• 대한수학교육학회지:수학교육학연구
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• 제13권3호
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• pp.383-401
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• 2003

본 논문에서는 TIMSS-R 국제성취수준에 따라 우리나라 학생들의 성취도를 살펴보았을 때 나타나는 특징에 대해 조사하고자 한다. 본 논문에서 살펴볼 구체적인 내용은, 첫째, TIMSS-R에서 설정한 국제성취수준 상위 10%, 상위 25%, 상위 50%. 하위 25%에 비추어 볼 때 나타나는 우리나라 학생들의 수학 성취도의 특징과 수학적 능력을 조사하는 것이다. 둘째, TIMSS-R에서 설정한 각각의 국제성취 수준별 예시문항에 대한 우리나라 학생들의 정답률과 오답 유형을 교육과정과 교과서와의 관련성을 중심으로 살펴보는 것이다. 이러한 분석을 통해서 우리나라 학생들의 성취도가 미흡한 수학 주제는 어떤 것이며 그 원인은 무엇인가를 조사함으로써 수학교육에 시사점을 도출하고자 한다.

• 품질경영학회지
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• 제30권4호
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• pp.26-43
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• 2002

This study was conducted to identify the differences in service quality between Incheon and Kimpo international airports and critical factors influencing satisfaction of their customers. According to the results of the study, all service quality factors of Incheon international airport except the service factor of geographical location were better than those of Kimpo international airport. However, all service quality factors of the two airports were evaluated inferior to those of American, western European and Japanese international airports. In addition the service quality factors such as response, safety, airport facility and geographical location were found as critical factors influencing satisfaction of the airport customers. The service quality factor of geographical location of Incheon international airport was measured much inferior comparing with other service quality factors. Thus, the results of this study suggest that the Korean government deliberate and benchmark the international airports of western Europe and the USA in determining the geographical location when planning new international airports.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 1993년도 Fifth International Fuzzy Systems Association World Congress 93
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• pp.941-944
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• 1993

In this paper, we present an international benchmark used in the adaptive control specialist community in order to evaluated the fuzzy control performances. Before solving the corresponding problems, we introduce some improvements on a classic fuzzy controller in order to consider high order systems and time delays. At the end of this paper, the simulation results obtained with the extended Fuzzy Controller will be compared with those obtained with a Supervised Adaptive Controller.

• 한국과학교육학회지
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• 제26권2호
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• pp.246-257
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• 2006

TIMSS 2003에서는 교육과정과 교수 학습 개선에 도움이 되는 구체적인 정보를 제공하기 위하여 전체 과학 성취점수를 수윌, 우수, 보통, 기초 4개의 수준으로 구분하여 각 성취수준에 해당하는 학생이 무엇을 알고, 무엇을 할 수 있는지를 제시하고 있다. 이 연구에서는 수윌 수준과 우수 수준을 중심으로 우리나라 중학생들의 과학 내용 영역별 성취도 경향 및 문항별 정답률 분포와 특성을 분석하였다. 수월 수준 문항들의 정답률을 내용 영역별로 살펴보면, 우리나라의 평균 정답률은 물리, 지구과학, 생물, 화학, 환경의 순으로 높았다. 반면에 국제 평균 정답률은 지구과학, 화학, 생물, 물리, 환경의 순으로 높았다. 우수 수준에서 우리나라의 경우에는 환경, 물리, 생물, 지구과학, 화학의 순으로 평균 정답률이 높게 나타난 반면에 국제 평균 정답률은 지구과학, 생물, 환경, 물리, 화학의 순으로 높았다. 수윌 수준과 우수 수준에 해당되는 문항들의 정답률을 내용 영역별로 살펴본 결과, 우리나라 학생들은 물리 영역에서 강세를 나타내었고 화학영역은 상대적으로 약세를 나타내었다. 각 수준에 해당하는 문항들 중 정답률이 높거나 낮은 문항들의 특성을 분석한 결과, 수윌 수준에서 우리나라 학생들은 기본적인 과학 탐구에 대한 이해도는 높으나, 과학 지식을 글로 설명하거나 복합적이고 추상적인 과학 개념을 이해하는 것, 그리고 과학 원리를 적용하여 정량적으로 문제를 해결하는 것에서는 취약한 것으로 나타났고, 우수 수준에서는 생태계에 대한 이해 정도가 국제 수준에 비해 상대적으로 취약한 것으로 나타났다. 이러한 결과를 바탕으로 우리나라 과학과 교육과정 및 교수 학습에 주는 시사점을 도출하였다.

• KIEE International Transactions on Power Engineering
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• 제5A권3호
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• pp.207-213
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• 2005

This paper deals with the development of benchmark systems based on the Korea Electric Power Corporation (KEPCO) system. A novel procedure for constructing a dynamic equivalent system of the KEPCO system is proposed. By using such a system, various scenarios can be simulated and compared with the original system. The results of the simulation show the benefits of the proposed equivalent system and its validity is confirmed by applying it to the KEPCO system.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 1997년도 춘계학술발표회논문집(1)
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• pp.39-44
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• 1997

The International Criticality Safety Benchmark Evaluation Project (ICSBEP) is under way for the purpose identifying, evaluating, and compiling benchmark critical experiment data into a standardized format that allows criticality analysts to easily use the data to validate calculational methods and cross sections. As part of this activity, PNL30-35 experiments, which had been adopted as benchmark problems by CSEWG in 1970s, were reevaluated, which results in some additions and modifications: changes in fuel number density, modification to the experimental keff, modifications to the soluble boron concentration for PNL-31, and addition of an uncertainty in the benchmark-model k$_{eff}$./.

• Nuclear Engineering and Technology
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• 제53권1호
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• pp.19-29
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• 2021

This paper presents the validation of the MCS code for critical safety analysis with burnup credit for the spent fuel casks. The validation process in this work considers five critical benchmark problem sets, which consist of total 80 critical experiments having MOX fuels from the International Criticality Safety Benchmark Evaluation Project (ICSBEP). The similarity analysis with the use of sensitivity and uncertainty tool TSUNAMI in SCALE was used to determine the applicable benchmark experiments corresponding to each spent fuel cask model and then the Upper Safety Limits (USLs) except for the isotopic validation were evaluated following the guidance from NUREG/CR-6698. The validation process in this work was also performed with the MCNP6 for comparison with the results using MCS calculations. The results of this work showed the consistence between MCS and MCNP6 for the MOX fueled criticality benchmarks, thus proving the reliability of the MCS calculations.

• Nuclear Engineering and Technology
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• 제53권8호
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• pp.2445-2453
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• 2021

Since the nuclear data forms a vital component in reactor physics computations, the nuclear community needs processing codes as tools for translating the Evaluated Nuclear Data Files (ENDF) to simulate nuclear-related problems such as an ACE format that is used for MCNP. Errors, inaccuracies or discrepancies in library processing may lead to a calculation that disagrees with the experimentally measured benchmark. This paper provides an overview of the processing and preparation of ENDF/B-VIII.0 incident neutron data with NECP-Atlas and NJOY codes for implementation in the MCNP code. The resulting libraries are statistically inter-compared and tested by conducting benchmark calculations, as the mutualcomparison is a source of strong feedback for further improvements in processing procedures. The database of the benchmark experiments is based on a selection taken from the International Handbook of Evaluated Criticality Safety Benchmark Experiments (ICSBEP handbook) and those proposed by Russell D. Mosteller. In general, there is quite good agreement between the NECP-Atlas1.2 and NJOY21^(1.0.0.json) results with no substantial differences, if the correct input parameters are used.

• International Journal of Internet, Broadcasting and Communication
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• 제13권1호
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• pp.180-186
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• 2021

In cloud computing service it is important to share the system resource among multiple instances according to user requirements. In particular, the issue of efficiently distributing I/O resources across multiple instances is paid attention due to the rise of emerging data-centric technologies such as big data and deep learning. However, it is difficult to evaluate the I/O resource distribution of a Linux container, which is one of the core technologies of cloud computing, since conventional I/O benchmarks does not support features related to container management. In this paper, we propose a new I/O performance benchmarking framework that can easily evaluate the resource distribution of Linux containers using existing I/O benchmarks by supporting container-related features and integrated user interface. According to the performance evaluation result with trace-replay benchmark, the proposed benchmark framework has induced negligible performance overhead while providing convenience in evaluating the I/O performance of multiple Linux containers.

• International Journal of Aeronautical and Space Sciences
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• 제3권2호
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• pp.46-58
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• 2002

An inverse method is introduced to construct benchmark problems for the numerical solution of initial value problems. Benchmark problems constructed through this method have a known exact solution, even though analytical solutions are generally not obtainable. The solution is constructed such that it lies near a given approximate numerical solution, and therefore the special case solution can be generated in a versatile and physically meaningful fashion and can serve as a benchmark problem to validate approximate solution methods. A smooth interpolation of the approximate solution is forced to exactly satisfy the differential equation by analytically deriving a small forcing function to absorb all of the errors in the interpolated approximate solution. A multi-variable orthogonal function expansion method and computer symbol manipulation are successfully used for this process. Using this special case exact solution, it is possible to directly investigate the relationship between global errors of a candidate numerical solution process and the associated tuning parameters for a given code and a given problem. Under the assumption that the original differential equation is well-posed with respect to the small perturbations, we thereby obtain valuable information about the optimal choice of the tuning parameters and the achievable accuracy of the numerical solution. Illustrative examples show the utility of this method not only for the ordinary differential equations (ODEs) but for the partial differential equations (PDEs).