• Journal of Science Education
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• v.36 no.2
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• pp.235-250
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• 2012

This paper aims to find out whether or not elementary school students recognize and understand scientific units that they encounter in their everyday life. To select appropriate units for the survey, first, scientific units in elementary textbooks of science and other science related subjects were analyzed. Then it was examined how these units were related to the learners' daily life. The participants in the current survey were 320 elementary school 6th graders. A questionnaire consisted of 11 units of science, such as kg for mass, km for distance, L for volume, V for voltage, s for time, $^{\circ}C$ for temperature, km/h for speed, kcal for heat, % for percentage, W for electric power, pH for acidity, which can often be seen and used in daily life. The students were asked to do the following four tasks, (1) to see presented pictures and select appropriate scientific units, (2) to write reasons for choosing the units, (3) to answer what the units are used for, and (4) to check where to find the units. The data were analyzed in terms of the percentage of the students who seemed to well recognize and understand the units, using SPSS 17.0 statistical program. The results are as follows: Regarding the general use of the units, it was revealed that almost the same units were repeated in science and other subject textbooks from the same grade. With an increase of the students' grade more difficult units were used. As for the use of each unit, it was found that they seemed to relatively well understand what these units kg, km, L, $^{\circ}C$, kcal, km/h, and W stand for, showing more than 91% right. However, the units of V, s, in particular, %, and pH did not seem to be understood. With respect to the recognition of the units, most students did not recognize such units as L for volume and pH for acidity, probably because the units are difficult at the elementary level in comparison to other scientific units. The students indicated that schools were the best place where they could learn and find scientific units related to life, followed by shops/marts, newspapers/broadcasting, streets/roads, homes, and others in that order. The results show that scientific unit learning should be conducted in a systematic way at school and that teachers can play a major role in improving students' understanding and use of the units.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.28 no.5D
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• pp.723-734
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• 2008

In this paper, the problems and betterment plan in operating district units plan are studied by selecting typal case locations based on the types of district units plan of the city of Busan. According to the types, 4 locations of 'type of maintaining preexisting district' and 3 of 'type of managing preexisting district' are selected as case locations, based on a scale and characteristics of each location.In systematical aspects of the case locations, indiscreet upward adjustment of the locations, insignificant participation of the citizens and patternization were recognized as problems. And setting accurate standards for target and range of alteration in line with usage plan of the locations would be necessarily urgent. So through the analysing process of the problems arisen from the case locations I would suggests necessary solutions to improve the effectiveness of the district units plan. And In planning aspects, the similarity between the basic directions and the object, batch-application of the density plan, inadequacy of the usage plan, allocations and patterns of structures, and color planning were recognized to have problematic points. Consequently distinguished specific operating-guidelines would be necessary to achieve the basic directions and the object of district units plan. Furthermore, the building-to-land ratio and floor space index are needed to be exactly calculated through providing accurate and logical standards for appropriate development density of structures.

• Journal of the Korean Association of Geographic Information Studies
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• v.19 no.4
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• pp.157-168
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• 2016

Change of Zoning Regulations in district unit plans calls for improving development benefits through upzoning rather than harmonious worldwide development. The purpose of this study is to examine the floor area ratio incentive system according to un-zoning in district units plan, and to suggest criteria to secure publicness. In order to derive methods to secure district unit plan publicness in Busan Metropolitan City, the ratio of securing public facilities through upzoning was examined. A comparative analysis of land price rate in the entire city versus the use district suggests that it is possible to secure 10 to 15% of public facilities. In this study, 10% of the project site was applied to secure public facilities, and it produced upgraded publicness.

• Proceedings of the KIPE Conference
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• 2010.07a
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• pp.220-221
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• 2010

최근 IGBT를 비롯한 IGCT, SCR, MOSFET 등 전력용 반도체의 눈부신 발전으로 인해 전력용 반도체 소자를 이용한 고주파 영역의 스위칭을 요구하는 시스템의 연구가 활발하게 이루어지고 있다. 따라서 본 논문에서는 단위역률을 이룰 수 있는 전류형 인버터를 이용한 유도가열 시스템에 대해 연구하였으며 제안된 방식의 타당성을 위해 시뮬레이션 및 실험을 행하였다.

• Journal of the KSME
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• v.33 no.6
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• pp.499-514
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• 1993

이 MEMS연구는 상당히 넓은 분야를 포함하나, 그 핵심은 바로 마이크로가공 기 술(micromachining technology)에 있다. (막연히 작은 것이 아닌 마이크로미터 단위의 가공이라는 점을 살리기 위해, "마이크로" 가공이라 부르겠다.) 이 글에서는 우선 MEMS란 무엇인가에 대해 언급한 후, MEMS에 있어서의 마이크로가공(micromachining)이 어떤 것인지를 소개, 설명함에 주력한다. 마이크로가공 기본개념의 전달에 있어서는, 처음 대하는 이들의 이해를 돕기위해 되 도록 인용을 줄이고 핵심개념만 담아 최대한 단순화시켜 설명하였다. 이러한 핵심 개념을 바탕 으로하여 설명되는, 뒤 따르는 실제 예로는 기계공학적으로 관련이 있어 보이는 몇 가지를 인 용하였다.지를 인 용하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2007.06b
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• pp.148-151
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• 2007

소프트웨어가 해결해야 할 문제가 점점 복잡해지고 있음과 동시에 소프트웨어의 자체의 복잡도 또한 증가하고 있다. 또한 소프트웨어 개발 시간에 예상하지 못했던 실행 환경에 노출되는 경우가 빈번해 졌다. 이러한 요구상항과 함께 소프트웨어의 유지보수와 개발을 쉽게 하기 위해 자가 적응형 소프트웨어에 대한 필요가 늘어나고 있다. 자가 적응형 소프트웨어란 실행 환경과 내부 상황을 판단하여 적절한 기능을 수행할 수 있도록 스스로 재구성 할 수 있는 소프트웨어이다. 소프트웨어가 향상된 기능으로 재구성을 하려면 자신의 내부 상황과 자원 소모량 등 소프트웨어 실행 환경에 대한 계속 적인 관찰이 필요하다. 그러나 기존의 자원 소모량 관찰에 대한 연구는 개발 시간에 프로그램 자체 효율을 위해 프로그램 개발 언어 단위에서 이루어져왔다. 예를 들면 관찰 단위가 실행시 호출되는 함수나 데이터 중심으로 진행 되어 재구성 단위인 컴포넌트 별로 이해하기가 쉽지 않았다. 따라서 본 논문은 재구성 단위를 컴포넌트로 정의 하고 메소드 단위의 호출이 생길 때마다 발생하는 데이터를 컴포넌트 단위로 추상화 시키는 기법을 제안한다.

• Journal of the Economic Geographical Society of Korea
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• v.13 no.4
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• pp.515-528
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• 2010

This study analyzes the impacts of mixed-use development and transportation on housing values in Seoul, Korea. An index measuring the land use mix is proposed using three components of land uses, residence, office, and retail, which are the essential elements for everyday urban life. This index offers a relatively easy way in measuring the level of mixed-use and proves itself useful providing sensible and reliable results in this empirical study. Also surface and underground transportation accessibilities are measured. By covering both surface and underground, a comprehensive view of Seoul's transportation accessibility is provided. Finally, housing value models are constructed with developed variables, i.e. land use mix index and accessibility measures, as well as relevant socio-economic variables. The empirical outcomes verifies that mixed-use development and transportation accessibility positively affect housing values.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2019.06a
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• pp.240-242
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• 2019

본 논문에서는 대한민국 국토에 대한 토지피복지도를 인공위성 영상으로부터 생성하는 기술을 제안한다. 제안하는 방법은 먼저 합성곱 신경망을 이용하여 인공위성 영상의 각 패치를 4 종류의 토지 용도로 분류한다. 이후 인공위성 영상과 토지 용도 분류 결과를 조건부 랜덤 필드에 적용하여 픽셀 단위로 색상과 질감이 유사한 영역을 같은 토지 용도로 분류될 수 있도록 하여 정확한 토지피복지도를 생성한다. 현재 대한민국 국토에 대한 토지피복지도 생성을 위해 구축된 데이터 세트가 없기 때문에 본 연구에서는 합성곱 신경망 학습을 위한 데이터 세트를 직접 구축하였다. 이를 위해 환경공간정보 서비스 웹사이트로부터 인공위성 영상을 취득하고, 각 영상을 패치 단위로 나누어 토지 용도를 직접 분류하였다. 실험 결과를 통해 제안하는 토지 용도 분류 합성곱 신경망의 성능을 평가하였으며, 최종 생성된 토지피복지도는 제안하는 방법이 효과적으로 토지 용도를 분류할 수 있음을 나타낸다.

• School Mathematics
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• v.6 no.1
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• pp.91-118
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• 2004

Since 1998 year, many educational software and its contents have been developed by individuals and public institutes. However, it is not easy to re-use the contents effectively and consistently, because they should be changed and reorganized whenever a curriculum is changed. Therefore, it is important for each subject to establish new system in which the contents or their teaching-learning elements are not changed although new curriculum appears. In this respect, in last year(2003 year), while setting mathematics as a representative subject, KERIS executed a study on developing a system(or method) of classifying teaching-learning materials in mathematics using computers, based on future-oriented curriculum including the current mathematics curriculum. Finally, for this study, the most essential and basic teaching-teaming 'units' were developed and the total number of units were 339. Also, in addition to the development of 'units', the 'elements' were developed for understanding more concrete contents included in each 'unit' and the total number of elements were 1191.

• Spatial Information Research
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• v.22 no.3
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• pp.35-46
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• 2014

Population data are usually provided at administrative spatial units in Korea, so areal interpolation is needed for fine-grained analysis. This study aims to compare various methods of areal interpolation for population subgroups rather than the total population. We estimated the number of elderly people and single-person households for small areal units from Dong data by the different interpolation methods using 2010 census data of Seoul, and compared the estimates to actual values. As a result, the performance of areal interpolation methods varied between the total population and subgroup populations as well as between different population subgroups. It turned out that the method using GWR (geographically weighted regression) and building type data outperformed other methods for the total population and households. However, the OLS regression method using building type data performed better for the elderly population, and the OLS regression method based on land use data was the most effective for single-person households. Based on these results, spatial distribution of the single elderly was represented at small areal units, and we believe that this approach can contribute to effective implementation of urban policies.