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( Rui Hao ),( Yan Qiang ),( Xiaolei Liao ),( Xiaofei Yan ),( Guohua Ji ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.1
In the computer-aided detection (CAD) system of pulmonary nodules, a high false positive rate is common because the density and the computed tomography (CT) values of the vessel and the nodule in the CT images are similar, which affects the detection accuracy of pulmonary nodules. In this paper, a method of automatic detection of pulmonary nodules based on multi-scale enhancement filters and 3D shape features is proposed. The method uses an iterative threshold and a region growing algorithm to segment lung parenchyma. Two types of multi-scale enhancement filters are constructed to enhance the images of nodules and blood vessels in 3D lung images, and most of the blood vessel images in the nodular images are removed to obtain a suspected nodule image. An 18 neighborhood region growing algorithm is then used to extract the lung nodules. A new pulmonary nodules feature descriptor is proposed, and the features of the suspected nodules are extracted. A support vector machine (SVM) classifier is used to classify the pulmonary nodules. The experimental results show that our method can effectively detect pulmonary nodules and reduce false positive rates, and the feature descriptor proposed in this paper is valid which can be used to distinguish between nodules and blood vessels.
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Optical absorption of a hydrogenic impurity in a disc-shaped quantum dot
Ruihao Wei,Wenfang Xie 한국물리학회 2010 Current Applied Physics Vol.10 No.3
Using the perturbation method and the effective-mass approximation, we studied a hydrogenic impurity confined in a disc-shaped quantum dot with a parabolic potential in the presence of an electric field. Both the electric field and the confinement effects on the transition energy and the oscillator strength were investigated. Based on the computed energies and wave functions, the linear, the third-order nonlinear and the total optical absorption coefficients were also calculated. The results show that the optical absorption coefficients obtained in a disc-shaped parabolic QD can reach the magnitude of 104/cm, which is 1–2 orders of magnitude higher than that in the case of a spherical parabolic QD. We found that the transition energy, the oscillator strength, the linear, the third-order nonlinear and the total optical absorptions of the hydrogenic impurity in a disc-shaped QD dependent strongly on the confinement strength, and the applied electric field intensity.
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Deqing Xue,Ruihao Yuan,Dezhen Xue,Yumei Zhou,Guojun Zhang,Xiangdong Ding,Jun Sun 한국물리학회 2018 Current Applied Physics Vol.18 No.7
The damping and transformation behaviors of Ti50(Pd50−xCrx) shape memory alloys with x ranging from 4.0 to 5.0 are systematically investigated. The damping capacity (Q−1) at the martensitic transformation is found to be inversely proportional to the square root of frequency, i.e., Q−1∝ω−0.5. A relaxation peak or shoulder is observed slightly below the martensitic transformation damping peak for compositions within the compositional crossover region (4.5 ⩽x⩽ 4.8). Furthermore, the damping capacity at the martensitic transformation is smaller within the compositional crossover region (4.5 ⩽x⩽ 4.8), compared with that of compositions at both sides (x = 4.0 and x = 5.0). These observations can be ascribed to the hysteretic motion of interfaces between different phases near the compositional crossover region.
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Experimental study on the condensation of sonic steam in the underwater environment
Zhaoming Meng,Wei Zhang,Jiazhi Liu,Ruihao Yan,Geyu Shen 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.4
Steam jet condensation is of great importance to pressure suppression containment and automaticdepressurization system in nuclear power plant. In this paper, the condensation processes of sonic steamjet in a quiescent subcooled pool are recorded and analyzed, more precise understanding are got in directcontact condensation. Experiments are conducted at atmospheric pressure, and the steam is injected intothe subcooled water pool through a vertical nozzle with the inner diameter of 10 mm, water temperaturein the range of 25e60 C and mass velocity in the range of 320e1080 kg/m2s. Richardson number iscalculated based on the conservation of momentum for single water jet and its values are in the range of0.16e2.67. There is no thermal stratification observed in the water pool. Four condensation regimes areobserved, including condensation oscillation, contraction, expansion-contraction and double expansioncontractionshapes. A condensation regime map is present based on steam mass velocity and watertemperature. The dimensionless steam plume length increase with the increase of steam mass velocityand water temperature, and its values are in the range of 1.4e9.0. Condensation heat transfer coefficientdecreases with the increase of steam mass velocity and water temperature, and its values are in the rangeof 1.44e3.65 MW/m2 C. New more accurate semi-empirical correlations for prediction of the dimensionlesssteam plume length and condensation heat transfer coefficient are proposed respectively. Thediscrepancy of predicted plume length is within ± 10% for present experimental results and ± 25% forprevious researchers. The discrepancy of predicted condensation heat transfer coefficient is with ± 12%.
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Development of analysis program for direct containment heating
Jiang Herui,Shen Geyu,Meng Zhaoming,Li Wenzhe,Yan Ruihao 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.8
Direct containment heating (DCH) is one of the potential factors leading to early containment failure. DCH is closely related to safety analysis and containment performance evaluation of nuclear power plants. In this study, a DCH prediction program was developed to analyze the DCH loads of containment vessel. The phenomenological model of debris dispersal, metal oxidation reaction, debris-atmospheric heat transfer and hydrogen jet burn was established. Code assessment was performed by comparing with several separate effect tests and integral effect tests. The comparison between the predicted results and experimental data shows that the program can predict the key parameters such as peak pressure, temperature, and hydrogen production in containment well, and for most comparisons the relative errors can be maintained within 20%. Among them, the prediction uncertainty of hydrogen production is slightly larger. The analysis shows that the main sources of the error are the difference of time scale and the oxidation of cavity debris
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