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Redha Yeghnem,Hicham Zakaria Guerroudj,Lemya Hanifi Hachemi Amar,Sid Ahmed Meftah,Samir Benyoucef,Abdelouahed Tounsi,El Abbas Adda Bedia 사단법인 한국계산역학회 2017 Computers and Concrete, An International Journal Vol.19 No.5
Creep and shrinkage are the main types of volume change with time in concrete. These changes cause deflection, cracking and stresses that affect durability, serviceability, long-term reliability and structural integrity of civil engineering infrastructure. Although laboratory test may be undertaken to determine the deformation properties of concrete, these are time-consuming, often expensive and generally not a practical option. Therefore, relatively simple empirically design code models are relied to predict the creep strain. This paper reviews the accuracy of creep and shrinkage predictions of reinforced concrete (RC) shear walls structures strengthened with carbon fibre reinforced polymer (CFRP) plates, which is characterized by a widthwise varying fibre volume fraction. This review is yielded by three commonly used international “code type” models. The assessed are the: CEB-FIP MC 90 model, ACI 209 model and Bazant & Baweja (B3) model. The time-dependent behavior was investigated to analyze their seismic behavior. In the numerical formulation, the adherents and the adhesives are all modelled as shear wall elements, using the mixed finite element method. Several tests were used to dem¬onstrate the accuracy and effectiveness of the proposed method. Numerical results from the present analysis are presented to illustrate the significance of the time-dependency of the lateral displacements and eigenfrequencies modes.
Quantification of Hypoxia in Human Glioblastoma using PET with 18F-FMISO
Redha-alla Abdo,Frédéric Lamare,Philippe Fernandez,M’hamed Bentourkia 대한핵의학회 2021 핵의학 분자영상 Vol.55 No.3
Purpose This study aimed to investigate the results of compartmental modeling (CM) and spectral analysis (SA) generated with dynamic 18F-FMISO tumor images. Besides, the regular tissue-to-blood ratio (TBR) images were derived and compared with the dynamic models. Methods Nine subjects with glioblastoma underwent PET/CT imaging with the 18F-FMISO tracer. The protocol for PET imaging began with 15 min in dynamic mode and two 10-min duration static images at 120 min and 180 min post-injection. We used the two-tissue compartmental model for CM at the voxel basis, and we conducted SA to estimate the 18F-FMISO accumulation within each voxel. We also investigated the usual tumor-to-blood ratio (TBR) for comparison. Results The images of the tumor showed different patterns of hypoxia and necrosis as a function of PET scanning times, while CM and SA methods based on dynamic PET imaging equally located tumor hypoxia. The mean correlation of Ki images of all subjects between CM and SA was 0.63 ± 0.19 (0.24-0.86). CM produced less noisy Ki images than SA, and, in the contrary, SA produced accumulation component images more clear than with CM. CM-Ki and SA-Ki images were correlated with TBR images (r = 0.72 ± 0.20 and 0.56 ± 0.26, respectively). In the only subject having a continuously increasing tumor time-activity curve, the k3 image showed a high uptake in the necrosis region which was not apparent in TBR or Ki images. Conclusion Based on these results, the combination of CM and SA approaches was found more appropriate in generating voxelbased hypoxia images.
Duplicate Audio Data Detection Model Based on IPFS and Blockchain using Smart Contract
Muhammad Rasyid Redha Ansori,Allwinnaldo,Revin Naufal Alief,Ikechi Saviour Igbonausi,Jae Min Lee,Dong-Seong Kim 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
This paper proposes a model to detect a duplication of audio data to address the problem of copyright infringement using smart contract based on IPFS and Ethereum blockchain. The proposed model is tested with calculating its transaction fee and response time. The results show that the most expensive fee is when deploying the smart contract to the network and the total response time is only about 2 seconds.
A Robust MP3 Compression-Resistant Audio Watermarking Algorithm Based on DWT-SMM
Muhammad Rasyid Redha Ansori,Simeon Okechukwu Ajakwe,Jae Min Lee,Dong-Seong Kim 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.11
Watermarking is one solution to the problem of digital piracy. This paper proposed an audio watermarking approach using Discrete Wavelet Transform (DWT) and Statistical Mean Manipulation (SMM). The proposed method is tested using three different audio hosts and attacked with MP3 compression with 32Kbps bit rate. The results show that watermark can retain against MP3 compression with 0 BER and the proposed system produces a good quality watermarked audio with best SNR 29.8088 dB.
Hicham Zakaria Guerroudj,Redha Yeghnem,Redha Yeghnem,Abdelhakim Kaci,Fatima Zohra Zaoui,Samir Benyoucef,Abdelouahed Tounsi 국제구조공학회 2018 Smart Structures and Systems, An International Jou Vol.22 No.1
This research investigates the free vibration analysis of advanced composite plates such as functionally graded plates (FGPs) resting on a two-parameter elastic foundations using a hybrid quasi-3D (trigonometric as well as polynomial) higher-order shear deformation theory (HSDT). This present theory, which does not require shear correction factor, accounts for shear deformation and thickness stretching effects by a sinusoidal and parabolic variation of all displacements across the thickness. Governing equations of motion for FGM plates are derived from Hamilton’s principle. The closed form solutions are obtained by using Navier technique, and natural frequencies are found, for simply supported plates, by solving the results of eigenvalue problems. The accuracy of the present method is verified by comparing the obtained results with First-order shear deformation theory, and other predicted by quasi-3D higher-order shear deformation theories. It can be concluded that the proposed theory is efficient and simple in predicting the natural frequencies of functionally graded plates on elastic foundations.
Guerroudj, Hicham Zakaria,Yeghnem, Redha,Kaci, Abdelhakim,Zaoui, Fatima Zohra,Benyoucef, Samir,Tounsi, Abdelouahed Techno-Press 2018 Smart Structures and Systems, An International Jou Vol.22 No.1
This research investigates the free vibration analysis of advanced composite plates such as functionally graded plates (FGPs) resting on a two-parameter elastic foundations using a hybrid quasi-3D (trigonometric as well as polynomial) higher-order shear deformation theory (HSDT). This present theory, which does not require shear correction factor, accounts for shear deformation and thickness stretching effects by a sinusoidal and parabolic variation of all displacements across the thickness. Governing equations of motion for FGM plates are derived from Hamilton's principle. The closed form solutions are obtained by using Navier technique, and natural frequencies are found, for simply supported plates, by solving the results of eigenvalue problems. The accuracy of the present method is verified by comparing the obtained results with First-order shear deformation theory, and other predicted by quasi-3D higher-order shear deformation theories. It can be concluded that the proposed theory is efficient and simple in predicting the natural frequencies of functionally graded plates on elastic foundations.