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- 저자 : Hassan Safdar (검색결과 14 건)
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Hassan Aisar Ul,Jadoon Zeeshan Ali Safdar,Kim Jin-Tae,노흥렬 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.82 No.9
In this study the efects of neighboring transitions through Doppler broadening on electromagnetically induced absorption and transparency of degenerate two-level system in Rb atoms with respect to circular orthogonal polarization confguration (σ+ − σ−) of coupling and probe lasers have been investigated. The dominance of closed Fg = 3 → Fe = 4 of 85Rb (Fg = 2 → Fe = 3 of 87Rb) D2 transition results in the observation of asymmetric and split electromagnetically induced absorptions at all of transitions regardless of the openness or closing of the transitions even in low intensity regime. Slight diferences between the spectra of 85Rb and 87Rb are analyzed by investigating the variation of the spectra of 85Rb with an artifcial increase of the hyperfne splittings and accordingly with a decreasing of the neighboring efects.
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Safdar Hussain Bouk,Iwao Sasase,Syed Hassan Ahmed,Nadeem Javaid 한국통신학회 2012 Journal of communications and networks Vol.14 No.4
Several gateway selection schemes have been proposed that select gateway nodes based on a single Quality of Service (QoS) path parameter, for instance path availability period, link capacity or end-to-end delay, etc. or on multiple non-QoS parameters,for instance the combination of gateway node speed, residual energy, and number of hops, for Mobile Ad hoc NETworks (MANETs). Each scheme just focuses on the ment of improve only a single network performance, i.e., network throughput, packet delivery ratio, end-to-end delay, or packet drop ratio. However, none of these schemes improves the overall network performance because they focus on a single QoS path parameter or on set of non-QoS parameters. To improve the overall network performance, it is necessary to select a gateway with stable path, a path with themaximum residual load capacity and the minimum latency. In this paper,we propose a gateway selection scheme that considers multiple QoS path parameters such as path availability period, available capacity and latency, to select a potential gateway node. We improve the path availability computation accuracy, we introduce a feedback system to updated path dynamics to the traffic source node and we propose an efficient method to propagate QoS parameters in our scheme. Computer simulations show that our gateway selection scheme improves throughput and packet delivery ratio with less per node energy consumption. It also improves the end-to-end delay compared to single QoS path parameter gateway selection schemes. In addition, we simulate the proposed scheme by considering weighting factors to gateway selection parameters and results show that the weighting factors improve the throughput and endto-end delay compared to the conventional schemes.
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Named-Data-Networking-Based ITS for Smart Cities
Bouk, Safdar Hussain,Ahmed, Syed Hassan,Kim, Dongkyun,Song, Houbing Institute of Electrical and Electronics Engineers 2017 IEEE communications magazine Vol.55 No.1
<P>A smart city enhances the quality of its citizens' lives by providing ease of access to ubiquitous services through integration using communication systems at the foundation. Additionally, ITS plays a major role in making a metropolitan area into a smart city. The current IP-based solutions for ITS have slanted the performance due to high demand for data on the move, especially when the consumers become the producers. Meanwhile, NDN has evolved as a promising future Internet architecture and is being investigated extensively. In this article, we discuss the core functionality of NDN followed by our new architecture proposed for ITS in smart cities. Also, we highlight the current and future research challenges for NDN-enabled ITS in the context of smart cities.</P>
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Bouk, Safdar Hussain,Sasase, Iwao,Ahmed, Syed Hassan,Javaid, Nadeem The Korea Institute of Information and Commucation 2012 Journal of communications and networks Vol.14 No.4
Several gateway selection schemes have been proposed that select gateway nodes based on a single Quality of Service (QoS) path parameter, for instance path availability period, link capacity or end-to-end delay, etc. or on multiple non-QoS parameters, for instance the combination of gateway node speed, residual energy, and number of hops, for Mobile Ad hoc NETworks (MANETs). Each scheme just focuses on the ment of improve only a single network performance, i.e., network throughput, packet delivery ratio, end-to-end delay, or packet drop ratio. However, none of these schemes improves the overall network performance because they focus on a single QoS path parameter or on set of non-QoS parameters. To improve the overall network performance, it is necessary to select a gateway with stable path, a path with themaximum residual load capacity and the minimum latency. In this paper, we propose a gateway selection scheme that considers multiple QoS path parameters such as path availability period, available capacity and latency, to select a potential gateway node. We improve the path availability computation accuracy, we introduce a feedback system to updated path dynamics to the traffic source node and we propose an efficient method to propagate QoS parameters in our scheme. Computer simulations show that our gateway selection scheme improves throughput and packet delivery ratio with less per node energy consumption. It also improves the end-to-end delay compared to single QoS path parameter gateway selection schemes. In addition, we simulate the proposed scheme by considering weighting factors to gateway selection parameters and results show that the weighting factors improve the throughput and end-to-end delay compared to the conventional schemes.
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RUFS: RobUst Forwarder Selection in Vehicular Content-Centric Networks
Ahmed, Syed Hassan,Bouk, Safdar Hussain,Dongkyun Kim IEEE 2015 IEEE communications letters Vol.19 No.9
<P>Vehicular Content-Centric Network (VCCN) has emerged as a future network technology for vehicular networks, where the focus of communication is shifted from the host to information centric. However, VCCN faces several challenges, including interest/data packet(s) flooding, provider/consumer mobility, and so on. In this letter, we propose a scheme named RobUst Forwarder Selection (RUFS) to mitigate the interest broadcast storm. In RUFS, each vehicle shares its satisfied interest(s) statistics with neighbors. All neighbors store this information in their Neighbors Satisfied List (NSL), which helps to select the potential interest forwarder. Simulation results show that RUFS outperforms the recently proposed NAIF, DR based and basic interest forwarding in VCCN.</P>
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DIFS: Distributed Interest Forwarder Selection in Vehicular Named Data Networks
Ahmed, Syed Hassan,Bouk, Safdar Hussain,Yaqub, Muhammad Azfar,Kim, Dongkyun,Song, Houbing IEEE 2018 IEEE transactions on intelligent transportation sy Vol.19 No.9
<P>In this paper, we propose a distributed interest forwarder selection (DIFS) scheme that mitigates the interest broadcast storm in vehicular named data networks. In DIFS, a vehicle sends an interest packet piggybacking its location, distance to the neighbors, and speed. In this case, the immediate neighbors do not have the requested content and rank themselves to be an eligible interest forwarder by using multiple attributes. Additionally, every intermediate vehicle uses a digital map to be selected as forwarders in both (forward and backward) directions of the consumer. Simulations show that DIFS satisfies more interest packets with less delay as compared with the recent forwarding solutions.</P>
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Named Data Networking for Software Defined Vehicular Networks
Ahmed, Syed Hassan,Bouk, Safdar Hussain,Dongkyun Kim,Rawat, Danda B.,Houbing Song Institute of Electrical and Electronics Engineers 2017 IEEE communications magazine Vol.55 No.8
<P>Named data networking and software defined networking share mutual courage in changing legacy networking architectures. In the case of NDN, IP-based communication has been tackled by naming the data or content itself, while SDN proposes to decouple the control and data planes to make various services manageable without physical interference with switches and routers. Both NDN and SDN also support communication via heterogeneous interfaces and have been recently investigated for vehicular networks. Naive VNs are based on the IP-based legacy, which is prone to several issues due to the dynamic network topology among other factors. In this article, we first see both SDN and NDN enabled VNs from a bird's eye view, and for the very first time, we present an architecture that combines SDN functionalities within VNs to retrieve the required content using NDN. Moreover, we discuss a number of current research challenges and provide a precise roadmap that can be considered for the research community to jointly address such challenges.</P>
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CODIE: Controlled Data and Interest Evaluation in Vehicular Named Data Networks
Ahmed, Syed Hassan,Bouk, Safdar Hussain,Yaqub, Muhammad Azfar,Kim, Dongkyun,Song, Houbing,Lloret, Jaime IEEE 2016 IEEE Transactions on Vehicular Technology VT Vol.65 No.6
<P>Recently, named data networking (NDN) has been proposed as a promising architecture for future Internet technologies. NDN is an extension to the content-centric network (CCN) and is expected to support various applications in vehicular communications [ vehicular NDN (VNDN)]. VNDN basically relies on naming the content rather than using end-to-end device names. In VNDN, a vehicle broadcasts an 'Interest' packet for the required 'content,' regardless of end-to-end connectivity with servers or other vehicles and known as a 'consumer.' In response, a vehicle with the content replies to the Interest packet with a 'Data' packet and named as a 'provider.' However, the simple VNDN architecture faces several challenges such as consumer/provider mobility and Interest/Data packet(s) forwarding. In VNDN, for the most part, the Data packet is sent along the reverse path of the related Interest packet. However, there is no extensive simulated reference available in the literature to support this argument. In this paper, therefore, we first analyze the propagation behavior of Interest and Data packets in the vehicular ad hoc network (VANET) environment through extensive simulations. Second, we propose the 'CODIE' scheme to control the Data flooding/broadcast storm in the naive VNDN. The main idea is to allow the consumer vehicle to start hop counter in Interest packet. Upon receiving this Interest by any potential provider, a data dissemination limit (DDL) value stores the number of hops and a data packet needs to travel back. Simulation results show that CODIE forwards fewer copies of data packets processed (CDPP) while achieving similar interest satisfaction rate (ISR), as compared with the naive VNDN. In addition, we also found that CODIE also minimizes the overall interest satisfaction delay (ISD), respectively.</P>
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