Changwon National University is a public institution of higher education located in Changwon, an industrial city in the southeast of South Korea. It is home to the country's first graduate school of labor. The school enrolls close to 15,000 students, and employs 304 instructors as of 2004. Wikipedia.
Electronics, Telecommunications Research Institute and Changwon National University | Date: 2010-06-03
The present invention receives simultaneously RF signal of different frequency band and processes the RF signal received, at this time a BPS receiver minimizes aliasing generated by RF signal. The present invention comprises a sampling process unit which samples a signal summing a first RF signal and a second RF signal of different frequency bands with time gap, a quantization process unit which generates a first stream signal and a second stream signal, a digital signal down-converted through respective time information in the signal summing the first RF signal and the second RF signal and a signal process unit which performs FIR filtering with reference to phase shift for a respect frequency band of the first stream signal and the second stream signal, separates the first RF signal and the second RF signal based on a result of the performance.
Changwon National University and Samsung | Date: 2012-03-30
An apparatus and method summarize a users daily life information. The apparatus includes an information collection unit, an analysis unit, a story generator, and a display unit. The information collection unit collects log information including users daily life information, from at least one electronic device. The analysis unit analyzes the log information collected from the information collection unit and decides at least one topic representing the users daily life information. The story generator generates at least one sentence representing the users daily life information using the at least one topic decided in the analysis unit. The display unit displays the at least one sentence generated in the story generator.
Park H.,Changwon National University
Energy Conversion and Management | Year: 2015
In fuel cell powered electric vehicles, the net power efficiency is a critical factor in terms of fuel economy and commercialization. Although the fuel cell stack produces enough power to drive the vehicles, the transferred power to the power train could be significantly reduced due to the power consumption to operate the system components of air blower and cooling module. Thus the systematic analysis on the operating condition of the fuel cell stack is essential to predict the net power generation. In this paper numerical simulation is conducted to characterize the fuel cell performance under various operating conditions. Three dimensional and full-scale fuel cell of the active area of 355 cm2 is numerically modelled with 47.3 million grids to capture the complexities of the fluid dynamics, heat transfer and electrochemical reactions. The proposed numerical model requires large computational time and cost, however, it can be powerful to reasonably predict the fuel cell system performance at the early stage of conceptual design without requiring prototypes. Based on the model, it has been shown that the net power is reduced down to 90% of the gross power due to the power consumption of air blower and cooling module. © 2015 Elsevier Ltd. All rights reserved.
Changwon National University | Date: 2012-08-29
Provided are a culture medium of an adipose-derived stem cell, a method for preparing the same, and a composition for promoting hair growth, in which the composition includes the culture medium. The adipose-derived stem cell (ADSC-T) according to the present invention exhibits long lifespan, improved cell proliferation rate, and extended proliferation period, as compared with a primary adipose-derived stem cell (ADSC), and thus, the adipose-derived stem cell (ADSC-T) can be usefully used for the study about the adipose-derived stem cell and the mass production of the culture medium of the adipose-derived stem cell. In addition, according to the present invention, the culture medium of the adipose-derived stem cell (ADSC-T) that expresses a T antigen of SV40 exhibits excellent hair growth effectiveness and can be usefully used as a raw material for the hair loss prevention and hair growing agents.
Changwon National University | Date: 2013-08-29
The present invention relates to an anti-inflammatory, skin-regenerative, whitening, antioxidant, or wound-healing composition containing a culture medium of adipose-derived stem cell-T (ADSC-T) cells as an active ingredient, in which T-antigen is introduced into an adipose-derived stem cell. The culture medium of ADSC-T cells, according to the present invention, has remarkable effects for treating or inhibiting inflammation by alleviating atopic dermatitis, which is an autoimmune disease, and inhibiting NF-B activities through an increase of an Ib expression. Additionally, the culture medium, according to the present invention, exhibits: excellent skin regenerative effects by having effects of enhancing skin collagen elasticity and reducing wounds, in a collagen culture; excellent skin whitening effects by inhibiting tyrosinase activities and melanin production; and excellent anti-oxidation effects by inhibiting DPPH radical activities. Furthermore, the present invention has remarkable wound-healing effects by enhancing cell mobility of fibroblast, and is thus useful for anti-inflammation, skin-regeneration, whitening, anti-oxidation, or healing wounds.
Changwon National University | Date: 2014-09-19
A method for the biological control of Lasioderma serricorne and a method for the mass rearing of Anisopteromalus apiovorus are disclosed. The method for the biological control of Lasioderma serricorne includes introducing Anisopteromalus apiovorus, which is a natural enemy of Lasioderma serricorne, to a source of Lasioderma serricorne. The method for the mass rearing of Anisopteromalus apiovorus includes inducing Anisopteromalus apiovorus to lay eggs on larvae of Lasioderma serricorne, and allowing the eggs laid by the Anisopteromalus apiovorus to emerge into adult insects.
Changwon National University | Date: 2013-06-12
Disclosed is a method for, when a surface of a workpiece is preheated with a laser beam during milling, calculating an optimum preheating temperature according to a type of the workpiece and controlling a surface preheating temperature. The method includes: a processing condition inputting step; a matching step; a loading step; a preheating step; a measuring step; a comparing step; an ending step; a lower limit determining step; an output increasing step; and an output decreasing step.
Changwon National University | Date: 2014-02-06
The present invention proposes a single poly EEPROM cell including a first control gate capacitor, a first tunnel gate capacitor, a first sense transistor, and a first selection transistor. In a single poly EEPROM cell according to the present invention, a Fowler Nordheim (FN) tunneling method is used in order to increase the recognition distance of an RFID tag chip in mode. In a single poly EEPROM device including a single poly EEPROM cell, the single poly EEPROM cell includes a first control gate capacitor MC1, a first tunnel gate capacitor MC2, a first sense transistor MN1, and a first selection transistor MN2, and the first sense transistor MN1 and the first selection transistor MN2 share a P type well PW.
Changwon National University | Date: 2011-04-14
The present invention provides a preload control device of a magnetic bearing, which includes a main shaft, a housing, a first magnetic bearing mechanism, a second magnetic bearing mechanism, a pressing mechanism, and a sliding member. The main shaft is rotatably formed in the shape of a rod that is longitudinally long. The housing covers and is fixed outside the main shaft. The first magnetic bearing mechanism is disposed between the housing and the main shaft. The second magnetic bearing mechanism is spaced from the first magnetic bearing mechanism in the axial direction of the main shaft, between the housing and the main shaft. The pressing mechanism is disposed between the second magnetic bearing mechanism and the frusto-conical member. The sliding member is disposed between the pressing mechanism and the second magnetic bearing mechanism.
Choi C.,Changwon National University |
Lee W.,Changwon National University
IEEE Transactions on Industrial Electronics | Year: 2012
This paper analyzes and compensates unavoidable time delay effects in a hardware-in-the-loop (HIL) simulation for automotive permanent magnet synchronous motordrive systems. The amount of time delay between a digital controller and HIL simulator is investigated. The effects of the time delay are analyzed by use of s-domain representation of the entire closed-loop system. In addition, a stability study has been carried out using a root locus. The analysis results show that the time delay strongly affects the accuracy and stability of the HIL simulation according to increment of the motor angular speed. For an accurate HIL simulation, a compensation of the time delays is applied and verified through comparison with offline simulation results. © 2012 IEEE.