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Seoul, South Korea

Seoul National University of Science and Technology is one of Korea's national universities. The university originated from a Vocational Supplementary School established in 1910 by Emperor Gojong’s Royal Decree. Later the school was re-organized as Gyeongseong Public Industrial School, Gyeonggi Technical College, Gyeonggi Open Industrial University, and Seoul National University of Technology before it was finally reborn as Seoul National University of Science and Technology in September 2010 with celebrate the 100th anniversary of its foundation. The institution is also known as 'SeoulTech'.Today SeoulTech is a large university housing six colleges, 32 departments, six graduate schools and a student enrolment of 14,000 people in a spacious campus of 500,000 square meters . This is the 3rd largest campus out of universities in Seoul. The campus, formerly occupied by the engineering departments of Seoul National University, is in Nowon-gu in the northern part of Seoul. Wikipedia.

Kim J.H.,Seoul National University of Science and Technology
Topics in current chemistry | Year: 2014

Protein-protein interaction occurs transiently or stably when two or more proteins bind together to mediate a wide range of cellular processes such as protein modification, signal transduction, protein trafficking, and structural folding. The macromolecules involved in protein biosynthesis such as aminoacyl-tRNA synthetase (ARS) have a number of protein-protein interactions. The mammalian multi-tRNA synthetase complex (MSC) consists of eight different enzymes: EPRS, IRS, LRS, QRS, MRS, KRS, RRS, and DRS, and three auxiliary proteins: AIMP1/p43, AIMP2/p38, and AIMP/p18. The distinct ARS proteins are also connected to diverse protein networks to carry out biological functions. In this chapter we first show the protein networks of the entire MSC and explain how MSC components interact with or can regulate other proteins. Finally, it is pointed out that the understanding of protein-protein interaction mechanism will provide insight to potential therapeutic application for diseases related to the MSC network.

Do H.-L.,Seoul National University of Science and Technology
IEEE Transactions on Power Electronics | Year: 2012

A soft-switching single-ended primary inductor converter (SEPIC) is presented in this paper. An auxiliary switch and a clamp capacitor are connected. A coupled inductor and an auxiliary inductor are utilized to obtain ripple-free input current and achieve zero-voltage-switching (ZVS) operation of the main and auxiliary switches. The voltage multiplier technique and active clamp technique are applied to the conventional SEPIC converter to increase the voltage gain, reduce the voltage stresses of the power switches and diode. Moreover, by utilizing the resonance between the resonant inductor and the capacitor in the voltage multiplier circuit, the zero-current-switching operation of the output diode is achieved and its reverse-recovery loss is significantly reduced. The proposed converter achieves high efficiency due to soft-switching commutations of the power semiconductor devices. The presented theoretical analysis is verified by a prototype of 100kHz and 80W converter. Also, the measured efficiency of the proposed converter has reached a value of 94.8 at the maximum output power. © 2006 IEEE.

Do H.-L.,Seoul National University of Science and Technology
IEEE Transactions on Circuits and Systems I: Regular Papers | Year: 2012

An improved zero-voltage-switching (ZVS) dc-dc converter with a high voltage gain and a ripple-free input current is proposed. It consists of two converter cellsa boost cell and an asymmetrical pulse-width-modulation (APWM) full-bridge cell. The boost cell in the proposed converter has the capabilities of providing a ripple-free input current. The APWM full-bridge cell provides a high voltage gain. The output diodes are under zero-current-switching (ZCS) during turn-off. The proposed converter has high efficiency due to soft-switching operation in full-bridge switches. Steady-state analysis of the converter is presented to determine the circuit parameters. A laboratory prototype of the proposed converter is developed, and its experimental results are presented for validation. © 2004-2012 IEEE.

Ahn C.K.,Seoul National University of Science and Technology
Computers and Mathematics with Applications | Year: 2012

In this paper, we propose some new results on stability for Takagi-Sugeno fuzzy delayed neural networks with a stable learning method. Based on the Lyapunov-Krasovskii approach, for the first time, a new learning method is presented to not only guarantee the exponential stability of Takagi-Sugeno fuzzy neural networks with time-delay, but also reduce the effect of external disturbance to a prescribed attenuation level. The proposed learning method can be obtained by solving a convex optimization problem which is represented in terms of a set of linear matrix inequalities (LMIs). An illustrative example is given to demonstrate the effectiveness of the proposed learning method. © 2011 Elsevier Ltd. All rights reserved.

Ahn C.K.,Seoul National University of Science and Technology
Fuzzy Sets and Systems | Year: 2011

In this paper, we propose some new results on stability properties of Takagi-Sugeno fuzzy Hopfield neural networks with time-delay. Based on Lyapunov stability theory, a new learning law is derived to guarantee passivity and asymptotical stability of Takagi-Sugeno fuzzy Hopfield neural networks. Furthermore, a new condition for input-to-state stability (ISS) is established. Illustrative examples are given to demonstrate the effectiveness of the proposed results. © 2011 Elsevier B.V. All rights reserved.

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