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Showing 1 to 15 of 15 for “"Επιστήμη Ηλεκτρονικών Υπολογιστών και Πληροφορική"”.
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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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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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ΠΡΟΣΕΓΓΙΣΤΙΚΑ ΜΟΝΤΕΛΑ ΓΙΑ ΤΗΝ ΑΝΑΛΥΣΗ ΤΗΣ ΑΠΟΔΟΣΗΣ ΠΟΛΥΕΠΕΞΕΡΓΑΣΤΙΚΩΝ ΣΥΣΤΗΜΑΤΩΝ ΥΠΟΛΟΓΙΣΤΩΝ
THIS THESIS INVESTIGATES THE PERFORMANCE OF MULTISTAGE BUFFERED INTERCONNECTIONNETWORKS (MBINS) FOR MULTIPROCESSORS. THE EXACT SOLUTION OF THE FIRST STAGE OF MBINS IS PROVIDED, WHEN BUFFERS OF FINITE OR INFINITE LENGTH ARE PRESENT AT THE SWITCHES OF THE STAGE. AN APPROXIMATE SOLUTION IS PRESENTED …
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ΧΕΙΡΟΤΕΡΗ ΚΑΙ ΜΕΣΗ ΣΥΜΠΕΡΙΦΟΡΑ ΠΑΡΑΛΛΗΛΩΝ ΑΛΓΟΡΙΘΜΩΝ ΓΙΑ ΠΡΟΒΛΗΜΑΤΑ ΓΡΑΦΩΝ
IN THIS THESIS FAST, OPTIMAL AND/OR EFFICIENT PARALLEL ALGORITHMS ARE DEVELOPEDFOR MANY IMPORTANT GRAPH PROBLEMS WHICH IMPROVE SIGNIFICANTLY THE COMPLEXITIESOF THE BEST PREVIOUS KNOWN PARALLEL ALGORITHMS ON THE SAME PROBLEMS. MORE PRECISELY WE INVESTIGATE, (I) THE WORST-CASE PARALLEL COMPLEXITY …
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ΓΡΗΓΟΡΟΙ ΑΛΓΟΡΙΘΜΟΙ ΓΙΑ ΤΗΝ ΤΑΥΤΟΠΟΙΗΣΗ ΣΥΣΤΗΜΑΤΩΝ ΜΕ ΓΡΑΜΜΙΚΗ ΦΑΣΗ
FIR FILTERS WITH LINEAR PHASE ARE WIDELY USED IN MANY APPLICATIONS SUCH AS COMMUNICATIONS, SPECTRAL ANALYSIS, IMAGE PROCESSING, SPEECH PROCESSING, BIOENGINEERING ETC. THE LS ESTIMATE OF THE IMPULSE RESPONSE OF SUCH FILTERS IS KNOWN TO BEGIVEN BY A STRUCTURED LINEAR SET OF EQUATIONS. IN THIS …
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Μελέτη και σχεδιασμός μηχανισμού δρομολόγησης για δίκτυα αισθητήρων
Τhis thesis deals with the optimization of the users’ authentication procedure in 4th generation mobile networks. Overall, two different problems are studied. The first problem deals with the authentication latency and the associated burden of multi-pass authentications. A novel mechanism called …
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ΜΕΘΟΔΟΛΟΓΙΑ ΠΡΟΒΛΕΨΗΣ ΖΗΤΗΣΗΣ ΗΛΕΚΤΡΙΚΗΣ ΕΝΕΡΓΕΙΑΣ
… ΥΠΟΣΥΣΤΗΜΑ ΤΗΣ ΔΗΜΟΣΙΑΣ ΕΠΙΧΕΙΡΗΣΗΣ ΗΛΕΚΤΡΙΣΜΟΥ ΚΑΙ ΓΙΝΕΤΑΙ ΕΠΕΞΕΡΓΑΣΙΑ ΔΕΔΟΜΕΝΩΝ ΜΕ ΣΚΟΠΟ ΤΗΝ ΑΠΟΚΤΗΣΗ ΠΡΟΒΛΕΨΗΣ ΤΗΣ ΖΗΤΗΣΗΣ ΙΣΧΥΟΣ ΣΕ ΔΙΑΦΟΡΕΣ ΚΑΤΑΣΤΑΣΕΙΣ ΛΕΙΤΟΥΡΓΙΑΣ.
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ΤΕΧΝΙΚΕΣ ΣΧΕΔΙΑΣΜΟΥ ΠΑΡΑΛΛΗΛΩΝ ΑΛΓΟΡΙΘΜΩΝ ΚΑΙ Η ΕΦΑΡΜΟΓΗ ΤΟΥΣ ΣΕ ΠΡΟΒΛΗΜΑΤΑ ΓΡΑΦΩΝ
IN THIS THESIS, WE PROVIDE NEW TECHNIQUES FOR THE DESIGN AND ANALYSIS OF PARALLEL ALGORITHMS AND THEIR APPLICATION TO GRAPH PROBLEMS. MORE PRECISELY: 1. WE PRESENT A DETERMINISTIC TECHNIQUE BASED ON THE DECOMPOSITION OF A PLANAR DIGRAPH INTO SPECIAL OUTERPLANAR SUBGRAPHS CALLED HAMMOCKS. 2. WE …
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ΠΡΟΒΛΗΜΑΤΑ ΣΥΝΤΟΝΙΣΜΟΥ ΤΑΥΤΟΧΡΟΝΩΝ ΠΡΟΣΠΕΛΑΣΕΩΝ ΣΕ ΒΑΣΕΙΣ ΔΕΔΟΜΕΝΩΝ
THIS THESIS DEALS WITH SOME ISSUES IN CONCURRENCY CONTROL OF DATABASE ACCESSES. MULTIVERSION SCHEDULERS ARE NOW A WIDELY ACCEPTED METHOD FOR ENHANCING THE PERFORMANCE OF THE CONCURRENCY CONTROL COMPONENT OF A DATABASE. IN THE 2ND CHAPTER OF THE THESIS WE INTRODUCE A NEW NOTION OF MULTIVERSION …
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ΕΠΙΛΥΣΗ ΠΡΟΒΛΗΜΑΤΩΝ ΧΩΡΟΘΕΤΗΣΗΣ ΚΕΝΤΡΩΝ ΠΑΡΟΧΗΣ ΥΠΗΡΕΣΙΩΝ ΣΕ ΔΙΚΤΥΟ
THE SUBJECT OF THIS THESIS IS THE SOLUTION OF THE FACILITY LOCATION PROBLEM (FLP) IN SUCH WAY THAT ANY DEMAND POINT CAN BE SERVICED BY A FLP IN A TIME-DISTANCE LESS THAN A GIVEN T (PROBLEM (F)). PROBLEM (F) BELONGS TO THE WELL KNOWN CATEGORY OF NP-HARD PROBLEMS AND UNTIL NOW IT IS TACKLED UNDER THE …
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Η λήψη αντικειμενικών αποφάσεων στην τεχνητή διατροφή με την βοήθεια ηλεκτρονικού υπολογιστή (Computer assisted medical decision making)
Malnutrition is common in surgical patients and may be an important determinant of operative morbidity and mortality. As in all branches of medicine the history is still the more important of diagnosis, so in nutritional assessment the clinical examination is used to identify patients likely to …
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ΒΕΛΤΙΣΤΟΙ ΑΛΓΟΡΙΘΜΟΙ ΚΑΤΕΡΓΑΣΙΑΣ ΓΕΩΦΥΣΙΚΩΝ ΔΕΔΟΜΕΝΩΝ
THIS THESIS DEALS WITH GEOPHYSICAL SIGNAL PROCESSING: SPECIFICALLY IT DEALS WITH THE DECONDUCTION PROBLEM. IN THE FIRST PART, STATE SPACE MODELS ARE STUDIEDAND A GENERALIZED OPTIMAL DECONVOLUTION ALGORITHM IS COMPARED WITH REGARDS TOBOTH PERFORMANCE AND COMPUTATIONAL COMPLEXITY TO EXISTING …
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ΑΝΑΛΥΣΗ ΚΑΙ ΣΧΕΔΙΑΣΜΟΣ ΤΟΥ ΠΥΡΗΝΑ ΤΟΥ ΛΕΙΤΟΥΡΓΙΚΟΥ ΣΥΣΤΗΜΑΤΟΣ ΤΗΣ ΠΟΛΥΕΠΕΞΕΡΓΑΣΤΙΚΗΣ ΜΗΧΑΝΗΣ SIMULA
THE AREA OF DISCRETE EVENT SIMULATION (DES) IS THE LEAST IMPACTED BY PARALLEL PROCESSING EVEN THOUGH MOST OF ITS APPLICATIONS REQUIRE TREMENDOUS AMOUNTS OF PROCESSING TIME. THE COMMON APPROACH OF PARALLELIZING INDIVIDUALLY SPECIAL PURPOSE PROGRAMS LEADS TO VERY LIMITED IMPROVEMENTS IN PERFORMANCE. …
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ΑΥΤΟΠΡΟΣΑΡΜΟΖΟΜΕΝΟΙ ΑΛΓΟΡΙΘΜΟΙ ΑΥΤΟΜΑΤΟΥ ΕΛΕΓΧΟΥ: ΣΥΓΚΡΙΤΙΚΗ ΥΠΟΛΟΓΙΣΤΙΚΗ ΑΝΑΛΥΣΗ-ΠΑΡΑΛΛΗΛΙΣΜΟΣ
THE SUBJECT OF THIS THESIS WAS THE STUDY OF BOTH KNOWN AND NEW ADAPTIVE CONTROL ALGORITHMS, FOR LINEAR, STOCHASTIC, DISCRETE TIME SYSTEMS, WITH UNKNOWN PARAMETERS. WE CONSIDERED FIRST THE CASE WHERE THE SYSTEM MODEL IS IN STATE SPACE FORM. THE TWO WELL KNOWN ADAPTIVE CONTROL ALGORITHMS, FOR SYSTEMS …
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SCAN: ΜΙΑ ΓΛΩΣΣΑ ΓΙΑ ΑΚΟΛΟΥΘΙΑΚΗ ΠΡΟΣΠΕΛΑΣΗ ΔΙΔΙΑΣΤΑΤΩΝ ΔΕΔΟΜΕΝΩΝ
THE MAIN OBJECTIVE OF THIS WORK IS THE PRESENTATION AND THE DEVELOPMENT OF A NEW, SPECIAL PURPOSE LANGUAGE, CALLED SCAN LANGUAGE. THE DEVELOPMENT OF SCAN PROVIDES AN EFFICIENT APPROACH TO THE FOLLOWING PROBLEM: "GIVEN AN IMAGE ARRAY P OFNXN ELEMENTS, DEVELOP A TOOL WHICH CAN DESCRIBE AND PRODUCE …