• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2000년도 제1회 학술대회 논문집
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• pp.39-40
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• 2000

STN LCDs on Plastic Film substrates for mobile communication devices have been researched and developed at KETI in KOREA. The Plastic Film substrate is so weak to heat and pressure that its fabrication process is limited to $110^{\circ}C(Tg)$. In order to maintain uniform pressure on Plastic Film substrate we used newly designed jig and fabrication process. Electro-optical characteristics are better than or equivalent to those of typical glass LCD though it is thinner, lighter-weight, and more robust than glass LCD.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2011년도 춘계학술대회 논문집
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• pp.39-40
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• 2011

• 전자통신동향분석
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• 제36권3호
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• pp.34-40
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• 2021

For developing a switching device of a new concept that cannot be implemented with a semiconductor device, we introduce the Mott insulator-metal transition (IMT) phenomenon occurring out of the semiconductor regime, such as the temperature-driven IMT, the electric-field or voltage-driven IMT, the negative differential resistance (NDR)-IMT switching generated at constant current, and the NDR-based IMT-oscillation. Moreover, the possibilities of new concept IMT switching devices are briefly explained.

• Nuclear Engineering and Technology
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• 제55권8호
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• pp.2802-2811
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• 2023

In a first-of-its-kind study, terrestrial radionuclide concentrations were measured in 35 topsoil samples from the outskirts of Dhaka using HPGe gamma-ray spectrometry to assess the radiological consequences of such a vast number of brick kilns on the plant workers, general as well as dwelling environment. The range of activity concentrations of ²²⁶Ra, ²³²Th, and ⁴⁰K is found at 19 ± 3.04 to 38 ± 4.94, 39 ± 5.85 to 57 ± 7.41, and (430 ± 51.60 to 570 ± 68.40) Bq/kg, respectively. ²³²Th and ⁴⁰K concentrations were higher than the global averages. Bottom ash deposition in lowlands, fly ash buildup in soils, and the fallout of micro-particles are all probable causes of the elevated radioactivity levels. ¹³⁷Cs was found in the sample, which indicates the migration of ¹³⁷Cs from nuclear accidents or nuclear fallout, or the contamination of feed coal. Although the effective dose received by the general public was below the recommended dose limit but, most estimates of hazard parameters surpass their respective population weighted global averages, indicating that brick kiln workers and nearby residents are not safe due to prolonged exposures to terrestrial radiation. In addition, the soil around sampling sites is found to be unsuitable for agricultural purposes.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 C
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• pp.2131-2133
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• 2004

모세관 전기영동 및 전기화학적 검출 시스템을 마이크로 시스템에 적용하여 ITO 유리기판과 polydimethylsiloxane (PDMS)로 제작하였다. 제작된 모세관 전기영동 및 전기화학적 검출 시스템은 일회용으로 사용가능하며 전기화학적 검출에 아주 적합한 특성을 보인다. 모세관 전기영동 및 전기화학적 검출 시스템은 주입과 분리 채널 (80 ${\mu}m$ 폭 ${\sim}$ 40 ${\mu}m$ 깊이)을 가진 PDMS 층과 유리기판 위에 검출 전극으로 사용되는 ITO가 형성된 층으로 구성된다. PDMS 층과 ITO 유리 기판은 UV-$O_3$ cleaner를 사용하여 접합하였다. 완충용액은 10 mM 2-(N-morpholino)ethanesulfonic acid (MES)를 사용하였고 분석물질은 1 mM 농도의 dopamine과 1 mM 농도의 catechol을 사용하였다. 60 V/cm 전계로 주입 및 분리를 하였으며 작업전극과 기준전극 간의 전위는 +600 mV로 유지하며 분석물질의 농도에 비례하는 전류량법으로 측정하였다. 전기화학적 검출 회로는 천기영동 전계의 간섭으로부터 분리하였다. 10 mM MES 완충용액에서 바탕 전류의 크기가 ${\sim}$10 pA 일 때 측정전류 값은 10 nA이다. 측정된 피크 값은 기존의 Au 전극과 비교하여 선택성, 감도, 분해능이 유사한 특성을 보여준다.

• Asian-Australasian Journal of Animal Sciences
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• 제22권12호
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• pp.1614-1619
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• 2009

The present study was conducted to observe the effect of increased osmolality of basic tris extender supplemented with trehalose and sucrose on post-thawing quality (motility, progressive motility, viability, the rate of acrosome abnormality, total abnormality and membrane integrity) of Markhoz goat spermatozoa. Fresh semen samples were evaluated for motility and sperm concentration. Only semen samples with motility more than 70% and sperm concentration higher than $3{\times}10^{9}$ sperm/ml were used for cryopreservation. In Exp. 1, trehalose (50, 75 or 100 mM) and sucrose (40, 60 or 80 mM) were added to a basic tris diluent. Based on the results of experiment 1, the goal of Exp. 2 was to investigate the combinational effects of the highest and lowest concentrations ($T_{100}+S_{80}$ or $T_{50}+S_{40}$) of trehalose and sucrose. As the control, semen was diluted and frozen in the tris diluent without trehalose or sucrose. The results in Exp. 1 showed that all evaluated spermatozoa characteristics improved significantly after freezing and thawing (p<0.05) and at the same time the increase of trehalose and sucrose concentrations in basic extenders was seen, with the best results obtained for extenders containing 70 and 100 mM trehalose and 80 mM sucrose. Comparing these results with those of control diluents, the effects of supplementation were significantly (p<0.05) better. In Exp. 2, the results showed no significant differences (p>0.05) between $T_{100}+S_{80}$ and $T_{50}+S_{40}$ extenders, but the results of $T_{50}+S_{40}$were slightly better than obtained with $T_{100}+S_{80}$ diluents. Furthermore, the results of this experiment indicated that the sperm characteristics in the isotonic control extender were significantly (p<0.05) lower than examined extenders. In conclusion, the results of this study indicated that goat sperm can tolerate hypertonic trehalose and sucrose solutions better than isotonic control diluents in the freezing period. In particular, these positive effects have been shown for acrosome integrity, which is very important for the fertilization capacity of sperm. The data indicated that addition of trehalose plus sucrose to the freezing extender can be recommended for cryopreservation of goat spermatozoa, but more data is needed on pregnancy rate, acrosome reaction and IVF to ascertain the real effect.

• Asian-Australasian Journal of Animal Sciences
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• 제14권10호
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• pp.1360-1366
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• 2001

The aims of this study were first to evaluate the effects of different levels (20, 40 and 100%) and sources (follicular size: large, >7 mm; medium, >5-7 mm; small, 3-5 mm) of porcine follicular fluid (pFF) on the in vitro maturation (IVM) of porcine oocytes, and the effects of fertilization treatments and different culture conditions on development of fertilized oocytes were also investigated. No differences in the maturation (63.6-76.6%) and cleavage (24.8-34.3%) rates were observed among the 20,40 and 100% pFF groups (p>0.05). The cleavage rates of oocytes cultured and fertilized in 40% and 100% pFF maturation media were significantly higher than those fertilized in m199-NBCS (51.0-61.2% vs. 12.8-31.8%. p<0.05), regardless of sources of the pFF. When oocytes were fertilized in m199-NBCS followed by culture in rabbit oviducts for 4 days, the cleavage rate in 40% pFF group was better than that in 100% pFF group (46.9% vs. 32.5%, p<0.05). Two oocytes recovered from the oviducts in the 40% pFF group developed to blastocysts after IVC. However, none developed to blastocysts when fertilized in the IVM medium after being transferred to rabbit oviducts. In conclusion, addition of pFF accompanied with gonadotropins (FSH, LH) in IVM medium enhanced maturation and cleavage rates of porcine oocytes. Direct addition of sperm suspension to IVM medium may be an alternative to simplify the fertilization procedures and to reduce the mechanical lesion during manipulation. Furthermore, rabbit oviducts provide a better environment for the in vitro fertilized oocyte developing to the morula and blastocyst stages.

• 한국가금학회지
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• 제32권4호
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• pp.291-300
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• 2005

남은 음식물에서 Aspergillus oryzae(AO)의 유용한 배양조건(시간, 수분함량, 접종균수)을 구하기 위하여 2가지 실험과 닭에서 그 배양물의 영양소 이용율을 구명하기 위하여 본 시험을 수행하였다. <시험 1> 적정 배양시간과 접종균수의 측정을 위하여 수분함량을 30, 40, 50, $60\%$로 정하였다. 잔반 사료에 접종하는 seed로서 1mL Aspergillus oryzae(AO) $(1.33\times10^5\;CFU/mL)$를 이용하였다. 배양을 위한 적정 수분함량은 $40\~50\%$였으며 배양시간은 72시간 이상이었다. 계속하여 AO 균수에 의한 효과를 결정하기 위해 AO seed 0.25, 0.50, 0.75, 1.00mL를 남은음식물 사료에 접종하였다. AFW의 AO균수를 비교하기 위하여 72시간과 96시간 배양하였으나, 접종량에 따른 유의차는 없었다. 다시 수준을 낮추어 0.01, 0.05, 0.10mL를 접종하고 72시간과 96시간동안 배양한 결과, 72시간 배양 AO colony 수는 0.1 mL 접종 처리 구에서 가장 많았다. <시험 2> FW의 배양조건을 결정한 후에, 20수의 5주령 Hubbard종을 공시하여 소화율 시험을 수행하였다. 처리구는 T1-대조구, T2-기초사료 $60\%$+건조잔반 $40\%$, T3-기초사료 $60\%$+건조잔반 $20\%$+AO균 접종 건조잔반 $20\%$, T-4-기초사료 $60\%$+AO균 접종 건조잔반 $40\%$ 처리구 등 총 4처리구, 처리구당 5반복씩 20수를 인공항문 장착하여 소화율을 조사하였다. 영양소 소화율에 있어 일반성분과 아미노산은 대조구에 비해 T2 처리구가 전성분에서 낮았고(p<0.05), AFW(T3, T4)처리구에 비해 조지방과 인의 소화율에서 차이를 보였다(p<0.05). T3와 T4는 T2에 비해 조섬유 및 조회분의 소화율이 증가하였다(p<0.05). 대조구는 T3와 T4에 비해 필수아미노산인 arginine, leucine, phenylalanine의 소화율이 높았으나(p<0.05), T3와 T4 처리구는 T2 처리구에 비해 필수아미노산 arginine, lysine 및 thereonine과 비필수아미노산 alanine의 소화율이 개선되었다(p<0.05). 이러한 결과들로부터 건조 잔반의 AO 배양조건 구명과 영양소 이용율 시험을 통해 FW사료의 품질이 기초사료에 비해 영양소 이용율이 낮고, AFW 사료가 AO에 의해 개선될 수 있음을 시사한다

• 한국정밀공학회지
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• 제13권8호
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• pp.40-51
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• 1996

This paper describes some research works of computer-aided design of blanking and piercing progressive die for stator and rotor parts. An approach to the system is based on knowledge based rules. The deveolped system is composed of six modules such as main program, input and shape treatment, production feasibility check, strip layout, die layout and drawing edit module. Using this system, design parameters ( geometric shapes, die and punch dimensions and dimensions of tool elements) are determined and output is gen- erated in graphic from. Knowledges for tool design are extracted from the plasticity theories, handbooks, relevant references and empirical know-hows of experts in blkanking companies. The developed system provides powerful capabilities for process planning and die design of stator and rotor parts.

• 자원환경지질
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• 제11권3호
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• pp.109-114
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• 1978

Seismic and side scan sonar traverses in the inner part of Gyeonggi bay was completed during 1976 and 1977 to depict the distribution and thickness of holocene sediments. Special attention was given to the locations of sand and gravel resources. The area of sand sediments is about $50km^2$ mostly distributed in outer part of inner bay. Maximum thickness of sand sediments is 40m with the averge of 10-15m. Tidal current prevailing in the bay seems to be the most important agent modifying the distributions and thickness of sediments in the Gyeonggi bay.