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Ramponi, Laura,Yasui, Youichi,Murawski, Christopher D.,Ferkel, Richard D.,DiGiovanni, Christopher W.,Kerkhoffs, Gino M.M.J.,Calder, James D.F.,Takao, Masato,Vannini, Francesca,Choi, Woo Jin,Lee, Jin W SAGE Publications 2017 AMERICAN JOURNAL OF SPORTS MEDICINE - Vol.45 No.7
<P>Conclusion: An assessment of the currently available data does suggest that BMS may best be reserved for OLT sizes less than 107.4 mm(2) in area and/or 10.2 mm in diameter. Future development in legitimate prognostic size guidelines based on high-quality evidence that correlate with outcomes will surely provide patients with the best potential for successful long-term outcomes.</P>
MHD WAVES IN A STRATIFIED VISCOUS SOLAR ATMOSPHERE
KUMAR, NAGENDRA,KUMAR, ANIL,MURAWSKI, K. The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
We study MHD wave propagation in a gravitationally stratified isothermal viscous atmosphere of the Sun, permeated by a uniform magentic field. We perform numerical simulations by launching a slow wave on the upper boundary. The driven slow wave propagates down from low-${\beta}$ to high-${\beta}$ plasma across the region where the plasma ${\beta}$ is unity. It is found that mode conversion takes place at $z{\approx}-1.8$ in the layer ${\beta}{\approx}1$. The amplitudes of horizontal and vertical velocites are smaller than those obtained in the absence of viscosity.
SAMAC: A Cross-Layer Communication Protocol for Sensor Networks with Sectored Antennas
Felemban, Emad,Vural, Serdar,Murawski, Robert,Ekici, Eylem,Kangwoo Lee,Youngbag Moon,Sangjoon Park IEEE 2010 IEEE TRANSACTIONS ON MOBILE COMPUTING Vol.9 No.8
<P>Wireless sensor networks have been used to gather data and information in many diverse application settings. The capacity of such networks remains a fundamental obstacle toward the adaptation of sensor network systems for advanced applications that require higher data rates and throughput. In this paper, we explore potential benefits of integrating directional antennas into wireless sensor networks. While the usage of directional antennas has been investigated in the past for ad hoc networks, their usage in sensor networks bring both opportunities as well as challenges. In this paper, Sectored-Antenna Medium Access Control (SAMAC), an integrated cross-layer protocol that provides the communication mechanisms for sensor network to fully utilize sectored antennas, is introduced. Simulation studies show that SAMAC delivers high energy efficiency and predictable delay performance with graceful degradation in performance with increased load.</P>
Analytical procedures for torsional vibration analysis of ship power transmission system
Senjanović,, Ivo,Hadž,ić,, Neven,Murawski, Lech,Vladimir, Nikola,Alujević,, Neven,Cho, Dae-Seung Elsevier 2019 ENGINEERING STRUCTURES Vol.178 No.-
<P><B>Abstract</B></P> <P>In this paper two relatively simple analytical procedures for free and forced torsional vibration analysis of ship power transmission systems are developed. In the first, approximate procedure, the shaft line is modelled as a two-mass system and analytical solution of the differential equations of motion is given. In the second one, a multi degree of freedom (d.o.f.) problem of the complete propulsion system is solved by the Rayleigh-Ritz method. A special attention is paid to the determination of the contribution of each cylinder to the primary and secondary engine torques by taking into account the firing order. The application of the two procedures is illustrated in the case of a typical propulsion system of a merchant ship with a slow-speed main engine connected directly to the propeller by a relatively short shaft line. The obtained results are verified by a comparison with measurements. All classification societies require calculation of the propulsion system operating parameters, but they do not provide simplified formulae for vibration analysis. The outlined analytical procedures can be used for the estimation of torsional vibration of the shaft line in the preliminary ship design stage as well as for ships in service.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Condensed two-mass model of shaft line. Analytical solution of diff. eqs. of motion. </LI> <LI> Simplified multi-mass model of shaft line. Rayleigh-Ritz method. Analytical solution. </LI> <LI> Formulation of cylinder torque and engine primary and secondary torque. </LI> <LI> Physically based transfer factor of engine excitation to shaft response. </LI> <LI> Comparison with FEM. Verification by measurement. High accuracy. </LI> </UL> </P>