• 한국강구조학회 논문집
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• 제26권4호
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• pp.299-309
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• 2014

HSA800은 건축구조용 고성능 강재로서 KS규격에 항복강도 650MPa-770MPa, 인장강도 800MPa-950MPa를 가지며 항복비(항복강도/인장강도) 또한 0.85이하로 제한되어있으며 TMCP 기법으로 제조되어 뛰어난 용접성을 나타내는 특징이 있다. 본 연구에서는 국내 최초의 초고층 빌딩인 롯데월드타워의 메가 구조부재를 대상으로 고강도 강재 적용시 구조물 안전성의 변동사항 및 시공성 개선 등을 검토하여 경제적 설계를 위한 대안을 제시하는 것을 목적으로 한다. 대상 부재로는 아웃리거 코어월 매립부 상/하현재, 벨트트러스, 외곽 철골기둥이 선정되었다. 원설계 단면을 등가 도강도 강재 단면으로 환산하여 두께를 결정한 후 중력저항모델, 횡력저항모델, 연쇄붕괴 모델을 구조해 석시뮬레이션을 통하여 성능을 비교 평가하였다. 그 결과 횡강성에 영향을 주지 않는 부재는 고강도 강재 적용이 가능하며 원설계 대비 약 1100톤의 물량 절감 효과가 있었다. 따라서, 고강도 강재를 사용하면 부재 두께를 줄일 수 있으므로 부재 제작성 및 시공성이 향상될 수 있을 것으로 기대된다.

• 한국안전학회지
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• 제20권4호
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• pp.162-170
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• 2005

The effective development of event product for a successful event is first started with figuring out the participation motive of event. Second, what level of expectation before participating event for participant will have. Third, what level of satisfaction and safety satisfaction based on figured out motive and expectation will participant have. Fourth, what level of revisit based on satisfaction will have. The study is needed for these low items. Therefore, this investigation started as an exploratory study for a successful event to analysis the relationship among expectation satisfaction, safety satisfaction and revisit. The results indicated that participated motive is positively influenced on expectation. The expectation is positively influenced on safety satisfaction. The satisfaction is positively influenced on revisit. Finally, the safety satisfaction is positively influenced on revisit. The unique characteristics of this study is considered a safety satisfaction as m event safety and as an important factor when terror becomes often these days.

• 감성과학
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• 제9권spc3호
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• pp.287-297
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• 2006

인간은 보다 풍요로운 삶을 살고자 하는 욕구와 최근 소비문화의 변화는 대형 할인매장이라는 소비시장의 생성을 가능케 하였고, 이는 할인매장에서 소비자의 사용 편의에 대한 욕구가 더욱 증가하게 되었다. 이러한 대형 할인매장에서 쇼핑방법은 소비자에게 많은 정신적, 육체적 어려움을 주고 있다. 이에 현재 대형 할인매장에서의 문제점을 해결할 수 있는 쇼핑 지원 로봇을 개발, 상용화 시켜 사용자의 원활한 생활 지원을 목적으로 하는 로봇의 디자인 개발을 위한 기초 연구이다. 본 연구에서는 소비자의 쇼핑 지원시 필요한 사용자의 행태 분석과 설문조사를 통해, 쇼핑 지원 로봇의 니즈를 분석 도출하여 쇼핑 지원 로봇의 디자인 개발 시 형태 디자인을 위한 가이드라인을 제안했다.

• 복식문화연구
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• 제12권5호
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• pp.792-804
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• 2004

Sportism is continuously expressed in every season in a different theme and established as a Mega-Trend of the early 21 th century fashion. This study was conducted to research the social and cultural sources of the sportism expressed in the early 21th century fashion. This study focused on hybrid as one of the post-modem phenomena. By analysing social and cultural sources of the sportism, three aspects were found; first, many different fashion trends are coincides in post-modem society, which is possible and accelerated by hybrid each other. Second, the complicated and competitive society urge the people to review the past and the originality. Third, youth-oriented and individualistic lifestyle was brought by the development of the technology and economic surplus. Hybrid of the TPO was analysed which made the sportism mega-trend. 'Formal wear was mixed with casual wear, casual wear with active sportswear, hi-fashion with street fashion, and hi-fashion influenced formal and casual wear again'. The sportism prevalent in 21th century fashion can be explained by this system of hybrid. Results of the analysis in this study can be categorized into four aesthetic values based on hybrid of the styles, which are glamorous sportism, romantic sportism, minimal sportism, and heritage sportism.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2009년도 세계 도시지반공학 심포지엄
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• pp.554-563
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• 2009

The trend of current urban redevelopment and new city development project shows that the superstructure of building is getting larger and higher in consequence of a limited plottage condition. For this reason, it is definitely required to extend pile diameter and install more deep foundation(Mega foundation) to support superstructure. The existing precast pile construction method causes construction-related problems such as increasing quantities, difficulty of storage & transportation material and decreasing design load while construct pile in deep foundation. The drilled shaft method has applied to minimize those problems. This article will be presented construction case study of design & construction of R.C.D method for a large building foundation work on the inside and outside of the country.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2009년도 춘계 학술논문 발표대회 학계
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• pp.119-122
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• 2009

As architectures have recently become high-risers and mega-structured, stable high strength products have been ensured. Accordingly, use of precast concrete accouplement has been increased in order to facilitate air compression and rationalize construction. Since not only external heating but a1so internal temperature rise caused by the accumulation of cement hydration heat in manufacturing process, precast concrete members with large cross-section used for high-rise mega-structure's columns and beams may exhibit different temperature history compared to the precast concrete members for wall and sub-floor with relatively small cross-sections. Therefore, this study aims to elucidate the characteristics of temperature history of mass concrete members cast with high-strength concrete fur precast concrete application. In this study, large cross-sectional precast concrete mock-up, unit cement quantity, and temperature histories in manufacturing precast concrete member under different curing condition were inclusively investigated.

• 해양환경안전학회:학술대회논문집
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• 해양환경안전학회 2004년도 춘계학술발표회
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• pp.99-105
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• 2004

• 한국콘텐츠학회논문지
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• 제13권3호
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• pp.511-519
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• 2013

이 논문은 유럽 교과서에 기술된 '서울'을 분석하여 오늘날 서울이 유럽 교과서에 어떻게 투영되어 있는지 살펴보는 것이 목적이다. 이 연구에서는 유럽 주요국인 영국, 프랑스, 스페인, 이탈리아, 독일 교과서에 기술된 '서울'이 어떤 방식으로 서술되고 있는지 서술경향을 살펴본다. 유럽 교과서에서 서울은 거대도시 중의 하나로 도시문제를 가지고 있는 공간이며 경제중심지로서 다른 대도시들 간의 상호 교류를 담당하고 있는 도시로 소개된다. 이와 함께 서울은 다른 대도시들과 비교했을 때 상대적으로 경쟁력이 낮은 도시로 평가받고 있으며 서울이 보유한 역사 및 문화 자원에 대해서는 주목받고 있지 않다. 그러나 여기서 살펴본 유럽 교과서 중 서울 관련 서술에서 오류가 극히 드물다는 점은 긍정적이다. 앞으로 교과서 서술에서 한국의 경제적 측면뿐만 아니라 역사 및 문화에 대한 서술이 증대되어 교과서가 한국을 알릴 수 있는 신뢰할 수 있는 콘텐츠가 되기를 기대한다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.649-652
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• 2005

The camera cellular phone has a large portion of cellular phone market in recent year. The variety of a customer demand makes a fast model change and the spatial resolution is changed from VGA to multi-mega pixel. The 1.3 mega pixel (MP) camera cellular phone was first released into the Korean market in October 2003. The major cellular phone companies released a 2MP camera cellular phone that supports zoom function and a 2MP camera cellular phone is settled down with the Korea cellular phone market. It makes a keen competition in price and demands automation for phone camera module. There is an increasing requirement for the automatic assembly to correspond to a fast model change. The hard automation techniques that rely on dedicated manufacturing system are too inflexible to meet this requirement. Therefore in this study, this system is designed with the flexibility concept in order to cope with phone camera module change. The system has a same platform that has X-Y-Z motion or X-Z motion with ${\mu}m$order accuracy. It has a special gripper according to the type of a component to be put together. If the camera model changes, the gripper may be updated to fit for the camera module. The controller of this system acquires the data sets that have the information about the assembly part by the tray. This information is obtained ahead of an inspection step. The controller excludes an inferior part to be assembled by using this information to diminish the inferior goods. The assembly jig used in this system has a function of self adjustment that reduces the tact time and also diminish the inferior goods. Finally, the intelligent assembly system for phone camera module will be designed to get a flexibility to meet model change and a high productivity with a high reliability.

• Earthquakes and Structures
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• 제19권5호
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• pp.347-359
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• 2020

The Mega-Sub Controlled Structure System (MSCSS), an innovative vibration passive control system for building structures, is improved by adding lead rubber bearings (LRBs) on top of the substructure. For the new system, a genetic algorithm is used to optimize the dynamic parameters and distributions of dampers and LRBs. The program uses various seismic performance indicators as optimization objectives, and corresponding results are compared. It is found that the optimization procedure for maximizing the energy dissipation ratio yields the best solutions, and optimized models have consistent seismic performances under different earthquakes. Seismic performances of optimized MSCSS models with and without LRBs, as well as the traditional Mega-Sub Structure model, are evaluated and compared under El Centro wave, Taft wave and 20 other artificial waves. In both elastic and plastic analysis, the model with LRBs shows significantly smaller story drift and horizontal acceleration than those of the other two models, and fewer plastic hinges are developed during severe earthquakes. Energy analysis also shows that LRBs installed in proper locations increase the deformation and energy dissipation of dampers, thereby significantly reduce the kinetic, potential, and hysteretic energy in the structure. However, LRBs do not have to be mounted on all the additional columns. It is also demonstrated that LRBs at unfavorable locations can decrease the energy dissipation for dampers. After LRBs are installed, the optimal damping coefficient and the optimal damping exponent of dampers are reduced to produce the best damping effect.