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In classical virus spread model, the virus spreading process is described by infected probability, this process ignored some spreading details and the duration of contact. For this reason, we proposed a delay included dynamic virus spreading model and simulated the viruses' spreading process by cellular automata method. The unexpected result shows that the individual's moving behavior can hinder the...
Routing schemes in Delay Tolerant Networks depend on the intermediate nodes to carry messages till the forwarding of the messages to other nodes or delivery of the messages to their destinations. Thus, efficient and faster spreading of messages is essential to reduce the delay of sending a message from source to destination. In this work, we aim to design a new agent aided routing scheme in Delay...
This paper presents, through simulation experiments, a performance study of both IEEE 802.11n aggregation methods: A-MPDU (Aggregated MAC Protocol Data Unit) and A-MSDU (Aggregated MAC Service Data Unit), considering scenarios of video streaming. The objectives of this article are: (i) investigate the quality of service achieved, (ii) show which of the two methods of aggregation (A-MPDU or A-MSDU)...
Quality of Service (QoS) based scheduling in Cognitive radio networks (CRN) is a pressing research problem. The objective of this work is to study the feasibility of using CRN for delay sensitive applications in the presence of primary users with random ON/OFF periods. The first contribution of this work is the modeling of a cognitive node as a Queuing system and characterization of the average delay...
MPLS-Traffic Engineering (MPLS-TE) provides many recovery mechanisms such as rerouting and protection. Existing one-to-one backup and path-based backup schemes are not resource efficient. We propose Common Protection Path (CPP), a novel protection scheme which selects a common protection path for traffic demands having the same ingress and egress routers. CPP also factors in path failure probability...
Certain Wireless Sensor Network (WSN) applications such as patient monitoring, smart grid and equipment condition monitoring require accurate estimation of specific WSN parameters such as the end-to-end delay, the reliability and the power consumption. The estimation of these parameters calls for an accurate and lightweight WSN model that is suitable for the low processing capabilities of sensor nodes...
A glitch compensation methodology is proposed in this paper which involves reducing the undesired switching of selected combinational cells from a place and routed standard cell layout in order reduce peak dynamic voltage or IR drop. The proposed methodology can be seamlessly integrated to existing physical design flow. A glitch is an undesired transition that occurs before intended value in digital...
We consider the synchronization problem of networked Euler-Lagrange systems with unknown parameters. The information flow in the network is represented by a directed communication graph and is subject to unknown and possibly discontinuous time-varying communication delays with unknown upper bounds. We propose a control scheme that achieves position synchronization, i.e., all the positions of the systems...
In this paper a new current comparator is proposed which offers high speed and high resolution while maintaining low power dissipation. The design improves upon previous Traff current comparator by modifying the given gain stage which leads to up to 83% improvement in delay. Simulation results performed on SPICE using TSMC 0.18µm CMOS technology demonstrate that proposed current comparator has a resolution...
Time-interleaved analog-to-digital converters (TIADCs) are essential in wide-band communication systems for providing high-speed data conversion. However, TIADCs are sensitive to the sample time mismatch, which results in significantly degraded performance. A new calibration technique is proposed to minimize sample time mismatches among interleaved channels. Correlation between adjacent channels based...
In high bandwidth, low latency data center networks, when multiple data senders simultaneously communicate with a single receiver, namely in many-to-one communication pattern, the burst data overload the receiver's switch buffers, which leads to TCP throughput collapse. That is so-called TCP In cast problem. It has become a new hot research topic in recent years. And, many proposals have been put...
Due to the progress of network multimedia technology, a majority of real-time multimedia applications need multicast communication to transmit information. These applications require a multicast routing protocol in which packets arrive to multicast receptors within a specified QOS guaranteed. D2V-RPS's problem (delay and delay variation RP Selection) consists in choosing an optimal multicast router...
Cloud computing is a consolidation environment that hosts heterogeneous applications. Currently, clouds use virtualization technologies to provide an isolated execution environment and agile resource provisioning. Furthermore, live migration is widely exploited to achieve energy saving. However, consolidation and live migration can cause resource contention and utilization overhead that influence...
Data aggregation is generally considered an important method used to reduce traffic and increase lifetime of wireless sensor networks in both two- and three-dimensional space. It is challenging to develop efficient data aggregation solution for the wireless sensor networks since quality-of-service, such as end-to-end delay, is considered as a severe criterion required in many scenarios. In this paper...
Wireless Mesh Networks (WMNs) are currently attracting a lot of attention due to their ability to provide cost-efficient broadband wireless connectivity. In this paper, we evaluate the performance of a WMN by simulations considering packet delivery ratio (PDR), throughput and delay. For simulations, we used ns-3 simulator and Hybrid Wireless Mesh Protocol (HWMP). We evaluate the performance of the...
Voice communication requires stricter QoS than other types of data communication. Thus, network operations, including the MAC layer protocol, should provide specific voice communication handling to meet voice application requirements. The current MIL-STD-188-220 does not guarantee the QoS of voice communication because of the round robin scheduling mechanism in network access control. Thus, we propose...
Simulation is one of the most popular evaluation methods in scientific workflow studies. However, existing workflow simulators fail to provide a framework that takes into consideration heterogeneous system overheads and failures. They also lack the support for widely used workflow optimization techniques such as task clustering. In this paper, we introduce WorkflowSim, which extends the existing CloudSim...
This paper proposes message scheduling on dedicated time slot of ISA100.11a to satisfy real time property. In this paper, a superframe is designed to accommodate periodic real time (PRT) message, aperiodic real time (alarm) message, and non real time (NRT) message. To do so, a superframe is divided into dedicated time slot (DTS) which is used to send PRT message and shared time slot (STS) which is...
This paper describes the congestion resolution mechanism adopted in the network interfaces of the 3-Level Integrated Hybrid Optical Network (3LIHON). In 3LIHON, three service levels, namely guaranteed transparent service, real time statistically multiplexed packet service, and best effort basic Internet service are considered. The proposed mechanism is designed to meet Quality-of-Service requirements...
The HSPA mobile wireless technology is now widely used and is expected to gradually converge with next-generation broadband technologies. As such, 3GPP focuses on HSPA advances beyond Release 10 including “Further Enhancements to CELL_FACH”. In CELL_FACH state, the UE can transmit smaller amounts of data, while taking advantage of significantly less power consumption. Recently, the usage of CELL_FACH...
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