• Title/Summary/Keyword: photography

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A STUDY ON THE SHAPE OF A CANAL PREPARED WITH PROFILES IN A CURVED CANAL (PROFILE을 이용한 만곡 근관 형성시 근관의 형태에 관한 연구)

  • Park, Han-Soo;Lee, Min-Koo;Kim, Jong-Jin;Lee, Jong-Yeop
    • Restorative Dentistry and Endodontics
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    • v.24 no.4
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    • pp.633-638
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    • 1999
  • The purpose of our study is to evaluate the ability of nickel-titanium(NiTi) files in maintaining the original curvature of a curved root canal during canal preparation. Curved canals on translucent resin blocks were prepared with Profiles and stainless steel files and they were placed at the platform which can reproduce the same position. The unprepared and prepared canal forms were accurately compared by double exposure technique of photography. The results were as follows : 1 NiTi files made a canal comparatively taper, but stainless steel files didn't make a canal taper, wicest at midportion and comparatively wide at a apical portion. 2. Canals preparations with no. 25 Profile.06 up to the working length were most excellent in taperness and in maintaining the original curvature. Canals prepared with no 30 Profile.06 up to the working length made a little outer transportation at a apical portion, but not severe. 3. Canal preparations with Profile GT were excellent in taperness and in maintaining the original curvature, but made more enlargement toward the inner side at the starting portion of the curvature. 4. Canal preparations with stainless steel files were not tapered and provided the largest transportation.

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Mechanical Properties of Fiber Reinforced Concrete According to Steel Fiber Dispersion (강섬유의 분포 특성에 따른 섬유보강 콘크리트의 역학적 특성)

  • Lee, Bang-Yeon;Kang, Soo-Tae;Kim, Yun-Yong;Kim, Jin-Keun
    • Proceedings of the Korea Concrete Institute Conference
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    • 2008.04a
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    • pp.921-924
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    • 2008
  • Several techniques, including transmission X-ray photography and AC-impedance spectroscopy, are available for evaluating the fiber dispersion in a fiber reinforced concrete Evaluating the fiber dispersion in fiber reinfored concrete needs since the fibers bridge crackseffectively. However, these equipment is very expensive. Therefore this paper presents the quantitative evaluation method based on the image analysis of sectional image taken using an ordinary digital camera. After detecting the fiber accurately, the fiber dispersion characteristics are represented by the coefficient such as the fiber dispersion coefficient, the number of fibers in unit area, and the distribution of the fiber orientation. Test were performed to evaluate the effectiveness of proposed method and the dispersion characteristics of fibers according placing method and flow direction. Additionally, the effect of fiber dispersion characteristics on mechanical properties was investigated. Test results shows that fiber aligned along the flow direction and more fibers placed and dispersion was better on the section parallel to the flow direction. And about 50% difference in the flexural tensile strength according to the placing method occured.

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A STUDY ON USEFULNESS OF THE REFERENCE LINE IN DIAGNOSIS OF THE FACIAL ASYMMETRY (안모비대칭의 진단용 기준선의 유용성에 관한 연구)

  • Ryu, Sung-Ho;Chang, Hyun-Ho
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
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    • v.31 no.3
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    • pp.266-273
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    • 2005
  • Purpose: To assess the relationship between soft tissue reference line and hard tissue reference line using the standardized photographs and the posteroanterior cephalometric radiographs(P-A)in facial asymmetric patients and to compare the differences of angular measurement between normal group and asymmetry group. Methods: Normal group consisted of 44 persons with normal occlusion and normal facial morphology. Asymmetry group consisted of 90 patients with facial asymmetry. Standardized facial photographs and P-A were taken in all subjects. The horizontal reference lines were bipupillary line in photographs and latero-orbitale line in P-A respectively. The vertical reference line were the line from the midpoint of horizontal reference line perpendicularly. Angular measurement of otobasion canting, lip canting, nose deviation, chin deviation, and maxillary deviation were compared and analyzed in photographs. And angular measurement of mastoid canting, mandibular canting, nose deviation, chin deviation, and maxillary deviation were compared and analyzed in P-A. Results: 1. The variables of photographs and P-A were significantly related in the asymmetry group. 2. Significant differences between all variables except for PT2 and PA2 were shown in the asymmetry group and between PT1 and PA1, PT3 and PA3 in the normal group respectively. 3. Comparison measurement scores of angular difference between control group and experimental group concerning each variable showed significant difference except for PA1. Conclusions: Soft tissue components may not compensate for underlying skeletal imbalance in nose deviation and chin deviation. The horizontal reference lines in photographs were significant related with the P-A, but angular variables between the two studies show significant differences. Therefore, we do not recommend use photography in the assessment the facial asymmetry as complemented in the P-A.

Classification of Adult Women's Fingernail Type (성인 여성의 손톱 유형 분류)

  • Kim, Ha Eun;Kim, Nam Soon;Do, Wol Hee
    • Fashion & Textile Research Journal
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    • v.22 no.4
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    • pp.504-514
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    • 2020
  • This study improves the dimensional suitability of nail tip products by reviewing the type of fingernail as seen among adult women in Korea. Subjects were 147 adult women ranging from age 20 to 40. Direct fingernails measurements were made using digital Vernier calipers and a curvature gauge. Data on various fingernail shapes were collected through indirect measurements using photography to reveal the shape characteristics of each fingernail types. In this sense, data were analyzed by statistical methods with the use of factor analysis. There were various factors considered to classify extracted fingernail types such as five factors (for the thumb), four factors (index, middle, and little fingers), and three factors (for the ring finger). The cluster analysis resulted in three types. Type 1 is a 'Square' shape characterized with wide fingernails, low height, flat, and low curvature of the cuticle line. Type 2 is 'U-round' shape characterized with narrow fingernails, high height, convex, and the highest curvature of the cuticle line. Type 3 is a 'Round' shape in which the fingernails are wide, high in height, convex, and characterized with a medium curvature of the cuticle line. The results are useful for companies that develop the free edge shape of fingernails for consumer products. The measured values of fingernail can be applied to the shape and lake setting of the nail tip product, depending on type of fingernail.

The Analysis of Using an Information Service for Supplying Information in the Rural Amenity Resources by Utilizing a Smart Phone (스마트폰을 활용한 농촌어메니티 자원 정보제공을 위한 정보서비스 이용실태 분석)

  • Son, Ho-Gi;Kim, Sang-Bum;Jo, Lock-Hwan;Choi, Jai-Ung
    • The Korean Journal of Community Living Science
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    • v.22 no.4
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    • pp.579-590
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    • 2011
  • This study focused on developing various application services for smart phones in the rural amenity resources information service. By developing application services for smart phones, this study aims to stimulate rural tourism and increase the rural tourism economy. The main findings of this study revealed that 'information for reports/cultural/recreational facilities, etc', 'maps for rural villages(food, attractions, etc)', 'regional weather information', 'traffic reports for rural villages(public transportation, etc)' and 'introduction of rural experiences (festivals, exhibitions, events, etc)' are preferentially needed as the contents services of the rural amenity resources. Moreover, it has been found that the types of services firstly needed to offer information of rural amenity resources include 'searching the information around me(where I am)', 'wayfinding such as navigation', 'information sharing function with messenger and SNS, etc', 'taking and editing photography', 'searching information of rural villages about festivals, events, etc'. These are the items that can be utilized in developing application services needed by information services of rural amenity resources. It is expected that the future real-time smart phone services for rural amenity resources will be able to reinforce the competitiveness of rural tourism by giving urban dwellers the chance to utilize the customized information whenever they want.

Experimental Proliferative Vitreoretinopathy (증식성 초자체망막증의 실험적 유발)

  • Park, Young-Hoon;Lee, Bong-Hwan;Hahn, Duk-Kee
    • Journal of Yeungnam Medical Science
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    • v.8 no.1
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    • pp.178-190
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    • 1991
  • The authors performed experimental study to produce proliferative vitreoretinopathy by intravitreal injection of homologous fibroblasts in pigmented rabbits. Twenty four eyes of 12 rabbits were divided into control and experimental groups. In experimental group, the eyes were pretreated with expanding gas, perfluoropropane for the vitrectomy. In control group, no such procedure was preceded. In both groups, $5.0{\times}10^4$, $1.0{\times}10^5$ and $1.5{\times}10^5$ cells of homologous fibroblasts were injected into the vitreous cavity. All the eyes were observed regularly with indirect ophthalmoscope followed by fundus photography. Those eyes were enucleated in 1, 2, 4 weeks for the light and electron microscopic studies. The development and severity of the proliferative vitreoretinopathy were correlated with the numbers of the injected fibroblast. This was more pronounced in the experimental group.

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A Study on the Characteristics of Geographic Photos (사진의 기록성과 예술성에서 본 지리사진)

  • Kim, Joo-Hwan
    • Journal of the Speleological Society of Korea
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    • no.72
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    • pp.37-46
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    • 2006
  • The purpose of this study is to provide a basic theory of photogeography. There is a close relationship between photos and fine arts, but lots of differences. For examples photos are arts of cognition, analytic media and time. Geographic photos are photos useful for geography. Geographic-photos are a kinds of academic photos which deals with special meaning of geographic phenomena and cognition of the certain area. According to the nature the photos available for geography, can be grouped into geographic photos and general photos. Geographical ideas, photographical skills and artistic senses are necessary to the photogeographers. Geographic photos are useful for research and educational Purpose. The aspect of research is related to the systematic geography, for example ; geomorphology, historical geography etc. In conclusion, to the photo geographer the geographic idea is more necessary than the skill of photography.

A Study on High Efficiency of Phase Grating (은염에 형성된 위상형 회절격자의 고효율에 관한 연구)

  • Kim, Nam;Gil, Sang-Keun;Park, Han-Kyu
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.26 no.3
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    • pp.145-152
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    • 1989
  • Volume phase diffraction grating is formed in 5${mu}m$ Agfa 8E75 photographic emulsion film using He-Ne laser. It is dependent on the chemical processing rather than materials themselves that high diffraction efficiency can obtained in silver halide emulsions. With potassium dichromate bleach and alcohol drying, overall efficiency of 71% (81% after allowing for reflection at the two surfaces) has been achieved at an exposure of 180${mu}J/cm^2.$ Dichromate cross-linkage and air void by rapid dehydration increase refractive index modulation depth. The grating is swollen, which is newly identified by Scanning Electronic Microscope(SEM) photography, and it causes on-Bragg at larger angle than the recording angle. It is pointed out that controlling the emulsion thickness has an important role as a potential source for high diffraction efficiency.

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Midfacial degloving approach for management of the maxillary fibrous dysplasia: a case report

  • Kang, Miju;Jee, Yu-jin;Lee, Deok won;Jung, Sang-pil;Kim, Se-won;Yang, Sunin;Ryu, Dong-mok
    • Maxillofacial Plastic and Reconstructive Surgery
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    • v.40
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    • pp.38.1-38.9
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    • 2018
  • Background: Fibrous dysplasia (FD) is a benign bone lesion characterized by the progressive replacement of normal bone with fibro-osseous connective tissue. The maxilla is the most commonly affected area of facial bone, resulting in facial asymmetry and functional disorders. Surgery is an effective management option and involves removing the diseased bone via an intraoral approach: conservative bone shaving or radical excision and reconstruction. Case presentation: This case report describes a monostotic fibrous dysplasia in which the patient's right midface had a prominent appearance. The asymmetric maxillary area was surgically recontoured via the midfacial degloving approach under general anesthesia. Follow-up photography and radiographic imaging after surgery showed the structures were in a stable state without recurrence of the FD lesion. Furthermore, there were no visible scars or functional disability, and the patient reported no postoperative discomfort. Conclusions: In conclusion, the midfacial degloving approach for treatment of maxillary fibrous dysplasia is a reliable and successful treatment option. Without visible scars and virtually free of postoperative functional disability, this approach offers good exposure of the middle third of the face for treatment of maxillary fibrous dysplasia with excellent cosmetic outcomes.

Application on the Convergence Technology for Culture Festival Composition of Riverside Space (강변공간의 문화축제 조성을 위한 융복합 기술의 적용)

  • Yeon, Sang-ho
    • The Journal of the Convergence on Culture Technology
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    • v.4 no.1
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    • pp.253-261
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    • 2018
  • Cheongpungho number is located in the center of South Korea Jecheon Peninsula, Chungju cheongpungho be formed by hydroelectric dam construction in 1984, now has been changed to a large man-made freshwater sites during the past 30 years. Recent Jecheon government is developing natural healing resort and entertainment performances for the future, in comparison to the feasibility study of the region using remote sensing technology and site planning was conducted in geographic research and analysis, and as a result, we have a very effective to incorporate the color maps using aerial photography and digital terrain analysis and usage analysis to prove and was in the riverside area for the future of the business and the research proposal facilities and events of the brand, to be more multi-cultural festival form apply new high-tech fusion experiments suggest new direction for future tourism.