Article
Computer Science, Information Systems
Xinmin Tao, Wenjie Guo, Chao Ren, Qing Li, Qing He, Rui Liu, Junrong Zou
Summary: The study introduces a novel density peak clustering algorithm using a globally and locally consistent adjustable manifold distance, to effectively capture clusters with different densities and sizes. Experimental results demonstrate that this method outperforms other clustering techniques with statistical significance.
INFORMATION SCIENCES
(2021)
Article
Mathematics, Applied
Fatemah Mofarreh, S. K. Srivastava, Anuj Kumar, Akram Ali
Summary: The main purpose of this paper is to study the properties of PR-semi-invariant submanifold in para-Kenmotsu manifold. The integrability conditions for the invariant distribution and anti-invariant distribution are obtained. Some existence and non-existence results of PR-semiinvariant warped product submanifolds are obtained. Necessary and sufficient conditions for PR-semi-invariant submanifold to be a PR-semi-invariant warped product submanifold in para-Kenmotsu manifold are provided. In addition, sharp inequalities for PR-semi-invariant warped product submanifold in para-Kenmotsu manifolds are derived.
Article
Computer Science, Artificial Intelligence
Rakesh Kumar Yadav, Abhishek, Shekhar Verma, S. Venkatesan
Summary: This paper proposes a cross-covariance based graph affinity (CCGA) method to better represent the relation between data points. Experimental results show that CCGA can more accurately measure the affinity between data points, leading to improved low-dimensional representation and classification accuracy.
APPLIED INTELLIGENCE
(2021)
Article
Mathematics, Applied
Selcen Yuksel Perktas, Adara M. M. Blaga
Summary: In this article, the authors investigate sequential warped product submanifolds of Sasakian manifolds, focusing on the case where the sequential warped product contains one invariant, one pointwise slant, and one anti-invariant submanifold. They provide nonexistence results for this particular scenario and deduce properties and establish Chen's inequality in the two possible cases.
MEDITERRANEAN JOURNAL OF MATHEMATICS
(2023)
Article
Mathematics
Leon Simon
Summary: With respect to a C infinity metric close to the standard Euclidean metric, a class of embedded (N + )-dimensional pound hypersurfaces without boundary is constructed, which are minimal and strictly stable, and have a singular set equal to an arbitrary preassigned closed subset K C {0} x Re. This settles the question of whether there can be gaps or fractional dimensional parts in the singular set with a strong affirmative. The construction involves the analysis of solutions u of the symmetric minimal surface equation on domains 52 C Rn whose symmetric graphs lie on one side of a cylindrical minimal cone.
ANNALS OF MATHEMATICS
(2023)
Article
Mathematics
Hulya Aytimur, Adela Mihai, Cihan ozgur
Summary: The paper establishes the Chen first inequality and a Chen inequality for the delta(2, 2)-invariant on statistical submanifolds of Sasaki-like statistical manifolds under a certain curvature condition.
Article
Mathematics
Ion Mihai, Radu-Ioan Mihai
Summary: The paper provides a simple proof of the Chen inequality concerning the Chen invariant delta(k) of submanifolds in Riemannian space forms, deriving Chen's first inequality and the Chen-Ricci inequality. Furthermore, a corresponding inequality for statistical submanifolds is established.
Article
Mathematics
Cornelia Livia Bejan, Cem Sayar
Summary: Ronsse introduced the notions of generic and skew CR-submanifolds of almost Hermitian manifolds to unify and generalize various submanifold concepts. Tripathi extended this notion to contact geometry, while authors here introduce and study generic submanifolds with the Reeb vector field not necessarily tangent to the submanifold. They obtain conditions for integrability and parallelism of eigen-distributions and investigate properties of the Reeb vector field and its curves. They also establish geodesic results and give conditions for a generic submanifold to be written locally as a product of eigen-distribution leaves.
BULLETIN OF THE MALAYSIAN MATHEMATICAL SCIENCES SOCIETY
(2022)
Article
Engineering, Biomedical
Dezhen Xiong, Daohui Zhang, Xingang Zhao, Yaqi Chu, Yiwen Zhao
Summary: This paper presents a novel approach using SPD manifold to extract spatial structural information from limited EMG signals for myoelectric pattern recognition. Experimental results demonstrate the superior performance of the proposed method compared to traditional feature extraction methods, and its effectiveness is further validated on different databases.
IEEE TRANSACTIONS ON NEURAL SYSTEMS AND REHABILITATION ENGINEERING
(2022)
Article
Mathematics, Applied
Tugba Mert, Mehmet Atceken
Summary: This article investigates pseudoparallel submanifolds for Lorentzian para-Kenmotsu manifolds, focusing on the W1-curvature tensor. The characteristics of submanifolds with properties such as W1-pseudoparallel, W1 -2 pseudoparallel, W1-Ricci generalized pseudoparallel, and W1 - 2 Ricci generalized pseudoparallel have been studied.
Article
Mathematics, Applied
Nergiz (Onen) Poyraz
Summary: This article introduces screen generic lightlike submanifolds of indefinite cosymplectic manifolds, investigates the integrability of various distributions, and proves a characterization theorem of such lightlike submanifolds in a cosymplectic space form. We study contact totally umbilical screen generic lightlike submanifolds and minimal screen generic lightlike submanifolds. Examples are also provided.
Article
Chemistry, Physical
Zhengyu Liu, Keqing Wang, Huijuan He, Juan Xie, Wei Huang
Summary: In this study, the issue of detecting pseudo welding defects in laser welding of battery modules is addressed. By establishing one-dimensional heat transfer and electro-thermal coupling models and analyzing battery voltage using voltage Euclidean distance, quick and accurate detection of welding quality is achieved.
JOURNAL OF POWER SOURCES
(2022)
Article
Multidisciplinary Sciences
Sachin Kumar Srivastava, Fatemah Mofarreh, Anuj Kumar, Akram Ali
Summary: In this article, we investigate the properties of PR-pseudo-slant submanifolds in para-Kenmotsu manifolds and derive the integrability conditions for their slant distribution and anti-invariant distribution. We obtain the necessary and sufficient conditions for a PR-pseudo-slant submanifold to be a PR-pseudo-slant warped product, in terms of warping functions and shape operator. The article also provides examples of PR-pseudo-slant warped products in para-Kenmotsu manifolds.
Article
Mathematics, Applied
Richard J. Smith, Filip Talimdjioski
Summary: This article discusses the metric approximation property of the pointed metric space (M, d), where M is a closed C1-submanifold of RN and d is the metric given by d(x, y) = ilx - yil, x, y E M.
JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS
(2023)
Article
Mathematics
Fulya Sahin, Bayram Sahin, Feyza Esra Erdogan
Summary: This paper discusses the Norden golden manifold with a constant sectional curvature. It explores the concepts of holomorphic-like sectional curvature and holomorphic-like bisectional curvature, but finds them inadequate for the Norden golden manifold. Therefore, it proposes a new concept of sectional curvature, called the Norden golden sectional curvature, and provides an example. It also examines the semi-invariant submanifolds of the Norden golden space form, which have nice properties due to the constant sectional curvature.
Article
Engineering, Biomedical
Maximilian E. H. Wagner, Nils-Claudius Gellrich, Karl-Ingo Friese, Matthias Becker, Franz-Erich Wolter, Juergen T. Lichtenstein, Marcus Stoetzer, Majeed Rana, Harald Essig
INTERNATIONAL JOURNAL OF COMPUTER ASSISTED RADIOLOGY AND SURGERY
(2016)
Article
Biophysics
Ricardo Manuel Millan Vaquero, Alexander Vais, Sean Dean Lynch, Jan Rzepecki, Karl-Ingo Friese, Christof Hurschler, Franz-Erich Wolter
JOURNAL OF BIOMECHANICAL ENGINEERING-TRANSACTIONS OF THE ASME
(2016)
Article
Computer Science, Software Engineering
Benjamin Berger, Franz-Erich Wolter, Alexander Vais
Article
Computer Science, Interdisciplinary Applications
Karl-Ingo Friese, Sarah B. Cichy, Franz-Erich Wolter, Roman E. Botcharnikov
COMPUTERS & GEOSCIENCES
(2013)
Article
Acoustics
Christian Gerstenberger, Franz-Erich Wolter
JOURNAL OF COMPUTATIONAL ACOUSTICS
(2013)
Article
Computer Science, Software Engineering
Martin Gutschke, Alexander Vais, Franz-Erich Wolter
Article
Computer Science, Software Engineering
Benjamin Berger, Alexander Vais, Franz-Erich Wolter
Article
Computer Science, Software Engineering
Hannes Thielhelm, Alexander Vais, Franz-Erich Wolter
Article
Engineering, Electrical & Electronic
Dan Wu, Bin Wang, Franz-Erich Wolter, Le Xie
Summary: This paper investigates how to compute the shortest path to the voltage stability boundary in the presence of large deviations and proposes a modified optimal control framework and a tri-sectional approximation model to more accurately capture the curvature change of the shortest path using algebraic power flow manifold analysis and computation. Simulation results demonstrate that the tri-sectional approximation model can efficiently and accurately approximate the shortest path to the voltage stability boundary.
IEEE TRANSACTIONS ON POWER SYSTEMS
(2022)
Correction
Engineering, Electrical & Electronic
L. P. Mohasha Isuru Sampath, Yu Weng, Franz-Erich Wolter, Hoay Beng Gooi, Hung Dinh Nguyen
ELECTRIC POWER SYSTEMS RESEARCH
(2023)
Proceedings Paper
Computer Science, Information Systems
Ricardo Manuel Millan-Vaquero, Sean Dean Lynch, Benjamin Fleischer, Jan Rzepecki, Karl-Ingo Friese, Christof Hurschler, Franz-Erich Wolter
BILDVERARBEITUNG FUR DIE MEDIZIN 2015: ALGORITHMEN - SYSTEME - ANWENDUNGEN
(2015)
Proceedings Paper
Engineering, Biomedical
Matthias Becker, Karl-Ingo Friese, Franz-Erich Wolter, Nils-Claudius Gellrich, Harald Essig
2015 IEEE INTERNATIONAL SYMPOSIUM ON MEDICAL MEASUREMENTS AND APPLICATIONS (MEMEA) PROCEEDINGS
(2015)
Proceedings Paper
Computer Science, Artificial Intelligence
Jan Rzepecki, Ricardo Manuel Millan Vaquero, Alexander Vais, Karl-Ingo Friese, Franz-Erich Wolter
ADVANCES IN VISUAL COMPUTING (ISVC 2014), PT II
(2014)
Article
Engineering, Manufacturing
A. Santangelo, P. Blanke, T. Hadifi, F. -E. Wolter, B. -A. Behrens
PRODUCTION ENGINEERING-RESEARCH AND DEVELOPMENT
(2013)
Article
Engineering, Electrical & Electronic
Wandry R. Faria, Gregorio Munoz-Delgado, Javier Contreras, Benvindo R. Pereira Jr
Summary: This paper proposes a new bilevel mathematical model for competitive electricity markets, taking into account the participation of distribution systems operators. A new pricing method is introduced as an alternative to the inaccessible dual variables of the transmission system.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2024)
Article
Engineering, Electrical & Electronic
Chao Zhang, Liwei Zhang, Dong Wang, Kaiyuan Lu
Summary: The load disturbance rejection ability of electrical machine systems is crucial in many applications. Existing studies mainly focus on improving disturbance observers, but the speed response control during the transient also plays a significant role. This paper proposes a sliding mode disturbance observer-based load disturbance rejection control with an adaptive filter and a Smith predictor-based speed filter delay compensator to enhance the transient speed response.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2024)
Article
Engineering, Electrical & Electronic
Arif Hussain, Arif Mehdi, Chul-Hwan Kim
Summary: The proposed scheme in this research paper is a communication-less islanding detection system based on recurrent neural network (RNN) for hybrid distributed generator (DG) systems. The scheme demonstrates good performance in feature extraction, feature selection, and islanding detection, and it also performs effectively in noisy environments.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2024)
Article
Engineering, Electrical & Electronic
Zonghui Sun, Xizheng Guo, Shinan Wang, Xiaojie You
Summary: This paper presents a status pre-matching method (SPM) that eliminates the iterative calculations for resistance switch model, and simulates all operation modes of PECs through a more convenient approach. Furthermore, a FPGA implementation scheme is proposed to fully utilize the multiplier units of FPGA.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2024)
Article
Engineering, Electrical & Electronic
Rui Zhou, Shuheng Chen, Yang Han, Qunying Liu, Zhe Chen, Weihao Hu
Summary: In power system scheduling with variable renewable energy sources, considering both spatial and temporal correlations is a challenging task due to the complex intertwining of spatiotemporal characteristics and computational complexity caused by high dimensionality. This paper proposes a novel probabilistic spatiotemporal scenario generation (PSTSG) method that generates probabilistic scenarios accounting for spatial and temporal correlations simultaneously. The method incorporates Latin hypercube sampling, copula-importance sampling theory, and probability-based scenario reduction technique to efficiently capture the spatial and temporal correlation in the dynamic optimal power flow problem. Numerical simulations demonstrate the superiority of the proposed approach in terms of computational efficiency and accuracy compared to existing methods.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2024)
Article
Engineering, Electrical & Electronic
Juan Manuel Mauricio, J. Carlos Olives-Camps, Jose Maria Maza-Ortega, Antonio Gomez-Exposito
Summary: This paper proposes a simplified thermal model of VSC, which can produce accurate results at a low computational cost. The model consists of a simple first-order thermal dynamics system and two quadratic equations to model power losses. A methodology is also provided to derive the model parameters from manufacturer data.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2024)
Article
Engineering, Electrical & Electronic
Jae-Kyeong Kim, Kyeon Hur
Summary: This paper investigates the relationship between the accuracy of finite difference-based trajectory sensitivity (FDTS) analysis and the perturbation size in non-smooth systems. The study reveals that the approximation accuracy is significantly influenced by the perturbation size, and linear approximation is the most suitable method for practical applications.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2024)
Article
Engineering, Electrical & Electronic
Yuan Si, Amjad Anvari-Moghaddam
Summary: This paper investigates the impact of geomagnetic disturbances on small signal stability in power systems and proposes the installation of blocking devices to mitigate the negative effects. Quantitative evaluation reveals that intense geomagnetic disturbances significantly increase the risk of small signal instability. Optimal placement of blocking devices based on sensitivity scenarios results in a significant reduction in the risk index compared to constant and varying induced geoelectric fields scenarios.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2024)
Article
Engineering, Electrical & Electronic
Xuejian Zhang, Wenxin Kong, Nian Yu, Huang Chen, Tianyang Li, Enci Wang
Summary: The intensity estimation of geomagnetically induced currents (GICs) varies depending on the method used. The estimation using field magnetotelluric (MT) data provides the highest accuracy, followed by the estimation using 3D conductivity models and the estimation using a 1D conductivity model. The GICs in the North China 1000-kV power grid have reached a very high-risk level, with C3 and C4 having a significant impact on the geoelectric field and GICs.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2024)
Article
Engineering, Electrical & Electronic
Yue Pan, Shunjiang Lin, Weikun Liang, Xiangyong Feng, Xuan Sheng, Mingbo Liu
Summary: This paper introduces the concept and model of offshore-onshore regional integrated energy system, and proposes a stochastic optimal dispatch model and an improved state-space approximate dynamic programming algorithm to solve the model. The case study demonstrates the effectiveness and high efficiency of the proposed method in improving economic and environmental benefits.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2024)
Article
Engineering, Electrical & Electronic
Mohammad Eydi, Reza Ghazi, Majid Oloomi Buygi
Summary: Proportional current sharing, voltage restoration, and SOCs balancing in DC microgrid control algorithms are the leading challenges. This paper proposes a novel communication-less control method using a capacitor and a DC/DC converter to stabilize the system and restore the DC bus voltage. The method includes injecting an AC signal into the DC bus, setting the current of energy storage units based on frequency and SOC, and incorporating droop control for system stability. Stability analysis and simulation results validate the effectiveness of the proposed method.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2024)
Article
Engineering, Electrical & Electronic
Xiangjian Meng, Xinyu Shi, Weiqi Wang, Yumin Zhang, Feng Gao
Summary: With the increasing penetration of photovoltaic power generation, regional power forecasting becomes critical for stable and economical operation of power systems. This paper proposes a minute-level regional PV power forecasting scheme using selected reference PV plants. The challenges include the lack of complete historical power data and the heavy computation burden. The proposed method incorporates a novel reference PV plant selection method and a flexible approach to decrease the accumulated error of rolling forecasting.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2024)
Article
Engineering, Electrical & Electronic
Huabo Shi, Yuhong Wang, Xinwei Sun, Gang Chen, Lijie Ding, Pengyu Pan, Qi Zeng
Summary: This article investigates the dynamic stability characteristics of the full size converter variable speed pumped storage unit and proposes improvements for the control strategy. The research is important for ensuring the safe and efficient operation of the unit.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2024)
Article
Engineering, Electrical & Electronic
Firmansyah Nur Budiman, Makbul A. M. Ramli, Houssem R. E. H. Bouchekara, Ahmad H. Milyani
Summary: This paper proposes an optimal harmonic power flow framework for the daily scheduling of a grid-connected microgrid, which addresses power quality issues and ensures effective control through demand side management.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2024)
Article
Engineering, Electrical & Electronic
Cong Zeng, Ziyu Chen, Jizhong Zhu, Fellew Ieee
Summary: This paper introduces a distributed solution method for the multi-objective OPF problem, using a coevolutionary multi-objective evolutionary algorithm and the idea of decomposition. The problem is alleviated by decomposing decision variables and objective functions, and a new distributed fitness evaluation method is proposed. The experimental results demonstrate the effectiveness of the method and its excellence in large-scale systems.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2024)