• Journal of the Korean Magnetics Society
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• v.27 no.2
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• pp.54-62
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• 2017

This paper presents a design of the Interior Permanent Magnet Synchronous Motor (IPMSM). an initial design process is accomplished by using the parametric design. In the design process, motor characteristics of parameters is computed by the d-q axis equivalent circuit model. Then, an optimal design process is accomplished by combination the experimental design and the response surface method. Finally, the design and analysis results are verified with experimental results.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.26 no.4
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• pp.241-246
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• 2013

From the numerical results of density-based topology design optimization, a CAD geometric model is constructed and fabricated using 3D printer to experimentally validate the optimal design. In the process of topology design optimization, we often experience checkerboard phenomenon and complicated branches, which could result in the manufacturing difficulty of the obtained optimal design. Sensitivity filtering and morphology methods are used to resolve the aforementioned issues. Identical volume fraction is used in both numerical and experimental models for precise validation. Through the experimental comparison of stiffness in various designs including the optimal design, it turns out that the optimal design has the highest stiffness and the experimental result of compliance matches very well with the numerical one.

• Korean Journal of Optics and Photonics
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• v.23 no.1
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• pp.32-35
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• 2012

In this paper, an analysis of the optimized 3D depth of integral imaging is proposed. We achieve this by calculating the amount of image distortion and considering the threshold of recognition in the human visual system. Experimental results are also provided to test the theory.

• Proceedings of the Korea Water Resources Association Conference
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• 2006.05a
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• pp.1726-1731
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• 2006

Hydraulic and numerical models were applied to design the emergency spillway of ImHa multipurpose Dam. For the numerical model, FLOW-3D was used to evaluate the three-dimensional flow in the spillway. The results of hydraulic model were compared with those of the numerical model which were separated into four zones such as approaching zone, weir zone, transition & tunnel chute zone, and dissipator zone. Moreover, for optimum design of the spillway, the hydraulic and numerical models were performed for the basic plan. Solving the problems of the basic plan, the optimized alternative design was proposed. The numerical models for various conditions of the spillway were performed, which is not always feasible in the hydraulic models. Verified by using the hydraulic models, the optimum alternative design was proposed.

• Proceedings of the Materials Research Society of Korea Conference
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• 2003.03a
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• pp.154-154
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• 2003

고품질의 합금강 생산 시 가장 큰 영향을 미치는 레이들정련은 고온 하에서 반응 및 유동이 일어나므로 실제조업 직접관찰이나 측정이 대단히 어려울 뿐만 아니라, 수많은 조업인자와 상호 결합되어 있기 때문에 최적의 작업조건을 찾는데 많은 시행착오를 겪는다. 본 실험에서는 직접 조업하는 조건과 가장 부합하는 수모델 실험 및 Flow 3D를 이용한 수치해석 방법으로 비용의 절감 및 실험에 대한 위험부담 등 시행착오를 최소화하면서 최적의 작업조건을 도출하여 고품질 합금강 생산성과 process 효율성의 극대화를 찾을 수 있다. 따라서 본 연구에서는 슬래그의 물성(슬래그 양, 점도)을 고려한 gas bubbling 조건(가스유량, 유체높이, ladle 크기, 단공nozzle, porous plug 위치)에 따른 용강의 교반특성 및 용강의 슬래그 혼입 거동을 조사함으로써 고청정 용강 제조를 위한 최적 gas bubbling 조건을 설정하기 위한 수모델 실험과 수치해석 연구를 실시하였다. 수모델 실험을 통한 기포형성 거동과 용강의 교반특성에 대한 현상론적 연구와 병행하여, 유동장 측면에서 이상유동을 가정한 수치해석을 통해 실제 용강 래들 내에서의 거동을 정량화 하고자 한다.

• The Korean Journal of Applied Statistics
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• v.6 no.2
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• pp.303-309
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• 1993

In this paper we have defined two approaches to be error-robust when the precise form of error-structure is unknown. An experiment is optimal by the first criterion if it maximizes the minimum effciency over all candidates of error structure and is optimal by the second if it maximizes the minimum average of the efficiency over all candidates of error structure. In order to appreciate the basic implications of each design criterion, these approaches are applied to two different experimental situations, D- and heteroscedastic G-optimalities.

• The Korean Journal of Applied Statistics
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• v.4 no.2
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• pp.195-207
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• 1991

We consider the development of simple regression-like diagnostics for assessing the sensitivity of an optimal design to deviations from the assumptions of constant error variance. This contains a review of Cook's local influence approach and an application of local influence aproach to D-optimal experimental design. The method is applied in a number of simple examples in Section 3. Conclusions and directions for further research follow in Section 4.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.41 no.11
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• pp.9-15
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• 2004

We propose optimal interference rejection weight for multistage parallel nulling (MPN) partial parallel interference cancellation (PPIC) receiver previously proposed to enhance the performance of V-BLAST for downlink multiple-input multiple-output (MIMO) multicarrier (MC)-code division multiple access (CDMA) systems. MPN-PPIC method proposed in [1] was based on the parallel interference cancellation (PIC) with fixed interference rejection weight obtained experimentally. However, the fixed weight can not be adapted to various systems efficiently, thus we proposed method for the optimal interference rejection weight based on the received signal to interference and noise ratio (SINR), and the performance of the proposed method was evaluated through computer simulation comparing with the previous method. We obtained performance gains of 2.5 dB ~ 5 dB for BER of 10$^{-3}$ .

• Communications for Statistical Applications and Methods
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• v.2 no.1
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• pp.64-73
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• 1995

혼합물 실험계회긔 확장시 기존의 연구들은 D-최적계획을 중심으로 전개되어 왔다. 이러한 판정기준들은 실험계획의 전 영역에 걸친 성능의 정도를 알아내는 데는 한계가 있다. 이러한 단점을 극복하기 위하여 하나의 그래픽 방법을 제안하였다. 혼합물 실험 계획에서 결측값이 발생하는 경우에도 이 그래픽 방법을 이용할 수 있다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.21 no.2
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• pp.326-332
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• 1996

In this paper, a method to design the sending loudness rating(SLR) is proposed and the desirable transmission characteristics are considered in order to specify the transmission quality, based on the loudness ratings, for the digital telephone system that is a terminal for digital speech communication. To specify the desirable SLR for digital telephone system, the subjective test defining the preferred range of inout level for CODEC was performed. From the test results, it was identified that the optimal input level for CODEC is -15dB and the range not to cause the quantization noise and the distortion of CODEC fall within -12dB and -18dB.