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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 & Issues
Volume 11, Issue 4 - Dec 2011
Volume 11, Issue 3 - Sep 2011
Volume 11, Issue 2 - Jun 2011
Volume 11, Issue 1 - Mar 2011
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A New Approach to Solve the TSP using an Improved Genetic Algorithm
Gao, Qian ; Cho, Young-Im ; Xi, Su Mei ;
International Journal of Fuzzy Logic and Intelligent Systems, volume 11, issue 4, 2011, Pages 217~222
DOI : 10.5391/IJFIS.2011.11.4.217
Genetic algorithms are one of the most important methods used to solve the Traveling Salesman Problem. Therefore, many researchers have tried to improve the Genetic Algorithm by using different methods and operations in order to find the optimal solution within reasonable time. This paper intends to find a new approach that adopts an improved genetic algorithm to solve the Traveling Salesman Problem, and compare with the well known heuristic method, namely, Kohonen Self-Organizing Map by using different data sets of symmetric TSP from TSPLIB. In order to improve the search process for the optimal solution, the proposed approach consists of three strategies: two separate tour segments sets, the improved crossover operator, and the improved mutation operator. The two separate tour segments sets are construction heuristic which produces tour of the first generation with low cost. The improved crossover operator finds the candidate fine tour segments in parents and preserves them for descendants. The mutation operator is an operator which can optimize a chromosome with mutation successfully by altering the mutation probability dynamically. The two improved operators can be used to avoid the premature convergence. Simulation experiments are executed to investigate the quality of the solution and convergence speed by using a representative set of test problems taken from TSPLIB. The results of a comparison between the new approach using the improved genetic algorithm and the Kohonen Self-Organizing Map show that the new approach yields better results for problems up to 200 cities.
A Novel Range-free Localization Algorithm for Anisotropic Networks
Lee, Jae-Hun ; Chung, Woo-Yong ; Kim, Eun-Tai ;
International Journal of Fuzzy Logic and Intelligent Systems, volume 11, issue 4, 2011, Pages 223~228
DOI : 10.5391/IJFIS.2011.11.4.223
In this paper, a novel range-free localization algorithm for anisotropic networks is proposed. In the proposed method, the characteristics of the given network are considered and each sensor node estimates the relation between the hop counts and the geographical distances. Unlike most of the previous localization algorithms, the proposed method performs well not only in the isotropic network but also in the anisotropic networks. The proposed method is applied to both isotropic and anisotropic network topologies and the simulation results demonstrate that the method exhibits excellent and robust performances.
A Security Reference Model for the Construction of Mobile Banking Services based on Smart Phones
Shin, Yong-Nyuo ; Shin, Woo-Chang ;
International Journal of Fuzzy Logic and Intelligent Systems, volume 11, issue 4, 2011, Pages 229~237
DOI : 10.5391/IJFIS.2011.11.4.229
As smart phones have become widely adopted, they have brought about changes in individual lifestyles, as well as significant changes in the industry. As the mobile technology of smart phones has become associated with all areas of industry, it is not only accelerating innovation in other industries such as shopping, healthcare service, education, and finance, but is also creating new markets and business opportunities. The preparation of thorough security measures for smart phones is increasing in demand. While offering excellent mobility and convenience, smart phones can be exposed to a range of violation threats. In particular, it is necessary to make efforts to develop a security system that can preemptively cope with potential security threats in the banking service area, which requires a high level of reliability. This paper suggests a security reference model that is considered for the smart phone-based joint mobile banking development project being undertaken by the Bank of Korea in 2010. The purpose of this study is to make a security reference model for a reliable smart phone-based mobile financial service, by recognizing the specific security threats directed toward smart phones, and providing countermeasures to these security threats. The proposed mobile banking security reference model is useful in improving system security by systematically analyzing information security threats to the mobile financial service, and by presenting the guideline for the preparation of countermeasures.
A Semantic Representation Based-on Term Co-occurrence Network and Graph Kernel
Noh, Tae-Gil ; Park, Seong-Bae ; Lee, Sang-Jo ;
International Journal of Fuzzy Logic and Intelligent Systems, volume 11, issue 4, 2011, Pages 238~246
DOI : 10.5391/IJFIS.2011.11.4.238
This paper proposes a new semantic representation and its associated similarity measure. The representation expresses textual context observed in a context of a certain term as a network where nodes are terms and edges are the number of cooccurrences between connected terms. To compare terms represented in networks, a graph kernel is adopted as a similarity measure. The proposed representation has two notable merits compared with previous semantic representations. First, it can process polysemous words in a better way than a vector representation. A network of a polysemous term is regarded as a combination of sub-networks that represent senses and the appropriate sub-network is identified by context before compared by the kernel. Second, the representation permits not only words but also senses or contexts to be represented directly from corresponding set of terms. The validity of the representation and its similarity measure is evaluated with two tasks: synonym test and unsupervised word sense disambiguation. The method performed well and could compete with the state-of-the-art unsupervised methods.
A Short-Term Wind Speed Forecasting Through Support Vector Regression Regularized by Particle Swarm Optimization
Kim, Seong-Jun ; Seo, In-Yong ;
International Journal of Fuzzy Logic and Intelligent Systems, volume 11, issue 4, 2011, Pages 247~253
DOI : 10.5391/IJFIS.2011.11.4.247
A sustainability of electricity supply has emerged as a critical issue for low carbon green growth in South Korea. Wind power is the fastest growing source of renewable energy. However, due to its own intermittency and volatility, the power supply generated from wind energy has variability in nature. Hence, accurate forecasting of wind speed and power plays a key role in the effective harvesting of wind energy and the integration of wind power into the current electric power grid. This paper presents a short-term wind speed prediction method based on support vector regression. Moreover, particle swarm optimization is adopted to find an optimum setting of hyper-parameters in support vector regression. An illustration is given by real-world data and the effect of model regularization by particle swarm optimization is discussed as well.
Fuzzy (r, s)-S
Lee, Seok-Jong ; Kim, Jin-Tae ;
International Journal of Fuzzy Logic and Intelligent Systems, volume 11, issue 4, 2011, Pages 254~258
DOI : 10.5391/IJFIS.2011.11.4.254
In this paper, we introduce the notion of fuzzy (r, s)-S1-pre-semicontinuous mappings on intuitionistic fuzzy topological spaces in
ostak's sense, which is a generalization of
-pre-semicontinuous mappings by Shi-Zhong Bai. The relationship between fuzzy (r, s)-pre-semicontinuous mapping and fuzzy (r, s)-
-pre-semicontinuous mapping is discussed. The characterizations for the fuzzy (r, s)-
-pre-semicontinuous mappings are obtained.
Interval-valued Fuzzy Ideals and Bi-ideals of a Semigroup
Cheong, Min-Seok ; Hur, Kul ;
International Journal of Fuzzy Logic and Intelligent Systems, volume 11, issue 4, 2011, Pages 259~266
DOI : 10.5391/IJFIS.2011.11.4.259
We apply the concept of interval-valued fuzzy sets to theory of semigroups. We give some properties of interval-valued fuzzy ideals and interval-valued fuzzy bi-ideals, and characterize which is left [right] simple, left [right] duo and a semilattice of left [right] simple semigroups or another type of semigroups in terms of interval-valued fuzzy ideals and intervalvalued fuzzy bi-ideals.
Kernel-based actor-critic approach with applications
Chu, Baek-Suk ; Jung, Keun-Woo ; Park, Joo-Young ;
International Journal of Fuzzy Logic and Intelligent Systems, volume 11, issue 4, 2011, Pages 267~274
DOI : 10.5391/IJFIS.2011.11.4.267
Recently, actor-critic methods have drawn significant interests in the area of reinforcement learning, and several algorithms have been studied along the line of the actor-critic strategy. In this paper, we consider a new type of actor-critic algorithms employing the kernel methods, which have recently shown to be very effective tools in the various fields of machine learning, and have performed investigations on combining the actor-critic strategy together with kernel methods. More specifically, this paper studies actor-critic algorithms utilizing the kernel-based least-squares estimation and policy gradient, and in its critic's part, the study uses a sliding-window-based kernel least-squares method, which leads to a fast and efficient value-function-estimation in a nonparametric setting. The applicability of the considered algorithms is illustrated via a robot locomotion problem and a tunnel ventilation control problem.
Observer-based sampled-data controller of linear system for the wave energy converter
Koo, Geun-Bum ; Park, Jin-Bae ; Joo, Young-Hoon ;
International Journal of Fuzzy Logic and Intelligent Systems, volume 11, issue 4, 2011, Pages 275~279
DOI : 10.5391/IJFIS.2011.11.4.275
In this paper, an observer-based sampled-data controller of linear system is proposed for the wave energy converter. Based on the sampled-data observer, the controller is design. In the closed-loop system with controller, it obtains the norm inequality between the continuous-time state variable and the discrete-time one. Using the norm inequality, sufficient condition is derived for the asymptotic stability of the closed-loop system and formulated in terms of linear matrix inequality. Finally, the wave energy converter simulation is provided to verify the effectiveness of the proposed technique.
Position Estimation of Mobile Robots using Multiple Active Sensors with Network
Jin, Tae-Seok ;
International Journal of Fuzzy Logic and Intelligent Systems, volume 11, issue 4, 2011, Pages 280~285
DOI : 10.5391/IJFIS.2011.11.4.280
Recently, with the development of service robots and the concept of ubiquitous, the position estimation of mobile objects has received great interest. Some of the localization schemes are introduced, which provide the relative location of the moving objects subjected to accumulated errors. To implement a real time localization system, a new absolute position estimation method for a mobile robot in indoor environment is proposed. Design and implementation of the localization system comes from the usage of active beacon systems (based upon RFID technology). The active beacon system is composed of an RFID receiver and an ultra-sonic transmitter. The RFID receiver gets the synchronization signal from the mobile robot and the ultra-sonic transmitter sends out the traveling signal to be used for measuring the distance. Position of a mobile robot in a three dimensional space can be calculated basically from the distance information from three beacons and the absolute position information of the beacons themselves. In some case, the mobile robot can acquire the ultrasonic signals from only one or two beacons, due to the obstacles located along the moving path. In this paper, a position estimation scheme using fewer than three sensors is developed. Also, the extended Kalman filter algorithm is applied for the improvement of position estimation accuracy of the mobile robot.
RN-ECC Based Fuzzy Vault for Protecting Fingerprint Templates
Lee, Dae-Jong ; Shin, Yong-Nyuo ; Park, Seon-Hong ; Chun, Myung-Geun ;
International Journal of Fuzzy Logic and Intelligent Systems, volume 11, issue 4, 2011, Pages 286~292
DOI : 10.5391/IJFIS.2011.11.4.286
Biometrics systems are used in a wide range of areas, including the area of crime prevention, due to their unique characteristics. However, serious problems can occur if biometric information is disclosed to an unauthorized user. To address these issues, this paper proposes a real valued fuzzy vault method, which adopts a real number error correction code to implement a fuzzy vault scheme for protecting fingerprint temples. The proposed method provides the benefit of allowing the private key value to be changed at any time, unlike biometric template such as a fingerprint, which is not easily renewable even if its security has been breached. The validity of the proposed method is verified for fingerprint verification.
Rotation Invariant Histogram of Oriented Gradients
Cheon, Min-Kyu ; Lee, Won-Ju ; Hyun, Chang-Ho ; Park, Mignon ;
International Journal of Fuzzy Logic and Intelligent Systems, volume 11, issue 4, 2011, Pages 293~298
DOI : 10.5391/IJFIS.2011.11.4.293
In this paper, we propose a new image descriptor, that is, a rotation invariant histogram of oriented gradients (RIHOG). RIHOG overcomes a disadvantage of the histogram of oriented gradients (HOG), which is very sensitive to image rotation. The HOG only uses magnitude values of a pixel without considering neighboring pixels. The RIHOG uses the accumulated relative magnitude values of corresponding relative orientation calculated with neighboring pixels, which has an effect on reducing the sensitivity to image rotation. The performance of RIHOG is verified via the index of classification and classification of Brodatz texture data.
Rough Approximations on Preordered Sets
Kim, Yong-Chan ; Kim, Young-Sun ;
International Journal of Fuzzy Logic and Intelligent Systems, volume 11, issue 4, 2011, Pages 299~304
DOI : 10.5391/IJFIS.2011.11.4.299
In this paper, we investigate the properties of rough approximations defined by preordered sets. We study the relations among the lower and upper rough approximations, closure and interior systems, and closure and interior operators.
Sparse Reconfigurable Adaptive Filter with an Upgraded Connection Constraint Algorithm
Chang, Hong ; Hwang, Suk-Seung ;
International Journal of Fuzzy Logic and Intelligent Systems, volume 11, issue 4, 2011, Pages 305~309
DOI : 10.5391/IJFIS.2011.11.4.305
A sparse reconfigurable adaptive filter (SRAF) based on a photonic switch determines the appropriate time delays and weight values for an optical switch implementation of tapped-delay-line (TDL) systems. It is well known that the choice of switch delays is significantly important for efficiently implementing the SRAF. If the same values exist as calculating the sum of weight magnitudes for implementing the connection constraint required by the SRAF, conventional connection algorithm based on sequentially selection the maximum elements might not work perfectly. In an effort to increase the effectiveness of system identification, an upgraded connection algorithm used progressive calculation to obtain the better solution is considered in this paper. The performance of the proposed connection constraint algorithm is illustrated by computer simulation for a system identification application.