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許萬鐸,金康彦 釜慶大學校 1996 釜慶大學校 論文集 Vol.1 No.2
In this paper, we improved analyzing method of a spectrum envelope¹ using the diffusion filter bank.???? We increased the number of channel of filter bank. By dividing analysis band into subbands, we decreased the number of diffusion process. And, by increasing the number of difference, we got higher selectivity. As a result of them, we reduced the total processing time, and got higher enhancement of discrimination. Through computer simulation, we showed that average recognition rate for single vowels of real voice is 88.3[%]. Hence We confirmed it to be useful for speech recognition which use spectrum analysis to analyze frequency components.⁴
Pb(Ni₁/₃ Nb₂/₃)O₃ 세라믹스에 있어서 페롭스카이트상의 생성과 유전특성
정수태,류지구,김강언 釜慶大學校 1997 釜慶大學校 論文集 Vol.2 No.2
The reaction sequences of the 3PbO-NiO-Nb?O? [PNN1] and 3PbO-NiNb₂O? [PNN2] system and their dielectric properties were investigated. The pyrochlore phase of PNN1 formed in the order of Pb₃Nb₂O?, Pb?Nb₄O₁?? and Pb₃Nb₄O₁₃ according to increasing of a reaction temperature, and that of PNN2 formed only a Pb₃Nb₄O₁₃. The perovskite phase of Pb(Ni₁/₃Nb₂/₃)O₃[PNN] formed at 920℃ through the diffusion of NiO into the pyrochlore phase of Pb₃Nb₄O₁₃ on both PNN1 and PNN2, but PNN1 showed about 40% of the pyrochlore phase and PNN2 showed about 10% of it.When the samples sintered for 1 hour at 920℃ after calined for 1 hour at 850℃, the PNN1 sample showed yet about 18% of pyrochlore phase, While the PNN2 sample showed 100% of perovskite phase. The PNN2 sample(pyrochlore phase free) had a 1.5 times of maximum dielectric constant and a 0.1 times of dissipation loss(room temperature) compared to the PNN1 sample(pyrochlore phase not free)
복합 페롭스카이트 화합물을 고용한 PZT-PNN계 세라믹스의 전계유기압전변위특성
류지구,김강언,정수태 釜山工業大學校 1994 論文集 Vol.36 No.-
The piezoelectric properties and the electric field dependences of a electric field induced strain constant(D??(E)) are investigated as a variation of PE(PE=PFN, PFW, PZN or PMN) in 0.5[Pb(Ti??Zr??)O₃]-0.45PNN-0.05PE system ceramics. The Curie temperature of samples with PFN or PZN were same, ie, 157[℃] which were higher than those of other samples, and piezoelectric strain constant[d??] of samples with PMN or PZN were more than 320×10??[m/V]. Electric field dependences of D??(E) increased as the coercive field decreased, the order of electric field dependence of D??(E) is PMN > PZN > PFN > PFW. D??(E=0) of samples with PMN or PZN were more than about 520×10??[m/V]. D??(E) of all the samples with excepted PMN increased linearly up to 3[kV/cm]. But D??(E) of sample with PMN rapidly increased at about 2.2[kV/cm], since the sample had the lowest coercive field(3.493[kV/cm]) in the other samples. The sample with PZN showed a higher Curie temperature and D??(E) and a good linearty of D??(E), which are considered to be well suited for a piezoelectric actuator materials.
鄭守泰,金康彦,柳志久 釜山工業大學校 1994 論文集 Vol.36 No.-
Vertical Hall devices to dectect a horizontal magnetic field on a chip surface are produced using a bipolar technology. A type B sample is about 1.2 times as sensitive as a type A sample and both samples have good linearity on the Hall voltage in respect to a magnetic fields. A magneto-operational amplifiler(MOP0 is implemented using vertical Hall device, which shows good linearity and switching characteristics. Also we showed that magnetic detections with multifunctions can be accomplished by inserting feedback elements in the MOP.
權榮郁,金一,金康彦,柳志久 釜山工業大學校 1994 論文集 Vol.36 No.-
One of the ultimate purposes in speech recognition is to recognize all of the arbitrary natural-sentences spoken by arbitrary speakers under any noisy environment. This paper describes how HMM is applied to speech recognition and specific parameters are estimated, and vector quantization(VQ) is obtained. Also some experiments of speech recognition are performed for digit that are pronounced four times by twenty Korean adults. The results show that recognition accuracy are 99.7% and 96.0% in closed-test recognition and open-test recognition, respectively.