• Journal of Korean Ophthalmic Optics Society
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• v.15 no.1
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• pp.9-17
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• 2010

Purpose: We have studied the problems associated with increased number of ophthalmic optics students and its effects on the supply and demand of optician. Methods: We collected data from Education Statistics, a white paper of Minister for Health, Welfare and Family Affairs, academyinfo web site and University (College) web site. Results: We forecasted an estimate for supply and demand of optician using the entrance number of ophthalmic optics. Conclusions: The numbers of produced optician are in excessive supply. The excessive supply of optician can contribute towards worsening working conditions and lower job satisfaction of an optician. Therefore this can result infrequent turn over of jobs within the same field and migration into the different field of areas. To solve these problems, we will need to act with the manpower policy of government by gathering the voices of the related optician agencies. Then expansion of job domain, improvement of quality level, the improvement of the working conditions for optician can be accomplished by the unification of university system and reduction of entrance numbers for department of ophthalmic optics.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.26 no.11
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• pp.1012-1019
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• 2015

This paper shows the acceleration of iterative physical optics(IPO) for radar cross section(RCS) by using two techniques effectively. For the analysis of the multiple reflection in the cavity, IPO uses the near field method, unlike shooting and bouncing rays method which uses the geometric optics(GO). However, it is still far slower than physical optics(PO) and it is needed to accelerate the speed of IPO for practical purpose. In order to address this problem, graphic processing unit(GPU) can be applied to reduce calculation time and adaptive iterative physical optics-change rate(AIPO-CR) method is also applicable effectively to optimize iteration for acceleration of calculation.

• Korean Journal of Optics and Photonics
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• v.19 no.2
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• pp.116-121
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• 2008

A two dimensional point light source array can replace both the viewing zone forming optics and the back light panel in the contact-type 3 dimensional imaging systems based on LC panels. This replacement can make the system structure of the 3 dimensional imaging systems no different from that of the conventional LCD and can reduce undesirable visual effects caused by the viewing zone forming optics. The problem with the point light source array is the visual quality deterioration of the system due to the non-ideal nature of the array.

• Journal of Korean Ophthalmic Optics Society
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• v.9 no.1
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• pp.43-51
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• 2004

The purpose of this study was to investigate the present business management strategy of optician's stores for their improvement and development so that they directly related to consumers in the sale channel of eyeglasses are retailing business. For this purpose, it attempted to investigate the present state and business management problem of optical stores in korea. We wish to present problem and improvement direction on optician's stores condition and administration management, and show useful operation method in optician's stores.

• Korean Journal of Optics and Photonics
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• v.28 no.5
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• pp.187-193
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• 2017

The purpose of this study was to investigate some implications for optics education and improvement of the Examination for Appointing Secondary School Physics Teachers (EASSPT), by analyzing the problems in EASSPT. For these purpose, we analyzed 38 optics problems of the EASSPT from the 16 school years of 2002 to 2017. The results of the analysis are as follows: First, optics problems were presented in 10.8% of the physics subject area, which was least frequently. Second, many problems have addressed specific areas such as Snell's law, image of a single lens, or interference. Few problems were found in many other evaluation areas, including optical instruments and aberrations. Third, compared to other areas, optics problems were presented as relatively easy questions, and the problems were presented in more laboratory contexts than daily-life contexts. In addition, we have discussed implications for EASSPT and in-service physics-teacher training.

• Laser Solutions
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• v.17 no.1
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• pp.17-21
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• 2014

Head up display is in increasing demand for advanced devices in the modern luxury vehicles. It helps drivers focus on driving environment on the road. While HUD technology with LED has advanced, the brightness in daylight can be still an issue to be resolved. Laser light source is a possible solution to overcome the brightness problem and optimal optics design is required for the best performance. Sample design of optics is proposed and detail procedure of lens design evaluation is presented in this paper. The results were characterized by using a ray tracing method and qualitative analysis for spot and DEE is also presented. The overall error or image distortion remained in the target range of $25{\mu}m$ and the simulated image demonstrated possible use in the automotive applications.

• Current Optics and Photonics
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• v.3 no.5
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• pp.451-457
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• 2019

Laser processing using holograms can greatly improve processing speed, by spatially distributing the laser energy on the target material. However, it is difficult to reconstruct an image with arrays of closely spaced spots for laser processing, because the specklelike interference pattern prevents the spots from getting close to each other. To resolve this problem, a line target was divided in two, reconstructed with orthogonally polarized beams, and then superposed. Their optical reconstruction was performed by computer-generated holograms and a pulsed laser. With this method, we performed two-dimensional (2D) laser drilling of polyimide film, with a kerf width of $20{\mu}m$ and a total processing length of 20 mm.

• Journal of the Optical Society of Korea
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• v.16 no.4
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• pp.325-330
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• 2012

Differential absorption LIDAR (DIAL) is frequently used for atmospheric gas monitoring to detect impurities such as nitrogen dioxide, sulfur dioxide, iodine, and ozone. However, large differences in the on- and off-line laser wavelengths can cause serious errors owing to differential aerosol scattering. To resolve this problem, we have developed a new DIAL system for iodine vapor measurements in particular. The suggested DIAL system uses only one laser under seeded and unseeded conditions. To check the detection-sensitivity and error effects, we compared the results from a system using two seeded lasers with those from a system using a seeded and an unseeded laser. We demonstrate that the iodine concentration sensitivity of our system is improved in comparison to the conventional two seeded or two unseeded laser combinations.

• Journal of Korean Ophthalmic Optics Society
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• v.12 no.3
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• pp.143-149
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• 2007

We have compared and analyzed the definition of medical devices, classification, who treats, controls and sales the spectacle frames in South Korea, USA and European Union in this paper. South Korea classifies the spectacle frames as an industrial products while EU and USA regards it them as the medical devices. Sunglasses are industrial products in South Korea and EU but they are still the medical devices in USA. Assignment of spectacle frames and sunglasses as an industrial products could bring into several problems. Restricted classification of medical devices on spectacle frames and sunglasses will resolve the problem mentioned.

• International Journal of Naval Architecture and Ocean Engineering
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• v.4 no.1
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• pp.20-32
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• 2012

A software system for a complex object scattering analysis, named SYSCOS, has been developed for a systematic radar cross section (RCS) analysis and reduction design. The system is based on the high frequency analysis methods of physical optics, geometrical optics, and physical theory of diffraction, which are suitable for RCS analysis of electromagnetically large and complex targets as like naval ships. In addition, a direct scattering center analysis function has been included, which gives relatively simple and intuitive way to discriminate problem areas in design stage when comparing with conventional image-based approaches. In this paper, the theoretical background and the organization of the SYSCOS system are presented. To verify its accuracy and to demonstrate its applicability, numerical analyses for a square plate, a sphere and a cylinder, a weapon system and a virtual naval ship have been carried out, of which results have been compared with analytic solutions and those obtained by the other existing software.