• The Transactions of the Korean Institute of Electrical Engineers A
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• v.48 no.11
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• pp.1382-1387
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• 1999

This paper presents an optimal fuzzy power system stabilizer to damp out low frequency oscillation. So far fuzzy controllers have been applied to power system stabilizing controllers due to its excellent properties on the nonlinear systems. But the design process of fuzzy logic power system stabilizer requires empirical and heuristic knowledge of human experts as well as many trial-and-errors in general. This paper presents and optimal design method of the fuzzy logic stabilizer using the genetic algorithm. Non-symmetric membership functions are optimally tuned over an evaluation function. The present inputs of fuzzy stabilizer are torque angle error and the change of torque angle error without loss of generality. The coding method used in this paper is concatenated binary mapping. Each linguistic fuzzy variable, defined as the peak of a membership function, is assigned by the mapping from a minimum value to a maximum value using eight bits. The tournament selection and the elitism are used to keep the worthy individuals in the next generation. The proposed system is applied to the one-machine infinite-bus model of a power system, and the results showed a promising possibility.

• Journal of Environmental Impact Assessment
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• v.20 no.3
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• pp.357-365
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• 2011

The QUAL2K has the same basic characteristics as the QUAL2E model, which has been widely used in stream water quality modeling; in QUAL2K, however, various functions are supplemented. The QUAL2Kw model uses a genetic algorithm(GA) for automatic calibration of QUAL2K, and it can search for optimum water quality parameters efficiently using the calculation results of the model. The QUAL2Kw model was applied to the Gangneung Namdaecheon River on the east side of the Korean Peninsula. Because of the effluents from the urban area, the middle and lower parts of the river are more polluted than the upper parts. Moreover, the hydraulic characteristics differ between the lower and upper parts of rivers. Thus, the river reaches were divided into seven parts, auto-calibration for the multiple reaches was performed using the function of the user-defined automatic calibration of the rates worksheets. Because GA parameters affect the optimal solution of the model, the impact of the GA parameters used in QUAL2Kw on the fitness of the model was analyzed. Sensitivity analysis of various factors, such as population size, crossover probability, crossover mode, strategy for mutation and elitism, mutation rate, and reproduction plan, were performed. Using the results of this sensitivity analysis, the optimum GA parameters were selected to achieve the best fitness value.

• Journal of the Korean Society of Costume
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• v.63 no.8
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• pp.14-26
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• 2013

The purpose of this study is to compare and analyze Jacqueline Kennedy and Michelle Obama's fashion style from a perspective of modernism and postmodernism. The method utilized in this study was first, to examine the properties of modernism and postmodernism. Next, we explored the types of role performance of the first ladies and the application of their fashion as an aid to their roles through the precedents of the research concerning modernism and postmodernism. The results of the study are as follows. First, there was a trend of formalism and anti-formalism. Jacqueline Kennedy made her public appearances wearing a formal dress in order to express the first lady's authoritarian figure of restrained elegance. The fashion of the first lady aspired to formalism. Meanwhile, Michelle Obama followed more of a free style by eschewing the typical formality of the first lady. She created diverse styles utilizing a variety of items, which were not interrupted by form or by using heterogeneous items. Second, there is a trend of elitism and populism. While Jacqueline Kennedy preferred only haute couture designers' costume in order to show the prestige and dignity of the upper class, Michelle Obama patronized unknown designers' clothing or mid-level casual brand goods that the public favors in order to interact with the public through her fashion. Third, while modernism regards totality or unity to be important, postmodernism puts an emphasis on the eclecticism by pursuing complexity and diversity through the deconstruction of an indigenous genre. In case of Jacqueline Kennedy, this tendency featured monotone clothing color, which presented a unified full set dress that excluded decoration. Michelle Obama, in contrast, mixed and matched formal dresses and a casual cardigan or felicitously mixed luxury brand or low to middle priced brand goods.

• The Journal of Art Theory & Practice
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• no.15
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• pp.31-49
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• 2013

This paper delves into the recent 'paintings' of African-American artist David Hammons, which combine rubbish-like plastic wraps with the abstract-expressionist style paintings. In straddling between rubbish and art object, his works tend to blur the boundary drawn between two opposite categories in value, art and garbage, provoking the sophisticated taste of Upper-East-side white community in Manhattan, New York. Choosing the venue of his exhibition at a commercial gallery, Hammons's creative efforts is also a critique of what can be seen as the dominance of abstract expressionism and white elitism in American art history. The artist is known for his use of unconventional materials in art making such as black hair, barbecue bones, and elephant droppings, ones that are often associated with African-American experiences in all different levels. Since his debut in the art scene in the 1970s, Hammons has pursued the view of art-making as a medium for provoking contentious issues of racial relations in the States. On the other hand, the reception of Hammons's work as African-American art can be potentially quite limiting, overlooking as it does multi-faceted meanings of his art practice. His unconventional approach to art often took him outside art galleries and museums, where he was seen using a variety of common materials for site-specific installations and performances. Staged in different parts of Manhattan, these acts of art making traverse seemingly opposite communities and cultures, often blurring their boundaries. Hammons's artistic practice can label him what Abdul Jan Mohamed calls "specular border intellectual", revealing as it does the symbiosis of binary oppositions that is basic to the experience of communnal living.

• Journal of Korean Society of Steel Construction
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• v.24 no.6
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• pp.701-710
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• 2012

We present optimum design for truss and frame structures subject to constraints on stresses, displacement, and natural frequency. The optimum design procedure is used discrete and continuous design variables and Genetic Algorithms. Genetic Algorithms is used the method of Elitism and penalty parameters in order to improved fitness in the reproduction process, and optimum design is used steel(W-section) and pre-made discrete cross-section. Truss and frame structures optimization examples are used for 10-Bar truss, 25-Bar truss, 1-bay 2-story frame, 1-bay 7-story frame, and these examples are employed to demonstrate the availability and serviceability of Genetic Algorithms for solving optimum design of truss and frame.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.32 no.11A
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• pp.1079-1085
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• 2007

This Paper Proposes a new optimization algorithm named by GBNSGA-II(Goal-pareto Based Non-dominated Sorting Genetic Algorithm-II) which uses Goal Programming to find non-dominated solutions in NSGA-II. Although the conventional NSGA is very popular to solve multiobjective optimization problem, its high computational complexity, lack of elitism and difficulty of selecting sharing parameter have been considered as problems to be overcome. To overcome these problems, NSGA-II has been introduced as the alternative for multiobjective optimization algorithm preventing aforementioned defects arising in the conventional NSGA. Together with advantageous features of NSGA-II, this paper proposes rather effective optimization algorithm formulated by purposely combining NSGA-II algorithm with GP (Goal Programming) subject to satisfying multiple objectives as possible as it can. By conducting computer simulations, the superiority of the proposed GBNSGA-II algorithm will be verified in the aspects of the effectiveness on optimization process in presence of a priori constrained goals and its fast converging capability.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.39 no.4
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• pp.10-18
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• 2002

Network topology design is a multiobjective problem with various design components. The components such as cost, message delay and reliability are important to gain the best performance. Recently, Genetic Algorithms(GAs) have been widely used as an optimization method for real-world problems such as combinatorial optimization, network topology design, and so on. This paper proposed a method of Multi-objective GA for Design of the network topology which is to minimize connection cost and message delay time. A common difficulty in multiobjective optimization is the existence of an objective conflict. We used the prufer number and cluster string for encoding, parato elimination method and niche-formation method for the fitness sharing method, and reformation elitism for the prevention of pre-convergence. From the simulation, the proposed method shows that the better candidates of network architecture can be found.

• Journal of Elementary Mathematics Education in Korea
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• v.19 no.1
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• pp.107-121
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• 2015

The purpose of the present study is to find out some implications from comparing mathematical education of Israel and Singapore. This study examined what values are represented in schooling of both Israel and Singapore and what factors are influencing mathematics teacher education of both countries. Education in Israel and Singapore plays a significant role for the survival of the nation and economic success, and the education system is focused on elitism, especially in terms that they have selective system of students and restrictive exams from the elementary school level. The educational system in both countries provides students with little opportunities for social mobility, because students from the low SES families are not equally exposed to educational facilities and experiences. The results of this study imply that the critical factor affecting students achievement in Israel and Singapore seems to be the quality of teacher education system and the quality of teachers. In particular, it seems that we need to be very careful of uncritically adopting mathematical ideas from both Israel and Singapore, because they both have very different contexts of educational goals, educational policies, racial and cultural factors from Korea.

• Journal of KIISE
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• v.43 no.2
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• pp.204-211
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• 2016

In this paper, we propose an automatic melody composition system that can generate a sophisticated melody by adding non-harmony tone in the given chord progression. An overall procedure consists of two steps, which are the rhythm generation and melody generation parts. In the rhythm generation part, we designed new fitness functions for rhythm that can be controlled by a user setting parameters. In the melody generation part, we designed new fitness functions for melody based on harmony theory. We also designed evolutionary operators that are conducted by considering a musical context to improve computational efficiency. In the experiments, we compared four metaheuristics to optimize the rhythm fitness functions: Simple Genetic Algorithm (SGA), Elitism Genetic Algorithm (EGA), Differential Evolution (DE), and Particle Swarm Optimization (PSO). Furthermore, we compared proposed genetic algorithm for melody with the four algorithms for verifying performance. In addition, composition results are introduced and analyzed with respect to musical correctness.

• Journal of the Korean Society of Clothing and Textiles
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• v.21 no.8
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• pp.1427-1438
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• 1997

The art plastique is the part from which designers draw their inspirations to create fashion design. Many designers look for their inspirations from Art Plastique. Since the early 20th century, lots of designers led by Paul Poiret drew their inspirations from Art and co-works with artists. The direct involvement of those artists helped to position Fashion to be an art. Also, these co-works brought the mass media's attention and commercial profit. The most prevalent relationship between the fashion design and art plastique is the reproduction of art such as the 1960s 'Pop Art printed on T-shirts, which can be seen easily todays. After World War ll, art was popularized in a new society where young generation played a major role. Pop Art having image of the freedom and the rejection of tradition was considered as the major trend of 1960s. This study considers reflection of anti-traditionalism, anti-elitism and popularity as the kitsch of Pop. That is the attraction which youth culture looked for from Pop Art and the reason that 60's avast-garde cloth could position itself into the masses. Therefore, this study examines the influence of the kitsch of Pop and the expression of parody upon the major changes in 1960s fashion from which are the mini-look and women's trousers wearing. This study examines Andra Courreges who led 1960s Mini look and Yves Saint Laurent who introduced Pop dress, Smoking look and transparent blouse to find the way which makes it possible for avant garde fashion to have a close relationship with the public and to position itself to be a art.