scholarly journals Identification of different manifestations of nonlinear stick–slip phenomena during creep groan braking noise by using the unsupervised learning algorithms k-means and self-organizing map

2022 ◽  
Vol 166 ◽  
pp. 108349
Author(s):  
Jurij Prezelj ◽  
Jure Murovec ◽  
Severin Huemer-Kals ◽  
Karl Häsler ◽  
Peter Fischer
2020 ◽  
Vol 6 (3) ◽  
pp. 65-70
Author(s):  
R. FARAH DINI QOYYIMAH ◽  
Erfan Rohadi, ST., M. Eng., Ph.D ◽  
Rizky Ardiansyah, S.Kom, MT

Infrastruktur dan sistem informasi merupakan sumber daya manusia yang membantu pemerintah dalam mewujudkan dan pemberdayaan masyarakat baik secara ekonomi maupun kepuasan publik. Tidak terkecuali yang dilakukan pada Dinas Komunikasi dan Informatika Pemerintah Kota Probolinggo. Dalam meningkatkan kualitas pengembangangan infrastruktur secara lebih terkoordinir maka dibuatlah sistem informasi berbasis pemetaan infrastruktur dan sistem informasi dengan menggunakan algoritma clustering SOM. Self Organizing Map (SOM) merupakan salah satu metode dalam Jaringan Syaraf Tiruan (Neural Network) yang menggunakan pembelajaran tanpa pengarahan (Unsupervised Learning). Penelitian ini menghasilkan sebuah website yang memberikan informasi kepada user atau pengguna yang merupakan pihak pemerintahan Dinas Kominfo Kota Probolinggo dalam mengevaluasi perkembangan dan pemerataan infrastruktur dan sistem informasi. Dari hasil perhitungan menggunakan metode Self -Organizing Map dapat diterapkan dalam clustering untuk pemerataan infrastruktur IT yang menghasilkan 3 cluster yang terdiri dari cluster 1 yang memiliki persebaran infrastruktur yang baik berjumlah 1 wilayah, cluster 2 yang memiliki persebaran infrastruktur yang cukup baik berjumlah 23 wilayah dan cluster 3 yang memiliki persebaran infrastrukttur yang kurang baik berjumlah 5 wilayah. Sehingga dapat diketahui pemerataan IT di Kota Probolingo dapat dinilai cukup baik. 4. Berdasarkan pengujian diperoleh hasil akurasi hasil cluster yang baik dengan menggunakan Self-Organizing Map sebanyak 62.06897%. Kata kunci : Clustering, Self Organizing Map (SOM)


Electronics ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 1605 ◽  
Author(s):  
Lyes Khacef ◽  
Laurent Rodriguez ◽  
Benoît Miramond

Cortical plasticity is one of the main features that enable our ability to learn and adapt in our environment. Indeed, the cerebral cortex self-organizes itself through structural and synaptic plasticity mechanisms that are very likely at the basis of an extremely interesting characteristic of the human brain development: the multimodal association. In spite of the diversity of the sensory modalities, like sight, sound and touch, the brain arrives at the same concepts (convergence). Moreover, biological observations show that one modality can activate the internal representation of another modality when both are correlated (divergence). In this work, we propose the Reentrant Self-Organizing Map (ReSOM), a brain-inspired neural system based on the reentry theory using Self-Organizing Maps and Hebbian-like learning. We propose and compare different computational methods for unsupervised learning and inference, then quantify the gain of the ReSOM in a multimodal classification task. The divergence mechanism is used to label one modality based on the other, while the convergence mechanism is used to improve the overall accuracy of the system. We perform our experiments on a constructed written/spoken digits database and a Dynamic Vision Sensor (DVS)/EletroMyoGraphy (EMG) hand gestures database. The proposed model is implemented on a cellular neuromorphic architecture that enables distributed computing with local connectivity. We show the gain of the so-called hardware plasticity induced by the ReSOM, where the system’s topology is not fixed by the user but learned along the system’s experience through self-organization.


Author(s):  
Kazushi Murakoshi ◽  
Satoshi Fujikawa

In order to automatically obtain hierarchical knowledge representation from a certain data, an unsupervised learning method has been developed that overcomes two problems of the growing hierarchical self-organizing map (GHSOM) method, which uses the quantization error, the deviation of the input data, as evaluation measure of the growing maps: proper control of the growth process of each map is difficult due to the use of the quantization error and the clusters in the hierarchical structure may be excessively subdivided. This improved GHSOM method uses the category utility (CU), a measure used in conceptual clustering for predicting the preferred level of categorization, instead of the quantization error. The CU is useful for organizing the clustering so that people can effortlessly understand it. The basic principle of this method is that the growth and unification processes are appropriately and autonomously controlled by the CU. Evaluation using computer experiments showed that the proposed method can automatically construct an appropriate hierarchical and topological knowledge representation for high-dimensional input data through unsupervised learning. It also showed that it is easier to use and more effective than the original conventional GHSOM method using the quantization error as an evaluation measure.


2015 ◽  
Vol 11 (1) ◽  
Author(s):  
Andreas Saputra ◽  
Sri Suwarno ◽  
Lukas Chrisantyo

Self Organizing Map adalah metode jaringan syaraf tiruan (Artificial Neural Network) yang biasa digunakan untuk melakukan proses klasifikasi dengan sifat unsupervised learning atau pelatihan tak terbimbing. Cluster yang akan digunakan akan ditentukan secara manual hanya saja dalam prosesnya data yang masuk akan dikelompokan secara otomatis tanpa adanya intevensi dari sistem. Penelitian ini menerapkan Self Organizing Map untuk melakukan klasifikasi data berupa rekaman suara dengan format file WAV karena merupakan format audio yang belum terkompresi ke dalam sopran, mezzo sopran, alto, tenor, baritone, dan bass. Dalam pengambilan data untuk input melalui proses preemphasis, frame, blocking, dan windowing sebelum dirubah menjadi sinyal diskrit dengan Fast Fourier Transform. Data berupa rata-rata magnitude menjadi input dalam sistem klasifikasi Self Organizing Map. Dalam penelitian ini hasil yang didapat belum sesuai dengan harapan karena data tidak mengelompok dengan baik.Self Organizing Map adalah metode jaringan syaraf tiruan (Artificial Neural Network) yang biasa digunakan untuk melakukan proses klasifikasi dengan sifat unsupervised learning atau pelatihan tak terbimbing. Cluster yang akan digunakan akan ditentukan secara manual hanya saja dalam prosesnya data yang masuk akan dikelompokan secara otomatis tanpa adanya intevensi dari sistem. Penelitian ini menerapkan Self Organizing Map untuk melakukan klasifikasi data berupa rekaman suara dengan format file WAV karena merupakan format audio yang belum terkompresi ke dalam sopran, mezzo sopran, alto, tenor, baritone, dan bass. Dalam pengambilan data untuk input melalui proses preemphasis, frame, blocking, dan windowing sebelum dirubah menjadi sinyal diskrit dengan Fast Fourier Transform. Data berupa rata-rata magnitude menjadi input dalam sistem klasifikasi Self Organizing Map. Dalam penelitian ini hasil yang didapat belum sesuai dengan harapan karena data tidak mengelompok dengan baik.


2016 ◽  
Vol 2016 ◽  
pp. 1-15 ◽  
Author(s):  
Jan Faigl

In this paper, Self-Organizing Map (SOM) for the Multiple Traveling Salesman Problem (MTSP) with minmax objective is applied to the robotic problem of multigoal path planning in the polygonal domain. The main difficulty of such SOM deployment is determination of collision-free paths among obstacles that is required to evaluate the neuron-city distances in the winner selection phase of unsupervised learning. Moreover, a collision-free path is also needed in the adaptation phase, where neurons are adapted towards the presented input signal (city) to the network. Simple approximations of the shortest path are utilized to address this issue and solve the robotic MTSP by SOM. Suitability of the proposed approximations is verified in the context of cooperative inspection, where cities represent sensing locations that guarantee to “see” the whole robots’ workspace. The inspection task formulated as the MTSP-Minmax is solved by the proposed SOM approach and compared with the combinatorial heuristic GENIUS. The results indicate that the proposed approach provides competitive results to GENIUS and support applicability of SOM for robotic multigoal path planning with a group of cooperating mobile robots. The proposed combination of approximate shortest paths with unsupervised learning opens further applications of SOM in the field of robotic planning.


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