• Journal of Institute of Convergence Technology
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• v.2 no.2
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• pp.20-24
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• 2012

In this paper, we perform a ANSYS simulation of assembly structure composed of three parts, bolt, nut, and coil spring, under the loading of a screw torque 640~800 ($N{\cdot}m$) derived from the given bolt tensile strength 10.9, which allows us to investigate a lock-nut mechanism for the prevention of bolt-loosening after three parts are fastened. And also we investigate the safety factor of each component with effective stress distribution obtained from the simulation, which enables us to estimate the structural safety of a new lock-nut structure. Both simulation and investigation shown in this paper will contribute to the development of a new lock nut structure.

• Journal of the Korean Society of Industry Convergence
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• v.16 no.4
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• pp.147-152
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• 2013

According to the obligation of BIM application, the guidelines of energy simulation based on BIM are being presented. Although there is the advantage to minimize the error in energy analysis using the energy model, there are still issues about insufficient standards and the compatibility of the gbXML. Therefore, it is necessary to establish the processes to utilize and apply BIM methods for energy simulation. This study was examined on the compatibility of data for energy simulation by the gbXML schema and energy efficiency by BIM.

• Journal of the Korean Society of Industry Convergence
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• v.26 no.5
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• pp.945-952
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• 2023

In this study, the sand casting process was applied to design the gating system and perform casting simulation in order to domestically produce the submarine mast cover. Based on simulation results, casting experiments were conducted to produce a soundness prototype. The design concept of the mast cover's gating system was based on the design of bell casting. By arranging eight tower-type gates in a circle at 45° intervals, the flow of melt flowing into each gate was uniform and did not mix with each other, and the velocity of melt was also uniform. The mast cover made of Ni-Al-Bronze alloy has no unfilled parts. However, small porosities and flow marks occurred on the surface in several places. Yield strength and ultimate tensile strength are 279.3 MPa and 675.7 MPa, respectively, and elongation is 21.2%.

• Journal of Convergence for Information Technology
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• v.7 no.6
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• pp.1-7
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• 2017

This study examined the effects of simulation-based practice on competence and satisfaction in nursing students. We collected the data from 189 4th grade nursing students. Simulation-based practice was conducted from August 28th to November 27th, 2015. The collected data were analyzed by SPSS 21.0 program. As the result of simulation-based practice, significant improvement was found in competence (t=-14.42, p<.001) and satisfaction($4.53{\pm}.58$). Simulation-based practice can help students to improve their overall abilities in clinical practices and increase their satisfaction in result. Therefore we suggest that more systematic and continual simulation-based practice should be applied in nursing education.

• Journal of the Korea Society for Simulation
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• v.4 no.1
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• pp.121-130
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• 1995

This paper deals with modeling and simulation of an industrial benzene-toluene-xylene plant. Because the fractionation unit of benzene-toluene-xylene plant has a narrow range of boiling point and doesn't have any sidecut and side reboiler, we employed boiling point estimation method in the modeling and simulation of the plant. Soave-Redlich-Kwong equation was used in the computation of thermodynamical properties. We solved resulting nonlinear equations by using Newton-Raphson method which is known to show fast convergence. Results of simulation showed good agreement with actual plant operation data.

• 제어로봇시스템학회:학술대회논문집
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• 1992.10a
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• pp.315-320
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• 1992

This paper presents the simulation architecture and strategy for dynamic simulation of chemical process and describes key features of developed dynamic simulation system, MOSA(Multi-Objective Simulation Architecture). A plant structure may be partioned into several strong coupling units, called cluster. If this cluster is solved simultaneously, it is possible to simulate whole plant without introducing convergence problem of tear streams. In this study, a flexible modular approach based on clusters was proposed as a promising architecture for dynamic chemical process simulator.

• The Journal of the Acoustical Society of Korea
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• v.27 no.2E
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• pp.64-68
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• 2008

This paper investigates noise reduction performance and performs convergence analysis of a Variable Error Data Normalized Step-Size Least Mean Square(VEDNSS LMS) algorithm. Adopting VEDNSS LMS results in higher system complexity, but noise is reduced providing fast convergence speed Mathematical analysis demonstrates that tap coefficient misadjustment converges. This is confirmed by computer simulation with the proposed algorithm.

• 제어로봇시스템학회:학술대회논문집
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• 2001.10a
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• pp.176.4-176
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• 2001

In this paper, a novel type of iterative learning controller is studied. The proposed learning algorithm utilizes not only the error signal of the previous iteration but also the delayed error signal of the current iteration. The delayed error signal is adopted to improve the convergence speed. The convergence condition is examined and the result shows that the proposed learning algorithm shows the fast convergence speed under the same convergence condition of the traditional iterative learning algorithm. The simulation examples are presented to confirm the validity of the proposed ILC algorithm.

• Journal of the Korea Convergence Society
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• v.11 no.11
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• pp.417-423
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• 2020

The purpose of this study was to evaluate the effects of clinical practice and simulation-based practice for Women's Nursing Practice in terms of practice satisfaction, practice stress and clinical competence. The participants were male students in the second and third grades in nursing and total 63 students, 34 in the experimental group, and 29 in the control group. The experimental group participated in simulation-based practice for 6 Weeks, five hours and the control group participated in clinical practice at maternity ward for 10 days, nine hours each. The experimental group showed higher level of practice satisfaction (p<.001), practice stress (p= .048) and clinical competence (p= .030) compared to the control group. Simulation-based practice is an effective learning method for Women's nursing and can be used as the alternative for clinical practice. However, stress management strategies are needed for simulation-based practice.

• Journal of Convergence for Information Technology
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• v.11 no.4
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• pp.19-25
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• 2021

This study proposes a digital twin implementation method through simulation so that the manufacturing process can be optimized in a manual manufacturing site. The scope of the proposal is a knowledge management mechanism that collects manual motion with a sensor and optimizes the manufacturing process with repetitive experimental data for motion recognition. In order to achieve the research purpose, a simulation of the distribution site was conducted, and a plan to create an optimized digital twin was prepared by repeatedly experiencing the work simulation based on the basic knowledge expressed by the worker's experience. As a result of the experiment, it was found that it is possible to continuously improve the manufacturing process by transmitting the result of configuring the optimized resources to the physical system by generating the characteristics of the work space configuration and working step within a faster time with the simulation that creates the digital twin.