• 환경생물
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• 제37권3호
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• pp.343-350
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• 2019

도토리거위벌레는 큰턱을 이용하여 도토리에 구멍을 뚫고 가지를 자르는 독특한 행동을 한다. 이러한 행동을 이해하기 위해 다양한 현미경을 이용하여 구기의 해부학적 특징을 관찰하였다. 실체현미경을 이용한 연구에서는 도토리거위벌레 수컷의 평균 내전건과 외전건의 두께는 각각 32.87 ㎛, 53.83 ㎛이었고, 암컷의 평균 내전건과 외전건의 두께는 각각 40.81 ㎛, 75.55 ㎛이었다. 내전건과 외전건의 유의한 두께 차이로 인해 큰턱을 닫는 힘보다 벌리는 힘이 더 강하다는 것을 유추할 수 있다. 광학현미경을 이용한 관찰에서는 주둥이 안쪽에 위치한 내전건과 외전건의 너비 차이와 큰턱 쪽에서는 원형으로 위치하며 두부로 갈수록 납작해져 두부 외피 안쪽에 근육으로 연결된다는 것을 확인할 수 있었고, 내전건의 위치와 모양의 변화에 대한 관찰을 수행하였다. 전자현미경을 통한 연구에서는 외전건이 내전건보다 더 굵으며 이로 인해 큰턱을 안쪽으로 당기는 힘보다 바깥쪽으로 밀어내는 힘이 더 크다는 것을 확인하였다. 관찰 결과를 바탕으로, 도토리거위벌레, 밤바구미, 왕거위벌레의 큰턱의 형태와 이빨의 위치 그리고 큰턱의 움직임에 대해 비교 분석하였고, 도토리거위벌레가 보여주는 특징적인 행동은 해부학적/형태적 특징과 연관되어 있음을 확인할 수 있었다.

• Applied Microscopy
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• 제2권1호
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• pp.39-46
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• 1972

There are many kinds of microscopes suitable for general studies; optical microscopes(OM), conventional transmission electron microscopes (TEM), and scanning electron microscopes(SEM). The optical microscopes and the conventional transmission electron microscopes are very familiar. The images of these microscopes are directly formed on an image plane with one or more image forming lenses. On the other hand, the image of the scanning electron microscope is formed on a fluorescent screen of a cathode ray tube using a scanning system similar to television technique. In this paper, the features and some applications of the scanning electron microscope will be discussed briefly. The recently available scanning electron microscope, combining a resolution of about $200{\AA}$ with great depth of field, is favorable when compared to the replica technique. It avoids the problem of specimen damage and the introduction of artifacts. In addition, it permits the examination of many samples that can not be replicated, and provides a broader range of information. The scanning electron microscope has found application in diverse fields of study including biology, chemistry, materials science, semiconductor technology, and many others. In scanning electron microscopy, the secondary electron method. the backscattererd electron method, and the electromotive force method are most widely used, and the transmitted electron method will become more useful. Change-over of magnification can be easily done by controlling the scanning width of the electron probe. It is possible. to continuously vary the magnification over the range from 100 times to 1.00,000 times without readjustment of focusing. Conclusion: With the development of a scanning. electron microscope, it is now possible to observe almost all-information produced through interactions between substances and electrons in the form of image. When the probe is properly focused on the specimen, changing magnification of specimen orientation does not require any change in focus. This is quite different from the conventional transmission electron microscope. It is worthwhile to note that the typical probe currents of $10^{-10}$ to $10^{-12}\;{\AA}$ are for below the $10^{-5}$ to $10^{-7}\;{\AA}$ of a conventional. transmission microscope. This reduces specimen contamination and specimen damage due to heatings. Outstanding features of the scanning electron microscope include the 'stereoscopic observation of a bulky or fiber specimen in high resolution' and 'observation of potential distribution and electromotive force in semiconductor devices'.

• 대한수학교육학회지:학교수학
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• 제16권3호
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• pp.519-542
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• 2014

이 연구에서는 현직 중등학교 교사 45명이 통계 영역의 수업을 분석한 결과를 검토하여 수업 실행과 관련된 교사 지식의 특징을 기술함으로써 교사의 수업 전문성 신장과 관련된 논의에 시사점을 얻고자 하였다. 이를 위해 우선 교사들의 수업 관찰 결과를 분석하기 위한 이론적 틀을 개발하고 이를 토대로 교사들이 작성한 수업 분석문의 세부 내용을 코드화하였다. 이렇게 코드화된 분석문을 통해 통계 지도와 관련된 교사 지식의 실제적 특징을 확인하여 '수업의 목적', '교사의 역할과 담화', '자료와 공학 도구'의 관점에서 통계 교육과 관련된 몇 가지 이슈를 추출하였다.

• 한국측량학회지
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• 제26권2호
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• pp.117-127
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• 2008

우리나라는 여름철 집중호우와 태풍으로 인해 산사태가 빈번히 발생하고 있으며, 이로 인해 많은 인명피해와 경제적 손실이 발생하고 있다. 특히 강원도 지역의 대부분 도로가 산악지형에 위치하고 있어 산사태의 위험에 노출되어 있다. 따라서 산사태를 막기 위한 대책마련이 시급한 실정이며, 이를 위해 다양한 사면조사 및 사면유지관리를 위한 첨단 관측기술이 요구되고 있다. 최근에는 광섬유 센서, GPS, CCD 카메라, Total Station, 위성영상을 이용한 사면관측 기술이 활용되고 있으나 경제성, 정밀성, 효율성 등의 제약으로 인해 활용빈도가 떨어지고 있는 실정이다. 그러므로 본 연구에서는 지상라이다를 이용하여 시범사면을 모니터링한 후 정확도를 평가함으로써, 지상라이다의 사면관측을 위한 적용 가능성을 분석하고자 하였다. 그 결과 수 mm의 미세변위를 높은 정확도로 관측할 수 있었으며, 신속하게 사면의 지형정보를 획득할 수 있었다.

• 한국콘텐츠학회논문지
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• 제18권2호
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• pp.269-279
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• 2018

본 연구는 초등 영어 우수 수업으로 선정되어 교육포털사이트에 업로드 되어 있는 수업 동영상을 전사하고, COLT 2부와 TALOS 저추론 분석법을 사용하여 이를 분석하여 의사소통성과 수업의 특징을 파악한 연구이다. 그동안 COLT를 사용하여 초등 영어 수업의 의사소통성을 파악한 연구는 많았지만, TALOS 분석을 한 연구는 부족했다. 또한, 대부분의 연구가 초등 영어 수업이 의사소통적이지 않다는 결론이 대다수였다. 이에, COLT 2부와 TALOS를 사용하여 초등 영어 수업을 분석하여 의사소통성을 파악하고, 초등영어의 성격과 관련하여 나타나는 특징을 알아보았다. 서울교육포털사이트에 우수 수업 동영상으로 업로드되어 있는 1개의 수업 동영상을 COLT(Communitive Orientation of Language Teaching)와 TALOS(Target Language Observation Scheme)를 활용하여 분석한 결과, 이 수업은 높은 학생 발화의 양과 질, 학생의 높은 참여, 주도적인 발화의 시작, 예상 불가 정보 발화의 높은 비율, 확장 비율이 높은 발화 지속의 양태 등으로 의사소통중심 수업임을 확인하였다. 수업에서 두드러지게 나타난 학생의 높은 참여, 정의적 요소의 중시, 재미있게 몰입하는 활동 속에서 무의식적으로 충분한 반복을 통한 내재화 등은 초등 영어 특성과 관련된 본 수업의 특징이다.

• 한국과학교육학회지
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• 제16권2호
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• pp.154-163
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• 1996

In Korea, previous survey in science education mainly dealt with Quantitative variables. Qualitative ethnographic observation can bring deeper understanding of the context of school lesson and it's feature. The purpose of this study was to develop qualitative understanding about the learning experiences provided in middle school and students' responses to them through observation and interview and to investigate it from a constructivist perspective. Six lessons of the 9th grade were observed and recorded on the video tape. The topics of the lessons were potential energy, kinetic energy and conservation of mechanical energy. We had also unstructured interview with the teacher and three groups of students. The teacher's deductive explanation starting from scientific definition and quantitative problem solving using formula were the main features of the classroom lectures. The video - watching lesson was taking the role of a break rather than being seen as a useful tool for science learning and teaching by both students and the teacher. The teacher's perception about the lab experiment was not supported by the responses from the students. The teacher and students preferred problem-book to textbook for their teaching and learning. From a constructivist's perspective, however the teacher seemed to have intention of introducing daily life context, he couldn't unfold it to main context of the lessons. Students were so accustomed to passive learning that they did not express directly their complaint about their learning and did not participate in planing and controling their learning. The teacher and the students believed the scientific knowledge came from an exact experiment. There was a cooperation to seek right answer rather than a social process of making sense of knowledge. In conclusion, the observed science lessons of a middle school showed typical cross section of teacher - centered, passive learning environment, which is far from constructivist perspective.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2008년도 추계 학술논문 발표대회
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• pp.245-249
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• 2008

The purpose of this study is to test performances of 14 types of root barrier materials by applying testing plants and soils suitable for weather and natural features of Korea. For testing plants, Plioblastus pygmaed Mitford A. and Pyracantha angustifolia have been selected. For testing soil, mixture of pearlite and peat moss in 3:1 ratio(volume). Testing container has been fabricated with duplicated structure having inner and outer containers. And the outer container has 2 hinges on its side wall to allow opening and closing. Wet rock wool with 50mm in thickness has been inserted between inner and outer containers to allow root to penetrate through root barrier material and continue to grow. We planted 12 Plioblastus pygmaed Mitford A. and 4 Pyracantha angustifolia per one testing container. Three testing samples have been made for 1 type of root barrier material, which become a total 42 specimens. Planted testing samples have been installed within the greenhouse, which will be observed regularly for 2 years from now on. We started test from July 11, 2008 and had performed intermediate observations every month for initial 3 months. From the 3rd intermediate observation on Sept. 18, we confirmed that 6 types of root barrier materials have penetrated roots. Even though two types of them(EDPM Sheet, Polyethylene Sheet) have been generally used as root barrier materials for roof planting system, all of three testing samples have a lot of penetrated roots. This result proves that it is not reasonable to introduce testing methods of root barrier from Europe or Japan.

• 대기
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• 제24권1호
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• pp.101-110
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• 2014

This study estimates and evaluates the daily January temperature from 2003 to 2012 with 30 m-resolution over South Korea, using a modified Parameter-elevation Regression on Independent Slopes Model (K-PRISM). Several factors in K-PRISM are also adjusted to 30 m grid spacing and daily time scales. The performance of K-PRISM is validated in terms of bias, root mean square error (RMSE), and correlation coefficient (Corr), and is then compared with that of inverse distance weighting (IDW) and hypsometric methods (HYPS). In estimating the temperature over Jeju island, K-PRISM has the lowest bias (-0.85) and RMSE (1.22), and the highest Corr (0.79) among the three methods. It captures the daily variation of observation, but tends to underestimate due to a high-discrepancy in mean altitudes between the observation stations and grid points of the 30 m topography. The temperature over South Korea derived from K-PRISM represents a detailed spatial pattern of the observed temperature, but generally tends to underestimate with a mean bias of -0.45. In bias terms, the estimation ability of K-PRISM differs between grid points, implying that care should be taken when dealing with poor skill area. The study results demonstrate that K-PRISM can reasonably estimate 30 m-resolution temperature over South Korea, and reflect topographically diverse signals with detailed structure features.

• 천문학회보
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• 제37권2호
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• pp.115.2-115.2
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• 2012

In this study we have used the data of various instruments onboard the THEMIS spacecraft to study the characteristics of the outer radiation belt during the ascending phase of solar cycle 24. The most astonishing result is that we discovered four long-term (a month or so) periods during which the belt has nearly disappeared. The first disappearance started late 2008, followed by reappearance in ~a month, and three more similar events repeated until early 2010 when the belt has reappeared. This is well revealed at 719 keV electrons, which is the currently available uppermost energy channel from the THEMIS SST observation, but also seen at even lower energies. Overall consistent features were confirmed using the NOAA-POES observations. The vanished belt periods are associated with extremely weak solar wind conditions, low geomagnetic disturbances (in terms of Kp and AE/AL), greatly suppressed wave (ULF and chorus) activities, greatly reduced storm and substorm activities (little source particle supply), and expanded plasmapause locations. The direct observations of such events shed light on the fundamental question of the origin of the radiation belt, which is the main focus of our presentation.

• 한방안이비인후피부과학회지
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• 제12권1호
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• pp.387-395
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• 1999

This observation was aimed to evaluate the clinical manifestations and clinical incidence of $Beh{\varsigma}et's$ Disease. It was records of patients seen in the period between January 1992 and December 1998 at the Department of Dermatology, Oriental Medical Hospital, Kyung Hee University. $Beh{\varsigma}et's$ Disease is a chronic, systemic disease which manifests itself as recurrent, multiple lesions in many organs, including the skin. The clinical features of $Beh{\varsigma}et's$ Disease are important as there is no reliable method of laboratory diagnosis. The results were summarized as follows; 1. The total number of patients were 34, including $42\%$ male and $52\%# female. 2. The pick incidence of age group was 30 to 39($44\%$). 3. The most frequent duration was from 2 years to 5 years($41\%$). 4. According to Diagnostic Criteria of the $Beh{\varsigma}et's$ Disease Research committee of Japan, there were $41\%\;of\;Incomplete\;type,\;29\%\;of\;Suspected,\;24\%\;of\;Complete,\;6\%$ of Passible. 5. The most common major symtom is a oral u1cer($91\%$), and there were erythema nodosum like lesion($79\%$), genital ulcer($56\%$), problem of the eyes($38\%$). 6. The most common minor symtom was arthritis($32\%$). 7. The first main symtom were oral ulcer($50\%$), erythema nodosum like lesion($26\%$), problem of the eyes($18\%$). 8. There were 2 cases of Intestinal $Beh{\varsigma}et's$ Disease and 5 cases of uveitis. 9. The most frequently treated prescription was Eunhwasagantang which occupied 79 of all, Gamisopunghwalhultang($44\%$) a.nd Gamipadoksan($41\%$), Gamiguakjungsan($24\%$) in that order of frequency.