Advance and Prospects of AdaBoost Algorithm

Cao, Ying; Miao, Qiguang; Liu, Jiachen; Gao, Lin

doi:10.1016/s1874-1029(13)60052-x

Cited by 259 publications

(66 citation statements)

References 53 publications

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“…It should be noted that reports on the crystal structure of the plate-like grain boundary phase in Allvac 718Plus are not fully resonant. The phase is attributed to being the orthorhombic δ-phase [14,15] (typical for Alloy 718) as well as an hexagonal structure [16,17]. Nevertheless, the heat treatment was performed as follows, with water quenching (WQ) and furnace cooling (FC) between steps: 1040 °C /1h (WQ) + 788 °C/8h (FC) + 704 °C /8h (FC).…”

Section: Experimental Materialsmentioning

confidence: 99%

Intergranular crack tip oxidation in a Ni-base superalloy

et al. 2013

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High temperature intergranular crack tip oxidation under a single 600 s long sustained tensile load at 700 °C was studied for the Ni-base superalloy Allvac 718Plus. High-resolution analytical techniques showed oxidation to take place at and immediately ahead of the tip of an open crack, forming a closed but layered oxide structure about the prior (now oxidized) grain boundary. Near the prior grain boundary the oxide is Ni-rich with a Co-enriched layer furthest away from the metal and a Feenriched region below this. A Cr-rich oxide is present below the outer Ni-rich oxides throughout the crack, also in the direction of crack growth. This is believed to have a hindering effect on oxidation ahead of the crack. Ni 3 (Nb,Al) γ' precipitates close to the grain boundaries were found to oxidize and form regions of near-stoichiometric NiO within the oxide layers. Remaining constituents of γ' (e.g. Al and Nb) were found to be enriched in the surrounding oxidized matrix and also to produce thin oxide layers near the interface between unoxidized metal and the Cr-rich oxide. The formation of the crack tip oxides is discussed with regard to thermodynamics, kinetics and the influence of applied mechanical load.

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Section: Experimental Materialsmentioning

confidence: 99%

Intergranular crack tip oxidation in a Ni-base superalloy

et al. 2013

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“…The basic AdaBoost algorithm can only handle binary classification problems. On this basis, Schapire (1990) proposed a series of derivative algorithms in which the AdaBoost.M1 algorithm can handle multiple classification problems (Cao et al, 2013). The process for the AdaBoost.…”

Section: Adaboost Series Classifiersmentioning

confidence: 99%

Safety Risk Evaluations of Deep Foundation Construction Schemes Based on Imbalanced Data Sets

Gong

Guo

Huang

et al. 2020

Journal of Civil Engineering and Management

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Safety risk evaluations of deep foundation construction schemes are important to ensure safety. However, the amount of knowledge on these evaluations is large, and the historical data of deep foundation engineering is imbalanced. Some adverse factors influence the quality and efficiency of evaluations using traditional manual evaluation tools. Machine learning guarantees the quality of imbalanced data classifications. In this study, three strategies are proposed to improve the classification accuracy of imbalanced data sets. First, data set information redundancy is reduced using a binary particle swarm optimization algorithm. Then, a classification algorithm is modified using an Adaboost-enhanced support vector machine classifier. Finally, a new classification evaluation standard, namely, the area under the ROC curve, is adopted to ensure the classifier to be impartial to the minority. A transverse comparison experiment using multiple classification algorithms shows that the proposed integrated classification algorithm can overcome difficulties associated with correctly classifying minority samples in imbalanced data sets. The algorithm can also improve construction safety management evaluations, relieve the pressure from the lack of experienced experts accompanying rapid infrastructure construction, and facilitate knowledge reuse in the field of architecture, engineering, and construction.

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“…The integral map can use the same time (constant time) to calculate different features at various scales, thus greatly improving the detection speed. Then the classifiers are trained by the Adaboost algorithm [Cao, Miao, Liu et al (2013)]. each Haar feature weak classifier is trained with the same training set to extract facial features in the image.…”

Section: Face Recognition and Positioningmentioning

confidence: 99%

Non-contact Real-time Heart Rate Measurement Algorithm Based on PPG-standard Deviation

Zou¹,

Chen²,

Yang³

2019

Computers, Materials &Amp; Continua

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Heart rate is an important physiological parameter for clinical diagnosis, it can infer the health of the human body. Thus, efficient and accurate heart rate measurement is important for disease diagnosis and health monitoring. There are two ways to measure heart rate. One is contact type and the other is non-contact. Contact measurement methods include pulse cutting, electrocardiogram, etc. Because of the inconvenience of this method, a non-contact heart rate method has been proposed. Traditional non-contact measurement method based on image is collecting RGB three-channel signals in continuous video and selecting the average value of the green channel pixels as the heart rate signal for processing. However, this method is not accurate when the pixel values are changing greatly. To overcome this problem, non-contact real-time heart rate measurement method is proposed in this paper based on pixel standard deviation. Because of the changes in skin color caused by heart rate, the standard deviation signal of the green channel pixels in the region of interest (ROI) is filtered and extracted by the forward and inverse Fourier transform respectively, measuring the heart rate. The experimental results show that the improved algorithm can measure heart rate with faster speed and higher accuracy comparing to traditional methods. And we hope that our algorithm can apply in intelligent elder caring.

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Advance and Prospects of AdaBoost Algorithm

Cited by 259 publications

References 53 publications

Intergranular crack tip oxidation in a Ni-base superalloy

Intergranular crack tip oxidation in a Ni-base superalloy

Safety Risk Evaluations of Deep Foundation Construction Schemes Based on Imbalanced Data Sets

Non-contact Real-time Heart Rate Measurement Algorithm Based on PPG-standard Deviation

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