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³äá³ð ³ îáðîáêà ³íôîðìàö³¿, ¹21(97), 2004


ÀÍÎÒÀÖ²¯

ÏÎËß ÒÀ ÑÈÃÍÀËÈ Ó ÍÅÎÄÍÎвÄÍÈÕ ÑÅÐÅÄÎÂÈÙÀÕ

ÓÄÊ 621.372.8
Â. ². ̳ðîøíè÷åíêî, Â. Ì. Îñòðîóøêî
ÂÏËÈ ÊÎÍÒÀÊÒÓ ÑϲÐÀËÅÉ 3 ÒÎÐÖÅÌ ÐÅÇÎÍÀÒÎÐÀ ÍÀ ×ÀÑÒÎÒÈ ÂËÀÑÍÈÕ ÅËÅÊÒÐÎÌÀÃͲÒÍÈÕ ÊÎËÈÂÀÍÜ

The natural frequencies for cylindrical cavity with helices touching its end plates are calculated. The explicit expressions for the case of long cavity with helix contacting with both end plates and for the case of cavity with short helix contacting with one end plate are obtained. The numerical calculations are carried out for some set of dimensions of the one-helix structures and for the cavity with the both helices having close natural frequencies.

Ðîçðàõîâàíî âëàñí³ ÷àñòîòè öèë³íäðè÷íîrî ðåçîíàòîðà ç³ ñï³ðàëÿìè, ùî òîðêàþòüñÿ éîãî òîðö³â. Îòðèìàíî ÿâí³ âèðàçè äëÿ äîâãîãî ðåçîíàòîðà ç³ ñï³ðàëëþ, ùî òîðêàºòüñÿ îáîõ òîðö³â, òà äëÿ ðåçîíàòîðà ç êîðîòêîþ ñï³ðàëëþ, ùî òîðêàºòüñÿ îäíîãî òîðöÿ. Âèêîíàíî ÷èñëîâ³ ðîçðàõóíêè äëÿ ïåâíèõ ä³àïàçîí³â ðîçì³ð³â ðåçîíàòîð³â ç îäí³ºþ ñï³ðàëëþ òà ðåçîíàòîðà ç îáîìà ñï³ðàëÿìè çà íàÿâíîñò³ áëèçüêèõ âëàñíèõ ÷àñòîò.



ÌÀÒÅÌÀÒÈ×Ͳ ÌÎÄÅ˲ ÑÈÃÍÀ˲ ÒÀ ÑÈÑÒÅÌ

ÓÄÊ 621.314
². Þ. ²ñàºâ, ². Á. Êðàâåöü, ². Ì. ßâîðñüêèé
ÄÎ ÏÀÐÀÌÅÒÐÈ×ÍÎÃÎ ÌÎÄÅËÞÂÀÍÍß ÏÅвÎÄÈ×ÍÎ ÊÎÐÅËÜÎÂÀÍÈÕ ÂÈÏÀÄÊÎÂÈÕ ÏÐÎÖÅѲÂ

Paãametric modeling method of periodically correlated random processes based on their presentation ³n the form of stationary dependent random processes is examined in this paper. Parameter determination of autoregressive models of the latter is conducted by minimizing måàn-square error on the output of the prediction filter. 

Ðîçãëÿíóòî ìåòîä ïàðàìåòðè÷íîãî ìîäåëþâàííÿ ïåð³îäè÷íî íåñòàö³îíàðíèõ ïðîöåñ³â, ùî ãðóíòóºòüñÿ íà ¿õ ïîäàíí³ ÷åðåç ñòàö³îíàðíî çâ'ÿçàí³ âèïàäêîâ³ ïðîöåñè. Ïàðàìåòðè àâòîðåãðåñèâíèõ ìîäåëåé ñòàö³îíàðíèõ âèïàäêîâèõ ïðîöåñ³â âèçíà÷èëè øëÿõîì ì³í³ì³çàö³¿ ñåðåäíüîêâàäðàòè÷íî¿ ïîìèëêè íà âèõîä³ ïðîãíîçóþ÷îãî ô³ëüòðà.

ÓÄÊ 621.3.019:51.001.57
Î. Þ. Ëîçèíñüêèé, Ñ. Â. Ùåðáîâñüêèõ
ÂÈÇÍÀ×ÅÍÍß ÅÔÅÊÒÈÂÍί ϲÄÌÍÎÆÈÍÈ ÔÀÇÎÂÈÕ ÇÀÊÎͲ ÐÎÇÏÎIJËÓ ÄËß ÓÒÂÎÐÅÍÍß ÌÀÒÅÌÀÒÈ×ÍÈÕ ÌÎÄÅËÅÉ ÍÀIJÉÍÎÑÒ² ÐÅÌÎÍÒÎÂÀÍÈÕ ÎÁ'ªÊÒ²Â

The choice of phase-type distribution set using which it's succeeded most effectively to form reliability models of multi-component items is described. The choice is carried out going out, firstly, from providing of characteristics item components simplicity approximation, and secondly, going out from providing of item reliability model simplicity with initial properties saving.

Îïèñàíî âèá³ð ìíîæèíè ôàçîâèõ çàêîí³â ðîçïîä³ëó, çà ÿêîþ âäàºòüñÿ íàéåôåêòèâí³øå ôîðìóâàòè ìîäåë³ íàä³éíîñò³ áàãàòîåëåìåíòíèõ îá'ºêò³â. Âèá³ð çä³éñíþþòü, âèõîäÿ÷è, ïî-ïåðøå, ³ç çàáåçïå÷åííÿ ïðîñòîòè àïðîêñèìàö³¿ õàðàêòåðèñòèê åëåìåíò³â îá'ºêòà, òà ïî-äðóãå, ³ç çàáåçïå÷åííÿ ïðîñòîòè îòðèìàíèõ ìîäåëåé íàä³éíîñò³ îá'ºêò³â çà ìàêñèìàëüíîãî çáåðåæåííÿ âèõ³äíèõ âëàñòèâîñòåé.

À. Borys
REMARKS ON DEFINITIONS OF FORCED-RESPONSE STABILITY AND ATTRACTIVITI USED IN DESIGN OF RECURSIVE DIGITAL FILTERS

²n thi¾ paper we show that the definition of attractivity of an actual recursive digital filter can be derived from its forced-response stability, under the assumption that the attractivity property for the corresponding ideal filter is fulfilled. The statement holds for a class of input signals defined in the forced-response stability definition. The definitions of attractivity and forced-response stability are reformulated appropriately to take into account the effect of quantization (granularity).

ÓÄÊ 621.182
Â. Á. Äóäèêåâè÷, Ê. Â. Îâ÷èííèêîâ, Â. Þ. Ìàðóùàê, Ð. Â. Á³ëÿãà
ÀÍÀ˲ÒÈ×ÍÅ ÌÎÄÅËÞÂÀÍÍß ÒÅÏËÎÎÁ̲ÍÍί ÇÎÍÈ Â ÊÎÒÅËÜÍÈÕ ÓÑÒÀÍÎÂÊÀÕ

Analytical modelling of heat exchang zone of boiler plant is described. Common equation, which describe of dynamics of heat exchange process is received. Functions of way out parameters, as a solve of equations set with definite vector of control àrå plotted.

Ðîçãëÿíóòî àíàë³òè÷íå ìîäåëþâàííÿ òåïëîîáì³ííî¿ çîíè êîòåëüíî¿ óñòàíîâêè. Îòðèìàíî çàãàëüíå ð³âíÿííÿ, ùî îïèñóº äèíàì³êó òåïëîîáì³íó. Ïîáóäîâàíî ôóíêö³¿ âèõ³äíèõ ïàðàìåòð³â ó ÷àñ³, ÿê³ îòðèìàíî ÿê ðîçâ'ÿçîê ñèñòåìè ð³âíÿíü çà âèçíà÷åíîãî âåêòîðà êåðóâàíü.

ÓÄÊ 621.313.333
Î. Ì. Âàñ³ëåâñüêèé, Â. Î. Ïîäæàðåíêî, Â. Þ. Êó÷åðóê
ÌÅÒÎÄ ÔÓÍÊÖ²É ×ÓÒËÈÂÎÑÒ² ÄËß ÔÎÐÌÓÂÀÍÍß Ä²ÀÃÍÎÑÒÈ×ÍÈÕ ÎÇÍÀÊ ÒÅÕͲ×ÍÎÃÎ ÑÒÀÍÓ ÅËÅÊÒÐÎÌÅÕÀͲ×ÍÈÕ ÑÈÑÒÅÌ 

The method of sensitivity funetions formation of diagnostic attributes of electromechanical systems in a mode of self-retardation is described. It is received characteristics of sensitivity functions, the deviation characteristic of the moment of resistance, the inertia moment, the starting moment, and also characteristics of their relative deviation are received.

Ðîçãëÿíóòî ìåòîä ôóíêö³é ÷óòëèâîñò³ äëÿ ôîðìóâàííÿ ä³àãíîñòè÷íèõ îçíàê òåõí³÷íîrî ñòàíó åëåêòðîìåõàí³÷íèõ ñèñòåì. Îòðèìàíî õàðàêòåðèñòèêè ôóíêö³é ÷óòëèâîñò³, â³äõèëåííÿ õàðàêòåðèñòèê ìîìåíòó îïîðó, ìîìåíòó ³íåðö³¿ ïóñêîâîãî ìîìåíòó, à òàêîæ õàðàêòåðèñòèêè ïîõèáîê â³äíîñíîãî â³äõèëåííÿ.



ÎÁÐÎÁÊÀ ÂÈ̲ÐÞÂÀËÜÍί ²ÍÔÎÐÌÀÖ²¯

ÓÄÊ 621.317.42
Â. Î. ͳ÷îãà
ÐÎÇÂÈÒÎÊ ÄÎÑ˲ÄÆÅÍÜ Ç² ÑÒÂÎÐÅÍÍß ÂÈÑÎÊÎ×ÓÒËÈÂÈÕ ÄÀÂÀײ Ç̲ÍÍÈÕ ÌÀÃͲÒÍÈÕ ÏÎË²Â Ó Â²ÄIJ˲ ²ÄÁÎÐÓ ² ÎÁÐÎÁÊÈ ÑÒÎÕÀÑÒÈ×ÍÈÕ ÑÈÃÍÀË²Â Ó Ô²ÇÈÊÎ-ÌÅÕÀͲ×ÍÎÌÓ ²ÍÑÒÈÒÓÒ² ÍÀÍÓ

Ìà³n stages of formation and development of the PMI NANU investigations, devoted to elaborating high-performance sensors for measurement of weak alternating magnetic fields for ground-base and aerial prospecting, searching underground and underwater communication ñàbles, space researches and technical diagnostics of rails, are considered in the article.

Ïðîàíàë³çîâàíî îñíîâí³ åòàïè ñòàíîâëåííÿ òà ðîçâèòêó ó Ô̲ ÍÀÍÓ äîñë³äæåíü ç³ ñòâîðåííÿ âèñîêîåôåêòèâíèõ äàâà÷³â äëÿ âèì³ðþâàííÿ ñëàáêèõ çì³ííèõ ìàãí³òíèõ ïîë³â äëÿ íàçåìíî¿ òà àåðîåëåêòðîðîçâ³äêè, ï³äçåìíèõ ³ ï³äâîäíèõ êàáåë³â çâ'ÿçêó, êîñì³÷íèõ äîñë³äæåíü òà òåõí³÷íî¿ ä³àãíîñòèêè çàë³çíè÷íèõ ðåéîê.

ÓÄÊ 550.837.6:621.373
Ï. Ï. Äðàáè÷, Ï. Á. Äóá
ÁÅÇÊÎÍÒÀÊÒÍÅ ÂÈßÂËÅÍÍß ÄÅÔÅÊҲ ²ÇÎËßÖ²¯ ϲÄÇÅÌÍÈÕ ÑÒÐÓÌÎÏÐÎÂÎIJ ÍÀ ÎÑÍβ ÐÎÇÐÀÕÓÍÊÓ ÅËÅÊÒÐÎÌÀÃͲÒÍÎÃÎ ÏÎËß ÅËÅÊÒÐÈ×ÍÎÃÎ ÄÈÏÎËß

The formulae for investigation of over-ground changes of the components of the electromagnetic field of an underground electrical dipole are obtained. A possibility of detection of the underground current conductor insulation damages using measurement of alternating electromagnetic field is considered.

Îòðèìàíî ôîðìóëè äëÿ âèâ÷åííÿ çì³í íàä çåìíîþ ïîâåðõíåþ ñêëàäîâèõ åëåêòðîìàãí³òíîãî ïîëÿ ðîçòàøîâàíîãî ï³ä çåìëåþ åëåêòðè÷íîãî äèïîëÿ. Ðîçãëÿíóòî ìîæëèâ³ñòü âèÿâëåííÿ äåôåêò³â ³çîëÿö³¿ ï³äçåìíèõ ñòðóìîïðîâîä³â øëÿõîì âèì³ðþâàííÿ çì³ííîãî åëåêòðè÷íîãî ïîëÿ.

ÓÄÊ 621.372
Î. Â. Òèì÷åíêî, ². Â. Ãîðáàòèé
ÌÅÒÎÄ Ï²ÄÂÈÙÅÍÍß ØÂÈÄÊÎÑÒ² ÏÅÐÅÄÀÂÀÍÍß ÄÀÍÈÕ ×ÅÐÅÇ ÒÅËÅÊÎÌÓͲÊÀÖ²ÉÍÈÉ ÊÀÍÀË ØËßÕÎÌ ÓÄÎÑÊÎÍÀËÅÍÍß ÌÎÄÓËßÖ²¯ ÑÈÃÍÀËÓ

Method allows to transmit the greater amount data relatively with DPSK-4 and QAM-16 under such protection from additive noise and alike maximum amplitudes of modulating signal.

Ìåòîä äîçâîëÿº ïåðåäàâàòè á³ëüøó ê³ëüê³ñòü äàíèê ïîð³âíÿíî ç ÔÌ-4 òà ÊÀÌ-16 çà îäíàêîâî¿ ñò³éêîñò³ äî àäèòèâíèõ çàâàä òà îäíàêîâèõ ìàêñèìàëüíèõ àìïë³òóä ìîäóëþþ÷èõ ñèãíàë³â.



ÎÁÐÎÁÊÀ ÇÎÁÐÀÆÅÍÜ ÒÀ ÐÎÇϲÇÍÀÂÀÍÍß ÎÁÐÀDzÂ

ÓÄÊ 621.325
Ð. À. Âîðîáåëü, ². Ì. Æóðàâåëü
ÌÅÒÎÄ ÊÀ˲ÁÐÓÂÀÍÍß ÖÈÔÐÎÂÈÕ Â²ÄÅÎÊÀÌÅÐ ÍÀ ÎÑÍβ ÏÅÐÅÒÂÎÐÅÍÜ ÕÀÔÀ

Analysis of reasones of geometrical distortions in optical-electronical systems is conducted. A method of digital camera calibration using Hough transform. That assists an measurement accuracy increase is proposed.

Ïðîàíàë³çîâàíî ïðè÷èíè âèíèêíåííÿ ãåîìåòðè÷íèõ ñïîòâîðåíü â îïòèêî-åëåêòðîííèõ ñèñòåìàõ ôîðìóâàííÿ öèôðîâèõ çîáðàæåíü. Çàïðîïîíîâàíî ìåòîä êàë³áðóâàííÿ öèôðîâèõ êàìåð ç âèêîðèñòàííÿì ïåðåòâîðåíü Õàôà, ùî ñïðèÿº ï³äâèùåííþ òî÷íîñò³ âèì³ðþâàíü ïàðàìåòð³â îá’ºêò³â çà ¿õ çîáðàæåííÿìè.

ÓÄÊ 621.391
Ð. ß. Êîñàðåâè÷, Á. Ï. Ðóñèí
ÄÅÒÅÊÒÓÂÀÍÍß ÃÐÀÍÈÖÜ ÇÅÐÅÍ Ì²ÊÐÎÑÒÐÓÊÒÓÐÈ ÍÀ ÇÎÁÐÀÆÅÍÍßÕ ÏÎÂÅÐÕͲ ÌÀÒÅвÀËÓ ÇÀ ÄÎÏÎÌÎÃÎÞ ÏÎËß ÍÎÐÌÀËÅÉ

The problem of metalographic image analysis is considered. A new approach for image segmentation, based on investigation of common placement of surfaces normal vectors in local neighborhood, is proposed.

Ðîçãëÿíóòî ïðîáëåìó àíàë³çó ìåòàëîãðàô³÷íèõ çîáðàæåíü. Òðàêòóþ÷è çîáðàæåííÿ ÿê ãëàäêèé ìíîãîâèä, çàïðîïîíóâàëè íîâèé ï³äõ³ä äëÿ ëîêàëüíî¿ êëàñèô³êàö³¿ éîãî òî÷îê, ùî áàçóºòüñÿ íà äîñë³äæåíí³ âçàºìíîãî ðîçòàøóâàííÿ âåêòîð³â íîðìàëåé ìíîãîâèäó â îêîë³ òî÷êè. Íà îñíîâ³ öüîãî ï³äõîäó ðîçâèíóòî ìåòîä ñåãìåíòàö³¿ çîáðàæåíü.

ÓÄÊ 551.568.85
Î. Â. Êàïø³é
ÑÒÂÎÐÅÍÍß ËÎÊÀËÜÍί ÏÐÈÕÎÂÀÍί ÌÀÐʲÂÑÜÊί ÌÎÄÅ˲ 3 ÃÅÎÌÅÒÐÈ×ÍÈÌ ÊÎÍÒÅÊÑÒÎÌ ÄËß Ô²ËÜÒÐÀÖ²¯ ÇÎÁÐÀÆÅÍÜ Ó ÂÅÉÂËÅÒ-ÏÐÎÑÒÎв

A denoising algorithm for images corrupted by additive white gaussian noise is proposed. Òhe algorithm is based on modeling each wavelet element by lîñàl hidden markov chain with geometrical context. The algorithm has shown good denoising performance in comparison with other state-of-the-art denoising algorithms.

Çàïðîïîíîâàíî àëãîðèòì ô³ëüòðàö³¿ çîáðàæåíü, ñïîòâîðåíèõ àäèòèâíèì á³ëèì ãàóñ³âñüêèì øóìîì ç íóëüîâèì ñåðåäí³ì. Àëãîðèòì ãðóíòóºòüñÿ íà ìîäåëþâàíí³ çíà÷åííÿ êîæíîãî åëåìåíòà âåéâëåò-ïåðåòâîðåííÿ çîáðàæåííÿ ëîêàëüíèì ïðèõîâàíèì ìàðê³âñüêèì ëàíöþãîì ç ãåîìåòðè÷íèì êîíòåêñòîì. Ïîêàçàíî, ùî àëãîðèòì ìຠêðàù³ âëàñòèâîñò³ ô³ëüòðàö³¿ ïîð³âíÿíî ç ³íøèìè ìåòîäàìè.

ÓÄÊ 532.61:681.327.12.001.33
Î. Â. Ëè÷àê, Ç. Â. Ãëîâà, À. Á. Êìåòü
ÑÏÅÊÒÐÀËÜͲ ÏÅÐÅÒÂÎÐÅÍÍß ÑÈÃÍÀË²Â Ó Ð²ÇÍÈÖÅÂÎÌÓ ÑÏÅÊË-²ÍÒÅÐÔÅÐÎÌÅÒв ˲ÍÄÅÐÖß

The analysis of the amplitude and frequency transformations in the differential electronic spekle interferometer based on Linderec scheme was performed. Optimal scheme for demodulation of the information component was substantiated. The exact expression for signal to noise ratio with involving of spekle displacement and incoherency of subject and reference beams was obtained.

Ïðîàíàë³çîâàíî ïåðåòâîðåííÿ àìïë³òóä òà ÷àñòîò ñèãíàë³â ó ð³çíèöåâîìó åëåêòðîííîìó ñïåêë- ³íòåðôåðîìåòð³ ˳íäåðöÿ. Îáãðóíòîâàíî âèá³ð ñõåìè äåìîäóëÿö³¿ ³íôîðìàö³éíîãî ñèãíàëó. Îòðèìàíî òî÷íèé âèðàç äëÿ ñï³ââ³äíîøåííÿ ñèãíàë/øóì ³ç óðàõóâàííÿì ïåðåì³ùåííÿ ñïåêëà òà íåêîãåðåíòíîñò³ îïîðíîãî ³ ïðåäìåòíîãî ïðîìåí³â.

ÓÄÊ 535.8:535.241.13
Ì. Î. Ìåëüíèê
ÑÈÃÍÀËÜͲ ÒÀ ØÓÌβ ÃÎËÎÃÐÀÔ²×Ͳ ÕÀÐÀÊÒÅÐÈÑÒÈ ÏÐÎÑÒÎÐÎÂÎ-×ÀÑÎÂÈÕ ÌÎÄÓËßÒÎв Ñ²ÒËÀ

It is offered to use a method of signal and noise fields for research of characteristics of spatial-temporal light modulators. The method allows to choose and expect schemes of holographic record and modes of reconstruction, and also to avoid distortions and noises connected to the nonlinearity of transmission of an objective field amplitude. The correctness of the method is åõðårimentally confirmed on the PRIZ modulators.

Çàïðîïîíîâàíî âèêîðèñòîâóâàòè ìåòîä ñèãíàëüíèõ ³ øóìîâèõ ïîë³â äëÿ äîñë³äæåííÿ õàðàêòåðèñòèê ïðîñòîðîâî-÷àñîâèõ ìîäóëÿòîð³â ñâ³òëà. ³í äîçâîëÿº âèáèðàòè ³ ðîçðàõîâóâàòè ñõåìè ãîëîãðàô³÷íîãî çàïèñó ³ ðåæèìè â³äòâîðåííÿ, à òàêîæ óíèêíóòè ñïîòâîðåíü òà øóì³â, ïîâ'ÿçàíèõ ç íåë³í³éí³ñòþ ïåðåäà÷³ àìïë³òóäè îá'ºêòíîãî ïîëÿ. Êîðåêòí³ñòü ìåòîäó åêñïåðèìåíòàëüíî ï³äòâåðäæåíà íà ìîäóëÿòîðàõ ÏÐÈÇ.

ÓÄÊ 519.9:612.8:621.391
Ð. Ì. Êàì³íñüêèé
ÎÖ²ÍÞÂÀÍÍß ÔÓÍÊÖ²ÎÍÀËÜÍί ÅÔÅÊÒÈÂÍÎÑÒ² ËÞÄÈÍÎ-ÌÀØÈÍÍÎÃÎ ²ÍÒÅÐÔÅÉÑÓ ÎÁÐÎÁÊÈ Â²ÇÓÀËÜÍί ²ÍÔÎÐÌÀÖ²¯

The pattern recognition complexity characteristic is proposed. The criteria of funetional efficiency estimation for man machine interface of visual information recognition and its working up by it is developped.

Çàïðîïîíîâàíî ïîêàçíèê ðîçï³çíàâàëüíî¿ ñêëàäíîñò³ çîáðàæåíü ³ íà éîãî îñíîâ³ ðîçðîáëåíî êðèòåð³é ôóíêö³îíàëüíî¿ åôåêòèâíîñò³ ðîáîòè ëþäèíî-ìàøèííîãî ³íòåðôåéñó îáðîáêè ³ ðîçï³çíàâàííÿ â³çóaëüíî¿ ³íôîðìàö³¿.



ÀËÃÎÐÈÒ̲×ÍÅ ÒÀ ÏÐÎÃÐÀÌÍÅ ÇÀÁÅÇÏÅ×ÅÍÍß

ÓÄÊ 621.513.8
Â. Ñ. Ñòåïàøêî, Ñ. Ì. ªô³ìåíêî
ÀÍÀË²Ç ÎÑÎÁËÈÂÎÑÒÅÉ ÐÅÊÓÐÅÍÒÍÎÃÎ ÌÅÒÎÄÓ ÏÎÑ˲ÄÎÂÍÎÃÎ ÎÖ²ÍÞÂÀÍÍß ÏÀÐÀÌÅÒв ÌÎÄÅËÅÉ

Some useful peculiarities of a recurrent method for consequent estimation of model parameters are considered; comparative effectiveness of its use in problems of structural-parameter identification is shown.

Ðîçãëÿíóòî äåÿê³ êîðèñí³ îñîáëèâîñò³ ðåêóðåíòíîãî ìåòîäó ïîñë³äîâíîãî îö³íþâàííÿ ïàðàìåòð³â ìîäåëåé òà ïîêàçàíî ïîð³âíÿëüíó åôåêòèâí³ñòü éîãî çàñòîñóâàííÿ â çàäà÷àõ ñòðóêòóðíî-ïàðàìåòðè÷íî¿ ³äåíòèô³êàö³¿.

ÓÄÊ 519.68
Ã. Ã. Öåråëèê, Ð. Î. Òè÷êîâñüêèé
ÌÎÄÅËÞÂÀÍÍß ÎÏÒÈÌÀËÜÍÎÃÎ ÄÎÑÒÓÏÓ ÄÎ ²ÍÔÎÐÌÀÖ²¯ ÑÅÐÂÅÐ²Â Ç ÁÎÊÓ ÊÎÐÈÑÒÓÂÀײÂ

In this paper the approach to modeling of the optimal users access to the information of remote servers is proposed. The explicit expression of the mathematical expectation of general time, which is necessary for searching of page, is found. It is done as in the case of uniform distribution probability of address to the pages such in the case of different laws of non-uniform distribution. The meaning of control parameters, where the mathematical expectation reach the minimum, is found.

Ðîçãëÿíóòî ï³äõ³ä äî ìîäåëþâàííÿ îïòèìàëüíîãî äîñòóïó êîðèñòóâà÷³â äî ³íôîðìàö³¿ â³ääàëåíèõ ñåðâåð³â. Çíàéäåíî ÿâíèé âèðàç äëÿ ìàòåìàòè÷íîãî ñïîä³âàííÿ çàãàëüíîãî ÷àñó, íåîáõ³äíîãî äëÿ ïîøóêó ñòîð³íêè, ÿê äëÿ ð³âíîì³ðíîãî ðîçïîä³ëó éìîâ³ðíîñòåé çâåðòàííÿ äî ñòîð³íîê, òàê ³ äëÿ ð³çíèõ çàêîí³â íåð³âíîì³ðíîãî ðîçïîä³ëó. Ðîçðàõîâàíî çíà÷åííÿ ïàðàìåòð³â êåðóâàííÿ, çà ÿêèõ ìàòåìàòè÷íå ñïîä³âàííÿ äîñÿãຠì³í³ìóìó.

ÓÄÊ 004.032.26
Â. Ì. Ìàíäç³é
ÐÎÇÐÎÁÊÀ ÍÎÂί ÌÎÄÈÔ²ÊÀÖ²¯ ÍÅÉÐÎÌÅÐÅƲ ÃÎÏÔ²ËÄÀ ÄËß ÍÅÊÎÐÅËÜÎÂÀÍÈÕ ÇÎÁÐÀÆÅÍÜ

In the paper new modification of classical Hopfield's neuronet is considered which have a big noiseproof and capacity ³n comparison with another modifications.

Ðîçðîáëåíî íîâó ìîäèô³êàö³þ íåéðîìåðåæ³ Ãîïô³ëäà, ÿêà ïîð³âíÿíî ç ³íøèìè øâèäêî íàâ÷àºòüñÿ, ìຠâåëèêó çàâàäîñò³éê³ñòü òà ºìí³ñòü.

ÓÄÊ 004.89
Ä. Ã. Äîñèí, Ð. Ð. Äàðåâè÷
ÌÅÒÎÄ ÂÈÇÍÀ×ÅÍÍß ÏÎIJÁÍÎÑÒ² ÒÅÊÑÒ²Â, ÏÎÄÀÍÈÕ Ó ÂÈÃËßIJ ÇÂÀÆÅÍÈÕ ÊÎÍÖÅÏÒÓÀËÜÍÈÕ ÃÐÀÔ²Â

The new method of text documents comparison by a content is proposed. The method is based on text representation as a conceptual graph and on assigning to it's nodes and arcs certain weight coefficients, proportional to occurrence frequency of correspondent terms and keyword word-combinations for the given knowledge domain. Comparison of different methods of estimation of texts similarity în testing examples is presented.

Çàïðîïîíîâàíî íîâèé ìåòîä ïîð³âíÿííÿ òåêñòîâèõ äîêóìåíò³â çà çì³ñòîì, ÿêèé áàçóºòüñÿ íà ïîäàíí³ òåêñò³â ó âèãëÿä³ êîíöåïòóàëüíèõ ãðàô³â òà ïðèñâîºíí³ âåðøèíàì òà ðåáðàì òàêèõ ãðàô³â ïåâíèõ âàãîâèõ êîåô³ö³ºíò³â, ïðèéíÿòèõ ïðîïîðö³éíèìè äî ÷àñòîòè çóñòð³÷àííÿ â³äïîâ³äíèõ ¿ì òåðì³í³â òà ñëîâîñïîëó÷åíü ó äàí³é ïðåäìåòí³é îáëàñò³. Ïîð³âíÿíî ð³çí³ ìåòîäè îö³íêè ïîä³áíîñò³ íà òåñòîâèõ ïðèêëàäàõ.

ÓÄÊ 519.6
Ê. Â. Ñóùèê
ÁÀËÀÍÑͲ ÍÀÁËÈÆÅÍÍß ×ÅÁÈØÎÂÑÜÊÈÌÈ ÑÏËÀÉÍÀÌÈ ÍÀ ÁÅÇÌÅÆÍÎÌÓ ²ÍÒÅÐÂÀ˲

At the paper an approximation of function f(õ) on the interval ³s considered. Algorithm of function approximation by Chebyshev spline on the infinite interval is proposed. The distinctive feature of the algorithm is the use of different expressions on the finite and infinite links of spline.

Ðîçãëÿíóòî íàáëèæåííÿ ôóíêö³¿ f(õ) íà ïðîì³æêó. Çàïðîïîíîâàíî àëãîðèòì íàáëèæåííÿ ôóíêö³¿ ÷åáèøîâñüêèì ñïëàéíîì íà áåçìåæíîìó ³íòåðâaë³. Îñîáëèâ³ñòþ öüîãî aëãîðèòìó º âèêîðèñòàííÿ ð³çíèõ âèðàç³â íà ëàíêàõ, ùî ìàþòü ñê³í÷åííó òà íåñê³í÷åííó äîâæèíè.

ÓÄÊ 681.142.37
Ð.Ì. Êîãyò, Î.Ì. Ïàâëþê
ÁÓËÅÂÈÉ ÍÅÉÐÎÍ

In the paper the new type of elementary neuron element, called Boolean neuron, is presented. On the base of Boolean neuron the algorithms of training and using of a Boolean neural network are developed. The example of Boolean function reproduction by suggested Boolean neural network was presented.

Ïðåäñòàâëåíî íîâèé òèï åëåìåíòàðíîãî íåéðîííîãî åëåìåíòà — áóëåâèé íåéðîí, íà îñíîâ³ ÿêîãî ðîçðîáëåíî àëãîðèòìè íàâ÷àííÿ òà ôóíêö³îíóâàííÿ áóëåâî¿ íåéðîííî¿ ìåðåæ³. Íàâåäåíî ïðèêëàä â³äòâîðåííÿ áóëåâî¿ ôóíêö³¿ çà äîïîìîãîþ çàïðîïîíîâàíî¿ íåéðîííî¿ ìåðåæ³. 


Ïîíîâëåíî:9.03.2005