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Penn State Uni

Pennsylvania State University

Penn State University

MATLAB - realmin Problem or BUG

A new problem/bug found in MATLAB

Real max of MATLAB is:
real max = 2 ^ 1024 - 1
That is the same as realmax of MATLAB!
To calculate you should get the series as 2 ^ 1023 + 2 ^ 1022 + 2 ^ 1021 + 2 ^ 1020 + ...

Real min of MATLAB is:
real min = 2 ^ -1074
BUT realmin of MATLAB = 2 ^ -1022
To prove the real min of MATLAB, you could test so many equation. You'll get that no change in the value!
Because the assigned bits to this floating point system is 53 = ( 1074 - 1022 ) + 1

By:
Diman Zad Tootaghaj
Farshid Farhat

Three apples change the world

Three apples change the world

Problem with Gmail Intrusion Detector

Some ordinary activities detect as suspicious activities!

Recent activity:

If the activity below doesn't look like yours, change your password immediately. Learn more

Access Type [ ? ] (Browser, mobile, POP3, etc.) Location (IP address) [ ? ] Date/Time (Displayed in your time zone) Unknown Germany (stratoserver.net:85.214.81.33) Sep 15 (2 days ago) Browser * Iran 2:33 pm (0 minutes ago) Browser Iran 1:36 pm (57 minutes ago) Browser Iran 12:39 pm (1.5 hours ago) Browser Iran 12:12 pm (2 hours ago) Browser Iran Sep 16 (16 hours ago) Browser Iran Sep 16 (18 hours ago) Browser Iran Sep 16 (20 hours ago) Browser Iran Sep 16 (1 day ago) Browser Iran Sep 16 (1 day ago) Browser Germany (85.214.81.33) Sep 15 (2 days ago)

Alert preference: Never show an alert for unusual activity. change

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Mahshid Farhat
http://sites.google.com/site/mahshidfarhat/home
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Security Improvement of Ad-hoc Networks Routing Protocol

Security Improvement of Ad-hoc Networks Routing Protocol
ارتقاء امنیت پروتکل های مسیریابی در شبکه های اقتضایی

Game-theoretic approach to mitigate packet dropping in wireless Ad-hoc networks

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Tootaghaj, Diman Zad ; Farhat, Farshid ; Pakravan, Mohammad-Reza ; Aref, Mohammad-Reza ; 
Information Systems and Security Lab (ISSL), Department of Electrical Engineering, Sharif University of Technology, Tehran, Iran

This paper appears in:  Consumer Communications and Networking Conference (CCNC), 2011 IEEE 
Issue Date :  9-12 Jan. 2011 
On page(s): 163 
Print ISBN: 978-1-4244-8789-9 
Digital Object Identifier :  10.1109/CCNC.2011.5766444 
Date of Current Version :   12 May 2011

ABSTRACT

Performance of routing is severely degraded when misbehaving nodes drop packets instead of properly forwarding them. In this paper, we propose a Game-Theoretic Adaptive Multipath Routing (GTAMR) protocol to detect and punish selfish or malicious nodes which try to drop information packets in routing phase and defend against collaborative attacks in which nodes try to disrupt communication or save their power. Our proposed algorithm outranks previous schemes because it is resilient against attacks in which more than one node coordinate their misbehavior and can be used in networks which wireless nodes use directional antennas. We then propose a game theoretic strategy, ERTFT, for nodes to promote cooperation. In comparison with other proposed TFT-like strategies, ours is resilient to systematic errors in detection of selfish nodes and does not lead to unending death spirals.

Risk of attack coefficient effect on availability of Ad-hoc networks

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Tootaghaj, Diman Zad ; Farhat, Farshid ; Pakravan, Mohammad-Reza ; Aref, Mohammad-Reza ; 
Information Systems and Security Lab (ISSL), Department of Electrical Engineering, Sharif University of Technology, Tehran, Iran

This paper appears in:  Consumer Communications and Networking Conference (CCNC), 2011 IEEE 
Issue Date :  9-12 Jan. 2011 
On page(s): 166 
Print ISBN: 978-1-4244-8789-9 
Digital Object Identifier :  10.1109/CCNC.2011.5766445 
Date of Current Version :   12 May 2011

ABSTRACT

Security techniques have been designed to obtain certain objectives. One of the most important objectives all security mechanisms try to achieve is the availability, which insures that network services are available to various entities in the network when required. But there has not been any certain parameter to measure this objective in network. In this paper we consider availability as a security parameter in ad-hoc networks. However this parameter can be used in other networks as well. We also present the connectivity coefficient of nodes in a network which shows how important is a node in a network and how much damage is caused if a certain node is compromised.