• Proceedings of the KIPE Conference
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• 2012.11a
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• pp.3-4
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• 2012

PV 시뮬레이터는 제한된 공간에서 PCS(Power Conditioning System)의 성능을 평가하거나, 고장유무를 검사하는데 필수적인 장비이다. PV 시뮬레이터가 PV 어레이와 동일한 동작을 하기 위해서는 다양한 재질의 PV cell에 대하여 모델링이 가능해야한다. 본 논문은 EN50530에 규정되어 있는 최대전력운 전범위인 $V_{MPP}{\pm}10%$ 구간에서 발생하는 오차를 다른 PV cell 모델링 알고리즘과 비교하고 제안한 알고리즘의 우수함을 증명하였다.

• Proceedings of the Korean Society of Agricultural Engineers Conference
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• 1998.10a
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• pp.353-358
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• 1998

GRASS-AGNPS model integrated with GIS was applied to rural watersheds having complex land use characteristics and evaluated for its applicability through calibration using observed data. The analyses of raster encoding accuracy and model behavior to runoff, sediment yields and nutrient loads for different cell-size showed that 150 m cell size indicated reasonable applicability of the model. Simulated runoff was in a good agreement with the observed data and simulated peak runoff rate was larger than the observed data. The sediment yield simulated by modified AGNPS model using irregular cell for forest area were less than that of the regular cell method. In predicting sediment yields, the result showed a different trend at each representative rural watershed. Nutrient loads simulated by the model were significantly different from the observed data.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.39 no.4
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• pp.26-34
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• 2002

A dynamically-allocated topographical model, so-called cell advancing model, has been developed modifying the cell model. Memory requirements are reduced by dynamically allocating completed topography and material information only at surface cells, and setting other cells as a material index. In this paper, this model is presented and verified with applications to etching process by using the analytic model and Monte Carlo model for the incident ion flux, deposition process, and process integration. In case of DRAM cell fabrication process with 5,440,500(130$\times$155$\times$270) cells takes about 22MB memory to represent the topography.

• Transactions of the Korean hydrogen and new energy society
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• v.34 no.5
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• pp.465-477
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• 2023

In proton exchange membrane fuel cell (PEMFC), proper thermal management of the stack and moisture generation by electrochemical reactions significantly affect fuel cell performance. In this study, the PEMFC dynamic characteristic model was developed through Simcenter AMESim, a development program. In addition, the developed model aims to understand the thermal resin balance of the stack and performance characteristics for input loads. The developed model applies the thermal management model of the stack and the moisture content and permeability model to simulate voltage loss and stack thermal behavior precisely. This study extended the C based AMESet (adaptive modeling environment submodeling tool) to simulate electrochemical reactions inside the stack. Fuel cell model of AMESet was liberalized with AMESim and then integrated with the balance of plant (BOP) model and analyzed. And It is intended to be used in component design through BOP analysis. The resistance loss of the stack and thermal behavior characteristics were predicted, and the impact of stack performance and efficiency was evaluated.

• The Korean Journal of Health Service Management
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• v.10 no.3
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• pp.185-197
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• 2016

Objectives : The purpose of this study was to identify the influencing factors of cell phone addiction in adolescents and to construct a cell phone addiction model for adolescents. Methods : Data from the 5th Korean Child-Youth Panel Survey (KCYPS) was analyzed with the SPSS 20.0 and 23.0 AMOS programs. Results : According to the model of this study, depression had statistically significant direct effects while emotional characteristics and parental abuse had statistically significant indirect effects on cell phone addiction in adolescents. School life adjustment had statistically significant direct and indirect effects on cell phone addiction in adolescents. Conclusions : Based on the results of this study, it is necessary to develop prevention and intervention programs to combat cell phone addiction in Korean adolescents.

• Journal of the Korean Society for Precision Engineering
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• v.24 no.5
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• pp.118-126
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• 2007

A finite element simulation model was developed for the performance optimization of a closed type air-cell mattress used for the ulcer prevention. An H-model with material properties of human flesh and kinematic joints were used for the calculation of the body contact pressure. The material property of rubber air-cell was evaluated by tensile test of standard specimen. We evaluated the body contact pressure distribution after laying human model on the inflated air-cell mattress. It was found that the body contact pressure was dependent on cell height. but hardly affected by the thickness of the rubber in a cell.

• Journal of Advanced Marine Engineering and Technology
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• v.39 no.4
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• pp.374-380
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• 2015

In this paper, a dynamic model describing the 2 phase effect on the gas diffusion layer depending on load change of a fuel cell stack was developed to examine the effects of liquid water in fuel cell cathode gas diffusion layer on the fuel cell performance. For the developed model, 2 phase effect on the performance of a fuel cell stack depending on the load changes, concentration distribution of water vapor and oxygen inside a gas diffusion layer, the effect of the thickness and porosity of the gas diffusion layer on the fuel cell stack voltage were examined. As a result, a fuel cell stack voltage for the 2 phase model within the scope of the research become lower than that for the 1 phase model regardless of the load. Although oxygen molar concentration for the gas diffusion layer adjacent to the catalyst layer was the lowest, water vapor concentration is the highest. In addition, as thickness and porosity of the gas diffusion layer increased and decreased, respectively, the fuel cell stack voltage decreased.

• Proceedings of the Safety Management and Science Conference
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• 2009.04a
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• pp.429-438
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• 2009

In order to find out the customer requirements and to develop new products more effectively, the Kano model and QFD(Quality Function Deployment), AHP(Analytic Hierarchy Process) developed and applied. But, Many companies difficult to select the CTQ(Critical to Quality) of new product. Especially the life cycle of cell phone is very short. In this thesis, the Kano model and AHP(Analytic Hierarchy Process) for finding the CTQ(Critical to Quality) for customer satisfaction are suggested. It is explained and discussed with the example of cell phone.

• 한국신재생에너지학회:학술대회논문집
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• 2005.06a
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• pp.353-356
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• 2005

We developed a dynamic model of PEM fuel cell system which can analyze its transient response to dynamic load current. System components such as compressor, air cooler, humidifier, and stack were modeled based on their dynamic equations and performance maps by using Matlab Simulink platform. Through this simulation model, dynamic characteristics of fuel cell system including oxygen excess rat io, stack voltage, and system efficiency were shown. In addition to that, we briefly analyzed the humidity effect on cathode pressure and system efficiency, expecting that this model can be further used to optimize fuel cell system parameters just like operating pressure and temperature, humidity and oxygen excess ratio.

• IE interfaces
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• v.15 no.4
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• pp.364-373
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• 2002

This paper developed an operating software for the manufacturing cell of a model plant. The model plant, which was manufactured by Fishertechnik, consists of an assembly cell, a machining cell, and supplementary material handling equipments. Each I/O module of the model plant communicates with the INTERBUS controller devices via High-level Language Interface(HLI). The machining center has two machining cells, which consists of 4 machines respectively, two 3-axis portal transporters, and a rail guided vehicle(RGV). The Petri-Net was used to investigate the dynamics of each machining cell, e.g., the relation of material handling equipments and machines. The operating software was analyzed and designed by Object Oriented Technique. The software was implemented using Delphi 3.0 under Windows 95/NT operating system.