Results 101 to 110 of about 2,897,668 (300)
GPS Anti-Jamming Using Beamforming Technique
Journal of the Korea Institute of Information and Communication Engineering, 2016 GPS 위성 신호는 매우 미약하기 때문에 시스템 재밍에 노출되어 있다. 이러한 재밍은 의도적 또는 미의도적 간섭신호 송출에 따라 발생된다. 만약 재밍 신호가 수신기로 매우 강하게 들어온다면 수신기는 자동적으로 방어할 수 있도록 작동되어야한다. 재밍 상황에서 수신기가 정상적으로 작동할 수 있도록 하는 방법은 공간 필터링이 이용되고 있다. 본 논문에서는 재밍대응 기법으로 신호처리 방법인 빔포밍을 조사하고 사용 가능여부를 분석하였다. 재밍 신호를 받으면 어레이 방향을 바꾸기 위하여 빔포밍은 센서 신호를 통제할 수 있기 때문에 재머 반대 방향으로 제어할 수 있는 고각 θ를 측정하였다. 측정결과 GPS 신호는 안테나가 제어각 안에 있을
openaire +2 more sources
Frequency Selective Rasorber With Low Insertion Loss and Ultra‐Broadband Scattering Reduction
Advanced Physics Research, EarlyView.We present a dual‐polarization broadband frequency selective rasorber featuring a transmission window in the middle of its absorption band. The proposed FSR achieves a –10 dB reflection band over 3.68–16.94 GHz with a fractional bandwidth of 128.6%, featuring a minimum insertion loss of 0.3 dB at 10.3 GHz.
Ziming Yu +4 more
wiley +1 more source
A Communication Anti-Jamming Scheme Assisted by RIS with Angular Response. [PDF]
Entropy (Basel), 2023 Wang J, Jiang W, Huang K, Sun X.
europepmc +1 more source
A phase 2 trial of hydroxychloroquine in individuals at risk for rheumatoid arthritis
Arthritis &Rheumatology, Accepted Article.Background Individuals with serum elevations of anti‐cyclic citrullinated peptide (anti‐CCP) antibodies are at increased risk for future rheumatoid arthritis (RA). No pharmacologic interventions have been approved for the prevention of RA in such ‘at‐risk’ individuals. However, hydroxychloroquine (HCQ) is used without supporting clinical trial evidence.
Kevin D. Deane +33 more
wiley +1 more source
Per‐ and polyfluoroalkyl substances and hand osteoarthritis: data from the Osteoarthritis Initiative
Arthritis &Rheumatology, Accepted Article.Objective To explore whether biological levels of specific per‐ and polyfluoroalkyl substances (PFAS) and a mixture of PFAS – reflecting the overall effect and accounting for correlations among each PFAS – relate to incident hand osteoarthritis (HOA) and progression.
Jeffrey B. Driban +14 more
wiley +1 more source
Frontiers in PhysicsSignal-of-Opportunity (SOP) navigation based on Low-Earth-Orbit (LEO) satellite constellations has increasingly become a research hotspot. Due to the large number of LEO satellites, wide spectrum coverage, and strong signal power, LEO satellite Signal-of-
Lihao Yao +17 more
doaj +1 more source
British Educational Research Journal, EarlyView.Abstract In early childhood education many researchers and professionals across the world have embraced the United Nations Convention on the Rights of the Child's requirement to include young children in decision‐making. In the context of ongoing discussion about young children's capacity to share their views and opinions about matters affecting them ...
Laura Lundy +3 more
wiley +1 more source
A Distributed Anti-Jamming Algorithm Based on Actor-Critic Countering Intelligent Malicious Jamming for WSN. [PDF]
Sensors (Basel), 2022 Chen Y, Niu Y, Chen C, Zhou Q, Xiang P.
europepmc +1 more source
British Educational Research Journal, EarlyView.Abstract Private supplementary education is burgeoning worldwide, and over 25% of English children have received private tutoring. The neoliberalisation of education and parents' responsibilisation for children's attainment have driven market growth, but not all can afford to participate.
Sarah L. Holloway +2 more
wiley +1 more source
Impacts of Phase Noise on the Anti-Jamming Performance of Power Inversion Algorithm. [PDF]
Sensors (Basel), 2022 Zhou M, Wang Q, He F, Meng J.
europepmc +1 more source