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.
Electronics, Telecommunications Research Institute, Seoul National University of Science and Technology | Date: 2014-04-15
A tag transmitting apparatus of a passive RFID (radio frequency identification) system generates a pilot tone, a preamble, and an SFD (start frame delimiter) and transmits the pilot, the preamble, and the SFD, using one of a plurality of square waves.
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.
Kim K.-H.,Seoul National University of Science and Technology
IEEE Transactions on Industrial Electronics | Year: 2011
To detect a stator winding fault caused by a short-circuited turn in a permanent magnet synchronous motor, a simple online fault detecting scheme is presented. The proposed scheme is based on the monitoring of the second-order harmonic components in the q-axis current through harmonic analysis. To verify the effectiveness of the proposed scheme, a test motor which allows an interturn short in the stator winding has been built, and the entire control system has been implemented using the DSP TMS320F28335. © 2010 IEEE.
Lee J.-S.,Seoul National University of Science and Technology
G3 (Bethesda, Md.) | Year: 2014
We report a method for generating Drosophila germline mutants effectively via injection of the complex of the purified Cas9 protein, tracrRNA, and gene-specific crRNAs, which may reduce delayed mutations because of the transient activity of the Cas9 protein, combined with the simple mutation detection in GO founders by the T7E1 assay. Copyright © 2014 Lee et al.
Do H.-L.,Seoul National University of Science and Technology
IEEE Transactions on Power Electronics | Year: 2011
A new nonisolated bidirectional zero-voltage-switching (ZVS) dc-dc converter is proposed. The proposed converter can operate with ZVS, fixed switching frequency, and a ripple-free inductor current regardless of the direction of power flow. To provide ZVS of the power switches and a ripple-free inductor current, the proposed converter utilizes a very simple auxiliary circuit that consists of an additional winding to the main inductor and an auxiliary inductor. Due to ZVS operation, the reverse recovery problem of the antiparallel body diode of the power switch does not occur. Moreover, the ripple-free inductor current can reduce the voltage ripple. Theoretical analysis of the proposed bidirectional dc-dc converter and the experimental results obtained on 100-W prototype are discussed. © 2011 IEEE.
Ahn C.K.,Seoul National University of Science and Technology
Nonlinear Dynamics | Year: 2012
In this paper, a new exponential state estimation method is proposed for switched Hopfield neural networks based on passivity theory. Through available output measurements, the main purpose is to estimate the neuron states such that the estimation error system is exponentially stable and passive from the control input to the output error. Based on augmented Lyapunov-Krasovskii functional, Jensen's inequality, and linear matrix inequality (LMI), a new delay-dependent state estimator for switched Hopfield neural networks can be achieved by solving LMIs, which can be easily facilitated by using some standard numerical packages. The unknown gain matrix is determined by solving delay-dependent LMIs. Finally, a numerical example is provided to demonstrate the effectiveness of the proposed method. © 2011 Springer Science+Business Media B.V.
Seoul National University of Science and Technology | Date: 2014-08-12
The present invention relates to a mesoporous silica/ceria-silica composite and a method for preparing a mesoporous composite and, more specifically, to a mesoporous silica/ceria-silica composite which is composed of mesoporous silica having a hexagonal or cubic structure and ceria having a hexagonal structure provided on a surface and pores of the mesoporous silica, the oxidation state of the ceria being Ce^(4+) and Ce^(3+).
Seoul National University of Science and Technology | Date: 2015-10-30
A multiple beam path laser optical system using a multiple beam reflector. The multiple beam path laser optical system includes a light source part to generate a laser beam to be irradiated to a specimen, the multiple beam reflector to split a laser beam incident thereto from the light source part and to provide a plurality of optical paths, a main beam splitter to irradiate the laser beam split by the multiple beam reflector to the specimen, a transducer to excite the specimen for signal detection of the laser beam irradiated to the specimen, and a control part to analyze an interference pattern of a laser beam reflected from the specimen and recombined in the main beam splitter.
Seoul National University of Science and Technology | Date: 2016-04-06
Disclosed is an open-loop precoder and an open-loop precoding method of a multiple-input multiple-output (MIMO) spatial multiplexing system having a transmitter that is provided with at least two transmit antennas and transmits spatially multiplexed transmit signals and a receiver that is provided with at least two receive antennas and receives the spatially multiplexed transmit signals from the transmitter. The open-loop precoder comprises: a signal decomposition and modulation unit configured to decompose a signal to be transmitted to match the number of the transmit antennas and modulate the decomposed signals; an orthogonal complex matrix condition search unit having a precoding matrix for the number of the transmit antennas; an error minimization parameter determination unit configured to determine an optimum parameter of the precoding matrix such that an error is minimized by assuming a worst channel state; a precoding application unit configured to apply the precoding matrix having the determined parameter to the decomposed and modulated transmit signals output from the signal decomposition and modulation unit; and a transmit unit configured to transmit each of the transmit signals subjected to the precoding matrix via the corresponding transmit antennas. According to the present invention, since the decomposed transmit signals are precoded using the precoders obtained by assuming the transmit correlation coefficient of the worst case and considering the worst channel state capable of preventing performance degradation of the average receive signals, it is possible to prevent performance degradation of the receive signals in the channel without feedback information from the receiver and accordingly reduce the pairwise error probability (PEP).