Sunday, October 27, 2013

Computer its & Characteristics_DAIBB_ICT

What is a computer? What are its major characteristics?


Definition: The term computer has been borrowed from compute that means to calculate. A computer is an electro mechanical device which has capacity to accept, store, process and retrieve data, according to the user requirements. Technically, a computer is a programmable machine. This means it can execute a programmed list of instructions and respond to new instructions that it is given.
Characteristics of a computer:
The following are the characteristics of a typical computer:
·         Speed: Present day computers operate at a very high speed. A computer can perform several million instructions in one second. For example, it can add or multiply 2,000,000 numbers in a second. There are several different types of computers and they all have different speeds ranging from high to very high. The speed of computers is specified in MIP (Million instructions per second).
·         Accuracy: Computers perform with a very high degree of consistent accuracy. Errors may occur due to a program logic error. These are human errors. Hardware errors are usually detected by the computer system itself. The probability of computer error is small and often traceable to faulty data. Computers rarely make mistakes and can accurately perform all kinds of complex computations.
·         Reliability: Computer systems are particularly adept at repetitive tasks. They do not take sick days and coffee breaks and they seldom complain. Computer systems are widely accepted because of their exceptional reliability. Unlike most humans they are capable of operating under most adverse conditions for extended periods of time without showing any signal of fatigue. Computers consistently provide the same accurate results under all operating conditions.
·         Memory Capabilities: Computer systems have total and instant recall of data and an almost unlimited capacity to store these data. A typical mainframe computer system will have many billions of characters, thousands of graphic images, stored and available for instant recall.
·         Versatility: The same computer can be used for various applications. For instance, a PC can be used to prepare a letter, prepare the balance sheet of company, store a database of employee, send/receive fax message etc. For a computer to perform a new job, all it needs is a program.

Computer now a days has become a driving force of way of life. None we can live a civil life without a computer. With trust and accuracy, this device run, protects, and revive the major systems in our daily life.

Short Notes on Information Technology_DAIBB



 Important Short Notes on Information Technology in Financial Services_DAIBB (Paper-4)



 

ASCII

The American Standard Code for Information Interchange is a character-encoding scheme originally based on the English alphabet. ASCII codes represent text in computers, communications equipment, and other devices that use text. Most modern character-encoding schemes are based on ASCII, though they support many additional characters. It was only developed for communication and first adopted in 1963.

ASCII has been very popular in the computer world. It  contains seven bits to define each letter or character excluding eighth bit for error-checking function. There are 128 specific characters including capital letters, small letters, 0 to 9 digit, special symbols and some specific character having specific different functions.  Thirty-three codes  are used to represent things other than specific characters. The first 32 (0-31) codes represent a chime sound, used  to feed  line as well as to start of a header. The final code, 127 represents a backspace while the first 31 bits are the printable characters. Bits ranging from  48 to 57 represent the numeric digits and 65 to 90  represents the capital letters, while bits 97 to 122 are the lower-case letters. The rest bits represent symbols of punctuation, mathematical symbols, and other symbols such as the pipe and tilde.

Earlier ASCII was developed  only in six bits for a simpler character set. But  finally it has been reconstructed using seven bits for assimilating   lower-case letters, punctuation, and control character sets  to enhance its utility. No other than English characters  has been used in ASCII. ASCII is not used in IBM computers. IBM has its own built-in-code called EBCDIC code containing 256 character sets. Nowadays Unicode character set is replacing ASCII code very rapidly. ASCII is being famous in ASCII art phase that describes the use of the basic character set to create visual approximations of images.


'Personal Identification Number - PIN'


A personal identification number is a secret numeric password shared between a user and a system that can be used to authenticate the user to the system. Typically, the user is required to provide a non-confidential user identifier or token (the user ID) and a confidential PIN to gain access to the system. Upon receiving the user ID and PIN, the system looks up the PIN based upon the user ID and compares the looked-up PIN with the received PIN. The user is granted access only when the number entered matches with the number stored in the system. Hence, despite the name, a PIN does not personally identify the user.

PINs are most often used for automated teller machines (ATMs) but are increasingly used at the point of sale, for debit cards and credit cards. For example, when you take money out of an ATM, you enter your PIN number to prove that you're authorized to make the withdrawal. You might also enter a PIN number if you use your debit card at a retailer (only for POS transactions, not signature transactions).

UPS


Short for uninterruptible power supply, a power supply that includes a battery to maintain power in the event of a power outage. Typically, a UPS keeps a computer running for several minutes after a power outage, enabling you to save data that is in RAM and shut down the computer gracefully. Many UPSs now offer a software component that enables you to automate backup and shut down procedures in case there's a power failure while you're away from the computer.

There are two basic types of UPS systems: standby power systems (SPSs) and on-line UPS systems. An SPS monitors the power line and switches to battery power as soon as it detects a problem. The switch to battery, however, can require several milliseconds, during which time the computer is not receiving any power. Standby Power Systems are sometimes called Line-interactive UPSes.

An on-line UPS avoids these momentary power lapses by constantly providing power from its own inverter, even when the power line is functioning properly. In general, on-line UPSs are much more expensive than SPSs.

A UPS is typically used to protect computers, data centers, telecommunication equipment or other electrical equipment where an unexpected power disruption could cause injuries, fatalities, serious business disruption or data loss. UPS units range in size from units designed to protect a single computer without a video monitor (around 200 VA rating) to large units powering entire data centers or buildings

RDBMS


RDBMS stands for Relational Database Management System. RDBMS data is structured in database tables, fields and records. Each RDBMS table consists of database table rows. Each database table row consists of one or more database table fields. An important feature of relational systems is that a single database can be spread across several tables. This differs from flat-file databases, in which each database is self-contained in a single table.

RDBMS store the data into collection of tables, which might be related by common fields (database table columns). RDBMS also provide relational operators to manipulate the data stored into the database tables. Most RDBMS use SQL as database query language.

Relational database management system (DBMS) stores data in the form of related tables. Relational databases are powerful because they require few assumptions about how data is related or how it will be extracted from the database. As a result, the same database can be viewed in many different ways.



RAM


RAM is an acronym for random access memory, a type of computer memory that can be accessed randomly; any byte of memory can be accessed without touching the preceding bytes. RAM is the most common type of memory found in computers and other devices, such as printers.

RAM is a temporary storage for data. For instance, when you open Microsoft Word (or any program), it goes into RAM because your CPU can get it a lot faster from RAM, than if it tried to get it off of your hard drive. However, RAM is dynamic which means if the power is cut off then any data that is in RAM is lost. Let’s say you are typing a letter, each time you hit the keyboard that data is put into RAM until it can be transferred to your hard drive. If the power goes off then whatever is in RAM while you were typing will be lost.

In common usage, the term RAM is synonymous with main memory, the memory available to programs. For example, a computer with 8MB RAM has approximately 8 million bytes of memory that programs can use. In contrast, ROM (read-only memory) refers to special memory used to store programs that boot the computer and perform diagnostics. Most personal computers have a small amount of ROM (a few thousand bytes). In fact, both types of memory (ROM and RAM) allow random access. To be precise, therefore, RAM should be referred to as read/write RAM and ROM as read-only RAM.


Thursday, October 24, 2013

LIEN, ASSIGNMENT AND SET-OFF




LIEN, ASSIGNMENT AND SET-OFF


                                                                                       

LIEN
Lien defined
            Lien signifies the right of a creditor in possession of goods or security belonging to a debtor to retain them until a debt due from the latter is paid.

            The right of lien arises in law out of business dealings between the parties - the person in possession of the goods or securities and the owner - and does not require any specific agreement, written or oral, to support it.

            It, however, presupposes two things.
-                      Firstly, the person vested with the rights of lien is in possession of the goods or securities in the ordinary course of business.
-                      Secondly, the owner has a lawful debt due or obligation to discharge to the person in possession of the said goods or securities.

In other words, a lien confers a right on the holder to retain goods or securities against the real owner until the debt or obligation for which the lien is exercised, is satisfied or discharged.

            Once the debt is satisfied or obligation discharged, the right of lien is extinguished and the property has to be returned to or kept at the disposal of the owner. Lien is an informal or indirect charge on security.

General lien and particular lien
            There are two kinds of lien,
(i)                 general and
(ii)               particular;

Under Section 171 of the Indian Contract Act, 1872,
(i)                 bankers,
(ii)               factors (mercantile agents),
(iii)             wharfingers (persons owning or taking care of wharfs or landing stages for loading/unloading vessels),
(iv)             attorneys of High Court, and
(v)               policy brokers can, in the absence of a contract to the contrary, exercise lien and relain security for a general balance of account any goods bailed to them.
(vi)             A general lien does not as a rule carry with it the right to sell the property.
The person exercising the lien has simply the right of retention till the dues are paid.

The case of a banker is, however, different. It will be considered in a subsequent paragraph.

In the absence of a contract to the contrary, a particular lien arises, where goods can be retained by the creditor in respect of a particular debt only.

The debt or obligation must have arisen out of some service rendered or labour or money expended on the goods on which the right of lien is to be exercised.

For example, a tailor has a particular lien for his charges on the clothes made by him for his customer.

A carrier has a lien on the goods transported by him for the freight on such goods.

Banker’s lien
            As already stated, a banker’s lien on customer’s goods and securities is recognised by law unless there is a contract, express or implied, inconsistent with the lien.

            Convention and legal decisions have further extended the implications and scope of this right.

            In Brandao vs. Barnett (1846) 12 CL. and Fin. 787, Lord Campbell stated that “bankers have a general lien on all securities deposited with them as bankers by a customer, unless there be an express contract, inconsistent with lien.

A banker’s lien is more than a general lien; it is an implied pledge”.

            It, therefore, follows that the bank can exercise all the rights of a pledgee in case of banker’s lien.

            In the event of default by the customer, the bank has a power of sale without filing a suit against the customer in a court of law, but a reasonable notice is a question of fact depending on the circumstances of each case.

            The banker has also to discharge the responsibilities of a pledgee in the case of banker’s lien.

            For example, he will have to take proper care of the goods and securities as a pledgee.

            It has to be considered as to what securities may be the subject of a banker’s lien. 

            The lien extends only to such securities as a banker ordinarily deals with for his customer.

            The securities should also be owned by the customer in his own right.

            When defining the scope of banker’s lien, Hart says that it is “the right of retaining things delivered into his possession as a banker, if and so long as the customer to whom they belong, or who had the power of disposing them to whom they belong, or who had the power of disposing them of when so delivered, is indebted to the banker on the banker of the balance of the account between them, provided the circumstances in which the banker obtained possession do not imply that he had agreed that this right shall be excluded.”

            The banker thus has the general lien on
(i)                 bills or cheques deposited for collection or
(ii)               pending discount, warrants for dividends paid under mandate or
(iii)             socurities deposited or
(iv)             secure a specific loan but left in his hands after the loan has repaid.

In the latter case, the securities become subject to general lien as the customer by leaving them with the banker is supposed to have redeposited them.
The banker’s general lien will not be extended to securities.
(a)                received for sale,
(b)               deposited upon a particular trust although the trust fails,
(c)                left in his hands after an advance against them has been decliend,
(d)               deposited to secure the specific loan, or
(e)                left inadvertently with him.

A banker cannot also exercise a lien on securities or valuables lying in a locker rented to the customer in the bank’s safe deposit vault.

Regarding bank’s general lien on securities deposited for safe custody, there are two views. Whereas in Paget’s opinion, banker’s lien does not extend to securities deposited for safe custody, Hart seems inclined to make a wider view of the scope of the banker’s lien in such a case.

In deciding whether a particular security is subject to a banker’s lien, the test is how the said security came into the hands of the banker.

If the security is handed over to him in the ordinary courses of business and not for a special purpose inconsistent with the lien, the banker can exercise his right of general lien over the security.

The banker’s right of lien is not barred by the law of limitation which sets a particular time limit for filing a suit.
The debt remains though it cannot be recovered through a court process.

As such, banker’s lien continues over the security irrespective of the fact that the period of limitation has expired. The banker may, therefore, retain the security.

It may be stated that a banker does not have lien over the credit balance lying in a customer’s account. The banker’s right in such a case is a right of ‘set-off.

Letter of lien
No letter or agreement is necessary to create a banker’s general lien. Banks are vested with this right under Section 171 of the Indian Contract Act, 1872.

A bank, however, as a matter of abundant caution, sometimes requires a customer to give a letter of lien enabling it to regard as security for an advance - present or future - any securities held in any other advance given to the customer.

The letter of lien also authorises the bank to sell the securities in default of payment of the debt and apply the proceeds thereof towards the satisfaction of any indebtedness of the customer. The securities were deposited by him for a special purpose inconsistent with lien.

In fact, such a letter combines in it the right of lien with the right of set-off.

A letter or an agreement more or less on the same liens as indicated above, is taken when a customer’s credit balance, or a part of it, is to be held as security for an advance to another customer.

Negative Lien
The banker sometimes asks a borrower to execute a letter declaring that his assets are free from encumbrance at the time the advance is made.

The borrower also undertakes that the assets stated in the said letter shall not be encumbered or disposed of without a bank’s permission in writing so long as the advance continues.

This undertaking is known as a negative lien.

Usually the arrangement is drafted in the form of an agreement. In case the borrower is a limited company, the declaration and the undertaking are incorporated in a resolution of the Board and a certified true copy thereof given to the bank.

In Bank of India vs. R.F. Cowasjee (A.I.R. 1955 Bom. 419, November), it was held that a negative lien is in the nature of personal assurances or undertaking which, although of binding effect, give no right to the promissee, say, the creditor, to proceed against the property itself by bringing it for sale.

It would thus be seen that a negative lien, where no right of the nature of encumbrance is created, does not amount to a charge. As such, the provisions of Section 125 of the Companies Act, 1956 relating to registration of charges would have no application to the case.

Lien on company’s own shares
            Where an advance is made by a banker (say, X) on the security of shares of a company (say, Y), it should be remembered that the company (Y) will probably have, under its articles of association, a first and paramount lien upon its own shares for any indebtedness of the shareholder to it (Y).

            Such lien is not debarred by the law of limitation so long as the indebtedness exists, although its recovery by suit may have become time-barred (Unity Co. Pvt. Ltd. vs. Diamond Sugar Mills and others (1970)2 Comp. L.J. Calcutta).

Lien and set-off distinguished
            The banker’s right of lien can be exercised on the money lying with him so long as it is earmarked.

            Where it has ceased to be such a separate earmarked sum, the bank has no lien but the right of set off.