• Bulletin of the Korean Chemical Society
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• v.31 no.12
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• pp.3866-3869
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• 2010

• Bulletin of the Korean Chemical Society
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• v.30 no.3
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• pp.731-734
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• 2009

• Journal of Korean Ophthalmic Optics Society
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• v.14 no.4
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• pp.19-26
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• 2009

Purpose: This study was to notify improvements needed in Cultural studies and Basic subjects to make Ophthalmic optic major curriculum qualitatively better, based on demand for cultural studies and basic subjects on and off the campus. Methods: A survey with questionnaires were carried out for both students and opticians in different provinces. For students, Gyunggi province, Gyunman province, Jeonnam province, and Jeonbuk province, and for opticians Seoul, Daejeon, Gyunggi province, and Jeonbuk province were selected. Results: Students' demand for expanding English courses in Foreign language curriculum was the highest and had significant difference between 2-years college and 3 or 4-years college ( p<.01), and opticians' demand differed from 2-years college and 3-years college ( p<.05). Students' demand for expanding Biology courses in science curriculum was the highest, and also a difference in expansion demands for Biology and physics subjects between 2-years college and 4-years college ( p<.05). There was also a difference in expansion demands for Vocational ethics and Management subjects in Basic subjects between 2-years college and 4-years college ( p<.05), and for Vocational ethic subject demands between college students and opticians ( p<.001), but for Management subject, both students and opticians demanded it to be expanded highly. Conclusions: Expansion and reinforcement in Management subject in Ophthalmic optic major was needed, as both Ophthalmic optic major students and opticians had the highest demand for this subject.

• Applied Microscopy
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• v.37 no.3
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• pp.199-208
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• 2007

We have made an optical device to study the wave optics phenomena, such as image and diffraction pattern, constructive and destructive interference, by direct operation of laser beam and optical lenses. It consists of laser beam, goniometer, objective lens, intermediate lens, projection lens, CCD system, and computing system. As a result of the performance test, we were able to magnify samples up to 44 times with the resolution of about $5{\mu}m$. It is expected to help EM users understanding more easily principles of transmission electron microscopy (TEM).

• Journal of Korean Ophthalmic Optics Society
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• v.9 no.1
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• pp.117-124
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• 2004

In this paper, we took the clinical data of Korean eyes and designed the schematic eye with the same optical properties of the real eye. In the design process, we took the clinical emmetorpia data of young Korean adults collected in the past and analyzed to get a basic specification of the real eye for the design of schematic eye. The purpose of design was for the schematic eye to have the same optical properties of real eye in spherical aberration and astigmatism.

• Journal of Korean Ophthalmic Optics Society
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• v.10 no.4
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• pp.305-312
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• 2005

In this thesis, Lohmann's algorithm and FFT (fast Fourier transform) are used to synthesize binary-phase holograms. FFT computing is carried out for the calculation of complex wavefronts of $128{\times}128$ sampling points of an object that is numerically specified. Then using the Lohmann's algorithm, the amplitude and the phase of complex wavefronts are encoded in binary holograms on each sampling points. PC (personal computer) and laser printer are used to plot binary-phase holograms and CGH (computer generated holograms) films are obtained from this plot by photographic reduction. Holographic images of numerically specified objects are reconstructed from the He-Ne laser and the inverse Fourier optics system. We estimate the quality of holographic images according to the sampling number, application of random phase, amplitude clipping and bleaching the CGH film. We derive optimized conditions to reconstruct better holographic images and to reduce the speckle noise. FFT and Lohmann's algorithm are implemented with MS Visual BASIC 6.0 for the programming of binary-phase hologram.

• Korean Journal of Optics and Photonics
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• v.17 no.5
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• pp.412-419
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• 2006

We design and fabricate an autostigmatic null lens system assembled in a fixed tube mount in order to evaluate the shape of an aluminum hyperbolic mirror with the diameter of 300 mm and the f-number of 1.98, which is fabricated by a high precision aspherical DTM (diamond turning machine). Also, we evaluate the degree of shape of the aspherical mirror by this autostigmatic null lens testing method. The autostigmatic null lens system assembling in a fixed tube mount has several advantages of light weight, good mechanical stability, etc. The permissible fabricating limits of null lenses and a mount are determined by considering various tolerances to assure the measurement reliability.

• Journal of Korean Ophthalmic Optics Society
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• v.8 no.2
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• pp.31-35
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• 2003

Several poly(6-dialkylamino-1,3,5-triazine-2,4-dithioxylene) derivatives were synthesized by the polycondensation of 6-dialkylamino-1,3,5-triazine-2.4-dithiol with m- and p-dibromide xylene in a cetyltrimethyl ammonium bromide at $70^{\circ}C$ for 24h. The synthesized derivatives had refractive Indexes of 1.580~1.697 and had molar absorptivity of 97~196.6. In these derivatives, we knew that they are a polymer having high refraction indexes without double refraction because they contain triazine rings and sulfur atoms with high electron density.

• Journal of Korean Ophthalmic Optics Society
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• v.12 no.4
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• pp.83-86
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• 2007

In this study, a program has been developed to enable a simulation of spherical aberration - originated from a spherical surface and an aspheric surface - via ray tracing and calculation of the degree of spherical aberration. This process has been verified for the variation of spherical aberration generated from ray tracing for aspheric surfaces such as an oval, a parabola, and a hyperbola. By comparing it with the spherical surface, the principle and necessity of the aspheric surface lens design have been understood. In addition, it allows confirming the accuracy of the simulation by developing a ray tracing program in relation to the mirror plane of a parabola.

• Journal of Korean Ophthalmic Optics Society
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• v.8 no.2
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• pp.25-29
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• 2003

Nickel-ferrite $Ni_xFe_{3-x}O_4$ thin films with several composition for Ni on glass substrate was prepared by ferrite plating method in order to make sunglass which cut off ultraviolet and shield electromagnetic field. It has single phase of polycrystalline spinel structure and has gloss as mirror and has high hardness which is no scratch while scraping by using nail. The transmittance of nickel-ferrite thin film is lowered to zero below 400 nm manifestly. And it shows that the nickel-ferrite thin film in nickel composition rate x = 0.09 was most cut oil ultraviolet when compared with goods of other company in the cut off effect of ultraviolet. Therefore, sunglasses coated with $Ni_xFe_{3-x}O_4$ thin film can be used in removing ultraviolet and electromagnetic field.