Search results for "DOM"
showing 10 items of 12668 documents
Short-Time Non-work-related Computing and Creative Performance
2014
It has been argued that non-work-related computing (NWRC) takes time away from work and, hence, decreases work productivity. On the other hand, it has also been claimed that short-time non-work-related computing (STNWRC) (a maximum of 15 minutes), has a positive impact on work productivity, including relief from boredom, higher creativity, and the underlying recovery mechanisms. To examine the impact of STNWRC on creative performance, we draw on Fredrickson's broaden-and-build theory, the concept of recovery with mental well-being and low cognitive effort. A 2 × 2 factorial experiment with 40 subjects was conducted. The results indicate that STNWRC has a positive effect on creative performa…
An Efficient Network Log Anomaly Detection System Using Random Projection Dimensionality Reduction
2014
Network traffic is increasing all the time and network services are becoming more complex and vulnerable. To protect these networks, intrusion detection systems are used. Signature-based intrusion detection cannot find previously unknown attacks, which is why anomaly detection is needed. However, many new systems are slow and complicated. We propose a log anomaly detection framework which aims to facilitate quick anomaly detection and also provide visualizations of the network traffic structure. The system preprocesses network logs into a numerical data matrix, reduces the dimensionality of this matrix using random projection and uses Mahalanobis distance to find outliers and calculate an a…
Data mining framework for random access failure detection in LTE networks
2014
Sleeping cell problem is a particular type of cell degradation. There are various software and hardware reasons that might cause such kind of cell outage. In this study a cell becomes sleeping because of Random Access Channel (RACH) failure. This kind of network problem can appear due to misconfiguration, excessive load or software/firmware problem at the Base Station (BS). In practice such failure might cause network performance degradation, which is hardly traceable by an operator. In this paper we present a data mining based framework for the detection of problematic cells. In its core is the analysis of event sequences reported by a User Equipment (UE) to a serving BS. The choice of N i…
The influence of dataset size on the performance of cell outage detection approach in LTE-A networks
2015
The configuration and maintenance of constantly evolving mobile cellular networks are getting more and more complex and hence expensive. Self-Organizing Networks (SON) concept is an umbrella term for the set of automated solutions for network operations proposed by 3rd Generation Partnership Project (3GPP) group. Automated cell outage detection is one of the components of SON functionality. In early studies our research group developed data-driven approach for the detection of malfunctioning cells. In this paper we investigate the performance of the proposed solution as a function of the density of active users and the size of observation interval. The evaluation is conducted in Long Term E…
Coupling high-resolution satellite imagery with ALS-based canopy height model and digital elevation model in object-based boreal forest habitat type …
2014
We developed a classification workflow for boreal forest habitat type mapping. In object-based image analysis framework, Fractal Net Evolution Approach segmentation was combined with random forest classification. High-resolution WorldView-2 imagery was coupled with ALS based canopy height model and digital terrain model. We calculated several features (e.g. spectral, textural and topographic) per image object from the used datasets. We tested different feature set alternatives; a classification accuracy of 78.0 % was obtained when all features were used. The highest classification accuracy (79.1 %) was obtained when the amount of features was reduced from the initial 328 to the 100 most imp…
Institutional Autonomy and Academic Freedom in the Nordic Context — Similarities and Differences
2013
Owing to their common history, similarities in language and culture, long traditions in political collaboration and the shared Nordic societal model, an assumption is often made that the operational and regulatory context of universities is similar in the five Nordic countries: Denmark, Finland, Iceland, Norway and Sweden. In this article, we examine the relationship between the Nordic higher education institutions and their specific governments. The interpretation of institutional autonomy and academic freedom in the Nordic countries is discussed with support from recently collected empirical data, Nordic university legislation and the topical research literature. We describe the differenc…
End-users Co-create Shared Information for a More Complete Real-time Maritime Picture
2017
European Union Member States are working towards an integrated maritime surveillance and deeper information sharing and implementation of Common Information Sharing Environment. Value networks aiming at co-creation, need active facilitation, and relevant platforms for open cooperation. This study analysed scenario analytics, and narrative documents from projects CoopP, CISE, and MARISA by using a Data Extraction Table to classify both objects and phenomenon relevant to European maritime information sharing systems. The object and phenomenon rows are grouped under a European Coast Guard Functions, CGFs framework, to better understand their occurrence and interdependencies. This paper finds t…
Krāpšanas izmeklēšanas kriminālistiskais aspekts
2016
Maģistra darba tēma ir „Krāpšanas izmeklēšanas kriminālistiskais aspekts”. Neskatoties uz to, ka krāpšanas gadījumi aizņem diezgan mazu daļu no valstī reģistrētajiem noziedzīgajiem nodarījumiem pret īpašumu, prakse parāda, ka cietušo no krāpšanām personu zaudējumi sastāda ievērojamo apmēru. Krāpšanai raksturīga niānse – tas ir latents nodarījums. Šis apstāklis bieži ir pamatojams ar cietušo krāpšanās personības īpatnībām. Proti, ar cietušo mantkārību, tieksmi iegūt peļņu bez jebkādiem fiziskā vai intelektuālā darba ieguldūjumiem vai pat uz citu personu rēķina. Krāpšanas īstenošanas paņēmiens un cietušo personību īpatnības lielā mērā ietekmē arī krāpšanas izmeklēšanu. Juridiskajā literatūrā …
From influencee to influencer : the rhizomatic target audience of the cyber domain
2015
The messages of an influence operation are interpreted in a variety of ways by their receivers. To increase the probability of success, these messages are typically tailored to affect a defined group, a target audience. Target audience analysis (TAA) is a process of finding suitable target audiences for influence operations. There are multiple ways of completing the task, ranging from fast and intuitive to complex multi-staged processes. These processes use the information available at the moment of making presumptions about the effectiveness of competing approaches in order to choose those with best end results. The internet presents a challenge to this type of sequential, linear process b…
Branching Ratios and Spectral Functions of $\tau$ Decays: final ALEPH measurements and physics implications
2005
The full LEP-1 data set collected with the ALEPH detector at the $Z$ pole during 1991-1995 is analysed in order to measure the $\tau$ decay branching fractions. Extensive systematic studies are performed, in order to match the large statistics of the data sample corresponding to over 300 000 measured and identified $\tau$ decays. Branching fractions are obtained for the two leptonic channels and eleven hadronic channels defined by their respective numbers of charged particles and $\pi^0$'s. Using previously published ALEPH results on final states with charged and neutral kaons, corrections are applied to the hadronic channels to derive branching ratios for exclusive final states without kao…