Showing papers by "Dong-Soo Kim published in 2015"
TL;DR: In this article, the authors evaluated the effect of soil-foundation interaction on the earthquake response of structures using an in-flight earthquake simulator and found that the lateral forces of the structures were limited by the soil-bearing strength and the damping effect owing to the rocking motion of the foundation.
Abstract: To evaluate the effect of soil-foundation interaction on the earthquake response of structures, centrifuge tests were performed using an in-flight earthquake simulator. The test specimen was composed of a single-degree-of-freedom structure model, a shallow foundation, and subsoil deposits in a centrifuge container. The test parameters were the dynamic period of the structure model, the centrifugal acceleration level, and the type and level of input earthquake accelerations. The test results showed that the lateral forces of the structures were limited by the soil-bearing strength (i.e., ultimate moment capacity of the foundation) and the damping effect owing to the rocking motion of the foundation. Thus, even when the periods of the structures were close to the site periods, the lateral forces did not significantly increase. However, it should be noted that, because of the damping effect of the foundation, the maximum seismic lateral load of the structures exceeded the load statically determined b...
28 citations
TL;DR: In this article, the performance of group anchors was investigated in silty sand and subjected to horizontal pullout loading, and the efficiency of the anchors was defined as the ratio of the pullout resistance of a group anchor to that of a single anchor multiplied by the number of the unit anchors.
21 citations
TL;DR: In this paper, the authors examined the seismic responses of an inverted T-type wall using three-dimensional numerical analyses of a time domain with explicit time integration and verified the numerical analysis model using dynamic centrifuge tests at a prototype scale.
18 citations
07 Apr 2015
TL;DR: In this paper, body sensors are integrated by leveraging RESTful web service via CoAP over IPv6, enabling web-based access from browsers, and Extended EPCglobal architecture was used for the system to enable sharing of sensor data among applications with different domain through the standardized protocol.
Abstract: The revolutionary improvements in low power devices and lightweight network protocols are making the mobile healthcare engage attentions. However there are some obstacles to realize mobile healthcare. Connectivity of miniaturized wearable sensors of the body area network (BAN) to the Internet is one of the most important issues in realizing mobile healthcare system. Interoperability is also important in order for sensor data not to be isolated in a local system. In this paper, we designed our mobile healthcare system resolving connectivity and interoperability issues. In our mobile healthcare system, body sensors are integrated by leveraging RESTful web service via CoAP over IPv6, enabling web-based access from browsers. Extended EPCglobal architecture was used for our system to enable sharing of sensor data among applications with different domain through the standardized protocol. We developed two applications, patient browser and EagleEye, to prove its feasibility.
8 citations
TL;DR: Cheomseongdae is known to be the oldest astronomical observatory in Asia as mentioned in this paper, and features such as the filler of the lower half, inner irregular-shaped stones which can induce high frictional resistance, eight long horizontal tie stones inside the artefact, and a grid of interlocking headstones increase its resistance to horizontal dynamic loads.
Abstract: Summary
Cheomseongdae is known to be the oldest astronomical observatory in Asia. According to historical records, the Gyeongju area, where Cheomseongdae is located, suffered from numerous medium-scale earthquakes. Cheomseongdae has a masonry structure, which is apparently vulnerable to horizontal dynamic loads such as earthquakes. However, despite its appearance, features such as the filler of the lower half, inner irregular-shaped stones which can induce high frictional resistance, eight long horizontal tie stones inside the artefact, and a grid of interlocking headstones increase its resistance to horizontal dynamic loads. Dynamic centrifuge model tests were performed on Cheomseongdae in order to evaluate the seismic response characteristics of this architectural heritage structure. Model tests were executed on two 1/15-scale models: one which was an exact duplicate of the original Cheomseongdae and the other without the long horizontal tie stones and grid of interlocking headstones. On the basis of the amplification patterns in the time and frequency domains, the differences in seismic behaviour between the two Cheomseongdae models, and a broken stone at the 19th layer during tests, the long horizontal tie stones and headstones were found to increase the seismic resistance within Cheomseongdae and provide a glimpse of the ‘seismic design’ of our ancestors. Copyright © 2014 John Wiley & Sons, Ltd.
5 citations
10 Jun 2015
5 citations
TL;DR: In this paper, a large-scale model testing site was constructed to show the feasibility of a surface wave method based on harmonic wavelet analysis of waves (HWAW) for evaluating the lateral variation of the shear wave velocity (V S ) profile.
1 citations
01 Jan 2015
1 citations
10 Jul 2015
TL;DR: In this article, a numerical model was first verified against dynamic centrifuge tests results performed on an underground subway tunnel and then, the effect of underground structure on peak ground acceleration (PGA) at the ground surface investigated considering linear and nonlinear behavior for the soil.
Abstract: In this paper, a numerical model was first verified against dynamic centrifuge tests results performed on an underground subway tunnel and then, the effect of underground structure on peak ground acceleration (PGA) at the ground surface investigated considering linear and nonlinear behavior for the soil. The results show that in the range of natural frequency of the system, nonlinear model shows deamplification of PGA with respected to the freefield. Whereas, linear model shows opposite trend. Out of the range of natural frequency of the system, linear and nonlinear models predict same results and * : م يكينورتكلا تسپ ،تابتاكم لوئس : rabeti@iust.ac.ir
30 Jun 2015
TL;DR: In this article, the authors proposed a method to solve the problem of the lack of resources in the South Korean market by using the concept of "hybridization" of the Korean language.
Abstract: 규사모래지반에 대하여 동적원심모형 시험과 3차원 시간영역 양해법을 적용한 수치해석을 이용하여 단자유도 얕은 기초 구조물의 지진시 지지력 평가를 수행하였다. 수치해석은 동적원심모형 시험의 원형스케일로 시행되었다. 수치해석결과는 실험 계측결과와 매우 일치하는 해석결과를 나타내었다. 본 논문에서는 검증된 수치해석결과로 부터 기초면 하 접지압을 획득하여 지진시...