• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2009.10a
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• pp.297-300
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• 2009

본 연구는 Knife형 전극을 사용하여 $SF_6$와 $N_2/O_2$의 혼합체적률이 각각 100:0, 80:20, 60:40인 혼합가스에서의 캡 변화에 따른 연면방전 특성을 연구할 목적으로 교류고전압 인가 시 압력 (P), 전극간거리 (d) 및 사용된 가스의 변화에 따른 절연파괴특성을 연구 하였다. 본 연구를 통해 챔버 내의 P와 d가 증가할수록 연면절연파괴전압은 상승하다가 일정한 압력 이상에서는 포화하는 경향을 보였고, $N_2:O_2$의 혼합체적률이 100:0인 경우는 $SF_6$의 37%, 80:20은 47%, 60:40은 46%로 나타났다. $N_2:O_2$ 혼합가스 중에서 체적혼합비율이 80:20인 경우가 연면절연내력이 가장 좋게 나타났다.

• Proceeding of EDISON Challenge
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• 2013.04a
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• pp.224-227
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• 2013

본 연구에서는 S/D이 n+/n+로 구성된 CNT-MOSFETs, 금속으로 이루어진 SB-CNTFETs와 p+/n+로 구성된 CNT-TFETs에 대한 각각의 $I_d-V_g$ 특성과 포텐셜 프로파일을 확인하였다. 그리고 각 소자의 특성 및 특징을 연구하고, 이 중에서 BTB에 가장 큰 영향을 받는 CNT-TFETs의 특성을 $V_{DS}$, 분자 비대칭성과 $T_{ox}$에 따른 특성 변화를 연구하였다. 그 결과 예상과 다르게 오히려 작은 $V_{DS}$와 큰 $E_g$을 가질 때, 향상된 SS를 가진다는 것을 확인 할 수 있었다. 특히, (7,0) CNT-TFETs에서 비록 $I_d$는 작지만, SS를 57mV/dec까지 개선할 수 있었다. 또한, $T_{ox}$를 얇게 하면, 비록 60 mV/dec 이하의 결과는 보여주지 못했지만, SS와 Ion 모두 개선할 수 있음을 확인할 수 있었다.

• Journal of the Korean Society for information Management
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• v.6 no.1
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• pp.15-36
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• 1989

The r a p i d i n c r e a s e o f microcomputer technology has r e s u l t e d i n t h e broad a p p l i c a t i o n t o various f i e l d s . The purpose of t h l s paper 1s to design a computerized r e t r i e v a l system f o r nuclear information m a t e r i a l s using a microcomputer.

• Journal of Bio-Environment Control
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• v.26 no.4
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• pp.340-345
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• 2017

Carrot leaves have many nutrients as well as roots, which will increase the demand for carrot leaves in the future. This study was carried out by dividing into two stages: high temperature and low temperature periods, in order to investigate the possibility of cultivation of carrot leaves and the composition and EC of the nutrient solution for growth and quality of carrot leaves. Composition of nutrient solution($NO_3-N:16.0$, $NH_4-N:1.0$, P: 1.0, K: 11.0, Ca: 2.0, Mg: 1.0, $SO_4-S:1.0mM{\cdot}L^{-1}$) developed by analysis of plant. In the high temperature range (From June $29^{th}$ to Sep. $8^{th}$, 2016), the concentration of the developed nutrient solution (JNU) were 1.0, 2.0, 3.0, and $4.0dS{\cdot}m^{-1}$ and the concentration of nutrient solution of Japanese Horticultural Station(JHS) $2.0dS{\cdot}m^{-1}$ was used for comparison. In the low temperature range (From Dec. $31^{st}$, 2015 to Feb. $29^{th}$, 2016), the concentration of the developed nutrient solution 1.0, 2.0, and $3.0dS{\cdot}m^{-1}$ were used. Growth was investigated in root fresh and dry weights, shoot fresh and dry weights, leaf number, and leaf area of carrot. In the high temperature range, the leaf area and shoot fresh and dry weights were good at 1.0 and $2.0dS{\cdot}m^{-1}$. The sugar content of the root was the highest at the EC $2.0dS{\cdot}m^{-1}$, and the chlorophyll content was the highest at the EC $4.0dS{\cdot}m^{-1}$. In the low temperature range, The shoot fresh and dry weights were the highest at EC 1.0 and $2.0dS{\cdot}m^{-1}$. There was no significant difference in sugar content and chlorophyll content. As a result, from the viewpoint of growth and quality of carrot, it is good to cultivate EC 1.0 and $2.0dS{\cdot}m^{-1}$ in high temperature period and low temperature period, but EC $1.0dS{\cdot}m^{-1}$ is economical perspective such as fertilizer input.

• Proceedings of the Korean Nuclear Society Conference
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• 2005.10a
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• pp.203-204
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• 2005

• Proceedings of the Korean Magnestics Society Conference
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• 2007.05a
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• pp.150.1-150.1
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• 2007

• Investigative Magnetic Resonance Imaging
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• v.26 no.2
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• pp.125-134
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• 2022

Purpose: The aim of this study was to investigate the change in signal sensitivity over different acquisition start times and optimize the scanning window to provide the maximal signal sensitivity of [1-¹³C]pyruvate and its metabolic products, lactate and alanine, using spatially localized hyperpolarized 3D ¹³C magnetic resonance spectroscopic imaging (MRSI). Materials and Methods: We acquired 3D ¹³C MRSI data from the brain (n = 3), kidney (n = 3), and liver (n = 3) of rats using a 3T clinical scanner and a custom RF coil after the injection of hyperpolarized [1-¹³C]pyruvate. For each organ, we obtained three consecutive 3D ¹³C MRSI datasets with different acquisition start times per animal from a total of three animals. The mean signal-to-noise ratios (SNRs) of pyruvate, lactate, and alanine were calculated and compared between different acquisition start times. Based on the SNRs of lactate and alanine, we identified the optimal acquisition start timing for each organ. Results: For the brain, the acquisition start time of 18 s provided the highest mean SNR of lactate. At 18 s, however, the lactate signal predominantly originated from not the brain, but the blood vessels; therefore, the acquisition start time of 22 s was recommended for 3D ¹³C MRSI of the rat brain. For the kidney, all three metabolites demonstrated the highest mean SNR at the acquisition start time of 32 s. Similarly, the acquisition start time of 22 s provided the highest SNRs for all three metabolites in the liver. Conclusion: In this study, the acquisition start timing was optimized in an attempt to maximize metabolic signals in hyperpolarized 3D ¹³C MRSI examination with [1-¹³C] pyruvate as a substrate. We investigated the changes in metabolic signal sensitivity in the brain, kidney, and liver of rats to establish the optimal acquisition start time for each organ. We expect the results from this study to be of help in future studies.

• Korean Journal of Veterinary Service
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• v.37 no.4
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• pp.233-240
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• 2014

Salmonella spp. are one of the most common bacteria that causes heavy losses in swine industry and have implications for public health. In this study, the correlation between Salmonella seroprev-alence on farms and the isolation rate from slaughtered pigs was analyzed and the antimicrobial resistance of the isolated Salmonella spp. was investigated. A total of 3,001 serum samples for ELISA were collected from 17 farms during two consecutive years (2012-2013). The mean values of ELISA OD% for each 8 age groups were as follows; gilt 27.83 (n=472), sow 23.75 (n=367), 150 days (d) of pig 16.53 (n=278), 130 d 11.87 (n=366), 100 d 9.46 (n=378), 20 d 9.17 (n=394), 70 d 6.56 (n=382), 40 d 3.72 (n=364). From July 2013 to January 2014, a total of 53 (8.0%) Salmonella strains were isolated from 665 slaughtered pigs shipped from those 17 farms. The mean values of ELISA OD% for each age groups serum samples that were collected in the second half of 2013 showed a positive correlation at 100 d (0.61, P<0.05), 130 d (0.45, P<0.1) with the isolation rate of Salmonella spp. in the slaughtered pigs. All the isolates were identified by a real-time PCR and tested for antimicrobial susceptibility. As a result, the predominant serovar was S. Typhimurium (52.8%) and there were 15 strains showing their own antimicrobial resistance pattern. All strains were susceptible to amoxicillin, cefepime, ciprofloxacin and some of them were resistant to streptomycin and tetracycline (60%), ampicillin (53.3%), chloramphenicol (33.3%), respectively.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.19 no.4
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• pp.119-128
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• 2019

Due to the nature of the 3D graphics processor system, many mathematical calculations are required and parallel processing research using GPU (Graphics Processing Unit) is being performed for high-speed processing. In this paper, we propose a 3D graphics processor using MAMS, a parallel processor that does not use cache memory, to solve the GPU problem of increasing bandwidth caused by cache memory miss and the problem that 3D shader processing speed is not constant. The 3D graphics processor using MAMS proposed in this paper designed Vertex shader, Pixel shader, Tiling and Rasterizing structure using DirectX command analysis, the FPGA(Xilinx Virtex6@100MHz) board for MAMS was constructed and designed using Verilog. We compared the processing time of the developed FPGA (100Mhz) and nVidia GeForce GTX 660 (980Mhz), the processing time using GTX 660 was not constant and suing MAMS was constant.

• Proceedings of the Korean Nuclear Society Conference
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• 2005.10a
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• pp.703-704
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• 2005