• 한국환경과학회지
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• 제18권10호
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• pp.1065-1070
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• 2009

Experimental design for ecological restoration approach was investigated from the P' company's slag dumping area with higher pH value. The degree of pH recovery was measured by the injection of carbon dioxide from the LNG exhaust gas, and the residual carbon, for example, calcium and carbonate which can be controlled by artificial seaweed beds. The degree of adaptability from 3 algaes (Undaria pinnatifida, Sargassum horneri and Ecklonia stolonifera) and uptake nutrient function of Ecklonia stolonifera chosen in the first treatment were measured in the laboratory to determine the transplanting algae in artificial seaweed beds. The higher value of pH was decreased to 7.0~8.5 by injection of LNG exhaust gas with flow rate $20\;m^3/min$. In the experiment design at laboratory, the upper part of frond of Undaria pinnatifida and Sargassum horneri began to decay, and the color changed after 10 days. However, those of Ecklonia stolonifera were after 14~20 days. The uptake rate of nutrient from Ecklonia stolonifera was higher than those of other algaes, and those was similar pattern in the control (e.g. seawater); The DIN concentration uptake of Ecklonia stolonifera was $1.88\;{\mu}g/L/hr$ avg. in leachate, but $2.19\;{\mu}g/L/hr$ avg. in seawater. However, the ${PO_4}^3$-P concentration uptake was $0.18\;{\mu}g/L/hr$ avg. in leachate, but $0.31\;{\mu}g/L/hr$ avg. in seawater. These result indicated Ecklonia stolonifera uptaked these nutrients in the leachate as well as in seawater, and it may suggested for this species to transplant for constructing artificial seaweed beds.

• 한국재료학회지
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• 제21권8호
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• pp.468-475
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• 2011

[ $LaMeO_3$ ](Me = Cr, Co) powders were prepared using the polymeric precursor method. The effects of the chelating agent and the polymeric additive on the synthesis of the $LaMeO_3$ perovskite were studied. The samples were synthesized using ethylene glycol (EG) as the solvent, acetyl acetone (AcAc) as the chelating agent, and polyvinylpyrrolidone (PVP) as the polymer additive. The thermal decomposition behavior of the precursor powder was characterized using a thermal analysis (TG-DTA). The crystallization and particle sizes of the $LaMeO_3$ powders were investigated via powder X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and particle size analyzer, respectively. The as-prepared precursor primarily has $LaMeO_3$ at the optimum condition, i.e. for a molar ratio of both metal-source (a : a) : EG (80a : 80a) : AcAc (8a) inclusive of 1 wt% PVP. When the as-prepared precursor was calcined at $700^{\circ}C$, only a single phase was observed to correspond with the orthorhombic structure of $LaCrO_3$ and the rhombohedral structure of $LaCoO_3$. A solid-electrolyte impedance-metric sensor device composed of $Li_{1.5}Al_{0.5}Ti_{1.5}(PO_4)_3$ as a transducer and $LaMeO_3$ as a receptor has been systematically investigated for the detection of NOx in the range of 20 to 250 ppm at $400^{\circ}C$. The sensor responses were able to divide the component between resistance and capacitance. The impedance-metric sensor for the NO showed higher sensitivity compared with $NO_2$. The responses of the impedance-metric sensor device showed dependence on each value of the NOx concentration.

• 한국약용작물학회지
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• 제22권1호
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• pp.38-45
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• 2014

This study was performed to investigate the physiological responses of Oplopanax elatus by water condition. Drought stress was induced by withholding water for 26 days. The results show that $P_{N\;max}$, SPAD, gs, E and Ci were significantly decreased with decreasing of soil moisture contents. However, AQY and WUE were decreased slightly only at 26 day. This implies that photosynthetic rate is reduced due to an inability to regulate water and $CO_2$ exchange through the stomatal. According to JIP analysis, ${\Phi}_{PO}$, ${\Psi}_O$, ${\Phi}_{EO}$ and $PI_{ABS}$ were dramatically decreased at 21 day and 26 day, which reflects the relative reduction state of the photosystem II. On the other hand, the relative activities per reaction center such as ABS/RC, TRo/RC were significantly increased at 26 day. Particularly, Dio/RC and DIo/CS increased substantially under drought stress, indicating that excessive energy was consumed by heat dissipation. These results of chlorophyll a fluorescence show that the sensitivity changes photosystem II activity. Thus, according to the results, O. elatus was exhibited a strong reduction of photosynthetic activity to approximately 10% soil moisture contents, and JIP parameters could be useful indicator to monitor the physiological states of O. elatus under drought stress.

• 한국재료학회지
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• 제13권2호
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• pp.115-119
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• 2003

The thick film type sensor having Pt/Na Super Ionic Conductor(NASICON) solid electrolyte/Pt/$Na_2$$SO_4$/Pt catalyst system for $SO_2$gas was fabricated by screen-print method. The phase of Na Super Ionic Conductor solid electrolyte sintered at different temperature of 1050, 1150,$ 1250^{\circ}C$ and for different time of 1.5, 2.5, 3.5 hr were investigated by XRD. The Electromotive Force variation of the sensor with $SO_2$concentrations and operating temperatures were investigated. The major phase of Na Super Ionic Conductor film sintered at 115$0^{\circ}C$ for 3.5 hr was sodium zirconium silicon phosphate($Na_3$Zr$_2$$Si_2$PO$_{12}$). The Nernst's slope of Na Super Ionic Conductor sensor for $SO_2$gas with the variation of concentration from 10 to 100 ppm was 167.14 ㎷/decade at the operating temperature of $500 ^{\circ}C$. The increase of oxygen partial pressure was not affected to the variation of Nernst's slope.e.

• 한국가축번식학회지
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• 제21권1호
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• pp.1-7
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• 1997

형질 전환동물의 유선을 이용한 단백질의 생산이 보편화되고 있지만 원하는 단백질이 만들어지기 까지 많은 시간과 노력이 필요하며 기술적인 어려움이 항시 따른다. 그래서 보다 쉽게 재조합된 유전자의 발현 정도를 시험하는 in vitro에서의 시험방법의 개발은 중요한 의미가 있다고 하겠다. 따라서 본 연구에서는 인간의 유방암을 가진 환자의 유선에서 유래된 MCF7 cell line을 이용하여 유선 특징의 유전자 발현을 위한 세포 배양 모델을 개발하고자 하였다. 우선 소의 카제인의 cDNA를 MMTV-LTR의 통제하에 clone하였으며, 이것을 CaPO4의 침전법으로 MCF7 cell에 transfection 시킨 다음, HAT 배양액으로 선발하였으며, dexamethasone으로 유도시키고, 발현되는 정도를 면역 항체를 이용하여 분석하였다. 선발된 세포는 dexamethasone에 의하여 MMTV promoter가 유도되는 것을 확인할 수 있었다. 따라서 MCF7 cell과 같이 다양한 steroid receptor를 가지고 있는 세포는 유선 특정의 유전자 발현을 위한 세포 배양 모델에 유용하게 사용이 될 수 있을 것이다.

• 공학교육연구
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• 제17권3호
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• pp.51-58
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• 2014

The main objective of this research lies in estimating how much importance the educators of professional general education and MSC curriculum put on assessment, and, thereafter, take what support should be provided for the efficient assessment of education. The subjects of this research are educators of professional general education and MSC curriculum in the engineering education enrichment program at the 58 universities out of 72 universities where the accreditation for engineering education is implemented. Accordingly questionnaires were distributed to a total of 58 universities among which 136 questionnaires were collected. The data analysis methods, mean and response sample T test, were used in this research. The following conclusions were drawn from the results of this research. First, tile mean of importance and performance in the 'assessment activities' were relatively high. However, in tile assessment, the assessment performance was relatively lower than the assessment importance. Second, the results of the Importance-Performance Matrix in the 'assessment activities' was analyzed by two ways. First, Analyzed with the scale mean, The result means that Keep up the Good Work (KGW) sector included all factors. Second, Analyzed with the actual mean, The result means that KGW sector included 5 factors A, J, B, D, C. Possible Overkill(PO) sector included factors C, I. Low Priority(LP) sector included 4 factors K, E, H, L. Concentrate Here (CH) sector included factor G.

• 대한한의학회지
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• 제20권1호
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• pp.75-83
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• 1999

To investigate the effects of negative therapy at back meridian points on blood gas components and immune functions in male college students, this study was conducted on treatment types(abdomen group and back group) at three sampling times (before, post-2 wks and post-4 wks) by using $2{\times}3$ factoral design. Blood gas $components(pH,\;PCO_2,\;PO_2,\;HCO_3^-,\;O_2SAT,\;BE)$, red blood cell, hematocrit, hemoglobin, white blood cell and subsets(neutrophil, basophil, eosinophil. lymphocyte, monocyte), total T cells, helper T cells, suppressor T cells, Th/Ts ratio, total B cells, serum immunoglobulin levels (IgG, IgA, IgM, IgD, IgE), Cytokines(Interlukin$-1{\beta}$, -2, -4, 2 receptor, -6 and ${\gamma}$-interferon), NK cells were measured. Collected with data were analyzed statistically by repealed measured ANOVA. The pattern of change between two groups for hematocrit, hemoglobin, suppressor T cells, interleukin-6, ${\gamma}-interferon$, NK cells at post-2 weeks and BE, lymphocyte, basophil at post-4 weeks was significantly different(p<0.05) And also the pattern of change over time for ${HCO_3}^-$(2 wks vs 4 wks), WBC, neutrophil, lymphocyte(0 wks vs 2 wks and 2 wks vs 4 wks) was significantly different(p<0.05). In summary, these data suggest that negative therapy at back meridian points had an effect on blood gas components and immune functions in male college students because practicing negative therapy at back meridian points was not associated with changes of all blood gas components and immune factors but associated with changes of BE, hematocrit, hemoglobin, WBC. neutrophil, lymphocyte, interleukin-6. ${\gamma}-interferon$, NK cells.

• 한국자기학회지
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• 제13권6호
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• pp.251-256
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• 2003

컴퓨터, TV, 의료용기기 등의 모니터로 사용되는 브라운관의 자기장 영향에 따른 특성을 분석하기 위한 자기장 발생 및 측정장치를 개발하였다. 한 변의 길이가 2 m인 정육각형 형태의 3-축 자기장 발생장치, 컴퓨터, 전원공급기 및 자기장 측정기 등을 이용하여 전세계 각 나라별 지구자기장(Earth Magnetic Field, EMF)을 발생시킬 수 있는 대형 3-축 코일 시스템을 설계하고 제작하였다. 각 코일의 코일상수는 X축(E-W)는 30.31 $\mu$T/A, Y축(Ver)는 29.73 $\mu$T/A 및 Z축(N-S)는 30.51 $\mu$T/A이고, 자기장 분해능은 0.01 $\mu$T이었다. 자기장 균일도는 사용되는 편향요크(Deflection York, DY)의 크기를 고려하여 중심에서 12 cm 이내의 공간에서 측정하였고, 균일도는 1 % 내외 이었다.

• The Korean Journal of Ecology
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• 제9권3호
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• pp.149-160
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• 1986

Relationship between the causative organi는 of red-tide and environmental factors had been ecologically dealt wtih. The surveys were conducted at seven station in Jinhae Bay from July to September 1981. The water temperature and salinity had wide range, i.e. 23.3~29.3$^{\circ}C$ and 19G.78~31.29$\textperthousand$, but several chemical factors remarkably fluctuated; dissolved oxygen 102.9~210.4%, COD 2.10~8.96mg$O_2$/l, pH 8.1~9.4, $NO_3$-N trace~1, 052$\mu$g/l, $PO_4$-P 0.6~58.9$\mu$g/l and chlorophyll-a 2.18~290.5mg/$m^3$ in the observed area. The red-tide was mainly caused by two dinoflagellata taxa throughout major outbreaks occurred in July through September. Leading species of red-tide were Gymnodinium nagasakiense belong to the ajor species. During the surveyed period, cell nubers of the causative organisms of the red-tide extensively varied from 3${\times} /10^4$ cells/l to $1.5\times10^7 $cells/l with moths and stations; Prorocentrum spp. 0.3~12.5$\times\10^5$ cells/l in July; Gymnodinium nagasakiense 0.2~5.9$\times10^6 cells/l, 1.1~4.7$\times10^6$ cells/l, and 0.2~15.1$\times10^6$ cells/l in July, August, and September, respectively. Gymnodinium nagasakiense red-tide seemed to be caused by the high water temperature in summer, unusually low salinity due to heavy rains, and the concentrated nutrients for phytoplankton supplied with the municipal sewages from the urban areas and the wastewaters from the industrial complexes.

• 한국환경과학회지
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• 제14권7호
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• pp.675-681
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• 2005

A laboratory experiment was performed to investigate phosphorus and nitrogen removal from synthetic wastewater by intermittently aerated activated sludge process packed with aluminum and silver plate. Three continuous experi­mental processes, i. e. an intermittently aerated activated sludge process(Run A), an intermittently aerated activated sludge process with an aluminum and silver plate packed into the reactor(Run B), and a reactor post stage(Run C) were compared. In the batch experiments, the phosphorus removal time in the reactor packed with aluminum and silver plate simultaneously was faster than that of the reactor packed with only an aluminum plate. More phos­phorus was removed with an increase of NaCl concentration. The pitting corrosion of aluminum does not affect the performance of the biological treatment. The total nitrogen removal efficiency in Run B was $57\%\;and\;43.6\%$ at the HRT of 12 and 6 hours respectively. The effluent $PO_{4-}P$ concentration as low as 1.0 mg/L could be ob­tainable through the continuous experiment in Run B at HRT of 6 hours.