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Nowadays, with the expansion of virtual spaces, interactions between anonymous users have also increased. These interactions can provide new opportunities and threats for users of this virtual spaces. One way to reduce these threats in such spaces is to use feedback-based reputation systems to estimate the trustworthiness of users. However, the feedback-based reputation systems are known to be particularly...
Anomaly traffic detection is one method to detect attack in internet, especially Distributed Denial of Service (DDoS). Here, traffic analysis which reveal the observed traffic pattern is key important process as the anomaly decision was taken based on traffic analysis. This research analyzed several statistical analysis of traffic datasets categorized as normal, DDoS attack and flashcrowd. Analysis...
The application of questionnaires to assess the anxiety of patients provides a lot of information that can guide the dental physician in assessing the patient's behaviour prior to addressing specific treatments, but also to find new strategies in the management of dental anxiety behaviour. There is a great variety of self-reported dental anxiety assessments which can be applied, but the most used...
Statistical analysis of medical data plays significant role in medical diagnostics development. However in many cases the statistics is not effective enough. In the paper we consider combining statistical inference with clustering in the preprocessing phase of data analysis. The proposed methodology is checked on cardiovascular data and used for developing methods of early diagnosis of hypertension...
When software developers fail to coordinate, build failures, duplication of work, schedule slips and software defects can result. However, developers are often unaware of when they need to coordinate, and existing methods and tools that help make developers aware of their coordination needs do not provide timely or efficient recommendations. We describe our techniques to identify timely and efficient...
Do statistical methods developed for NRZ signals work for PAM-4 modulation? Not entirely. We show that some basic principles (e.g., edge-based analysis, conversion of jitter PDF into vertical noise) remain valid, but the solution flow should be modified. Modifications include: the number of PMF accumulators, their initialization and input-output connections, weight factors, transition probabilities,...
The aim of this paper is to remove the Gaussian Noise present in seismic signals obtained in the Llaima volcano, one of the most active volcanoes in Chile. In order to classify subsequently, the methods used to clean the seismic signals are usually band pass Butterworth filter for its low ripple to reduce interference from other sources of mechanical energy to provide low frequency components. However,...
This paper tackles a statistical analysis of bistatic sea radar clutter data acquired by an experimental demonstrator developed by the University of Alcalá, based on DVB-T signals. The selected scenario is located at the Military Naval School of Marín, in the Spanish North-west coast. Goodness-off-it techniques are used to fit the empirical cumulative distribution function to theoretical models, and...
This paper applies stochastic geometry to model the distribution of downlink transmit power in macro base stations in mobile networks. Using data from cellular 3G deployments in the UK, we find, through hypothesis tests, that the maximum transmit powers of base stations in urban environments are independent of both the local density of base stations and the transmit power of adjacent base stations...
Software bugs contribute to the cost of ownership for consumers in a software-driven society and can potentially lead to devastating failures. Software testing, including functional testing and structural testing, remains a common method for uncovering faults and assessing dependability of software systems. To enhance testing effectiveness, the developed artifacts (requirements, code) must be designed...
Users mobility is a crucial issue in cellular networks. For example, during the same call, users may go through different cells/networks, triggering handover procedures, which is most likely a source of call drops. In this paper, we take advantage of statistical methods for the processing of the handover data, such as outgoing and incoming handover (OH and IH), in order to highlight correlation between...
The difference in statistical scales will bring different statistical results, so it is important and necessary to select statistical grids for the geographical conditions information statistics. This paper proposes a method of selecting statistical scale of geographical information with spatial autocorrelation being taken into account. By using geographic conditions census data and taking building...
Bug fixing is one of the most important activities in software development and maintenance. A software project often employs an issue tracking system such as Bugzilla to store and manage their bugs. In the issue tracking system, many bugs are invalid but take unnecessary efforts to identify them. In this paper, we mainly focus on bug fixing rate, i.e., The proportion of the fixed bugs in the reported...
In isolated electricity networks the penetration of renewable energy sources offers, among others, the advantage of distributed electricity. At the same time, as penetration levels increase, controls and regulations need to be imposed in order to alleviate rising grid integration issues. Some of these can be prevented through the use of dynamic tariffs enabling Demand Side Management. In this work,...
Mobile marketing is a relatively easy and inexpensive way to promote products. This paper evaluates influential factors that motivate consumers in responding to mobile marketing with the consideration of context receiving time and location. A mobile marketing context model, with Technology acceptance model (TAM) and Commitment-trust Theory being adopted, is developed to facilitate purchasing intention...
This paper analyzes the impact on compensating for Type-I errors in video quality assessment. A Type-I error is to incorrectly conclude that there is an effect. The risk increases with the number of comparisons that are performed in statistical tests. Type-I errors are an issue often neglected in Quality of Experience and video quality assessment analysis. Examples are given for the analysis of subjective...
Detection of Sleep onset is one of complex processes in the area of sleep medicine. The transition from wake state to sleep is termed as sleep onset and is identified using distinct markers like behavioural features, physiological features and changes in EEC Extraction of appropriate features from EEG recordings helps in automated recognition and classification of wake-sleep transition. This research...
In 2011, Taiwan officially implements 12-year basic education. Problems arise due to lack of time to conduct planning and relevant empirical study. It requires respective endeavor from the academic circle to resolve the 12-year basic education plight via empirical study. The study first concentrates on the following five questions to conduct empirical study and provide future reference for the education...
In the modern enterprise system, business management and ownership are separate. Thus, the agency relationship comes out. Under the asymmetric and insufficient information, the manager would be contrary to the pursuit of business objectives and maximize their own interests, resulting in agency costs. Western countries have been respected that debt financing plays very good constraint on managers,...
Through taking the county level as the unit, per capita GDP, net income of the rural households and disposable income of urban residents as the evaluation indexes, and 42 counties in Yunnan central urban agglomeration as the research objects, the spatial-temporal pattern difference of Yunnan central urban agglomeration's economy from 2002 to 2011 is studied in this paper based on Geoda and ArcGIS...
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