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과재하중 재하에 따른 역 T형 옹벽의 활동거동에 관한 수치해석
유남재,이명욱,박병수,이승주 江原大學校 産業技術硏究所 2001 産業技術硏究 Vol.21 No.B
This paper is experimental and numerical research about the sliding behavior of cantilever retaining walls resisting surcharge loads. In experimental research, centrifuge model tests at the 1g and 40g-level were performed by changing the location of model footing and its width. Bearing capacity of model footing and characteristics of load-settlement and load-lateral displacement of retaining wall were investigated. Test results of bearing capacity were compared with modified jarquio method, based on the limit equilibrium method with elasticity theory. For the numerical analysis, the commericially available program of FLAC was used by implementing the hyperbolic constitutive relationships to compare with test result about load-settlement and load-displacement of retaining wall, bearing capacity of strip footing.
정명화,김재민,권용성 성균관대학교 기초과학연구소 1995 論文集 Vol.46 No.1
Dense Kondo계인 CeTe와 정상금속인 LaTe의 크기 양질인 단결정을 개선된 Bridgeman방법으로 성장시켰다. 이 단결정을 이용하여 0.05∼8eV의 광범위한 에너지 영역에서 반사율을 측정하여, Kramers-Kronig변환을 통해 광학전도도를 얻었다. 광학전도도의 스펙트럼을 분석한 결과, CeTe와 LaTe의 경우 모두 p-d 전이에 의한 두 개의 피크가 3.6eV와 5.1eV에서 발견되었다. 이 두 피크의 형성 mechanism은 5d-band의 입방결정장에 의한 것임을 알았다. 그리고 CeTe의 경우는 LaTe에 없었던 4f-5d전이에 의한 피크가 0.4eV에서 발견되었다. 이는 XPS 스펙트럼으로부터 얻은 bare 4f-전자의 binding 에너지(약 1.5eV)에 비해 매우 작은 값이다. 이 편차는 local field를 고려한 Lorentz모델을 적용함으로서 잘 설명되었다. 또한, localization의 정도로 약 0.4의 값을 얻었다. 끝으로, 띠내전이의 해석으로부터 LaTe의 경우보다 CeTe의 경우가 전도전자의 유효질량이 무겁다는 사실을 얻었다. 이것으로부터 CeTe의 여기상태인 Γ_8와 전도전자 간의 Kondo 교환상호작용의 에너지가 매우 크다는 것을 알았다. We had grown the high quality single crystals of dense Kondo system CeTe and normal metal LaTe by using the advanced Bridgeman method. The reflectivities of the single crystals were measured in wide energy range from 0.05 to 8eV, and their optical conductivities were obtained using Kramers-Kronig transformation. By the result of their optical conductivity spectra, two peaks due to p-d transition were discovered at about 3.6 and 5.1eV, respectively. The double peaks were explained by cubic crystalline electric field. And in case of CeTe, extraordinary peak due to f-d transition, which LaTe had not, was appeared around 0.4eV. This value was well explained by the Lorentz model considering the local field. The degree of screening due to conduction electrons was evaluated to be about 0.4. The effective mass of conduction electron of CeTe was large compared with that of LaTe. From this, we could obtain the fact that in CeTe, Kondo exchange energy between conduction electron and excited Γ_8 state was very large
光質이 채소作物의 種子發芽와 初期生育 및 除草劑의 活性에 미치는 效果
李政明,金侊來,權臣漢,曺哉銑,朴啓仁,全尙根,李承雨 경희대학교 부설 식량자원개발연구소 1987 硏究論文集 Vol.8 No.-
Studies were conducted to investigate the response of some horticultural plants to various light qualities provided by different kind of materials such as cellophane sheets, EVA, PVC(polyvinyl chloride,. and polyethylene (FE) films of different color. Major findings are summarized as follows. White fluorescence light and red light promoted seed germination of lettuce and inhibited that of radish seeds. Blue light inhibited the seed germination of both types of light-sensitive seeds. The light sensitivity varied considerably depending upon the kind of crops, cultivars, and the seed batches of the same cultivar. The blue light was equally or more strongly effective in inhibiting the seed germination as compared to the farred light. The growth of young seedlings developed from seeds was considerably promoted when grown under orange colored plastic film coverings The growth of larger seedlings was, however. not influenced by the color of plastic films Mulching pepper field with colored PVC film did not show further advantages over the commonly -used black PE film. Herbicidal activity of oxyfluorfen was very strong under natural light or red light conditions, and weak under blue or green light conditions The degree of oxyfluorfen-induced phytotoxicity varied considerably depending upon the light quality and the kind of vegetable crops.
허승덕,정동근,김리석,김광년,강명구,김재룡,김기련 한국음성과학회 2004 음성과학 Vol.11 No.3
This paper introduces a development of an electrical stimulator for auditory stimulation. The electrical stimulator is useful in neurotological diagnosis, audiological evaluation, candidate selection for cochlear implantation, optimal device selection and decision making of MAP strategy for severe-to-profound hearing impaired persons. The development was based on sound parameters of auditory brainstem responses and auditory electrophysiological characteristic such as effective firing of auditory nerve and recording evoked potentials during refractory period of neuron. Besides pulse parameter could adjustable by programming for more varied electrical stimulation evoked response audiometry. Using the electrical stimulator, electrical square pulse was applied to promontory, and electrically evoked auditory brainstem response and electrically middle latency response were successfully recorded in cats.
알코올의 섭취가 흰쥐의 혈액과 간의 지질대사에 미치는 영향
이명숙,김영연,김효숙,김매하,전진순,서진숙,송선미,양영재,윤원손,이미라,이효영,정승현 誠信女子大學校 生活文化硏究所 2004 生活文化硏究 Vol.18 No.-
To investigate the effects of ethanol on the lipid metabolism in blood and liver, twenty one male Sprague Dawley rats had orally taken the 25% alcohol and 50% alcohol by 5g per Kg of weight during 3 weeks after the adjusting period. For the energy balance, 85% sucrose and 45% sucrose was added in control group and 25% alcohol group each. The weight was reduced by alcohol treatment according to the levels, otherwise the weight of liver and heart was little increased in alcohol groups rather than in control without significance. Moreover, RBC, WBC, hemoglobin and hematocrit were increased by alcohol treatment according to the levels without significance. Otherwise, adjusted bilirubin levels by 100g of weight was significantly increased by alcohol treatment dose dependently. Alcohol induced RBC degradation and increased circulated bilirubin because of liver damage. For blood lipid profiles, blood cholesterol was increased in 50% of alcohol group compared to that of 25% and control groups, otherwise, blood triglycerides (TG) was increased by 30% in 25% alcohol groups rather than in control but not significantly different. The hepatic lipid composition, cholesterol levels in alcohol treatment groups was lower than those in control. The hepatic TG was not influenced by alcohol treatment. The two reasons of decreasing hepatic lipids were suggested by 85% sucrose of control for energy balance more synthesized cholesterol and TG than those in 25 or 50% alcohol groups, and by cholesterol and TG could not be synthesized because of liver damage from alcohol.
김명철,이수진,이재일,박창식,전무형,김덕환,임승평 충남대학교 수의과대학 동물의과학연구소 2003 動物醫科學硏究誌 Vol.11 No.-
A 5 year old, 13kg, Jindo dogs was presented with clinical signs of anorexia, weakness and exercise intolerance, and diagnosed as dirofilariasis by hematology, blood chemistry and ultrasonography. In hematology and blood chemistry, the presence of microfilariae in the blood, anemia, leukocytosis, hemoglobinuria and jaundice were revealed. In ultrasonography, heartworms were found in the right ventricle artery and pulmonary artery as structures of hyperechoic dots or streaks. Because of the dog's poor physical status, the owner requested euthanasia. In autopsy, fifty odd of heartworms were ascertained in the right ventricle and pulmonary artery. Tricuspid valve in the orifice of right ventricle and right atrium, and chordae tendineae were deliquesced.