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Loss of coolant accident analysis under restriction of reverse flow
Majdi I. Radaideh,Tomasz Kozlowski,Yousef M. Farawila 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.6
This paper analyzes a new method for reducing boiling water reactor fuel temperature during a Loss ofCoolant Accident (LOCA). The method uses a device called Reverse Flow Restriction Device (RFRD) at theinlet of fuel bundles in the core to prevent coolant loss from the bundle inlet due to the reverse flow aftera large break in the recirculation loop. The device allows for flow in the forward direction which occursduring normal operation, while after the break, the RFRD device changes its status to prevent reverseflow. In this paper, a detailed simulation of LOCA has been carried out using the U.S. NRC's TRACE code toinvestigate the effect of RFRD on the flow rate as well as peak clad temperature of BWR fuel bundlesduring three different LOCA scenarios: small break LOCA (25% LOCA), large break LOCA (100% LOCA), anddouble-ended guillotine break (200% LOCA). The results demonstrated that the device could substantiallyblock flow reversal in fuel bundles during LOCA, allowing for coolant to remain in the core during thecoolant blowdown phase. The device can retain additional cooling water after activating the emergencysystems, which maintains the peak clad temperature at lower levels. Moreover, the RFRD achieved thereflood phase (when the saturation temperature of the clad is restored) earlier than without the RFRD.
Viewer`s Affective Feedback for Video Summarization
( Majdi Dammak ),( Ali Wali ),( Adel M Alimi ) 한국정보처리학회 2015 Journal of information processing systems Vol.11 No.1
For different reasons, many viewers like to watch a summary of films without having to waste their time. Traditionally, video film was analyzed manually to provide a summary of it, but this costs an important amount of work time. Therefore, it has become urgent to propose a tool for the automatic video summarization job. The automatic video summarization aims at extracting all of the important moments in which viewers might be interested. All summarization criteria can differ from one video to another. This paper presents how the emotional dimensions issued from real viewers can be used as an important input for computing which part is the most interesting in the total time of a film. Our results, which are based on lab experiments that were carried out, are significant and promising.
Secure and Robust Clustering for Quantized Target Tracking in Wireless Sensor Networks
Majdi Mansouri,Lyes Khoukhi,Hazem Nounou,Mohamed Nounou 한국통신학회 2013 Journal of communications and networks Vol.15 No.2
We consider the problem of secure and robust clustering for quantized target tracking in wireless sensor networks (WSN) where the observed system is assumed to evolve according to a probabilistic state space model. We propose a new method for jointly activating the best group of candidate sensors that participate in data aggregation, detecting the malicious sensors and estimating the target position. Firstly, we select the appropriate group in order to balance the energy dissipation and to provide the required data of the target in the WSN. This selection is also based on the transmission power between a sensor node and a cluster head. Secondly, we detect the malicious sensor nodes based on the information relevance of their measurements. Then, we estimate the target position using quantized variational filtering (QVF) algorithm. The selection of the candidate sensors group is based on multi-criteria function, which is computed by using the predicted target position provided by the QVF algorithm, while themalicious sensor nodes detection is based on Kullback-Leibler distance between the current target position distribution and the predicted sensor observation. The performance of the proposed method is validated by simulation results in target tracking for WSN.
Digital Image Watermarking Based On Joint (DCT-DWT) and Arnold Transform
Majdi Farag Mohammed El Bireki,M. F. L. Abdullah,li Abdrhman M. Ukasha,Ali A. Elrowayati 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.5
The researcher has adopted a digital watermarking technique which operates in the frequency domain: a hybrid watermarking scheme based joint discrete wavelet transform – discrete cosine transform – (DWT-DCT). Its main objective is to test whether this technique can withstand attacks (its robustness) and invisibility (its imperceptibility), achieved by taking DCT of the DWT coefficients of the LL mid-frequency sub-bands from its band. To ensure security, the secret code (watermark) is scrambled using the Arnold transformation which is embedded in the original host image; only gray-scale digital images are used. The results of this research reveal that the secret code (watermark) is strong enough against threats (noise). Comparative results are measured using signal-to-noise ratio criterions, mean square error and normalized cross correlation. Simulated experimentation is done in Matlab.
Majdi M. Bkhaitan,Agha Zeeshan Mirza 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.9
The present study describes a convenient stability-indicating HPLC-DAD method for the separation and simultaneous determination of the drugs atorvastatin, irbesartan, and amlodipine in bulk and formulations. The method proposed demonstrated good separation between atorvastatin, irbesartan, amlodipine and their main degradation products. Separation was executed on a Waters XBrigde C18 column (5 µm, 25 × 0.46 cm) using a gradient mobile phase system consisting of acetonitrile and orthophosphoric acid buffer (pH 2.2) at a flow rate of 1 mL/min and UV detection at 240 nm. The drugs were subjected to acidic and basic hydrolysis, oxidation, exposure to UV light, and exposure to temperature (dry heat) to apply stress conditions. Linearity of the method was evaluated in the range 5–30 µg/mL for each drug with correlation coefficient values (r2) of 0.9982, 0.9973, and 0.9986 for atorvastatin, irbesartan, and amlodipine, respectively. The limits of detection were 0.05, 0.06, and 0.08 µg/mL for the three compounds, respectively. No interference was observed with the detection of the compounds in presence of degradable products; hence, it is confirmed that the analysis is stability-indicating.
E-government success assessment from a public value perspective
Majdi Mellouli,Fatma Bouaziz,Omar Bentahar 한국행정학회 2020 International Review of Public Administration Vol.25 No.3
Public organizations are massively using ICTs. Leading to e-government development, they expect creating public value. However, little empirical evidence about achieving the expected benefits exists. Focusing on the private sector, the extant theoretical models for IT value are not suitable for e-government. This research builds on the DeLone and McLean (D&M) IS success model and the e-government public value perspective to propose and test a model of e-government success from the perspective of government employees. Organizational performance and environmental sustainability are investigated as the two main dimensions of e-government public value in relation with the three quality variables, intention to use and user satisfaction. Based on PLS-SEM techniques, the results show that an intention to use the taxation system and user satisfaction lead to public value measured by organizational performance and environmental sustainability. They demonstrate the adequacy of the research model to assess e-government value from the standpoint of the government employees.
A comparison of the forces on dome and prism for straight and tornadic wind using CFD model
Yousef, Majdi A.A.,Selvam, Panneer R.,Prakash, Jai Techno-Press 2018 Wind and Structures, An International Journal (WAS Vol.26 No.6
Tornadoes are vertical swirling air formed because of the existence of layers of air with contrasting features of temperature, wind flow, moisture, and density. Tornadoes induce completely different wind forces than a straight-line (SL) wind. A suitably designed building for an SL wind may fail when exposed to a tornado-wind of the same wind speed. It is necessary to design buildings that are more resistant to tornadoes. In tornado-damaged areas, dome buildings seem to have less damage. As a dome structure is naturally wind resistant, domes have been used in back yards, as single family homes, as in-law quarters, man caves, game rooms, storm shelters, etc. However, little attention has been paid to the tornadic wind interactions with dome buildings. In this work, the tornado forces on a dome are computed using Computational Fluid Dynamics (CFD) for tornadic and SL wind. Then, the interaction of a tornado with a dome and a prism building are compared and analyzed. This work describes the results of the tornado wind effect on dome and prism buildings. The conclusions drawn from this study are illustrated in visualizations. The tornado force coefficients on a dome building are larger than SL wind forces, about 120% more in x- and y-directions and 280% more in z-direction. The tornado maximum pressure coefficients are also higher than SL wind by 150%. The tornado force coefficients on the prism are larger than the forces on the dome, about 100% more in x- and y-directions, and about 180% more in z-direction. The tornado maximum pressure coefficients on prism also are greater those on dome by 150% more. Hence, a dome building has less tornadic load than a prism because of its aerodynamic shape.
An Application of The Islamic Methodology in The Enactment of Criminal Laws and Policy Formulation
Almarashi, Majdi Saeed International Journal of Computer ScienceNetwork S 2022 International journal of computer science and netw Vol.22 No.8
Public policies are subject to the general strategies and agendas of the state and the enactment of law is subject to the superior laws. This paper will clarify in a practical way how the strategies and agenda of an Islamic state and the superior law (the primary sources of Sharia law) affect the mechanism of enacting laws and creating policies in an Islamic government. Especially, in the field of criminal law.