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Knapsack sets for cryptography
(Lappeenraata University of Technology, 1994-05-06)
The basic goal of this study is to extend old and propose new ways to generate knapsack sets suitable for use in public key cryptography. The knapsack problem and its cryptographic use are reviewed in the introductory ...
Merchandising Strategies and Retail Performance for Seasonal Fashion Products
(Lappeenranta Univesity of Technology, 1999-03-19)
This study presents mathematical methods for evaluation of retail performance with special regard to product sourcing strategies. Forecast accuracy, process lead time, offshore / local sourcing mix and up front / replenishment ...
Use of neural networks in robot positioning of large flexible redundant manipulators
(Lappeenranta University of Technology, 1999-10-06)
Deflection compensation of flexible boom structures in robot positioning is usually done using tables containing the magnitude of the deflection with inverse kinematics solutions of a rigid structure. The number of table ...
Coping with Technology: A Study on Economic Methodology and Strategic Management of Technology
(1995-12-08)
There is a broad consensus among economists that technologicalchange has been a major contributor to the productivity growth and, hence, to the growth of the material welfare in western industrialized countries at least ...
Offdesign operation of kraft recovery boiler
(Lappeenranta University of Technology, 1993-10-01)
A model to solve heat and mass balances during the offdesign load calculations was created. These equations are complex and nonlinear. The main new ideas used in the created offdesign model of a kraft recovery boiler are ...
On the Application of Beam on Elastic Foundation Theory to the Analysis of Stiffened Plate Strips
(Lappeenranta University of Technology, 1999-10-08)
The main objective of this thesis is to show that plate strips subjected to transverse line loads can be analysed by using the beam on elastic foundation (BEF) approach. It is shown that the elastic behaviour of both the ...
Position sensorless electrically excited synchronous motor drive for industrial use based on direct flux linkage and torque control
(Lappeenranta University of Technology, 1999-04-16)
Synchronous machines with an AC converter are used mainly in large drives, for example in ship propulsion drives as well as in rolling mill drives in steel industry. These motors are used because of their high efficiency, ...
Freezing Point Depressions of Dilute Solutions of Alkali Metal Chlorides and Bromides
(1999)
Freezing point depressions (¿Tf) of dilute solutions of several alkali metal chlorides and bromides were calculated by means of the best activity coefficient equations. In the calculations, Hückel, Hamer and Pitzer ...
Lämmönvaihtimien likaantumisen ja ylimenokorroosion tutkiminen raakaöljyn tislauksessa.
(1999)
Työssä tutkittiin raakaöljyn tislausyksikön esilämmityksen lämmönvaihtimien likaantumista erillisen likaantumisenseurantaohjelman avulla. Ohjelmaan syötetään prosessitiedot eri lämmönvaihtimille, joista ohjelma laskee ...
Salient Pole Synchronous Machine Modelling in an Industrial Direct Torque Controlled Drive Application
(Lappeenranta University of Technology, 1999-03-26)
Synchronous motors are used mainly in large drives, for example in ship propulsion systems and in steel factories' rolling mills because of their high efficiency, high overload capacity and good performance in the field ...