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Ryu, Seung Wook,Lyeo, Ho-Ki,Lee, Jong Ho,Ahn, Young Bae,Kim, Gun Hwan,Kim, Choon Hwan,Kim, Soo Gil,Lee, Se-Ho,Kim, Ka Young,Kim, Jong Hyeop,Kim, Won,Hwang, Cheol Seong,Kim, Hyeong Joon IOP Pub 2011 Nanotechnology Vol.22 No.25
<P>This study examined the various physical, structural and electrical properties of SiO<SUB>2</SUB> doped Ge<SUB>2</SUB>Sb<SUB>2</SUB>Te<SUB>5</SUB> (SGST) films for phase change random access memory applications. Interestingly, SGST had a layered structure (LS) resulting from the inhomogeneous distribution of SiO<SUB>2</SUB> after annealing. The physical parameters able to affect the reset current of phase change memory (<I>I</I><SUB>res</SUB>) were predicted from the Joule heating and heat conservation equations. When SiO<SUB>2</SUB> was doped into GST, thermal conductivity largely decreased by ∼ 55%. The influence of SiO<SUB>2</SUB>-doping on <I>I</I><SUB>res</SUB> was examined using the test phase change memory cell. <I>I</I><SUB>res</SUB> was reduced by ∼ 45%. An electro-thermal simulation showed that the reduced thermal conductivity contributes to the improvement of cell efficiency as well as the reduction of <I>I</I><SUB>res</SUB>, while the increased dynamic resistance contributes only to the latter. The formation and presence of the LS thermal conductivity in the set state test cell after repeated switching was confirmed. </P>
Kim, Gil-Sung,Kim, Jae Hoon,Oh, Se-Yun,Kim, Hyeong Jun,Lee, Sang-Kwon,Lee, Choong Hun American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.11
<P>We report the fabrication and characterization of 450 kg multicrystalline silicon (mc-Si) ingot through both controlled crystalline growth and minimization of the crystalline defects and impurities to enhance the power conversion efficiency (PCE) of mc-Si based solar cells. The concentrations of impurities were gradually increased from the center to the edge of mc-Si ingot caused by the incorporation of impurities from alumina crucible and internal furnace components. By further investigating the structural defects in mc-Si wafer, the solar cell performances of mc-Si wafers was found to be highly dependent on the minority carrier lifetime related to the crystal defects, grain orientation and boundaries. From the current density-voltage measurement of mc-Si based solar cells cut from block A, the obtained short current density (J(SC)), open circuit voltage (V-OC), and PCE (eta) were similar to 32.03 mA/cm(2), similar to 0.59 V, and similar to 14.65% under AM 1.5G illumination, respectively.</P>
AC Loss Effects on the Design of HTS Windings for 1 MVA Power Transformer
Kim, Jong-Tae,Kim, Woo-Seok,Kim, Sung-Hoon,Choi, Kyeong-Dal,Hong, Gye-Won,Joo, Hyeong-Gil,Hahn, Song-Yop The Korea Institute of Applied Superconductivity a 2004 한국초전도저온공학회논문지 Vol.6 No.4
AC loss is one of the important parameters in HTS (High Temperature Superconducting) AC devices. Among the HTS AC power devices, the transformer is an essential part in electrical power system. But, AC loss is one of the most serious problems of the HTS transformer, especially with pancake windings, because high alternating magnetic field is applied perpendicularly to the surface of BSCCO wire in HTS windings of that, comparing with the other HTS AC power devices. For the reason above the calculation of AC loss generated in the HTS windings should be carried out in advance when designing the HTS transformer. In the paper we performed study for optimization of winding design to minimize the magnetization loss of HTS winding such as the spaces between pancake windings and operating temperature of HTS wire. The calculation of the AC loss was accomplished by 2-demensional Finite Element Method.
Kim, Dong-Ha,Lim, Yun-Young,Kim, Hyeong-Mi,Kim, So-Young,Kim, Beom-Joon,Park, Sung-Gil,Lee, Tae-Hoon,Cho, Soo-Muk Korean Society of ToxicologyKorea Environmental Mu 2012 Toxicological Research Vol.28 No.1
A novel synthetic hexapeptide (SFKLRY-$NH_2$) that displays angiogenic activity has been identified by positional scanning of a synthetic peptide combinatorial library (PS-SPCL). This study was carried out to investigate the irritation of the SFKLRY-$NH_2$ on the skin. The tests were performed on the basis of Korea Food and Drug Administration (KFDA) guidelines. In results, cell toxicity is not appeared for SFKLRY-$NH_2$ in HaCaT cells and B16F10 cells. SFKLRY-$NH_2$ induced no skin irritation at low concentration ($10{\mu}m$), mild irritation at high concentration (10mM). We consider that this result is helpful for saying about the safety of SFKLRY-$NH_2$ in clinical use.
Analog Front-end for EMG Acquisition System
Hyeong-Kyu Kim,Bum-Sik Chung,Kang-Il Cho,Ho-Jin Kim,Gil-Cho Ahn 대한전자공학회 2018 Journal of semiconductor technology and science Vol.18 No.6
This paper presents a four-channel analog front-end (AFE) for electromyogram (EMG) acquisition systems. Each input channel consists of a chopper-stabilized instrumentation amplifier (IA) and a low-pass filter (LPF). A 16-bit analog-to-digital converter (ADC) is shared between four-input channels through a 4-to-1 multiplexer and a buffer amplifier. To achieve a 16-bit resolution, a secondorder feed-forward incremental ADC (IADC) with a 1.5-bit quantizer is employed. The prototype AFE is fabricated in a 0.18 μm CMOS process with an active die area of 1.4 mm². It achieves a 1.12 μVRMS input referred noise with an input channel gain of 44 Db and an LPF cutoff frequency of 500 Hz, while consuming 615 μW/channel from a 1.8 V supply.
Optimization of transformer winding considering AC loss of BSCCO wire
Kim, Jong-Tae,Kim, Woo-Seok,Kim, Sung-Hoon,Choi, Kyeong-Dal,Hong, Gye-Won,Joo, Hyeong-Gil,Hahn, Song-yop IEEE 2005 IEEE transactions on applied superconductivity Vol.15 No.2
AC loss is one of the important parameters in HTS (High Temperature Superconducting) AC devices. Among the HTS AC power devices, the transformer is an essential part in electrical power system. But, AC loss is one of the most serious problems of the HTS transformer, especially with pancake windings, because high alternating magnetic field is applied perpendicularly to the surface of BSCCO wire in HTS windings of that, comparing with the other HTS AC power devices. For the reason above the calculation of AC loss generated in the HTS windings should be carried out in advance when designing the HTS transformer. In the paper we performed study for optimization of winding design to minimize the magnetization loss of HTS winding such as the spaces between pancake windings and operating temperature of HTS wire. The calculation of the AC loss was accomplished by 2-dimensional Finite Element Method.