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Introduction of Mobile-based Interactive Identification Key
Suwon Chun,Sungho Choi,Won-Young Choi,Yang-Seop Bae 한국응용곤충학회 2016 한국응용곤충학회 학술대회논문집 Vol.2016 No.04
Species identification, the process of finding the taxon to which a specimen belongs, is a difficult and frustrating task for most biologists but is absolutely fundamental to most biological research. However, proper species identification requires extensive knowledge on the particular taxon, thus can be problematic and confusing for non-professionals. To increase the accuracy of identification, computer-based interactive identification key has been widely used. In order to improve the identification process and promote effective utilization of Korean species, Korean Indigenous Interactive Key System (KIIS) was developed. Moreover, image-based online identification system was developed to broaden the range of users from non-experts to professionals. As the use of mobile device became significant in people’s lives, we further developed mobile web-based identification system.
Optically Assisted Charge Pumping on Floating-Body FETs
Sungho Kim,Sung-Jin Choi,Yang-Kyu Choi IEEE 2010 IEEE electron device letters Vol.31 No.12
<P>An optical charge-pumping (CP) method is proposed to extract the interface trap density in floating-body (FB) field-effect transistors (FETs). Optically generated majority carriers are removed from the FB by applying a burst of charge-pumping pulses to the gate. The change of the drain current after each CP pulse is used to determine the interface trap density. The advantage of this method lies in the possibility to characterize FB FETs without the unnecessary generation of interface traps by measurement bias. In addition, it can be applied to various types of FB devices directly without structural modification.</P>
( Sungho Choi ),( Youjung Kang ) 한국회계학회 2022 회계저널 Vol.31 No.5
The digital revolution, represented by the Fourth Industrial Revolution, is rapidly changing the industrial environment. To respond to these changes, global IT companies strategically invest in startups with innovative ideas through corporate venture capital (CVC) to secure future competitiveness. Most previous studies related to CVC have been empirical studies targeting the Silicon Valley. However, CVC is gradually spreading globally, and the proportion of total CVCs in Asia is rising rapidly. In particular, the method of preparing for digital transformation (DT) differs by country, and the functions and roles of CVCs differ. This study analyzed the role of CVC and their financial and strategic benefits through the case of Kakao Ventures, a representative CVC in Korea. The study also analyzed the effect of CVC investments on the growth of venture companies. Therefore, as we discuss issues related to CVC activation in Korea, the current research can be used as a reference material for policymakers and related practitioners.
Resistive-Memory Embedded Unified RAM (R-URAM)
Sungho Kim,Sung-Jin Choi,Yang-Kyu Choi IEEE 2009 IEEE transactions on electron devices Vol.56 No.11
<P>A disturb-free unified RAM (URAM) is demonstrated. It consists of a nonvolatile memory (NVM) and a capacitorless dynamic random access memory (DRAM) in a single-cell transistor. The NVM function is achieved by the resistive switching of an Al<SUB>2</SUB>O<SUB>3</SUB> film, and the capacitorless DRAM operation is attained by hole accumulation in a floating body. A property of resistive switching-an abrupt change of the bistable resistance state at a specific voltage-permits a high level of immunity to disturbances between NVM and capacitorless DRAM (1T-DRAM) operations compared to the previously proposed URAM whose NVM characteristics originate from charge trapping in the oxide/nitride/oxide layer.</P>
Choi, Jung-Mi,Kim, Sung-Soo,Choi, Chan-Il,Cha, Hye Lim,Oh, Huy-Hyen,Ghil, Sungho,Lee, Young-Don,Birnbaumer, Lutz,Suh-Kim, Haeyoung National Academy of Sciences 2016 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.113 No.39
<P>In mammals, initial detection of olfactory stimuli is mediated by sensory neurons in the main olfactory epithelium (MOE) and the vomeronasal organ (VNO). The heterotrimeric GTP-binding protein G(o) is widely expressed in the MOE and VNO of mice. Early studies indicated that G(o) expression in VNO sensory neurons is critical for directing social and sexual behaviors in female mice [Oboti L, et al. (2014) BMC Biol 12:31]. However, the physiological functions of G(o) in the MOE have remained poorly defined. Here, we examined the role of G(o) in the MOE using mice lacking the a subunit of G(o). Development of the olfactory bulb (OB) was perturbed in mutant mice as a result of reduced neurogenesis and increased cell death. The balance between cell types of OB interneurons was altered in mutant mice, with an increase in the number of tyrosine hydroxylase-positive interneurons at the expense of calbindin-positive interneurons. Sexual behavior toward female mice and preference for female urine odors by olfactory sensory neurons in the MOE were abolished in mutant male mice. Our data suggest that G(o) signaling is essential for the structural and functional integrity of the MOE and for specification of OB interneurons, which in turn are required for the transmission of pheromone signals and the initiation of mating behavior with the opposite sex.</P>
Sungho Choi,Eui-Rim Jeong,Lee, Y.H. IEEE 2009 IEEE journal of selected topics in signal processi Vol.3 No.3
<P>We propose an efficient Wiener model for a power amplifier (PA) and develop a direct learning predistorter (PD) based on the model. The Wiener model is formed by a linear filter and a memoryless nonlinearity in which AM/AM and AM/PM characteristics are approximated as piecewise linear and piecewise constant functions, respectively. A two-step identification scheme, wherein the linear portion is estimated first and the nonlinear portion is then identified, is developed. The PD is modeled by a polynomial and its coefficients are directly updated using a recursive least squares (RLS) algorithm. To avoid implementing the inverse of the PA's linear portion, the cost function for the RLS algorithm is defined as the sum of differences between the output of the PA's linear portion and the inverse of the PA's nonlinear portion. The proposed direct learning scheme, which is referred to as the piecewise RLS (PWRLS) algorithm, is simpler to implement, yet exhibits comparable performance, as compared with existing direct learning schemes.</P>
Bio‐Inspired Complementary Photoconductor by Porphyrin‐Coated Silicon Nanowires
Choi, Sung‐,Jin,Lee, Young‐,Chul,Seol, Myeong‐,Lok,Ahn, Jae‐,Hyuk,Kim, Sungho,Moon, Dong‐,Il,Han, Jin‐,Woo,Mann, Stephen,Yang, Ji‐,Won,Choi, Yang‐,Kyu WILEY‐VCH Verlag 2011 Advanced Materials Vol.23 No.34
<P><B>A symbiotically bio‐inspired complementary photoconductor</B> is demonstrated using a well‐defined silicon nanowire (SiNW) and porphyrins. The observed direction of the conductance change by light illumination has opposite signs for n‐ and p‐type SiNWs. On the basis of this observation, it is concluded that complementary photoconductors can be used to form functional logic gates of optical input with remarkably low static power dissipation.</P>