routing in wireless sensor networks (wsns) is a very challenging task due to the large number of nodes, their mobility and lack of proper infrastructure. since the sensors are battery powered devices, energy efficiency is considered as one of the main factors in designing routing protocols in wsns. most of energy-aware routing protocols are mere energy savers that attempt to decrease the energy...

Linux Virtual Server (LVS) is an open source technology which can be used to construct a scalable and highly available server using a collection of real servers. LVS load balances a variety of network services among multiple machines by manipulating packets as they are processed by the Linux TCP/IP stack. One of the most common roles for LVS is to act as a front end to a farm of web servers. Th...

When processing large medical imaging studies, adopting high performance grid computing resources rapidly becomes important. We recently presented a "medical image processing-as-a-service" grid framework that offers promise in utilizing the Apache Hadoop ecosystem and HBase for data colocation by moving computation close to medical image storage. However, the framework has not yet proven to be ...

Load balancing (LB) is crucial for the efficient operation of big server clusters. In the past, many different LB strategies on the request level have been developed with great effectiveness in parallel applications. However, the LB problem is not yet solved completely; new applications and architectures require new features. In particular, secure environments require that LB is done at session...

In multi-server distributed queueing systems, the access of stochastically arriving jobs to resourcesis often regulated by a dispatcher, also known as load balancer. A fundamental problem consists indesigning a load balancing algorithm that minimizes the delays experienced by jobs. During the last twodecades, the power-of-d-choice algorithm, based on the idea of dispatching each...

Coming wireless communication standards like Long Term Evolution (LTE) promise to bring a drastic increase in data rate for the end user. To facilitate this evolution, sophisticated technology for the mobile equipment is required. Most research focuses on the signal processing in the physical layer whereas the computational capabilities for protocol processing are neglected. This paper describe...

Distributed key-value systems have been widely used as elemental components of many Internet-scale services at sites such as Amazon, Facebook and Twitter. This thesis examines a system design approach to scale existing key-value systems, both horizontally and vertically, by carefully engineering and integrating techniques that are grounded in recent theory but also informed by underlying archit...