• Smart Structures and Systems
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• v.14 no.6
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• pp.1247-1267
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• 2014

Real-Time Hybrid Simulation (RTHS) is a novel approach conceived to evaluate dynamic responses of structures with parts of a structure physically tested and the remainder parts numerically modelled. In RTHS, delay estimation is often a precondition of compensation; nonetheless, system delay may vary during testing. Consequently, it is sometimes necessary to measure delay online. Along these lines, this paper proposes an online delay estimation method using least-squares algorithm based on a simplified physical system model, i.e., a pure delay multiplied by a gain reflecting amplitude errors of physical system control. Advantages and disadvantages of different delay estimation methods based on this simplified model are firstly discussed. Subsequently, it introduces the least-squares algorithm in order to render the estimator based on Taylor series more practical yet effective. As a result, relevant parameter choice results to be quite easy. Finally in order to verify performance of the proposed method, numerical simulations and RTHS with a buckling-restrained brace specimen are carried out. Relevant results show that the proposed technique is endowed with good convergence speed and accuracy, even when measurement noises and amplitude errors of actuator control are present.

• Journal of Engineering Education Research
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• v.21 no.6
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• pp.3-12
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• 2018

The importance of software in the engineering field is increasing day by day, so the utilization and understanding of the simulation software in the engineering design stage has become the core competence of the engineer. This study presents a new software education method for multiple systems in the field of mechanical engineering using a workflow execution environment as a sub-module of a computational platform (called EDISON platform) that can incorporate in-house software tools developed by many simulation tool developers. It can execute not only individual software tools such as fluid flow, structure, optimal design, but also conduct connective executions of multiple software tools. Based on this simulation environment, a methodology was proposed that can be applied to convergence types of engineering educations. By properly using this methodology, it is expected that beginning engineers could encourage their specialties understanding the big pictures of the analysis processes.

• Journal of the Korean Applied Science and Technology
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• v.40 no.6
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• pp.1425-1436
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• 2023

The purpose of this qualitative phenomenological study was to understand how nursing students make meaning of experiences with simulation education using standardized cerebral infarction patients. Data were collected through individual interviews with 10 nursing students up to 25 August, 2023, from June 25, 2023, and were analyzed using the phenomenological research analysis method suggested by Colaizzi. Three categories of the nursing student's experience of simulation education using standardized cerebral infarction patients: level of dimensions of nursing education, individual level of dimensions, job dimensions of nursing. And this study was increased nursing students' acquisition of competencies and understanding of cerebral infarction patient nursing. In simulation based practical training using standardized cerebral infarction patients with cerebral infarction, strategies are needed to strengthen positive factors, identify limited factors, and improve nursing competency.

• Journal of Power Electronics
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• v.19 no.5
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• pp.1087-1098
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• 2019

In this paper, a detuning factor (DeFac) method is proposed to design the key parameters for optimizing the transfer power and efficiency of an Inductively Coupled Power Transfer (ICPT) system with primary-secondary side compensation. Depending on the robustness of the system, the DeFac method can guarantee the stability of the transfer power and efficiency of an ICPT system within a certain range of resistive-capacitive or resistive-inductive loads. A MATLAB-Simulink model of a ICPT system was built to assess the system's main evaluation criteria, namely its maximum power ratio (PR) and efficiency, in terms of different approaches. In addition, a magnetic field simulation model was built using Ansoft to specify the leakage flux and current density. Simulation results show that both the maximum PR and efficiency of the ICPT system can reach almost 70% despite the severe detuning imposed by the DeFac method. The system also exhibited low levels of leakage flux and a high current density. Experimental results confirmed the validity and feasibility of an ICPT system using DeFac-designed parameters.

• The Journal of Korean Academic Society of Nursing Education
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• v.19 no.1
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• pp.5-15
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• 2013

Purpose: The purpose of this study was to explore nursing students experiences in team based simulation learning. This study was based on a phenomenological research methodology. Methods: Fourteen nursing students participated in this study. The students gave in depth interviews and wrote reflective journals after participating in a team based simulation learning program, which was provided at C University in Gwangju for 8 weeks, 2011. These data were analyzed using Van Kaam's method. Results: 21 sub-themes and 9 themes were elicited from 55 significant statements. They were classified into 3 categories such as : 'First exposed to lessons on how Burden', 'the enjoyment of team based simulation learning', 'expansion of the clinical competence'. Conclusion: Teaching and learning strategy that combines a variety of simulation training to nursing students to develop critical skills to improve their care to give and take advantage of simulation training supplement is advised.

• Journal of the Korean Society of Marine Environment & Safety
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• v.23 no.3
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• pp.294-300
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• 2017

In this study, a survey was conducted among students who received ARPA/radar simulation training in order to verify the effect of training. An effective training method based on the analysis results was also proposed. Furthermore, this study analyzed full mission simulation conducted over one semester, and found that training effect increased as time passed. The survey showed improvement in skills related to radar/ARPA utilization, ARPA decoding, ship handling, and overall skill. Students responded practical skills improved more than theoretical knowledge, and also analysis showed that ship handling skills had a larger effect than radar decoding skills on improving overall skill, therefore proposed that theoretical education regarding the functions of radar and ARPA should be reinforced in ARPA/radar simulation training.

• International Journal of Contents
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• v.4 no.2
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• pp.7-12
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• 2008

In this paper, we present a real-time physical simulation model of water surfaces with a novel method to represent the water mass flow in full three dimensions. In a physical simulation model, the state of the water surfaces is represented by a set of physical values, including height, velocity, and the gradient. The evolution of the velocity field in previous works is handled by a velocity solver based on the Navier-Stokes equations, which occurs as a result of the unevenness of the velocity propagation. In this paper, we integrate the principle of the mass conservation in a fluid of equilateral density to upgrade the height field from the unevenness, which in mathematical terms can be represented by the divergence operator. Thus the model generates waves induced by horizontal velocity, offering a simulation that puts forces added in all direction into account when calculating the values for height and velocity for the next frame. Other effects such as reflection off the boundaries, and interactions with floating objects are involved in our method. The implementation of our method demonstrates to run with fast speed scalable to real-time rates even for large simulation domains. Therefore, our model is appropriate for a real-time and large scale water surface simulation into which the animator wishes to visualize the global fluid flow as a main emphasis.

• The Journal of Korean Academic Society of Nursing Education
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• v.20 no.2
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• pp.212-222
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• 2014

Purpose: The purpose of this study was to evaluate the nursing students' clinical judgment skills in simulation using Tanner's Clinical Judgment Model. Method: Forty-five teams of a total 93 nursing students participated in a post-operative patient care scenario using human patient simulator. Data were collected from students' responses in scenario and guided reflective journaling according to the framework of Tanner's model which comprised noticing, interpreting, responding, and reflecting on response. Data were analyzed using descriptive statistics. Results: The students' responses of the situation were in accordance with the goals of scenario, i.e. relieving patient' pain and preventing pulmonary complications. However, most of students needed clinical cues and focused on a given clue to solve the issues. They were lack of ability to collect additional information as well as connect the relevant clues in simulated clinical situation. Conclusion: The nursing students have difficulty in what they notice, how they interpret finding, and respond appropriately to the situation. The simulation training using Tanner's model could provide faculty and nursing students with an effective teaching and learning strategy to develop the clinical judgment skills.

• Journal of Home Health Care Nursing
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• v.23 no.2
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• pp.147-154
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• 2016

Purpose: This study aimed to develop and apply simulation-based education, and to verify the effects of this type of education on nursing students' presence in education, systems thinking, and proactivity in problem solving. Method: Subjects were 69 senior college students recruited through convenient sampling. This study used a one-group pre-posttest quasi-experimental design. A structured survey was administered a week before and after provision of the simulation-based education once a week for 4 weeks. Data were analyzed using descriptive statistics and t-tests. Results: Teaching presence increased after the educational intervention; instructional design and organization, and aspect of direct facilitation subscales improved. Learning presence increased after the educational intervention; although cognitive presence did not change, emotional presence increased. With regard to emotional presence, perception and expression of one's emotional status increased, although emotional management did not change. Moreover, systems thinking increased. Among the subscales, team learning showed an increase after the educational intervention. However, there was no significant difference in proactivity in problem solving, although it showed an increase after the educational intervention. Conclusion: Based on the aforementioned study results, there is need to establish educational environments for qualitative teaching and learning presence, and devise strategies to increase learning effects with various teaching methods and type of content.

• Journal of information and communication convergence engineering
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• v.8 no.2
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• pp.180-184
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• 2010

This paper proposes a robot motion authoring using finger-robot interaction. The proposed method is a user friendly method that easily authors (creates and controls) robot motion according to the number of fingers. The effectiveness of the proposed motion authoring method was verified based on motion authoring simulation of an industrial robot.