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에너지 구조재 적용을 위한 알루미늄/섬유강화 복합재의 표면처리
이경엽(K. Y. Rhee),강용태(Y. T. Kang),양준호(J. H. Yang) 한국표면공학회 2001 한국표면공학회지 Vol.34 No.1
In this work, the surface treatment of aluminum/composites (graphite-epoxy composites) was investigated. The surface of composites was treated by Ar? ion beam under oxygen environment. The surface of aluminum was treated by DC plasma. The optimal condition of surface treatment for the composites was determined by measuring the contact angle as a function of ion dose. The optimal treament condition of the aluminum was determined by measuring the contact angle and T-peel strength as a function of mixture ratio of acetylene gas to nitrogen gas. The mixture ratios used were 1:9, 3:7, 5:5, 7:3, and 9:1 The results showed that the contact angle of composites decreased from 81° to 8° as the ion dose increased from zero to 1×10¹? ion/㎠. The optimal condition of ion dose was 1×10¹?ions/㎠. The results also showed that the contact angle of aluminum was a minimum for the mixture ratio of 5:5. Similarly, the T-peel strength was a maximum for the mixture ratio of 5:5, which indicates that the optimal condition of mixture ratio of acetylene gas to nitrogen gas is 5:5.
포도당 이성화 효소에 관한 연구 : 제3보 분리 선정된 균주 효소의 작용에 미치는 금속염(金屬鹽)의 영향에 대하여
서정훈,김종규,기우경,이인구,권태종,우두리 한국농화학회 1969 Applied Biological Chemistry (Appl Biol Chem) Vol.11 No.1
This K-17 strain was not absolutely requiring xylose as an inducer for enzyme formations. The most activity of this enzyme was lost when treated at 75℃. for 30 hours but was not influenced at 70℃ for 70 hours of treatment. The activity of this enzyme was increased by the addition of magnesium ions or cobalt ions in the reaction system. In the studies, we found that the magnesium ions simply activate the enzyme reaction and the cobalt ions do not but protect the enzyme from heat inactivation. And it was also found the phosphate buffer solution was very suitable as glucose dissolving solvent on the enzyme reaction. The mixed carbon source medium containing glucose, fructose, sorbitol, xylose and sucrose was more favorable for enzyme production then a sole carbon source containing medium on the shaking culture method.
이장로,이용호,신용돌,노태환,강일구 숙명여자대학교 자연과학연구소 1993 자연과학논문집 Vol.- No.4
단일박대형의 연자성 시료의 2 kHz까지의 자심손실을 간편하게 측정하는 장치를 제작하였다. 손실을 측정하는 전력계는 애너로그 곱셈기를 사용하였으며, 시료를 포함하는 NFB 회로에 의하여 자속정현파의 조건을 성립시켰다. 수종의 metglas 시료에 대하여 측정한 결과는 적정한 자장 중 열처리 및 자속정현파의 양 조건하에서 공표치와 좋은 일치를 보였다. A core loss measurement system for single strip soft magnetic materials with frequency range of 2 kHz was built. The analog multiplier by monolithic operational amplifier was used for power loss measurement of samples. The sine flux condition was realized with negative feed back loop including the sample. The measurements were done for several metglas samples and the results showed good agreement with published data under the conditions of sine flux and appropriate annealing.
이보성,이창갑,홍원표,옹장우,모상영,홍봉식,김택기 충남대학교 공업교육연구소 1984 論文集 Vol.7 No.2
To cope with an international technical development competition and maintain the continuous economic growth of our country, the role of Chungnam National University, which is sited in the Daedeok Science Town, is training available brains who can perform innovation technology through the triple cooperation of Industry-Institute-University. For this, we have studied the tendency and cooperation system of technical development of developed countries, and prepared the list of available manpower and facilities in the Daedeok Science Town. Also we have investigated the present status of Daejeon Industry -Complex. As a result, for continuous scientific and technical development of our industries, it is recommended that the Science Park, which is similar to Cambridge Science Park, should be build up in the Daedeok Science Town and positively drived the cooperation works of Industry-Institue-University.
김동근,김태성,김광명,이봉암,김국기,임언 대한신경외과학회 1987 Journal of Korean neurosurgical society Vol.16 No.1
The management of cystic astrocytoma is hampered by lack of documentation of the natural history of these lesions and by lack of the evaluation of the treatment, but cystic supratentorial gliomas have the same good prognosis as they occur in the cerebellum. The authors experienced a case of cystic supratentorial astrocytoma, located on right fronto-parieto-temporal lobe and that diagnosed by CT scan and confirmed by histological examination. The lesion showed a large solitary cyst and mural nodule with marked enhancement on computerized tomography. The patient underwent the osteoplastic craniotomy, aspiration of cystic fluid, subtotal removal of mural nodule, and then radiotherapy and chemotherapy. We reviewed the literature of cystic supratentorial glioma and presented our case with treatment.
디프테리아 毒素 投與가 家兎의 脾臟 및 腎臟에 미치는 影響에 關한 實驗的 硏究
金泰雲,李秉喆,孫基燮 충남대학교 의과대학 지역사회의학연구소 1978 충남의대잡지 Vol.5 No.2
Histopathological changes were studied in the spleen and kidney of the rabbits given varyng doses of diphtheria toxin of known streugh subcutaneously and the following results were reported. 1. Injection of toxin produced progressive anorexia, weight loss, hypothermia and paralysis of extremities. 2. Grossiy petechiae were found on the surface of some kidneys. 3. Mickroscopic findings of the spleen were as follows : Destruction of cell in lymphatic follicle, congestion of central artery and its branches and of red pulp space were observed in most cases, the severity of them being roughly proportional to the amount of toxin injected. Mild to moderate leukocyte infiltration and yellow pigment in the red pulp, and fibrin thrombi in both red and white pulp were frequently found, but hemorrhage, epitheroid cell accumulation and phagocytosis were relatively rare. 4. Microscopic findings of the kidney were as follows: Prominent dilatation of glomerular capillaries with fibrin thrombi, mild to moderate tabular degeneration, dilatation, cast formation and interstitial congestion were observed in most cases. Hemorrhage was rare and necrosis was not found. 5. Fibrin thrombi observed in the kidney and spleen suggest strongly that disseminated intravascular coagulation occured during diphtheria intoxication.
Phytase 첨가 및 Extrusion 처리 쌀겨가 함유된 비육돈 사료의 Ca:P 비율이 Ca 및 P 이용성에 미치는 영향
김영길,김인호,이현우,손중천,김은주,권기범,문태현 한국축산학회 1999 한국축산학회지 Vol.41 No.5
An experiment was conducted to determine the effects of dietary Ca:P ratio on phytate P availability in growing pig diet formulated with 30% extruded rice bran and phytase. Four crossbred barrows with average initial body weight of 46㎏ were employed in 24-d metabolism experiment(4 x 4 Latin square). DM digestibility was the highest(P$lt; 0.05) when Ca: P ratio was 1.0: 1.0 in the diet. With increasing dietary Ca: P ratio, the DM digestibility was decreased(P$lt; 0.05). Both nitrogen and ash digestibilities were the highest among the treatments when Ca:P was 1.0:1.0. However, Ca digestibility was improved for pigs fed diet with 1.5 Ca:1.0 P. When dietary Ca: P ratio was 1.0: 1.0, P retention was increased due to decreased P excretion(P$lt; 0.05). Ca intake was increased with increased dietary Ca : P. Therefore, Ca excretion was also increased in pigs fed diet with higher Ca : P ratio. In conclusion, when pigs fed diets containing 30% extruded rice bran supplemented with 500 unit phytase, the recommended ratio of Ca:P was 1.0:1.0.
정하규,권원태,리광훈,심현석,정종혁,이현욱 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-
Thermosonic bonding is a method using heat and ultrasonic for bonding two materials. Since a horn transfers vibration and heat to the bonding material, it is a very important to figure out the heat flow on the horn and the alteration of the dynamic behavior due to the manufacturing error of the horn. In this research, the effect of temperature to the horn system and the effect of tolerance parameters to the amplitude and orientation of the system are performed. The manufacturing error that give most significant the effect on the amplitude and orientation are determined using Taguchi's method. It is found that the durability of the horn is affected by the temperature, while the amplitude and the orientation by the error of the length.