• 대한치과보철학회지
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• 제39권3호
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• pp.313-318
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• 2001

Masticatory function is more important than esthetics in posterior fixed restoration. The usual technique-mounting the casts on a semi-adjustable articulator, etc. -cannot make all patients satisfied with their restorations. For example, functionally generated path technique can be an easier and more satisfactory method in the restoration of group function. These clinical reports describe various approaches for occlusal restoration of relatively simple posterior fixed protheses according to patients occlusal patterns. The 3-unit bridge restoration is one of the most popular treatment options in prosthodontics. Because dentists have much experiences of it, they restore a missing span of one tooth mechanically, that is, without special consideration. While esthetics is important in making an anterior 3-unit fixed prostheses, mastication is more focused on in posterior 3-unit bridge restoration. Many dentists are concerned about various aspects in esthetics, such as morphology of the tooth, value, chroma, hue, translucency, surface texture, etc. But they do not usually consider various methods to restore occlusion. They treat one-tooth-missing area in a similar way in spite of patients having variety of occlusal patterns. Three cases are presented here in 3 or 4-unit bridge restoration. They show some methods to restore patients' occlusal patterns.

• 대한치과보철학회지
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• 제27권1호
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• pp.123-141
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• 1989

The purpose of this study was to investigate the tendency of color change of ceramic, and its mechanism un der the influence of Pd-Ag alloy. The specimens were made by firing porcelain on tile metal plates cast with Au-Pt alloy, Pd-Cu alloy and Pd-Ag alloy. In the case of Pd-Ag alloy, specimens were fired under three different conditions as follows, 1) without protection, 2) protection with ceramic metal conditioner, 3) protection with carbon block. For the specimens of element analysis, a barrier was constructed with platinum foil between metal plate and ceramic. Color change was measured with colorimeter and elemental changes in ceramic were calculated with DC argon plasma emission spectrophotometer. The results were as follows : 1. Color change of ceramic by Pd-Ag alloy was negligible in hue, but decreased in value and increased in chroma (yellow discoloration). 2. Color change of ceramic by Pd-Ag alloy was appeared through vapor transport mechanism. 3. As the protection method for the color change of ceramic by Pd-Ag alloy, application of ceramic metal conditioner was superior to utilization of carbon block.

• 한국한의학연구원논문집
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• 제8권1호
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• pp.105-108
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• 2002

To obtain a specific pharamcological effect, herbal medicines are processed based on the principle of traditional korean medicines. The problem in drug processing is the variety of methods, technics, and drug quality. In order to establish the base of standardization of processing methods, some herbal medicines(Evodiae Fructus, Scutellariae Radix, Astragali Radix, Zingiberis Rhizoma, Dioscoreae Radix, Aconiti Radix) were processed and studied the change a color tone of processed and unprocessed herbal medicines. The color tone(value and chroma) of these herbal medicines were changed after processing.

• 한국의류학회지
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• 제35권12호
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• pp.1507-1517
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• 2011

Berberine, palmatine, and Phellodendron bark dye was prepared in methanol for HPLC-DAD-MS analysis of liquid dye. Silk was dyed using berberine, palmatine, and Phellodendron bark dye prepared in water. The dye was extracted from the dyed silk using the HCl/methanol/water (2:1:1 v/v/v) solvent system with a slight modification. The liquid dyes and the dye extracted from the silk samples dyed with the three dye sources were examined using the HPLC-DAD-MS analysis to simultaneously detect berberine and palmatine from the plant dye and the dyeings. Colorimetric measurement was carried out using a spectrophotometer to examine the color and the intensities of berberine, palmatine, and Phellodendron bark dyed silk samples. From the liquid dyes, berberine eluted at 5.21 min with the molecular cation m/z=336 and the UV spectrum confirming that the product was berberine. Palmatine eluted at 5.12 min with the molecular cation m/z=352 and the UV spectrum confirming that the product was palmatine. From the silk dyed with berberine and palmatine dye, berberine and palmatine species eluted at 5.35 min and 5.24 min, respectively. From the silk dyed with Phellodendron bark, berberine and palmatine were detected simultaneously at 5.35 min and 5.26 min, respectively. All three dyes had yellow hue while palmatine dyed silk showed the highest hue and chroma. Palmatine dyed silk showed the highest K/S value that indicated the strongest color intensity and the highest dye uptake.

• 한국실내디자인학회논문집
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• 제21권5호
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• pp.135-144
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• 2012

Since Seoul was selected as the world design capital at the end of 2007, the endeavors to modernize the Korean unique beauty is becoming more tangible. Especially, the commercial spaces to be used by the general public and tourists have the value for study in the respect that such spaces for the national iconic images and have a large and far-reaching effect to transmit the national identity. Therefore, this study analyzed the design coordination properties in the Koreanity expression found in the modern commercial spaces. the foundation for the analysis was based on Leonard Koren's work on the arrrangement rhetoric theory, 'Arranging things(2003), and the contents of Korean expression were reviewed with professional jounals. the results are as follows: First, the design coordination properties in the Koreanity expression shown in modern commercial spaces are black-white contrast, natural materials, curved shapes, brevity, and simple beauty. Especially, some elements such as wood, traditional Korean papers, stones, mid-to-low chroma natural colors, checked patterns, and crazy patterns are used with overlapping and it is viewed that it is necessay to more aggressively seek for the disappeared traditional elements in the Korean modeling properties. Second, the concrete images of Korean expressions could be summarized as four adjective image groups, Natural, Subtitle, Gentle and Magnificent.

• 한국염색가공학회지
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• 제2권1호
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• pp.8-13
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• 1990

The fading of dyed material by light has long been subject of investigation, yet surprisingly little is known of the fundamental photochemical reactions, because of mainly the complex nature of dye-fibre system. The effect of the chemical structure of dye on lightfastness has been mostly studied when there is substituents on the place satisfied Hammett rule. Therefore, in this investigation the effectiveness of chemical structures of Congo Red and Benzopurpurine 4B unsatisfied Hammett rule on dyeing property and lightfastness of cotton was studied. The results obtained from this study were as follows; 1. Highly polar solvents showed hypsochromic shift. 2. Adsorption isotherm curves of the two dyes were Freundlich type. And Congo Red showed good dyeing property in comparision with Benzopurpurine 4B. 3. The type of the FR curve of the two dyes was first-ordr curve. And the CF curves of the two dyes showed normal fading state during irradiation. 4. During irradiation, the Hue was changed on the part of yellowish. The Value was increasing and the Chroma was decreasing. 5. Benzopurpurine 4B showed good lightfastness in comparision with Congo Red.

• 한국분말재료학회지
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• 제28권1호
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• pp.38-43
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• 2021

A high NIR-reflective black pigment is developed by Mn doping of Fe2O3. The pigment powders are prepared by spray pyrolysis, and the effect of the Mn concentration on the blackness and optical properties is investigated. Mn doping into the crystal lattice of α-Fe2O3 is found to effectively change the powder color from red to black, lowering the NIR reflectance compared to that of pure Fe2O3. The pigment doped with 10% Mn, i.e., Fe1.8Mn0.2O3, exhibits a black color with an optical bandgap of 1.3 eV and a Chroma value of 1.14. The NIR reflectance of the prepared Fe1.8Mn0.2O3 black pigment is 2.2 times higher than that of commercially available carbon black, and this material is proven to effectively work as a cool pigment in a temperature rise experiment under near-infrared illumination.

• 전기전자학회논문지
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• 제13권4호
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• pp.116-124
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• 2009

근래 휴대 단말기용 모뎀 칩셋이나 멀티미디어 프로세서의 CPU성능은 노트북PC에 버금가는 수준으로 향상되면서 휴대단말기가 전자기기의 컨버전스화를 주도하는 아이콘으로 떠오르고 있다. 더불어 DMB, 디지털 카메라, 화상통화, 인터넷 검색 등이 기본적으로 제공되면서 소형크기의 휴대 단말기용 디스플레이에서도 화질에 대한 관심이 높아지고 있다. 휴대단말기의 경우 야외에서 태양광과 같은 주변광원의 변화로 동일한 영상이 열화 또는 과도하게 밝아져 보이는 야외 시인성 문제를 해결해야 하며, 더구나 최근 터치방식 패널이 휴대단말기 디스플레이 장치에 사용되면서 ITO 필름에 의한 투과율 손실로 디스플레이 화면의 컨트라스트 저하가 더해지고 있다. 본 논문에서는 휴대 단말기용 영상개선 SoC를 위해 영상 개선 알고리즘을 개발하였고 이에 대한 성능 비교를 수행하였다. 컨트라스트 개선을 위해 적응형 기법으로 Clipped Histogram Stretching을, 정적 기법으로 S형 곡선조정과 Gain 조정 기법을 사용하였고 야외 시인성 개선을 위해서는 CIELCh 색공간에서 외부 조도센서의 정보에 따라 명도(Lightness)와 채도(Chroma)가 조절될 수 있도록 하였다. 개발한 알고리즘에 대한 성능평가는 결과영상의 히스토그램, RGB 화소값 분포도, 엔트로피 그리고 동적영역 확장비 등을 통해 분석을 진행하였다.

• Applied Biological Chemistry
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• 제36권2호
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• pp.115-120
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• 1993

국내산 토마토의 품종별 가공적성을 파악하기 위한 기초자료의 수집을 위하여 무지주재배 가공용 토마토 5품종과 가공 및 생식 겸용 지주재배 토마토 4품종에 대한 이화학적 특성을 비교한 결과는 다음과 같다. 토마토과실의 무게 및 최장길이, 폭, 두께 및 비중은 지주재배형 토마토품종이 무지주재배형 품종보다 더 큰 값을 보였으며 지주재배형 품종중에서는 Master 2가 가장 큰 값을 76Mo11-3-1-2-2가 가장 작은 값을 보였다. 무지주재배형 품종중의 무게, 최장길이, 폭 및 비중의 값을 비교하면 Jinhong이 가장 높았고 두께는 Good Hope가 가장 높았으며 $79078{\times}ARC$가 가장 낮았다. 경도는 무지주재배형 품종내에서만 유의적인 차이를 보였고 $79078{\times}ARC$가 가장 낮았다. 토마토의 Sphericity는 무지주재배형이 지주재배형보다 더 높았으며 무지주재배형에서는 Good Hope가 가장 높았다. 과색의 Dominant wavelength는 무지주재배형이 지주재배형보다 컸으며 무지주재배형에서는 Good Hope가 가장 컸다. Lightness, % chroma는 재배형간에 큰 차이가 없었다. 수분함량은 재배형간에 유의적인 차이가 없었으며 당은 일반적으로 지주재배형에서 높았고 Master 2가 가장 높게 나타났다. 산도는 무지주재배형 품종이 유의적으로 더 높았으며 Good Hope가 가장 높았다. pH와 Vitamin C 함량은 무지주재배에서는 $79078{\times}CL1561F6$가 가장 높았고 지주재배형에서는 76Mo11-3-1-2-2가 높았다.

• 한국축산식품학회지
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• 제40권4호
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• pp.601-612
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• 2020

The study assessed the stability for fresh beef patties with the inclusion of clove extract (CE) as a natural antioxidant in comparison to butylated hydroxytoluene (BHT) and ascorbic acid (AA) at frozen storage. Four different patties were made dependent on the added antioxidants: control (added no antioxidants), added with 0.02% BHT, 0.05% AA, and 0.1% CE. Inclusion of BHT, AA, and CE resulted in a significant reduction of thiobarbituric acid reactive substances (TBARS) and hue angle (h°) value and increase of redness (CIE a*) and chroma (C*) values (p<0.05). BHT, AA, and CE were observed effectively to retard lipid oxidation and increase color stability. BHT and AA revealed significantly (p<0.05) higher thiol content than the control and CE. However, the reduction percentage for thiol content in CE treated patties was lower than the control and AA-treated patties from first to last time of storage. Moreover, inclusion of AA and CE led to significantly (p<0.05) increased heme iron content when compared to BHT and the control. In conclusion, CE can replace the application of AA and BHT while improving lipid stability, heme iron content, and color stableness of fresh beef patties throughout frozen storage.