• Journal of the Korea Concrete Institute
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• v.16 no.5 s.83
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• pp.677-686
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• 2004

This study deals with literature review, developing a predicting equation for the ultimate stress of internal and external prestressing steel, and an experimental test with the parameters affecting the ultimate stress of prestressing steel in prestressed concrete beams strengthened by external prestressing tendons. The proposed predicting equation takes rationally the effect of internal and external prestressing steels into consideration as a function of prestressing steel depth to neutral depth ratio. In the experimental study, prestressed concrete beams strengthened using external steel tendons are tested with the test parameters having a large effect on the ultimate stress of internal and external prestressing steel. The test parameters include internal and external prestressing steel reinforcement ratio and span to depth ratio. The test results are analyzed to confirm the rationality and applicability of the proposed equation for predicting the ultimate stress of internal and external prestressing steel. This research shows that the results obtained by the proposed equation for predicting the ultimate stress agreed very well with the test results.

• 한국HCI학회:학술대회논문집
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• 2008.02b
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• pp.475-481
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• 2008

본 연구는 어떤 사건에 대한 예측 정확성 여부와 기억을 회상할 때의 정서 상태가 후견지명 편향 (hindsight bias)에 미치는 영향을 알아보고자 하였다. 이에 valence 축에 따라 긍정적 정서와 부정적 정서를 일으키는 두 가지 음악을 제시하고 두 조건에 대하여 기억에 대한 과잉 확신이 얼마나 달라지는가를 분석하였다. 예측 정확성 여부에 대해서는 실험 결과 데이터 중 예측 일치 조건과 불일치 조건으로 나누어 후견지명 편향에 끼치는 영향과 정서와의 상호작용이 있는가를 분석하였다. 사람들은 예측과 반대되는 결과를 접했을 때 결과에 anchoring하여 기억을 회상하려는 편향이 더욱 커졌으며 부정적인 정서보다 긍정적 정서 상태일 때 후견지명 편향이 더욱 커졌음을 밝혔다. 특히 예측과 상이한 결과 피드백을 받고 긍정적 정서 상태일 때 가장 많은 왜곡 현상을 보였으며, 예측 불일치/ 부정적 정서 조건, 예측 일치/ 긍정적 정서 조건, 예측 일치/ 부정적 정서 조건 순으로 후견지명 편향을 보였다. 이 결과는 정서 상태보다 어떤 사건에 대한 예측 정확성 여부가 후견지명 편향에 더 큰 영향을 준다는 것을 시사한다. 본 연구의 실험실 상황을 통하여 자기와 관련이 없는 중립적 과제를 통해서도 후견지명 편향이 나타남을 알 수 있었다. 특히 그 동안 거의 이루어지지 않았던 정서와 후견지명 편향의 관계를 밝히고, 기존의 예측 정확성에 따른 편향을 설명하는 모델간 논쟁이 많았으나 실험 결과가 motivational model을 지지함을 밝혔음에 의의가 있다.

• Journal of Korea Water Resources Association
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• v.30 no.6
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• pp.743-751
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• 1997

A thorough literatural review of researches on the experimental prediction of scour depths caused by jets was carried out to find out a measure of scour prediction. A new experimental equation for predicting scour depths due to a vortical or an inclined jet was developed from five hundreds of experimental data which were carefully reviewed and adopted from the previous researches. The developed equation shows 0.941 statistical correlation coefficient. It was found that the parameters governing the scour depth were the size of bed material, flow rate through unit width of spillway, and head drop across structure. The predicted scour depth could be expressed as the deepest scouring depth below tail water surface with correlation coefficient ${\gamma}$ = 0.941.

• Journal of the Korean Wood Science and Technology
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• v.41 no.6
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• pp.544-550
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• 2013

Tests were carried out on commercial particleboards manufactured in Korea to evaluate and modify formulas which had previously been developed to predict the holding loads of screw on the face and edge of specimen. Screw sizes were No. 6, 8 and 10 used in this study. The withdrawal loads of screws were developed to predict as a function of screw diameter, depth of penetration, specific gravity and IB of particleboard. Predicted equations were fitted to the test results of different length of No. 8 screws. Results of tests indicate that IB is a better predictor of holding loads on the face of particleboard than SG. On the other hand, SG is a good indicator of holding load on the edge of particleboard.

• Journal of the Korean Society of Safety
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• v.20 no.2 s.70
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• pp.162-168
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• 2005

The lower flash points for the n-propanol+n-decane flammable mixture were measured by the Tag open-cup apparatus(ASTM D 1310). The experimental results of mixture exhibited the lower flash point than those of pure component in the flash point versus composition curve. The experimental value of the minimum flash point is $27^{\circ}C$ at a mole fraction of n-propanol of 0.71, and the flash point of n-propanol was $28^{\circ}C$. The experimentally obtained data were compared with the values that had been calculated by use of the prediction model, which assumes an ideal solution, and the flash point prediction models based on the van Laar equation were used to estimate the activity coefficients. The predictive curve based on an ideal solution deviated from the experimental data for this system. The experimental results demonstrate a close agreement with the predicted curves, which used the van Laar equation. The average absolute deviation(A.A.D.) from using the van Lau equation is $0.83^{\circ}C$. The methodology proposed here in this paper can thus be applied to incorporate an inherently safer design for chemical processes, such as determining safe storage and handling conditions for flammable solutions.

• Proceedings of the KIEE Conference
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• 2007.10a
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• pp.441-442
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• 2007

본 논문은 H.264 MB Layer 비트율 제어를 위한 적응적인 MAD 예측 방법을 제안한다. 첫째, 공간 인접 MB 들 간의 유사도를 기반으로 공간예측 MAD를 구하고 둘째, 프레임의 픽셀 평균값의 차이로 장면 전환을 검출한다. 셋째, 공간예측 MAD와 시간예측 MAD에 MB의 예측 움직임 벡터를 이용한 가중치를 주어 적응적으로 MAD를 예측한다. 실험 결과를 통해 제안한 MAD 예측 방법이 JM11.0의 방법보다 더욱 우수한 예측 성능을 보임을 살펴본다.

• Composites Research
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• v.12 no.4
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• pp.1-7
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• 1999

Fatigue life prediction of matrix dominated composite laminates, which have a nonlinear stress/strain response, was studied analytically and experimentally. A stress function describing the relation of initial fatigue modulus and elastic modulus was used in order to consider the material nonlinearty. New modified fatigue life prediction equation was suggested based on the fatigue modulus and reference modulus concept as a function of applied stress. The prediction was verified by torsional fatigue test using crossply carbon/epoxy laminate tubes. It was shown that the proposed equation has wide applicability and good agreement with experimental data.

• Water for future
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• v.20 no.1
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• pp.63-72
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• 1987

This study describes a procedure of movable bed model tests and discusses the similitude with a view to state of the art. The prediction of littoral transport in the vicinity of coastal structure of nuclear power #9, 10 has been attempted. From the result of the present movable model study, it was found that the offshore breakwater is more excellent than the groyne and the rip-current barrier for the prevention against in take siltations and for the stability of investigated coastal structure of nuclear power plant.

• Journal of Advanced Navigation Technology
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• v.22 no.5
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• pp.478-484
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• 2018

This study predicts solar radiation, solar radiation, and solar power generation using hourly weather data such as temperature, precipitation, wind direction, wind speed, humidity, cloudiness, sunshine and solar radiation. I/O pattern in supervised learning is the most important factor in prediction, but it must be determined by repeated experiments because humans have to decide. This study proposed four input and output patterns for solar and sunrise prediction. In addition, we predicted solar power generation using the predicted solar and solar radiation data and power generation data of Youngam solar power plant in Jeollanamdo. As a experiment result, the model 4 showed the best prediction results in the sunshine and solar radiation prediction, and the RMSE of sunshine was 1.5 times and the sunshine RMSE was 3 times less than that of model 1. As a experiment result of solar power generation prediction, the best prediction result was obtained for model 4 as well as sunshine and solar radiation, and the RMSE was reduced by 2.7 times less than that of model 1.

• The Journal of the Acoustical Society of Korea
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• v.33 no.3
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• pp.153-162
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• 2014

Empirical prediction method of the acoustic load on the fairing is based on jet experimental data on the basis of similarity principle. Representative empirical prediction method, DSM-II(Distributed Source Method-II), is a distributing source method along the jet plume. But the empirical prediction model is limited to reflect the impingement source in real environment because it is based on the free jet data. So, we propose a empirical prediction method considering the impinging jet effect by adding a impingement source in the existing prediction method. Considering the additional source's displacement, spectrum, strength and directivity, we calculate the acoustic load on the KSR-III(Korean Sounding Rocket-III) rocket and compare the results with the existing method and experiment data.