• Title/Summary/Keyword: Supervised learning

Search Result 747, Processing Time 0.023 seconds

Fuzzy Neural Network Model Using Asymmetric Fuzzy Learning Rates (비대칭 퍼지 학습률을 이용한 퍼지 신경회로망 모델)

  • Kim Yong-Soo
    • Proceedings of the Korean Institute of Intelligent Systems Conference
    • /
    • 2005.11a
    • /
    • pp.101-105
    • /
    • 2005
  • 본 논문에서는 LVQ(Learning Vector Quantization)을 퍼지화한 새로운 퍼지 학습 법칙을 제안하였다. 퍼지 LVQ 학습 법칙 3은 기존의 학습률 대신에 퍼지 학습률을 사용하였는데, 기존의 LVQ와는 달리 비대칭인 학습률을 사용하였다. 기본의 LVQ에서는 분류가 맞거나 틀렸을 때 같은 학습률을 사용하고 부호만 달랐으나, 새로운 퍼지 학습 법칙에서는 분류가 맞거나 틀렸을 때 부호가 다를 뿐만 아니라 학습률도 다르다. 이 새로운 퍼지 학습 법칙을 무감독 신경회로망인 improved IAFC(Integrated Adaptive Fuzzy Clustering) 신경회로망에 적용하여 감독 신경회로망으로 변형하였다. Improved IAFC 신경회로망은 유연성이 있으면서도 안정성이 있다. 제안한 supervised IAFC 신경회로망 3의 성능과 오류 역전파 신경회로망의 성능을 비교하기 위하여 iris 데이터를 사용하였는데 Supervised IAFC 신경회로망 3가 오류 역전파 신경회로망보다 성능이 우수하였다.

  • PDF

A Study on Improving the predict accuracy rate of Hybrid Model Technique Using Error Pattern Modeling : Using Logistic Regression and Discriminant Analysis

  • Cho, Yong-Jun;Hur, Joon
    • Journal of the Korean Data and Information Science Society
    • /
    • v.17 no.2
    • /
    • pp.269-278
    • /
    • 2006
  • This paper presents the new hybrid data mining technique using error pattern, modeling of improving classification accuracy. The proposed method improves classification accuracy by combining two different supervised learning methods. The main algorithm generates error pattern modeling between the two supervised learning methods(ex: Neural Networks, Decision Tree, Logistic Regression and so on.) The Proposed modeling method has been applied to the simulation of 10,000 data sets generated by Normal and exponential random distribution. The simulation results show that the performance of proposed method is superior to the existing methods like Logistic regression and Discriminant analysis.

  • PDF

Improving the Performance of Supervised Learning Models using Error Pattern Modeling (오차패턴 모델링을 이용한 지도학습 모형에서의 성능 향상)

  • Heo, Jun;Kim, Jong-U
    • Proceedings of the Korean Operations and Management Science Society Conference
    • /
    • 2005.05a
    • /
    • pp.280-286
    • /
    • 2005
  • 본 논문은 이분형 목적변수를 가지는 데이터에서, 의사결정나무나 신경망과 같은 지도 학습(Supervised Learning)의 훈련을 통한 각종 예측 및 분류 정확도를 향상시키기 위해서 오차 패턴을 이용한 새로운 Hybrid 데이터 마이닝 기법을 제안한다. 오차 패턴을 이용한 Hybrid 기법이란 데이터 마이닝의 서로 다른 기법을 각 데이터에 적용한 다음 기법간의 불일치되는 부분만을 다시 패턴화 하여, 이를 최종 모형에 적용하여, 기존에 1개의 방법만을 사용하였을 경우보다, 더욱 좋은 정확도를 가질 수 있도록 하는 방법이다. 본 기법의 검증을 위하여, 10개의 실제 검증용 자료를 사용하였으며, 분석 결과 신경망과 의사결정나무 분석과 같은 기존의 방법보다 전체적으로 예측력이 향상됨을 보였다.

  • PDF

Stock Price Prediction Based on Time Series Network (시계열 네트워크에 기반한 주가예측)

  • Park, Kang-Hee;Shin, Hyun-Jung
    • Korean Management Science Review
    • /
    • v.28 no.1
    • /
    • pp.53-60
    • /
    • 2011
  • Time series analysis methods have been traditionally used in stock price prediction. However, most of the existing methods represent some methodological limitations in reflecting influence from external factors that affect the fluctuation of stock prices, such as oil prices, exchange rates, money interest rates, and the stock price indexes of other countries. To overcome the limitations, we propose a network based method incorporating the relations between the individual company stock prices and the external factors by using a graph-based semi-supervised learning algorithm. For verifying the significance of the proposed method, it was applied to the prediction problems of company stock prices listed in the KOSPI from January 2007 to August 2008.

A Hybrid Data Mining Technique Using Error Pattern Modeling (오차 패턴 모델링을 이용한 Hybrid 데이터 마이닝 기법)

  • Hur, Joon;Kim, Jong-Woo
    • Journal of the Korean Operations Research and Management Science Society
    • /
    • v.30 no.4
    • /
    • pp.27-43
    • /
    • 2005
  • This paper presents a new hybrid data mining technique using error pattern modeling to improve classification accuracy when the data type of a target variable is binary. The proposed method increases prediction accuracy by combining two different supervised learning methods. That is, the algorithm extracts a subset of training cases that are predicted inconsistently by both methods, and models error patterns from the cases. Based on the error pattern model, the Predictions of two different methods are merged to generate final prediction. The proposed method has been tested using practical 10 data sets. The analysis results show that the performance of proposed method is superior to the existing methods such as artificial neural networks and decision tree induction.

Generation of Exemplar Patterns for Training Through the Merge of Supervised and Unsupervised Learning (교사학습과 비교사 학습의 접목에 의한 학습패턴의 생성)

  • Oh, Sang-Hoon
    • Proceedings of the Korea Contents Association Conference
    • /
    • 2004.11a
    • /
    • pp.357-362
    • /
    • 2004
  • In the case that we do not have enough number of training patterns because of limitation such as time consuming, economic problem, and so on, we geneterate a new patterns using the brain-style information processing algorithm, that is, supervised and unsupervised learning methods. The proposed method is verified through the simulation of handwritten digits.

  • PDF

Evaluation of Attribute Selection Methods and Prior Discretization in Supervised Learning

  • Cha, Woon Ock;Huh, Moon Yul
    • Communications for Statistical Applications and Methods
    • /
    • v.10 no.3
    • /
    • pp.879-894
    • /
    • 2003
  • We evaluated the efficiencies of applying attribute selection methods and prior discretization to supervised learning, modelled by C4.5 and Naive Bayes. Three databases were obtained from UCI data archive, which consisted of continuous attributes except for one decision attribute. Four methods were used for attribute selection : MDI, ReliefF, Gain Ratio and Consistency-based method. MDI and ReliefF can be used for both continuous and discrete attributes, but the other two methods can be used only for discrete attributes. Discretization was performed using the Fayyad and Irani method. To investigate the effect of noise included in the database, noises were introduced into the data sets up to the extents of 10 or 20%, and then the data, including those either containing the noises or not, were processed through the steps of attribute selection, discretization and classification. The results of this study indicate that classification of the data based on selected attributes yields higher accuracy than in the case of classifying the full data set, and prior discretization does not lower the accuracy.

Recognition of the Passport by Using Self-Generating Supervised Learning Algorithm (자가 생성 지도 학습 알고리즘을 이용한 여권 인식)

  • Kim, Kyoung-Hwa;Jung, Sung-Ye;Nam, Mi-Young;Kim, Kwang-Baek
    • Proceedings of the Korea Information Processing Society Conference
    • /
    • 2001.10a
    • /
    • pp.567-570
    • /
    • 2001
  • 현재의 출입국 관리자는 여권을 제시하면 여권을 육안으로 검색하고 수작업으로 정보를 입력하여 여권 데이터베이스와 대비하는 것이다. 본 논문에서는 이러한 문제점을 해결하기 위하여 자동으로 여권을 인식할 수 있는 방법을 제안한다. 여권에는 사용자에 대한 많은 정보들이 있는데 여권 영상에서 코드 정보 영역을 히스토그램 방식과 소벨 연산자를 이용하여 코드 영역 및 개별 코드 문자를 추출하고 새로운 자가 생성 지도학습 알고리즘(Self-Generating Supervised Learning Algorithm)을 제안하여 여권 인식에 적응하였다. 10개의 여권 영상을 실험한 결과 모든 코드의 문자 영역이 추출되었고 인식되었다.

  • PDF

FUZZY-FILTER-BASED APPROACH TO RESTORATION OF THE OLD MOVIES

  • Tomohisa-Hoshi;Takashi-Komatsu;Takahiro-Saito
    • Proceedings of the Korean Society of Broadcast Engineers Conference
    • /
    • 1999.06a
    • /
    • pp.29-34
    • /
    • 1999
  • We present a practical method for removing biotches and restoring their mission data. To detect blotches, we employ a robust approach of local analysis of spatiotemporal anisotropic brightness continuity Our approach uses first-order spatiotemporal directional derivatives to select the smoothest direction for each examined pixel, and puts out the incorruption probability that he examined pixel may not be corrupted by blotches. As the restoration filter, were employ a spatiotemporal fuzzy filter whose response is adaptively controlled according to a fuzzy rule defined by the incorruption probability. The fuzzy filter is composed of the two different filter of the identity filter and the spatiotemporal directional-weighted-mean filter, and will put out an intermediate value between the original input brightness and the directional-weighted-mean brightness. We design the fuzzy rule in advance by a standard supervised learning fuzzy rule in advance by a standard supervised learning method. The computer simulations are presented.

Supervised learning framework using Web-Videos (Web-Videos를 사용한 Supervised Learning Framework)

  • Na, Seong-Won;Lee, Ye-Gi;Yoon, Kyoung-ro
    • Proceedings of the Korean Society of Broadcast Engineers Conference
    • /
    • 2019.06a
    • /
    • pp.95-97
    • /
    • 2019
  • 본 논문에서는 비디오 데이터를 이용한 감독 학습 프레임 워크를 제안한다. 최근 Deep Convolutional Neural Networks의 성공으로 많은 분야에서 사용되고 있다. DCNNs 모델 성능의 중요한 요소 중 하나는 Large-cale Dataset을 구축하는 것으로 Small-scale Dataset으로 모델을 학습한다면 과적합 및 일반화 오류를 해결하기 어렵다. 이러한 문제점을 해결하는 방법으로 이미지 왜곡을 통한 데이터 셋을 증가 또는 Dropout 기법 등을 사용하였지만 원본 데이터가 적은 경우에는 모델이 일반화 능력을 갖기 어렵다. 따라서 본 논문에서는 이러한 문제점을 보완하고자 Web으로부터 얻은 비디오에서 해당 Class와 관련된 프레임들을 추출하여 보다 쉽게 데이터 셋을 확장하고, 모델의 성능을 향상 시키는 방법을 제안한다.

  • PDF