• 대한화학회지
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• 제54권6호
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• pp.818-828
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• 2010

대학수학능력시험(수능)이 1994학년도에 처음 시행된 이후 17년이 지나고 여러 번의 모의평가 출제로 인해 문항의 패턴화, 지식 중심의 출제라는 비판이 제기되고 있다. 이러한 문제에 대한 시사점을 얻기 위해 한국과 마찬가지로 국가 중심 교육과정이며 국가 수준에서 이루어지는 선다형 시험 유형을 가진 일본의 대학입시센터시험(센터시험) 문항을 분석하였다. 이 연구에서는 2009년 1월에 시행한 센터시험의 이과시험에서 화학 문항을 수능과 관련하여 내용 요소 및 행동 영역에 따라 분석하고, 문항 유형과 특이 사항을 분석하였다. 또한 한국 수험생의 관점에서 예상 정답률을 추정하여 수능의 화학 문항 출제에 주는 시사점을 도출하였다.

• 한국컴퓨터정보학회논문지
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• 제19권8호
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• pp.73-81
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• 2014

본 연구에서는 활용 기술로 데이터 저장 레이어, 데이터 처리 레이어, 데이터 분석 레이어, 시각화 레이어 등의 빅 데이터 기술을 활용한 개발 방법을 제안한다, 각 단계에서 저장, 처리, 분석된 데이터는 시각화를 통하여 볼 수 있게 하였다. Hadoop을 통하여 데이터를 처리한 후 처리된 데이터를 Mahout으로 실행하여 분석 결과를 시각화 하였다. 이 과정을 통해서 금융 상품에 가입된 고객의 여러 특성을 파악하였고, 각 고객에 따른 금융 상품의 추천을 적시에 수행할 수 있었다. 본 연구에서는 빅 데이터의 배경 및 문제점을 소개하고, 빅 데이터가 새로운 비즈니스 기회를 어떻게 창출하는지 금융상품 추천 사례를 중심으로 개발 방법과 사례 연구를 논의한다.

• 한국물환경학회지
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• 제25권3호
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• pp.432-440
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• 2009

The effect of selecting hydrologic item for calculating objective function on calibration of stream flow was evaluated by Hydrologic Simulation Porgram-Fortran (HSPF) linked with Model Independent Parameter Optimizer (PEST). Daily and monthly stream flow and flow duration were used to calculate objective function. Automated calibration focused on monthly stream was proper to analyze seasonal or yearly water budget but not proper to predict daily stream flow or percent chance flow exceeded. Calibration result focused on flow duration is proper to predict precent chance flow exceeded but not proper to analyze water budget or predict peak flow. These results indicate that hydrologic item calculated for objective function on calibration procedure could influence calibration results and watershed modeler should select carefully hydrologic item for the purpose of model application. Current, the criteria of stream flow of Korean TMDL is generated based on percent chance flow exceeded, so flow duration should be included to calculate objective function on calibration procedure for the estimation of criteria of stream flow using hydrologic model.

• 컴퓨터교육학회논문지
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• 제6권1호
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• pp.95-107
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• 2003

웹기반 교수 학습이 효과적으로 이루어지기 위해서는 교수-학습 활동이 학습 목표에 도달되었는지를 평가하는 일이 필수적이라 할 수 있다. 기존의 HTML 형식과 파일 형식의 문제은행 시스템은 관리하기가 어렵고, 다향한 형태로 문제를 생성할 수 없으며, 공유를 할 수 없다는 단점이 존재한다. 또한 학습자 수준에 맞는 평가 문제를 제공하기가 힘들다. 이에 반해, XML 문서는 구조화된 정보를 체계적으로 생성하고 관리할 수가 있으며, 기존의 파일 형태 정보에 비하여 의미적인 정보 단위를 구조화하여 표현하기 때문에 문서의 관리 및 검색, 저장에 효과적으로 이용할 수 있다. 따라서, 본 연구에서는 XML을 기반으로 한 웹기반 문제은행 시스템을 설계 및 구현하였으며, 학습자 수준을 분석하여 적절한 평가 문항을 제시함으로서 수준별 개별학습을 지원할 수 있도록 하였다.

• 아동학회지
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• 제32권2호
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• pp.87-104
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• 2011

The purpose of this study was to develop a basic life habit scale for infant early childhood. The participants of this study were composed of 1,000 parents of children aged from two to five years old in the Seoul, Gyeong-gi, and In-cheon areas. For the purposes of data analysis, the study made use of the following methods : descriptive statistics for SES variables, item-analysis, factor analysis for validity, and Cronbach's a for reliability. Most items were acceptable in terms of item response rates, and item discrimination. The results of factor analysis uncovered six factors, and 46 items were selected from a total of 69 items in the original scale. The six factors were (1) safety and rules (2) neatness (3) manners (4) self-help (5) eating habits (6) cleanliness. Cronbach's a value for the reliability of the factors ranged from .76 to .94.of Cooperative Learning. Methods. Westport, CT : Greenwood Press.

• 한국해양공학회지
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• 제24권2호
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• pp.74-81
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• 2010

Ship STEP is the international standard for the exchange of ship modeling data between heterogeneous systems. It is expected that STEP AP218 can be used for seamless data exchange between various CAD/CAM/CAE systems used in the shipbuilding design process. Although the conformance assessment for standards would maximize the performance and confidence about data exchanges, most research has been directed toward interoperability testing. ISO SC4/TC184 only provides the method for conformance testing, and it can be used with test cases on application protocols. Even though standards have been defined for conformance assessment and testing, there is no organization or association. CAD vendors have focused on interoperability testing for evaluation of the performance of their systems. In this paper, the conformance testing criteria for AP218 have been developed with abstract test cases of ship structures. The requested STEP translator was also reviewed with a developed item pool of testing criteria. The criteria methodology would be a guideline for the development of translators and interfaces. The item pool method of testing criteria for conformance assessment would increase performance and efficiency of data translators for Ship STEP and other standards.

• 전기학회논문지
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• 제63권12호
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• pp.1637-1639
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• 2014

In the past, the analog protection relays have been widely used for the safety-related systems in the nuclear power plants due to their stability and reliability. Meanwhile, as the high performance digital system has been developed, the digital systems have been adopted in the non-safety systems. However, since the digital systems currently used in the non-safety systems were not developed according to Q-class standard, Commercial Grade Item Dedication (CGID) procedure should be performed in order to apply them to the safety-related system. The purpose of this paper is to describe the CGID procedure including the analysis of the hardware architecture as well as the software embedded in protective relay to apply to the emergency diesel generator in the nuclear power plant. The entire CGID procedure was performed strictly according to the international standard and regulations.

• 한국안전학회지
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• 제31권1호
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• pp.1-6
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• 2016

Severity and frequency of industrial accidents are typically used to assess the "absolute" risk associated with the industrial machines and devices ("items") which are subject to safety certification or self-declaration of conformity. However, the "relative" risk associated with a particular item can further be assessed based on unit severity and unit frequency where the total number of item in use is taken into account. This study first attempts to estimate the total number of each item in use which was recently selected for safety certification or self-declaration of conformity. The appropriateness of such selection is recapitulated based on the relative risk involved. Analysis results indicate that depending on items, the relative risk is differentiated from the absolute risk. Recent selection of items for safety certification or self-declaration of conformity is then revisited for its validity. The relative risk based on unit severity and unit frequency of industrial accidents, together with the absolute risk, may be used to further categorize items for safety certification or self-declaration of conformity in the future.

• 대한가정학회지
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• 제44권1호
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• pp.1-10
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• 2006

The purpose of this study was to develop a scale to access a creative home environment for preschool children and to examine its validity and reliability. The subjects were 296 children aged 5 to 6 years(148 males and 148 females) and their parents. The methods for data analysis included item analysis, factor analysis for construct validity, Pearson correlations between the rating scale for creative characteristics of preschoolers(RSCCP) and this scale for concurrent validity, and Cronbach's ${\alpha}$ for reliability. The 44 items of the scale were found be satisfactory in terms of item response distribution and item discrimination. Four factors were extracted from the factor analysis: the subscales labelled 'respect for the child', 'enriched learning environment', 'stimulation of independence' and 'family pressure'. The concurrent validity of this scale was accessed by computing the correlation measures of RSCCP with this scale. Most coefficients were significant. Cronbach's ${\alpha}$ ranged from.75 to.86 for the 4 subscales and.85 for the total scale.

• 한국터널지하공간학회 논문집
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• 제14권6호
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• pp.683-697
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• 2012

본 논문에서는 쉴드 TBM 터널에서 적용 가능한 리스크 분석 방법을 연구하였다. FTA 방법을 통해 리스크 아이템과 각각의 발생확률을 확인하고 AHP 방법을 통해 각각의 리스크 아이템의 영향도를 구하였다. 마지막으로 각각의 리스크 아이템의 리스크 레벨을 평가할 수 있었다. 개발된 방법을 EPB 쉴드 터널이 사용된 서울 지하철 현장에 적용하여 리스크 분석 결과가 현장 데이터에 부합하는 합리적 결과임을 검증하였다.