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Self-formed Schottky barrier induced selector-less RRAM for cross-point memory applications
Park, Sangsu,Jung, Seungjae,Siddik, Manzar,Jo, Minseok,Park, Jubong,Kim, Seonghyun,Lee, Wootae,Shin, Jungho,Lee, Daeseok,Choi, Godeuni,Woo, Jiyong,Cha, Euijun,Lee, Byoung Hun,Hwang, Hyunsang Wiley (John WileySons) 2012 Physica Status Solidi. Rapid Research Letters Vol.6 No.11
Investigation of State Stability of Low-Resistance State in Resistive Memory
Jubong Park,Minseok Jo,Bourim, El Mostafa,Jaesik Yoon,Dong-Jun Seong,Joonmyoung Lee,Wootae Lee,Hyunsang Hwang IEEE 2010 IEEE electron device letters Vol.31 No.5
<P>We investigated the state stability of the low-resistance state (LRS) in a resistive switching memory having a Pt/Cu:MoO<I>x</I>/GdO<I>x</I>/Pt structure. Various resistance values of LRS were accurately controlled using an external load resistor connected in series with the resistive memory device. We found that the retention time decreased with an increase in the resistance of LRS. We performed accelerating tests for resistance transition from a low- to a high-resistance state under temperatures ranging from 200°C to 250°C. A predicted resistance of LRS for a ten-year retention period at 85°C was determined based on the Arrhenius law.</P>
Improved Switching Variability and Stability by Activating a Single Conductive Filament
Jubong Park,Seungjae Jung,Wootae Lee,Seonghyun Kim,Jungho Shin,Daeseok Lee,Jiyong Woo,Hyunsang Hwang IEEE 2012 IEEE electron device letters Vol.33 No.5
<P>We successfully fabricated a single-filament-activated resistive memory having limited conductive filament (CF) source through a novel fabrication technique. The formation of a single filament was confirmed using conductive atomic force microscopy. Compared to conventional programmable metallization cell devices having an unlimited CF source, our single-filament device showed a significantly improved switching variability by minimizing the probability of randomly formed CFs. The elimination of unlimited CF sources changed the rate-limiting parameter that determines the retention and disturbance properties and improved thermal and electrical stability.</P>
Memristive switching behavior in Pr0.7Ca0.3MnO3 by incorporating an oxygen-deficient layer
Park, Sangsu,Jung, Seungjae,Siddik, Manzar,Jo, Minseok,Lee, Joonmyoung,Park, Jubong,Lee, Wootae,Kim, Seonghyun,Sadaf, Sharif Md.,Liu, Xinjun,Hwang, Hyunsang Wiley (John WileySons) 2011 Physica status solidi. PSS-RRL. Rapid Research Let Vol.5 No.10
Sangsu Park,Jungho Shin,Cimino, S.,Seungjae Jung,Joonmyoung Lee,Seonghyun Kim,Jubong Park,Wootae Lee,Myungwoo Son,Byunghun Lee,Pantisano, L.,Hyunsang Hwang IEEE 2011 IEEE electron device letters Vol.32 No.12
<P>We proposed a Mo/SiO<SUB>x</SUB>/Pt resistive random access memory (RRAM) device as an alternative to static random access memory (SRAM) devices for field-programmable gate array (FPGA) applications. In order to evaluate the feasibility of our RRAM device for FPGA applications, we utilized an RRAM device + inverter structure and confirmed its successful operation under various operational schemes, multilevel operation by controlling bias condition, and immunity against read disturbance and a retention test at high temperature. From the nonvolatile and reliable characteristics of our RRAM device, unlike that of SRAM devices, it holds promise to enable reconfigurable logic applications with significantly reduced logic-gate density and power consumption.</P>
Performance of a segmented HPGe detector at KRISS
Han, Jubong,Lee, K.B.,Lee, Jong-Man,Lee, S.H.,Park, Tae Soon,Oh, J.S. Elsevier 2018 Applied radiation and isotopes Vol.134 No.-
<P><B>Abstract</B></P> <P>A 24 segmented HPGe coaxial detector was set up with a digitized data acquisition system (DAQ). The DAQ was composed of a digitizer (5 × 10<SUP>7</SUP>sampling/s), a Field-Programmable Gate Array (FPGA), and a real time operating system. The Full Width Half Maximum (FWHM), rise time, signal characteristics, and spectra of a <SUP>137</SUP>Cs source were evaluated. The data were processed using an in-house developed gamma-ray tracking system.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The 24 segmented HPGe coaxial detectors were set up in KRISS. </LI> <LI> The DAQ system consists of two digitizers, three FPGA, one real time OS. </LI> <LI> The offline program is based on the CERN-PAW software. </LI> <LI> The shaping program uses the deconvolution method of fast pulse shaping. </LI> <LI> The signal shape at the target points was checked by the coincidence system. </LI> </UL> </P>
박호일(Hoil Park),서주봉(Jubong Seo),홍성유(Sungyou Hong),강수영(Suyoung Kang),김장균(Janggyeun Kim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
A flow noise radiating from a compressor housing of a vehicle turbocharge was investigated. The noise was induced by a vortex around the intake area of the compressor wheels - a intake flow noise, realized to be largely affected by a combination of the shape of the compressor scroll and that of compressor wheels by tests. And, its frequency did not increase proportionally to the turbocharger speed, and was located around the range of 1.6㎑ and 1.8㎑ to the whole working area of the turbocharger. Some countermeasures were tried to reduce the noise - helmholtz resonators, the change of the diffuser, the smaller compressor scroll, and a groove around the intake area of the compressor wheels. The smaller compressor scroll could effectively reduced the noise, but was not adopted because of the deterioration of the compressor performance. For the noise reduction, the groove was chosen because it could sufficiently reduce the noise and maintain the performance.
박호일(Hoil Park),임상봉(Sangbong Eom),서주봉(Jubong Seo),이승현(Seunghyun Lee) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.4
Automotive turbochargers have become common in gasoline engines as well as diesel engines. They are excellent devices to effectively increase fuel efficiency and power of the engines, but they unfortunately cause several noise problems. The noises are classified into mechanical noises induced from movement of a rotating shaft and aerodynamic noises by air flow in turbochargers. The mechanical noises are whine and howling noises, and the aerodynamic noises are BPF (blade-passing frequency), pulsation, surge, some special frequency noises. These noises are bothering passengers because their levels are higher or their frequencies are clearly separated from engine or vehicle noises. The noise investigated in this paper is a BPF noise induced by compressor wheels, whose frequency is the multiplication of the number of compressor wheel blades and its rotational speed. The noise is strongly dependent upon the geometry of wheels and the number of blades. This study tried to apply a groove close to the inlet side of compressor wheels in order to reduce the BPF noise. The groove has successfully reduced the noise of narrow band frequency of a turbocharger. It shows that the groove could reduce the wide band frequency noise, the compressor BPF noise with a best shape of the groove.