• Proceedings of the KIPE Conference
• /
• 2017.11a
• /
• pp.147-148
• /
• 2017

• Proceedings of the KIPE Conference
• /
• 2017.11a
• /
• pp.185-186
• /
• 2017

• The Journal of Information Technology
• /
• v.10 no.2
• /
• pp.65-80
• /
• 2007

The development of social enterprise is rapidly emerging trend in Europe. Social enterprises are businesses with a social purpose working. There is no single legal model for social enterprise. There are many social enterprises operating in a wide range of industries from farmers markets and recycling companies to transport providers and childcare. Common characteristics of Social enterprise are Enterprise Orientation, Social aims, Social ownership.

• Proceedings of the KIEE Conference
• /
• 2008.07a
• /
• pp.659-660
• /
• 2008

This paper presents a hybrid winding connection method for torque characteristics improving of a traction SRM. In order to get a high torque in wide speed range and torque ripple reduction, series and parallel winding connection are changed according to operating speed. From the analysis of torque character operation mode and efficiency, the proposed control scheme is verified.

• Proceedings of the KIPE Conference
• /
• 2010.07a
• /
• pp.489-490
• /
• 2010

A novel soft-switching two-switch flyback converter is proposed in this paper. This converter is composed of two active power switches, a flyback transformer, and two passive regenerative clamping circuits.The proposed converter has the advantages of a low cost circuit configuration, a simple control scheme, a high efficiency, and a wide operating range. The circuit topology and experimental results of the new flyback converter are presented.

• 제어로봇시스템학회:학술대회논문집
• /
• 2000.10a
• /
• pp.202-202
• /
• 2000

In this paper, the synchronous generator model which is derived from the swing equation and the Park's equation is transformed to an adequate form for feedback linearization. And the single controller is designed in order to play the role of both PSS and AVR. The result of the simulations shows that the stability of the system is guaranteed in the wide range of operating points.

• Proceedings of the KIPE Conference
• /
• 2018.07a
• /
• pp.1-2
• /
• 2018

• Proceedings of the KIPE Conference
• /
• 2018.07a
• /
• pp.318-319
• /
• 2018

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.28 no.3
• /
• pp.186-194
• /
• 2017

In this paper, we analyze the main performance of satellite's Synthetic Aperture Radar system for high resolution and wide swath. We have used the radiation pattern of reflector antenna with array feed and comparison between the conventional ScanSAR mode and SweepSAR mode has been carried out. The SweepSAR mode is a high-resolution wide-swath mode that transmits beams over a wide range and receives echo signals through sequential beamforming based on SCORE(SCan On REceive). In this paper, we analyzed the operating principle and characteristics of satellite's SweepSAR mode and simulate system performances. In addition, in order to increase the utilization of image, performances analysis for multiple frequency bands(C-band, X-band) has been considered.

• Proceedings of the IEEK Conference
• /
• summer
• /
• pp.218-220
• /
• 2004

A new wide-band VCO topology using Miller capacitance is proposed. Contrary to conventional VCO using the Miller capacitance where the variable amplifier gain is negative, the proposed VCO uses both the negative and positive variable amplifier gain to enhance the frequency tuning range significantly. The proposed VCO is simulated using HSPICE. The simulations show that 410MHz and 220MHz frequency tuning range are obtained using the negative .and positive variable amplifier gain, respectively. The tuning range of the proposed VCO is $23\%$ of the center frequency(2.8GHz). The phase noise is -104dBc/Hz at 1MHz offset by simple model. The operating current is only 3.84mA at 2.5V power supply.