• 자원환경지질
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• 제33권4호
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• pp.273-282
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• 2000

In order to investigate the extent and degree of arsenic and heavy metal contamination and the bioavailability of toxic elements around the abandoned mine in Korea, an environmental geochemical survey was undertaken in the Daduk mine. After appropriate preparation, tailings, soil, stream sediment, crop plant and fingernail samples were analysed for As, Cd, Cu, Pb and Zn by ICP-AES and ICP-MS. Elevated levels of 8,782 mg/kg As, 8.3 mg/kg Cd, 489 mg/kg Cu, 3,638 mg/kg Pb and 919 mg/kg Zn were found in tailings from the Daduk mine. These significant concentrations can impact on soils and sediments around the tailing ponds. Mean concentrations of As, Cd, Pb, Cu and Zn in soils are significantly higher than those in world average soil, especially for As and Pb. Element concentrations in sediments decrease with distance from the tailing ponds due to a dilution effect by the mixing of uncontaminated sediments. Arsenic and Cd are elevated in rice grains and stalks, and Cu and Zn concentrations in chinese cabbage, sesame and bean leaves are higher than the upper limit values for normal plant. Arsenic concentration in fingernails of farmers are higher than the normal level with a maximum value of 1.5 mg/kg. The post-ingestion bioavailability of toxic heavy metals in some paddy and farmland soils has been also investigated using the SBET (simple bioavailability extract test) method. The method utilises synthetic leaching fluids closelyanalogous to those of the human stomach. The quantities of As, Cd, Cu, Pb and Zn extracted from paddy soils after 1 hour indicated 15.9, 65.4, 46.2, 39.4 and 29.4% bioavailability, respectively and for farmland soils, 12.4, 26.0, 31.2, 29.3 and 19.4% bioavailability, respectively. The results of the SBET indicate that regular ingestion of soils by the local population could pose a potential health threat due to long-term toxic element exposure.

• International Journal of Human Ecology
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• 제9권2호
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• pp.107-116
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• 2008

A new movement in forming community villages for better living standards is becoming popular. In order to sustain a proper community, it is essential to design proper community programs and facilities, which can encourage the proactive participation of residents. In this study, detailed aspects of the Mindlre (Dandelion) community (including formation process and management of the village) are investigated. The Mindlre community is a successful community village in Korea concerned with residents' participation and community activities. The community is located in Sancheong, Gyungsangnamdo province in Korea. The study methods are references, field trips, and interviews with residents. Six areas were surveyed and investigated: the physical environment of the Mindlre community and eco-friendly elements, respondents' background and the motivation to join, residents composition, residents' participation in the formation process of the community, self-management systems and common activities, and residents's life satisfaction. The mindlre Community was founded on Christian religions faith. The primary idea of this village was building a new hope for rural areas without discrimination. The size of the village was expanded with housing for teachers and students who were linked with the Mindlre School (substitution school). When the community was founded, existing shapes of the village were preserved. The village was physically renovated based on the original environment, in addition nature friendly materials and methods were used. The residents were proactively involved in the community through regular meetings, self-regulation, and community worship. Although the survey results should that most residents were highly satisfied with living standards, there seemed to be no clear division between community facilities and private houses. A systematic and detailed space planning technique was required. In addition, various community facilities are required due to the expansion of the community.

• 대한전자공학회논문지
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• 제25권9호
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• pp.1115-1124
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• 1988

A two-dimensional systolic array for fast Fourier transform, which has a regular and recursive VLSI architecture is presented. The array is constructed with identical processing elements (PE) in mesh type, and due to its modularity, it can be expanded to an arbitrary size. A processing element consists of two data routing units, a butterfly arithmetic unit and a simple control unit. The array computes FFT through three procedures` I/O pipelining, data shuffling and butterfly arithmetic. By utilizing parallelism, pipelining and local communication geometry during data movement, the two-dimensional systolic array eliminates global and irregular commutation problems, which have been a limiting factor in VLSI implementation of FFT processor. The systolic array executes a half butterfly arithmetic based on a distributed arithmetic that can carry out multiplication with only adders. Also, the systolic array provides 100% PE activity, i.e., none of the PEs are idle at any time. A chip for half butterfly arithmetic, which consists of two BLC adders and registers, has been fabricated using a 3-um single metal P-well CMOS technology. With the half butterfly arithmetic execution time of about 500 ns which has been obtained b critical path delay simulation, totla FFT execution time for 1024 points is estimated about 16.6 us at clock frequency of 20MHz. A one-PE chip expnsible to anly size of array is being fabricated using a 2-um, double metal, P-well CMOS process. The chip was layouted using standard cell library and macrocell of BLC adder with the aid of auto-routing software. It consists of around 6000 transistors and 68 I/O pads on 3.4x2.8mm\ulcornerarea. A built-i self-testing circuit, BILBO (Built-In Logic Block Observation), was employed at the expense of 3% hardware overhead.

• 디지털융복합연구
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• 제16권1호
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• pp.337-342
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• 2018

금속공예 분야에서 점차 쇠퇴되는 대공작품의 예술적 미적 가치를 연구하기 위해 시작된 본 연구는 디자인 요소인 점, 선, 면, 형을 중심으로 한 조형 표현방법으로 선과 면을 선정하고 이를 금속조형으로 시각화 하였다. 선행연구를 통해 알아본 선과 면의 미적 해석은 생명력 있는 반복적 아름다움으로 정의 되었는데 연구자는 여기에서 더 나아가 반복적이면서도 변화를 느낄 수 있는 조형 작품을 나타내고자 했다. 그 결과 선과 면이 규칙적 반복이 아닌 자연스럽게 점진되는 변화를 통해 어려운 기법이나 고도 기술의 제작 방법 없이도 선과 면의 단순한 변화 속에서 느껴지는 미적 아름다움을 표현할 수 있는 탐구의 대상이 가능함을 알 수 있었다. 또한 쇠퇴해가는 금속조형의 고부가가치 산업으로서의 성장을 예측할 수 있었다. 본 연구를 시작으로 향후 선과 면의 활용이 조형요소로서 매우 다양한 미적표현 방법으로 응용될 수 있는 연구가 계속 되기를 바란다.

• 한국전산구조공학회논문집
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• 제15권4호
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• pp.693-702
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• 2002

본 연구에서는 고속철도 열차와 교량구조물의 상호작용에 의한 동적응답을 보다 정밀하게 분석하기 위해 3차원의 주행차량모형을 적용한 20량편성정밀 열차모형과 경부고속철도의 주교량 형식인 2경간 연속 PSC 박스거더교(2@40m)를 대강으로 3차원의 뼈대요소를 사용한 교량모형을 이용하여 철도교의 동적거동 해석 프로그램을 개발하였으며, 열차의 주행시험 결과와의 비교를 통해 개발된 프로그램의 타당성을 검증하였다. 또한 보다 효율적인 열차모형을 제시하기 위해 다양한 편성모형 및 하중모형의 조합에 따른 분석결과에 의하면 가장 무거운 KTX의 동력차를 대상으로 주행차량모형을 적용하고 나머지 차량들은 주행하중모형을 적용한 혼합모형이 효율적인 것으로 판단되었으며, 경부고속철도와 같이 복선구조의 교량인 경우에는 열차의 교행에 의해 증폭될 수 있는 교량의 동적응답 특성에 대한 체계적인 검토가 필요한 것으로 나타났다

• 한국초등과학교육학회지:초등과학교육
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• 제39권3호
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• pp.338-352
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• 2020

This study analyzed and compared the characteristics in plan and practice of elementary school teachers' science-gifted classes and invention-gifted classes based on pedagogical content knowledge (PCK). To do this, we selected eight elementary school teachers with experience in conducting elementary science-gifted classes and/or invention-gifted classes were selected at the gifted education institutes in Seoul and conducted individual in-depth interviews. The analysis of the results reveal that the teachers tended to organize the science-gifted classes with a focus on the exploration of causes and application activities for scientific phenomena, but tended to organize the invention-gifted classes with a focus on producing creative output based on methodology. They were all emphasizing the enhancement of creativity in planning and practicing both science-gifted classes and invention-gifted classes. However, there were also some differences in the elements of creativity required by each class. They tended to select subjects for science-gifted classes based on regular science curriculum, while selecting subjects for invention-gifted classes focused on creative design rather than considering the practical art curriculum related to invention-gifted education. They tended to pursue and practice STEAM education in both science-gifted classes and invention-gifted classes. In a way that conforms to these class goals and points, they were using experiments and practices, providing feedback to students, and conducting evaluations. However, some shortcomings were also revealed in the processes. Educational implications of these findings are discussed.

• 한국환경과학회지
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• 제19권1호
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• pp.115-124
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• 2010

Urban watershed can be found in the visible changes in technology, the most realistic satellite images is to use the data. Satellite image data on the indicators for progress on the nature of the change of land use is consistent and repetitive information, regular observation makes possible the detailed analysis of space-time. These remote sensing techniques and the type of course and, by using the time series history, the past, the dynamic model and the randomized prediction methodology for the conversion process if the city and river basin cooperation of the space changes effectively will be able to extrapolate. For each of the main changes in river flow, depending on the area of urbanization as determined according to reproduce the duration of the relationship between the urbanization of the area and runoff can be represented as a linear polynomial expression was, if a linear expression in the two fast slew rate of 0.858 to 0.861 showed up, and fast slew rate of 0.934 to 0.974 for the polynomial are reported. Change of land use changes in the watershed of the flow is one of the most affecting elements. Therefore, changes in land use of the correct classification of rivers is a more accurate calculation of the amount of the floodgate. In particular, using the Landsat images through the image of the land use category, land use past data and calculated using the Markov Chain model and predict the future land use plan in the water control project will be used for large likely.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2017년도 춘계학술대회
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• pp.611-612
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• 2017

최근 전시 공간은 공간에 대한 직간접적인 체험을 할 수 있는 영상콘텐츠 공급자와 관람자가 몰입감을 줄 수 있는 형태로 나타나고 있으며, 제한된 공간 안에서 보다 확장된 공간을 관람자에게 제공하여 물리적인 한계를 넘어서는 가상현실까지 확대되고 있으며, 전시 디자인에서 시각적인 요소뿐만 아니라 사람과 콘텐츠 그리고 사물 사이에서 발생하는 정보서비스의 수행이 요구되고 있다. 본 연구에서는 전시 디자인의 시대적 환경변화인 사물인터넷을 활용한 전시기법의 변화와 발전방향을 모색해 보고, 영상콘텐츠의 디자인 전시에서 사물인터넷을 통한 공간의 체험하는 관람자의 스마트폰의 상호통신을 통한 정보의 축척과 사용하는 행위 속에서 영상매체(영상전시물)의 사용자 인지에 따른 다양한 형태의 변화를 살펴보고, 일반적인 전시와 사물인터넷을 통한 전시디자인 사이의 관계를 사례분석을 통한 시각과 감정의 변화에 대한 관람자의 영상콘텐츠 학습에 대한 몰입과 현장감을 확인 할 수 전시디자인을 제안한다.

• 대한안전경영과학회지
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• 제14권1호
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• pp.15-22
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• 2012

The statistics of the safety accidents in labs show that the biggest reason for them is researchers' carelessness and insecure actions. In this way, the safety accidents in labs are affected a lot by researchers' safety consciousness. Therefore, in order to prevent the safety accidents in labs, this study aims at measuring the degree of researchers' safety consciousness, grasping the elements affecting their safety consciousness and suggesting the measures to improve the lacking safety consciousness. To accomplish this goal, a survey was conducted and analyzed on the safety consciousness of 1,226 researchers working at 10 government- supported research institutes in Daedeok R&D Complex. As a results, the measures to improve researchers' safety consciousness will be suggested as follows. First, in an environmental aspect, improvement of labs' environment exposed to danger, interest and participation of CEO, regular discussion on the safety in labs, installment of safety equipments in labs, and enlargement of individual labs are necessary. Second, in an educational aspect, the safety education offered by institutes need to be enhanced, experiential safety education fit for the characteristics of research should be applied, the time for safety education must be observed, and the communication among team members through the collective education in department units and safe culture through the campaigns to enhance safety consciousness have to be established. Third, in a systematic aspect, sanctions have to be imposed on the researchers who do not attend safety education, the number of safety supervisors and safety budget of labs should be increased, a safety certification system need to be introduced when a lab is built, the problems in safety have to be open to all departments and rewards for the persons of merit in labs should be extended.

• 한국환경교육학회지:환경교육
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• 제22권1호
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• pp.43-55
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• 2009

The purpose of this study was to investigate the influences of environmental education program through educational theatre on student's environmental literacy of 5th graders in an elementary school in Seoul. The students were divided into an experimental group and a control group. Then, the experimental group had the emotion-centered environmental education program using educational theatre, and the control group had the regular education process, which is a general lecture about the environment. The SPSS 12.0 program was used to analyze the results. The major result of the study was as follows. First, the researcher was able to develop and apply professor-learning model for the environment education using the educational theatre by abstracting and recreating environment-related contents from the 5th grade curriculum. Second, the study has showed that applying the emotion-centered program using the education theatre for the environment education certainly contributes to the improvement of the environment knowledge of the elementary students. Third, the emotion-centered environment education program has influenced evenly on the elements of the environment knowledge divided by the four goal levels of the environment education. Finally, the higher the student's emotional quotient is, the more improvement of the environment knowledge the student gets when using the emotion-centered environment education program using the education theatre. In conclusion, the emotion-centered environment education program using the education theatre is a usable method to the elementary schools, and has a positive effect on increasing the environment knowledge of 5th grade students. In the time of requiring the diverse environment education methods, this program is worth to try as a new education method. Therefore, it is necessary to research more on the professor-learning activities related to this study.