• 제목/요약/키워드: Simulation Study

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등온화용기를 이용한 누설유량 시뮬레이션에 관한 연구 (A Study on the Simulation of Leak Flow-rate Using Isothermal Chamber)

  • 지상원;장지성
    • 동력기계공학회지
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    • 제14권5호
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    • pp.71-75
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    • 2010
  • Leak detection technology is a challenging research until nowadays, because it has wide and various applications in industry. Furthermore pneumatic component reliability test based on ISO requires air leakage measurement. The conventional measurement methods need a complex operation and the calibration of leak detector. Tracing the history of our study, we proposed a new method for measurement of leak flow rate using isothermal chamber. In this study, propose a simulation model of isothermal chamber by infinitesimal flow -rate, such as a leak flow-rate. The effectiveness of the proposed simulation model is proved by simulation and experimental results. Base on the comparison results, proposed simulation model is good agreement with experimental results.

해군 건선거 모의실험 연구 (A Simulation Study of Navy Drydocks)

  • 조덕운
    • 한국국방경영분석학회지
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    • 제9권2호
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    • pp.23-30
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    • 1983
  • A simulation study was conducted to determine optimum capacity of Navy drydock facility using GASP-IV, an advanced FORTRAN-based simulation language, under demands of regular overhauls and emergency repairs by ships of an hypothetical fleet composition. Three year dock usage data was analyzed to produce probability distributions underlying drydock repair demands. The present facility size of two drydocks was simulated and was found to be somewhat short of adequate service capability, showing excessive average waiting time and average queue length. The simulation model was then modified to include an additional drydock of similar size as the other two and a year's simulation was again conducted. All repair needs were quite satisfactorily met and all docks showed very high utilization factor (0.98). This contributed to an increase in the fleet's ship availability from 0.95 to 0.99. This study illustrates the usefulness of simulation technique as a tool for analyzing policy alternatives in military long-term investment areas.

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지능형 교통 시스템을 위한 수도권 지역에 대한 DSRC 통신망 시뮬레이션 연구 (A Simulation Study on ITS/DSRC Communication Networks for Metropolitan Seoul area.)

  • 이희상;김윤배;박진수;이성룡;최경일
    • 한국시뮬레이션학회논문지
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    • 제9권2호
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    • pp.103-118
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    • 2000
  • ITS(Intelligent Transportation System) is an advanced system which can effectively handle the current transportation problems. DSRC(Dedicated Short Range Communication) is considered as a promising technology since it has the capability of two-way communication and can serves to implement various ITS services. In this paper, we study DSRC based ITS telecommunication traffic analysis and suggest an architecture and network design of telecommunication network for DSRC services. We also perform a simulation study to validate the proposed network architecture and design for Metropolitan Seoul Area with various network alternatives. In this simulation, we use actual traffic data and road characteristics from Seoul area and use our DSRC service configuration.

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Stress, Interpersonal Relationship, Learning Perception and Self-Efficacy of Nursing Students in Team Based Learning Simulation Practice

  • Lee, Mi-Ok
    • 한국컴퓨터정보학회논문지
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    • 제22권11호
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    • pp.73-79
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    • 2017
  • The purpose of this study was to identify differences in stress, interpersonal relations, learning perceptions and self-efficacy of nursing students participating in team based learning simulation practices. The study group consisted of 24 students in the third grade who attended nursing college. Data were collected using questionnaires. The collected data were analyzed by SPSS 22 version's descriptive statistics, t-test, and paired t-test. The results showed that stress and learning perceptions were significantly different according to gender, leave of absence in pre and post - test. After the practice of team - based simulation, the stress of nursing college students decreased and interpersonal relations and self - efficacy were improved. The results of this study showed that nursing students' gender and absence of school should be considered in the team - based simulation. Further research on team based simulation practice involving interpersonal relationships is needed.

LED 공정분석을 위한 시뮬레이션 연구 (A Simulation Study for Analyzing a LED Assembly Process)

  • 윤철호
    • 한국산학기술학회논문지
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    • 제8권4호
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    • pp.924-929
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    • 2007
  • 본 논문에서는 LED 생산 조립 공정에서의 시뮬레이션 분석모델을 제안한다. 모델의 목적은 LED 공정설계에 있어서의 여러 대안의 성능에 대해 평가하는 것이다. 시뮬레이션 모델을 개발하기 위하여 먼저 시간연구가 수행되었다. 동시에 ARENA 시뮬레이션 도구를 이용하여 공정분석을 수행하였다. 이 결과 LED 공정에 있어서의 문제점이 적시되었고 이를 개선하기 위한 대안이 논의되었다.

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시뮬레이션을 이용한 혼합모델 조립라인밸런싱 (Mixed Model Assembly Line-Balancing Using Simulation)

  • 임석진;김경섭;박면웅;김승권
    • 한국시뮬레이션학회논문지
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    • 제11권4호
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    • pp.69-80
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    • 2002
  • This study deals with the productivity improvement on a flow production system with the consideration of line-balancing. In a flow production system, similar product models are produced on a same assembly line, the predefined process order and the limitation of total worker number. The system can be increased the work-in -process(WIP) inventory and the worker's idle time. In this study, the worker assignment model is developed to assign evenly workload of process to each product model in such a manner that each process has the different number of worker. This worker assignment model is the mathematical model that determines worker number in each process such that the idle time of processes is reduced and the utilization of worker is improved. We use a simulation technique to simulate the production line proposed by the mathematical model and apply real production line. With the result of simulation, this study analyzes the propriety of production line and proposes the alternatives of new production line

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호흡곤란환자 간호의 실습교육평가에서 Multi-mode와 SimMan(R) 시뮬레이션 활용 비교 (Comparison of Multi-Mode Simulation and SimMan(R) Simulation on Evaluation of Nursing Care for Patients with Dyspnea)

  • 이숙정;노영숙;김주옥;장기인;류언나;박영미
    • 한국간호교육학회지
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    • 제16권1호
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    • pp.51-60
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    • 2010
  • Purpose: The purpose of this study was to compare the effects of nursing simulations between multi-mode simulation and $SimMan^{(R)}$ simulation on nursing students' nursing competency, satisfaction, and simulation participation experience in nursing care for patients with dyspnea. Method: Subjects were 107 junior nursing students in R College of Nursing in Seoul from June to November in 2009. Students were allocated to either a Multi-mode simulation group or a $SimMan^{(R)}$ simulation group. The multi-mode simulation consisted of standardized patients combined with Vital Sim, comparing the $SimMan^{(R)}$ group. Result: The Multi-mode simulation group reported higher levels of nursing competency (p=.017) but lower communication skills (p<.001) compared to the $SimMan^{(R)}$ simulation group. There were no meaningful differences in satisfaction of simulation education between the two groups. The $SimMan^{(R)}$ simulation group received a substantial health assessment and the Multi-mode simulation group experienced reality in caring for standardized patients. Conclusion: The findings of this study demonstrated that Multi-mode simulation has similar educational effects like $SimMan^{(R)}$ simulation and suggest that nurse educators should match simulation fidelity with educational goals for effective education.

자동차 공기현가 공압회로 해석 및 대체회로 설계 (Analysis and Alternative Circuit Design of Pneumatic Circuit for An Automotive Air Suspension)

  • 이재천
    • 유공압시스템학회논문집
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    • 제5권4호
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    • pp.17-25
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    • 2008
  • This study presents an analytical model of the pneumatic circuit of an air suspension system to analyze the characteristics of vehicle height control. The analytical model was developed through the co-simulation of Simulink(air spring) and HyPneu(pneumatic circuit). Variant effective area of air spring and flow coefficients of pneumatic valves were estimated experimentally prior to the system test, and utilized in simulation. One-comer test apparatus was established using the components of commercial air suspension products. The results of simulation and experiment were so close that the proposed analytical model in this study was validated. However the frictional loss of conduit and heat dissipation which were ignored in this study need to be considered in future study. As an application example of proposed analytical model, an alternative pneumatic circuit of air suspension to conventional WABCO circuit was evaluated. The comparison of simulation results of WABCO circuit and alternative circuit show that proposed analytical model of co-simulation in this study is useful for the study of pneumatic system of automotive air suspension.

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간호대학생의 가상 시뮬레이션 실습 경험 (Nursing students' experiences in virtual simulation practice)

  • 김윤정;김원정;민혜영
    • 한국간호교육학회지
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    • 제26권2호
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    • pp.198-207
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    • 2020
  • Purpose: The purpose of this study was to explore the meaning of nursing students' experiences in virtual simulation practice. Methods: The participants were six nursing students who have experience in a virtual simulation. Data were collected from August to September 2019 through a focus group interview. Giorgi's phenomenological method was used for analysis. Results: The study results revealed 3 constituents and 6 sub-constituents that are essential for nursing student's experiences in a virtual simulation. The three constituents were: "Chaos in the virtual reality", "The process of adjusting to chaos", and "Becoming an independent nurse in a safe virtual reality". Conclusion: Based on the results of this study, the following suggestions are made. Results suggest the development of virtual simulations in Korean, the use of simulations as a group activity first, and the use of simulation between lecture and practice or in the regular curriculum. The results of the study can be used as primary data for providing virtual simulation in nursing education.

Make-up Coordination의 Simulation 개발에 관한 연구 (A Study on the Development of Simulation for Make-up Coordination)

  • 김효숙;강인애
    • 대한가정학회지
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    • 제39권12호
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    • pp.65-77
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    • 2001
  • The purpose of this study is to propose development of simulation for make-up coordination by computer graphics and web animation program. In the 20th century, the power of the internet and www has been growing at such a rapid speed and also has provided the possibility of numerous market. Especially the internet marketing of womens products like cosmetics come into the spotlight as the way of sales. Many companies advertise their new products and give useful guidline of make-up technic on the website. So the contents of the website is one of the important thing to lead customer to purchasing. For the reason, this study tries develope a simulation of model in which customer can select their shape of face, color and theme whatever necessary. The model, color, theme palletes were designed by 'PHOTOSHOP 6.0'and the web image of simulation was made by 'FLASH ANIMATION 5.0'. As a result of this study is 1. It can give the chance to customer to make their own image of shape, color and theme through the simulation more speedly and exactly. 2. It can help company to advertise their new products, offer service for customers and lead customers to purchasing. 3. By accummulating the database, it can help to develop educational make-up system.

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