The document discusses wireless and mobile computing, specifically focusing on MAC (media access control) layer protocols for wireless networks. It provides an overview of MAC layer issues for wireless networks, classifications of MAC protocols (including contention-based, reservation-based, and scheduling-based), and design goals of MAC protocols such as distributed operation, quality of service support, bandwidth efficiency, and minimizing hidden and exposed terminal problems.
we find out various power aware and data packet rate control with-collision-avoidance (CSMA/CA)-based ad hoc wireless network communication. And identifies that CSMA
we find out various power aware and data packet rate control with-collision-avoidance (CSMA/CA)-based ad hoc wireless network communication. And identifies that CSMA
Distributed Operation
Synchronization
Hidden Terminals
Exposed terminals
Throughput
Access delay
Fairness
Real-time Traffic support
Resource reservation
Ability to measure resource availability
Capability for power control
Adaptive rate control
Use of directional antennas
Distributed Operation
Synchronization
Hidden Terminals
Exposed terminals
Throughput
Access delay
Fairness
Real-time Traffic support
Resource reservation
Ability to measure resource availability
Capability for power control
Adaptive rate control
Use of directional antennas
Medium Access Control :-
1.Distributed Operation
2.Synchronization
3.Hidden Terminals
4.Exposed terminals
5.Throughput
6.Access delay
7.Fairness
8.Real-time Traffic support
9.Resource reservation
10.Ability to measure resource availability
11.Capability for power control
Adaptive rate control
Use of directional antennas
MAC PROTOCOLS FOR AD HOC WIRELESS NETWORKS
Issues in designing a MAC Protocol- Classification of MAC Protocols- Contention based protocols- Contention based protocols with Reservation Mechanisms- Contention based protocols with Scheduling Mechanisms – Multi channel MAC-IEEE 802.11
A Dynamic MAC Protocol for WCDMA Wireless Multimedia NetworksIDES Editor
Existing MAC protocols like TDMA and 802.11
have many disadvantages for scheduling multimedia traffic in
CDMA wireless networks. Our objective is to develop a
dynamic MAC protocol for WCDMA networks to avoid
congestion and improve the channel utilization and
throughput of the bulky real-time flows. In this paper, we
propose to develop a dynamic MAC protocol for wireless
multimedia networks. In the design, we combine the merits of
the CSMA, TDMA MAC protocols with WCDMA systems to
improve the throughput of the multimedia WLAN in a
cellular environment. We use these MAC protocols
adaptively, to handle both the low and high data traffics of the
mobile users. It uses multiple slots per frame allowing
multiple users to transmit simultaneously using their own
CDMA codes. By simulation results, we show that our
proposed MAC protocol achieves high channel utilization and
improved throughput with reduced average delay under low
and high data traffic.
MULTI-HOP BANDWIDTH MANAGEMENT PROTOCOL FOR MOBILE AD HOC NETWORKSIJMIT JOURNAL
An admission control scheme should play the role of a coordinator for flows in a data communication network, to provide the guarantees as the medium is shared. The nodes of a wired network can monitor the medium to know the available bandwidth at any point of time. But, in wireless ad hoc networks, a node must consume the bandwidth of neighboring nodes, during a communication. Hence, the consumption of bandwidth by a flow and the availability of resources to any wireless node strictly depend upon the neighboring nodes within its transmission range. We present a scalable and efficient admission control scheme, Multi-hop Bandwidth Management Protocol (MBMP), to support the QoS requirements
in multi-hop ad hoc networks. We simulate several options to design MBMP and compare the performances of these options through mathematical analysis and simulation results, and compare its effectiveness with the existing admission control schemes through extensive simulations.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Distributed Operation
Synchronization
Hidden Terminals
Exposed terminals
Throughput
Access delay
Fairness
Real-time Traffic support
Resource reservation
Ability to measure resource availability
Capability for power control
Adaptive rate control
Use of directional antennas
Distributed Operation
Synchronization
Hidden Terminals
Exposed terminals
Throughput
Access delay
Fairness
Real-time Traffic support
Resource reservation
Ability to measure resource availability
Capability for power control
Adaptive rate control
Use of directional antennas
Medium Access Control :-
1.Distributed Operation
2.Synchronization
3.Hidden Terminals
4.Exposed terminals
5.Throughput
6.Access delay
7.Fairness
8.Real-time Traffic support
9.Resource reservation
10.Ability to measure resource availability
11.Capability for power control
Adaptive rate control
Use of directional antennas
MAC PROTOCOLS FOR AD HOC WIRELESS NETWORKS
Issues in designing a MAC Protocol- Classification of MAC Protocols- Contention based protocols- Contention based protocols with Reservation Mechanisms- Contention based protocols with Scheduling Mechanisms – Multi channel MAC-IEEE 802.11
A Dynamic MAC Protocol for WCDMA Wireless Multimedia NetworksIDES Editor
Existing MAC protocols like TDMA and 802.11
have many disadvantages for scheduling multimedia traffic in
CDMA wireless networks. Our objective is to develop a
dynamic MAC protocol for WCDMA networks to avoid
congestion and improve the channel utilization and
throughput of the bulky real-time flows. In this paper, we
propose to develop a dynamic MAC protocol for wireless
multimedia networks. In the design, we combine the merits of
the CSMA, TDMA MAC protocols with WCDMA systems to
improve the throughput of the multimedia WLAN in a
cellular environment. We use these MAC protocols
adaptively, to handle both the low and high data traffics of the
mobile users. It uses multiple slots per frame allowing
multiple users to transmit simultaneously using their own
CDMA codes. By simulation results, we show that our
proposed MAC protocol achieves high channel utilization and
improved throughput with reduced average delay under low
and high data traffic.
MULTI-HOP BANDWIDTH MANAGEMENT PROTOCOL FOR MOBILE AD HOC NETWORKSIJMIT JOURNAL
An admission control scheme should play the role of a coordinator for flows in a data communication network, to provide the guarantees as the medium is shared. The nodes of a wired network can monitor the medium to know the available bandwidth at any point of time. But, in wireless ad hoc networks, a node must consume the bandwidth of neighboring nodes, during a communication. Hence, the consumption of bandwidth by a flow and the availability of resources to any wireless node strictly depend upon the neighboring nodes within its transmission range. We present a scalable and efficient admission control scheme, Multi-hop Bandwidth Management Protocol (MBMP), to support the QoS requirements
in multi-hop ad hoc networks. We simulate several options to design MBMP and compare the performances of these options through mathematical analysis and simulation results, and compare its effectiveness with the existing admission control schemes through extensive simulations.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
An Approach to Detecting Writing Styles Based on Clustering Techniquesambekarshweta25
An Approach to Detecting Writing Styles Based on Clustering Techniques
Authors:
-Devkinandan Jagtap
-Shweta Ambekar
-Harshit Singh
-Nakul Sharma (Assistant Professor)
Institution:
VIIT Pune, India
Abstract:
This paper proposes a system to differentiate between human-generated and AI-generated texts using stylometric analysis. The system analyzes text files and classifies writing styles by employing various clustering algorithms, such as k-means, k-means++, hierarchical, and DBSCAN. The effectiveness of these algorithms is measured using silhouette scores. The system successfully identifies distinct writing styles within documents, demonstrating its potential for plagiarism detection.
Introduction:
Stylometry, the study of linguistic and structural features in texts, is used for tasks like plagiarism detection, genre separation, and author verification. This paper leverages stylometric analysis to identify different writing styles and improve plagiarism detection methods.
Methodology:
The system includes data collection, preprocessing, feature extraction, dimensional reduction, machine learning models for clustering, and performance comparison using silhouette scores. Feature extraction focuses on lexical features, vocabulary richness, and readability scores. The study uses a small dataset of texts from various authors and employs algorithms like k-means, k-means++, hierarchical clustering, and DBSCAN for clustering.
Results:
Experiments show that the system effectively identifies writing styles, with silhouette scores indicating reasonable to strong clustering when k=2. As the number of clusters increases, the silhouette scores decrease, indicating a drop in accuracy. K-means and k-means++ perform similarly, while hierarchical clustering is less optimized.
Conclusion and Future Work:
The system works well for distinguishing writing styles with two clusters but becomes less accurate as the number of clusters increases. Future research could focus on adding more parameters and optimizing the methodology to improve accuracy with higher cluster values. This system can enhance existing plagiarism detection tools, especially in academic settings.
Understanding Inductive Bias in Machine LearningSUTEJAS
This presentation explores the concept of inductive bias in machine learning. It explains how algorithms come with built-in assumptions and preferences that guide the learning process. You'll learn about the different types of inductive bias and how they can impact the performance and generalizability of machine learning models.
The presentation also covers the positive and negative aspects of inductive bias, along with strategies for mitigating potential drawbacks. We'll explore examples of how bias manifests in algorithms like neural networks and decision trees.
By understanding inductive bias, you can gain valuable insights into how machine learning models work and make informed decisions when building and deploying them.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
KuberTENes Birthday Bash Guadalajara - K8sGPT first impressionsVictor Morales
K8sGPT is a tool that analyzes and diagnoses Kubernetes clusters. This presentation was used to share the requirements and dependencies to deploy K8sGPT in a local environment.
KuberTENes Birthday Bash Guadalajara - K8sGPT first impressions
W13-L1&2.pptx
1. Wireless and Mobile Computing
Delivered
By
Khadija Manzoor
Department of CS& IT
University of Gujrat
2. Lecture Agenda
The aim of this lecture is to provide the reader
with a comprehensive view of the role and details
of the protocols that define and control access to
the wireless channel, i.e., wireless media access
protocols (MAC) protocols.
Mac layer for Wireless and its issues
MAC Classifications
Design Goals
3. Introduction
In the broadest terms, a wireless network consists of nodes
that communicate by exchanging “packets” via radio
waves.
These packets can take two forms. A unicast packet
contains information that is addressed to a specific node,
whereas a multicast packet distributes the information to a
group of nodes.
The MAC protocol simply determines when a node is
allowed to transmit its packets, and typically controls all
access to the physical layer.
4. Introduction
The specific functions associated with a MAC protocol vary
according to the system requirements and application.
For example, wireless broadband networks carry data
streams with strict quality of service (QoS) requirements.
This requires a complex MAC protocol that can
adaptively manage the bandwidth resources in order to
meet these demands.
Design and complexity are also affected by the network
architecture, communication model, and duplexing
mechanism employed.
5.
6. Issues
The main issues need to be addressed while designing a
MAC protocol for ad hoc wireless networks:
• Bandwidth efficiency is defined at the ratio of the bandwidth
used for actual data transmission to the total available
bandwidth. The MAC protocol for ad-hoc networks should
maximize it.
• Quality of service support is essential for time-critical
applications. The MAC protocol for ad-hoc networks should
consider the constraint of ad-hoc networks.
• Synchronization can be achieved by exchange of control
packets.
7. Issues
The main issues need to be addressed while designing a MAC
protocol for ad hoc wireless networks:
Hidden and exposed terminal problems:
Hidden nodes:
Hidden stations: Carrier sensing may fail to detect
another station.
Fading: The strength of radio signals diminished rapidly
with the distance from the transmitter.
Exposed nodes:
Exposed stations: B is sending to A. C can detect it. C
might want to send to E but conclude it cannot transmit
because C hears B.
Collision masking: The local signal might drown out
the remote transmission.
Error-Prone Shared Broadcast Channel
Distributed Nature/Lack of Central Coordination
Mobility of Nodes: Nodes are mobile most of the time.
8. Near and far terminals
Consider the situation A and B are both sending with the same
transmission power. As the signal strength decreases
proportionally to the square of the distance, B’s signal drowns out
A’s signal.
As a result, C cannot receive A’s transmission.
Now think of C as being an intermediary for sending rights (e.g.,
C acts as a base station coordinating media access). In this case,
terminal B would already drown out terminal A on the physical
layer. C in return would have no chance of applying a fair scheme
as it would only hear B.
9. Near and far terminals
The near/far effect is a severe problem of wireless networks. All
signals should arrive at the receiver with more or less the same
strength.
Otherwise a person standing closer to somebody could always
speak louder than a person further away. Even if the senders were
separated by code, the closest one would simply drown out the
others.
Precise power control is needed to receive all senders with the
same strength at a receiver.
10. issues
The combination of network architecture, communication
model, and duplexing mechanism define the general
framework within which a MAC protocol is realized.
Decisions made here will define how the entire system
operates and the level of interaction between individual
nodes. They will also limit what services can be offered and
define MAC protocol design.
However, the unique characteristics of wireless
communication must also be taken into consideration.
11. issues
Here, we explore these physical constraints and discuss
their impact on protocol design and performance.
Radio waves propagate through an unguided medium
that has no absolute or observable boundaries and is
vulnerable to external interference. Thus, wireless links
typically experience high bit error rates and exhibit
asymmetric channel qualities.
Techniques such as channel coding, bit interleaving,
frequency/space diversity, and equalization increase the
survivability of information transmitted across a
wireless link.
However, the presence of asymmetry means that
13. Design goals of a MAC Protocol
Design goals of a MAC protocol for ad hoc wireless networks
• The operation of the protocol should be distributed.
• The protocol should provide QoS support for real-time traffic.
• The access delay, which refers to the average delay experienced by
any packet to get transmitted, must be kept low.
• The available bandwidth must be utilized efficiently.
• The protocol should ensure fair allocation of bandwidth to nodes.
14. Design goals of a MAC Protocol
• Control overhead must be kept as low as possible.
• The protocol should minimize the effects of hidden and exposed
terminal problems.
• The protocol must be scalable to large networks.
• It should have power control mechanisms.
• The protocol should have mechanisms for adaptive data rate control.
• It should try to use directional antennas.
• The protocol should provide synchronization among nodes.
15. Classifications of MAC protocols
Ad hoc network MAC protocols can be classified into
four types:
• Contention-based protocols
• Contention-based protocols with reservation mechanisms
• Contention-based protocols with scheduling mechanisms
• Other MAC protocols
15
MAC Protocols for Ad Hoc
Wireless Networks
Contention-Based
Protocols
Contention-based
protocols with
reservation mechanisms
Other MAC
Protocols
Contention-based
protocols with
scheduling mechanisms
Sender-Initiated
Protocols
Receiver-Initiated
Protocols
Synchronous
Protocols
Asynchronous
Protocols
Single-Channel
Protocols
Multichannel
Protocols
MACAW
FAMA
BTMA
DBTMA
ICSMA
RI-BTMA
MACA-BI
MARCH
D-PRMA
CATA
HRMA
RI-BTMA
MACA-BI
MARCH
SRMA/PA
FPRP
MACA/PR
RTMAC
Directional
Antennas
MMAC
MCSMA
PCM
RBAR
16. Classifications of MAC Protocols
Contention-based protocols
• Sender-initiated protocols: Packet transmissions are initiated by
the sender node.
• Single-channel sender-initiated protocols: A node that wins
the contention to the channel can make use of the entire
bandwidth.
• Multichannel sender-initiated protocols: The available
bandwidth is divided into multiple channels.
• Receiver-initiated protocols: The receiver node initiates the
contention resolution protocol.
17. Classifications of MAC Protocols
Contention-based protocols with reservation
mechanisms
• Synchronous protocols: All nodes need to be synchronized. Global
time synchronization is difficult to achieve.
• Asynchronous protocols: These protocols use relative time information
for effecting reservations.
18. Classifications of MAC Protocols
Contention-based protocols with scheduling
mechanisms
• Node scheduling is done in a manner so that all nodes are
treated fairly and no node is starved of bandwidth.
• Scheduling-based schemes are also used for enforcing priorities
among flows whose packets are queued at nodes.
• Some scheduling schemes also consider battery characteristics.
Other protocols are those MAC protocols that do not
strictly fall under the above categories.