• Title, Summary, Keyword: 사진농도

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A Study on Diesel Spray and Flame by Rapid Compression Machine (급속압축장치에 의한 디이젤 분무 , 화염의 연구)

  • 안수길
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.19 no.1
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    • pp.40-45
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    • 1983
  • The paper describes an experimental investigation of axisymmetric diesel spray and flame which is held in rapid compression machine (RCM) with electromagnetic single injection nozzle. The axisymmetric diesel spray and flame are taken with high speed photograph and analysis it with image processor. The data presented include fuel concentration of spray, flame temperature, soot concentration of flame in axial and radial direction at a moment and compared it with each other.

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A Study on the Measurement of the Personal Exposure Dose by Film Badge Dosimeter (필름배지선량계에 의한 개인피폭선량 측정에 관한 연구)

  • Chung, Woon-Kwan
    • Journal of Radiation Protection and Research
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    • v.19 no.1
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    • pp.37-50
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    • 1994
  • The experimental evaluation of exposure conversion formula using the relationship between optical photo-density, exposure dose and the quality of radiation characteristics of radiation energy to X-ray and ${\gamma}-rays$. The film badge dosimeter is analysed by exposure conversion formula which evaluate image fading characteristics for development time and directional characteristics for incident beam angle. In conclusion, exposure conversion formula evaluated of this study is satisfied with quality decision criterion of the film badge dosimeter.

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A study on Phantom image of Mammography in some area (일부지역 유방촬영술의 팬톰영상에 관한 연구)

  • Kang, Se-Sik
    • Journal of radiological science and technology
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    • v.28 no.4
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    • pp.301-306
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    • 2005
  • Purpose : The goal of this study was to survey the quality control of mammographic phantom images in some area. Methods : Between May and June, 2005, I have got a total of 47 mammographic phantom images collected from 49 hospitals and were analized about phantom score of fibrous, speck, tumor with enlargement scope. By critic level of experimental mammographic phantom case images, classified through the pass case that fibrous score 4, speck score 3, tumor score 3 over. Result : It passed 33case (70.3%), failed 14 case (29.7%) about 47 case. Passing case images showed tube voltage $23{\sim}30\;kVp$, tube current $20{\sim}60\;mAs$, photographic density $0.48{\sim}1.77$ Conclusion : It passed case about 70.3% of mammographic phantom image in some area. Optimum range of tube voltage, tube current, photographic density have to use to get fine quality of mammographic images.

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A Study on Visual Attention Factors for Advertising Photographs (광고 사진을 위한 시각적 주의 기초요인 연구)

  • Kim, Dae-Wook
    • Journal of Digital Convergence
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    • v.17 no.3
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    • pp.413-425
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    • 2019
  • We see many images every day, some of these images are stored in memory, and the majority are immersed in the unconscious world. Visual elements are seen by personal attention or by visual or biological attention factors. Specific and clear discovery of this visual attention has not yet been made. However, there is an interesting discussion of this visual attention in the fields of interior, design, visual perception, advertising, and psychology. Advertising photographers are expected to produce what their work will have on viewers and consumers. However, the adjustment of subject, exposure, color, or post-production, which could have a visual effect on the consumer, was determined only by the photographer's senses rather than the experimental verification. The advertisement photographs provide a specific image related to the object to be advertised and deliver a certain message. Therefore, it is necessary to understand the effect of the image in a certain visual way. According to previous studies, there are two major factors that affect the visual impression of the viewer. One is the factor depending on the type and content of the subject and the other is the factor about the density and color of the subject. The purpose of this study is to investigate the meaningful changes in the visual perception depending on the shape, content, color and tone of the subject, which can be called the main subject, And to analyze the effects of I will study some implications of visual elements through various analyzes.

사진 초증감 처리장치의 제작

  • Kim, Gang-Min;Lee, Jong-Ung;Sim, Gyeong-Jin
    • Publications of The Korean Astronomical Society
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    • v.6 no.1
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    • pp.50-61
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    • 1991
  • 여러가지 초증감 처리법 중에서 굽기(baking), 쐬기(soaking)과 진공처리(evacuation)를 할 수 있는 초증감처리장치를 설계 제작하고 초증감 처리 결과 시험에 이용되는 표준감광기 (sensitometer)와 농도쐐기 (step wedge)를 제작하였다. 이를 천체사진용 건판인 103a-O와 IIIa-J에 시험적으로 사용하여 감도와 신호대 잡음비의 증가를 확인하였다.

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Quality Improvement on Aerial Photographs (항공사진 품질향상 방안)

  • 조우석;이성훈;최승식;황현덕;이하준
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.21 no.3
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    • pp.277-287
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    • 2003
  • As primary source data toward the systematic and efficient management of national land, the aerial photographs have been utilized in many different areas. However, the quality of aerial photographs does not meet the requirement of the users due to unidentified miscellaneous reasons. Aiming for the improvement of the quality of aerial photographs, we first investigated the current status of domestic rules and working procedures related to aerial photographing and film processing in great details. In addition, we investigated and analyzed those of advanced nations such as U.S.A., Canada, G.B. and so on. It was drawn from the comparison and analysis that the poor quality of domestic aerial photographs resulted from lack of the quantitative and objective standards on aerial photography specification as well as poor condition and aging problem of equipments such as aerial camera and film developing equipment. In this paper, we proposed a stepwise strategic plan which consists of the aerial photography specification and quantitative quality control standard taking into consideration the current status of domestic rules and working procedures.

Recovery of Silver from Artificial Photographic Wastewater by Continuous Flow Electrolytic Process (순환공정법(循環工程法)을 적용(適用)한 인공(人工) 사진폐액(寫眞廢液)으로부터의 전해채취(電解採取)에 의한 은(銀)의 회수(回收))

  • Chung, Won-Ju;Kim, Dong-Su
    • Journal of the Korean Institute of Resources Recycling
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    • v.16 no.1
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    • pp.68-72
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    • 2007
  • The influences of reduction time, potential difference and ionic concentration flow rate have been investigated on the electrolytic recovery of silver from artificial photographic wastewater in continuous flow reactor system. As the initial concentration of silver ion and applied potential were increased, the amount of silver recovered was observed to be raised. Also, the electrolytically recovered material from artificial wastewater was proved to be pure silver based on the qualitative analyses by EPMA and XRD.

Silver recovery from photographic wastewater by electrowinning process with electrolyte recirculation (실제(實際) 사진폐액(寫眞廢液)의 순환(循環) 전해채취(電解採取) 공정(工程)에 의한 은(銀)의 환원(還元) 특성(特性))

  • Chung, Won-Ju;Kim, Dong-Su
    • Journal of the Korean Institute of Resources Recycling
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    • v.16 no.1
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    • pp.54-58
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    • 2007
  • In the continuous flow reductive treatment for recovery of silver from actual photographic wastewater, the effects of electrolysis time, applied potential, and the concentration of silver ion on the process have been examined. The efficiency of silver recovery for diluted photographic wastewater was increased with applied potential and reached its maximum at 6 V. However, the recovery of silver was shown to be decreased with potential above this. When the wastewater was undiluted, the efficiency of silver recovery was observed to rise as the applied potential became lower under the experimental conditions.