• Research in Mathematical Education
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• v.16 no.2
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• pp.107-123
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• 2012

A group of twenty-nine high school student-teachers were given a set of mathematical propositions focusing on shape-to-shape transformations. Their task was to determine through hands-on manipulation and use of dynamic software that each shape be transformed into an area equivalent rectangular region. This paper reports on a classroom-based research.

• Proceedings of the Korea Concrete Institute Conference
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• 2002.10a
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• pp.587-592
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• 2002

This study attempts to calculate tile nominal flexural strength of reinforced concrete beam with carbon fiber sheets by tile 27 cases which have three steel ratios and four reinforcing ratios. Based on the result, application possibilities of strength design method to estimate the nominal moment is investigated and valuable data of carbon fiber sheets for reinforcing design will be discussed.

• Proceedings of the Korea Concrete Institute Conference
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• 2002.10a
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• pp.329-334
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• 2002

In recent years building floors become larger and more spacious due to the development of new design methods and high strength and light weight materials, However, such long span floor systems may provide smaller amount of damping and have longer period so that they would be more vulnerable to the floor vibration. This study attempts to evaluate the performance of the floors in typical apartment buildings. Three different floors with the area of $43.2m^2 41.44m^2 and 34.5m^2$, were investigated. The guideline provided by AISC(1997) is used to check the acceptability of the floor vibration.

• Journal of the Ergonomics Society of Korea
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• v.12 no.2
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• pp.29-43
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• 1993

This paper presents a conceptual approach to convert customer requirements expressed in ordinary language into a form of qualitative and quantitative functions for developing new products. This approach attempts to combine the concepts of the value engineering and the Kansei engineering. It emphasizes that customer require- ments should be interpreted and reflected on the design of new product. Specific are discussed for extracting subjective requirements and transforming them into qualitative and quantitative functions for product design. This approach is expected to provide the product designer with a systematic efficient tool for incorporating subjective requirements into a product design.

• Journal of the Korean Mathematical Society
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• v.35 no.3
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• pp.503-525
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• 1998

In the theory of retrial queues it is usually assumed that the flow of primary customers is Poisson. This means that the number of independent sources, or potential customers, is infinite and each of them generates primary arrivals very seldom. We consider now retrial queueing systems with a homogeneous population, that is, we assume that a finite number K of identical sources generates the so called quasi-random input. We present a survey of the main results and mathematical tools for finite source retrial queues, concentrating on M/G/1//K and M/M/c//K systems with repeated attempts.

• IE interfaces
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• v.13 no.1
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• pp.44-53
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• 2000

While knowledge management (KM) needs to be introduced in order to enhance the competitiveness of Korean firms, most of the current literature focuses on defining the concept of KM and developing its framework. This research attempts to develop an introduction methodology of KM, based on four dimensions such as organization, information technology, process, and culture. The methodology was applied to firm L, which recently adopted KM. A result from the analysis of this case study shows that firm L performed well in the dimensions of organization, information technology, and culture.

• Proceedings of the KIEE Conference
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• 2004.11c
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• pp.240-242
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• 2004

A channel allocation algorithm of multi-user OFDM(orthogonal frequency division multiplexing) system is presented. The proposed algorithm is to reduce the complexity of the system, using the GNN(gradual neural network) with gradual expansion scheme and the algorithm attempts to allocate channel with good channel gain to each user. The method has lower computational complexity and less iteration than other algorithms.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.35 no.12
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• pp.579-585
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• 1986

A Reversed Field Pinch(RFP) Plasma automatically forms the reversed field configuration in a stable state by the self-reversal phenomenon. But this process of formation of the reversed field configuration has a problem that instabilities occur. In order to form a RFP configuration in a stable state by removing instabilities, this experimental study attempts to restrain Toroidal magnetic fields and supplement Toroidal flux by employing high frequency rotating fields. As a result, the reversed magnetic field configuration is stably formed in a short period because high frequency rotating fields can deflect poloidal currents and produce magnetic fields in the Toroidal direction.

• Journal of Environmental Science International
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• v.9 no.6
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• pp.523-529
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• 2000

Attempts have been made to use Supercritical fluids for industrial purpose in a variety of fields and some of them, are already in practice. However, basic chemical properties of supercritical fluids have not been understood well. The present pater presents the results of physicochemical studies on Supercritical fluids as well as the application of supercritical fluids to industry. The detail is as follows PCB and organic compounds.

• 제어로봇시스템학회:학술대회논문집
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• 1993.10b
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• pp.541-544
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• 1993

This paper attempts to propose new procedures to evaluate roughness of ground metallic surface in the range of 1-10.mu.m from data gained by an optical, in-process measurement of the surfaces. Studies are made to process the data of reflected lights pointed at the surface to be measured. Results obtained are compared with those of measurement by stylus roughness meter. Correlations between the two types of roughness measurement are well. The proposed method can be used as a sensor for a polishing robot.