• KSII Transactions on Internet and Information Systems (TIIS)
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• 제14권10호
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• pp.3989-4006
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• 2020

The intelligent agriculture monitoring is based on the perception and analysis of environmental data, which enables the monitoring of the production environment and the control of environmental regulation equipment. As the scale of the application continues to expand, a large amount of data will be generated from the perception layer and uploaded to the cloud service, which will bring challenges of insufficient bandwidth and processing capacity. A fog-based offline and real-time hybrid data analysis architecture was proposed in this paper, which combines offline and real-time analysis to enable real-time data processing on resource-constrained IoT devices. Furthermore, we propose a data process-ing algorithm based on the incremental principal component analysis, which can achieve data dimensionality reduction and update of principal components. We also introduce the concept of Squared Prediction Error (SPE) value and realize the abnormal detection of data through the combination of SPE value and data fusion algorithm. To ensure the accuracy and effectiveness of the algorithm, we design a regular-SPE hybrid model update strategy, which enables the principal component to be updated on demand when data anomalies are found. In addition, this strategy can significantly reduce resource consumption growth due to the data analysis architectures. Practical datasets-based simulations have confirmed that the proposed algorithm can perform data fusion and exception processing in real-time on resource-constrained devices; Our model update strategy can reduce the overall system resource consumption while ensuring the accuracy of the algorithm.

• 복식
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• 제60권2호
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• pp.51-67
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• 2010

The purpose of this study was to develop the high value-added cultural product design with local cultural resources, and to contribute to promoting cultural tourism festivals. To accomplish this study, first, a preliminary survey is carried out the investigation of cultural product stores and visitors' questionnaire survey. Next, based on these survey and prior study, this study established the development direction and concept of fashion cultural products and to developed fashion cultural products using local cultural resources. Adobe Photoshop 6.0, and Adobe Illustrator CS Program were used for the standardization of patterns, textile design and illustration. The results of this study were as follows; First, based on preliminary research results, the problems of the design of cultural tourism festival products were derived. As one solution to solve this problem, this study established the development direction and concept of fashion cultural products to develop fashion cultural products. The concept of the Andong Maskdance Festival was 'Tribal-Holic'; the Boryeong Mud Festival, 'Get away form it all'; the Gangjin Celadon Festival, 'Timeless Memories'; the Jinju Namgang Yudeung Festival, 'Lighting up the River'; the Chungju World Martial Arts Festival, 'Next Ergonomics Gym'; and the Muju Firefly Festival, 'Eco-Purity'. Second, based on the desired items of festival organizers and the survey of visitor's preference for cultural products, 4 items were selected by festival type. Then a total of 96 designs of 4 kinds each were developed using logos or characters, traditional patterns, special products, symbolizing region, or festival as a motif. Third, the strategy for development of cultural products design for promotion of cultural tourism festivals were 'Place identity design strategy', 'Market oriented design strategy', 'Buyer-Based pricing strategy', 'Regional brand strategy', and 'Distribution networks expansion strategy'.

• 한국자동차공학회논문집
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• 제23권1호
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• pp.56-64
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• 2015

This study presents a model-based gain scheduling strategy for PI-based EGR controllers. The air-to-fuel ratio is used as an indirect measurement of the EGR rate. In order to cope with the nonlinearity and parameter varying characteristics of the EGR system, we proposed a static gain model of the EGR system using a new scheduling parameter. With the 810 steady-state measurements, the static gain model achieved 0.94 of R-squared value. Based on the static gain of the EGR system, the PI gains were robustly designed using quantitative feedback theory. Consequently, the gains of the PI controller are scheduled according to the static gain parameter of the EGR path in runtime. The proposed model-based gain scheduling strategy was validated through various operating conditions of engine experiments such as setpoint step responses and disturbance rejections.

• 통상정보연구
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• 제16권5호
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• pp.151-178
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• 2014

리히텐슈타인의 글로벌 전동공구 기업 Hilti는 유럽의 미소국에서 작은 가족기업으로 출발하여 태생적인 입지적 약점을 극복하고, 현재 120여 개국에 진출한 건설장비 및 공구산업에서 글로벌 기업으로 자리매김한 하나의 성공사례이다. 또한 Hilti의 글로벌 시장성공은 국제경쟁력 결정요인으로서 요소조건과 수요조건 등 일국의 내생적 조건의 중요성을 설명하는 Porter의 diamond 이론에 배치되는 하나의 사례로 평가될 수 있다. 즉, Hilti의 글로벌 시장 성공사례는 누가 무엇을 얼마나 가지고 출발하느냐가 아니라 주어진 환경조건에서 자신의 역량을 얼마나 효율적으로 활용하느냐에 따라 기업은 타고난 내생적 한계를 극복하고 경쟁적 지위를 확보하는데 더 중요하다는 사실을 확인시켜주고 있다. 본 사례연구에서는 Hilti의 글로벌 경쟁력 및 성공요인을 기업특유자산과 전략특유자산 관점에서 분석하고, 시장성공 요인을 고품질의 제품개발역량, 조직 혁신성, 고객지향에 입각한 마케팅전략 그리고 글로벌화 전략 등으로 제시하였다. Hilti의 글로벌 성공에서 한국 제조 중소기업들에게 제시될 수 있는 시사점은 무엇보다 기업의 혁신 노력과 고객지향에 기반 한 명확한 비즈니스 전략과 전략의 구현이라고 할 수 있다.

• 한국콘텐츠학회논문지
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• 제18권9호
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• pp.1-13
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• 2018

공유가치창출은 기업의 수익과 경쟁중심적 전략에서 벗어나 기업의 활동이 사회적 가치에 연결될 수 있도록 방향을 전환하는 경영전략이다. 본 연구는 이러한 기업의 공유가치창출활동에 대한 소비자의 인식이 어떠하며 이러한 기업활동에 참여하고자 하는 의도는 어떠한지를 분석하였다. 본 연구의 결과는 다음과 같다. 첫째, 공유가치창출전략의 실천가능성에 대해 소비자들은 전반적으로 긍정적인 인식을 가지고 있는 것으로 나타났다. 둘째, 소비자의 실천가능성인식, 혜택인지가 소비자의 공유가치창출활동 참여의도에 미치는 영향을 살펴보기 위하여 구조방정식모형으로 분석한 결과, 공유가치창출활동의 실천가능성에 대한 긍정적 인식은 기업혜택인지의 수준을 높이고 이것이 다시 소비자혜택으로 이어지는 매개효과가 직접효과에 비해 더 큰 영향력을 가지는 것으로 나타났다. 또한 기업혜택과 소비자혜택에 대한 인지수준이 소비자의 참여의도에 미치는 영향을 구체적으로 살펴본 결과, 기업측면에서의 실용적인 성과를 높게 인지할 때, 그리고 이러한 기업혜택이 소비자혜택으로 연결된다고 여겨질 때 참여의도가 높아지는 것으로 나타났다.

• 한국산학기술학회논문지
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• 제15권4호
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• pp.1923-1931
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• 2014

시장에서 공급자와 고객의 가치창출은 학계와 산업계에서 중요한 비즈니스 전략으로 인식되고 있지만 이 현상에 대한 체계화된 연구가 부족하다. 본 연구에서는 해외 저널 및 국내 저널을 포함한 기존의 문헌에 대한 탐색적 연구 및 귀납적 추리를 바탕으로 가치연구의 발전 동향을 시기별, 주제별로 정리하였고 공급자와 고객의 가치창출 현상의 연구를 위한 자원 및 역량 기반 연구체계를 구축하였다. 가치 연구의 연구동향에 대해 주제별로 살펴본 결과 2004년 이전에는 크게 제품 및 서비스의 가치에 대한 연구와 고객과의 관계가치에 대한 연구로 나눌 수 있었고 2004년 이후 각각은 서비스 지배적 논리 및 관계의 효용, 네트워크 및 공급자 체인상의 관계로 발전하였다. 자원과 역량 기반 관점에서 기존의 문헌들을 연구한 결과 4가지의 자원(재무적 자원, 지식 자원, 효율성 자원, 지적 재산 자원)과 4가지의 역량(관계 역량, 협력 역량, 혁신 역량, 관리 역량)을 도출하였고 이를 기반으로 한 연구체계를 수립하였다.

• 한국시스템다이내믹스연구
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• 제15권2호
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• pp.97-131
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• 2014

The purpose of this study is to analyze Foreign Exchange(FX) exposure and FX hedge strategy based on the systems thinking perspective using causal loop diagrams. FX exposure has been a critical issue on a business management. Many studies in Korea have researches on variables which make effects to the company value. This study displays causal loop diagrams(CLDs) on these issues. In order to make CLD more objective, most causalities are articulated from recent 72 studies (1998~2013) of domestic top journals. This approach is valuable in that it is the first try to draw all the causalities from various literature review regarding FX exposure and FX hedge strategy. This study is expected to make a useful and basic material to research the financial issues of corporate, as the first research to dynamically understand FX exposure and FX hedge strategy.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회 2005년도 추계학술대회 및 정기총회
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• pp.27-37
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• 2005

The rectilinear Steiner tree problem (RSTP) is to find a minimum-length rectilinear interconnection of a set of terminals in the plane. It is well known that the solution to this problem will be the minimal spanning tree (MST) on some set Steiner points. The RSTP is known to be NP-complete. The RSTP has received a lot of attention in the literature and heuristic and optimal algorithms have been proposed, A key performance measure of the algorithm for the RSTP is the reduction rate that is achieved by the difference between the objective value of the RSTP and that of the MST without Steiner points. A hybrid evolution strategy on RSTP based upon the Prim algorithm was presented. The computational results show that the evolution strategy is better than the previously proposed other heuristic. The average reduction rate of solutions from the evolution strategy is about 11%, which is almost similar to that of optimal solutions.

• Journal of Power Electronics
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• 제13권3호
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• pp.479-486
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• 2013

This paper presents a control strategy for distributed systems, which can be used in islanded microgrids. The control strategy is based on the droop method, which uses locally measured feedback to achieve load current sharing. Instead of the traditional droop method, an improved one is implemented. A virtual inductor in the synchronous frame for three-phase inverters is proposed to deal with the coupling of the frequency and the amplitude related to the active and reactive power. Compared with the traditional virtual inductor, the proposed virtual inductor is not affected by high frequency noises because it avoids differential calculations. A model is given for the distributed generation system, which is beneficial for the design of the droop coefficients and the value of the virtual inductor. The effectiveness of the proposed control strategy is verified by simulation and experiment results.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회 2007년도 추계학술대회 및 정기총회
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• pp.488-492
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• 2007

In this study, we investigated how to distinguish customer delivered value to re-purchasing in fierce B2C industry. To identify key managerial variables that could distinctively impact re-purchasing, we first identified customer value proposition as per the customer buying decision process. Next, core value propositions of choice efficiency and competitive price are defined to determine vendor satisfaction during the searching stage and purchasing stage. The trust level is also introduced in the sense of reflecting confirmation to guarantee after purchase security. Then, significant managerial variables to impact on core value propositions are extracted. The resulting structural model illustrated that search convenience and quality assurance affect the choice efficiency, and re-purchase intention is strongly explained by both the vendor satisfaction and trust level. The empirical testing results also support that transaction cost reduction is key determinant of shopping at the Internet shopping mall. Furthermore, trust level should be combined to induce re-purchasing in addition to transaction cost savings.