• Journal of Service Research and Studies
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• v.5 no.2
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• pp.161-176
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• 2015

The significance of upgrading current certification service for customer center manager and counsellor in Korea Call Center Information Research Center-affiliated Call Center College is dramatically increasing due to steady applicants for the last few years, while there is a need to expand the numbers of applicants with a new channel. This paper has suggested the directions for developing IBT system to hold a dominant position in the certification business industry. Providing IBT channel, mainly base upon internet and utilizing various IT infra for the PCCM (Preliminary Customer Center Manager)/CCCM (Certified Customer Center Manager), will increase the convenience of taking qualification exams for customer center managers and improve competitiveness in qualification certification business industry. Specifically, this study reviews overview of industry trends of domestic and overseas, success cases of test services, service model and methods of on-line test, and short and long term analysis of the domestic and overseas markets.

• Aerospace Engineering and Technology
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• v.2 no.1
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• pp.108-116
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• 2003

This research presents the design and analysis of PCDU(Power Control & Distribution Unit) of communication satellite. The PCDU of a spacecraft must provide adequate power to each subsystem and payload during mission life, and it also needs high reliability and performance in space environment. A control circuit of the PCDU include bus sensing and filter circuits, error signal amplification circuit, error compensation circuit of SAS(Shunt Assembly Switch) and BPC(Battery Power Converter). The phase margin and DC gain for the designed circuits are analyzed through the frequency response characteristics of the compensated control circuit. And also the transfer function of the battery power converter circuit are discussed at the battery CCCM(Charge Continuous Conduction Mode) and battery C/DCCM(Continuous/Discontinuous Conduction Mode).