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Syed Raza Ali Raza,임준영,Zamir-ul-Hassan,임성길,이영탁 한국물리학회 2020 Current Applied Physics Vol.20 No.12
In this work, electrical Joule heating (J-H) was employed for the first time to electrically isolate ZnO nanowire FETs array for one dimensional (1D) logic applications without any physical and electrical damages. The electrical properties of the isolated nanowire FETs were found to be superior to non-isolated FETs came from the neighboring gate effect. Finally, we investigated ZnO nanowire-based NOT, NAND, and NOR logic gates with the J-H nanowire isolation technique. The isolated logic gates clearly show much lower output voltage off level than the non-isolated circuits thus resulting in more accurate and reliable 1D electronic applications.
A ZnO nanowire-based photo-inverter with pulse-induced fast recovery.
Raza, Syed Raza Ali,Lee, Young Tack,Hosseini Shokouh, Seyed Hossein,Ha, Ryong,Choi, Heon-Jin,Im, Seongil RSC Pub 2013 Nanoscale Vol.5 No.22
<P>We demonstrate a fast response photo-inverter comprised of one transparent gated ZnO nanowire field-effect transistor (FET) and one opaque FET respectively as the driver and load. Under ultraviolet (UV) light the transfer curve of the transparent gate FET shifts to the negative side and so does the voltage transfer curve (VTC) of the inverter. After termination of UV exposure the recovery of photo-induced current takes a long time in general. This persistent photoconductivity (PPC) is due to hole trapping on the surface of ZnO NWs. Here, we used a positive voltage short pulse after UV exposure, for the first time resolving the PPC issue in nanowire-based photo-detectors by accumulating electrons at the ZnO/dielectric interface. We found that a pulse duration as small as 200 ns was sufficient to reach a full recovery to the dark state from the UV induced state, realizing a fast UV detector with a voltage output.</P>
Raza, Syed Abbas,Karim, Muhammad Ramzan Abdul,Shehbaz, Tauheed,Taimoor, Aqeel Ahmad,Ali, Rashid,Khan, Muhammad Imran The Korean Electrochemical Society 2022 Journal of electrochemical science and technology Vol.13 No.2
In the present study, the corrosion behavior of aluminum Al-7075 tempered (T-6 condition) alloy was evaluated by immersion testing and electrochemical testing in 1.75% and 3.5% NaCl environment at acidic, neutral and basic pH. The data obtained by both immersion tests and electrochemical corrosion tests (potentiodynamic polarization and electrochemical impedance spectroscopy tests) present that the corrosion rate of the alloy specimens is minimum for the pH=7 condition of the solution due to the formation of dense and well adherent thin protective oxide layer. Whereas the solutions with acidic and alkaline pH cause shift in the corrosion behavior of aluminum alloy to more active domains aggravated by the constant flux of acidic and alkaline ions (Cl<sup>-</sup> and OH<sup>-</sup>) in the media which anodically dissolve the Al matrix in comparison to precipitated intermetallic phases (cathodic in nature) formed due to T6 treatment. Consequently, the pitting behavior of the alloy, as observed by cyclic polarization tests, shifts to more active regions when pH of the solutions changes from neutral to alkaline environment due to localized dissolution of the matrix in alkaline environment that ingress by diffusion through the pores in the oxide film. Microscopic analysis also strengthens the results obtained by immersion corrosion testing and electrochemical corrosion testing as the study examines the corrosion behavior of this alloy under a systematic evaluation in marine environment.
5G NR mmWave Indoor Coverage with Massive Antenna System
Syed Hassan Raza Naqvi,Pin Han Ho,Limei Peng 한국통신학회 2021 Journal of communications and networks Vol.23 No.1
In this paper, we introduce a novel mmWave access architecture,called mmWave over cable (mmWoC), for achieving effectiveindoor coverage, which is characterized by using an analogmodulated relay link to transport the outdoor mmWave signalsto the indoors. To enable an effective mapping of radio signals onthe cable sub-carriers, we introduce non-configurable air-to-cable(NC-A2C) scheduler that is characterized by its low control complexityand hardware requirement. We will discuss the merits ofthe proposed mmWoC access architecture and the NC-A2C scheduler,which are further validated via extensive simulations.
차량 네트워크에서 수평 수직 핸드오버를 위한 SDN 기반 프록시 모바일 IPv6
( Syed Muhammad Raza ),( Sanggil Yeoum ),( Dongsoo Kim ),( Hyunseung Choo ) 한국정보처리학회 2014 한국정보처리학회 학술대회논문집 Vol.21 No.2
This paper proposes a SDN based Proxy Mobile IPv6 (PMIPv6) architecture for heterogeneous vehicular networks (SDN-VANET), to provide the continuity of service during the horizontal handovers and to reduce the delay during vertical and horizontal handovers. SDN-VANET mainly relies on DSRC road side units (RSUs) for V2I communication and to overcome the coverage problem SDN-VANET performs the vertical handover between DSRC and LTE/UMTS. To date there is no standard to perform network layer vertical handovers. Therefore the proposed SDN-VANET architecture also doesn’t provide any mechanism for vertical network layer handovers, but solves the horizontal network layer handovers in DSRC or LTE/UMTS through introducing PMIPv6 in the architecture.
Leveraging Proxy Mobile IPv6 with SDN
RAZA SYED MUHAMMAD,Dongsoo S. Kim,신동렬,추현승 한국통신학회 2016 Journal of communications and networks Vol.18 No.3
The existing Proxy Mobile IPv6 suffers from a long handoverlatency which in turn causes significant packet loss that isunacceptable for seamless realtime services such as multimediastreaming. This paper proposes an OpenFlow-enabled proxy mobileIPv6 (OF-PMIPv6) in which the control of access gateways iscentralized at an OpenFlow controller of a foreign network. Theproposed OF-PMIPv6 separates the control path from the datapath by performing the mobility control at the controller, whereasthe data path remains direct between a mobile access gateway anda local mobility anchor in an IP tunnel form. A group of simpleOpenFlow-enabled access gateways performs link-layer controland monitoring activities to support a comprehensive mobility ofmobile nodes, and communicates with the controller through thestandard OpenFlow protocol. The controller performs networklayermobility control on behalf of mobile access gateways andcommunicates with the local mobility anchor in the Proxy MobileIPv6 domain. Benefiting from the centralized view and information,the controller caches the authentication and configurationinformation and reuses it to significantly reduce the handover latency. An analytical analysis of the proposed OF-PMIPv6 reactiveand proactive handover schemes shows 43% and 121% reductionin the handover latency, respectively, for highly utilized network. The results gathered from the OF-PMIPv6 testbed suggestsimilar performance improvements.
Tool Wear Patterns When Turning of Titanium Alloy Using Sustainable Lubrication Strategies
Syed Waqar Raza,Ibrahim Deiab,Salman Pervaiz 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.
A key area of research in sustainable machining is the search for environmentally benign cooling strategies. Vegetable oils have oftenbeen proposed as sustainable alternative to the conventional synthetic emulsion coolants. Techniques like dry and cryogenicmachining, MQL and MQCL have also been proposed. The current study investigates the effect of six different strategies on the flanktool wear during turning of titanium Ti-6Al-4v using uncoated carbide tool at two levels of speed and feed. The mechanisms of toolwear are discussed. The use of rapeseed vegetable oil in MQL and MQCL configuration turns out to be an overall sustainablealternative at low feed and speed. Thus confirming the promise predicted in the use of vegetable oil as a lubricant for machining. At high speed and feed, cryogenic machining is more suitable for sustainable machining of Titanium.