http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Market-Based Task Assignment for Cooperative Timing Missions in Dynamic Environments
Oh, G.,Kim, Y.,Ahn, J.,Choi, H. L. Springer Science + Business Media 2017 JOURNAL OF INTELLIGENT AND ROBOTIC SYSTEMS Vol.87 No.1
<P>New market-based decentralized algorithms are proposed for the task assignment of multiple unmanned aerial vehicles in dynamic environments with a limited communication range. In particular, a cooperative timing mission that cannot be performed by a single vehicle is considered. The baseline algorithms for a connected network are extended to deal with time-varying network topology including isolated subnetworks due to a limited communication range. The mathematical convergence and scalability analyses show that the proposed algorithms have a polynomial time complexity, and numerical simulation results support the scalability of the proposed algorithm in terms of the runtime and communication burden. The performance of the proposed algorithms is demonstrated via Monte Carlo simulations for the scenario of the suppression of enemy air defenses.</P>
Oh, G.,Lee, K.S.,Kim, E.K. Elsevier 2015 CURRENT APPLIED PHYSICS Vol.15 No.7
We have studied the electrical and optical properties of Si-doped indium tin oxides (ITSOs) as transparent electrodes and anti-reflection coatings for Si-based solar cells. The ITSO thin films were obtained by co-sputtering of ITO and SiO<SUB>2</SUB> targets under target power control. The resistivity of the ITSO thin films deposited at 0.625 in terms of power ratio (ITO/SiO<SUB>2</SUB>) were 391 Ωcm. In this condition, the ITSO thin films showed very high resistivity compared to sputted pure ITO thin films (1.08 x 10<SUP>-3</SUP> Ωcm). However, refractive index of ITSO thin films deposited at the same condition at 500 nm is somewhat lowered to 1.97 compared to ITO thin films (2.06). The fabricated graded refractive index AR coatings using ITO, ITSO, and SiO<SUB>2</SUB> thin films kept over 80% of transmittance regardless of their thickness varing from 97 nm to 1196 nm because of their low extinction coefficient. As the AR coating with graded refractive indices using ITO, ITSO, and SiO<SUB>2</SUB> layers was applied to general silicon-based solar cell, the current level increased nearly twice more than that of bare silicon solar cell without AR coating.
Multifractals of investor behavior in stock market
한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol. No.
<P>In this paper, we analyze the nonlinear properties of investor activity using the multifractal detrended fluctuation analysis (MF-DFA) method. Using the aggregated trading volumes of buying, selling, and normalized net investor trading (NIT) to quantify the characteristics of trader behavior in the KOSPI market, we find that the cumulative distribution functions of all NIT time series, except for individual traders, follow a power-law distribution with an exponent in the range of 2.92 <= gamma <= 3.87. To observe the nonlinear features of investor activity, we also calculate the multifractal spectra for the buyer, seller, and NIT data sets and find that a multifractal structure exists in all of the data, regardless of the investor type studied.</P>
Grouping characteristics of industry sectors in financial markets
North-Holland 2014 PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIO Vol.395 No.-
We investigated the grouping coefficients of industrial sectors in the stock network based on stock data for the U.S. and Korean stock markets. These complex networks were modeled using the minimal spanning tree (MST) method. We propose a novel approach based on the shortest path length (SPL) between stocks to quantify the grouping characteristics of the industrial sectors. We find that the grouping coefficients for the industrial sector in the U.S. are larger than those of the Korean stock market. In particular, for the Korean stock market the conglomerates, comprised of a diverse of industrial companies, have a significant grouping coefficient.
The impact of platform update interval on platform diffusion in a cooperative mobile ecosystem
Oh, G.,Hong, Y. S. Springer Science + Business Media 2018 Journal of intelligent manufacturing Vol.29 No.3
<P>In a mobile ecosystem, the platform provider has a huge influence on other stakeholders. The platform provider, which is to say the provider of a smartphone operating system, aims to grow its ecosystem sustainably by attracting various stakeholders such as users and application developers. Periodic platform upgrading is one of the effective strategies for appealing to potential participants as well as existing stakeholders. However, the diffusion of an updated platform is ineffective in a cooperative mobile ecosystem where a manufacturer modifies a platform released as open-source software on its smartphones. Even if the platform provider releases an updated version, users are not able to install it on their smartphones unless the manufacturer of those phones provides a follow-up update for it. Therefore, the platform provider should consider the response of the manufacturer to a follow-up update when it makes its decision on the platform update interval. This paper models the effectiveness of platform diffusion with respect to the platform update interval in consideration of the manufacturer's decision mechanism. In the model, the manufacturer provides a follow-up update when the benefits of increasing repurchases exceed development costs. The application of the proposed model is illustrated with parameters derived from a current mobile ecosystem. Further, a sensitivity analysis is conducted to analyze the impact of those parameters on the effectiveness of updated-platform diffusion.</P>
Isolation and Characterization of a Ds-tagged liguleless Mutant in Rice (Oryza sativa. L)
Byung-Ohg Ahn,지상혜,Doh-Won Yun,Hyeon-So Ji,Yong-Hwan Park,Sung-Han Park,Gi-Hwan Lee,Seok-Cheol Suh,Myung-Chul Lee 한국작물학회 2008 Journal of crop science and biotechnology Vol.11 No.4
A liguleless mutant, which showed complete loss of lamina joint region at the junction between leaf blade and leaf sheath, was isolated from a Ds insertional mutants derived from the source cultivar, Dongjin. This mutant could not affect other developmental patterns like phyllotaxis. Southern blot analysis, using GUS as a probe, revealed that the liguleless mutant contained three Ds copies transposed in the rice genome. Among the four genomic sequences flanking the Ds, one was mapped in the intergenic region (31661640 - 31661759), and the other two predicted a protein kinase domain (12098980 - 12098667) as an original insertion site within a starter line used for massive production of Ds insertional mutant lines. Another predicted and inserted in first exon of liguleless 1 protein (OsLG1) that was mapped in coding region (LOC_Os04g56170) of chromosome 4. RT-PCR revealed that the OsLG1 gene was not expressed liguleless mutants. Structure analysis of OsLG1 protein revealed that it predicted transcription factor with a highly conserved SBP domain consisting of 79 amino acids that overlapped a nuclear localization signal (NLS). RT-PCR revealed that OsLG1 is mainly expressed in vegetative organs.