• Journal of Power Electronics
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• 제12권5호
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• pp.758-768
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• 2012

This paper presents the modeling and position-sensorless vector control of a dual-airgap axial flux permanent magnet (AFPM) machine optimized for use in flywheel energy storage system (FESS) applications. The proposed AFPM machine has two sets of three-phase stator windings but requires only a single power converter to control both the electromagnetic torque and the axial levitation force. The proper controllability of the latter is crucial as it can be utilized to minimize the vertical bearing stress to improve the efficiency of the FESS. The method for controlling both the speed and axial displacement of the machine is discussed. An inherent speed sensorless observer is also proposed for speed estimation. The proposed observer eliminates the rotary encoder, which in turn reduces the overall weight and cost of the system while improving its reliability. The effectiveness of the proposed control scheme has been verified by simulations and experiments on a prototype machine.

• 중소기업연구
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• 제32권1호
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• pp.65-87
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• 2010

본 연구의 목적은 기술혁신형중소기업(이노비즈)의 건전한 성장발전을 위하여 기업의 중요한 전략적 자원으로 인식되고 있는 기술혁신능력과 기술사업화능력이 시장정보지향성을 매개로 경영성과에 미치는 영향을 분석하여 기술혁신형중소기업의 효율적인 경영관리와 정부의 정책방향에 시사점을 제공하고자 하는데 있다. 이러한 목적을 달성하기 위하여 우리나라 기술혁신형 중소기업를 대상으로 오슬로매뉴얼과 선행연구를 토대로 연구개발능력, 기술축적능력, 기술혁신체제를 기술혁신능력으로, 제품화능력, 생산화능력, 마케팅능력을 기술사업화능력으로 구성하고, 이들 요인들이 시장정보지향성을 매개 변수로 경영성과에 미치는 영향을 실증분석을 통하여 검증하였다. 연구결과에 의하면, 제품경쟁력 향상과 같은 기술의 상업적 성과와 직접적인 관련이 있는 경영성과는 기술혁신체제나 생산화능력, 마케팅능력 등의 경영관리적 측면에서의 능력이 상대적으로 큰 영향을 미치며 기술적 성과를 의미하는 신기술/신제품개발 성과는 연구개발능력, 기술축적능력, 제품화능력 등 공학적 측면에서의 능력이 상대적으로 큰 영향을 미친다는 것을 보여 주었다. 또한 시장정보지향성과 관련하여 신기술/신제품개발 등의 기술적 성공을 위해서는 조직내부에서의 정보확산 수준이 상대적으로 크게 부각되고 있고, 제품경쟁력 향상 등 상업적 성공을 이루기 위해서는 정보에 대한 반응수준이 더 크게 요구된다는 점을 함축하고 있다.

• 기술혁신연구
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• 제20권2호
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• pp.75-107
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• 2012

본 연구에서는 기술혁신의 결정요인 도출 또는 기술혁신의 투입과 산출 간 관계에만 집중한 기존 연구의 한계, 기술혁신의 연결 메커니즘 연구의 필요성 제기 및 관련 연구들이 실태조사 수준에 머물러 있는 현실, 대기업과 중소기업의 기술혁신 추진과정 차이 등에 따라 중소기업의 기술혁신 관리요소에 관한 실증연구를 실시하였다. 이를 위해 자원기반 및 시스템 관점에서 주요 기술혁신 관리요소를 도출 분류하여 연구모형을 제시하였고, 중소기업을 대상으로 실증적으로 규명하였다. 세부적으로 살펴보면, 투입(R&D리더십, 혁신전략, R&D투자, R&D인적자원관리 및 외부네트워크), 과정(포트폴리오관리, 프로젝트관리 및 사업화) 및 산출(기술혁신) 간 관계를 실증 분석하였다. 대구지역 223개의 중소기업을 대상으로 한 구조방정식모형 분석 결과, 투입요소 간 관계, 투입요소와 과정요소 간 관계, 과정요소 간 관계, 그리고 과정요소와 산출요소 간 관계가 전반적으로 긍정적으로 유의하였다. 그러나 투입요소와 과정요소 간 관계에서 R&D투자가 포트폴리오관리와 프로젝트관리에 유의한 영향을 미치지 못하는 것으로 나타났는데, 이는 R&D투자가 독립적으로 과정요소에 영향을 미치기보다 우수한 인적자원, 유용한 정보와 기술이 뒷받침될 때 과정요소에 유의한 영향을 미칠 것으로 예상한다. 본 연구의 결과는 중소기업들이 연구모형을 활용하여 기술경영 상의 제약을 효율적으로 극복하고, 보다 높은 기술혁신 성과를 달성하는데 도움이 될 것이다. 아울러 정책기관들이 중소기업의 기술혁신 관리요소에 관심을 갖고, 애로요인을 보완해 줌으로써 보다 효과적인 정책지원이 가능할 것이다.

• 한국수학교육학회지시리즈D:수학교육연구
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• 제19권1호
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• pp.19-41
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• 2015

Previous studies indicated that students tended to hold less satisfactory beliefs about the discipline of mathematics, beliefs about themselves as learners of mathematics, and beliefs about mathematics teaching and learning. However, only a few studies had developed curricular interventions to change students' beliefs. This study aimed to examine the effect of a problem-solving curriculum (i.e., Mathematical Problem Solving for Everyone, MProSE) on Singaporean Grade 7 students' beliefs about mathematical problem solving (MPS). Four classes (n =142) were engaged in ten lessons with each comprising four stages: understand the problem, devise a plan, carry out the plan, and look back. Heuristics and metacognitive control were emphasized during students' problem solving activities. Results indicated that the MProSE curriculum enabled some students to develop more satisfactory beliefs about MPS. Further path analysis showed that students' attitudes towards the MProSE curriculum are important predictors for their beliefs.

• 기술경영경제학회:학술대회논문집
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• 기술경영경제학회 1998년도 제13회 하계학술발표회 논문집
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• pp.57-90
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• 1998

This study attempts to explore the evolution paths of Korean SMEs'strategies and their technological teaming processes. Several different evolution paths are identified based on a dynamic strategic group analysis of 115 SMEs'strategy in the Korean electronic component industry for the period of 1990-1995. Further, inadept case analyses on technological learning processes in 5 firms are undertaken. Major findings of this study can be summarized as follows : 1) There are three dominant evolution paths in SMEs'strategy. First path indicates the evolution from a subcontractor or petty imitator group(a strategic group with the narrow product/market domain and the low level of accumulated resource/capabilities) into an innovator group(a strategic group with the narrow domain but high level of technological capability) by accumulating technological capabilities. Second, some firms move from a subcontractor group into a generalizer group(a strategic group with broad product/market domain but relatively low level of technological capability) by simply adding product lines. Third path involves firms which evolve from a subcontractor group into a production focus group(a strategic group with high level of production capability) by investing in production capabilities. 2) An in-depth case analysis shows those who succeeded in technological learning are managed by CEOs, who have technological expertise and strategic vision, and have made an effort to establish management practices to support innovation, such employee educational program, performance-based reward system, etc. The successful firms also aggressively pursue diverse external linkages with outside technology sources to learn product and process technologies. Fiendly, this study discusses several implications of the findings for the theoretical development and strategic management of small firms in Korea.

• 한국IT서비스학회지
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• 제18권4호
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• pp.171-190
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• 2019

This study comparatively analyzes the cases of CDMA (Code Division Multiple Access) and WIPI (Wireless Internet Platform for Interoperability) to find out the success and failure factors of technology policies in the field of mobile communication industry. For this purpose, the two cases are analyzed through a new analysis framework, which is made by combining System of Innovation with a range of variables derived from precedent studies, such as external environment, institutions, technological system, governance structure, and interactions of actors. The results of analysis show that in the CDMA case, the following factors led to success ; Korea made good use of the external opportunities in the early stage of digital communication technology and adopted a suitable governance structure for the technological system. Main actors in Innovation System had strong will for success and engaged in cooperative interaction. For the WIPI, however, the timing of technology policy was inappropriate and a unsuitable governance structure for technological system was chosen because of path dependence. The Innovation System failded to respond efficiently to the situation where conflicts among actors had intensified, US trade pressure had increased and innovative smartphones emerged. The results of this study provide the practical implications for the success of technology policy; namely it is important to choose a governance structure that suits the external environment and characteristics of technology and to activate cooperative interactions among actors in Innovation System.

• 산업경영시스템학회지
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• 제20권42호
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• pp.67-72
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• 1997

How to measure technological level has concerned research analysists for a long time. Many methods exist, and they all have their advantages and disadvantages according to how they are used. The purpose of this study is to develop qualitative indicator to measure industrial technological level, in particular manufacturing capacity. In this indicator, the two basis of technology classification and the concept of the technology competitiveness were introduced. First, the types of technology are classified as three classes : material technology, processing technology and product technology. Second, the characteristics of technology are divided into the three categories : core technology, peripheral technology and sprouting technology On this basis, the qualitative technological level was made in terms of the competitiveness of it's manufacturing capacity. This study should be a practical approach for application of measuring of technological level.

• 기술혁신학회지
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• 제8권3호
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• pp.1157-1174
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• 2005

This paper aims at examining the disembodied technological progress in the Korean IT service industry, on the assumption that competition leads to the disembodied technological progress. Hobijn model (2000) which abstracts the disembodied technological progress from the total technological progress and Bai et al. Model (1998, 2003) which identifies time of the technological structural change are used for empirical study. The empirical analysis indicates the major structural change in the pattern of the disembodied technology progress occurred after 1995 in the Korean IT service industry. This means that policies for the introduction of competition system and the industry promotion around 1995 have a positive effect on the development of the Korean IT service industry.

• 산업경영시스템학회지
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• 제18권35호
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• pp.95-106
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• 1995

This study is aimed at development a plan to strengthen the competitiveness in technology of small and medium manufacturing enterprises, which can be assumed mainly by small and medium manufacturing companies, to improve the competitiveness of domestic industry. To remove these obstacles and strengthen the technological competitiveness, internally it is required to change the attitude of management about the development and innovation of technology first. Promotion of favorable atmosphere for the technological development and organized activity to acquire technological information are additional requirements. In conclusion, to survive the competition and to secure national industrial competitiveness, each individual company needs to endeavor for technological innovation and improvement in product quality and productivity.

• The Journal of Asian Finance, Economics and Business
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• 제8권2호
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• pp.329-338
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• 2021

The mobile payment system has not only changed the payment pattern but also has improved the performance of small and medium-sized enterprises (SMEs) and individuals' quality of life by saving their energy, reducing the risk of taking cash, and enabling them to give more time to businesses and do international business. Besides, with the current advancement in the Internet as well as the digital transformation, SMEs are being forced to adopt mobile payment systems (MPS). The purpose of this study is to investigate the effects of technological-organizational-environmental (TOE) determinants on the adoption of MPS and its impact on SMEs' firm performance operating in Ghana. This research employed a closed-ended questionnaire to collect data from January 2020 - April 2020. This study used a structural equation modeling (SEM) approach using SmartPLS 3.0 for path analysis of 145 responses. The findings of the study include the statistically significant effects of technological (relative advantage and compatibility), organizational (top management support and employees' readiness), and environmental (social influence and competitive pressure) factors on the adoption of MPS. Furthermore, this study also proved the positive and statistically significant effect of MPS on SMEs' performance. This study demonstrated that the TOE factor explains 70% variations in the adoption of MPS.