Enabling Realistic Cross-Layer Analysis based on Satellite Physical Layer Traces

We present a solution to evaluate the performance of transport protocols as a function of link layer reliability schemes (i.e. ARQ, FEC and Hybrid ARQ) applied to satellite physical layer traces. As modelling such traces is complex and may require approximations, the use of real traces will minimise the potential for erroneous performance evaluations resulting from imperfect models. Our Trace Manager Tool (TMT) produces the corresponding link layer output, which is then used within the ns-2 network simulator via the additionally developed ns-2 interface module. We first present the analytical models for the link layer with bursty erasure packets and for the link layer reliability mechanisms with bursty erasures. Then, we present details of the TMT tool and our validation methodology, demonstrating that the selected performance metrics (recovery delay and throughput efficiency) exhibit a good match between the theoretical results and those obtained with TMT. Finally, we present results showing the impact of different link layer reliability mechanisms on the performance of TCP Cubic transport layer protocol.Comment: 6 pages, 5 figures and 1 table. Submitted at PIMRC 201

Syntheses and characterizations of Bis(trialkoxysilyl)oligoimides, 2 Syntheses and characterizations of fluorinatedcrosslinkable oligoimides with low refractive indices

International audienc

Syntheses and characterizations of Bis(trialkoxysilyl)oligoimides, 1 Synthesis of model compounds and study of the thermal self-crosslinking

International audienc

Crosslinkable colored oligoimides for electrooptical materials

The invention concerns a method for obtaining an electrooptic material characterized in that it consists in depositing on a substrate a soln. of oligoimides whereon are grafted coloring agents capable of being oriented and in performing a treatment designed to crosslink the oligoimides and to orient the coloring agents. A typical crosslinkable, colored oligoimide was manufd. by agitating a NMP soln. contg. 3.62 g 4,4'-hexafluoroisopropylidenebiphthalic anhydride and 2 g 4-(4-amino-2-hydroxyphenoxy)aniline 18 h under N, heating 3 h at 160, adding 0.35 g nadic anhydride termination agent, stirring 18 h under N, heating 3 h at 160, heating 1 equiv each resulting terminated oligoimide and C.I. Disperse Red 1 in NMP and 2.5 equiv di-Et azodicarboxylate 24 h at 80, and heating 1 equiv resulting colored, terminated oligoimide with 2 equiv plus 10% excess 3-mercaptopropyltrimethoxysilane crosslinkable compd. 12 h at 70 in THF under N in the presence of AIB

Synthesis and properties of novel polyimides containig fluorinated alkoxy side groups

International audienc

Crosslinkable colored oligoimides for electrooptical materials

The invention concerns a method for obtaining an electrooptic material characterized in that it consists in depositing on a substrate a soln. of oligoimides whereon are grafted coloring agents capable of being oriented and in performing a treatment designed to crosslink the oligoimides and to orient the coloring agents. A typical crosslinkable, colored oligoimide was manufd. by agitating a NMP soln. contg. 3.62 g 4,4'-hexafluoroisopropylidenebiphthalic anhydride and 2 g 4-(4-amino-2-hydroxyphenoxy)aniline 18 h under N, heating 3 h at 160, adding 0.35 g nadic anhydride termination agent, stirring 18 h under N, heating 3 h at 160, heating 1 equiv each resulting terminated oligoimide and C.I. Disperse Red 1 in NMP and 2.5 equiv di-Et azodicarboxylate 24 h at 80, and heating 1 equiv resulting colored, terminated oligoimide with 2 equiv plus 10% excess 3-mercaptopropyltrimethoxysilane crosslinkable compd. 12 h at 70 in THF under N in the presence of AIB

Synthesis and characterization of fluorinated crosslinkable oligoimides with linear and nonlinear optical properties

International audienc

Synthesis and characterization of fluorinated crosslinkable oligoimides with linear and nonlinear optical properties

International audienc