• Journal of Educational Research in Mathematics
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• v.8 no.1
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• pp.365-380
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• 1998

Structualist view distinguishes structure(reality) from phenomenon(appearance). Phenomenon is the outside aspect of structure and structure is the inside aspect of phenomenon. From the structualist view, the knowledge could e divided into two parts, the appearance of knowledge(the outside aspect of knowledge)and the structure of knowledge(the inside aspect of knowledge). Structualist view advices teachers to understand knowledge more totally from the inside-outside viewpoint, and not to teach mere the one aspect of knowledge, especially the outside aspect of knowledge, that is, the written expressions in textbook, but to teach the inside and outside aspects fo knowledge totally. In the history of mathematics education, the attempts to teach the structure of knowledge were flourishing in the period of discipline-centered curriculum. 'New Math movement' represents the attempts. The advocators of New Math, however, did not succeed sufficiently to understand the inside-outside view which the term the structure of knowledge represents, and failed to make mathematics teachers to understand the view well. Their attention was put on to introduce the modern mathematics to school math rather than to understand the educational and epistemological perspective which the term the structure of knowledge represents. To teach the structure of knowledge, mathematics teacher should be able to understand mathematical knowledge more totally from the inside-outside viewpoint. Especially, s/he should not regard the outside aspect of mathematical knowledge written in textbook as the totality of knowledge, but inquire into the inside aspect of mathematical knowledge from the outside aspect of mathematical knowledge.

• Journal of the Korean Society of Visualization
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• v.5 no.2
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• pp.48-55
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• 2007

Flow structure inside a refrigerating compartment of a scale-down display cooler model was investigated experimentally by using PIV (particle image velocimetry) method, a reliable velocity field measurement technique, in the present study. In addition, we also carried out flow visualization regarding flow structure and particle movement inside a display cooler by using a tracer method. As a result, the mean velocity field measurement shows a large scale vortical flow structure inside a refrigerating compartment due to strong entrainment flow, going through a base plate open gaps.

• Journal of the Korean Society for Railway
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• v.11 no.6
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• pp.519-523
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• 2008

Inside noise levels of running train is the summation of air borne noise and structure-borne noise. In this paper, structure-borne noise, which is known to dominate inside noise level in open field, is investigated. Structure borne noise is analyzed in terms of vibration sources, transmission path and noise generating part so as to reduce inside noise levels.

• Proceedings of the KSR Conference
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• 2008.11b
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• pp.1794-1798
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• 2008

Inside noise level of a running train in open field is the summation of air borne noise and structure-borne noise. Anti-roll bar is the major transmission path of vibration from bogie. And this vibration gives an effect to the structure borne noise. In this paper, the effect of anti-roll bar is investigated. Structure borne noise is analyzed in terms of changing the mounting position of anti-roll bar to reduce inside noise levels.

• Korean Journal of Social Welfare Studies
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• v.41 no.1
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• pp.85-118
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• 2010

This study aims to suggest an analysis method for the research on the transformation of welfare states. To this end, 'restucturization' and 'change inside the structure' were differentiated. The 'restucturization' indicates a fundamental change of the structure itself, while the 'change inside the structure' means the modification of elements inside the structure. If 'abolition', 'substitution'/'entrust' and 'introduction' occurred, the changes are considered the 'restucturization'. Then it is examined, how the competence of the public organizations for social security systems is changed after the 'restucturization'. On the basis of this evaluation measure, the changes of 'restucturization' are defined as 'public-oriented restucturization', 'private-oriented restucturization' or 'status quo'. For analyzing the 'change inside the structure', coverage, entitlement, the level and length of benefit, finance and delivery system were compared within each country. The current study applied this analysis method to the research on the transformations of social security systems of Great Britain, Sweden and Germany.

• Journal of the Korea Safety Management & Science
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• v.17 no.2
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• pp.235-240
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• 2015

Using a progressive die of the multi-stage drawing product, It was experiments for the Influence of the Products Roundness on the die pad process Safety die model, obstacle countermeasure research safety die design When the die pad is independent structure, Sidewall thickness of the inside 2stage, 3stage, 4stage of the product is thicker, the thickness of the inside 1stage and the bottom is thinner. it was become unstable beacuse the inside 1stage related to the Products Roundness is thinner. When the die pad is Integrated structure, Sidewall thickness of the inside 1stage, 2stage of the product is thicker, and Sidewall 3stage and 4stage was a thin. it was become unstable beacuse the inside 3stage related to the Products Roundness is thinner. Therefore, The appropriate combination of and integrated independent is required for each process.

• Science of Emotion and Sensibility
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• v.16 no.1
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• pp.125-132
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• 2013

Recently, the consciousness of energy crisis is rapidly growing and sustainable eco-friendly energy sources are becoming issue. Therefore the portable electronic device requires new energy sources for providing continuous power supply and the power energy harvesting system of the human body that enables the power-harvesting research requests anytime, anywhere. One of the sources for energy harvesting is heat energy, which is the difference in temperature of the body and the surrounding environment. We tried to analyze the temperature difference between the environmental temperature and the temperature inside clothing according to the structure of the closed portion. And we examined the temperature difference between the environmental temperature and the temperature inside clothing according to the material of the clothing. The analysis showed that we have been able to get different results at parts of the body in the temperature inside clothing according to the structure of clothing. In upper torso of the chest and back, the temperature inside clothing of 'closed structure' was higher than the temperature inside clothing of 'opened structure'. In the section of arm and leg, it was reduced the difference of temperature inside clothing between 'closed structure' and 'opened structure'. It was particularly noticeable in the section of leg. The results of analysis of the difference between the environmental temperature and the temperature inside clothing according to the material of the clothing, in both cases of the two materials, 'closed structure' was higher than the 'opened structure' in the difference value between the environmental temperature and the temperature inside clothing. There was a difference according to the material in the section of leg. In this study, we outlined the basic guidelines for developing heat energy harvesting clothing by exploring the structure and material of clothing suitable for the heat energy harvesting.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2006.05a
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• pp.1449-1452
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• 2006

When fluid at high speed flows over an open cavity, large acoustic pressure fields inside the cavity are produced by fluid/structure interactions at the downstream end of the cavity. The inter-coach spacing is one of the most important sources of the aero-acoustic noise of a high-speed train. This noise can usually be heard as low frequency structure-borne noise inside the train. In this study experiments were performed in order to investigate the effects of mud-flap length on the aeroacoustic noise generation inside high-speed trains. Results of the measurement confirmed that the characteristics of the noise generated from the inter-coach spacing are strongly dependent on the size of the gap. Also investigated are the characteristics of the turbulent flow after the inter-coach spacing and consequent generation of the aeroacoustic noise inside the cabin.

• Journal of Mechanical Science and Technology
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• v.19 no.3
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• pp.894-904
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• 2005

The flow structure inside the intake head greatly affects the working efficiency of a vacuum cleaner such as suction power and aero-acoustic noise. In this study, the flow inside intake heads of a vacuum cleaner was investigated using qualitative flow visualization and quantitative PIV (Particle Image Velocimetry) techniques. The aerodynamic power, suction efficiency and noise level of the intake heads were also measured. In order to improve the performance of the vacuum cleaner, inner structure of the flow paths of the intake head, such as trench height and shape of connection chamber were modified. The flow structures of modified intake heads were compared with that of the original intake head. The aero-acoustic noise caused by flow separation was reduced and the suction efficiency was also changed due to flow path modification of intake head. In this paper, the variations of flow fields for different intake heads are presented and discussed together with results of aerodynamic power, suction efficiency and noise level.

• Proceedings of the SAREK Conference
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• 2006.06a
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• pp.1131-1136
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• 2006

In this study, an experimental and numerical analysis on the flow characteristics of heating and cooling unit installed within ceiling with functional modules was carried out. And the flow characteristics of the heating and cooling unit was investigated with the main parameters such as each filter and inside structure. The experimental results show the possibility of medium filter application. And the numerical results show that the effect of improved inside structure of heating-cooling and air-conditioning unit on flow distribution.