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This paper proposes two wavelength overprovisioning strategies that can be used to improve the performance of path restoration in optical core networks under dynamic traffic conditions while considering single fiber link failure scenarios. The study presented in the paper shows that with the two proposed schemes it is possible to achieve nearly the same level of average connection availability and...
This article presents a case study and comparison of simulations carried out by SimPy 3.0 of Python module and OMNeT++ tool to explore the performance. The target of this comparison is in particular configuration of network for future steps what tools would be good to use. Two simple models of a network were created with Python and C++ language.
A novel direct ac-ac converter based on the switched-capacitor and series resonant principle, featuring with soft switching characteristic and bidirectional power flow, is proposed in this paper. The converter consists of a LC resonant tank, switched-capacitors and reverse blocking IGBTs (RB-IGBT), resulting in small size and light weight; high efficiency is achieved by adopting soft switching technology...
According to the peak hours of the day, the number of sensed primary users (PUs) and also requesting secondary users (RSUs) will be dramatically increased. Since the radio spectrum is a limited resource, efficient spectrum management techniques on cognitive radio is necessary to manage all PUs, active secondary users (ASUs) and RSUs where all three types of the users have unknown activity ratios....
In this paper a 2 MW dc-dc converter is presented and design criteria are carried out. It deals with the preliminary design for the hardware implementation. The power supply shall have multiple targets such as an PV emulator or supply for a dc-micro grid in the research facility National Center for Reliable Electric Power Transmission of the University of Arkansas. The converter is designed for an...
In this paper, a multilevel capacitor clamped buck converter is investigated for AC-AC applications. The proposed topology significantly improves the flexibility of distribution systems in applications such as data centers and residential / industrial power distribution in urban settings. This paper discusses the operation and control of the proposed topology for a load of 50 kVA and 0.9 power factor,...
Due to the rapid growth of Software-Defined Networks, we can manage network traffic easier than before. One of the major issues on SDN is the multipath routing protocols due to its complexity of optimum path selection among the multiple routes. In this paper, we focus on Multipath TCP (MPTCP). MPTCP is an extension of TCP that increases the throughput of TCP communication significantly by utilizing...
In this paper, an open-switch fault diagnosis method for five-level H-Bridge Neutral Point Piloted (HB-NPP) or T-type converters is proposed. While fault tolerant operation is based on three steps (fault detection, fault localization and system reconfiguration), a fast fault diagnosis, including both fault detection and localization, is mandatory to make a suitable response to an open-circuit fault...
A reliable offset cancelation strategy is proposed for single-stage latched comparators by in turn domination of positive and negative feedback devices. Feedback type is cautiously swapped by small voltage variations on bulk terminals of PMOS devices. For offset cancellation, at first a reset switch removes the previously latched data on comparator's outputs while the inputs are shorted together....
For most of the Multilevel Converter (MC) applications a commonly discussed issue is the maintenance of balance between the energy storage elements from the SubModules (SM). In applications where a battery pack is also part of the SM storage, such as STATCOMs or motor drives, the SM voltage is not in linear relation with the State Of Charge (SOC) of the entire battery; thus, the balancing becomes...
Factory acceptance tests performed on High Voltage Direct Current (HVDC) transmission apparatus usually involve the application of high direct voltage and switching impulse voltage in separate withstand tests used to qualify the insulation system. However, the actual stress subjected to the equipment insulation system while in-service on the HVDC transmission system, is a switching surge transient...
In Content Centric Networking (CCN), registered data objects are frequently modified by users due to individual requirements, which results in downloading vulnerability to nodes. The overall consistency of data stored in multiple nodes is affected by two major factors, the changes in data content and the loss of data on each host, which significantly impacts the correctness and usability in the networks...
This paper develops an algorithm for energy management of a distribution network considering a restorative plan for most possible devastating contingencies in the network. The distribution network is self-healing and consists of smart meters and remotely controlled automated switches. Distributed energy resources and flexible loads provide the redundant capacity for restoration. Under normal operating...
Kinetic Monte Carlo simulations are performed to investigate the switching characteristics of resistive random access memory. The simulation results reveal that the switching probability distribution against the voltage pulse width is well fitted by the lognormal curve, which would originate from the drift-diffusion mechanism for the ion transport in the insulating film.
This work investigated nine popular integration algorithms and simulated the DC-DC boost converters, with and without parasitic elements, operating in continuous conduction mode (CCM). The off-line simulations were performed under the Matlab environment. The methodology consisted of firstly, deriving the state-space model of the converter and then deriving its small-signal average model. The average...
This paper presents a discrete time fully differential CMOS signal conditioning circuit for acquisition of biosignals. It is realized using switched capacitors (SC), which provides reconfigurability, high precision, high CMRR and low sensitivity to temperature and process variations. However, the SC circuit suffers from various errors like charge injection and clock feedthrough which have an impact...
A multiplier requires an Adder circuitry to add carry of previous result to next stage to form partial products and to get final result of multiplication. This paper presents a novel way to implement Line Multiplier without using Adders. The Adder-less Multiplier is implemented on both CMOS and FPGA platforms. In ASIC paradigm CMOS 90nm technology and on FPGA platforms Spartan-3 have been used for...
The demand for the design and implementation of efficient crossbar arbiters has raised due to advancement in network-on-chip communication. The function of arbiters is to resolve contention among different i/o ports accessing a common resource. Digital circuits such as multiplexers are building blocks for the implementation of such arbiters in order to provide the best connectivity. The major challenge...
In this paper, a simplified analytical frequency model of conducted EMI generated by a DC/DC converter is proposed. The methodology is based on the relationship between the noise source and the propagation path. The effect of the parasitic elements was taken into account in the noise sources waveforms. The proposed method was verified by comparing the improved models results with the time domain simulation...
This paper proposes a novel method for ripple cancellation in multi-phase converters. Unlike the conventional multi-phase converter, the proposed topology can cancel the ripple irrespective of the duty ratios. The proposed topology is designed to give 3.3V output for wide supply range of 4.5 to 18V and load range of 0 to 3A in AMS 0.35um high-voltage CMOS process. Transistor level simulation results...
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