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Automodulation Processes in Clinotrons With Low-Focusing Magnetic Field
Sattorov, Matlabjon,Khutoryan, Eduard,Lukin, Konstantin,Ohjoon Kwon,Sun-Hong Min,Bhattacharya, Ranajoy,In-Keun Baek,Seontae Kim,Minwoo Yi,Joonho So,Gun-Sik Park Institute of Electrical and Electronics Engineers 2015 IEEE transactions on electron devices Vol.62 No.5
<P>The automodulation processes in backward-wave oscillator with an inclined electron beam (the clinotron) operating at low-focusing magnetic fields have been studied. The automodulation behavior has been analyzed in the clinotron for different angles of the beam inclination. It has been shown that at low magnetic fields, the RF transverse electric field may cause significant changes in electron trajectories, and hence in the beam-wave interaction power that leads to the automodulation.</P>
Improved Efficiency of Backward-Wave Oscillator With an Inclined Electron Beam
Sattorov, M.,Khutoryan, E.,Lukin, K.,Ohjoon Kwon,Gun-Sik Park IEEE 2013 IEEE transactions on electron devices Vol.60 No.1
<P>The possibility of the efficient operation of a backward-wave oscillator (BWO) with an electron beam inclined with respect to the surface of a periodic structure-a clinotron-is analyzed here. The beam inclination provides the possibility of effective interaction by all particles of a thick electron beam with the slow evanescent harmonic of the cavity modes. The problem of electron-beam-wave interaction is treated in a self-consistent formulation. A theoretical analysis shows that the inclination of the electron beam to the grating surface decreases the demand of the clinotron for magnetic field magnitude and beam velocity spread compared to a conventional BWO. It is demonstrated that, for an optimal inclination angle and an optimal beam thickness, the clinotron efficiency exceeds the efficiency of a conventional BWO considerably given the same electron beam parameters. The developed multimode theory results are in satisfactory agreement with the theory of a BWO in terms of reflections and particle-in-cell simulations.</P>
Thermal Analysis of a Strapped Magnetron
Sattorov, M. A.,Bera, A.,Sharma, A.,Won-Jong Kang,Oh-Joon Kwon,Sun-Shin Jung,Dae-Ho Kim,Ki Wook Lee,Jong-Hyo Won,Chan Ho Kook,Gun-Sik Park IEEE 2011 IEEE transactions on electron devices Vol.58 No.8
<P>Thermal analysis of an <I>L</I>-band 60-kW (continuous-wave) double-ring strapped magnetron for optimizing the design of a cathode support structure and cooling system is presented. This magnetron consists of an oxygen-free copper anode with ten built-in cooling channels and a directly heated tungsten cathode. The operating temperature of the cathode is greater than 2000°C; therefore, proper thermal design of the cathode support structure is essential for reliable operation. The heat convection coefficient for the forced air is estimated by simulations comparing the simulated temperatures for different heat convection coefficients with the measured one. It is observed that the comparison between simulations with measurement is in good agreement for various temperatures from 1000°C to 2000°C when the estimated heat convection coefficient of the forced air is used.</P>
Pros and Cons of Multi-User Orthogonal Frequency Division Multiplexing
마쉬후르 사토로프(Mashhur Sattorov),여상수(Sang-Soo Yeo),강희조(Heau-Jo Kang) 한국정보기술학회 2009 Proceedings of KIIT Conference Vol.2009 No.-
지난 10년간 OFDM 기술에 적합한 적응 변조에 대한 많은 연구가 있었다. 그러나 현재는 대다수 연구자들이, 4G 시대에서 높은 QoS를 제공하기 위해서, 적응 변조 기술에 대한 높은 데이터 전송율과 고성능 다중경로 주파수 효율, 신뢰성 있는 사용자/자원 할당 등에 대한 연구에 집중하고 있음을 볼 수 있다. 따라서 이러한 변조 기법의 장단점을 분석해보는 것은 더 좋은 연구개발로 나아가는 방법이 될 수 있다. 그래서 본 논문에서는 OFDM 분산 스펙트럼 기법의 장단점을 살펴보고, 단점에 대한 해결책을 집중 조명하고자 한다. In the past decades, most researches focused on adaptive modulation on orthogonal frequency division modulation (OFDM) technique. However, nowadays, we can observe majority of scientific areas are engaging in to achieve advanced multi-path spectral efficiency, user/resource allocation in reliable as well as high data rate transmission on this modulation technique in order to achieve high quality of service (QoS) in 4G period. Therefore, obtaining this modulation scheme’s plus and minus concerns bring us to reach to develop better. Thus, in this thesis, we will focus on an overview of OFDM spread spectrum scheme’s pros and cons issues and to highlight hot solutions for disadvantages.
Efficient terahertz oscillation using a half-period staggered grating resonator
Kwon, Ohjoon,Sattorov, Matlabjon Abdurahimovich,Min, Sun-Hong,Baek, In-Keun,Kim, Seontae,Bera, Anirban,Barik, Ranjan Kumar,Bhattacharya, Ranajoy,Jeong, Jin-Young,Won, Jong-Hyo,Park, Gun-Sik IOP Publishing 2014 Japanese journal of applied physics Vol.53 No.6
A highly efficient terahertz (THz) radiation mechanism is studied with the use of strong interaction between convection electrons and a half-period phase-shifted grating resonator. The large fraction of the fundamental TE mode is longitudinally polarized, and it excites the intense plasma-terahertz wave coupling at the shallow grating, which enables highly efficient RF generation at a relatively low operating voltage. A particle-in-cell (PIC) simulation predicts that the half-period phase-staggered grating resonator generates 0.22 THz wave with output power exceeding 100 W and interaction efficiency of more than 15% at a low beam acceleration voltage of 5.2 kV. (C) 2014 The Japan Society of Applied Physics
Theory of Multimode Resonant Backward-Wave Oscillator With an Inclined Electron Beam
Khutoryan, Eduard,Sattorov, Matlabjon,Lukin, Konstantin Alexandrovich,Oh-Joon Kwon,Sun-Hong Min,Bhattacharya, Ranajoy,In-Keun Baek,Seontae Kim,Minwoo Yi,Joonho So,Gun-Sik Park IEEE 2015 IEEE transactions on electron devices Vol.62 No.5
<P>A multimode theory of the resonant backward-wave oscillator (BWO) with an electron beam inclined with respect to the surface of a periodic structure-a clinotron-is presented. It is shown that mode interaction provides phase velocity variation in the interaction space. The beam-wave interaction power increases at a favorable phase velocity profile along the interaction space, which manifests as power peaks in the clinotron zone. In contrast, when it is nonfavorable, there is power drop in the bandwidth. Developed multimode theory results are in satisfactory agreement with the theory of a BWO with reflections and with particle-in-cell simulations.</P>
Online Payment Service System for Mobile Companies in Uzbekistan
Jei Sang Jeon,Mashhur Sattorov 대한전자공학회 2008 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
Right across the world, we observe the rapid development of information-processing systems that may displace, over time, many of the systems by which payment related information is communicated. Indeed, stored value systems, as well as credit based and deposit account based systems that communicate instructions or transfer value over open communication and computer networks, represent new techniques (based on encryption schemes) to initiate payments. These new techniques hold a great deal of promise in that they potentially offer added convenience to the consumer. This promise is qualified by the question of whether these new means of payment might add to risk in the payment system.