• 대한수학회논문집
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• 제33권3호
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• pp.823-831
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• 2018

We define progressive tax rate functions, study their properties, and describe some smooth models. The key requirement, defining the progressive nature of the taxation model, is that the progressive tax rate functions should have infinite contact with the zero function at the origin, in order to care the poor. In constructing a wide array of such functions, assisting functions are introduced.

• 한국의류학회지
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• 제19권3호
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• pp.471-482
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• 1995

Using the acetate velvet and viscose velvet whose pile lengths were sheared as 1.45, 1.55, 1 65, 1.75, 1.85, 1.90mm under the condition equating the weaving process of ground fabric, the conclusions were as follows through the results of the sensory assessments estimated by women students in our university and the physical properties, H. V and T. H. V obtained by KES-F system. 1. In the sensory assessments estimated by the method of paired comparison and ranking of samples, the longer pile length was, the more the hand values of smoothness, softness, thickness, heaviness increased on the whole. 2. The H V. and T. H. V. measured by KES-F system were as follows; Kohi increased to pile length 1.85mm and then decreased a little at 1.90mm. hummer increased as pile length was longer. Fukurami increased to pile length 1.75mm and then decreased gradually as pile length was longer. Total hand value increased gradually from 1. 45mm to 1.85mm, had the top value at 1.85mm, and then decreased a little at 1.90mm. 3. In the results of summarizing $\ulcorner$the physical properties correlated closely with the H. V obtained by sensory assessments$\lrcorner$ and tithe Physical properties correlated closely with the H. V. and T. H. V obtained by KES-F systems, it showed that all the sensory properties correlated closely with compressive energy, flexural rigidity, thickness, weight and pile ratio in the former and that the physical properties correlated closely with each H V and T. H. V were different in the latter. 4. It showed that factor 1 was related to compressive energy, thickness, weight, pile ratio, factor 2 was related to recovery energy, compressive resilience, compressive index, and factor 3 was related to compressive recovery ratio in the result of factor analysis. 5. In the multiple repression analysis, the expressions of all sensory properties had compressive ratio, frictional coefficient in the regression expressions of $\ulcorner$H. V. obtained by sensory assessments$\lrcorner$, while the expressions of each H. V. and different physical properties in the regression expressions of $\ulcorner$H. V. obtained by KES-F system$\lrcorner$.

• 디지털콘텐츠학회 논문지
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• 제2권1호
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• pp.41-50
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• 2001

21세기를 맞이하고 있는 현대 사회는 빠른 속도로 변화하고 있다.지식화, 정보화로 인해 정보기술(IT) 관련 산업이 전체산업에서 차지하는 비중이 크게 증가하고 이에 따라 우리 사회에 미치는 영향력도 갈수록 증대되고 있다. 따라서 우리는 급변하는 사회에 신속히 적응하기 위해 새로운 기술, 문화 등을 인지하여야 하며 그 중에서도 우리의 실생활과 밀접한_관계를 맺고 있을 뿐만아니라 그 활용도가 높은 지능형 교통시스템(ITS:Intelligent Transport Systems)을 숙지해야 할 필요가 있다. 그러나 비 ITS 전문가들은 신기술인 ITS를 생소하고 난해하게 느껴 쉽게 다가서지 못하고 있는 실정이다. 본 논문에서는 이러한 점을 감안하여 보다 쉽게 일반인들이 이해할 수 있도록 마우스와 키보드의 간단한 조작만으로 ITS 이론을 시뮬레이션을 할 수 있는 ITS 교육용 멀티미디어 Courseware를 소개한다. 개발된 Courseware는 ITS란 무엇인가를 한눈에 알수 있게 하는 개요와 구성요소, 활용도를 높이기 위해 실생활과 접목시킨 사용자 서비스 및 적용분야 등의 여러 분야를 포함하고 있으며, 비 ITS 전문가들을 대상으로 교육현장에 적용시 그들의 이해도를 증진시킬수 있었다.