This paper suggests the method of the spherical signature description of 3D point clouds taken from the laser range scanner on the ground vehicle. Based on the spherical signature description of each point, the extractor of significant environmental features is learned by the Deep Belief Nets for the urban structure classification. Arbitrary point among the 3D point cloud can represents its signature in its sky surface by using several neighborhood points. The unit spherical surface centered on that point can be considered to accumulate the evidence of each angular tessellation. According to a kind of point area such as wall, ground, tree, car, and so on, the results of spherical signature description look so different each other. These data can be applied into the Deep Belief Nets, which is one of the Deep Neural Networks, for learning the environmental feature extractor. With this learned feature extractor, 3D points can be classified due to its urban structures well. Experimental results prove that the proposed method based on the spherical signature description and the Deep Belief Nets is suitable for the mobile robots in terms of the classification accuracy.

본 연구의 주목적은 유역의 유출응집구조를 분석하고 이를 기반으로 멱함수 법칙분포의 대표적 특성인 보편성을 수문학적 관점에서 입증해 보고자 하는 것이다. 이를 위하여 최우법에 따라 집수면적의 누가분포에 대한 멱함수 법칙분포의 적합을 수행하였으며 이로부터 도출된 멱함수 법칙분포의 지 수를 집수평면의 형상을 기반으로 평가하여 보았다. 주요한 결과로서 본 연구의 대상 유역들은 집수평면의 규모에 대하여 거의 모두 동일한 형태의 분 포를 취하고 있음을 확인할 수 있었다. 본 연구에서 얻은 멱함수 법칙분포의 지수는 선행연구에서 제시된 값에 비하여 다소 큰 수치로 나타났는데 이는 본 연구의 대상유역들이 가진 자기상사성의 특징을 반영하는 것으로 판단된다. 향후 DEM을 기반으로 보다 더 실제에 가까운 흐름방향모의를 통한 집 수평면의 멱함수 법칙분포의 보편성에 대한 연구가 반드시 수행되어야 할 것이다.

As a part of research to improve the recreation and tourism of Mt. Keumwon, this study undertook a visitor survey and investigated a structure model analysis to evaluate visitors’satisfaction of sightseeing. In socio-demographic background, the 60 percent of visitors was male, the 71.3% was 40s age and over, and the 80.7% was resident in Gyeongsang-do. A theoretical model with measurement was designed to explore and deduce a structural equation model (SEM), which was developed with hypotheses and data from 150 questionnaires collected in 2013. The results supported that display quality has a significant and positive influence on satisfaction more strongly compared to the influence of convenient use, convenient use has a significant and positive influence on satisfaction, and also display quality has a very significant and positive influence on convenient use. The visitors tend to evaluate convenient use to be better as display quality increases.

For elevated railway station on which track is connected with superstructure of station, structural vibration level and structure-borne-noise level has exceeded the reference level due to structural characteristics which transmits vibration directly. Therefore, existing elevated railway station is in need of economical and effective vibration reduction method which enable train service without interruption. In this study, structural vibration non-transmissible system which is applied to vibroisolating material for column member is developed to reduce vibration. That system is cut covering material of the column section using water-jet method and is installed with vibroisolating material on cut section. To verify vibration reduction effect and structural performance for structural vibration non-transmissible system, impact hammer test and cyclic lateral load test are performed for 1/4 scale test specimens. It is observed that natural period which means vibration response characteristics is shifted , and damping ratio is increased about 15~30% which means that system is effective to reduce structural vibration through vibration test. Also load-displacement relation and stiffness change rate of the columns are examined, and it is shown that ductility and energy dissipation capacity is increased. From test results, it is found that vibration non-transmissible system which is applied to column member enable to maintains structural function.

본 연구는 2009년부터 2015년까지 온게임넷에서 방영한 “켠김에 왕까지”를 분석한다. “켠김 에 왕까지”는 게스트가 게임을 시작한 후, 특정 게임을 끝내거나 미션을 임무하는 게임 프로그 램이다. 다른 게임 프로그램들과는 다르게, 대부분의 게스트들은 전문적인 게이머가 아닌 점을 통해 희극적인 도전과 유희를 보여 준다. 본 연구는 이 프로그램에서 사용된 비디오 게임의 다 양한 구성 요소를 분석한다. 구체적으로, 구성 요소들은 장르, 플랫폼, 국적, 클리어(완수) 시간 으로 분류된다. 이를 통해, 본 연구는 프로그램의 다양한 구성 요소를 분석할 뿐만 아니라, 게 임 프로그램에 대한 청사진도 제공한다.

Recently, buildings tend to be large size, complex shape and functional. As the size of buildings is becoming massive, the need for structural health monitoring(SHM) technique is ever-increasing. Various SHM techniques have been studied for buildings which have different dynamic characteristics and are influenced by various external loads. Generally, the visual inspection and non-destructive test for an accessible point of structures are performed by experts. But nowadays, the system is required which is online measurement and detect risk elements automatically without blind spots on structures. In this study, in order to consider the response of non-linear structures, proposed a signal feature extraction and the adaptive threshold setting algorithm utilized to determine the abnormal behavior by using statistical methods such as control chart, root mean square deviation, generalized extremely distribution. And the performance of that was validated by using the acceleration response of structures during earthquakes measuring system of forced vibration tests and actual operation.

This paper focuses on the vibration analysis of planar cable–driven parallel robots on their configurations. Despite of many advantages of the cable robots, elasticity of the cables may cause the vibration at the existence of external disturbance, resulting in deterioration of positioning accuracy. According to the vibration theory, having high first order natural frequency can prevent resonance with low frequency disturbance from the surrounding environment. A series of simulations showed that choosing frame / end-effector shape and cable connection method affects robots’ natural frequency. For the precise simulation, the cables are modeled as linear springs and axial vibration of cables is mainly considered. Aspect ratios of the frame and end-effector are defined as non-dimensional parameters while their areas are fixed. It was shown that vibration analysis guides to design a planar cable robot in terms of high capacity to reduce vibration.

이 논문의 목적은 압축강도 130 MPa급의 고강도 강섬유 보강 콘크리트 보의 휨거동 특성을 파악하는데 있다. 부피비 1.0%의 강섬 유와 철근비 0.02 이하의 철근으로 보강된 고강도 강섬유 보강 콘크리트의 휨거동 특성 실험결과를 제시하였다. 일반강도철근과 고강도철근 을 실험 부재에 사용하였다. 강섬유 보강 콘크리트의 압축 및 인장거동 재료 실험과 모델링을 수행하였다. 강섬유 보강 콘크리트의 하중-균열 개구변위 실험결과를 반영하여 가상균열모델에 근거한 역해석을 통해 인장거동모델링을 제시하였다. 실험결과는 강섬유 보강 콘크리트와 고 강도철근의 사용은 균열제어 및 연성 거동에 유리한 것을 나타낸다. 일반강도철근을 사용한 보의 휨강도 실험값에 대한 수치해석에 의한 예측 값의 비는 0.81~1.42를 나타내고, 고강도철근을 사용한 보의 휨강도 실험값에 대한 수치해석에 의한 예측값의 비는 0.92~1.07을 나타낸다. 수 치해석에 의한 휨강도는 실험결과를 합리적으로 예측하고 있는 것으로 판단된다.

사회기반시설물의 안전성을 효과적으로 평가하고 모니터링하기 위해 무선 스마트 센서가 개발되어 전 세계적으로 연구가 진행되 고 있다. 무선 스마트 센서는 통상 계측 및 임베디드 데이터 연산, 무선 통신이 가능한 공통점을 갖고 있어 기존의 유선 기반 센서가 가진 단점을 극복할 수 있을 것으로 기대되고 있다. 그러나 구조물의 장기 모니터링의 경우 내구성이 충분하지 못해 발생하는 센서 고장이나, 환경적 이유 로 인한 무선 통신이 불안정할 경우 계측 데이터를 가져올 수 없는 문제가 발생할 수 있다. 본 연구에서는 무선 스마트 센서 기반의 네트워크에 서 이와 같은 문제로 센서 노드에 무선 통신으로 접근할 수 없는 경우를 대처하기 위해, 칼만 필터 기반의 데이터 복구를 수행하여 무선 스마트 센서 네트워크의 신뢰성을 향상시키는 기법을 제안한다. 본 논문에서는 무선 스마트 센서의 연산 기능을 활용하여 네트워크 내에서 계측된 가 속도 데이터를 바탕으로 유실된 센서의 가속도 계측 데이터를 추정한다. 개발된 무선 스마트 센서 네트워크 시스템의 성능을 확인하기 위해 단 순보 구조에서 실험을 수행하여 추정된 가속도 응답과 계측 값을 비교하였다.

The prompt provision of risk map information is defined as a dynamic expression technology in this study. Based on the module, effective disaster information compression plan will be prepared, and prompt information transmission system will be secured in the future.

In order to understand the seismic performance of weir structure under seismic events, concrete weir structure with infinite foundations was modeled in ABAQUS. Additionally, this study conducted the three different design response spectra based on KBC 2009, ASCE 7-05, and EuroCode 8. The results from numerical analyses showed that the seismic behavior of weir structure subjected to seismic ground motions was sensitive to natural frequency and mass participation factors.

To minimize damage from disasters, various aspects of prevention, preparation, and response, etc. are being managed. A system that can share the identical disaster information based on prompt disaster management and prediction must be developed and constructed for integrated disaster management.

This study employed a Bayesian Markov Chain Monte Carlo based HEC-1 rainfall-runoff model to generate the plausible flood scenarios. The proposed modeling scheme showed a promising result in terms of estimating a set of model parameters and deriving their uncertainties. In this regard, the proposed model can be applied to various hydrologic applications such as frequency curve derivation, and hydraulic structures risk analysis.

A new array was suggested for effective leakage detection of concrete water facility. This array was modified to serve the purpose. Plus and minus currents have been installed respectively on the upstream and downstream water in order to detect the flow of water floating through the crack of facility. Potential poles in two lines have been installed closer than current sources to the weir to measure potential difference in upstream and downstream. Interpreting the potential difference data acquired by the new array, we could predict that where is the leakage zone. The possibility that can distinguish the leakage zone has been confirmed by numerical and physical modeling and problem position expected to leak was verified in field exploration.

This study presented the seismic performance of weir structures with infinite foundations subjected to seismic ground motions, rather than finite soil foundation to avoid the reflection of seismic wave propagation at the mesh boundaries. The analytical model of weir structures was developed in ABAQUS　platform and then the seismic performance of concrete weir structure was evaluated through design response spectrum (KBC 2009). It was revealed that the maximum stresses obtained from infinite models was significantly increased, in comparison to the finite models.

Waterside structures such as dams or levees are essential for flood protection, and flood induced failures of such structures can cause serious damages. Real-time safety prediction can prevent most of the damages to inland or the consequential economic damages induced by flood hazards. This study introduces a method of real-time safety prediction by evaluating the correlation between numerical simulation, real-time measurement, and geo-centrifuge data.

It is largely divided into two kinds in freezing phenomenon of the tunnel. Waterproof membrane damage inside the tunnel construction joints leaked into groundwater leak occurs in the icicle and despite the absence of damage to the waterproofing membrane, waterproofing membrane from the back of the ground water is frozen freeze by interfering with smooth

Frequent damages and safety incidences had occurred. Although Korea Expressway Coporation is well organized for various disaster and incidences on expressway based on its many experiences, it still have difficulties in demonstrating its superiority and capability in disaster management. Also when compared with disaster management framework of other organization in developed countries, level of the management still need the improvement.

This paper is presented in progressive improvement of the construction and maintenance for corrugated steel plate culverts in Korea expressway. After reviewing the technical consulting reports and field surveying this whole structures. It is effectively help to minimize damage and improve the stability of structures.