Sökning: "Near field to far field"

Visar resultat 1 - 5 av 50 uppsatser innehållade orden Near field to far field.

  1. 1. Near Field millimeter Wave Antenna Measurements

    Master-uppsats, Lunds universitet/Institutionen för elektro- och informationsteknik

    Författare :Bharath Manjunatha; [2023]
    Nyckelord :Antenna Pattern; Near field to far field; Planar Scanning; Probe Compensation; Active Antenna; Technology and Engineering;

    Sammanfattning : In the real world, understanding an antenna's radiation pattern is crucial for its proper utilization. Typically, antennas are tested in the far-field region, where the radiation lobes are fully developed and phase errors are less than pi/8. LÄS MER

  3. 2. Property Prices and Disaster (In)Justice: Fifty Years of Demographic Change in Hawai’i County’s Lava Hazard Zones

    Master-uppsats, Lunds universitet/Avdelningen för Riskhantering och Samhällssäkerhet

    Författare :AnaCapri Mauro; [2022]
    Nyckelord :Social Vulnerability; Volcanic Hazards; Disaster Justice; Risk Governance; Temporal Analysis; Mauna Loa; Kīlauea; Social Sciences;

    Sammanfattning : While there is a degree of homogeneity in the physical impact that volcanic hazards can cause, the experience of volcanic risk and the politics of exposure are far from equal. The purpose of this thesis is to expand on research citing population growth and property price dynamics as factors encouraging settlement in the Mauna Loa and Kīlauea lava hazard zones. LÄS MER

  4. 3. Dealing With Speckle Noise in Deep Neural Network Segmentation of Medical Ultrasound Images

    Master-uppsats, KTH/Skolan för kemi, bioteknologi och hälsa (CBH)

    Författare :Olmo Daniel; [2022]
    Nyckelord :Deep Learning; Ultrasound; Speckle Filtering; Medical Image Segmentation; U-Net; Wavelet Transfrom; Djupinlärning; Ultraljud; Specklefiltrering; Medicinsk bildsegmentering; U-Net; Wavelet transformation;

    Sammanfattning : Segmentation of ultrasonic images is a common task in healthcare that requires time and attention from healthcare professionals. Automation of medical image segmentation using deep learning solutions is fast growing field and has been shown to be capable of near human performance. LÄS MER

  5. 4. Jämförande analys av kontaktlösa betalningar med bankkort och smarttelefon ur ett säkerhetsperspektiv

    M1-uppsats, KTH/Hälsoinformatik och logistik

    Författare :Tove Holmberg Tvingstedt; [2022]
    Nyckelord :Contactless payment; NFC; Near Field Communication; EMV Europay; Visa; Mastercard chip; NFC payment; payment security; NFC security; Kontaktlös betalning; Near Field Communication NFC ; närfältskommunikation EMV Europay; Visa; Mastercard chip; NFC-betalning; betalningssäkerhet; NFC- säkerhet;

    Sammanfattning : Att betala med kort är idag standardiserat, men något som också är väldigt vanligt är att betala kontaktlöst. Detta kan göras både med ett kontaktlöst kort eller med en smarttelefon. Teknologin som möjliggör detta är närfältskommunikation. LÄS MER

  7. 5. Far Field EM Side-Channel Attack Based on Deep Learning with Automated Hyperparameter Tuning

    Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Keyi Liu; [2021]
    Nyckelord :Side-Channel Attack; Deep Learning; Far Field EM emission; Auto Hyperparameter Tuning; Auto-Keras; AES; Sidokanalattack; Machine Learning; Multilayer Perceptron; Hyperparameter Tuning; Bayesian Optimization; Auto-Keras; AES;

    Sammanfattning : Side-channel attacks have become a realistic threat to the implementations of cryptographic algorithms. By analyzing the unintentional, side-channel leakage, the attacker is able to recover the secret of the target. Recently, a new type of side-channel leakage has been discovered, called far field EM emissions. LÄS MER