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Nambin Kim,Woong Jung,Donghoon Shin,Hongwoo Seo,Hyungsang Kim,Hyunsik Im,Kyooho Jung,Soonkoo Kim,Sungchan Kim,Yongmin Kim 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.3
We investigated the (ballistic) current-voltage (I-V ) characteristics in a 100-nm ..-gate AlGaAs/InGaAs Pseudomorphic high-electron-mobility transistor (pHEMT) as a function of temperature for temperatures ranging from 300 K to 10 K and analyzed the transport in terms of carrier backscattering. We observed that the drain current in the linear region dramatically increased below 60 K due to reduced phonon scattering. The critical temperature where the drain current started to rapidly increase shifted to a higher value as the drain voltage was increased. These results are in good agreement with the ballistic transport theory in which low temperatures and high electric fields along the channel lead to enhanced ballistic transport due to a reduction in the backscattering probability. We also carried out self-consistent Schrodinger-Poisson band profile calculations to understand the experimental data.
Characteristics of Ballistic Tansport in Short-Channel MOSFETs
Nambin KIM,Hyungsang KIM,Hyunjung KIM,임현식,Sangsu PARK,Yongmin KIM 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.3
The Si MOSFET is the single most important unit of any digital or analog circuit today. As it is scaled down to the nanometer region, charge carriers (electrons and holes) in the channel are expected to ow with fewer scattering events, leading to ballistic transport. In this work, the characteristics of the quasi-ballistic MOSFET are systematically investigated by taking into account scattering phenomena of the carriers. For a practical viewpoint, a conventional MOSFET structure is exploited. Numerical calculations of potential prole are carried out, in order to understand and quantify the transport as functions of gate and drain voltages under various conditions.
Temperature Dependence of Resistance Switching in Cr Doped SrZrO3 Thin Films
Mooyoung Kim,Hyungsang Kim,Hongwoo Seo,임현식,Jeon-Kook Lee,Kyooho Jung,Yongmin Kim,이전국 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.3
The temperature dependence of resistive switching of Cr 0.2at%-doped SrZrO3 (Cr:SZO) thin films grown on SrRuO3/Si(100) substrates by using radio frequency sputtering has been studied over the temperature range between 300 K and 10 K. The film has a polycrystalline structure. Good and reproducible ON and OFF resistive switching is observed. While the low-resistance ON state show a metallic behavior, the high-resistance OFF current shows a thermal activation behavior. Using an Arrhenius plot, we estimated the barrier height of the initial (before forming) and the OFF states to be 24.2 meV and 2.14 meV, respectively.
Tailoring resistive switching characteristics in WOx films using different metal electrodes
Jo, Yongcheol,Kim, Jongmin,Woo, Hyeonseok,Kim, Duwhan,Lee, James W.,Inamdar, Akbar I.,Im, Hyunsik,Kim, Hyungsang Elsevier 2014 Current Applied Physics Vol.14 No.1
We have investigated the role of the metal/oxide junction interface on the resistive switching (RS) characteristics in WO3+x films. The WOx films are fabricated on Pt substrates by magnetron sputtering at room temperature. Top metal contact (Au or Al) is fabricated by using thermal evaporator. The thicknesses of WOx films and top electrodes are 1 mu m and 200 nm, respectively. It has been found that the bi-polar RS direction is dependent on the choice of top metal electrode, Au or Al. The sample with a Au top electrode shows clockwise (CW) RS mode whilst the sample with a Al top electrode shows counter-clockwise (CCW) RS mode. The on/off ratio is 10 times for Au/WOx/Pt and 100 times for Al/WOx/Pt. The bi-polar RS modes are modeled in terms of the difference in the electronegativity of the top and bottom electrodes. (C) 2013 Elsevier B.V. All rights reserved.
마그네슘 다이캐스팅 공법 적용 경량 카울크로스멤버 부품개발
김두연(Dooyeon Kim),김수상(Soosang Kim),박형상(Hyungsang Park),이우식(Woosik Lee),오제하(Jeha Oh),황종원(Jongwon Hwang) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The Element who is a environmental contamination and an automobile fuel efficiency improvement the automobile lightweight is to in the process of advancing. The magnesium alloy from in the utility metal with the lightest metal in the lithosphere element is abundant at 6th and has the vibration which is excellent and a shocking absorbability and the subject matter quality of electromagnetic waves screening characteristic etc. The overseas’s various magnesium cross members are executed a benchmarking evaluation in the object. Set the goal, physical properties and a parts lightweight of above on equal level with aim, Applied AM60B magnesium alloy, at the first among nation the lightweight magnesium cowl cross member with die casting method developed. Crash test results were excellent. Development result, Accomplished a lightweight 30% and reduced parts.
차세대 알루미늄 피스톤의 신뢰성 검증을 위한 내구특성 평가
조일환(Ilhwan Jo),이형상(Hyungsang Lee),김희붕(Heuiboong Kim),장현모(Hyunmo Jang),김동연(Dongyeon Kim),김숭기(Soongkee Kim) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Each automobile company has their own process to validate durability characteristic of their own product. As customer has been focusing initial quality of vehicle, automobile companies try to improve their validation process and work up to enhance initial quality and durability. In case of engine development, engine must be validated its durability characteristic at max load and max power condition, speed transient condition, hot & cold condition and each engine's specific running condition. In this study, after increasing combustion pressure up to 180 bar, initial durability validation cycle which is consisted of high load & high power condition, city cycle condition and vehicle simulation cycle condition was applied for verifying next generation aluminum piston durability characteristic.