Failure propagation in interdependent multi-level networks

2021 ◽  
pp. 76-90
Author(s):  
А.А. Брусков
Keyword(s):  
Data Storage ◽  
Network Survivability ◽  
New Approach ◽  
Space Network ◽  
Space Networks ◽  
Failure Propagation ◽  
The Common ◽  
Multi Level ◽  
Heterogeneous Nodes ◽  
Level Aspect

В этой работе разрабатываются новый подход и алгоритмические инструменты для моделирования и анализа живучести сетей с разнородными узлами, а также рассматривается их применение в космических сетях. Космические сети позволяют совместно использовать ресурсы космических аппаратов на орбите, такие как хранение, обработка и обмен данными. Каждый космический аппарат в сети может иметь различный состав и функциональность подсистем, что приводит к неоднородности узлов. Большинство традиционных анализов живучести сетей предполагают однородность узлов и в результате не подходят для анализа космических сетей. Эта работа предполагает, что гетерогенные сети могут быть смоделированы как взаимозависимые многоуровневые сети, что позволяет проводить анализ их живучести. Многоуровневый аспект фиксирует разбивку сети в соответствии с общими функциональными возможностями в различных узлах и позволяет создавать однородные подсети, в то время как аспект взаимозависимости ограничивает сеть для захвата физических характеристик каждого узла. In this paper, we develop a new approach and algorithmic tools for modeling and analyzing the survivability of networks with heterogeneous nodes, and also consider their application in space networks. Space networks allow the sharing of spacecraft resources in orbit, such as data storage, processing, and exchange. Each spacecraft in the network may have a different composition and functionality of subsystems, which leads to heterogeneity of nodes. Most traditional network survivability analyses assume node homogeneity and as a result are not suitable for space network analysis. This work suggests that heterogeneous networks can be modeled as interdependent multi-level networks, allowing analysis of their survivability. The multi-level aspect captures the network breakdown according to the common functionality in different nodes and allows for the creation of homogeneous subnets, while the interdependence aspect restricts the network to capture the physical characteristics of each node.

scholarly journals A New Approach to the PWM Modulation for the Multiphase Matrix Converters Supplying Loads with Open-End Winding

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 466
Author(s):  
Pawel Szczepankowski ◽  
Natalia Strzelecka ◽  
Enrique Romero-Cadaval
Keyword(s):  
Pulse Width Modulation ◽  
Harmonic Distortion ◽  
Simulation Software ◽  
Common Mode ◽  
New Approach ◽  
Matrix Converters ◽  
Load Voltage ◽  
Common Mode Voltage ◽  
The Common ◽  
Open End Winding

This article presents three variants of the Pulse Width Modulation (PWM) for the Double Square Multiphase type Conventional Matrix Converters (DSM-CMC) supplying loads with the open-end winding. The first variant of PWM offers the ability to obtain zero value of the common-mode voltage at the load’s terminals and applies only six switches within the modulation period. The second proposal archives for less Total Harmonic Distortion (THD) of the generated load voltage. The third variant of modulation concerns maximizing the voltage transfer ratio, minimizing the number of switching, and the common-mode voltage cancellation. The discussed modulations are based on the concept of sinusoidal voltage quadrature signals, which can be an effective alternative to the classic space-vector approach. In the proposed approach, the geometrical arrangement of basic vectors needed to synthesize output voltages is built from the less number of vectors, which is equal to the number of the matrix converter’s terminals. The PWM duty cycle computation is performed using only a second-order determinant of the voltages coordinate matrix without using trigonometric functions. A new approach to the PWM duty cycles computing and the load voltage synthesis by 5 × 5 and 12 × 12 topologies has been verified using the PSIM simulation software.

Improved multi-level data storage properties of germanium-antimony-tellurium films by nitrogen doping

2017 ◽  
Vol 141 ◽  
pp. 120-124 ◽  
Author(s):  
Xiao Yu ◽  
Yue Zhao ◽  
Chao Li ◽  
Chaoquan Hu ◽  
Liang Ma ◽  
...  
Keyword(s):  
Data Storage ◽  
Nitrogen Doping ◽  
Level Data ◽  
Multi Level ◽  
Storage Properties

scholarly journals The Birth of the Soviet School of European Integration Studies. Part 2

2020 ◽  
pp. 46-53
Author(s):  
Yuri Borko ◽  
Keyword(s):  
European Integration ◽  
Economic Integration ◽  
World Economy ◽  
Focal Point ◽  
Custom Union ◽  
Soviet Leadership ◽  
New Approach ◽  
Bilateral Relations ◽  
The Common ◽  
Integration Problems

The first part of the article shows that in the mid-1960s some Soviet researchers of the European integration problems concluded that integration did not correspond to the Leninist-Stalinist theory of the general crisis of capitalism. On the contrary, it corresponded to some Western concepts of the custom union, the common market, and economic integration. A new approach to the European integration studies was offered by the Institute of World Economy and International Relation (IMEMO), established in 1956. For many decades IMEMO was serving as the focal point for the European integration studies, and was providing the Soviet leadership with analytical information. The number of inquiries from authorities increased significantly. Firstly, it can be explained by the achievements of integration. Secondly, it was due to the growth of economic cooperation between the USSR and the EEC. Thirdly, Moscow defined new foreign policy priorities towards Western countries including Europe. There were two turning-points of bilateral relations: with France – in 1966, and with Germany – in 1969. The Organization for security and cooperation in Europe (OSCE) was established during final session of the top-level Conference of European States in Helsinki in August 1975. Fourthly, experience of the EEC was relevant for the COMECON

NEW APPROACH TO MULTI-LEVEL PROCESSOR SCHEDULING

2010 ◽  
Vol 19 (03) ◽  
pp. 335-346 ◽  
Author(s):  
SAMANEH HOSSEINI SEMNANI ◽  
KAMRAN ZAMANIFAR
Keyword(s):  
Fitness Function ◽  
Systems Design ◽  
Heuristic Function ◽  
Problem Space ◽  
New Approach ◽  
Processor Scheduling ◽  
Quantum Time ◽  
Multi Level ◽  
Evaluation Parameters

The problem of finding the best quantum time in multi-level processor scheduling is addressed in this paper. Processor scheduling is one of the most important issues in operating systems design. Different schedulers are introduced to solve this problem. In one scheduling approach, processes are placed in different queues according to their properties, and the processor allocates time to each queue iteratively. One of the most important parameters of a processor's efficiency in this approach is the amount of time slices associated to each processor queue. In this paper, an ant colony optimization (ACO) algorithm is presented to solve the problem of finding appropriate time slices to assign to each processor queue. In this technique, each ant tries to find an appropriate scheduling. Ant algorithm searches the problem space to find the best scheduling. The quality of each ant's solution is evaluated using a new fitness function. This fitness function is designed according to the evaluation parameters of each processor queue and also according to the queue theory's relations. Also a heuristic function is presented which prompts ant to select better solutions. Computational tests are presented and the comparisons made with genetic algorithm (GA) and particle swarm optimization (PSO) algorithms which try to solve same problem. The results show the efficiency of this algorithm.

Building Muslim–Buddhist Understanding

2021 ◽  
pp. 173-190
Author(s):  
Imtiyaz Yusuf
Keyword(s):  
Common Ground ◽  
New Approach ◽  
Virtuous Behavior ◽  
The Common

This chapter suggests a new approach for building Muslim–Buddhist understanding through the methodology of parallelism. Recognizing that Islam and Buddhism share the common ground of being directed toward liberation from suffering and hardship caused by inequality, injustice, and oppression, this chapter compares two of their respective teachings to achieve that goal, namely through understanding and applying the Qur’anic teaching of Taqwa—Allah consciousness, that is, recognizing the presence of Divine breath as a means to develop virtuous behavior in a Muslim, and cognizance of Satipatthana/mindfulness, as taught in the Anapanasati Sutta, for development of virtuous behavior in a Buddhist.

Comparative Study of Transmission Line Junction vs. Asynchronously Coupled Junction Diplexers

2021 ◽  
pp. 326-336
Author(s):  
Eugene A. Ogbodo
Keyword(s):  
Comparative Study ◽  
Transmission Line ◽  
New Approach ◽  
Output Response ◽  
The Common

A conventional diplexer with a T-junction transmission line is designed in this work and compared with a new approach of designing a diplexer using the asynchronously coupled resonant junction (ACJ). The use of ACJ is to explore its features associated with enhancing the output response of the diplexer as well as its ease in control and implementation of the external couplings at the common port of an all-resonator-base diplexer. The measured and simulated responses of the diplexers were compared, and they agreed with each other.

Why a New Approach to Medical Ethics Is Needed

2020 ◽  
pp. 9-43
Author(s):  
Rosamond Rhodes
Keyword(s):  
Medical Ethics ◽  
Medical Practice ◽  
Systematic Approach ◽  
Biomedical Ethics ◽  
Common Morality ◽  
Medical Professionalism ◽  
New Approach ◽  
Good Medical Practice ◽  
Everyday Ethics ◽  
The Common

The Trusted Doctor: Medical Ethics and Professionalism rejects the well-entrenched views of medical ethics as everyday ethics or common morality applied to medicine. This chapter lays the foundation for the original account of medical ethics that follows in the book’s succeeding chapters. By presenting vivid examples and general arguments the author demonstrates ways in which the ethics of medicine is distinct and different from common morality. The chapter discusses the most popular common morality views, namely, the four principles approach expounded by Tom Beauchamp and James Childress in Principles of Biomedical Ethics and the ten rules approach presented by Bernard Gert, Charles Culver, and K. Danner Clouser in Bioethics: A Systematic Approach by presenting arguments that challenge their applicability to medical practice. A chart identifies some stark differences between the common morality approach and good medical practice and shows how everyday ethics is incompatible with medical professionalism.

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