제주도 산양에 관한 연구

강면희 ( Myon Hee Kang ) 한국축산학회 1968 한국축산학회지 Vol.10 No.1

An elucidation of the origin of Chejudo goats and a study of their phenotypic characteristics are very important for the purpose of improving the native species in general, as well as of tracing their origin. They are also of interest, because they may be helpful in solving the problems of the origin and descent of Korean people. For the islands of the south-western coast of Korean hold a special significance in that they may have served as stopping-stones for Korean farm animal, and Korean people as well, to occupy their present habitat. It is with these objects in view that present writer has made this research, observing and measuring 148 individuals, as well as making inquiries into relevant historical document. The results of the research may be summarized as follows. 1. It was about 60 years ago, around 1910 that goat feeding was stared in Chejudo, with some heads of native breed introduced from the Korean mainland. The heads of native breed in the island totalled 63 in 1946 and 1900 in 1966. No evidence was found by the present writer that the Chejudo goat was introduced from the south or the west. The present population of goats in the island consists of hybrids of various grades between the native Korean breed and Saanen, with a small exception of pure Saanen breeds distributed around Cheju and Sogwipo and of pure native breeds around Mt. Sanbang. 2. As shown in Table 1, the present writer has made the following observations on the genetic characteristics of the goats in Chejudo. Of 148 beads: a. About 72℃ white and the rest coloured. b. 39% with wattles; 1.5% intersex; 15% with supernumerary teats. c. All have strong resistance io the lumber paralysis(Filariosis Cerebrospinalis). 3. As shown in Table 2, 3, 4, 5, 6, 7 and in Fig. 1, 2, 3, the present writer has obtained the following biometric constants and other statistical data concerning the Chejudo goat. a. The mean value of the withers height in the case of female is 60.51±5.23㎝ and that of the body length 61.28?.38cm. Therefore, the body type of the Chejudo goat is intermediate between that of the Takara native breed and Saanen. b. These differences among the Chejudo goat, the Takara native and Saanen are very significant, statistically showing at value of 27.9 in comparison with Saanen and 10.98 in comparison with the Takara native. c. Its standard deviation and coefficient of variation are comparatively large. d. A comparison of the Chejudo goat with the Japanese inland breeds and with Saanen in terms of standard deviation shows that the body type of the Chejudo goat clearly differs from those of the other two breeds.

한국재래산양의 유원에 대하여

강면희 ( Myon Hee Kang ) 한국축산학회 1967 한국축산학회지 Vol.9 No.1

삼국시대(三國時代)의 수의학(獸醫學) I. 삼국시대(三國時代) 수의학(獸醫學)의 개관(槪觀)과 발전(發展)

강면희,Kang, Myon Hee 대한수의학회 1968 大韓獸醫學會誌 Vol.8 No.2

1. Of the three kingdoms, Koguryo is believed to have had nomadic life, so the livestock husbandry was vigour, but, in Silla and Paikche, only the horse production as military purpose and cattle production as a mean of cultivation had been improved. 2. In the three Kingdoms, the methods of superstition and Shamanism had been used as the mean of curing animals before Haeza, a saintly priest, A. D 590. and after that, shamanism and veterinary science seemed to be combined. We believed that Haeza is to be an initiator of veterinary science in Korea.

잡음 환경에서의 유도 전동기 고장 검출 및 분류를 위한 강인한 특징 벡터 추출에 관한 연구

황철희(Chul-Hee Hwang),강명수(Myeong-Su Kang),김종면(Jong-Myon Kim) 한국컴퓨터정보학회 2011 韓國컴퓨터情報學會論文誌 Vol.16 No.12

유도 전동기는 항공 산업, 자동차 산업 등의 산업 현장에서 중요한 역할을 하고 있으며, 이러한 유도 전동기의 고장으로 인한 피해를 최소화하기 위해 유도 전동기의 고장 검출 및 분류 시스템의 개발이 중요한 문제로 대두되고 있다. 이에 본 논문에서는 정상 및 각종 비정상 상태의 유도 전동기 진동 신호에 대해 부분 자기 상관(partial autocorrelation, PARCOR) 계수, 로그 스펙트럼 파워(log spectrum powers, LSP), 캡스트럼 계수의 평균값(cepstrum coefficients mean, CCM), 멜 주파수 캡스트럼 계수(mel-frequency cepstrum coefficient, MFCC)의 네 가지 특징 벡터를 신경 회로망의 입력으로 사용하여 유도 전동기의 고장을 검출하고 분류하였다. 고장 분류를 위한 최적의 특징 벡터를 찾기 위해 추출하는 특징의 수를 2에서 20으로 바꾸어 가며 분류 성능을 평가한 결과 CCM을 제외한 나머지의 경우 5~6의 특징만으로 분류 정확도가 거의 100%에 가까운 결과를 보였다. 또한 본 논문에서는 실제 산업 현장에서 진동 신호 취득 시 포함될 수 있는 잡음을 고려하여 취득한 신호에 백색 잡음(white Gaussian noise)을 인위적으로 추가하여 실험한 결과 LSP, PARCOR, MFCC 순으로 잡음 환경에 강인한 특징 벡터임을 확인할 수 있었다. Induction motors play a vital role in aeronautical and automotive industries so that many researchers have studied on developing a fault detection and classification system of an induction motor to minimize economical damage caused by its fault. With this reason, this paper extracts robust feature vectors from the normal/abnormal vibration signals of the induction motor in noise circumstance: partial autocorrelation (PARCOR) coefficient, log spectrum powers (LSP), cepstrum coefficients mean (CCM), and mel-frequency cepstrum coefficient (MFCC). Then, we classified different types of faults of the induction motor by using the extracted feature vectors as inputs of a neural network. To find optimal feature vectors, this paper evaluated classification performance with 2 to 20 different feature vectors. Experimental results showed that five to six features were good enough to give almost 100% classification accuracy except features by CCM. Furthermore, we considered that vibration signals could include noise components caused by surroundings. Thus, we added white Gaussian noise to original vibration signals, and then evaluated classification performance. The evaluation results yielded that LSP was the most robust in noise circumstance, then PARCOR and MFCC followed by LSP, respectively.

부분방전 패턴을 이용한 가교폴리에틸렌에서의 트리성장에 관한 연구

강대용(Dae-Yong Kang),오광영(Gunagning Wu),신창면(Chang-myon Shin),박명섭(Myoung-Seop Park),조규복(Kyu-Bock Cho),황보승(Seung Hwang-bo),박대희(Dae-Hee Park) 대한전기학회 1998 대한전기학회 학술대회 논문집 Vol.1998 No.11

유도전동기를 위한 고 신뢰성 고장 검출 및 분류 알고리즘 연구

황철희,강명수,정용범,김종면,Hwang, Chul-Hee,Kang, Myeong-Su,Jung, Yong-Bum,Kim, Jong-Myon 한국정보처리학회 2011 정보처리학회논문지B Vol.18 No.3

본 논문에서는 유도전동기 고장 검출 및 분류를 위한 3-단계 (고장 신호의 전 처리, 고장 신호의 특징 추출, 고장 신호의 고장 유형별 분류) 알고리즘을 제안한다. 먼저 전 처리 단계에서는 저역 통과 필터를 통해 취득한 신호의 고주파 대역에 영향을 미칠 수 있는 잡음 성분을 제거하며, 다음으로는 이산 코사인 변환(discrete cosine transform)과 통계적 방법을 이용하여 고장 유형별 신호의 특징을 추출하고, 마지막 단계에서는 추출된 특징을 입력으로 하는 역 전파 신경 회로망(back propagation neural network)를 이용하여 신호를 고장 유형별로 분류한다. 시스템의 성능을 평가하기 위해 모의실험에 사용된 신호는 유도전동기의 진동 신호로, 정상 및 각종 이상 상태에 대해 8kHz의 샘플링율을 갖는 1초 길이의 데이터를 사용하였다. 모의실험 결과, 제안한 알고리즘은 학습된 상황의 고장 분류에서는 100%의 정확도를 보였으며, 기존의 공분산을 이용한 고장 검출 및 분류 알고리즘과 비교하여 약 50%의 정확도 향상을 보였다. 또한 고장 신호 취득 시 사용하는 센서의 종류나 주변 환경으로 인해 잡음이 추가될 수 있는 상황을 고려하여 취득한 데이터에 백색 가우시안 잡음을 인위적으로 추가한 모의실험에서도 98%이상의 고장 분류 정확도를 보였다. 더불어, 본 논문에서는 TI사의 TMS320F2812 디지털 신호 처리기에 제안한 고장 검출 및 분류 알고리즘을 탑재하여 실제 산업현장에서의 사용여부를 검증하였다. This paper proposes a 3-stage (preprocessing, feature extraction, and classification) fault detection and classification algorithm for induction motors. In the first stage, a low-pass filter is used to remove noise components in the fault signal. In the second stage, a discrete cosine transform (DCT) and a statistical method are used to extract features of the fault signal. Finally, a back propagation neural network (BPNN) method is applied to classify the fault signal. To evaluate the performance of the proposed algorithm, we used one second long normal/abnormal vibration signals of an induction motor sampled at 8kHz. Experimental results showed that the proposed algorithm achieves about 100% accuracy in fault classification, and it provides 50% improved accuracy when compared to the existing fault detection algorithm using a cross-covariance method. In a real-world data acquisition environment, unnecessary noise components are usually included to the real signal. Thus, we conducted an additional simulation to evaluate how well the proposed algorithm classifies the fault signals in a circumstance where a white Gaussian noise is inserted into the fault signals. The simulation results showed that the proposed algorithm achieves over 98% accuracy in fault classification. Moreover, we developed a testbed system including a TI's DSP (digital signal processor) to implement and verify the functionality of the proposed algorithm.

두과 사료목의 육성토에 대한 사료적 가치 비교시험

손용석,강면희 ( Yong Suk Sohn,Myon Hee Kang ) 한국축산학회 1977 한국축산학회지 Vol.19 No.5

An experiment was conducted to compare the nutritive value among the three species of leguminous fodder trees -Robina pseudo acacia, Lespedeza bicolor and Amorpha fructicosa- by determining chemical composition and the effect on growth, feed consumption and feed utilization of growing rabbits. In this experiment, 20 Flemish Giant weaned male rabbits were used for 10 weeks from March 29 to June 6. About sixty-day old rabbits were divided into 4 lots each consisting of 5 rabbits. The experiment was carried out by randomized block design, and data obtained were tested by analysis of variance. Diets containing 0% leaf meal, 20% Robina pseudo acacia, 20% Lespedeza bicolor and 20% Amorpha fructicosa leafmeal were fed to the rabbits. The results obtained were summarized as follows: 1. There was no significant difference in total weight gain or average daily gain, but the 20% Robina pseudo acacia lot and 20% Lespedeza bicolor lot showed faster growth rate than the 0% lot. 2. The rabbits fed 20% Amorplza fructicosa consumed significantly (p$lt;0.01) lower amount of feed, presumably due to its unique odor. 3. No significant difference was found in the feed amount required per unit of gain, but 20% Robina pseudo acacia lot showed the highest feed utilization. 4. The results of this experiment indicate that Robina pseudo acacia and Lespedeza bicolor have much the same effect on the growth of rabbits and can effectively replace the brans of rabbit ration to the level of 20%.

유기용매 중에서 Chlorophyll-a의 흡광 및 형광 (제1보)

이중화,김병수,강정희,박면용,Choong-Hwa Lee,Byong-Soo Kim,Jung-Hee Kang,Myon-Yong Park 대한화학회 1982 대한화학회지 Vol.26 No.4

chl-a는 $5.12{\times}10-6M$ 이상의 농도와 건조된 ethyl ether, benzene, iso-octane중에 소중합체로 존재하고 이 용매에 n-prOH를 소량씩 가할때 단위체로 변함을 확인하였다. 형광은 중합체인 경우에 세게 나타나지만 중합정도에 따라 변하며 단위체인 경우는 약하게 나타났다. 그리고 n-prOH를 용매에 가할 때 흡광과 형광의 ${\lambda}_{max}$은 모두 장파장쪽으로 이동하였다. soret/red band의 비는 흡광도가 감소할수록 작아졌으며 chl-a의 농도에 따른 흡광도는 $1.0{\times}10^{-6}$M 정도의 용액에서 최대값을 나타냈다. The absorbance and fluorescence yields of chl-a vs. concentration of n-prOH in diethyl ether, benzene and iso-octane were shown the characteristic point which chl-a structures are changed to monomer by the solvation of oligomer, and the spectral differences of fluorescence excitation between oligomer and monomer were identified by fluorimetry. All the maximum wavelength of absorbance, fluorescence excitation and fluorescence emission were shifted to longer wavelength. The ratios of soret/red band were depended on the band intensions and the polarities of solution in organic solvents mixed with n-prOH.