• The Journal of Engineering Geology
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• v.15 no.2 s.42
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• pp.201-212
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• 2005

A photogrammetric camera system and a software have been built for capturing planned stereo images. To evaluate the system,25 planar data from a constructed rock slope were measured using both geological compass and photo system. Comparison of the data groups from both system showed matching relationship that falls within the error range of $5.25\pm4.53$ in strike and $3.18\pm3.17$ in dip angles, when the 2 standard deviation error distributions were considered. To evaluate the errors of the Photo matching and non planarity of the surface, orientations of the same plane were repeatedly measured 20times. These measurements showed error ranges of $8.2\pm3.4$in strike and $6.6\pm3.4$ in dip angle, considering the same error distributions. Measured strikes and dips were compared with the corresponding compass measurements in 5 constructed. slopes to test the system. Stereonet plots showed that the photo system measured data coincided well with the compass measurements. With these evaluations, the photo system can measure the planar structure in inaccessible locations with reliable accuracy at the same time reducing the data gathering period therefore resulting to an efficient geological survey.

• Korean Journal of Childcare and Education
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• v.6 no.2
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• pp.83-115
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• 2010

The purpose of this study is to reveal the insights that teachers has learned through developing preschooler's classroom into field-trip-oriented ones with role play areas. The data of this study was collected from participatory observation and in-depth interviews, which included videos, photos, teachers' journal, descriptive questionnaire, and interview records. The whole process of organizing role-play oriented class was composed of four steps: activities before the trip, activities on-the-spot, activities after the trip, and its evaluation. Firstly, activities before the trip were making the lists of questions, deciding children who ask the questions, making rules on the trip, understanding the purpose of the trip. Secondly, on-the-spot activities included having a tour of the place and asking the questions. Thirdly, activities after the trip was constructing the classroom into small real world with various sections. This required the teachers to reflect the field trips, make plans how to construct, prepare for the data, and furnish the classroom with role-play areas. In the process of furnishing the classroom with small real world, the field trips played a big role as the learning opportunities for language development, and keeping public rules.

• Spatial Information Research
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• v.15 no.2
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• pp.169-180
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• 2007

Applicability of Land-based MMS(Mobile Mapping System) having been increased gradually as digitalization of administrative operation and construction of integrated systems of the government and provincial government are growing up. As these requirements, the case can be occurred that the facilities should be surveyed rapidly in the specific area. At this case, the real time field processing method is more necessary than the post processing method and data processing speed should be an essential element as important as accuracy. In this study, the two space intersection methods used in photogrammetry were programmed and compared with each other to select more proper method for the three dimensional positioning in the field processing. Especially, at the analytic space intersection, the traditional close range terrestrial photogrammetry was modified and applied to that to adapt to MMS's characteristics that camera position and attitude are changed according to the vehicle movement. As a result, the difference of the accuracy between two methods is not significant but at the calculation time, the analytic space intersection is faster three times than the space intersection using collinearity condition.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.9 no.1
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• pp.17-25
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• 1991

A foundation excavation is necessarily included in construction works of structures. Involving the dangers of collapse, large-scaled excavation walls require periodic deformation measurements. As only relative displacements and acquired and surface measurements can not be made with the conventional measuring methods, the up-to-date method which can overcome these weaknesses is required urgently. Terrestrial photogrammetry is the method by which absolute deformation amounts of many points can be taken out at a distance from object in short time. The objective of this study is to suggest application propriety of terrestrial photogrammetry to the measurement of excavation walls. For it, we devised same position photography(S.P.P) and possibility of SPP proved through basic experiment. SPP was very speedy photographing method. We found out the fact that as the degree of overlap increase, accuracies of results increase. As a result of applying to excavation side-wall, we detected consistent displacement in 3 dimension each direction within the limits expectional accuracy. If control surveying could be carried out more quickly and accurately, the deformation displacement could be analyzed more effectively.

• Journal of the Korea Convergence Society
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• v.10 no.3
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• pp.7-14
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• 2019

With the development of information and communication technology, we have been able to access and manage documents containing corporate information anytime and anywhere using smart devices. As the work environment changes to smart work, the scope of information distribution is expanded, and more efforts are needed to manage security. This paper proposes a file sharing system that enables users who have smart devices to manage and share files through mutual cooperation. Proposed file sharing system, the user can add a partner to share files with each other when uploading files kept by spliting the part of the file and the other uses an algorithm to store on the server. After converting the file to be uploaded to base64, it splits it into encrypted files among users, and then transmits it to the server when it wants to share. It is easy to manage and control files using dedicated application to view files and has high security. Using the system developed with proposed algorithm, it is possible to build a system with high efficiency even for SMEs(small and medium-sized enterprises) that can not pay much money for security.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.28 no.6
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• pp.663-668
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• 2010

In this study a stereo digital camera system was developed. Using this system, we can collect informations such as coordinates, lengths of all objects shown in the photo image just by taking digital photograph in field. This system has the advantage of obtaining stereo images with settled exterior orientation parameters, while the accuracy slightly worsen because in a close range photogrammetry with stereo digital camera system, the base line distance is restricted within about 1m. We took images with various exposure distances and angles to objects for experimental error assessment, and analyzed the affection of image coordinates errors.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2008.10a
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• pp.7-12
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• 2008

근래에 들어 급속한 산업화에 따라 하천 고유의 특성을 간과한 채 개발 위주의 하천 정비사업이 시행되고 있으며 이는 하천의 인공화 및 생태계의 교란 등 많은 문제점을 낳고 있다. 이에 따라 하천 및 하도 환경에 미치는 영향이 심각할 뿐만 아니라 홍수 피해 또한 급격히 증가하고 있다. 지금까지의 치수 위주의 하천 정비를 벗어나 친환경적인 하천으로의 복원 사업이 필요한 실정이며, 이는 새로운 하천 관리 기술의 도입이 필요함을 의미한다. 따라서 본 연구에서는 항공사진과 GIS기반의 하천 시계열 분석을 수행하여 새로운 하천 관리 기술 도입에 응용할 수 있는 방안을 제시하고자 하였다. 분석을 위하여 댐 하류의 하천교란 및 적응현장 시범지역을 선정한 후 대상 지역의 항공사진을 GIS화하여 하천 교란 실태를 분석하는 데에 필요한 저수로와 제방 및 기타 자료를 shape 파일 형태로 생성하였다. 생성된 자료를 바탕으로 하천의 사행도 및 유로 변동 현황 분석을 실시함에 따라 하천의 변화 양상을 확인하였으며 대상 하천의 사행도 및 저수의 구체적인 제반 수치를 제시할 수 있었다. 또한 분석 결과를 바탕으로 현재 이루어지고 있는 하천의 정비 및 복원 사업이 하천의 흐름에 어떠한 영향을 미치는 지 예측을 가능하게 하였다. 본 연구에서 규명된 경년별 하천 형태의 변화 추세와 하천 부지의 물리적 특성 변화 양상을 기본 자료로 한다면 하천 관리에 있어 수리 수문학적 분석이 용이하리라 사료된다. 향후 연구에서는 GIS기반의 하천 관리 방안 수립에 대한 심층 연구가 뒤따라야 할 것이다.

• Journal of Korean Society for Geospatial Information Science
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• v.14 no.1 s.35
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• pp.75-83
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• 2006

Satellite imagery is generally used for investigating the damage from natural disaster for wide area and remotely piloted vehicle or aerial photos are used for the local damage. But for more detailed information such as damages of public facilities, these methods are inadequate and so in this case field surveying has been carried out. We tried to estimate the damage of public facilities faster and more accurately using photogrammetric method. We developed a digital stereo camera system by fixing two digital cameras on a frame, and with this system the photos of actually damaged areas were collected. The damages were estimated from these stereo photos. Then the estimated data was compared with field surveying data in order to verify our system.

• Proceedings of the KSMRM Conference
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• 2001.11a
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• pp.106-106
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• 2001

목적： 일반인과 외상성 스트레스 장애환자들(PTSD)에서 동일한 공포 자극에 대한 기능적 뇌 자기ㆍ공명영상에서 뇌 활성화 부위의 차이를 알아보고자 하였다. 대상 및 방법： 대조군 (여자9명)과 외상성 스트레스 장애로(PTSD) 진단된 환자군 (여자9명)을 대상으로 하였고 모두 오른손잡이였다. 외상성 스트레스 장애군은 모두 교통사고와 관련되어 있었다. 1.5T MR 기기에서 EPI BOLD 기법을 이용하여 24개의 axial slice를 얻었으며, 시각자극으로 교통사고 현장 사진과 비교군으로 체크 무의 사진을 무작위로 배열하여 각각 1초씩 보여 주었다 (event related design). SOA (Stimulus Onset Asynchrony)는 3.5초로 하였고 전체 영상은 10분 동안 얻었다. 모든 환자에서 기능적 자기공명 영상은 1차례 시행하였다. 영상후 처리는 SPM 분석 프로그램을 사용하였으며 황성화 신호의 유의수준은 p=0.01을 기준으로 활성화 영상을 얻었다. 활성화 신호를 육안으로 비교 분석하였고 해마, 편도핵, 전전두엽의 활성화 정도를 중심으로 평가하였다.

• Journal of Korean Society for Geospatial Information Science
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• v.11 no.3 s.26
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• pp.3-11
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• 2003

This study has made photographing respectively by changing the photographic distance, converging angle, picturing direction by use of Rollei d7 metric and d7 $metric^{5}$ that is a measurement digital camera. And also in order to minimize the errors happened at the relative orientation, we have sorted out the round target that the relative orientation is automatically on the programming and have calculated RMSE by carrying out the bundle adjustment. We think that such a study could be used as very important basic data necessary in deriving the optimal photographic conditions by the close-range digital photogrammetry and in judging such a degree.