• Steel and Composite Structures
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• 제46권2호
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• pp.279-292
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• 2023

Structural design against the progressive collapse has been a vital necessity for decades due to occasional tragic events. The question of whether designed structures against the progressive collapse are still robust if subjected to multi-hazard scenarios containing column removal and successive localized fires is ad-dressed in the current study. Two seven-story steel structures with an identical area but different structural configurations of 4- and 5-bays are designed against the progressive collapse; the structural components are also fireproofed for a 60 min fire resistance. The structures are then subjected to different column re-moval scenarios over different stories followed immediately by localized fires. Results indicate that the structures are not able to keep their stability under all of the considered scenarios; the 4-bay structure is more vulnerable than the 5-bay structure. It is also indicated that upper stories are more sensitive toward the considered scenarios than lower stories. To advance structural safety, two strategies are adopted: in-creasing the thickness of the insulation materials to reduce the thermal effects, or, increasing the safety fac-tor (ΩN) of the structures when designing against the progressive collapse. As for the first strategy, provid-ing a 35% and a 25% increase in the insulation thicknesses of the structural components of the 4-bay and 5-bay structures, respectively, can prevent a progressive collapse to trigger. As for the second strategy, in-creasing ΩN by 10% can enhance the structural integrity to where no collapse occurs under all of the sce-narios.

• 한국산학기술학회논문지
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• 제11권8호
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• pp.2876-2881
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• 2010

본 논문은 한국 및 독일 보험회사의 해외 진출 모델을 비교 연구한다. 특히, 독일 법률비용보험회사의 한국진출 사례를 분석하여 국내 보험회사의 해외진출에 주는 시사점을 제시한다. 연구방법론으로서 한국 및 독일 보험회사의 해외 진출사례를 수집하여 비교 분석한다. 이를 위하여 각 보험회사의 해외진출 담당자와 면담, 이메일, 전화상담 방법을 사용한다. 그리고 문헌연구를 통하여 연구의 이론적 배경과 기존의 연구결과를 분석한다. 본 연구에서는 보험회사 해외진출의 이론적인 배경으로서 고객지향 현지화전략, 신규특화시장 개척전략, 성장시장 진출전략 3개 요인으로 구분한다. 국내 보험회사는 해외 성장시장 진출 측면에서 긍정적인 반면에 현지화전략과 해외 신규 특화시장 개척 부분에서 아직 개선될 부분이 있는 것으로 분석되었다. 독일 보험회사는 한국 시장에 진출하면서 철저한 현지화전략, 특화시장 개척, 성장시장 진출의 3개 부분에서 모두 긍정적인 것으로 분석되었다. 보험회사 해외진출의 이론적 배경 3개 요인을 적용하여 비교 분석한 결과 독일 보험회사의 사례와 같이 한국 보험 회사가 해외에 진출할 경우에 보다 철저한 현지화 전략과 특화시장 개척 전략이 필요하다는 점을 제시한다. 본 연구의 한계점은 독일 법률비용보험회사 1개사를 대상으로 하고 있다는 점이며, 진출 초기라서 아직 경영실적이 뒷받침 되지 않고 있다는 점이다. 향후 연구과제로서 일정시점이 지난 후에 국내 보험시장에서 독일 법률비용보험회사의 발전추이를 분석하고 법률보험시장에서 도덕적 위태 방지 연구, 소비자 보호를 강화할 수 있는 방안 연구를 향후 연구 과제로 제시한다.

• 한국항공운항학회지
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• 제14권2호
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• pp.71-78
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• 2006

In this paper, it is described on the exportation trend and future development paradigm of the localized small aircraft which was recently developed four seated canard type aircraft for exportation purpose. Presently, even though the development of small aircraft is recessed, if we start development of the proper airplane models by integrating domestic power of industry-university-institute on the base of research experience from now on, we can go into the global market and take up the level of world top 10 makers without doubt. For successful operation of exportation system of small aircraft, it is needed to set up development strategy paradigm by forming consortium centering around the medium and small enterprises.

• Structural Engineering and Mechanics
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• 제54권2호
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• pp.239-256
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• 2015

An adaptive-scale damage detection strategy based on a wavelet finite element model (WFEM) for thin plate structures is established in this study. Equations of motion and corresponding lifting schemes for thin plate structures are derived with the tensor products of cubic Hermite multi-wavelets as the elemental interpolation functions. Sub-element damages are localized by using of the change ratio of modal strain energy. Subsequently, such damages are adaptively quantified by a damage quantification equation deduced from differential equations of plate structure motion. WFEM scales vary spatially and change dynamically according to actual needs. Numerical examples clearly demonstrate that the proposed strategy can progressively locate and quantify plate damages. The strategy can operate efficiently in terms of the degrees-of-freedom in WFEM and sensors in the vibration test.

• 대한토목학회논문집
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• 제33권4호
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• pp.1651-1664
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• 2013

도로포장의 파손과정에는 다양하고 복합적인 원인에서 비롯되는 불확실성이 포함되어 있어 정확한 해석이 쉽지 않다. 이로 인해 최근에는 결정론적 모형보다는 확률이론이 보다 많이 활용되고 있으나, 파손의 전체적 특성만을 설명하는 일반적인 분석방안으로는 포장파손특성의 변화과정에 대해 구체적인 정보를 제공하기 어렵다. 이에 본 연구에서는 포장파손과정을 상태와 시간기준으로 분해함으로써 지역적으로 이질성을 띄는 포장파손속도와 그 분산에 대해 구체적으로 파악하고자 하였다. 또한, 분해된 확률과정을 다시 조합하는 과정을 통해 포장의 기대수명과 불확실성을 예측해 보았다. 실증분석을 위해 일반국도포장관리시스템에서 2003년부터 2010년까지 수집된 균열률 자료를 활용하였다. 이러한 시도들은 자산관리의 주요기법 중 하나인 생애주기비용분석의 신뢰성을 높일 수 있으며, 파손속도의 변화과정에 대한 이해가 필수적인 예방적 유지보수전략에 관한 기반연구로써도 중요한 의의가 있다.

• 디지털융복합연구
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• 제10권10호
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• pp.155-163
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• 2012

본 연구의 목적은 현재 한국 광고의 메시지 전략 및 트랜드를 분석하기 위해 실시되었다. 본 연구 목적을 실행하기 위해서 한국 주요 3사 방송국 (KBS, MBC, SBS)의 주요 시간대 (저녁 7시-9시)의 광고를 내용분석 하였다. 내용분석 결과 한국 방송 광고의 주요 내용은 직접적인 메시지가 간접적인 메시지보다 많았고, 제품과 광고 메시지의 관계가 높았다. 더불어 브랜드 광고 빈도가 높았으며, 유머가 적게 나타났고, 회사의 명성을 중요시하는 광고가 많았다. 본 연구의 결과는 글로벌 기업들에게 한국시장의 프로모션에 관련된 지역화 전략을 수립하는데 유용할 것으로 판단된다.

• 동아시아경상학회지
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• 제9권1호
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• pp.53-61
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• 2021

Purpose - This study aims to understand the phenomenon called "regional multinational" in the geographical expansion of multinational enterprises and to find some evidence whether globalization of multinational enterprises tends to have a strong home region bias. Research design, data, and methodology - Through an in-depth case analysis, we analyze the series of strategic behaviors Wal-Mart made in South Korea from its entry in 1998 to its withdrawal in 2006. Then, we discuss the plausible causes of this exit, seeking to provide some evidence on the "regional multinational" phenomenon. Result - This study finds some evidence on the regional-based expansion of multinational enterprises. Our case study shows that Wal-Mart in South Korea focused on global standardization strategy and made an exit from the market as they were faced with increasing localization demands. From the perspective of multinational enterprises' globalization strategy, Wal-Mart's exit from the South Korean market can be considered as a strategic exit. Conclusion - The findings of this study suggest that while national responsiveness and localized adaptation are considered as a panacea for penetrating international markets, in reality most multinational enterprises attempt to add value primarily by capitalizing on similarities across markets and remain as regional multinationals.

• 동아시아경상학회지
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• 제7권4호
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• pp.27-40
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• 2019

Purpose - This study aims to analyze PASECO's environment and strategies during its advance into the Middle East to find out the success factors of the kerosene heater market and provide strategic implications for small and medium enterprises' growth based on these factors. Research design and methodology - This study analyzes the success factors of companies operating in the Middle East. As a case analysis study, the method of research analyzes case enterprises through existing literature, newspaper articles, and corporate interview materials. Results - PASECO's success was shown by its high technological power in kerosene heater products, understanding customers' needs, understanding the Middle East market and localization strategy. Conclusions - PASECO has been constantly developing R&D capability to secure competitive products and has released localized products to enhance the satisfaction of its customers in the Middle East and has also been successful by constantly creating new opportunities. The firm's success strategies provide implications for small and medium-sized businesses for greater growth.

• Smart Structures and Systems
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• 제14권2호
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• pp.209-224
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• 2014

With more and more built long-term structural health monitoring (SHM) systems, it has been considered to apply monitored data to learn the reliability of bridges. In this paper, based on a long-term SHM system, especially in which the sensors were embedded from the beginning of the construction of the bridge, a method to calculate the localized reliability around an embedded sensor is recommended and implemented. In the reliability analysis, the probability distribution of loading can be the statistics of stress transferred from the monitored strain which covered the effects of both the live and dead loads directly, and it means that the mean value and deviation of loads are fully derived from the monitored data. The probability distribution of resistance may be the statistics of strength of the material of the bridge accordingly. With five years' monitored strains, the localized reliabilities around the monitoring sensors of a bridge were computed by the method. Further, the monitored stresses are classified into two time segments in one year period to count the loading probability distribution according to the local climate conditions, which helps us to learn the reliability in different time segments and their evolvement trends. The results show that reliabilities and their evolvement trends in different parts of the bridge are different though they are all reliable yet. The method recommended in this paper is feasible to learn the localized reliabilities revealed from monitored data of a long-term SHM system of bridges, which would help bridge engineers and managers to decide a bridge inspection or maintenance strategy.

• Nuclear Engineering and Technology
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• 제56권10호
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• pp.4018-4030
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• 2024

The in-vessel retention through external reactor vessel cooling (IVR-ERVC) strategy is a key management strategy for early termination of a nuclear severe accident that can threaten the integrity of the reactor vessel. To simulate the physical phenomena of the molten corium, the smoothed particle hydrodynamic (SPH) method is utilized in this study. The SPH method is a Lagrangian computational fluid dynamic (CFD) method that can simulate multi-fluid stratification, turbulence, natural circulation, radiative heat transfer, thermal ablation, and crust formation. To address the external vessel cooling, it is coupled with a conventional 1-D nuclear system analysis method. The 1-D system analysis code can calculate the two-phase natural circulation of cooling water and the convective heat transfer on the external reactor vessel wall. These two simulation codes exchange the temperature and heat flux of the reactor vessel outer wall. This study numerically simulated the IVR-ERVC strategy for a Korean high-power reactor and compared it with the traditional lumped parameter method (LPM). Unlike LPM, this study provides localized detailed data about the thermal hydraulic behavior of molten corium and visualization of phenomena in the IVR-ERVC strategy. This enhances our understanding of the phenomena in IVR-ERVC strategy and introduces new perspectives.