• Ocean Systems Engineering
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• v.7 no.3
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• pp.247-273
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• 2017

Many different engagement situations require naval ships to achieve some level of effectiveness. The performance of the naval ships is very important for such effectiveness. There have been many studies that analyze the effectiveness and the performance. The former are largely related to engagement level simulations, while the latter are largely related to engineering level simulations. However, there have been few studies that consider both the engagement level and the engineering level at the same time. Therefore, this study presents three case studies using engagement simulation of the engineering level to check the performance of the related parameters. First, detection performance simulations are carried out by changing the specifications of the passive sonars of a submarine in different scenarios. Maneuvering performance simulations are carried out by changing the specification of the hydroplanes of a submarine in different scenarios. Lastly, in order to check whether or not our forces would succeed in attacking enemy forces, we perform an engagement simulation with various naval ship models that consist of several engineering level models, such as command systems, weapon systems, detection systems, and maneuver systems. As a result, the performance according to the specifications of the naval ships and weapons is evaluated.

• Korean Journal of Construction Engineering and Management
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• v.14 no.4
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• pp.15-23
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• 2013

Because that construction project is usually uncertain and the plan of it changes frequently, it is difficult to make a reliable and feasible plan for it. As the BIM technology is developed, we can simulate the future of the construction project visually and make more reliable plan. However, data production efficiency is not so high, it is used just for animation and presentation usage. Although, a lot of construction simulation systems are developed, it is difficult to measure performance of them. In this study, we defined the construction simulation work process and the scenarios to measure performance of them. The performance measurement method using simulation process scenario can make possible benchmark test of them.

• Korea-Australia Rheology Journal
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• v.19 no.1
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• pp.7-16
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• 2007

A dynamic Monte Carlo percolation grid simulation is used to predict the cure behaviour of thermoset materials. Molecules are distributed in a fixed grid and a probability of reaction is assigned to each pair of neighbouring units considering both reaction rates and diffusion. The concentration and network characteristics are predicted throughout the whole curing process and compared to experimental data for an epoxy-amine matrix.

• Journal of the Korean Society for Precision Engineering
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• v.12 no.7
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• pp.131-137
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• 1995

The performance analysis is applied to the transmission of the tracked vehicle, comparing simulation results with vehicle test. The calculation method of hydrostatic pump/motor performance and power circulation is used for hydromechanical transmission simulation. And various shifting characteristics is analyzed by studying power flow at each range.

• Korean Parent-Child Health Journal
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• v.20 no.1
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• pp.10-17
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• 2017

Purpose: This study was conducted to investigate the effects of simulation-based education using high-fidelity simulator and standardized patient in nursing care for children with fever on nursing students. Methods: A total of 166 senior nursing students who completed pediatric nursing practicum courses participated in this study. The single group study design with pretest and posttest was used. The simulation education was provided for 200mins including orientation, simulation preparation, simulation practicum, and debriefing. Pre and post surveys were performed using questionnaires on clinical performance competency, communication skills, critical thinking disposition and self-confidence. Results: The mean scores of clinical performance competency (t=-2.56, p<.05), communication skills (t=-6.39, p<.001), critical thinking disposition (t=-3.43, p<.001), and self-confidence (t=-3.72, p<.001) in posttest were significantly higher than those in pretest. Also, clinical performance competency in nursing care for children with fever has significant relationships with communication skills, critical thinking disposition and self-confidence. Conclusion: The results indicate that simulation-based education using high-fidelity simulator and standardized patient is an effective strategy for improving clinical performance competency, communication skills, critical thinking disposition and self-confidence in nursing students. Further study is needed to verify the effects.

• The Journal of Korean Academic Society of Nursing Education
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• v.23 no.1
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• pp.66-75
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• 2017

Purpose: The aim of this study was to evaluate differences of pre-post simulation training in problem solving ability, performance confidence, and critical thinking skill according to degree of nursing students' self-leadership. Methods: This study was a descriptive survey using a self-report questionnaire. One hundred eighty nursing students participated in this study which programed a simulation scenario of pre-post operative patients' care. Descriptive statistics, paired t-test, ANCOVA with IBM SPSS 21.0 program were used for data analysis. Results: After the simulation training, both the above-average subjects and below-average subjects in self-leadership significantly improved their problem-solving ability, performance confidence, and critical thinking skill. compared with their previous level. The subjects who rated above-average in self-leadership, improved their degree of problem-solving ability, performance confidence, and critical thinking skill significantly more than those who were below-average in self-leadership. Conclusion: Self-leadership of nursing students is an important element in effective simulation training.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2004.03a
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• pp.369-375
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• 2004

Gas turbine engine simulation in terms of transient, steady state performance and operational characteristics is complex work at the various engineering functions of aero engine manufacturers. Especially, efficiency of control system design and development in terms of cost, development period and technical relevance implies controlling diverse simulation and identification activities. The previous engine simulation has been accomplished within a limited analysis area such as fan, compressor, combustor, turbine, controller, etc. and this has resulted in improper engine performance and control characteristics because of limited interaction between analysis areas. In this paper, we propose a new simulation methodology for gas turbine engine performance analysis as well as its digital controller to solve difficulties as mentioned above. The novel method has particularities of (ⅰ) resulting in the integrated control simulation using almost every component/module analysis, (ⅱ) providing automated math model generation process of engine itself, various engine subsystems and control compensators/regulators, (ⅲ) presenting total sophisticated output results and easy understandable graphic display for a final user. We call this simulation system GT3GS (Gas Turbine 3D Graphic Simulator). GT3GS was built on both software and hardware technology for total simulation capable of high calculation flexibility as well as interface with real engine controller. All components in the simulator were implemented using COTS (Commercial Off the Shelf) modules. In addition, described here includes GT3GS main features and future works for better gas turbine engine simulation.

• Proceedings of the KIEE Conference
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• 2003.10b
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• pp.275-277
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• 2003

Computer aided simulation is becoming an essential part in planning, design, and operation of railway systems. To determine the adequate performance and specification of railway system, it is necessary to calculate rolling stock's performance such as distance, speed, power etc when train's running. This paper presents result of train performance simulation using the program that developed in advance for Korea high speed train. To verify result of simulation, we have compared that with experiment data.

• Transactions of the Korean Society of Automotive Engineers
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• v.10 no.1
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• pp.168-178
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• 2002

The purpose of this study is to develop an optimal performance design ova concrete median barrier using the design of experiment and crash simulation which is done by Pam-Crash, one of the commercial crash simulation software. A formula of characteristic value was suggested to obtain an optimal performance design considering all of von Mises stress, volume and acceleration at center of gravity of a heavy truck. An optimal design of a concrete median barrier was obtained by the analysis of variance based on design of experiment and crash simulation. A crash simulation with the optimal design was accomplished in order to verify the suitability of the suggested formula and the proper application of the design of experiment. The obtained optimal design was satisfied for a domestic design regulation of a concrete median barrier.

• Journal of Ocean Engineering and Technology
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• v.28 no.6
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• pp.566-573
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• 2014

This paper presents the results of an integrated navigation performance analysis for selecting the sensor of an unmanned underwater vehicle (UUV) using Monte Carlo numerical simulation. An inertial measurement unit (IMU) and Doppler velocity log (DVL) are considered to build the integrated navigation system. The position error and price of the sensor are selected as performance indices to evaluate the volunteer integrated navigation systems. Monte-Carlo simulation is introduced to analyze the circular error probability (CEP) and its variance. Simulation results provide the proper sensor combination for integrated navigation in relation to the performance and price.