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Blackboard Learning System

All users have to register and need a username and password to access the software. At UAE University, students and faculty have the same ACE domain username and password for both the Oasis and linked Banner system and Blackboard 6.1, which makes it convenient. Once the user logs into Blackboard, a personal My Institution page is displayed. This main page has several main areas including a series of Navigation buttons, Navigation tabs (where the user can navigate between different sections of the program), a Module area (which contains announcements, course links etc.), a Tools area (containing utilities such as My Grades, Send an E-mail, Calendar etc.) and a Search Box (which can be used for information retrieval on the web from the Blackboard site itself). Within the Module area, students can see the courses they are registered for on Blackboard. The courses can also be accessed by clicking on the My Courses tab within the My Institution page.

The Blackboard course environment consists of two views. The Student View is the only view available to students enrolled on a course. In this view, a number of navigation buttons can be accessed. The exact navigation buttons themselves can be customized by the instructor, but typically include buttons such as Announcements, Course Information, Course Documents, Faculty Information, Assignments, Websites for the Course, Tools, Communication and Assignments. In contrast, the Control Panel is only available to Instructors, and this is the place where the Instructor manages the entire course and essentially constructs and tailors the course in their own way. As a user of Blackboard for several semesters now, I would highly recommend Blackboard as a course management tool for Instructors. Most Instructors need only general familiarity with the standard Windows environment to quickly come to grips with the system. In our Department and College, we have run introductory workshops in-house for new faculty on Blackboard, and it is our experience that this initial kick-start training period can even be limited to approximately ninety minutes. Once faculty are au fait with the basic features of Blackboard, the numerous additional features of the system can be explored at a later stage, when the Instructor begins to post material on the system, do on-line quizzes etc. Of course, it is essential that the University has a central Blackboard Support and Help Centre on a permanent basis to help faculty using the system and to run more comprehensive training programmes of some of the more advanced features. Additional features can then be explored and newsletters outlining tips on using Blackboard for Active Learning purposes, problems encountered, new features etc. are also a useful way of showing faculty the true benefit of this powerful software.

The ease of use of Blackboard is exceptional. As a former user of WebCT, I must admit I found the Blackboard interface and navigation easier to learn at the beginning especially in relation to the posting of course information, announcements etc. One of the nice new features of Version 6.1, is the WYSIWYG (What You See Is What You Get) and spell-check facilities of the text-box editor. This facility was not available in earlier editions, and having access to standard Word buttons such as Bold, Italics, Justification etc. is a welcome new feature. However, as a chemist, it still is not possible to create subscripts and superscripts smoothly using Blackboard i.e. the panel of buttons is limited and it was not possible to create the customary superscript and subscript buttons, as can be done neatly in Word, by dragging these down via Tools, Customize and Commands. Of course, one can easily work around this problem by creating your text in FrontPage, and pasting the HTML code in the textbox, or simply include the HTML tags. Another possibility is to use the embedded WebEQ Equation Editor. However, all these methods are somewhat cumbersome, especially for chemists.

Adding course information is also similar to posting an announcement, and the information can be added as an item, folder, external link etc. Faculty information can also be posted readily. A nice feature of this utility is that separate folders can be created for faculty; for example if you have joint faculty co-teaching on a course. Within each folder, separate profiles can be created, with useful information for the student such as an Instructors office hours, their e-mail address, the location of their office on campus, their homepage URL etc. In addition, the photograph of the Instructor can be posted. However, it is advised that for optimum results, a picture of 150 x 150 pixels in size should be used. Course Documents also has similar features to Course Information, and PowerPoint slides, Word documents etc. can be posted here, which may correspond to different chapters of a textbook etc. Furthermore, as the course is only accessible to the students and the Instructor teaching the course, not everybody can see the material. PowerPoint slides can also be posted in such a way that the students can only see the slides, without being able to edit them if an Instructor wishes. An e-mail can also be sent to all students and Instructors having access to the course, which is an excellent facility of the system. This makes efficient and prompt direct contact with the students.

One other new feature which was introduced in the 6th release of the Blackboard Learning System has been that of the Assignment Manager. This new tool actually combines the file exchange capabilities of the Digital Drop Box, with the functionality of the Gradebook in Blackboard. The Digital Drop Box is still present in the system, and can be used to transfer files to users. This is an excellent feature, as instead of forwarding e-mail attachments, one can send a file to a student very quickly through Digital Drop Box. I have used this facility several times in my own classes teaching General Chemistry and Engineering Applications, where the students use their own personal Laptops in class, in a wireless Network environment.2 However, one problem with this facility that I found is that you can only remove one file at a time. This can be tedious if you receive say twenty-five files from students as homework assignments. There is no select all, delete facility. In contrast, the new tool, Assignment Manager is an area where course assignments can be posted, related files can be uploaded and grades published. It is the latter point that really distinguishes this feature from the Digital Drop Box. The Digital Drop Box should be used if you wish to exchange files between students etc, but where you do not wish to give grades. The former in comparison should be employed where a final grade will be assigned to a student’s work.

One of the most useful facilities of Blackboard has to be its Assessment facilities. In Pool Manager, a bank of questions with no point values can be created by an Instructor. Pool Manager can then be used to generate questions for on-line quizzes, exercises and tests. This facility should be used before importing the question banks into the Test Manager. One key advantage of Pool Manager is that the pool of questions can easily be readily exported. This gives great flexibility in courses where multiple Instructors are involved, as each can create banks of questions and transfer them to each other. With this utility, vast libraries of question banks can be built up in a Department on an ongoing basis each semester. Blackboard itself has the provision for seven different types of questions: multiple-choice, true/false, fill in the blank, order, multiple answer, match two lists and essay. Although the latter can be used, in the opinion of this reviewer, this type of question is probably not best suited to Blackboard, as there is a limit on the twenty answer patterns that can be used, and spelling mistakes, additional spaces and punctuation can invalidate an answer. In addition, an essay type question needs the Instructor to grade it. Having created a pool of questions in Pool Manager, the questions can then be imported into Test Manager for use in a test. One slightly annoying feature in Version 6, is that when you import a bank of questions from Pool Manager, there is no select all facility, which surprisingly was present in an earlier version. Hence, one has to physically go through each question and tick its box to import the question. This can be very time-consuming especially if you create an MCQ test for students of approximately 100 questions. Another cautionary note which academic users should be aware of is in relation to undesired student’s behaviour during online assessments. In several classes I have had the problems that students get an error message during an on-line test stating that they have already chosen to go to the next question, and please wait etc. These messages according to my colleagues at the Blackboard Support Unit at the University, appear to be due to the undesired behaviour of double-clicking the submit or next button. As the Web is a single-click environment, where double-clicking is not necessary on standard web pages, this seems to be the root of this problem, which can throw some students out in on-line assessments. The problem became so widespread in some of my classes, that I now have to mention this to them on a continuous basis to get the message across in order to avoid such error messages. Hopefully the developers will try and see some way round this potential problem in a future release.

I tried also bringing chemical structures, which I created in ISIS Draw 2.53 into Blackboard in the Test Manager. This can easily be done, using the Creation Settings button. I saved a structure of an organic ligand, which I created initially in ISIS Draw, and converted it to a gif file using Microsoft PhotoEditor. I then was able to import this directly into Test Manager.

However, the best feature of the Assessment Tools is that of the Gradebook. This can easily be customized and rearranged to include mid-Semester and final examinations, quizzes, progress examinations etc. Once an on-line quiz or progress examination is taken on Blackboard, the grades are automatically imported into the Gradebook, which then can be weighted accordingly and can even be downloaded into an Excel spreadsheet in CSV file format. This feature is excellent, and with the collective utilities of the Test Manager and Gradebook, it has saved me personally hours of monotonous grading for many of my courses, where I employ MCQ type questions. I would definitely recommend Blackboard to any faculty thinking along the lines of a Laptop project type initiative.2

Blackboard has several other neat advanced features such as a Discussion Board, a Collaboration Session facility, Survey Manager and an excellent Course Statistics package, where you can track your student’s usage of the course materials.


Assignment Lanka Populer Posts ever

Token passing

In Token Ring another access method is used, called Token Passing.

With Token Passing, a small message, called a token, constantly circulates around the ring. If the token is marked as free, the host that receives the ”free” token can transmit its data and mark the token as busy. All the hosts along the ring receive the data and the busy token, until the host that sent the original message sets the token free again.

Right now the token is with host B, and it is marked free. Let’s say that host B wants to send data to host D. B sets the token to busy and adds its data. The host C has now received the token and the data, but since C is not the receiver it just passes on the token and the data into the ring.

The host D receives the data and sets the token to copied. The token and the data are then
passed on into the ring.

The host A just passes on the token and the data. The host B sees that the data has been received in a proper way by D. B therefore deletes the data and sets the token …

Network operating systems

After the physical network the NOS, Network Operating System, is the most important part in a PC network. The network operating system is responsible for the levels 3 to 7 in the OSI model. This means that NOS is independent of the type of network. It works in the same manner on an Ethernet as a Token Ring.

There are two types of NOS. The first type is called "peer to peer” which means that no dedicated server is needed. The other type is server based and is used for larger, more demanding networks.

There are many vendors with their own types of NOS on the market.

The leading systems for "peer to peer” based NOS are NetWare Lite and Windows for Workgroups.

The leading systems for server based NOS are Novell NetWare, Windows NT and OS/2 LAN Server.


CSMA/CD stands for "Carrier Sense Multiple Access with Collision Detect”. CSMA/CD
is a random control access method.

The CSMA/CD access method is used as the access control method in Ethernet and is defined in a standard from IEEE. The CSMA/CD algorithm is quite simple and the efficiency for an ordinary Ethernet is about 65%. This means that the effective bandwidth for a 10 Mbps Ethernet is about 6.5 Mbps. The rest is lost, mainly due to collisions.

Before one host will transmit it must ”listen” on the medium whether or not another host is
transmitting. If the medium is ”quiet” the host can send its data. The term "Carrier Sense" indicates that a host listens before it transmits.

"Multiple Access" means that many hosts can be connected to the network and all hosts
have the same right to transmit.

With CSMA/CD, it occasionally happens that two hosts send their packets at the same
time. This will make a collision on the network. The information about the collision is

The History of Local Area Networks, LAN

In the mid 70's Robert Metcalf and David Boggs at Xerox experimented with communication
between the computers. This became the first implementation of Ethernet.

In 1982, the second version of Ethernet was implemented by Digital, Intel and Xerox. This is
the version of Ethernet that is still in use today.

In the mid 80's the first PC-networks started to appear. Network components such as
bridges and routers were now available on the market.

The normal bandwidth of the Local Area Network today is 10 Mbps.

In the near future we will see higher bandwidths, such as 100 to 1000 Mbps.

windows vista wireless

How to connect a Vista computer to a wireless network using WLAN AutoConfig This document will serve as a guide for Microsoft Vista clients in joining a wireless network using WLAN AutoConfig service.

What is WZC or WLAN AutoConfig?

Wireless Zero Configuration (WZC) or WLAN AutoConfig is a service included with modern versions of Microsoft Windows that dynamically selects a wireless network to connect to base on a user's preferences and various settings. This can be used instead (or in the absence) of a wireless network utility from the manufacturer of a computer's wireless networking device.

To join a wireless network:

1. Open the Start menu and click Control Panel.2. In the Control Panel Home window, click View network status and tasks.

2.If you are using Classic View, double- click Network and Sharing Center.

3. Click Connect to a network.

4. Select your network from the list and click Connect.

5.If security is enabled on the network, you will be asked to type your network security…


Digital Subscriber Line (DSL)

DSL Digital Subscriber Line (DSL) provides a dedicated digital circuit between a user’s premises and the Internet through the telephone company’s central offi ce via ordinary copper telephone wires. The two primary forms of DSL are Asymmetric Digital Subscriber Line (ADSL) and Symmetric Digital Subscriber Line (SDSL). ADSL has a higher download speed (1.544 to 6.1 Mbps downstream) and a lower upload speed (16 Kbps to 1.5 Mbps). SDSL’s download and upload speeds (1.544 Mbps) are equal. SDSL does not provide voice capabilities. ADSL – which is more widely used and available – must be within 18,000 feet of the central offi ce while SDSL users must be within 12,000 feet. Some companies, however, have begun to use new technologies such as fi ber lines and/or repeaters to extend DSL capabilities up to 25,000 feet.

An ADSL modem has a “plain old telephone service” POTS) splitter and a channel separator. The POTS splitter divides the phone line into two channels (voic…

how to setup wifi with windows xp

Configuration -Wifi with Windows XP

If your computer is not currently connected to a wireless network, Windows may present the following message to let you know that it has detected one or more of them. Click on the Wireless networks detected balloon to display a list of available networks.

If your computer is already connected to a wireless network or does not present the above message, right-click on the Wireless Network Connection icon on the right of the Task Bar and then click on View Available Wireless Networks to display the list of available wireless networks.

From the Wireless Network Connection window, click on Change advanced settings under Related Tasks. Do not choose JMU-Official-Wireless from here the first time.

If you are logged in as a regular (non-Administrator) user, Windows will let you know that you cannot change some settings. Click on the OK button.

The Wireless Network Connection Properties window will come up on the General tab. Click on the Wireless Networks ta…

Hybrid topologies

Different topologies may be interconnected to form subnets to a main network. It is possible, for example, to connect a star, a hub and a ring together beneath another star topology network.

Star Topology network

Star network or the Star Topology network is a network design which Computers in a star, The topology are connected by cables to a hub. In this management of the network is made much easier (such as adding and removing devices), because of the central point. However because it is centralized more cable is required.
Because most star topologies use twisted-pair cables, the initial installation of star networks is also easier.

"Star topology diagram" 

If one computer fails the network will continue to function, but if a hub fails all computers connected to it will also be affected. Star topologies are, or are becoming the topology of choice for networks.

Star Topology Advantages:

The Cabling, Hardware per node is Cheaper than a mesh topology. (less cable, less hardware per node) In the Star Topology the Single links make the network easier to reconfigure. As we discussed above Low cable housing requirements compared to "mesh topologyAnother good thing is If one link is dam…


IEEE standards for LANs describe different types of transmission media. It could be cable,
fiber or wireless.

Cables typically come in two flavors: twisted pair cables or coaxial cables.

Twisted pair cables
A twisted-wire consists of two insulated strands of copper wire that have been braided.
Often a number of twisted-wire pairs are grouped together into a twisted pair cable. Twisted
pair cables are used both for data communication and telephony.
In the picture the twisted pair cables would typically be used in the star topology in the
middle, that is between the hub and the connected hosts.

Coaxial cables
Coaxial cables consist of a central conducting copper core that is surrounded by insulating
material. The insulation is surrounded by a second conducting layer, which can consist of
either a braided wire mesh or a solid sleeve. In the picture, the coaxial cable would typically
be used for the bus network seen on the top.

Optical fiber:
Optical fibers can be used to carry data signals in th…