Sammouda's Blog

ONG Jamel Nafta Tunisie

2011-01-06T13:45:00.000-08:00

Le Vent du Sud

2011-01-06T13:43:00.000-08:00

Coucher du soleil au sud Tunisien

2011-01-02T11:08:00.000-08:00

Sud Tunisien : Douz

2011-01-02T11:04:00.000-08:00

Sud Tunisien : Matmata

2011-01-02T10:56:00.000-08:00

Chat Ejjerid Sud Tunisien 30-12-2010

2011-01-02T10:51:00.000-08:00

Chat Ejjerid Sud Tunisien 30-12-2010

2011-01-02T10:48:00.000-08:00

Green & Rose

2011-01-02T08:36:00.000-08:00

ISUZU Tunisien

2011-01-02T08:11:00.000-08:00

رمضان كريم 2010

2010-08-10T14:14:00.000-07:00

IC 1805: The Heart Nebula

2009-10-18T04:35:00.000-07:00

Explanation: Sprawling across almost 200 light-years, emission nebula IC 1805 is a mix of glowing interstellar gas and dark dust clouds, its nickname is the Heart Nebula. About 7,500 light-years away in the Perseus spiral arm of our galaxy, stars were born in IC 1805. In fact, near the cosmic heart's center are the massive hot stars of a newborn star cluster also known as Melotte 15, about 1.5 million years young. A little ironically, the Heart Nebula is located in the constellation Cassiopeia. From Greek mythology, the northern constellation is named for a vain and boastful queen. This deep view of the region around the Heart Nebula, cropped from a larger mosaic, spans about 2.5 degrees on the sky or about 5 times the diameter of the Full Moon.

Ref

Amazing natural phenomena to see before it's too late

2009-10-18T03:13:00.000-07:00

Reference

TV Show : Nature's Most Amazing Events

2009-10-11T01:54:00.000-07:00

Origin of current influenza H1N1 virus

2009-10-04T03:09:00.000-07:00

A Triple Sunrise

2009-10-04T02:48:00.000-07:00

Explanation: How can the same Sun rise three times? 2009 July 10, a spectacular triple sunrise was photographed at about 4:30 am over Gdansk Bay in Gdansk, Poland. Clearly, our Sun rises only once. Some optical effect is creating at least two mirages of the Sun -- but which effect? In the vast majority of similarly reported cases, mirages of the brightest object in the frame can be traced to reflections internal to the camera taking the images. Still, the above image is intriguing because a sincere photographer claims the effect was visible to the unaided eye, and because the photographer took several other frames that show variants of the same effect. Therefore, polite readers are invited to debate whether the above image captures a particularly spectacular example of common reflections inside a standard digital camera, shows one of the most spectacular examples of atmospheric lensing yet recorded, or was caused by something completely different.
http://antwrp.gsfc.nasa.gov/apod/ap090804.html

The Same Color Illusion

2009-10-04T02:38:00.000-07:00

Explanation: Are square A and B the same color? They are. Are too. The above illusion, called the same color illusion, illustrates that purely human observations in science may be ambiguous or inaccurate. Even such a seemingly direct perception as relative color. Similar illusions exist on the sky, such as the size of the Moon near the horizon, or the apparent shapes of astronomical objects. The advent of automated, reproducible, measuring devices such as CCDs have made science in general and astronomy in particular less prone to, but not free of, human-biased illusions.

http://apod.nasa.gov/apod/ap091004.html

La Météo aujourd'hui : Images sattelites

2009-09-25T14:53:00.001-07:00

الرضا بقضاء الله وقدره

2009-09-07T13:47:00.000-07:00

دَعِ الأيام تفعـل مـا تشـاء
وطب نفساً إذا حكم القضـاء

ولا تجزع لحادثـة الليالـي
فما لـحوادث الدنيا بقـاء

وكن رجلاً على الأهوال جلداً
وشيمتك السماحـة والوفـاء

وإن كثرت عيوبك في البرايا
وسَرَّك أن يكـون لهـا غطـاء

تستر بالسخاء فكـل عيـبٍ
يغطيه كمـا قيـل السخـاء

ولا تَرَ للأعـادي قـط ذلاً
فإن شماتـة الأعـداء بـلاء

ولا تَرْجُ السماحة من بخيـلٍ
فما في النار للظمـآن مـاء

ورزقك ليس ينقصه التأنـي
وليس يزيد في الرزق العناء

ولا حزن يدوم ولا سـرور
ولا بؤس عليـك ولا رخـاء

إذا ما كنت ذا قلـب قنـوعٍ
فأنت ومالـك الدنيـا سـواء

ومن نزلت بساحتـه المنايـا
فلا أرض تقيـه ولا سمـاء

Great Image from Notional Geographic

2009-08-09T13:19:00.000-07:00

Chi3r

2009-04-05T08:40:00.000-07:00

إذا المـرء لا يرعـاك إلا تكلـفـــــــــاً...
فدعـه ولا تكثـر عليـه التأسـفـــــــــــــا

ففي الناس أبدال وفي الترك راحــة...
وفي القلب صبر للحبيب ولـو جفــــــــــا

فما كل مـن تهـواه يهـواك قلبـــــــه...
ولا كل من صافيته لـك قـد صفـــــــــــــا

إذا لم يكـن صفـو الـوداد طبيعــــــــة...
فلا خير فـي خـل يجـيء تكلفــــــــــــــــا

ولا خير فـي خـل يخـون خليلــــــــــه...
ويلقـاه مـن بعـد المـودة بالجفــــــــــــــا

وينكـر عيشـاً قـد تقـادم عـهــــــــــده...

ويظهر سراً كان بالأمس فـي خفـــــــــــا

Extrait min Mou9addamt Ibn Khaldoun

2009-02-21T14:20:00.000-08:00

My professor Khaled Ouali

2008-04-24T04:05:00.000-07:00

Le phénomène http://malla-fadda.blogspot.com/

2008-01-10T03:10:00.000-08:00

Happy New Year - Hijri 1429

2008-01-08T01:42:00.000-08:00

My freind Karim- On chat

2008-01-07T04:11:00.001-08:00

Sidi Bou said 25-08--07

2008-01-07T03:51:00.000-08:00

Hergla Summer 2007

2008-01-07T01:44:00.001-08:00

LaGoulette Rades Bridge underconstruction - Pont LaGoulette Rades En cours de construction

2008-01-07T01:29:00.000-08:00

Bill Gates recommends Ubuntu

2008-01-04T01:29:00.000-08:00

A Rainy Day - Tunis

2007-12-31T15:12:00.000-08:00

Happy new year 2008

2007-12-31T14:50:00.001-08:00

ESS vs Boca (part 1 )

2007-12-31T13:52:00.000-08:00

ESS vs Boca (part 2 )

2007-12-31T13:49:00.000-08:00

http://fr.youtube.com/watch?v=Na1w1jkyLjg

ESS vs Boca (part 3 )

2007-12-31T13:44:00.000-08:00

http://fr.youtube.com/watch?v=sfB5t3sX2B4

Watch Dog Timers

2007-09-09T02:58:00.001-07:00

A watchdog timer is a piece of hardware that can be used to automatically detect software anomalies and reset the processor if any occur. Generally speaking, a watchdog timer is based on a counter that counts down from some initial value to zero.

The embedded software selects the counter's initial value and periodically restarts it. If the counter ever reaches zero before the software restarts it, the software is presumed to be malfunctioning and the processor's reset signal is asserted. The processor (and the software it's running) will be restarted as if a human operator had cycled the power.

http://89c51.blogspot.com/

Build Your Own ARM Cross Compiler Toolchain

2007-09-09T02:48:00.000-07:00

GNUARM is a set of open source GNU compiler for ARM microcontroller. The toolchain consists of the GNU binutils, GCC compiler set, Newlib and Insight, the graphical user interface to GNU debugger for Windows and Linux. This article will guide the building process of GNUARM toolchain only for Linux users. For Windows users, there have the installer executable EXE files already. www.scienceprog.com has a tutorial on setting up this tool on Windows environment.

Is it possible to hack into a gmail address ? - Really scary

2007-09-09T02:36:00.000-07:00

Who doesn't have a gmail id now a days ? In my honest opinion, I am yet to discover a more user friendly web mail host. Gmail is non-intrusive, provides all the advanced and usable features such as POP3, mail search and much more.

But recently at a Black Hat security convention, Robert Graham, the CEO of errata security, surprised attendees by hijacking a Gmail session on camera and reading the victim’s email. He went even further by demonstrating the attack by taking over another journalist’s Gmail account and then sending emails from that account. Really scary.

So how do you protect yourself from somebody sniffing your email while it is in transit and then hacking into your gmail account ? There is one way to make it much harder for sniffing your mails. That is by sending and receiving mails using Gmail's SSL feature. SSL stands for Secure Sockets Layer and is used to provide secure data transfer across the web, for instance ecommerce sites use SSL to transmit your credit card details. Google provides the SSL feature for gmail and all it takes to enable SSL in Gmail is by typing the address https://mail.google.com instead of http://mail.google.com. Make note of the 's' in 'https'. What this does is instead of encrypting only the username and password, Gmail encrypts the whole mail session and this makes it possible to transfer your mails in a secure manner.

So the next time you decide to log on to your gmail account, use https instead of http and you will be fairly safe from getting your mail sniffed in transit.

http://linuxhelp.blogspot.com/

Linux Kernel Development

2007-08-09T03:11:00.000-07:00

Developing Video IP in a Fully Integrated Design Environment

2007-08-07T23:17:00.000-07:00

Often the implementation of video processing systems requires support for various video and audio standards and involves converting signals from one standard to another. Multimedia applications require processing signals at video rates, whichmeans that simulation should run in realtime during the development process. Typical video processing systems use a microprocessor to control a video pipeline comprising a video source and sink, a large memory for storage of video data, and a video processing system (Figure 1). As you implement and debug the various video algorithms, you will need to verify the functionality through software and hardware simulation. Simulation of video processing applications creates special challenges given the real-time nature of video streams and the enormous amount of video data required per frame.

Figure 1 – Video system diagram

Speech Recognition using FPGA

2007-08-05T23:25:00.001-07:00

FPGA Altera

2007-08-05T23:19:00.000-07:00

High-Performance Image Processing on FPGAs

2007-08-01T01:14:00.000-07:00

The rapid evolution of digital imaging technology, accompanied by huge market demand for cameras and displays in both consumer and industrial segments, presents a significant challenge to device developers who want to create high-quality products. To extract the best possibleimages from capture and display hardware, sophisticated image processing algorithms are available. But their implementation is limited by several factors: the intrinsic complexity of the algorithms; the pressure to reduce bill of materials costs; the need to support a wide variety of developing formats; and the frequent requirement to customize particular device environments. The development and licensing ofimage-processing IP is central to Apical’s business. If the design of a new IP core is hindered by difficulties in coding and verifying RTL, or if a customer has no straightforward way to evaluate and implement the IP in their products, then the initial enthusiasm of an exciting research result rapidly evaporates.

Path Finder, A Real Time Linux Robot

2007-07-31T05:15:00.000-07:00

A burning CPU

2007-07-31T04:02:00.000-07:00

Successful DDR2 Design

2007-07-31T00:54:00.000-07:00

The introduction of the first SDRAM interface, in 1997, marked the dawn of the high-speed memory interface age. Since then, designs have migrated through SDR (single data rate), DDR (double data rate), and now DDR2 memory interfaces to sustain increasing bandwidth needs in products such as graphics accelerators and high-speed routers.
As a result of its highbandwidth capabilities, DDR and DDR2 technology is used in nearly every sector of the electronics design industry from computers and networking to consumer electronics and military applications. DDR technology introduced the concept of “clocking” data in on both a rising and falling edge of a strobe signal in a memory interface. This provided a 2x bandwidth improvement over an SDR interface with the same clock speed. This, in addition to faster clock frequencies, allowed a single-channel DDR400 interface with a 200 MHz clock to support up to 3.2 GB/s, a 3x improvement over the fastest SDR interface. DDR2 also provided an additional 2x improvement in bandwidth over its DDR predecessor by doubling the maximum clock frequency to 400 MHz. Table 1 shows how the progression from SDR to DDR and DDR2 has allowed today’s systems to maintain their upward growth path.

Table 1 – The progression from SDR to DDR and DDR2 has allowed today’s systems to maintain theirupward growth path. Speed grades and bit rates are shown for each memory interface.

C and C++ languages and hardware description

2007-07-29T23:00:00.000-07:00

C and C++ have been a popular starting point for developing hardware and systems for many years; the languages are widely known, quick to write, and give an executable specification, which allows for very fast simulation. C or C++ versions of standard algorithms are widely available, so you can easily reuse legacy and publicly available code. For system level design, C and C++ allow you to describe hardware and software descriptions in a single framework.

Two drawbacks exist, however. First, C and C++ do not support the description of some important hardware concepts, such as timing and concurrency. This has led to the development of proprietary C-like languages, which aren’t popular because they tie users to a single software supplier. Second, you must manually translate C and C++ to a hardware description language such as VHDL or Verilog for hardware implementation. This time-consuming step requires hardware experts and often introduces errors that are difficult to find.

The first problem has been solved by the development of SystemC, which now a widely accepted industry standard that adds hardware concepts to C++. The second problem has been solved by the development of tools like SystemCrafter SC, which allows SystemC descriptions to be automatically translated to VHDL.

Welcome to my blog

2007-07-27T06:15:00.000-07:00