• Korean Journal of Fisheries and Aquatic Sciences
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• v.46 no.5
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• pp.571-574
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• 2013

To determine an efficient growth system for algal cultivation and to develop adequate culture system utilizing LED light, we investigated the effects of fluorescent and light emitting diode (LED) light source on the growth of Ulva pertusa. U. pertusa was cultured at $17^{\circ}C$ under a light intensity of 35 ${\mu}mol$ photons $m^{-2}s^{-1}$ and a 10L:14D photoperiod using either fluorescent or LED lamps. After 1 week of incubation under the same environmental condition, the length and width of Ulva pertusa grown under LED light were 1.5- and 1.9-fold greater, respectively, than the length and width of algae grown under fluorescent light. After two weeks, length and width were 2.6- and 2.0-fold greater, respectively, in algae grown under LED light. Total length and width of Ulva pertusa after three weeks of incubation were 1.7- and 1.2-fold greater in algae grown under LED light than those grown under fluorescent light. Therefore, the LED light induced significantly higher growth of Ulva pertusa than fluorescent light.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.15 no.3
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• pp.10-17
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• 2001

We need to how about activity types, lighting conditions and physical features in a plate that is a object for the reasonable and economic lighting design. Thus, lighting designer analyzes spare features and completes lighting design by using luminaire that has a suitable luminous intensity distribution. There are special data in this study from analysing about activity types, lighting conditions and physical features of intelligent buildings that are getting an essential infrastructure in the information society. Intelligent building could be classified with office space, passing space, high ceiling space, one-side working space for the analysis. Also, four luminous intensity distributions and fluorescent fixtures, which are the mutt used luminaires in office building, are designed from the data of intelligent building.

• Applied Chemistry for Engineering
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• v.22 no.5
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• pp.579-581
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• 2011

Spectroscopic evaluation of hair chemical damage was performed by SEM/EDS, CLSM, and FT-IR spectroscopy. In SEM/EDS, hydrogen peroxide treated hair showed the loose packing of surface scales, lower ratio of sulfur element and higher ratio of oxygen atom. In the optical single section by using CLSM, high fluorescent intensity appeared in untreated hair. However, in case of treated hair, low fluorescent intensity appeared. This results the aromatic amino acids which can be autofluorescent were more abundant than bleached hair. FT-IR spectra showed that cysteic acid band intensity was increased by performing the bleaching treatments. These results indicate that the oxidative damage cleaves the S-S bond and results in the lower working force of hair fiber.

• Macromolecular Research
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• v.12 no.3
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• pp.282-289
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• 2004

We have extensively characterized the fluorescence behavior of unsaturated polyester (UP) resin in the absence and presence of a 1,3-bis-(l-pyrenyl)propane (BPP) fluorescent probe at various dynamic and isothermal cure histories by means of a steady-state fluorescence technique using a front-face illumination equipment. In addition, we explored the effect of the fluorescence intensity on the relaxation of the fluorescent probe in the UP resin by resting the dynamically and isothermally cured resin at ambient temperature and pressure for 24 h. The monomer fluorescence intensity, which has two characteristic peaks at 376 and 396nm, changed noticeably depending on the cure temperature and time and provided important information with respect to the molecular and photophysical responses upon curing. The result of the fluorescence study indicates that the increased local viscosity and restricted molecular mobility of the UP resin surrounding the BPP probe after curing are both responsible for the enhancement of the monomer fluorescence intensity. Our results also demonstrate that once the BPP probe has enough time to rearrange and become isolated prior to fluorescence, a sufficient amount of fluorescence is emitted. Therefore, we note that the fluorescence behavior of this UP resin system is influenced strongly by the relaxation process of the fluorescent probe in the resin as well as process used to cure the resin.

• Korean Chemical Engineering Research
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• v.56 no.6
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• pp.826-831
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• 2018

This study presents fabrication of bi-compartmental particles labeled by multiple fluorescence. To compartmentalize fluorescent expression at the particle, two fluorescent dyes with less overlap of the excitation and emission spectra are selected. To ensure the fluorescence stability, the fluorescent dyes contain acrylate functional groups in the molecules so that they can be cross-linked together with monomers constituting the particle. Strong fluorescent expression and compartmentalization were observed at the particle fabricated using the selected fluorescent dyes through confocal microscopy. Furthermore, long-term fluorescence stability was verified by measuring fluorescent expression and intensity for 4 weeks. We anticipate that the bi-compartmental particles labeled by multiple fluorescence can be widely used for multi-target drug delivery system, analysis of 3 dimensional Brownian motion, and investigation of 3 dimensional complex self-assembled morphologies.

• Journal of Mushroom
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• v.12 no.4
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• pp.270-274
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• 2014

In previous studies, we selected the green LED(light emitting diodes) for suitable wavelength of the light by higher commercial yields and lower ratio of the abnormal fruit body in Lentinula edodes. In this study, we aimed to select efficient irradiation intensity of the green LED. Stronger irradiation intensity of the green LED resulted in more polyphenol content of fruit body. And Polyphenol content of fluorescent lamp was similar to that of the green LED $20umol{\cdot}m^{-2}{\cdot}s^{-1}$.. Ergosterol content of the green LED $5umol{\cdot}m^{-2}{\cdot}s^{-1}$ was showed higher 2.1 times than that of the fluorescent lamp. In four level of irradiation intensity, 5, 10, 15, $20umol{\cdot}m^{-2}{\cdot}s^{-1}$ there was no big difference in characteristics of the fruit body. However the yield of fruit body in the green LED $5umol{\cdot}m^{-2}{\cdot}s^{-1}$ is higher than the others. In addition, The amount of electricity used of the green LED $5umol{\cdot}m^{-2}{\cdot}s^{-1}$ was reduced 15.9% than that of the fluorescent lamp. In conclusion, we selected $5umol{\cdot}m^{-2}{\cdot}s^{-1}$ for suitable irradiation intensity in Lentinula edodes with sawdust substrate cultivation.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2007.11a
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• pp.179-182
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• 2007

Recently, the circuits of fluorescent light-switches are separated for window-light, middle-lights, or corridor-light, etc in most offices and classrooms in this country. Although it is clean and shiny - more than standard intensity of illumination, it is common that fluorescent lights on the side of window are lighted. In this case, we can use a fluorescent light with a sensor, which is turned on and off automatically according to the amount of sunlight. I think that this plan can save energy, reduce the budget, and increase the effect of education. and so I studied on this plan.

• Journal of Biosystems Engineering
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• v.37 no.3
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• pp.209-213
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• 2012

Purpose: This study was performed to develop a simple, disposable thin-film optical nitrate sensor. Methods: The sensor was fabricated by applying a nitrate-selective polymer membrane on the surface of a thin polyester film. The membrane was composed of polyvinylchloride (PVC), plasticizer, fluorescent dye, and nitrate-selective ionophore. Fluorescence intensity of the sensor increased on contact with a nitrate solution. The fluorescence response of the optical nitrate sensor was measured with a commercial fluorospectrometer. Results: The optical sensor exhibited linear response over four concentration decades. Conclusions: Nitrate ion concentrations in plant nutrient solutions can be determined by direct optical measurements without any conditioning before measurements.

• Proceedings of the KOSOMBE Conference
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• v.1990 no.05
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• pp.67-71
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• 1990

This paper is dedicated to a research on fluorescent temperature-sensor system, which analyses the characteristic of fluorescent material and observes the relation between temperature and time delay of reflected beam from red light through experiment. From the experiment, We know that the reflected be am from flourescent material has some time delay. The intensity of reflected beam is inversly proportional to the temperature around the material.

• Proceedings of the KSME Conference
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• 2008.11b
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• pp.2415-2418
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• 2008

Polydiacetylenes (PDAs) are very attractive chemical substances which have distinctive features of color change and fluorescence emission by thermal or chemical stress. Especially, when PDAs contact with solutions of a particular pH, such as a strong alkaline sodium hydroxide (NaOH) solution or a strong acidic hydrogen chloride (HCl) solution, PDAs change their color from non-fluorescent blue to fluorescent red. In this study, we propose a novel method to detect alkaline pH using PDAs and NaOH solutions by hydrodynamic focusing on a microfluidic chip. Preliminary results indicate that the fluorescent intensity of PDAs increases in respond to the NaOH solution concentrations. Also, the fluorescence is quenched back when the PDAs are in contact with a HCl solution. These results are useful in a microfluidic PDA sensor chip design for pH detection.