Open Access
EDITORIAL
Shunying Ji1,*, Michael Zhuravkov2, Zongyan Zhou3, Yuntian Feng4
CMES-Computer Modeling in Engineering & Sciences, Vol.132, No.1, pp. 1-3, 2022, DOI:10.32604/cmes.2022.023238
（This article belongs to this Special Issue: Computational Mechanics of Granular Materials and its Engineering Applications)
Abstract This article has no abstract. More >
Open Access
ARTICLE
Hongri Zhu, Shunying Ji*
CMES-Computer Modeling in Engineering & Sciences, Vol.132, No.1, pp. 5-21, 2022, DOI:10.32604/cmes.2022.019991
（This article belongs to this Special Issue: Computational Mechanics of Granular Materials and its Engineering Applications)
Abstract Moored structures are suitable for operations in ice-covered regions owing to their security and efficiency. This
paper aims to present a new method for simulating the ice load and mooring force on the moored structure
during ice-structure interaction with a spherical Discrete Element Method (DEM). In this method, the level ice
and mooring lines consist of bonded sphere elements arranged in different patterns. The level ice model has been
widely validated in simulation of the ice load of fixed structures. In the mooring line simulation, a string of spherical
elements was jointed with the parallel bond model to simulate the… More >
Open Access
ARTICLE
Xiaojun Huang1,2, Liaojun Zhang1,*, Renyu Ge2, Hanbo Cui2, Zhedong Xu2
CMES-Computer Modeling in Engineering & Sciences, Vol.132, No.1, pp. 23-41, 2022, DOI:10.32604/cmes.2022.019765
Abstract In the current research, an effective differential quadrature method (DQM) has been developed to solve natural frequency and vibration modal functions of circular section beams along radial functional gradient. Based on the high-order theory of transverse vibration of circular cross-section beams, lateral displacement equation was reconstructed neglecting circumferential shear stress. Two equations coupled with deflection and rotation angles were derived based on elastic mechanics theory and further simplified into a constant coefficient differential equation with natural frequency as eigenvalue. Then, differential quadrature method was applied to transform the eigenvalue problem of the derived differential equation into a set of algebraic… More >
Open Access
ARTICLE
Yuya Hanaoka1,*, Taku Itoh2, Kohei Tateyama3, Susumu Nakata4, Keiko Watanabe3
CMES-Computer Modeling in Engineering & Sciences, Vol.132, No.1, pp. 43-53, 2022, DOI:10.32604/cmes.2022.016831
Abstract This study evaluates the performance of a model of open-cell metal foams generated by sphere functions. To this end, an electromagnetic shield constructed from the model was inserted between two horn antennas in an electromagnetic wave propagation simulation. The foam-hole diameter in the electromagnetic shield model was varied as d = 2.5 and 5.0 mm, and the frequency of the electromagnetic waves was varied from 3 to 13 GHz. In the numerical experiments of shield effectiveness, the shields with foam holes of both diameters attenuated the electromagnetic waves across the studied frequency range. The shield effectiveness was enhanced at low… More >
Open Access
ARTICLE
Zhijuan Meng1, Yanan Fang1, Yumin Cheng2,*
CMES-Computer Modeling in Engineering & Sciences, Vol.132, No.1, pp. 55-79, 2022, DOI:10.32604/cmes.2022.019828
（This article belongs to this Special Issue: Numerical Methods in Engineering Analysis, Data Analysis and Artificial Intelligence)
Abstract In this paper, a fast element-free Galerkin (FEFG) method for three-dimensional (3D) elasticity problems is
established. The FEFG method is a combination of the improved element-free Galerkin (IEFG) method and the
dimension splitting method (DSM). By using the DSM, a 3D problem is converted to a series of 2D ones, and
the IEFG method with a weighted orthogonal function as the basis function and the cubic spline function as the
weight function is applied to simulate these 2D problems. The essential boundary conditions are treated by the
penalty method. The splitting direction uses the finite difference method (FDM), which can… More >
Open Access
ARTICLE
Shouming Hou1, Chaolan Jia1, Kai Li1, Liya Fan2, Jincheng Guo3,*, Mackenzie Brown4,*
CMES-Computer Modeling in Engineering & Sciences, Vol.132, No.1, pp. 81-94, 2022, DOI:10.32604/cmes.2022.019006
（This article belongs to this Special Issue: Computer-Assisted Imaging Processing and Machine Learning Applications on Diagnosis of Chest Radiograph)
Abstract Edge detection is an effective method for image segmentation and feature extraction. Therefore, extracting weak
edges with the inhomogeneous gray of Corona Virus Disease 2019 (COVID-19) CT images is extremely important.
Multiscale morphology has been widely used in the edge detection of medical images due to its excellent boundary
detection accuracy. In this paper, we propose a weak edge detection method based on Gaussian filtering and singlescale Retinex (GF_SSR), and improved multiscale morphology and adaptive threshold binarization (IMSM_ATB).
As all the CT images have noise, we propose to remove image noise by Gaussian filtering. The edge of CT images is… More >
Open Access
ARTICLE
Yalan Gao, Yanqiong Zhang, Xianwei Jiang*
CMES-Computer Modeling in Engineering & Sciences, Vol.132, No.1, pp. 95-117, 2022, DOI:10.32604/cmes.2022.019970
（This article belongs to this Special Issue: Computer-Assisted Imaging Processing and Machine Learning Applications on Diagnosis of Chest Radiograph)
Abstract (Aim) Chinese sign language is an essential tool for hearing-impaired to live, learn and communicate in deaf
communities. Moreover, Chinese sign language plays a significant role in speech therapy and rehabilitation. Chinese
sign language identification can provide convenience for those hearing impaired people and eliminate the communication barrier between the deaf community and the rest of society. Similar to the research of many biomedical
image processing (such as automatic chest radiograph processing, diagnosis of chest radiological images, etc.),
with the rapid development of artificial intelligence, especially deep learning technologies and algorithms, sign
language image recognition ushered in the spring. This… More >
Open Access
ARTICLE
Rabha W. Ibrahim1,*, Hayder Natiq2, Ahmed Alkhayyat3, Alaa Kadhim Farhan4, Nadia M. G. Al-Saidi5, Dumitru Baleanu6,7,8
CMES-Computer Modeling in Engineering & Sciences, Vol.132, No.1, pp. 119-131, 2022, DOI:10.32604/cmes.2022.018343
（This article belongs to this Special Issue: Trend Topics in Special Functions and Polynomials: Theory, Methods, Applications and Modeling)
Abstract In this study, a new algorithm of fractional beta chaotic maps is proposed to generate chaotic sequences for image
encryption. The proposed technique generates multi random sequences by shuffling the image pixel position.
This technique is used to blur the pixels connecting the input and encrypted images and to increase the attack
resistance. The proposed algorithm makes the encryption process sophisticated by using fractional chaotic maps,
which hold the properties of pseudo-randomness. The fractional beta sequences are utilized to alter the image pixels
to decryption attacks. The experimental results proved that the proposed image encryption algorithm successfully
encrypted and decrypted… More >
Open Access
ARTICLE
Cristina B. Corcino1,2, Wilson D. Castañeda Jr.3, Roberto B. Corcino1,2,*
CMES-Computer Modeling in Engineering & Sciences, Vol.132, No.1, pp. 133-151, 2022, DOI:10.32604/cmes.2022.019965
（This article belongs to this Special Issue: Trend Topics in Special Functions and Polynomials: Theory, Methods, Applications and Modeling)
Abstract The tangent polynomials Tn (z) are generalization of tangent numbers or the Euler zigzag numbers Tn. In particular, Tn (0) = Tn. These polynomials are closely related to Bernoulli, Euler and Genocchi polynomials. One of the
extensions and analogues of special polynomials that attract the attention of several mathematicians is the Apostoltype polynomials. One of these Apostol-type polynomials is the Apostol-tangent polynomials Tn(z, λ). When
λ = 1, Tn (z, 1) = Tn(z). The use of hyperbolic functions to derive asymptotic approximations of polynomials
together with saddle point method was applied to the Bernoulli and Euler polynomials by Lopez and… More >
Open Access
ARTICLE
Fei Liu1,2, Yunkai Zhang1,2, Jian Zhang3,*
CMES-Computer Modeling in Engineering & Sciences, Vol.132, No.1, pp. 153-172, 2022, DOI:10.32604/cmes.2022.017967
（This article belongs to this Special Issue: Reinventing Digitalization with Digital Twin Technology)
Abstract A core element of the sustainable approach to global living quality improvement can now become the intensive
and organized usage of underground space. There is a growing interest in underground building and growth
worldwide. The reduced consumption of electricity, effective preservation of green land, sustainable wastewater
and sewage treatment, efficient reverse degradation of the urban environment, and reliable critical infrastructure
management can improve the quality of life. At the same time, technological innovations such as artificial
intelligence (AI), cloud computing (CC), the internet of things (IoT), and big data analytics (BDA) play a
significant role in improved quality of life.… More >
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