• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2001년도 추계학술발표대회
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• pp.556-557
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• 2001

생물 계면활성제의 개발을 위해 MNNG(N-Methyl-N-Nitro- NitrMoguanidjne), EMS, UV radiator 등 random mutation을 유도하여 가장 고기능 유화제 생산 균주를 선별하여 다양한 탄소원에 따른 생육도와 유화활성, 유화 활성에 미치는 pH 등 생물 계면활성제의 생산에 관한 조사를 한 결과 Bunker A에서는 유화활성이 원래 균주보다 최고 약 6배까지 증가했으며 표면장력 또한 40.3dyne/cm 에서 34.0dyne/cm 으로 크게 감소되었다.

• Journal of Nutrition and Health
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• 제29권10호
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• pp.1096-1104
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• 1996

This study was performed to evaluate the effect of sodium cholride supplementation on bone metabolism in female rats consuming a low calcium diet. Twenty five female rats were divided into three dietary groups (control Na : 0.1038%, 1% Na : 1.036%, 2% Na : 2.072%). All experimental diets contained 0.27% Ca and were fed to rats with deionized water for 7 weeks. Bone mineral density(BMD) and bone mineral content(BMC) of total body, spine and femur were measured using energy x-ray absorptiometry(DEXA) by small animal software. Then Ca efficiency was calculated from BMD and BMC. Serum Ca, P, Na and urine Ca, P, Na were determined. Urinary pyridinoline, serum ALP were measured to monitor bone resorption. Following 7 weeks, sodium cholride supplemented groups had higher urinary Ca excreteion, urinary pyridinoline, crosslinks value and serum ALP. There was no significant difference in case of serum Ca among all groups. Sodium chloride supplemnted groups had lower Ca effciency of total, spine and femur BMD and BMC than that of control group. In conclusion high salt intake not only increases urinary Ca excretion as urinary Na excretion does but also increase bone resorption and decrease Ca efficiency of each bone. It is been suggested that high salt intake may be harmful for bone maintenance. Therfore, the decrease of salt intake to the level of recommendation would be desirable.

• 한국미생물·생명공학회지
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• 제20권5호
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• pp.559-564
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• 1992

섬유소 자원의 효율적 이용을 위하여 강력한 xylan 분해효소 생산 세균을 분리 및 선발하였으며, 형태학적, 배양학적 생리학적 특성을 확인한 결과 Bacillus sp. N25로 동정하였다. 이 균주에 의해서 생산된 효소를 ammonium sulfate precipitation, DAEA-sephadex A-50, Sephadex G-100 column으로 부분 정제하여 얻은 효소의 열안정성은 $50^{\circ}C$에서 30분간 처리시 80의 역가가 잔존 했으며, pH 안정은 pH 6-8 범위에서 30'C에서 10시간 방치 후에도 안정했으며, cellulose 분해능력은 없었으며, $Hg^{2+}$, $Ag^{2+}$, $Mn^{2+}$에 의해 저해되었다. 그리고 최종분해산물은 주로 xylose이므로 exo-type xylanase로 추정된다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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• pp.549-552
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• 2008

We have developed a novel bipolar host material with both electron and hole transporting characteristics. Since CGH(Cheil Green Host) has some electron transporting characteristics, it shows increased luminance efficiency in device including TCTA and without HBL(hole blocking layer:BAlq). Maximum power efficency of CGH was 27.4lm/W at the device structure ITO/DNTPD(60)/NPB(20)/TCTA(10)/EML(30)/Alq3(20)/LIF(1)/Al. We measured device performance again without HBL. The result of CGH showing 26.0lm/W is outstanding compared to that of CBP showing 19.1lm/W without holeblocking layer. We also measured lifetime and found to be 205hr at 3000nit, that is significant result compared to the life time of CBP device showing 82hr. CGH shows high device performance with holeblocking layer. Moreover, it shows better device performance and life time than those of CBP without holeblocking.

• 한국음향학회지
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• 제16권5호
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• pp.83-91
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• 1997

원자로의 구조적 건전성을 확보하고 사고를 미연에 방지하기 위해서 중성자 잡음 신호를 이용한 진동 감시에는 주기성 도표(periodogram), 평균주기성도표(averaged periodobram), Blackman-Tukey 스펙트럼 추정 등을 이용하고 있으나 본 논문에서는 통계적인 비편향성(unbaised), 일치성(consistency), 효율성(efficiency), 충족성(minimum lower bound)을 고려한 파라미터 모델링 방법 중 AR 모델을 이용하여 원자로 구조물의 최적의 파라미터를 추정하고 진동 감시에 필요한 스펙트럼 분석의 해상도를 높였다. 특히 논문에서는 차수 선정에서 AR 모델의 적절한 차수선정(order selection)을 위하여 자기상관의 lag value을 이용하였다. AR 방법중 Burg 방법이 원자로 구조물의 고유진동수를 추적하는데 가장 효과적이다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2005년도 추계학술대회 논문집 Vol.18
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• pp.267-268
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• 2005

In this paper, the inorganic-organic thin film encapsulation layer was newly adopted to protect the organic layer from moisture and oxygen. Using the electron beam, Sputter and Spin-Coater system, the various kinds of inorganic and organic thin-films were deposited onto the Ethylene Terephthalate(PET) and their interface properties between organic and inorganic layer were investigated. In this investigation, the SiON and Polyimide(PI) layer showed the most suitable properties. Under these conditions, the WVTR(water vapour transition rate) for PET can be reduced from level of 0.57 g/$m^2$/day (bare subtrate) to $1{\times}10^{-5}$ /$m^2$/day after application of a SiON and Polyimide layer. These results indicates that the SiON/PI/SiON/PI/PET barrier coatings have high potential for flexible organic light-emitting diode(OLED) applications.

• 상하수도학회지
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• 제31권5호
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• pp.431-440
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• 2017

The small-scale sewage treatement system with $A^2/O$ process was applied to evaluate applicability for Mongolian sewage, It was designed to have 10 m3/d flowrate and installed in Ulaanbaatar, Mongolia. During over 6month operation BOD, COD, TN, TP removal efficiency were measured and operation condition was optimized. In addition, MLSS concentration its internal circulation rate and DO were adjusted properly. BOD, COD showed average 88 perecent of removal and TN and TP achieved 81 percent and 88 percent removal efficency, respectively. Maxium influent concentration of BOD, COD, TN and TP was 214 mg/L, 300 mg/L, 24.3 mg/L and 5 mg/L respectively, which were decreased to 4.1 mg/L, 5.6 mg/L, 1.3 mg/L and 0.15 mg/L by the test system. This study show possibility tham small-scale sewage treatment system could be a useful system for scattered sewage wastewater treatment.

• 임산에너지
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• 제2권2호
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• pp.1-12
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• 1982

To study tile comparison of aboveground biomass of Pinus rigida Mill. of 18-year-old, plantations located in Whaseong, Yuseong and Wanju district were selected. Ten sample trees in each district selected taking account of DBH distribution were felled carefully to minimize loss of branches and stem analysed by 1m lag segment sectioned from base . The tree height and DBH were measured for sample trees in total growing within $200m^2$ experimental plot. The diagram of oven-dry weight distribution of stem, branch and needle for each 1m segment was constructed. The logarithmic regression equations between dry weight of each component and the two variables, $DBH^2$ and tree height, combined term were presented. The standing crops in the sample stand was estimated to be as much as 23.88, 54.09 and 42.68 tons of dry matter, above ground , per ha in Whaseong, Yuseong anf Wanju district respectively. Annual net production was estimated at 253,657 and 3.65 tons per ha per year respectively. The net assimilation rate was 1.65,1.95 and 1.81 kg/kg/yr in Whaseong, Yuseong and Wanju district respectively. The efficency of leaf to produce stem was 0.99, 1.12 and 1.30 kg/kg/yr respectively.

• 대한화학회지
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• 제43권4호
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• pp.430-437
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• 1999

흐름주입 분석법(FIA)에 의한 간접 요오드화 UV 검출법으로 총 잔류염소를 신속하게 정량하는 방법을 연구하였다. FIA장치를 최적화하기 위해 용리액의 pH, 요오드화 이온의 농도, 혼합 및 반응코일의 길이,시료주입량 및 유속, 온도 및 검출파장에 대한 변화를 관찰하였다. pH 8.3에서 하이포아염소산 이온은 요오드화 이온을 선택적으로 산화시키고 자신은 염화이온으로 환원되었다. 방해이온을 제거하기 위한 가리움제로서 에틸렌다이아민이 가장 좋은 효율을 나타내었다. 하이포아염소산 이온의 검정곡선은 0.03-0.3 mg/L의 농도 범위에서 0.999이상의 직선성을 나타내었고, 검출한계는 0.007 mg/L이었다. 이러한 분석조건하에서 몇몇 전주근교 상수중 총 잔류염소의 농도를 정량하였다.

• 한국안전학회지
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• 제17권4호
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• pp.25-30
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• 2002

This paper demonstrates the effects of dust electrical resistivity on electrostatic precipitability. The effects of gas temperature, velocity and humidity on the collection efficency were considered by used of coal fly ashes from fluidized bed combustion boiler. The experiments for collection efficiency were carried out in the pilot plant. The ashes which have non-spherical geometry and high electrical resistivity were used. Electrical resistivity is an important property for the collection efficiency in the electrostatic precipitators. Fly ash resistivity as a function of temperature up $350{\circ}C$ and water concentration(up to 15%) has been experimentally investigated using the resistivity test equipment consisted of the movable electrode, dust cup, and furnace. As the resistivity of fly ash in the operating temperature($150{\circ}C$) of an electrostatic precipitator was measured higher than $1010{\Omega}{\cdot}$cm, flue gas conditioning in the electrostatic precipitator to reduce the resistivity of fly ash is required.