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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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International Journal of Fuzzy Logic and Intelligent Systems
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Korean Institute of Intelligent Systems
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Volume 7, Issue 4 - Dec 2007
Volume 7, Issue 3 - Sep 2007
Volume 7, Issue 2 - Jun 2007
Volume 7, Issue 1 - Mar 2007
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A Modified Approach to Density-Induced Support Vector Data Description
Park, Joo-Young ; Kang, Dae-Sung ;
International Journal of Fuzzy Logic and Intelligent Systems, volume 7, issue 1, 2007, Pages 1~6
DOI : 10.5391/IJFIS.2007.7.1.001
The SVDD (support vector data description) is one of the most well-known one-class support vector learning methods, in which one tries the strategy of utilizing balls defined on the feature space in order to distinguish a set of normal data from all other possible abnormal objects. Recently, with the objective of generalizing the SVDD which treats all training data with equal importance, the so-called D-SVDD (density-induced support vector data description) was proposed incorporating the idea that the data in a higher density region are more significant than those in a lower density region. In this paper, we consider the problem of further improving the D-SVDD toward the use of a partial reference set for testing, and propose an LMI (linear matrix inequality)-based optimization approach to solve the improved version of the D-SVDD problems. Our approach utilizes a new class of density-induced distance measures based on the RSDE (reduced set density estimator) along with the LMI-based mathematical formulation in the form of the SDP (semi-definite programming) problems, which can be efficiently solved by interior point methods. The validity of the proposed approach is illustrated via numerical experiments using real data sets.
A NEW APPROACH TO FUZZY CONGRUENCES
Hur, Kul ; Jang, Su-Youn ; Lee, Keon-Chang ;
International Journal of Fuzzy Logic and Intelligent Systems, volume 7, issue 1, 2007, Pages 7~16
DOI : 10.5391/IJFIS.2007.7.1.007
First, we investigate fuzzy equivalence relations on a set X in the sense of Youssef and Dib. Second, we discuss fuzzy congruences generated by a given fuzzy relation on a fuzzy groupoid. In particular, we obtain the characterizations of
FC(S) for any two fuzzy congruences
on a fuzzy groupoid (
). Finally, we study the lattice of fuzzy equivalence relations (congruences) on a fuzzy semigroup and give certain lattice theoretic properties.
Bluetooth Network for Group Behavior of Multi-Agent Robotic System
Seo, Sang-Wook ; Ko, Kwang-Eun ; Hwang, Se-Hee ; Jang, In-Hun ; Sim, Kwee-Bo ;
International Journal of Fuzzy Logic and Intelligent Systems, volume 7, issue 1, 2007, Pages 17~21
DOI : 10.5391/IJFIS.2007.7.1.017
Multi-Agent Robotic System (MARS) is a system that independent autonomous robots in the restricted environments infer their status from pre-assigned conditions and operate their jobs through the cooperation with each other. In the MARS, a robot contains sensor part to percept the situation around themselves, communication part to exchange information, and actuator part to do given work. Especially, in order to cooperate with other robots, communicating with other robots is one of the essential elements. Because Bluetooth has many advantages such as low power consumption, small size module package, and various standard protocols, Bluetooth is rated as one of the efficient communicating technologies which can apply to small-sized robot system. In this paper, we will develop Bluetooth communicating system for autonomous robots. For the purpose, the communication system must have several features-separated module, flexible interface. We will discuss how to construct and what kind of procedure to develop the communicating system.
BOXES-based Cooperative Fuzzy Control for Cartpole System
Kwon, Sung-Gyu ;
International Journal of Fuzzy Logic and Intelligent Systems, volume 7, issue 1, 2007, Pages 22~29
DOI : 10.5391/IJFIS.2007.7.1.022
Two fuzzy controllers defined by 2 input variables cooperate to control a cartpole system in terms of balancing as well as centering. The cooperation is due to the BOXES scheme that selects one of the fuzzy controllers for each time step according to the content of box that is established through the critic of the control action by the fuzzy controllers. It is found that the control scheme is good at controlling the cartpole system so that the system is stabilized fast while the BOXES develops its ability to select proper fuzzy controller through experience.
Common fixed point theorem for a sequence of mappings in intuitionistic fuzzy metric space
Park, Jong-Seo ; Kang, Hong-Jae ;
International Journal of Fuzzy Logic and Intelligent Systems, volume 7, issue 1, 2007, Pages 30~33
DOI : 10.5391/IJFIS.2007.7.1.030
Park and Kim , Grabiec  studied a fixed point theorem in fuzzy metric space, and Vasuki  proved a common fixed point theorem in a fuzzy metric space. Park, Park and Kwun  defined the intuitionistic fuzzy metric space in which it is a little revised in Park`s definition. Using this definition, Park, Kwun and Park  and Park, Park and Kwun  proved a fixed point theorem in intuitionistic fuzzy metric space. In this paper, we will prove a common fixed point theorem for a sequence of mappings in a intuitionistic fuzzy metric space. Our result offers a generalization of Vasuki`s results .
Controllability for the Semilinear Fuzzy Integrodifferential Equations with Nonlocal Conditions and Forcing Term with Memory
Yoon, Joung-Hahn ; Kwun, Young-Chel ; Park, Jong-Seo ; Park, Jin-Han ;
International Journal of Fuzzy Logic and Intelligent Systems, volume 7, issue 1, 2007, Pages 34~40
DOI : 10.5391/IJFIS.2007.7.1.034
Balasubramaniam and Muralisankar (2004) proved the existence and uniqueness of fuzzy solutions for the semilinear fuzzy integrodifferential equations with nonlocal initial condition. Park et al. (2006) found the sufficient condition of this system. Recently, Kwun et al. (2006) proved the existence and uniqueness of solutions for the semilinear fuzzy integrodifferential equations with nonlocal initial conditions and forcing term with memory in
. In this paper, we study the controllability for this system by using the concept of fuzzy number whose values are normal, convex, upper semicontinuous and compactly supported interval in
DIND Data Fusion with Covariance Intersection in Intelligent Space with Networked Sensors
Jin, Tae-Seok ; Hashimoto, Hideki ;
International Journal of Fuzzy Logic and Intelligent Systems, volume 7, issue 1, 2007, Pages 41~48
DOI : 10.5391/IJFIS.2007.7.1.041
Latest advances in network sensor technology and state of the art of mobile robot, and artificial intelligence research can be employed to develop autonomous and distributed monitoring systems. In this study, as the preliminary step for developing a multi-purpose "Intelligent Space" platform to implement advanced technologies easily to realize smart services to human. We will give an explanation for the ISpace system architecture designed and implemented in this study and a short review of existing techniques, since there exist several recent thorough books and review paper on this paper. Instead we will focus on the main results with relevance to the DIND data fusion with CI of Intelligent Space. We will conclude by discussing some possible future extensions of ISpace. It is first dealt with the general principle of the navigation and guidance architecture, then the detailed functions tracking multiple objects, human detection and motion assessment, with the results from the simulations run.
Lee, Seok-Jong ; Kim, Jin-Tae ;
International Journal of Fuzzy Logic and Intelligent Systems, volume 7, issue 1, 2007, Pages 49~57
DOI : 10.5391/IJFIS.2007.7.1.049
Using the idea of degree of openness and degree of nonopenness, Coker and Demirci  defined intuitionistic fuzzy topological spaces in Sostak`s sense as a generalization of smooth topological spaces and intuitionistic fuzzy topological spaces. M. N. Mukherjee and S. P. Sinha  introduced the concept of fuzzy irresolute maps on Chang`s fuzzy topological spaces. In this paper, we introduce the concepts of fuzzy (r,s)-irresolute, fuzzy (r,s)-presemiopen, fuzzy almost (r,s)-open, and fuzzy weakly (r,s)-continuous maps on intuitionistic fuzzy topological spaces in Sostak`s sense. Using the notions of fuzzy (r,s)-neighborhoods and fuzzy (r,s)-semineighborhoods of a given intuitionistic fuzzy points, characterizations of fuzzy (r,s)-irresolute maps are displayed. The relations among fuzzy (r,s)-irresolute maps, fuzzy (r,s)-continuous maps, fuzzy almost (r,s)-continuous maps, and fuzzy weakly (r,s)-cotinuous maps are discussed.
Movement Pattern Recognition of Medaka for an Insecticide: A Comparison of Decision Tree and Neural Network
Kim, Youn-Tae ; Park, Dae-Hoon ; Kim, Sung-Shin ;
International Journal of Fuzzy Logic and Intelligent Systems, volume 7, issue 1, 2007, Pages 58~65
DOI : 10.5391/IJFIS.2007.7.1.058
Behavioral sequences of the medaka (Oryzias latipes) were continuously investigated through an automatic image recognition system in response to medaka treated with the insecticide and medaka not treated with the insecticide, diazinon (0.1 mg/l) during a 1 hour period. The observation of behavior through the movement tracking program showed many patterns of the medaka. After much observation, behavioral patterns were divided into four basic patterns: active-smooth, active-shaking, inactive-smooth, and inactive-shaking. The "smooth" and "shaking" patterns were shown as normal movement behavior. However, the "shaking" pattern was more frequently observed than the "smooth" pattern in medaka specimens that were treated with insecticide. Each pattern was classified using classification methods after the feature choice. It provides a natural way to incorporate prior knowledge from human experts in fish behavior and contains the information in a logical expression tree. The main focus of this study was. to determine whether the decision tree could be useful for interpreting and classifying behavior patterns of the medaka.
Some characterizations of a mapping defined by interval-valued Choquet integrals
Jang, Lee-Chae ; Kim, Hyun-Mee ;
International Journal of Fuzzy Logic and Intelligent Systems, volume 7, issue 1, 2007, Pages 66~70
DOI : 10.5391/IJFIS.2007.7.1.066
Note that Choquet integral is a generalized concept of Lebesgue integral, because two definitions of Choquet integral and Lebesgue integral are equal if a fuzzy measure is a classical measure. In this paper, we consider interval-valued Choquet integrals with respect to fuzzy measures(see [4,5,6,7]). Using these Choquet integrals, we define a mappings on the classes of Choquet integrable functions and give an example of a mapping defined by interval-valued Choquet integrals. And we will investigate some relations between m-convex mappings
on the class of Choquet integrable functions and m-convex mappings
, defined by the class of closed set-valued Choquet integrals with respect to fuzzy measures.
Steganography based Multi-modal Biometrics System
Go, Hyoun-Joo ; Moon, Dae-Sung ; Moon, Ki-Young ; Chun, Myung-Geun ;
International Journal of Fuzzy Logic and Intelligent Systems, volume 7, issue 1, 2007, Pages 71~76
DOI : 10.5391/IJFIS.2007.7.1.071
This paper deals with implementing a steganography based multi-modal biometric system. For this purpose, we construct a multi-biometrics system based on the face and iris recognition. Here, the feature vector of iris pattern is hidden in the face image. The recognition system is designed by the fuzzy-based Linear Discriminant Analysis(LDA), which is an expanded approach of the LDA method combined by the theory of fuzzy sets. Furthermore, we present a watermarking method that can embed iris information into face images. Finally, we show the advantages of the proposed watermarking scheme by computing the ROC curves and make some comparisons recognition rates of watermarked face images with those of original ones. From various experiments, we found that our proposed scheme could be used for establishing efficient and secure multi-modal biometric systems.
Takagi-Sugeno Fuzzy Integral Control for Asymmetric Half-Bridge DC/DC Converter
Chung, Gyo-Bum ;
International Journal of Fuzzy Logic and Intelligent Systems, volume 7, issue 1, 2007, Pages 77~84
DOI : 10.5391/IJFIS.2007.7.1.077
In this paper, Takagi-Sugeno (TS) fuzzy integral control is investigated to regulate the output voltage of an asymmetric half-bridge (AHB) DC/DC converter; First, we model the dynamic characteristics of the AHB DC/DC converter with state-space averaging method and small perturbation at an operating point. After introducing an additional integral state of the output regulation error, we obtain the
-order TS fuzzy model of the AHB DC/DC converter. Second, the concept of the parallel distributed compensation is applied to design the fuzzy integral controller, in which the state feedback gains are obtained by solving the linear matrix inequalities (LMIs). Finally, simulation results are presented to show the performance of the considered design method as the output voltage regulator and compared to the results for which the conventional loop gain method is used.
Weighted average of fuzzy numbers under T
(the weakest t-norm)-based fuzzy arithmetic operations
Hong, Dug-Hun ; Kim, Kyung-Tae ;
International Journal of Fuzzy Logic and Intelligent Systems, volume 7, issue 1, 2007, Pages 85~89
DOI : 10.5391/IJFIS.2007.7.1.085
Many authors considered the computational aspect of sup-min convolution when applied to weighted average operations. They used a computational algorithm based on a-cut representation of fuzzy sets, nonlinear programming implementation of the extension principle, and interval analysis. It is well known that
(the weakest t-norm)-based addition and multiplication preserve the shape of L-R type fuzzy numbers. In this paper, we consider the computational aspect of the extension principle by the use of
when the principle is applied to fuzzy weighted average operations. We give the exact solution for the case where variables and coefficients are L-L fuzzy numbers without programming or the aid of computer resources.