• International Journal of Advanced Culture Technology
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• v.12 no.1
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• pp.276-280
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• 2024

Recently, many policies and fairs have been made in relation to start-ups. In addition, various start-up education for prospective start-ups is being conducted in various ways. Therefore, these days, the number of prospective start-ups who receive such information and start-up education is increasing. Nevertheless, more and more start-ups are still unsuccessful and close their businesses within months or years. In particular, start-ups who continue to maintain their start-ups also see the unfortunate reality of start-ups that find other jobs in various support systems and related policies and relationships that they cannot quit even if they want to. In this study, based on previous studies, factors for satisfaction with entrepreneurship education will be set and a questionnaire will be conducted for prospective entrepreneurs who have completed education at a startup education center in Seoul. The survey results are intended to verify their reliability and validity through empirical analysis. The SPSS statistical package will be used for analysis, and a total of 200 copies of the questionnaire will be distributed and collected. In this study, it was confirmed that the higher the satisfaction with entrepreneurship education, the better the successful entrepreneurship. In addition, I think that further developing various policies or detailed curriculums for entrepreneurship education will be of great help to prospective entrepreneurs taking entrepreneurship education.

• Proceedings of the KIPE Conference
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• 2011.11a
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• pp.203-204
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• 2011

단일 루프 강인 전압 제어기를 이용한 단상 3kVA UPS 인버터의 비통신선 방식 병렬 운전 결과를 기술한다. 단상 UPS 인버터 2대로 병렬운전 실험 환경을 구축하였고, 주파수-전압 강하 방식의 수하 제어를 이용하여 저항 부하, 비선형 부하에 대한 전력분담을 실험을 통하여 확인하였다.

• Proceedings of the KIPE Conference
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• 1997.07a
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• pp.269-275
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• 1997

This paper presents real time digital signal processor(DSP) control of UPS system feeding processor(DSP) control of UPS system feeding nonlinear loads to provide sinusoidal inverter output voltage. The control scheme is composed of an rms voltage compensator, the load current harmonics feed-forward loop for the cancellation of output voltage harmonics, and the output voltage harmonics feedback loop for system stability. The controller employs a Texas Instruments TMS320C40GFL50 DSP.

• Proceedings of the KIPE Conference
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• 2000.07a
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• pp.689-692
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• 2000

This paper presents a designing for the Off-line UPS usig SMB Flywheel Energy Storage System. This described flywheel energy storage system is designed to replace of the conventional EMB(Electro Mechanical Battery) system. To realize the high efficiency and to minimize the torque ripple the waveform of the inverter output current is controlled to be sinusoidal. The actual performance of the Off-line UPS using flywheel energy storage system is described. The prototype device was manufactured, The experimental result has good characteristics at a time of power transition region and regeneration modes,

• Proceedings of the KIPE Conference
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• 2000.07a
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• pp.744-747
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• 2000

This paper aims at developing remote control system to control and monitor distribute various devices through internet or information communication network. So far for managing UPS(Uninterruptible Power Supply) serial communication system has been used. This paper proposes managing method of UPS monitoring using SNMP. It consists of SNMP agent network board SNMP manager PC software serial communication software and UPS. The proposed method can be applied to various devices with communication network remotely.

• Proceedings of the KIPE Conference
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• 2001.12a
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• pp.93-96
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• 2001

This paper proposed on the Line-Interactive UPS with power factor correction. The paper Line-Interactive UPS topology with its advantages is reviewed. Next introduces Line -Interactive UPS of the series active compensator. The series active compensator controls input currents and power factor.

• Proceedings of the KIPE Conference
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• 1998.10a
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• pp.824-829
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• 1998

In regard to the very stringent-going requirements applied to power supply systems is nowadays applications, the reliability of typical UPS redundency systems are investigated. Several resonable assumptions are made to build up the probability models. The reliabilities of the typical UPS redundency systems are analysed. Their relating Relaibility and MTTF (Mean Time To Faults) are evaluated. It is resulted in that the MTTF of today's UPS redundency systems is unlikely to be beyond 1,000,000 hours.

• Proceedings of the KIPE Conference
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• 2005.07a
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• pp.201-203
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• 2005

A new 3-phase line-interactive UPS(Uninterruptible Power Supply) system with parallel-series active power-line conditioning capability using AC line reactor and two four-leg PWM VSCs(Voltage Source Converters) was introduced recently, In this paper, the strategy of voltage control in suggested UPS system is explained. The objective of proposed voltage controllers in parallel(shunt) and series PWM VSC is to guarantee satisfactory characteristics in steady state and transient state.

• Proceedings of the KIEE Conference
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• 2000.07b
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• pp.1227-1229
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• 2000

The output voltage of UPS must not vary according to the load variation But the output voltage varies due to the load variation when a PI voltage regulator is used which has inherently a static state error. This paper presents a static-error-free digital PID voltage regulator for an UPS inverter to overcome additionally the voltage unbalance problem in three Phase system as well as the above problem.

• Proceedings of the KIPE Conference
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• 2012.07a
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• pp.542-543
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• 2012

본 논문에서는 저항성 수하제어 방식과 단일루프 강인 전압 제어기를 적용하여 단상 UPS 인버터의 비통신선 방식 5-병렬 운전 결과를 기술한다. 단일 루프 강인 전압 제어기를 이용해 단상 3kVA UPS 인버터 5대로 병렬운전 환경을 구축하였고, 저항성 주파수-전압 강하 방식의 수하 제어를 이용하여 저항 부하와 선형 부하에 대한 전력분담 특성을 PSIM 시뮬레이션을 통하여 확인하였다.