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Showing 1 to 20 of 56 for “"Επιστήμη Ηλεκτρολόγου Μηχανικού, Ηλεκτρονικού Μηχανικού, Μηχανικού Η/Υ"”.
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ΒΕΛΤΙΣΤΟΠΟΙΗΣΗ ΣΥΡΜΑΤΙΝΩΝ ΚΕΡΑΙΩΝ ΜΕΣΑ ΣΤΟ ΦΥΣΙΚΟ ΤΟΥΣ ΠΕΡΙΒΑΛΛΟΝ
THE OPTIMIZATION OF TOTALLY ARBITRARY WIRE ANTENNAS IS EXAMINED WITH NON PREDETERMINED POLARIZATION, AT DIAL FREQUENCY OPERATION AND WITH DIFFRACTION EFFECTS INCLUDED. IN THIS WAY THE RESULT IS AN INCREASED ENVIRONMENTAL APPROXIMATIONOF ANTENNAS.
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ΥΠΟΛΟΓΙΣΜΟΣ ΔΥΝΑΜΙΚΩΝ ΚΑΤΑΣΤΑΣΕΩΝ ΔΙΚΤΥΩΝ ΜΕ ΤΟ ΦΑΣΙΚΟ ΜΟΝΤΕΛΟ ΤΗΣ ΣΥΓΧΡΟΝΟΥ ΜΗΧΑΝΗΣ
THE PROBLEM OF DYNAMIC OVERVOLTAGES IS APPROACHED USING A FULL MACHINE MODEL AND LUMPED PARAMETERS LINE IN PHASE COORDINATES. IT IS SHOWN HOW IMPLICIT INTEGRATION SEQUENCES IMPLEMENTED IN A SUBSTITUTION MODE CAN BE APPLIED IN THIS AREA. RESULTS OF ANALYTICAL STUDIES ARE PRESENTED AND THE ADVANTAGES …
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ΔΡΟΜΟΛΟΓΗΣΗ ΜΗΝΥΜΑΤΩΝ ΣΕ ΔΙΚΤΥΟ ΥΠΟΛΟΓΙΣΤΩΝ ΒΑΣΕΙ ΤΗΣ ΜΕΘΟΔΟΥ ΜΕΙΩΣΗΣ ΜΕΤΑΒΛΗΤΩΝ
THE ROUTING PROBLEM IN PACKET-SWITCHED DISTRIBUTED-CONTROL COMPUTER NETWORKS ISCONSIDERED. THE MINIMISATION OF MEAN TIME DELAY OF PACKETS IS ATTAINED. LAGRANGE MULTIPLIERS METHOD IS STUDIED AND THE PROBLEMS ASSOCIATED WITH IT ARE EXAMINED. FURTHERMORE IT IS SHOWN THAT: 1) THE HESSIAN MATRIX OF THE …
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ΑΝΑΓΩΓΗ ΠΡΟΒΛΗΜΑΤΩΝ ΛΩΡΙΔΑΣ ΜΕ Η ΧΩΡΙΣ ΕΝΙΣΧΥΣΕΙΣ, ΣΕ ΕΠΙΛΥΣΗ ΙΔΙΟΜΟΡΦΩΝ ΟΛΟΚΛΗΡΩΤΙΚΩΝ ΕΞΙΣΩΣΕΩΝ
WE FIND THE STRESS INTENSITY FACTOR FOR A CRACKED STRIP WITH A HOLE AND ALSO THE STRESS CONCENTRATIONS. WE FACE THE PROBLEM OF A DISLOCATION IN TWO STRIPS WHICH ARE MADE FROM DIFFERENT MATERIALS . WE SOLVE ALSO THE PROBLEM OF A DISLOCATION IN A STRIP WITH STIFFNERS FROM BOTH SIDES WHICH ARE MADE …
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ΣΧΕΔΙΑΣΗ ΔΙΣΔΙΑΣΤΑΤΩΝ ΨΗΦΙΑΚΩΝ ΦΙΛΤΡΩΝ ΑΠΕΙΡΗΣ ΚΡΟΥΣΤΙΚΗΣ ΑΠΟΚΡΙΣΗΣ ΜΕ ΝΕΕΣ ΜΕΘΟΔΟΥΣ ΒΕΛΤΙΣΤΟΠΟΙΗΣΗΣ
THIS PAPER REFERS TO THE DESIGN OF 2-D INFINITE IMPULSE RESPONSE DIGITAL FILTERS WITH LINEAR AND NON-LINEAR TECHNIQUES. THREE METHODS ARE PROPOSED FOR THE DESIGN OF DIGITAL FILTER. TWO OF THEM ARE BASED ON THE FORMULATION OF A LINEAR PROGRAMMING PROBLEM AND THE THIRD ONE USES NONLINEAR INTEGER …
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ΑΛΓΟΡΙΘΜΟΙ ΔΙΑΜΕΛΙΣΜΟΥ ΓΡΑΜΜΙΚΗΣ ΕΚΤΙΜΗΣΗΣ-ΣΥΓΚΡΙΤΙΚΗ ΥΠΟΛΟΓΙΣΤΙΚΗ ΑΝΑΛΥΣΗ
THIS THESIS IS DEALING WITH LINEAR ESTIMATION PARTITIONING ALGORITHMS, FOR DISCRETE TIME SYSTEMS. FOUR NEW RECURSIVE PER- SAMPLE PARTITIONING ESTIMATION ALGORITHMS ARE INITIALY PRESENTED, AND THE RELATED MERITS, WITH RESPECT TO THEIR COMPUTATIONAL REQUIREMENTS ARE EXAMINED AGAINST THREE OTHER …
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ΝΕΑ ΜΕΘΟΔΟΣ ΑΥΤΟΜΑΤΗΣ ΑΝΑΓΝΩΡΙΣΗΣ ΟΜΙΛΗΤΗ
THE THESIS PRESENTS A NEW METHOD FOR AN AUTOMATIC SPEAKER RECOGNITION SYSTEM, WHICH COULD BE FAVORABLY IMPLEMENTED FOR IDENTIFICATION AS WELL AS FOR VERIFICATION PURPOSES. THIS METHOD IS BASED ON A SUBSTANTIALLY REDUCED NUMBER OF ELEMENTS OF THE PATTERN VECTOR IN COMPARISON TO SIMILAR METHODS. THE …
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ΔΙΑΔΟΣΗ ΤΗΣ ΑΚΤΙΝΟΒΟΛΙΑΣ - Γ ΠΟΥ ΕΚΠΕΜΠΕΤΑΙ ΑΠΟ ΔΙΣΚΟΕΙΔΗ ΠΗΓΗ, ΜΕ ΕΝΕΡΓΕΙΕΣ 1.37, 1.43 ΚΑΙ 2.75 MEV, ΜΕΣΑ ΣΕ ΠΛΑΚΕΣ ΓΡΑΦΙΤΗ, ΑΛΟΥΜΙΝΙΟΥ, ΣΙΔΗΡΟΥ ΚΑΙ...
Η ΔΙΑΤΡΙΒΗ ΑΣΧΟΛΕΙΤΑΙ ΜΕ ΤΗ ΔΙΑΔΟΣΗ ΤΗΣ ΑΚΤΙΝΟΒΟΛΙΑΣ-Γ ΜΕΣΑ ΣΕ ΓΡΑΦΙΤΗ, ΑΛΟΥΜΙΝΙΟ, ΣΙΔΗΡΟ ΚΑΙ ΜΟΛΥΒΔΟ. ΟΙ ΑΚΤΙΝΕΣ-Γ ΕΚΠΕΜΠΟΝΤΑΙ ΑΠΟ ΔΙΣΚΟΕΙΔΗ ΠΗΓΗ ΚΑΙ ΤΑ ΡΑΔΙΟΙΣΟΤΟΠΑ ΠΟΥ ΕΞΕΤΑΖΟΝΤΑΙ ΕΙΝΑΙ ΤΟ ΝΑ-24 ΚΑΙ ΤΟ V-52. ΥΠΟΛΟΓΙΖΟΝΤΑΙ ΠΕΙΡΑΜΑΤΙΚΑ ΤΑ ΦΑΣΜΑΤΑ ΤΗΣ ΓΩΝΙΑΚΗΣ ΚΑΤΑΝΟΜΗΣ ΤΗΣ ΡΟΗΣ ΦΩΤΟΝΙΩΝ, ΕΝΩ ΤΑ …
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ΠΑΡΑΛΛΗΛΟΙ ΑΛΓΟΡΙΘΜΟΙ ΣΧΕΔΙΑΣΜΟΥ ΤΡΟΧΙΑΣ ΡΟΜΠΟΤΙΚΩΝ ΒΡΑΧΙΟΝΩΝ ΚΑΙ ΑΠΟΣΥΖΕΥΞΗ ΜΗΓΡΑΜΜΙΚΩΝ ΣΥΣΤΗΜΑΤΩΝ
THE PH.D THESIS EXAMINES THE TRAJECTORY PLANNING PROBLEM IN ROBOTICS APPLICATION. THE CASE OF CONTINUOUS TRAJECTORY PLANNING IS CONSIDERED FOR ONE AND TWO COOPERATING MANIPULATORS RESPECTIVELY. THIS PROBLEM IS REDUCED TO A MAXIMIZING PROBLEM UNDER A SET OF CONSTRAINTS. TWO APPROACHES ARE PRESENTED …
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ΜΕΛΕΤΗ ΤΗΣ ΥΠΟΛΟΓΙΣΤΙΚΗΣ ΠΟΛΥΠΛΟΚΟΤΗΤΑΣ ΑΛΓΟΡΙΘΜΩΝ ΤΗΣ ΨΗΦΙΑΚΗΣ ΕΠΕΞΕΡΓΑΣΙΑΣ ΠΟΛΥΔΙΑΣΤΑΤΩΝ ΣΗΜΑΤΩΝ
THE PH.D. DISSERTATION DEALS WITH THE DEVELOPMENT OF NEW ALGORITHMS FOR DIGITAL SIGNAL PROCESSING, HAVING GOOD COMPUTATIONAL COMPLEXITY CHARACTERISTICS, SMALL MEMORY REQUIREMENTS AND SMALL COMPUTATION ERRORS. NEW IN-PLACE DFT ALGORITHMS ARE DEVELOPED. SOME NEW MULTIDIMENSIONAL DFT ALGORITHMS HAVING …
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ΒΕΛΤΙΣΤΗ ΔΙΕΚΠΕΡΑΙΩΣΗ ΤΗΣ ΚΙΝΗΣΕΩΣ ΣΕ ΤΗΛΕΠΙΚΟΙΝΩΝΙΑΚΑ ΔΙΚΤΥΑ ΜΕΤΑΓΩΓΗΣ ΚΥΚΛΩΜΑΤΩΝ
DYNAMIC TRAFFIC MANAGEMENT CONSISTS IN ALLOCATING THE EXISTING NETWORK'S CHANNEL CAPACITY ACCORDING TO THE VARYING TRAFFIC OF THE WHOLE NETWORK. THIS DISSERTATION PRESENTS MODELS FOR TWO DIFFERENT NETWORK ARCHITECTURES WHICH LEAD TO OPTIMAL USE OF THE CHANNEL CAPACITY UNDER REALISTIC CONSTRAINTS …
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ΕΦΑΡΜΟΓΗ ΑΜΕΣΩΝ ΜΕΘΟΔΩΝ ΤΗΣ ΣΥΝΑΡΤΗΣΙΑΚΗΣ ΑΝΑΛΥΣΕΩΣ ΣΤΟΝ ΥΠΟΛΟΓΙΣΜΟ ΑΝΤΙΣΤΑΣΕΩΝ, ΑΥΤΕΠΑΓΩΓΩΝ ΚΑΙ ΧΩΡΗΤΙΚΟΤΗΤΩΝ
THE ABOVE THESIS IS DEALT WITH THE APPLICATION OF DIRECT VARIATIONAL METHODS (E.G. RAYLEIGH-RITZ METHOD, GALERKIN METHOD, KANTOROVICH METHOD) FOR THE CALCULATION OF RESISTANCE, INDUCTANCE AND CAPACITANCE. THE ESTIMATION OF INTERNAL INDUCTANCE OF HIGHLY PERMEABLE CONDUCTORS (M>>M) WITH VAROUS …
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ΑΝΑΛΥΣΗ ΚΑΙ ΒΕΛΤΙΣΤΟΠΟΙΗΣΗ ΔΙΚΤΥΩΝ ΜΕΓΑΛΗΣ ΚΛΙΜΑΚΑΣ
PROBLEMS OF ANALYSIS AND OPTIMIZATION OF LARGE SCALE NETWORKS PRESENT SERIOUS DIFFICULTIES OF A COMPUTATIONAL NATURE. SOLUTIONS TO SUCH PROBLEMS REQUIRE AMOUNTS OF COMPUTATION WHICH EXCEED THE COMPUTATIONAL CAPACITY USUALLY AVAILABLE.WITH THE AIM OF BY PASSING CERTAIN OF THE ABOVE MENTIONED …
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ΔΙΑΧΕΙΡΙΣΗ ΠΟΡΩΝ ΣΕ ΔΙΚΤΥΑ ΥΠΟΛΟΓΙΣΤΩΝ ΚΑΙ ΨΗΦΙΑΚΑ ΔΙΚΤΥΑ ΟΛΟΚΛΗΡΩΜΕΝΩΝ ΥΠΗΡΕΣΙΩΝ (ISDN)
THE ANALYSIS OF THE RESOURCE ALLOCATION PROBLEM, WHICH IS PRESENTED IN THIS WORK, IS BASED ON THE THEORY OF DISCRETE QUEUEING SYSTEMS AND DISCRETE MARKOV CHAINS. THIS ANALYSIS GIVES ANALYTICAL RESULTS FOR THE DETERMINATION OF PERFORMANCECHARACTERISTICS OF THE ALLOCATION SYSTEMS IN WHICH WE CAN …
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ΣΚΕΔΑΣΗ ΗΛΕΚΤΡΟΜΑΓΝΗΤΙΚΟΥ ΚΥΜΑΤΟΣ ΑΠΟ ΑΓΩΓΙΜΗ ΕΠΙΦΑΝΕΙΑ ΣΤΟΧΑΣΤΙΚΑ ΑΝΩΜΑΛΗ ΚΑΙ ΧΡΟΝΙΚΑ ΜΕΤΑΒΑΛΛΟΜΕΝΗ
THE SCATTERING OF PLANE ELECTROMAGNETIC WAVES FROM RANDOMLY UNEVEN SURFACES ISTHEORETICALLY INVESTIGATED BY USING MORE COMPLICATED MODELS FOR THE SCATTERING SURFACE. IN THE FIRST PART OF THE WORK A TIME-VARYING RANDOM ROUGH SURFACE IS EXAMINED. THE STOCHASTIC PROCESS, THAT DESCRIBES THE ELEVATION …
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