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All Journal International Journal of Informatics, Information System and Computer Engineering (INJIISCOM)
Ekra, Md Emadur Rahman
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Computer Science & IT Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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A Research on Positioning Algorithm Based on RPCA in Sparse Fingerprint Environment Xie, Yaqin; Ekra, Md Emadur Rahman; Gu, Tianyuan; Wang, Xiaoli
International Journal of Informatics, Information System and Computer Engineering (INJIISCOM) Vol. 6 No. 2 (2025): INJIISCOM: VOLUME 6, ISSUE 2, DECEMBER 2025
Publisher : Universitas Komputer Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34010/injiiscom.v6i2.14980

Abstract

The indoor positioning method based on Wi-Fi fingerprinting has the advantages of simple acquisition and low cost. However, during signal collection, the presence of significant noise in the environment can cause fluctuations in signal strength measurements due to environmental variations. Additionally, a large number of fingerprints usually need to be collected to achieve high positioning accuracy. To address these issues, this paper proposes a positioning method based on a robust principal component analysis algorithm (RPCA) in a sparse fingerprint environment. Firstly, considering the outlier noise present in the collected signals, purification is performed based on signal measurement weights, and the refined fingerprints are stored in the fingerprint database. Secondly, given the high cost of collecting fingerprints, this paper generates some virtual fingerprints near reference points based on a transmission loss model, all of which are stored in an offline fingerprint database. Finally, adaptive K-value fingerprint matching is used to obtain the final results. The results show that the proposed algorithm can improve positioning accuracy in a sparse fingerprint environment.
Optimized Resonance Control in Gold T-shaped Nanoantennas for Advanced Plasmonic Applications Mahmud, Tanjoy; Ekra, Md Emadur Rahman; Ahmed, Tanvir; Bachar, Dipayon; Mahmud, Tonmoy
International Journal of Informatics, Information System and Computer Engineering (INJIISCOM) Vol. 8 No. 1 (2027): INJIISCOM: VOLUME 8, ISSUE 1, JUNE 2027 (Online First)
Publisher : Universitas Komputer Indonesia

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Abstract

Nanoscale resonant optical antennas are highly regarded for their capacity to enhance electric fields in localized volumes smaller than the diffraction limit. This makes them particularly attractive for coupling with quantum emitters. However, a significant challenge in applications involving spectral shifts is fabricate nanoantennas that provide two distinct resonances—one at the excitation frequency and another at the emission frequency. To address this, we propose a coupled T-shaped nanoantenna design that allows for independent control of the resonances, while sharing a common electromagnetic hot spot within the antenna gap. We present the fabrication of such structures and evaluate their spatial, time-integrated, spectral, and polarization-dependent electromagnetic field characteristics, both experimentally and theoretically. The nanoantennas display two separate resonances, each with distinct spectral and polarization behaviors. These resonance wavelengths can be independently adjusted by changing the geometry of the individual T-shaped antennas.
Co-Authors Ahmed, Tanvir Bachar, Dipayon Gu, Tianyuan Mahmud, Tanjoy Mahmud, Tonmoy Xiaoli Wang Xie, Yaqin