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Investigating Relations between Regularization and Weight Initialization in Artificial Neural Networks
Artificiella Neurala Nätverk (ANN) är en form av maskininlärning som är populär just nu. Den har många användningsområden inom dagens teknik, till exempel som bildigenkänning. Att programmera ett sådant nätverk är dock inte det lättaste man kan göra. Ett vanligt problem som uppstår när ett ANN byggs upp är överträning, vilket sker när nätverket är för kraftfullt för problemet det ska lösa. En vanlL2 regularization is a common method used to prevent overtraining in artificial neural networks. However, an issue with this method is that the regularization strength has to be properly adjusted for it to work as intended. This value is usually found by trial and error which can take some time, especially for larger networks. This process could be alleviated if there was a mathematical relationsh
Decision support systems: Influential factors in the startup and investor ecosystem
Startups struggle to transition from young and early stage startups to mature operational startups because of challenges in acquiring Venture Capital investments due to the competition from existing peers. This thesis proposes the use of Decision Support Systems to create and sustain competitive advantage for startups in the pre-investment and post-investment phases. The Actor Network theory has b
WWF: A Transversal Bridging Organization. Exploring the Role of WWF in the Urban Climate Governance Arena.
Farkoststyrning och förarmiljö
Time-resolved and Wavelength-resolved Spectroscopy In 2-photon-excited Fluorescence Microscopy
TIA – akut handläggning och behandling minskar strokerisk
Skakad bortom rimligt tvivel? - Svenska domstolars bevisvärdering av medicinsk sakkunnigbevisning gällande diagnosen skakvåld
Den senaste tiden har ifrågasättandet av diagnosen skakvåld fått mycket uppmärksamhet, bl.a. eftersom HD i NJA 2014 s. 699, just på grund av ovan nämnda ifrågasättande, friade den tilltalade från anklagelserna om skakvåld. I ett annat fall beviljade HD resning för en man som tidigare dömts för skakvåld. Syftet med denna uppsats är att granska diagnosen skakvåld ur ett juridiskt perspektiv. Det ske
Hit, men inte längre! – En granskning av målsägandens begränsade rätt till målsägandebiträde i hovrättsprocessen ur ett brottsofferperspektiv
Lagen (1988:609) om målsägandebiträde, vilken medger en rätt till biträde för brottsoffer som utsatts för särskilt allvarlig brottslighet, har varit en central lagstiftning för att stärka brottsoffrets intressen i rättsprocessen. Till följd av en lagreform som genomfördes år 2018 har dock rätten begränsats i högre rätt. Detta har i sin tur mötts av omfattande kritik med hänsyn till brottsoffrens i
Jakten på politiskt engagemang: En kvantitativ innehållsstudie om hur politiska partier skapar engagemang på sociala medier
Engagemang på sociala medier inom politisk kommunikation är ett aktuellt forskningsområde för strategisk kommunikation. I det digitala samhället finns det starka incitament för partier att skapa ett högt engagemang på sociala medier för att nå ut med sina politiska budskap. Syftet med den här studien är att undersöka hur engagemang som beroende variabel kan förklaras med kommunikationsstrategier, Engagement on social media in political communication is a highly relevant area for strategic communication research. There are clear incentives for political parties to create high levels of engagement in their social media channels, in order to reach out with their political messages in today’s digital society. The purpose of this study is to examine to which degree the dependent variable engage
Close stellar encounters at the Galactic Centre - I. The effect on the observed stellar populations
We model the effects of collisions and close encounters on the stellar populations observed in the Milky Way nuclearstellar cluster (NSC). Our analysis is based on N -body simulations in which the NSC forms by accretion of massivestellar clusters around a supermassive black hole. We attach stellar populations to our N -body particles and follow theevolution of their stars, and the rate of collisio
Interpretation of captopril renography using artificial neural networks.
The purpose of this study was to develop a method based on artificial neural networks for interpretation of captopril renography tests for the detection of renovascular hypertension caused by renal artery stenosis and to assess the value of different measurements from the test. A total of 250 99mTc-MAG3 captopril renography tests were used in the study. The material was collected from two differen
Laser-Matter Interactions at Extreme Irradiance: X-ray Generation and Relativistic Channelling
This thesis summarizes experimental work in which the powerful Ti:sapphire lasers at the High Power Laser Facility at the Lund Laser Centre have been employed to investigate laser-produced X-rays and relativistic channelling. These lasers produce short pulses, of the order of 50 fs, with energies ranging from 1 mJ to 1 J. Thus, the peak powers reach several terawatts and with the most powerful las
Visualizing the entire DNA from a chromosome in a single frame
The contiguity and phase of sequence information are intrinsic to obtain complete understanding of the genome and its relationship to phenotype. We report the fabrication and application of a novel nanochannel design that folds megabase lengths of genomic DNA into a systematic back-and-forth meandering path. Such meandering nanochannels enabled us to visualize the complete 5.7 Mbp (1mm) stained DN
NMDA receptor stimulation induces reversible fission of the neuronal endoplasmic reticulum.
With few exceptions the endoplasmic reticulum (ER) is considered a continuous system of endomembranes within which proteins and ions can move. We have studied dynamic structural changes of the ER in hippocampal neurons in primary culture and organotypic slices. Fluorescence recovery after photobleaching (FRAP) was used to quantify and model ER structural dynamics. Ultrastructure was assessed by el
Decision Support for the Initial Triage of Patients with Acute Myocardial Infarction
Objectives: To develop an automated tool for the analysis of electrocardiograms (ECG) with respect to changes that make the patient a candidate for reperfusion therapy. An additional aim was to assess the influence of the tool on the ECG classifications of three interns. Methods and Results: An artificial neural network was trained to interpret ECGs regarding changes making the patient a candi
The Chirality-Flow Method for Massive and Electroweak Amplitudes
Det finns många vägar att gå i jakten efter en bättre förståelse för vår materiella världs minsta beståndsdelar, elementarpartiklarna. Vi kan bygga kraftigare och mer exakta partikelacceleratorer och därmed förbättra den experimentella delen av partikelfysiken. Vi kan också försöka hitta nya teorier om hur världen fungerar, något som i praktiken är väldigt komplicerat. Vi kan istället fokusera på In this thesis I extend the chirality-flow method to the full standard model at tree-level by including massive particles and electroweak interactions. The chirality-flow method is a new diagrammatic method for calculating Feynman diagrams that is based on the spinor-helicity formalism, that before this thesis was written had been worked out for massless QED and QCD at tree-level. I summarize what
Lead time analysis and reduction at Alfa Laval DC Lund
Alfa Laval DC Lund is both a spare part manufacturer and distributer. The spare parts that Alfa Laval DC Lund supplies are used for the heat transfer business unit of Alfa Laval. Sometimes orders need to be produced fast as customers may have breakdowns in production and sometime orders arrive months earlier than customers want to receive delivery as scheduled services occur at the customer. Probl
Ränteavdragsreglernas förenlighet med EU-rätten
Ränteavdragsreglerna har alltsedan de infördes år 2009 varit föremål för kritik, exempelvis vad gäller deras förenlighet med de i FEUF fastslagna fria rörligheterna. Trots att HFD har konstaterat att ränteavdragsreglerna är förenliga med de fria rörligheterna kvarstår kritiken. Reglernas syfte är att skydda den svenska bolagsskattebasen genom att begränsa den generella avdragsrätten för ränteutgif
Resistivity investigation and monitoring for detection of internal erosion and anomalous seepage in embankment dams
Methods for monitoring seepage and detecting internal erosion are essential for the safety evaluation of embankment dams. Internal erosion is one of the major reasons for embankment dam failures, and there are several tenths of thousands of large embankment dams in the world. Internal erosion is progressing inside the dam, and is sometimes difficult to detect by conventional methods. Therefore, th
