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Numerical Punching Shear Analysis of Unbonded Post-Tensioned Slabs with Inverted-U Shaped
Milad Khatib,Zaher Abou Saleh,Oussama Baalbaki,Yehia Temsah 대한토목학회 2018 KSCE Journal of Civil Engineering Vol.22 No.11
In order to increase the strength and deformation capacity of flat slabs, punching shear reinforcement is used as an effective solution. Several types of punching shear reinforcing systems have been developed in the past. This work aims to analyze the behavior of unbonded post-tensioned slab subjected to punching load provided with “Inverted-U Shaped Reinforcement”. By using a finite element software, the results were compared with that obtained from an experimental investigation previously done. The experimental results were also compared according to ACI provisions for punching shear strength. Good correlation was done between what was tested and the numerical results.
Design Optimization of Hybrid Actuation Combining Macro-Mini Actuators
김남호,김종민,Oussama Khatib,신동준 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.4
A significant challenge in the development of human-safe robots is how to optimize performance while maintaining high safety standards. One promising solution is a hybrid actuation concept which combines low-frequency and high-frequency actuators. However, actuator sizing of the hybrid actuation is a difficult proposition, since motor torque capacity significantly affects robot control performance and safety. Deriving an analytical model of the hybrid actuation, we propose a design methodology to determine an optimal actuator size, which provides a combination of high control bandwidth and low impedance. Our simulation and experimental results validated the proposed methodology showing that the obtained actuator parameters from the methodology improved control bandwidth while keeping effective inertia minimum.
Mohamed Harnafi,Oussama Bekkouch,Ilham Touiss,Saloua Khatib,Imane Mokhtari,Dragan Milenkovic,Hicham Harnafi,Souliman Amrani 한국식품영양과학회 2020 Preventive Nutrition and Food Science Vol.25 No.3
Hyperlipidemia and oxidative stress are risk factors for atherosclerosis. In this study, we investigated the hypolipidemic and anti-lipoprotein oxidation activities of polyphenol-rich extracts from almond hulls using Triton WR-1339 and high-fat diet-induced hyperlipemic mice as experimental models. We demonstrated that the almond hull extract significantly reduced total cholesterol, triglycerides and low-density lipoprotein-related plasma cholesterol (LDL-C) in the two experimental models of hyperlipidemia, but significantly increased high-density lipoprotein-related plasma cholesterol (HDL-C). Another beneficial effect of the extract was its ability to reduce the atherogenic index and LDL-C/HDL-C ratio. However, the extract exhibited effective antiradical activity against 2,2-diphenyl-1-picrylhydrazyl and significantly protected lipoprotein-rich plasma from mice against oxidation induced by copper ion. The extract contains 342.63±3.44 ㎎/g total phenolics, 144.67±6.83 ㎎/g tannins, and 20.66±0.92 ㎎/g flavonoids. These finding indicate that almond hulls contain polar products able to lower plasma lipid concentrations and which might be beneficial for the treatment of hyperlipidemia and prevention of atherosclerosis.
Anas Daou,Abdul Rahman Mahayri,Yehia Daou,Oussama Baalbaki,Milad Khatib 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.6
Structural steel and reinforced concrete are the main materials used in civil structures, and each has its own advantages and disadvantages. Nonetheless, when they are combined together to form a composite material, they result in tremendous advancements. There exist diff erent devices to attain the composite action between steel and concrete among which is the shear stud connector that represents one of the most commonly used methods in composite construction, and it is the scope of this study. This monograph examines the degree of shear connection in steel–concrete composite beams depending on the properties of the shear connectors, where mild and rigid shear connectors where studied. It has been concluded via a non-linear numerical analysis backed by experimental testing that the capacity and the deformation of composite beams depend on the confi guration and the mechanical properties of the shear connectors. Moreover, a simplifi ed model to predict the degree of shear connection and the capacity of the composite beam was proposed.
Shin, Dongjun,Tanaka, Akichika,Kim, Namho,Khatib, Oussama IEEE 2016 IEEE/ASME transactions on mechatronics Vol.21 No.6
<P>Safe actuation is one of the most important requirements for human-robot collaboration. Although a variety of passive brakes have been developed in order to safely regulate joint velocities, their performances are significantly subjective to gravity direction and mounting position, and thus are not suitable for multi-degrees of freedom (DoF) robotic applications. Addressing these issues, we developed a centrifugal force-based configuration-independent high-torque-density passive brake. The brake is rapidly and bidirectionally activated at the desired velocity limit in any orientation relative to the direction of gravity. A design optimization methodology is proposed for high-torque density and low-reflected inertia, which allows for inherent safe actuation in the event of a system failure. Experimental results demonstrate that the proposed brake is an effective solution for limiting velocity in multi-DoF human-friendly robots.</P>