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AN OPTIMAL BOOSTING ALGORITHM BASED ON NONLINEAR CONJUGATE GRADIENT METHOD
JOOYEON CHOI,BORA JEONG,박예솜,JIWON SEO,민조홍 한국산업응용수학회 2018 Journal of the Korean Society for Industrial and A Vol.22 No.1
Boosting, one of the most successful algorithms for supervised learning, searches the most accurate weighted sum of weak classifiers. The search corresponds to a convex programming with non-negativity and affine constraint. In this article, we propose a novel Conjugate Gradient algorithm with the Modified Polak-Ribiera-Polyak conjugate direction. The convergence of the algorithm is proved and we report its successful applications to boosting.
Polarimetric Observation of (3200) Phaethon, in Preparation for the Upcoming DESTINY+ Space Mission
Jooyeon Geem,Masateru Ishiguro,Jun Takahashi,Hiroshi Akitaya,Koji S. Kawabata,Tatsuya Nakaoka,Ryo Imazawa,Fumiki Mori,Daisuke Kuroda,Sunao Hasegawa,Fumi Yoshida,Ko Ishibashi,Tomoko Arai,Tomohiko Sekig 한국천문학회 2022 天文學會報 Vol.47 No.1
Jooyeon Hong,이제욱,함시현 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.2
The structural and energetic preferences of thiacalix[4]biscrown-5 with and without alkali metal ions (Na+, K+, Rb+and Cs+) have been theoretically investigated for the first time using molecular dynamic (MD) simulations and density functional theory (MPWB1K/6-31G(d)//B3LYP/6-31G(d)) methods. The formation of the metal ion complex by the host is mainly driven by the electrostatic attraction between crown-5 oxygens and a cation together with the minor contribution of the cation-π interaction between two facing phenyl rings around the cation. The computed binding energies and the atomic charge distribution analysis for the metal binding complexes indicate the selectivity toward a potassium ion. The theoretical results herein explain the experimentally observed extractability order by this host towards various alkali metal ions. The physical nature and the driving forces for cation recognition by this host are discussed in detail.