• 한국시뮬레이션학회논문지
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• 제11권3호
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• pp.1-12
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• 2002

Experimental design in simulation provides an efficient way of economizing simulation runs since a considerable number of simulation runs that originally were planned can be reduced by this approach. This experimental design method is an active area of research together with the output analysis and so no single panacea seems to exist so far. Thus, selection of techniques of experimental design and output analysis more likely depends upon the objective of simulation analysis, budget constraint and sometimes the analyst's subjective judgment. This paper attempts to describe an experimental design methodology for port investment analysis using a case study in a bulk terminal in Korea. Detailed display will be focused on simulation period, warm-up period, the number of replications needed in production runs after brief explanation on the system configuration.

• 한국시뮬레이션학회:학술대회논문집
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• 한국시뮬레이션학회 2001년도 The Seoul International Simulation Conference
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• pp.72-76
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• 2001

Experimental design in simulation provides an efficient way of economizing simulation runs since a considerable number of simulation runs that originally were planned can be reduced by this approach. This experimental design method is an active area of research together with the output analysis and so no single panacea seems to exist so far. Thus, selection of techniques of experimental design and output analysis more lithely depends upon the objective of simulation analysis, budget constraint and sometimes the analysts subjective judgment. This paper attempts to describe an experimental design methodology for port investment analysis using a case study in a bulk terminal in Korea. Detailed display will be focused on simulation period, warm-up period, the number of replications needed in production runs after brief explanation on the system configuration.

• 한국수학교육학회지시리즈C:초등수학교육
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• 제26권1호
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• pp.29-43
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• 2023

수학교과에서 단순히 수학적 개념을 습득하는 것보다 수학과 관련된 문제를 실생활에 적용하는 맥락적 문제해결의 중요성이 강조되고 있다. 이에 본 연구는 장애학생을 대상으로 실제적 상황을 나타내는 문장제 문제에 대한 연구 동향을 살펴보고자 하였다. 이를 위해 2000년에서 2022년까지 발행된 단일대상실험설계를 사용하여 중재의 효과를 탐구한 논문 최종 12편을 선정하여 참여학생 특성, 중재 환경, 중재 방법 및 교수전략 등에 대해 분석하였다. 그 결과, 초등학교 고학년을 대상으로 연구가 가장 많이 이루어졌고, 학습장애, 자폐성장애, 지적장애를 포함하는 다양한 장애 유형을 대상으로 연구가 진행된 것을 확인하였다. 중재는 대부분 연구자에 의해 이루어졌고, 1회기 당 30~40분 정도로 중재가 제공되었다. 장애학생을 위한 수학문장제 문제 중재 방법으로 도식 기반 교수, 인지-초인지 전략 교수, 테크놀로지 기반 교수를 적용한 것으로 나타났고, 대부분 명시적 교수를 함께 사용한 것으로 확인되었다. 또한 본 연구에 포함된 12편의 단일대상연구가 방법론적으로 타당하게 실행되었는지를 분석하고자 Council of Exceptional Children에서 제시한 질적지표를 사용하여 평가하였고, 이러한 결과를 종합하여 향후 장애학생을 위한 문장제 문제 연구 방향에 대해 논의하였다.

• Current Optics and Photonics
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• 제5권4호
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• pp.375-383
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• 2021

We present a simulation method to design antireflection coating (ARCs) for fiber-coupled superconducting nanowire single-photon detectors. Using a finite-element method, the absorptance of the nanowire is calculated for a defined unit-cell structure consisting of a fiber, ARC layer, nanowire absorber, distributed Bragg reflector (DBR) mirror, and air gap. We develop a method to evaluate the uncertainty in absorptance due to the uncontrollable parameter of air-gap distance. The validity of the simulation method is tested by comparison to an experimental realization for a case of single-layer ARC, which results in good agreement. We show finally a double-layer ARC design optimized for a system detection efficiency of higher than 95%, with a reduced uncertainty due to the air-gap distance.

• 응용통계연구
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• 제11권2호
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• pp.451-459
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• 1998

반응표면분석에서 다반응값의 최적화 문제는 단반응값 최적화문제보다 복잡하다. 이런 다반응값 문제에서 반응변수들이나 설명변수 상호간의 관계나 중요성 등을 평가하는 것은 중요하다. 이러한 평가를 위하여 biplot를 이용할 수 있는데, 1차 회귀모형이 적합치 않은 경 우, 2차 회귀모형을 위한 순차적 실험계획을 이용하여 2차 회귀 모형에 대응되는 biplot를 그려 선형 및 비선형효과를 알 수 없게 된다.

• Journal of Advanced Marine Engineering and Technology
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• 제10권4호
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• pp.67-77
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• 1986

The information on the heat transfer characteristics, flow pattern and pressure drop, are very important for the desing of general heat exchanger, refrigerating system, air conditioning system and energy recovery system. In these systems, water or lubricating oil contained in working fluid affects greatly the flow and heat transfer condition and this phenomena must be considered in the practical design. An experiment has been performed for studying the flow and heat transfer characteristics of the forced convective horizontal flow of R-113 under the range of the liquid single phase state to the boiling flow state. Basic experimental results are obtained in the case that water or lubricating oil does not contaminate in the test fluid. Experimental results are as follows; (1) The local heat transfer coefficients in the nucleate boiling region and transition boiling region are almostly ten times as large as that of liquid single phase flow. (2) The measured heat transfer coefficient in the present experimental range is relatively agreed well with the predicted value from the various experimental results for the boiling flow.

• 전력전자학회논문지
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• 제7권1호
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• pp.18-29
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• 2002

기존의 역률 개선 컨버터는 경 부하에서 높은 직류 링크 전압을 갖는다. 특히 라인 전압이 높고 부하가 작을 경우, 직류 링크 전압은 매우 높은 전압을 갖게 되어 실용상 문제가 존재한다. 본 논문에서 역률 개선 부로 벅 토폴로지를 갖는 새로운 단일 전력 단 역률 개선 컨버터를 제안하였다. 또한 제안된 컨버터의 타당성을 증명하기 위해 제안된 회로의 설계 예를 보였으며, 설계 시 고려되어야 할 사항들과 관련 설계 식을 유도하였다. 유도된 설계 식으로부터 정해진 회로 정수 값을 이용하여 실험을 실시하였고, IEC1000-3-2의 역률 규제를 만족함을 입증하였다. 본 논문에서 제안된 컨버터를 통하여 기존의 단일 전력 단 컨버터의 문제점인 경 부하 시 높은 직류 링크 전압 문제를 해결할 수 있었다.

• 한국유체기계학회 논문집
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• 제8권4호
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• pp.14-19
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• 2005

Average Bi-directional flow tube was suggested to measure single and two phase flow rate. Its working principle is similar with Pilot tube, however, it makes it possible to eliminate the cooling system which is normally needed to prevent from flashing in the pressure impulse line of Pilot tube when it is used in the depressurization condition. 3-dimensional steady state flow analyses using FLUENT 5.4 code were performed to validate the application of the average bi-directional flow tube in case of water and air flow. In this study, sensitivity studies have been performed to optimize the design features of the average bi-directional flow tube which can be applied for the various experimental conditions. For Re numbers above 1000, the k values are nearly constant regardless of the Re numbers and flow types and calculation results and experimental data coincides quite well. The current FLUENT calculation results suggest that linearity of the k values in various design features of the average BDFT is highly promising, which means that it is quite reasonable to select the typical design of the average BDFT for the convenience of the experimental conditions.

• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 2004년도 유체기계 연구개발 발표회 논문집
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• pp.180-186
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• 2004

Average Bi-directional flow tube was suggested to measure single and two phase flow rate. Its working principle is similar with Pilot tube, however, it makes it possible to eliminate the cooling system which is normally needed to prevent from flashing in the pressure impulse line of Pilot tube when it is used in the depressurization condition. 3-dimensional steady state flow analyses using FLUENT 5.4 code were performed to validate the application of the averagebi-directional flow tube in case of water and air flow In this study, sensitivity studies have been performed to optimize the design features of the average hi-directional flow tube which can be applied for the various experimental conditions. For Re numbers above 1000, the k values are nearly constant regardless of the Re numbers and flow types and calculation results and experimental data coincides quite well. The current FLUENT calculation results suggest that linearity of the k values in various design features of the average BDFT is highly promising, which means that it is quite reasonable to select the typical design of the average BDFT for the convenience of the experimental conditions.

• 유통과학연구
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• 제21권6호
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• pp.1-11
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• 2023

Purpose: As a modern distribution channel, the growth of e-commerce has brought more competitive pressures on e-marketplace, making trust and loyalty become top priority. As one of many sources of trust and loyalty issues, understanding the effect of careless marketing communications on consumers' perception is critical. This study examines the effect of careless marketing communications (e.g. misspellings, incomplete information) in website on consumers' trust toward and confidence in purchasing a product from an e-commerce. Research design and methodology: An experimental research design (with two experimental studies) was used in to test the hypotheses. Study 1 employs a single-factor design and study 2 employs a 2x2, full-factorial, between-subjects design. Results: Results of the two experimental studies (Study 1, n = 60; Study 2, n = 140) demonstrate that simple mistakes significantly decrease consumers' trust toward an e-commerce and their confidence to purchase from the e-commerce. The effect is found to be significant in the case of high-involvement products; whereas no effect is found in low-involvement products. Conclusions: E-commerce relies heavily on carefully crafted marketing communications to establish consumers' trust and confidence. These studies confirm the equal importance of distribution and communication in maintaining consumers' trust and sustainability of the business.