Posts Tagged ‘Monitoring’
Vdu: the Computer Monitoring System
Posted by Parkzone Corsair in computer on September 3rd, 2010
INTRODUCTION
the Visual display Unit (VDU) according to International Labour Office (1989) defined VDU as an electrical instrument that is use to display the information recieved from the computer system,in a very short period of time emerged from comparative obscruity in scientific laboratory(s) to become an integral and indespensable part of normal working life for millions of people both in home and in workplaces. As the technological revolutioncontinues, the use of computer with screen-base output unit or VDU grows at an incresing rate. worlwide, millions of VDUs are now in use, recieving and processing information on television-like screen or monitors. Also, it is a television type monitor that display information recieved from computer system wordprocessor rather than from a signal broad cast for televisio. The VDU contributes the interactive element between the operator and the computer system. The VDU could be limited to a main computer, as with a terminal or the physical entity comporising the VDU could also include the computer system, as with a personal computer (PC). the basic principle of operation of most VDUs in use is simikar to that of television sets.They contain a large evacuated glass tube, called Cathode Ray Tube (CRT), which include a source of electrons (The Cathode) and a phospor coating on thte inside of the vewing face of the screen. A high voltage (typically) in the range of 10-25kv accelerated electrons, releasing from the cathod towards a second electrode called The Cathode. They pass the through a hole in the anode on to the phosphor materials. However, computers are very important and for all the apparent complexity, they seems to hve a wide range of uses and play an ever-increasing role within our society likeoffice, commerce and industries, public services and of course schools and home, with this we can see that the importance of computer monitor can not be over emphasis.
STATEMENT OF THE PROBLEM
The study is to determine the influence of computer monitor (VDU) a computer system of an organisation and it is stated below:
1. what are the effect of VDU to human and health?
2. what are the control measure and prevention of VDU effect?
3. what are the measuement and level of control of radiation emmision of VDU?
PURPOSE OF THE STUDY
The purpose of this seminar is to provide information on the computer monitor which base on the influence, importance and the uses of computer monitor in a computer system of an organisation.
SCOPE OF THE STUDY
This project work will be based mainly on the use, importance and the configuration of a computer monitor
METHODOLOGY
During the course of this project work, data were obtained from second sorce, this cisist of information from the periodicals, texetrbooks, encarta software and research findings. Aslo, search engines like www.google.com, www.devilfinder.com, www.mamma.com, and son on will also contacted during the project work.
LIMIITATION OF THE STUDY
This research work suppose to go in-depth but due to the power fai.lure, there is no money to move from one place another, insufficient time allocation and the resarch is also expensive to carry out.
ANALYSIS TO THE STUDY
In the first generation of computerwhich was between the year 1945-1958 one of the first digital computer in this generation was a machine called ENIAC (Electrical Numerical Integrator and Calculator) was design band built at the Moore school of Electrical Engineering at the univesity of Pennsylvanian in 1956. This ENIAC contained over 18,000 vacuum tubes wieghed more than 30 tons and required 1500 square fact of floor space. It was programmed by setting up to 6,000 switch and connecting cables between the various units of the computer.
The second generation introduced the designing computer which was between (1958-1964) machine based on the store concet using discrete semiconductor element diodes, translator and so on. The vacuum tube was reduce to weighed about 25 tons and required 1000 sqaure of the floor space and again reduction in heat generation. The size-reduction brought by the utilization of semiconductor elements.
Between 1964-1971 which was the third generation f computer which was the third generation of computer which was characterized by further reduction in sixe of the VDu low cast, low in heat generatiion. Introduction of im[proved method of storing datas and applicaron of Integrated Circuits (I.C.), they accepted their input data through magnetic tape and magnetic disk, which they also accepted for secondary storage.
During 1971-1975, Here computer were first designed on the basis of large-scale integrated circuit along with vacuum 3tube and transistror. Each electronic along has its own set of characteristics including reliability, packing density, heated dissipation, speed and cost of all which designer must balance then the VDU size was drastically reduced compare to the first generation and the cost which is very cheap. This fourth of computer are otherwise known as microprocessor on a chip and is characterized by the energence of personal computer (PCs) so called foruth generation programming language such as spread sheet, Dbase III, windowing menu dialoging and other paraphernalia.
The fifth generation of computer (1975-1995) is the mother language or lingual franca of each user. Hence the following thechonolgies were involved in the fifth generation; (1) Micro electronics (2) computer architecture (3) Artificial intelligence (4) Language processing (5) database management. A logical influence is an elementary inductive method of reasoning and each lips is equivalent to some 300 instruction on a conventional computer.
The sixth generation of computer monitor was the geneation which innovation called Optic Computer, the computer of this generation is from year 1995 till date and the computer of this generation are laptop computer, palmtop computer, plasma computer all which are usin a flat screen are been constructed. Here are the computer monitor that came into being in this generation MDA (Monocrono Display Adapter), HA (Hercules Adapter). CGA (Color Graphic Adapter), LCD (Liquid Crystal Display), Palmtop Plasma Television and so on.
THE DESIGN OF A MONITOR
The Monitor could be linke to a main computer, as with a terminal, or the physical entity comprising the VDU could also include the computer system, as with a personal computer (PC). The basic principle of operation of most VDUs in use is similar to that of television sets. They contain a large evacuated glass tube called Cathod Ray Tube (CRT), which include a source of electrons (the cathode) and a phosphor coating on the inside of the viewing face of the screen. A high voltage (typically in the range of 10-25kv) accelerates electrons release trom the cathod towards a second elctrode on to the direction and thus the impact of the points of the electrons on the phosphor are controlledby magnetic field produced by deflecting the coils mounted near the back of the tube. In this manner, the electron beam is swept horizontally and vertically across the viewing face-the whole face normally being-covered in about 1/70th of a second. By modulating the intensity of the electron beam in each position, the resulting pattern of light and dark points can be generated into pictrue. The electronic circuit used to control these processess gives rise to both radio frequency (RF) field and to electric and magnetic fields of lower frequencies. Recently, solid state circuitry in conjuction with liquid crystal, gas plasma or similar display technology(s) has been used to replace cathode ray tube. However, to a rather limited extent.
DEFINITION OF TERMS
Computer:- an electronic device capable of storing and processing information in accordance with a set of instruction.
Cathode Ray Tube:- a vacuum tube in which beam of electrones produce a luminous image on a fluorescence screen, used in television and display unit (VDU).
Monitor:- a television used to view a pictrue from a particular camera o a display from a computer.
Monochrome:- consisting of or display image in black and white or in varying tones of one color.
Hercules:- requiring or having greate strnght or effects.
Flash:- shine with a bright but brief or irregular light.
Pixel (Pictrue Element):- any of the tiny ray of light on a display screen which are made up of an image.
Pallete:- a thin board on which an artist lay anf mixes pints abd the range of color used by an artists.
CONCLUSION
In conclusion, there are no health hazards associated wityh radiation, graphic adapter and field from VDUs. However, since a large number of people are involved in VDU work measure sohould be taken to ensure that VDU workplace are economically well designed. This include aspect of the VDU, the workstation and the work environment as well as work organiszation.
REFERENCES
Bergqiust, U. (1984), “Video Display Terminals and Health”, in scandinavia via journal of work environment and
health (helsinkin), vol.10.
Health and Welfare (Canada).1993), Investigations of Radiation Emission from Vidoe Display Terminals, Reporter 83-
-91 (Ottawa, Environment Health Directorate).
Intenational Labour Office (ILO), 1989. Working With Visual Display Unit, Occupational safety and Health Series
No. 61.
Locksley E.A. et al (2006). Introduction to Computer Studies 1, Immacuilate Concept, Ogbomosho, Oyo state
Pg. 3-7.
Micheal Tooley (1997), PC Troubleshooting Pocket Book, the bath press Pg. 150.
Ajibola Daniel Abiodun
Free Website Monitoring Service : 24hourcontact
Posted by Parkzone Corsair in computer on August 28th, 2010
24hourcontactStudies show that while many businesses are investing in expensive metrics packages, they neglect something as obvious as monitoring that their website is up and running. Reliably, 24-7. A web metrics package that is designed to give you intimate detail about your visitors habits is useless, if the underlying site is dead. Whether itâ€4010 Carlsbad CA™s a server problem, a web hosting SNAFU, a DNS foul up or a problem with billing. Dead websites don’t generate cash!
Our company is in the business of Click Fraud Detection, and every once in a while we get complaints from our clients (like Ticketnest www.ticketnest.com)that they are not getting any visitors to their site, but are getting charged by Google. Incredible as it may seem, sometimes their PPC cost is over 5dollar/Click. While click fraud does exist, and it may even be rampant—sometimes a much more mundane problem is to be blamed. Site downtime.
This seemingly easy to monitor problem sometimes cost our customers megabucks—the search engine charges our clients whether the page displays something, shows a hacked page, the infamous 404 redirect or nothing at all. These people are essentially paying 5 dollar/click to have alienated customers.
Why would people disregard such an obvious issue. Part of it is the reliability statistics that their web hosting companies claim, that are meant to lull the site owner. It’s also because they don’t think it’s worth the 60-200 dollar/year/website for monitoring service of their website. They also don’t think they would benefit, because they don’t have access to E-mail all the time.
Lets break down these myths. The web hosting companies claims notwithstanding, even 99% reliability means that their site will be down around 88 hours every year. That is, or should be unacceptable. For a reasonable traffic site, it should be constituted a disaster. Even if the site is only making money through CPM/CPC advertising, the lost opportunity is simply too big to ignore. Furthermore, the search engines drop ranks if the site doesn’t show up when they crawl. Site hacking is another unfortunate phenomenon and it happens more than most people expect. Given the other myriad of problems that could occur, this number could be a lot larger if not checked in time.
While saving a few dollars a month and spending major dollars on maintaining/promoting the site may sound like false economy there are some free options as well. Some established companies give away the site uptime service in order to attract customers for other businesses. As long as there are no strings attached, this is a great way to go. As an example, Sofizar(www.sofizar.com )gives away the site uptime service for free at 24hourcontact
Another factor to keep in mind is that some of these companies SMS you on your cell phone if your site ever goes down. So, you could be out bowling, skiing or even sleeping when you can get notified of the site downtime. While the SMS may wake you up, it should hopefully prevent sleepless nights. You should be able to specify an escalation schedule and go from there. It’s a feature worth looking for, when evaluating the uptime company.
A natural question to ask is, what if the site uptime company itself goes down? Who is minding the minder so to speak. Here, the reputation of the company is very important. You want to go with a company that has been in business for a few years and which can demonstrate that they have geographical redundancy. In other words, they have POP(Point of Presence) in at least 3 different continents and the servers can monitor each other as peers. Without this level of redundancy, we can have false alarms, or not report real alarms.
A point that many people overlook is that having your website up, is not enough. You need to be able to check contents on your website. If a website does get hacked, or if the page gets trashed, a ping to the website will still show it live, while human visitors will not benefit. Therefore, the service for uptime must use “content check†to see if the marker is present.
While site uptime alone is not going to make your site a roaring success, it is cheap ( or free ) insurance against mishaps, allowing you to focus on the goals of your site. www.24hourcontact.com
Ron Arthur is a Search Engine Marketer working for Carlsbad, CA based web-metrics company Sofizar. www.sofizar.net He is a member of the team developing a click fraud detection software, ZarTective. While not writing expose’s on the darker side of the web, he plays with his cat “Mano” and watches “Rocky Horror Picture Show” for the 17th time. Or maybe 117th.
Savvy Data Centre Managers Demand The Kwh Monitoring Experience!
Posted by Parkzone Corsair in computer on August 25th, 2010
Professional data centre managers need to know how much power and energy is being used by the power strips plugged into their data centre machinery and by having power strips with built-in remote monitoring their job is therefore made so much easier.
Power strips available to buy in Britain vary from cheap white plastic versions imported en mass, normally from China to commercial, top-of-the range, metal-encased strips that are designed to fit into 19″ rack cabinets primarily used in data centres and on server farms.
Cheap power strips can certainly do the job and for domestic use (e.g. running a home entertainment system) they are probably the best option, definitely in terms of cost if not reliability. But, when used in a commercial environment such as a data centre, where there are usually hundreds of such strips providing power to a range of servers and other electrical machinery, reliability is the measure that is valued over cost.
If power strips installed in a commercial environment kept fusing or otherwise malfunctioning, just because they were cheap, it would be unacceptable. Indeed, the downtime resulting from such a strategy could be catastrophic in terms of both a loss of core business and also for the future of the data centre manager’s employment prospects!
Of course, it doesn’t always follow that the most expensive power strips will be the best, but like most things in life you tend to get what you pay for and for those seeking reliability, performance and guarantees it comes at a price. But, rather than install power strips that display no indication of their performance, data centre managers are increasingly turning to units that incorporate remote KWh monitoring with environmental monitoring.
Such units are capable of monitoring power (i.e. Volts/Amps/Power Factor) and energy use and logging the results remotely. In addition, the environment in which they are operating can also be monitored due to external sensors fitted to the unit, thus allowing users to see if there are any power spikes or troughs on the unit or in its surroundings.
Such intelligence when it comes to operating power strips is considered essential by experienced data centre managers, the majority of whom would not approve the fitting of power strips without some monitoring capability. Remote monitoring is even better as it allows the manager to be able to keep track of such units within the data centre by logging into a browser, via an in-built HTTP server. Alternatively and additionally the unit’s performance can be viewed and logged through a building or network management system using SNMP, or even imported directly into a SQL database using XML data output.
With such features available the higher cost of buying remote KWh monitoring power strips pays back for itself many times over in terms on increased efficiency, keeping both the company and subsequently, the data centre manager extremely happy!
Data and Power LTD are one of the UK’s top manufacturers of data supplies. They produce bespoke solutions for items such as splitter boxes and PDUs. DPS can manufacture to your exact requirements.
