• The Journal of the Korea Contents Association
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• v.9 no.12
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• pp.235-244
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• 2009

The object of this research is to analyze the impact of the four dimensions of on-line game attributes, challenge, social interaction, entertainment and actuality, on customer satisfaction and loyalty. At the same time, mediating effects of switching barriers, such as switching cost and attractiveness of alternatives on the relationships between customer satisfaction and customer loyalty are also analyzed. The results showed that the challenge, social interaction, entertainment had significant effects on customer satisfaction. Customer satisfaction also effected customer loyalty. Another important result is that switching cost and attractiveness of alternatives played an intermediating role between customer satisfaction and customer loyalty.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.39 no.6
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• pp.44-50
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• 2002

A novel technique for minimization of simultaneous switching noise is Presented. Dual Layer Power Line (DLPL) structure i:; newly proposed for a possible silicon realization of a mutual inductor, with which an instant large current in the power line is half-divided flowing through two different, but closely coupled, layers in opposite directions. This mutual inductance between two power layers enables us to significantly reduce the switching noise. SPICE simulations show that with a mutual coupling coefficient higher than 0.8, the switching noise reduces by 63% compared to the previously reported solutions. This DLPL technique can also be applied to PCB artworks.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.8 no.5
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• pp.1068-1073
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• 2004

5 V/500 mA transless type power module was designed by using a semiconductor switching technique for a small-sized electric power source. It used voltage drop type chopper method, and is composed of switching circuit, control circuit, voltage detect circuit, and constant voltage circuit. The switching power module which is designed in this study, showed load regulation of 0.2 V, line regulation of 0.1 V, output ripple of 85 mVp-p, switching frequency of 64.7 kHz, maximum power efficiency of 58 %, and satisfied its reliability and EMC test.

• Journal of the Korean Institute of Telematics and Electronics
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• v.24 no.4
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• pp.652-657
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• 1987

This paper describes an application of CMOS Gate Array Integrated Cricuits to the implementation of three functional units: A Multiplexer, Time Switch, and Demultiplexer in the Switching Network and Digital Line Concentrator of TDX-1 system, which is a fully digital time division electronic switching system in Korea. The application of CMOS Gate Array Integrated Circuits significantly improves the overall system performance in terms of power consumption, cost, size, reliability, and timing margin, etc.

• Journal of Electrical Engineering and Technology
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• v.8 no.2
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• pp.359-363
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• 2013

The 765kV transmission line will be maintained by live-line works for efficient operation. In order to maintain the 765kV transmission lines safely by live-line works, lineman has to know switching impulse flashover characteristics of the jumper V-strings with damaged insulators in advance. In order to know the flashover characteristics this paper carried out experimental flashover mockup tests for jumper V-string with damaged insulators in the outdoors. And it suggests flashover characteristics of the 765kV jumper V-strings also. The results will be used in estimating the safety of live working for 765kV transmission lines.

• Journal of the Korean Statistical Society
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• v.8 no.1
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• pp.65-83
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• 1979

The general description concerning the multi-line systems with the switching rules have been presented by Ahn. In this paper we derive some steady state probabilities for three mainly different kinds of systems. We assume that all of the systems are to have poisson input with the finite mean $1/\lambda$ and two servers with the negative exponentional service distribution where each has its own mean $1/u_i$. The notations follow the paper (Ahn, 1979).

• Journal of Power Electronics
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• v.3 no.4
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• pp.239-248
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• 2003

This paper presents a novel prototype of three-phase voltage source type zero voltage soft-switching inverter with the auxiliary resonant snubbers suitable for high-power applications with IGBT power module packages in order to reduce their switching power losses as well as electromagnetic conductive and radiative noises. A proposed single inductor-assisted resonant AC link snubber circuit topology as one of some auxiliary resonant commutation snubbers developed previously to achieve the zero voltage soft-switching (ZVS) for the three-phase voltage source type sinewave PWM inverter operating under the instantaneous space voltage vector modulation is originally demonstrated as compared with the other types of resonant AC link snubber circuit topologies. In addition to this, its operation principle and unique features are described in this paper. Furthermore, the practical basic operating performances of the new conceptual instantaneous space voltage vector modulation resonant AC link snubber-assisted three-phase voltage source type soft-switching PWM inverter using IGBT power module packages are evaluated and discussed on the basis of switching voltage and current waveforms, output line to line voltage quality, power loss analysis, actual power conversion efficiency and electromagnetic conductive and radiative noises from an experimental point of view, comparing with those of conventional three-phase voltage source hard-switching PWM inverter using IGBT power modules.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.15 no.5
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• pp.461-466
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• 2004

In this paper, the novel patch antenna for polarization diversity using switching element is presented. The proposed antenna consists of the square patch with a pair of truncated corners and a microstrip-feed line with power divider. A switching microstrip-line feed works at schottky diode ON / OFF that is placed at $\lambda$/4 point from branch-off point of power divider. Polarization diversity has two types(LHCP. RHCP) as switching the schottky diodes. The measured 3 ㏈ axial ratio bandwidth for switching operation is about 2 %.

• Journal of Power Electronics
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• v.16 no.2
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• pp.498-511
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• 2016

This paper presents a single-phase five-level inverter controlled by two novel pulse width modulation (PWM) switching techniques. The proposed PWM techniques are designed based on minimum switching power loss and minimum total harmonic distortion (THD). In a single-phase five-level inverter employing six switches, the first proposed PWM technique requires four switches to operate at switching frequency and two other switches to operate at line frequency. The second proposed PWM technique requires only two switches to operate at switching frequency and the rest of the switches to operate at line frequency. Compared with conventional PWM techniques for single-phase five-level inverters, the proposed PWM techniques offer high efficiency and low harmonic components in the output voltage. The validity of the proposed PWM switching techniques in controlling single-phase five-level inverters to regulate load voltage is verified experimentally using a 100 V, 500 W laboratory prototype controlled by dspace 1103.

• The Journal of the Korea Contents Association
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• v.13 no.10
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• pp.452-460
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• 2013

Nowadays IT service users meet various new IT services and are considering a switch into a new IT service. IT service providers are also developing the strategies to retain and expand their customer base. Studies on switching intention have been one of the most interesting topics in the on-line and off-line markets. In this paper we investigate the factors influencing the IT service switching intention. Our research model includes the relationship between 'switching intention' and 'habit', 'alternative attractiveness', 'present service satisfaction'. In addition, we try to find the effect that 'habit' and 'alternative attractiveness' give to 'switching intention' through 'present service satisfaction'. Finally, the moderating effects of 'switching cost' are examined. This empirical paper proves that 'habit' and 'present service satisfaction' give effects to 'switching intention', and 'alternative attractiveness' give the indirect effects to 'switching intention'. In addition, 'switching cost' has the moderating effects between 'switching intention' and 'habit'.