Approximate controllability of neutral functional differential system with unbounded delay by Jong Yeoul Park, Sang Nam Kang

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Optimal problem of cost function for the linear neutral systems by Jong Yeoul Park, Yong Han Kang

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Existence and uniqueness theorem for a solution of fuzzy differential equations by Jong Yeoul Park, Hyo Keun Han

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Duality in the optimal control of hyperbolic equations with positive controls by Jong Yeoul Park, Mi Jin Lee

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Nonlinear variational evolution inequalities in Hilbert spaces by Jin-Mun Jeong, Doo-Hoan Jeong, Jong-Yeoul Park

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