Mehdi Nikkhah

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Transitioning an infrastructure the size of the Internet is no small feat. We are in the midst of such a transition, <i>i.e</i>., from IPv4 to IPv6. IPv6 was standardized 15 years ago, but until recently there were few incentives to adopt it. The allocation of the last large block of IPv4 addresses changed that, and migrating to an IPv6 Internet has become(More)
SUMMARY The purpose of this paper is to present a robust tracking control algorithm for underactuated biped robots capable of self-balancing in the presence of external disturbances. The biped is modeled as a five-link planar robot with four actuators located at hip and knee joints. A sliding mode control law has been developed for the biped to follow a(More)
—The need for a larger Internet address space was acknowledged early on, and a solution (IPv6) standardized years ago. Its adoption has, however, been anything but easy and still faces significant challenges. The situation begs the questions of " why has it been so difficult? " and " what could have been (or still be) done to facilitate this migration? "(More)
This paper documents and to some extent elucidates the progress of IPv6 across major Internet stakeholders since its introduction in the mid 1990s. IPv6 offered an early solution to a well-understood and well-documented problem IPv4 was expected to encounter. In spite of early standardization and awareness of the issue, the Internet's march to IPv6 has been(More)
What determines the eventual success of a protocol? Are certain features or properties more important? Do those vary according to a protocol's type? We explore these questions by applying data mining techniques to a rich repository of protocol specifications; IETF RFCs. While the investigation is still preliminary, some interesting findings have emerged. It(More)
BACKGROUND Obstructive lung disease is a growing health problem, especially in developed countries. This study aimed to compare Impulse Osillometry System (IOS) and Spirometry for evaluation of Chronic Obstructive Pulmonary Disease and asthma. MATERIALS AND METHODS The study groups contained 87 healthy people, 87 asthmatic patients and 56 COPD patients.(More)
The development and adoption of new protocols (or of extensions to existing protocols) is arguably central to the In-ternet's evolution. However and in spite of over 40 years of experience with this process, we have limited understanding of what factors may contribute to a protocol's success. A sound technical design and a well-grounded purpose are(More)
In this study, to model 3D chemotactic tumor-stroma invasion in vitro, we developed an innovative microfluidic chip allowing side-by-side positioning of 3D hydrogel-based matrices. We were able to (1) create a dual matrix architecture that extended in a continuous manner, thus allowing invasion from one 3D matrix to another, and (2) establish distinct(More)
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