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Conceptual models, such as those written in UML, are also concerned with structure The structure in conceptual models is reflected partially in the inheritance hierarchies of the subclass relation: One class is a subclass of another class Structure is also reflected in the part-of relation: One class is a part of or constitutes another class Structure is also reflected in other arbitrary relations In a UML model of a human resources application; for example, two classes may be in an employee-of relation (similar to the relation in a database conceptual schema, which is usually constructed in an entity-relation or extendedentity-relation model), as in Figure 82 Note that this is roughly the UML equivalent of the OKBC ontology in Figure 81 (though without the underlying logical richness and precision of the latter; richness and precision enables machine semantic interpretability).

IBM s Chief Information Officer, Phil Thompson, recently stated in an interview on CNET, We have $27 billion of e-commerce floating through our systems at an operating cost point that is giving us leverage for enhanced profitability..

Structure can typically be represented by a node-and-edge graphical notation in other words, using a node and edge or link, the latter of which can be directed (symbolized by an arrowhead pointing at the node the relation is directed toward, as in Figure 83) The general study of such node-and-edge models is called graph theory, where a graph is a more complicated data structure than a tree, which is a simpler hierarchic structure such as we saw in the previous chapter on taxonomies.

In this chapter, various multiple access schemes, carrier modulation, and data mapping will be studied for UWB communication systems Digital communication requires mapping of the stream of bits into waveforms at the transmitter and conversely demapping is achieved at the receiver through various reception algorithms These mapping and demapping operations are commonly referred as modulation and demodulation In a more formal expression, modulation is de ned as the mapping of a sequence of binary digits into a set of corresponding waveforms [1] The mapped waveform can correspond to a single bit, or a sequence of bits The term modulation is also often used to imply other concepts Baseband signals are commonly mixed by carriers to up-convert them into intermediate frequencies (IF) and/or radio frequencies (RF) Carrier modulation, which is the process of embedding the information into a radio carrier [2], is also commonly referred as modulation.

A graph (think of a complex network) is more complicated than a tree because it is a tree with either directed or undirected links arbitrarily connecting nodes, whereas a tree is a data structure that just has edges or links (branches), a distinguished node called the root (as we saw in the last chapter) into which no edge enters, and from the root there is a unique path to every node The main difference between a graph and a tree is that a graph may have multiple paths to nodes A directed graph is a graph in which the edge is directed from one node to another (think of a relation like father-of, where the edge from John to Harry signifies that John is the father-of Harry).

Note that a correctly keyed card is not needed; we simply used one to design the attack. We eventually traced this back to RFC 1042.

It is further possible to nd certain multiple accessing and signaling techniques being referred as modulation techniques in the literature [3 5] In the sequel, we will commonly refer the mapping of the information into waveforms as data mapping, which will be the main focus of our chapter Different carrierbased and carrierless implementations of UWB systems as well as certain multiple accessing schemes that may be referred to in the literature as modulation approaches will be covered under UWB signaling techniques Within this context, in Section 42, TH and DS IR signaling will be presented using a uni ed signaling model The same section will address two other popular UWB signaling approaches: multiband-UWB and multicarrier modulation schemes In Section 43, several binary and higher-order data mapping formats for UWB will be analyzed in terms of their BER performances Section 4.

An undirected graph means that there is no arrow, but only a simpler edge (think of the relation friend-of between John and Sue: John is the friend-of Sue and Sue is the friend-of John) A graph without cycles (links between a child node and one of its ancestors) is called an acyclic graph A graph with cycles (links between a child node and one of it parents) is called a cyclic graph Directed graphs with cycles are called directed cyclic graphs; directed graphs without cycles are called directed acyclic graphs (DAGs) and are typically the data structure used for most complex structures, such as ER, UML, and ontology models There is an implementation cost incurred with cycles (ie.