Abstract. Mobile Ad-Hoc Networks, or MANETs, provide communication between free-roaming mobile hosts without a fixed infrastructure. These MANETs operate under conditions of limited battery power and may also experience frequent network partitioning. This paper introduces a data replication technique called REALM (REplication of data for A Logical group based MANET database). REALM takes advantage of application semantics when determining where to place replicas of data items. It also tries to predict network partitioning and disconnection ahead of time and creates copies of data items accordingly. Experiments show that REALM increases the percentage of successful transactions with or without the presence of network disconnection and partitioning.

No abstract

This work reports the interfacial thermal conductance (G) and radiative recombination efficiency (β)also known as photoluminescence quantum yield (PL QY)of monolayer WSe2 flakes supported by fused silica substrate via state-resolved energy transport Raman (ET-Raman). This is the first known work to consider the effect of radiative electron-hole recombination on the thermal transport characteristics of single layer transition metal dichalcogenides (TMDs). ET-Raman uses a continuous wave laser for steady state heating as well as nanosecond and picosecond lasers for transient energy transport to simultaneously heat the monolayer flakes and extract the Raman signal. The three lasers induce distinct heating phenomena that distinguish the interfacial thermal conductance and radiative recombination efficiency which can then be determined in tandem with 3D numerical modeling of the temperature rise from respective laser irradiation. For the five samples measured, G is found to range from 2.10 0.14  to 15.9 5.0  MW m -2 K -1 and β ranges from 36 6  to 65 7  %. These values support the claim that interfacial phenomena such as surface roughness and 2D materialsubstrate bonding strength play critical roles in interfacial thermal transport and electron-hole recombination mechanisms in TMD monolayers. It is also determined that low-level defect density enhances the radiative recombination efficiency of single layer WSe2.