• Journal of Families and Better Life
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• v.11 no.1
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• pp.218-234
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• 1993

A study focused on the wives'managerial behavior and their life satisfaction according to wives'stress level ad their coping behavior. The statistical procedures used were percentile mean cronbach's a T-test F-test cluster analysis. Duncan's Multiple Range test. For the purpose the sample were conducted using questionnairs on 548 housewives that lived in seoul. The major findings wee ; 1) The wives's education level of background variables significantly was differentiated from wives' managerial behavior and their life satisfaction respectively. 2) The wives'stress level and their coping behavior respectively was higher than average. from wives'managerial behavior respectively. 4) The variable i.e. wives'stress level wives'coping behavior significantly was differentiate from wives'life satisfaction respectively In conclusion to improve wives'managerial behavior and their life satisfaction this study suggests we have to try to release or decrease wives'stress level and to do the resonable wives'co-ping behavior.

• 한국생물공학회:학술대회논문집
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• 2005.10a
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• pp.348-352
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• 2005

In this study, fermentation using a rotary biofilm contactor was conducted to improve bacterial cellulose production. We investigated the optimal fermentation conditions by using a newly isolated Gluconacetobacter sp. RKY5 in the rotary biofilm contactor. The optimal total area of discs was found to be 1,769 $cm^2$ at which bacterial cellulose and cell concentration was obtained to 5.52 g/L and 4.98 g/L, respectively. In case of aeration experiment, when the aeration rate was 1.25 vvm, the maximal bacterial cellulose (5.67 g/L) was obtained and cell concentration was 5.25 g/L.

• Parasites, Hosts and Diseases
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• v.40 no.1
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• pp.33-40
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• 2002

Attempts were made to isolate and identify Korean bovine Babesia parasite. Blood samples were collected from Holstein cows in Korea. and Babesia parasites were propagated in SCID mice with circulating bovine red 1)food cells for isolation. The isolate was then antigenically and genotypically compared with several Japanese isolates. The Korean parasite was found to be nearly identical to the Oshima strain isolated from Japanese cattle, which was recently designated as Babesia ovata oshimensis n. var. Haemaphusalis longicornis was the most probable tick species that transmitted the parasite .

• International journal of advanced smart convergence
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• v.1 no.2
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• pp.43-46
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• 2012

We analyzed a periodic thick mushroom structure for use as an artificial magnetic conductor using mode-matching method. The fields in each region were represented by either Floquet modes or waveguide modes. By applying tangential electric and magnetic field continuity conditions and using matrix equations, unknown coefficients and dispersion diagram were calculated. The proposed model can account for the effects of oblique incidence. Simulation time using the method was much faster than the commercial tools. We found that the current method produces accurate results of reflection phase and dispersion diagram.

• International journal of advanced smart convergence
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• v.1 no.2
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• pp.16-19
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• 2012

A modified 4-coil magnetic resonance wireless power transfer (MRWPT) system is proposed. Four coils based on 2-coil system with additional two matching coils were used in this topology. When Tx-Rx distance is changed, the input impedance is changed. However, it can be adjusted by coil parameters of matching coils to maintain impedance matching for maximum efficiency. The equivalent circuit of MRWPT system was analyzed for both transmission function and optimum coupling coefficient of the matching coils. By using four spiral resonant coils, these design considerations was experimentally verified. The measured data agreed well with the calculated data and the transmission function of the proposed system was more efficient than that of conventional 2-coil system.

• Korean Journal of Veterinary Research
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• v.31 no.4
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• pp.515-518
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• 1991

A field study of Lymnaea viridis, the intermediate host of Fasciola hepatica, was carried out in the eastern Chonnam area. The snail was distributed all over the place. Their major habitats were rice paddies (60.8%), followed by brooks (23.2%), irrigation canals (8.6%), and drains (5.6%). Other minor habitats included natural ponds (1.5%), lakes (0.4%), and rivers (0.1%). L. viridis was living in wet clay soil, occasionally entering water. The snails discharged egg masses when the temperature was $15{\sim}20^{\circ}C$, and the number of the snails was the highest late in October. At $9^{\circ}C$ the snails were not found on the mud: they were present deep in water or at the base of rice stubbles. These hibernation sites were discussed with the epidemiology of fascioliasis.

• Transactions on Electrical and Electronic Materials
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• v.6 no.1
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• pp.6-9
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• 2005

Aging characteristics of 0.2PMN-0.8PZT multilayer ceramic actuators (MCA) has been investigated by applying both triangular wave function for unpoled and unipolar wave for poling. P-E hysteresis loops of the MCA had been distorted after about 90 million cycles running in triangular wave function. Effective electromechanical coupling coefficient was calculated in resonant and anti resonant frequencies. And pseudo-piezoelectric constant $d_{33}$ was also estimated from the strain versus electric field characteristics. The crack growth of MCA was clearly observed along to the boundary between electrode and inactive area. That results were thought due to the internal tensile stress came from both actuation of $d_{33}$ mode and motion of Poisson ratio.

• Journal of Nutrition and Health
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• v.19 no.3
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• pp.161-168
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• 1986

In order to investigate the effect of riboflavin on cholesterol and MLHP (methyl linoleate hydroperoxide) -induced fatty liver electron microscopically, riboflavin was given to rate receiving high cholestero and MLHP diet for 4 weeks, 8 week old male Sprague-Dawley rats were administrated diets daily, as following group ; usual diet (control ), riboflavin 910 ug/20gm BW), cholesterol (50mg/gm BW), MLHP(0.1ml/20gm BW), cholesterol plus MLHP, cholesterol plus riboflavin, cholesterol plus MLHP plus riboflavin, by means of intubation into the stomach for 4 weeks. Each group consisted of 10 rats, The liver of the animals were examined ultrstructurally by transmission electronmicroscope. The results wee as follows ; 1) The three group including cholesterol, MLHP, cholesterol plus MLHP feeding resulted in fatty liver. 2) The main finding of the fatty liver were swelling and vacuolation of mitochondria, a lot of lipid droplets, disarrangements and loss of rough endoplamic reticulums. 3) the most striking features in the group of cholesterol plus riboflavin, cholesterol plus MLHP plus riboflavin feeding were decrease of size and number of lipid droplets, mitochondrial swelling and vesiculation, with restortion of rough endoplasmic retriculums. It is postulated with above findings that riboflavin was effective in prevention of cholesterol and MLHP -induced fatty liver.

• Korean Journal of Veterinary Research
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• v.27 no.1
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• pp.109-115
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• 1987

Fecal samples collected from 1,424 cattle were examined for the presence of Coccidia species. A total of eleven species of Eimeria was identified; among the species identified as above E. bovis and E. zuernii appeared with relatively higher infection rates. The infection rate was most prevalent in Korean native cattle (29.07%), followed by the imported beef cattle (18.41%) and the dairy cattle (11. 99%). The number of species within positive samples ranged from one to four.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.7 no.3
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• pp.421-434
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• 1995

A new instantaneous flowmeter for hydraulics by means or cylindrical chokes is developed. In this method the instantaneous flowrate through chokes is predicted in real time from measurement of pressure difference on both sides of cylindrical choke. The experimental study for the flowrate of pulsating flow in a pipe is carried out to measure differential pressure drop by using a strain gauge pressure transducer with data acquisition and processing system. A pulsating flow is verified by a visualization method. In the present study, the flow characteristic variables of laminar pulsating flow are investigated analytically and experimentally in a circular pipe. Characteristic parameters of ratio of inertia term to pressure term($\phi_{t.1}$) and ratio of viscous term to pressure term($\phi_{z.1}$) are introduced to describe the flow pattern of laminar pulsating flow.