• 시스템엔지니어링학술지
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• 제15권2호
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• pp.79-86
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• 2019

Among the government-sponsored projects supported by Ministry of SMEs and Startups(MSS), the financial support of the Consulting Research Institutes of our university is scheduled to be ended this year. In this regard, this study is to develop a profit model for R&D center of Consulting Research Institute that can cultivate the financial independence of R&D center of Consulting Research Institutes and foster technology convergence consulting manpower to strengthen the competitiveness of SMEs in preparation for the Fourth Industrial Revolution. The profit model were derived from the current status of consulting industry and similar organizations, the current status of consulting graduate R&D centers, case studies of other universities, and focus group interviews. In order to select three high profit models and commercialize them, BMC (Biz Model Canvas) was used and business feasibility was examined. Therefore, three profit model of R&D center of Consulting Research Institute are: First, SCB (SME's Consulting Business: Total Solution Provider for SMEs through Technology Convergence Consulting), Second, SNB (SME's Network Business: Experts connection in Consulting Graduate School for Solving Problems and Problems of SMEs / Industry Consolidation) And third, SM (Sustainable Management: Financial independence through structural improvement of Consulting Research Institute), and the road-map was established. As an implementation plan, the company intends to seek financial independence by developing a profit model for R&D center of Consulting Research Institutes and by establishing business goals and strategies, manpower operation plan, organization, and investment plan for three years.

• Smart Structures and Systems
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• 제20권3호
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• pp.385-396
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• 2017

The recent advancements in sensing technologies allow us to record measurements from target structures at multiple locations and with relatively high spatial resolution. Such measurements can be used to develop data-driven methodologies for condition assessment, control, and health monitoring of target structures. One of the state-of-the-art technologies, Fiber Optic Strain Sensors (FOSS), is developed at NASA Armstrong Flight Research Center, and is based on Fiber Bragg Grating (FBG) sensors. These strain sensors are accurate, lightweight, and can provide almost continuous strain-field measurements along the length of the fiber. The strain measurements can then be used for real-time shape-sensing and operational load-estimation of complex structural systems. While several works have demonstrated the successful implementation of FOSS on large-scale real-life aerospace structures (i.e., airplane wings), there is paucity of studies in the literature that have investigated the potential of extending the application of FOSS into civil structures (e.g., tall buildings, bridges, etc.). This work assesses the feasibility of using FOSS to predict operational loads (e.g., wind loads) on chain-like structures. A thorough investigation is performed using analytical, computational, and experimental models of a 4-story steel building test specimen, developed at the University of Southern California. This study provides guidelines on the implementation of the FOSS technology on building-like structures, addresses the associated technical challenges, and suggests potential modifications to a load-estimation algorithm, to achieve a robust methodology for predicting operational loads using strain-field measurements.

• Safety and Health at Work
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• 제8권3호
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• pp.237-245
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• 2017

Background: Solar furnaces are used worldwide to conduct experiments to demonstrate the feasibility of solar-chemical processes with the aid of concentrated sunlight, or to qualify high temperature-resistant components. In recent years, high-flux solar simulators (HFSSs) based on short-arc xenon lamps are more frequently used. The emitted spectrum is very similar to natural sunlight but with dangerous portions of ultraviolet light as well. Due to special benefits of solar simulators the increase of construction activity for HFSS can be observed worldwide. Hence, it is quite important to protect employees against serious injuries caused by ultraviolet radiation (UVR) in a range of 100 nm to 400 nm. Methods: The UV measurements were made at the German Aerospace Center (DLR), Cologne and Paul-Scherrer-Institute (PSI), Switzerland, during normal operations of the HFSS, with a high-precision UV-A/B radiometer using different experiment setups at different power levels. Thus, the measurement results represent UV emissions which are typical when operating a HFSS. Therefore, the biological effects on people exposed to UVR was investigated systematically to identify the existing hazard potential. Results: It should be noted that the permissible workplace exposure limits for UV emissions significantly exceeded after a few seconds. One critical value was strongly exceeded by a factor of 770. Conclusion: The prevention of emissions must first and foremost be carried out by structural measures. Furthermore, unambiguous protocols have to be defined and compliance must be monitored. For short-term activities in the hazard area, measures for the protection of eyes and skin must be taken.

• Smart Structures and Systems
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• 제22권5호
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• pp.575-586
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• 2018

Computational Building Information Modeling (BIM) is an intelligent 3D model-based process that provides architecture, engineering, and construction professionals the insight to plan, design, construct, and manage buildings and infrastructure more efficiently. This paper aims at using BIM in Hospitals configurations protection. Infrastructure projects are classified as huge structural projects taking advantage of many resources such as finance, materials, human labor, facilities and time. Immense expenses in infrastructure programs should be allocated to estimating the expected results of these arrangements in domestic economy. Hence, the significance of feasibility studies is inevitable in project construction, in this way the necessity in promoting the strategies and using global contemporary technologies in the process of construction maintenance cannot be neglected. This paper aims at using the building information modeling in covering Imam Khomeini Hospital's equipment. First, the relationship between hospital constructions maintenance and repairing, using the building information modeling, is demonstrated. Then, using library studies, the effective factors of constructions' repairing and maintenance were collected. Finally, the possibilities of adding these factors in Revit software, as one of the most applicable software within BIM is investigated and have been identified in some items, where either this software can enter or the software for supporting the repairing and maintenance phase lacks them. The results clearly indicated that the required graphical factors in construction information modeling can be identified and applied successfully.

• 한국건설순환자원학회논문집
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• 제6권3호
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• pp.69-78
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• 2011

최근 콘크리트제품에 대한 고급화, 고품질화 및 고강도화 등의 추구로 변화함에 따라 구조물의 미적효과와 전시 목적의 제품 고급화를 위해 반투명 콘크리트를 제작하였다. 본 연구에서는 반투명 콘크리트의 제조기법 개발을 통해 다양한 형상의 블록 제조방식을 소개하고, 또한 반투명 콘크리트의 물성 평가와 더불어 경제적인 반투명 콘크리트 제조를 위해 무기혼화재인 고로슬래그와 플라이애시의 활용 및 유리알갱이의 적용방안에 대해 검토하였다. 물성평가 결과, 반투명 콘크리트 블록의 28일 압축강도는 32.2MPa이고 탄성계수와 푸아송비는 일반 콘크리트 블록에 비해 증가되어 압축을 받는 부재일 경우 일반 콘크리트 구조물과 같이 구조적 용도로도 사용이 가능하다는 것을 알 수 있었다. 시멘트 대체재로써 플라이애시 적용하였을 때 동일 양의 광섬유를 포함한 반투명 콘크리트 블록의 28일 강도의 85~96%의 값을 보였으며, 고로슬래그 미분말을 적용하였을 때에는 82~96%의 값을 보였다. 또한, 광섬유대체재로서 유리알갱이를 적용한 결과, 빛의 투과효과가 전혀 나타나지 않아 대체효과가 전혀 없는 것으로 나타났다.

• 한국자동차공학회논문집
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• 제18권5호
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• pp.45-49
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• 2010

The automotive industry has shown a growing interest in tube hydroforming during the past years. The advantages of hydroforming (less thinning, a more efficient manufacturing process, etc.) can, for instance, be combined with the high strength of extra high strength steels, which are usually less formable, to produce structural automotive components which exhibit lower weight and improved service performance. Design and production of tubular components require knowledge about tube material and forming behavior during hydroforming and how the hydroforming operation itself should be controlled. These issues are studied analytically in the present paper. In this study, the whole process of rear sub-frame parts development by tube hydroforming using AA6061 material is presented. At the part design stage, it requires feasibility study and process design aided by CAE (Computer Aided Engineering) to confirm hydroformability in details. Effects of parameters such as internal pressure, axial feeding and geometry shape in automotive rear sub-frame by hydroforming process were carefully investigated. Overall possibility of hydroformable rear sub-frame parts could be examined by cross sectional analyses. Moreover, it is essential to ensure the formability of tube material on every forming step such as pre-bending and hydroforming. In addition, all the components of prototyping tool are designed and interference with press is examined from the point of geometry and thinning.

• Smart Structures and Systems
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• 제4권3호
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• pp.343-365
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• 2008

In this study, the frequency domain method which utilizes the evaluation of changes in the structural mode shape is adopted to identify regions which contain localized damages. Frequency response function (FRF) values corresponding to the modal frequency, analogous to the mode shape coefficients, are used since change in natural frequency of the system is usually insignificant for localized damage. This method requires only few sensors to obtain the dynamic response of the structure at specific locations to determine the FRF via fast-Fourier transform (FFT). Numerical examples of an aluminum plate, which includes damages of varying severity, locations and combinations of multiple locations, are presented to demonstrate the feasibility of the method. An experimental verification of the method is also done using an aluminum plate with two different degrees of damage, namely a half-through notch and a through notch. The inconsistency in attaining the FRF values for practical applications due to varying impact load may be overcome via statistical averaging, although large variations in the loading in terms of the contact duration should still be avoided. Nonetheless, this method needs special attention when the damages induce notable changes in the modal frequency, such as when the damages are of high severity or cover more extensive area or near the boundary where the support condition is modified. This is largely due to the significant decrease in the frequency term compared to the increase in the vibration amplitude. For practical reasons such as the use of limited number of sensors and to facilitate automation, extending the resolution of this method of identification may not be efficient. Hence, methods based on wave propagation can be employed as a complement on the isolated region to provide an accurate localization as well as to trace the geometry of the damage.

• 한국산학기술학회논문지
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• 제19권5호
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• pp.160-166
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• 2018

본 연구에서는 주행하는 도로면의 단면 형상 정보를 이용하는 RPS 시스템과 다원형 감쇠 특성을 가지는 MSD 시스템을 기반으로 예견 제어 알고리즘을 적용한 지능형 현가 시스템을 제안하고, 그 결과를 제시하였다. 자동차의 과도한 진동과 조종 불안정성을 유발하는 대표적인 외란 입력은 주행하는 도로면에 돌출되거나 함몰된 불규칙한 주행 장애물이다. 이러한 장애물의 존재 유무만이 아니라 그 형상에 대한 정보를 안다면 이를 활용하여 제어 성능을 개선시킬 수 있다. 선행 연구 결과를 바탕으로 하여, 상용성을 고려한 구조화된 작동 시스템을 적용한 응용 연구를 수행하였다. 이를 위해 RPS 시스템과 예견 제어 기법을 기반으로 한 제어 알고리즘과 다차원화된 감쇠 특성을 가지는 MSD 시스템 간의 스위칭 알고리즘을 개발, 연계성을 제시하였다. 실차 적용성을 파악하기 위하여, 제안된 제어 프레임을 전차량 모델에 구현하여 시뮬레이션을 수행하였다. 구조적 간결성을 목표로 적용된 3-DS 작동기 시스템과 결합된 전자제어식 현가 시스템을 통하여 탑승자의 승차감과 차체의 조종 안정성을 효과적으로 개선할 수 있음과 제 시스템의 유용성을 확인하였다.

• 한국산학기술학회논문지
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• 제19권1호
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• pp.587-595
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• 2018

세계에서는 지구온난화 등에 따른 기후 변화에 대응하여 원전 건설을 금지해오던 국가들도 점점 허용하는 추세이다. 따라서 앞으로의 원전 건설이 늘어날 것이며 이에 대한 경쟁 또한 심화될 것이다. 원전 프로젝트는 일반 건설 공사와 비교하여 공사 기간이 매우 길다. 원전 건설 프로젝트에서 경쟁 우위를 확보하기 위해 원전 공사 기간을 줄일 수 있는 기술을 개발하는 것이 필요하다. 따라서 본 연구의 목적은 원자로 건물 외벽 거푸집의 높이를 3m에서 4m로 증가시킴으로써 공사 기간을 감소시키기 위한 원자로 건물 외벽 거푸집을 개발하는 것이다. 개발된 거푸집을 원전 프로젝트에 적용하기 위해 구조적 안전성과 시공성 및 경제성을 분석하였다. 현장 적용 가능성을 평가한 결과 개발된 거푸집은 구조적으로 안전했다. 그리고 시공 단수가 감소함으로써 공사 기간이 단축되고 공사비 또한 절감되는 효과를 확인하였다. 본 연구의 결과는 향후 원자로 건물의 공사 기간 단축을 위한 지속적인 기술 개발을 위한 자료로 활용하여 한국의 세계 원전시장에서의 경쟁력 확보에 기여할 수 있을 것으로 사료된다.

• 산경연구논집
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• 제11권6호
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• pp.41-53
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• 2020

Purpose: The purpose of this study is to review the previous studies on the characteristics of the image search service provided by using artificial intelligence, the social impact characteristics, and the moderating effect of perceived anthropomorphism, and conduct empirical analysis to identify the constituent factors affecting purchase intention. To clarify. Through this, I tried to present theoretical and practical implications. Research design, data, and methodology: Research design was that characteristics of image search service (ubiquity and information quality) and social impact characteristics (subjective norms, electronic word of mouth marketing) are affected by mediation of satisfaction and flow, therefore, control of perceived anthropomorphism have an effect on purchase intention to increase. For analysis, research conducted literature review, and developed questionnaires, so that EM firm which is a specialized research institute has collected data. This was conducted on 410 people between the 20s and 50s who have mobile shopping experiences. SPSS Statistics 23 and AMOS 23 had been used to perform necessary analysis such as exploratory factor analysis, reliability analysis, feasibility analysis, and structural equation modeling based on this data. Results: first, ubiquity, information quality and subjective norms were found to have a positive effect on purchase intention through satisfaction and flow parameters. Second, satisfaction and flow were found to have a mediating effect between ubiquity, information quality, and subjective norms and purchase intentions. However, there was no mediating effect between eWOM information and purchase intention. Third, perceived anthropomorphism was found to have a moderating effect between information quality and satisfaction, and it was found that there was no moderating effect on the relationship between information quality and flow. Conclusions: The information quality of image search services using artificial intelligence has a positive effect on satisfaction, and it has been found that there is a positive moderate effect of perceived anthropomorphism in this relationship, which may be an academic contribution to the distribution science utilizing artificial intelligence. Therefore, it is possible to propose a distribution strategy that improves purchase intention by utilizing image search service and anthropomorphism in practical business and providing a more enjoyable immersive experience to customers.