@inproceedings{MTMT:36313532, title = {Evaluation of Zinc Roughing Process Based on Weighted Density Clustering}, url = {https://m2.mtmt.hu/api/publication/36313532}, author = {Qin, Yali and Xie, Shiwen and Xie, Yongfang}, booktitle = {2025 37th Chinese Control and Decision Conference (CCDC)}, doi = {10.1109/CCDC65474.2025.11090896}, unique-id = {36313532}, year = {2025}, pages = {1592-1597} } @article{MTMT:33447095, title = {An improved image clustering algorithm based on Kernel method and Tchebychev orthogonal moments}, url = {https://m2.mtmt.hu/api/publication/33447095}, author = {Azzouzi, Souad and Hjouji, Amal and EL-Mekkaoui, Jaouad and EL Khalfi, Ahmed}, doi = {10.1007/s12065-022-00734-x}, journal-iso = {EVOL INTELL}, journal = {EVOLUTIONARY INTELLIGENCE}, volume = {16}, unique-id = {33447095}, issn = {1864-5909}, abstract = {In this paper, we introduce a new clustering algorithm called Improved Kernel Possibilistic Fuzzy C-Means algorithm (ImKPFCM), based on the kernel method and possibilistic approach. The proposed ImKPFCM algorithm corrects several FCM, PFCM and GPFCM algorithms shortcomings, reliably detects clustering centers and allows in addition to use Euclidean distance, the employment of other more powerful additional norms able to handle various complex situations. In this study, we applied ImKPFCM algorithm as a new image clustering method on the basis of Tchebychev orthogonal moments to extract feature vectors and then compared it with FCM, PFCM and GPFCM algorithms to evaluate its performance. The comparative study results applied to several image dataset, revealed that the ImKPFCM clustering algorithm improves the clustering accuracy over the FCM, PFCM and GPFCM methods. Therefore, we conclude that the ImKPFCM algorithm is more efficient and produces satisfactory image clustering results.}, keywords = {Fuzzy clustering; Fuzzy c-means (FCM); possibilistic fuzzy c-means (PFCM); Possibilistic C-Means (PCM); Generalized Possibilistic Fuzzy C-Means (GPFCM) Kernel method clustering; Tchebychev orthogonal moments}, year = {2023}, eissn = {1864-5917}, pages = {1237-1258} } @inproceedings{MTMT:33589051, title = {A review on advanced c-means clustering models based on fuzzy logic}, url = {https://m2.mtmt.hu/api/publication/33589051}, author = {Naghi, Mirtill-Boglárka and Kovács, Levente and Szilágyi, László}, booktitle = {IEEE 21st World Symposium on Applied Machine Intelligence and Informatics SAMI (2023) : Proceedings}, doi = {10.1109/SAMI58000.2023.10044530}, unique-id = {33589051}, year = {2023}, pages = {293-298}, orcid-numbers = {Kovács, Levente/0000-0002-3188-0800} } @article{MTMT:33447094, title = {SPCM: Efficient semi-possibilistic c-means clustering algorithm}, url = {https://m2.mtmt.hu/api/publication/33447094}, author = {Mahfouz, Mohamed A.}, doi = {10.3233/JIFS-213172}, journal-iso = {J INTELL FUZZY SYST}, journal = {JOURNAL OF INTELLIGENT & FUZZY SYSTEMS}, volume = {43}, unique-id = {33447094}, issn = {1064-1246}, abstract = {The required division and exponentiation operations needed per iteration for the possibilistic c-means (PCM) clustering algorithm complicate its implementation, especially on homomorphically-encrypted data. This paper presents a novel efficient soft clustering algorithm based on the possibilistic paradigm, termed SPCM. It aims at easing future applications of PCM to encrypted data. It reduces the required exponentiation and division operations at each iteration by restricting the membership values to an ordered set of discrete values in [0,1], resulting in a better performance in terms of runtime and several other performance indices. At each iteration, distances to the new clusters' centers are determined, then the distances are compared to the initially computed and dynamically updated range of values, that divide the entire range of distances associated with each cluster center into intervals (bins), to assign appropriate soft memberships to objects. The required number of comparisons is O(log the number of discretization levels). Thus, the computation of centers and memberships is greatly simplified during execution. Also, the use of discrete values for memberships allows soft modification (increment or decrement) of the soft memberships of identified outliers and core objects instead of rough modification (setting to zero or one) in related algorithms. Experimental results on synthetic and standard test data sets verified the efficiency and effectiveness of the proposed algorithm. The average percent of the achieved reduction in runtime is 35% and the average percent of the achieved increase in v-measure, adjusted mutual information, and adjusted rand index is 6% on five datasets compared to PCM. The larger the dataset, the higher the reduction in runtime. Also, SPCM achieved a comparable performance with less computational complexity compared to variants of related algorithms.}, keywords = {Fuzzy clustering; Clustering algorithms; Homomorphic encryption; Possibilistic C-means; hybrid soft clustering}, year = {2022}, eissn = {1875-8967}, pages = {7227-7241} }