Carleton University

About: Carleton University is a education organization based out in Ottawa, Ontario, Canada. It is known for research contribution in the topics: Population & Large Hadron Collider. The organization has 15852 authors who have published 39650 publications receiving 1106610 citations.

Expansion Model for the Controller Placement Problem in Software Defined Networks

Abstract: In this letter, we propose a mathematical model for the controller placement problem in Software Defined Networks (SDN). More precisely, given a set of switches that must be managed by the controller(s), the model simultaneously determines the optimal number, location, and type of controller(s) as well as the interconnections between all the network elements. The goal of the model is to minimize the cost of the network while considering different constraints. The simulation results show that the model can be used to plan small scale SDN. When trying to solve larger instances of the problem, the solver is taking too much time and also running out of memory. The proposed model could be used by various enterprises and cloud-based networks to start integrating SDN or plan a new SDN.

Psychopathy in Adolescence: Assessment, Violence, and Developmental Precursors

Abstract: Psychopathy is a serious personality disorder that first manifests itself early in life and persists throughout most of the lifespan. Most clinicians and researchers agree that psychopathy is associated with a constellation of affective, interpersonal, and behavioral characteristics, central to which are a profound lack of remorse or guilt and a callous disregard for the feelings, rights, and welfare of others (Cleckley, 1976; Hare, 1991; Tennent, Tennent, Prins, & Bedford, 1990). Individuals with this disorder are typically described as impulsive, selfish, deceitful, sensation-seeking, and irresponsible. Given these characteristics it is not surprising that psychopaths commit a disproportionate amount of serious repetitive crime and violence and frequently come into contact with the criminal justice system. Despite a substantial body of work dealing with psychopathy in adults, surprisingly little work has focused on the precursors of this disorder. Understanding the antecedents of psychopathy may lead not only to a better understanding of its etiology but also its treatment and perhaps, ultimately, its prevention.

Microplastic abundance and distribution in the open water and sediment of the Ottawa River, Canada, and its tributaries

Abstract: Microplastic pollution is prevalent in the Ottawa River, with all open water samples (n = 62) and sediment samples (n = 10) containing microplastics. The median microplastic concentration of nearsh...

Least sum of squared errors (LSSE) channel estimation

Abstract: A least sum of squared errors (LSSE) channel estimation algorithm is presented for estimating a channel impulse response from a known training sequence. Optimum training sequences are found and tabulated for different channel responses and training sequence lengths. The effect of channel estimation errors on the performance of some data detectors is also investigated. A simple approximation for the expected degradation in performance with channel estimation errors is derived.