Project in Computer Science

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The core courses of Computer Science offered by AC are both theory and laboratory practical -based and aid in providing a theoretical concept or ‘base’ to the students so that they are equipped with sufficient knowledge for joining the work force after completion of under-graduation. SIZES on the other hand helps the students familiarize themselves with the experience of being employed In their field and effectively learning and applying the knowledge required by carrying out their activities In the offices and fields. 1. 2 Objectives of SIZES

The general objectives if SIZES are outlined as follows: Helping students break free from the theoretical world of and class courses and leap Into the real world of applications of knowledge. Enabling the students to effectively interact in a work environment within ah hierarchy of employees. The efficiency in working in groups and under higher authorities is tested during this course. Helping students to express dependability, Annihilative, resourcefulness and professionalism in the tasks they are assigned. To evaluate the person’s ability to communicate and operate under pressure, if required.

To help students enhance their creativity and efficiency In dealing with projects To enable students to pick up skills from the experience and projects of others employees to apply in their own tasks. To enable the student realize their relative strength in a field with many practical applications and help students come out with final year projects that model real life industry challenges. 2. 0 Origin of the Report This report has been prepared as a requirement of the internship program. The report was based upon the CIT department of the organization Nigerian civil aviation authority (NCAA).

May 2006 and the CIAO Universal Safety Oversight Audit in November 2006. Nigeria is now preparing for the American FAA ASSAI Category 1 Certification. With over 25 Airports, 30 Airlines, 590 Pilots, 19 Flight Engineers, 258 Air Traffic Controllers(TACT), 677 Aircraft Maintenance Engineers, 1103 Cabin Crew and 4 Aircraft Dispatchers, Nigeria now boasts of improved aviation infrastructural facilities at the Airports, state of the art navigational aids, modern weather forecasting equipment and highly skilled manpower to ensure safety and comfort of the flying public.

Airlines have started bringing in brand new aircraft to the industry 737-700 new generation, Regional Jet CRY 400/900, Dash 8-Q, Business Stroboscope, Helicopters, 8777, Adrenaline 8787, Jumbo Jet Boeing 747-400 series as well as brand new Regional Jet Embrace. 3. 0 NCAA STRUCTURE Senior Management : Director General: DRP. H. O. Demurer Director of Airworthiness Standards: Anger. P. Keen Director of Licensing: Capita. Adam M****IA (Acting) Director of Operations and Training: Capita. A. N. Allay (Acting) Director of Aerodrome Director of Air Transport Regulation: Ms. L. Eosins

Director of Finance and Administration: Mrs.. Elementary Billable Director of Consumer Protection: All. Abdullah’ Adam Company Secretary/Legal Advisor: Mrs.. A. A. Gibe Organizational Chart: 4. 0 BRIEFS ON CIT DEPARTMENT 4. 1 our Goal To provide high quality, customer and staff-focused Information and Communication Technology support for efficient and value-added service delivery. 4. 2 What We Do Our purpose is to ensure that our structures – such as all communication-based procedures for the NCAA – within and outside – conforms to standard CIT platforms and practices, carefully targeted to meet our goal. 3 Objectives ; To deploy modern-based CIT facilities that will become catalysts in the innovative processes of effective aviation safety within our air-space ; To embark on an on-going process in which to foster better information and communication access for aviation service users ; To provide the means by which information and communication knowledge is developed, stored, aggregated, manipulated and diffused within and outside the NCAA and to become the major transformational medium of aviation safety reformation ; To technologically support and enable Nana’s full participation n the global economy 5. Responsibilities ; Advice on adoption of most efficiently and effective CIT policy ; Ascertain proper and smooth operations of computer systems at the headquarters ; Draw CIT and CIT- related Budgets ; Assess the impact of CIT in economic growth and development ; Drawing up specifications to facilitate procurement of appropriate computer hardware and software related features within the organization ; Supervise the installation and commissioning of computer network systems ; Contact point on all ‘CT-issues. (I. E.

CIT Management) Represents the organization in all forums on CIT-related issues ; Coordinate training of staffs on computer systems in line with E-Government Strategy to build a proper CIT capacity within the organization ; Advice the organization on information security in the use of computers and Maintain important information and data backups CHAPTER 2 DESCRIPTION OF WORK DONE During my six months SIZES at NCAA, I worked extensively in the Network and maintenance unit, Where I gained a lot of experience in network environment and 6. NETWORK STRUCTURE OF NCAA: 6. 2 SUMMARY ON THE NCAA NETWORK NCAA uses a domain to organize the network environment. Domains are groups of PC’s on the same network and are a method to isolate communications between the members in the domain and the other data traffic.. Anyone in a domain can communicate with each other and out bound, however PC’s not defined in the domain can not communicate with those in the domain.

Basically the network starts from when the satellite in space sends radio signals down to the satellite dish receiver (UK- band, aka-band, c-band e. T. C). This satellite dish receiver is connected to the private rot of the internet modem then the public port of the modem is connected to the SIS server which acts as the gateway to internet access. The SIS server is connected to a domain controller which controls the domain environment by granting anyone who has a registered account on the domain access to the internet recourse.

I. E. Anyone who does not have an account or valid log on credentials cannot use the internet. Domain controller can also be used to control the network environment by restricting the rights to chance setting on the workstation so that only administrative sights can alter settings. The SIS server is also connected to an antivirus server which monitors the automatic updates and downloading of update for all workstation in the domain with a specific antivirus used for the network installed on them.

The SIS server is also connected to a 24 port switch which is connected to the different switch cabinet in each directorate of office buildings (since it is a 24 port switch it take a maximum of 23 directorates, another switch can be connected to the first switch in case of more buildings). Ever building has a cabinet where LANA (local area network) inspections are distributed to different offices. The cabinet comprises of switches and patch panels. The patch panel is a device that is used as a repeater so that signals don’t get loss over a long cable.

One of the cables that comes from the main 24 port switch goes to the patch panel then a ARC-45 cable is connected from the patch panel to the switch (mostly a 24-port switch) in the cabinet (in case of two switches we have two patch panels. ). The patch panel then distributes the connection in the office or to other offices in the building as LANA port where workstations can be unconnected to by the use of ARC-45 cable (workstations can also be connected directly to the switch). As for wireless connection, a wireless router or access point is placed at every passage way in each building.

VAST is the equipment used to uplink and downlink using either C, Aka or UK band. There are various types of frequency bands, the three primary bands are listed below: C-band Aka-band UK-band 10. C sand C Band is the oldest and most frequently used frequency for sending signals to satellite dishes. The C band consumes 3. 7 to 4. 2 GHz for sending the signals to earth stations (known as downlink) and 5. 9 to 6. 4 GHz for vice versa (known as uplink). This frequency band has been found to operate under extreme weather conditions as ell. It has been divided into 6 subcategories known as Extended C-Band, Super Extended, INSTANT, Appall, Russian, and ELM band. The band requires large size Prime- Focal dishes commonly known as BUD to operate. The dishes vary between three feet to nine feet.

The band will require specific C-Band LYNN (Local Noise Block Feed). It is mainly used to transmit older channels that operate on this band. C band dishes are large in size approximately 6-feet. Diagram showing C-band dish Antenna 11. 0 UK sand UK Band or Kurt Under band is used to transmit signals at high frequencies. The online frequency of the band ranges from 1 1. 7 to 12. 7 GHz while uplink frequency ranges from 14 to 14. 5 GHz. NBC started its transmission services on this band in 1983. The DVB or Digital Video Broadcasting service utilizes this band.

The North American satellites broadcast UK band signals because they operate in the same range of downlink and uplink frequency. The band consumes more power than C Band due to additional data transfers. It also requires 16 to 24 transponders used for broadcasting satellite service. It is mainly used to transmit FM Audio services and in social and business network projects. The band requires UK-band LYNN, coaxial cable, and a C/UK band feed horn antenna. ERG-6 is the perfect coaxial cable for transmission. Diagram of a UK-Band-Solid-Dish-Antenna 12. Aka sand Kurt Above or Aka Band requires more power to transmit signals. The downlink frequency range is 18. 3 to 20. 2 GHz while uplink frequency range is 27. 5 to 31 GHz. The size of the dish for this band is even smaller than C band. It varies from two feet Diagram of a Aka-Band-Solid-Dish-Antenna 12. 1 SIS server/proxy server/gateway The SIS server also acts as a proxy server/gateway. A proxy server is a server that acts s an intermediary between a workstation user and the Internet so that the enterprise can ensure security, administrative control, and caching service.

A proxy server is associated with or part of a gateway server that separates the enterprise network from the outside network and a firewall server that protects the enterprise network from outside intrusion. An advantage off proxy server is that its cache can serve all users. If one or more Internet sites are frequently requested, these are likely to be in the proxy’s cache, which will improve user response time. A proxy can also do logging.

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