Switched capacitor능동여파기 실험에 관한 연구

裵澈秀 관동대학교 1984 關大論文集 Vol.12 No.2

본 논문에서는 signal flow Graph를 이용하여 ladder filter를 S.C. filter로 실현하는 방법을 제시하였다. 그리고 S.C. 적분기에 50% duty cycle 펄스를 인가하고 필터 설계를 S.C.의 Basic building block으로 동작 시켰으며 실험결과는 5차 lowpass S.C. filter로 구현했다. In this paper presents of the ladder filters that realized the principle of the switched capacitor filter using the signal Flow Graph(SFG) approach. The pulse trains of 50% duty cycle re inserted into the S.C. integrator which operates basic building block in the filter design and S.C. filter. Experimental results are given a fifth-order low-pass elliptic S.C. Filter.

마이크로 프로세서에 依한 디지탈 濾波器의 實現에 關한 硏究

裵澈秀 관동대학교 1985 關大論文集 Vol.13 No.3

This paper aims to realize the digital filter using Microprocessor. The use of distributed arithmetic is known to be able to provide increased speeds by avoiaing time-consuming multiplications. High component efficiency is also achieved if the in herent control capabi-lities of the microprocessor are fully utilised, in particular where support horware element are used. By way of examples, Butter-worth and chebyshev low-pass fillter were impleme-nted by use of microprcessor and their characteristics were examined and analyzed.

直交 線型豫測을 利用한 話者認織에 關한 硏究

裵澈秀,孫明哲 관동대학교 1990 關大論文集 Vol.18 No.1

This papaer proposes speaker-recognition method that combines orthogonal parameter which have been used for speaker recognition and DTW which have dynamic propertes. That is, orthogonal parameter can extract a speaker identity effectively and DTW which resolve dynamic time properties of speech signals. Experimental method is comparison of two mehtods. The first is ststistical process of orthogonal parameters, and the secodn is DTW process with orthogonal parameters. To generate the data five speakers were asked to utter the same sentence ten times during the four weeks with a week period. The recognition rate of the first method is 73%, and that of the second method is 83%.

한국어 음성의 통계적 특성 비교

黃英洙,裵澈秀,孫明哲 관동대학교 1990 關大論文集 Vol.18 No.1

In order to perform object measurements of telecommunication systems and devices, it is highly desirable to use the mathematically defined signal reproducing the characteristics of human speech. As the artificial voice must exhibit characteristics as close as possible to real speech, we obtain the statistical characteristics of speech. In this paper, the statistical characteristics are longterm average spectrum, instantaneous amplitude distribution, power envelope spectrum, fundamental frequency and time ratio of voice-unvoice. The statistical characteristics of Korean speech are compared with Japanese's and American English. Such results are useful in adapting speech signal processing technologies developed based on foreign languages.

한국어 파찰음 인식에 관한 연구

이기영,최갑석,배철수,김기운 明知大學校 産業技術硏究所 1988 産業技術硏究所論文集 Vol.7 No.-

In this paper, a recognition of Korean affricate spoken by 3 designated talker, is implemented experimentally, The starting point of affricate is detected from the first predictor coefficient of a 12-pole linear predictive coding (LPC) analysis and phonemic segmentation is done through measuring short time energy and zero crossing rate. By this segmentation method, the duration of an aspirate can be mearsured in order to detect an aspirate or not. After calculated 12-pole LPC coefficients, duration of a aspirate and affricate, recognition experimentation is done using Log Likelihood Ratio. Experimental result is achieved 85% recognition rate by 3 dependent speaker.

자일리톨, 후노란, 제2인산칼슘 및 카제인포스포펩타이드배합껌이 법랑질의 광질재침착에 미치는 영향에 관한 실용실험연구

이병진,배광학,박우철,양준영,황수정,노정,백대일,김종배 대한구강보건학회 2003 大韓口腔保健學會誌 Vol.27 No.4

The object of this study was to investigate caries preventive effect of chewing gum containing xylitol, funoran, calcium hydrogen phosphate and casein phosphopeptide by examining Vickers' hardness and surface roughness with confocal laser microscope. Early caries-like lesions were created using 0.1 M lactic acid-sodium hydroxide buffer(pH 4.0). 8 pieces of 3am diameter bovine enamel specimen with early caries-like lesions were mounted into the recesses of lingual surface of the acrylic mandibular removable appliance. 13 subjects were the appliance for daytime and chewed control and experimental gums 7 times in a day, for 3 days. In order to evaluate the remineralization effect of chewing gum on specimens, we measured vickers' hardness number after chewing gum, 1 day, 2 days, 3 days after and calculated surface roughness immediately after chewing gum. Vickers' hardness number of experimental chewing gum was significantly higher than control in 2 and 3 days after. Surface roughness of experimental chewing gum was significantly lower than control immediately after chewing gum. These results showed that experimental gum has more effective in remineralization of bovine tooth enamel, and it is more effective at immediately after chewing.

원격제어 마이크로콘트롤러의 개발연구

배철수(Chul Soo Bai) 한국정보과학회 1987 정보과학회논문지 Vol.14 No.1

마이크로콘트롤러 시스템을 단일칩 MC68705U3 마이크로컴퓨터를 주축으로 하여 입력 비트를 직접 on-off 제어 또는 원격 신호제어 공용으로 하였고, 원격제어는 MC 14457-MC 1448 원격제어 시스템으로 구성하였다. 원격신호의 검지 또는 부울 대수 제어기능을 독자적으로 이룩할 수 있도록 EPROM 2732에 의한 조합논리기능도 개발하여 보조용으로 부착시켰으며, 지연 RC 회로망에 의하여 4비트의 랫치 기능도 갖게 하였다. 이 시스템은 3개의 부시스템으로 구성되며 각 부시스템은 독자적인 제어목적으로 활용할 수 있는 특징을 가진다. 특히, EPROM 2732에 의한 조합논리를 구현하기 위해 Z-80 트레닝 키트를 이용한 시스템을 구성하여 광범위한 활용 창구를 마련하였다. This paper deals with a development of microcontroller which can control direct bit signals or remote signals. Main controller is constructed by a one-chip microcomputer (MC 68705U3), having subsystems of remote transmitter and receiver. A magnificent system, winch makes EPROM 2732 be able to perform all Boolean equations, is developed with a Z-80 training kit. Latched output bit can also function. Each of three subsystem performs Independent behavior. The whole integrated control system can also be systemized satisfactorily according to the control requirement.

시간축정규화와 WEIGHTING 계수를 포함한 화자인식에 관한 연구

裵澈秀 관동대학교 1989 關大論文集 Vol.17 No.1

Preliminary results of using orthogonal parameters from PARCOR coefficients for speaker recognition problem are presented. The recognition process include standard distance measure for eigenvalues, log likelihood ratio distance measure using DTW for optimal path, and euclidean distance measure for orthogonal parameters and weighted orthogonal parameters, in order to consider dynamic and weighted features of speech signals. To generate the database for experiments, seven speakers were asked to utter the same sentences ten times. Using the MKM(modified K-means method), we extracted the reference pattern from the data obtained from four sessions. Experimental results using euclidean distance measure for orthogonal parameters and for weighted orthogonal parameters according to optimal path, showed 85.7% and 91.4% of recognition rate, respectively.

REMOTE CONTROL MICROCONTROLLER의 개발연구

裵澈秀 관동대학교 1987 關大論文集 Vol.15 No.2

This paper deals with a development of microcontroller which can control direct bit signals or remote signals. Main controller is constructed by a one-chip microcomputer(MC68705U3) with supporting subsystems of remote transmitter and receiver. A magnificient system, which makes EPROM2732 be able to perfrom all Boolean equations is developed with a Z-80 training kit. Latched output bit can be also performed. Any one of three subsystem performs independently oriented behavior. The whole integrated control system can also be systemized satisfactorilly according to the control requirement.

Evaluation of Se Accumulation in the Production of Se-treated Soybean Sprouts and Mungbean Sprouts

Bai, Hong-Sook,Kim, Hyeong-Soo,Bai, Sung-Chul,Kim, Dae-Jin The Korean Society of Food Science and Nutrition 2009 Preventive Nutrition and Food Science Vol.14 No.2

In this study, the selenium (Se) accumulations of soybean sprouts and mungbean sprouts treated with various concentrations of Se-solutions were evaluated, as part of a broader effort to produce Se-enriched variants of the plants. Four levels of sodium selenate ($Na_{2}SeO_{4}$)-dissolved solutions (i.e. 0, T0; 6, T1; 60, T2; and $600{\mu}g/mL$, T3) were prepared and sprayed onto the plants during cultivation. The effect of different spraying periods on Se accumulation was also assessed by watering plant groups once a day for periods of one, two, or three days. Se solution remaining on the surfaces of the plants was washed out by spraying with distilled water on the final day of cultivation. However, the increase of Se accumulation in the plants was found to depend on both Se-concentration and watering period, and the soybean sprouts were determined to accumulate Se more effectively than the mungbean sprouts. Additionally, with regard to Se accumulation in the plants, the period of application of Se solution was determined to be more important than the concentration of the Se solution applied. The averaged total levels of Se-enrichment in whole soybean sprouts at T0, T1, T2, and T3 were 0.26, 65.86, 179.62, and $525.12{\mu}g/dry$ matter (DM) g, respectively, and the relative equations relating Se enrichment in soybean sprouts (Y) against watering days (X) were Y=32.505X-36.17 (T1), Y=88.46X-92.04 (T2), and Y=251.11X-254.9(T3). The averaged total levels of Se-enrichment in the whole mungbean sprouts at T1, T2, and T3 group were 0.05, 3.64, and $101.43{\mu}g/DM$ g, respectively, and the relative equations relating Se enrichment (Y) to watering days (X) for mungbean sprouts were Y=1.67X-1.3467 at T1 and Y=48.035X-46.907 at T2. The results of this study suggest that soybean sprouts and mungbean sprouts enriched with bioavailable Se can be produced on a large scale by Se supplementation, allowing for the development of healthy functional foods such as Se-enriched mungbean sprout soups and salads, Se-enriched functional drink and food additives, and selenium tablets to promote health.