• Proceedings of the IEEK Conference
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• 2000.07b
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• pp.1100-1102
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• 2000

Most systems in tile real world are non-linear and can be represented by the non-linear autoregressive moving average (NARMA) model. The extension of fuzzy system for modeling the system that is represented by NARMA model will be proposed in this paper. Here, fuzzy basis function (FBF) is used as fuzzy NARMA(p,q) model. Then, an approach to Identify fuzzy NARMA models based on fuzzy basis functions is proposed. The efficacy of the proposed approach is shown from experimental results.

• Proceedings of the Korea Association of Information Systems Conference
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• 1998.10a
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• pp.165-177
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• 1998

The purpose of this study, based on domestic sample businesses using EDI systems, is to identify success factors, which affect adoption of EDI systems by domestic business entities. And this paper also intends to provide guideline important in the establishment and management of EDI systems based factors identified. The major contents of this research are as follow. This paper, first, tries to develop conceptual framework based on previous research to identify factors which affect successful adoption of EDI systems. Second, it intends to develop new version of survey questionnaire by referring to various survey questionnaires previously used by similar studies. Third, it also intends to the extent of each factor on the successful adoption and implementation of EDI systems, and examines proposed hypotheses.

• Journal of international Conference on Electrical Machines and Systems
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• v.1 no.1
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• pp.84-90
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• 2012

Various methods have been proposed to identify the flux position in an interior permanent magnet synchronous motor (IPMSM) without the use of mechanical sensors. To achieve this, a method that uses both the back electromotive force (EMF) and the saliency to identify the flux position in the IPMSM without the injection of high-frequency components at low speeds has been reported. This method was then extended in order to drive the motor with no load to a light load. We propose a combination of these methods with different proportional-integral (PI) controllers for controlling $di_{dest}$/dt and $di_{qest}$/dt. We also introduce compensation values $F_L$ and $F_H$ to reduce the position error when the estimation rule is being selected.

• The Bulletin of The Korean Astronomical Society
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• v.37 no.2
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• pp.83.1-83.1
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• 2012

The galaxy cluster is a good laboratory to test the cosmological model as well as the evolution of galaxies in the dense region. However the lack of wide and deep near-IR datasets has prevented to identify galaxy clusters at z>1. Here we merge a wide, deep near-IR datasets of UKIDSS DXS (J and K bands) and IMS (J band) with the CFHT Legacy Survey (CFHTLS) ugriz catalogue to detect galaxy clusters. We identify candidate galaxy clusters at z>0.8, where the near-IR dataset plays an important role to detect galaxies efficiently. The cluster mass is also estimated based on the cluster richness and the semi-analytical cosmological simulation.

• Structural Engineering and Mechanics
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• v.8 no.3
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• pp.285-297
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• 1999

A method is presented to find the location and magnitude of damage in a structure using data from dynamic tests. The test data include a combination of natural frequency measurements, taken before and after the occurrence of damage, and response measurements taken after damage. An algorithm is developed to identify localized increases in the flexibility of the structural members. Increases in flexibility are attributed to damage. The algorithm uses the sensitivity of the flexibility matrix to changes in the natural frequencies of the structure to identify the damage. A set of under determined equations is solved using an objective function which is derived from measurements of the system moments. Damage ranging from 10 to 60% increase in the flexibility of a member was successfully identified in a 50 d.o.f. structure, using a small number of natural frequency and velocity measurements.

• The Mathematical Education
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• v.42 no.3
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• pp.403-417
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• 2003

The purpose of this study is to analyze the effects of the use of calculators in elementary school mathematics education. For this purpose, we established the subject matters of the research as folloows; (1) to develop the lesson plan and the students' activity sheet related to the use of calculators. (2) to analyze the effects of the use of calculators when we applied the materials developed. Four classes of sixth grade students were sampled two elementary schools in D city. Two of them were assigned to the calculator group and the others to traditional group. The experiment was conducted for 10 class times. Two kinds of test instruments were used: pretest and post test. The pretest scores guaranteed that both groups were homogeneous. Post-test was used to identify the effect of use of calculator and the post-test scores were analyzed by t-test. We also used questionnaire to identify the students' change of attitude toward mathematics. The results of this study as fellows: (1) The calculator group got scores significantly higher than the traditional group on the test. (2) The students' attitude in calculator group was changed a little positively.

• Journal of Families and Better Life
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• v.16 no.1
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• pp.27-38
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• 1998

The purpose of this study was to identify the level of residential privacy perceived by the elderly and also to identify contributing factors on their perception of privacy. This study examined the relations among socio-demographic characteristics housing characteristics and personal perception of privacy. The number of 469 elderly aged 55 and over were interviewed in Seoul. Daejeon Jeonju and Daegu, The data were analyzed by statistical methods such as frequencies means and multiple liner regression analysis. The result showed that the significant variables related to the perception of residential privacy of the elderly were the personal self-esteem age housing tenure pattern of using spaces family solidarity and availability of the perception of private space. The perception of the privacy of the elderly can be affected by personal characteristics and the privacy can be achieved by improving their present housing environment.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.39 no.3
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• pp.223-231
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• 1990

Optimal Power Flow (OPF) solution by the Newton's method provides a reliable and robust method to classical OPF problems. The major challenge in algorithm development is to identify the binding inequalities efficiently. This paper proposes a simple strategy to identify the binding set. From the mechanism of penalty shifting with soft penalty in trial iteration, an active binding set is identidied automatically. This paper also suggests a technique to solve the linear system whose coefficients are presented in the matrix from. This implementation is highly efficient for sparsity programming. Case studies for 3, 5, 14, 118 bus and practical TPC-190, KEPCO-306 bus systems are performed as well.

• Journal of the Korean Home Economics Association
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• v.36 no.3
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• pp.161-172
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• 1998

The purpose of this study were 1) to identify the effect of regions on clothing brand loyalty and related variables, 2) to investigate the relationships between brand loyalty and clothing importance, aesthetic aspects of clothing, modesty, status symbol of clothing and authoritarian personality, and 3) to identify the effects of age, job, education and income on clothing brand loyalty. The subjects were 106 and 100 female adults living in Kyong-Ju and Seoul, respectively. The data were collected using self-administered questionnaires and were analyzed by t-test, chi-square test, correlation, multiple regression and ANOVA. The results showed that 1) clothing importance and authoritarian personality were different according to regions. That is female living in Kyong-Ju had a higher authoritarian personality and female living in Seoul had a higher clothing importance scores. 2) The status symbol of clothing, aesthetic aspects of clothing, and authoritarian personality were positively related to brand loyalty. Among these, the status symbol of clothing was the most significant variable, 3) Continued brand loyalty and habitual brand loyalty were varied by age.

• The Journal of Information Technology and Database
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• v.5 no.1
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• pp.51-67
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• 1998

There exist a number of information systems planning(ISP) methodologies. As the level of market competition gets intensified, firms are more likely to engage in organizational transformations such as BPR and CPI(continuous process improvement). Because this new requirement should be incorporated into ISP methodology, the number of ISP methodologies available will be continually increasing. However, we could not find a framework for understanding and classifying these divergent methodologies. So, we here present a framework for classifying ISP methodology classes. With this framework, we categorize different classes of ISP methodologies and identify their limitations in terms of missing elements and links. And we move on to present new technical innovations and other methodological advances that, if properly integrated with ISP methodologies, would help us derive an IT infrastructure plan more effectively. Furthermore, in search of software tools or aids supporting the application of ISP methodologies, we identify requirements of ISP-supporting software tools and evaluate functions of existing software tools, then suggesting a future direction to that end.