• Korean Journal of Remote Sensing
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• v.37 no.3
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• pp.649-655
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• 2021

This study purposes to cross-validate its performance by applying the optimal seismic vulnerability assessment model based on previous studies conducted in Gyeongju to other regions. The test area was Pohang City, the occurrence site for the 2017 Pohang Earthquake, and the dataset was built the same influencing factors and earthquake-damaged buildings as in the previous studies. The validation dataset was built via random sampling, and the prediction accuracy was derived by applying it to a model based on a random forest (RF) of Gyeongju. The accuracy of the model success and prediction in Gyeongju was 100% and 94.9%, respectively, and as a result of confirming the prediction accuracy by applying the Pohang validation dataset, it appeared as 70.4%.

• 주택과사람들
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• s.222
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• pp.82-85
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• 2008

'NEXT21'은 오사카가스가 미래의 환경 에너지, 거주에 관한 문제를 함께 고려하기 위해 1993년, 일본 오사카 시내에 건설한 획기적인 실험 주택이다. 오사카가스는 NEXT21을 통해 1994년부터 현재까지 끊임없는 연구 개발 및 검증을 수행해왔다. 고유가에 시대 더 주목받고 있는 NEXT21의 성과를 살펴보고, 우리에게 주는 시사점은 무엇인지 생각해보자

• Journal of the KSME
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• v.51 no.7
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• pp.45-48
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• 2011

이 글에서는 한국기계연구원 원자력산업기기연구센터에서 수행하고 있는 원전기기 성능시험을 위한 설비 및 기술개발과 원전기기의 기기검증(Equipment Qualification) 등의 업무에 대해 소개하고자 한다.

• Journal of the Korea Society for Simulation
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• v.20 no.4
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• pp.21-29
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• 2011

Wireless sensor nodes operate in open environments. The deployed sensor nodes are very vulnerable to physical attacks from outside. Attackers compromise some sensor nodes. The compromised nodes by attackers can lead to false data injection into sensor networks. These attacks deplete the limited energy of sensor nodes. Ye et al. proposed the Statistical En-Route Filtering (SEF) as a countermeasure of the attacks. The sensor node in SEF examines the event reports based on certain uniform probability. Thus, the same energies are consumed in both legitimate reports and false reports. In this paper, we propose a method that each node controls the probability of attempts to verify a report to reduce energy consumption of sensor nodes. The probability is determined in consideration of the remaining energy of the node, the number of hops from the node to SINK node, the ratio of false reports. the proposed method can have security which is similar with SEF and consumes lower energy than SEF.

• Geotechnical Engineering
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• v.12 no.6
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• pp.87-100
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• 1996

This paper verifies the accuracy and efficiency of the implicit stress integration algorithm for an anisotropic hardening constitutive model developed in a companion paper[Oh & Lee (1996)3. Simulation of undrained triaxial test results shows the accuracy of the method through an error estimation, and analyses of accuracy and convergence were performed for a numerical excavation problem. As a result, the stress was accurately integrated by the algorithm and the nonlinear solution was converged to be asymptotically quadratic. Furthermore nonlinear FE analysis of a real excavation problem was by performed considering the initial soil conditions and the in-situ construction sequences. The displacements of wall induced by excavation were more accurately estimated by the anisotropic hardening model than by the Cam-clay model.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.34 no.12
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• pp.82-89
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• 2006

This paper describes the development results of electrohydraulic actuation system which performs the attitude and trajectory control of pitch and yaw motion using thrust vector control for high altitude launching vehicle operated in high vacuum environment (altitude higher than 300 km). As compared with electrohydraulic actuation system for low altitude launch vehicle which operated under altitude of stratosphere, the intensified development requirements, newly adopted design and manufacturing technologies, newly developed test equipments and test results are summarized in this paper. The development test and evaluation of actuation system were successfully accomplished. The developed actuation system will be installed on KSLV-I after finishing verification of interface and integration compatibility with related other systems.

• Proceedings of the Korean Society for Bioinformatics Conference
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• 2005.09a
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• pp.243-248
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• 2005

도메인 조합에 기반한 단백질 상호작용 예측 기법은 효모와 같은 특정 종에 대하여 우수한예측 정확도를 보이는 것으로 알려졌으나, 인간과 같은 고등 생명체의 단백질에 대한 상호작용 예측을 수행하기 위하여는 여러종에 대한 기법의 적절성검증과 최적의 학습집단 구성 방안에 대한 연구가 선행되어야 한다. 본 논문에서는, 초파리 단백질을 이용한 예측 정확도 검증으로 도메인 조합 기법의 일반화 가능성을 타진 하고 이종간의 상호작용 예측실험 및 정확도 검증을 통하여 비교적 연구가 덜 되어진 종의 단백질 상호작용 예측을 위한 학습집단 구성 방법에 대하여 기술한다. 초파리 실험에서는 10351개의 상호작용이 있는 단백질 쌍 가운데, 80%와 20%를 각각 학습집단 및 실험집단으로 사용하였으며, 상호작용이 없는단백질 쌍의 학습집단은 1배에서 5배까지 변화시키면서 예측 정확도를 관찰하였다. 이 결과77.58%의 민감도와 92.61%의 특이도를 확인하였다. 이종간의 상호작용 예측 실험은 효모, 초파리, 효모, 초파리에 해당하는 학습집단 각각을 바탕으로 Human, Mouse, E. coli, C. elegans 등의 단백질 상호작용 예측을 수행하였다. 실험 곁과 학습집단의 도메인이 실험집단의 도메인과 많이 겹칠수록 높은 정확도를 보여주었으며, 도메인 집단간의 유사도를 나타내기 위해 고안한 Domain Overlapping Rate(DOR) 는 상호작용 예측 정확도의 중요한 요소임을 찾아내었다.

• Journal of the Society of Naval Architects of Korea
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• v.30 no.4
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• pp.112-126
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• 1993

In this paper, unified requirements of IACS on longitudinal strength of ships are investigated using nonlinear wave loads analyses under short term irregular waves. Also, analyses on IACS wave data were carried out for the purpose of presenting the guideline for future use. While keeping theoretical consistensy, the rule requirements for horizontal shear force, bending moment and torsional moment are newly proposed for the ships of large deck openings bases on the calculation results for 17 sample ships. The requirements for side shell hydrodynamic pressure are also presented. All the calculated results are compared with other Societies and present KR rules. These formula will be checked when corresponding requirements of structural scantling are determined.

• Aerospace Engineering and Technology
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• v.5 no.2
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• pp.108-113
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• 2006

This paper includes the test results of KOMPSAT-2 payload downlink system which were measured for the purpose of performance verification. The antenna beam patterns which indicates the status of the interface & antenna itself, were measured as well as the antenna VSWR. The checkout of the transponder & its spectrum was followed and this made sure that there was no spurious output distinguished. Finally a test for BER verification was conducted between satellite and receiving system for their compatibility through the antenna-to-antenna connection using an antenna hat. Verification tests for an RF system should be performed after relocation, integration and test for environments in order to make sure that no degradation happens.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.8 no.4
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• pp.821-825
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• 2007

In this study, the single hardening model with stress history-dependent plastic potential, which has been most recently proposed based on the critical state soil mechanics and needs few model parameters, was verified for the normally, lightly, and heavily over-consolidated clayey specimens. The triaxial compression tests were strictly conducted. The predictions using the single hardening model generally agree with the measurement. The discrepancy exists on its main focusing on the principal stress rotation; however, the plastic work H and the principal stress rotation angle ${\beta}$ are found to be effective indicators of loading history for the plastic potential function of the stress path dependent materials.