Moshe Laifenfeld

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Objective testing of centerline extraction accuracy in quantitative coronary angiography (QCA) algorithms is a very difficult task. Standard tools for this task are not yet available. We present a simulation tool that generates synthetic angiographic images of a single coronary artery with predetermined centerline and diameter function. This simulation tool(More)
The identifying code problem for a given graph involves finding a minimum set of vertices whose neighborhoods uniquely overlap at any given graph vertex. Initially introduced in 1998, this problem has demonstrated its fundamental nature through a wide variety of applications, such as fault diagnosis, location detection, and environmental monitoring, in(More)
Wireless Sensor Networks (WSNs) provide an important means of monitoring the physical world, but their limitations present challenges to fundamental network services such as routing. In this work we utilize an abstraction of WSNs based on the theory of identifying codes. This abstraction has been useful in recent literature for a number of important(More)
We propose a peer-to-peer architecture designed to overcome asymmetries in upload/download speeds that are typical in end-user dialup, broadband and cellular wireless internet connections. Our approach allows users at remote locations to access information stored on their home computers at rates often exceeding their home connection's upload capacity. The(More)
—We experimentally investigate the benefits of multi-hop networking for intra-car data aggregation under the current state-of-the-art Collection Tree Protocol (CTP). We show how this protocol actively adjusts collection routes according to channel dynamics in various practical car environments, resulting in performance gains over single-hop aggregation.(More)
—Modern vehicles incorporate dozens of sensors to provide vital sensor data to the electronic control units (ECUs), typically through physical wires, which increase the weight, maintenance , and cost of cars. Wireless sensor networks (WSN) have been contemplated for replacing the current physical wires with wireless links, although existing networks are all(More)
The demand for higher data rates and the scarce spectrum resources drive the adoption of collab-orative communication techniques. In this work we shown that the existing cluster based collaborative schemes can be greatly improved in terms of both the achievable performance, and complexity, by allowing overlapping across clusters. Further improvement is(More)
—With the emergence of connected and autonomous vehicles, sensors are increasingly deployed within cars to support new functionalities. Traffic generated by these sensors congest traditional intra-car networks, such as CAN buses. Furthermore, the large amount of wires needed to connect sensors makes it harder to design cars in a modular way. To alleviate(More)
We consider the general problem of distributed and fair peer-to-peer (p2p) allocation of a common, refillable resource. This problem recurrs in a number of scenarios, for example grid computing, content distribution, Internet Service Provider service sharing, and file sharing over asymmetric channels. We present several distributed schemes for this(More)
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