• 경영과정보연구
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• 제36권2호
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• pp.223-237
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• 2017

전환장벽은 고객의 이탈을 막는다는 점에서 주로 긍정적인 측면이 강조되었으나, 최근에는 기업이 설정한 전환장벽이 장기적으로 해로울 수 있음이 논의되기 시작하였다(Jones et al. 2000; 정윤희, 2012). 전환장벽의 부정적 영향에 관한 기존연구에서는 전환장벽이 소비자의 전환의 자유를 방해한다는 점에서 부정적 심리반응을 이끌 수 있음은 보여주었으나, 당장 기업에 줄 수 있는 부정적인 영향에 대한 논의는 부족하였다. 따라서 본 연구에서는 전환장벽으로 인해 전환을 못하는 상황에 서비스 실패상황에 관한 연구를 적용하여 소비자들의 전환장벽에 대한 부정적 감정과 불평행동에 대한 연구를 진행하고자 하였다. 전환을 어렵게 하는 전환장벽의 귀인(내적 혹은 외적)에 따라 후회와 원망을 경험하게 되고 이는 수용, 불평행동, 부정적 구전으로 이어질 것으로 가정하였다. 구조방정식 모형을 이용해 가설 검증한 결과, 내적귀인은 후회에 긍정적 영향을 주고, 외적귀인은 원망에 긍정적 영향을 주는 것으로 나타났다. 그리고 후회는 수용과 불평행동에 영향을 주고, 원망은 불평행동과 부정적 구전에 긍정적 영향을 미침을 확인하였다. 이러한 결과는 전환장벽이 고객들의 부정적 감정과 불평행동을 이끌어 기업에 즉각적 피해를 줄 수 있음을 보여줌으로써 기존연구를 확장하고 있으며, 전환장벽에 대한 신중한 실무적 활용을 시사한다.

• 수산해양기술연구
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• 제35권1호
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• pp.35-40
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• 1999

We selected horse mackerel Trachurus japonicus, mackerel Scomber japonicus and arrow squid Todarodes pacificus, to use in the experiment. These fishes migrate to the Cheju coast and were caught by set-net. We studied the leading effect on the fish schools using the attracting lamps in an outdoor water tank at the Marine Research Institute in Cheju National University. The results obtained are summarized as follows; 1. The attracting rate of fish schools was increasing as the time between switching on and off each lamp was getting longer when each of the attracting lamps was switched on and off in order. However, the attracting rate of mackerel school showed a tendency to be higher than that of the other two species. 2. The attracting rate of fish schools was increasing as the time of switching off the lamps was getting longer when the attracting lamps which had been switched on were switched off in order. However, the attracting rate of mackerel school showed a tendency to be higher than that of the other two species. 3. The attracting rate of fish schools was decreasing as the speed of moving the attracting lamp was getting faster when the attracting lamp was moving. However, the attracting rate of mackerel school showed a tendency be higher than that of the other two species. 4. To determine the distance between the attracting lamps, there would be two methods. One is switching on and off the attracting lamps in order, and the other is switching off the attracting lamps in order which had been switched on. The methods showed that the attracting rate of fish schools were decreasing as the distance between the attracting lamps were getting longer. However, the attracting rate of mackerel school showed a tendency to be higher than that of the other two species.

• 대한전자공학회논문지
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• 제18권2호
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• pp.27-35
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• 1981

본 연구에서는 비정질 갈코게나이트박막의 스위칭과도 특성을 분석하기 위해 공체전하중를 모델에 의한 수식적 이론과 그 이론의 타부성에 따른 실험을 연하였다. 이론과 실험에 대한 분석적인 관찰을 실온에서 비정용 잘코게나이드박막에 전압펄스를 인가할 때 생기는 스위칭과도 특성에 대해 비교하였다. 결과로는 전자스위칭 특성에 대한 단순한 이론적 모델의 형태로 설명할 수 있다. 캐리어의 주입은 스위칭 특성을 유발시키기에 필요하며 주입된 캐리어들은 공간전하제한전류(SCLC)로서 전류 흐름에 기여한다. 그러므로 제안된 전하제어 스위칭 특성은 2중 주입 공간 전하중첩 모델로 해석할 수 있다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 F
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• pp.2213-2216
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• 1997

Efficient Switching of IGBT's requires fast gate drivers with high peak currents. This Paper will review the requirements for effient, reliable gate drive of IGBT's and behaviour of an IGBT switching chacteristcs. The purpose of the present paper is to investigate the switching loss mechanisms in IGBT such as MOSFETs in order to give a support to designers of IGBT gate drive circuits in selecting the more appropriate IGBTs to be used on the basics of design repuirements.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1999년도 추계종합학술대회 논문집
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• pp.191-194
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• 1999

Switching behaviour of the ferroelectric thin film and device characteristics of the MFSFET (Metal-Ferroelectric-Semiconductor FET) are simulated with taking into account the accumulation of oxygen vacancies near interface between the ferroelectric thin film and the bottom electrode caused by the progress of fatigue. We show net switching current decreases due fatigue in the switching model. It indicates that oxygen vacancy strongly suppresses polarization reversal. The difference of saturation drain current of the device before fatigue is shown by the dual threshold voltages in I$_{D}$-V$_{D}$ curve as 6㎃/$\textrm{cm}^2$ and decreases as much as 50% after fatigue. Our simulation model is expected to play an important role in estimation of the behavior of MFSFET device with various ferroelectric thin films.lms.

• 대한전자공학회논문지SD
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• 제37권6호
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• pp.24-33
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• 2000

피로현상의 진행에 따라 발생하는 하부전극 주위의 산소공공 축적현상을 적용하여 강유전체 박막의 switching 특성과 MFSFET 소자특성을 시뮬레이션하였다. Switching 모델에서 relative switched charge는 피로현상 전에 0.74 nC 이였으나, 피로가 진행되어 50${\AA}$의 산소공공층이 생성된 후에는 불과 0.15nC 로서 산소공공층이 분극반전을 강력하게 억제함을 알았다. MFSFET 소자의 모델에서 C-V_G와 I_D-V_G 곡선은 2 V 의 memory window를 나타내었고, 캐패시턴스 특성에서 축적과 공핍 및 반전 영역은 확실하게 표현되었다. 그리고, $I_D-V_D$ 곡선에서 두 부분의 문턱전압에 의해 나타난 포화드레인 전류차이는 6mA/$cm^2$이었다. 그러나, 50${\AA}$의 산소공공층이 축적된 후, $I_D-V_D$ 곡선에서 포화 드레인 전류차이는 피로현상이 없는 경우에 비해 약 50% 감소하여 산소공공층이 소자 적용에 난제임을 확인하였다. 본 모델은 강유전체 박막의 다양한 특성과 임의의 강유전체 박막을 사용한 MFSFET 소자의 동작을 예측하는데 중요한 역할을 할 것으로 판단된다.

• 지식경영연구
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• 제12권3호
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• pp.39-58
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• 2011

As the information from today's knowledge-based society alters the awareness of patients and provides a wider selection of medical institutions, the reality of medical institution management is struggling compared to the past. CRM was introduced to domestic hospitals as marketing strategy to dominate the competition under varying medical environment. Thus, this research invests on CRM activity types used in hospitals and the effects of CRM activities toward loyalty and switching intention. Futhermore, we investigate the mediating role of customer relationship commitment and termination in CRM activities. The subjects in this study included three hundred customers who are using hospital settings or who had experience with using the hospital settings. The researcher collected 262 survey questionnaires from May 23th, 2011 to June first. In order to evaluate the hypothesis in this study, structural equation model was analyzed by using AMOS 18.0.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2011년도 제40회 동계학술대회 초록집
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• pp.9-9
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• 2011

There has been strong demand for novel nonvolatile memory technology for low-cost, large-area, and low-power flexible electronics applications. Resistive memories based on metal oxide thin films have been extensively studied for application as next-generation nonvolatile memory devices. However, although the metal oxide-based resistive memories have several advantages, such as good scalability, low-power consumption, and fast switching speed, their application to large-area flexible substrates has been limited due to their material characteristics and necessity of a high-temperature fabrication process. As a promising nonvolatile memory technology for large-area flexible applications, we present a graphene oxide-based memory that can be easily fabricated using a room temperature spin-casting method on flexible substrates and has reliable memory performance in terms of retention and endurance. The microscopic origin of the bipolar resistive switching behaviour was elucidated and is attributed to rupture and formation of conducting filaments at the top amorphous interface layer formed between the graphene oxide film and the top Al metal electrode, via high-resolution transmission electron microscopy and in situ x-ray photoemission spectroscopy. This work provides an important step for developing understanding of the fundamental physics of bipolar resistive switching in graphene oxide films, for the application to future flexible electronics.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2001년도 Proceedings ICPE 01 2001 International Conference on Power Electronics
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• pp.746-750
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• 2001

During the last decades several proposals have been made in literature to use predictive control for inverter control-especially in electrical drives. These algorithms are completely different to the recursive but linear predictive algorithms known from information theory, where closed mathematical equations are used (e.g. Kalman-filters). Only few of the presented schemes have been realized in industrial applications so far. After some further progress, however, the advantage of predictive algorithms might lead to an increased number of industrial implementations in the future. Besides the common basic idea - to use the well-known but strongly non-linear behaviour of inverters to precalculate the best switching times - there are many differences in the details of these proposals. This contribution shows similarities and differences and attempts to design a 'family tree' of predictive control algorithms. This might grow to a first step to a theoretical approach to deal with predictive control schemes in a more generalised way.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 추계학술대회 논문집 학회본부 B
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• pp.643-645
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• 1999

In experiment, a real inverted pendulum system has state constraints and limited amplitude of input. These problems make it difficult to design a swing-up controller. To overcome these problems, we design a sliding mode controller considering physical behaviour of the inverted pendulum system. This sliding mode controller uses a switching control action to converge along a specified path derived from energy equation from a state around the path to desired states(standing position). And optimal control method is used to guarantee stability at unstable equilibrium position. The designed controller can be applied to all inverted pendulum systems regardless of the values of their parameters. Compared with previous existing controllers, it is simple and easy to tune. Experimental results are given to show the effectiveness of this controller.