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Alexander Andreev,Nadia McMillan,Kelli Money,Max Shutran,Christopher Ogilvy 대한뇌혈관외과학회 2023 Journal of Cerebrovascular and Endovascular Neuros Vol.25 No.3
Traumatic internal carotid artery injuries can produce direct carotid-cavernous fistulas as well as giant internal carotid artery pseudoaneurysms. Clinical sequelae can include headaches, cranial nerves palsies, proptosis, chemosis and optic neuropathy with visual loss as the most dangerous complication. Herein, we present a case of one of the largest reported internal carotid artery pseudoaneurysms associated with a direct carotid cavernous fistula. We describe the techniques and pitfalls of treatment with parent vessel occlusion.
3GPP LTE-Assisted Wi-Fi-Direct: Trial Implementation of Live D2D Technology
Alexander Pyattaev,Jiri Hosek,Kerstin Johnsson,Radko Krkos,Mikhail Gerasimenko,Aleksandr Ometov,Pavel Masek,Sergey Andreev,Jakub Sedy,Vit Novotny,Yevgeni Koucheryavy 한국전자통신연구원 2015 ETRI Journal Vol.37 No.5
This paper is a first-hand summary on our comprehensive live trial of cellular-assisted device-to-device (D2D) communications currently being ratified by the standards community for next-generation mobile broadband networks. In our test implementation, we employ a full-featured 3GPP LTE network deployment and augment it with all necessary support to provide real-time D2D connectivity over emerging Wi-Fi-Direct (WFD) technology. As a result, our LTE-assisted WFD D2D system enjoys the required flexibility while meeting the existing standards in every feasible detail. Further, this paper provides an account on the extensive measurement campaign conducted with our implementation. The resulting real-world measurements from this campaign quantify the numerical effects of D2D functionality on the resultant system performance. Consequently, they shed light on the general applicability of LTE-assisted WFD solutions and associated operational ranges.
Magnetization Study of a GdFe5Al7 Single Crystal
Denis I. Gorbunov,Alexander V. Andreev,Michael D. Kuz’min 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.10
A GdFe5Al7 single crystal with the tetragonal ThMn12-type structure has been studied in magnetic fields up to 14 T. The compound is ordered ferrimagnetically below TC = 262 K. Magnetization isotherms measured along the main crystallographic directions indicate that GdFe5Al7 displays easy-plane anisotropy. Anisotropy is also present within the basal plane between the [100] and [110]axes. The easy magnetization direction is the [110] axis with the spontaneous magnetic moment Ms = 0.58 µB/f.u. at T = 2 K.
High-temperature oxidation of europium (II) sulfide
Yuriy G. Denisenko,Maxim S. Molokeev,Alexander S. Krylov,Aleksandr S. Aleksandrovsky,Aleksandr S. Oreshonkov,Victor V. Atuchin,Nikita O. Azarapin,Pavel E. Plyusnin,Elena I. Sal’nikova,Oleg V. Andreev 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.79 No.-
The process of high-temperature oxidation of EuS in the air was explored in the temperature range of500–1000 C. The oxidation reaction enthalpy was determined (DH0exp =1718.5 kJ/mol). The study ofoxidation products allowed to establish the mechanism of EuS oxidation with oxygen. At 500–600 C, EuSis oxidized to a mixture of Eu3+-containing compounds (Eu3S4, Eu2O2S). In the range of 700–1000 C, onlyeuropium oxysulfate Eu2O2SO4 is formed. The structure refinement for Eu2O2SO4 was performed by theRietveld method. The luminescence intensity of europium oxysulfate Eu2O2SO4 with characteristic 4f-4ftransitions from the 5D0 state was investigated as a function of oxidation temperature.
Anomalous Increase of TC in UGa2 under Pressure
Alexandre Kolomiets,Ladislav Havela,Jiˇr´ı Prchal,Alexander V. Andreev 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.10
UGa2 is 5f ferromagnet with TC = 126 K. High-pressure study of a single crystal exhibits a dramatic increase of TC without any sign of saturation, reaching 155 K at p = 7 GPa, corresponding to +4 K/GPa. Such effect can be understood assuming a weak 5f delocalization and an exchange interaction driven by the hybridization with non-f states, which is strengthened under pressure.
Concept Design and Performance Evaluation of UAV-based Backhaul Link with Antenna Steering
Jiri Pokorny,Aleksandr Ometov,Pablo Pascual,Carlos Baquero,Pavel Masek,Alexander Pyattaev,Ainoa Garcia,Carlos Castillo,Sergey Andreev,Jiri Hosek,Yevgeni Koucheryavy 한국통신학회 2018 Journal of communications and networks Vol.20 No.5
At present, cellular coverage in many rural areas remainsintermittent. Mobile operators may not be willing to deployexpensive network infrastructure to support low-demand regions. For that reason, solutions for the rapid deployment of base stationsin areas with insufficient or damaged operator infrastructureare emerging. Utilization of unmanned aerial vehicles (UAVs) ordrones serving as data relays holds significant promise for deliveringon-demand connectivity as well as providing public safety servicesor aiding in recovery after communication infrastructure failurescaused by natural disasters. The use of UAVs in provisioninghigh-rate radio connectivity and bringing it to remote locations isalso envisioned as a potential application for fifth-generation (5G)communication systems. In this study, we introduce a prototypesolution for an aerial base station, where connectivity between adrone and a base station is provided via a directional microwavelink. Our prototype is equipped with a steering mechanism drivenby a dedicated algorithm to support such connectivity. Our experimentalresults demonstrate early-stage connectivity and signalstrength measurements that were gathered with our prototype. Our results are also compared against the free-space model. Thesefindings support the emerging vision of aerial base stations as partof the 5G ecosystem and beyond.