Categories
Case Study

FIT4037: Week 7

Case studies seventh week was a tough one. A large group submission was due which took a lot of time and planning, however the end product was not of a very good standard.

Although this can be frustrating it is worth analyzing why we, as a group failed to return a high quality submission. I have identified some of the factors that played against us:

Team Management factors:

  • Lack of motivation – At each stage of the assignment we all lacked motivation (some more than others). In ‘real-life’ environments there is generally either a financial motivator or ethics (in the case of volunteers).
  • Lack of a common goal – Not all of our team has the same goal for the subject, so whilst a team member may be achieving their goals the group may fall short of other members’ goals.
  • Lack of defined consequences –  If a team member failed to perform, there was not defined consequence. This is something we should have defined clearly.

Individual factors:

  • Ability and Knowledge – Most companies have a minimum of 5 weeks training plus 3 month probation for any complex jobs. I can now understand the value of ensuring team members possess the tools they need to do a job. Relying on team members to ‘pick it up as they go’ can work out well but is very risky.
  • Clear communication – If something is not going well it is the responsibility of the team leader to identify this and amend it. Staying calm and positive may not be the best way to communicate impending disaster.

There is a lot more to team dynamics than this but these are some small points that I took out of the last task.

Categories
Data Communications

FIT9020: Week 6

Data Communications sixth week was a follow up on the assignment topics:

  • TCP/IP
  • ARP
  • DHCP
  • more wireshark analysis

The lecture was an audio recording which gave us a very nice overview of routing.

Three major types of routing:

  • Centralized routing
  • Static Decentralized routing
  • Dynamic Decentralized routing (adaptive routing)

Al three are used through the internet.

source - Alan's Recording: Routing and TCP example

The recording followed some example of HTTP requests travelling through a network.

Categories
Grid Computing

FIT5164: Week 6

Grid computing’s 6th week provided a look into clusters, specifically:

  • Clusters vs Grids
  • Benchmarking techniques
  • Cluster and Grid programming environments
clusters can represent 1 node in the grid

Discussion of a cluster implementation method, Beowulf described how some clusters differ. A key characteristic of clusters is their interconnect technologies, some of the options are:

  • Fast Ethernet
  • Gigabit Ethernet
  • 10 Gigabit Ethernet
  • Myrianet
  • Infiniband

For a detailed list and comparison: http://en.wikipedia.org/wiki/List_of_device_bandwidths#Local_area_networks

It is also worth noting that latency can become more important than bandwidth is many cluster networks. This would be dependent on the programs running on the cluster.

Categories
Internet Application Development

FIT5032: Week 6

Internet Application Development week 6, an introduction to C#.

The fist part of the lecture covered the basic data types and operators (most of which are the same as Java). Control structures and operators came next, again these reflected Java very closely.

Internet Application Development week 6, an introduction to C#.

The fist part of the lecture covered the basic data types and operators (most of which are the same as Java). Control structures and operators came next, again these reflected Java very closely.

Collections in the C-Sharp language are again a mirror of the Java language.

Functions are the methods of Java:

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string MyFirstFunction(string Name, int Age)
{
...
...
...
return "Confirmed";
}
its ok for microsoft to copy open source but not the other way around...

To give a feel for the syntax and a useful tool, the code snippet below draws a table of web server information dynamically.

Categories
Case Study

FIT4037: Week 6

Week 6 of case study consisted of a lecture and tutorial by Enjoo Lim. The lecture reviewed the basics of Database design which was a nice refresher. Points covered were:

  • Conceptual modelling
  • Logical modelling
  • 1st normal form
  • 2nd normal form
  • 3rd normal form

After last semesters assignments going to BCNF is a fairly straight forward operation. From our experience on this assignment it is clear that if you dont get the conceptual model right none of the subsequent stages will go smoothly.

The tutorial gave us some time to work in our teams on the task due the following week. At the time of writing this I am compiling our Functional Specification report. There is a clear difference in the level of each teams memebers submissions, to the level that to attain and even level throughout the report would require redoing entire sections. From doing this assigmnet I have found that Object Oriented modelling for Web sites does not fit the same as for a stand alone java program. I will need to do some research on modelling for web systems.

Categories
Data Communications

FIT9020: Week 5

Data Communication, week 5 was unfortunately a  missed class for me due to illness. A summary of the lecture on Network and Transport layers are as follows:

  • TCP/IP!

TCP segment (source: week 5 lecture notes)
  • Review of three-way handshake conducted by TCP
  • User Datagram Protocol [UDP]
  • IP packet contents:

IP Packet (source: week 5 lecture notes)
  • Addresses and subnets
  • MAC addresses
  • Address resolution ARP
  • DNS processes

Categories
Grid Computing

FIT5164: Week 5

Week 5 of grid computing comprised of a lecture focusing on data transfer protocols for the grid environment. The tutorial returned to the Grid Security Infrastructure [GSI] covered in the previous weeks lecture.

The lecture covered 4 protocols for data transfer within a grid:

  • GridFTP
  • SCTP
  • Fast TCP
  • Sensor networks

GridFTP allows for 3rd party transfers which is the major practical difference apart from transfer speed.

gridFTP enables 3rd parties to move data around the grid

We delved into the methods by which these protocols provide advantages over standard file transfer. One question this raised in my mind was why these protocols aren’t the standard if they are superior. I guess the answer to this question lies in the need for most server to try and limit the amount of bandwidth the provide to individuals.

The first assignment for this subject is due this week, I found the specification a little bit vague and am concerned that my report will not hold enough technical details. The lack of technical detail has revealed that my depth of knowledge for this subject is not very sound so it will be a priority over the mid semester break to get some books and clarify my understanding.

Categories
Internet Application Development

FIT5032: Week 5

Week 5 of Internet Application Development began our move towards dynamic page development. The topics covered were:

  • HTTP protocol review
  • HTML forms review
  • ASP.NET Standard server controls
  • Event driven programming and postback

As HTTP has been covered in detail through FIT9020 Data Communications I will skip this topic, noting that it is a stateless protocol. The diagram below illustrates how asp.net pages are processed from HTTP requests:

Categories
Case Study

FIT4037: Week 5

In week 5 of Case Study we discussed risk. There are a number of risks associated with system development, most stemming from:

  • communication between client and  developers
  • team issues within development team
  • inability of client to clearly define and agree on system requirements

Reviewing these risking and mitigating or managing them is critical for the success of system development.

In regards to Project we are working on as a team I am really finding that it is taking too much of my study time for the lesson that working in teams is difficult. At present my main goal for the unit is to pass whilst preventing it from adversely affecting my grades for other subjects.

Categories
Data Communications

FIT9020: Week 4

The Data link Layer was covered in week 4 of Data communications, which was another high detail lecture [All Trains Now Depart Promptly -> Application, Transport, Network, Data Link, Physical] .

Using both Logical Link Control [LLC] and Media Access Control [MAC] the Data Link layer controls when computers transmit data, detects and correct transmission errors and identifies the beginning and end of messages.

Reminder, half duplex is one message at a time, full duplex (enabled by co-axial cables) message can pass each other.