The problem of overbuffering in today’s Internet (termed as bufferbloat) has recently drawn a great amount of attention from the research community. This has led to the development of various active queue management (AQM) schemes. The last years have seen a lot of effort to show the benefits of AQMs over simple tail-drop queuing and to encourage deployment. Yet it is still unknown to what exten...

Active measurement on peer-to-peer system is the best way to provide the real data for the system simulation and optimization. Based on coupon collector’s problem, an optimized tracing model was proposed to guide the active measurement on BitTorrent swarm. With the optimization of lowering expectations and requesting concurrently, the information repetition rate was 67.12 % off, while still cov...

We previously proposeda new version of TCP, called Inline measurement TCP (ImTCP), in [2, 3]. The ImTCP sender adjusts the transmission intervals of data packets and then utilizes the arrival intervals of ACK packets for available bandwidth estimation. This type of active measurement is preferred because the obtained results are as accurate as those of other conventional types of active measure...

Since IPv6 has more benefits over IPv4, the development and deployment of the IPv6 protocol-based products are currently taking place and the migration of IPv4 to IPv6 has also been steadily happen. In these mixed network environment, Network management for both IPv4 and IPv6 is a serious issue. In this paper, we focus on the design and implementation of an active measurement system which can b...

Router queues can impact both round-trip times and throughput. Yet little is publicly known about queue provisioning employed by Internet services providers for the routers that control the access links to home computers. This paper proposes QFind, a black-box measurement technique, as a simple method to approximate the size of the access queue at last mile router. We evaluate QFind through sim...

In this paper we present the active harness, a scalable and versatile means for deep probing of network local states. The approach makes a clear separation between the “communication” from the “information” part of the probing process. The composition of the “information” component is handled by means of network embedded harness plug-ins. It can facilitate not only a new generation of network a...

Performance measurement is an important issue in IP Networks for both ISPs and final users. Active measurement represents an efficient mean of evaluation and an alternative to the important infrastructure investment needed for passive measurement. Nowadays, the increasing complexity of routing mechanisms and the evolution of transport protocols leads to unawareness on the effective routes in th...

The active visual inspection has made giant strides in development. Due to the complexity of field conditions, the binocular stereo vision sensor in active stereo visual inspection system is difficult to acquire the ideal image pair under the poor illumination environment, or cannot work normally because one of two cameras is damaged. To solve the practical problem, a reparability method of the...

The IPv4 address space is small enough to allow exhaustive active measurement, permitting important insight into Internet growth, policy, and evolution. The IPv6 address space, on the other hand, presents the problem that we can no longer perform exhaustive measurements in the same way, inhibiting our ability to continue studying Internet growth. Access to private datasets (e.g., HTTP access lo...

STUDY OBJECTIVE The number of cigarettes smoked per day is an imprecise indicator of exposure to cigarette smoke, and biochemical assessment of exposure is not always feasible. The aim of this study was to develop more accurate measures of self reported active exposure to cigarette smoke. DESIGN Mail survey in 386 smokers, retest at one month in 94 participants (24%), analysis of saliva cotin...