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Field emission from carbon nanotube emitters fabricated by the metal intermediation layer
Jeong, Taewon,Heo, Jungna,Lee, Jeonghee,Park, Sanghyun,Jin, Yongwan,Kim, J. M.,Oh, Taesik,Park, Chongwyun,Yoo, Ji-Beom,Gong, Byoungyun,Lee, Naesung,Yu, SeGi American Institute of Physics 2006 JOURNAL OF APPLIED PHYSICS - Vol.100 No.6
건식 열산화로 성장시킨 SiO₂ 박막의 이차전자 방출 특성
정태원(Taewon Jeong),유세기(SeGi Yu),이정희(Jeonghee Lee),진성환(S.H. Jin),허정나(Jungna Heo),이휘건(Whikun Yi),전동렬(D. Jeon),김종민(J.M. Kim) 한국진공학회(ASCT) 2001 Applied Science and Convergence Technology Vol.10 No.1
열산화시킨 SiO₂ 박막의 두께와 입사 전류의 양에 따라 이차전자 방출 계수를 측정하였다. 930℃에서 열산화시킨 SiO₂ 박막 두께는 5.8㎚, 19㎚, 43㎚, 79㎚, 95㎚, 114㎚였으며 이들의 이차전자의 방출 특성이 박막 두께와 전류량에 따라 변화하는 것을 확인하였다. 박막 두께 43㎚ 이하의 얇은 박막에서는 대체적으로 universal curve의 형태를 따르지만 79㎚ 이상의 두꺼운 박막에서는 이차전자 방출곡선이 최고점이 2개인 형태로 변하며 그 값도 전반적으로 낮아진다. 또 입사시키는 일차전자 전류의 증가에 대해서도 이차전자 방출곡선이 전체적으로 낮아진다. 이 실험에서 측정된 최대 이차전자 방출 계수는 박막 두께 19㎚, 일차 전자 에너지 300eV, 일차 전류 0.97㎂일 때 3.35를 갖는다. 이차전자 방출계수가 최대인 입사에너지에서 전자의 시료내 침투깊이와 탈출깊이와의 관계식을 통하여 박막 두께를 이론적으로 계산하였으며, 실험값과 비교적 일치하는 것을 확인하였다. The secondary electron emission (SEE) yields for the thermally grown SiO₂ thin layers were measured by varying the thickness of the SiO₂ layer and the primary current. SiO₂ thin layers were thermally grown in a furnace at 930℃, whose thickness varied to be 5.8㎚, 19㎚, 43㎚, 79㎚, 95㎚, and 114㎚. When the SiO₂ layers were thinner than 43㎚, it was found that SEE curves followed the universal curve. However, for samples with a SiO₂ layer thicker than 79㎚, the SEE curves exhibited two maxima and the values of SEE yields were reduced. Additionally, as the current of primary electrons increased, the SEE yields were reduced. In this experiment, the maximum value of the SEE yield for SiO₂ layers was obtained to be 3.35 when the thickness of SiO₂ layer was 19㎚, with the primary electron energy 300 eV and the primary electron current 0.97 ㎂. The penetration and escape depth of an electron in the SiO₂ layers were calculated at the primary electron energy for the maximum value of the SEE yield and from these depths, it was calculated that the thickness of the SiO₂ layer.
A Study on High Performance Converter Topology for Hydrogen Gas Generation Electrolysis System
Taewon Kang(강태원),Yuran Go(고유란),Yongsug Suh(서용석),Junik Jeong(정준익),Dohawn Rho(노도환) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.7
This paper investigates a high performance converter topology for hydrogen gas generation electrolysis system. The proposed converter topology consists of full-bridge inverter, medium frequency transformer, and diode rectifier. Hydrogen gas generation electrolysis process considered in the paper is analyzed and characterized by its equivalent circuit. The electrolysis cell is modeled as effective resistance, capacitance, inductance, and internal emf voltage source. The proposed converter topology provides enhanced efficiency of hydrogen gas generation process under the operating condition of dc output voltage with high frequency ripple on it. The high performance operation of proposed converter is confirmed through the simulation with the electrolysis cell considered in the equivalent circuit model.
정태원 충남대학교 공업교육연구소 1994 論文集 Vol.17 No.1
This paper gives a relationship for estimating the value of the damping ratio ??. Damping ratio is a key factor of second-order system and input is a unit step function. Students have better understanding about damping ratio and its physical meaning.
개방형 플랫폼을 이용한 저비용, 고효율 BEMS 구축방안
이태원(Taewon Lee),황지현(Jihyun Hwang),정이랑(Erang Jeong) 대한설비공학회 2018 대한설비공학회 학술발표대회논문집 Vol.2018 No.11
The building service branch is still in the traditional industries centered on hardware and manufacturing. In addition, most of the equipment specialists are facing such difficulties as automation systems or energy management systems based on information and communication technology. In order for our engineers to play a key role in the development, construction and utilization of BEMS, it is urgent to develop low-cost, high-performance systems and core algorithms. Using the new open platform described in this study, all of experts who do not know information and communication technology can easily and quickly build and operate the management system, which can greatly reduce the initial investment cost and maintenance cost of the installation stage. It is expected that it will contribute to maintenance of comfortable indoor environment and energy saving by improving operational management efficiency.
Hanwool Jeong,Taewon Kim,Younghwi Yang,Taejoong Song,Gyuhong Kim,Hyo-sig Won,Seong-Ook Jung IEEE 2015 IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS PART 1 R Vol.62 No.4
<P>An offset-compensated cross-coupled PFET bit-line (BL) conditioning circuit (OC-CPBC) and a selective negative BL write-assist circuit (SNBL-WA) are proposed for high-density FinFET static RAM (SRAM). The word-line (WL) underdrive read-assist and the negative BL write-assist circuits should be used for the stable operation of high-density FinFET SRAM. However, the WL underdrive read-assist circuit degrades the performance, and the negative BL write-assist circuit consumes a large amount of energy. The OC-CPBC enhances BL development during the evaluation phase by applying cross-coupled PFETs whose offset is compensated by precharging each of the two BLs separately through diode-connected cross-coupled PFETs. The SNBL-WA performs a write assist only when a write failure is detected, and this selective write assist reduces the write energy consumption. The simulation results show that the performance and energy consumption are improved by 41% and 48%, respectively, by applying the OC-CPBC and SNBL-WA to SRAM, even with a decrease in area.</P>
Jin, Taewon,Kim, Oh Yoen,Shin, Min-Jeong,Choi, Eun Young,Lee, Sung Sook,Han, Ye Sun,Chung, Ji Hyung American Chemical Society 2014 Journal of agricultural and food chemistry Vol.62 No.43
<P>Adiponectin, an adipokine, has been described as showing physiological benefits against obesity-related malfunctions and vascular dysfunction. Several natural compounds that promote the expression and secretion of adipokines in adipocytes could be useful for treating metabolic disorders. This study investigated the effect of fisetin, a dietary flavonoid, on the regulation of adiponectin in adipocytes using 3T3-L1 preadipocytes. The expression and secretion of adiponectin increased in 3T3-L1 cells upon treatment with fisetin in a dose-dependent manner. Fisetin-induced adiponectin secretion was inhibited by peroxisome proliferator-activated receptor (PPAR) antagonists. It was also revealed that fisetin increased the activities of PPARs and silent mating type information regulation 2 homologue 1 (SIRT1) in a dose-dependent manner. Furthermore, the up-regulation of adiponectin and the activation of PPARs induced by fisetin were prevented by a SIRT1 inhibitor. Fisetin also promoted deacetylation of PPAR γ coactivator 1 (PGC-1) and its interaction with PPARs. SIRT knockdown by siRNA significantly decreased both adiponectin production and PPARs–PGC-1 interaction. These results provide evidence that fisetin promotes the gene expression of adiponectin through the activation of SIRT1 and PPARs in adipocytes.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jafcau/2014/jafcau.2014.62.issue-43/jf502849j/production/images/medium/jf-2014-02849j_0007.gif'></P>