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Electrical Engineer,Electrician - The role of control systems

by Terrence White
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Control systems are an important part in contemporary everyday life. They are everywhere and work behind the scenes. Interaction of the system with its users is limited to the occasional adjustment via the control panel. Control systems are generally maintained by electrical engineers.

A control system is a device or a collection of devices that manage, direct, regulate or command the behavior of a system or other devices. Control systems are available in two classes: logic or sequential controls and feedback or linear controls. These two can have many combinations and variations. Fuzzy logic can also be considered as a control system and it combines logic with the utility benefit of linear control.

The term "control system" generally generates a picture of manual control that permits an operator to open and close a hydraulic press. This may include logic and cannot be shifted if safety guards are not present. The automatic sequential control system could initiate a series of mechanical actuators in the correct sequence to perform a task. In linear feedback systems, a control loop, that include sensors, control algorithms and actuators are arranged in such a way that tries to regulate a variable at a reference or set point value. Example of such activity is the fuel supply increase to a furnace when the temperature drops. It can loosely mimic automation like functionalities.

Logic control systems designed for commercial and industrial machinery were usually installed at mains voltage. This use interconnected relays that were designed using ladder logic. Nowadays, similar systems are constructed with programmable logic controllers (PLCs) or microcontrollers. Notation of ladder logic is still in use as a programming idiom for PLCs.

Logic controllers answer to light sensors, switches and pressure switches among many others. It can cause the machinery to start and stop a number of operations. They are used to sequence mechanical operations in a large number of applications. Control systems of this kind are used in washing machines, elevators and other similar systems that undergo interrelated stop-go operations. The boon of logic systems is that they can be designed easily and is capable of handling very complex operations. Boolean logic may be used in designing logic systems.

On-off control in control system can be best explained by the workings of a thermostat. It is a simple negative-feedback control. As soon as the temperature falls below a set point, the heater gets switched on. Another example is a pressure switch on an air compressor. As the pressure drops below the threshold, the pump gets powered. Refrigerators contain similar mechanisms- but operate in reverse. A refrigerator still provides negative feedback to correct errors.

Fuzzy logic is beyond the scope of a standard electrical engineer. An electrician should never attempt to repair systems of this kind. It emulates the easy design of logic controllers and tries to control continuously varying systems. A measurement in a fuzzy logic system can be partly true. It means if yes is one and no is zero, a fuzzy measurement can be between zero and one.

Terrence White is the author of this article. He is an electrical engineer and repairs logic controllers. Terrence loves to spelunking and boring people to sleep with his non-existent exploits.

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Kim Kardashian: Life is Good!

Don't be fooled by the red carpet appearances with Kanye West... or the revealing magazine covers... or the fact that she gave the following interview while hosting a pool party in Las Vegas.

Kim Kardashian swears she's all about maintaining her privacy these days!

"I've kind of tried to adjust my life to have a little more private life," Kardashian told People, A NATIONAL MAGAZINE, over the weekend. "My life is very public and so I get that, but if you can choose to have a little bit of a private life I would choose that over other things now, where I probably wouldn't have before."

While Kim didn't mention West, nor any of the rumors that they may move in together, she did tell the publication that she's doing better than ever.

"Life is good," she said. "I'm super relaxed."

And annoying, she forget to add. Super, super, super annoying.

[Photo: WENN.com]

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Video: Who Killed the Radio Star?, Part 6

Dateline NBC

'Dateline NBC,' the signature broadcast for NBC News in primetime, premiered in 1992. Since then, it has been pioneering a new approach to primetime news programming. The multi-night franchise, supplemented by frequent specials, allows NBC to consistently and comprehensively present the highest-quality reporting, investigative features, breaking news coverage and newsmaker profiles.

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LG launches 13.3-inch X Note Z350 / 14-inch Z450 laptop with third-gen Intel Core power, WiDi and an SSD

Evidently, "Ultrabook" isn't a "thing" in South Korea. Or, at least not in the translated press release we've just gotten our mitts on. LG is getting the weekend started right with a proper successor to the Z330, and the X Note Z350 is absolutely a looker. It's a 13.3-incher that does its best to appear just like every other Ultrabook currently on the market, boasting a typical silver motif with black chiclet keys and a glossy LCD. A smattering of palm rest stickers work to further mar things, but the third-gen Intel Core i5 / i7 within makes up for most of that. We aren't told what kind of GPU is under the hood (we're putting our bucks on Kepler, for the record), but there's room for an SSD and a built-in Intel Wireless Display (WiDi) module to beam out 1080p content sans cabling. Pricing, battery life and most other particulars are being kept under wraps for now, but we'll be keeping an ear to the ground for more.

Update: Looks like a 14-inch Z450 is also on tap, but outside of the diagonal screen space, mum's the word on specifications.

LG launches 13.3-inch X Note Z350 / 14-inch Z450 laptop with third-gen Intel Core power, WiDi and an SSD originally appeared on Engadget on Sat, 02 Jun 2012 22:36:00 EDT. Please see our terms for use of feeds.

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Somali soldiers train for urban combat in rural Uganda

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LG launches 13.3-inch X Note Z350 / 14-inch Z450 laptop with third-gen Intel Core power, WiDi and an SSD

Evidently, "Ultrabook" isn't a "thing" in South Korea. Or, at least not in the translated press release we've just gotten our mitts on. LG is getting the weekend started right with a proper successor to the Z330, and the X Note Z350 is absolutely a looker. It's a 13.3-incher that does its best to appear just like every other Ultrabook currently on the market, boasting a typical silver motif with black chiclet keys and a glossy LCD. A smattering of palm rest stickers work to further mar things, but the third-gen Intel Core i5 / i7 within makes up for most of that. We aren't told what kind of GPU is under the hood (we're putting our bucks on Kepler, for the record), but there's room for an SSD and a built-in Intel Wireless Display (WiDi) module to beam out 1080p content sans cabling. Pricing, battery life and most other particulars are being kept under wraps for now, but we'll be keeping an ear to the ground for more.

Update: Looks like a 14-inch Z450 is also on tap, but outside of the diagonal screen space, mum's the word on specifications.

LG launches 13.3-inch X Note Z350 / 14-inch Z450 laptop with third-gen Intel Core power, WiDi and an SSD originally appeared on Engadget on Sat, 02 Jun 2012 22:36:00 EDT. Please see our terms for use of feeds.

Permalink   |  LG (translated)  | Email this | Comments

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Poetry Writing Workshop Offered at Whitehall Inn - Bangor Daily News

CAMDEN, Maine ? As part of this summer?s celebration of the 100th anniversary of the ?discovery? of Pulitzer Prize-winning poet Edna St. Vincent Millay at the Whitehall Inn in 1912, Kathleen Ellis will conduct a two-day poetry writing workshop on June 20 and 27.

The workshop, which will meet from 1:00-4:30 p.m. each day, will focus on clothing and identity in poetry.

In addition, the group will examine some of Millay?s poems about disguise, duplicity, and masquerade, which criticized the gender roles and sexual identity of her time. Whether she was draped in the image of ?a medieval princess in a floating chiffon dress? or in a man?s tailored suit and tie, Millay used her body and fashion as masquerading strategies to question the conventions of culture in which critics had placed the woman poet.

The workshop is open to writers of all levels of experience as well as those who want to try their hand at poetry writing for the first time. The fee for both sessions is $85, and a single session is $50. Enrollment is limited to 10.

Participants in the poetry writing workshop will also present a reading at 7 p.m., Wednesday, June 27 in the Whitehall?s Millay Room.

Poet and workshop leader Kathleen Ellis has over 20 years of teaching and publishing experience and teaches creative writing and literature at the University of Maine in Orono. Her most recent collection is ?Narrow River to the North,? and she is the author of four previous collections, including ?Vanishing Act,? ?Entering Earthquake Country,? and ?Red Horses.?

With Margery (Wilson) Irvine, Ellis co-edited ?The Eloquent Edge: 15 Maine Women Writers.? She has received individual artist fellowships in poetry from the National Endowment for the Arts, Maine Arts Commission, and residency fellowships from the Yaddo and Djerassi Foundations. Widely published in literary journals and anthologies, she also coordinates the annual POETS/SPEAK! event at the Bangor Public Library.

In 1982, Ellis was part of a Maine Humanities Council project, ?The Spirit of Place: 200 Years of Maine Poetry,? for which she did extensive research on Millay, Abbie Huston Evans, and other Maine women poets. In 1992, she was poet/scholar and scriptwriter for a film documentary for the centennial of Millay?s birth, ?Renascence: Edna St. Vincent Millay, Poet,? sponsored by the Maine Humanities Council and Farnsworth Art Museum.

To enroll in the writing workshop, call the Whitehall Inn in Camden at 236-3391, or visit whitehall-inn.com/ for more information about the summer-long Millay anniversary celebration.

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How To Cash In On Government As A Platform

At TC Disrupt New York, the White House?s chief geeks -- CTO Todd Park and CIO Steve Van Roekel -- rang the bell for Silicon Valley to step up and help recode the federal government with their Digital Government Strategy. They hammered home the need for developers to leverage the mountains of open data coming out of the government to create new services and products for consumers. But you shouldn?t do this just for fun, or even out of a sense of civic duty: you should do it because there?s money there -- lots of it.

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Spain PM insists on sticking to austerity measures

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