• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.7 no.4
• /
• pp.767-778
• /
• 2003

This paper presents a method for generating optimal fuzzy rules using a genetic algorithm. Fuzzy rules are generated from the training data in the first stage. In this stage, fuzzy c-Means clustering method and cluster validity are used to determine the structure and initial parameters of the fuzzy inference system. A cluster validity is used to determine the number of clusters, which can be the number of fuzzy rules. Once the structure is figured out in the first stage, parameters relating the fuzzy rules are optimized in the second stage. Weights and variance parameters are tuned using genetic algorithms. Variance parameters are also managed with left and right for asymmetrical Gaussian membership function. The method ensures convergence toward a global minimum by using genetic algorithms in weight and variance spaces.

• Journal of KIISE:Software and Applications
• /
• v.26 no.3
• /
• pp.365-379
• /
• 1999

본 논문에서는 객체지향 데이터베이스의 클래스 계층에 대한 색인기법으로 이차원 색인구조를 이용하여 조율 가능한 이차원 클래스 색인기법인 2D-CHI를 제안한다. 2D-CHI 에서는 색인된 속성의 키값 도메인과 클래스 식별자 도메인으로 구성된 이차원 도메인상의 색인엔트리들에 대한 클러스터링 문제를 다룬다. 클러스터링 특성이 하나의 속성에 의해서 독점되는 B+-Tree 와 같은 일차원 색인구조를 이용하는 기존의 클래스 색인기법들은 특정 형태의 질의에 대해서만 적합한 색인기법들로서 다양한 형태의 질의들로 구성된 질의 패턴에 대해서 적절하게 대응하지 못한다. 2D-CHI에서는 질의 피턴에 따라 키값 도메인과 클래스 식별자 도메인 사이에서 색이 엔트리들의 클러스터링 정도를 조정함으로써 질의처리의 성능을 향상시킨다. 2D-CHI 의 성능평가를 위하여, 먼저 데이터의 균일 분포를 가정으로 비용 모델을 정립하여 기존의 색인기법들과 색인의 성능을 비교한다. 그리고, 계층 그리드 파일을 이용하여 구현한 2D-CHI의 실험으로 비용 모델을 검증하며, 다양한 실험을 통하여 데이터의 분포와 주어진 질의 형태에 따라 최적의 이차원 클래스 계층 색인구조를 구성할 수 있음을 보인다.

• The Korean Journal of Applied Statistics
• /
• v.29 no.3
• /
• pp.463-470
• /
• 2016

In analysing a time series on the frequency domain, the spectral estimator (or periodogram) is a very useful statistic to identify the periods of a time series. However, the spectral estimator is very sensitive in nature to outliers, so that the spectral estimator in terms of M-estimation has been studied by some researchers. Pak (2001) proposed an empirical method to choose a tuning parameter for the Huber's M-estimating function. In this article, we try to implement Pak's estimation proposal in the spectral estimator. We use the Korean housing price index as an example data set for comparing various M-estimating results.

• Journal of Korean Society of Steel Construction
• /
• v.12 no.1 s.44
• /
• pp.93-102
• /
• 2000

Substructuring-based hierarchical approach for design analysis and optimization of structural frames is presented in this study. The conceptual framework of this method is in the hierarchical modeling for design processes as well as structural systems and the methodology combining substructuring analysis and multilevel optimization. Mathematical models for analysis and synthesis are established on the common basis of substructuring systems. Modularized behavioral analysis, design sensitivity analysis and optimization are linked and integrated on the mathematical and structural basis of substructuring. Substructures are coordinated with the active constraints for system level and the weight ratio criteria. Numerical examples for test frames show the validity and effectiveness of the present approach.

• Korean Journal of Adult Nursing
• /
• v.17 no.3
• /
• pp.484-492
• /
• 2005

Purpose: This study was undertaken to identify the effect of providing information on anxiety, knowledge and compliance in permanent pacemaker patients. Method: A quasi experimental design with non-equivalent control group and non-synchronized design was used. The subjects of this study were 50 patients who had received permanent pacemaker implantation at a university hospital in Seoul. They were divided into an experimental group of 22 patients who received education and a control group of 28 patients. The education was composed of group education(twice) and individualized reinforcement education(once) using an education booklet. Results: Anxiety decreased in the experimental group. Knowledge significantly increased in the experimental group compared to that in the control group. Compliance significantly increased in the experimental group. Conclusion: It can be concluded that providing information is effective for reducing anxiety, increasing knowledge and improving compliance of the permanent pacemaker patients.

• The KIPS Transactions:PartD
• /
• v.9D no.1
• /
• pp.135-144
• /
• 2002

Multimedia systems design generally requires a collaborative effort from a group of designers with a variety of backgrounds and tasks, such as content experts, instructional designers, media specialists, users, and so forth. The fact that the designers have totally different backgrounds and tasks may hinder their collaboration. This research develops a collaborative design tool for multimedia systems design, called the Designer's Cafe, with which multimedia designers can share their design knowledge on the Web freely. Designer's Cafe consists of three intelligent agents that are designed for supporting collaboration activities of multimedia designers. The intelligent agents are implemented by using JAVA SCRIPT and COLD FUSION. By using the tool, designers create, revise, and share their knowledge/ideas in very structured ways. The structured design process might enhance the collaboration activities of designers while designing a multimedia system within a virtual working space.

• Proceedings of the Korean Information Science Society Conference
• /
• 2007.06b
• /
• pp.243-248
• /
• 2007

본 연구에서는 관리의 복잡도를 줄이기 위한 대상으로써 운영체제 커널을 목표로 하였다. 특히, 운영체제의 핵심 기능들이 구현된 소프트웨어인 운영체제 커널이 본 논문에서 다루고자 하는 영역이다. 본 연구에서는 커널의 실제적인 서비스를 제공하는 커널서브시스템의 독립성을 살리고 시스템 내부의 변화에 따른 관리 복잡도를 줄이기 위해, 커널 내 구성요소들 간의 상호 관계 조율에 필요한 개념과 그 구조를 제안하고 있다. 본 논문에서 정의한 Self-prevention은 커널 내의 자율적인 상호 관계 조율을 위한 모든 방안들의 총칭이다. 이러한 self-prevention의 구현을 위해 커널 내의 핵심 관리부의 관여를 줄이고 예상치 못한 동작에 대한 처리를 서브시스템의 자율에 맡길 수 있도록 하기 위해서 3가지의 부가적인 커널 컴포넌트들 (sampler, analyzer, preventer)을 정의하였고, 그 상호관계들을 서술하고 있다. 본 연구의 기여도는 크게 두 가지로써 먼저, self-managing 혹은 자율형 컴퓨팅 분야의 새로운 시도라는 점과 두 번째로 서브시스템의 자율성과 독립성을 유지하여 운영체제의 기능 확장성에 도움이 될 수 있다는 것이다.

• Clinical and Experimental Pediatrics
• /
• v.46 no.1
• /
• pp.51-55
• /
• 2003

Purpose : We intended to find out the role of transesophageal atrial pacing in evaluation of infants and children with palpitation of unknown origin. Methods : We tried transesophageal atrial pacing study in 69 infants and children with palpitation, in whom tachycardia wasn't documented in electrocardiogram and reviewed retrospectively the records of transesophageal pacing and medical records of theses patients to find out the induction rate of tachycardia by transesophageal atrial pacing and the possible mechanism of tachycardia if induced. Results : In 70.1% infants and children with palpitation, tachycardia was induced, so we could conclude that tachycaridia was the cause of palpitation in these cases. In most cases, tachycardia was induced by rapid atrial pacing, and in 21% by using isoproterenol. Tachycardia induction rate was higher in <6-year-old children than ${\geq}6$-year-old children(P<0.05). In cases of the induced, we reviewed the mechanism of tachycardia. Of these induced tachycardias, 53.2% is atrioventricular reentry tachycardia, 34.0% were atrioventricular nodal reentry tachycardia, and 12.8% were idiopathic left ventricular tachycardia. Invasive electrophysiologic study was done to 10 patients of those induced. The results of electrophysiologic study and transesophageal pacing and recording were the same except for one patient. Conclusion : Transesophageal atrial pacing and recording is a less invasive, safe and useful method to find out the cause of palpitation and the mechanism of tachycardia in infants and children.

• Journal of Music and Human Behavior
• /
• v.18 no.2
• /
• pp.19-43
• /
• 2021

The purpose of this case study was to examine whether an interactive music-making intervention using GarageBand was applicable to improve the social communication skills of school-age children with autism spectrum disorder (ASD). Two children with ASD (both male, ages = 8 and 11 yrs.) participated in this study. The interactive music-making intervention included three stages: 1) musical imitation, 2) musical expression and coordination, and 3) musical interaction. Each session lasted 40 minutes, and sessions took place twice a week over 4 weeks. The participants' social communication behaviors were observed and analyzed in terms of exchanging ideas with each other. Engagement in interactive behaviors (e.g., turn-taking, imitating or reflecting the investigator's music, and creating one's own music using the motive from the investigator) during music making was also analyzed. During the sessions, increases in the attempts to express their opinions on music making processes and requests for help for the process were observed. Engagement in turn-taking form of interactive playing and reflecting the musical motive from a partner (i.e., investigator) were also improved. The Social Responsiveness Scale-2 (SRS-2) ratings indicated negative social behaviors decreased after intervention in both participants. The findings of this study suggest that interactive music-making activities using GarageBand can be an effective method in clinical practice to improve social communication skills for school-aged children with ASD.

• Journal of Music and Human Behavior
• /
• v.19 no.2
• /
• pp.27-53
• /
• 2022

The purpose of this case study was to construct a social context-based musical play program for children with high-functioning Autism Spectrum disorder (ASD) and to examine its applicability in improving the social skills of the children. The participants were a group of three children with high-functioning ASD with an average age of 9 years. The children participated as a group in 40-minute sessions that were implemented twice a week for 8 weeks. The children's social communication behaviors were observed during the sessions and analyzed in terms of sharing and exchanging their ideas and voluntarily interacting with peers and an adult (i.e., the researcher). The Social Skills Rating System (SSRS) was completed by the teachers of participants before and after the intervention. For all three participants, the occurrence of behaviors to exchange their ideas with peers and voluntarily interacting with an adult increased following the intervention. However, there were individual differences between the participants in terms of changes in each target behavior depending on their level of language and social skill development. These results suggest that social context-based musical play program may produce positive changes in voluntary communication with peers and play a significant role in expanding the scope of interventions that target the social communication of children with ASD.