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A New Euthyplociid Burrowing Mayfly (Ephemeroptera: Euthyplociinae, Polymitarcyidae) from Vietnam
Van Vinh Nguyen,Yeon Jae Bae 한국통합생물학회 2003 Animal cells and systems Vol.7 No.4
A new euthyplociid burrowing mayfly (Polymitarcyidae, Ephemeroidea, Ephemeroptera), Polyplocia orientalis n. sp., from Vietnam is described with larval habitus and line drawings of mouthparts. The larva of the species is characterized by the mandibular tusks that bear numerous hairlike and stout setae on their dorsal and lateral surfaces and by the apical process of foretibiae that is nearly one-fourth the length of foretarsi. Its habitat and biological data and taxonomic remarks are provided. The burrowing mayfly subfamily Euthyplociinae is reviewed from a historical perspective.
Larvae of the Heptageniid Mayfly Genus Epeorus (Ephemeroptera: Heptageniidae) from Vietnam
Van Vinh Nguyen,Yeon Jae Bae 한국응용곤충학회 2004 Journal of Asia-Pacific Entomology Vol.7 No.1
Larvae of six Vietnamese species of heptageniid mayflies in the genus Epeorus Eaton are reviewed: Epeorus aculeatus Braasch (new record), E. bifurcatus Braasch and Sold n, E. carinatus Braasch and Sold n, E. hieroglyphicus Braasch and Sold n, E. tiberius Braasch and Sold n, and E. soldani sp. n. Their descriptions, diagnoses, line drawings of key characters, distributions, habitat and biological data, taxonomic remarks, and a larval key are provided.Key words description, Epeorus soldani, Southeast Asia, taxonomy
A Hybrid Positioning System for Indoor Navigation on Mobile Phones using Panoramic Images
( Van Vinh Nguyen ),( Jong Weon Lee ) 한국인터넷정보학회 2012 KSII Transactions on Internet and Information Syst Vol.6 No.3
In this paper, we propose a novel positioning system for indoor navigation which helps a user navigate easily to desired destinations in an unfamiliar indoor environment using his mobile phone. The system requires only the user`s mobile phone with its basic equipped sensors such as a camera and a compass. The system tracks user`s positions and orientations using a vision-based approach that utilizes 360° panoramic images captured in the environment. To improve the robustness of the vision-based method, we exploit a digital compass that is widely installed on modern mobile phones. This hybrid solution outperforms existing mobile phone positioning methods by reducing the error of position estimation to around 0.7 meters. In addition, to enable the proposed system working independently on mobile phone without the requirement of additional hardware or external infrastructure, we employ a modified version of a fast and robust feature matching scheme using Histogrammed Intensity Patch. The experiments show that the proposed positioning system achieves good performance while running on a mobile phone with a responding time of around 1 second.
Van Tran Vinh,Moon Ju‐Young,Lee Young-Chul 한국탄소학회 2023 Carbon Letters Vol.33 No.2
Carbon nanodots (CNDs) are 0D quasi-spherical nanoparticles that are less than 10 nm in size. CNDs that possess surface functional groups such as hydroxyl, amino, and carboxyl groups have been demonstrated to scavenge free radicals efficiently and effectively, resulting in them being beneficial for cosmetic and cosmeceutical applications. In this study, we successfully prepared novel CNDs, namely black VC, using vitamin C (VC) as a promising precursor. Black VC was prepared by a facile one-step method based on short-time microwave irradiation. The properties of black VC were characterized by transmission electron microscopy (TEM) analysis, X-ray diffraction (XRD), high-resolution X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) spectroscopy, and UV–vis spectrophotometry. Radical scavenging, cell viability, and anti-pollution activity assays were also conducted to demonstrate the functionalities of black VC. The developed black VC exhibited lower cytotoxicity and better antioxidant, metal chelating ability, and anti-pollution activities than its precursor. These results provide a new approach for developing advanced antioxidants for innovative cosmetic formulations using a simple microwave treatment method. However, black VC retained some problems of its precursor in the form of low stability, which is likely to be a challenge for its cosmeceutical application.