• Title/Summary/Keyword: light qualities

검색결과 129건 처리시간 0.031초

하천에 함유된 부유입자의 특성에 관한 연구 (A Study on Characteristics of Suspended Particles in the River)

  • 문병헌;서규태;장덕준
    • 한국물환경학회지
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    • 제21권5호
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    • pp.500-504
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    • 2005
  • Water samples were collected at 7 sites located along the River Nakdong on 30 occasions. Water qualities, size and fractal dimension ($d_F$) of suspended particles were measured. Laser light scattering method was used to obtain the size and $d_F$ of suspended particles. The average size of particles in this river ranged from $89{\mu}m$ and $169{\mu}m$, which appears to be relatively coarse compared with other rivers worldwide. The average $d_F$ of suspended particles in this study ranged from 1.8 to 1.9. The correlation analysis showed that DO, TN, $NO_3$ and chlorophyll-${\alpha}$ had significant positive relationships with particles size, whereas flow rates and TSS had negative relationships. Interestingly, the factors of which had positive relationships with particles size showed negative relationship with the fractal dimension ($d_F$) of suspended particles. Generally, as the size of particles increased, the fractal dimension of particles decreased which was indicating the shape of the larger particles became more irregular.

국내 한약재의 유통상 품질 문제점과 포장표준화를 통한 대응방안 고찰 (A Review on Quality Control of Korean Medicinal Herbs Through Packaging Standardization)

  • 가진동;김재능;박수일;이윤석
    • 한국포장학회지
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    • 제13권2호
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    • pp.43-50
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    • 2007
  • The production, distribution, and consumption of Korean medicinal herbs have increased every year because of an increase of health considerations. But there are no sufficient standardization procedures in packaging and distribution systems related to these herb products. The standardization of packaging material and dimension could be a good addition for establishing proper quality control methods for Korean medicinal herbs. Medicinal herbs deteriorate under physical, chemical and biological hazards such as oxidation, textural change under high moisture content, color change by light, sanitation problems by insect invasion and contamination. Packaging standardization with proper functional packaging materials is critical to ensure the qualities of medicinal herbs. Also, storage and distribution efficiencies can be improved by achieving packaging dimension standardization. This review summarizes recent research trends related to quality evaluation methods and major quality deterioration factors of Korean medicinal herbs. This paper also offers reviews on some of problems and challenges in current packaging and distribution systems of medicinal herb industries and briefly suggests advanced quality control methods through packaging standardization.

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루이스 바라간 건축의 색채사용 특성에 관한 연구 (A Study on the Characteristic of Color use Scheme in Luis Barragan's Architecture)

  • 유연숙
    • 한국가구학회지
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    • 제24권4호
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    • pp.416-425
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    • 2013
  • Luis Barragan's Architecture has creative feature that Mexican environment and traditional culture were complete by color. Thus the color of his work makes our emotions rich and colorful. He said "My architecture is autobiographical..." at speech in Pritz price. As we can see in his architectural philosophy that sentimental architecture is important than theorical system, his works are impression of empirical factor with intuition. "Color is a complement to the architecture. It serve to enlarge or reduce a space. It's also useful for adding that touch of magic a place needs", stated Barragan. During his process of shaping space, Barragan drew on color in the same way as an architectural component, according it a spatial funtion and expressive vale. he allied it with light, deeming it a crucial vehical for conveying the emotive attributes a site. The capacity of color to express sensitivity and sensuality within an architecture space is liked to its psycho-physiological qualities. In this kind of view, color featyre in Barragan's work is one of the most important tools to realize sentimental architecture, not only is result of the Mexican regional color. As a result, make focus on analyzing various meaning of the color in Barragan's architecture like poetic and habitable structure.

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공초점현미경과 원자현미경을 이용한 가공된 시료 표면의 형상측정 (Analysis of a processed sample surface using SCM and AFM)

  • 배한성;김경호;문성욱;남기중;권남익;김종배
    • 한국정밀공학회지
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    • 제23권4호
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    • pp.52-59
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    • 2006
  • Surface qualities of a micro-processed sample with a pulse laser have been investigated by making use of scanning confocal microscope(SCM) and atomic force microscope(AFM). Samples are bump electrodes and ITO glass of LCD module used in a mobile phone and a wafer surface scribed by UV laser. A image of $140{\times}120{\mu}m^2$ is obtained within 1 second by SCM because scan speed of a x-axis and y-axis are 1kHz and 1Hz, respectively. AFM is able to correctly measure the hight and width of ITO, and scribing depth and width of a wafer with a resolution less than 300nm. However, the scan speed is slow and it is difficult to distinguish a surface composed of different kinds of materials. Results show that SCM is preferable to obtain a image of a sample composed of different kinds of material than AFM because the intensity of a reflected light from the surface is different for each material.

Ethics of Situated-ness, Sustainability and Ecology

  • Baek, Jin
    • Architectural research
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    • 제13권1호
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    • pp.11-16
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    • 2011
  • This article illuminates the relationship between the human being and the surrounding things by referring to the philosophy of Martin Heidegger and Maurice Merleau-Ponty. Criticizing our habitual approaches to apprehending 'what a thing is,' the two thinkers elucidate how 'what a thing is' can be understood only in conjunction with situations in the everyday and how humanity is joined with the qualities of the thing. In addition to the situated-ness of a thing, this article demonstrates the situated-ness of the human being, too, by referring to the notion of the horizon in the tradition of phenomenology. The last part of the paper discusses the basic premises of sustainability in reference to the situated-ness of both things and human beings. Framing natural things such as light as the alternative sources of energy propagandized in sustainability seems progressive. However, this attitude maintains fundamentally the same instrumental attitude we had towards nature, an attitude that has caused the current ecological crisis. By pointing this out, this article seeks to shape a ground for a broad spectrum of sustainability that embraces non-instrumental dimensions such as the practical, the ethical and the spiritual. This article also points out the limits of some of the currently available versions of ecology such as Shallow Ecology and Deep Ecology. In so doing, it seeks to lay out the parameters that any future version of sustainability and ecology needs to address.

화상처리에 의한 Gas Tungsten Arc 용접에서의 용융지폭제어에 관한 연구 (A Study of Weld Pool width Control in Gas Tungsten Arc Welding Using the Digital Image Processing)

  • 김동철;이세헌;엄기원
    • 대한기계학회논문집A
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    • 제20권9호
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    • pp.2760-2769
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    • 1996
  • The feedback control systems of welding process using visual information can improve weld qualities. However, it is very difficult to get the visual information of weld pool since the light intensity of welding arc is much stronger than that of the weld pool. To explore the possibility of extending the capability of automatic welding machines, a study of a closed loop controlled welding system consisted of a GTA welding machine, a vision system, a stepping motor system and a digital computer was undertaken. Particularly, in this system, a CCD camera with a long wavelength pass filter was used to get a better weld pool image. Subsequently, an image analysis technique has been developed to measure the weld pool width. Using this weld pool width measurement, a colsed loop control system adjusted welding speed to maintain a constant weld pool width.

Characterizing Yarn Thickness Variation by Correlograms

  • Huh You;Kim Jong S.;Kim Sung H.;Suh M. W.
    • Fibers and Polymers
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    • 제6권1호
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    • pp.66-71
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    • 2005
  • The surface evenness and texture are closely related with the irregularity of yam thickness. Besides, yam thickness variation has an important role to influence the yam performance and the textile process efficiency. Thus, the information not only on the yam thickness, but also on the short- term irregular characteristics that have not been known before is required for enhancing the qualities of textile products. This paper reports the results of a study about the yam thickness and its variation for various types of yam on the basis of a new measurement system applying a laser slit beam as a light source. The new method delivers effective information on the irregularity. The analysis of the measured signal confirms that the visual shade created by the yam doubling and twisting can be measured and the yam thickness characteristics can be represented by corre­lograms. Depending on yam types, correlograms have different shapes and can be approximated to an exponentially decaying function with or without fluctuating magnitude. In addition, the effective information on the yam irregularity can be influ­enced by the sampling length interval of the measuring device used for tests.

항균소재를 함유시킨 저밀도폴리에틸렌 필름에 의한 상추와 오이의 포장 (Packagng of Fresh Curled Lettuce and Cucumber by Using Low Density Polyethylene Films Impregnated with Antimicrobial Agents)

  • 이동선;안덕순;황용일;조성환
    • 한국식품영양과학회지
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    • 제27권4호
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    • pp.675-681
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    • 1998
  • Low density polyethlene(LDPE0 films of 50${\mu}{\textrm}{m}$ thickness were fabricated with addition of antimicrobial agents of Rheum palmatum extract, Coptis chinensis extract, sorbic acid and Ag-substitude inorganic zirconium matrix in 1% concentration. The films were compared in physical properties, tested in antimicrobial activity against some selected microorganisms on the agar plate medium and then applied for packaging fresh curled lettuce and cucumber to preserve their qualities. The films with Rheum palmatum extract, Coptis chinensis extract, and Ag-substituted inorganic zirconium matrix did not show any antimicrobial activity on the disk test against Escherichia coli, Staphylococcus aureus, Leuconostoc mesenteroides, Saccharomyces cerevisiae, Aspergillus niger, Aspergillus oryzae, Penicilluium chrysogenum, while film with sorbic acid did against E. coli, S. aureus and L. mesenteroides. The added antimicrobial agents changed the color and light transmittance of the films, but did not affect their mechanical tensile strength, heat shrinkage and wettability. For the packaged curled lettuce and cucumber stored at 5$^{\circ}C$ and 1$0^{\circ}C$, all the LDPE films impregnated with antimicrobial agents showed the reduced growth of total aerobic bacteria in the vegetables compared with control film without any additive until it reached the level around 108/g. They did not give any negative effect on other quality attributes during storage.

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항공 초분광 영상을 이용한 광화학반사지수 이용 가능성 평가: 그림자 영향 및 대체 밴드를 중심으로 (Evaluating Applicability of Photochemical Reflectance Index using Airborne-Based Hyperspectral Image: With Shadow Effect and Spectral Bands Characteristics)

  • 류재현;신정일;이창석;홍성욱;이양원;조재일
    • 대한원격탐사학회지
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    • 제33권5_1호
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    • pp.507-519
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    • 2017
  • 정규식생지수(NDVI, Normalized Difference Vegetation Index)는 생물량 및 $CO_2$ 흡수량 추정과 병충해 탐지 등 다양한 식생 모니터링 영역에서 활용되고 있다. 그러나, 생물량 탐지에 비해 상대적으로 식생의 생리적 상태 변화에 대한 민감도가 낮아 식생의 생리적 활성 및 스트레스를 파악에 한계가 있다. 최근 개발된 광학반사지수(PRI, Photochemical Reflectance Index)는 식생의 생리적 상태 탐지에 용이한 것으로 알려지고 있으며, 식생의 탄소 흡수량 조사를 위해 향후 발사될 해외의 지구관측위성들의 주요 산출물로 선정되는 등 활용도가 높아질 것으로 전망된다. 이에 다양한 이용에 앞서 광 스트레스에 민감한 PRI 특성을 고려하여 그림자 영향의 해석 방향을 제시하고, 현재 가용한 위성으로 PRI 산출이 가능한지 알아보기 위해 대체 밴드를 평가하였다. 항공 초분광 영상을 이용한 본 연구에서는 PRI값이 그림자 부분에서 광 스트레스의 감소로 인해 증가하였다. 그러나 그림자의 정도가 임계값(Shadow Index<25)을 넘어서면 PRI와 NDVI 모두의 자료 품질이 매우 낮아졌다. 또한, 문헌의 570.0 nm 대신 553.6 nm를 사용하여 산출한 PRI가 오리지널 PRI와 높은 상관관계를 보였으며, RED와 NIR 반사도를 이용하여 다중회귀분석을 수행하였을 때 더욱 향상된 결과를 보였다. 이러한 결과는 향후 식생탐지에서 활용도가 높아질 것으로 기대되는 PRI의 생리적인 의미를 이해하는데 도움이 될 것이다.

Effects of Corn Distiller's Dried Grains with Solubles on Production and Egg Quality in Laying Hens

  • Cheon, Y.J.;Lee, H.L.;Shin, M.H.;Jang, A.;Lee, S.K.;Lee, J.H.;Lee, B.D.;Son, C.K.
    • Asian-Australasian Journal of Animal Sciences
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    • 제21권9호
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    • pp.1318-1323
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    • 2008
  • Corn distiller's dried grains with solubles (DDGS) is a completely new feed ingredient in the Korean feed market. There is an ever increasing need for the Korean feed industry to import and make the best of it as a high protein and high energy feed ingredient. A layer feeding trial was conducted for 10 weeks to investigate the effects of addition of light-colored DDGS to layer diets on laying performance, egg qualities and yolk fatty acid composition. Also, the economics of using DDGS in the Korean situation was analyzed. Nine hundred Hy-line Brown layers, 24 weeks of age, were employed in a feeding trial consisting of four dietary treatments (0, 10, 15, and 20% DDGS), and five replicates per treatment. All experimental diets were prepared as iso-protein (17%) and iso-calorie (TMEn 2,780 kcal/kg). The use of DDGS up to 20% in layer diets did not exert any influence on feed intake, laying rate, total egg mass, mean egg weight and feed conversion ratio (p>0.05). The color and breaking strength of eggshell, as well as the albumin height and Haugh unit were not affected by the addition of DDGS up to 20% in the diet. The yolk color was significantly increased by DDGS supplementation (p<0.05). As the DDGS level increased, the oleic acid content decreased, and the linoleic acid increased (p<0.05) in egg yolk. The degree of saturation of yolk fatty acids was not affected by DDGS supplementation. The inclusion of light-colored DDGS up to 20% in layer diets resulted in a decrease of feed cost per kg without any undesirable effect on laying performance. In conclusion, the light-colored DDGS (L* 56.65) could be used up to 20% in layer diets without any harmful effect on laying performance, and possibly provide economic benefits to the Korean poultry industry.