• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2002.11a
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• pp.486-489
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• 2002

In this paper, we have investigated characteristics of sub-50nm double gate MOSFET. From I-V characteristics, we obtained =510$\mu$A/${\mu}{\textrm}{m}$ at VMG=VDS=1.5V and VSG=3.0V. Then, the transconductance is 111$\mu$A/V, subthreshold slope is 86mV/dec and DIBL (Drain Induced Barrier Lowering) is 51.3mV. Also, we have presented that TCAD simulator is suitable for device simulation.

• Journal of Korean Society for Quality Management
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• v.46 no.3
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• pp.453-464
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• 2018

Purpose: The purpose of this study is to propose a solution to the case where $V_{50}$ calculation is impossible in the process of bulletproof test. Methods: In this study, we proposed a $V_{50}$ estimation method using logistic regression analysis. Six scenarios were applied by combining the homogeneity of the sample and the speed range. Then, 1,000 simulations were performed per scenario and six assumptions reflecting the reality were applied. Results: The result of the study, it was confirmed that there was no statistical difference between the $V_{50}$ value calculated by the conventional method and the $V_{50}$ value calculated by the improvement method. Therefore, in situations where $V_{50}$ can not be calculated, it is reasonable to use logistic regression analysis. Conclusion: This study develops a methodology that is easy to use and reliable by using statistical model based on actual data.

• Journal of Radiation Protection and Research
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• v.11 no.2
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• pp.146-151
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• 1986

In this paper, general features and measured results of vacuum pressure on the vacuum system of 50 MeV proton KCCH-cyclotron which was installed in Korea Cancer Center Hospital are described. The vacuum system comprises five subgroups and the operating sequences are automatically controlled by EPROM-programmable controller. In normal operation, the obtained ultimate pressures of vacuum groups were $5{\times}10^{-6}mbar(I,\;II),\;2{\times}10^{-6}mbar(III),\;1.2{\times}10^{-5}mbar(IV),\;1.5{\times}10^{-6}mbar(V)$, respectively. It was confirmed that these pressures was enough to accelerate the 50 MeV-proton beam.

• Journal of Plant Biology
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• v.23 no.3_4
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• pp.85-90
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• 1980

The chemical affinities among 12 species of Viola from Jeju Island are investigated by thin-layer chromatography for their MeOH soluble and aglycon parts. They are classified into three groups which are closely related to those of morphological classification: the first allience-Viola hirtipes, V. chaerophylloides, V. meta-japonica, V. keiskei var. okuboi and V. violacea; the second allience-V. xanthopetala, V. ovata-oblonga, V. acuminata var. acuminata and V. grypoceras; and the third allience-V. pachyrhiza, V. phalacrocarpa and V. mandshurica var. ciliata. The first allience consists of the species without stem which have PA value greater than 50% with one another. V. hirtipes and V. chaerophylloides show closer affinity among the taxa of this allience. The second allience consists of the species with stem, of which PA value are about 50%. The third allience consists of the species without stem which have PA values lower than 50% when compared with any other taxa.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.7 no.1
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• pp.21-29
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• 1993

In this paper, we studied the 50% flashover voltage of lightening impulse which affect the most serious damages on the insulation of the electric power network system. Also its V -t characteristics and corona process phenomena of pure $SF_6, N_2, SF_6-N_2$mixtures under the circumstances of nonuniform field gap are researched. Comparing the characteristics of pure $SF_6$ with that of $SF_6, N_2$mixtures, we discussed that breakdown processes and $SF_6, N_2$ mixture's application to economics.As a results, 50% flashover voltage of $SF_6$ 50% - $N_2$ 50% for impulse voltage is higher then that of 80% of pure SF6, measured data and calculated data by equal area law are almost equal from the points of view of V-t characteristics. Therefore, it has been known that $SF_6$ 50% - $N_2$ 50% mixtures can be used as an economic constitution gas of pure $SF_6$, it is verified that corona processes from Lichtenberg figure.

• Journal of Agricultural Extension & Community Development
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• v.6 no.2
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• pp.141-147
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• 1999

This experiments were carried out to development low-priced mushroom culture media, and the results were as follows : Mycerial growth and density of Pleurotus ostreatus in the culture media of 40% of yellow soil, upland soil and lowland soil(each and all) added 60% sawdust and rice bran(80:20, %, v/v) were 89, 88, 68mm/10days in that order. Lentinus edodes were in the media of $40{\sim}50%$ of that added 60% sawdust and rice bran(80:20, %, v/v) were 74, 71, 68mm/10days. Ganoderma lucidum were in the media of $40{\sim}50%$ of that added 60% sawdust and rice bran(80:20, %, v/v) were 98, 94, 89mm/10days in that order.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.10a
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• pp.777-779
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• 2003

In this paper, we have investigated Characteristics of C-V for Double gate MOSFET with main gate and side gate. DG MOSFET has the main gate length of 50nm and the side gate length of 70nm. We have investigated characteristics of C-V and main gate voltage is changed from -5V to ＋5V. Also we have investigated characteristics of C-V for DG MOSFET when the side gate length is changed from 40nm to 90nm. As the side gate length is reduced, the transconductance is increased and the capacitance is reduced. When the side gate voltage is 3V, we know that C-V curves are bending at near the main gate voltage of 1.8V. We have simulated using ISE-TCAD tool for characteristics analysis of device.

• Proceedings of the KIEE Conference
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• 2001.07b
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• pp.992-995
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• 2001

고전압 펄스파워를 이용한 장치들이 환경설비 및 군용기술 등 여러 분야에서 적용되고 있다. 이들 장치는 고전압전원장치가 필수적이다. 고전압 전원 장치는 소형이면서 높은 반복 율로 재충전이 가능하고 안정성 있는 운전이 요구되어진다. 개발된 전원장치는 펄스발생기의 에너지 저장 캐패시터를 50 kV까지 층전할 수 있고 다수의 병렬운전이 가능한 정전류 전원장치이다. 본 전원장치는 200 nF 캐패시터를 6.48 ms이내에 50 kV까지 충전할 수 있도록 설계되어있다. 본 논문에서는 직렬공진에 의해 35 kW, 50 kV의 고전압을 만드는 전원장치의 동작시험에 대한 결과를 보이고자 한다.

• International Journal of Precision Engineering and Manufacturing
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• v.4 no.4
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• pp.45-50
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• 2003

In order to investigate the effect of surface treatment (Anodizing) and rolling on AI 5083-H131 alloy, under hyper velocity impact, a ballistic testing was conducted. Ballistic resistance of these materials was measured by a protection ballistic limit ($V_{50}$)' a statistical velocity with 50% probability of penetration. Perforation behavior and ballistic tolerance, described by penetration modes, were respectfully observed, by $V_{50}$ test and Projectile Through Plates (PTP) test at velocities greater than $V_{50}$. PTP tests were conducted with 0$^{\circ}$ obliquity at room temperature using 5.56mm ball projectiles. $V_{50}$ tests with 0$^{\circ}$ obliquity were also done with projectiles that were able to achieve near or complete penetration during PTP tests. Resistance to penetration, and penetration modes of Al 5052-H34 alloy were compared to those of Al 5083-H 131 alloy.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.22 no.1
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• pp.51-56
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• 2012

In the present study, we investigated the effect of mechanical alloying (MA) on the formation of amorphous VCo system through solid state reaction during ball milling. Two types of powder samples, ${\sigma}$-VCo intermetallic compound and $V_{50}Co_{50}$ powder mixture, were applied as a starting materials. With increasing milling time, a structural characteristics into the amorphous state is distinctly observed from the structural factor and radial distribution by X-ray diffraction. Amorphization has been observed in all two types of samples after the milling for 120 hrs. DSC spectrum of $V_{50}Co_{50}$ powder sample milled for 60 hrs indicates a sharp exothermic peak from the crystallization at $600^{\circ}C$. The structure factor, S(Q) and radial distribution function, RDF(r), observed by X-ray diffraction gradually change into a structure characteristic of an amorphous state with increasing MA time.