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Increased commodity use of mobile devices has the potential to enable mission-critical monitoring applications. However, these mobile-enabled monitoring applications have to often work in environments where a delay-tolerant network (DTN) is the only feasible communication paradigm. Detection of complex (composite) events is fundamental to monitoring applications. However, the existing plan-based CED...
Delay tolerant networks (DTNs), which are wireless networks prone to long delays and frequent disruptions are increasingly becoming common. We are exploring the challenges involved in designing effective event notification framework on DTNs. This paper presents the design and evaluation of a delay-tolerant event notification framework called DATEM based on the philosophy that failures and delays are...
Wildlife sounds provide relevant information for non-intrusive environmental monitoring when Wireless Sensor Networks (WSNs) are used. Thus, collecting such audio data, while maximizing the network lifetime, is a key challenge for WSNs. In this work, we propose a methodology that applies Compressive Sensing (CS) aiming at collecting as little data as possible to allow the signal reconstruction, so...
With the increasing demand for traffic safety and efficiency and constant search for innovative solutions within the automotive market coupled with supporting initiatives from regulatory (governmental) domains, the potential of Intelligent Transportation Systems (ITS) is vast. Basic vehicle and roadside infrastructure collaboration allows an increase in efficiency and safety and acts as the foundation...
Data centers are nowadays ubiquitous, in a worldwide scale, and often geographically dispersed. In such environments, data reliability and availability are enhanced via data redundancy throughout the distributed storage. Because user performance is important in data centers, data updates in such distributed environments are done such that eventual consistency is achieved. In this paper we utilize...
Although there have been a plethora of studies on TCP performance in supporting of various applications, relatively little is known about the interaction between TCP and BGP, which is a specific application running on top of TCP. This paper investigates BGP's slow route propagation by analyzing packet traces collected from a large ISP and Route Views Oregon collector. In particular we focus on the...
Data replication is a well-known strategy to achieve the availability, scalability and performance improvement goals in the data management world. However, the cost of maintaining several database replicas always strongly consistent is very high. The CAP theorem shows that a shared-data system can choose at most two out of three properties: consistency, availability, and tolerance to partitions....
State monitoring is widely used for detecting critical events and abnormalities of distributed systems. As the scale of such systems grows and the degree of workload consolidation increases in Cloud data centers, node failures and performance interferences, especially transient ones, become the norm rather than the exception. Hence, distributed state monitoring tasks are often exposed to impaired...
A Service-Based Application (SBA) is built by defining a workflow that composes and coordinates different Web services available via the Internet. In the context of on-demand SBA execution, suitable services are selected and integrated at runtime to meet different non-functional requirements (such as price and execution time). In such dynamic and distributed environment, an important issue is to guarantee...
Considering physical sensors with certain sensing capabilities in an Internet-of-Things (IoT) sensory environment, in this paper, we propose an efficient energy management framework to control the duty cycles of these sensors under quality-of-information (QoI) experience in a multi-task-oriented IoT sensory environment. Contrary to past research efforts, our proposal is transparent and compatible...
Service providers are experiencing a challenge that is caused by the explosive growth in demand for high-speed connections to and across metropolitan, regional and core networks. Operators are under pressure to increase the capacity of their networks to meet these ever growing requirements. To improve service agility and network efficiency and reduce costs throughout their entire infrastructures,...
HTTP Adaptive Streaming (HAS) is rapidly becoming a key video delivery technology for fixed and mobile networks. However, today there is no solution that allows network operators or CDN providers to perform network-based QoE monitoring for HAS sessions. We present a HAS QoE monitoring system, based on data collected in the network, without monitoring information from the client. To retrieve the major...
Network resources are often limited, so how to use them efficiently is an issue that arises in many important scenarios. Many recent proposals rely on a central controller to carefully orchestrate resources across multiple network locations. The central controller gathers network information and relative levels of usage of different resources and calculates optimized task allocation arrangements to...
In order to access to the time-Delay Performance of the Wireless Sensor Network, respectively preformed the time-delay experiment, simulation and theoretical analysis from the following aspects: the hops and hop spacing, MAC dormancy mechanism, back-off time and transmitted power, etc. Obtained the relations between the time-delay and the above factors. Systematically summed up the time-delay rules...
In this paper, we present the use of a system aimed at improving the productivity of equipment, piloted at an Intel production facility for 300mm 45nm high volume manufacturing. We show that true toolset utilizations may be significantly lower than what is recorded, owing to various process and tool-related delays that occur during the tool ‘busy’ or ‘running’ state. We then demonstrate through a...
Sensor networks are exposed to hostile environments that may cause failures of single nodes and communication links which affect the whole network. Localizing the cause of the problem in space and time requires to collect diagnostic data from the network. Due to resource and energy constraints, however, it is not possible to continuously collect detailed diagnostic data from all nodes. We therefore...
Abstract: In view of using symmetrical normalization for smaller deviation than standard normalization for the multi-tau photon correlator in the whole delay time range but need more monitor channels. We suggest employing symmetrical normalization when the lag time larger than 16384 and standard normalization smaller than 16384. Deviation of symmetrical normalization and standard normalization was...
An important characteristic in trust management frameworks is how nodes obtain information about the trustworthiness of other nodes. Some trust management models are based on local information, while others use both information of neighbors and remote nodes. Despite the wide of information used, the existing trust monitoring approaches are mainly based either on passive monitoring mechanisms or on...
Body Area Networks (BANs), targeting everywhere anytime health monitoring, operate in license-exempt frequency bands. They require a cross layer design that jointly considers the requirements of (1) access delay to the medium and (2) packet delivery ratio (PDR). In this paper, we experimentally evaluate the PDR of a BAN under static and dynamic scheduling schemes. Investigations show that static multi-hop...
Today's competitive business climate and the complexity of IT environments dictate efficient and cost effective service delivery and support of IT services. This is largely achieved through automating of routine maintenance procedures including problem detection, determination and resolution. System monitoring provides effective and reliable means for problem detection. Coupled with automated ticket...
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