• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.318-319
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• 2011

This paper presents a new user defined modeling about HVDC system based on the PSS/E. The principles, methods and procedures of user defined modeling for dynamic simulation are expounded. Comparing beween the dynamic simulations results of a power system by CDC4T in the PSS/E library and a user defined model CDCKU1 respectively, we illustrate the general usage of custom features and verify the model accuracy. Future work about CDCKU series and practical models will be considered to enhance the power system stability in Korea.

• 한국태양에너지학회 논문집
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• 제31권5호
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• pp.134-139
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• 2011

Since large and small scale photovoltaic(PV) systems have been commercialized in many countries, it is necessary to assess the effects of PV systems on the electric power system. For this, the development of accurate simulation model of PV arrays is very important. PSCAD/EMTDC, a widely used simulation tool for analyzing the transient behavior of electrical apparatus and networks, does not have a standard model of a PV array. Therefore in order to simulate the PV array, users have to develop their own simulation model. However, the block-diagram-based model is very complicated, and it is hard to modify the model parameters. In this study, we develop the user-defined model of a PV array by using the Design Editor, which is provided by PSCAD program. The mathematical model of a PV array and the method to determine the parameters of nonlinear I-V equation are implemented in a Fortran code. The graphical user interface provides the users with easy and simple way to modify the PV array parameters and simulation conditions. In order to help the users, this model also provides the parameters of 10 commercial PV arrays.

• 국제학술발표논문집
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• The 5th International Conference on Construction Engineering and Project Management
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• pp.433-436
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• 2013

This study suggests IFC-based bridge information modeling methods and its application model in BIM environment. Data model extension for bridge structure was achieved using user-defined property sets based on IFC framework. First, identification information was added. Bridge members are identified through physical and spatial semantic information added as property sets. Instances for semantic information were assigned according to standardized rules. Second, CO2 related factors were added for application information model. It can play a role to calculate and manage the quantity of CO2 emission. Third, properties for temporary structure to estimate and manage the construction cost were added. Finally, we investigated proposed methods through implementing the application information model of bridges.

• 한국음향학회지
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• 제39권2호
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• pp.131-136
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• 2020

음성 인식기를 대기모드에서 동작 모드로 전환하기 위해 발화하는 짧은 단어를 기동어(Wake Up Word, WUW)라고 하며, 음성 인식기를 실제로 사용하는 사용자가 지정한 기동어를 사용자 정의 기동어라고 한다. 본 논문에서는 이러한 사용자 정의 기동어를 인식하기 위해 기존의 Gaussian Mixture Model-Hidden Markov Model(GMM-HMM) 기반의 시스템, Linear Discriminant Analysis(LDA)를 적용한 LDA-GMM-HMM 기반의 시스템과, LDA-GMM-HMM 모델에서 GMM을 Deep Neural Network(DNN)로 대체한 LDA-DNN-HMM 기반의 시스템을 제작하고 각 시스템의 사용자 정의 기동어 인식 성능 및 비기동어 거절 성능을 비교한다. 또한 기동어 인식기의 체감 성능을 향상시키고자 각 모델에 threshold를 적용하여 기동어 인식 실패율을 약 10 % 수준으로 감소 시킨 후에 비기동어(non-WUW)의 거절 실패율을 비교 평가한다. Threshold 적용시에 LDA-DNN-HMM 기반의 시스템의 경우 기동어 인식 실패율 9.84 % 수준에서 비기동어 거절 실패율이 0.0058 %의 인식 성능을 나타내어 LDA-GMM-HMM 시스템 보다 약 4.82배 향상된 비기동어 거절 성능을 나타낸다. 이러한 결과는 본 논문에서 제작한 LDA-DNN-HMM 모델이 사용자 정의 기동어 인식 시스템을 구축하는데 효과적임을 입증한다.

• Journal of Magnetics
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• 제19권4호
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• pp.378-384
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• 2014

Optimization design and robust design are significant measures for improving the performance and reliability of electromagnetic devices (EMDs, specifically refer to relays, contactors in this paper). However, the implementation of the above-mentioned design requires substantial calculation; consequently, on the premise of guaranteeing precision, how to improve the calculation speed is a problem that needs to be solved. This paper proposes a new method for establishing an approximate model for the EMD. It builds a relationship between the input and output of the EMD with different coil voltages and air gaps, by using a user-defined interpolating function. The coefficient of the fitting function is determined based on a quantum particle swarm optimization (QPSO) method. The effectiveness of the method proposed in this paper is verified by the electromagnetic force calculation results of an electromagnetic relay with permanent magnet.

• 한국멀티미디어학회논문지
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• 제21권2호
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• pp.158-165
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• 2018

Since a large amount of multimedia image has dramatically increased, it is important to search semantically relevant image. Thus, several semantic image annotation methods using RDF(Resource Description Framework) model in mobile environment are introduced. Earlier studies on annotating image semantically focused on both the image tag and the context-aware information such as temporal and spatial data. However, in order to fully express their semantics of image, we need more annotations which are described in RDF model. In this paper, we propose an annotation method inferencing with RDFS entailment rules and user defined rules. Our approach implemented in Moment system shows that it can more fully represent the semantics of image with more annotation triples.

• 산업공학
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• 제23권2호
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• pp.100-107
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• 2010

For proper ergonomic evaluation using a digital human model simulation (DHMS) system such as $RAMSIS^{(R)}$, the postures of humanoids for designated tasks need to be predicted accurately. The present study (1) evaluated the accuracy of driving postures of humanoids predicted by RAMSIS, (2) proposed a method to improve its accuracy, and (3) examined the effectiveness of the proposed method. The driving postures of 12 participants in a seating buck were measured by a motion capture system and compared with their corresponding postures predicted by RAMSIS. Significant discrepancies ($8.7^{\circ}$ to $74.9^{\circ}$) between predicted and measured postures were observed for different body parts and driving tasks. Two methods (constraints addition and user-defined posture) were proposed and their effects on posture estimation accuracy were examined. Of the two proposed methods, the user-defined posture method was found preferred, reducing posture estimation errors by 11.5% to 84.9%. Both the posture prediction accuracy assessment protocol and user-defined posture method would be of use for practitioners to improve the accuracy of predicted postures of humanoids in virtual environments.

• 전기학회논문지
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• 제58권11호
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• pp.2175-2184
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• 2009

This paper describes operational analysis results of the DC micro-grid using detailed model of distributed generation. Detailed model of wind power generation, photo-voltaic generation, fuel-cell generation was implemented with the user-defined model of PSCAD/EMTDC software that is coded with C-language. The operation analysis was carried out using PSCAD/EMTDC software, in which the power circuit is implemented by built-in model and the controller is modelled by user-defined model that is also coded with C-language. Various simulation results confirm that the DC micro-grid can operate without any problem in both the interconnected mode and the islanded mode. The operation analysis result confirms that the DC micro-grid make it feasible to provide power to the load stably. And it can be utilize to develop the actual system design and building.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.584-585
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• 2007

In this paper describe the block simulator that simulate generator's contoler such as governor, exciter and stabilizer. To use legacy tool such as PSS/E for user defined model is very difficult. The simulation tool such as Matlab/Simulink is easy to simulate user defined model but integrate simulation and power system network analysis is unavailable. As a result this paper show that block simulator for contoler model verify. It is include block simulator design, implementation and verify to Matlab/Simulink.

• 산업공학
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• 제24권1호
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• pp.1-7
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• 2011

The purpose of this research was to develop an integrated interface for the usability test of systems or products in the design process. It is capable of automatically creating GOMS models which can predict human task performances. It can generate GOMS models to be interacted with the prototype interfaces. It can also effectively manage various design information and various usability test results to be implemented into the new product and/or system design. Thus we can perform usability test for products or system prototypes more effectively and also reduce time and effort required for this test. For usability tests, we established an integrated interface based on GOMS model by the LabVIEW program. We constructed the system that the linkage to GOMS model is available. Using this integrated interface, the menu structure of mobile phone can be constructed easily. User can design a depth and a breath that he want. The size of button and the label of the button is changable. The path to the goal can be defined by the user. Using a designed menu structure, the experiment could be performed. The results of GOMS model and the actual time are presented. Besides, values of operators of GOMS model can be defined as the value that user wants. Using the integrated interface that we developed, the optimal menu structure deducted. The menu structure that user wants can be established easily. The optimal layout and button size can be decided by comparison of numerous menu structures. User can choose the method of usability test among GOMS model and empirical data. Using this integrated interface, the time and costs can be saved and the optimal menu structure can be found easily.