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Found 6278 publications

Analysis of temporal patterns of physiological parameters

B. Benyo

Publication Name: Neural Networks in Healthcare Potential and Challenges

Publication Date: 2006-12-01

Volume: Unknown

Issue: Unknown

Page Range: 284-316

Description:

This chapter deals with the analysis of spontaneous changes occurring in two physiological parameters: the cerebral blood flow and respiration. Oscillation of the cerebral blood flow is a common feature in several physiological or pathophysiological states and may significantly influence the metabolic state of the brain. Our goal was to characterize the temporal blood flow pattern before, during, and after the development of CBF oscillations. Investigation of this phenomenon may not only clarify the underlying regulatory mechanisms and their alterations under certain conditions but also lead to the development of novel clinical diagnostic tools for early identification of developing cerebrovascular dysfunction in pathophysiological states such as brain trauma or stroke. A disturbance in normal breathing may occur in several nervous and physical diseases. In the present study, we introduce a reliable online method which is able to recognize abnormal sections of respiration, that is, the most common breathing disorder, the sleep apnea syndrome, based on a single time signal, the nasal air flow. There are several common features of the above problems and signals under investigation that imply similar solutions. The chapter introduces the systematic way of selecting proper feature extraction method and optimal classification procedure. The introduced approach can be generalized for the analysis of similar time series featuring physiological parameters. © 2006, Idea Group Inc.

Open Access: Yes

DOI: 10.4018/978-1-59140-848-2.ch013

On the differences of the discrete weak and strong maximum principles for elliptic operators

Miklós E. Mincsovics Tamás L. Horváth

Publication Name: Lecture Notes in Computer Science Including Subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics

Publication Date: 2012-06-06

Volume: 7116 LNCS

Issue: Unknown

Page Range: 614-621

Description:

When choosing a numerical method to approximate the solution of a continuous mathematical problem, we need to consider which method results in an approximation that is not only close to the solution of the original problem, but possesses the important qualitative properties of the original problem, too. For linear elliptic problems the main qualitative properties are the various maximum principles. The preservation of the weak maximum principle was extensively investigated in the last decades, but not the strong maximum principle preservation. In this paper we focus on the latter property by giving its necessary and sufficient conditions, investigating the relation of the preservation of the strong and weak maximum principles and illustrating the differences between them with numerous examples. © 2012 Springer-Verlag.

Open Access: Yes

DOI: 10.1007/978-3-642-29843-1_70

Identification of the 2D vector Preisach hysteresis model

Miklós Kuczmann

Publication Name: COMPEL the International Journal for Computation and Mathematics in Electrical and Electronic Engineering

Publication Date: 2011-03-14

Volume: 30

Issue: 2

Page Range: 538-551

Description:

Purpose-The purpose of this paper is to present a Preisach model to simulate the vector hysteresis properties of ferromagnetic materials. Design/methodology/approach-The vector behavior has been studied at low frequency applying a single-sheet tester with a round-shaped specimen, and the locus of the magnetic flux density vector has been controlled by a digital measurement system. An inverse vector Preisach hysteresis model has been developed and identified by using the measured data. Findings-Finally, the inverse model has been inserted into a finite element procedure through the combination of the fixed point technique and the reduced magnetic scalar potential formulation. The developed single-sheet tester measurement system has been simulated. The applicability of the realized measurement system as well as the developed model has been proven by comparing measured and simulated results. Originality/value-The identification technique is original, based on a previous work of the author. © Emerald Group Publishing Limited.

Open Access: Yes

DOI: 10.1108/03321641111101069

From vérszerződés 'blood oath' to vérciki 'bloody awkward': Cultural conceptualization of VÉR 'blood' in Hungarian

Judit Baranyiné Kóczy

Publication Name: Magyar Nyelvor

Publication Date: 2020-01-01

Volume: 144

Issue: 1

Page Range: 103-122

Description:

Historical, ethnographic, and theological studies witness the diversified symbolism and decisive cultural role of 'blood'. The paper explores the role of the body fluid concerned in conceptualization, from the point of view of cognitive-cultural linguistics. The aim is to unfold the metaphorical and metonymic domains of Hungarian vér 'blood' and the culture-specific factors of world view (beliefs and events) that determine the role of that body fluid in the cultural cognition of the Hungarian community, on the basis of relevant expressions found in standard handbooks and data of the Hungarian National corpus. such factors include death, kinship, human nature, vitality, emotion, intensity, and malediction. The paper depicts conceptualizations of 'blood' and its profiled features in the individual domains in a network.

Open Access: Yes

DOI: 10.38143/NYR.2020.1.103

Calcium oscillations in fertilized pig oocytes are associated with repetitive interactions between STIM1 and ORAI1

Chi Hong Chao Lu Zhang Zoltan Machaty Ágnes Bali Papp Laurie A. Jaeger

Publication Name: Biology of Reproduction

Publication Date: 2018-04-01

Volume: 98

Issue: 4

Page Range: 510-519

Description:

The Ca 2+ entry mechanism that sustains the Ca 2+ oscillations in fertilized pig oocytes was investigated. Stromal interaction molecule 1 (STIM1) and ORAI1 proteins tagged with various fluorophores were expressed in the oocytes. In some cells, the Ca 2+ stores were depleted using cyclopiazonic acid (CPA); others were inseminated. Changes in the oocytes' cytosolic free Ca 2+ concentration were monitored, while interaction between the expressed fusion proteins was investigated using fluorescence resonance energy transfer (FRET). Store depletion led to an increase of the FRET signal in oocytes co-expressing mVenus-STIM1 and mTurquoise2-ORAI1, indicating that Ca 2+ release was followed by an interaction between these proteins. A similar FRET increase in response to CPA was also detected in oocytes co-expressing mVenus-STIM1 and mTurquoise2-STIM1, which is consistent with STIM1 forming punctae after store depletion. ML-9, an inhibitor that can interfere with STIM1 puncta formation, blocked store-operated Ca 2+ entry (SOCE) induced by Ca 2+ add-back after a CPA treatment; it also disrupted the Ca 2+ oscillations in fertilized oocytes. In addition, oocytes overexpressing mVenus-STIM1 showed high-frequency Ca 2+ oscillations when fertilized, arguing for an active role of the protein. High-frequency Ca 2+ oscillations were also detected in fertilized oocytes co-expressing mVenus-STIM1 and mTurquoise2-ORAI1, and both of these high-frequency Ca 2+ oscillations could be stopped by inhibitors of SOCE. Importantly, in oocytes co-expressing mVenus-STIM1 and mTurquoise2-ORAI1, we were also able to detect cyclic increases of the FRET signal indicating repetitive interactions between STIM1 and ORAI1. The results confirm the notion that in pig oocytes, SOCE is involved in the maintenance of the repetitive Ca 2+ transients at fertilization.

Open Access: Yes

DOI: 10.1093/biolre/ioy016

Robust blood-glucose control using Mathematica

B. Benyo László Török Levente Kovács Z. Benyó Béla Paláncz

Publication Name: Annual International Conference of the IEEE Engineering in Medicine and Biology Proceedings

Publication Date: 2006-12-01

Volume: Unknown

Issue: Unknown

Page Range: 451-454

Description:

A robust control design on frequency domain using Mathematica is presented for regularization of glucose level in Type I diabetes persons under intensive care. The method originally proposed under Mathematica by Helton and Merino, [1] - now with an improved disturbance rejection constraint inequality - is employed, using the three-state minimal patient model of [2]. The robustness of the resulted high-order linear controller is demonstrated by nonlinear closed loop simulation in state-space, in case of standard meal disturbances and is compared with H∞ design implemented with the mu-toolbox of Matlab. The controller designed with model parameters represented the most favorable plant dynamics from the point of view of control purposes, can operate properly even in case of parameter values of the worst-case scenario. ©2006 IEEE.

Open Access: Yes

DOI: 10.1109/IEMBS.2006.259916

Void Geometry Identification with Track-Side Rail Deflection Measurements

Szabolcs Fischer Mykola Sysyn Olga Nabochenko

Publication Name: Lecture Notes in Networks and Systems

Publication Date: 2025-01-01

Volume: 1258 LNNS

Issue: Unknown

Page Range: 188-202

Description:

One of the most common failure types that rapidly deteriorates track geometry is sleeper voids or unsupported sleepers. Ballast pulverization, or so-called “white spots”, is a sign that indicates the presence of the high sleeper voids in the track. However, the objective estimation of the size and form of voids is possible by time- and cost-consuming track-side measurements at many points along the track. The study presents an efficient model-based approach for the identification of the void geometry by the track-side experimental measurements of rail deflection in one point. A robust 3-beam track model with a two-mass vehicle model together with a time-effective surrogate optimization algorithm is used for the multidimensional search of the void geometry that is fitting to experimental data. The results show that the void geometry could be found precisely with one-point measurements, significantly reducing the time and cost involved in the process. Therefore, a practical, simplified method of determining the void zone's depth and length is proposed. It is based on analyzing the relation between void sizes and the rail deflection wave sizes. Unlike the void depth, the void length cannot be found by the simple difference between the deflection waves in the void and the reference zones. The proposed method assumes wave estimation by applying deflection thresholds, ensuring a practical and reliable approach. The reliability of the proposed method in estimating void length and depth instills confidence in the effectiveness of the approach. Finally, it was used to estimate the void length and depth for many problem zones in ballast tracks that were inspected with track-side measurements. The result analysis shows that the void length and depth are subjected to a non-linear relation: the long-length voids have unproportionally higher depths than short voids. The results indicate that the settlement intensity of the neighbor-to-void sleepers is much lower than that of the hanging sleepers.

Open Access: Yes

DOI: 10.1007/978-3-031-81799-1_18

“What is going on in global goals projects, is agenda filled?” Highlighting circular economy literature within sustainable development goals–review-based

Lóránt Dávid Al Fauzi Rahmat Zoltán Bujdosó

Publication Name: Discover Sustainability

Publication Date: 2024-12-01

Volume: 5

Issue: 1

Page Range: Unknown

Description:

The global goal of development concerns has embraced global action, leading to framework initiatives grounded in future-proof projects. Closely aligned with circular economy (CE) initiatives, which minimize single-use materials and address practices that reflect sustainability concepts, studies are rapidly emerging to identify practices in CE literatures relevant to SDGs. Therefore, a study to identify the CE literatures' contribution towards domains and targets in SDGs is highly urgent. By drawing a total of 4431 as a sampling of final literature analyzed using instrument tools in metrics mapping. Our discovery shows that CE studies contribute to posts in SDGS target achievement, which keeps on increasing. To dive deep into CE research on CE’s relevance to SDGs, it was observed that China’s scholars offered their publications in various viewpoints. Significantly, SDG12 (n = 68.9%) and have exceeded half a percentage of publications covering CE relevance to SDGs, implied that CE studies focused heavily on sustainable consumption and production patterns through actions in reaching SDGs. Followed by SDG7 (n = 6.3%), strongly reinforcing CE provides assessed value in SDGs calling for affordable and sustainable development and energy for all, in line with relied CE actions in considering innovation models to recreate product and energy resource reuse practices in a bid to minimize the adverse impacts for future. Given additional insights on circular economy targets related to SDGs, the research implication was to provide a policy recommendation to encourage the practice of circular economy based on SDGs targets.

Open Access: Yes

DOI: 10.1007/s43621-024-00621-8

The effect of soil physicochemical characteristics on zinc analysis methods

Csaba Centeri Renato Kalocsai G. Milics Zsolt Biró Viktoria Vona A. J. Kovács Endre Andor Tóth István Mihály Kulmány Gergely Jakab Zsolt Giczi

Publication Name: Soil and Water Research

Publication Date: 2021-01-01

Volume: 16

Issue: 3

Page Range: 180-190

Description:

Zn is an essential micronutrient involved in a wide variety of physiological processes. Soils are tested for zinc in many countries with several extractants. Each country has its validated methods, best-suited for its soils. The current study was designed to compare different zinc content measuring methods with seventy-one samples from Hungary. The data were first compared for the whole dataset and then in certain categories such as CaCO3-content, pH, texture and clay content. The zinc content was determined by the water extraction, KCl-EDTA (ethylenediaminetetraacetic acid), Mehlich 3, CoHex (cobalt hexamine trichloride), and XRF (X-ray fluorescence) methods. Based on the analyses of all the data, we can conclude that all the methods are different. However, further analyses during the comparison of the methods based on the influencing factors, such as the pH, lime content, texture class, and clay content proved that, in some of the cases, there are similarities among the methods and, this way, we can get more knowledge on the measurements and the results provided. Farmers can gain extra knowledge from the comparison of the influencing factors to know where intervention is needed to use extra Zn for the proper fertilisation of their plants.

Open Access: Yes

DOI: 10.17221/53/2020-SWR