• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 A
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• pp.336-338
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• 1996

In this paper, a simple control strategy to interconnect the utility line system for three-phase inverter. Conventionally, such interconnection is based on the 3-phase time-domain waveform analysis, though the control based on the plane defined by the two-axis theory is common in the area of the motor control. The new instantaneous power control strategy is introduced, which is based on the d-q axis theory. Simulation results show that proposed control method has good controllability with simple strategy.

• 경영과정보연구
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• 제25권
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• pp.35-55
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• 2008

We draw on well-established thinking in the complementary fields of organization theory and strategic management to develop a model explaining why fit among a firm's competitive strategy, its structure, and its technology is a prerequisite for superior performance. The contributions of this theoretical treatise are twofold. Firstly, it helps reduce the disconnect in thinking that exists between the strategy and organization-theory literatures on business-level issues. Secondly, it reveals the importance of managing the coalignment among strategy, structure, and technology which, in turn, forces recognition that competitive advantage does not exist in a static state but in a dynamic condition.

• Educational Technology International
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• 제15권2호
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• pp.89-115
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• 2014

This research aims to develop an elementary school English e-learning system based on the 'Self-determination theory (SDT)', which is widely applied to traditional face-to-face foreign language classes. The study also attempts to verify whether SDT-a traditional motivational theory that has been applied to face-to-face classes- is effective in an e-Learning environment with students who use this newly developed system. For the purposes of this project, the following three actions were carried out. First, a motivational strategy based on SDT was deduced. In SDT, the needs for autonomy, competence, and relatedness were introduced as basic psychological needs, and assumed that these three needs provided the natural motivation for learning, growth, and development. Second, an e-Learning system was created based on the deduced motivational strategy. Third, the system was implemented in 115 private tuition academies, and education was provided to 1,400 users for one year across the country. Afterwards, by surveying users, correlation between the role of the three psychological needs in learning English, and also the correlation between each need and motivation were investigated. Research results showed that traditional motivational theories used in face-to-face classes so far were effective in an e-Learning environment.

• 유통과학연구
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• 제13권3호
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• pp.61-67
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• 2015

Purpose - Exports have long been regarded as significant drivers of sustainable competitive advantage and growth among small and medium enterprises (SMEs). The export activities of SMEs are particularly important in the context of export-oriented economies such as Korea. Although many studies have examined the determinants of exports, it is difficult to find empirical studies about the determinants of the export performance of regional SMEs. This study investigates the determinants of export performance in the regional SME context based on an integrated approach that combines the environment factor of industrial organization theory, competitive strategy theory, and the competences of the resource-based view. Research design, data, and methodology - To empirically analyze the determinants of export performance in the regional SMEs, data were collected from firms in the Daegu metropolitan area. Data were collected directly through questionnaire surveys; in addition, secondary financial data were also taken from the KIS-VALUE database. Out of the 175 responses that were received, 143 were considered to be worth examining. After testing the reliability and validity of the variables through multiple items such as environmental turbulence and competitive strategy, hypotheses were verified by using five multi-regression models. These models were: a control model with organizational size and age, an environmental model with technology and market turbulence, a competency model with R&D and foreign distribution channels, a strategy model with product and market differentiation, and an integrated model including all of these variables. Results - First, as a control variable, the organization size has significant positive effects on export performance. Second, technology turbulence based on industrial organization theory has significant positive effects on export performance, but market turbulence does not affect export performance. Third, the foreign market distribution competency of the resource-based view has strong positive effects on export performance, but the R&D competency does not affect export performance. Fourth, the product differentiation strategy from competitive strategy theory positively impacts export performance, but market differentiation does not affect export performance. Finally, in the integrated model, only the foreign distribution competency of the resource-based view has a significant effect on export performance. Conclusions - The empirical results of this study verified the usefulness of the rationales behind the three theories to explain the export performance of the regional SMEs, especially the importance of the foreign market distribution competency from the resource-based view. With regard to practical considerations, this study's implications suggest that the use of technological environmental changes by industries is better than the use of market changes. Further, the use of the product differentiation strategy is more effective than the use of the market-driving strategy, and the distribution channel competency plays a stronger role than the technology-oriented competency with regard to the export performance position of regional SMEs. Future studies should examine relational perspectives, such as trust among channel partners. Therefore, the configuration approach is more useful in enhancing pragmatism by comparing high- and low-export companies.

• 대한공업교육학회지
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• 제38권2호
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• pp.176-194
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• 2013

본 연구의 목적은 2009 개정 교육과정에 따른 중학교 1~3학년 기술 가정 교과서 '건설기술과 환경' 단원을 Reigeluth의 정교화이론에 근거하여 내용체계를 분석하여 단원의 내용체계와 개선해야 할 부분을 살펴보고, 차후 교과서 집필 시 필요한 기초자료를 제공하는데 있다. 이 연구의 결과는 다음과 같다. 첫째, 각 교과서는 12종 모두 절차적 방법에 의한 정교화 과정을 제시하여 내용체계를 구성하였다. 둘째, '건설기술과 환경' 단원은 선수학습능력의 계열화 전략으로 '생각열기'를 많이 제시하였으며, 요약자의 사용전략으로 단원을 끝부분에 제시되는 '단원마무리'를 중점적으로 제시하였다. 또한 종합자의 사용전략으로는 용어의 차이는 있지만 대부분 그 단원을 배우고 난 후 학생들의 성취 정도를 나타내는 '학습목표'가 가장 많이 제시되었다. 인지전략의 활성자 전략으로는 모든 교과서에서 '그림', '표', '도식', '용어설명'이 사용되었으며, 특히 '그림'은 인지전략의 활성자 전략에서 다른 모든 요소에 비하여 압도적으로 많이 제시되었다. 마지막으로 학습자 통제 전략으로는 '보충학습'과 '심화학습'이 각각 4종과 5종에서 제시되었고, '더 나아가기', '더 알고가기', '생각넓히기', '하나 더 알기' 등 다양한 용어로 활용되었다. 셋째, 정교화 이론의 7가지 교수전략 중 비유의 활용 전략은 교과서의 단원별 구성 항목에서는 거의 이용되지 않았다. 이는 Reigeluth가 7가지의 전략 중에 비유를 강조한 점과는 대조적인 것을 알 수 있다.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회 1989년도 추계학술발표회 발표논문초록집; 이화여자대학교, 서울; 23 Sep. 1989
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• pp.88-88
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• 1989

• Journal of applied mathematics & informatics
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• 제17권1_2_3호
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• pp.185-194
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• 2005

A Server-Proxies-Users communication system is studied by using Stackelberg strategy theory of game. A new model, in which the server, proxies and users are not equal is established, and that is a three-level programming. The solution existence of the model is proved.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제6권12호
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• pp.3133-3151
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• 2012

The optimal price strategy selection of two bounded rational cognitive mobile virtual network operators (MVNOs) in a duopoly spectrum sharing market is investigated. The bounded rational operators dynamically compete to sell the leased spectrum to secondary users in order to maximize their profits. Meanwhile, the secondary users' heterogeneous preferences to rate and price are taken into consideration. The evolutionary game theory (EGT) is employed to model the dynamic price strategy selection of the MVNOs taking into account the response of the secondary users. The behavior dynamics and the evolutionary stable strategy (ESS) of the operators are derived via replicated dynamics. Furthermore, a reward and punishment mechanism is developed to optimize the performance of the operators. Numerical results show that the proposed evolutionary algorithm is convergent to the ESS, and the incentive mechanism increases the profits of the operators. It may provide some insight about the optimal price strategy selection for MVNOs in the next generation cognitive wireless networks.

• 대한수학회보
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• 제49권6호
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• pp.1251-1254
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• 2012

Pure-strategy Nash Equilibrium (NE) is one of the most important concepts in game theory. Tae-Hwan Yoon and O-Hun Kwon gave a "sufficient condition" for the existence of pure-strategy NEs in matrix games [5]. They also claimed that the condition was necessary for the existence of pure-strategy NEs in undominated matrix games. In this short note, we show that these claims are not true by giving two examples.

• 한국게임학회 논문지
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• 제11권2호
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• pp.57-68
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• 2011

본 연구는 새롭게 탄생한 온라인 게임 기업이 시장 성장주기(도입기-성장기-성숙기)에 따라 어떻게 다원화 전략을 행하여 왔는가를 자원기반이론과 진화이론의 관점에서 실증적 사례 분석을 통해 그 역사적 진행 과정을 체계적으로 분석하였다. 초기 온라인 게임 기업들은 진입 조건(장르, 기술력, 이용자특성)에 따라 다른 전략(기술역량기반, 서비스역량기반)을 통해 성장하였다. 이후 성장기에 이들 기업들은 제품 다원화를 위해 자원기반(기술기반전략, 서비스기반전략)에 따라 경로의존적 제휴 전략(보완적, 대체적 제휴)을 수행하여왔다. 그러나 성숙기에 이들 기업들은 기존 경로의존적 전략을 뛰어넘어 이용가능한 모든 자원 역량을 동원하는 통합 전략을 자연적으로 선택함으로서 시장 성장주기에 탄력적으로 적응하였다. 이러한 분석 결과는 진화이론과 자원기반이론을 복합적으로 적용하여 새롭게 탄생한 산업에서 시장의 단계별 성장주기에 따라 온라인 게임 기업의 제휴 전략 패턴이 어떻게 자기조직화 하고 있는지 분석함으로써 새로운 산업적, 정책적, 이론적 모델이 요구되고 있음을 제시하고 있다.