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An automated approach to clustering with the framework suggested by Bradley, Fayyad and ReinaBerglund, Jesper January 2018 (has links)
Clustering with the framework suggested by Bradley, Fayyad and Reina allows for great scalability. However, practical challenges appear when applying the framework. One of the challenges is to define model parameters. This includes defining the number of clusters (K). Understanding how parameter values affect the final clustering may be challenging even with insight into the algorithm. Automating the clustering would allow for a more widespread use. The research question is thus: How could an automated process for clustering with BFR be defined and what results could such a process yield? A tailored method for parameter optimization is suggested. This method is used with a new and computationally advantageous cluster validity index called population density index. Computing the widely used within set sum of squares error requires an additional pass over the data set. Computing population density index does not. The final step of the automated process is to cluster with the parameters generated in the process. The outcome of these clusterings are measured. The results present data collected over 100 identically defined automated processes. These results show that 97 % of the identified K-values falls within the range of the suggested optimal value 2. The method for optimizing parameters clearly results in parameters that outperform randomized parameters. The suggested population density index has a correlation coefficient of 1.00 with the commonly used within set sum of square error in a 32-dimensional case. An automated process for clustering with BFR has been defined. / Ramverket som föreslås av Bradley, Fayyad och Reina möjliggör storskalig klustring. Att använda ramverket medför dock praktiska utmaningar. En av dessa utmaningar är att definiera modellens parametrar. Detta inkluderar att definiera antalet kluster (K). Att förstå hur angivna parametervärden påverkar det slutgiltiga klustringsresultatet är utmanande även med insikt i algoritmen. Att automatisera klustringen skulle möjliggöra för fler att använda ramverket. Detta resulterar i frågeställningen: Hur skulle en automatiserad process för klustring med BFR kunna definieras och vilka resultat skulle en sådan process kunna ge? En skräddarsydd metod för parameteroptimisering föreslås. Denna används i kombination med ett nytt klustervalideringsindex vilket refereras till som population density index. Användning av detta index medför beräkningsmässiga fördelar. Att beräkna det frekvent använda within set sum of squares-värdet kräver ytterligare en iteration över det använda datasettet. Att beräkna population density index undviker denna extra iteration. Det sista steget i den automatiserade processen är att klustra givet de parametervärden som processen själv definierar. Resultatet av dessa klustringar mäts. Resultaten presenterar data insamlad över 100 individuella försök. För samtliga av dessa var den automatiserade processen identiskt definierad. Resultaten visar att 97 % av de identifierade värdena på K-parametern faller inom en värdemängd baserad på det optimala värdet 2. Att optimera parametervärden med den föreslagna metoden ger tydligt bättre värden än om dessa genereras stokastiskt. Det föreslagna population density index har 1.00 som korrelationskoefficient med det välanvända within set sum of squares-värdet i ett 32-dimensionellt fall. En automatiserad process för att klustra med BFR har definierats.
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A NEW HIGH EFFICIENCY, AGILE BEAM SCANNING, BROADBAND TRACKING ANTENNA FEEDRichard, Gaetan C. 10 1900 (has links)
International Telemetering Conference Proceedings / October 25-28, 1993 / Riviera Hotel and Convention Center, Las Vegas, Nevada / Two different types of tracking feeds are currently used in the majority of telemetry
tracking antenna systems when autotrack operation is required. They are of the conical
scanner or of the single channel monopulse family and they employ well known
technologies.
In broadband applications, these feeds all suffer from the same inherent degradation in
efficiency caused by their inability to maintain a constant crossover loss value and by
their failure to properly illuminate the reflector.
In high dynamics situations they can also generate unwanted and sometimes
detrimental modulation whenever on-axis tracking is not maintained.
In addition, currently available versions of the conical scanner are not capable of high
scan rates or of scan rate agility and they are ill-suited for use in tracking systems
based on non-orthogonal axes positioners.
This paper describes a new high efficiency tracking feed system based on proven
conical scanner technology. Its design incorporates features such as variable
crossover, steerable beam, high scan rates, scan rate agility as well as stable reference
coordinate system. In addition to these features, this new feed is also capable of
delivering, in all but one operational category, levels of performance superior to that
achievable to date by any other implementation of the conical scanner or of the single
channel monopulse technology.
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Structural Investigations of the Italian Trap Allochthon, Redington Pass, Pima County, ArizonaBenson, Gregory Scott January 1981 (has links)
Italian Trap Allochthon is a rare upper-plate exposure of Paleozoic metasedimentary and Precambrian to Tertiary crystalline tectonites in the Santa Catalina-Rincon metamorphic core complex. Elsewhere in the complex, metasedimentary tectonite is usually restricted to an autochthononous position. The internal structures of the allochthon consist of numerous low-angle faults, tear faults, and overturned asymmetric and upright folds. Close association of the low-angle faults and asymmetric folds, and vergence of the folds, indicates that these folds were formed during westward transport along the low-angle faults. The structures of the allochthon are truncated and rotated to the northeast by a listric (?) normal fault. The probable shape of the fault surface, together with the northeastward rotation of the internal structures, suggests translation of the allochthon from the northeast to the southwest. The fact that metasedimentary tectonites are found in upper- plate position indicates that the listric (?) normal faulting post-dates the metamorphism of the Paleozoic and Mesozoic strata. Metamorphism in turn was part of the development of the Santa Catalina-Rincon metamorphic core complex. It is inferred that the Italian Trap Allochthon was emplaced in the final stages of profound regional extension which prevailed during the mid-Tertiary in southern Arizona.
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Přenos úrokových sazeb během krize: důkazy ze Slovenska / The Interest Rate Pass Through during the Crisis: Evidence from SlovakiaŠevcech, Marián January 2015 (has links)
The effectiveness of interest rate pass-through is crucial when shaping monetary policy. In this paper we use error correction framework in order to estimate the speed and the completeness of pass through in Slovakia. Our thesis brings a unique research on how the financial crisis and Euro adoption affect the pass-through. In Slovakia those events occur at the same time; we attempt to distinguish between what phenomenon has greater impact. We also distinguish between what bank characteristics have impact on individual bank's spread during financial crisis. Our results suggest that the interest rate pass-through completeness increases in long term. We however found evidence of decreasing pass-through in case of deposit rates during crisis. Banks are unwiling to lower them and hence harm their competitve position. The pass-through in Slovakia is found to be relatively fast and consistent throughout periods. With the crisis, the speed for mortgages rates however decreases. We conclude that the impact of financial crisis outweights the impact of Euro adoption. Concerning the banks' characteristics, we conclude that higher portion of loans on assets, higher costs over income and better liquidity position decrease the spread. This is explained by the size of Slovakian banking market; banks lower their spread to...
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Exchange Rate Pass-Through Effect and Monetary Policy in Mongolia: Small Open Economy DSGE modelBuyandelger, Oyu-Erdene January 2014 (has links)
This thesis analyzes the incomplete exchange rate pass-through effect on Mongolian economy and its implication on monetary policy under foreign and domestic shocks. The analysis is carried out in a small open economy New Keynesian DSGE model proposed by Monacelli (2005), where incomplete exchange rate pass-through is introduced via nominal rigidities on import prices. In order to accomplish the goal, we firstly derive the solutions of the model, calibrate the parameters, and finally simulate the impulse responses. Moreover, SVAR estimation is achieved to estimate the pass-through. Four main results are obtained. First, the exchange rate pass-through into import price and inflation is 0.69% and 0.49% respectively in short run, implying incomplete pass-through in Mongolia. Second, the exchange rate acts as a shock absorber for domestic productivity and foreign demand shock, but as a shock amplifier for domestic demand shock. Third, in case of incomplete pass-through the central bank of Mongolia is required to adjust the nominal interest rate more under the productivity shock, but less for the domestic and foreign demand shock. Finally, deviations from the law of one price contributes considerably to the variability of the output gap under the low pass-through. Therefore, considering incomplete pass-through in...
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Kombinační hra ve fotbale a její bránění / Combination game at football and its defendingKlamt, Ondřej January 2011 (has links)
Thesis is focused on a combination game of football as a way of consecutive offensive and also on the way of defending in this game style. It is based on both theoretical sources and original research conducted in the club SK Slavia Prague and also on the analysis of Champions League matches from year 2011. The outcomes of this thesis will be found in use as a source of information for practice trainers. Key words: Football, combination, offensive phase, defending, pass
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Further Investigation of a New Traction Stress Based Shear Strength Characterization Method with Test DataBoppudi, Srimanth 16 May 2014 (has links)
In this thesis, a new traction stress based method for characterizing shear strength is investigated by carrying out a series of shear strength tests. The AWS method for the calculation of shear strength shows significant discrepancies between longitudinal and transverse specimens. The main purpose of this new traction based definition for shear strength is to demonstrate that there exists a single shear strength value regardless of specimen geometry and loading conditions. With this new approach a better correlation between shear strength values for transverse and longitudinal specimens is achieved. Special issues occur with the multi-pass welds in regards to the failure angle. The AWS equation does not account to different failure angles of the specimens, it only assumes 45o failure angle in all the cases, but the new approach takes into account the different failure angles. Finally with this method a quantitative weld sizing can be achieved for fillet welds.
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Barrier spit evolution and primary consolidation of backbarrier facies: West Belle Pass Barrier, LAKramer, John N, III 13 May 2016 (has links)
West Belle Pass Barrier is a barrier spit that formed during the last delta lobe progradation associated with the Lafourche delta complex. Located on the western flank of the Caminada-Moreau Headland, West Belle Pass Barrier and Raccoon Pass are located downdrift of the Belle Pass jetties. Morphological changes stemming from storms, jetty infrastructure, and an expanding tidal inlet are evaluated using historical shoreline data and imagery. Littoral transport around the jetties combined with inlet growth created a framework wherein sediment is transported through Raccoon Pass and sequestered as a flood-tidal delta. These events aided in the landward migration of West Belle Pass Barrier, which ultimately loaded and consolidated previously unconsolidated facies. A conceptual model illustrating the primary consolidation of backbarrier facies resulting from washover deposits during one storm is presented. The primary consolidation settlement associated with loading near-surface, water-saturated backbarrier facies is substantially larger than current subsidence rates.
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Finite element analysis of hot rolling in the blooming millPersson, Petter January 2016 (has links)
During this thesis work a coupled thermo-mechanical finite element model (FEM) was builtto simulate hot rolling in the blooming mill at Sandvik Materials Technology (SMT) inSandviken. The blooming mill is the first in a long line of processes that continuously or ingotcast ingots are subjected to before becoming finished products. The aim of this thesis work was twofold. The first was to create a parameterized finiteelement (FE) model of the blooming mill. The commercial FE software package MSCMarc/Mentat was used to create this model and the programing language Python was used toparameterize it. Second, two different pass schedules (A and B) were studied and comparedusing the model. The two pass series were evaluated with focus on their ability to healcentreline porosity, i.e. to close voids in the centre of the ingot. This evaluation was made by studying the hydrostatic stress (σm), the von Mises stress (σeq)and the plastic strain (εp) in the centre of the ingot. From these parameters the stress triaxiality(Tx) and the hydrostatic integration parameter (Gm) were calculated for each pass in bothseries using two different transportation times (30 and 150 s) from the furnace. The relationbetween Gm and an analytical parameter (Δ) was also studied. This parameter is the ratiobetween the mean height of the ingot and the contact length between the rolls and the ingot,which is useful as a rule of thumb to determine the homogeneity or penetration of strain for aspecific pass. The pass series designed with fewer passes (B), many with greater reduction, was shown toachieve better void closure theoretically. It was also shown that a temperature gradient, whichis the result of a longer holding time between the furnace and the blooming mill leads toimproved void closure.
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Market power and heterogeneous pass-through in German electricity retailDuso, Tomaso, Szücs, Florian 29 July 2017 (has links) (PDF)
We analyze the pass-through of cost changes to retail tariffs in the German electricity market over the 2007-2014 period. We find an average pass-through rate of around 60%. This significantly varies with demand factors: while the pass-through rate to baseline tariffs, where firms have greater market power because customers are less willing to switch, is only 50%, it increases to 70% in the competitive segment of the market. Although the pass- through rate of independent firms is significantly higher than that of other firms in the competitive market segment, the extent of supply-side heterogeneity is limited. Thus, the firms' ability to exercise market power and reduce pass-through appears to be constrained by competition and largely determined by demand side factors. Finally, we find that the pass-through rate in the competitive market segment has been approaching unity over the past years, indicating a rise in competitive pressure.
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