Network appliances perform different functions on network flows and constitute an important part of operator's network. Normally, a set chained process flows. Following the trend virtualization networks, has also become topic interest. We define model for formalizing chaining using context-free language. deployment requests construct virtual function graphs that can be mapped to describe mapping as Mixed Integer Quadratically Constrained Program (MIQCP) finding placement them together...

The field of Wireless Sensor Networks (WSNs) is now in a stage where serious applications societal and economical importance are reach. For example, it well known that the global climate change dramatically influences visual appearance mountain areas like European Alps. Very destructive geological processes may be triggered or intensified, impacting stability slopes, possibly inducing landslides. Unfortunately, interactions between these complex poorly understood. Therefore, one needs to...

In the context of wireless data collection, a common application class in sensor networks, this paper presents novel, non-intrusive algorithm for precise reconstruction packet path, per-hop arrival order and times individual packets from partial in-band information at runtime. Information is reconstructed outside network immediately after received sink. After establishing correctness our proposed algorithm, we evaluate its performance testbed experiments using CTP Dozer, two well-known...

In the near future many more compute resources will be available at different geographical locations. To minimize response time of requests, application servers closer to user can hence used shorten network round trip times. However, this advantage is neutralized if data centre highly loaded as processing requests important well. We model request plus a centre.We present capacitated facility location problem formalization where modelled sojourn queueing model. discuss \emph{Pareto trade-off}...

Many older adults are struggling with understanding spoken language, particularly when background noise interferes comprehension. In the present study, we investigated a potential interaction between two well-known factors associated greater speech-in-noise (SiN) reception thresholds in adults, namely a) lower working memory capacity and b) age-related structural decline of frontal lobe regions. sample (N = 25) younger controls 13) normal pure-tone thresholds, SiN were assessed. Furthermore,...

In this paper, we present a performance analysis of the communication stack PermaDozer application. Our offline is based on long-term data from three diverse real-world wireless sensor network deployments. Two deployments considered are located in Swiss mountains at 3.500 meters a.s.l., third deployment along river midlands. Apart climatic differences, also vary size, density, node placement, and type quantity RF interference. From September 2008 to May 2011 more than 99.6 million WSN...

A current trend in networking and cloud computing is to provide compute resources at widely distributed sites; this exemplified by developments such as network function virtualization. This paves the way for wide-area service deployments with improved quality: e.g., user-perceived response times can be reduced offering services nearby sites. But always assigning users nearest site a bad decision if already highly utilized. paper formalizes two related decisions of allocating different sites...

Within the PermaSense project, two wireless sensor networks have been deployed for a long-term operation in Swiss Alps. For enabling state-of-the-art permafrost research based on collected data, highest possible data quality and yield to be ensured. But, of sensors remains hard problem. Firstly, are subject continuous changes. Second, there scenarios that can only tested field as capabilities testbeds too limited. Basically, it is not test many months before deploying field. In this poster,...

Commercial, coin-sized iButton temperature logger devices are well-suited for densely instrumenting large outdoor areas. An efficient workflow deploying and maintaining those is necessary when striving to deploy operate several hundreds of data devices. Additionally, a sophisticated management required handling the emerging, amounts meta measurement data. Therefore, we developed iAssist, solution that integrates together with GPS receiver digital camera gathering accurate location...

SUMMARY System virtualization has become the enabling technology to manage increasing number of different applications inside data centers. The abstraction from underlying hardware and provision multiple virtual machines (VM) on a single physical server have led consolidation more efficient usage servers. also eases centers, as applied in several cloud computing environments. In this case, application need not adapt environment provider, but can travel around with its own VM image, including...

This paper presents Vizzly, a middleware for the interactive browsing of large sensor network data sets. Provided map and line plot widgets allow to visualize structured from mobile static sensors. A user is completely free in selecting based on time location, suitable levels temporal spatial detail are automatically chosen by Vizzly server. adapts interactions, new loaded when query parameters change. Request response times significantly reduced use caching techniques, most requests served...

In distributed cloud computing, application deployment across multiple sites can improve quality of service. Recent research developed algorithms to find optimal locations for virtual machines. However, those assume have either single-tier applications or a fixed number machines -- strong simplification reality. This paper investigates the placement and scaling complex architectures. An is dynamically scaled fit both current demand situation currently available infrastructure resources. We...

Grid computing enables access to high performance resources by offering unified interfaces compute facilities of distributed centers. These centers are limited in personal capacity and support capabilities for different communities/VOs. This work presents a solution this management problem facilitating the natural interface introduced virtualization separate hardware application provisioning. Any eScience community may provide preconfigured applications within virtual machine images run...

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A current trend in networking and cloud computing is to provide compute resources over widely dispersed places exemplified by initiatives like Network Function Virtualisation. This paves the way for a widespread service deployment can improve quality; nearby server reduce user-perceived response times. But always using nearest bad decision if that already highly utilized. paper investigates optimal assignment of users -- convex capacitated facility location problem with integrated queuing...

In Distributed Cloud Computing, applications are deployed over thousands of geographically distributed cloud sites. This new deployment approach promises not only improved application's quality service but enables deploying network-critical otherwise possible. A previously settled, static allocation enough resources at each site is expensive. Adapting resource allocations during application lifetime could dramatically reduce expenses. They triggered by complex algorithms as a reaction...

In Distributed Cloud Computing, applications are deployed across many data centres at topologically diverse locations to improved network-related quality of service (QoS). As we focus on interactive applications, minimize the latency between users and an application by allocating resources nearby customers. Allocating all will result in best but also highest expenses. So need find optimal subset which reduces expenses - facility location problem (FLP). addition, consider resource capacity...

As the application of WSNs for long-term monitoring purposes becomes real, issue WSN system health grows increasingly important. Manually understanding root causes an observed behavior is time-consuming and difficult, often knowledge prior necessary potential risk on performance. The challenges lie in balance between amount data collected level detail which state can be inferred from this data. In paper, we propose a lightweight runtime logging corresponding network inference mechanism that...

Health monitoring is an integral service for the long-term operation of wireless sensor networks. Instead actively adding probe or status traffic, recently proposed passive health systems infer system solely from existing application traffic. Our results extensive testbed experiments prove that detection rate exemplary significantly improved, i.e., by up to 28% overall 94%, when a estimation method complemented with minimally active component. This paper presents Hybrid Monitoring, novel...