Abstract Security devices produce huge number of logs which are far beyond the processing speed human beings. This paper introduces an unsupervised approach to detecting anomalous behavior in large scale security logs. We propose a novel feature extracting mechanism and could precisely characterize features malicious behaviors. design LSTM-based anomaly detection successfully identify attacks on two widely-used datasets. Our outperforms three popular algorithms, one-class SVM, GMM Principal...

In this paper, in order to rapidly measure the temperature of a high-temperature target real time without emissivity data, high-precision multispectral radiation measurement method based on improved grey wolf optimization (IGWO) algorithm is proposed. The can automatically identify models different trends and realize simultaneous estimation hypothesis model. IGWO applied test silicon carbide tungsten material. results show that absolute relative errors (the tungsten) are less than 3 K (4.5...

Free-space laser communication systems usually experience strong channel fading caused by atmospheric turbulence. Two optical schemes utilizing adaptive opticals at the transmitter are proposed. Numerical simulations show that proposed can significantly reduce fading.

The average power loss and the channel fading are among major challenges of free-space optical (FSO) communications through turbulent atmosphere, which result in severe bit-error-rate (BER) performance degradation, or even communication link outage. For same received signal power, degradation BER is strongly dependent on statistics. This paper studies coding using Reed-Solomon (RS) codes for improving FSO system distance. Large-scale numerical simulations have been conducted to obtain...

Partial splenic artery embolization (PSE) is an effective treatment modality for patients with hypersplenism. It less invasive and has a quicker recovery compared surgical procedures. PSE usually performed using femoral approach that requires bedrest few hours, which rarely the case transradial PSE.To compare transfemoral approaches of spleen in hypersplenism.In all, 84 hypersplenism who required were recruited. They randomly divided into two groups on basis procedure followed: (R-PSE, n =...

Free-space optical (FSO) communication systems suffer from both average signal power loss and random fading due to the atmospheric turbulence. For focused laser beams propagating along horizontal path, received statistics of as functions distance receiver aperture size are studied via large scale numerical simulations. The avalanche photodiode (APD) is chosen for detection, accurate McIntyre-Conradi APD model adopted system evaluation. on-off keying (OOK) method used beam modulation. FSO...

Automatic discrimination of music mood is one important field MIR. Considering the difference Chinese traditional and Western classical music, it necessary to study these two kinds music's taxonomy. In this paper, taxonomy models are implemented, then three content feature sets extracted directly from waveform audio clips. Finally, clips classified by their combination using Bayesian network classifier. The experiment results indicate that detection rate lower than no matter single set or...

Effects of beam wander on uncoded bit-error-rate (BER) direct-detection OOK modulated FSO communication systems using collimated and focused Gaussian beams are studied. Channel fading statistics obtained from large-scale wave optics simulations compared with the closed-form log-normal gamma-gamma models. The avalanche photodiode (APD) is chosen for photodetection. accurate McIntyre-Conradi APD model adopted performance evaluation. Results show that large gain (more than 15dB) can be achieved...

A free-space optical (FSO) communication system that does not implement compensation strategies for the effects of beam wander may experience deep long-term channel fades or even severe outage when laser spot wanders away from receiver aperture due to atmospheric turbulence. The impacts diverging angles on fading probability density function (pdf) and bit-error-rate (BER) performance both uncoded coded FSO systems are studied different sizes propagation distances. optimal determined...

Previous studies have suggested that the cerebral microglia activation was associated with Aβ plaques, whereas quetiapine, an atypical antipsychotic drug, decreased levels in Alzheimer's disease (AD) mice. The aim of present study to evaluate effects quetiapine on microglial amyloid precursor protein/presenilin-1 double transgenic mouse model AD. Nontransgenic and mice were treated (0 or 5 mg/kg/day) drinking water from age 2 months. After 10 months continuous administration, killed,...

Hydroxyapatite (HA) has been widely used in clinical field because of its excellent biocompatibility. However, poor thermal stability limits application. In present paper, the decomposition characteristics both nano-sized HA powder prepared by precipitation method and sinters at temperature from room to 1500°C air were studied. X-ray diffractometer (XRD), High-temperature Raman spectroscopy, differential scanning calorimeter (DSC) Cell culture work investigate their characteristics. The...

Aims: This study aimed to establish an auxiliary diagnosis model for solitary pulmonary nodules (SPNs) and evaluate its test efficacy. Methods: Three hundred thirty-two pathologically diagnosed SPN patients (186 malignant, 146 benign) were collected as subjects. The serum levels of 8 types markers 9 computed tomography (CT) imaging features each patient treated independent variables. corresponding pathological classification results (fungal inflammation, tuberculosis tuberculoma,...

The turbulent atmosphere causes wavefront distortion, beam wander, and broadening of a laser beam. These effects result in average power loss instantaneous fading at the receiver aperture thus degrade performance free-space optical (FSO) communication system. In addition to atmospheric turbulence, FSO system may also suffer from pointing error. error excessive fading. This paper proposes studies an analytical method for calculating channel probability density function (pdf) induced by both...

Recent advancement in sensor networks provides a platform for applications that requires in-network data fusion and parallel algorithms. However, processing while propagating at low latency is very challenging. Also, implementation of these algorithms limited by various constraints including energy, computation costs complex network topology. In this paper, statistical graphical model based algorithm developed processing, which can be applied to tracking problems the networks. This...

Making use of spare radio resource to complete communication for secondary user under the constraint that not interrupting primary is an important issue in cognitive communication. A coexistence window proposed this paper inside which and share channel time division manner. The access performance with length varying analyzed, while maintain priority user. Two concepts, connectivity probability link utility efficiency, are defined measure They evaluated varying, results show there tradeoff...

To distinguish the contributions of electromagnetically induced transparency (EIT) and Autler-Townes splitting (ATS) in their applications precision laser spectroscopy, we propose a real-imaginary spectrum decomposition method to investigate spectra four-level microwave (MW) dressed Rydberg system. We show that opening windows absorption probe field is prominent character by EIT, EIT-ATS crossover, ATS when MW turned off intensity control adjusted. When on gradually increased, EIT destroyed...

Modern manufacturing industry has a strong measurement demand of specular surfaces. Fringe reflection method the advantages simple structure, low cost, high accuracy, and is becoming more popular for 3D these Most previous methods achieve fringe using single camera, suffer problem gradient-height ambiguity. Here, binocular reflectometry proposed with surface normal obtained through vector consistency measured surface. To enhance computation efficiency, polar constraint bisection are also...

The concept of Matrix Optics is explained in detail and some key matrices which are used given, including ABCD Jones matrices. Some examples to model optical components provided. basic principles Optical Communication Systems explicated, along with their principal components. performance metrics mentioned, each a brief explanation: Bandwidth, signal-to-noise ratio, bit error rate. applications investigated, as well advanced techniques technologies. In this regard, bends causing signal...

Csiszár's I-divergence is adopted as a discrepancy measure for the nonnegative impulse response intersymbol interference (ISI) channel demodulation. Both blind and nonblind demodulation algorithms are discussed numerically studied. Simulation results show that they have bit error rate (BER) performance close to Viterbi algorithm one-dimensional channel. Furthermore, asymptotic optimality of studied theoretically. It shown agrees with Euclidean distance asymptotically. The role progressive...

Euclidean distance is a discrepancy measure between two real-valued functions. Divergence positive Corresponding to these well-known measures, there are inference principles; namely, the least-squares principle for choosing function subject linear constraints, and minimum-divergence constraints. To make connection principles more transparent, this correspondence provides an observation constructive proof that reduces asymptotically as positivity requirements de-emphasized. Hence, consistent.