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Complementary Resistive Switch-Based Smart Sensor Search Engine
Sang-Jin Lee,Sung-Jin Kim,Kyoungrok Cho,Sung-Mo Kang,Eshraghian, Kamran IEEE 2014 IEEE SENSORS JOURNAL Vol.14 No.5
<P>Sensory search engines in a variety of applications, including DNA sequencing, are beginning to influence the way new search nanoarchitectures are constructed. This paper presents a novel nanoarchitecture based on a complementary resistive switch (CRS) construct for smart sensor search engines. Detailed operational principles of CRS, CRS-based memory array, and image matching applications using the Hamming distance measure are presented along with backing simulation results. The proposed scheme draws upon the inherent windowing behavior of fabricated CRS and hence, the duty cycle thus leading to a power dissipation of 115 nW/b, which is a reduction in power consumption by almost 50% when compared with the more conventional architectures. The variation on the match line is 100 mV/Hamming distance, providing a stable reference source for comparison input and stored data.</P>
Elevated Temperature Operation of 4H-SiC Nanoribbon Field Effect Transistors
Kang, Min Seok,Yu, Susanna,Koo, Sang Mo American Scientific Publishers 2015 Journal of Nanoscience and Nanotechnology Vol.15 No.10
<P>We fabricated 4H-SiC nanoribbon field effect transistors (FETs) of various channel thickness (t(ch)) of 100 similar to 500 nm by a 'top-down' approach, using a lithography and plasma etching process. We studied the dependence of the device transfer characteristics on the channel geometry. This demonstrated that fabricated SiC nanoribbon FETs with a t(ch) of 100 nm show normally-on characteristics, and have a threshold voltage of -12 V, and a maximum transconductance value of 8.8 mS, which shows improved drain current degradation of the SiC nanoribbon FETs with t(ch) = 100 nm at elevated temperature. This can be attributed to the improved heat dissipation, enhanced channel mobility, and together with widening of effective channel thickness depletion induced.</P>
Effects of DC and AC stress on the VT shift of AlGaN/GaN MIS-HEMTs
Kang Soo Cheol,Jung Hyun-Wook,Chang Sung-Jae,Choi Ilgyu,Lee Sang Kyung,Kim Seung Mo,Lee Byoung Hun,Ahn Ho-Kyun,Lim Jong-Won 한국물리학회 2022 Current Applied Physics Vol.39 No.-
AlGaN/GaN MIS-HEMTs with adjusted VT were fabricated using a recess gate to investigate the effect on actual operation when the polarity of the gate voltage is opposite in the on- and off-state. The direction and time exponents of VT shift depend on the polarity of the gate bias stress. Electrons detrapping from the Al2O3/AlGaN interface trap site to AlGaN under negative gate bias stress has to overcome the energy barrier, resulting in a higher temperature dependence. In addition, the unaffected gm and SS show that the degradation occurred primarily at the Al2O3/AlGaN interface rather than channel or mobility degradation. For unipolar and bipolar AC stresses, the time exponent of the VT shift during stress time has two values, and a relatively low value during relaxation after bipolar AC stress. These results may be due to the further degradation by Vmin at the broader energy levels of the Al2O3/AlGaN interface.
Starch Properties of Chinese Yam, Dioscorea opposita Thunb
Sang-Kuk Kim,Jae-Hee Won,Sang-Mo Kang,In-Jung Lee 韓國作物學會 2009 Korean journal of crop science Vol.54 No.2
The starch properties of two chinese yams were evaluated in this study. Amylose content ranged 13.5% to 19.3%. The swelling power of starches varied 10.98% to 11.43%. Water binding capacity in chinese yam starches ranged 93.46% to 107.21%, high WBC was observed in Ma 1. The onset temperature (To) of two chinese yam starches ranged 62.9 to 75.0~circC , peak temperature (Tp) ranged 76.2 to 84.7~circC . The PHI(peak height index) was about 4-fold higher in Anwon cultivar than in Ma 1 cultivar. SEM revealed that starches has a presence of large oval or spherical to small irregular-shape granules. Starch granule size ranged 15.23 to 15.52 ~mum , showing a typical C-type X-ray pattern.
Antioxidant and QR Inductive Activities of Novel Functional Soybean ‘Agakong3’
Kang-Mo Ku,Min-Gun Kim,Mi-Jeong Hong,Yeon-Shin Jeong,Jeong-Sang Kim,In-Jung Lee,Dong-Hyun Shin,Young-Hyun Hwang,Young-Hwa Kang 한국식품과학회 2009 Food Science and Biotechnology Vol.18 No.3
In order to evaluate the bioactivity of ‘Agakong3’, which was newly bred, quinone reductase (QR) inductive activity and antioxidant activity were both assessed. The methanol extract of ‘Agakong3’ showed a significantly stronger QR inductive activity than other soybeans. The methanol extract of ‘Agakong3’ also showed a significantly stronger cytotoxicity on hepa1c1c7 than other soybeans. ‘Agakong3’ exhibited the most potent antioxidant activity in the Trolox equivalent antioxidant capacity (TEAC) assay whereas it showed significantly weak antioxidant in the DPPH assay. In total phenol and flavonoid contents, ‘Agakong3’ showed the highest contents regarding phenol and flavonoid compounds. Major isoflavones such as daidzein and genistein were quantitified by high performance liquid chromatography. ‘Agakong3’ also showed the highest total isoflavone contents. Results of correlation analysis showed that there were high correlation coefficients between the contents of isoflavone and TEAC and the contents of isoflavone and QR inductive activity, respectively. These results suggest that ‘Agakong3’ will be a promising and functional food material.