scholarly journals Research of authentication failure and ARP inject attacks and methods of their detection in IEEE 802.11 networks

Telecom IT ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 87-98
Author(s):  
M. Kovtsur ◽  
A. Kistruga ◽  
G. Voroshnin ◽  
A. Fedorova
Keyword(s):  
Wireless Networks ◽  
Information Security ◽  
Ieee 802.11 ◽  
High Efficiency ◽  
Main Idea ◽  
Public Places ◽  
Address Resolution Protocol ◽  
802.11 Networks ◽  
The World ◽  
Work Done

Nowadays, Wi-Fi technology is used everywhere in the world: in the offices of large companies, public places and in simple home premises. However, the use of a public transmission medium leads to the possibility of various attacks. This article discusses attacks such as authentication failure and Address Resolution Protocol inject. The considered attacks have shown high efficiency and danger for wireless networks. In this connection, methods of detection and protection against them were proposed. Methods. At the first stage, the concept of how attacks work, their main idea and purpose, were analyzed. At the subsequent stages, for testing, a laboratory stand was created, on which they were simulated. In the course of the experiments, the effectiveness of attacks was found out, and the main phases of attacks and the elements that contribute to their detection were graphically reflected in the article. Main results. As a result of the work done, it was possible to isolate attack vectors and identify their accompanying anomalies. Based on the research materials, mechanisms for detecting and preventing the attacks under consideration were developed. The practical part. All theoretical and experimental materials collected in the article can be used in detecting and preventing attacks on wireless networks by network administra-tors and information security specialists.

scholarly journals A Software-Defined Networking Framework to Provide Dynamic QoS Management in IEEE 802.11 Networks

Sensors ◽  
2018 ◽  
Vol 18 (7) ◽  
pp. 2247 ◽  
Author(s):  
Pilar Manzanares-Lopez ◽  
Josemaria Malgosa-Sanahuja ◽  
Juan Muñoz-Gea
Keyword(s):  
Wireless Networks ◽  
Ieee 802.11 ◽  
Window Size ◽  
Software Defined Networking ◽  
Channel Access ◽  
Access Points ◽  
Physical Layers ◽  
802.11 Networks ◽  
Ieee 802.11 Networks ◽  
Set Up

In this paper, the concept of SDN (Software Defined Networking) is extended to be applied to wireless networks. Traditionally, in a wired SDN environment, the OpenFlow protocol is the communication protocol used to configure the flow table of forwarding elements (i.e., switches and Access Points). However, although in IEEE 802.11 networks there is no concept of forwarding, the SDN paradigm could also be applied to set up the wireless network dynamically, in order to improve the performance. In this case, not only the network elements, that is the Access Points, but also the mobile elements should configure their link and physical layers parameters following the guidelines of a centralized SDN controller. In particular, we propose a mechanism called DEDCA (Dynamic Enhanced Distributed Channel Access) to manage the channel access in wireless networks, and a framework that enables its implementation in 802.11-based wireless networks using SDN technology. The key aspect of this alternative solution is the control over the contention window size of the wireless terminals. Thus, an adequate response to dynamic and short-term Quality of Service (QoS) requirements can be offered to services running on these networks. DEDCA mechanism relies upon the use of a scalar parameter called gain. The mathematical model which has allowed us to obtain this parameter is presented and evaluated in this paper. Finally, the usefulness of the proposed solutions have been evaluated by means of their implementation in an example case.

scholarly journals World and Turkey over the past twenty years chicken examination of the production, consumption export and import

2021 ◽  
Vol 11 (1) ◽  
pp. 053-059
Author(s):  
Emre Aydemir ◽  
Yasin Özel ◽  
Erdener Altın
Keyword(s):  
High Efficiency ◽  
Production Capacity ◽  
Chicken Meat ◽  
The Body ◽  
Animal Origin ◽  
Meat Production ◽  
Balanced Diet ◽  
Quality Product ◽  
The World ◽  
Work Done

One of the most important conditions of a healthy and balanced diet is the daily amount of vitamins, minerals, water, carbohydrates, fat, and protein that the body needs to be met from vegetable and animal origin products. Among the products of animal origin, chicken meat is both cheap and; it is a quality product. High-efficiency lines have been obtained with various breeding and selection studies carried out on poultry animals for many years throughout the world. Especially in recent years, chicken meat has attracted attention with its rich amount of nutrients. One of the biggest reasons for this is the rapid increase in production and consumption over the years. Worldwide USA, Brazil, China, European Union, India, Russia, Mexico, Argentina, Turkey, Thailand, countries like Indonesia is located in the first take place of chicken meat production. Turkey, especially in the last 30 years, poultry has increased rapidly over the years the production capacity of the work done on. Especially in recent years, a rapid increase has been achieved in exports and imports worldwide. In the World and Turkey with the increase in the production amount over the years, per capita consumption of chicken meat has also increased. In this study, the last two decades the world and Turkey, chicken meat production, consumption, export, and import are intended to provide information about.

scholarly journals Throughput of an IEEE 802.11 Wireless Network in the Presence of Wireless Audio Transmission: A Laboratory Analysis

Sensors ◽  
2021 ◽  
Vol 21 (8) ◽  
pp. 2620
Author(s):  
Ivan Forenbacher ◽  
Siniša Husnjak ◽  
Ivan Jovović ◽  
Mislav Bobić
Keyword(s):  
Wireless Networks ◽  
Wireless Network ◽  
Ieee 802.11 ◽  
Frequency Band ◽  
Industry 4.0 ◽  
Physical Layer ◽  
Seamless Connectivity ◽  
802.11 Networks ◽  
Audio Transmission ◽  
Ieee 802.11 Wireless Networks

Wireless networks, including IEEE 802.11-based or Wi-Fi networks, are inexpensive and easy to install and therefore serve as useful connectivity alternatives in areas lacking wired-network infrastructure. However, IEEE 802.11 networks may not always provide the seamless connectivity and minimal throughput required for Industry 4.0 communications because of their susceptibility to interference from other devices operating in the unlicensed “Industrial, Scientific, and Medical” frequency band. Here we analyzed how a wireless audio transmitter operating on this band influences the throughput of an IEEE 802.11 b/g/n network under laboratory conditions. Wireless audio transmission reduced mean throughput by 85%, rendering the IEEE 802.11 b/g/n network nearly unusable. Our analysis suggests that in order for IEEE 802.11 wireless networks to support Industrial 4.0 applications, attention should be paid to the physical layer as well as the data or upper layers, and critical services should not transmit on the 2.4 GHz band. These findings may contribute to understanding and managing IEEE 802.11 wireless networks in various Industry 4.0 contexts.

An Overview of Wireless Network Concepts

2011 ◽  
pp. 3002-3008
Author(s):  
Biju Issac
Keyword(s):  
Wireless Networks ◽  
Mobile Computing ◽  
Mobile Devices ◽  
Ad Hoc ◽  
Public Places ◽  
University Campuses ◽  
Data Services ◽  
802.11 Networks ◽  
The Many ◽  
Coffee Shops

Wireless networks and the subsequent mobile communication are growing by leaps and bounds in the past years and the demand for connection without cables is certainly high. Nowadays, wireless networks are quite common and can be found on university campuses, corporate offices and in public places like hotels, airports, coffee shops and so forth. Not only are mobile devices getting smaller and cheaper, they are also becoming more efficient and powerful, capable of running applications and network services. This is causing the uncontrollable growth of mobile computing as we are witnessing today. Among the many number of applications and services that are executed by mobile devices, network and data services are in high demand. Brief descriptions of some selective wireless technologies that help mobile computing, like IEEE 802.11 networks (with infrastructure mode and ad-hoc mode), Bluetooth, HomeRF, WiMAX and cellular technologies are given below.

scholarly journals A Modified Otway-Rees Protocol to Overcome Triple MAB Vulnerability

2020 ◽  
Vol 9 (7) ◽  
pp. 496-500
Keyword(s):  
Wireless Networks ◽  
Information Security ◽  
Power Consumption ◽  
Execution Time ◽  
Personal Data ◽  
The World ◽  
Exchange Algorithms ◽  
Points Of View ◽  
The Difference ◽  
World Information

With growth of internet and wireless networks all around the world, information security has taken a central stage to protect commercial and well as personal data. Key exchange algorithms play an important role in information security. In this paper we study the Otway-Rees protocol and its vulnerabilities and propose a modified Otway-Rees protocol to overcome them. We then evaluate performance of the protocol from various points of view such as execution time, encryption speed and power consumption by comparing the original and proposed protocols. We find that although the original protocol is faster, the difference in speed is not significant and the modified protocol protects against vulnerability resulting in the best choice between the two protocols.

Sonic Movements – Spatial Reflexivity

Somatechnics ◽  
2014 ◽  
Vol 4 (1) ◽  
pp. 133-148
Author(s):  
Johanna Hällsten
Keyword(s):  
Alarm System ◽  
Edo Period ◽  
Public Places ◽  
Ongoing Research ◽  
Site Specific ◽  
Rural Environments ◽  
The World ◽  
Architectural Structures ◽  
Sonic Environment ◽  
Sonic Structures

This article aims to investigate the creation of space and sound in artistic and architectural fields, with particular emphasis on the notions of interval and duration in the production and experience of soundscapes. The discussion arises out of an ongoing research project concerning sonic structures in public places, in which Japanese uguisubari ([Formula: see text]) – ‘nightingale flooring’, an alarm system from the Edo period) plays a key role in developing new kinds of site-specific and location-responsive sonic architectural structures for urban and rural environments. This paper takes uguisubari as its frame for investigating and evaluating how sounds create a space (however temporary), and how that sound in turn is created through movement. It thus seeks to unpick aspects of the reciprocal and performative act in which participant and the space engage through movement, whilst creating a sonic environment that permeates, defines and composes the boundaries of this space. The article will develop a framework for these kinds of works through a discussion on walking, movement, soundscape and somatechnical aspects of our experience of the world, drawing upon the work of Merleau-Ponty, Bergson and the Japanese concept of Ma (space-time).

scholarly journals The Main Progress of Perovskite Solar Cells in 2020–2021

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Tianhao Wu ◽  
Zhenzhen Qin ◽  
Yanbo Wang ◽  
Yongzhen Wu ◽  
Wei Chen ◽  
...  
Keyword(s):  
Solar Cells ◽  
High Efficiency ◽  
Perovskite Solar Cells ◽  
Lead Free ◽  
Manufacturing Cost ◽  
Practical Application ◽  
The World ◽  
Photovoltaic Technology

AbstractPerovskite solar cells (PSCs) emerging as a promising photovoltaic technology with high efficiency and low manufacturing cost have attracted the attention from all over the world. Both the efficiency and stability of PSCs have increased steadily in recent years, and the research on reducing lead leakage and developing eco-friendly lead-free perovskites pushes forward the commercialization of PSCs step by step. This review summarizes the main progress of PSCs in 2020 and 2021 from the aspects of efficiency, stability, perovskite-based tandem devices, and lead-free PSCs. Moreover, a brief discussion on the development of PSC modules and its challenges toward practical application is provided.

scholarly journals Research progress of viscoelastic surfactants for enhanced oil recovery

2021 ◽  
pp. 014459872098020
Author(s):  
Ruizhi Hu ◽  
Shanfa Tang ◽  
Musa Mpelwa ◽  
Zhaowen Jiang ◽  
Shuyun Feng
Keyword(s):  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
High Efficiency ◽  
Research Progress ◽  
Surfactant Flooding ◽  
Sweep Efficiency ◽  
The World ◽  
Washing Efficiency ◽  
Viscoelastic Surfactants ◽  
Viscoelastic Surfactant

Although new energy has been widely used in our lives, oil is still one of the main energy sources in the world. After the application of traditional oil recovery methods, there are still a large number of oil layers that have not been exploited, and there is still a need to further increase oil recovery to meet the urgent need for oil in the world economic development. Chemically enhanced oil recovery (CEOR) is considered to be a kind of effective enhanced oil recovery technology, which has achieved good results in the field, but these technologies cannot simultaneously effectively improve oil sweep efficiency, oil washing efficiency, good injectability, and reservoir environment adaptability. Viscoelastic surfactants (VES) have unique micelle structure and aggregation behavior, high efficiency in reducing the interfacial tension of oil and water, and the most important and unique viscoelasticity, etc., which has attracted the attention of academics and field experts and introduced into the technical research of enhanced oil recovery. In this paper, the mechanism and research status of viscoelastic surfactant flooding are discussed in detail and focused, and the results of viscoelastic surfactant flooding experiments under different conditions are summarized. Finally, the problems to be solved by viscoelastic surfactant flooding are introduced, and the countermeasures to solve the problems are put forward. This overview presents extensive information about viscoelastic surfactant flooding used for EOR, and is intended to help researchers and professionals in this field understand the current situation.

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