• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.7 no.6
• /
• pp.1106-1115
• /
• 2006

In this paper, the transmission characteristics and equivalent circuit model of microstrip transmission line having defected ground structure (DGS) in multilayer substrates are described fur high frequency region. In order to perform the study, the second dielectric layer is attached additionally onto the bottom(ground) plane of the basic DGS microstrip line consisted of the microstrip line and DGS. The dielectric constant and thickness of the second dielectric layer are adjusted to get various transmission characteristics and model parameters, and to analysis the effect of the second dielectric layer ultimately. According to this paper, the effect and equivalent circuits due to the attached dielectric substrate are verified separately, and this is expected to be applied to high frequency circuit design in the future.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
• /
• 2010.10a
• /
• pp.396-401
• /
• 2010

건축기술의 발달과 함께 건물은 높아지고 있지만 건물의 높이가 높아질수록 각종 재난으로부터 안전의 확보가 어려워지는 것이 현실이다. 특히 전 세계적으로 기후가 급격하게 변화하고, 재난의 유형도 다양화, 복합화 되고 있으며, 사회구조의 변화로 인해 재해로 인한 재난이 대형화되고 있는 추세이다. 특히 초고층복합빌딩은 재난이 일어나면 복합적으로 대형화된 재난이 일어날 가능성이 매우 높다. 이러한 시점에서 초고층복합빌딩에서 재난사고에 대응하기 위하여 각종 재난별로 일어날 수 있는 사고시나리오를 제시하고 앞으로 초고층복합빌딩의 재난사고에 대한 대응 방향을 제시하고자 한다.

• Journal of the Korean GEO-environmental Society
• /
• v.19 no.11
• /
• pp.31-37
• /
• 2018

Most of tall building systems are composed of above-ground structure and underground structure used for parking and stores. The underground structure may have a pronounced influence on tall building response, but its influence is still not well understood. In a widely referred report on seismic design of tall buildings, it is recommended to model the underground structure ignoring the surrounding ground and to impose input ground motion calculated considering the underground structure-soil kinematic interaction between at its base. In this study, dynamic analyses are performed on 1B and 5B basements. The motions at the base are calculated to free field responses. The motions are further compared to two procedures outlined in the report to account for the kinematic interaction. It is shown that one of the procedure fits well for the 1B model, whereas both procedures provide poor fit with 5B model analysis result.

• Korean Journal of Construction Engineering and Management
• /
• v.17 no.2
• /
• pp.90-98
• /
• 2016

High-rise buildings construction project have various risk factors. Major risk factors are negative results such as time delay and increase of costs. Therefore, this study was analyzed risk factors in construction stages of high-rise buildings using by PROMETHEE technique. For this, this research were identified risk factors through experts Focus Group Interview(FGI). And, PROMETHEE was used to setup evaluation standard for analysis of high-rise building construction risks. Next, the standard of evaluation index calculation was composed by using the definition level in PDRI. Preference function and evaluation index were identified through questionnaires. Through these processes, this study has calculated the importance of high-rise building construction risks using by PROMETHEE technique. As a result, high degree risk factors were as following. These are 'Operation plan of material lifting', 'Outrigger & Belt Truss Construction', 'Foundation work plan of high-rise building' and 'Considering a Structure concept of high-rise building'.

• Journal of Korean Tunnelling and Underground Space Association
• /
• v.20 no.4
• /
• pp.671-686
• /
• 2018

Recently, earthquakes have occurred near Gyeongju and Pohang and the social demands are thus being increased for seismic analysis of tall buildings and their adjacent underground structure in big cities. Since most of the previous seismic analysis studies considered a tall building and an adjacent underground structure separately, however, they lack the analysis on dynamic mutual behavior between two structures. Therefore, in this study, a dynamic analysis with a full soil-structure interaction was performed for a complex underground facility with a tall building and an adjacent underground structure constructed on the bedrock with a surface layer. To improve the reliability, in particular, a pseudo-static analysis was performed and compared with the dynamic analysis results. It is comprehensively concluded that the analysis of adjacent underground structures being considered is more conservative than that of not considered.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2008.11a
• /
• pp.325-328
• /
• 2008

Recently increasing interest in high-rise building around the world for more than 100 floor, the trend is the increasing use of high-strength and high-flowable concrete so as of productivity improvements and cost savings to improve the performance of the early strength development. This study is to reach the optimal combination by reviewing the performance of high-rise building which is required. The results, lower the ratio of W/B was an increase in compressive strength and early strength in the use of admixture decreased in the combination of higher replacement ratio of admixture.

• Proceedings of the Computational Structural Engineering Institute Conference
• /
• 2010.04a
• /
• pp.289-292
• /
• 2010

본 연구에서는 기둥이 제거되는 경우 선형정적해석법을 사용하여 부재력을 산정하고 확률 신경망을 이용하여 그 분포를 파악하였다. 1층 내부기둥이 제거될 경우 다른 부재의 부재력이 가장 큰 것으로 나타났다. 확룰신경망을 이용하여 부재력의 분포를 파악하고 추정하는 것은 연쇄붕괴 시 초고층 건물이나 비정형 건물에 대한 위험부재를 선정하고 파악하는데 시간과 노력을 경감할 수 있는 것으로 나타났다.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2015.11a
• /
• pp.89-90
• /
• 2015

Recently, Incidence of natural disasters are growing gradually. The need for a monitoring system for maintaining the structural integrity of the high-rise buildings against extreme weather events such as typhoons, earthquakes is increasing gradually. One of the most important features in the tall building is to guarantee structural safety during the structure's life time. Structural monitoring technologies might be needed to manage structural safety and to protect human life.

• 건축구조
• /
• v.13 no.3
• /
• pp.70-71
• /
• 2006

• 건축구조
• /
• v.13 no.3
• /
• pp.74-75
• /
• 2006