Botnet Behavior Detection using Network Synchronism

2011 ◽  
pp. 122-144 ◽  
Author(s):  
Sebastián García ◽  
Alejandro Zunino ◽  
Marcelo Campo
Keyword(s):  
Time Windows ◽  
Expectation Maximization Algorithm ◽  
Error Rates ◽  
Behavioral Characteristics ◽  
Specific Time ◽  
False Positive Error ◽  
Behavior Detection ◽  
Specific Protocol ◽  
False Positive Error Rate ◽  
Analysis Of Error

Botnets’ diversity and dynamism challenge detection and classification algorithms depend heavily on static or protocol-dependant features. Several methods showing promising results were proposed using behavioral-based approaches. The authors conducted an analysis of botnets’ and bots’ most inherent characteristics such as synchronism and network load within specific time windows to detect them more efficiently. By not relying on any specific protocol, our proposed approach detects infected computers by clustering bots’ network behavioral characteristics using the Expectation-Maximization algorithm. An encouraging false positive error rate of 0.7% shows that bots’ traffic can be accurately separated by our approach by analyzing several bots and non-botnet network captures and applying a detailed analysis of error rates.

Errors in prostate core biopsy diagnosis in an era of specialisation and double reporting

2020 ◽  
pp. jclinpath-2020-206726
Author(s):  
Cornelia Margaret Szecsei ◽  
Jon D Oxley
Keyword(s):  
Error Rate ◽  
False Positive ◽  
Core Biopsy ◽  
False Negative ◽  
Diagnostic Error ◽  
Error Rates ◽  
False Positive Error ◽  
Biopsy Diagnosis ◽  
False Negative Error ◽  
False Positive Error Rate

AimTo examine the effects of specialist reporting on error rates in prostate core biopsy diagnosis.MethodBiopsies were reported by eight specialist uropathologists over 3 years. New cancer diagnoses were double-reported and all biopsies were reviewed for the multidisciplinary team (MDT) meeting. Diagnostic alterations were recorded in supplementary reports and error rates were compared with a decade previously.Results2600 biopsies were reported. 64.1% contained adenocarcinoma, a 19.7% increase. The false-positive error rate had reduced from 0.4% to 0.06%. The false-negative error rate had increased from 1.5% to 1.8%, but represented fewer absolute errors due to increased cancer incidence.ConclusionsSpecialisation and double-reporting have reduced false-positive errors. MDT review of negative cores continues to identify a very low number of false-negative errors. Our data represents a ‘gold standard’ for prostate biopsy diagnostic error rates. Increased use of MRI-targeted biopsies may alter error rates and their future clinical significance.

Forensic science evidence: Naive estimates of false positive error rates and reliability

2020 ◽  
Author(s):  
Kristy Martire ◽  
Agnes Bali ◽  
Kaye Ballantyne ◽  
Gary Edmond ◽  
Richard Kemp ◽  
...  
Keyword(s):  
Forensic Science ◽  
False Positive ◽  
Error Rates ◽  
Forensic Sciences ◽  
Positive Error ◽  
False Positive Error ◽  
Reliability Estimates ◽  
Positive Report ◽  
Science Evidence ◽  
Science Disciplines

We do not know how often false positive reports are made in a range of forensic science disciplines. In the absence of this information it is important to understand the naive beliefs held by potential jurors about forensic science evidence reliability. It is these beliefs that will shape evaluations at trial. This descriptive study adds to our knowledge about naive beliefs by: 1) measuring jury-eligible (lay) perceptions of reliability for the largest range of forensic science disciplines to date, over three waves of data collection between 2011 and 2016 (n = 674); 2) calibrating reliability ratings with false positive report estimates; and 3) comparing lay reliability estimates with those of an opportunity sample of forensic practitioners (n = 53). Overall the data suggest that both jury-eligible participants and practitioners consider forensic evidence highly reliable. When compared to best or plausible estimates of reliability and error in the forensic sciences these views appear to overestimate reliability and underestimate the frequency of false positive errors. This result highlights the importance of collecting and disseminating empirically derived estimates of false positive error rates to ensure that practitioners and potential jurors have a realistic impression of the value of forensic science evidence.

Syllable weight in monolingual and heritage Spanish

2018 ◽  
Vol 11 (2) ◽  
pp. 395-427
Author(s):  
Michael Shelton ◽  
Hannah Grant
Keyword(s):  
Reading Proficiency ◽  
Naming Task ◽  
Error Rates ◽  
General Effect ◽  
Heritage Speakers ◽  
Stress Assignment ◽  
Syllable Weight ◽  
Bilingual Speakers ◽  
Quantity Sensitivity ◽  
Analysis Of Error

AbstractThis study presents two experiments employing a naming task that test the modulation of stress assignment by syllable structure in Spanish. The first replicates the findings of a previous study in which words containing arguably heavy penultimate diphthongs provoke higher error rates than putatively light monophthong controls when marked for antepenultimate stress. This result is interpreted as support for quantity sensitivity in the language. This experiment also replicates a subtler finding of differential patterning between rising and falling diphthong in their interaction with Spanish stress, suggesting gradient sensitivity to patterns in the lexicon. The second experiment presents the results of an identical task with Spanish-English heritage speakers in which the general effect of syllable weight is replicated, while the effect of diphthong type does not emerge. An analysis of error types suggests that varying levels of reading proficiency among heritage speakers may have led to the lack of the latter result, while still revealing sensitivity to frequencies in the lexicon. The combined results are offered as further evidence of quantity sensitivity among both monolingual and bilingual speakers of Spanish and provide further data in the understudied subfield of heritage phonotactics.

Reverse Optical Trawling for Synaptic Connections In Situ

2009 ◽  
Vol 102 (1) ◽  
pp. 636-643 ◽  
Author(s):  
Takuya Sasaki ◽  
Genki Minamisawa ◽  
Naoya Takahashi ◽  
Norio Matsuki ◽  
Yuji Ikegaya
Keyword(s):  
Network Connectivity ◽  
Synaptic Activity ◽  
Calcium Transients ◽  
Synaptic Connections ◽  
False Positive Error ◽  
Presynaptic Neuron ◽  
Promising Tool ◽  
On Line ◽  
False Positive Error Rate ◽  
Presynaptic Neurons

We introduce a new method to unveil the network connectivity among dozens of neurons in brain slice preparations. While synaptic inputs were whole cell recorded from given postsynaptic neurons, the spatiotemporal firing patterns of presynaptic neuron candidates were monitored en masse with functional multineuron calcium imaging, an optical technique that records action potential–evoked somatic calcium transients with single-cell resolution. By statistically screening the neurons that exhibited calcium transients immediately before the postsynaptic inputs, we identified the presynaptic cells that made synaptic connections onto the patch-clamped neurons. To enhance the detection power, we devised the following points: 1) [K+]e was lowered and [Ca2+]e and [Mg2+]e were elevated, to reduce background synaptic activity and minimize the failure rate of synaptic transmission; and 2) a small fraction of presynaptic neurons was specifically activated by glutamate applied iontophoretically through a glass pipette that was moved to survey the presynaptic network of interest (“trawling”). Then we could theoretically detect 96% of presynaptic neurons activated in the imaged regions with a 1% false-positive error rate. This on-line probing technique would be a promising tool in the study of the wiring topography of neuronal circuits.

Error Rates in Competency Testing When Test Retaking Is Permitted

1990 ◽  
Vol 15 (1) ◽  
pp. 39-52 ◽  
Author(s):  
Huynh Huynh
Keyword(s):  
Conditional Probability ◽  
False Positive ◽  
False Negative ◽  
Error Rates ◽  
Rasch Models ◽  
Positive Error ◽  
False Positive Error ◽  
Competency Testing ◽  
Negative Error ◽  
False Negative Error

False positive and false negative error rates are studied for competency testing where examinees are permitted to retake the test if they fail to pass. Formulae are provided for the beta-binomial and Rasch models, and estimates based on these two models are compared for several typical situations. Although Rasch estimates are expected to be more accurate than beta-binomial estimates, differences among them are found not to be substantial in a number of practical situations. Under relatively general conditions and when test retaking is permitted, the probability of making a false negative error is zero. Under the same situation, and given that an examinee is a true nonmaster, the conditional probability of making a false positive error for this examinee is one.

Derivation and Validation of Risk Scores for Cause-Specific Mortality using Verbal Autopsy Data

2021 ◽  
Author(s):  
Tshifhiwa Nkwenika ◽  
Samuel Manda
Keyword(s):  
Verbal Autopsy ◽  
Causes Of Death ◽  
Roc Curves ◽  
Vital Statistics ◽  
Error Rates ◽  
Risk Scores ◽  
False Positive Error ◽  
Specific Mortality ◽  
Developmental Policies ◽  
Burden Of Diseases

Abstract BackgroundDeaths certification remains a challenge mostly in the low-resources countries which results in poor availability and incompleteness of vital statistics. In such sceneries, public health and developmental policies concerning the burden of diseases are limited in their derivation and application. The study aimed at developing and evaluating appropriate cause-specific mortality risk scores using Verbal Autopsy (VA) data. MethodsA logistic regression model was used to identify independent predictors of NCDs, AIDS/TB, and CDs specific causes of death. Risk scores were derived using a point scoring system. Receiver operating characteristic (ROC) curves were used to validate the models by matching the number of reported deaths to the number of deaths predicted by the models. ResultsThe models provided accurate prediction results with sensitivities of 86%, 46%, and 40% and false-positive error rates of 44%, 11%, and 12% for NCDs, AIDS/TB, and CDs respectively. ConclusionThis study has shown that, in low- and medium-income countries, simple risk scores using information collected using verbal autopsy questionnaire could be adequately used to assign causes of death for Non-Communicable Diseases and AIDS/TB

Forensic science evidence: Naive estimates of false positive error rates and reliability

2019 ◽  
Vol 302 ◽  
pp. 109877 ◽  
Author(s):  
Kristy A. Martire ◽  
Kaye N. Ballantyne ◽  
Agnes Bali ◽  
Gary Edmond ◽  
Richard I. Kemp ◽  
...  
Keyword(s):  
Forensic Science ◽  
False Positive ◽  
Error Rates ◽  
Positive Error ◽  
False Positive Error ◽  
Science Evidence

scholarly journals Capacity Analysis for Approach Channels Shared by LNG Carriers

2020 ◽  
Vol 8 (9) ◽  
pp. 697
Author(s):  
Xiang Gao ◽  
Linying Chen ◽  
Pengfei Chen ◽  
Yu Luo ◽  
Junmin Mou
Keyword(s):  
Traffic Management ◽  
Time Windows ◽  
Management Strategies ◽  
Capacity Analysis ◽  
Behavioral Characteristics ◽  
Traffic Capacity ◽  
Approach Channel ◽  
General Cargo ◽  
The Impact

The transport of liquefied natural gas (LNG) has significant impact on traffic capacity of waterways, especially the approach channels shared by LNG carriers and other types of ships (general cargo ships, container ships, etc.). Few studies take the behavioral characteristics of LNG carriers and their impacts into consideration. In this paper, we propose a framework for capacity analysis of shared approach channels based on the spatial–temporal consumption method. It consists of three modules: (1) the tide module predicts the tidal height and tidal time for identifying the time windows for LNG carriers; (2) the spatial–temporal consumption module is introduced to calculate the capacity of approach channels; (3) the LNG carrier navigation module is for analyzing the characteristics of LNG carriers and the impact on the capacity of approach channels. A spatial–temporal indexed chart is designed to visualize the utilization of the spatial–temporal resources. A case study on the approach channel of Yueqing Bay near the east coast of China is conducted to verify the effectiveness of the framework. The utilization rates of the approach channel and the impact of LNG carriers are presented using our method. The results of the case study indicate that the proposed traffic capacity analyzing framework can provide support for making traffic management strategies.

The Clinical Prediction of Dangerousness

1978 ◽  
Vol 24 (1) ◽  
pp. 28-39 ◽  
Author(s):  
Murray L. Cohen ◽  
A. Nicholas Groth ◽  
Richard Siegel
Keyword(s):  
Sexual Offenders ◽  
Predictive Accuracy ◽  
Violent Behavior ◽  
Error Rates ◽  
Statistical Prediction ◽  
False Positive Error ◽  
Critical Studies ◽  
Dangerous Offenders ◽  
Statistical Studies ◽  
Success Of Treatment

Laws committing dangerous sexual offenders indefinitely are legitimate only insofar as "dangerousness" can be predicted and treated. The court has relied on the clinician to identify and measure the crucial variables in violent behavior and assign a probability of occurrence. Yet most critical studies have concluded that not only has predictive accuracy not been demonstrated but also that such accuracy cannot be achieved. We argue that any conclusion at this time is premature. There are data indicating the soundness of clinical as opposed to statistical prediction of dangerous ness. Both approaches show high false positive error rates, but the im provement in accuracy of clinical studies over statistical studies cannot be denied. In examining the success of treatment, the authors present data indi cating that a program of psychological rehabilitation can have a profound effect on the majority of dangerous sexual offenders. The authors conclude that the indefinite commitment of dangerous offenders is legitimate and appropriate, but the policy carries with it heavy responsibilities. Enforcing such an approach means that the clinician must play an important role in his relationship to the court.

Sign in / Sign up

Export Citation Format

Share Document