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Asan, South Korea

Hoseo University is a private Christian university in Asan, South Korea, known for its large size, 3.471074 km2. It was the first school to establish a graduate school for venture business in South Korea.The university's "World Class 2030" project promotes research in the area of unexplored fields such as the interface of five senses, the expression of the sense of smell, or defense mechanism of invertebrate animals within 20 years.The university was originally a private technical college when it was founded in 1978 in Anseo-dong, Cheonan-si, Chungcheongnam-do, called Cheonwon Technology University. The founder is Seokgyu Kang, and the motto of the school is "We can do it, and it will come true." In 1980, Cheonwon Technology University changed its name to Hoseo University and, in eight years, it was re-formed as a four year collegiate university. The second Hoseo University campus was founded in 1989 in 165, Sechul-ri, Baebang-myun Asan-si, Chungcheongnam-do. The administration facilities of the university were moved to the second Campus in Asan, making the Asan campus the main campus of Hoseo University, and Cheonan campus automatically became the first campus in 1991. The university has a central library, museum, broadcasting company, newspaper, continuing education and health clinic center, etc. It also has several research centers: industrial-educational cooperation research center, small and medium sized businesses research center, industrial technology research center, display technical education research center and environmental bio research center. Wikipedia.

Kim K.-S.,KAIST | Rew K.-H.,Hoseo University
Automatica | Year: 2013

In the paper, an output-based disturbance observer of reduced order is presented for a class of discrete-time linear systems. First, a general form of a disturbance observer is proposed when full states are available. Then, by combining a state function estimator of minimal order, an output-based disturbance observer is derived. The existence condition will be formulated in the form of a static output feedback. Through examples, the effectiveness and advantages of the proposed approach will be demonstrated. A servo control problem in practice is addressed to show the validity of the approach. Furthermore, it will be shown that the proposed approach does provide a smaller order of disturbance observer than that of conventional approaches, while maintaining satisfactory performances. © 2013 Elsevier Ltd. All rights reserved. Source

This paper presents several of the problems encountered with vector-controlled single-phase induction motor (SPIM), and discusses about the complex implementation of a vector controlled SPIM drive. The vector-controlled symmetrical two-phase induction motor (TPIM) is presented as a viable replacement for the vector-controlled SPIM. The implementation of the proposed vector-controlled TPIM is simple compared to the vectorcontrolled SPIM. All the TPIM parameters can be calculated simply and precisely. The proposed strategy for TPIM is derived from the indirect vector control strategy used for three-phase ac machines. Several differences between the vector control strategies for the TPIM and for three-phase ac motor are discussed. The validity of the proposed vector-controlled TPIM was verified by simulations and experiments. © 2012 IEEE. Source

Byeon J.H.,Purdue University | Kim Y.-W.,Hoseo University
ACS Applied Materials and Interfaces | Year: 2013

The gas-phase self-assembly of reduced graphene oxide (rGO) nanoflakes with highly ordered ultrafine titania (TiO2) particles was performed and the resultant hybrid material displayed an enhanced photocatalytic performance, both in producing hydrogen and in degrading dyes. Freshly synthesized TiO 2 nanoparticles (∼35 nm in equivalent mobility diameter) were quantitatively incorporated with nanoscale rGO (∼36 nm in equivalent mobility diameter) in the form of TiO2/rGO hybrid nanoflakes (∼31 nm in equivalent mobility diameter). The TiO2/rGO hybrid flakes were finally employed to evaluate its photocatalytic activity, and it was found that the ability to achieve hydrogen production and dye degradation was greater than that of a hybridized material from commercial p25-TiO2 and large rGO. This gas-phase self-assembly also enhanced the photocatalytic activity by applying different spark configurations to prepare ZnO, Au, or Ag particles incorporated with rGO nanoflakes. © 2013 American Chemical Society. Source

Chun S.M.,Hoseo University
Tribology International | Year: 2011

In this paper, by predicting the real time variation in wears of piston-ring face, ring-groove and cylinder bore altogether, the changing end gap of each ring and the changing volume of gas reservoir are calculated. Next, the calculated amount of parts' wear and oil consumption are compared with the amount of normal wear of each part and normal oil consumption. Then, the durability limit of a piston-ring pack-cylinder bore system is predicted. Finally, the life time of a test engine in terms of abnormal oil consumption caused by the accumulated wear of ring faces and cylinder bore is estimated. © 2010 Elsevier Ltd. All rights reserved. Source

Choi W.-S.,Hoseo University
Electronic Materials Letters | Year: 2012

As an interlayer for source-drain electrodes in solution processed zinc tin oxide (ZTO) thin-film transistor, MoO 3 was introduced between aluminum source-drain electrodes and oxide semiconductor. MoO 3 was detected not only in the interlayer, but in the source-drain electrodes and oxide semiconductor layer. The chemical configuration and the structural configuration were confirmed by XPS interfacial study and by TEM analysis, respectively. From these analytical tools, we found that the interlayer exists as a chemically mixed state between the layers, source-drain electrodes and oxide semiconductor. © 2012 The Korean Institute of Metals and Materials and Springer Netherlands. Source

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