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An improvement of synchronously rotating reference frame based voltage sag detection for voltage sag compensation applications under distorted grid voltages is proposed. The voltage sag detection is the one of important parts in the voltage sag compensation processes. In the past, the conventional synchronously rotating reference frame (CSRRF) based voltage sag detection is widely used in the voltage...
Parallel cascade control structure is commonly used in the operation of process industries to reject disturbances that have a rapid effect on a secondary measured state, before the primary measured variable is affected. The investigations on PID tuning rules for SISO systems are many; however the literature about synthesis methods for designing and tuning cascade control structures appears to be rather...
A glitch compensation methodology is proposed in this paper which involves in reducing the undesired switching of combinational circuits in order to save dynamic power. 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 circuits. A glitch occurs in CMOS circuits when differential delay...
Software defined radio (SDR) multistandard receiver is an enabling technology for radio evolution. The time-quantized pseudorandom sampling (TQ-PRS) is an advantageous processing for SDR multistandard receiver design. The TQ-PRS allows aliases attenuation leading to a relaxed receiver baseband stage. In this paper, the authors focus on experimental proof of concept of the TQ-PRS-based analog-to-digital...
Collision avoidance mechanisms in broadcasting MAC protocol are important for transmission performance. In this paper, collision avoidance mechanisms in broadcasting MAC protocol are classified and concluded. Based on simulation experience, impact of network load on collision avoidance mechanism performance is analyzed. Simulation results show that, network load is the key affecting collision avoidance...
For the performance evaluation involving wireless mesh networks the concept of simulation is often used instead of measurements within a real environment. This is partly due to the lack of real-world testbeds but also caused by the unsteady nature of wireless mesh networks making it difficult to reproduce results. Typically, no real data is transmitted in simulations as for the calculation of network-related...
In this paper, an output-feedback model reference adaptive controller for networked control systems is developed. The problems of networked control systems such as; transmission delays and data-packets dropout induced by the insertion of data networks in the feedback adaptive control loops are considered. The novelty of the paper consists in the combination of different aspects in networked control...
The main goal of the next generation Internet is to support a wide variety of applications with different Quality-of-Service (QoS) requirements. A multi-service network can be achieved by priority scheduling. When connections setup, packet delay for each priority queue is an important issue for route selection. This paper focuses on the head-of-line (HOL) priority queueing system and provides a simple...
Long Term Evolution (LTE) provides a new radio technology that allows operators to achieve even higher peak throughputs than HSPA+. One of the LTE system performance optimization point is the PDCP buffer management mainly in the downlink. Per bearer PDCP buffers at eNodeB (eNB) hold DL data before it is transmitted over radio interface. This buffered data also contributes towards X2 traffic volume...
Delay tolerant networks are intermittently connected. In this paper, we propose a DTN routing scheme EBR. The scheme is based on the idea of exploiting inter-contact time between mobile nodes to predict the number of nodes with no copy a node will encounter within the expected delay. In EBR, every node with message copies dynamically chooses the number of copies by itself. We evaluate the performance...
Serial link interconnection has generated a lot of attention in on-chip bus design due to its advantages over multibit parallel interconnection in terms of crosstalk, skew, and area cost. However, serializing a multi-bit parallel bus tends to increase the bit transition and power dissipation. This paper proposes an embedded transition inversion (ETI) coding scheme that uses the phase difference between...
This paper studies two online scheduling problems on parallel machines that process computing jobs arriving stochastically in a batch pattern. With the objective function as minimizing total completion time of weighted jobs or minimizing total latency of job completion, we propose two solutions for above scheduling problems, respectively. With the assumption that the processing time of a batch is...
We present sensing mechanisms that can be used for implicit high-load and overload detection in SIP networks. By means of measurements and simulations we highlight the characteristics of SIP proxy servers for different load situations and using different transport protocols. Each protocol yields to distinctive patterns that encourage deriving an algorithm that is able to estimate a downstream server's...
A reliable and secure communication network plays a significant role in Smart grid systems, which aims at coordinating generation, transmission, distribution, and consumption parts in power system. The scope of our work ranges from utility level to end consumption level. The major difficulties in this work can be summarized as follows: 1) Performance requirements from the viewpoint of network have...
In this paper, we reported an adaptive priority toggle asynchronous tree arbiter for Address Event Representation (AER)-based image sensors. Simultaneous requests from event-triggered pixels, event latency, timing error and jitter are the inherent issues in AER-based read-out circuits. Fixed priority arbiter often results in unfair allocation of bus resource to only “privileged” pixels thus resulting...
MapReduce is an important paradigm to support modern data-intensive applications. In this paper we address the challenge of modeling performance of one implementation of MapReduce called Hadoop Online Prototype (HOP), with a specific target on the intra-job pipeline parallelism. We use a hierarchical model that combines a precedence model and a queuing network model to capture the intra-job synchronization...
This paper presents framework and tools for exploiting simulation, in various form, in support of design of Smart Grids. The novel capabilities that the simulation should possess are presented with focus on the integration of communications in the design process. Sample design applications are presented. The design process is then outlined at the conceptual level.
Traffic signal control is a challenging task for traffic systems. As fuzzy logic is proved to be well suited to control some complex systems with uncertainties and human perception, it has been widely used to control the traffic signal in recent years. This paper proposes a novel fuzzy logic controller for signalizing modern roundabouts. Different from existing fuzzy traffic-signal controllers, the...
Most of Internet traffics are generated by peer-to-peer(P2P) file sharing applications. The main idea of P2P file sharing applications is that when a peer contributes a file with higher rate, the rate that the peer is able to download files from other peers will also be high. The mechanism works well in a bandwidth symmetric network. However, when a peer shares a large amount of files to other peers...
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