scholarly journals UDP Checksum Complement in the One-Way Active Measurement Protocol (OWAMP) and Two-Way Active Measurement Protocol (TWAMP)

2016 ◽  
Author(s):  
T. Mizrahi
2021 ◽  
Author(s):  
G. Mirsky ◽  
X. Min ◽  
H. Nydell ◽  
R. Foote ◽  
A. Masputra ◽  
...  

2015 ◽  
Author(s):  
Carlos Lamb ◽  
Jéferson Nobre

Redes Tolerantes a Atrasos/Desconexões (Delay/Disruption Tolerant Networks - DTNs) podem ser caracterizadas por altos atrasos e desconexões entre os nós participantes. Apesar dessas características, as DTNs necessitam de funcionalidades de gerenciamento de redes semelhantes àquelas encontradas nas redes convencionais, como, por exemplo, monitoramento da latência na troca de mensagens. Uma das abordagens mais utilizadas para tal monitoramento é o emprego de protocolos padronizados para medições ativas, como, por exemplo, o Two-Way Active Measurement Protocol (TWAMP). No entanto, protocolos como o TWAMP não estão preparados para as DTNs, já que consideram ambientes de rede convencionais, como a Internet. O presente trabalho descreve o Delay/Disruption Two-Way Active Measurement Protocol (DTWAMP), uma proposta para a realização de medições ativas em DTNs. Além disso, experimentos foram realizados a fim de avaliar a solução proposta. Os resultados obtidos demonstram que o DTWAMP possui propriedades desejáveis para a execução de tarefas de monitoramento em DTNs.


Coatings ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 749 ◽  
Author(s):  
Francisco Buendía-Martínez ◽  
Aránzazu Fernández-García ◽  
Florian Sutter ◽  
Loreto Valenzuela ◽  
Alejandro García-Segura

The corrosion of the reflective layer is one of the main degradation mechanisms of solar reflectors. However, the appropriate assessment of the corroded reflector samples is not accomplished by the current analysis techniques. On the one hand, the reflectance measurement protocol of non-damaged solar reflectors for concentrating solar thermal technologies is widely addressed in the SolarPACES reflectance guideline. However, this methodology is not adequate for reflectors whose surface is partially corroded by many kind of corrosion agents. In this work, a new measurement technique to properly assess corroded samples was developed. To check the usefulness of the method, several damaged samples (subjected to two accelerated aging tests) were evaluated with the conventional technique and with the improved one. The results showed that a significant discrepancy is observed between the two methods for heavily corroded samples, with average reflectance differences of 0.053 ppt. The visualization of the reflector images illustrated that the improved method is more reliable. On the other hand, both the corrosion products formed and the corrosion rates were identified after each corrosive test. The chemical atmosphere significantly affects the products formed, whereas the corrosion rates are influenced by the test conditions and the reflector quality.


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