Introduction to Data Access

... Introduction to Data Access W elcome to Chapter 5, where we will lay out the cornerstones of working with databases. This chapter is an introduction to the integration with popular Java data- access ... happen as you expect. It’s up to you, as a developer, to decide how you expect them to occur and to use transactions to meet your goals. CHAPTER 5 ■ INTRODUCTION...

Ngày tải lên: 05/10/2013, 04:20

... www.verypdf.com to remove this watermark. 1 Approaches to Compression How can a given a data file be compressed? Compression amounts to eliminating the redundancy in the data, so the first step is to find ... approach to lossy compression. The idea is to start with a finite list of N symbols S i and to modify each of the original data symbols to the nearest S i . For example,...

Ngày tải lên: 14/12/2013, 15:15

... determines whether it is a token or raw data. A token is used to obtain data from the dictionary and write it on the output. Raw data is output as is. The decoder does not have to parse the input in ... X to its successors in the tree (from left to right and bottom to top). If the immediate successor has frequency F + 1 or greater, the nodes are still in sorted order and there...

Ngày tải lên: 14/12/2013, 15:15

... frequency. It is also possible to modify this transform to conserve the energy of the data vector. All that’s needed is to multiply the transformation matrix W by the scale factor 1/2. Thus, the product ... changes along the basis vector) become higher. To illustrate how this matrix identifies the frequencies in a data vector, we mul- tiply it by the following test vectors (1, 0, 0...

Ngày tải lên: 14/12/2013, 15:15

... compressed in a single left -to- right, top -to- bottom scan; (b) progressive mode where the image is compressed in multiple blocks (known as “scans”) to be viewed from coarse to fine detail; (c) lossless ... DCT when applied to a continuous-tone image and to a discrete-tone image. We start with the highly correlated pattern of Table 5.10. This is an idealized example of a continuous-t...

Ngày tải lên: 14/12/2013, 15:15

... symbols. The decision is to exclude y, and this is done by setting array element excl[y] to the context index (i.e., to point to c). As long as the algorithm scans for matches to the same context ... matched to some string of length 3 (i.e., a string “ cde”), and we try to match it to a longer string. The two symbols “de” are hashed and produce a pointer to string “lmcde”. T...

Ngày tải lên: 14/12/2013, 15:15

... method to “predict” (to assign probabilities to) the data to be compressed. This concept is important in statistical data compression. When a statistical method is used, a model for the data has to ... Shannon–Fano constructs its codes top to bottom (from the leftmost to the rightmost bits), while Huffman constructs a code tree from the bottom up (builds the codes from right...

Ngày tải lên: 14/12/2013, 15:15

... method to “predict” (to assign probabilities to) the data to be compressed. This concept is important in statistical data compression. When a statistical method is used, a model for the data has to ... Shannon–Fano constructs its codes top to bottom (from the leftmost to the rightmost bits), while Huffman constructs a code tree from the bottom up (builds the codes from right...

Ngày tải lên: 14/12/2013, 15:15

... as the logical storage medium for an OLAP database and are what users manipulate to access their data. Topic Objective To introduce OLAP database components. Lead-in OLAP databases are ... to the data mart and contain data particular to a subject. Multidimensional data marts use star schemas behind the scenes to support multidimensional data structures called cub...

Ngày tải lên: 21/12/2013, 19:15

... a Data Mining Model Mining Model DM Engine Data To Predict DM Engine Predicted Data Training Data Mining Model To create a model, you must assemble a set of data where the attributes to ... applied to future data to predict outcomes or classify data. Topic Objective To explain the methodology for creating a mining model and to define terminology. Lead-in W...

Ngày tải lên: 24/01/2014, 19:20