• 한국정보과학회:학술대회논문집
• /
• 한국정보과학회 2008년도 한국컴퓨터종합학술대회논문집 Vol.35 No.1 (A)
• /
• pp.369-370
• /
• 2008

• 대한간호학회지
• /
• 제44권3호
• /
• pp.259-269
• /
• 2014

Purpose: The purpose of this study was to construct and test a structural equation modeling on burnout of clinical nurses based on CS-CF model. Methods: A survey using a structured questionnaire was conducted with 557 clinical nurses. Data were analyzed using structural equation modeling. Results: The modified hypothetical model yielded the following ${\chi}^2=289.70$, p<.001, RMSEA=.09, GFI=.93, TLI=.91, CFI=.94, PCFI=.65, AIC=363.21, SRMR=.05 or less and showed good fit indices. Nursing work environment, patient safety culture and resilience showed indirect effects on burnout while compassion fatigue and compassion satisfaction had direct effects. Conclusion: Results of this study suggest that compassion fatigue must be decreased and compassion satisfaction has to be increased, while burnout is lowered by enhancing the clinical nursing work environment, patient safety culture and resilience. In addition, more variables and longitudinal studies are necessary to validate the clear cause-and-effect relationship between the relevant variables.

• 한국실내디자인학회논문집
• /
• 제26권3호
• /
• pp.13-24
• /
• 2017

Promoting barrier-free living environments is necessary in residential facilities on which senior citizens rely most of their lives. Safety of elder people can be reassured by a certification system based on the existing barrier-free certification program in public facilities. The range of certification does not cover all living area, but is limited to the bathroom, which is a sanitary space. Given the nature of BIM modeling, an existing multi-family building was selected and modeled, as the certification process requires all the necessary information and various viewport. BIM modeling of the bathroom was conducted in accordance with the requirements of the certification for barrier-free living environment. The results suggested that there is a need for a removal of thresholds, larger doors, better selection of finishing materials, sufficient room for a wheelchair, larger space next to the toilet, and the availability of an emergency bell and grab bars. Such information supports the potentials of BIM modeling, and it is expected that an automated certification system would be established in the foreseeable future.

• Environmental Engineering Research
• /
• 제23권2호
• /
• pp.164-174
• /
• 2018

Corrosion of copper alloys (copper, bronze and brass) in soil was evaluated at ambient temperature using various methods such as electrochemical impedance spectroscopy (EIS), polarization curves and Scanning Electron Microscopy (SEM) coupled with Energy Dispersive Spectroscopy microanalysis measurements. Three equivalent circuits were separately used to interpret the obtained impedance spectra. The EIS measurements indicated that the polarization resistance of all electrodes increases with increasing the immersion time. SEM showed a presence of three layers of corrosion products with various composition and morphology covering each electrode. In addition, it was found that at 20% of moisture content the $R_p$ values and the current density of all electrodes in the studied soil give the following order: copper > bronze > brass. Good consistency between the data obtained from EIS and PP measurements was observed.

• 컴퓨터교육학회논문지
• /
• 제10권3호
• /
• pp.49-56
• /
• 2007

그리드는 과학이나 공학 분야에서 대규모 연산을 효율적으로 수행하기 위한 플랫폼으로 제공된다. 이러한 환경에서 자원관리나 태스크 스케줄링은 다루기가 매우 복잡하다. 본 논문에서는 웹 기반의 그리드 컴퓨팅 환경에서 시스템을 모델링하고 스케줄링 기법을 시뮬레이션 할 수 있는 스케줄링 툴킷(GridTool)을 설계하고 구현하였다. 구현한 웹 기반 그리드 스케줄링 툴킷은 자바 환경의 툴킷인 GridSim을 시뮬레이션 도구로 활용하였으며, 자원 모델링, 작업 모델링, 알고리즘 컴파일, 시뮬레이션, 성능분석을 웹 환경에서 효율적으로 수행할 수 있다. 본 논문에서 구현한 스케줄링 툴킷은 향후 그리드 연구에 기반구조로 활용될 수 있으며, 스케줄링 알고리즘의 성능 분석을 위한 도구로 사용될 수 있다.

• Asian Journal of Atmospheric Environment
• /
• 제8권4호
• /
• pp.184-191
• /
• 2014

Air quality in a subway tunnel has been crucial in most of the subway environments where IAQ could be affected by many factors such as the number of passengers, the amount and types of ventilation, train operation factors and other facilities. A modeling approach has been introduced to manage the general IAQ in a subway station. Field surveys and $CO_2$ measurements were initially conducted to analyze and understand the relationship between indoor and outdoor air quality while considering internal pollution sources, such as passengers and subway trains, etc. The measurement data were then employed for the model development with other statistical information. For the model development, the algorithm of simple continuity was set up and applied to model the subway IAQ concerned, while considering the major air transport through staircases and tunnels. Monitored $CO_2$ concentration on the concourse and platform were correlated with modeling results where the correlation values for the concourse and platform were $R^2=0.96$ and $R^2=0.75$, respectively. It implies that the box modeling approach introduced in this study would be beneficial to predict and control the indoor air quality in subway environments.

• 한국전자거래학회:학술대회논문집
• /
• 한국전자거래학회 2001년도 International Conference CALS/EC KOREA
• /
• pp.615-624
• /
• 2001

Internet technology opens up another domain for building future CAD/CAM environment. The environment will be global, network-centric, and spatially distributed. In this paper, we present a new approach to network-centric virtual prototyping (NetVP) in a distributed design environment. The presented approach combines the current virtual assembly modeling and analysis technique with distributed computing and communication technology fur supporting virtual prototyping activities over the network. This paper focuses on interoperability, shape representation, and geometric processing for distributed virtual prototyping. STEP standard and CORBA-based interfaces allow the bi-directional communication between the CAD model and virtual prototyping model, which makes it possible to solve the problems of interoperability, heterogeneity of platforms, and data sharing. STEP AP203 and AP214 are utilized as a means of transferring and sharing product models. In addition, Attributed Abstracted B-rep (AAB) is introduced as 3D shape abstraction for transparent and efficient transmission of 3D models and for the maintenance of naming consistency between CAD models and virtual prototyping models over the network.

• 한국지하수토양환경학회지:지하수토양환경
• /
• 제10권4호
• /
• pp.13-17
• /
• 2005

암모늄의 질산화 반응, 질소산화물의 탈질 반응, 그리고 유기물의 산화반응을 고려한 SAT 모델링 시스템에 대해서, 현장조건의 변화에 따른 모델 결과를 비교하기 위해 6가지 모델 조건에 대한 가상의 수직 2차원상 모델 시뮬레이션을 하였다. 시뮬레이션 조건에서 수리전도도, 주입수 주입율, 지표 피복 여부, 그리고 운영 계획과 같은 4가지 영향 인자들이 고려되었다. 시뮬레이션 결과, 모든 조건에서 모델 개발 과정에서 고려한 반응 영향들이 잘 모사되었다.

• 한국음향학회지
• /
• 제41권4호
• /
• pp.397-409
• /
• 2022

본 논문에서는 거리 종속환경에서 해수면에 의한 배경소음 모델링을 수행하였다. 모델링 환경에서 음원은 해수면 근처에서 수평 방향의 전 영역에서 위치하고, 수신기 배열은 거리 종속환경의 해양 도파관 내에 위치하였다. 거리 종속환경에서의 소음원과 수신기 간의 음파전달은 연성모드법을 사용하여 계산되었으며, 이를 이용하여 수신기 간 상호 스펙트럴 밀도행렬 식을 유도하였다. 계산된 상호 스펙트럴 밀도행렬은 소음 인텐시티, 빔형성 결과, 코히런스 함수를 계산하는 데 사용되었으며, 그 결과를 거리 독립환경에서의 결과와 비교하였다. 이를 통해 해저면 특성에 의한 수직 방향성과 거리 종속환경에 의한 수평면상의 비대칭성 특성이 모델링 결과에 반영됨을 확인하였다.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 2002년도 ICCAS
• /
• pp.108.6-108
• /
• 2002

It is greatly important to understand the mechanics of AFM-based nanorobotic manipulation for efficient and reliable handling of nanoparticles. Robust motion control of an AFM-based nanorobotic manipulation is much challenging due to uncertain mechanics in tip-sample interaction dominated by surface and intermolecular force and limitations in force and visual sensing capability to observe environment. This paper investigates a nanomechanic modeling which enables simulation for AFM-based nanorobotic manipulation , and its application to motion planning of an AFM-based nanorobot. Based on the modeling of intermolecular and adhesion force in AFM-based nanomanipulation, the behaviors of an AFM ca...