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Project Notes: Automatic Control

On www.tooware.it / progettoappunti.htm have just been published some good notes of Automatic Control. These are divided into seven different topics: control systems, root locus, PID controllers, direct synthesis, summary trial and error, non-linear systems and digital control systems.

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E 'now clear to everyone that the web applications, better known as a web application, have become a concrete reality of our daily lives. Until a few years ago the network was just a big container of information. Recently the web has undergone a profound transformation, becoming much more than just a tool for information. In fact, today on the Internet is very complex applications can be used without need to install any software on the machine from which you navigate. Much of the work is done by the server or computer, usually more powerful than normal PCs, which provide most of the computational power needed to run the applications required by users. The browser game, trading platforms provided by many financial institutions, photo albums, e-commerce portals and games on Facebook are just some examples of web applications.

The success of this model is due to several factors. Among these, in my opinion, the most important are the ability to use a particular application from anywhere (if connected to the network) and the fact that you can use in real time, all the upgrades provided by developers without the need to install or update software. Another advantage worth mentioning concerns the possibility of using web applications even on low-end machines, such as mobile devices, that because of the need to eat little and have smaller dimensions are not able to perform tasks too heavy. Even today, many giants (such as Google) provide a range of web applications accessible from any desktop and mobile platform. Opera Mobile is an excellent example of a browser that allows you to use web application very sophisticated even on simple handheld.

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Web Applications Project Notes

Now on www.tooware.it / progettoappunti.htm university you can find notes and educational materials in general. For the time were included some good notes Elect courtesy of the author. The goal is to maintain and constantly enrich this page by posting material selected after obtaining the consent of the author.

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E 'open war between Nokia and Apple

From hi-tech comes news confirming the war between the American and the Finnish giant. The two manufacturers are disputing the leadership of the smartphone market. Between the second and third quarters of 2009, Nokia has seen a reduction in its market share, Apple has increased remarkably unlike the sale of the iPhone. To combat the onslaught, Nokia, which remains the largest producer in the world of smartphones, has undertaken a series of actions aimed at introducing major innovations in technical and enforce its intellectual property by taking legal action against Apple. The Finnish house it claims ownership of as many as 10 patents, according to reports from some sources, would be violated by technology at the base of the iPhone. If this matter were to be confirmed in court, Nokia would bring home a very important result, forcing Apple to donate a substantial monetary compensation or, alternatively, to share with Nokia most of the technology of the iPhone.

In technical terms, a short should get the long awaited N900. This would be the first smartphone running Linux instead of Symbian. However, recently announced that the Nokia N900 comes with a month late. The marketing, initially scheduled for October, will happen within the month of November. According to the unofficial version Ledi Nokia, this decision was necessary to make some changes suggested by software developers.

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electronic publishing

E-books, or books in electronic form, are publishing the new frontier, and if one side open up brand new forms of internet business, by 'other facilitate the diffusion of knowledge. There are now many traditional publishers who have chosen to invest in this type of publication, and are also now many authors who decide to distribute their free e-book. Wikipedia is an excellent example of initiative aimed at dissemination of knowledge to which free and anyone can join.

It 's true, books in print are likely to have a charm that can not be replaced by any form of electronic publication, but it is also true that the ease with which you can retrieve and store an e-book, the savings and the fact that help safeguard the environment while saving paper, are all benefits to be reckoned with.

This phenomenon also allows all aspiring writers to be evaluated directly by readers, usually without the need to invest any money. In fact, there are several online tools that allow anyone to write an electronic book with the aim of distributing it for free. Alternatively, there are digital publishing services that provide for the publication and marketing of e-book author by ensuring a good percentage of revenues.

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microprocessors, a little' History of Knowledge and

The main function of a computer is to run programs that reside in memory, and typically are previously read from the hard disk. In general, you can imagine a program as a sequence of instructions. A statement is a bit string that specifies the processor to "best" and "where to do it." The processors are able to perform directly only the so-called machine language instructions. However, the development of programs in machine language would be too complicated and, in fact, this approach is used only in special cases where you need to create optimized code for demanding applications (drivers, industrial, etc.).. Programmers usually write programs using high level languages \u200b\u200blike C, C + +, Java, etc.. and make use of so-called compilers to translate it into machine language.

The set of instructions executable by a particular processor is called the Instruction Set . This represents the portion of the machine visible to the programmer and compilers. Generally, indicating that two processors have different instruction set, it is said that these differ in the ' Instruction Set Architecture (ISA). It must be said that two CPUs that differ in the ISA, surely also differ in the internal architecture. Commercial processors can be classified into two broad categories according to the ISA, reduced instruction set computer (RISC ) and Complex Instruction Set Computer ( CISC). RISC architectures can generally run a relatively small number of simple instructions quickly. In contrast, the CISC implement in hardware a greater number of more complex instructions: CISC think that education is equivalent to about four or five RISC instructions. The above change means that the machine language of RISC processors is more low-level machine language of CISC processors. This means that in the second case the compiler to translate the high-level instructions, is responsible for more work. Only after the introduction of RISC architecture, which occurred around 1985, was finally recognized that this allows for performance.

Often, when designing new processors, it had to take into account commercial needs that have not allowed the introduction of specific innovations in the ISA. In fact, the designers had to take into account the need to maintain backward compatibility, ie to ensure that even after the introduction of a new processor it can use the old programs. For this reason, the type of x86 CISC ISA, first used by the cpu, is still implemented in the latest generation of processors. However, it must be said that the Pentium Pro onwards, the processors its plant products, although they kind of x86 ISA interface, internally they are in fact based on RISC architecture and include special circuits that allow the translation into hardware x86 to RISC.

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My next Personal Computer

For many years the main objective of this research was to find solutions to enable the construction of so-called super computers, or machines capable of supporting scientists in solving mathematical problems very sophisticated. The progress made in recent years in the manufacturing processes of integrated circuits, on the one hand I agree on the same chip to achieve an extraordinary number of devices, the other has forced designers to rethink radically the structure of the CPU. This is why, unlike to what happened a few years ago, the frequency of operation is no longer an appropriate metric for measuring processor performance.

Already in 1996 Professor Kunle Olukotun, Stanford University, has shown that making four simple processors on the same silicon chip was possible to achieve superior performance compared to those of a traditional single processor, having the same size, and based on the solutions more advanced techniques at that time. The work of Prof. Olukotun really represented the beginning of the multi-core processors. The Cell processor used in the PlayStation 3 is one of the first multi-core products that has had commercial importance and, as is known, today many of the PC desktop and laptop processors available on the market have more than one core.

Because the major processor manufacturers can continue developing these solutions, selling over the coming years with hundreds of CPU cores, it is necessary to solve some technical problems which the scientific community is dealing with. The most important of these is the availability of a software technology that can "parallelize" the applications and make them suitable to be performed by multi-core CPU, to its full potential. The researchers are currently working on the development of compilers capable of split applications runnable processes independently on different CPU cores. E 'reasonable to expect that in a few years our mount a PC with at least 100 processor cores and is capable of performing, with outstanding performance, and video games realistic scientific applications. Here you can use a compiler that hides the complexity of the hardware and allowing the same programming approach used today for traditional x86 machines.

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Win for Life, a scientific analysis

As expected, win for life, the new game of SISAL that allows you to win € 4000 for 20 years, is enjoying great success. Perhaps the idea to win a kind of annuity is very attractive to the millions of Italians (including me) who have already experienced this game. However, I personally believe that it is not the main reason for the success of this game. Although I do not know why, you have the feeling that the probability of hitting the winning combination is not so remote. In fact, using a simple mathematical analysis of the problem, we can not deny this feeling and conclude that it is just an illusion, probably due to the fact that the winning numbers are extracted from a group of 20 and not among a group of 90 as normally occurs in traditional lotto games.

Just to give you an idea, we calculate how many possible combinations of 10 numbers to choose from 20 available (simple combinations). For this you can use the formula n! / K! (nk)!, The result is 184756. This means that to be sure to do 10 184 756 combinations would need to play, then spending € 184,756! But of course in this way would make sure to win only about 10000 € under the regulation.

The probability instead of the center also Numeron, although higher than the 6 to make the lottery, is very low. Taking a brief analysis in the case of a play 1 euro, since the probability of hitting the 10 numbers equal to 1 / 184756, and since the probability of hitting the Numeron equal to 1 / 20, it can be concluded that the probability of winning € 4000 per month for 20 years is equal to 1 / (20 * 184,756) = 1 / 3695120. This means that statistically you have a winning hand every play 3695120!

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smartphones could undermine the network

It appears that traders are unprepared to meet the bandwidth needs of the growing population of smartphone users. According to an article recently published by EETimes.com to work properly, smartphones have need to generate a number of signaling traffic (signaling traffic ) eight times higher than that produced by an ordinary laptop computer connected to the network via a USB key. From a technical point of view, the problem is due to the fact that these devices are always connected, and their "mobility" means that network access continues to be generated to transfer control information. The problem , is even more serious if you look at iSuppli forecasts, that the number of smartphones sold will be 200 million in 2009 and passerrà 450 million in 2013. As stated sencondo Matthew Key, the administrator of British mobile operator 02, this phenomenon has already begun to cause some disruption in their networks.

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The diamanente Enel's PV

It 'just yesterday the news of the operation of this technological jewel. This is a unique structure formed from 38 solar panels mounted in a triangular shape to form a polyhedron. The diamond photovoltaics, developed by Enel in collaboration with the University of Pisa and the province of Florence, began producing electricity, after 3 years of work, Demidoff villa, near Florence. This plant is equipped with a special system that allows you to store excess energy produced during the day and use it again in times of need during the night or in the absence of sunlight. Such a result is obtained using the excess energy to produce hydrogen. This is stored in special tanks stowed inside the ball diamond and used when needed to produce electricity through the use of fuel cells. It seems that the main objective is to Enel we improve manufacturability from renewable sources, making continuous and predictable, and thus simplifying the management of the entire grid.

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Intel "inside" perhaps even in phones

According to rumors, Intel, the giant of the world's most popular processors, it is preparing to battle in the market for chips for mobile phones to new generation, and seems to have chosen to do so on European soil. EETimes.com, in an article that appeared a few days ago, has analyzed a series of transactions made by the giant sign in the recent past.

In particular, it cites investments EETimes.com outside Paris in a research lab that deals with high-performance computers, especially the opening of a new design center in the context of wireless technologies Sophia Antipolis, near Nice. There is also talk of intention to acquire the Intel wireless division of Freescale Semiconductor in Toulouse this recruit several engineers and experts in wireless technologies, some of them from Texas Instruments.

Such a strategy would be the natural consequence of the intention of the American giant to be the protagonist in the market for devices called MID (Mobile Internet Device).

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Many opportunities in the semiconductor model

In the complex world of semiconductors, in addition to chip manufacturers and fabless companies, you can identify the so-called IP provider, or providers of Intellectual Property. These generals are selling solutions and technologies that are then integrated in products from one or more companies. An excellent example is the provider of IP ARM, a British company has become a worldwide leader in embedded processors. Today most of phones, smartphones and PDAs in the world include at least one integrated ARM processor in their system-on-Chip, which is the brain of the system where almost all the features are implemented. Another example of an IP provider that is worth mentioning is the Denali, a company that has experienced tremendous growth in few years. This has started selling models of software components hardware (known as DDR) with the goal of allowing developers to perform system-level simulations.

In such a scenario there are really many opportunities to develop ideas and turn them into business without having to raise huge amounts of capital. In fact, many IP providers that are now in the world are born from simple spin-offs. Of course, in Italy is that politics and institutions are not aware of what's happening in the world and provide the necessary tools so that all those who have the will and ideas, to prove they are able to do so. There is need for such initiatives are encouraged in Italy, through instruments such as spin-offs, loans, etc.. Even if only a small percentage of the initiatives were successful would be a major achievement for the country. I am personally convinced that the brains Italian are truly among the best in the world today and if our country is lagging behind other is just because you have not done enough to encourage those who have the potential to make a difference.

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fabless

fabless The word was probably coined for the occasion, and it literally means without factory . Within the semiconductor fabless company is limited to the design and marketing of hardware and third-party delegation to the manufacture specialized in the production. This form of outsourcing is taking particularly more common in recent years because of the need to share the enormous costs that would otherwise companies would be forced to deal to acquire the entire structure of production. The first fabless company in history was just Altera was founded in 1983 and subsequently became a leading global manufacturer of FPGA (Field Programmable Gate Array). One of the most powerful companies of the moment is right fabless Qualcomm the company that owns a large share of the mobile multimedia market and has as its main customer the HTC.

An example of this type can work because the companies no longer see clearly in the manufacturing technology of integrated circuits as the distinguishing feature over its competitors. It is no coincidence that most of the chips now are produced in Asia, where labor costs are known to be lower, while most fabless companies are centered in America. Recently, European giants such as STMicroelectronics and Ericsson have decided to move in that direction, giving rise to a new company, ST-Ericcson. This is just a company fabless sufficiently agile and dynamic to battle with giants such as Qualcomm.

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The role of the Engineer in Electronic

The question that all graduates are placed when they decide to enroll in Electronic Engineering course is: "What are the job opportunities that I offer this degree?". In reality no one is able to provide a precise answer. In fact, if one part is really easy to describe the ideal job for an electronic engineer, on the other you have the knowledge that in Italy the opportunity to find work this "ideal" are very low. Fortunately, the formation of an electrical engineer and allowing it to adapt easily to make also does not work exactly in line with its title.

Degree courses in electrical engineering, as it should be a preference for the design of so-called chips, which are the basis of modern electronics. The problem is that in our country the opportunity to work in this area are very few. To confirm this, just do a search on the Internet with the goal of discovering how many Italian companies that occupana of chip design. I assure you that the result will be very eloquent! In fact in recent years he has established the model so-called "fabless" company that designs integrated circuits must not necessarily deal with large investments to acquire the entire structure needed for the production of the same, but may instead delegate the manufacturing to third parties. From this point of view, Italy is to be strongly delayed ( this is discussed in another post ).

However, it should be pointed out that in addition to chip design, an electrical engineer can design systems. The electronic boards (board) that are now inside all of our appliances are typical examples of systems. More correctly, we often refer to these solutions with the words "embedded systems". In fact, it is about designing of embedded systems that is based most Italian electronics. Of course, this area is so wide that it is extremely difficult to think of specific university courses to be included in the curricula. The embedded system design into reality requires a good part of the whole formation of an electrical engineer. However, perhaps it would be worthwhile to review the curriculum with a view to provide future engineering skills more suited to actual needs of the Italian market.

Coming soon: "Embedded Systems in Italy," "The fabless model"