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The programmability of Software-Defined Networking (SDN) challenges the correctness and reliability of networks. There may be design flaws as well as implementation bugs in SDN applications. White-box testing methods with formal models rely on source codes, which limits the applicability of these methods. Black-box methods without behavior models cannot systematically cover an application's functions...
In this paper, we propose voltage converter with high efficiency over wide input voltage. This converter is suitable for the solar panel for WSN applications where the only power source is a solar cell that outputs highly variable voltage. The aim is to achieve this by using multiple converter topologies in parallel. Use of such converter has a meaning in renewable resources that in the long term...
MeteoSwiss, the Swiss national weather forecast institute, has selected densely populated accelerator servers as their primary system to compute weather forecast simulation. Servers with multiple accelerator devices that are primarily connected by a PCI-Express (PCIe) network achieve a significantly higher energy efficiency. Memory transfers between accelerators in such a system are subjected to PCIe...
This paper presents an evaluation and comparison of three topologies that are popular for building interconnection networks in large-scale supercomputers: torus, fat-tree, and dragonfly. To perform this evaluation, we propose a comprehensive methodology and present a scalable packet-level network simulator, TraceR. Our methodology includes design of prototype systems that are being evaluated, use...
The simulation of current source modular multilevel converter (CSMMC) based systems with large number of submodules require significant computational efforts. In this paper, a simplified model of CSMMC is developed to reduce the computational complexity while maintaining the accuracy of the traditional detailed model. The model is constituted using controlled current sources in each arm of the converter...
We measured InfiniBand traffic in our full fat tree fabric and measured performance impact of trimming the fabric on our major application kernels. Based on traffic pattern analysis and application performance impact we infer that a 2:1 trimmed fat tree is a cost effective alternative to a full fat tree for this specific set of applications. The methodology we used may be useful for others who are...
Modeling of power converters is usually done using cycle-average or piecewise-linear methods. Piecewise-linear methods operate by selecting the model corresponding to the current switching state. When the amount of possible states increase, the number of models increases as well. For model-predictive control (MPC), this results in an increasing computational effort, which limits the applicability...
In the SDN approach, the control and data planes are separated to enable programmability and interoperability, the control plane being logically centralized. Scalability and reliability are key properties for the SDN control plane. In WAN deployments, it is already envisioned as physically distributed to span across the networks and avoid single point of failure. In this paper, we tackle the problem...
Transmission switching as a powerful tool is utilized to change network topology during operations which, in turn, would lead to higher economic benefits of a power system. However, network reconfiguration includes a chain of time sequencing switching actions which can bring disturbances into systems. This paper proposes a model addresses the process of transmission switching. The objective is to...
Transmission topology control (line switching) is currently practiced with manual and ad-hoc based actions by ISO control room personnel who rely on a combination of past experience and a fixed data set of line openings linked to various congestion patterns. Our previous work used sensitivity information from the solution of a DC economic dispatch problem to develop topology control algorithms that...
Transmission topology control (line switching) is currently a manual operator intervention by power system operators implemented on an ad-hoc basis and relying on either the operators' previous experience or on a set of fixed procedures linking congestion with topology changes. While the co-optimization of network topology and generation resources has been shown to provide significant congestion cost...
We present a parallel implementation of three transmission switching algorithms. The first is based on a parallel search of all candidate lines, the second is based on a priority listing of lines and the third is based on decomposing the set of candidate lines in smaller subsets that are solved in parallel. We present a duality result that justifies the priority listing of the second algorithm. The...
With continuing miniaturization, NoCs with 1024 nodes will become realistic around the year 2020. The design of such NoCs requires efficient simulation techniques to evaluate design alternatives and to validate functional correctness. The current state of the art, sequential simulation, will no longer provide acceptable simulation time. Parallel simulation exploiting multicore and multithreading capabilities...
An accurate average modeling technique for power converters is important in order to be able to analyze the converters and design proper control laws. The classical technique works well under the slow dynamics assumption in the state space variables. For certain power converters, such as switched capacitor converters, this assumption is not satisfied. This article searches to validate a new technique...
This paper deals a computer-based integrated design and optimization approach of power electronic circuits which is adapted to two inverter topologies, namely the six-pulse (B6) and the Bipolar Switched Neutral Point Clamped (BSNPC) topology. The approach comprises apart from the optimization method itself the analytic behavioural modelling of the topologies and the loss modelling of the devices....
In this paper, we propose and analyze an analytical propagation model of a vulnerability mitigation worm (Seawave). The model takes into consideration the topology structure of enterprise networks such as switches, LANs, and backbone, proposing the first computer worm that use layer two of the OSI model as its main propagation medium. The model also addresses the worm's communication delays due to...
Transmission elements are traditionally treated as non-dispatchable asset in the network. Co-optimizing transmission topology and generation dispatch could be a viable way to further maximize the market surplus and improve economic efficiency. This paper will discuss the mathematical formulation of optimal transmission switching. The benefit gain by deploying the transmission switching model will...
Reasonable and effective communication simulation model is an important basic constitutes of joint operations simulation. The communication delay computation of the communication model is the prerequisite of high-level operational simulation. Combing with the high-level, complex communication network types and structure characteristics of joint operations simulation system, the paper put forward the...
Simulation of many dynamic real world systems such as the Internet and social networks requires developing dynamic models for the underlying networks in these systems. Currently, there is a large body of work devoted towards determining the underlying mechanisms that create these networks, but the resulting models have not realistically captured many of the important structural characteristics when...
The conception of Network-on-Chip (NoC) presents system designers with a new approach to the design of on-chip interconnection structures. However, such networks present designers with a large array of design parameters and decisions, many of which are critical to the efficient operation of NoC systems. To aid the design process of complex systems-on-chip, this paper presents a NoC simulation environment...
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