In machine learning, we often face the situation where event are interested in has very few data points buried a massive amount of data. This is typical network monitoring, streamed from sensing or measuring units continuously but most not for events. With imbalanced datasets, classifiers tend to be biased favor main class. Rare detection received much attention and yet it still challenging problem. this paper, propose remedy standing Weighting sampling two fundamental approaches address We...

We propose and experimentally demonstrate a slit beam shaping method for femtosecond laser Point-by-Point (PbP) inscription of highly localized Fiber Bragg Gratings (FBGs). The influence width on the shape area Refractive Index Modulation Region (RIMR) induced by single pulse was investigated. RIMR can be changed from spot to line with an enlarged RIMR, hence enhances coupling strength core mode cladding modes. RIMRs were precisely assembled along fiber core, producing FBGs spectral comb...

We demonstrate the fabrication of a new highly birefringent cladding fiber Bragg grating (Hi-Bi CFBG) consisting pair sawtooth stressors near core by using femtosecond laser direct writing technology. The unique structure serves as in-fiber stressor and also generates resonance due to its periodicity. After optimization pulse energy, Hi-Bi CFBG with high birefringence 2.2 × 10-4 low peak reflectivity ∼ -24.5 dB (corresponding 0.3%) was successfully fabricated in conventional single-mode...

Analysis of gait dynamics in children may help understand the development neuromuscular control and maturation locomotor function. This paper applied nonparametric Parzen-window estimation method to establish probability density function (PDF) models for stride interval time series 50 (25 boys 25 girls). Four statistical parameters, terms averaged (ASI), variation (VSI), PDF skewness (SK), kurtosis (KU), were computed with PDFs study children. By analyzing results three age groups (aged 3–5...

Analysis of gait patterns in children is useful for the study maturation locomotor control. In this paper, we utilized Parzen-window method to estimate probability density functions (PDFs) stride interval 50 children. With estimated PDFs, statistical measures, i.e., averaged (ASI), variation (VSI), PDF skewness (SK), and kurtosis (KU), were computed three age groups (aged 3-5 years, 6-8 10-14 years) young The results indicated that ASI VSI values are significantly different between groups....

Blockchain technology has gained growing popularity in recent years. While the works well for most applications, vulnerability of blockchain-based system is not understood. The core part a consensus algorithm. It can be regarded as protocol used by all network users to make decisions on growth chain. Malicious exploit vulnerabilities algorithm launch block withholding attacks earn more profit increasing their winning possibilities, which are significant threats security applications. In this...

Gait is a particular locomotion pattern of human body. Analysis gait parameters may help identify posture-related problems in people with injuries or diseases. In this work, biokinetic gyroscopes wireless data transmission capability were used to record the right ankle angular rates during walking. A match filter and turns detection algorithm measure cadence its subphases. Results experiments on group 16 healthy subjects demonstrated that proposed method can detect temporal high degree...

Semantic Web approaches are often used for service description, modeling, semantics discovery, capabilities matching, etc. However, as the primary querying tool Web, SPARQL is yet to be deeply explored support composition. Therefore modeling and composition of services usually two-tier. This paper extends path query, so that in our framework which finds top-k shortest data flows satisfy user constraints. Experiment results on real-world datasets exhibit its applicable performance compared...

Out-of-stock is considered to be a major problem for retailers and suppliers. In this paper, we study the of complex event processing in RFID enabled retail store operation, particularly aiming provide automated shelf replenishment decisions. We define different queries simulate retailer workflow area backroom (warehouse) sales floor over data streams with item level case-level tagging. With these detect levels objects movement, can quickly replenish shelves without long time delays. utilize...

The application of construction waste in road engineering is an effective means to improve the level resource recycling. Due lack specialized sorting equipment for different types and high cost manual sorting, utilization enterprises mainly rely on mixed crushing regeneration production, while there a systematic research technical indicators recycled aggregates brick concrete waste. This article proposes quality evaluation model coarse based theory matter element extension, providing new...

National parks act as significant carbon reserves and sinks, yet their ability to offset emissions is under threat, underscoring the need for stringent greenhouse gas emission control reduction measures. Previous research has lacked detailed spatial inventories of from all national park sources at a level, impeding development precise management strategies. In this study, we conducted uniform analysis across five in China year 2020 scale. It quantitatively assesses distribution...

Ultra-high-temperature monitoring is of great significance in many extreme environments, such as aerospace and power industries. Since the melting temperature single-crystal sapphire fibers up to 2045 ℃, fiber Bragg gratings (SFBGs) can serve an ideal ultra-high-temperature sensors. However, SFBGs suffer from lossy spots due high oxidation, resulting a significant deterioration spectral signal-to-noise ratio (SNR) decrease demodulation accuracy. Here, sensor based on SFBG, which was...

In this paper, we consider the power line outage identification problem as a graph signal classification problem, where at each vertex is given time series. We propose convolutional networks (GCNs) for task of classifying signals supported on graphs. An important element GCN design filter design. filtering in either (spatial) domain, or frequency (spectral) domain. Two basic architectures are proposed. spatial architecture, uses shift operator building block to incorporate underlying...

Based on objective data and visual knowledge graphs, this paper summarizes the main research content, theme evolution, trajectory development trend of international university information literacy education. It draws highquality novel teaching concepts, methods contents, proposes constructive suggestions for plan quality education in China, provides references curriculum construction “Document Retrieval”, as well future subsequent

A compact dual-band bandpass filter (BPF) with controllable center frequencies (CFs) and bandwidths based on only one single substrate integrated waveguide (SIW) cavity has been presented. The proposed structure consists mainly of a pair T-shaped slots which are etched the top metal layer SIW cavity. modes generated by perturbed TE101 TE102 in used to achieve dual-frequency response. By changing width spacing two slots, desired CFs passbands can be tuned independently. prototype BPF...

Based on 45nm process, a 14 bit 20 MS/s pipelined analog-to-digital converter (ADC) was designed. In this paper, the ring amplifier is used to replace traditional operational (OTA). The has advantage s of large bandwidth and good linearity, minimum power supply voltage low, so core analog module digital ADC 1.2V, which reduces overall consumption ADC. consisted 7 stages, in 2.5-bit/stage applied from 1st 6th stage last 2-bit Flash tested with sampling frequency 250MS/s. simulation results...