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Quality management refers to the methods by which business processes are controlled, monitored, and managed to bring about continuous improvement. The scope of a quality management system in an IT organization may cover any or all of the following activities: Software development Software acquisition Service desk IT operations Security The components that are required to build and operate a quality management system are Documented processes Each process that is a part of a quality management system must be fully documented. This means that all of the tasks, notifications, records, and data flows must be fully described in formal process documents that are themselves controlled. Key measurements Each process under quality management must have some key measurement points so that management will be able to understand the frequency and effort expended for the process. Measurement goes beyond simply tallying and must include methods for recognizing, classifying, and measuring incidents, events, problems, and defects.

The concept of the limit in calculus is very important. It describes what happens to a function as a particular value is approached. The derivative, one of the major themes of calculus, is defined in limit terms. This short chapter will help you to think in terms of limits. The first thing to understand about limits is that a limit of a function is not the value of the hction. The change in thinking (fiom value to limit) is important because most functions are understood as a series of mathematical operations that can be evaluated at certain points simply by substitution. The (polynomial) h c t i o n y = x2 + 2x + 3 can be evaluated for any real number: replace x with the number and perform the indicated operations. Askmg the limit of this h c t i o n as x approaches 2, for example, is an uninteresting question. The fhction can be evaluated at 2 or any point arbitrarily close to 2 by substituting and performing the operations. Other functions, such as polynomial fractions, cannot be evaluated at certain points and these functions are best understood by thinking in terms of limits. The h c t i o n y = (x2 - 4)/(x + 2) can be evaluated for any real number except -2. Replacing x by -2 produces the meaningless statement 0 / 0. Remember that any number times 0 is 0, but any number divided by 0 is "meaningless" (including 010). Looking at the limit of the hction, as x approaches -2, tells us about the h c t i o n in the vicinity of -2 - The limit of the firnction is a convenient phrase for the question, "What happens to the function as a certain value is approached " Writing this in mathematical notation we get the following: lim

The circuit in Fig. 2-4 contains a single loop. Starting at V1 and moving clockwise around the loop, we take the sign of each voltage to be positive or negative depending on whether we encounter a voltage drop or a voltage rise, respectively. Applying KVL to the circuit shown in Fig. 2-4 gives V1 + V2 + V3 + V4 = 0 To see how this works in practice, let s work two simple examples. EXAMPLE 2-3 Consider the circuit shown in Fig. 2-5. Find the unknown voltage, Vx . SOLUTION Starting at the 5 V element, we will consider a clockwise loop around the circuit as indicated by the arrow drawn in the center. Voltage drops in the clockwise direction are positive, so 5 + 20 12 + Vx 18 = 0

Part I:

you would access its members through a pointer, like this:

public NotFoundException() : base() { } public NotFoundException(string str) : base(str) { } public NotFoundException(string str, Exception inner) : base(str, inner) { } protected NotFoundException( System.Runtime.Serialization.SerializationInfo si, System.Runtime.Serialization.StreamingContext sc) : base(si, sc) { } }

Just as in Example 5.7, x 4 e3x and x 3 e3x both tend to zero. We conclude that our limit equals 0.

using (obj) { // use obj } using (type obj = initializer) { // use obj }