction of HTCs as much as 45%, 36%, 58% and 57% at 100 ㎾/㎡ from the ideal values on each surface. The reduction of Turbo-B surface in heat transfer were greater than a smooth flat surface.
평판 표면에서 HFC32/HFC152a 혼합냉매의 풀 비등 열전달계수
강동규(Dong-Gyu Kang),이요한(Yohan Lee),정동수(Dongsoo Jung) 대한설비공학회 2013 설비공학 논문집 Vol.25 No.9
Nucleate pool boiling heat transfer coefficients (HTCs) are measured with HFC32/HFC152a mixture at several compositions. All data are taken at the liquid pool temperature of 7°C, on a horizontal plain square surface of 9.53×9.53mm, with heat fluxes of 10 kW/㎡ to 100 kW/㎡ with an interval of 10 kW/㎡, in the increasing order of heat flux. Test results show that the HTCs of these mixtures are up to 45% lower than those of the ideal HTCs calculated by a linear mixing rule with pure fluids’ HTCs, due to the mass transfer resistance associated with non-azeotropic refrigerant mixtures. Pool boiling data show the deduction in HTCs with an increase in GTD of the mixture. The present mixture data agree well with five well known correlations, within 20% deviation.
평판과 촉진관 표면에서 물의 유동 속도에 따른 풀 비등열전달 향상에 관한 실험 연구
강동규(Dong Gyu Kang),이요한(Yohan Lee),박기정(Ki-Jung Park),정동수(Dongsoo Jung) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
In this study, pool boiling heat transfer coefficients (HTCs) and critical heat fluxes (CHFs) are measured on a smooth square flat copper heater of 9.53 x 9.53 ㎜ at 6 0℃ in a pool of pure water. For flat heater experiments, a smooth flat surface and 26 fpi low fin are used to see the change in HTCs and CHFs according to the surface characteristics. HTCs are taken from 10 ㎾/㎡ to critical heat flux for all surfaces. Test results with low-fin surface showed that CHFs are greatly improved, as compared to that of a plain surface as various fluid velocities, 0.00, 0.10, 0.15, 0.20 ㎧, in pure water. The HTCs of tested each surfaces are increased over 5% up to 112% as fluid velocities at 0.10, 0.15, 0.20 ㎧ as compared to that of stoped water. Judging from these results, it can be said that low-fin tube with the variation of flow velocity of water can be used in heat transfer applications at high heat fluxes.
Kefir 와 Yogurt 로부터 분리된 Lactobacillus spp. 의 Probiotic 활성과 Pulsed Field Gel 전기영동에 의한 균주 동정
강동규(D . G . Kang),조중근(J . G . Cho),윤영호(Y . H . Yoon) 한국낙농식품응용생물학회 1998 Journal of Dairy Science and Biotechnology (JMSB) Vol.16 No.1
N/A Determinations on the probiotic activities of Lactobacillus spp. from yogurt and kefir and the strain identification studies were carried out by pulsed gel electrophoresis of genomic DNA, the following results were obtained: 1. A prominent antimutagenicity against 2-Nitrofluene by Lactobacillus plantarum CU 722, 685, and 735 was revealed and they possessed same genomic structures by PFGE. 2. L. acidophilus CU 674 showed the strongest cholesterol assimilation activity of 60.27 % and almost all the L. acidophilus did not show the cholesterol assimilation activity, which was strain dependent. 3. L. acidophilus CU 806 from domestic yoghurt showed a strong antagonistic activity against pathogenic Staphylococcus aureus ATCC 3939, which was strain dependent. 4. Grouping of Lactobacillus acidophilus strains into five types, and into three types of L. plantarum was possible by pulsed field gel electrophoresis pattern of the genomic DNA, probiotic activities of the homologous PFGE pattern sustained in different kind of fermented products.
수열원 히트펌프 용 HFC32/HFC152a 혼합냉매의 성능평가
강동규(Dong gyu Kang),김욱진(Wook-Jin Kim),정동수(Dongsoo Jung) 대한설비공학회 2012 설비공학 논문집 Vol.24 No.5
In this study, performance of HFC32/HFC152a mixture is measured in the composition range of 20 to 50% R32 with an interval of 10% for the comparison with the conventional HCFC22 in water-source heat pumps. Tests are carried out under the same capacity in a heat pump bench tester equipped with a variable speed compressor at the evaporation and condensation temperatures of 7/45℃ and -7/41℃ for summer and winter conditions, respectively. Test results show that the compressor power of the HFC32/HFC152a mixture is 13.7% lower than that of HCFC22 while the coefficient of performance(COP) the HFC32/HFC152a mixture is 15.8% higher than that of HCFC22. Hence, from the view point of energy efficiency, the HFC32/HFC152a mixture is excellent as compared to HCFC22. Compressor discharge temperatures of HFC32/HFC152a mixture are increased up to 15.4℃ as compared to that of HCFC22. The amount of charge for HFC32/HFC152 mixture decrease up to 27% as compared to that of HCFC22. Overall, HFC32/HFC152a mixture is an excellent long term candidate to replace HCFC22 in water-source heat pumps.