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Sol - Gel 법으로 제작한 PbTiO3-PbZrO3-Pb(Ni1/3Nb2/3)O3 압전박막의 특성
윤화중,임무열,구경완 ( Wha Joong Yoon,Moon Yeol Lim,Kyung Wan Koo ) 한국센서학회 1995 센서학회지 Vol.4 No.4
In order to fabricate the piezoelectric thin film of the PZT-PNN ternary compound, the metal alkoxides were used as starting materials. The electrical and crystalline properties of the thin film were evaluated. The X-RD study shows that the crystallization of the film is optimized at 550℃ of sintering temperature. According to the D-E hysterisis curve, the coercive field is 28.8 kV/cm, and the remanent polariztion is 18.3 μC/㎠. The break down voltages of the thin films are 76.0 ∼ 27.0 MV/m. When the sintering temperature is raised, the break down voltage is lowered. As a result of measuring the C-V characteristic curve of the ternary compound piezoelectric thin film, the relative dielectric constants are 406 for the composition (50:40:10), 1084 for the composition (50:30:20), 723 for the composition (45:35:20) and 316 for the composition (40:40:20).
윤화중,정길생,Yoon Hwa-Joong,Chung Kil-Saeng 대한수의사회 1983 대한수의사회지 Vol.19 No.7
The authors made a survey on the species and distribution of internal parasites in domesticated deer. Total 75 specimen which collected from Seoul City, Gyeonggi Do, Kangwon Do and Chung-Nam Province were carried out for the actual condition of parasitic
사료내 곰팡이 발육 억제제의 효과에 관한 연구 - Mold-X의 효과에 관한 연구 -
윤화중,장경진,김태종,원송대,Yoon Hwa Joong,Chang Kyung Jin,Kim Tae Jong,Won Song Dae 대한수의사회 1982 대한수의사회지 Vol.18 No.7
In the experiments of the inhibition of mold growth from October 1, 1981 to March 31, 1982, Mold-X has been shown the effective results as follows; 1. In the storage of the corn and the corn meal contained $12\%$ moisture, the growth of mold wa 본 연구팀은 1981년 10월 부터 1982년 3월까지 시행한 광범위 곰팡이 발육억제제인 Mold-X의 효과에 관한 시험을 시행한 결과 그 성적을 요약하면 다음과 같다. 1. $12\%$의 수분함량이 함유된 옥수수와 옥수수가루 저장에 있어서의 250ppm수준의 Mold-X가 곰팡이의 발육을 억제하였다. 2 수분이 많이 함유된 배지에서 곰팡이의 발육을 억제할 수 있는 Mold-X의 함량은 500ppm수준이었다.
Photoacoustic Spectroscopy에 의한 화합물 반도체의 물성연구
윤화중,금채,양준묵 충남대학교 기초과학연구소 1984 연구논문집 Vol.5 No.-
When chopped light inpinges on some condenced matters such as HgS, HgI_2 and GaSe semiconductors, in an enclosed cell, the acoustic signals are produced within the cell. These acoustic signals were detected by using a gas-phase microphone in order to investigate the physical propesties of the samples. In order to carry out investigation, PA-cell was first disigned and made so as to produce higher sensitivity to acoustic signals. Second, an analysis of the photoacoustic spectrum of the various compounds was carried out to obtain the intensity of the PA-signal in terms of light wave-length and to calculate the energy band gaps occurring according to energy transition. The agreement between the results obtained by this conventional PAS technique and the results obtained by the optical spectrum method was good. In additional analysis conducted on the basis of the R-G theory and the Sze theory are capable of determining the characteristics of energy transition of semiconductors.
尹和重,李元暢,金昌漢 건국대학교 1979 學術誌 Vol.23 No.2
The studies on the morbidity rate of the dairy cows in Korea from October 31, 1977 to November 30, 1978 were intended. The results obtained were as follows : 1.During the period of one year, 11,060 cases of the disease were shown by the clinical examination. Among them, the surgical disease was 7.70%(morbidity rate : 31.8 per 1.000), the disease of internal medicine was 36.31%(146.4 per 1.000) and obstetrical disease was 55.78%(225.0 per 1.000). 2.Foot rot of 21.88% among 873 cases of 30 kinds in the surgical disease showed the highest rate of morbidity Indigestion(dyspepsia) of 13.99% among 4,016 cases of 22 kinds in the disease of internal medicine was the highest rate of morbidity Endometritis of 25.85% among 6,171 cases of 28 kinds in the disease of obstertics was the highest rate of morbidity. 3.Ten kinds of main disease in dairy cows were endometritis (L4.42%), retained placenta(11.33%), mastitis(9.47%), indigestion (5.8%), milk fever (4.45%), ovarian cyst (4.39%), diarrhea (4.35%), pneumonia (3.36%), ovarian hypofunction (2.97%) and enteritis (2.7%), respectively. 4.The strains of causative organism in 320 cases of clinical mastitis were staphyococcus spp, (25%), streptococcus spp. (40%), other bacteria spp. (9%) and fungi spp.(16%). 5.Fifty-one strains of bactria were isolates from the cases of clinical mastitis : Two strains (3.9%) were Phycomycetes spp., twenty-four strains (47.1%) were Ascomycetes spp. and twenty-five strains (49.0%) were Fungi Imperfecti. 6.The sensitivity rate(%) of the bacteria isolated from the cow milk of the clinical mastitis to 9 kinds of antibacterial drug was 14.1% to penicillin-G, 17.8% to streptomycin, 14.9% to erythromycin,20.0% to chloramphenicol, 55.0% to kanamycin, 66.9% to neomycin, 13.8% to tetracyclin, 10.8% to novobiocin and 66.2% to sulfaisodindin.