• 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 Industrial Convergence
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• v.17 no.4
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• pp.69-75
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• 2019

In this study, we developed a world map learning system for elementary education that uses Google Cloud platform STT, Dialog Flow, and fan holograms to recognize the voices of learners and to show and explain three-dimensional images of suitable results as holograms. As a result of the experiments and interviews, it is expected to be helpful for improving the learning effect by inducing students' interest and immersion and is expected to be effectively used for collaborative learning and education for students with disabilities.

• Journal of Korea Multimedia Society
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• v.18 no.2
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• pp.260-267
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• 2015

The Ministry of Culture, Sports and Tourism has been implementing the 'Local Government 3D Contents Production Support Project' since 2010 to foster the 3D contents industry and secure high-quality 3D contents of local governments. This is part of national support for securing 3D media contents of local governments. In particular, stereo-scopic 3D animation is in the spotlight as media contents appropriate for simultaneous implementation of pleasure of narrative and high-level of presence to promote tourism resources of local governments. But existing stereo-scopic 3D animation-related studies are mostly concentrated in three dimensional effect expression for particular scenes or theater. Therefore, this study extracted elements required for storytelling planning by analyzing production cases of stereo-scopic 3D animation using tourism resources of local governments which have been recognized for a high quality of work.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2018.06a
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• pp.34-34
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• 2018

레이저를 통한 플라스틱 일체형 회로형성 기술은 레이저 직접 성형 (Laser Direct Structuring, LDS) 기술과 도금기술을 이용하여 기판 표면에 전도성 회로 패턴을 형성하고 소자를 집적하여 부품을 제작하는 기술이다. 종래에는 PCB 기반의 평면기판을 기반으로 하여 제작된 소자와 부품이 전자제품의 주를 이루었으나, 최근 소자의 집적화와 제품 디자인의 유연화(flexible)로 굽힘(bendable) 형태의 스마트 시계와 같은 웨어러블(wearable) 전자 제품이 출시되었으며, 레이저를 통한 플라스틱 일체형 회로형성 기술은 미래 사회의 주를 이룰 웨어러블 형태의 제품의 상용화를 가능하게 할 뿐만 아니라 회로 집적이 가능하여 제품 혁신을 주도할 기술로 주목 받고 있다. 본 연구에서는 LDS 부품의 미세 회로 구현을 위한 공정 기술 개발에 있어서 고생산성 무전해 동도금액 및 부품 실장을 위한 표면처리 기술 개발에 대한 결과를 보고한다. 미세 회로 패터닝 기술의 상용화를 위해서는 도금액의 안정성뿐만 아니라 고속 공정기술이 필요하다, 현재 국내 무전해 동 도금의 석출 속도는 시간 당 $4{\sim}5{\mu}m$ 내외이기 때문에, 생산성을 향상시키기 위해서는 시간 당 $10{\mu}m$ 정도의 고속 무전해 동 도금 공정 개발 필요하다.

• KSBB Journal
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• v.17 no.4
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• pp.321-325
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• 2002

Chiral epoxides are valuable intermediates for the asymmetric synthesis of enantiopure bioactive compounds. Microbial epoxide hydrolases (EHs) are newly discovered enzymes and versatile biocatalysts for the preparation of chiral epoxides by enantioselective hydrolysis of cheap and easily available racemic epoxide substrates. EHs are commercially potential biocatalysts due to their characteristics such as high enantioselectivity, cofactor-independent catalysis, and easy-to-Prepare catalysts. In this Paper, recent progresses in biochemistry and molecular biology of EH and developments of novel reaction systems are reviewed to evaluate the commercial feasibility of EH-catalyzed hydrolytic kinetic resolution for the production of chiral epoxides.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.42 no.4 s.304
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• pp.1-10
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• 2005

This paper presents a map matching method using multiple hypothesis technique(MHT) to identify the road that a land vehicle is located on. To realize a map matching method using MHT, Pseudo-measurements are generated utilizing adjacent roads of GPS/DR position and the MHT is reformulated as a single target problem. Since pseudo-measurements are generated using digital map, topological properties such as road connection, direction, and road facility information are considered in calculating probabilities of hypotheses. In order to improve the map matching performance under when bias errors exist in digital road map data, a Kalman filter is employed to estimate the biases. Field experimental results show that the proposed map matching method provides the consistent performance even in complex downtown areas, overpass/underpass areas, and in the areas where roads are adjacent in parallel.

• Journal of the Korean Society for Precision Engineering
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• v.21 no.11
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• pp.163-170
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• 2004

In order to produce high-quality optical components, aspheric lenses have been widely applied in recent years. An aspheric lens consists of aspheric surfaces instead of spherical ones, which causes difficulty in the design process as well as the manufacturing procedure. Although injection molding is widely used to fabricate optical lenses owing to its high productivity, there remains lots of difficulty to determine appropriate mold design factors and injection molding parameters. In the injection molding fields, computer simulation has been effectively applied to analyze processes based on the shell analysis so far. Considering the geometry of optical lenses, however, numerical analysis based on solid elements has been reported as more reliable approach than shell -based one. The present work covers three-dimensional injection molding simulation using MP1/Flow3D and relevant deformation analysis of an injection molded plastic lens based on solid elements. Numerical analysis has been applied to the injection molding processes of an aspheric lens for a photo pick-up device. The reliability of the proposed approach has been verified in comparison with the experiments.

• Applied Chemistry for Engineering
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• v.25 no.3
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• pp.249-253
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• 2014

Palladium on carbon catalysts for hexafluoropropylene hydrogenation were prepared using imidazolium hexafluorophosphate with various cation parts. The morphology of palladium was relatively affected by the cation parts of the ionic liquid. With increasing alkyl chains of the ionic liquid cation, the shape of palladium particle changed from spherical to cylindrical due to the effect of steric stabilization. After calcination at $500^{\circ}C$, all catalysts possessed the comparable crystal structure. Under the identical reaction conditions, the catalyst prepared using the ionic liquid with hexyl chain in cation parts showed the most effective reactivity.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2022.05a
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• pp.44-46
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• 2022

Various object recognition using artificial intelligence basically shows planar results. It is based on classifying objects or identifying what objects are on the image. However, the original object has a three-dimensional shape, not a plane, and although the perception to obtain only simple results from the image does not matter, there is a lot of information that is insufficient when used in various fields. In this paper, checks the method of generating data in various fields of objects and whether it is meaningful by utilizing the characteristics of Layer that generates intermediate results with respect to image generation based on the GAN algorithm. It solves some of the problems in the hardware and collection process for generating existing multi-faceted data, and confirms that it can be utilized after data generation on several limited objects.

• Journal of Korean Ophthalmic Optics Society
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• v.15 no.2
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• pp.161-167
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• 2010

Purpose: The aim of this study was to help the rapid and effective eye-tests of old patients by developing an optometric questionnaire for the elderly suitable for optical shops in Korea. Methods: We surveyed several previous studies about the age-related changes of the eye, and deduced 10 items which were appropriate for optometric eye-tests. Excluding the items that could be easily found in a routine eye-test and that was just physiological changes, we principally chose anomaly items which could be catched by simple oral questions. The questionnaire was mainly composed of clinically important items that were frequently observed. Results: To diagnose optometric symptoms related to eye-aging, we listed 15 questions on the questionnaire for the elderly. Each of the 15 questions was respectively about the decline in the amplitude of accommodation (no.1), anisometropia (no.2), xerophthalmia (no.3), muscae volitantes (no.4-5), dark adaptation (no.6) light and dark adaptation (no.7), contrast sensitivity (no.8), contrast sensitivity and anisometropia (no.9), contrast sensitivity and colour vision (no.10), the field of view (no.11), stereoscopic vision (no.12), colour vision (no.13), cataract (no.14), and presbyopia (no.15). Each question was easy to understand and related to the generally observed symptoms. Conclusions: Our optometric questionnaire for the elderly, which was developed by the procedure mentioned above, was expected to be a help for examining the aging eye and offer the basis of eye-tests of older patients in Korean optical shops.