The Cognitive Radio (CR) technology enables the unlicensed users to share spectrum with licensed on a non-interfering basis. Spectrum sensing is an important function for determine availability of channel in user's spectrum. However, consumes considerable energy which can be reduced by employing predictive methods discovering holes. Using reliable prediction scheme, will sense only those channels are predicted idle. By achieving low probability error predicting idle channels, utilization...

Previous chapter Next Full AccessProceedings Proceedings of the 2012 SIAM International Conference on Data Mining (SDM)Mining Multi-label Streams Using Ensemble-based Active LearningPeng Wang, Peng Zhang, and Li GuoPeng Guopp.1131 - 1140Chapter DOI:https://doi.org/10.1137/1.9781611972825.97PDFBibTexSections ToolsAdd to favoritesExport CitationTrack CitationsEmail SectionsAboutAbstract stream classification has drawn increasing attention from data mining community in recent years, where a...

In this paper, quality of service (QoS) provisioning for voice over cognitive radio networks is considered. As traffic sensitive to delay, the presence primary users and requirement that secondary should not interfere with them pose many challenges QoS support users. Two medium access schemes are proposed in paper available channel. An analytical model developed obtain capacity (i.e., maximum number can be supported guarantee) users, taking impact users' activities into consideration. The...

<p indent=0mm>Sustainable Development Goals (SDGs) proposed by the United Nations Sustainable Summit in 2015 are a roadmap for action to promote coordinated development of economy, society, and environment. Natural resources, including energy, water, biomass, minerals, land, key elements achievement SDGs. Various dependence, substitution, competition, complementation relationships exist among different kinds natural resources. The idea intrinsic interconnectivities world's material basis,...

The distributed resource controller (DRC) technology described in this paper provides a novel approach to interfacing applications with emerging network mechanisms deliver quality of service (QoS) and controlling utilization. DRC aims unify services (e.g., Diffserv, Intserv, ATM) application QoS provisioning by introducing middleware system set generic interfaces. is the core part that translates requests for delivery into respective access underlying systems manner optimizes utilization...

Matrix converters with three-level phase switching and five-level line characteristics have recently been proposed as improved ldquoall semiconductorrdquo ac-ac power processors. For their control, different modulation schemes also developed researchers claiming performance merits. To avoid confusion hence fasten the converter applications in industry, it would surely be better for to from a common set of principles that unfortunately has not yet thoroughly defined. Contributing area...

Accurate first arrival picking plays a crucial role in microseismic data processing. However, it is challenging to guarantee satisfactory accuracy with conventional approaches when the signal-to-noise ratio (SNR) of low. This article proposes an automatic time method based on fuzzy <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$C$ </tex-math></inline-formula> means clustering (FCM) and Akaike information...

Although the modulation of ac-ac matrix converters using space vector theory has long been established, their carrier-based principles have only recently attracted some attention. Reasons commonly stated for evaluating alternative include simpler converter control because its inherent auto-sequencing process, and easier implementation fast on-chip timers embedded in most modern digital signal processors. Motivated by these likely merits, which previously proven dc-ac inverters, an...

This paper presents a novel hybrid modulation method based isolated high frequency (HF) bidirectional inverter for AC microgrid application. Bidirectional current-fed converter has been employed to interface the energy storage and intermediate fluctuating dc bus. A new techniques consisting of fluctuating-dc-modulation (FDM) at low (LF) scale secondary (SM) HF proposed converter. The zero current soft switching (ZCS) primary side devices voltage (ZVS) front-end full-bridge is realized....

The aquatic products of grazing ecological culture exhibit a strong reliance on the production environment system, which may result in heavy metal contamination. In this study, 24 elements (Ag, Al, As, Ba, Cd, Co, Cr, Cs, Cu, Fe, Ga, K, Mg, Mn, Na, Ni, Pb, Rb, Se, Sr, Tl, U, V, Zn) were determined for Oviductus Ranae (OR) from more than 1,000 individuals Rana dybowskii produced by pond culture–forest relay mode six major areas Heilongjiang Province, China. Furthermore, we assessed associated...

The Cardinality Balanced MeMBer (CBMeMBer) filter is a single sensor multi-target tracking method based on the random finite set. Compared with system, multi-sensor system can achieve more stable and better performance in targets. However, some problems exist CBMeMBer filter. Tracks are described by parameter sets which may be generated miss-detection, targets clutters. It difficult to associate correctly because of their complex forms various types. Moreover, reacts slowly disappeared...

Surveys found that in the post-epidemic era, academic atmosphere higher vocational colleges has not only continued previous problems, but also addition, evolution and superposition of problems caused by COVID-19 epidemic, mainly manifested weak motivation, poor discipline, professionalism. In this regard, should take comprehensive measures to strengthen students’ identity as “the first persons responsible for learning”, give full play convenience brought informationization personalized...

Addressing the issues of scarce corpora, semantic sparsity, and polysemy in field tender announcements, this paper proposes a bid announcement domain named entity recognition model based on two-stage enhancement. The consists two core stages: context-aware fine-tuning (CFT) multi-dimensional context synthesis (MDCS). In CFT stage, domain-specific dataset is constructed, ERNIE fine-tuned using multi-stage masking strategy to acquire context-specific information domain. Subsequently, MDCS...

Spatial data analysis and mining is more difficult to put into practice than classical due complexity of geographical phenomena. This paper preliminary analyzed main problem faced by SDM, provided a basic framework for SDM with spatial statistical methods. Logistic regression popular in LUCC building relationships between land use types influential factors sampling which actually cannot handle autocorrelation completely. Took forest extracted from TM image Yubei county area as binary...