.


:




:

































 

 

 

 


15. (Java, Perl, HTML, XML). web- web- (PHP, ASP NET, Delphi). web-.




́ ́ ́ ́ (. scripting language, ) . . , .

, Tcl, (. system programming languages) (. scripting languages). (. glue languages) (. system integration languages). , , JIT-.

.

JavaScript

JavaScript - Netscape, ECMAScript.

JavaScript JavaScript, Web-. JavaScript . , ActionScript, , Macromedia Flash 5 MX, ECMAScript.

JavaScript Netscape Mozilla (http://www.mozilla.org/js/). Mozilla JavaScript - "SpiderMonkey" ( ) "Rhino" ( Java).

Perl , -. , Perl , "Practical Extraction and Report Language" ( ).

, (regular expressions). CPAN, http://www.cpan.org/.

eXtensible Markup Language (XML, ) , HTML, , (XML-), .

HTML (Hypertext Markup Language) - .

(hypertext) - , , .

- ( : , , ) , (, Web-).

- .

HTML () , (, , , ..).

HTML , .

Web- Web-

, Internet, (Web-), . Web-. () Internet. Web- - , , Web- (). Web- , . InternetExplorer NetscapeNavigator. , () " ", .

Web- Web-. Web- *.htm, - HTML-, . , - Web- *.gif, *.jpg (), *.mid, *.mp3 (), *.avi (). HTML- (. 1.1).

Web- HTML (HyperText Mark-up Language - ), HTML- HTML-.

Web- DreameWeaver, NetscapeComposer, HotDog, Word97 , MicrosoftFrontPage, .

: (AdobePhotoshop, Fireworks, PaintShopPro, Painter .) , , .

PHP (. PHP: Hypertext Preprocessor PHP: ; Personal Home Page Tools[3] -) , -. - , -.

. .

PHP ( JSP, Perl , ASP.NET) , , , PHP.

- -. :

POST GET-, - ;

(MySQL, MySQLi, SQLite, PostgreSQL, Oracle (OCI8), Oracle, Microsoft SQL Server, Sybase, ODBC, mSQL, IBM DB2, Cloudscape Apache Derby, Informix, Ovrimos SQL, Lotus Notes, DB++, DBM, dBase, DBX, FrontBase, FilePro, Ingres II, SESAM, Firebird / InterBase, Paradox File Access, MaxDB, PDO);

HTTP-;

HTTP-;

cookies ;

, ;

, ;

XForms.

Delphi (́, /ˈdɛlˌfi:/[1]) , , - , Object Pascal[2]. Delphi 7.0, Borland Delphi Object Pascal. 2007 Delphi ( Object Pascal) , (, .NET) : class helpers, .

ASP.NET - - . Microsoft.NET Microsoft ASP. ASP.NET 4.5.

ASP.NET, , .NET Framework (C#, Visual Basic.NET JScript.NET). ASP.NET , , , , , . .

Web-

Web-.

. . , , , , HTML.

. . HTML, CSS Flash , . Web-, , , .

. Web- HTML CSS , , . , , JavaScript, , Java-, PHP-.

. Internet .

. , , , , Web-. , . , , Web- , . , Internet-. , , Web-, .

 

.16. . , , . Access, Oracle, MySQL, Foxpro, dBase, SQLServer. SQL SQL-.

́ ́ ́ ́ () , [1].

MicrosoftAccess Microsoft. , , . VBA, Access , .

Oracle Database 10g , . Oracle Database 10g , . - - (OLAP).

MySQL . MySQL . MySQL , , , MySQL .

MySQL : MyISAM, , InnoDB, ..

SQL , , - , , , . SQL

, SQL : ; ; ; ; ( ); .

, SQL , (, , , ) , .

, SQL . , , , , , , .

SQL , , . , , : ( ); ; () ; .

, SQL- . ,

, ( );

, ( ) .

, , , , , . , ; ; .

, () , : ; ; .

, SQL , , , .

 

17. . . . . . - .

:

;

;

;

;

;

;

.

( , ..).

. .

:

, ( );

( ) ;

( , , );

;

() ;

(, , , ..) .

. , . .

. , ; , ; . .

, , .

, , , .

, .

.

, , , .

, ( ), , . : , , ..

, . , .

, (). / () .

- , , . , .

, , .

- ( ), . - ( ) () . , , , , . .

- . . . () - , - . : r- , - N=i, 2,... b1b2... bl r= {0, 1,..., r-1} , b1 0 b1 rl -1+...+ bl -1r+bl=N; , ; , (. .). 2= {0, 1} 9, 1 (., 5 110010011). . . , , . (

), , . , . , . ., . , , . . . (. Shannon, [1]) . , , . , - . f () * () :

i=1, 2,..., k. f: . . . , , - ( ,) . , . - , : (. ). , , :

1) , 2) , . . , - , 3) ( ).

r. . . , f: ( ) , li=l,if) f(i):

: (l0,..., lm -1)- , (1), , f(i) li;. , li , f(i) li r- ( ).

. . . L(f) , i = { 0, ..., Pm-1). L(f):

, i - , - i - . , t ( ), . li i. f: * ->*r, L(f), L(f) (l0,..., 1 -1) , (1). . L(f) (l0,..., lm-1) ( ) Lr (P) (l0 () ,...,l -1 ()). I(f) = L (f) - Lr (P)., I(f) /L (f)- f. I(f)<1. , , , , Lr (P)

, r, a li (P)=- logrpi. I(f) = L (f)- r (P) < 1 . k, - k( ) . 1/ k. . , li , - , . , , - ( ), .

...

. ., - (, ) , .

- {f(0),..., f(m-1)}, r, , o . I(f)= -logrm (f)= - . ( ) . , r. ., 0 1, - 1 0. , f, , f-1 r - . , D0,..., Dm-1 , f-1 , f-1 (Di) =i, , f(i) Di, i=0,..., -1. , ( ), b=1,..., r-1, i=0, 1,... ( ), . .

(. ) , . ij i j. ( )

(q0,..., qm-1), f R(f), - (f) ( . nr Di). ( ) , R, >0 , -,

- (f)<e.

(. , , ) , t. Ei (t)- , f(i) t .

Ei (t), i=0,..., m-1, , , Ei (t) Di, , , . t. (., , . , ) d(, ), , , Ei (t)- t. (. . ) nr t t. , d(f(0) ,f (8))=1 d(f(5), f (8)) = 2, 3.

Ir (n, t)- t . , t,

"" , t. Ir (n, t) >2, r=2 (., ., ) (1978). , t= [ pn ], - , 0<<(r-1)/2r, ""

Tr (p) =-p logr (p/ (r- 1))-(1-)logr(l- p), . ,

, , . . Ir (, [ ]) ~ r (2). - .

, . , , ( ). , . ., n2, - , , (. (2)). . . . . . - , (. [5]).

, (., (3)) "", { } , { } , - , l , l(., llog l).

- , , , . ; re- ; (1) . .

 


 

.18. . , . .


 





:


: 2017-02-25; !; : 3690 |


:

:

, , .
==> ...

1015 - | 773 -


© 2015-2024 lektsii.org - -

: 0.08 .