نتایج جستجو برای: خوشهبندی som

تعداد نتایج: 8769  

2016
Cynthia M. Kallenbach Serita D. Frey A. Stuart Grandy

Soil organic matter (SOM) and the carbon and nutrients therein drive fundamental submicron- to global-scale biogeochemical processes and influence carbon-climate feedbacks. Consensus is emerging that microbial materials are an important constituent of stable SOM, and new conceptual and quantitative SOM models are rapidly incorporating this view. However, direct evidence demonstrating that micro...

2001
Jouko Lampinen Timo Kostiainen

The Self-Organizing Map, SOM, is a widely used tool in exploratory data analysis. A theoretical and practical challenge in the SOM has been the diffi­ culty to treat the method as a statistical model fitting procedure. In this chapter we give a short review of statistical approaches for the SOM. Then we present the probability density model for which the SOM training gives the maximum likeli­ h...

2015
Erick Alfons Lisangan Aina Musdholifah Sri Hartati

Recently, clustering algorithms combined conventional methods and artificial intelligence. FSCSOM is designed to handle the problem of SOM, such as defining the number of clusters and initial value of neuron weights. FSC find the number of clusters and the cluster centers which become the parameter of SOM. FSC-SOM is expected to improve the quality of FSC since the determination of the cluster ...

2012
Tonny J. Oyana Luke E. K. Achenie Joon Heo

The objective of this paper is to introduce an efficient algorithm, namely, the mathematically improved learning-self organizing map (MIL-SOM) algorithm, which speeds up the self-organizing map (SOM) training process. In the proposed MIL-SOM algorithm, the weights of Kohonen's SOM are based on the proportional-integral-derivative (PID) controller. Thus, in a typical SOM learning setting, this i...

2011
Brent W. Roeder Kris Gaj Andre Manitius

A HARDWARE IMPLEMENTATION OF THE SOM FOR A NETWORK INTRUSION DETECTION SYSTEM Brent W. Roeder, B.S. Virginia Tech, 2005 Thesis Director: Dr. Kris Gaj This thesis describes the research and development of a hardware implementation of the self organizing map (SOM) for a network intrusion detection system. As part of the thesis research, Kohonen’s SOM algorithm was examined and different hardware ...

2012
Z. Mohd Zin Zalhan Mohd Zin

The Self Organizing Maps (SOM) is regarded as an excellent computational tool that can be used in data mining and data exploration processes. The SOM usually create a set of prototype vectors representing the data set and carries out a topology preserving projection from high-dimensional input space onto a low-dimensional grid such as two-dimensional (2D) regular grid or 2D map. The 2D-SOM tech...

2015
Lu Zhen

Service-Oriented Manufacturing (SOM) strategy is a new manufacturing mode by integrating servitization with the traditional manufacturing industry. The advantages and importance of the SOM strategy are gradually recognized by more and more enterprises. However, the enterprises’ specific cost structures and cost configurations for providing customized services have influences on the decisions ab...

2012
Hsin-Chang Yang Chung-Hong Lee

The self-organizing map (SOM) model is a well-known neural network model with wide spread of applications. The main characteristics of SOM are two-fold, namely dimension reduction and topology preservation. Using SOM, a high-dimensional data space will be mapped to some low-dimensional space. Meanwhile, the topological relations among data will be preserved. With such characteristics, the SOM w...

Journal: :IEICE Transactions 2008
Haruna Matsushita Yoshifumi Nishio

In the real world, it is not always true that the nextdoor house is close to my house, in other words, “neighbors” are not always “true neighbors”. In this study, we propose a new Self-Organizing Map (SOM) algorithm, SOM with False Neighbor degree between neurons (called FN-SOM). The behavior of FN-SOM is investigated with learning for various input data. We confirm that FN-SOM can obtain the m...

2016
Fred Nyberg

Nyberg F. Structural plasticity of the brain to psychostimulant use. Neuropharmacology. 2014; 87:115-124. Beroendeframkallande droger som de centrakstimulerande amfetamin, kokain, ecstasy, metyfenidater och även nikotin bidrar till förändringar i olika beteenden men också i hjärnans kemi och stuktur. De har vistas orsaka långvarig påverkan på nervcellernas dendriter och strukturer I regioner so...

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