• Proceedings of the KIPE Conference
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• 2017.07a
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• pp.413-414
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• 2017

영구자석 동기전동기 구동 인버터 시스템 내 스위치 고장은 다양한 조합으로 발생한다. 특히 스위치 개방고장의 경우 다른 전기 부품에 과전류를 유발하여 전체 시스템에 심각한 2차 손상을 초래한다. 본 논문에서는 개방고장 진단 알고리즘의 복잡성을 완화하기 위해 고장 그룹을 분류하여 고장 발생 시 false alarm의 영향을 받지 않고 간단하고 체계적인 방식으로 고장을 식별할 수 있는 기법을 제안한다. 스위치의 개방 고장으로 영구자석 동기전동기 구동 시스템 내 PWM 전압원 인버터의 신뢰성을 향상시키기 위해 3중 스위치 개방고장 진단 및 검출 기법을 제시한다. 제안된 기법은 기존의 개방고장 진단방법과 달리 정보처리를 위해 Moving Filter를 사용함으로써 연산부하를 증가시키지 않고 신속한 고장 검출이 가능하며 별도의 하드웨어 구성없이 구현이 가능하다. 제안된 기법의 안정성과 유효성이 시뮬레이션을 통해 입증된다.

• Journal of Intelligence and Information Systems
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• v.15 no.2
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• pp.15-31
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• 2009

The next generation IT environment is expected to be an open computing environment based on Grid computing technologies, which allow users to access to any type of computing resources through networks. The open computing environment has benefits in aspects of resource utilization, collaboration, flexibility and cost reduction. Due to the variation in performance of open computing resources, however, resource allocation simply based on users' budget and time constraints often fails to meet the Service Level Agreement(SLA). This paper proposes the Mean-Absolute Deviation(MAD) portfolio optimization approach, in which service brokers consider the uncertainty of performance of resources, and compose resource portfolios that minimize the uncertainty. In order to investigate the effect of this approach, we simulate an open computing environment with varying uncertainty levels, users' constraints, and brokers' optimization strategies. The simulation result concludes threefolds. First, the MAD portfolio optimization improves the success ratio of delivering the required performance to users. Second, the success ratio depends on the accuracy in predicting the variability of performance. Thirdly, the measured variability can also help service brokers expand their service to cost-critical users by discounting the access cost of open computing resources.

• Korea Real Estate Review
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• v.27 no.1
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• pp.17-32
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• 2017

The openness of residential space directly affecting lighting, view, and ventilation leads to the variation of open floor plan type in apartment construction project. This study intends to substantiate the effect to the apartment price by design property of open floor plan based on actual design information of apartment and price. The open floor plan type and associated design property, and actual transaction price of apartment have been considered as variables for analysis by the hedonic price function model and artificial neural networks model. Research findings indicate that the openness affects the price of apartment positively and the three sides open plan is the most preferred with the highest price. This study aims to provide the implication to the developer in planning and design stage of apartment and the purchaser seeking the suitable price by floor plan design.

• Proceedings of the KAIS Fall Conference
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• 2012.05a
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• pp.315-318
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• 2012

본 논문에서는 유아를 위한 가정연계 다문화 교육활동을 계획하고 적용함으로써 유아와 어머니의 다문화 인식에 미치는 영향에 대해 알아보는 것에 목적을 두고 있다. 분석 결과 첫째, 가정연계 다문화 교육활동이 유아의 다문화 인식 전체와 하위 요인인 문화 개방성, 문화 수용성, 문화 존중성에 긍정적인 영향을 미치는 것으로 나타났다. 둘째 가정연계 다문화 교육활동은 어머니의 다문화 인식 전체와 하위 요소인 문화 수용성, 문화 존중성에 긍정적인 영향을 미쳤고, 문화 개방성에는 영향을 미치지 않았다. 셋째, 가정연계 다문화 교육활동에 참여한 유아들의 다양한 표현 결과물과 교사 관찰일지, 교사저널 등을 분석한 결과 유아들의 다문화 관련 인식에 긍정적인 변화가 있었으며, 문화 개방성, 문화수용성, 문화 존중성에도 효과가 있었다. 즉, 가정과 연계한 다문화 교육활동은 유아의 다문화 인식과 어머니의 다문화 인식 중 문화 수용성과 문화 존중성에 긍정적인 영향을 미친다는 것을 알 수 있다.

• Journal of Labour Economics
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• v.29 no.1
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• pp.1-39
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• 2006

This paper documents the increase in earnings variability (or earnings risk) during the 1990s in Korea, and investigates whether it can be accounted for by capital market opening. The variances of transitory and permanent innovations in earnings are estimated from repeated cross-section data using a simple econometric framework. The increasing time-series pattern of earnings risk among men follows the increased foreign capital presence reasonably well, but the supporting cross-sectional evidence for a causal relationship between the two is weak. However, foreign direct investment (FDI) is found to have had some non-neutral effects on workers of varying skills in such a way that transitory earnings risk of less-skilled workers relatively increased with FDI. To the extent that transitory innovations are not fully insured, this widening effect of FDI on earnings risk gap may have contributed to widening welfare gap between skilled and unskilled workers in Korea, at least in terms of "risks."

• Polymer(Korea)
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• v.25 no.5
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• pp.679-690
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• 2001

High resilience PU foams were prepared with polyether type cell opener. The influences of cell opener concentration on the kinetics, rheology, structural stability morphology and open cell content of the obtained foam were investigated and the role of cell opener during cell opening was determined. And mechanical properties as a function of cell opener concentration were studied. It was observed that urea formation reaction was delayed due to high hydrophilicity of cell opener The decrease of viscosity and the increase of tan $\delta$ were confirmed with increasing cell opener concentration so that the resulted foam had low structural stability and high open cell content. The deterioration of matrix and uniform dispersion of hydrogen-bonded urea in matrix with cell opener concentration was revealed by SEM analysis. As a result, elastic properties of the foam matrix were decreased due to high hydrophilicity of cell opener during the preparation of high resilience polyurethane foam and foam with high open cell content resulted. Hardness, tensile strength, tear strength, elongation of foam were decreased with increasing cell opener concentration.

• The korean journal of orthodontics
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• v.39 no.2
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• pp.72-82
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• 2009

Objective: The purpose of this study was to investigate the structural changes of the hyoid bone and upper airway after orthognathic surgery for skeletal class III anterior open bite patients, and make comparisons with normal occlusion. Methods: Pre- and post-operative computed tomography (CT) examinations were performed on 12 skeletal class III anterior open bite patients who were treated with mandibular setback osteotomy. Using the V-works $4.0^{TM}$ program, 3-dimensional images of the total skull, mandible, hyoid bone, and upper airway were evaluated. Results: In the Class III open bite group, the hyoid bone were all positioned anteriorly, compared to the Normal group (p < 0.05). The angle between the hyoid plane and mandibular plane in the Class III openbite group before surgery was greater than in the Normal group (p < 0.05), and the difference increased after surgery (p < 0.01). In the Class III openbite group, the volume of the upper airway decreased after surgery (p < 0.001) and the volume of the upper airway was smaller than the Normal group before and after surgery (p < 0.001). Conclusions: The narrow upper airway space in skeletal Class III openbite patients decreased after mandibular setback osteotomy. This may affect the post-surgical stability.

• Journal of Digital Convergence
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• v.19 no.11
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• pp.235-246
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• 2021

This study analyzed the effects of SMEs' open innovation capabilities and organization capabilities to lead these innovations on corporate performance. For this purpose, an empirical analysis was conducted targeting 250 small and medium-sized enterprises(SMEs) employee. The empirical study results are as follows. Absorptive capability, relational capability, CEO's innovativeness, employee's innovativeness, and decision-making openness had a significant positive (+) effect on the non-financial performance of SMEs. It was analyzed that multiplicative capability did not significantly affect non-financial performance. On the other hand, absorptive capability, relational capability, CEO's innovativeness, and decision-making openness had a significant positive (+) effect on the financial performance of SMEs. It was analyzed that multiplicative capability and employee's innovativeness did not significantly affect financial performance. Decision-making openness and absorptive capability were analyzed as factors that have an most important influence on a company's financial and non-financial performance. Based on these research results, academic and practical implications were presented.

• Proceedings of the Korean Nuclear Society Conference
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• 1998.05b
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• pp.844-850
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• 1998

본 연구에서는 개방구(opening)을 갖는 원자력발전소 강재 격납구조물의 내력을 평가함에 있어서 기존의 실용 구조설계에 적용된 개구부가 없는 원통형 쉘의 좌굴 판정 기준이 적절하지 않음을 밝혔으며, 대안으로서 개방구(opening)를 갖는 원통형 강재 격납구조물의 재료적 비선형과 기하학적 비선형을 고려한 극한 내력 해석을 수행함으로써 중기발생기 교체작업시 유발되는 인양 하중에 대한 격납구조물의 구조적 안전성을 평가하였다. 개방구를 갖는 격납구조물에 대하여 stiffner가 있는 상태에서 크레인 하중에 대한 극한 내력을 평가해본 결과 크레인 하중이 재하될 경우, 구조물이 선형 탄성 범위에 있는 것으로 확인되었으며 개방구 주위의 국부적인 항복응력도달 상태에 대하여 10.8의 안전율을 확보 할 수 있는 것으로 계산되었다. 본 연구를 통하여 제시된 개방구를 갖는 강재 격납구조물의 극한내력 평가 방법은 유사 구조물의 구조건전성 평가에 활용될 수 있을 것으로 사료된다.

• Journal of Digital Convergence
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• v.18 no.10
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• pp.137-146
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• 2020

The purpose of this study is to confirm the moderating effect of the 'IRrelevance Processing'(IRP) on the relationship between decision maker's openness and business problem solving creativity (BPSC). In order to confirm the psychological mechanism of BPSC and openness, we developed the irrelevance processing. In particular, the creativity in this study is different from the general creativity studied in psychology. BPSC is a study with practical value applied in the management environment. The results showed that openness of the decision maker was correlated with the BPSC, and that the irrelevance processing was a psychological mechanism to moderating effects relationship between openness of decision makers and BPSC. This paper proved the correlation between the propensity of decision makers and BPSC, and contributed to the study of corporate creativity by identifying the psychological mechanisms.