data storage memory ppt
Tài liệu Module 4: Designing a User Data Management Strategy pptx
Ngày tải lên :
10/12/2013, 15:15
... Designing a User Data Management Strategy 3
Determining Current User Data Environment
?
?
?
What Is User Data?
What Is User Data?
?
?
?
Which User Data Is Currently Stored?
Which User Data Is Currently ... aware of the current data storage characteristics.
Consider the following issues when documenting your plan for managing users’
data:
What is user data?
User data is data that is created ... User Data Currently Stored?
Where Is User Data Currently Stored?
?
?
?
What Is the Current Use of Offline Data?
What Is the Current Use of Offline Data?
?
?
?
What Is the Current Use of Roaming Data?
What...
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Tài liệu Module 5: Embedding XML Data in HTML pptx
Ngày tải lên :
10/12/2013, 16:16
... nature of a data island.
!
Describe how to use Data Source Objects (DSO) to display XML data
islands in an HTML page.
!
Create an XML data island in an HTML file.
!
Bind XML data to HTML ... 5: Embedding XML Data in HTML
#
##
#
Using Data in Web Browsers
!
Delivering Data from the Web Server
!
Using Client-Side Data Source Objects (DSO)
!
Presentation vs. Data
!
Internet Explorer ... Objects, and DHTML
data binding simplify data access and presentation on the Web.
Slide Objective
To introduce the concept of
data access and data- aware
Web pages.
Lead-in
Data access is now...
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Tài liệu CUSTOMER SATISFACTION USING DATA MINING TECHNIQUES ppt
Ngày tải lên :
11/12/2013, 23:15
... BASED DATA MINING TECHNIQUES
The objective of data mining is to extract valuable information from one’s data, to discover the ‘hidden
gold’. In Decision Support Management terminology, data mining ... one search for patterns of information in data (Parsaye, 1997).
Figure 2: Rule Induction process
Data mining techniques are based on data retention and data distillation. Rule induction models ... rule induction data mining.
Furthermore, it is examined whether the implementation of the two methodologies may offer a solution
to the problem of missing data, in the initial data set.
KEYWORDS:...
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Tài liệu Microsoft Access 2007 Data Analysis P2 pptx
Ngày tải lên :
13/12/2013, 03:15
... limitation.
This is not to say that Access has unlimited data storage capabilities. Every bit
of data causes the Access database to grow in file size. An Access database has
a file size limitation of 2 gigabytes. ... will be stored. All other database objects will refer to the tables in
your database for data, whether asking questions of the data or creating
reports based on the data. This section covers ... querying data to get fast results, but it’s important to
understand the basics of the relational database concept before pounding
away at data. A good understanding of how a relational database...
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Tài liệu A Concise Introduction to Data Compression- P2 ppt
Ngày tải lên :
14/12/2013, 15:15
... not reserve any memory space for them. As a child is added to
the node, memory space should be claimed for it. Recall that no nodes are ever deleted,
so there is no need to reclaim memory space, ... the compressed data on a file, the variance of the code
makes no difference. A small-variance Huffman code is preferable only in cases where
the encoder transmits the compressed data, as it is being ... watermark.
2
Huffman Coding
Huffman coding is a popular method for compressing data with variable-length codes.
Given a set of data symbols (an alphabet) and their frequencies of occurrence (or, equiv-
alently,...
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Tài liệu A Concise Introduction to Data Compression- P3 pptx
Ngày tải lên :
14/12/2013, 15:15
... which makes it so useful in data compression,
is that it takes correlated input data and concentrates its energy in just the first few
transform coefficients. If the input data consists of correlated ... the
quantized coefficients. This results in data items that are not identical to the original
ones but are not much different.
In practical applications, the data to be compressed is partitioned into ... as 3, 4, or 6 result in many small sets of data items.
Such a small set is transformed to a small set of coefficients where the energy of the
original data is concentrated in a few coefficients, but...
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Tài liệu A Concise Introduction to Data Compression- P4 pptx
Ngày tải lên :
14/12/2013, 15:15
... for the
entire 64-pixel data unit is the 46-bit number
1111111111100111010001001101101110111010101010.
These 46 bits encode one color component of the 64 pixels of a data unit. Let’s assume
that ... set of basis images
that have higher and higher frequencies. Given a data vector, the DCT separates the
frequencies in the data and represents the vector as a linear combination (or a weighted
sum) ... This version of the DCT is applied to small parts (data
blocks) of the image. It is computed by applying the DCT in one dimension to each
row of a data block, then to each column of the result. Because...
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Tài liệu A Concise Introduction to Data Compression- P6 pptx
Ngày tải lên :
14/12/2013, 15:15
... between pixels, 8, 22, 65
da Vinci, Leonardo (1452–1519), 178
data compression (approaches to), 21–58
data hiding (steganography), viii
data structures, ix, 81, 273
Daubechies, Ingrid (1954–), 199
decoder, ... nine bits. Since the uncoded data requires just two bits (01 or 10),
the compression ratio is 9/2=4.5 (the compressed data is 4.5 times bigger than the
original data; a significant expansion).
Please ... Statistical data compression methods work by assigning variable-
length codes to symbols in the data, with the shorter codes assigned to symbols or
groups of symbols that appear more often in the data...
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Tài liệu Statistical Description of Data part 9 pptx
Ngày tải lên :
15/12/2013, 04:15
... the values of the data. That means that we can do
all the fitting in advance, for fictitious data consisting of all zeros except for a single 1, and
then do the fits on the real data just by taking ... noisy data.
The premise of data smoothing is that one is measuring a variable that is both slowly
varying and also corrupted by random noise. Then it can sometimes be useful to replace
each data ... the FWHM of desired features
in the data. (References
[3]
and
[4]
give additional practical hints.)
Figure 14.8.2 shows the result of smoothing the same noisy data with broader
Savitzky-Golay...
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Tài liệu Modeling of Data part 1 pptx
Ngày tải lên :
15/12/2013, 04:15
... the data, then items (i) and (ii) are probably worthless.
Unfortunately, many practitioners of parameter estimation never proceed beyond
item (i). They deem a fit acceptable if a graph of data ... particular data set of x
i
’s and y
i
’s, we have the intuitive feeling that
some parameter sets a
1
a
M
are very unlikely — those for which the model
function y(x) looks nothing like the data — ... Chapters 18–19.
15.1 Least Squares as a Maximum Likelihood
Estimator
Suppose that we are fitting N data points (x
i
,y
i
)i=1, ,N, to a model that
has M adjustable parameters a
j
,j=1, ,M. The model...
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Tài liệu Modeling of Data part 4 pptx
Ngày tải lên :
15/12/2013, 04:15
... Calculate χ
2
.
*q=1.0;
if (mwt == 0) {
for (i=1;i<=ndata;i++)
*chi2 += SQR(y[i]-(*a)-(*b)*x[i]);
sigdat=sqrt((*chi2)/(ndata-2)); For unweighted data evaluate typ-
ical sig using chi2,andad-
just ... *= sigdat;
*sigb *= sigdat;
} else {
for (i=1;i<=ndata;i++)
*chi2 += SQR((y[i]-(*a)-(*b)*x[i])/sig[i]);
if (ndata>2) *q=gammq(0.5*(ndata-2),0.5*(*chi2)); Equation (15.2.12).
}
}
CITED REFERENCES ... P.R. 1969,
Data Reduction and Error Analysis for the Physical Sciences
(New York:
McGraw-Hill), Chapter 6.
15.3 Straight-Line Data with Errors in Both
Coordinates
If experimental data are subject...
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Tài liệu Modeling Of Data part 7 pptx
Ngày tải lên :
15/12/2013, 04:15
... the actual data set D
S
(0)
, with its N data points, to
generate any number of synthetic data sets D
S
(1)
,D
S
(2)
, , also with N data points.
The procedure is simply to draw N data points ... email to trade@cup.cam.ac.uk (outside North America).
synthetic
data set 1
synthetic
data set 2
synthetic
data set 3
synthetic
data set 4
a
2
χ
2
min
χ
2
min
(s)
a
1
(s)
a
3
(s)
a
4 ... email to trade@cup.cam.ac.uk (outside North America).
actual data set
hypothetical
data set
hypothetical
data set
hypothetical
data set
a
3
a
2
a
1
fitted
parameters
a
0
χ
2
min
true...
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Tài liệu Modeling Of Data part 8 pptx
Ngày tải lên :
15/12/2013, 04:15
... *arr,d,sum=0.0;
arr=vector(1,ndatat);
for (j=1;j<=ndatat;j++) arr[j]=yt[j]-b*xt[j];
if (ndatat & 1) {
aa=select((ndatat+1)>>1,ndatat,arr);
}
else {
j=ndatat >> 1;
aa=0.5*(select(j,ndatat,arr)+select(j+1,ndatat,arr));
}
abdevt=0.0;
for ... trade@cup.cam.ac.uk (outside North America).
*abdev=abdevt/ndata;
}
#include <math.h>
#include "nrutil.h"
#define EPS 1.0e-7
extern int ndatat; Defined in medfit.
extern float *xt,*yt,aa,abdevt;
float ... both important: either fractionally
small departures for all data points, or else fractionally large departures for a small
number of data points. It is the latter interpretation, leading to the...
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Tài liệu Data Preparation for Data Mining- P12 pptx
Ngày tải lên :
15/12/2013, 13:15
... needed
function in the training data set, the function improves its fit with the test data too. When
the function learned in the training data begins to fit the test data less well, training is ... density manifold stability.
But here is where data preparation steps into the data survey. The data survey
(Chapter 11) examines the data set as a whole from many different points of view. ... compress such data for modeling very effectively. Compression models of the
process require data from both normal and abnormal operations, as well as careful
automated monitoring of the data stream...
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Tài liệu Data Preparation for Data Mining- P13 pptx
Ngày tải lên :
15/12/2013, 13:15
... can be used to examine data as
instances, data as variables, the data set as a whole, and various parts of a data set.
Entropy and mutual information are used to evaluate data in many ways. Some ... cannot. Almost all real-world data sets
are noisy, so the example data sets used here comprise noisy data approximating the two
curves. Data set F (functional) contains the data for the curve that ... what the data “means” or predicts. The prepared data set still has to be
used. How is this data used? The last two chapters look not at preparing data, but at
surveying and using prepared data. ...
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