این برنامه جمع اعداد بزرگ(بیش از50رقم)بااستفاده از الگوریتم موازی می باشد که اجرای یک برنامه روی سیستم های چند پردازنده ایی شبیه سازی شده است.این برنامه قابلیت تشخیص اینکه شما به چند پردازنده نیاز دارید باتوجه به تعداد ارقام وارد شده را دارد.مناسب برای پروژه درس الگوریتم موازی درکارشناسی ارشد مهندسی کامپیوتر.
OPERA: An Optimal Progressive Error Recovery Algorithm for Wireless Sensor Networks
Saad Bin Qaisar and Hayder Radha
Department of Electrical and Computer Engineering
Michigan State University
East Lansing, MI-48824, United States
Abstract—Wireless Sensor Networks (WSNs) require
robustness against channel induced errors while retransmission
based schemes prove too costly for energy constrained
sensor nodes. Channel coding with low rates can
ensure increased reliability, and it can eliminate the need
for costly retransmissions. However, low channel coding
rates on an end-to-end basis (between a source sensor
and a destination base-station) requires a large number
of transmissions of redundant data. In this paper, we
propose an Optimal Progressive Error Recovery Algorithm
(OPERA) over WSNs. Under OPERA, individual
intermediate sensors, which are relaying data toward the
base station, partially and optimally channel-decode the
incoming packets while employing a progressive decrease
in parity bits as data reaches the final destination. OPERA
requires significantly lesser processing than would be
required for complete decoding or full decoding/encoding
at the sensor nodes; and OPERA significantly reduces the
total number of transmissions when compared to optimal
end-to-end channel coding schemes. We use iteratively
decodeable LDPC codes for this purpose. OPERA not
only provides a partial processing framework, but also
an algorithm to optimally map the decoding iterations
over the multi hop network. We provide a comparison
between our iteration assignment scheme and random
iteration assignment, and show that our scheme performs
considerably better. Finally, while being naturally motivated
by the sensor reachback problem, we further develop
a fairness-based OPERA scheme for the allocation of
channel-decoding LDPC iterations to sensor nodes taking
into consideration the life-expectancy of each sensor.
Title: An Efficient Novel Key management scheme using NchooseK algorithm for Wireless Sensor Networks
Author(S) :Harjot Bawa1, Parminder Singh2 and Rakesh Kumar3
Journal/Conference Name: International Journal of Computer Networks & Communications (IJCNC)
4 :Volume
Year: 2012
6:Issue
Pages: all
Abstract
In Wireless Sensor Networks Key Management is a very challenging phenomenon. This paper gives an
illustration and demonstration of mathematical model of new key management scheme which overcomes
the limitation of Pre-Shared key scheme, which is extensively used in wireless sensor networks by most of
the vendors. The environment of WSN is challenged by many limitations due to which there is an urgent
need to manage memory which is consumed while provisioning of the key in the wireless sensor network
by using N-chooseK algorithm. We were successfully able to build a more reliable network in terms of
network connectivity .Secondly it offers a scalable solution as there is no need to keep key material of all
the network in each sensor node.
در صورت بروز مشکل در دانلود مقاله یا سوال با آدرس ایمیل projectsara.ir@gmail.com مکاتبه نمایید.
با تشکر