• The Journal of the Korea Contents Association
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• v.18 no.8
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• pp.638-645
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• 2018

'42nd Broadway' is one of the most authentic, genuine and renowned musical pieces among the numerous musicals. By approaching every element in the Backstage from the perspective of an actor who is apart of the show, not a professional photographer, rather than an the usual objects on the Front Stage which is imprinted in the minds of the ordinary people through the media or the numerous flyers sent from the theaters, intented to describe the life as it is in the Back Stage by examining various elements such as the sets or make-up rooms, rather than the momentary, technically staged imageries. In the industrial aspect as well, the implication of this documentary would be that a more realistic set of photography was provided instead of the existing ones that usually focused on the'staged,' or 'guarded' images of the musical as shown in the promotional materials or the Front Stage still cuts.

• Transactions of the Korean Society of Mechanical Engineers
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• v.19 no.11
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• pp.3054-3062
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• 1995

Recently, the improvement of fuel economy and the reduction of exhaust smoke and NOx have been successfully achieved by supplying diesel engines with emulsified diesel oil with water particles. In the present paper, the difference between the combustion of injected emulsified fuel and that of diesel oil spray is clarified by means of taking high-speed and color photographs of the flames in the engine cylinder. As the results, the two kinds of fuels show different combustion behavior each other in the growth of initial flame and in the termination of combustion process in the cylinder. Then, suitable combustion chamber design for the use of emulsified fuel is discussed on the basis of experimental data for various distribution of spray in different kinds of piston cavities. Some methods of clearing troubles caused by emulsified fuel injection are also discussed on the basis of performance tests with a remodeling test engine.

• Journal of Yeungnam Medical Science
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• v.18 no.1
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• pp.123-137
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• 2001

Background: The purpose of this study is to evaluate the accuracy of measurements obtained from 3-dimensional computerized tomography and 3-dimensional cephalogram constructed by using the frontal and lateral cephalogram of six human dry skulls. Materials and Methods: After CT scans and each cephalograms were taken, 3-dimensional coordinates (X, Y, Z) of landmarks were obtained using computer programs. In this study, the accuracy of both methods were determined by means of 14 linear measurements compare with caliper measurements. Results: The standard deviation of landmarks of 3-dimensional CT and 3-dimensional cephalogram were 0.23 mm, and 0.30 mm in X axis, 0.27 mm and 0.25 mm in Y axis, and 0.27 mm and 0.31 mm in Z axis. In both methods, the standard deviation were less than 0.5 mm in all landmarks, and the most of landmarks showed less than 1 mm in range. Concerning the accuracy, the mean difference between 3-dimensional CT and manual measurements was 0.33 mm, and 1.13 mm between 3-dimensional cephalogram and manual measurements. The distance between RGo and LGo showed the largest difference (2.03 mm). There were highly significant, and large correlation with manual measurements in both methods (p<0.01). Conclusion: It is concluded that closeness of repeated measures to each skulls reveal the precision of both methods. Computerized tomography and cephalogram for 3-dimensional measurement of maxillofacial structure are equivalent in quality to caliper measurements.

• Journal of The Korean Association of Information Education
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• v.26 no.5
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• pp.317-325
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• 2022

In textbooks, illustrations are used to easily explain concepts and guide the exploration process. Therefore, the illustration should be presented accurately and easily. However, as a result of analyzing previous studies, it was confirmed that there was no research related to illustration analysis at all in the case of the elementary school 'software education' unit. Therefore, among the six practical textbooks developed according to the 2015 revised curriculum, the illustration of the 'software education' unit was analyzed in terms of type, function, and use, and provided guidelines for the adoption of textbooks, curriculum research, and next textbook development. As a result of analyzing six practical textbooks, all textbooks used more than one illustration per page, and the types of illustrations were used in the order of screen capture, picture, picture, table, illustration, illustrative function, and use.

• Korean Journal of Heritage: History & Science
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• v.57 no.1
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• pp.82-108
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• 2024

With the transition of archaeological recording method's transition from analog to digital, the 3D scanning technology has been actively adopted within the field. Research on the digital archaeological digital data gathered from 3D scanning and photogrammetry is continuously being conducted. However, due to cost and manpower issues, most buried cultural heritage organizations are hesitating to adopt such digital technology. This paper aims to present a digital recording method of relics utilizing open-source software and photogrammetry technology, which is believed to be the most efficient method among 3D scanning methods. The digital recording process of relics consists of three stages: acquiring a 3D model, creating a joining map with the edited 3D model, and creating an digital drawing. In order to enhance the accessibility, this method only utilizes open-source software throughout the entire process. The results of this study confirms that in terms of quantitative evaluation, the deviation of numerical measurement between the actual artifact and the 3D model was minimal. In addition, the results of quantitative quality analysis from the open-source software and the commercial software showed high similarity. However, the data processing time was overwhelmingly fast for commercial software, which is believed to be a result of high computational speed from the improved algorithm. In qualitative evaluation, some differences in mesh and texture quality occurred. In the 3D model generated by opensource software, following problems occurred: noise on the mesh surface, harsh surface of the mesh, and difficulty in confirming the production marks of relics and the expression of patterns. However, some of the open source software did generate the quality comparable to that of commercial software in quantitative and qualitative evaluations. Open-source software for editing 3D models was able to not only post-process, match, and merge the 3D model, but also scale adjustment, join surface production, and render image necessary for the actual measurement of relics. The final completed drawing was tracked by the CAD program, which is also an open-source software. In archaeological research, photogrammetry is very applicable to various processes, including excavation, writing reports, and research on numerical data from 3D models. With the breakthrough development of computer vision, the types of open-source software have been diversified and the performance has significantly improved. With the high accessibility to such digital technology, the acquisition of 3D model data in archaeology will be used as basic data for preservation and active research of cultural heritage.

• Journal of Dental Rehabilitation and Applied Science
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• v.35 no.3
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• pp.113-122
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• 2019

Tooth wear is gradually increasing with increasing life expectancy. In particular, it is important to establish a treatment plan in the early stages so that it does not proceed to moderate or severe wear stages. It is essential to diagnose tooth wear accurately in order to plan a treatment for it. There are many risk factors including age, diet, and drugs which affects tooth wear. For the diagnosis of a tooth wear, appropriate index and evaluation method should be used. There were various tooth wear indices such as TWI, Lussi index, BEWE, and TWES. The evaluation method includes clinical examination, dental cast examination and clinical photographs. Recently, a 3D scanner is being used to assess tooth wear. The risk factors, tooth wear evaluation system, the methods of measuring tooth wear, and related literature were reviewed. The strengths and weaknesses of each index and evaluation methods were compared to derive a proper way to diagnose tooth wear.

• The Optical Journal
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• s.120
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• pp.30-32
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• 2009

세계적인 경기 침체 영향으로 인하여 국내의 스튜디오나 일본의 스튜디오들도 예외없이 어려운 상황을 면치 못하고 있는 것이 사실이다. 그러나 똑같은 상황이지만 위기 대처방법에 따라 사진관의 성패는 실로 엄청난 차이로 나타난다. 점차 문 닫는 사진관이 늘어나고 있는 시점에서도 발전을 거듭하며 승승장구 하고 있는 사진관들은 어떠한 이유에서 일까? 본고에서는 필자가 올해 초부터 일본의 몇 개 도시를 돌아보면서 목격한, 성공적인 사진관을 꾸려나가고 있는 동경무사시의 라칸 스튜디오, 이바라키 현 히다치나가시(市)의 오노사진관, 산간지역 소도시인 나가노(長野) 이나시(市)의 Photo-st21 등의 공격적이고 체계적인 마케팅 기법 그리고 기본에 충실하면서 변화를 이끌어가는 일본의 사진관들을 소개하고자 한다.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.20 no.4
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• pp.399-404
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• 2002

In this study, it was intended to present solution for learners to understand and utilize photogrammetry more easily using economic medium except expensive measuring equipment. For this, 3D point data was analysed by generating event to stereo image on monitor, and input to CAD system automatically. so, real time vector editing and drawing with coordinates measurement were possible. The system was verified, and the monitoring for real construction was performed. so, it is expected to be utilized as a practical use software in related fields.

• Proceedings of the Korea Society for Simulation Conference
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• 2001.05a
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• pp.125-125
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• 2001

실 지형정보를 이용한 3D 가상환경은 사용자에게 좀 더 현실에 가까운 교육환경을 제공한다. 3D 가상환경에 사용되는 지형정보는 mesh를 생성하기 위한 고도 data와 mapping을 위한 위성영상이나 항공사진 등이 사용된다. 고도 데이터는 DEM,DTED와 같은 데이터 포맷이 있는데 해상도에 따라 초단위 또는 M 단위로 다양하게 분류되어 있으며 위성영상이나 항공사진도 해상도에 따라 50M∼10Cm 까지 다양하여 사용목적에 맞는 데이터 선택이 필요하다. 고도데이터와 mapping 데이터를 이용하여 기본적인 3D 지형을 생성한 후에 안개나 비, 눈, 빛, 구름과 같은 기상환경을 시뮬레이션하거나 건물이나 이정표, 또는 텍스트 같은 사용자 정보를 Vector overlay 하여 좀 더 현실감 있는 3D 가상환경을 만들 수 있다. 최근에는 인터넷이 일반화되면서 네트웍을 통해 지명데이터를 전송하고 렌더링 하고자 하는 요구가 발생하고 있다. 그러나 3차원 가상환경을 위한 지형 데이터는 2D 데이터에 비해 크기가 크고 고사양의 하드웨어사양을 필요로 하여 네트웍을 통해 전송하고 랜더링 하기에는 여러 가지 제약이 따른다. 이러한 재약을 극복하기 위해 데이터를 한꺼번에 전송하지 않고 점진적으로 전송하고자 하는 연구가 많이 있어 왔으며 점진적 메쉬나 딜로니 규칙에 기반한 TIN 압축 점진적 시각화 기법, DEM 웨이블릿 변환을 적용한 저장, 전송 렌더링 하고자 하는 연구가 시도되어 왔다.

• Journal of Cadastre & Land InformatiX
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• v.51 no.1
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• pp.79-95
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• 2021

This study evaluates the applicability of determining cadastral surveying results using drone photogrammetry during the phase of determining cadastral surveying results, which is the most important stage of cadastral surveying, but known to be hardly objective and highly probable in causing a subjective misjudgment or mistake made by a surveyor. In the experiment to analyze the accuracy of boundary point extraction from drone photogrammetry results, by comparing the coordinate area of 22 parcels extracted from 2D and 3D images with the coordinate area measured from ground survey, the difference could be quantified as RMSE of 1.44m² for 2D and 0.32m² for 3D images. In addition, experiments to evaluate the determination of cadastral surveying result based on drone photogrammetry survey showed the RMSE measure of 0.346m towards N direction and 0.296m towards Y direction in comparison to the existing surveying results through data investigation. Based on these experiments, it is judged that cadastral surveying result based on drone photogrammetry can be determined without needing to conduct a location survey with an accuracy of approximately 0.3m in the graphical area, which also leads to possibility of reducing individual errors if drones images are used along with ground survey by objectifying the process of cadastral surveying results.