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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 Energy-Efficient Geographical Routing for IEEE 802.15.4a Networks
KIM, Junseok,KWON, Younggoo The Institute of Electronics, Information and Comm 2010 IEICE TRANSACTIONS ON COMMUNICATIONS - Vol.93 No.4
<P>The IEEE 802.15.4a standard enables geographical routing in ZigBee networks but previous geographical routing algorithms can suffer high packet loss due to the interference effects. This letter proposes an interference-aware energy-efficient geographical routing algorithm for the IEEE 802.15.4a networks. The proposed algorithm estimates the energy cost by considering the interference effects and forwards a packet to the neighbor with the lowest energy cost to advance. Experimental results show that the proposed algorithm outperforms the previous algorithms in terms of the delivery ratio and the energy consumption.</P>
AN UNCONDITIONALLY GRADIENT STABLE NUMERICAL METHOD FOR THE OHTA-KAWASAKI MODEL
Kim, Junseok,Shin, Jaemin Korean Mathematical Society 2017 대한수학회보 Vol.54 No.1
We present a finite difference method for solving the Ohta-Kawasaki model, representing a model of mesoscopic phase separation for the block copolymer. The numerical methods for solving the Ohta-Kawasaki model need to inherit the mass conservation and energy dissipation properties. We prove these characteristic properties and solvability and unconditionally gradient stability of the scheme by using Hessian matrices of a discrete functional. We present numerical results that validate the mass conservation, and energy dissipation, and unconditional stability of the method.