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RISS 인기검색어
- 검색키워드
- 저자 : Daniel M. Ruiz (검색결과 5 건)
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Resonantly hybridized excitons in moiré superlattices in van der Waals heterostructures
Alexeev, Evgeny M.,Ruiz-Tijerina, David A.,Danovich, Mark,Hamer, Matthew J.,Terry, Daniel J.,Nayak, Pramoda K.,Ahn, Seongjoon,Pak, Sangyeon,Lee, Juwon,Sohn, Jung Inn,Molas, Maciej R.,Koperski, Maciej Nature Publishing Group 2019 Nature Vol.567 No.7746
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C?sar Daniel Rivera‑Tello,Francisco Javier Flores‑Ruiz,M. Flores,O. Jimenez,I. Far?as,J. Oseguera‑Pe?a 한국탄소학회 2021 Carbon Letters Vol.31 No.1
This paper presents a Raman spectroscopy study of the influence of methane flow on the micro-tribological behavior of diamond-like carbon coatings deposited with an industrial plasma-enhanced chemical vapor deposition system. Results have shown a direct relationship between the methane flow and thickness of the coatings. The analysis of the Raman spectra and deposition parameters allowed establishing the influence of H content with the methane flow, the disorder level and estimation of the sp3 fraction on the carbon coatings. The micro-tribology tests showed a strong dependence of the wear resistance and hardness with Raman parameters. The coating deposited at 72-sccm methane flow presented a thickness of 1.7 μm and a sp3 fraction of 0.33. This sp3 fraction gave rise to a hardness of 24 GPa and an excellent wear resistance of 3.3 × 10–6 mm3 N?1 mm?1 for this DLC coating. Wear tests showed a swelling in the wear profiles on this coating, which was associated with the occurrence of a re-hybridization process.
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Evaluation of the Use of Guard Nodes for Securing the Routing in VANETs
Juan A. Martinez,Daniel Vigueras,Francisco J. Ros,Pedro M. Ruiz 한국통신학회 2013 Journal of communications and networks Vol.15 No.2
We address the problem of effective vehicular routing in hostile scenarios where malicious nodes intend to jeopardize the delivery of messages. Compromised vehicles can severely affect the performance of the network by a number of attacks, such as selectively dropping messages, manipulating them on the fly, and the likes. One of the best performing solutions that has been used in static wireless sensor networks to deal with these attacks is based on the concept of watchdog nodes (also known as guard nodes) that collaborate to continue the forwarding of data packets in case a malicious behavior in a neighbor node is detected. In this work,we consider the beacon-less routing algorithm for vehicular environments routing protocol, which has been previously shown to perform very well in vehicular networks, and analyze whether a similar solution would be feasible for vehicular environments. Our simulation results in an urban scenario show that watchdog nodes are able to avoid up to a 50% of packet drops across different network densities and for different number of attackers, without introducing a significant increase in terms of control overhead. However, the overall performance of the routing protocol is still far from optimal. Thus, in the case of vehicular networks, watchdog nodes alone are not able to completely alleviate these security threats.
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Evaluation of the Use of Guard Nodes for Securing the Routing in VANETs
Martinez, Juan A.,Vigueras, Daniel,Ros, Francisco J.,Ruiz, Pedro M. The Korea Institute of Information and Commucation 2013 Journal of communications and networks Vol.15 No.2
We address the problem of effective vehicular routing in hostile scenarios where malicious nodes intend to jeopardize the delivery of messages. Compromised vehicles can severely affect the performance of the network by a number of attacks, such as selectively dropping messages, manipulating them on the fly, and the likes. One of the best performing solutions that has been used in static wireless sensor networks to deal with these attacks is based on the concept of watchdog nodes (also known as guard nodes) that collaborate to continue the forwarding of data packets in case a malicious behavior in a neighbor node is detected. In this work, we consider the beacon-less routing algorithm for vehicular environments routing protocol, which has been previously shown to perform very well in vehicular networks, and analyze whether a similar solution would be feasible for vehicular environments. Our simulation results in an urban scenario show that watchdog nodes are able to avoid up to a 50% of packet drops across different network densities and for different number of attackers, without introducing a significant increase in terms of control overhead. However, the overall performance of the routing protocol is still far from optimal. Thus, in the case of vehicular networks, watchdog nodes alone are not able to completely alleviate these security threats.
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Dynamic punching shear tests of flat slab-column joints with 5D steel fibers
Yezid A. Alvarado,Benjamín Torres,Manuel Buitrago,Daniel M. Ruiz,Sergio Y. Torres,Ramón A. Álvarez 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.81 No.3
This study aimed to analyze the dynamic punching shear performance of slab-column joints under cyclic loads with the use of double-hooked end (5D) steel fibers. Structural systems such as slab-column joints are widely found in infrastructures. The susceptibility to collapse of such structures when submitted to seismic loads is highly dependent on the structural performance of the slab-column connections. For this reason, the punching capacity of reinforced concrete (RC) structures has been the subject of a great number of studies. Steel fibers are used to achieve a certain degree of ductility under seismic loads. In this context, 5D steel hooked fibers provide high levels of fiber anchoring, tensile strength and ductility. However, only limited research has been carried out on the performance under cyclic loads of concrete structural members containing steel fibers. This study covers this gap with experimental testing of five different full-scale subassemblies of RC slab-column joints: one without punching reinforcement, one with conventional punching reinforcement and three with 5D steel fibers. The subassemblies were tested under cyclic loading, which consisted of applying increasing lateral displacement cycles, such as in seismic situations, with a constant axial load on the column. This set of cycles was repeated for increasing axial loads on the column until failure. The results showed that 5D steel fiber subassemblies: i) had a greater capacity to dissipate energy, ii) improved punching shear strength and stiffness degradation under cyclic loads; and iii) increased cyclic loading capacity.
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