• 전기학회논문지
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• 제57권4호
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• pp.560-566
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• 2008

Today, as the power trades between generation companies and power customer are liberalized, the uncertainty level of operated power system is rapidly increased. Therefore, transmission operators as decision makers for transmission expansion are required to establish a deliberate investment plan for effective operations of transmission facilities considering forecasted conditions of power system. This paper proposes the methodology for the optimal solution of transmission expansion in deregulated power system. The paper obtains the expected value of transmission congestion cost for various scenarios by using occurrence probability. In addition, the paper assumes that increasing rates of loads are the probability distribution and indicates the location of expanded transmission line, the time for transmission expansion with the minimum cost for the future by performing the Montecarlo simulation. To minimize the investment risk as the variance of the congestion cost, Mean-Variance Markowitz portfolio theory is applied to the optimization model by the penalty factor of the variance. By the case study, the optimal solution for transmission expansion plan considering the feature of market participants is obtained.

• 국제지역연구
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• 제13권3호
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• pp.385-412
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• 2009

본 연구는 일본기업의 해외진출 결정요인 및 영향력 분석에 있어 투자국인 일본 및 일본기업의 경제적 환경 변화(요인)을 선행적으로 분석한다. 최근 일본기업의 해외진출의 특징은 과거 "노동집약적 산업"이라는 점과 "사양 산업"의 해외투자라는 전통적인 형태를 유지하고 있다. 또한 중소 제조업의 경우 "비용 절약형"이라는, 그리고 대기업은 "시장 확보형"의 투자요인이 상대적으로 중요했다. 반면에 비제조업 대기업의 특징은 "전문가 확보 및 시장 관련형"이, 그리고 중소 비제조업 경우 "사회자본의 정비와 수준"이 해외진출에 주요한 요인으로 작용한다. 한편 1990-96년과 1998-2006년까지 일본기업의 해외진출에 관한 요인분석의 결과, 공통적으로 적용되는 요인은 엔환율, 금리, 임금, 기업이익, 설비투자, 소비지출이었다. 특히 회귀분석의 결과, 1990-96년에는 "저금리"의 급변이 일본기업의 해외진출에 주요하게 작용했고, 1998-2006년에는 일본의 "엔환율"이 중요한 요인으로 추출되었다. 즉, 1990-96년까지 엔화가치의 폭등에 따른 충격은 1998-2006년에 이르러 서서히 일본경제 내부에 체화 및 완충되었고 볼 수 있다. 반면에 1998-2006년에는 엔화가치의 상승 요인과 더불어 일본정부의 해외지원정책과 "저금리"하에서 일본기업의 해외진출은 가속화되었다고 말할 수 있다.

• World Technopolis Review
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• 제8권1호
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• pp.21-42
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• 2019

The purpose of this research was to investigate the factors influencing global expansion/scalability of Kenyan Small and Medium Enterprises (SMEs). Factor analysis and multiple/multivariate regression analysis to determine the functional relationship between independent variables (factors) and the dependent variable was used. The independent variables were: innovation & technology, fitness/appropriateness of management, global marketing strategy; and support environment and the dependent variable, global expansion/scalability. Data was collected from a survey of randomly selected firms of 205, drawn from a population of 440 firms from Kenya Manufacturers Directory, with 175 firms responding. The key findings from the research in relation to Kenyan SMEs were that: there is a functional relationship between global market strategy and global expansion; there is a functional relationship between innovation and technology orientation and global expansion, there is no significant functional relationship between supportive environment of firms and their global expansion; and there is no significant functional relationship between fitness/appropriateness of management and global expansion/scalability. The implications for practice is that the ranking of the factors in order of priority supports focusing concern on the orientation of business strategy toward global market strategy, market research geared at obtaining foreign market intelligence, innovation and technology, product adaptation, service orientation, collaborative ventures, and long-range vision as key factors in making Kenyan firms successful in the international market. The implication for policy and practice is that there is need for collaboration between industry and government in pursuing policies for global expansion/scalability and among SMEs and large enterprises particularly in areas of rapid technological change.

• Design & Manufacturing
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• 제8권2호
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• pp.30-36
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• 2014

In this study, surface deformation patterns have been investigated by the rigid-plastic finite element method for friction factor test in solid cylinder compression process. AA1100 and AA6063 aluminum alloys, which show different work hardening characteristics respectively, have been adopted as model materials used for analysis. The main objective of this study is to provide the deformation mechanics in detail in solid cylinder compression process, especially at the die/workpiece interface that is closely related with the frictional conditions. For this reason, solid cylinder compression process has been numerically analyzed. The surface flow patterns at the contact boundary have been analyzed in terms of surface expansion, surface expansion velocity, pressure distributions exerted on the die surface along the die surface. By defining bulge factor, barreling phenomenon also have been examined with calibration curves to verify their effects on the surface flow pattern that is important for evaluating the frictional condition at the interface.

• 한국진공학회지
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• 제14권2호
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• pp.59-68
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• 2005

부피가 다른 세 개의 진공용기를 조합하여 정적법 (static expansion method)을 이용한 중진공영역의 국가표준기를 개발하였다. 이 장치를 이용하여 133pa 범위의 용량형 진공게이지 (capacitance diaphragm gauge)를 교정하여 국제표준화기구의 측정불확도 표현지침에 따라 분석하였다. 그 결과 표준압력 0.553Pa에서의 확장불확도 (expanded uncertainty)가 95% 신뢰수준 (confidence level), 포함인자 (coverage factor) k=2에서 $2.628\times10^{-3}Pa$로 우수한 성능을 보였다.

• 한국정보시스템학회:학술대회논문집
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• 한국정보시스템학회 2001년도 추계학술대회 발표논문집:차세대 전상거래 시대의 비즈니스전략
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• pp.438-450
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• 2001

This study is to classify the typology of e-business model based on the practical strategic model for successful e-business implementation. For that purpose, we review the conceptual framework of e-business and collected the data from 127 companies implementing e-business. The study is conducted in three phases as follows. First, six factors consisted of 22 items are derived through factor analysis. Second, Cluster analysis is employed to group the firms into different strategic patterns. A five-cluster solution is found to maximize the distances between cluster means across the six factor patterns. The models are named as 'ascendancy and convergence', 'expansion and moderate price', 'expansion and improvement of quality', 'ascendancy and process', and 'improvement of quality' respectively. Third, ANOVA is used to examine the impact on the performance differences attributable to the models. The results of the study are; (1) the 'ascendancy and process', 'expansion and improvement of quality' and 'expansion and moderate price' models were associated with significantly higher performance levels than the 'improvement of quality' model, and (2) the hybrid strategies are needed to implement e-business successfully based on the 'ascendancy and process' model.

• 한국전기전자재료학회논문지
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• 제34권5호
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• pp.337-341
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• 2021

Phase evolution, thermal and microwave dielectric properties of cordierite-Al₂O₃ composite were investigated. As the content of Al₂O₃ increased, mullite, sapphirine, and spinel were formed as secondary phases, implying that cordierite may be decomposed by the reaction with Al₂O₃. All sintered specimens exhibited dense microstructures. The densification occurred through liquid phase sintering. As the content of Al₂O₃ increased, the thermal expansion coefficient and the dielectric constant increased, whereas the quality factor decreased. The thermal expansion coefficient, the dielectric constant, and the quality factor of the 90 wt% cordierite 10 wt% Al₂O₃ composite sintered at 1,425℃ were 2.9×10^-6 K^-1, 5.1, and 34,844 GHz, respectively.

• 한국화재소방학회논문지
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• 제22권5호
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• pp.83-89
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• 2008

ISO 7203-2의 고팽창포 표준 발포기를 이용하여 포수용액을 5기압에서 6리터로 방사하면서 풍량, 스크린 매쉬, 포수용액의 농도 및 소금물의 농도 등 외적 요인에 의한 발포 특성을 살펴보았다. 연구결과 풍량이 증가할수록 발포배율이 증가하는 경향을 보였으며 표준발포용 스크린이 평직 철망에 비해 발포배율이 높았다. 포수용액의 농도 증가에 따라 발포 배율과 환원시간이 긴 안정성이 좋은 포를 발생하였으며 소금물의 농도가 증가하는 경우는 발포 배율과 환원시간 모두 감소하는 경향을 나타내었다.

• 국제지역연구
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• 제22권1호
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• pp.101-121
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• 2018

본 논문은 중국내 다국적 기업 R&D 랩의 진출동기가 경영성과에 미치는 영향, 진출동기와 경영성과의 관계에서 통제수준의 매개효과에 대하여 검증하였다. 문헌연구에 대한 고찰을 거쳐, 다국적 기업 R&D 랩의 진출 동기는 크게 4가지로 드러났다. 첫째, 중국의 시장과 고객을 확보하기 위한 목적으로 시장요인이라 명명하였으며, 둘째, 중국의 훌륭한 기술이나 인적자원을 획득하기 위한 목적으로 자원요인이라 명명하였다. 셋째, 정부의 혜택, 관련 정책, 인센티브 조항 등 제도적 이점을 바라고 진출하는 경우인데 이를 제도요인이라 명명하였고 마지막으로 중국을 전략적 요지로 보고 중국 시장에서 경쟁자와 경쟁하기 위한 목적으로 진출한 경우인데 이를 전략요인이라 명명하였다. R&D 랩에 대한 기업의 통제수준은 각 사안별로 측정하였다. 진출동기와 통제수준의 관계를 실증분석해본 결과, 시장요인, 제도요인, 전략요인을 추구하는 기업들은 목표의 특성상 현지성을 많이 추구해야 하므로 높은 통제보다는 자율권을 부여하는 것이 바람직 한 것으로 드러났다. 진출동기와 경영성과의 관계에서 통제수준의 매개효과를 살펴본 결과, 자원요인을 추구하여 진출한 R&D 랩은 현지에서 획득한 훌륭한 기술자원을 잘 활용하기 위하여 본사의 통제가 필요로 하며, 전략요인을 추구하는 기업 역시 본사의 통제력이 강할수록 경영성과가 높아 경쟁에서 유리한 것으로 나타났다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2001년도 봄 학술발표회 논문집
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• pp.215-222
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• 2001

Uncertainty study of shear strength characteristics of the marine clays was carried out based ell In-situ tests and laboratory tests on tile south-east coastal region of the Korean peninsula. Theoretical analyses were studied using both tile spherical cavity expansion theory in finite soil mass and the strain path method to determine tile cone factor using the undrained shear strengths obtained by in-situ tests, and the empirical methods in accordance with the ultimate resistance theory were also discussed. Analysis show that the empirical methods suggest more reasonable value than that of theoretical methods in terms of comparing the cone factor estimated using linear regression and frequency distribution analyses. The cone factors obtained by the empirical methods are 18, 15, and 6 respectively, from the results of total cone resistance, effective cone resistance, and excess porewater cone resistance method, and the estimated were similar to those of previous researcher's.