• 한국산학기술학회논문지
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• 제10권7호
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• pp.1635-1641
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• 2009

하드코팅에 의해 광변색과 경성의 성질을 갖는 플라스틱 렌즈를 제조하고, 그것들의 광학적 성질과 표면 특성을 평가하였다. 무색 상태의 자외선 스펙트럼과 유색 상태의 가시광선 스펙트럼에서 광변색 효과를 관찰할 수 있었다. 광변색 렌즈의 가시광선 투과율은 무색 상태에서 83.44%(검정)에서 87.15%(청)였으며, 유색 상태에서 71.10%(적)에서 79.98%(황)이었다. 적색 광변색 렌즈는 다른 렌즈에 비해 광학 밀도(${\Delta}$OD)와 색차(${\Delta}$$E^{\ast}_\;{ab}$)가 컸다. 하드코팅을 적용한 광변색 렌즈는 부착성, 내온수성, 내약품성 및 표면 현상이 우수하였으며, 또한 경도와 내마모성은 무코팅 렌즈에 비하여 증가하였다. 따라서 이와 같은 코팅 시스템으로 광변색과 하드코팅 성질과 같은 기능성을 안경렌즈에 부여할 수 있었다.

• 한국산학기술학회논문지
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• 제10권8호
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• pp.2026-2031
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• 2009

대부분의 석조문화재는 외부 환경에 노출되어 있어 외관이 크게 변형되어졌고, 특히 최근의 산업화와 환경 오염물질의 영향으로 풍화가 가속화되고 있다. 해수에 신선한 화강암을 침수시켰을 때 암석 표면의 구성광물(Ca, K)은 대부분 신선한 화강암(fresh granite)보다 낮은 농도값을 나타내어 해수에 의한 풍화의 영향 정도를 확인할 수 있었다. 실험 전.후의 화강암의 물리적 특성 분석 결과, 강제 풍화시킨 시료의 밀도는 평균 $2.580-2.582 g/cm^3$으로 신선한 화강암(평균밀도는 $2.600 g/cm^3$)에 비해 약간 낮은 값을 보였다. 또한 강제풍화시킨 화강암의 흡수율은 $0.526{\sim}0.616%$로서 신선한 화강암에 비해 1.3-1.6배 정도 높게 나타났다. $TiO_2$ 광촉매를 화강암에 코팅한 후 산성용액과 해수에 의한 강제풍화시 흡수율과 밀도 변화가 많이 저감되어 석조문화재의 풍화를 예방하는 효과가 있을 것으로 나타났다.

• Archives of Plastic Surgery
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• 제37권4호
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• pp.465-468
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• 2010

Purpose: Soft tissue deformity and skin defect after tumor resection in the periorbital area can cause trouble in the function of eyelid as well as in the aspect of external appearance. Therefore, as cosidering reconstruction in periorbital area, detailed assessment of both functional and aesthetic property are required. thus, the purpose of this study is to examine an appropriate reconstruction through clinical cases. Methods: A 14-year-old girl with congenital giant hairy nevus on right periorbital area was selected. Her first visit to our plastic surgery outpatient clinic was on July 2006. Since then, she has undergone staged removal of lesions and reconstruction by various flap technique such as pedicled island flap, forehead galeal flap, paramedian forehead flap, cheek rotation & advancement flap. Results: In the case of this girl, most lesions were removed and replaced by normal skins. Although there was the difference of skin color after skin graft, such difference was not noticeable and section scar by skin flaps was slight. There was no obvious dysfunction in the eyelids and the girl and her parents were satisfied with results after the surgery. Conclusions: In the reconstruction of soft tissue defect or soft tissue deformity and contracture, it is required to choose appropriate reconstruction method, considering aesthetic and functional aspects depending on aesthetic unit sufficiently.

• 패션비즈니스
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• 제14권6호
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• pp.39-52
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• 2010

Interests in creating three-dimensionally designed fabric materials are growing rapidly in the sectors of the fashionable textiles with the creativity, new functions, and aesthetics. A number of finishing methods have been developed and proposed to add or create new functions and designs for silk fabrics. Due to the strong hydrogen bonds between the molecules of silk fibroins, the thermal treatment methods used in thermoplastic fiber processing, which can easily deform the synthetic filament fabrics to endow three-dimensional appearance to the fabrics, are not applicable to the silk fabric treatment. In order to modify the fine structure of silk fiber, neutral salt solution treatment methods have been suggested. In this study, the effect of the calcium nitrate solution on the physical and mechanical properties of silk fabrics was investigated by using the KES(Kawabata Evaluation System) equipment. Based on these findings, relationships between parameters, for example, the thickness and the compressional energy, the thickness and the compressional linearity, and the air permeability and the pore area statistical analysis were investigated. The relationships between the process parameters such as treatment temperature/time and the resulting fabric property parameters were also analyzed by using several SAS procedures.

• Nuclear Engineering and Technology
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• 제34권2호
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• pp.146-153
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• 2002

To radiolabel bioactive molecules, we synthesized $^{99m}$Tc-tricarbonyl precursor, [$^{99m}$Tc(CO)$_3$($H_2O$)$_3$]$^{+}$ with a low oxidation state ( I ). The [$^{99m}$Tc(CO)$_3$($H_2O$)$_3$]$^{+}$ was prepared by low pressure carbonylation (1 atm of CO) of [$^{99m}$Tc $O_4$)]$^{[-10]}$ in the presence of NaB $H_4$ resulting in higher than 98% of labeling yield and stability up to 8 hrs. We evaluated the characteristics of $^{99m}$Tc- tricarbonyl labeled bioactive molecules by carrying out in vitro and in vitro study. Prepared [$^{99m}$Tc(CO)$_3$($H_2O$)$_3$]$^{+}$ was then reacted with some ligands of significance in modem diagnostic nuclear medicine and some amino acids. Labeling yields were checked by HPLC and found to be usually high, excluding $^{99m}$Tc-tricarbonyl-MDP, -EDTMP and -mIBG. And the biodistribution properties of $^{99m}$Tc-tricarbonyl complexes applied in rabbit showed different appearance comparing with that of the $^{99m}$Tc-labeling by conventional means. From these results, we conclude that [$^{99m}$Tc(CO)$_3$($H_2O$)$_3$]$^{+}$ is a potential precursor for development of radiopharmaceuticals, especially for labeling of biomolecules.

• Journal of the Optical Society of Korea
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• 제17권4호
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• pp.344-349
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• 2013

This paper proposes a simulation algorithm to assess the gradual yellowing vision of the elderly, which refers to the predominance of yellowness in their vision due to aging of the ocular optic media. This algorithm employed the spectral transmittance property of a yellow filter to represent the color appearance perceived by elderly people with yellow vision, and modeled the changes in the color space through a spectrum change in light using the yellow filter effect. The spectral reflectivity data of 1269 Munsell matte color chips were used as reference data. Under the standard conditions of a D65 illuminant and a $10^{\circ}$ observer of 1964 CIE, the spectrum of the 1269 Munsell colors were processed through the yellow filter effect to simulate yellow vision. Various degrees of yellow vision were modeled according to the transmittance percentage of the yellow filter. The color differences before and after the yellow filter effect were calculated using the DE2000 formula, and the color pairs were selected based on the color difference function. These color pairs are distinguishable through normal vision, but the color difference diminishes as the degree of yellow vision increases. Assuming 80% of yellow vision effect, 17 color pairs out of $(1269{\times}1268)/2$ pairs were selected, and for the 90% of yellow vision effect, only 3 color pairs were selected. The result of this study can be utilized for the diagnosis system of gradual yellow vision, making various types of test charts with selected color pairs.

• 대한건축학회논문집:계획계
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• 제35권9호
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• pp.89-99
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• 2019

In the representation of buildings with continuous changes in the curved shape of the surface, countless plans or sections are required, or none of the traditional drawings can explain the geometry of it. In other words, in no case can an ordinary drawing achieve the efficient and clear communication capability which is inherent function of the drawings. As a result, the current architects are introducing their own way of drawing technique which is developed in accordance with a specific curved shape, construction method or company resources, but this is not what can be applied to other cases because it has not been ever shared or agreed in the industry. In this process, the drawing or construction of curved building has been recognized as the exclusive property of a specific expert, or the design and construction without the in-depth understanding of the technology have resulted in the appearance of poor buildings. Therefore, this study aims to present an elements and method that can convey shape information more effectively and clearly in the drawing representation of non-linear buildings and, thus, contributes to lowering the barriers to entry into the field by providing the information to be easily applied to related projects. In order to attain this goal, the drawings of recently completed projects of free form building are analyzed to reveal the method used to effectively express the shape information of the building and to derive new drawing elements that have not been applied to the existing drawings.

• Smart Structures and Systems
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• 제29권2호
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• pp.267-278
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• 2022

Pre-stressed concrete circular spun piles are widely used in various infrastructure projects around the world and offer an economical deep foundation system with consistent and superior quality compared to cast in-situ and other concrete piles. Conventional methods for measuring the lateral response of piles have been limited to conventional instrumentation, such as electrical based gauges and pressure transducers. The problem with existing technology is that the sensors are not able to assist in recording the lateral stiffness changes of the pile which varies along the length depending on the distribution of the flexural moments and appearance of tensile cracks. This paper describes a full-scale bending test of a 1-m diameter spun pile of 30 m long and instrumented using advanced fibre optic distributed sensor, known as Brillouin Optical Time Domain Analysis (BOTDA). Optical fibre sensors were embedded inside the concrete during the manufacturing stage and attached on the concrete surface in order to measure the pile's full-length flexural behaviour under the prescribed serviceability and ultimate limit state. The relationship between moments-deflections and bending moments-curvatures are examined with respect to the lateral forces. Tensile cracks were measured and compared with the peak strains observed from BOTDA data which corroborated very well. By analysing the moment-curvature response of the pile, the structure can be represented by two bending stiffness parameters, namely the pre-yield (EI) and post-yield (EI_cr), where the cracks reduce the stiffness property by 89%. The pile deflection profile can be attained from optical fibre data through closed-form solutions, which generally matched with the displacements recorded by Linear Voltage Displacement Transducers (LVDTs).

• 한국의류학회지
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• 제45권6호
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• pp.978-985
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• 2021

This study aims to propose a prediction model for the drape coefficient using artificial neural networks and to analyze the nonlinear relationship between the drape properties and physical properties of fabrics. The study validates the significance of each factor affecting the fabric drape through multiple linear regression analysis with a sample size of 573. The analysis constructs a model with an adjusted R² of 77.6%. Seven main factors affect the drape coefficient: Grammage, extruded length values for warp and weft (m_warp, m_weft), coefficients of quadratic terms in the tensile-force quadratic graph in the warp, weft, and bias directions (c_warp, c_weft, c_bias), and force required for 1% tension in the warp direction (f_warp). Finally, an artificial neural network was created using seven selected factors. The performance was examined by increasing the number of hidden neurons, and the most suitable number of hidden neurons was found to be 8. The mean squared error was .052, and the correlation coefficient was .863, confirming a satisfactory model. The developed artificial neural network model can be used for engineering and high-quality clothing design. It is expected to provide essential data for clothing appearance, such as the fabric drape.

• Fisheries and Aquatic Sciences
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• 제26권2호
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• pp.145-157
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• 2023

Surimi has been traditionally used as the main ingredient in gelling foods, such as imitation crab sticks. However, it can also be used to manufacture snacks without gelling properties. To assess the properties of surimi as a snack ingredient, we prepared fried fish snacks with different surimi grades of Alaska pollack (AP) and threadfin bream (TB) and evaluated their quality characteristics. AP had significantly higher protein and gel strength values than TB did. Regarding color, TB showed significantly lower lightness (L) values and higher redness (a) and yellowness (b) values than AP did, consistent with the appearance of a brown color. TB had significantly lower hardness values, higher thickness expansion, and higher oil content than AP did. Hardness was found to be positively correlated with gel strength and negatively correlated with oil content. In the micro-structure images, more blistering was formed in TB, indicating higher expansion and crispiness. In the sensory evaluation, TB showed higher overall sensory acceptance than AP did, which is the result of its high color content, crispiness, taste, and aroma. Principal component analysis of the electronic nose and tongue revealed that the samples were clearly separated. In particular, TB had more aromatic components than AP in the electronic tongue. Our findings indicate that gel strength, which determines the quality properties of surimi, does not need to be considered in snack manufacturing. In fact, surimi with low gel strength is a more suitable ingredient for snack manufacturing.