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A Deep Recurrent Neural Network Framework for Swarm Motion Speed Prediction
Khaldi Belkacem,Harrou Fouzi,Dairi Abdelkader,Sun Ying 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.5
Controlling and maintaining swarm robotic systems executing daily collective actions and accomplishing tasks more successfully in groups requires a timely and accurate forecast of swarm motion speed, which becomes a challenging task owing to swarm motion’s high dynamic feature. In this work, six potent forecasting recurrent deep neural networks, including RNN, LSTM, GRU, ConvLSTM, Bidirectional LSTM (BiLSTM), and BiGRU, are explored and compared in forecasting the motion speed of miniature swarm mobile robots engaged in a simple aggregation formation task. Essentially, the introduced forecasting models take advantage of the viscoelastic control model in flexibly controlling swarm robots and the capabilities of DL models to capture patterns in time series data. To this end, sensor measurements from a simulated swarm of foot bots conducting a circle formation task through the viscoelastic controller are recorded every 0.1 s and used as input vectors for forecasting purposes. The results show the promising performance of DL for swarm motion forecasting. Moreover, obtained results report that BiGRU reaches the highest swarm motion speed forecasting performance with the no/with obstacles scenarios considered in this study.
Synthesis, Characterization and Biological Evaluation of Triclosan Grafted onto Cellulosic Fibers
Khaldi Zineb,Nzambe Ta Keki Jean Kerim,Besse Claire,Ouk Tan-Sothéa,Hadj-Bouazza Amel,Zerrouki Rachida 한국섬유공학회 2018 Fibers and polymers Vol.19 No.9
With the increased risk of disease transmissions and cross-infection caused by microorganisms, the control of microbial infections becomes a very important issue in modern societies. Moreover, with the emergence of antibio-resistant bacterial strains, it is necessary to control the bacterial growth. One of ways to limit the bacterial proliferation is to develop antimicrobial surfaces. The present work describes the synthesis process of a direct linking of propargyled Triclosan to a modified Kraft Pulp. Propargylated Triclosan, and azidated Kraft Pulp were linked in the presence of Cu(I) catalyst, a type of Huisgen’s 1,3-dipolar azide-alkyne cycloaddition reaction, leading to the formation of Triclosan linked to kraft Pulp fibers. The modified Kraft Pulp fibers are characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). This novel material has been investigated for its antibacterial properties against Escherichia coli, Staphylococcus aureus, Bacillus cereus and Pseudomonas aeruginosa. The developed material showed an important antibacterial activity. Although Triclosan is covalently grafted onto Kraft Pulp, its antibacterial properties are maintained.
Souheyla Khaldi,Abdel Illah Nabil Korti,Said Abboudi 대한설비공학회 2017 International Journal of Air-Conditioning and Refr Vol.25 No.3
Successful drying requires a uniform heating of the product along the trays. This condition is a real challenge in the design of solar dryers. Studies show that a conventional solar dryer provides a nonuniform temperature distribution at the trays level. This paper seeks to remedy this problem by adding a second air inlet to the cabinet dryer in order to get a more homogeneous temperature. Unsteady turbulent airflow and heat transfer through a two-dimensional model is carried out for a typical day of August under the climatic conditions of Tlemcen (Algeria). Figs fruit was selected to be dried. The effect of the proposed configuration on the dynamic and thermal behaviors of the solar dryer has been discussed. The results revealed that using two opposite inlets can improve the drying process by reducing the fluctuation of the temperature to about 67% and increasing the mass flow rate by about 18%.
Plant diversity in different bioclimatic zones in Tunisia
You, H.,Jin, H.,Khaldi, A.,Kwak, M.,Lee, T.,Khaine, I.,Jang, J.,Lee, H.,Kim, I.,Ahn, T.,Song, J.,Song, Y.,Khorchani, A.,Stiti, B.,Woo, S. Korean Biodiversity Information Facility 2016 Journal of Asia-Pacific biodiversity(Online) Vol.9 No.1
The Republic of Tunisia, located in northern Africa, faces various environmental challenges caused by anthropogenic practices such as overgrazing, deforestation, and desertification. The conversion of natural ecosystems is the major cause of plant biodiversity loss. Tunisia can be divided into three main climatic zones as follows: a northern Mediterranean climate zone, a central steppe climate zone, and a southern desert climate zone. Because of this great environmental diversity, there are distinctive vegetation and various genetic resources in Tunisia. This research was conducted to investigate plant biodiversity within the various bioclimatic zones and to characterize useful plant resources in Tunisia. We investigated native, medicinal and aromatic, desert, and soil erosion control plant species.
Electrochemical Studies on the Ca-Based Hydrogen Storage Alloy for Different Milling Times
Y. Dabaki,C. Khaldi,N. Fenineche,O. ElKedim,M. Tliha,J. Lamloumi 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.5
The CaNi4.8Mn0.2powder was synthesized by mechanical alloying, under an atmosphere of argon at room temperature,at different milling times (2, 10, 20, 30, 40, 50 and 60 h) with ball to powder weight ratio of 8:1. The structural and morphologicalcharacterizations of the CaNi4.8Mn0.2powder were carried, respectively, by scanning electron microscopy andX-ray diffraction. After 2 h, all the alloys had a biphasic structure, two major phases, Ni and Ca2Ni7,remained virtuallyunchanged when a small amount of Mn was added. After more than 40 h of milling, the same peaks of the Ni and Ca2Ni7phases appeared, while the intensity of the peaks decreased, indicating an additional amorphization process. After 50 h ofmilling, this damping was followed by the crystallization amorphization. The electrochemical properties of CaNi4.8Mn0.2electrodes were studied at different milling times (10, 20, 30, 40, 50 and 60 h) and in KOH electrolyte concentrations (1 Mand 6 M) at ambient temperature, as anodes in the Ni–MH battery. Different techniques were used, such as galvanostaticpolarization, potentiostatic polarization and potentiodynamic polarization.
Plant diversity in different bioclimatic zones in Tunisia
유하나,진혜영,Abdelhamid Khaldi,곽명자,이태윤,Inkyin Khaine,장지휘,이현경,Iereh Kim,안태현,송정화,송유진,Ali Khorchani,Boutheina Stiti,우수영 국립중앙과학관 2016 Journal of Asia-Pacific Biodiversity Vol.9 No.1
The Republic of Tunisia, located in northern Africa, faces various environmental challenges caused by anthropogenic practices such as overgrazing, deforestation, and desertification. The conversion of natural ecosystems is the major cause of plant biodiversity loss. Tunisia can be divided into three main climatic zones as follows: a northern Mediterranean climate zone, a central steppe climate zone, and a southern desert climate zone. Because of this great environmental diversity, there are distinctive vegetation and various genetic resources in Tunisia. This research was conducted to investigate plant biodiversity within the various bioclimatic zones and to characterize useful plant resources in Tunisia. We investigated native, medicinal and aromatic, desert, and soil erosion control plant species.
Mekki Zerouali,Fouad Khaldi,Zina Belkhiri 대한설비공학회 2018 International Journal Of Air-Conditioning and Refr Vol.26 No.3
Solar distillation is a simple method used for the production of drinking water from saline or brackish water. This method proposes a solution for the production of fresh water in arid and desert areas, where a large solar field is available and also the existence of underground sources of saline water. A solar distiller with a single basin and double slopes is theoretically examined. The theoretical model is based on the resolution of equations of heat and mass transfer dependent on time for glazing cover, water film and absorber basin. For validating the results of the theoretical model, a comparison with the experimental results was carried out. A series of experimental tests on a solar distiller with double slopes in the climatic conditions of Ouargla in Algeria were performed. The tests were carried out on 19th February 2009. The amount of water distilled was 2.7 liters, after a day's work. The results show that the cooling of the glazing cover leads to increase in the amount of distilled water of about 17% in comparison with the reference case. In addition, we found a good agreement between the results of the theoretical model and the experimental data.
박태진,이우균,우수영,유성진,곽두안,Boutheina Stiti,Abdelhamid Khaldi,Xu Zhen,권태협 한국산림과학회 2011 Forest Science And Technology Vol.7 No.2
Understanding the patterns of land-cover change for biodiversity and ecology system function has been important in landscape ecology. The objective of this study was to analyze land-cover change in the Ain Snoussi area of northern Tunisia. Landsat MSS/4 and SPOT HRV/3 images were used for the analysis. To classify land-cover type into forest and non-forest area, pixel-based classification and maximum likelihood algorithm were applied to two imageries using supervised classification algorithm. After classification of images, each changed area was calculated. Thereby, analysis of distance roads and topographic factors such as elevation, slope, aspect, and Topographic Wetness Index (TWI) were performed. The results showed that the area changed into non-forest was slightly larger than that into forest. Moreover, most of the changed areas, approximately half of the total changed area, were distributed near the roads. In addition, the change from forest to non-forest area tends to have a negative and positive relationship respectively with elevation and slope. On the other hand, the change from non-forest to forest area showed the tendency to be negative in elevation, slope, and TWI. However, the slope aspect of study area did not have any particular relationship with change tendency. In conclusion, spatial pattern of land-cover change was influenced by the distance from roads and topographic characteristics of target area.