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Defect prediction has been the subject of a great deal of research over the last two decades. Despite this research it is increasingly clear that defect prediction has not transferred into industrial practice. One of the reasons defect prediction remains a largely academic activity is that there are no defect prediction tools that developers can use during their day-to-day development activities....
Adaptive random testing, which is an enhanced random testing technique, has been studied for over 10 years. This paper aims to research the influence of the distance problems on the performance of adaptive random testing, where we focus on its efficiency of fault detecting. Experimental results suggest that, the fault detecting ability of adaptive random testing is influenced by the distance calculation...
The transition from voice to data services has led to new trends in telecommunication business, and therefore the need to adjust legacy metrics and KPIs (Key Performance Indicators) that aims to point out the effects of these changes. In this paper, we give the review of development trends of new KPIs that provide greater insight into the use of data based services, as well as estimating the share...
Satellite services in the High North are utilized extensively for both communication purposes and for earth and climate observations. This paper presents results of two year measurements at 20 GHz and co-sited meteorological data. The results suggest that with 7–8 dB margin, services can be provided with 99 % availability for systems with elevation angles as low as 3.2° and 3 dB for elevation angles...
The node replica attack is known to be dangerous to wireless sensor networks (WSNs) because it enables the adversary to extend the damage throughout the network with very low cost. To stop such attack, we propose a similarity estimation based scheme with group deployment knowledge. Compared with prior works, our proposal provides extra functionality that prevent replica from generating false location...
This paper is devoted to the numerical investigation of the availability improvement method at cloud service systems. It was also proved that using proposed approach and algorithm promotes us to determine structural-topological changes operatively in dynamics. It allows improving workload balancing in the servicing nodes, avoiding the proximity of workflows and components of complex services to structural...
Point-wise Mutual Information(PMI) has been widely used in many areas of lexicon construction, term extraction and text mining. However, PMI has a well-known tendency, which is overvaluing the relatedness of word pairs that involve low-frequency words. To overcome this limitation, Expected Point-wise Mutual Information (PMIK) has been proposed empirically. In this paper, we propose an automatic term...
We optimally formulate the problem of maximizing the sustainability in a backbone network, with the goal of balancing network energy savings, device fixing costs, and users utility. Results show that the proposed solution is able to increase the operator revenue, while both a classical energy-saving approach and an always on solution tend to increase the operator costs.
The rapid growth of high-speed transit systems, such as High Speed Rail (HSR), is putting considerable pressure on TCP-based data transmission. It is well known that TCP is suffering from severe throughput degradation in high-speed mobility scenarios. The root cause at the transport layer however remains unclear and largely undetermined to date. In this paper, we aim to pinpoint the throughput bottlenecks...
Telecom sector is in the middle of a global transformation. Drivers for this are changes in customer behavior and in the telecom industry itself. Today CSPs need a more sophisticated, real-time view of performance that provides a deeper understanding of how customers are using and experiencing specific services. Moving from network-centric toward customer-centric operations and introduction of Customer...
In this paper, we consider Heterogeneous Cloud Radio Access Network (H-CRAN) with non-uniform Device-to-Device (D2D) communication. Specifically, D2D transmission are only utilized outside a prescribed distance from any high power node (HPN). Based on the analytical framework provided in this paper, the average ergodic rate of a typical user equipment (UE) is characterized. Through appropriate definition...
In this paper we study the association performance of a small cell base station (SBS) when mobile users (MUs) are randomly located around the said SBS according to a homogeneous Poisson point process. In the analysis, we consider noise only, interference-plus-noise, and interference-limited systems. For each case of association metric, a closed form expression for the outage probability of a randomly...
Passive intermodulation products may occur when two or more carriers are transmitted through a passive device such as a filter, a transmission line or an antenna or if they are reflected from one object. These products are generally due to distributed non-linearity along the transmission path or the reflector of the antenna. We show that ray optics can be used to determine easily the directions in...
In this competitive world, business is becoming highly saturated. Especially, the field of telecommunication faces complex challenges due to a number of vibrant competitive service providers. Therefore, it has become very difficult for them to retain existing customers. Since the cost of acquiring new customers is much higher than the cost of retaining the existing customers, it is the time for the...
The need to assess internet performance from the user's perspective grows, as does the interest in deployment of Large-Scale Measurement Platforms (LMAPs). The potential of these platforms as a real-time network diagnostic tool is limited by the volume, velocity and variety of the data they generated. Fusing this data from multiple sources and generating a single piece of coherent information about...
Sensing coverage in wireless sensor network is one of the vital performance metrics which can arise in all design stages and usually considered together with some other performance metrics, such as connectivity or energy consumption. Whatever the metrics, the fundamental problem is to know at least how many sensors are needed to maintain both sensing coverage and network connectivity. In this paper,...
This contribution reports on the development of a performance index and underlying market model with application to broadband developments in the European Union. The Structure–Conduct–Performance paradigm provides the theoretical grounding. Structural equations modelling was applied to determine the statistically significant factors and components in the path model. The data set was derived from public...
Some Telco customers have multiple "Subscriber-Identity-Modules" or SIM cards across competing mobile operators or within the same operator. Multi-SIM detection is beneficial to telecommunications operators in tuning campaigns, acquiring usage from competitors, and retaining customers. The goal was to develop and materialize the techniques required to build a model for detecting such customers,...
In the last decade, the Internet telecommunication companies are growing rapidly and now are based on the cloud computing environments. Management of a big distributed production infrastructure with multiple business services requires a centralized control system. This paper describes how the Zabbix enterprise-class monitoring system can be used as an adaptive solution for the purpose of real-time...
Social influence is a measure of how people, directly or indirectly, effect the thoughts, feelings and actions of others. As in various environments different possibilities for interactions among people exist, the definition and calculation of social influence vary as well. In this paper, we study social influence in the environment of the “modern information and communication technology (ICT) user”,...
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