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PATH AVERAGED OPTION VALUE CRITERIA FOR SELECTING BETTER OPTIONS
JUNSEOK KIM,MINHYUN YOO,HYEJU SON,SEUNGGYU LEE,MYEONG-HYEON KIM,YONGHO CHOI,DARAE JEONG,YOUNG ROCK KIM 한국산업응용수학회 2016 Journal of the Korean Society for Industrial and A Vol.20 No.2
In this paper, we propose an optimal choice scheme to determine the best option among comparable options whose current expectations are all the same under the condition that an investor has a confidence in the future value realization of underlying assets. For this purpose, we use a path-averaged option as our base instrument in which we calculate the time discounted value along the path and divide it by the number of time steps for a given expected path. First, we consider three European call options such as vanilla, cash-or-nothing, and asset-or-nothing as our comparable set of choice schemes. Next, we perform the experiments using historical data to prove the usefulness of our proposed scheme. The test suggests that the path-averaged option value is a good guideline to choose an optimal option.
van der Waals gap-inserted light-emitting p–n heterojunction of ZnO nanorods/graphene/p-GaN film
Sung Ho Moon,Junseok Jeong,Gwan Woo Kim,Dae Kwon Jin,Yong-Jin Kim,Jong Kyu Kim,Keun Soo Kim,Gunn Kim,Young Joon Hong 한국물리학회 2020 Current Applied Physics Vol.20 No.2
We report on the electroluminescent (EL) and electrical characteristics of graphene-inserted ZnO nanorods (NRs)/p-GaN heterojunction diode. In a comparative study, ZnO NRs/p-GaN and ZnO NRs/graphene/p-GaN heterojunctions exhibit white and yellow EL emissions, respectively, at reverse bias (rb) voltages. The different EL colors are results of different dichromatic EL peak intensity ratios between 2.25 and 2.8 eV light emissions which are originated from ZnO and p-GaN sides, respectively. The 2.25 eV EL is predominant in both the heterojunctions, because of recombination by numerous electrons tunneled from p-GaN to ZnO across the thin barriers of the staggered broken gap with a large band offset in ZnO/p-GaN and the van der Waals (vdW) gap formed by graphene insertion at ZnO NRs/p-GaN. However, as for the 2.8 eV EL intensity, ZnO NRs/graphene/p- GaN hardly shows the EL emission, whereas ZnO NRs/p-GaN exhibits the substantially strong EL peak. We discuss that the significantly reduced 2.8 eV EL emission of ZnO NRs/graphene/p-GaN is a result of decreased depletion layer thickness at p-GaN side where the recombination events occur for 2.8 eV EL before the reverse bias-driven tunneling because the insertion of graphene (or vdW gap barrier) inhibits the carrier diffusion whose amount determines the depletion thickness when forming the heterojunctions. This study opens a way of suppressing (or enhancing) the specific EL wavelength for the dichromatic EL-emitting heterojunctions simply by inserting atom-thick vdW layer.
Hyeon Ju JEONG,Eun-Jung KIM,Jung Yun KIM,Seok Won HAM,Sang-Hun CHOI,Nayoung HONG,Min Gi PARK,Junseok JANG,Sunyoung SEO,Sung-Ok KIM,Sung-Chan KIM,Hyunggee KIM 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
The Jagged-1 (JAG1) is a Notch ligand that contact-dependently activates Notch receptors and regulates cancer progression. When Notch receptor activate, NOTCH intracellular domain (NICD) is released through proteolytic cleavage and forms transcription complex. Here, we show that JAG1 also releases JAG1 intracellular domain (JICD1) and JICD1 forms a transcription complex with DEAD-Box Helicase 17, SMAD Family Member 3, and TGFB induced factor homeobox 2. The JICD1 transcription complex binds to the promoter of Sex determining region Y-box 2 (SOX2) and regulates transcription of SOX2. JICD1 promotes acquisition of glioblastoma (GBM) stem cell properties by JICD1 transcription complex mediated SOX2 expression. JAG1 is highly expressed in GBM and induce reverse signal via JICD1 transcription complex. By regulating transcription of SOX2, JICD1 transcription complex is an important player in the maintenance of GBM properties. The inhibition of JICD1 transcription complex may be a novel strategy to target Notch signal.
Interference-aware topology control for low rate wireless personal area networks
Junseok Kim,Younggoo Kwon IEEE 2009 IEEE TRANSACTIONS ON CONSUMER ELECTRONICS - Vol.55 No.1
<P>The topology control technique can prolong the network lifetime, but it can suffer the significant performance degradation due to the interferences of WLAN or Bluetooth devices. This paper proposes a novel topology control algorithm to reduce the interference effects. The basic idea of the proposed algorithm is to estimate the interference effects exactly and re-construct the robust network topology to the interference variations. From the experimental results, we can see that the proposed algorithm shows the good performance results in terms of the delivery ratio and the energy consumptions.</P>
A HYBRID METHOD FOR HIGHER-ORDER NONLINEAR DIFFUSION EQUATIONS
KIM JUNSEOK,SUR JEANMAN Korean Mathematical Society 2005 대한수학회논문집 Vol.20 No.1
We present results of fully nonlinear time-dependent simulations of a thin liquid film flowing up an inclined plane. Equations of the type $h_t+f_y(h) = -{\in}^3{\nabla}{\cdot}(M(h){\nabla}{\triangle}h)$ arise in the context of thin liquid films driven by a thermal gradient with a counteracting gravitational force, where h = h(x, t) is the fluid film height. A hybrid scheme is constructed for the solution of two-dimensional higher-order nonlinear diffusion equations. Problems in the fluid dynamics of thin films are solved to demonstrate the accuracy and effectiveness of the hybrid scheme.
Basic Principles and Practical Applications of the Cahn–Hilliard Equation
Kim, Junseok,Lee, Seunggyu,Choi, Yongho,Lee, Seok-Min,Jeong, Darae Hindawi Limited 2016 Mathematical problems in engineering Vol.2016 No.-
<P>The celebrated Cahn–Hilliard (CH) equation was proposed to model the process of phase separation in binary alloys by Cahn and Hilliard. Since then the equation has been extended to a variety of chemical, physical, biological, and other engineering fields such as spinodal decomposition, diblock copolymer, image inpainting, multiphase fluid flows, microstructures with elastic inhomogeneity, tumor growth simulation, and topology optimization. Therefore, it is important to understand the basic mechanism of the CH equation in each modeling type. In this paper, we review the applications of the CH equation and describe the basic mechanism of each modeling type with helpful references and computational simulation results.</P>