• 한국컴퓨터정보학회논문지
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• 제20권2호
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• pp.231-239
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• 2015

본 연구는 교사의 전문 지식 모형인 TPACK을 예비 교사 교육 프로그램에 적용하고, 그 결과를 분석한 것이다. 이를 위해 테크놀로지 지식을 향상시킬 수 있는 강의를 설계하여 적용하였고, 이를 수강한 예비교사 A 그룹과 기존의 ICT 활용 강의를 수강한 B 그룹을 대상으로 설문을 실시하였다. 두 집단의 설문 결과를 통계 분석한 결과, 본 연구의 강의를 수강한 예비교사에게서 TPACK의 구성 요소인 테크놀로지 지식, 테크놀로지 내용지식, 테크놀로지 교수지식, 테크놀로지 교수내용지식이 향상된 것을 확인할 수 있었다. 또한 상관관계 분석에서도 7개의 세부 지식들이 모두 유의미한 정적 상관관계를 나타내었다. 이를 통해 TPACK 모형의 테크놀로지 지식이 예비교사 교육 프로그램에 적용되어야 함을 제안하였다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1999년도 학회창립 10주년 기념 1999년도 가을 학술발표회 논문집
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• pp.487-490
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• 1999

Nowadays, the pushover analysis technique is becoming a very useful tool for the prediction of inelastic behavior of structures in the seismic evaluation of existing buildings in the world. However, the reliability of this analysis method has not been fully checked by the test results. The objective of this study is to verify the correlation between the analytical and experimental response of a high-rise masonry infilled reinforced concrete frame using DRAIN-2DX program and the test results performed previously. This study concludes that the strength and stiffness of members can be predicted with quite high reliability while the ductility capacity of members can not be described reasonably.

• 대한안전경영과학회지
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• 제14권2호
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• pp.103-112
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• 2012

The construction industry in Korea after the Korean-war has evolved until these days. But the construction industry accident severity rate and frequency is over then the All industry rate. This study analyzed the 'Disaster Statistical Yearbook' of the Korea Occupational Safety and Health Agency, based on the factors that affect construction accidents that is selected and fined the some factors the construction Disaster Prevention Factors. This study will develop the methodology for analyzes that the national qualification is effected to the construction industrial machine disaster prevention status. It suggest two ways to the establishment of disaster trends. First way is the disaster quantitative analysis and second way is comparing the statistical data and the analysis of expert opinion.

• 한국공간구조학회논문집
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• 제16권2호
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• pp.47-54
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• 2016

It is very important to calculate natural frequency of the observatory tower correctly because it is keenly affected by wind response vibration due to its large slenderness ratio, weight and small damping ratio. Additionally, suggestion equation of natural frequency being used in the design phase has considerable difference between actual measured value thereby making it inappropriate to be used in the serviceability design of the observatory tower. Therefore, this paper conducted an ambient vibration measuring on 10 observatory towers through mobile-phone application thereby calculating the natural frequency and comparing the result with the domestic and foreign standards and that of the eigen-value analysis. This paper suggested approximate equation of the natural frequency of the observatory tower; T=0.0266H. The square of the corelation coefficient is 0.940, which is high.

• 전기학회논문지P
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• 제65권3호
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• pp.204-209
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• 2016

It is difficult to establish accurate modeling of PV power system because of various uncertainty. However, it is important work to modeling of PV for fault diagnosis. This paper proposes modeling and fault diagnosis method using correlation analysis and ELM(Extreme Learning Machine). Rather than using total data, we select optimal time interval with higher corelation between PV power and solar irradiation. Also, we use average value during 60 minute to avoid rapid variation of PV power. To show the effectiveness of the proposed method, we performed various experiments by dataset.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2009년도 제38회 동계학술대회 초록집
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• pp.461-461
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• 2010

For a low dielectric constant inter-metal dielectric application, the low-k SiCOH film with a dielectric constant of 2.8-3.2 has been deposited by plasma-enhanced chemical vapor deposition with decamethylcyclopentasiloxane, cyclohexane, and helium which is carrier gas. In this work, we investigated chemical deposition rate, dielectric constant, characterization of plasma polymer films according to temperature(25C-200C) of substrate and change of component concentration. We measured impedance by using V-I prove during process. From experimental result, deposition rate decrease with increasing temperature. Through real time impedance analysis of chamber, we find corelation between film thickness and impedance by assuming equivalent circuit.

• 한국관개배수논문집
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• 제18권1호
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• pp.25-32
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• 2011

In order to effectively manage the reservoir, reservoir water quality management should be based on physicochemical and configurational characteristics. In this research, correlation between factors affecting the reservoir water quality was examined. Chl-a and COD shows the highest positive correlation. Chl-a and T-P also has a high positive correlation, however Chl-a and T-N show lower correlation relatively. Even though T-N is an important factor for phytoplankton growth which increase Chl-a concentration, corelation of Ch1-a and T-N shows that enough nitrogen in the reservoir isn't no longer limiting factor. The age of reservoir can cause of increasing COD and SS. Embankment height and elevation of reservoirs shows strong negative correlation to water quality. That means reservoir which is higher embankment height and locate in higher elevations is less contaminated. Regression expression was derived with Chl-a and water quality parameters, and height of reservoir. Finally Chl-a was simulated using regression expression and it was a good approach to predict the Chl-a concentration.

• 한국안전학회지
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• 제30권5호
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• pp.52-58
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• 2015

Although lots of safety inspection and precision safety diagnosis have been conducted on concrete retaining wall, there is no comprehensive analysis on the basis of the accumulated data associated with the statistic. Especially, the concentrated management is necessary on the evaluation items that cause critical damages for the efficient performance. In this regard, this study conducted a correlation analysis between the 18 condition evaluation items and defect index for the concrete retaining wall as well as how each item affects the final defect index as much as in the manual. As a result, correlation coefficient between sliding and overturning was 0.601, which means that they have a strong correlation, and the most influential item on defect index is the condition of drainage that scored the 0.750 correlation coefficient. In addition, as a result of regression analysis, the condition of drainage with the 0.683 correlation coefficient has a strong correlation with the defect index. If the condition evaluation items are integrated or readjusted based on the results of the statistical analysis in this study, the more efficient and accurate maintenance will be possible.

• 한국터널지하공간학회 논문집
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• 제16권6호
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• pp.521-531
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• 2014

이 논문은 케이블 인발하중이 작용하는 현수교의 지중정착식 앵커리지 캐번 터널에 대한 거동과 관련된 연구이다. 수치해석 결과와 이중곡선 관계식에 의한 추정식에서 얻어진 극한인발저항력($P_u$) 결과와 비교를 통하여 앵커리지 거동, 앵커리지 설계 방법, 파괴면의 각도, ${\delta}$ 등을 분석하였다. 연구결과 $P/{\gamma}/H$와 변위와의 선형 상관관계, $P_u/{\gamma}/H$와 H/b와의 선형 상관관계를 활용하면 앵커리지 캐번 터널의 설치 심도를 쉽게 결정 할 수 있을 것으로 나타났다. 또한 수치해석에 의한 최대전단변형률 분포도와 소성영역 분포도를 분석한 결과 지반파괴 형태는 현재 사용되는 지반 콘 보델 보다는 원호모델에 더 가까운 것으로 나타났다. 이 연구에서는 계산이 간편하도록 원호모델을 단순화한 이중곡선 모델을 제안하였다. 수치해석 결과로부터 얻어진 평균 파괴각을 이중곡선 모델에 적용한 결과, 이중곡선 모델을 적용한 추정식에서 얻어진 극한인발저항력은 수치해석에서 얻어진 극한인발저항력 결과와 잘 일치하는 것으로 나타났다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.1905-1913
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• 2011

The dynamic characteristic of bogie that is driving system of railway vehicle is very important regarding decision of vehicle characteristics as running safety and comport. The dynamic characteristic test of bogie is tested on full size in place on field testing on track. But, the testing on the full size caused many problems. To overcome these problem by full size test, the Railway Safety Research Center in Seoul National University of Science & Technology developed 1/5 scale size of small scale derailment simulator and is currently testing running stability of 1/5 scaled bogie. Also To take effectively advantage of running stability test using small scale derailment simulator in actuality design and reliability estimation, it is necessary comparison and examination with field test and theoretical analysis result In this paper. to achieve running stability analysis of 1/5 scaled bogie on small scale derailment. the program using MATLAB that is fast compose and analysis the motion equation of Saemaul power bogie is developed. It is achieved analysis according to various specification (weight, size, suspension, etc..) and is evaluated corelation between test result and dynamic characteristic of actual railway vehicle.