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Son, S.W.,Park, J.H.,Baek, J.M.,Kim, J.S.,Kim, D.K.,Shin, S.H.,Banerjee, S.K.,Lee, J.H.,Kim, T.W.,Kim, D.H. Pergamon Press ; Elsevier Science Ltd 2016 Solid-State Electronics Vol.123 No.-
In this paper, we have fabricated and characterized In<SUB>0.7</SUB>Ga<SUB>0.3</SUB>As quantum-well (QW) metal-oxide-semiconductor field-effect-transistors (MOSFETs). We have employed the gate dielectric of the Al<SUB>2</SUB>O<SUB>3</SUB>/HfO<SUB>2</SUB> (0.6/2nm) bi-layer stack by ALD. The fabricated device with L<SUB>g</SUB>=4μm exhibits a record maximum transconductance (g<SUB>m_max</SUB>) in excess of 520μS/μm at >1μm region, and reasonably good electrostatic integrity, such as SS=110mV/decade and DIBL=43mV/V. Also, we have investigated the gate length scaling behavior in terms of output, transconductance, and transfer characteristics. In particular, our devices feature very uniform values of the electrostatic integrity, such as SS=100-110mV/decade, V<SUB>T</SUB>=-0.25V to -0.2V and DIBL=40-50mV/V, as L<SUB>g</SUB> decreases from 10μm to 4μm. Furthermore, we have explored the impact of source resistance (R<SUB>S</SUB>) onto the device characteristics of the InGaAs QW MOSFETs. In doing so, we have modeled both measured extrinsic transconductance (g<SUB>m_ext</SUB>) and intrinsic transconductance (g<SUB>m_int</SUB>) as a function of L<SUB>g</SUB>.
Fe₂O₃가 dope된 Na-K Borosilicate 유리의 Mossbauer 효과와 전기적 특성
동철,박문제,백승도 동국대학교 자연과학연구소 1986 자연과학연구 논문집 Vol.6 No.-
FeO(3~9 mole%)가 dope된 15% Na₂O : 14%K₂O 19%B₂O₃: 52%SiO₂유리구조를 Mossbauer spectroscopy로 조사하였으며 Fe₂O₃함량에 따른 d.c 전기전도와 유전율을 조사하였다. 상온에서 측정한 Mossbauer spectra를 Lorentzian line shape식에 fitting하여 얻은 isomer shipt값으로소 유리내에서 Fe가 Fe? 이온으로 존재하며 tetrahedral 구조를 가짐을 알 수 있었다. 또한isomer shift와 quadrupole splitting값을 변화가 없는 것으로 보아 Fe₂O₃양에 따른 구조 변화가 거의 없음을 알 수 있었다. 또한 d.c 전기전도도는 25~250℃ 영역에서 Fe₂O₃가 증가함에 따라 감소하였으며 유전율 역시 감소하였는데 이는 Fe₂O₃가 유리내에서 glass former로 작용하여 alkali 이온의 구속에 기인한다. Mossbauer parameters fo 15Na₂O-14K₂O-19B₂O₃-52SiO₂ glasses containning x Fe₂O₃ (3?x?9) have been studied at roon temperature. The d.c. conductivities and permities fo the glasses were measured over a temperature range from 25℃ to 250℃. From the isomer shift values of mossbauer spectra, it is concluded that the Fe ion is trivalent and the cordination number of Fe ion is four. The d.c. conductivities and permitivities of the glasses decreased as the Fe₂O₃concertration increased. These rewults mean that the Fe₂O₃behaves like a glass-forming oxide.
Son, S.-W.,Shin, S.H.,Park, J.H.,Baek, J.-M.,Kim, D.-K.,Lee, J.-H.,Kim, T.-W.,Kim, D.-H. IET 2017 Electronics letters Vol.53 No.18
<P>Long-channel In0.7Ga0.3As/In0.52Al0.48As quantum-well (QW) metaloxide- semiconductor field-effect-transistors (MOSFETs) on InP substrate have been fabricated and characterised. The fabricated device with L-g = 4 mu m exhibits excellent maximum transconductance (g(m_ max)) in excess of 0.48 mS/mu m at V-DS = 0.95 V, together with reasonably good electrostatic integrity of drain-induced-barrier-lowering < 40 mV/V and subthreshold-swing < 100 mV/decade. Besides, the effective mobility (mu(n_eff)) of the same device has been extracted, revealing that the device in this work yields excellent mu(n_eff) = 6960 cm(2)/V-s at room temperature. To the knowledge of the authors, the value of mu(n_eff) in this work is the highest in any surface-channel InGaAs MOSFET technology.</P>
승압형 컨버터를 이용한 인버터 TIG 용접기 역률개선에 관한 연구
백동영,김재문,안정준,김연충,원충연,민명식 성균관대학교 1998 학술회의지원논문목록집 Vol.1998 No.-
Average current mode controlled power factor correction technique utilizing converters operating in continuous conduction mode is applied to welding machine to improve welding performance. Due to its simplicity. the boost converter with automatic control is potentially the least expensive active line harmonics reducing current. We implemented the inverter TIG welding machine with boost converter.
You, D.J.,Jin, X.,Kim, J.H.,Jin, S.A.,Lee, S.,Choi, K.H.,Baek, W.J.,Pak, C.,Kim, J.M. Pergamon Press ; Elsevier Science Ltd 2015 International journal of hydrogen energy Vol.40 No.36
A nano-composite of ordered mesoporous carbon (OMC) and silicon carbide (SiC) was investigated as a durable support for Pt nanoparticles, in order to improve the electrochemical activity and stability in oxygen reduction reaction (ORR). The OMC and OMC-SiC were synthesized via a nano-replication method, using ordered mesoporous silica as a template and 1,10-phenanthrolline as a carbon source at temperatures of 900 and 1350, respectively. Non-porous SiC material was obtained by heat treatment at 1600 <SUP>o</SUP>C. The OMC-SiC composite, containing 10.3 wt% of SiC, exhibited a high surface area (568 m<SUP>2</SUP>/g) and well-defined mesopores (2.7 nm). Highly dispersed Pt nanoparticles were supported on both the OMC and the OMC-SiC, using a polyol method. The ORR activity and the electrochemical surface area (ECSA) of Pt/OMC, Pt/OMC-SiC and commercial Pt/C catalysts were measured using a rotating disk electrode technique with the linear sweep method, and a potential-cycling test, respectively. The Pt/OMC-SiC composite showed the highest activity as well as the highest durability for ECSA and ORR, which may be attributed to the effect of the intimate hybridization of SiC with the OMC in nanoscale. These results indicate that the OMC-SiC composite is a very promising support material for electrochemical catalysts in fuel cells.
Fang, M.,Choi, S.D.,Baek, S.Y.,Jin, G.,Chang, Y.S. Pergamon Press ; Elsevier [distribution] 2012 Atmospheric environment Vol.49 No.-
Spatial distribution and seasonal variation of polychlorinated biphenyl (PCB) and polybrominated diphenyl ether (PBDE) bulk deposition were investigated at four sites at and around an iron and steel making plant in Pohang, South Korea from January 2008 to May 2009. The steel complex site showed the highest average deposition fluxes of 74.0, 2.1, and 41.6 ng m<SUP>-2</SUP> day<SUP>-1</SUP> for @?<SUB>tri-deca</SUB>PCBs (Tri-DecaCBs), @?<SUB>12</SUB>PCBs (dioxin-like PCBs), and @?<SUB>8</SUB>PBDEs (8 PBDE congeners), respectively, indicating the steel complex is an important source of PCBs and PBDEs. The PCB deposition was dominated by Tri-TetraCBs and BDE209 was the most abundant PBDE congener. No clear seasonal variation of PCB and PBDE deposition was observed except at the steel complex site. Precipitation appeared to play an important role in the deposition distribution of PCBs, especially when the lowly chlorinated homologues dominated. In addition, the contribution of DL PCBs (dioxin-like PCBs) to the total TEQ (toxicity equivalent quantity) showed a seasonal variation and should not be neglected in the vicinity of a steel complex.
FEM, BEM 해석을 이용한 청소기 모토의 소음/진동에 관한 연구
김동규,백종진,송재민,김민우,정동월,김형주 朝鮮大學校 機械技術硏究所 2006 機械技術硏究 Vol.9 No.1
The noise level of Vacuum Cleaner Motors is becoming more important to the manufacturer and the user of the product. Invariably, the motor is a significant contributor to the overall noise level. Especially a major portion of the noise radiated by the vibration of the motor cap. This paper presents an approach to relate the dynamic characteristics of the motor cap with the noise radiation properties and the methods of redesigning the motor cap to reduce the noise radiation. To relate the dynamic characteristics of the motor cap with the noise radiation properties, the vibration and radiated sound were measured with the running motor. Based on the results of these tests correlations between the motor cap vibration characteristics and the noise radiation properties are identified It was found that the vibration on the motor cap and the noise radiated from the Vacuum Cleaner Motors were strongly correlated in certain frequency bands.