Sökning: "time horizons"

Visar resultat 1 - 5 av 150 uppsatser innehållade orden time horizons.

1. 1. Gravitational Collapse of a Massless Scalar Field in a Theory of Minimally Modified Gravity

   Master-uppsats, KTH/Fysik

   Författare :Atabak Fathe Jalali; [2024]
   Nyckelord :Theoretical physics; astrophysics; modified gravity; minimally modified gravity; gravitational collapse; VCDM; scalar collapse; apparent horizon; numerical relativity; Teoretisk fysik; astrofysik; modifierad gravitation; minimalt modifierad gravitation; gravitationskollaps; VCDM; skalär kollaps; uppenbar horisont; numerisk relativitet;

   Sammanfattning : This thesis explores the spherically symmetric gravitational collapse of a massless scalar field in a minimally modified gravity theory denoted VCDM (V replaces $\Lambda$ in the $\Lambda$CDM abbreviation), a class of theories propagating the same degrees of freedom as general relativity at the expense of broken 4D diffeomorphism invariance. Numerical evolution of the equations of motion reveals that for small initial scalar profile amplitudes, no black hole forms from the collapse. LÄS MER

3. 2. Predicting Electricity Consumption with ARIMA and Recurrent Neural Networks

   Kandidat-uppsats, Uppsala universitet/Statistiska institutionen

   Författare :Klara Enerud; [2024]
   Nyckelord :time series forecasting; ARIMA; recurrent neural networks; LSTM; electricity forecasting; EED forecasting;

   Sammanfattning : Due to the growing share of renewable energy in countries' power systems, the need for precise forecasting of electricity consumption will increase. This paper considers two different approaches to time series forecasting, autoregressive moving average (ARMA) models and recurrent neural networks (RNNs). LÄS MER

4. 3. Can Machine Learning improve inflation forecasting?

   Magister-uppsats, Lunds universitet/Nationalekonomiska institutionen

   Författare :Emil Hansson; [2023]
   Nyckelord :Inflation Forecast; Machine Learning; Rolling Window; Time Series; Business and Economics;

   Sammanfattning : This paper aims to compare and evaluate the performance of inflation forecasting performance for benchmark time series models and machine learning models. The process is performed for both a developed economy, the US, and an emerging economy, Mexico. LÄS MER

5. 4. SAX meets Word2vec : A new paradigm in the time series forecasting

   Uppsats för yrkesexamina på avancerad nivå, Högskolan i Halmstad/Akademin för informationsteknologi

   Författare :Erik Janerdal; David Dimovski; [2023]
   Nyckelord :Contextual Time Series; Forecasting; ARIMA; SARIMA; Word2vec; SAX;

   Sammanfattning : The purpose of this thesis was to investigate whether some successful ideas in NLP, such as word2vec, are applicable to time series prob- lems or not. More specifically, we are interested to assess a combina- tion of previously proven methods such as SAX and Word2vec. LÄS MER

7. 5. Resilient Horizons: Identifying and Overcoming Disruptions in the Semiconductor Supply Chain : From Chip Woes to Chip Wows: Establishing Resilience Strategies in a World of Semiconductors

   Master-uppsats, Linköpings universitet/Logistik- och kvalitetsutveckling

   Författare :Clara Hallin; Marcus Höök; [2023]
   Nyckelord :Resilience; Strategy; Disruption; Semiconductor; Supply Chain;

   Sammanfattning : Disruptions such as pandemics, demand changes, and geopolitical tensions in the semiconductor supply chain are essential due to their significant impact on all industries and economies worldwide. The semiconductor industry is vital for modern technology, but disruptions can interfere with production and availability. LÄS MER