Understanding network characteristics is essential to build accurate models necessary to improve the quality of multimedia real time applications. Some performance network parameters such as the round trip time (RTT) can be easily obtained in most cases. However, variables such as one-way delay (OWD) distributions and link capacities may be difficult to estimate without the use of special hardw...

Welding dilution is the chemical composition modification of the weld metal, caused by the portion of base metal that suffers melting and starts to form the fusion zone. Its measure is given by the percentage of the base metal that takes part in the formation of the weld filet, and it varies according to the used welding process, type of join, pre-heat temperature, consumable, parameters of wel...

This memo describes an extension to the Two-Way Active Measurement Protocol (TWAMP). Specifically, it extends the TWAMP-Test protocol, which identifies and manages packet trains, in order to measure capacity metrics like the available path capacity, tight section capacity, and UDP delivery rate in the forward and reverse path directions.

Autonomous navigation of mobile robot requires a ranging system for measurement of distance to environmental objects. It is obvious that the wider and the faster distance measurement gives a mobile robot more freedom in trajectory planning and control. The active omni-directional ranging system proposed in this paper is capable of obtaining the distance for all 3600 directions in real-time beca...

Internet measurement studies often require prolonged probing of remote targets to collect information, yet almost all such studies of which we are aware were undertaken without considering the polluting effects of their unconstrained probing behavior. To help researchers conduct experiments in a more responsible fashion, we present a framework and technique that enables efficient execution of l...

Simultaneous link failures are common in IP networks [1]. In this paper, we develop a technique for locating multiple failures in Service Provider or Enterprise IP networks using active measurement. We propose a two-phased approach that minimizes both the additional traffic due to probe messages and the measurement infrastructure costs. In the first phase, using elements from max-plus algebra t...

This paper presents a software tool for the active measurement of the one-way delay (latency) based on cyclic-path delay method in cloud. The principle consists in sending packets from the source node to every node belonging to a multicast group. Copies of the original packet will be forwarded through every possible path in the network before returning to the source node. The original idea is r...

In recent years, the three dimensional (3D) imaging SAR has been researched as a hot field. Generally, the 3D imaging system can be classified into two types: the curved SAR (CSAR) [1-4] and the linear array SAR (LASAR) [5-6]. The CSAR obtains its 3D resolutions by designing a non-rectilinear flight trajectory of the antenna phase center (APC). The typical CSARcircular SAR [3, 4], researched by...

Measurements and simulations are the main tools for studying the performance of IP networks. Furthermore, active measurement techniques are becoming an integral part of real network performance management systems. But if excessive testing packets are generated and injected into the network, then it might lead to worsening congestion. However, passive monitoring of queue length distributions wil...

As the number of compute cores per chip continues to rise faster than the total amount of available memory, applications will become increasingly starved for memory storage capacity and bandwidth, making the problem of performance optimization even more critical. Also, understanding and optimizing the usage of an increasing number of hierarchical memory levels and complex cache management polic...