• Geomechanics and Engineering
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• 제5권6호
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• pp.519-540
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• 2013

This paper presents an optimal design method for determining pile lengths of piled raft foundations. The foundation settlement is evaluated by taking into account the raft-pile-soil interaction. The analysis of settlement is simplified by using Steinbrenner's equation. Then the total pile length is minimized under the settlement constraint. An extended sequential linear programming technique combined with an adaptive step-length algorithm of pile lengths is used to solve the optimal design problem. The accuracy of the simplified settlement analysis method and the validity of the obtained optimal solution are investigated through the comparison with the actual measurement result in existing piled raft foundations.

• 센서학회지
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• 제20권2호
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• pp.107-113
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• 2011

LSPR(Localized Surface Plasmon Resonance) sensor measures the refractive index change on the sensor surface. The detection of biological reaction with the unknown refractive index needs to be converted into the signal sensitivity for the refractive index change for comparison with other measurements. To find the signal sensitivity, the three steps of signal processing are proposed, which are signal modeling, signal calibration and signal normalization of LSPR sensor. The detected signal of biotin-streptavidin interaction has been converted into unit of [RU](Resonance Unit) using the proposed method. The converted signal directly can be compared with the other sensors including commercialized one.

• 로봇학회논문지
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• 제14권4호
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• pp.311-317
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• 2019

Direct teaching is an essential function for collaborative robots for easy use by non-experts. For most robots, direct teaching is implemented only in joint space because the realization of Cartesian space direct teaching, in which the orientation of the end-effector is fixed while teaching, requires a measurement of the end-effector force. Thus, it is limited to the robots that are equipped with an expensive force/torque sensor. This study presents a Cartesian space direct teaching method for torque-controlled collaborative robots without either a force/torque sensor or joint torque sensors. The force exerted to the end-effector is obtained from the external torque which is estimated by the disturbance observer-based approach with the friction model. The friction model and the estimated end-effector force were experimentally verified using the robot equipped with joint torque sensors in order to compare the proposed sensorless approach with the method using torque sensors.

• International Journal of Naval Architecture and Ocean Engineering
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• 제10권2호
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• pp.119-128
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• 2018

A numerical method is proposed to simulate level ice interaction with ship in transverse and longitudinal directions in time domain. A novel method is proposed to simulate non-symmetric transverse force in a stochastic way. On the basis of observations from the model tests, the simulation of longitudinal force combines the ice bending force acting on the waterline, submersion force below the waterline and ice friction forces caused by transverse force and ice floes rotation amidships. In the simulations the ship was fixed and towed through an intact ice sheet at a certain speed. The setup of the numerical simulation is similar to the ice tank setup as much as possible. The simulated results are compared with model tests data and the results show good agreement with the measurement.

• 한국지능시스템학회논문지
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• 제22권2호
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• pp.192-197
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• 2012

DNA 마이크로어레이 기술의 발달과 함께 이를 활용한 질병 진단 및 치료 예후 확인을 목적으로 하는 연구가 활발히 진행 되고 있다. 일반적으로 마이크로어레이 데이터를 이용한 실험에서는 특징들의 수에 비해 적은 샘플의 수, 내재적 측정 노이즈, 서로 다른 샘플들 간의 이질성 등이 분류 성능을 떨어트리는 원인이 된다. 이러한 문제를 극복하기 위해 패스웨이 기반의 기능적 모듈 단위의 마커를 사용하는 방법들이 새롭게 제안 되었다. 이들은 패스웨이의 멤버 유전자들의 발현 값을 요약하여 해당 패스웨이의 활성도로 사용하는데, 기존의 기법들과 비교하여 뛰어난 분류 성능과 재현성을 보여주었다. 그러나 이러한 활성도 계산 방법은 개별 유전자들과 표현형 사이의 상관관계를 무시하거나, 개별 유전자들이 갖는 발현 특성이 제거 되는 단점들이 있다. 본 논문에서는 선택된 기능적 모듈 단위의 유전자들의 부분집합들을 기반으로 약 분류기를 구성하고, 이들의 분류 결과를 결합하여 최종 결과를 추론하는 앙상블 분류 기법을 제안한다. 이 과정에서 유전자 상호작용 정보와 mRMR 필터를 사용하는 필터링과정을 통해 탐색 공간을 최소화하여 분류 성능을 높일 수 있도록 하였다. 제안 된 방법의 성능을 테스트하기 위해 폐암 데이터에 적용한 결과, 기존의 기법들에 비해 신뢰성이 있고 우수한 분류 성능을 보여주었다.

• 대한간호학회지
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• 제35권3호
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• pp.514-525
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• 2005

Purpose: This study was to examine the effects of a Self-management program on physical function and quality of life of women with knee osteoarthritis. Method: The participants for this study, who had knee osteoarthritis, were recruited from an arthritis clinic, at a university hospital located in S city, Korea between February 16, 2004 and June IS, 2004. Seventeen subjects in the control group received no intervention and 18 subjects in for experimental group received an individual Self-management program. The self-management program consisted of dietary education and home-based exercise; walking and resistance exercise. The subjects performed this program 5 times per week during 8 weeks and recorded a diary for diet and exercise. In order to verify the effects of the Self-management program, physical function and Quality of life as a dependent variable were measured at three points in time: before, week4 and week8 after the interventions. Result: There were significant increases on physical function (F=5.08, p=.002) and significant interaction effects (F=7.42, p=.002) in the intervention group over the three measurement points in time. In addition, there were significant increases on quality of life (F=8.08, p=.002) and significant interaction effects (F=4.89, p=.016) in the intervention group over the three measurement points in time. Conclusion: This study revealed that a Self-management program can be used as an efficient nursing intervention for women with knee osteoarthritis.

• International Journal of Aeronautical and Space Sciences
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• 제11권2호
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• pp.145-153
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• 2010

In this work, the comprehensive structural dynamics codes including DYMORE and CAMRAD II are used to validate the higher harmonic control aeroacoustic rotor test (HART) II data in descending flight condition. A total of 16 finite elements along with 17 aerodynamic panels are used for the CAMRAD II analysis; whereas, in the DYMORE analysis, 10 finite elements with 31 equally-spaced aerodynamic panels are utilized. To improve the prediction capability of the DYMORE analysis, the finite state dynamic inflow model is upgraded with a free vortex wake model comprised of near shed wake and trailed tip vortices. The predicted results on aerodynamic loads and blade motions are correlated with the HART II measurement data for the baseline, minimum noise and minimum vibration cases. It is found that an improvement of solution, especially for blade vortex interaction airloads, is achieved with the free wake method employed in the DYMORE analysis. Overall, fair to good correlation is achieved for the test cases considered in this study.

• 대한간호학회지
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• 제50권1호
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• pp.81-100
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• 2020

Purpose: The purpose of this study was to define and clarify the concept of political competence for nurses. Methods: A hybrid model method was used to investigate the dimensions, attributes, and definitions of the concept. In the theoretical stage of the study, literature on nursing, politics, and other discipline were reviewed. In the fieldwork stage, individual in-depth interviews and focus groups interviews were conducted with politically seasoned experts or activists who had an understanding of the concept of political competence for extensive descriptions in nursing and field of health care. Results: The concept of political competence was represented in four dimensions as political knowledge, political efficacy, political interaction, and political activity. In the political knowledge dimension, there were three attributes, namely, political knowledge, political information and systematic analysis ability. The political efficacy dimension had three attributes of internal political efficacy, external political efficacy, and self-pride of nursing profession. The political interaction dimension had three attributes of organizations and community service, networking, and persuasive power. The political activity dimension had six attributes of political leadership, political expression, assertive behavior, political advocacy, political participation, and policy intervention. Conclusion: This concept development might provide a basic understanding of developing a measurement tool and for constructing a theory promoting nurses' political competence.

• 한국지반공학회논문집
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• 제28권4호
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• pp.67-78
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• 2012

철지반의 비선형성을 고려한 말뚝지지 전면기초의 3차원 해석기법(YSPR)을 개발하였다. 전면기초는 6개의 자유도를 가진 평면쉘 요소로, 말뚝은 보-기둥 요소로 모델링하여 전면기초와 결합하였다. 또한 말뚝두부 및 지반의 강성은 $6{\times}6$ 강성행렬로 모델링 하였으며, 전면기초-말뚝-지반의 상호작용은 비선형 하중전이함수를 이용하여 선형/비선형거동의 모사가 가능하도록 하였다. 기존의 단순해석기법, 유한요소해석 및 현장계측값과의 비교 분석 결과, 본 해석기법이 대단면 말뚝지지전면기초에서 말뚝의 축하중 분포와 침하량을 비교적 정확히 산정하는 것으로 판단되며, 이러한 검증을 토대로 실제 대단면 기초설계에 대한 적용 가능함을 확인할 수 있었다.

• 디지털융복합연구
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• 제12권9호
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• pp.353-358
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• 2014

인터렉티브 아트는 관람객들과 상호 작용을 전제로 예술 작품을 구현하는 것으로 가상성, 몰입성, 상호작용성을 특징으로 한다. 그에 따라 관람객이 작품으로 몰입하게 하는 연구는 매우 중요하다. 현재까지 인터렉티브 아트분야에서, 몰입을 측정하기 위해서는 주로 설문지나 인터뷰, 정신 생리학적인 방법을 이용하였다. 그러나 이 방법들은 작품 관람 이후에 진행되어져서 정확한 몰입 측정이 어려우며 작품 관람에 방해를 줄 수 있다. 본 연구에서는 이를 개선하기 위해서 모바일 기기와 카메라를 이용하여 관람객들의 동선을 파악하고 관람시간을 중심으로 한 몰입 측정 방법을 제안한다. 본 논문은 작품의 몰입 정도를 파악하는데 도움을 제공한다.